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authorLinus Torvalds <torvalds@linux-foundation.org>2017-05-03 12:16:25 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-05-03 12:16:25 -0700
commitd26f552ebbfb0f2c7fe712f457a038d60ed73daa (patch)
tree8d13c7344cabc99e738e0db7262b713708026fa0 /drivers/input
parente897f267c51812bfecec45771a2d835c1a2bdacf (diff)
parentab6241ae07c3c698543b565e4ea41995a29a3f62 (diff)
Merge tag 'mfd-next-4.12' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd
Pull MFD updates from Lee Jones: "New Drivers: - Freescale MXS Low Resolution ADC - Freescale i.MX23/i.MX28 LRADC touchscreen - Motorola CPCAP Power Button - TI LMU (Lighting Management Unit) - Atmel SMC (Static Memory Controller) New Device Support: - Add support for X-Powers AXP803 to axp20x - Add support for Dialog Semi DA9061 to da9062-core - Add support for Intel Cougar Mountain to lpc_ich - Add support for Intel Gemini Lake to lpc_ich New Functionality: - Add Device Tree support; wm831x-*, axp20x, ti-lmu, da9062, sun4i-gpadc - Add IRQ sense support; motorola-cpcap - Add ACPI support; cros_ec - Add Reset support; altera-a10sr - Add ADC support; axp20x - Add AC Power support; axp20x - Add Runtime PM support; atmel-ebi, exynos-lpass - Add Battery Power Supply support; axp20x - Add Clock support; exynos-lpass, hi655x-pmic Fix-ups: - Implicitly specify required headers; motorola-cpcap, intel_soc_pmic_bxtwc - Add .remove() method; stm32-timers, exynos-lpass - Remove unused code; intel_soc_pmic_core, intel-lpss-acpi, ipaq-micro, atmel-smc, menelaus - Rename variables for clarity; axp20x - Convert pr_warning() to pr_warn(); db8500-prcmu, sta2x11-mfd, twl4030-power - Improve formatting; arizona-core, axp20x - Use raw_spinlock_*() variants; asic3, t7l66xb, tc6393xb - Simplify/refactor code; arizona-core, atmel-ebi - Improve error checking; intel_soc_pmic_core Bug Fixes: - Ensure OMAP3630/3730 boards can successfully reboot; twl4030-power - Correct max-register value; stm32-timers - Extend timeout to account for clock stretching; cros_ec_spi - Use correct IRQ trigger type; motorola-cpcap - Fix bad use of IRQ sense register; motorola-cpcap - Logic error "||" should be "&&"; mxs-lradc-ts" * tag 'mfd-next-4.12' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd: (79 commits) input: touchscreen: mxs-lradc: || vs && typos dt-bindings: Add AXP803's regulator info mfd: axp20x: Support AXP803 variant dt-bindings: Add device tree binding for X-Powers AXP803 PMIC dt-bindings: Make AXP20X compatible strings one per line mfd: intel_soc_pmic_core: Fix unchecked return value mfd: menelaus: Remove obsolete local_irq_disable() and local_irq_enable() mfd: omap-usb-tll: Configure ULPIAUTOIDLE mfd: omap-usb-tll: Fix inverted bit use for USB TLL mode mfd: palmas: Fixed spelling mistake in error message mfd: lpc_ich: Add support for Intel Gemini Lake SoC mfd: hi655x: Add the clock cell to provide WiFi and Bluetooth mfd: intel_soc_pmic: Fix a mess with compilation units mfd: exynos-lpass: Add runtime PM support mfd: exynos-lpass: Add missing remove() function mfd: exynos-lpass: Add support for clocks mfd: exynos-lpass: Remove pad retention control iio: adc: add support for X-Powers AXP20X and AXP22X PMICs ADCs mfd: cpcap: Fix bad use of IRQ sense register mfd: cpcap: Use ack_invert interrupts ...
