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Message-ID: <20160610162844.GA12329@rob-hp-laptop>
Date: Fri, 10 Jun 2016 11:28:44 -0500
From: Rob Herring <robh@...nel.org>
To: Kevin Tsai <capellamicro@...il.com>
Cc: Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>,
Jonathan Cameron <jic23@...nel.org>,
Hartmut Knaack <knaack.h@....de>,
Lars-Peter Clausen <lars@...afoo.de>,
Peter Meerwald-Stadler <pmeerw@...erw.net>,
Andrew Morton <akpm@...ux-foundation.org>,
"David S. Miller" <davem@...emloft.net>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Mauro Carvalho Chehab <mchehab@....samsung.com>,
Guenter Roeck <linux@...ck-us.net>,
Jiri Slaby <jslaby@...e.cz>,
Daniel Baluta <daniel.baluta@...el.com>,
Adriana Reus <adriana.reus@...el.com>,
Andreas Dannenberg <dannenberg@...com>,
Matt Ranostay <mranostay@...il.com>,
Crestez Dan Leonard <leonard.crestez@...el.com>,
Linus Walleij <linus.walleij@...aro.org>,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-iio@...r.kernel.org, Anatol Pomazau <anatol@...gle.com>
Subject: Re: [PATCH V2 1/1] iio: light: Added CM36672 Proximity Sensor Driver.
On Thu, Jun 09, 2016 at 02:00:45AM -0700, Kevin Tsai wrote:
> Added Vishay Capella CM36672 Proximity Sensor IIO driver. Support both
> ACPI and Device Tree.
>
> Signed-off-by: Kevin Tsai <capellamicro@...il.com>
> ---
> V2:
> Thanks commends from Peter Meerwald-Stadler, Jonathan Cameron, and Linux
> Walleij. Updated for the following:
> - Remove unused defines.
> - Rewrite event registration.
> - Remove direct register values in the device tree.
> - Rewrite by regmap API.
> - Remove irq module parameter.
> - Correct cm36672_remove().
>
> .../devicetree/bindings/iio/light/cm36672.txt | 37 +
> MAINTAINERS | 4 +-
> drivers/iio/light/Kconfig | 11 +
> drivers/iio/light/Makefile | 1 +
> drivers/iio/light/cm36672.c | 820 +++++++++++++++++++++
> 5 files changed, 871 insertions(+), 2 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/iio/light/cm36672.txt
> create mode 100644 drivers/iio/light/cm36672.c
>
> diff --git a/Documentation/devicetree/bindings/iio/light/cm36672.txt b/Documentation/devicetree/bindings/iio/light/cm36672.txt
> new file mode 100644
> index 0000000..9681d2c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/light/cm36672.txt
> @@ -0,0 +1,37 @@
> +* Vishay Capella CM36672 I2C Proximity sensor
> +
> +Required properties:
> +- compatible: must be capella,cm36672"
> +- reg: the I2C slave address, usually 0x60
> +- interrupts: interrupt mapping for GPIO IRQ
> +
> +Optional properties:
> +- interrupt-parent: interrupt controller
> +- interrupts: interrupt mapping for GPIO IRQ
> +- cm36672,prx_led_current: LED current, must be one of the following values:
Correct prefix is capella, not cm36672. Use '-' not '_'.
Is this a standard property of prox sensors? If so define a common
property.
> + - 0: 50mA
> + - 1: 75mA
> + - 2: 100mA
> + - 3: 120mA
> + - 4: 140mA
> + - 5: 160mA
> + - 6: 180mA
> + - 7: 200mA
> +- cm36672,prx_hd: width of proximity sensor output data, must be one of the
> + following values:
> + - 0: 12-bit
> + - 1: 16-bit
> +
> +Example:
> +
> + cm36672@60 {
> + compatible = "capella,cm36672";
> + reg = <0x60>;
> + interrupt-parent = <&gpio0>;
> + interrupts = <30 0>;
> +
> + /* cm36672-specific properties */
> + cm36672,prx_led_current = <2>;
> + cm36672,prx_hd = <1>;
> + };
> +
> diff --git a/MAINTAINERS b/MAINTAINERS
> index ed42cb6..9618af4 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -2822,10 +2822,10 @@ F: security/commoncap.c
> F: kernel/capability.c
>
> CAPELLA MICROSYSTEMS LIGHT SENSOR DRIVER
> -M: Kevin Tsai <ktsai@...ellamicro.com>
> +M: Kevin Tsai <capellamicro@...il.com>
> S: Maintained
> F: drivers/iio/light/cm*
> -F: Documentation/devicetree/bindings/i2c/trivial-devices.txt
> +F: Documentation/devicetree/bindings/iio/light/cm*
>
> CAVIUM LIQUIDIO NETWORK DRIVER
> M: Derek Chickles <derek.chickles@...iumnetworks.com>
> diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
> index 7c566f5..cb5052a 100644
> --- a/drivers/iio/light/Kconfig
> +++ b/drivers/iio/light/Kconfig
> @@ -127,6 +127,17 @@ config CM36651
> To compile this driver as a module, choose M here:
> the module will be called cm36651.
