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Message-ID: <56BF3767.2050206@kernel.org>
Date: Sat, 13 Feb 2016 14:02:15 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: Ksenija Stanojevic <ksenija.stanojevic@...il.com>,
gregkh@...uxfoundation.org
Cc: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
devel@...verdev.osuosl.org, knaack.h@....de, lars@...afoo.de,
pmeerw@...erw.net
Subject: Re: [PATCH] iio: adc: Move mxs-lradc out of staging
On 06/02/16 22:23, Ksenija Stanojevic wrote:
> Move mxs-lradc driver from drivers/staging/iio/adc to drivers/iio/adc.
>
> Signed-off-by: Ksenija Stanojevic <ksenija.stanojevic@...il.com>
That's odd. I was sure I sent a reply to this the other day to say I'd
applied it (with IIRC one trivial whitespace change) but I can't find
any record of that email locally or in the archives online.
My battery ran out so perhaps it didn't quite send before that.
Anyhow, applied to the togreg branch of iio.git - pushed out as testing
for the autobuilders to play with it.
Thanks,
Jonathan
> ---
> drivers/iio/adc/Kconfig | 14 +
> drivers/iio/adc/Makefile | 1 +
> drivers/iio/adc/mxs-lradc.c | 1770 +++++++++++++++++++++++++++++++++++
> drivers/staging/iio/adc/Kconfig | 14 -
> drivers/staging/iio/adc/Makefile | 1 -
> drivers/staging/iio/adc/mxs-lradc.c | 1770 -----------------------------------
> 6 files changed, 1785 insertions(+), 1785 deletions(-)
> create mode 100644 drivers/iio/adc/mxs-lradc.c
> delete mode 100644 drivers/staging/iio/adc/mxs-lradc.c
>
> diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
> index 60673b4..4900b0a 100644
> --- a/drivers/iio/adc/Kconfig
> +++ b/drivers/iio/adc/Kconfig
> @@ -295,6 +295,20 @@ config MEN_Z188_ADC
> This driver can also be built as a module. If so, the module will be
> called men_z188_adc.
>
> +config MXS_LRADC
> + tristate "Freescale i.MX23/i.MX28 LRADC"
> + depends on (ARCH_MXS || COMPILE_TEST) && HAS_IOMEM
> + depends on INPUT
> + select STMP_DEVICE
> + select IIO_BUFFER
> + select IIO_TRIGGERED_BUFFER
> + help
> + Say yes here to build support for i.MX23/i.MX28 LRADC convertor
> + built into these chips.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called mxs-lradc.
> +
> config NAU7802
> tristate "Nuvoton NAU7802 ADC driver"
> depends on I2C
> diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
> index fb57e12..3b14f30 100644
> --- a/drivers/iio/adc/Makefile
> +++ b/drivers/iio/adc/Makefile
> @@ -29,6 +29,7 @@ obj-$(CONFIG_MAX1363) += max1363.o
> obj-$(CONFIG_MCP320X) += mcp320x.o
> obj-$(CONFIG_MCP3422) += mcp3422.o
> obj-$(CONFIG_MEN_Z188_ADC) += men_z188_adc.o
> +obj-$(CONFIG_MXS_LRADC) += mxs-lradc.o
> obj-$(CONFIG_NAU7802) += nau7802.o
> obj-$(CONFIG_PALMAS_GPADC) += palmas_gpadc.o
> obj-$(CONFIG_QCOM_SPMI_IADC) += qcom-spmi-iadc.o
> diff --git a/drivers/iio/adc/mxs-lradc.c b/drivers/iio/adc/mxs-lradc.c
> new file mode 100644
> index 0000000..bb1f152
> --- /dev/null
> +++ b/drivers/iio/adc/mxs-lradc.c
> @@ -0,0 +1,1770 @@
> +/*
> + * Freescale MXS LRADC driver
> + *
> + * Copyright (c) 2012 DENX Software Engineering, GmbH.
> + * Marek Vasut <marex@...x.de>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/bitops.h>
> +#include <linux/clk.h>
> +#include <linux/completion.h>
> +#include <linux/device.h>
> +#include <linux/err.h>
> +#include <linux/input.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/slab.h>
> +#include <linux/stmp_device.h>
> +#include <linux/sysfs.h>
> +
> +#include <linux/iio/buffer.h>
> +#include <linux/iio/iio.h>
> +#include <linux/iio/trigger.h>
> +#include <linux/iio/trigger_consumer.h>
> +#include <linux/iio/triggered_buffer.h>
> +#include <linux/iio/sysfs.h>
> +
> +#define DRIVER_NAME "mxs-lradc"
> +
> +#define LRADC_MAX_DELAY_CHANS 4
> +#define LRADC_MAX_MAPPED_CHANS 8
> +#define LRADC_MAX_TOTAL_CHANS 16
> +
> +#define LRADC_DELAY_TIMER_HZ 2000
> +
> +/*
> + * Make this runtime configurable if necessary. Currently, if the buffered mode
> + * is enabled, the LRADC takes LRADC_DELAY_TIMER_LOOP samples of data before
> + * triggering IRQ. The sampling happens every (LRADC_DELAY_TIMER_PER / 2000)
> + * seconds. The result is that the samples arrive every 500mS.
> + */
> +#define LRADC_DELAY_TIMER_PER 200
> +#define LRADC_DELAY_TIMER_LOOP 5
> +
> +/*
> + * Once the pen touches the touchscreen, the touchscreen switches from
> + * IRQ-driven mode to polling mode to prevent interrupt storm. The polling
> + * is realized by worker thread, which is called every 20 or so milliseconds.
> + * This gives the touchscreen enough fluency and does not strain the system
> + * too much.
> + */
> +#define LRADC_TS_SAMPLE_DELAY_MS 5
> +
> +/*
> + * The LRADC reads the following amount of samples from each touchscreen
> + * channel and the driver then computes average of these.
> + */
> +#define LRADC_TS_SAMPLE_AMOUNT 4
> +
> +enum mxs_lradc_id {
> + IMX23_LRADC,
> + IMX28_LRADC,
> +};
> +
> +static const char * const mx23_lradc_irq_names[] = {
> + "mxs-lradc-touchscreen",
> + "mxs-lradc-channel0",
> + "mxs-lradc-channel1",
> + "mxs-lradc-channel2",
> + "mxs-lradc-channel3",
> + "mxs-lradc-channel4",
> + "mxs-lradc-channel5",
> + "mxs-lradc-channel6",
> + "mxs-lradc-channel7",
> +};
> +
> +static const char * const mx28_lradc_irq_names[] = {
> + "mxs-lradc-touchscreen",
> + "mxs-lradc-thresh0",
> + "mxs-lradc-thresh1",
> + "mxs-lradc-channel0",
> + "mxs-lradc-channel1",
> + "mxs-lradc-channel2",
> + "mxs-lradc-channel3",
> + "mxs-lradc-channel4",
> + "mxs-lradc-channel5",
> + "mxs-lradc-channel6",
> + "mxs-lradc-channel7",
> + "mxs-lradc-button0",
> + "mxs-lradc-button1",
> +};
> +
> +struct mxs_lradc_of_config {
> + const int irq_count;
> + const char * const *irq_name;
> + const u32 *vref_mv;
> +};
> +
> +#define VREF_MV_BASE 1850
> +
> +static const u32 mx23_vref_mv[LRADC_MAX_TOTAL_CHANS] = {
> + VREF_MV_BASE, /* CH0 */
> + VREF_MV_BASE, /* CH1 */
> + VREF_MV_BASE, /* CH2 */
> + VREF_MV_BASE, /* CH3 */
> + VREF_MV_BASE, /* CH4 */
> + VREF_MV_BASE, /* CH5 */
> + VREF_MV_BASE * 2, /* CH6 VDDIO */
> + VREF_MV_BASE * 4, /* CH7 VBATT */
> + VREF_MV_BASE, /* CH8 Temp sense 0 */
> + VREF_MV_BASE, /* CH9 Temp sense 1 */
> + VREF_MV_BASE, /* CH10 */
> + VREF_MV_BASE, /* CH11 */
> + VREF_MV_BASE, /* CH12 USB_DP */
> + VREF_MV_BASE, /* CH13 USB_DN */
> + VREF_MV_BASE, /* CH14 VBG */
> + VREF_MV_BASE * 4, /* CH15 VDD5V */
> +};
> +
> +static const u32 mx28_vref_mv[LRADC_MAX_TOTAL_CHANS] = {
> + VREF_MV_BASE, /* CH0 */
> + VREF_MV_BASE, /* CH1 */
> + VREF_MV_BASE, /* CH2 */
> + VREF_MV_BASE, /* CH3 */
> + VREF_MV_BASE, /* CH4 */
> + VREF_MV_BASE, /* CH5 */
> + VREF_MV_BASE, /* CH6 */
> + VREF_MV_BASE * 4, /* CH7 VBATT */
> + VREF_MV_BASE, /* CH8 Temp sense 0 */
> + VREF_MV_BASE, /* CH9 Temp sense 1 */
> + VREF_MV_BASE * 2, /* CH10 VDDIO */
> + VREF_MV_BASE, /* CH11 VTH */
> + VREF_MV_BASE * 2, /* CH12 VDDA */
> + VREF_MV_BASE, /* CH13 VDDD */
> + VREF_MV_BASE, /* CH14 VBG */
> + VREF_MV_BASE * 4, /* CH15 VDD5V */
> +};
> +
> +static const struct mxs_lradc_of_config mxs_lradc_of_config[] = {
> + [IMX23_LRADC] = {
> + .irq_count = ARRAY_SIZE(mx23_lradc_irq_names),
> + .irq_name = mx23_lradc_irq_names,
> + .vref_mv = mx23_vref_mv,
> + },
> + [IMX28_LRADC] = {
> + .irq_count = ARRAY_SIZE(mx28_lradc_irq_names),
> + .irq_name = mx28_lradc_irq_names,
> + .vref_mv = mx28_vref_mv,
> + },
> +};
> +
> +enum mxs_lradc_ts {
> + MXS_LRADC_TOUCHSCREEN_NONE = 0,
> + MXS_LRADC_TOUCHSCREEN_4WIRE,
> + MXS_LRADC_TOUCHSCREEN_5WIRE,
> +};
> +
> +/*
> + * Touchscreen handling
> + */
> +enum lradc_ts_plate {
> + LRADC_TOUCH = 0,
> + LRADC_SAMPLE_X,
> + LRADC_SAMPLE_Y,
> + LRADC_SAMPLE_PRESSURE,
> + LRADC_SAMPLE_VALID,
> +};
> +
> +enum mxs_lradc_divbytwo {
> + MXS_LRADC_DIV_DISABLED = 0,
> + MXS_LRADC_DIV_ENABLED,
> +};
> +
> +struct mxs_lradc_scale {
> + unsigned int integer;
> + unsigned int nano;
> +};
> +
> +struct mxs_lradc {
> + struct device *dev;
> + void __iomem *base;
> + int irq[13];
> +
> + struct clk *clk;
> +
> + u32 *buffer;
> + struct iio_trigger *trig;
> +
> + struct mutex lock;
> +
> + struct completion completion;
> +
> + const u32 *vref_mv;
> + struct mxs_lradc_scale scale_avail[LRADC_MAX_TOTAL_CHANS][2];
> + unsigned long is_divided;
> +
> + /*
> + * When the touchscreen is enabled, we give it two private virtual
> + * channels: #6 and #7. This means that only 6 virtual channels (instead
> + * of 8) will be available for buffered capture.
> + */
> +#define TOUCHSCREEN_VCHANNEL1 7
> +#define TOUCHSCREEN_VCHANNEL2 6
> +#define BUFFER_VCHANS_LIMITED 0x3f
> +#define BUFFER_VCHANS_ALL 0xff
> + u8 buffer_vchans;
> +
> + /*
> + * Furthermore, certain LRADC channels are shared between touchscreen
> + * and/or touch-buttons and generic LRADC block. Therefore when using
> + * either of these, these channels are not available for the regular
> + * sampling. The shared channels are as follows:
> + *
> + * CH0 -- Touch button #0
> + * CH1 -- Touch button #1
> + * CH2 -- Touch screen XPUL
> + * CH3 -- Touch screen YPLL
> + * CH4 -- Touch screen XNUL
> + * CH5 -- Touch screen YNLR
> + * CH6 -- Touch screen WIPER (5-wire only)
> + *
> + * The bit fields below represents which parts of the LRADC block are
> + * switched into special mode of operation. These channels can not
> + * be sampled as regular LRADC channels. The driver will refuse any
> + * attempt to sample these channels.
> + */
> +#define CHAN_MASK_TOUCHBUTTON (BIT(1) | BIT(0))
> +#define CHAN_MASK_TOUCHSCREEN_4WIRE (0xf << 2)
> +#define CHAN_MASK_TOUCHSCREEN_5WIRE (0x1f << 2)
> + enum mxs_lradc_ts use_touchscreen;
> + bool use_touchbutton;
> +
> + struct input_dev *ts_input;
> +
> + enum mxs_lradc_id soc;
> + enum lradc_ts_plate cur_plate; /* state machine */
> + bool ts_valid;
> + unsigned ts_x_pos;
> + unsigned ts_y_pos;
> + unsigned ts_pressure;
> +
> + /* handle touchscreen's physical behaviour */
> + /* samples per coordinate */
> + unsigned over_sample_cnt;
> + /* time clocks between samples */
> + unsigned over_sample_delay;
> + /* time in clocks to wait after the plates where switched */
> + unsigned settling_delay;
> +};
> +
> +#define LRADC_CTRL0 0x00
> +# define LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE BIT(23)
> +# define LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE BIT(22)
> +# define LRADC_CTRL0_MX28_YNNSW /* YM */ BIT(21)
> +# define LRADC_CTRL0_MX28_YPNSW /* YP */ BIT(20)
> +# define LRADC_CTRL0_MX28_YPPSW /* YP */ BIT(19)
> +# define LRADC_CTRL0_MX28_XNNSW /* XM */ BIT(18)
> +# define LRADC_CTRL0_MX28_XNPSW /* XM */ BIT(17)
> +# define LRADC_CTRL0_MX28_XPPSW /* XP */ BIT(16)
> +
> +# define LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE BIT(20)
> +# define LRADC_CTRL0_MX23_YM BIT(19)
> +# define LRADC_CTRL0_MX23_XM BIT(18)
> +# define LRADC_CTRL0_MX23_YP BIT(17)
> +# define LRADC_CTRL0_MX23_XP BIT(16)
> +
> +# define LRADC_CTRL0_MX28_PLATE_MASK \
> + (LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE | \
> + LRADC_CTRL0_MX28_YNNSW | LRADC_CTRL0_MX28_YPNSW | \
> + LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_XNNSW | \
> + LRADC_CTRL0_MX28_XNPSW | LRADC_CTRL0_MX28_XPPSW)
> +
> +# define LRADC_CTRL0_MX23_PLATE_MASK \
> + (LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE | \
> + LRADC_CTRL0_MX23_YM | LRADC_CTRL0_MX23_XM | \
> + LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_XP)
> +
> +#define LRADC_CTRL1 0x10
> +#define LRADC_CTRL1_TOUCH_DETECT_IRQ_EN BIT(24)
> +#define LRADC_CTRL1_LRADC_IRQ_EN(n) (1 << ((n) + 16))
> +#define LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK (0x1fff << 16)
> +#define LRADC_CTRL1_MX23_LRADC_IRQ_EN_MASK (0x01ff << 16)
> +#define LRADC_CTRL1_LRADC_IRQ_EN_OFFSET 16
> +#define LRADC_CTRL1_TOUCH_DETECT_IRQ BIT(8)
> +#define LRADC_CTRL1_LRADC_IRQ(n) (1 << (n))
> +#define LRADC_CTRL1_MX28_LRADC_IRQ_MASK 0x1fff
> +#define LRADC_CTRL1_MX23_LRADC_IRQ_MASK 0x01ff
> +#define LRADC_CTRL1_LRADC_IRQ_OFFSET 0
> +
> +#define LRADC_CTRL2 0x20
> +#define LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET 24
> +#define LRADC_CTRL2_TEMPSENSE_PWD BIT(15)
> +
> +#define LRADC_STATUS 0x40
> +#define LRADC_STATUS_TOUCH_DETECT_RAW BIT(0)
> +
> +#define LRADC_CH(n) (0x50 + (0x10 * (n)))
> +#define LRADC_CH_ACCUMULATE BIT(29)
> +#define LRADC_CH_NUM_SAMPLES_MASK (0x1f << 24)
> +#define LRADC_CH_NUM_SAMPLES_OFFSET 24
> +#define LRADC_CH_NUM_SAMPLES(x) \
> + ((x) << LRADC_CH_NUM_SAMPLES_OFFSET)
> +#define LRADC_CH_VALUE_MASK 0x3ffff
> +#define LRADC_CH_VALUE_OFFSET 0
> +
> +#define LRADC_DELAY(n) (0xd0 + (0x10 * (n)))
> +#define LRADC_DELAY_TRIGGER_LRADCS_MASK (0xffUL << 24)
> +#define LRADC_DELAY_TRIGGER_LRADCS_OFFSET 24
> +#define LRADC_DELAY_TRIGGER(x) \
> + (((x) << LRADC_DELAY_TRIGGER_LRADCS_OFFSET) & \
> + LRADC_DELAY_TRIGGER_LRADCS_MASK)
> +#define LRADC_DELAY_KICK BIT(20)
> +#define LRADC_DELAY_TRIGGER_DELAYS_MASK (0xf << 16)
> +#define LRADC_DELAY_TRIGGER_DELAYS_OFFSET 16
> +#define LRADC_DELAY_TRIGGER_DELAYS(x) \
> + (((x) << LRADC_DELAY_TRIGGER_DELAYS_OFFSET) & \
> + LRADC_DELAY_TRIGGER_DELAYS_MASK)
> +#define LRADC_DELAY_LOOP_COUNT_MASK (0x1f << 11)
> +#define LRADC_DELAY_LOOP_COUNT_OFFSET 11
> +#define LRADC_DELAY_LOOP(x) \
> + (((x) << LRADC_DELAY_LOOP_COUNT_OFFSET) & \
> + LRADC_DELAY_LOOP_COUNT_MASK)
> +#define LRADC_DELAY_DELAY_MASK 0x7ff
> +#define LRADC_DELAY_DELAY_OFFSET 0
> +#define LRADC_DELAY_DELAY(x) \
> + (((x) << LRADC_DELAY_DELAY_OFFSET) & \
> + LRADC_DELAY_DELAY_MASK)
> +
> +#define LRADC_CTRL4 0x140
> +#define LRADC_CTRL4_LRADCSELECT_MASK(n) (0xf << ((n) * 4))
> +#define LRADC_CTRL4_LRADCSELECT_OFFSET(n) ((n) * 4)
> +#define LRADC_CTRL4_LRADCSELECT(n, x) \
> + (((x) << LRADC_CTRL4_LRADCSELECT_OFFSET(n)) & \
> + LRADC_CTRL4_LRADCSELECT_MASK(n))
> +
> +#define LRADC_RESOLUTION 12
> +#define LRADC_SINGLE_SAMPLE_MASK ((1 << LRADC_RESOLUTION) - 1)
> +
> +static void mxs_lradc_reg_set(struct mxs_lradc *lradc, u32 val, u32 reg)
> +{
> + writel(val, lradc->base + reg + STMP_OFFSET_REG_SET);
> +}
> +
> +static void mxs_lradc_reg_clear(struct mxs_lradc *lradc, u32 val, u32 reg)
> +{
> + writel(val, lradc->base + reg + STMP_OFFSET_REG_CLR);
> +}
> +
> +static void mxs_lradc_reg_wrt(struct mxs_lradc *lradc, u32 val, u32 reg)
> +{
> + writel(val, lradc->base + reg);
> +}
> +
> +static u32 mxs_lradc_plate_mask(struct mxs_lradc *lradc)
> +{
> + if (lradc->soc == IMX23_LRADC)
> + return LRADC_CTRL0_MX23_PLATE_MASK;
> + return LRADC_CTRL0_MX28_PLATE_MASK;
> +}
> +
> +static u32 mxs_lradc_irq_en_mask(struct mxs_lradc *lradc)
> +{
> + if (lradc->soc == IMX23_LRADC)
> + return LRADC_CTRL1_MX23_LRADC_IRQ_EN_MASK;
> + return LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK;
> +}
> +
> +static u32 mxs_lradc_irq_mask(struct mxs_lradc *lradc)
> +{
> + if (lradc->soc == IMX23_LRADC)
> + return LRADC_CTRL1_MX23_LRADC_IRQ_MASK;
> + return LRADC_CTRL1_MX28_LRADC_IRQ_MASK;
> +}
> +
> +static u32 mxs_lradc_touch_detect_bit(struct mxs_lradc *lradc)
> +{
> + if (lradc->soc == IMX23_LRADC)
> + return LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE;
> + return LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE;
> +}
> +
> +static u32 mxs_lradc_drive_x_plate(struct mxs_lradc *lradc)
> +{
> + if (lradc->soc == IMX23_LRADC)
> + return LRADC_CTRL0_MX23_XP | LRADC_CTRL0_MX23_XM;
> + return LRADC_CTRL0_MX28_XPPSW | LRADC_CTRL0_MX28_XNNSW;
> +}
> +
> +static u32 mxs_lradc_drive_y_plate(struct mxs_lradc *lradc)
> +{
> + if (lradc->soc == IMX23_LRADC)
> + return LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_YM;
> + return LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_YNNSW;
> +}
> +
> +static u32 mxs_lradc_drive_pressure(struct mxs_lradc *lradc)
> +{
> + if (lradc->soc == IMX23_LRADC)
> + return LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_XM;
> + return LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_XNNSW;
> +}
> +
> +static bool mxs_lradc_check_touch_event(struct mxs_lradc *lradc)
> +{
> + return !!(readl(lradc->base + LRADC_STATUS) &
> + LRADC_STATUS_TOUCH_DETECT_RAW);
> +}
> +
> +static void mxs_lradc_map_channel(struct mxs_lradc *lradc, unsigned vch,
> + unsigned ch)
> +{
> + mxs_lradc_reg_clear(lradc, LRADC_CTRL4_LRADCSELECT_MASK(vch),
> + LRADC_CTRL4);
> + mxs_lradc_reg_set(lradc, LRADC_CTRL4_LRADCSELECT(vch, ch), LRADC_CTRL4);
> +}
> +
> +static void mxs_lradc_setup_ts_channel(struct mxs_lradc *lradc, unsigned ch)
> +{
> + /*
> + * prepare for oversampling conversion
> + *
> + * from the datasheet:
> + * "The ACCUMULATE bit in the appropriate channel register
> + * HW_LRADC_CHn must be set to 1 if NUM_SAMPLES is greater then 0;
> + * otherwise, the IRQs will not fire."