Diffstat (limited to 'drivers/input')
-rw-r--r--drivers/input/misc/Kconfig10
-rw-r--r--drivers/input/misc/Makefile1
-rw-r--r--drivers/input/misc/cpcap-pwrbutton.c117
-rw-r--r--drivers/input/touchscreen/Kconfig10
-rw-r--r--drivers/input/touchscreen/Makefile1
-rw-r--r--drivers/input/touchscreen/mxs-lradc-ts.c714
6 files changed, 853 insertions, 0 deletions
diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 5b6c52210d20..9f7b72249eac 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -316,6 +316,16 @@ config INPUT_COBALT_BTNS
To compile this driver as a module, choose M here: the
module will be called cobalt_btns.
+config INPUT_CPCAP_PWRBUTTON
+ tristate "CPCAP OnKey"
+ depends on MFD_CPCAP
+ help
+ Say Y here if you want to enable power key reporting via the
+ Motorola CPCAP chip.
+
+ To compile this driver as a module, choose M here. The module will
+ be called cpcap-pwrbutton.
+
config INPUT_WISTRON_BTNS
tristate "x86 Wistron laptop button interface"
depends on X86_32
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index b10523f2878e..b923a9828c88 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -24,6 +24,7 @@ obj-$(CONFIG_INPUT_CM109) += cm109.o
obj-$(CONFIG_INPUT_CMA3000) += cma3000_d0x.o
obj-$(CONFIG_INPUT_CMA3000_I2C) += cma3000_d0x_i2c.o
obj-$(CONFIG_INPUT_COBALT_BTNS) += cobalt_btns.o
+obj-$(CONFIG_INPUT_CPCAP_PWRBUTTON) += cpcap-pwrbutton.o
obj-$(CONFIG_INPUT_DA9052_ONKEY) += da9052_onkey.o
obj-$(CONFIG_INPUT_DA9055_ONKEY) += da9055_onkey.o
obj-$(CONFIG_INPUT_DA9063_ONKEY) += da9063_onkey.o
diff --git a/drivers/input/misc/cpcap-pwrbutton.c b/drivers/input/misc/cpcap-pwrbutton.c
new file mode 100644
index 000000000000..0abef63217e2
--- /dev/null
+++ b/drivers/input/misc/cpcap-pwrbutton.c
@@ -0,0 +1,117 @@
+/**
+ * CPCAP Power Button Input Driver
+ *
+ * Copyright (C) 2017 Sebastian Reichel <sre@kernel.org>
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License. See the file "COPYING" in the main directory of this
+ * archive for more details.
+ *
+ * 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/init.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/regmap.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/motorola-cpcap.h>
+
+#define CPCAP_IRQ_ON 23
+#define CPCAP_IRQ_ON_BITMASK (1 << (CPCAP_IRQ_ON % 16))
+
+struct cpcap_power_button {
+ struct regmap *regmap;
+ struct input_dev *idev;
+ struct device *dev;
+};
+
+static irqreturn_t powerbutton_irq(int irq, void *_button)
+{
+ struct cpcap_power_button *button = _button;
+ int val;
+
+ val = cpcap_sense_virq(button->regmap, irq);
+ if (val < 0) {
+ dev_err(button->dev, "irq read failed: %d", val);
+ return IRQ_HANDLED;
+ }
+
+ pm_wakeup_event(button->dev, 0);
+ input_report_key(button->idev, KEY_POWER, val);
+ input_sync(button->idev);
+
+ return IRQ_HANDLED;
+}
+
+static int cpcap_power_button_probe(struct platform_device *pdev)
+{
+ struct cpcap_power_button *button;
+ int irq = platform_get_irq(pdev, 0);
+ int err;
+
+ button = devm_kmalloc(&pdev->dev, sizeof(*button), GFP_KERNEL);
+ if (!button)
+ return -ENOMEM;
+
+ button->idev = devm_input_allocate_device(&pdev->dev);
+ if (!button->idev)
+ return -ENOMEM;
+
+ button->regmap = dev_get_regmap(pdev->dev.parent, NULL);
+ if (!button->regmap)
+ return -ENODEV;
+
+ button->dev = &pdev->dev;
+
+ button->idev->name = "cpcap-pwrbutton";
+ button->idev->phys = "cpcap-pwrbutton/input0";
+ button->idev->dev.parent = button->dev;
+ input_set_capability(button->idev, EV_KEY, KEY_POWER);
+
+ err = devm_request_threaded_irq(&pdev->dev, irq, NULL,
+ powerbutton_irq, IRQF_ONESHOT, "cpcap_pwrbutton", button);
+ if (err < 0) {
+ dev_err(&pdev->dev, "IRQ request failed: %d\n", err);
+ return err;
+ }
+
+ err = input_register_device(button->idev);
+ if (err) {
+ dev_err(&pdev->dev, "Input register failed: %d\n", err);
+ return err;
+ }
+
+ device_init_wakeup(&pdev->dev, true);
+
+ return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id cpcap_pwrbutton_dt_match_table[] = {
