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Message-Id: <61fe1da2e8d82921f3222ec939047b6823f695e1.1461930102.git.ksenija.stanojevic@gmail.com>
Date: Fri, 29 Apr 2016 13:49:11 +0200
From: Ksenija Stanojevic <ksenija.stanojevic@...il.com>
To: linux-kernel@...r.kernel.org
Cc: lee.jones@...aro.org, dmitry.torokhov@...il.com,
linux-input@...r.kernel.org, jic23@...nel.org, knaack.h@....de,
lars@...afoo.de, pmeerw@...erw.net, marex@...x.de,
linux-iio@...r.kernel.org, harald@...ib.org,
Ksenija Stanojevic <ksenija.stanojevic@...il.com>
Subject: [PATCH 3/3] input: touchscreen: mxs-lradc: Add support for touchscreen
Add mxs-lradc touchscreen driver.
Signed-off-by: Ksenija Stanojevic <ksenija.stanojevic@...il.com>
---
drivers/input/touchscreen/Kconfig | 14 +-
drivers/input/touchscreen/Makefile | 1 +
drivers/input/touchscreen/mxs-lradc-ts.c | 729 +++++++++++++++++++++++++++++++
3 files changed, 742 insertions(+), 2 deletions(-)
create mode 100644 drivers/input/touchscreen/mxs-lradc-ts.c
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 8ecdc38..d614d248 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -566,7 +566,7 @@ config TOUCHSCREEN_HP600
depends on SH_HP6XX && SH_ADC
help
Say Y here if you have a HP Jornada 620/660/680/690 and want to
- support the built-in touchscreen.
+ support the built-in touchscreen.
To compile this driver as a module, choose M here: the
module will be called hp680_ts_input.
@@ -685,7 +685,7 @@ config TOUCHSCREEN_UCB1400
This enables support for the Philips UCB1400 touchscreen interface.
The UCB1400 is an AC97 audio codec. The touchscreen interface
will be initialized only after the ALSA subsystem has been
- brought up and the UCB1400 detected. You therefore have to
+ brought up and the UCB1400 detected. You therefore have to
configure ALSA support as well (either built-in or modular,
independently of whether this driver is itself built-in or
modular) for this driver to work.
@@ -842,6 +842,16 @@ config TOUCHSCREEN_MX25
To compile this driver as a module, choose M here: the
module will be called fsl-imx25-tcq.
+config TOUCHSCREEN_MXS_LRADC
+ tristate "Freescale i.MX23/i.MX28 LRADC touchscreen"
+ depends on MFD_MXS_LRADC
+ help
+ Say Y here if you have a touchscreen connected to the low-resolution
+ analog-to-digital converter (LRADC) on an i.MX23 or i.MX28 processor.
+
+ To compile this driver as a module, choose M here: the module will be
+ called mxs-lradc-ts.
+
config TOUCHSCREEN_MC13783
tristate "Freescale MC13783 touchscreen input driver"
depends on MFD_MC13XXX
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index f42975e..513a6ff 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -54,6 +54,7 @@ obj-$(CONFIG_TOUCHSCREEN_MIGOR) += migor_ts.o
obj-$(CONFIG_TOUCHSCREEN_MMS114) += mms114.o
obj-$(CONFIG_TOUCHSCREEN_MTOUCH) += mtouch.o
obj-$(CONFIG_TOUCHSCREEN_MK712) += mk712.o
+obj-$(CONFIG_TOUCHSCREEN_MXS_LRADC) += mxs-lradc-ts.o
obj-$(CONFIG_TOUCHSCREEN_HP600) += hp680_ts_input.o
obj-$(CONFIG_TOUCHSCREEN_HP7XX) += jornada720_ts.o
obj-$(CONFIG_TOUCHSCREEN_IPAQ_MICRO) += ipaq-micro-ts.o
diff --git a/drivers/input/touchscreen/mxs-lradc-ts.c b/drivers/input/touchscreen/mxs-lradc-ts.c
new file mode 100644
index 0000000..27abb8e
--- /dev/null
+++ b/drivers/input/touchscreen/mxs-lradc-ts.c
@@ -0,0 +1,729 @@
+/*
+ * 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/module.h>