> + */
> + mxs_lradc_reg_wrt(lradc, LRADC_CH_ACCUMULATE |
> + LRADC_CH_NUM_SAMPLES(lradc->over_sample_cnt - 1),
> + LRADC_CH(ch));
> +
> + /* from the datasheet:
> + * "Software must clear this register in preparation for a
> + * multi-cycle accumulation.
> + */
> + mxs_lradc_reg_clear(lradc, LRADC_CH_VALUE_MASK, LRADC_CH(ch));
> +
> + /*
> + * prepare the delay/loop unit according to the oversampling count
> + *
> + * from the datasheet:
> + * "The DELAY fields in HW_LRADC_DELAY0, HW_LRADC_DELAY1,
> + * HW_LRADC_DELAY2, and HW_LRADC_DELAY3 must be non-zero; otherwise,
> + * the LRADC will not trigger the delay group."
> + */
> + mxs_lradc_reg_wrt(lradc, LRADC_DELAY_TRIGGER(1 << ch) |
> + LRADC_DELAY_TRIGGER_DELAYS(0) |
> + LRADC_DELAY_LOOP(lradc->over_sample_cnt - 1) |
> + LRADC_DELAY_DELAY(lradc->over_sample_delay - 1),
> + LRADC_DELAY(3));
> +
> + mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ(ch), LRADC_CTRL1);
> +
> + /*
> + * after changing the touchscreen plates setting
> + * the signals need some initial time to settle. Start the
> + * SoC's delay unit and start the conversion later
> + * and automatically.
> + */
> + mxs_lradc_reg_wrt(
> + lradc,
> + LRADC_DELAY_TRIGGER(0) | /* don't trigger ADC */
> + LRADC_DELAY_TRIGGER_DELAYS(BIT(3)) | /* trigger DELAY unit#3 */
> + LRADC_DELAY_KICK |
> + LRADC_DELAY_DELAY(lradc->settling_delay),
> + LRADC_DELAY(2));
> +}
> +
> +/*
> + * Pressure detection is special:
> + * We want to do both required measurements for the pressure detection in
> + * one turn. Use the hardware features to chain both conversions and let the
> + * hardware report one interrupt if both conversions are done
> + */
> +static void mxs_lradc_setup_ts_pressure(struct mxs_lradc *lradc, unsigned ch1,
> + unsigned ch2)
> +{
> + u32 reg;
> +
> + /*
> + * prepare for oversampling conversion
> + *
> + * from the datasheet:
> + * "The ACCUMULATE bit in the appropriate channel register
> + * HW_LRADC_CHn must be set to 1 if NUM_SAMPLES is greater then 0;
> + * otherwise, the IRQs will not fire."
> + */
> + reg = LRADC_CH_ACCUMULATE |
> + LRADC_CH_NUM_SAMPLES(lradc->over_sample_cnt - 1);
> + mxs_lradc_reg_wrt(lradc, reg, LRADC_CH(ch1));
> + mxs_lradc_reg_wrt(lradc, reg, LRADC_CH(ch2));
> +
> + /* from the datasheet:
> + * "Software must clear this register in preparation for a
> + * multi-cycle accumulation.
> + */
> + mxs_lradc_reg_clear(lradc, LRADC_CH_VALUE_MASK, LRADC_CH(ch1));
> + mxs_lradc_reg_clear(lradc, LRADC_CH_VALUE_MASK, LRADC_CH(ch2));
> +
> + /* prepare the delay/loop unit according to the oversampling count */
> + mxs_lradc_reg_wrt(
> + lradc,
> + LRADC_DELAY_TRIGGER(1 << ch1) |
> + LRADC_DELAY_TRIGGER(1 << ch2) | /* start both channels */
> + LRADC_DELAY_TRIGGER_DELAYS(0) |
> + LRADC_DELAY_LOOP(lradc->over_sample_cnt - 1) |
> + LRADC_DELAY_DELAY(lradc->over_sample_delay - 1),
> + LRADC_DELAY(3));
> +
> + mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ(ch2), LRADC_CTRL1);
> +
> + /*
> + * after changing the touchscreen plates setting
> + * the signals need some initial time to settle. Start the
> + * SoC's delay unit and start the conversion later
> + * and automatically.
> + */
> + mxs_lradc_reg_wrt(
> + lradc,
> + LRADC_DELAY_TRIGGER(0) | /* don't trigger ADC */
> + LRADC_DELAY_TRIGGER_DELAYS(BIT(3)) | /* trigger DELAY unit#3 */
> + LRADC_DELAY_KICK |
> + LRADC_DELAY_DELAY(lradc->settling_delay), LRADC_DELAY(2));
> +}
> +
> +static unsigned mxs_lradc_read_raw_channel(struct mxs_lradc *lradc,
> + unsigned channel)
> +{
> + u32 reg;
> + unsigned num_samples, val;
> +
> + reg = readl(lradc->base + LRADC_CH(channel));
> + if (reg & LRADC_CH_ACCUMULATE)
> + num_samples = lradc->over_sample_cnt;
> + else
> + num_samples = 1;
> +
> + val = (reg & LRADC_CH_VALUE_MASK) >> LRADC_CH_VALUE_OFFSET;
> + return val / num_samples;
> +}
> +
> +static unsigned mxs_lradc_read_ts_pressure(struct mxs_lradc *lradc,
> + unsigned ch1, unsigned ch2)
> +{
> + u32 reg, mask;
> + unsigned pressure, m1, m2;
> +
> + mask = LRADC_CTRL1_LRADC_IRQ(ch1) | LRADC_CTRL1_LRADC_IRQ(ch2);
> + reg = readl(lradc->base + LRADC_CTRL1) & mask;
> +
> + while (reg != mask) {
> + reg = readl(lradc->base + LRADC_CTRL1) & mask;
> + dev_dbg(lradc->dev, "One channel is still busy: %X\n", reg);
> + }
> +
> + m1 = mxs_lradc_read_raw_channel(lradc, ch1);
> + m2 = mxs_lradc_read_raw_channel(lradc, ch2);
> +
> + if (m2 == 0) {
> + dev_warn(lradc->dev, "Cannot calculate pressure\n");
> + return 1 << (LRADC_RESOLUTION - 1);
> + }
> +
> + /* simply scale the value from 0 ... max ADC resolution */
> + pressure = m1;
> + pressure *= (1 << LRADC_RESOLUTION);
> + pressure /= m2;
> +
> + dev_dbg(lradc->dev, "Pressure = %u\n", pressure);
> + return pressure;
> +}
> +
> +#define TS_CH_XP 2
> +#define TS_CH_YP 3
> +#define TS_CH_XM 4
> +#define TS_CH_YM 5
> +
> +/*
> + * YP(open)--+-------------+
> + * | |--+
> + * | | |
> + * YM(-)--+-------------+ |
> + * +--------------+
> + * | |
> + * XP(weak+) XM(open)
> + *
> + * "weak+" means 200k Ohm VDDIO
> + * (-) means GND
> + */
> +static void mxs_lradc_setup_touch_detection(struct mxs_lradc *lradc)
> +{
> + /*
> + * In order to detect a touch event the 'touch detect enable' bit
> + * enables:
> + * - a weak pullup to the X+ connector
> + * - a strong ground at the Y- connector
> + */
> + mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0);
> + mxs_lradc_reg_set(lradc, mxs_lradc_touch_detect_bit(lradc),
> + LRADC_CTRL0);
> +}
> +
> +/*
> + * YP(meas)--+-------------+
> + * | |--+
> + * | | |
> + * YM(open)--+-------------+ |
> + * +--------------+
> + * | |
> + * XP(+) XM(-)
> + *
> + * (+) means here 1.85 V
> + * (-) means here GND
> + */
> +static void mxs_lradc_prepare_x_pos(struct mxs_lradc *lradc)
> +{
> + mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0);
> + mxs_lradc_reg_set(lradc, mxs_lradc_drive_x_plate(lradc), LRADC_CTRL0);
> +
> + lradc->cur_plate = LRADC_SAMPLE_X;
> + mxs_lradc_map_channel(lradc, TOUCHSCREEN_VCHANNEL1, TS_CH_YP);
> + mxs_lradc_setup_ts_channel(lradc, TOUCHSCREEN_VCHANNEL1);
> +}
> +
> +/*
> + * YP(+)--+-------------+
> + * | |--+
> + * | | |
> + * YM(-)--+-------------+ |
> + * +--------------+
> + * | |
> + * XP(open) XM(meas)
> + *
> + * (+) means here 1.85 V
> + * (-) means here GND
> + */
> +static void mxs_lradc_prepare_y_pos(struct mxs_lradc *lradc)
> +{
> + mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0);
> + mxs_lradc_reg_set(lradc, mxs_lradc_drive_y_plate(lradc), LRADC_CTRL0);
> +
> + lradc->cur_plate = LRADC_SAMPLE_Y;
> + mxs_lradc_map_channel(lradc, TOUCHSCREEN_VCHANNEL1, TS_CH_XM);
> + mxs_lradc_setup_ts_channel(lradc, TOUCHSCREEN_VCHANNEL1);
> +}
> +
> +/*
> + * YP(+)--+-------------+
> + * | |--+
> + * | | |
> + * YM(meas)--+-------------+ |
> + * +--------------+
> + * | |
> + * XP(meas) XM(-)
> + *
> + * (+) means here 1.85 V
> + * (-) means here GND
> + */
> +static void mxs_lradc_prepare_pressure(struct mxs_lradc *lradc)
> +{
> + mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0);
> + mxs_lradc_reg_set(lradc, mxs_lradc_drive_pressure(lradc), LRADC_CTRL0);
> +
> + lradc->cur_plate = LRADC_SAMPLE_PRESSURE;
> + mxs_lradc_map_channel(lradc, TOUCHSCREEN_VCHANNEL1, TS_CH_YM);
> + mxs_lradc_map_channel(lradc, TOUCHSCREEN_VCHANNEL2, TS_CH_XP);
> + mxs_lradc_setup_ts_pressure(lradc, TOUCHSCREEN_VCHANNEL2,
> + TOUCHSCREEN_VCHANNEL1);
> +}
> +
> +static void mxs_lradc_enable_touch_detection(struct mxs_lradc *lradc)
> +{
> + mxs_lradc_setup_touch_detection(lradc);
> +
> + lradc->cur_plate = LRADC_TOUCH;
> + mxs_lradc_reg_clear(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ |
> + LRADC_CTRL1_TOUCH_DETECT_IRQ_EN, LRADC_CTRL1);
> + mxs_lradc_reg_set(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ_EN, LRADC_CTRL1);
> +}
> +
> +static void mxs_lradc_start_touch_event(struct mxs_lradc *lradc)
> +{
> + mxs_lradc_reg_clear(lradc,
> + LRADC_CTRL1_TOUCH_DETECT_IRQ_EN,
> + LRADC_CTRL1);
> + mxs_lradc_reg_set(lradc,
> + LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL1),
> + LRADC_CTRL1);
> + /*
> + * start with the Y-pos, because it uses nearly the same plate
> + * settings like the touch detection
> + */
> + mxs_lradc_prepare_y_pos(lradc);
> +}
> +
> +static void mxs_lradc_report_ts_event(struct mxs_lradc *lradc)
> +{
> + input_report_abs(lradc->ts_input, ABS_X, lradc->ts_x_pos);
> + input_report_abs(lradc->ts_input, ABS_Y, lradc->ts_y_pos);
> + input_report_abs(lradc->ts_input, ABS_PRESSURE, lradc->ts_pressure);
> + input_report_key(lradc->ts_input, BTN_TOUCH, 1);
> + input_sync(lradc->ts_input);
> +}
> +
> +static void mxs_lradc_complete_touch_event(struct mxs_lradc *lradc)
> +{
> + mxs_lradc_setup_touch_detection(lradc);
> + lradc->cur_plate = LRADC_SAMPLE_VALID;
> + /*
> + * start a dummy conversion to burn time to settle the signals
> + * note: we are not interested in the conversion's value
> + */
> + mxs_lradc_reg_wrt(lradc, 0, LRADC_CH(TOUCHSCREEN_VCHANNEL1));
> + mxs_lradc_reg_clear(lradc,
> + LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1) |
> + LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL2),
> + LRADC_CTRL1);
> + mxs_lradc_reg_wrt(
> + lradc,
> + LRADC_DELAY_TRIGGER(1 << TOUCHSCREEN_VCHANNEL1) |
> + LRADC_DELAY_KICK | LRADC_DELAY_DELAY(10), /* waste 5 ms */
> + LRADC_DELAY(2));
> +}
> +
> +/*
> + * in order to avoid false measurements, report only samples where
> + * the surface is still touched after the position measurement
> + */
> +static void mxs_lradc_finish_touch_event(struct mxs_lradc *lradc, bool valid)
> +{
> + /* if it is still touched, report the sample */
> + if (valid && mxs_lradc_check_touch_event(lradc)) {
> + lradc->ts_valid = true;
> + mxs_lradc_report_ts_event(lradc);
> + }
> +
> + /* if it is even still touched, continue with the next measurement */
> + if (mxs_lradc_check_touch_event(lradc)) {
> + mxs_lradc_prepare_y_pos(lradc);
> + return;
> + }
> +
> + if (lradc->ts_valid) {
> + /* signal the release */
> + lradc->ts_valid = false;
> + input_report_key(lradc->ts_input, BTN_TOUCH, 0);
> + input_sync(lradc->ts_input);
> + }
> +
> + /* if it is released, wait for the next touch via IRQ */
> + lradc->cur_plate = LRADC_TOUCH;
> + mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(2));
> + mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(3));
> + mxs_lradc_reg_clear(lradc,
> + LRADC_CTRL1_TOUCH_DETECT_IRQ |
> + LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL1) |
> + LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1),
> + LRADC_CTRL1);
> + mxs_lradc_reg_set(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ_EN, LRADC_CTRL1);
> +}
> +
> +/* touchscreen's state machine */
> +static void mxs_lradc_handle_touch(struct mxs_lradc *lradc)
> +{
> + switch (lradc->cur_plate) {
> + case LRADC_TOUCH:
> + if (mxs_lradc_check_touch_event(lradc))
> + mxs_lradc_start_touch_event(lradc);
> + mxs_lradc_reg_clear(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ,
> + LRADC_CTRL1);
> + return;
> +
> + case LRADC_SAMPLE_Y:
> + lradc->ts_y_pos =
> + mxs_lradc_read_raw_channel(lradc,
> + TOUCHSCREEN_VCHANNEL1);
> + mxs_lradc_prepare_x_pos(lradc);
> + return;
> +
> + case LRADC_SAMPLE_X:
> + lradc->ts_x_pos =
> + mxs_lradc_read_raw_channel(lradc,
> + TOUCHSCREEN_VCHANNEL1);
> + mxs_lradc_prepare_pressure(lradc);
> + return;
> +
> + case LRADC_SAMPLE_PRESSURE:
> + lradc->ts_pressure =
> + mxs_lradc_read_ts_pressure(lradc,
> + TOUCHSCREEN_VCHANNEL2,
> + TOUCHSCREEN_VCHANNEL1);
> + mxs_lradc_complete_touch_event(lradc);
> + return;
> +
> + case LRADC_SAMPLE_VALID:
> + mxs_lradc_finish_touch_event(lradc, 1);
> + break;
> + }
> +}
> +
> +/*
> + * Raw I/O operations
> + */
> +static int mxs_lradc_read_single(struct iio_dev *iio_dev, int chan, int *val)
> +{
> + struct mxs_lradc *lradc = iio_priv(iio_dev);
> + int ret;
> +
> + /*
> + * See if there is no buffered operation in progress. If there is, simply
> + * bail out. This can be improved to support both buffered and raw IO at
> + * the same time, yet the code becomes horribly complicated. Therefore I
> + * applied KISS principle here.