+ { .compatible = "motorola,cpcap-pwrbutton" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, cpcap_pwrbutton_dt_match_table);
+#endif
+
+static struct platform_driver cpcap_power_button_driver = {
+ .probe = cpcap_power_button_probe,
+ .driver = {
+ .name = "cpcap-pwrbutton",
+ .of_match_table = of_match_ptr(cpcap_pwrbutton_dt_match_table),
+ },
+};
+module_platform_driver(cpcap_power_button_driver);
+
+MODULE_ALIAS("platform:cpcap-pwrbutton");
+MODULE_DESCRIPTION("CPCAP Power Button");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>");
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 033599777651..52458cfdf017 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -829,6 +829,16 @@ config TOUCHSCREEN_USB_COMPOSITE
To compile this driver as a module, choose M here: the
module will be called usbtouchscreen.
+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_MX25
tristate "Freescale i.MX25 touchscreen input driver"
depends on MFD_MX25_TSADC
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index b622e5344137..96761ce2ee6d 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -45,6 +45,7 @@ obj-$(CONFIG_TOUCHSCREEN_INEXIO) += inexio.o
obj-$(CONFIG_TOUCHSCREEN_IPROC) += bcm_iproc_tsc.o
obj-$(CONFIG_TOUCHSCREEN_LPC32XX) += lpc32xx_ts.o
obj-$(CONFIG_TOUCHSCREEN_MAX11801) += max11801_ts.o
+obj-$(CONFIG_TOUCHSCREEN_MXS_LRADC) += mxs-lradc-ts.o
obj-$(CONFIG_TOUCHSCREEN_MX25) += fsl-imx25-tcq.o
obj-$(CONFIG_TOUCHSCREEN_MC13783) += mc13783_ts.o
obj-$(CONFIG_TOUCHSCREEN_MCS5000) += mcs5000_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 000000000000..58c016cd6809
--- /dev/null
+++ b/drivers/input/touchscreen/mxs-lradc-ts.c
@@ -0,0 +1,714 @@
+/*
+ * Freescale MXS LRADC touchscreen driver
+ *
+ * Copyright (c) 2012 DENX Software Engineering, GmbH.
+ * Copyright (c) 2017 Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
+ *
+ * Authors:
+ * Marek Vasut <marex@denx.de>
+ * Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
+ *
+ * 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/device.h>
+#include <linux/err.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/mxs-lradc.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/platform_device.h>
+
+const char *mxs_lradc_ts_irq_names[] = {
+ "mxs-lradc-touchscreen",
+ "mxs-lradc-channel6",
+ "mxs-lradc-channel7",
+};
+
+/*
+ * 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;
+
+ void __iomem *base;
+ /*
+ * 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 int ts_x_pos;
+ unsigned int ts_y_pos;
+ unsigned int ts_pressure;
+
+ /* handle touchscreen's physical behaviour */
+ /* samples per coordinate */
+ unsigned int over_sample_cnt;
+ /* time clocks between samples */
+ unsigned int over_sample_delay;
+ /* time in clocks to wait after the plates where switched */
+ unsigned int settling_delay;
+ spinlock_t lock;
+};
+
+struct state_info {
+ u32 mask;
+ u32 bit;
+ u32 x_plate;
+ u32 y_plate;
+ u32 pressure;
+};
+
+static struct state_info info[] = {
+ {LRADC_CTRL0_MX23_PLATE_MASK, LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE,
+ LRADC_CTRL0_MX23_XP | LRADC_CTRL0_MX23_XM,
+ LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_YM,
+ LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_XM},
+ {LRADC_CTRL0_MX28_PLATE_MASK, LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE,
+ LRADC_CTRL0_MX28_XPPSW | LRADC_CTRL0_MX28_XNNSW,
+ LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_YNNSW,
+ LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_XNNSW}
+};
+
+static bool mxs_lradc_check_touch_event(struct mxs_lradc_ts *ts)
+{
+ return !!(readl(ts->base + LRADC_STATUS) &
+ LRADC_STATUS_TOUCH_DETECT_RAW);
+}
+
+static void mxs_lradc_map_ts_channel(struct mxs_lradc_ts *ts, unsigned int vch,
+ unsigned int ch)
+{
+ writel(LRADC_CTRL4_LRADCSELECT_MASK(vch),
+ ts->base + LRADC_CTRL4 + STMP_OFFSET_REG_CLR);
+ writel(LRADC_CTRL4_LRADCSELECT(vch, ch),
+ ts->base + LRADC_CTRL4 + STMP_OFFSET_REG_SET);
+}
+
+static void mxs_lradc_setup_ts_channel(struct mxs_lradc_ts *ts, unsigned int 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."