>
> +config CM36672
> + depends on I2C
> + tristate "CM36672 driver"
> + help
> + Say Y here if you use cm36672.
> + This option enables proximity sensors using Vishay
> + Capella cm36672 device driver.
> +
> + To compile this driver as a module, choose M here:
> + the module will be called cm36672.
> +
> config GP2AP020A00F
> tristate "Sharp GP2AP020A00F Proximity/ALS sensor"
> depends on I2C
> diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile
> index 6f2a3c6..b155425 100644
> --- a/drivers/iio/light/Makefile
> +++ b/drivers/iio/light/Makefile
> @@ -14,6 +14,7 @@ obj-$(CONFIG_CM32181) += cm32181.o
> obj-$(CONFIG_CM3232) += cm3232.o
> obj-$(CONFIG_CM3323) += cm3323.o
> obj-$(CONFIG_CM36651) += cm36651.o
> +obj-$(CONFIG_CM36672) += cm36672.o
> obj-$(CONFIG_GP2AP020A00F) += gp2ap020a00f.o
> obj-$(CONFIG_HID_SENSOR_ALS) += hid-sensor-als.o
> obj-$(CONFIG_HID_SENSOR_PROX) += hid-sensor-prox.o
> diff --git a/drivers/iio/light/cm36672.c b/drivers/iio/light/cm36672.c
> new file mode 100644
> index 0000000..975629f
> --- /dev/null
> +++ b/drivers/iio/light/cm36672.c
> @@ -0,0 +1,820 @@
> +/*
> + * CM36672 Proximity Sensor
> + *
> + * Copyright (C) 2014-2016 Vishay Capella
> + * Author: Kevin Tsai <capellamicro@...il.com>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License version 2, as published
> + * by the Free Software Foundation.
> + *
> + * IIO driver for CM36672 (7-bit I2C slave address 0x60).
> + */
> +#include <linux/kernel.h>
> +#include <linux/i2c.h>
> +#include <linux/module.h>
> +#include <linux/interrupt.h>
> +#include <linux/regmap.h>
> +#include <linux/gpio.h>
> +
> +#include <linux/iio/iio.h>
> +#include <linux/iio/sysfs.h>
> +#include <linux/iio/events.h>
> +
> +#ifdef CONFIG_ACPI
> +#include <linux/acpi.h>
> +#endif
> +
> +#define CM36672_DRIVER_NAME "cm36672"
> +#define CM36672_REGMAP_NAME "cm36672_regmap"
> +
> +/* Sensor registers */
> +#define CM36672_ADDR_PRX_CONF 0x03
> +#define CM36672_ADDR_PRX_CONF3 0x04
> +#define CM36672_ADDR_PRX_THDL 0x06
> +#define CM36672_ADDR_PRX_THDH 0x07
> +#define CM36672_REGS_NUM 0x08
> +/* Read only registers */
> +#define CM36672_ADDR_PRX 0x08
> +#define CM36672_ADDR_STATUS 0x0B
> +
> +/* PRX_CONF */
> +#define CM36672_PRX_HD_SHIFT 11
> +#define CM36672_PRX_HD (1 << CM36672_PRX_HD_SHIFT)
> +
> +/* PRX_CONF: interrupt */
> +#define CM36672_PRX_INT_THDH BIT(8)
> +#define CM36672_PRX_INT_THDL BIT(9)
> +#define CM36672_PRX_INT_MASK (CM36672_PRX_INT_THDH | \
> + CM36672_PRX_INT_THDL)
> +
> +/* PRX_CONF: persistence */
> +#define CM36672_PRX_PERS_MASK (BIT(4) | BIT(5))
> +#define CM36672_PRX_PERS_SHIFT 4
> +#define CM36672_PRX_PERS_DISABLE 0
> +#define CM36672_PRX_PERS_2 (1 << CM36672_PRX_PERS_SHIFT)
> +#define CM36672_PRX_PERS_3 (2 << CM36672_PRX_PERS_SHIFT)
> +#define CM36672_PRX_PERS_4 (3 << CM36672_PRX_PERS_SHIFT)
> +
> +/* PRX_CONF: integration time */
> +#define CM36672_PRX_IT_MASK (BIT(1) | BIT(2) | BIT(3))
> +#define CM36672_PRX_IT_SHIFT 1
> +#define CM36672_PRX_IT_1T 0
> +#define CM36672_PRX_IT_1_5T (1 << CM36672_PRX_IT_SHIFT)
> +#define CM36672_PRX_IT_2T (2 << CM36672_PRX_IT_SHIFT)
> +#define CM36672_PRX_IT_2_5T (3 << CM36672_PRX_IT_SHIFT)
> +#define CM36672_PRX_IT_3T (4 << CM36672_PRX_IT_SHIFT)