> + */
> + ret = mutex_trylock(&lradc->lock);
> + if (!ret)
> + return -EBUSY;
> +
> + reinit_completion(&lradc->completion);
> +
> + /*
> + * No buffered operation in progress, map the channel and trigger it.
> + * Virtual channel 0 is always used here as the others are always not
> + * used if doing raw sampling.
> + */
> + if (lradc->soc == IMX28_LRADC)
> + mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ_EN(0),
> + LRADC_CTRL1);
> + mxs_lradc_reg_clear(lradc, 0x1, LRADC_CTRL0);
> +
> + /* Enable / disable the divider per requirement */
> + if (test_bit(chan, &lradc->is_divided))
> + mxs_lradc_reg_set(lradc,
> + 1 << LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET,
> + LRADC_CTRL2);
> + else
> + mxs_lradc_reg_clear(lradc,
> + 1 << LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET,
> + LRADC_CTRL2);
> +
> + /* Clean the slot's previous content, then set new one. */
> + mxs_lradc_reg_clear(lradc, LRADC_CTRL4_LRADCSELECT_MASK(0),
> + LRADC_CTRL4);
> + mxs_lradc_reg_set(lradc, chan, LRADC_CTRL4);
> +
> + mxs_lradc_reg_wrt(lradc, 0, LRADC_CH(0));
> +
> + /* Enable the IRQ and start sampling the channel. */
> + mxs_lradc_reg_set(lradc, LRADC_CTRL1_LRADC_IRQ_EN(0), LRADC_CTRL1);
> + mxs_lradc_reg_set(lradc, BIT(0), LRADC_CTRL0);
> +
> + /* Wait for completion on the channel, 1 second max. */
> + ret = wait_for_completion_killable_timeout(&lradc->completion, HZ);
> + if (!ret)
> + ret = -ETIMEDOUT;
> + if (ret < 0)
> + goto err;
> +
> + /* Read the data. */
> + *val = readl(lradc->base + LRADC_CH(0)) & LRADC_CH_VALUE_MASK;
> + ret = IIO_VAL_INT;
> +
> +err:
> + mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ_EN(0), LRADC_CTRL1);
> +
> + mutex_unlock(&lradc->lock);
> +
> + return ret;
> +}
> +
> +static int mxs_lradc_read_temp(struct iio_dev *iio_dev, int *val)
> +{
> + int ret, min, max;
> +
> + ret = mxs_lradc_read_single(iio_dev, 8, &min);
> + if (ret != IIO_VAL_INT)
> + return ret;
> +
> + ret = mxs_lradc_read_single(iio_dev, 9, &max);
> + if (ret != IIO_VAL_INT)
> + return ret;
> +
> + *val = max - min;
> +
> + return IIO_VAL_INT;
> +}
> +
> +static int mxs_lradc_read_raw(struct iio_dev *iio_dev,
> + const struct iio_chan_spec *chan,
> + int *val, int *val2, long m)
> +{
> + struct mxs_lradc *lradc = iio_priv(iio_dev);
> +
> + switch (m) {
> + case IIO_CHAN_INFO_RAW:
> + if (chan->type == IIO_TEMP)
> + return mxs_lradc_read_temp(iio_dev, val);
> +
> + return mxs_lradc_read_single(iio_dev, chan->channel, val);
> +
> + case IIO_CHAN_INFO_SCALE:
> + if (chan->type == IIO_TEMP) {
> + /* From the datasheet, we have to multiply by 1.012 and
> + * divide by 4
> + */
> + *val = 0;
> + *val2 = 253000;
> + return IIO_VAL_INT_PLUS_MICRO;
> + }
> +
> + *val = lradc->vref_mv[chan->channel];
> + *val2 = chan->scan_type.realbits -
> + test_bit(chan->channel, &lradc->is_divided);
> + return IIO_VAL_FRACTIONAL_LOG2;
> +
> + case IIO_CHAN_INFO_OFFSET:
> + if (chan->type == IIO_TEMP) {
> + /* The calculated value from the ADC is in Kelvin, we
> + * want Celsius for hwmon so the offset is -273.15
> + * The offset is applied before scaling so it is
> + * actually -213.15 * 4 / 1.012 = -1079.644268
> + */
> + *val = -1079;
> + *val2 = 644268;
> +
> + return IIO_VAL_INT_PLUS_MICRO;
> + }
> +
> + return -EINVAL;
> +
> + default:
> + break;
> + }
> +
> + return -EINVAL;
> +}
> +
> +static int mxs_lradc_write_raw(struct iio_dev *iio_dev,
> + const struct iio_chan_spec *chan,
> + int val, int val2, long m)
> +{
> + struct mxs_lradc *lradc = iio_priv(iio_dev);
> + struct mxs_lradc_scale *scale_avail =
> + lradc->scale_avail[chan->channel];
> + int ret;
> +
> + ret = mutex_trylock(&lradc->lock);
> + if (!ret)
> + return -EBUSY;
> +
> + switch (m) {
> + case IIO_CHAN_INFO_SCALE:
> + ret = -EINVAL;
> + if (val == scale_avail[MXS_LRADC_DIV_DISABLED].integer &&
> + val2 == scale_avail[MXS_LRADC_DIV_DISABLED].nano) {
> + /* divider by two disabled */
> + clear_bit(chan->channel, &lradc->is_divided);
> + ret = 0;
> + } else if (val == scale_avail[MXS_LRADC_DIV_ENABLED].integer &&
> + val2 == scale_avail[MXS_LRADC_DIV_ENABLED].nano) {
> + /* divider by two enabled */
> + set_bit(chan->channel, &lradc->is_divided);
> + ret = 0;
> + }
> +
> + break;
> + default:
> + ret = -EINVAL;
> + break;
> + }
> +
> + mutex_unlock(&lradc->lock);
> +
> + return ret;
> +}
> +
> +static int mxs_lradc_write_raw_get_fmt(struct iio_dev *iio_dev,
> + const struct iio_chan_spec *chan,
> + long m)
> +{
> + return IIO_VAL_INT_PLUS_NANO;
> +}
> +
> +static ssize_t mxs_lradc_show_scale_available_ch(struct device *dev,
> + struct device_attribute *attr,
> + char *buf,
> + int ch)
> +{
> + struct iio_dev *iio = dev_to_iio_dev(dev);
> + struct mxs_lradc *lradc = iio_priv(iio);
> + int i, len = 0;
> +
> + for (i = 0; i < ARRAY_SIZE(lradc->scale_avail[ch]); i++)
> + len += sprintf(buf + len, "%u.%09u ",
> + lradc->scale_avail[ch][i].integer,
> + lradc->scale_avail[ch][i].nano);
> +
> + len += sprintf(buf + len, "\n");
> +
> + return len;
> +}
> +
> +static ssize_t mxs_lradc_show_scale_available(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct iio_dev_attr *iio_attr = to_iio_dev_attr(attr);
> +
> + return mxs_lradc_show_scale_available_ch(dev, attr, buf,
> + iio_attr->address);
> +}
> +
> +#define SHOW_SCALE_AVAILABLE_ATTR(ch) \
> +static IIO_DEVICE_ATTR(in_voltage##ch##_scale_available, S_IRUGO, \
> + mxs_lradc_show_scale_available, NULL, ch)
> +
> +SHOW_SCALE_AVAILABLE_ATTR(0);
> +SHOW_SCALE_AVAILABLE_ATTR(1);
> +SHOW_SCALE_AVAILABLE_ATTR(2);
> +SHOW_SCALE_AVAILABLE_ATTR(3);
> +SHOW_SCALE_AVAILABLE_ATTR(4);
> +SHOW_SCALE_AVAILABLE_ATTR(5);
> +SHOW_SCALE_AVAILABLE_ATTR(6);
> +SHOW_SCALE_AVAILABLE_ATTR(7);
> +SHOW_SCALE_AVAILABLE_ATTR(10);
> +SHOW_SCALE_AVAILABLE_ATTR(11);
> +SHOW_SCALE_AVAILABLE_ATTR(12);
> +SHOW_SCALE_AVAILABLE_ATTR(13);
> +SHOW_SCALE_AVAILABLE_ATTR(14);
> +SHOW_SCALE_AVAILABLE_ATTR(15);
> +
> +static struct attribute *mxs_lradc_attributes[] = {
> + &iio_dev_attr_in_voltage0_scale_available.dev_attr.attr,
> + &iio_dev_attr_in_voltage1_scale_available.dev_attr.attr,
> + &iio_dev_attr_in_voltage2_scale_available.dev_attr.attr,
> + &iio_dev_attr_in_voltage3_scale_available.dev_attr.attr,
> + &iio_dev_attr_in_voltage4_scale_available.dev_attr.attr,
> + &iio_dev_attr_in_voltage5_scale_available.dev_attr.attr,
> + &iio_dev_attr_in_voltage6_scale_available.dev_attr.attr,
> + &iio_dev_attr_in_voltage7_scale_available.dev_attr.attr,
> + &iio_dev_attr_in_voltage10_scale_available.dev_attr.attr,
> + &iio_dev_attr_in_voltage11_scale_available.dev_attr.attr,
> + &iio_dev_attr_in_voltage12_scale_available.dev_attr.attr,
> + &iio_dev_attr_in_voltage13_scale_available.dev_attr.attr,
> + &iio_dev_attr_in_voltage14_scale_available.dev_attr.attr,
> + &iio_dev_attr_in_voltage15_scale_available.dev_attr.attr,
> + NULL
> +};
> +
> +static const struct attribute_group mxs_lradc_attribute_group = {
> + .attrs = mxs_lradc_attributes,
> +};
> +
> +static const struct iio_info mxs_lradc_iio_info = {
> + .driver_module = THIS_MODULE,
> + .read_raw = mxs_lradc_read_raw,
> + .write_raw = mxs_lradc_write_raw,
> + .write_raw_get_fmt = mxs_lradc_write_raw_get_fmt,
> + .attrs = &mxs_lradc_attribute_group,
> +};
> +
> +static int mxs_lradc_ts_open(struct input_dev *dev)
> +{
> + struct mxs_lradc *lradc = input_get_drvdata(dev);
> +
> + /* Enable the touch-detect circuitry. */
> + mxs_lradc_enable_touch_detection(lradc);
> +
> + return 0;
> +}
> +
> +static void mxs_lradc_disable_ts(struct mxs_lradc *lradc)
> +{
> + /* stop all interrupts from firing */
> + mxs_lradc_reg_clear(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ_EN |
> + LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL1) |
> + LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL2), LRADC_CTRL1);
> +
> + /* Power-down touchscreen touch-detect circuitry. */
> + mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0);
> +}
> +
> +static void mxs_lradc_ts_close(struct input_dev *dev)
> +{
> + struct mxs_lradc *lradc = input_get_drvdata(dev);
> +
> + mxs_lradc_disable_ts(lradc);
> +}
> +
> +static int mxs_lradc_ts_register(struct mxs_lradc *lradc)
> +{
> + struct input_dev *input;
> + struct device *dev = lradc->dev;
> + int ret;
> +
> + if (!lradc->use_touchscreen)
> + return 0;
> +
> + input = input_allocate_device();
> + if (!input)
> + return -ENOMEM;
> +
> + input->name = DRIVER_NAME;
> + input->id.bustype = BUS_HOST;
> + input->dev.parent = dev;
> + input->open = mxs_lradc_ts_open;
> + input->close = mxs_lradc_ts_close;
> +
> + __set_bit(EV_ABS, input->evbit);
> + __set_bit(EV_KEY, input->evbit);
> + __set_bit(BTN_TOUCH, input->keybit);
> + input_set_abs_params(input, ABS_X, 0, LRADC_SINGLE_SAMPLE_MASK, 0, 0);
> + input_set_abs_params(input, ABS_Y, 0, LRADC_SINGLE_SAMPLE_MASK, 0, 0);
> + input_set_abs_params(input, ABS_PRESSURE, 0, LRADC_SINGLE_SAMPLE_MASK,
> + 0, 0);
> +
> + lradc->ts_input = input;
> + input_set_drvdata(input, lradc);
> + ret = input_register_device(input);
> + if (ret)
> + input_free_device(lradc->ts_input);
> +
> + return ret;
> +}
> +
> +static void mxs_lradc_ts_unregister(struct mxs_lradc *lradc)
> +{
> + if (!lradc->use_touchscreen)
> + return;
> +
> + mxs_lradc_disable_ts(lradc);
> + input_unregister_device(lradc->ts_input);
> +}
> +
> +/*
> + * IRQ Handling
> + */
> +static irqreturn_t mxs_lradc_handle_irq(int irq, void *data)
> +{
> + struct iio_dev *iio = data;
> + struct mxs_lradc *lradc = iio_priv(iio);
> + unsigned long reg = readl(lradc->base + LRADC_CTRL1);
> + u32 clr_irq = mxs_lradc_irq_mask(lradc);
> + const u32 ts_irq_mask =
> + LRADC_CTRL1_TOUCH_DETECT_IRQ |
> + LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1) |
> + LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL2);
> +
> + if (!(reg & mxs_lradc_irq_mask(lradc)))
> + return IRQ_NONE;
> +
> + if (lradc->use_touchscreen && (reg & ts_irq_mask)) {
> + mxs_lradc_handle_touch(lradc);
> +
> + /* Make sure we don't clear the next conversion's interrupt. */
> + clr_irq &= ~(LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1) |
> + LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL2));
> + }
> +
> + if (iio_buffer_enabled(iio)) {
> + if (reg & lradc->buffer_vchans)
> + iio_trigger_poll(iio->trig);
> + } else if (reg & LRADC_CTRL1_LRADC_IRQ(0)) {
> + complete(&lradc->completion);
> + }
> +
> + mxs_lradc_reg_clear(lradc, reg & clr_irq, LRADC_CTRL1);
> +
> + return IRQ_HANDLED;
> +}
> +
> +/*
> + * Trigger handling
> + */
> +static irqreturn_t mxs_lradc_trigger_handler(int irq, void *p)
> +{
> + struct iio_poll_func *pf = p;
> + struct iio_dev *iio = pf->indio_dev;
> + struct mxs_lradc *lradc = iio_priv(iio);
> + const u32 chan_value = LRADC_CH_ACCUMULATE |
> + ((LRADC_DELAY_TIMER_LOOP - 1) << LRADC_CH_NUM_SAMPLES_OFFSET);
> + unsigned int i, j = 0;
> +
> + for_each_set_bit(i, iio->active_scan_mask, LRADC_MAX_TOTAL_CHANS) {
> + lradc->buffer[j] = readl(lradc->base + LRADC_CH(j));
> + mxs_lradc_reg_wrt(lradc, chan_value, LRADC_CH(j));
> + lradc->buffer[j] &= LRADC_CH_VALUE_MASK;
> + lradc->buffer[j] /= LRADC_DELAY_TIMER_LOOP;
> + j++;
> + }
> +
> + iio_push_to_buffers_with_timestamp(iio, lradc->buffer, pf->timestamp);
> +
> + iio_trigger_notify_done(iio->trig);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static int mxs_lradc_configure_trigger(struct iio_trigger *trig, bool state)
> +{
> + struct iio_dev *iio = iio_trigger_get_drvdata(trig);
> + struct mxs_lradc *lradc = iio_priv(iio);
> + const u32 st = state ? STMP_OFFSET_REG_SET : STMP_OFFSET_REG_CLR;
> +
> + mxs_lradc_reg_wrt(lradc, LRADC_DELAY_KICK, LRADC_DELAY(0) + st);
> +
> + return 0;
> +}
> +
> +static const struct iio_trigger_ops mxs_lradc_trigger_ops = {
> + .owner = THIS_MODULE,
> + .set_trigger_state = &mxs_lradc_configure_trigger,
> +};
> +
> +static int mxs_lradc_trigger_init(struct iio_dev *iio)
> +{
> + int ret;
> + struct iio_trigger *trig;
> + struct mxs_lradc *lradc = iio_priv(iio);
> +
> + trig = iio_trigger_alloc("%s-dev%i", iio->name, iio->id);
> + if (!trig)
> + return -ENOMEM;
> +
> + trig->dev.parent = lradc->dev;
> + iio_trigger_set_drvdata(trig, iio);
> + trig->ops = &mxs_lradc_trigger_ops;
> +
> + ret = iio_trigger_register(trig);
> + if (ret) {
> + iio_trigger_free(trig);
> + return ret;
> + }
> +
> + lradc->trig = trig;
> +
> + return 0;
> +}
> +
> +static void mxs_lradc_trigger_remove(struct iio_dev *iio)
> +{
> + struct mxs_lradc *lradc = iio_priv(iio);
> +
> + iio_trigger_unregister(lradc->trig);
> + iio_trigger_free(lradc->trig);
> +}
> +
> +static int mxs_lradc_buffer_preenable(struct iio_dev *iio)
> +{
> + struct mxs_lradc *lradc = iio_priv(iio);
> + int ret = 0, chan, ofs = 0;
> + unsigned long enable = 0;
> + u32 ctrl4_set = 0;
> + u32 ctrl4_clr = 0;
> + u32 ctrl1_irq = 0;
> + const u32 chan_value = LRADC_CH_ACCUMULATE |
> + ((LRADC_DELAY_TIMER_LOOP - 1) << LRADC_CH_NUM_SAMPLES_OFFSET);
> + const int len = bitmap_weight(iio->active_scan_mask,
> + LRADC_MAX_TOTAL_CHANS);
> +
> + if (!len)
> + return -EINVAL;
> +
> + /*
> + * Lock the driver so raw access can not be done during buffered
> + * operation. This simplifies the code a lot.