+#include <linux/mfd/mxs-lradc.h>
+#include <linux/platform_device.h>
+
+/*
+ * Touchscreen handling
+ */
+enum mxs_lradc_ts_plate {
+ LRADC_TOUCH = 0,
+ LRADC_SAMPLE_X,
+ LRADC_SAMPLE_Y,
+ LRADC_SAMPLE_PRESSURE,
+ LRADC_SAMPLE_VALID,
+};
+
+struct mxs_lradc_ts {
+ struct mxs_lradc *lradc;
+ struct device *dev;
+ /*
+ * 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
+
+ struct input_dev *ts_input;
+
+ enum mxs_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;
+};
+
+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_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_ts_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_ts *ts, unsigned ch)
+{
+ struct mxs_lradc *lradc = ts->lradc;
+
+ /*
+ * 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(ts->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(ts->over_sample_cnt - 1) |
+ LRADC_DELAY_DELAY(ts->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(ts->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_ts *ts, unsigned ch1,
+ unsigned ch2)
+{
+ struct mxs_lradc *lradc = ts->lradc;
+ 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(ts->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(ts->over_sample_cnt - 1) |
+ LRADC_DELAY_DELAY(ts->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(ts->settling_delay), LRADC_DELAY(2));
+}
+
+static unsigned mxs_lradc_ts_read_raw_channel(struct mxs_lradc_ts *ts,
+ unsigned channel)
+{
+ u32 reg;
+ unsigned num_samples, val;
+ struct mxs_lradc *lradc = ts->lradc;
+
+ reg = readl(lradc->base + LRADC_CH(channel));
+ if (reg & LRADC_CH_ACCUMULATE)
+ num_samples = ts->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_ts *ts,
+ unsigned ch1, unsigned ch2)
+{
+ u32 reg, mask;
+ unsigned pressure, m1, m2;
+ struct mxs_lradc *lradc = ts->lradc;
+
+ 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(ts->dev, "One channel is still busy: %X\n", reg);
+ }
+
+ m1 = mxs_lradc_ts_read_raw_channel(ts, ch1);
+ m2 = mxs_lradc_ts_read_raw_channel(ts, ch2);
+
+ if (m2 == 0) {
+ dev_warn(ts->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(ts->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_ts *ts)
+{
+ struct mxs_lradc *lradc = ts->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_ts *ts)
+{
+ struct mxs_lradc *lradc = ts->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);
+
+ ts->cur_plate = LRADC_SAMPLE_X;
+ mxs_lradc_map_ts_channel(lradc, TOUCHSCREEN_VCHANNEL1, TS_CH_YP);
+ mxs_lradc_setup_ts_channel(ts, 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_ts *ts)
+{
+ struct mxs_lradc *lradc = ts->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);
+
+ ts->cur_plate = LRADC_SAMPLE_Y;
+ mxs_lradc_map_ts_channel(lradc, TOUCHSCREEN_VCHANNEL1, TS_CH_XM);
+ mxs_lradc_setup_ts_channel(ts, 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_ts *ts)
+{
+ struct mxs_lradc *lradc = ts->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);
+
+ ts->cur_plate = LRADC_SAMPLE_PRESSURE;
+ mxs_lradc_map_ts_channel(lradc, TOUCHSCREEN_VCHANNEL1, TS_CH_YM);
+ mxs_lradc_map_ts_channel(lradc, TOUCHSCREEN_VCHANNEL2, TS_CH_XP);
+ mxs_lradc_setup_ts_pressure(ts, TOUCHSCREEN_VCHANNEL2,
+ TOUCHSCREEN_VCHANNEL1);
+}
+
+static void mxs_lradc_enable_touch_detection(struct mxs_lradc_ts *ts)
+{
+ mxs_lradc_setup_touch_detection(ts);
+
+ ts->cur_plate = LRADC_TOUCH;