> +#define CM36672_PRX_IT_3_5T (5 << CM36672_PRX_IT_SHIFT)
> +#define CM36672_PRX_IT_4T (6 << CM36672_PRX_IT_SHIFT)
> +#define CM36672_PRX_IT_8T (7 << CM36672_PRX_IT_SHIFT)
> +
> +/* PRX_CONF3 */
> +#define CM36672_PRX_LED_I_MASK (BIT(8) | BIT(9) | BIT(10))
> +#define CM36672_PRX_LED_I_SHIFT 8
> +#define CM36672_PRX_LED_I_50MA 0
> +#define CM36672_PRX_LED_I_75MA (1 << CM36672_PRX_LED_I_SHIFT)
> +#define CM36672_PRX_LED_I_100MA (2 << CM36672_PRX_LED_I_SHIFT)
> +#define CM36672_PRX_LED_I_120MA (3 << CM36672_PRX_LED_I_SHIFT)
> +#define CM36672_PRX_LED_I_140MA (4 << CM36672_PRX_LED_I_SHIFT)
> +#define CM36672_PRX_LED_I_160MA (5 << CM36672_PRX_LED_I_SHIFT)
> +#define CM36672_PRX_LED_I_180MA (6 << CM36672_PRX_LED_I_SHIFT)
> +#define CM36672_PRX_LED_I_200MA (7 << CM36672_PRX_LED_I_SHIFT)
> +
> +/* INT_FLAG */
> +#define CM36672_INT_PRX_CLOSE BIT(9)
> +#define CM36672_INT_PRX_AWAY BIT(8)
> +
> +struct cm36672_it_scale {
> + u8 it;
> + int val;
> + int val2;
> +};
> +
> +static const struct cm36672_it_scale cm36672_prx_it_scales[] = {
> + {0, 0, 100}, /* 0.00010 */
> + {1, 0, 150}, /* 0.00015 */
> + {2, 0, 200}, /* 0.00020 */
> + {3, 0, 250}, /* 0.00025 */
> + {4, 0, 300}, /* 0.00030 */
> + {5, 0, 350}, /* 0.00035 */
> + {6, 0, 400}, /* 0.00040 */
> + {7, 0, 800}, /* 0.00080 */
> +};
> +
> +#define CM36672_PRX_INT_TIME_AVAIL \
> + "0.000100 0.000150 0.000200 0.000250 " \
> + "0.000300 0.000350 0.000400 0.000800"
> +
> +static const u16 cm36672_regs_default[] = {
> + 0x0001,
> + 0x0000,
> + 0x0000,
> + CM36672_PRX_INT_THDH | CM36672_PRX_INT_THDL |
> + CM36672_PRX_IT_2T | CM36672_PRX_PERS_3,
> + CM36672_PRX_LED_I_100MA,
> + 0x0000,
> + 0x0005,
> + 0x000A,
> +};
> +
> +struct cm36672_chip {
> + const struct cm36672_platform_data *pdata;
> + struct i2c_client *client;
> + struct mutex lock;
> +
> + /* regmap fields */
> + struct regmap *regmap;
> + struct regmap_field *reg_prx_int_hi;
> + struct regmap_field *reg_prx_int_lo;
> + struct regmap_field *reg_prx_it;
> +
> + u16 regs[CM36672_REGS_NUM];
> +};
> +
> +static const struct reg_field cm36672_reg_field_prx_int_hi =
> + REG_FIELD(CM36672_ADDR_PRX_CONF, 8, 8);
> +static const struct reg_field cm36672_reg_field_prx_int_lo =
> + REG_FIELD(CM36672_ADDR_PRX_CONF, 9, 9);
> +static const struct reg_field cm36672_reg_field_prx_it =
> + REG_FIELD(CM36672_ADDR_PRX_CONF, 1, 3);
> +
> +#ifdef CONFIG_OF
> +static void cm36672_mod_u16(u16 *reg, u16 mask, u8 shift, u16 val)
> +{
> + *reg &= ~mask;
> + *reg |= (u16)(val << shift);
> +}
> +
> +static void cm36672_parse_dt(struct cm36672_chip *chip)
> +{
> + struct device_node *dn = chip->client->dev.of_node;
> + u32 temp_val;
> +
> + if (!of_property_read_u32(dn, "cm36672,prx_led_current",
> + &temp_val))
> + cm36672_mod_u16(&chip->regs[CM36672_ADDR_PRX_CONF3],
> + CM36672_PRX_LED_I_MASK,
> + CM36672_PRX_LED_I_SHIFT,
> + (u16)temp_val);
> +
> + if (!of_property_read_u32(dn, "cm36672,prx_hd", &temp_val))
> + cm36672_mod_u16(&chip->regs[CM36672_ADDR_PRX_CONF],
> + CM36672_PRX_HD, CM36672_PRX_HD_SHIFT,
> + (u16)temp_val);
> +}
> +#endif
> +
> +#ifdef CONFIG_ACPI
> +/**
> + * cm36672_acpi_get_cpm_info() - Get CPM object from ACPI
> + * @client: pointer of struct i2c_client.