> + */
> + ret = mutex_trylock(&lradc->lock);
> + if (!ret)
> + return -EBUSY;
> +
> + lradc->buffer = kmalloc_array(len, sizeof(*lradc->buffer), GFP_KERNEL);
> + if (!lradc->buffer) {
> + ret = -ENOMEM;
> + goto err_mem;
> + }
> +
> + if (lradc->soc == IMX28_LRADC)
> + mxs_lradc_reg_clear(
> + lradc,
> + lradc->buffer_vchans << LRADC_CTRL1_LRADC_IRQ_EN_OFFSET,
> + LRADC_CTRL1);
> + mxs_lradc_reg_clear(lradc, lradc->buffer_vchans, LRADC_CTRL0);
> +
> + for_each_set_bit(chan, iio->active_scan_mask, LRADC_MAX_TOTAL_CHANS) {
> + ctrl4_set |= chan << LRADC_CTRL4_LRADCSELECT_OFFSET(ofs);
> + ctrl4_clr |= LRADC_CTRL4_LRADCSELECT_MASK(ofs);
> + ctrl1_irq |= LRADC_CTRL1_LRADC_IRQ_EN(ofs);
> + mxs_lradc_reg_wrt(lradc, chan_value, LRADC_CH(ofs));
> + bitmap_set(&enable, ofs, 1);
> + ofs++;
> + }
> +
> + mxs_lradc_reg_clear(lradc, LRADC_DELAY_TRIGGER_LRADCS_MASK |
> + LRADC_DELAY_KICK, LRADC_DELAY(0));
> + mxs_lradc_reg_clear(lradc, ctrl4_clr, LRADC_CTRL4);
> + mxs_lradc_reg_set(lradc, ctrl4_set, LRADC_CTRL4);
> + mxs_lradc_reg_set(lradc, ctrl1_irq, LRADC_CTRL1);
> + mxs_lradc_reg_set(lradc, enable << LRADC_DELAY_TRIGGER_LRADCS_OFFSET,
> + LRADC_DELAY(0));
> +
> + return 0;
> +
> +err_mem:
> + mutex_unlock(&lradc->lock);
> + return ret;
> +}
> +
> +static int mxs_lradc_buffer_postdisable(struct iio_dev *iio)
> +{
> + struct mxs_lradc *lradc = iio_priv(iio);
> +
> + mxs_lradc_reg_clear(lradc, LRADC_DELAY_TRIGGER_LRADCS_MASK |
> + LRADC_DELAY_KICK, LRADC_DELAY(0));
> +
> + mxs_lradc_reg_clear(lradc, lradc->buffer_vchans, LRADC_CTRL0);
> + if (lradc->soc == IMX28_LRADC)
> + mxs_lradc_reg_clear(
> + lradc,
> + lradc->buffer_vchans << LRADC_CTRL1_LRADC_IRQ_EN_OFFSET,
> + LRADC_CTRL1);
> +
> + kfree(lradc->buffer);
> + mutex_unlock(&lradc->lock);
> +
> + return 0;
> +}
> +
> +static bool mxs_lradc_validate_scan_mask(struct iio_dev *iio,
> + const unsigned long *mask)
> +{
> + struct mxs_lradc *lradc = iio_priv(iio);
> + const int map_chans = bitmap_weight(mask, LRADC_MAX_TOTAL_CHANS);
> + int rsvd_chans = 0;
> + unsigned long rsvd_mask = 0;
> +
> + if (lradc->use_touchbutton)
> + rsvd_mask |= CHAN_MASK_TOUCHBUTTON;
> + if (lradc->use_touchscreen == MXS_LRADC_TOUCHSCREEN_4WIRE)
> + rsvd_mask |= CHAN_MASK_TOUCHSCREEN_4WIRE;
> + if (lradc->use_touchscreen == MXS_LRADC_TOUCHSCREEN_5WIRE)
> + rsvd_mask |= CHAN_MASK_TOUCHSCREEN_5WIRE;
> +
> + if (lradc->use_touchbutton)
> + rsvd_chans++;
> + if (lradc->use_touchscreen)
> + rsvd_chans += 2;
> +
> + /* Test for attempts to map channels with special mode of operation. */
> + if (bitmap_intersects(mask, &rsvd_mask, LRADC_MAX_TOTAL_CHANS))
> + return false;
> +
> + /* Test for attempts to map more channels then available slots. */
> + if (map_chans + rsvd_chans > LRADC_MAX_MAPPED_CHANS)
> + return false;
> +
> + return true;
> +}
> +
> +static const struct iio_buffer_setup_ops mxs_lradc_buffer_ops = {
> + .preenable = &mxs_lradc_buffer_preenable,
> + .postenable = &iio_triggered_buffer_postenable,
> + .predisable = &iio_triggered_buffer_predisable,
> + .postdisable = &mxs_lradc_buffer_postdisable,
> + .validate_scan_mask = &mxs_lradc_validate_scan_mask,
> +};
> +
> +/*
> + * Driver initialization
> + */
> +
> +#define MXS_ADC_CHAN(idx, chan_type, name) { \
> + .type = (chan_type), \
> + .indexed = 1, \
> + .scan_index = (idx), \
> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
> + BIT(IIO_CHAN_INFO_SCALE), \
> + .channel = (idx), \
> + .address = (idx), \
> + .scan_type = { \
> + .sign = 'u', \
> + .realbits = LRADC_RESOLUTION, \
> + .storagebits = 32, \
> + }, \
> + .datasheet_name = (name), \
> +}
> +
> +static const struct iio_chan_spec mx23_lradc_chan_spec[] = {
> + MXS_ADC_CHAN(0, IIO_VOLTAGE, "LRADC0"),
> + MXS_ADC_CHAN(1, IIO_VOLTAGE, "LRADC1"),
> + MXS_ADC_CHAN(2, IIO_VOLTAGE, "LRADC2"),
> + MXS_ADC_CHAN(3, IIO_VOLTAGE, "LRADC3"),
> + MXS_ADC_CHAN(4, IIO_VOLTAGE, "LRADC4"),
> + MXS_ADC_CHAN(5, IIO_VOLTAGE, "LRADC5"),
> + MXS_ADC_CHAN(6, IIO_VOLTAGE, "VDDIO"),
> + MXS_ADC_CHAN(7, IIO_VOLTAGE, "VBATT"),
> + /* Combined Temperature sensors */
> + {
> + .type = IIO_TEMP,
> + .indexed = 1,
> + .scan_index = 8,
> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
> + BIT(IIO_CHAN_INFO_OFFSET) |
> + BIT(IIO_CHAN_INFO_SCALE),
> + .channel = 8,
> + .scan_type = {.sign = 'u', .realbits = 18, .storagebits = 32,},
> + .datasheet_name = "TEMP_DIE",
> + },
> + /* Hidden channel to keep indexes */
> + {
> + .type = IIO_TEMP,
> + .indexed = 1,
> + .scan_index = -1,
> + .channel = 9,
> + },
> + MXS_ADC_CHAN(10, IIO_VOLTAGE, NULL),
> + MXS_ADC_CHAN(11, IIO_VOLTAGE, NULL),
> + MXS_ADC_CHAN(12, IIO_VOLTAGE, "USB_DP"),
> + MXS_ADC_CHAN(13, IIO_VOLTAGE, "USB_DN"),
> + MXS_ADC_CHAN(14, IIO_VOLTAGE, "VBG"),
> + MXS_ADC_CHAN(15, IIO_VOLTAGE, "VDD5V"),
> +};
> +
> +static const struct iio_chan_spec mx28_lradc_chan_spec[] = {
> + MXS_ADC_CHAN(0, IIO_VOLTAGE, "LRADC0"),
> + MXS_ADC_CHAN(1, IIO_VOLTAGE, "LRADC1"),
> + MXS_ADC_CHAN(2, IIO_VOLTAGE, "LRADC2"),
> + MXS_ADC_CHAN(3, IIO_VOLTAGE, "LRADC3"),
> + MXS_ADC_CHAN(4, IIO_VOLTAGE, "LRADC4"),
> + MXS_ADC_CHAN(5, IIO_VOLTAGE, "LRADC5"),
> + MXS_ADC_CHAN(6, IIO_VOLTAGE, "LRADC6"),
> + MXS_ADC_CHAN(7, IIO_VOLTAGE, "VBATT"),
> + /* Combined Temperature sensors */
> + {
> + .type = IIO_TEMP,
> + .indexed = 1,
> + .scan_index = 8,
> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
> + BIT(IIO_CHAN_INFO_OFFSET) |
> + BIT(IIO_CHAN_INFO_SCALE),
> + .channel = 8,
> + .scan_type = {.sign = 'u', .realbits = 18, .storagebits = 32,},
> + .datasheet_name = "TEMP_DIE",
> + },
> + /* Hidden channel to keep indexes */
> + {
> + .type = IIO_TEMP,
> + .indexed = 1,
> + .scan_index = -1,
> + .channel = 9,
> + },
> + MXS_ADC_CHAN(10, IIO_VOLTAGE, "VDDIO"),
> + MXS_ADC_CHAN(11, IIO_VOLTAGE, "VTH"),
> + MXS_ADC_CHAN(12, IIO_VOLTAGE, "VDDA"),
> + MXS_ADC_CHAN(13, IIO_VOLTAGE, "VDDD"),
> + MXS_ADC_CHAN(14, IIO_VOLTAGE, "VBG"),
> + MXS_ADC_CHAN(15, IIO_VOLTAGE, "VDD5V"),
> +};
> +
> +static int mxs_lradc_hw_init(struct mxs_lradc *lradc)
> +{
> + /* The ADC always uses DELAY CHANNEL 0. */
> + const u32 adc_cfg =
> + (1 << (LRADC_DELAY_TRIGGER_DELAYS_OFFSET + 0)) |
> + (LRADC_DELAY_TIMER_PER << LRADC_DELAY_DELAY_OFFSET);
> +
> + int ret = stmp_reset_block(lradc->base);
> +
> + if (ret)
> + return ret;
> +
> + /* Configure DELAY CHANNEL 0 for generic ADC sampling. */
> + mxs_lradc_reg_wrt(lradc, adc_cfg, LRADC_DELAY(0));
> +
> + /* Disable remaining DELAY CHANNELs */
> + mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(1));
> + mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(2));
> + mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(3));
> +
> + /* Configure the touchscreen type */
> + if (lradc->soc == IMX28_LRADC) {
> + mxs_lradc_reg_clear(lradc, LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE,
> + LRADC_CTRL0);
> +
> + if (lradc->use_touchscreen == MXS_LRADC_TOUCHSCREEN_5WIRE)
> + mxs_lradc_reg_set(lradc, LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE,
> + LRADC_CTRL0);
> + }
> +
> + /* Start internal temperature sensing. */
> + mxs_lradc_reg_wrt(lradc, 0, LRADC_CTRL2);
> +
> + return 0;
> +}
> +
> +static void mxs_lradc_hw_stop(struct mxs_lradc *lradc)
> +{
> + int i;
> +
> + mxs_lradc_reg_clear(lradc, mxs_lradc_irq_en_mask(lradc), LRADC_CTRL1);
> +
> + for (i = 0; i < LRADC_MAX_DELAY_CHANS; i++)
> + mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(i));
> +}
> +
> +static const struct of_device_id mxs_lradc_dt_ids[] = {
> + { .compatible = "fsl,imx23-lradc", .data = (void *)IMX23_LRADC, },
> + { .compatible = "fsl,imx28-lradc", .data = (void *)IMX28_LRADC, },
> + { /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, mxs_lradc_dt_ids);
> +
> +static int mxs_lradc_probe_touchscreen(struct mxs_lradc *lradc,
> + struct device_node *lradc_node)
> +{
> + int ret;
> + u32 ts_wires = 0, adapt;
> +
> + ret = of_property_read_u32(lradc_node, "fsl,lradc-touchscreen-wires",
> + &ts_wires);
> + if (ret)
> + return -ENODEV; /* touchscreen feature disabled */
> +
> + switch (ts_wires) {
> + case 4:
> + lradc->use_touchscreen = MXS_LRADC_TOUCHSCREEN_4WIRE;
> + break;
> + case 5:
> + if (lradc->soc == IMX28_LRADC) {
> + lradc->use_touchscreen = MXS_LRADC_TOUCHSCREEN_5WIRE;
> + break;
> + }
> + /* fall through an error message for i.MX23 */
> + default:
> + dev_err(lradc->dev,
> + "Unsupported number of touchscreen wires (%d)\n",
> + ts_wires);
> + return -EINVAL;
> + }
> +
> + if (of_property_read_u32(lradc_node, "fsl,ave-ctrl", &adapt)) {
> + lradc->over_sample_cnt = 4;
> + } else {
> + if (adapt < 1 || adapt > 32) {
> + dev_err(lradc->dev, "Invalid sample count (%u)\n",
> + adapt);
> + return -EINVAL;
> + }
> + lradc->over_sample_cnt = adapt;
> + }
> +
> + if (of_property_read_u32(lradc_node, "fsl,ave-delay", &adapt)) {
> + lradc->over_sample_delay = 2;
> + } else {
> + if (adapt < 2 || adapt > LRADC_DELAY_DELAY_MASK + 1) {
> + dev_err(lradc->dev, "Invalid sample delay (%u)\n",
> + adapt);
> + return -EINVAL;
> + }
> + lradc->over_sample_delay = adapt;
> + }
> +
> + if (of_property_read_u32(lradc_node, "fsl,settling", &adapt)) {
> + lradc->settling_delay = 10;
> + } else {
> + if (adapt < 1 || adapt > LRADC_DELAY_DELAY_MASK) {
> + dev_err(lradc->dev, "Invalid settling delay (%u)\n",
> + adapt);
> + return -EINVAL;
> + }
> + lradc->settling_delay = adapt;
> + }
> +
> + return 0;
> +}
> +
> +static int mxs_lradc_probe(struct platform_device *pdev)
> +{
> + const struct of_device_id *of_id =
> + of_match_device(mxs_lradc_dt_ids, &pdev->dev);
> + const struct mxs_lradc_of_config *of_cfg =
> + &mxs_lradc_of_config[(enum mxs_lradc_id)of_id->data];
> + struct device *dev = &pdev->dev;
> + struct device_node *node = dev->of_node;
> + struct mxs_lradc *lradc;
> + struct iio_dev *iio;
> + struct resource *iores;
> + int ret = 0, touch_ret;
> + int i, s;
> + u64 scale_uv;
> +
> + /* Allocate the IIO device. */
> + iio = devm_iio_device_alloc(dev, sizeof(*lradc));
> + if (!iio) {
> + dev_err(dev, "Failed to allocate IIO device\n");
> + return -ENOMEM;
> + }
> +
> + lradc = iio_priv(iio);
> + lradc->soc = (enum mxs_lradc_id)of_id->data;
> +
> + /* Grab the memory area */
> + iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + lradc->dev = &pdev->dev;
> + lradc->base = devm_ioremap_resource(dev, iores);
> + if (IS_ERR(lradc->base))
> + return PTR_ERR(lradc->base);
> +
> + lradc->clk = devm_clk_get(&pdev->dev, NULL);
> + if (IS_ERR(lradc->clk)) {
> + dev_err(dev, "Failed to get the delay unit clock\n");
> + return PTR_ERR(lradc->clk);
> + }
> + ret = clk_prepare_enable(lradc->clk);
> + if (ret != 0) {
> + dev_err(dev, "Failed to enable the delay unit clock\n");
> + return ret;
> + }
> +
> + touch_ret = mxs_lradc_probe_touchscreen(lradc, node);
> +
> + if (touch_ret == 0)
> + lradc->buffer_vchans = BUFFER_VCHANS_LIMITED;
> + else
> + lradc->buffer_vchans = BUFFER_VCHANS_ALL;
> +
> + /* Grab all IRQ sources */
> + for (i = 0; i < of_cfg->irq_count; i++) {
> + lradc->irq[i] = platform_get_irq(pdev, i);
> + if (lradc->irq[i] < 0) {
> + ret = lradc->irq[i];
> + goto err_clk;
> + }
> +
> + ret = devm_request_irq(dev, lradc->irq[i],
> + mxs_lradc_handle_irq, 0,
> + of_cfg->irq_name[i], iio);
> + if (ret)
> + goto err_clk;
> + }
> +
> + lradc->vref_mv = of_cfg->vref_mv;
> +
> + platform_set_drvdata(pdev, iio);
> +
> + init_completion(&lradc->completion);
> + mutex_init(&lradc->lock);
> +
> + iio->name = pdev->name;
> + iio->dev.parent = &pdev->dev;
> + iio->info = &mxs_lradc_iio_info;
> + iio->modes = INDIO_DIRECT_MODE;
> + iio->masklength = LRADC_MAX_TOTAL_CHANS;
> +
> + if (lradc->soc == IMX23_LRADC) {
> + iio->channels = mx23_lradc_chan_spec;
> + iio->num_channels = ARRAY_SIZE(mx23_lradc_chan_spec);
> + } else {
> + iio->channels = mx28_lradc_chan_spec;
> + iio->num_channels = ARRAY_SIZE(mx28_lradc_chan_spec);
> + }
> +
> + ret = iio_triggered_buffer_setup(iio, &iio_pollfunc_store_time,
> + &mxs_lradc_trigger_handler,
> + &mxs_lradc_buffer_ops);
> + if (ret)
> + goto err_clk;
> +
> + ret = mxs_lradc_trigger_init(iio);
> + if (ret)
> + goto err_trig;
> +
> + /* Populate available ADC input ranges */
> + for (i = 0; i < LRADC_MAX_TOTAL_CHANS; i++) {
> + for (s = 0; s < ARRAY_SIZE(lradc->scale_avail[i]); s++) {
> + /*
> + * [s=0] = optional divider by two disabled (default)
> + * [s=1] = optional divider by two enabled
> + *
> + * The scale is calculated by doing:
> + * Vref >> (realbits - s)
> + * which multiplies by two on the second component
> + * of the array.
> + */
> + scale_uv = ((u64)lradc->vref_mv[i] * 100000000) >>
> + (LRADC_RESOLUTION - s);
> + lradc->scale_avail[i][s].nano =
> + do_div(scale_uv, 100000000) * 10;
> + lradc->scale_avail[i][s].integer = scale_uv;
> + }
> + }
> +
> + /* Configure the hardware. */
> + ret = mxs_lradc_hw_init(lradc);
> + if (ret)
> + goto err_dev;
> +
> + /* Register the touchscreen input device. */
> + if (touch_ret == 0) {
> + ret = mxs_lradc_ts_register(lradc);
> + if (ret)
> + goto err_ts_register;
> + }
> +
> + /* Register IIO device. */
> + ret = iio_device_register(iio);
> + if (ret) {
> + dev_err(dev, "Failed to register IIO device\n");
> + goto err_ts;
> + }
> +
> + return 0;
> +
> +err_ts:
> + mxs_lradc_ts_unregister(lradc);
> +err_ts_register:
> + mxs_lradc_hw_stop(lradc);
> +err_dev:
> + mxs_lradc_trigger_remove(iio);
> +err_trig:
> + iio_triggered_buffer_cleanup(iio);
> +err_clk:
> + clk_disable_unprepare(lradc->clk);
> + return ret;
> +}
> +
> +static int mxs_lradc_remove(struct platform_device *pdev)
> +{
> + struct iio_dev *iio = platform_get_drvdata(pdev);
> + struct mxs_lradc *lradc = iio_priv(iio);
> +
> + iio_device_unregister(iio);
> + mxs_lradc_ts_unregister(lradc);
> + mxs_lradc_hw_stop(lradc);
> + mxs_lradc_trigger_remove(iio);
> + iio_triggered_buffer_cleanup(iio);
> +
> + clk_disable_unprepare(lradc->clk);
> + return 0;
> +}
> +
> +static struct platform_driver mxs_lradc_driver = {
> + .driver = {
> + .name = DRIVER_NAME,
> + .of_match_table = mxs_lradc_dt_ids,
> + },
> + .probe = mxs_lradc_probe,
> + .remove = mxs_lradc_remove,
> +};
> +
> +module_platform_driver(mxs_lradc_driver);
> +
> +MODULE_AUTHOR("Marek Vasut <marex@...x.de>");
> +MODULE_DESCRIPTION("Freescale MXS LRADC driver");
> +MODULE_LICENSE("GPL v2");
> +MODULE_ALIAS("platform:" DRIVER_NAME);
> diff --git a/drivers/staging/iio/adc/Kconfig b/drivers/staging/iio/adc/Kconfig
> index 58d4517..53afaa2 100644
> --- a/drivers/staging/iio/adc/Kconfig
> +++ b/drivers/staging/iio/adc/Kconfig
> @@ -91,20 +91,6 @@ config LPC32XX_ADC
> activate only one via device tree selection. Provides direct access
> via sysfs.