+ */
+ writel(LRADC_CH_ACCUMULATE |
+ LRADC_CH_NUM_SAMPLES(ts->over_sample_cnt - 1),
+ ts->base + LRADC_CH(ch));
+
+ /* from the datasheet:
+ * "Software must clear this register in preparation for a
+ * multi-cycle accumulation.
+ */
+ writel(LRADC_CH_VALUE_MASK,
+ ts->base + LRADC_CH(ch) + STMP_OFFSET_REG_CLR);
+
+ /*
+ * 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."
+ */
+ writel(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),
+ ts->base + LRADC_DELAY(3));
+
+ writel(LRADC_CTRL1_LRADC_IRQ(ch),
+ ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
+
+ /*
+ * 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.
+ */
+ writel(LRADC_DELAY_TRIGGER(0) | LRADC_DELAY_TRIGGER_DELAYS(BIT(3)) |
+ LRADC_DELAY_KICK | LRADC_DELAY_DELAY(ts->settling_delay),
+ ts->base + 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 int ch1, unsigned int 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(ts->over_sample_cnt - 1);
+ writel(reg, ts->base + LRADC_CH(ch1));
+ writel(reg, ts->base + LRADC_CH(ch2));
+
+ /* from the datasheet:
+ * "Software must clear this register in preparation for a
+ * multi-cycle accumulation.
+ */
+ writel(LRADC_CH_VALUE_MASK,
+ ts->base + LRADC_CH(ch1) + STMP_OFFSET_REG_CLR);
+ writel(LRADC_CH_VALUE_MASK,
+ ts->base + LRADC_CH(ch2) + STMP_OFFSET_REG_CLR);
+
+ /* prepare the delay/loop unit according to the oversampling count */
+ writel(LRADC_DELAY_TRIGGER(1 << ch1) | LRADC_DELAY_TRIGGER(1 << ch2) |
+ LRADC_DELAY_TRIGGER_DELAYS(0) |
+ LRADC_DELAY_LOOP(ts->over_sample_cnt - 1) |
+ LRADC_DELAY_DELAY(ts->over_sample_delay - 1),
+ ts->base + LRADC_DELAY(3));
+
+ writel(LRADC_CTRL1_LRADC_IRQ(ch2),
+ ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
+
+ /*
+ * 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.