> + * @obj_name: pointer of ACPI object name.
> + * @count: maximum size of return array.
> + * @vals: pointer of array for return elements.
> + *
> + * Convert ACPI CPM table to array. Special thanks to Srinivas Pandruvada's
> + * help to implement this routine.
> + *
> + * Return: -ENODEV for fail. Otherwise the number of elements.
> + */
> +static int cm36672_acpi_get_cpm_info(struct i2c_client *client, char *obj_name,
> + int count, u64 *vals)
> +{
> + acpi_handle handle;
> + struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
> + int i;
> + acpi_status status;
> + union acpi_object *cpm;
> +
> + handle = ACPI_HANDLE(&client->dev);
> + if (!handle)
> + return -ENODEV;
> +
> + status = acpi_evaluate_object(handle, obj_name, NULL, &buffer);
> + if (ACPI_FAILURE(status)) {
> + dev_err(&client->dev, "object %s not found\n", obj_name);
> + return -ENODEV;
> + }
> +
> + cpm = buffer.pointer;
> + for (i = 0; i < cpm->package.count && i < count; ++i) {
> + union acpi_object *elem;
> +
> + elem = &(cpm->package.elements[i]);
> + vals[i] = elem->integer.value;
> + }
> +
> + kfree(buffer.pointer);
> +
> + return i;
> +}
> +
> +static void cm36672_parse_acpi(struct cm36672_chip *chip)
> +{
> + struct i2c_client *client = chip->client;
> + int cpm_elem_count, i;
> + u64 cpm_elems[20];
> +
> + cpm_elem_count = cm36672_acpi_get_cpm_info(client, "CPM0",
> + ARRAY_SIZE(cpm_elems), cpm_elems);
> +
> + if (cpm_elem_count > 0) {
> + int header_num = 3;
> + int regs_bmp = cpm_elems[2];
> + int reg_num = cpm_elem_count - header_num;
> +
> + if (reg_num > CM36672_REGS_NUM)
> + reg_num = CM36672_REGS_NUM;
> + for (i = 0; i < reg_num; i++)
> + if (regs_bmp & (1 << i))
> + chip->regs[i] = cpm_elems[header_num + i];
> + }
> +}
> +
> +#endif
> +
> +static int cm36672_regfield_init(struct cm36672_chip *chip)
> +{
> + struct device *dev = &chip->client->dev;
> + struct regmap *regmap = chip->regmap;
> +
> + chip->reg_prx_int_lo = devm_regmap_field_alloc(dev, regmap,
> + cm36672_reg_field_prx_int_lo);
> + if (IS_ERR(chip->reg_prx_int_lo)) {
> + dev_err(dev, "%s: reg_prx_int_lo init failed\n", __func__);
> + return PTR_ERR(chip->reg_prx_int_lo);
> + }
> +
> + chip->reg_prx_int_hi = devm_regmap_field_alloc(dev, regmap,
> + cm36672_reg_field_prx_int_hi);
> + if (IS_ERR(chip->reg_prx_int_hi)) {
> + dev_err(dev, "%s: reg_prx_int_hi init failed\n", __func__);
> + return PTR_ERR(chip->reg_prx_int_hi);
> + }
> +
> + chip->reg_prx_it = devm_regmap_field_alloc(dev, regmap,
> + cm36672_reg_field_prx_it);
> + if (IS_ERR(chip->reg_prx_it)) {
> + dev_err(dev, "%s: reg_prx_it init failed\n", __func__);
> + return PTR_ERR(chip->reg_prx_it);
> + }
> +
> + return 0;
> +}
> +
> +/**
> + * cm36672_setup_reg() - Initialize sensor to default values.
> + * @chip: pointer of struct cm36672_chip
> + *
> + * Return: 0 for success; otherwise an error code.