>
> -config MXS_LRADC
> - tristate "Freescale i.MX23/i.MX28 LRADC"
> - depends on (ARCH_MXS || COMPILE_TEST) && HAS_IOMEM
> - depends on INPUT
> - select STMP_DEVICE
> - select IIO_BUFFER
> - select IIO_TRIGGERED_BUFFER
> - help
> - Say yes here to build support for i.MX23/i.MX28 LRADC convertor
> - built into these chips.
> -
> - To compile this driver as a module, choose M here: the
> - module will be called mxs-lradc.
> -
> config SPEAR_ADC
> tristate "ST SPEAr ADC"
> depends on PLAT_SPEAR || COMPILE_TEST
> diff --git a/drivers/staging/iio/adc/Makefile b/drivers/staging/iio/adc/Makefile
> index 0c87ce3..3cdd83c 100644
> --- a/drivers/staging/iio/adc/Makefile
> +++ b/drivers/staging/iio/adc/Makefile
> @@ -12,5 +12,4 @@ obj-$(CONFIG_AD7816) += ad7816.o
> obj-$(CONFIG_AD7192) += ad7192.o
> obj-$(CONFIG_AD7280) += ad7280a.o
> obj-$(CONFIG_LPC32XX_ADC) += lpc32xx_adc.o
> -obj-$(CONFIG_MXS_LRADC) += mxs-lradc.o
> obj-$(CONFIG_SPEAR_ADC) += spear_adc.o
> diff --git a/drivers/staging/iio/adc/mxs-lradc.c b/drivers/staging/iio/adc/mxs-lradc.c
> deleted file mode 100644
> index bb1f152..0000000
> --- a/drivers/staging/iio/adc/mxs-lradc.c
> +++ /dev/null
> @@ -1,1770 +0,0 @@
> -/*
> - * Freescale MXS LRADC driver
> - *
> - * Copyright (c) 2012 DENX Software Engineering, GmbH.
> - * Marek Vasut <marex@...x.de>
> - *
> - * This program is free software; you can redistribute it and/or modify
> - * it under the terms of the GNU General Public License as published by
> - * the Free Software Foundation; either version 2 of the License, or
> - * (at your option) any later version.
> - *
> - * This program is distributed in the hope that it will be useful,
> - * but WITHOUT ANY WARRANTY; without even the implied warranty of
> - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> - * GNU General Public License for more details.
> - */
> -
> -#include <linux/bitops.h>
> -#include <linux/clk.h>
> -#include <linux/completion.h>
> -#include <linux/device.h>
> -#include <linux/err.h>
> -#include <linux/input.h>
> -#include <linux/interrupt.h>
> -#include <linux/io.h>
> -#include <linux/kernel.h>
> -#include <linux/module.h>
> -#include <linux/mutex.h>
> -#include <linux/of.h>
> -#include <linux/of_device.h>
> -#include <linux/platform_device.h>
> -#include <linux/slab.h>
> -#include <linux/stmp_device.h>
> -#include <linux/sysfs.h>
> -
> -#include <linux/iio/buffer.h>
> -#include <linux/iio/iio.h>
> -#include <linux/iio/trigger.h>
> -#include <linux/iio/trigger_consumer.h>
> -#include <linux/iio/triggered_buffer.h>
> -#include <linux/iio/sysfs.h>
> -
> -#define DRIVER_NAME "mxs-lradc"
> -
> -#define LRADC_MAX_DELAY_CHANS 4
> -#define LRADC_MAX_MAPPED_CHANS 8
> -#define LRADC_MAX_TOTAL_CHANS 16
> -
> -#define LRADC_DELAY_TIMER_HZ 2000
> -
> -/*
> - * Make this runtime configurable if necessary. Currently, if the buffered mode
> - * is enabled, the LRADC takes LRADC_DELAY_TIMER_LOOP samples of data before
> - * triggering IRQ. The sampling happens every (LRADC_DELAY_TIMER_PER / 2000)
> - * seconds. The result is that the samples arrive every 500mS.
> - */
> -#define LRADC_DELAY_TIMER_PER 200
> -#define LRADC_DELAY_TIMER_LOOP 5
> -
> -/*
> - * Once the pen touches the touchscreen, the touchscreen switches from
> - * IRQ-driven mode to polling mode to prevent interrupt storm. The polling
> - * is realized by worker thread, which is called every 20 or so milliseconds.
> - * This gives the touchscreen enough fluency and does not strain the system
> - * too much.
> - */
> -#define LRADC_TS_SAMPLE_DELAY_MS 5
> -
> -/*
> - * The LRADC reads the following amount of samples from each touchscreen
> - * channel and the driver then computes average of these.
> - */
> -#define LRADC_TS_SAMPLE_AMOUNT 4
> -
> -enum mxs_lradc_id {
> - IMX23_LRADC,
> - IMX28_LRADC,
> -};
> -
> -static const char * const mx23_lradc_irq_names[] = {
> - "mxs-lradc-touchscreen",
> - "mxs-lradc-channel0",
> - "mxs-lradc-channel1",
> - "mxs-lradc-channel2",
> - "mxs-lradc-channel3",
> - "mxs-lradc-channel4",
> - "mxs-lradc-channel5",
> - "mxs-lradc-channel6",
> - "mxs-lradc-channel7",
> -};
> -
> -static const char * const mx28_lradc_irq_names[] = {
> - "mxs-lradc-touchscreen",
> - "mxs-lradc-thresh0",
> - "mxs-lradc-thresh1",
> - "mxs-lradc-channel0",
> - "mxs-lradc-channel1",
> - "mxs-lradc-channel2",
> - "mxs-lradc-channel3",
> - "mxs-lradc-channel4",
> - "mxs-lradc-channel5",
> - "mxs-lradc-channel6",
> - "mxs-lradc-channel7",
> - "mxs-lradc-button0",
> - "mxs-lradc-button1",
> -};
> -
> -struct mxs_lradc_of_config {
> - const int irq_count;
> - const char * const *irq_name;
> - const u32 *vref_mv;
> -};
> -
> -#define VREF_MV_BASE 1850
> -
> -static const u32 mx23_vref_mv[LRADC_MAX_TOTAL_CHANS] = {
> - VREF_MV_BASE, /* CH0 */
> - VREF_MV_BASE, /* CH1 */
> - VREF_MV_BASE, /* CH2 */
> - VREF_MV_BASE, /* CH3 */
> - VREF_MV_BASE, /* CH4 */
> - VREF_MV_BASE, /* CH5 */
> - VREF_MV_BASE * 2, /* CH6 VDDIO */
> - VREF_MV_BASE * 4, /* CH7 VBATT */
> - VREF_MV_BASE, /* CH8 Temp sense 0 */
> - VREF_MV_BASE, /* CH9 Temp sense 1 */
> - VREF_MV_BASE, /* CH10 */
> - VREF_MV_BASE, /* CH11 */
> - VREF_MV_BASE, /* CH12 USB_DP */
> - VREF_MV_BASE, /* CH13 USB_DN */
> - VREF_MV_BASE, /* CH14 VBG */
> - VREF_MV_BASE * 4, /* CH15 VDD5V */
> -};
> -
> -static const u32 mx28_vref_mv[LRADC_MAX_TOTAL_CHANS] = {
> - VREF_MV_BASE, /* CH0 */
> - VREF_MV_BASE, /* CH1 */
> - VREF_MV_BASE, /* CH2 */
> - VREF_MV_BASE, /* CH3 */
> - VREF_MV_BASE, /* CH4 */
> - VREF_MV_BASE, /* CH5 */
> - VREF_MV_BASE, /* CH6 */
> - VREF_MV_BASE * 4, /* CH7 VBATT */
> - VREF_MV_BASE, /* CH8 Temp sense 0 */
> - VREF_MV_BASE, /* CH9 Temp sense 1 */
> - VREF_MV_BASE * 2, /* CH10 VDDIO */
> - VREF_MV_BASE, /* CH11 VTH */
> - VREF_MV_BASE * 2, /* CH12 VDDA */
> - VREF_MV_BASE, /* CH13 VDDD */
> - VREF_MV_BASE, /* CH14 VBG */
> - VREF_MV_BASE * 4, /* CH15 VDD5V */
> -};
> -
> -static const struct mxs_lradc_of_config mxs_lradc_of_config[] = {
> - [IMX23_LRADC] = {
> - .irq_count = ARRAY_SIZE(mx23_lradc_irq_names),
> - .irq_name = mx23_lradc_irq_names,
> - .vref_mv = mx23_vref_mv,
> - },
> - [IMX28_LRADC] = {
> - .irq_count = ARRAY_SIZE(mx28_lradc_irq_names),
> - .irq_name = mx28_lradc_irq_names,
> - .vref_mv = mx28_vref_mv,
> - },
> -};
> -
> -enum mxs_lradc_ts {
> - MXS_LRADC_TOUCHSCREEN_NONE = 0,
> - MXS_LRADC_TOUCHSCREEN_4WIRE,
> - MXS_LRADC_TOUCHSCREEN_5WIRE,
> -};
> -
> -/*
> - * Touchscreen handling
> - */
> -enum lradc_ts_plate {
> - LRADC_TOUCH = 0,
> - LRADC_SAMPLE_X,
> - LRADC_SAMPLE_Y,
> - LRADC_SAMPLE_PRESSURE,
> - LRADC_SAMPLE_VALID,
> -};
> -
> -enum mxs_lradc_divbytwo {
> - MXS_LRADC_DIV_DISABLED = 0,
> - MXS_LRADC_DIV_ENABLED,
> -};
> -
> -struct mxs_lradc_scale {
> - unsigned int integer;
> - unsigned int nano;
> -};
> -
> -struct mxs_lradc {
> - struct device *dev;
> - void __iomem *base;
> - int irq[13];
> -
> - struct clk *clk;
> -
> - u32 *buffer;
> - struct iio_trigger *trig;
> -
> - struct mutex lock;
> -
> - struct completion completion;
> -
> - const u32 *vref_mv;
> - struct mxs_lradc_scale scale_avail[LRADC_MAX_TOTAL_CHANS][2];
> - unsigned long is_divided;
> -
> - /*
> - * When the touchscreen is enabled, we give it two private virtual
> - * channels: #6 and #7. This means that only 6 virtual channels (instead
> - * of 8) will be available for buffered capture.
> - */
> -#define TOUCHSCREEN_VCHANNEL1 7
> -#define TOUCHSCREEN_VCHANNEL2 6
> -#define BUFFER_VCHANS_LIMITED 0x3f
> -#define BUFFER_VCHANS_ALL 0xff
> - u8 buffer_vchans;
> -
> - /*
> - * Furthermore, certain LRADC channels are shared between touchscreen
> - * and/or touch-buttons and generic LRADC block. Therefore when using
> - * either of these, these channels are not available for the regular
> - * sampling. The shared channels are as follows:
> - *
> - * CH0 -- Touch button #0
> - * CH1 -- Touch button #1
> - * CH2 -- Touch screen XPUL
> - * CH3 -- Touch screen YPLL
> - * CH4 -- Touch screen XNUL
> - * CH5 -- Touch screen YNLR
> - * CH6 -- Touch screen WIPER (5-wire only)
> - *
> - * The bit fields below represents which parts of the LRADC block are
> - * switched into special mode of operation. These channels can not
> - * be sampled as regular LRADC channels. The driver will refuse any
> - * attempt to sample these channels.
> - */
> -#define CHAN_MASK_TOUCHBUTTON (BIT(1) | BIT(0))
> -#define CHAN_MASK_TOUCHSCREEN_4WIRE (0xf << 2)
> -#define CHAN_MASK_TOUCHSCREEN_5WIRE (0x1f << 2)
> - enum mxs_lradc_ts use_touchscreen;
> - bool use_touchbutton;
> -
> - struct input_dev *ts_input;
> -
> - enum mxs_lradc_id soc;
> - enum lradc_ts_plate cur_plate; /* state machine */
> - bool ts_valid;
> - unsigned ts_x_pos;
> - unsigned ts_y_pos;
> - unsigned ts_pressure;
> -
> - /* handle touchscreen's physical behaviour */
> - /* samples per coordinate */
> - unsigned over_sample_cnt;
> - /* time clocks between samples */
> - unsigned over_sample_delay;
> - /* time in clocks to wait after the plates where switched */
> - unsigned settling_delay;
> -};
> -
> -#define LRADC_CTRL0 0x00
> -# define LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE BIT(23)
> -# define LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE BIT(22)
> -# define LRADC_CTRL0_MX28_YNNSW /* YM */ BIT(21)
> -# define LRADC_CTRL0_MX28_YPNSW /* YP */ BIT(20)
> -# define LRADC_CTRL0_MX28_YPPSW /* YP */ BIT(19)
> -# define LRADC_CTRL0_MX28_XNNSW /* XM */ BIT(18)
> -# define LRADC_CTRL0_MX28_XNPSW /* XM */ BIT(17)
> -# define LRADC_CTRL0_MX28_XPPSW /* XP */ BIT(16)
> -
> -# define LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE BIT(20)
> -# define LRADC_CTRL0_MX23_YM BIT(19)
> -# define LRADC_CTRL0_MX23_XM BIT(18)
> -# define LRADC_CTRL0_MX23_YP BIT(17)
> -# define LRADC_CTRL0_MX23_XP BIT(16)
> -
> -# define LRADC_CTRL0_MX28_PLATE_MASK \
> - (LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE | \
> - LRADC_CTRL0_MX28_YNNSW | LRADC_CTRL0_MX28_YPNSW | \
> - LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_XNNSW | \
> - LRADC_CTRL0_MX28_XNPSW | LRADC_CTRL0_MX28_XPPSW)
> -
> -# define LRADC_CTRL0_MX23_PLATE_MASK \
> - (LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE | \
> - LRADC_CTRL0_MX23_YM | LRADC_CTRL0_MX23_XM | \
> - LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_XP)
> -
> -#define LRADC_CTRL1 0x10
> -#define LRADC_CTRL1_TOUCH_DETECT_IRQ_EN BIT(24)
> -#define LRADC_CTRL1_LRADC_IRQ_EN(n) (1 << ((n) + 16))
> -#define LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK (0x1fff << 16)
> -#define LRADC_CTRL1_MX23_LRADC_IRQ_EN_MASK (0x01ff << 16)
> -#define LRADC_CTRL1_LRADC_IRQ_EN_OFFSET 16
> -#define LRADC_CTRL1_TOUCH_DETECT_IRQ BIT(8)
> -#define LRADC_CTRL1_LRADC_IRQ(n) (1 << (n))
> -#define LRADC_CTRL1_MX28_LRADC_IRQ_MASK 0x1fff
> -#define LRADC_CTRL1_MX23_LRADC_IRQ_MASK 0x01ff
> -#define LRADC_CTRL1_LRADC_IRQ_OFFSET 0
> -
> -#define LRADC_CTRL2 0x20
> -#define LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET 24
> -#define LRADC_CTRL2_TEMPSENSE_PWD BIT(15)
> -
> -#define LRADC_STATUS 0x40
> -#define LRADC_STATUS_TOUCH_DETECT_RAW BIT(0)
> -
> -#define LRADC_CH(n) (0x50 + (0x10 * (n)))
> -#define LRADC_CH_ACCUMULATE BIT(29)
> -#define LRADC_CH_NUM_SAMPLES_MASK (0x1f << 24)
> -#define LRADC_CH_NUM_SAMPLES_OFFSET 24
> -#define LRADC_CH_NUM_SAMPLES(x) \
> - ((x) << LRADC_CH_NUM_SAMPLES_OFFSET)
> -#define LRADC_CH_VALUE_MASK 0x3ffff
> -#define LRADC_CH_VALUE_OFFSET 0
> -
> -#define LRADC_DELAY(n) (0xd0 + (0x10 * (n)))
> -#define LRADC_DELAY_TRIGGER_LRADCS_MASK (0xffUL << 24)
> -#define LRADC_DELAY_TRIGGER_LRADCS_OFFSET 24
> -#define LRADC_DELAY_TRIGGER(x) \
> - (((x) << LRADC_DELAY_TRIGGER_LRADCS_OFFSET) & \
> - LRADC_DELAY_TRIGGER_LRADCS_MASK)
> -#define LRADC_DELAY_KICK BIT(20)
> -#define LRADC_DELAY_TRIGGER_DELAYS_MASK (0xf << 16)
> -#define LRADC_DELAY_TRIGGER_DELAYS_OFFSET 16
> -#define LRADC_DELAY_TRIGGER_DELAYS(x) \
> - (((x) << LRADC_DELAY_TRIGGER_DELAYS_OFFSET) & \
> - LRADC_DELAY_TRIGGER_DELAYS_MASK)
> -#define LRADC_DELAY_LOOP_COUNT_MASK (0x1f << 11)
> -#define LRADC_DELAY_LOOP_COUNT_OFFSET 11
> -#define LRADC_DELAY_LOOP(x) \
> - (((x) << LRADC_DELAY_LOOP_COUNT_OFFSET) & \
> - LRADC_DELAY_LOOP_COUNT_MASK)
> -#define LRADC_DELAY_DELAY_MASK 0x7ff
> -#define LRADC_DELAY_DELAY_OFFSET 0
> -#define LRADC_DELAY_DELAY(x) \
> - (((x) << LRADC_DELAY_DELAY_OFFSET) & \
> - LRADC_DELAY_DELAY_MASK)
> -
> -#define LRADC_CTRL4 0x140
> -#define LRADC_CTRL4_LRADCSELECT_MASK(n) (0xf << ((n) * 4))
> -#define LRADC_CTRL4_LRADCSELECT_OFFSET(n) ((n) * 4)
> -#define LRADC_CTRL4_LRADCSELECT(n, x) \
> - (((x) << LRADC_CTRL4_LRADCSELECT_OFFSET(n)) & \
> - LRADC_CTRL4_LRADCSELECT_MASK(n))
> -
> -#define LRADC_RESOLUTION 12
> -#define LRADC_SINGLE_SAMPLE_MASK ((1 << LRADC_RESOLUTION) - 1)
> -
> -static void mxs_lradc_reg_set(struct mxs_lradc *lradc, u32 val, u32 reg)
> -{
> - writel(val, lradc->base + reg + STMP_OFFSET_REG_SET);
> -}
> -
> -static void mxs_lradc_reg_clear(struct mxs_lradc *lradc, u32 val, u32 reg)
> -{
> - writel(val, lradc->base + reg + STMP_OFFSET_REG_CLR);
> -}
> -
> -static void mxs_lradc_reg_wrt(struct mxs_lradc *lradc, u32 val, u32 reg)
> -{
> - writel(val, lradc->base + reg);
> -}
> -
> -static u32 mxs_lradc_plate_mask(struct mxs_lradc *lradc)
> -{
> - if (lradc->soc == IMX23_LRADC)
> - return LRADC_CTRL0_MX23_PLATE_MASK;
> - return LRADC_CTRL0_MX28_PLATE_MASK;
> -}
> -
> -static u32 mxs_lradc_irq_en_mask(struct mxs_lradc *lradc)
> -{
> - if (lradc->soc == IMX23_LRADC)
> - return LRADC_CTRL1_MX23_LRADC_IRQ_EN_MASK;
> - return LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK;
> -}
> -
> -static u32 mxs_lradc_irq_mask(struct mxs_lradc *lradc)
> -{
> - if (lradc->soc == IMX23_LRADC)
> - return LRADC_CTRL1_MX23_LRADC_IRQ_MASK;
> - return LRADC_CTRL1_MX28_LRADC_IRQ_MASK;
> -}
> -
> -static u32 mxs_lradc_touch_detect_bit(struct mxs_lradc *lradc)
> -{
> - if (lradc->soc == IMX23_LRADC)
> - return LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE;
> - return LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE;
> -}
> -
> -static u32 mxs_lradc_drive_x_plate(struct mxs_lradc *lradc)
> -{
> - if (lradc->soc == IMX23_LRADC)
> - return LRADC_CTRL0_MX23_XP | LRADC_CTRL0_MX23_XM;
> - return LRADC_CTRL0_MX28_XPPSW | LRADC_CTRL0_MX28_XNNSW;
> -}
> -
> -static u32 mxs_lradc_drive_y_plate(struct mxs_lradc *lradc)
> -{
> - if (lradc->soc == IMX23_LRADC)
> - return LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_YM;
> - return LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_YNNSW;
> -}
> -
> -static u32 mxs_lradc_drive_pressure(struct mxs_lradc *lradc)
> -{
> - if (lradc->soc == IMX23_LRADC)
> - return LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_XM;
> - return LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_XNNSW;
> -}
> -
> -static bool mxs_lradc_check_touch_event(struct mxs_lradc *lradc)
> -{
> - return !!(readl(lradc->base + LRADC_STATUS) &
> - LRADC_STATUS_TOUCH_DETECT_RAW);
> -}
> -
> -static void mxs_lradc_map_channel(struct mxs_lradc *lradc, unsigned vch,
> - unsigned ch)
> -{
> - mxs_lradc_reg_clear(lradc, LRADC_CTRL4_LRADCSELECT_MASK(vch),
> - LRADC_CTRL4);
> - mxs_lradc_reg_set(lradc, LRADC_CTRL4_LRADCSELECT(vch, ch), LRADC_CTRL4);
> -}
> -
> -static void mxs_lradc_setup_ts_channel(struct mxs_lradc *lradc, unsigned ch)
> -{
> - /*
> - * prepare for oversampling conversion
> - *
> - * from the datasheet:
> - * "The ACCUMULATE bit in the appropriate channel register
> - * HW_LRADC_CHn must be set to 1 if NUM_SAMPLES is greater then 0;
> - * otherwise, the IRQs will not fire."