+ */
+ writel(LRADC_DELAY_TRIGGER(0) | LRADC_DELAY_TRIGGER_DELAYS(BIT(3)) |
+ LRADC_DELAY_KICK | LRADC_DELAY_DELAY(ts->settling_delay),
+ ts->base + LRADC_DELAY(2));
+}
+
+static unsigned int mxs_lradc_ts_read_raw_channel(struct mxs_lradc_ts *ts,
+ unsigned int channel)
+{
+ u32 reg;
+ unsigned int num_samples, val;
+
+ reg = readl(ts->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 int mxs_lradc_read_ts_pressure(struct mxs_lradc_ts *ts,
+ unsigned int ch1, unsigned int ch2)
+{
+ u32 reg, mask;
+ unsigned int pressure, m1, m2;
+
+ mask = LRADC_CTRL1_LRADC_IRQ(ch1) | LRADC_CTRL1_LRADC_IRQ(ch2);
+ reg = readl(ts->base + LRADC_CTRL1) & mask;
+
+ while (reg != mask) {
+ reg = readl(ts->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
+ */
+ writel(info[lradc->soc].mask,
+ ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR);
+ writel(info[lradc->soc].bit,
+ ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_SET);
+}
+
+/*
+ * 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;
+
+ writel(info[lradc->soc].mask,
+ ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR);
+ writel(info[lradc->soc].x_plate,
+ ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_SET);
+
+ ts->cur_plate = LRADC_SAMPLE_X;
+ mxs_lradc_map_ts_channel(ts, 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;
+
+ writel(info[lradc->soc].mask,
+ ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR);
+ writel(info[lradc->soc].y_plate,
+ ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_SET);
+
+ ts->cur_plate = LRADC_SAMPLE_Y;
+ mxs_lradc_map_ts_channel(ts, 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;
+
+ writel(info[lradc->soc].mask,
+ ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR);
+ writel(info[lradc->soc].pressure,
+ ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_SET);
+
+ ts->cur_plate = LRADC_SAMPLE_PRESSURE;
+ mxs_lradc_map_ts_channel(ts, TOUCHSCREEN_VCHANNEL1, TS_CH_YM);
+ mxs_lradc_map_ts_channel(ts, 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;
+ writel(LRADC_CTRL1_TOUCH_DETECT_IRQ | LRADC_CTRL1_TOUCH_DETECT_IRQ_EN,
+ ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
+ writel(LRADC_CTRL1_TOUCH_DETECT_IRQ_EN,
+ ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_SET);
+}
+
+static void mxs_lradc_start_touch_event(struct mxs_lradc_ts *ts)
+{
+ writel(LRADC_CTRL1_TOUCH_DETECT_IRQ_EN,
+ ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
+ writel(LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL1),
+ ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_SET);
+ /*
+ * 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)
+{
+ 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
+ */
+ writel(0, ts->base + LRADC_CH(TOUCHSCREEN_VCHANNEL1));
+ writel(LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1) |
+ LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL2),
+ ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
+ writel(LRADC_DELAY_TRIGGER(1 << TOUCHSCREEN_VCHANNEL1) |
+ LRADC_DELAY_KICK | LRADC_DELAY_DELAY(10),
+ ts->base + 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)
+{
+ /* if it is still touched, report the sample */
+ if (valid && mxs_lradc_check_touch_event(ts)) {
+ 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(ts)) {
+ 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;
+ writel(0, ts->base + LRADC_DELAY(2));
+ writel(0, ts->base + LRADC_DELAY(3));
+ writel(LRADC_CTRL1_TOUCH_DETECT_IRQ |
+ LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL1) |
+ LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1),
+ ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
+ writel(LRADC_CTRL1_TOUCH_DETECT_IRQ_EN,
+ ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_SET);
+}
+
+/* touchscreen's state machine */
+static void mxs_lradc_handle_touch(struct mxs_lradc_ts *ts)
+{
+ switch (ts->cur_plate) {
+ case LRADC_TOUCH:
+ if (mxs_lradc_check_touch_event(ts))
+ mxs_lradc_start_touch_event(ts);
+ writel(LRADC_CTRL1_TOUCH_DETECT_IRQ,
+ ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
+ 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(ts->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);
+ unsigned long flags;
+
+ if (!(reg & mxs_lradc_irq_mask(lradc)))
+ return IRQ_NONE;
+