> + */
> +static int cm36672_setup_reg(struct cm36672_chip *chip)
> +{
> + int i, reg, ret;
> + u16 prx_conf;
> +
> + memcpy((char *)&chip->regs, (char *)&cm36672_regs_default,
> + sizeof(cm36672_regs_default));
> +
> +#ifdef CONFIG_OF
> + if (chip->client->dev.of_node)
> + cm36672_parse_dt(chip);
> +#endif
> +
> +#ifdef CONFIG_ACPI
> + if (ACPI_HANDLE(&chip->client->dev))
> + cm36672_parse_acpi(chip);
> +#endif
> +
> + /* Store regs[CM36672_ADDR_PRX_CONF] */
> + prx_conf = chip->regs[CM36672_ADDR_PRX_CONF];
> +
> + /* Disable INT when initialize registers */
> + chip->regs[CM36672_ADDR_PRX_CONF] &= ~CM36672_PRX_INT_THDH;
> + chip->regs[CM36672_ADDR_PRX_CONF] &= ~CM36672_PRX_INT_THDL;
> +
> + for (i = 0; i < CM36672_REGS_NUM; i++) {
> + ret = regmap_write(chip->regmap, i, chip->regs[i]);
> + if (ret < 0)
> + return ret;
> + }
> +
> + /* Restore regs[CM36672_ADDR_PRX_CONF] */
> + chip->regs[CM36672_ADDR_PRX_CONF] = prx_conf;
> +
> + /* Force to clear flags */
> + ret = regmap_read(chip->regmap, CM36672_ADDR_STATUS, ®);
> + if (ret < 0) {
> + dev_err(&chip->client->dev,
> + "%s: Failed to read Status register, err= %d\n",
> + __func__, ret);
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +/**
> + * cm36672_irq_handler() - Interrupt handling routine.
> + * @irq: irq number
> + * @private: pointer of void
> + *
> + * Return: IRQ_HANDLED.
> + */
> +static irqreturn_t cm36672_irq_handler(int irq, void *private)
> +{
> + struct iio_dev *indio_dev = private;
> + struct cm36672_chip *chip = iio_priv(indio_dev);
> + s64 timestamp = iio_get_time_ns();
> + int ret, status;
> +
> + ret = regmap_read(chip->regmap, CM36672_ADDR_STATUS, &status);
> + if (ret < 0)
> + return IRQ_HANDLED;
> +
> + if (status & CM36672_INT_PRX_CLOSE)
> + iio_push_event(indio_dev,
> + IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0,
> + IIO_EV_TYPE_THRESH,
> + IIO_EV_DIR_RISING),
> + timestamp);
> +
> + if (status & CM36672_INT_PRX_AWAY)
> + iio_push_event(indio_dev,
> + IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0,
> + IIO_EV_TYPE_THRESH,
> + IIO_EV_DIR_FALLING),
> + timestamp);
> +
> + return IRQ_HANDLED;
> +}
> +
> +/**
> + * cm36672_read_prx_it() - Get the current proximity integration time.
> + * @chip: point of struct cm36672_chip
> + * @val: point of the integer part of integration time
> + * @val2: point of the micro part of integration time
> + *
> + * Return: IIO_VAL_INT_PLUS_MICRO for success; otherwise an error code.
> + */
> +static int cm36672_read_prx_it(struct cm36672_chip *chip, int *val, int *val2)
> +{
> + int ret, index;
> +
> + ret = regmap_field_read(chip->reg_prx_it, &index);
> + if (ret < 0)
> + return ret;
> +
> + if (index < 0 || index >= ARRAY_SIZE(cm36672_prx_it_scales))
> + return -EINVAL;
> +
> + *val = cm36672_prx_it_scales[index].val;
> + *val2 = cm36672_prx_it_scales[index].val2;
> +
> + return IIO_VAL_INT_PLUS_MICRO;
> +}
> +
> +/**
> + * cm36672_write_prx_it() - Set the proximity integration time.
> + * @chip: point of struct cm36672_chip
> + * @val: the integer part of integration time
> + * @val2: the micro part of integration time
> + *
> + * Return: 0 for success; otherwise an error code.
> + */
> +static int cm36672_write_prx_it(struct cm36672_chip *chip, int val, int val2)
> +{
> + int i;
> +
> + for (i = 0; i < ARRAY_SIZE(cm36672_prx_it_scales); i++)
> + if (val == cm36672_prx_it_scales[i].val &&
> + val2 == cm36672_prx_it_scales[i].val2)
> + return regmap_field_write(chip->reg_prx_it, i);
> +
> + return -EINVAL;
> +}
> +
> +/**
> + * cm36672_prx_read() - Read from proximity sensor.
> + * @indio_dev: point of struct iio_dev
> + * @chan: point of struct iio_chan_spec
> + * @val: point of integer
> + * @val2: point of integer
> + * @mask: iio_chan_info_enum
> + *
> + * Return: IIO_VAL type for success; otherwise an error code.