> - */
> - mxs_lradc_reg_wrt(lradc, LRADC_CH_ACCUMULATE |
> - LRADC_CH_NUM_SAMPLES(lradc->over_sample_cnt - 1),
> - LRADC_CH(ch));
> -
> - /* from the datasheet:
> - * "Software must clear this register in preparation for a
> - * multi-cycle accumulation.
> - */
> - mxs_lradc_reg_clear(lradc, LRADC_CH_VALUE_MASK, LRADC_CH(ch));
> -
> - /*
> - * prepare the delay/loop unit according to the oversampling count
> - *
> - * from the datasheet:
> - * "The DELAY fields in HW_LRADC_DELAY0, HW_LRADC_DELAY1,
> - * HW_LRADC_DELAY2, and HW_LRADC_DELAY3 must be non-zero; otherwise,
> - * the LRADC will not trigger the delay group."
> - */
> - mxs_lradc_reg_wrt(lradc, LRADC_DELAY_TRIGGER(1 << ch) |
> - LRADC_DELAY_TRIGGER_DELAYS(0) |
> - LRADC_DELAY_LOOP(lradc->over_sample_cnt - 1) |
> - LRADC_DELAY_DELAY(lradc->over_sample_delay - 1),
> - LRADC_DELAY(3));
> -
> - mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ(ch), LRADC_CTRL1);
> -
> - /*
> - * after changing the touchscreen plates setting
> - * the signals need some initial time to settle. Start the
> - * SoC's delay unit and start the conversion later
> - * and automatically.
> - */
> - mxs_lradc_reg_wrt(
> - lradc,
> - LRADC_DELAY_TRIGGER(0) | /* don't trigger ADC */
> - LRADC_DELAY_TRIGGER_DELAYS(BIT(3)) | /* trigger DELAY unit#3 */
> - LRADC_DELAY_KICK |
> - LRADC_DELAY_DELAY(lradc->settling_delay),
> - LRADC_DELAY(2));
> -}
> -
> -/*
> - * Pressure detection is special:
> - * We want to do both required measurements for the pressure detection in
> - * one turn. Use the hardware features to chain both conversions and let the
> - * hardware report one interrupt if both conversions are done
> - */
> -static void mxs_lradc_setup_ts_pressure(struct mxs_lradc *lradc, unsigned ch1,
> - unsigned ch2)
> -{
> - u32 reg;
> -
> - /*
> - * prepare for oversampling conversion
> - *
> - * from the datasheet:
> - * "The ACCUMULATE bit in the appropriate channel register
> - * HW_LRADC_CHn must be set to 1 if NUM_SAMPLES is greater then 0;
> - * otherwise, the IRQs will not fire."
> - */
> - reg = LRADC_CH_ACCUMULATE |
> - LRADC_CH_NUM_SAMPLES(lradc->over_sample_cnt - 1);
> - mxs_lradc_reg_wrt(lradc, reg, LRADC_CH(ch1));
> - mxs_lradc_reg_wrt(lradc, reg, LRADC_CH(ch2));
> -
> - /* from the datasheet:
> - * "Software must clear this register in preparation for a
> - * multi-cycle accumulation.
> - */
> - mxs_lradc_reg_clear(lradc, LRADC_CH_VALUE_MASK, LRADC_CH(ch1));
> - mxs_lradc_reg_clear(lradc, LRADC_CH_VALUE_MASK, LRADC_CH(ch2));
> -
> - /* prepare the delay/loop unit according to the oversampling count */
> - mxs_lradc_reg_wrt(
> - lradc,
> - LRADC_DELAY_TRIGGER(1 << ch1) |
> - LRADC_DELAY_TRIGGER(1 << ch2) | /* start both channels */
> - LRADC_DELAY_TRIGGER_DELAYS(0) |
> - LRADC_DELAY_LOOP(lradc->over_sample_cnt - 1) |
> - LRADC_DELAY_DELAY(lradc->over_sample_delay - 1),
> - LRADC_DELAY(3));
> -
> - mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ(ch2), LRADC_CTRL1);
> -
> - /*
> - * after changing the touchscreen plates setting
> - * the signals need some initial time to settle. Start the
> - * SoC's delay unit and start the conversion later
> - * and automatically.
> - */
> - mxs_lradc_reg_wrt(
> - lradc,
> - LRADC_DELAY_TRIGGER(0) | /* don't trigger ADC */
> - LRADC_DELAY_TRIGGER_DELAYS(BIT(3)) | /* trigger DELAY unit#3 */
> - LRADC_DELAY_KICK |
> - LRADC_DELAY_DELAY(lradc->settling_delay), LRADC_DELAY(2));
> -}
> -
> -static unsigned mxs_lradc_read_raw_channel(struct mxs_lradc *lradc,
> - unsigned channel)
> -{
> - u32 reg;
> - unsigned num_samples, val;
> -
> - reg = readl(lradc->base + LRADC_CH(channel));
> - if (reg & LRADC_CH_ACCUMULATE)
> - num_samples = lradc->over_sample_cnt;
> - else
> - num_samples = 1;
> -
> - val = (reg & LRADC_CH_VALUE_MASK) >> LRADC_CH_VALUE_OFFSET;
> - return val / num_samples;
> -}
> -
> -static unsigned mxs_lradc_read_ts_pressure(struct mxs_lradc *lradc,
> - unsigned ch1, unsigned ch2)
> -{
> - u32 reg, mask;
> - unsigned pressure, m1, m2;
> -
> - mask = LRADC_CTRL1_LRADC_IRQ(ch1) | LRADC_CTRL1_LRADC_IRQ(ch2);
> - reg = readl(lradc->base + LRADC_CTRL1) & mask;
> -
> - while (reg != mask) {
> - reg = readl(lradc->base + LRADC_CTRL1) & mask;
> - dev_dbg(lradc->dev, "One channel is still busy: %X\n", reg);
> - }
> -
> - m1 = mxs_lradc_read_raw_channel(lradc, ch1);
> - m2 = mxs_lradc_read_raw_channel(lradc, ch2);
> -
> - if (m2 == 0) {
> - dev_warn(lradc->dev, "Cannot calculate pressure\n");
> - return 1 << (LRADC_RESOLUTION - 1);
> - }
> -
> - /* simply scale the value from 0 ... max ADC resolution */
> - pressure = m1;
> - pressure *= (1 << LRADC_RESOLUTION);
> - pressure /= m2;
> -
> - dev_dbg(lradc->dev, "Pressure = %u\n", pressure);
> - return pressure;
> -}
> -
> -#define TS_CH_XP 2
> -#define TS_CH_YP 3
> -#define TS_CH_XM 4
> -#define TS_CH_YM 5
> -
> -/*
> - * YP(open)--+-------------+
> - * | |--+
> - * | | |
> - * YM(-)--+-------------+ |
> - * +--------------+
> - * | |
> - * XP(weak+) XM(open)
> - *
> - * "weak+" means 200k Ohm VDDIO
> - * (-) means GND
> - */
> -static void mxs_lradc_setup_touch_detection(struct mxs_lradc *lradc)
> -{
> - /*
> - * In order to detect a touch event the 'touch detect enable' bit
> - * enables:
> - * - a weak pullup to the X+ connector
> - * - a strong ground at the Y- connector
> - */
> - mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0);
> - mxs_lradc_reg_set(lradc, mxs_lradc_touch_detect_bit(lradc),
> - LRADC_CTRL0);
> -}
> -
> -/*
> - * YP(meas)--+-------------+
> - * | |--+
> - * | | |
> - * YM(open)--+-------------+ |
> - * +--------------+
> - * | |
> - * XP(+) XM(-)
> - *
> - * (+) means here 1.85 V
> - * (-) means here GND
> - */
> -static void mxs_lradc_prepare_x_pos(struct mxs_lradc *lradc)
> -{
> - mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0);
> - mxs_lradc_reg_set(lradc, mxs_lradc_drive_x_plate(lradc), LRADC_CTRL0);
> -
> - lradc->cur_plate = LRADC_SAMPLE_X;
> - mxs_lradc_map_channel(lradc, TOUCHSCREEN_VCHANNEL1, TS_CH_YP);
> - mxs_lradc_setup_ts_channel(lradc, TOUCHSCREEN_VCHANNEL1);
> -}
> -
> -/*
> - * YP(+)--+-------------+
> - * | |--+
> - * | | |
> - * YM(-)--+-------------+ |
> - * +--------------+
> - * | |
> - * XP(open) XM(meas)
> - *
> - * (+) means here 1.85 V
> - * (-) means here GND
> - */
> -static void mxs_lradc_prepare_y_pos(struct mxs_lradc *lradc)
> -{
> - mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0);
> - mxs_lradc_reg_set(lradc, mxs_lradc_drive_y_plate(lradc), LRADC_CTRL0);
> -
> - lradc->cur_plate = LRADC_SAMPLE_Y;
> - mxs_lradc_map_channel(lradc, TOUCHSCREEN_VCHANNEL1, TS_CH_XM);
> - mxs_lradc_setup_ts_channel(lradc, TOUCHSCREEN_VCHANNEL1);
> -}
> -
> -/*
> - * YP(+)--+-------------+
> - * | |--+
> - * | | |
> - * YM(meas)--+-------------+ |
> - * +--------------+
> - * | |
> - * XP(meas) XM(-)
> - *
> - * (+) means here 1.85 V
> - * (-) means here GND
> - */
> -static void mxs_lradc_prepare_pressure(struct mxs_lradc *lradc)
> -{
> - mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0);
> - mxs_lradc_reg_set(lradc, mxs_lradc_drive_pressure(lradc), LRADC_CTRL0);
> -
> - lradc->cur_plate = LRADC_SAMPLE_PRESSURE;
> - mxs_lradc_map_channel(lradc, TOUCHSCREEN_VCHANNEL1, TS_CH_YM);
> - mxs_lradc_map_channel(lradc, TOUCHSCREEN_VCHANNEL2, TS_CH_XP);
> - mxs_lradc_setup_ts_pressure(lradc, TOUCHSCREEN_VCHANNEL2,
> - TOUCHSCREEN_VCHANNEL1);
> -}
> -
> -static void mxs_lradc_enable_touch_detection(struct mxs_lradc *lradc)
> -{
> - mxs_lradc_setup_touch_detection(lradc);
> -
> - lradc->cur_plate = LRADC_TOUCH;
> - mxs_lradc_reg_clear(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ |
> - LRADC_CTRL1_TOUCH_DETECT_IRQ_EN, LRADC_CTRL1);
> - mxs_lradc_reg_set(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ_EN, LRADC_CTRL1);
> -}
> -
> -static void mxs_lradc_start_touch_event(struct mxs_lradc *lradc)
> -{
> - mxs_lradc_reg_clear(lradc,
> - LRADC_CTRL1_TOUCH_DETECT_IRQ_EN,
> - LRADC_CTRL1);
> - mxs_lradc_reg_set(lradc,
> - LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL1),
> - LRADC_CTRL1);
> - /*
> - * start with the Y-pos, because it uses nearly the same plate
> - * settings like the touch detection
> - */
> - mxs_lradc_prepare_y_pos(lradc);
> -}
> -
> -static void mxs_lradc_report_ts_event(struct mxs_lradc *lradc)
> -{
> - input_report_abs(lradc->ts_input, ABS_X, lradc->ts_x_pos);
> - input_report_abs(lradc->ts_input, ABS_Y, lradc->ts_y_pos);
> - input_report_abs(lradc->ts_input, ABS_PRESSURE, lradc->ts_pressure);
> - input_report_key(lradc->ts_input, BTN_TOUCH, 1);
> - input_sync(lradc->ts_input);
> -}
> -
> -static void mxs_lradc_complete_touch_event(struct mxs_lradc *lradc)
> -{
> - mxs_lradc_setup_touch_detection(lradc);
> - lradc->cur_plate = LRADC_SAMPLE_VALID;
> - /*
> - * start a dummy conversion to burn time to settle the signals
> - * note: we are not interested in the conversion's value
> - */
> - mxs_lradc_reg_wrt(lradc, 0, LRADC_CH(TOUCHSCREEN_VCHANNEL1));
> - mxs_lradc_reg_clear(lradc,
> - LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1) |
> - LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL2),
> - LRADC_CTRL1);
> - mxs_lradc_reg_wrt(
> - lradc,
> - LRADC_DELAY_TRIGGER(1 << TOUCHSCREEN_VCHANNEL1) |
> - LRADC_DELAY_KICK | LRADC_DELAY_DELAY(10), /* waste 5 ms */
> - LRADC_DELAY(2));
> -}
> -
> -/*
> - * in order to avoid false measurements, report only samples where
> - * the surface is still touched after the position measurement
> - */
> -static void mxs_lradc_finish_touch_event(struct mxs_lradc *lradc, bool valid)
> -{
> - /* if it is still touched, report the sample */
> - if (valid && mxs_lradc_check_touch_event(lradc)) {
> - lradc->ts_valid = true;
> - mxs_lradc_report_ts_event(lradc);
> - }
> -
> - /* if it is even still touched, continue with the next measurement */
> - if (mxs_lradc_check_touch_event(lradc)) {
> - mxs_lradc_prepare_y_pos(lradc);
> - return;
> - }
> -
> - if (lradc->ts_valid) {
> - /* signal the release */
> - lradc->ts_valid = false;
> - input_report_key(lradc->ts_input, BTN_TOUCH, 0);
> - input_sync(lradc->ts_input);
> - }
> -
> - /* if it is released, wait for the next touch via IRQ */
> - lradc->cur_plate = LRADC_TOUCH;
> - mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(2));
> - mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(3));
> - mxs_lradc_reg_clear(lradc,
> - LRADC_CTRL1_TOUCH_DETECT_IRQ |
> - LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL1) |
> - LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1),
> - LRADC_CTRL1);
> - mxs_lradc_reg_set(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ_EN, LRADC_CTRL1);
> -}
> -
> -/* touchscreen's state machine */
> -static void mxs_lradc_handle_touch(struct mxs_lradc *lradc)
> -{
> - switch (lradc->cur_plate) {
> - case LRADC_TOUCH:
> - if (mxs_lradc_check_touch_event(lradc))
> - mxs_lradc_start_touch_event(lradc);
> - mxs_lradc_reg_clear(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ,
> - LRADC_CTRL1);
> - return;
> -
> - case LRADC_SAMPLE_Y:
> - lradc->ts_y_pos =
> - mxs_lradc_read_raw_channel(lradc,
> - TOUCHSCREEN_VCHANNEL1);
> - mxs_lradc_prepare_x_pos(lradc);
> - return;
> -
> - case LRADC_SAMPLE_X:
> - lradc->ts_x_pos =
> - mxs_lradc_read_raw_channel(lradc,
> - TOUCHSCREEN_VCHANNEL1);
> - mxs_lradc_prepare_pressure(lradc);
> - return;
> -
> - case LRADC_SAMPLE_PRESSURE:
> - lradc->ts_pressure =
> - mxs_lradc_read_ts_pressure(lradc,
> - TOUCHSCREEN_VCHANNEL2,
> - TOUCHSCREEN_VCHANNEL1);
> - mxs_lradc_complete_touch_event(lradc);
> - return;
> -
> - case LRADC_SAMPLE_VALID:
> - mxs_lradc_finish_touch_event(lradc, 1);
> - break;
> - }
> -}
> -
> -/*
> - * Raw I/O operations
> - */
> -static int mxs_lradc_read_single(struct iio_dev *iio_dev, int chan, int *val)
> -{
> - struct mxs_lradc *lradc = iio_priv(iio_dev);
> - int ret;
> -
> - /*
> - * See if there is no buffered operation in progress. If there is, simply
> - * bail out. This can be improved to support both buffered and raw IO at
> - * the same time, yet the code becomes horribly complicated. Therefore I
> - * applied KISS principle here.