+ if (reg & ts_irq_mask) {
+ spin_lock_irqsave(&ts->lock, flags);
+ mxs_lradc_handle_touch(ts);
+ spin_unlock_irqrestore(&ts->lock, flags);
+ /* 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));
+ writel(reg & clr_irq,
+ ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
+ }
+
+ 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_ts_stop(struct mxs_lradc_ts *ts)
+{
+ int i;
+ struct mxs_lradc *lradc = ts->lradc;
+
+ /* stop all interrupts from firing */
+ writel(LRADC_CTRL1_TOUCH_DETECT_IRQ_EN |
+ LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL1) |
+ LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL2),
+ ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
+
+ /* Power-down touchscreen touch-detect circuitry. */
+ writel(info[lradc->soc].mask,
+ ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR);
+
+ writel(lradc->buffer_vchans << LRADC_CTRL1_LRADC_IRQ_EN_OFFSET,
+ ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
+
+ for (i = 1; i < LRADC_MAX_DELAY_CHANS; i++)
+ writel(0, ts->base + LRADC_DELAY(i));
+}
+
+static void mxs_lradc_ts_close(struct input_dev *dev)
+{
+ struct mxs_lradc_ts *ts = input_get_drvdata(dev);
+
+ mxs_lradc_ts_stop(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) {
+ writel(LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE,
+ ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR);
+
+ if (lradc->touchscreen_wire == MXS_LRADC_TOUCHSCREEN_5WIRE)
+ writel(LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE,
+ ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_SET);
+ }
+}
+
+static int mxs_lradc_ts_register(struct mxs_lradc_ts *ts)
+{
+ struct input_dev *input = ts->ts_input;
+ struct device *dev = ts->dev;
+
+ input = devm_input_allocate_device(dev);
+ if (!input)
+ return -ENOMEM;
+
+ input->name = "mxs-lradc-ts";
+ input->id.bustype = BUS_HOST;
+ input->open = mxs_lradc_ts_open;
+ input->close = mxs_lradc_ts_close;
+
+ __set_bit(INPUT_PROP_DIRECT, input->propbit);
+ input_set_capability(input, EV_KEY, BTN_TOUCH);
+ 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_drvdata(dev->parent);
+ struct mxs_lradc_ts *ts;
+ struct resource *iores;
+ int ret, irq, virq, i;
+ u32 ts_wires = 0, adapt;
+
+ ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL);
+ if (!ts)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, ts);
+
+ ts->lradc = lradc;
+ ts->dev = dev;
+ spin_lock_init(&ts->lock);
+
+ iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ ts->base = devm_ioremap(dev, iores->start, resource_size(iores));
+ if (IS_ERR(ts->base))
+ return PTR_ERR(ts->base);
+
+ ret = of_property_read_u32(node, "fsl,lradc-touchscreen-wires",
+ &ts_wires);
+ if (ret)
+ return ret;
+
+ if (of_property_read_u32(node, "fsl,ave-ctrl", &adapt)) {
+ ts->over_sample_cnt = 4;
+ } else {
+ if (adapt >= 1 && adapt <= 32) {
+ ts->over_sample_cnt = adapt;
+ } else {
+ dev_err(ts->dev, "Invalid sample count (%u)\n",
+ adapt);
+ return -EINVAL;
+ }
+ }
+
+ 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) {
+ ts->over_sample_delay = adapt;
+ } else {
+ dev_err(ts->dev, "Invalid sample delay (%u)\n",
+ adapt);
+ return -EINVAL;
+ }
+ }
+
+ if (of_property_read_u32(node, "fsl,settling", &adapt)) {
+ ts->settling_delay = 10;
+ } else {
+ if (adapt >= 1 && adapt <= LRADC_DELAY_DELAY_MASK) {
+ ts->settling_delay = adapt;
+ } else {
+ dev_err(ts->dev, "Invalid settling delay (%u)\n",
+ adapt);
+ return -EINVAL;
+ }
+ }
+
+ ret = stmp_reset_block(ts->base);
+ if (ret)
+ return ret;
+
+ mxs_lradc_ts_hw_init(ts);
+
+ for (i = 0; i < 3; i++) {
+ irq = platform_get_irq_byname(pdev, mxs_lradc_ts_irq_names[i]);
+ if (irq < 0)
+ return irq;
+
+ virq = irq_of_parse_and_map(node, irq);
+
+ mxs_lradc_ts_stop(ts);
+
+ ret = devm_request_irq(dev, virq,
+ mxs_lradc_ts_handle_irq,
+ 0, mxs_lradc_ts_irq_names[i], ts);
+ if (ret)
+ return ret;
+ }
+
+ return mxs_lradc_ts_register(ts);
+}
+
+static struct platform_driver mxs_lradc_ts_driver = {
+ .driver = {
+ .name = "mxs-lradc-ts",
+ },
+ .probe = mxs_lradc_ts_probe,
+};
+module_platform_driver(mxs_lradc_ts_driver);
+
+MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
+MODULE_DESCRIPTION("Freescale MXS LRADC touchscreen driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:mxs-lradc-ts");