+ mxs_lradc_reg_clear(ts->lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ |
+ LRADC_CTRL1_TOUCH_DETECT_IRQ_EN, LRADC_CTRL1);
+ mxs_lradc_reg_set(ts->lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ_EN,
+ LRADC_CTRL1);
+}
+
+static void mxs_lradc_start_touch_event(struct mxs_lradc_ts *ts)
+{
+ mxs_lradc_reg_clear(ts->lradc,
+ LRADC_CTRL1_TOUCH_DETECT_IRQ_EN,
+ LRADC_CTRL1);
+ mxs_lradc_reg_set(ts->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(ts);
+}
+
+static void mxs_lradc_report_ts_event(struct mxs_lradc_ts *ts)
+{
+ input_report_abs(ts->ts_input, ABS_X, ts->ts_x_pos);
+ input_report_abs(ts->ts_input, ABS_Y, ts->ts_y_pos);
+ input_report_abs(ts->ts_input, ABS_PRESSURE, ts->ts_pressure);
+ input_report_key(ts->ts_input, BTN_TOUCH, 1);
+ input_sync(ts->ts_input);
+}
+
+static void mxs_lradc_complete_touch_event(struct mxs_lradc_ts *ts)
+{
+ struct mxs_lradc *lradc = ts->lradc;
+
+ mxs_lradc_setup_touch_detection(ts);
+ ts->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_ts *ts, bool valid)
+{
+ struct mxs_lradc *lradc = ts->lradc;
+
+ /* if it is still touched, report the sample */
+ if (valid && mxs_lradc_check_touch_event(lradc)) {
+ ts->ts_valid = true;
+ mxs_lradc_report_ts_event(ts);
+ }
+
+ /* if it is even still touched, continue with the next measurement */
+ if (mxs_lradc_check_touch_event(lradc)) {
+ mxs_lradc_prepare_y_pos(ts);
+ return;
+ }
+
+ if (ts->ts_valid) {
+ /* signal the release */
+ ts->ts_valid = false;
+ input_report_key(ts->ts_input, BTN_TOUCH, 0);
+ input_sync(ts->ts_input);
+ }
+
+ /* if it is released, wait for the next touch via IRQ */
+ ts->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_ts *ts)
+{
+ struct mxs_lradc *lradc = ts->lradc;
+
+ switch (ts->cur_plate) {
+ case LRADC_TOUCH:
+ if (mxs_lradc_check_touch_event(lradc))
+ mxs_lradc_start_touch_event(ts);
+ mxs_lradc_reg_clear(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ,
+ LRADC_CTRL1);
+ return;
+
+ case LRADC_SAMPLE_Y:
+ ts->ts_y_pos =
+ mxs_lradc_ts_read_raw_channel(ts, TOUCHSCREEN_VCHANNEL1);
+ mxs_lradc_prepare_x_pos(ts);
+ return;
+
+ case LRADC_SAMPLE_X:
+ ts->ts_x_pos =
+ mxs_lradc_ts_read_raw_channel(ts, TOUCHSCREEN_VCHANNEL1);
+ mxs_lradc_prepare_pressure(ts);
+ return;
+
+ case LRADC_SAMPLE_PRESSURE:
+ ts->ts_pressure =
+ mxs_lradc_read_ts_pressure(ts,
+ TOUCHSCREEN_VCHANNEL2,
+ TOUCHSCREEN_VCHANNEL1);
+ mxs_lradc_complete_touch_event(ts);
+ return;
+
+ case LRADC_SAMPLE_VALID:
+ mxs_lradc_finish_touch_event(ts, 1);
+ break;
+ }
+}
+
+/*
+ * IRQ Handling
+ */
+static irqreturn_t mxs_lradc_ts_handle_irq(int irq, void *data)
+{
+ struct mxs_lradc_ts *ts = data;
+ struct mxs_lradc *lradc = ts->lradc;
+ 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(ts);
+
+ /* 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));
+ mxs_lradc_reg_clear(lradc, reg & clr_irq, LRADC_CTRL1);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int mxs_lradc_ts_open(struct input_dev *dev)
+{
+ struct mxs_lradc_ts *ts = input_get_drvdata(dev);
+
+ /* Enable the touch-detect circuitry. */
+ mxs_lradc_enable_touch_detection(ts);
+
+ return 0;
+}
+
+static void mxs_lradc_disable_ts(struct mxs_lradc_ts *ts)
+{
+ struct mxs_lradc *lradc = ts->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_ts *ts = input_get_drvdata(dev);
+
+ mxs_lradc_disable_ts(ts);
+}
+