> + */
> +static int cm36672_prx_read(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan,
> + int *val, int *val2, long mask)
> +{
> + struct cm36672_chip *chip = iio_priv(indio_dev);
> + int ret;
> +
> + if (chan->type != IIO_PROXIMITY)
> + return -EINVAL;
> +
> + switch (mask) {
> + case IIO_CHAN_INFO_INT_TIME:
> + return cm36672_read_prx_it(chip, val, val2);
> + case IIO_CHAN_INFO_RAW:
> + ret = regmap_read(chip->regmap, CM36672_ADDR_PRX, val);
> + if (ret < 0)
> + return ret;
> + return IIO_VAL_INT;
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +/**
> + * cm36672_prx_write() - Write to proximity sensor.
> + * @indio_dev: point of struct iio_dev
> + * @chan: point of struct iio_chan_spec
> + * @val: integer for integer part
> + * @val2: integer for micro part
> + * @mask: iio_chan_info_enum
> + *
> + * Return: Equal or great than 0 for success; otherwise an error code.
> + */
> +static int cm36672_prx_write(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan,
> + int val, int val2, long mask)
> +{
> + struct cm36672_chip *chip = iio_priv(indio_dev);
> +
> + switch (mask) {
> + case IIO_CHAN_INFO_INT_TIME:
> + return cm36672_write_prx_it(chip, val, val2);
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +static int cm36672_read_event(struct iio_dev *indio_dev,
> + const struct iio_chan_spec *chan,
> + enum iio_event_type type,
> + enum iio_event_direction dir,
> + enum iio_event_info info,
> + int *val, int *val2)
> +{
> + struct cm36672_chip *chip = iio_priv(indio_dev);
> + int ret = -EINVAL;
> +
> + if (info != IIO_EV_INFO_VALUE)
> + return -EINVAL;
> +
> + if (chan->type == IIO_PROXIMITY) {
> + *val2 = 0;
> + if (dir == IIO_EV_DIR_RISING)
> + ret = regmap_read(chip->regmap, CM36672_ADDR_PRX_THDH,
> + val);
> + else if (dir == IIO_EV_DIR_FALLING)
> + ret = regmap_read(chip->regmap, CM36672_ADDR_PRX_THDL,
> + val);
> + }
> +
> + if (ret < 0)
> + return ret;
> +
> + return IIO_VAL_INT;
> +}
> +
> +static int cm36672_write_event(struct iio_dev *indio_dev,
> + const struct iio_chan_spec *chan,
> + enum iio_event_type type,
> + enum iio_event_direction dir,
> + enum iio_event_info info,
> + int val, int val2)
> +{
> + int reg, ret = 0;
> + int value, max;
> + struct cm36672_chip *chip = iio_priv(indio_dev);
> +
> + if (info != IIO_EV_INFO_VALUE)
> + return -EINVAL;
> +
> + if (chan->type == IIO_PROXIMITY) {
> + ret = regmap_read(chip->regmap, CM36672_ADDR_PRX_CONF, &value);
> + max = (value & CM36672_PRX_HD) ? 65535:4095;
> + if (val < 0 || val > max)
> + return -EINVAL;
> + if (dir == IIO_EV_DIR_RISING)
> + reg = CM36672_ADDR_PRX_THDH;
> + else if (dir == IIO_EV_DIR_FALLING)
> + reg = CM36672_ADDR_PRX_THDL;
> + else
> + return -EINVAL;
> +
> + ret = regmap_write(chip->regmap, reg, val);
> + if (ret < 0)
> + return ret;
> + } else
> + return -EINVAL;
> +
> + return 0;
> +}
> +
> +static int cm36672_read_event_config(struct iio_dev *indio_dev,
> + const struct iio_chan_spec *chan,
> + enum iio_event_type type,
> + enum iio_event_direction dir)
> +{
> + struct cm36672_chip *chip = iio_priv(indio_dev);
> + int ret, state;
> +
> + if (chan->type == IIO_PROXIMITY) {
> + if (dir == IIO_EV_DIR_RISING)
> + ret = regmap_field_read(chip->reg_prx_int_hi, &state);
> + else if (dir == IIO_EV_DIR_FALLING)
> + ret = regmap_field_read(chip->reg_prx_int_lo, &state);
> + else
> + return -EINVAL;
> +
> + if (ret)
> + return ret;
> +
> + return state;
> + }
> +
> + return -EINVAL;
> +}
> +
> +static int cm36672_write_event_config(struct iio_dev *indio_dev,
> + const struct iio_chan_spec *chan,
> + enum iio_event_type type,
> + enum iio_event_direction dir,
> + int state)
> +{