> - */
> - ret = mutex_trylock(&lradc->lock);
> - if (!ret)
> - return -EBUSY;
> -
> - reinit_completion(&lradc->completion);
> -
> - /*
> - * No buffered operation in progress, map the channel and trigger it.
> - * Virtual channel 0 is always used here as the others are always not
> - * used if doing raw sampling.
> - */
> - if (lradc->soc == IMX28_LRADC)
> - mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ_EN(0),
> - LRADC_CTRL1);
> - mxs_lradc_reg_clear(lradc, 0x1, LRADC_CTRL0);
> -
> - /* Enable / disable the divider per requirement */
> - if (test_bit(chan, &lradc->is_divided))
> - mxs_lradc_reg_set(lradc,
> - 1 << LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET,
> - LRADC_CTRL2);
> - else
> - mxs_lradc_reg_clear(lradc,
> - 1 << LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET,
> - LRADC_CTRL2);
> -
> - /* Clean the slot's previous content, then set new one. */
> - mxs_lradc_reg_clear(lradc, LRADC_CTRL4_LRADCSELECT_MASK(0),
> - LRADC_CTRL4);
> - mxs_lradc_reg_set(lradc, chan, LRADC_CTRL4);
> -
> - mxs_lradc_reg_wrt(lradc, 0, LRADC_CH(0));
> -
> - /* Enable the IRQ and start sampling the channel. */
> - mxs_lradc_reg_set(lradc, LRADC_CTRL1_LRADC_IRQ_EN(0), LRADC_CTRL1);
> - mxs_lradc_reg_set(lradc, BIT(0), LRADC_CTRL0);
> -
> - /* Wait for completion on the channel, 1 second max. */
> - ret = wait_for_completion_killable_timeout(&lradc->completion, HZ);
> - if (!ret)
> - ret = -ETIMEDOUT;
> - if (ret < 0)
> - goto err;
> -
> - /* Read the data. */
> - *val = readl(lradc->base + LRADC_CH(0)) & LRADC_CH_VALUE_MASK;
> - ret = IIO_VAL_INT;
> -
> -err:
> - mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ_EN(0), LRADC_CTRL1);
> -
> - mutex_unlock(&lradc->lock);
> -
> - return ret;
> -}
> -
> -static int mxs_lradc_read_temp(struct iio_dev *iio_dev, int *val)
> -{
> - int ret, min, max;
> -
> - ret = mxs_lradc_read_single(iio_dev, 8, &min);
> - if (ret != IIO_VAL_INT)
> - return ret;
> -
> - ret = mxs_lradc_read_single(iio_dev, 9, &max);
> - if (ret != IIO_VAL_INT)
> - return ret;
> -
> - *val = max - min;
> -
> - return IIO_VAL_INT;
> -}
> -
> -static int mxs_lradc_read_raw(struct iio_dev *iio_dev,
> - const struct iio_chan_spec *chan,
> - int *val, int *val2, long m)
> -{
> - struct mxs_lradc *lradc = iio_priv(iio_dev);
> -
> - switch (m) {
> - case IIO_CHAN_INFO_RAW:
> - if (chan->type == IIO_TEMP)
> - return mxs_lradc_read_temp(iio_dev, val);
> -
> - return mxs_lradc_read_single(iio_dev, chan->channel, val);
> -
> - case IIO_CHAN_INFO_SCALE:
> - if (chan->type == IIO_TEMP) {
> - /* From the datasheet, we have to multiply by 1.012 and
> - * divide by 4
> - */
> - *val = 0;
> - *val2 = 253000;
> - return IIO_VAL_INT_PLUS_MICRO;
> - }
> -
> - *val = lradc->vref_mv[chan->channel];
> - *val2 = chan->scan_type.realbits -
> - test_bit(chan->channel, &lradc->is_divided);
> - return IIO_VAL_FRACTIONAL_LOG2;
> -
> - case IIO_CHAN_INFO_OFFSET:
> - if (chan->type == IIO_TEMP) {
> - /* The calculated value from the ADC is in Kelvin, we
> - * want Celsius for hwmon so the offset is -273.15
> - * The offset is applied before scaling so it is
> - * actually -213.15 * 4 / 1.012 = -1079.644268
> - */
> - *val = -1079;
> - *val2 = 644268;
> -
> - return IIO_VAL_INT_PLUS_MICRO;
> - }
> -
> - return -EINVAL;
> -
> - default:
> - break;
> - }
> -
> - return -EINVAL;
> -}
> -
> -static int mxs_lradc_write_raw(struct iio_dev *iio_dev,
> - const struct iio_chan_spec *chan,
> - int val, int val2, long m)
> -{
> - struct mxs_lradc *lradc = iio_priv(iio_dev);
> - struct mxs_lradc_scale *scale_avail =
> - lradc->scale_avail[chan->channel];
> - int ret;
> -
> - ret = mutex_trylock(&lradc->lock);
> - if (!ret)
> - return -EBUSY;
> -
> - switch (m) {
> - case IIO_CHAN_INFO_SCALE:
> - ret = -EINVAL;
> - if (val == scale_avail[MXS_LRADC_DIV_DISABLED].integer &&
> - val2 == scale_avail[MXS_LRADC_DIV_DISABLED].nano) {
> - /* divider by two disabled */
> - clear_bit(chan->channel, &lradc->is_divided);
> - ret = 0;
> - } else if (val == scale_avail[MXS_LRADC_DIV_ENABLED].integer &&
> - val2 == scale_avail[MXS_LRADC_DIV_ENABLED].nano) {
> - /* divider by two enabled */
> - set_bit(chan->channel, &lradc->is_divided);
> - ret = 0;
> - }
> -
> - break;
> - default:
> - ret = -EINVAL;
> - break;
> - }
> -
> - mutex_unlock(&lradc->lock);
> -
> - return ret;
> -}
> -
> -static int mxs_lradc_write_raw_get_fmt(struct iio_dev *iio_dev,
> - const struct iio_chan_spec *chan,
> - long m)
> -{
> - return IIO_VAL_INT_PLUS_NANO;
> -}
> -
> -static ssize_t mxs_lradc_show_scale_available_ch(struct device *dev,
> - struct device_attribute *attr,
> - char *buf,
> - int ch)
> -{
> - struct iio_dev *iio = dev_to_iio_dev(dev);
> - struct mxs_lradc *lradc = iio_priv(iio);
> - int i, len = 0;
> -
> - for (i = 0; i < ARRAY_SIZE(lradc->scale_avail[ch]); i++)
> - len += sprintf(buf + len, "%u.%09u ",
> - lradc->scale_avail[ch][i].integer,
> - lradc->scale_avail[ch][i].nano);
> -
> - len += sprintf(buf + len, "\n");
> -
> - return len;
> -}
> -
> -static ssize_t mxs_lradc_show_scale_available(struct device *dev,
> - struct device_attribute *attr,
> - char *buf)
> -{
> - struct iio_dev_attr *iio_attr = to_iio_dev_attr(attr);
> -
> - return mxs_lradc_show_scale_available_ch(dev, attr, buf,
> - iio_attr->address);
> -}
> -
> -#define SHOW_SCALE_AVAILABLE_ATTR(ch) \
> -static IIO_DEVICE_ATTR(in_voltage##ch##_scale_available, S_IRUGO, \
> - mxs_lradc_show_scale_available, NULL, ch)
> -
> -SHOW_SCALE_AVAILABLE_ATTR(0);
> -SHOW_SCALE_AVAILABLE_ATTR(1);
> -SHOW_SCALE_AVAILABLE_ATTR(2);
> -SHOW_SCALE_AVAILABLE_ATTR(3);
> -SHOW_SCALE_AVAILABLE_ATTR(4);
> -SHOW_SCALE_AVAILABLE_ATTR(5);
> -SHOW_SCALE_AVAILABLE_ATTR(6);
> -SHOW_SCALE_AVAILABLE_ATTR(7);
> -SHOW_SCALE_AVAILABLE_ATTR(10);
> -SHOW_SCALE_AVAILABLE_ATTR(11);
> -SHOW_SCALE_AVAILABLE_ATTR(12);
> -SHOW_SCALE_AVAILABLE_ATTR(13);
> -SHOW_SCALE_AVAILABLE_ATTR(14);
> -SHOW_SCALE_AVAILABLE_ATTR(15);
> -
> -static struct attribute *mxs_lradc_attributes[] = {
> - &iio_dev_attr_in_voltage0_scale_available.dev_attr.attr,
> - &iio_dev_attr_in_voltage1_scale_available.dev_attr.attr,
> - &iio_dev_attr_in_voltage2_scale_available.dev_attr.attr,
> - &iio_dev_attr_in_voltage3_scale_available.dev_attr.attr,
> - &iio_dev_attr_in_voltage4_scale_available.dev_attr.attr,
> - &iio_dev_attr_in_voltage5_scale_available.dev_attr.attr,
> - &iio_dev_attr_in_voltage6_scale_available.dev_attr.attr,
> - &iio_dev_attr_in_voltage7_scale_available.dev_attr.attr,
> - &iio_dev_attr_in_voltage10_scale_available.dev_attr.attr,
> - &iio_dev_attr_in_voltage11_scale_available.dev_attr.attr,
> - &iio_dev_attr_in_voltage12_scale_available.dev_attr.attr,
> - &iio_dev_attr_in_voltage13_scale_available.dev_attr.attr,
> - &iio_dev_attr_in_voltage14_scale_available.dev_attr.attr,
> - &iio_dev_attr_in_voltage15_scale_available.dev_attr.attr,
> - NULL
> -};
> -
> -static const struct attribute_group mxs_lradc_attribute_group = {
> - .attrs = mxs_lradc_attributes,
> -};
> -
> -static const struct iio_info mxs_lradc_iio_info = {
> - .driver_module = THIS_MODULE,
> - .read_raw = mxs_lradc_read_raw,
> - .write_raw = mxs_lradc_write_raw,
> - .write_raw_get_fmt = mxs_lradc_write_raw_get_fmt,
> - .attrs = &mxs_lradc_attribute_group,
> -};
> -
> -static int mxs_lradc_ts_open(struct input_dev *dev)
> -{
> - struct mxs_lradc *lradc = input_get_drvdata(dev);
> -
> - /* Enable the touch-detect circuitry. */
> - mxs_lradc_enable_touch_detection(lradc);
> -
> - return 0;
> -}
> -
> -static void mxs_lradc_disable_ts(struct mxs_lradc *lradc)
> -{
> - /* stop all interrupts from firing */
> - mxs_lradc_reg_clear(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ_EN |
> - LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL1) |
> - LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL2), LRADC_CTRL1);
> -
> - /* Power-down touchscreen touch-detect circuitry. */
> - mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0);
> -}
> -
> -static void mxs_lradc_ts_close(struct input_dev *dev)
> -{
> - struct mxs_lradc *lradc = input_get_drvdata(dev);
> -
> - mxs_lradc_disable_ts(lradc);
> -}
> -
> -static int mxs_lradc_ts_register(struct mxs_lradc *lradc)
> -{
> - struct input_dev *input;
> - struct device *dev = lradc->dev;
> - int ret;
> -
> - if (!lradc->use_touchscreen)
> - return 0;
> -
> - input = input_allocate_device();
> - if (!input)
> - return -ENOMEM;
> -
> - input->name = DRIVER_NAME;
> - input->id.bustype = BUS_HOST;
> - input->dev.parent = dev;
> - input->open = mxs_lradc_ts_open;
> - input->close = mxs_lradc_ts_close;
> -
> - __set_bit(EV_ABS, input->evbit);
> - __set_bit(EV_KEY, input->evbit);
> - __set_bit(BTN_TOUCH, input->keybit);
> - input_set_abs_params(input, ABS_X, 0, LRADC_SINGLE_SAMPLE_MASK, 0, 0);
> - input_set_abs_params(input, ABS_Y, 0, LRADC_SINGLE_SAMPLE_MASK, 0, 0);
> - input_set_abs_params(input, ABS_PRESSURE, 0, LRADC_SINGLE_SAMPLE_MASK,
> - 0, 0);
> -
> - lradc->ts_input = input;
> - input_set_drvdata(input, lradc);
> - ret = input_register_device(input);
> - if (ret)
> - input_free_device(lradc->ts_input);
> -
> - return ret;
> -}
> -
> -static void mxs_lradc_ts_unregister(struct mxs_lradc *lradc)
> -{
> - if (!lradc->use_touchscreen)
> - return;
> -
> - mxs_lradc_disable_ts(lradc);
> - input_unregister_device(lradc->ts_input);
> -}
> -
> -/*
> - * IRQ Handling
> - */
> -static irqreturn_t mxs_lradc_handle_irq(int irq, void *data)
> -{
> - struct iio_dev *iio = data;
> - struct mxs_lradc *lradc = iio_priv(iio);
> - unsigned long reg = readl(lradc->base + LRADC_CTRL1);
> - u32 clr_irq = mxs_lradc_irq_mask(lradc);
> - const u32 ts_irq_mask =
> - LRADC_CTRL1_TOUCH_DETECT_IRQ |
> - LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1) |
> - LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL2);
> -
> - if (!(reg & mxs_lradc_irq_mask(lradc)))
> - return IRQ_NONE;
> -
> - if (lradc->use_touchscreen && (reg & ts_irq_mask)) {
> - mxs_lradc_handle_touch(lradc);
> -
> - /* Make sure we don't clear the next conversion's interrupt. */
> - clr_irq &= ~(LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1) |
> - LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL2));
> - }
> -
> - if (iio_buffer_enabled(iio)) {
> - if (reg & lradc->buffer_vchans)
> - iio_trigger_poll(iio->trig);
> - } else if (reg & LRADC_CTRL1_LRADC_IRQ(0)) {
> - complete(&lradc->completion);
> - }
> -
> - mxs_lradc_reg_clear(lradc, reg & clr_irq, LRADC_CTRL1);
> -
> - return IRQ_HANDLED;
> -}
> -
> -/*
> - * Trigger handling
> - */
> -static irqreturn_t mxs_lradc_trigger_handler(int irq, void *p)
> -{
> - struct iio_poll_func *pf = p;
> - struct iio_dev *iio = pf->indio_dev;
> - struct mxs_lradc *lradc = iio_priv(iio);
> - const u32 chan_value = LRADC_CH_ACCUMULATE |
> - ((LRADC_DELAY_TIMER_LOOP - 1) << LRADC_CH_NUM_SAMPLES_OFFSET);
> - unsigned int i, j = 0;
> -
> - for_each_set_bit(i, iio->active_scan_mask, LRADC_MAX_TOTAL_CHANS) {
> - lradc->buffer[j] = readl(lradc->base + LRADC_CH(j));
> - mxs_lradc_reg_wrt(lradc, chan_value, LRADC_CH(j));
> - lradc->buffer[j] &= LRADC_CH_VALUE_MASK;
> - lradc->buffer[j] /= LRADC_DELAY_TIMER_LOOP;
> - j++;
> - }
> -
> - iio_push_to_buffers_with_timestamp(iio, lradc->buffer, pf->timestamp);
> -
> - iio_trigger_notify_done(iio->trig);
> -
> - return IRQ_HANDLED;
> -}
> -
> -static int mxs_lradc_configure_trigger(struct iio_trigger *trig, bool state)
> -{
> - struct iio_dev *iio = iio_trigger_get_drvdata(trig);
> - struct mxs_lradc *lradc = iio_priv(iio);
> - const u32 st = state ? STMP_OFFSET_REG_SET : STMP_OFFSET_REG_CLR;
> -
> - mxs_lradc_reg_wrt(lradc, LRADC_DELAY_KICK, LRADC_DELAY(0) + st);
> -
> - return 0;
> -}
> -
> -static const struct iio_trigger_ops mxs_lradc_trigger_ops = {
> - .owner = THIS_MODULE,
> - .set_trigger_state = &mxs_lradc_configure_trigger,
> -};
> -
> -static int mxs_lradc_trigger_init(struct iio_dev *iio)
> -{
> - int ret;
> - struct iio_trigger *trig;
> - struct mxs_lradc *lradc = iio_priv(iio);
> -
> - trig = iio_trigger_alloc("%s-dev%i", iio->name, iio->id);
> - if (!trig)
> - return -ENOMEM;
> -
> - trig->dev.parent = lradc->dev;
> - iio_trigger_set_drvdata(trig, iio);
> - trig->ops = &mxs_lradc_trigger_ops;
> -
> - ret = iio_trigger_register(trig);
> - if (ret) {
> - iio_trigger_free(trig);
> - return ret;
> - }
> -
> - lradc->trig = trig;
> -
> - return 0;
> -}
> -
> -static void mxs_lradc_trigger_remove(struct iio_dev *iio)
> -{
> - struct mxs_lradc *lradc = iio_priv(iio);
> -
> - iio_trigger_unregister(lradc->trig);
> - iio_trigger_free(lradc->trig);
> -}
> -
> -static int mxs_lradc_buffer_preenable(struct iio_dev *iio)
> -{
> - struct mxs_lradc *lradc = iio_priv(iio);
> - int ret = 0, chan, ofs = 0;
> - unsigned long enable = 0;
> - u32 ctrl4_set = 0;
> - u32 ctrl4_clr = 0;
> - u32 ctrl1_irq = 0;
> - const u32 chan_value = LRADC_CH_ACCUMULATE |
> - ((LRADC_DELAY_TIMER_LOOP - 1) << LRADC_CH_NUM_SAMPLES_OFFSET);
> - const int len = bitmap_weight(iio->active_scan_mask,
> - LRADC_MAX_TOTAL_CHANS);
> -
> - if (!len)
> - return -EINVAL;
> -
> - /*
> - * Lock the driver so raw access can not be done during buffered
> - * operation. This simplifies the code a lot.