+static void mxs_lradc_ts_hw_init(struct mxs_lradc_ts *ts)
+{
+ struct mxs_lradc *lradc = ts->lradc;
+
+ /* 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);
+ }
+}
+
+static void mxs_lradc_ts_hw_stop(struct mxs_lradc_ts *ts)
+{
+ int i;
+ struct mxs_lradc *lradc = ts->lradc;
+
+ mxs_lradc_reg_clear(lradc,
+ lradc->buffer_vchans << LRADC_CTRL1_LRADC_IRQ_EN_OFFSET,
+ LRADC_CTRL1);
+
+ for (i = 1; i < LRADC_MAX_DELAY_CHANS; i++)
+ mxs_lradc_reg_wrt(ts->lradc, 0, LRADC_DELAY(i));
+}
+
+static int mxs_lradc_ts_register(struct mxs_lradc_ts *ts)
+{
+ struct input_dev *input = ts->ts_input;
+ struct device *dev = ts->dev;
+ struct mxs_lradc *lradc = ts->lradc;
+
+ if (!lradc->use_touchscreen)
+ return 0;
+
+ input->name = DRIVER_NAME_TS;
+ 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);
+ __set_bit(INPUT_PROP_DIRECT, input->propbit);
+ 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);
+
+ ts->ts_input = input;
+ input_set_drvdata(input, ts);
+
+ return input_register_device(input);
+}
+
+static int mxs_lradc_ts_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *node = dev->parent->of_node;
+ struct mxs_lradc *lradc = dev_get_platdata(dev);
+ struct mxs_lradc_ts *ts;
+ struct input_dev *input;
+ int touch_ret, ret, i;
+ u32 ts_wires = 0, adapt;
+
+ ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL);
+ input = devm_input_allocate_device(dev);
+ if (!ts || !input)
+ return -ENOMEM;
+
+ ts->lradc = lradc;
+ ts->dev = dev;
+ ts->ts_input = input;
+ platform_set_drvdata(pdev, ts);
+ input_set_drvdata(input, ts);
+
+ touch_ret = of_property_read_u32(node, "fsl,lradc-touchscreen-wires",
+ &ts_wires);
+
+ if (of_property_read_u32(node, "fsl,ave-ctrl", &adapt)) {
+ ts->over_sample_cnt = 4;
+ } else {
+ if (adapt < 1 || adapt > 32) {
+ dev_err(ts->dev, "Invalid sample count (%u)\n",
+ adapt);
+ touch_ret = -EINVAL;
+ } else {
+ ts->over_sample_cnt = adapt;
+ }
+ }
+
+ if (of_property_read_u32(node, "fsl,ave-delay", &adapt)) {
+ ts->over_sample_delay = 2;
+ } else {
+ if (adapt < 2 || adapt > LRADC_DELAY_DELAY_MASK + 1) {
+ dev_err(ts->dev, "Invalid sample delay (%u)\n",
+ adapt);
+ touch_ret = -EINVAL;
+ } else {
+ ts->over_sample_delay = adapt;
+ }
+ }
+
+ if (of_property_read_u32(node, "fsl,settling", &adapt)) {
+ ts->settling_delay = 10;
+ } else {
+ if (adapt < 1 || adapt > LRADC_DELAY_DELAY_MASK) {
+ dev_err(ts->dev, "Invalid settling delay (%u)\n",
+ adapt);
+ touch_ret = -EINVAL;
+ } else {
+ ts->settling_delay = adapt;
+ }
+ }
+
+ mxs_lradc_ts_hw_init(ts);
+ for (i = 0; i < lradc->irq_count; i++) {
+ ret = devm_request_irq(dev, lradc->irq[i],
+ mxs_lradc_ts_handle_irq,
+ IRQF_SHARED, lradc->irq_name[i], ts);
+ if (ret)
+ return ret;
+ }
+
+ if (!touch_ret) {
+ ret = mxs_lradc_ts_register(ts);
+ if (!ret)
+ goto err_ts_register;
+ }
+
+ return 0;
+
+err_ts_register:
+ mxs_lradc_ts_hw_stop(ts);
+ return ret;
+}
+
+static int mxs_lradc_ts_remove(struct platform_device *pdev)
+{
+ struct mxs_lradc_ts *ts = platform_get_drvdata(pdev);
+
+ mxs_lradc_ts_hw_stop(ts);
+
+ return 0;
+}
+
+static struct platform_driver mxs_lradc_ts_driver = {
+ .driver = {
+ .name = DRIVER_NAME_TS,
+ },
+ .probe = mxs_lradc_ts_probe,
+ .remove = mxs_lradc_ts_remove,
+};
+module_platform_driver(mxs_lradc_ts_driver);
+
+MODULE_LICENSE("GPL v2");
--
1.9.1
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