> + struct cm36672_chip *chip = iio_priv(indio_dev);
> + int ret;
> +
> + if (chan->type == IIO_PROXIMITY) {
> + if (dir == IIO_EV_DIR_RISING)
> + ret = regmap_field_write(chip->reg_prx_int_hi, state);
> + else if (dir == IIO_EV_DIR_FALLING)
> + ret = regmap_field_write(chip->reg_prx_int_lo, state);
> + else
> + return -EINVAL;
> +
> + if (ret)
> + return ret;
> +
> + return 0;
> + }
> +
> + return -EINVAL;
> +}
> +
> +static const struct iio_event_spec cm36672_prx_event_spec[] = {
> + {
> + .type = IIO_EV_TYPE_THRESH,
> + .dir = IIO_EV_DIR_RISING,
> + .mask_separate = BIT(IIO_EV_INFO_VALUE) |
> + BIT(IIO_EV_INFO_ENABLE),
> + },
> + {
> + .type = IIO_EV_TYPE_THRESH,
> + .dir = IIO_EV_DIR_FALLING,
> + .mask_separate = BIT(IIO_EV_INFO_VALUE) |
> + BIT(IIO_EV_INFO_ENABLE),
> + },
> +};
> +
> +static const struct iio_chan_spec cm36672_channels[] = {
> + {
> + .type = IIO_PROXIMITY,
> + .info_mask_separate =
> + BIT(IIO_CHAN_INFO_RAW),
> + BIT(IIO_CHAN_INFO_INT_TIME),
> + .channel = 0,
> + .indexed = 0,
> + .scan_index = -1,
> + .event_spec = cm36672_prx_event_spec,
> + .num_event_specs = ARRAY_SIZE(cm36672_prx_event_spec),
> + },
> +};
> +
> +static bool cm36672_is_writeable_reg(struct device *dev, unsigned int reg)
> +{
> + if (reg <= CM36672_ADDR_PRX_THDH)
> + return true;
> + return false;
> +}
> +
> +static IIO_CONST_ATTR(in_proximity_integration_time_available,
> + CM36672_PRX_INT_TIME_AVAIL);
> +
> +static struct attribute *cm36672_attributes[] = {
> + &iio_const_attr_in_proximity_integration_time_available.dev_attr.attr,
> + NULL,
> +};
> +
> +static const struct attribute_group cm36672_attribute_group = {
> + .attrs = cm36672_attributes
> +};
> +
> +static const struct iio_info cm36672_info = {
> + .driver_module = THIS_MODULE,
> + .read_raw = &cm36672_prx_read,
> + .write_raw = &cm36672_prx_write,
> + .attrs = &cm36672_attribute_group,
> + .read_event_value = cm36672_read_event,
> + .write_event_value = cm36672_write_event,
> + .read_event_config = cm36672_read_event_config,
> + .write_event_config = cm36672_write_event_config,
> +};
> +
> +static const struct iio_info cm36672_info_no_irq = {
> + .driver_module = THIS_MODULE,
> + .read_raw = &cm36672_prx_read,
> + .write_raw = &cm36672_prx_write,
> + .attrs = &cm36672_attribute_group,
> +};
> +
> +static const struct regmap_config cm36672_regmap_config = {
> + .name = CM36672_REGMAP_NAME,
> + .reg_bits = 8,
> + .val_bits = 16,
> + .writeable_reg = cm36672_is_writeable_reg,
> + .use_single_rw = true,
> + .val_format_endian = REGMAP_ENDIAN_LITTLE,
> +};
> +
> +static int cm36672_probe(struct i2c_client *client,
> + const struct i2c_device_id *id)
> +{
> + struct cm36672_chip *chip;
> + struct iio_dev *indio_dev;
> + struct regmap *regmap;
> + int ret;
> +
> + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip));
> + if (!indio_dev)
> + return -ENOMEM;
> +
> + regmap = devm_regmap_init_i2c(client, &cm36672_regmap_config);
> + if (IS_ERR(regmap)) {
> + dev_err(&client->dev, "%s: regmap initialize failed\n",
> + __func__);
> + return PTR_ERR(regmap);
> + }
> +
> + chip = iio_priv(indio_dev);
> + i2c_set_clientdata(client, indio_dev);
> + chip->client = client;
> + chip->regmap = regmap;
> +
> + mutex_init(&chip->lock);
> + indio_dev->dev.parent = &client->dev;
> + indio_dev->channels = cm36672_channels;
> + indio_dev->num_channels = ARRAY_SIZE(cm36672_channels);
> + indio_dev->name = CM36672_DRIVER_NAME;
> + indio_dev->modes = INDIO_DIRECT_MODE;
> +
> + ret = cm36672_regfield_init(chip);
> + if (ret) {
> + dev_err(&client->dev, "%s: regfield init failed\n", __func__);
> + return ret;
> + }
> +
> + ret = cm36672_setup_reg(chip);