> - */
> - ret = mutex_trylock(&lradc->lock);
> - if (!ret)
> - return -EBUSY;
> -
> - lradc->buffer = kmalloc_array(len, sizeof(*lradc->buffer), GFP_KERNEL);
> - if (!lradc->buffer) {
> - ret = -ENOMEM;
> - goto err_mem;
> - }
> -
> - if (lradc->soc == IMX28_LRADC)
> - mxs_lradc_reg_clear(
> - lradc,
> - lradc->buffer_vchans << LRADC_CTRL1_LRADC_IRQ_EN_OFFSET,
> - LRADC_CTRL1);
> - mxs_lradc_reg_clear(lradc, lradc->buffer_vchans, LRADC_CTRL0);
> -
> - for_each_set_bit(chan, iio->active_scan_mask, LRADC_MAX_TOTAL_CHANS) {
> - ctrl4_set |= chan << LRADC_CTRL4_LRADCSELECT_OFFSET(ofs);
> - ctrl4_clr |= LRADC_CTRL4_LRADCSELECT_MASK(ofs);
> - ctrl1_irq |= LRADC_CTRL1_LRADC_IRQ_EN(ofs);
> - mxs_lradc_reg_wrt(lradc, chan_value, LRADC_CH(ofs));
> - bitmap_set(&enable, ofs, 1);
> - ofs++;
> - }
> -
> - mxs_lradc_reg_clear(lradc, LRADC_DELAY_TRIGGER_LRADCS_MASK |
> - LRADC_DELAY_KICK, LRADC_DELAY(0));
> - mxs_lradc_reg_clear(lradc, ctrl4_clr, LRADC_CTRL4);
> - mxs_lradc_reg_set(lradc, ctrl4_set, LRADC_CTRL4);
> - mxs_lradc_reg_set(lradc, ctrl1_irq, LRADC_CTRL1);
> - mxs_lradc_reg_set(lradc, enable << LRADC_DELAY_TRIGGER_LRADCS_OFFSET,
> - LRADC_DELAY(0));
> -
> - return 0;
> -
> -err_mem:
> - mutex_unlock(&lradc->lock);
> - return ret;
> -}
> -
> -static int mxs_lradc_buffer_postdisable(struct iio_dev *iio)
> -{
> - struct mxs_lradc *lradc = iio_priv(iio);
> -
> - mxs_lradc_reg_clear(lradc, LRADC_DELAY_TRIGGER_LRADCS_MASK |
> - LRADC_DELAY_KICK, LRADC_DELAY(0));
> -
> - mxs_lradc_reg_clear(lradc, lradc->buffer_vchans, LRADC_CTRL0);
> - if (lradc->soc == IMX28_LRADC)
> - mxs_lradc_reg_clear(
> - lradc,
> - lradc->buffer_vchans << LRADC_CTRL1_LRADC_IRQ_EN_OFFSET,
> - LRADC_CTRL1);
> -
> - kfree(lradc->buffer);
> - mutex_unlock(&lradc->lock);
> -
> - return 0;
> -}
> -
> -static bool mxs_lradc_validate_scan_mask(struct iio_dev *iio,
> - const unsigned long *mask)
> -{
> - struct mxs_lradc *lradc = iio_priv(iio);
> - const int map_chans = bitmap_weight(mask, LRADC_MAX_TOTAL_CHANS);
> - int rsvd_chans = 0;
> - unsigned long rsvd_mask = 0;
> -
> - if (lradc->use_touchbutton)
> - rsvd_mask |= CHAN_MASK_TOUCHBUTTON;
> - if (lradc->use_touchscreen == MXS_LRADC_TOUCHSCREEN_4WIRE)
> - rsvd_mask |= CHAN_MASK_TOUCHSCREEN_4WIRE;
> - if (lradc->use_touchscreen == MXS_LRADC_TOUCHSCREEN_5WIRE)
> - rsvd_mask |= CHAN_MASK_TOUCHSCREEN_5WIRE;
> -
> - if (lradc->use_touchbutton)
> - rsvd_chans++;
> - if (lradc->use_touchscreen)
> - rsvd_chans += 2;
> -
> - /* Test for attempts to map channels with special mode of operation. */
> - if (bitmap_intersects(mask, &rsvd_mask, LRADC_MAX_TOTAL_CHANS))
> - return false;
> -
> - /* Test for attempts to map more channels then available slots. */
> - if (map_chans + rsvd_chans > LRADC_MAX_MAPPED_CHANS)
> - return false;
> -
> - return true;
> -}
> -
> -static const struct iio_buffer_setup_ops mxs_lradc_buffer_ops = {
> - .preenable = &mxs_lradc_buffer_preenable,
> - .postenable = &iio_triggered_buffer_postenable,
> - .predisable = &iio_triggered_buffer_predisable,
> - .postdisable = &mxs_lradc_buffer_postdisable,
> - .validate_scan_mask = &mxs_lradc_validate_scan_mask,
> -};
> -
> -/*
> - * Driver initialization
> - */
> -
> -#define MXS_ADC_CHAN(idx, chan_type, name) { \
> - .type = (chan_type), \
> - .indexed = 1, \
> - .scan_index = (idx), \
> - .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
> - BIT(IIO_CHAN_INFO_SCALE), \
> - .channel = (idx), \
> - .address = (idx), \
> - .scan_type = { \
> - .sign = 'u', \
> - .realbits = LRADC_RESOLUTION, \
> - .storagebits = 32, \
> - }, \
> - .datasheet_name = (name), \
> -}
> -
> -static const struct iio_chan_spec mx23_lradc_chan_spec[] = {
> - MXS_ADC_CHAN(0, IIO_VOLTAGE, "LRADC0"),
> - MXS_ADC_CHAN(1, IIO_VOLTAGE, "LRADC1"),
> - MXS_ADC_CHAN(2, IIO_VOLTAGE, "LRADC2"),
> - MXS_ADC_CHAN(3, IIO_VOLTAGE, "LRADC3"),
> - MXS_ADC_CHAN(4, IIO_VOLTAGE, "LRADC4"),
> - MXS_ADC_CHAN(5, IIO_VOLTAGE, "LRADC5"),
> - MXS_ADC_CHAN(6, IIO_VOLTAGE, "VDDIO"),
> - MXS_ADC_CHAN(7, IIO_VOLTAGE, "VBATT"),
> - /* Combined Temperature sensors */
> - {
> - .type = IIO_TEMP,
> - .indexed = 1,
> - .scan_index = 8,
> - .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
> - BIT(IIO_CHAN_INFO_OFFSET) |
> - BIT(IIO_CHAN_INFO_SCALE),
> - .channel = 8,
> - .scan_type = {.sign = 'u', .realbits = 18, .storagebits = 32,},
> - .datasheet_name = "TEMP_DIE",
> - },
> - /* Hidden channel to keep indexes */
> - {
> - .type = IIO_TEMP,
> - .indexed = 1,
> - .scan_index = -1,
> - .channel = 9,
> - },
> - MXS_ADC_CHAN(10, IIO_VOLTAGE, NULL),
> - MXS_ADC_CHAN(11, IIO_VOLTAGE, NULL),
> - MXS_ADC_CHAN(12, IIO_VOLTAGE, "USB_DP"),
> - MXS_ADC_CHAN(13, IIO_VOLTAGE, "USB_DN"),
> - MXS_ADC_CHAN(14, IIO_VOLTAGE, "VBG"),
> - MXS_ADC_CHAN(15, IIO_VOLTAGE, "VDD5V"),
> -};
> -
> -static const struct iio_chan_spec mx28_lradc_chan_spec[] = {
> - MXS_ADC_CHAN(0, IIO_VOLTAGE, "LRADC0"),
> - MXS_ADC_CHAN(1, IIO_VOLTAGE, "LRADC1"),
> - MXS_ADC_CHAN(2, IIO_VOLTAGE, "LRADC2"),
> - MXS_ADC_CHAN(3, IIO_VOLTAGE, "LRADC3"),
> - MXS_ADC_CHAN(4, IIO_VOLTAGE, "LRADC4"),
> - MXS_ADC_CHAN(5, IIO_VOLTAGE, "LRADC5"),
> - MXS_ADC_CHAN(6, IIO_VOLTAGE, "LRADC6"),
> - MXS_ADC_CHAN(7, IIO_VOLTAGE, "VBATT"),
> - /* Combined Temperature sensors */
> - {
> - .type = IIO_TEMP,
> - .indexed = 1,
> - .scan_index = 8,
> - .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
> - BIT(IIO_CHAN_INFO_OFFSET) |
> - BIT(IIO_CHAN_INFO_SCALE),
> - .channel = 8,
> - .scan_type = {.sign = 'u', .realbits = 18, .storagebits = 32,},
> - .datasheet_name = "TEMP_DIE",
> - },
> - /* Hidden channel to keep indexes */
> - {
> - .type = IIO_TEMP,
> - .indexed = 1,
> - .scan_index = -1,
> - .channel = 9,
> - },
> - MXS_ADC_CHAN(10, IIO_VOLTAGE, "VDDIO"),
> - MXS_ADC_CHAN(11, IIO_VOLTAGE, "VTH"),
> - MXS_ADC_CHAN(12, IIO_VOLTAGE, "VDDA"),
> - MXS_ADC_CHAN(13, IIO_VOLTAGE, "VDDD"),
> - MXS_ADC_CHAN(14, IIO_VOLTAGE, "VBG"),
> - MXS_ADC_CHAN(15, IIO_VOLTAGE, "VDD5V"),
> -};
> -
> -static int mxs_lradc_hw_init(struct mxs_lradc *lradc)
> -{
> - /* The ADC always uses DELAY CHANNEL 0. */
> - const u32 adc_cfg =
> - (1 << (LRADC_DELAY_TRIGGER_DELAYS_OFFSET + 0)) |
> - (LRADC_DELAY_TIMER_PER << LRADC_DELAY_DELAY_OFFSET);
> -
> - int ret = stmp_reset_block(lradc->base);
> -
> - if (ret)
> - return ret;
> -
> - /* Configure DELAY CHANNEL 0 for generic ADC sampling. */
> - mxs_lradc_reg_wrt(lradc, adc_cfg, LRADC_DELAY(0));
> -
> - /* Disable remaining DELAY CHANNELs */
> - mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(1));
> - mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(2));
> - mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(3));
> -
> - /* Configure the touchscreen type */
> - if (lradc->soc == IMX28_LRADC) {
> - mxs_lradc_reg_clear(lradc, LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE,
> - LRADC_CTRL0);
> -
> - if (lradc->use_touchscreen == MXS_LRADC_TOUCHSCREEN_5WIRE)
> - mxs_lradc_reg_set(lradc, LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE,
> - LRADC_CTRL0);
> - }
> -
> - /* Start internal temperature sensing. */
> - mxs_lradc_reg_wrt(lradc, 0, LRADC_CTRL2);
> -
> - return 0;
> -}
> -
> -static void mxs_lradc_hw_stop(struct mxs_lradc *lradc)
> -{
> - int i;
> -
> - mxs_lradc_reg_clear(lradc, mxs_lradc_irq_en_mask(lradc), LRADC_CTRL1);
> -
> - for (i = 0; i < LRADC_MAX_DELAY_CHANS; i++)
> - mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(i));
> -}
> -
> -static const struct of_device_id mxs_lradc_dt_ids[] = {
> - { .compatible = "fsl,imx23-lradc", .data = (void *)IMX23_LRADC, },
> - { .compatible = "fsl,imx28-lradc", .data = (void *)IMX28_LRADC, },
> - { /* sentinel */ }
> -};
> -MODULE_DEVICE_TABLE(of, mxs_lradc_dt_ids);
> -
> -static int mxs_lradc_probe_touchscreen(struct mxs_lradc *lradc,
> - struct device_node *lradc_node)
> -{
> - int ret;
> - u32 ts_wires = 0, adapt;
> -
> - ret = of_property_read_u32(lradc_node, "fsl,lradc-touchscreen-wires",
> - &ts_wires);
> - if (ret)
> - return -ENODEV; /* touchscreen feature disabled */
> -
> - switch (ts_wires) {
> - case 4:
> - lradc->use_touchscreen = MXS_LRADC_TOUCHSCREEN_4WIRE;
> - break;
> - case 5:
> - if (lradc->soc == IMX28_LRADC) {
> - lradc->use_touchscreen = MXS_LRADC_TOUCHSCREEN_5WIRE;
> - break;
> - }
> - /* fall through an error message for i.MX23 */
> - default:
> - dev_err(lradc->dev,
> - "Unsupported number of touchscreen wires (%d)\n",
> - ts_wires);
> - return -EINVAL;
> - }
> -
> - if (of_property_read_u32(lradc_node, "fsl,ave-ctrl", &adapt)) {
> - lradc->over_sample_cnt = 4;
> - } else {
> - if (adapt < 1 || adapt > 32) {
> - dev_err(lradc->dev, "Invalid sample count (%u)\n",
> - adapt);
> - return -EINVAL;
> - }
> - lradc->over_sample_cnt = adapt;
> - }
> -
> - if (of_property_read_u32(lradc_node, "fsl,ave-delay", &adapt)) {
> - lradc->over_sample_delay = 2;
> - } else {
> - if (adapt < 2 || adapt > LRADC_DELAY_DELAY_MASK + 1) {
> - dev_err(lradc->dev, "Invalid sample delay (%u)\n",
> - adapt);
> - return -EINVAL;
> - }
> - lradc->over_sample_delay = adapt;
> - }
> -
> - if (of_property_read_u32(lradc_node, "fsl,settling", &adapt)) {
> - lradc->settling_delay = 10;
> - } else {
> - if (adapt < 1 || adapt > LRADC_DELAY_DELAY_MASK) {
> - dev_err(lradc->dev, "Invalid settling delay (%u)\n",
> - adapt);
> - return -EINVAL;
> - }
> - lradc->settling_delay = adapt;
> - }
> -
> - return 0;
> -}
> -
> -static int mxs_lradc_probe(struct platform_device *pdev)
> -{
> - const struct of_device_id *of_id =
> - of_match_device(mxs_lradc_dt_ids, &pdev->dev);
> - const struct mxs_lradc_of_config *of_cfg =
> - &mxs_lradc_of_config[(enum mxs_lradc_id)of_id->data];
> - struct device *dev = &pdev->dev;
> - struct device_node *node = dev->of_node;
> - struct mxs_lradc *lradc;
> - struct iio_dev *iio;
> - struct resource *iores;
> - int ret = 0, touch_ret;
> - int i, s;
> - u64 scale_uv;
> -
> - /* Allocate the IIO device. */
> - iio = devm_iio_device_alloc(dev, sizeof(*lradc));
> - if (!iio) {
> - dev_err(dev, "Failed to allocate IIO device\n");
> - return -ENOMEM;
> - }
> -
> - lradc = iio_priv(iio);
> - lradc->soc = (enum mxs_lradc_id)of_id->data;
> -
> - /* Grab the memory area */
> - iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> - lradc->dev = &pdev->dev;
> - lradc->base = devm_ioremap_resource(dev, iores);
> - if (IS_ERR(lradc->base))
> - return PTR_ERR(lradc->base);
> -
> - lradc->clk = devm_clk_get(&pdev->dev, NULL);
> - if (IS_ERR(lradc->clk)) {
> - dev_err(dev, "Failed to get the delay unit clock\n");
> - return PTR_ERR(lradc->clk);
> - }
> - ret = clk_prepare_enable(lradc->clk);
> - if (ret != 0) {
> - dev_err(dev, "Failed to enable the delay unit clock\n");
> - return ret;
> - }
> -
> - touch_ret = mxs_lradc_probe_touchscreen(lradc, node);
> -
> - if (touch_ret == 0)
> - lradc->buffer_vchans = BUFFER_VCHANS_LIMITED;
> - else
> - lradc->buffer_vchans = BUFFER_VCHANS_ALL;
> -
> - /* Grab all IRQ sources */
> - for (i = 0; i < of_cfg->irq_count; i++) {
> - lradc->irq[i] = platform_get_irq(pdev, i);
> - if (lradc->irq[i] < 0) {
> - ret = lradc->irq[i];
> - goto err_clk;
> - }
> -
> - ret = devm_request_irq(dev, lradc->irq[i],
> - mxs_lradc_handle_irq, 0,
> - of_cfg->irq_name[i], iio);
> - if (ret)
> - goto err_clk;
> - }
> -
> - lradc->vref_mv = of_cfg->vref_mv;
> -
> - platform_set_drvdata(pdev, iio);
> -
> - init_completion(&lradc->completion);
> - mutex_init(&lradc->lock);
> -
> - iio->name = pdev->name;
> - iio->dev.parent = &pdev->dev;
> - iio->info = &mxs_lradc_iio_info;
> - iio->modes = INDIO_DIRECT_MODE;
> - iio->masklength = LRADC_MAX_TOTAL_CHANS;
> -
> - if (lradc->soc == IMX23_LRADC) {
> - iio->channels = mx23_lradc_chan_spec;
> - iio->num_channels = ARRAY_SIZE(mx23_lradc_chan_spec);
> - } else {
> - iio->channels = mx28_lradc_chan_spec;
> - iio->num_channels = ARRAY_SIZE(mx28_lradc_chan_spec);
> - }
> -
> - ret = iio_triggered_buffer_setup(iio, &iio_pollfunc_store_time,
> - &mxs_lradc_trigger_handler,
> - &mxs_lradc_buffer_ops);
> - if (ret)
> - goto err_clk;
> -
> - ret = mxs_lradc_trigger_init(iio);
> - if (ret)
> - goto err_trig;
> -
> - /* Populate available ADC input ranges */
> - for (i = 0; i < LRADC_MAX_TOTAL_CHANS; i++) {
> - for (s = 0; s < ARRAY_SIZE(lradc->scale_avail[i]); s++) {
> - /*
> - * [s=0] = optional divider by two disabled (default)
> - * [s=1] = optional divider by two enabled
> - *
> - * The scale is calculated by doing:
> - * Vref >> (realbits - s)
> - * which multiplies by two on the second component
> - * of the array.
> - */
> - scale_uv = ((u64)lradc->vref_mv[i] * 100000000) >>
> - (LRADC_RESOLUTION - s);
> - lradc->scale_avail[i][s].nano =
> - do_div(scale_uv, 100000000) * 10;
> - lradc->scale_avail[i][s].integer = scale_uv;
> - }
> - }
> -
> - /* Configure the hardware. */
> - ret = mxs_lradc_hw_init(lradc);
> - if (ret)
> - goto err_dev;
> -
> - /* Register the touchscreen input device. */
> - if (touch_ret == 0) {
> - ret = mxs_lradc_ts_register(lradc);
> - if (ret)
> - goto err_ts_register;
> - }
> -
> - /* Register IIO device. */
> - ret = iio_device_register(iio);
> - if (ret) {
> - dev_err(dev, "Failed to register IIO device\n");
> - goto err_ts;
> - }
> -
> - return 0;
> -
> -err_ts:
> - mxs_lradc_ts_unregister(lradc);
> -err_ts_register:
> - mxs_lradc_hw_stop(lradc);
> -err_dev:
> - mxs_lradc_trigger_remove(iio);
> -err_trig:
> - iio_triggered_buffer_cleanup(iio);
> -err_clk:
> - clk_disable_unprepare(lradc->clk);
> - return ret;
> -}
> -
> -static int mxs_lradc_remove(struct platform_device *pdev)
> -{
> - struct iio_dev *iio = platform_get_drvdata(pdev);
> - struct mxs_lradc *lradc = iio_priv(iio);
> -
> - iio_device_unregister(iio);
> - mxs_lradc_ts_unregister(lradc);
> - mxs_lradc_hw_stop(lradc);
> - mxs_lradc_trigger_remove(iio);
> - iio_triggered_buffer_cleanup(iio);
> -
> - clk_disable_unprepare(lradc->clk);
> - return 0;
> -}
> -
> -static struct platform_driver mxs_lradc_driver = {
> - .driver = {
> - .name = DRIVER_NAME,
> - .of_match_table = mxs_lradc_dt_ids,
> - },
> - .probe = mxs_lradc_probe,
> - .remove = mxs_lradc_remove,
> -};
> -
> -module_platform_driver(mxs_lradc_driver);
> -
> -MODULE_AUTHOR("Marek Vasut <marex@...x.de>");
> -MODULE_DESCRIPTION("Freescale MXS LRADC driver");
> -MODULE_LICENSE("GPL v2");
> -MODULE_ALIAS("platform:" DRIVER_NAME);
>
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