> + if (ret) {
> + dev_err(&client->dev, "%s: register setup failed\n", __func__);
> + return ret;
> + }
> +
> + if (client->irq) {
> + indio_dev->info = &cm36672_info;
> +
> + ret = request_threaded_irq(client->irq, NULL,
> + cm36672_irq_handler,
> + IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
> + "cm36672", indio_dev);
> + if (ret) {
> + dev_err(&client->dev,
> + "%s: request irq failed\n",
> + __func__);
> + return ret;
> + }
> +
> + /* Enable interrupt if default request*/
> + if (chip->regs[CM36672_ADDR_PRX_CONF] & CM36672_PRX_INT_MASK) {
> + ret = regmap_write(chip->regmap, CM36672_ADDR_PRX_CONF,
> + chip->regs[CM36672_ADDR_PRX_CONF]);
> + if (ret) {
> + dev_err(&client->dev,
> + "%s: enable interrupt failed\n",
> + __func__);
> + return ret;
> + }
> + }
> + } else
> + indio_dev->info = &cm36672_info_no_irq;
> +
> + ret = iio_device_register(indio_dev);
> + if (ret) {
> + dev_err(&client->dev,
> + "%s: registering device failed\n",
> + __func__);
> + if (client->irq)
> + free_irq(client->irq, indio_dev);
> + }
> +
> + return 0;
> +}
> +
> +static int cm36672_remove(struct i2c_client *client)
> +{
> + struct iio_dev *indio_dev = i2c_get_clientdata(client);
> + struct cm36672_chip *chip = iio_priv(indio_dev);
> +
> + iio_device_unregister(indio_dev);
> + regmap_update_bits(chip->regmap, CM36672_ADDR_PRX_CONF, 1, 1);
> + if (client->irq)
> + free_irq(client->irq, indio_dev);
> +
> + return 0;
> +}
> +
> +static const struct i2c_device_id cm36672_id[] = {
> + { "cm36672", 0 },
> + { }
> +};
> +
> +MODULE_DEVICE_TABLE(i2c, cm36672_id);
> +
> +static const struct of_device_id cm36672_of_match[] = {
> + { .compatible = "capella,cm36672" },
> + { }
> +};
> +
> +#ifdef CONFIG_ACPI
> +static const struct acpi_device_id cm36672_acpi_match[] = {
> + { "CPLM6672", 0},
> + {},
> +};
> +
> +MODULE_DEVICE_TABLE(acpi, cm36672_acpi_match);
> +#endif
> +
> +#ifdef CONFIG_PM_SLEEP
> +static int cm36672_suspend(struct device *dev)
> +{
> + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
> + struct cm36672_chip *chip = iio_priv(indio_dev);
> + struct i2c_client *client = chip->client;
> + int i, ret;
> +
> + for (i = 0; i < CM36672_REGS_NUM; i++) {
> + ret = i2c_smbus_read_word_data(client, i);
> + if (ret < 0)
> + return ret;
> + chip->regs[i] = ret;
> + }
> +
> + return regmap_update_bits(chip->regmap, CM36672_ADDR_PRX_CONF, 1, 1);
> +}
> +
> +static int cm36672_resume(struct device *dev)
> +{
> + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
> + struct cm36672_chip *chip = iio_priv(indio_dev);
> + struct i2c_client *client = chip->client;
> + int i, ret;
> +
> + for (i = 0; i < CM36672_REGS_NUM; i++) {
> + ret = i2c_smbus_write_word_data(client, i, chip->regs[i]);
> + if (ret < 0)
> + return ret;
> + }
> +
> + return regmap_update_bits(chip->regmap, CM36672_ADDR_PRX_CONF, 1, 0);
> +}
> +
> +static const struct dev_pm_ops cm36672_pm_ops = {
> + SET_SYSTEM_SLEEP_PM_OPS(cm36672_suspend, cm36672_resume)};
> +#endif
> +
> +static struct i2c_driver cm36672_driver = {
> + .driver = {
> + .name = CM36672_DRIVER_NAME,
> + .owner = THIS_MODULE,
> + .of_match_table = cm36672_of_match,
> +#ifdef CONFIG_ACPI
> + .acpi_match_table = ACPI_PTR(cm36672_acpi_match),
> +#endif
> +#ifdef CONFIG_PM_SLEEP
> + .pm = &cm36672_pm_ops,
> +#endif
> + },
> + .id_table = cm36672_id,
> + .probe = cm36672_probe,
> + .remove = cm36672_remove,
> +};
> +
> +module_i2c_driver(cm36672_driver);
> +
> +MODULE_AUTHOR("Kevin Tsai <capellamicro@...il.com>");
> +MODULE_DESCRIPTION("CM36672 proximity sensor driver");
> +MODULE_LICENSE("GPL v2");
> --
> 1.8.3.1
>
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