Merge tag 'v4.12-rc3' into for-linus

Merge with mainline to get acpi_dev_present() needed by patches to
axp20x-pek driver.

13 files changed, 866 insertions, 33 deletions

diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c
index e9ae3d500a55..925571475005 100644
--- a/drivers/input/evdev.c
+++ b/drivers/input/evdev.c
@@ -1354,8 +1354,6 @@ static void evdev_cleanup(struct evdev *evdev)
 	evdev_mark_dead(evdev);
 	evdev_hangup(evdev);
 
-	cdev_del(&evdev->cdev);
-
 	/* evdev is marked dead so no one else accesses evdev->open */
 	if (evdev->open) {
 		input_flush_device(handle, NULL);
@@ -1416,12 +1414,8 @@ static int evdev_connect(struct input_handler *handler, struct input_dev *dev,
 		goto err_free_evdev;
 
 	cdev_init(&evdev->cdev, &evdev_fops);
-	evdev->cdev.kobj.parent = &evdev->dev.kobj;
-	error = cdev_add(&evdev->cdev, evdev->dev.devt, 1);
-	if (error)
-		goto err_unregister_handle;
 
-	error = device_add(&evdev->dev);
+	error = cdev_device_add(&evdev->cdev, &evdev->dev);
 	if (error)
 		goto err_cleanup_evdev;
 
@@ -1429,7 +1423,6 @@ static int evdev_connect(struct input_handler *handler, struct input_dev *dev,
 
  err_cleanup_evdev:
 	evdev_cleanup(evdev);
- err_unregister_handle:
 	input_unregister_handle(&evdev->handle);
  err_free_evdev:
 	put_device(&evdev->dev);
@@ -1442,7 +1435,7 @@ static void evdev_disconnect(struct input_handle *handle)
 {
 	struct evdev *evdev = handle->private;
 
-	device_del(&evdev->dev);
+	cdev_device_del(&evdev->cdev, &evdev->dev);
 	evdev_cleanup(evdev);
 	input_free_minor(MINOR(evdev->dev.devt));
 	input_unregister_handle(handle);
diff --git a/drivers/input/joydev.c b/drivers/input/joydev.c
index 065e67bf56dd..29d677c714d2 100644
--- a/drivers/input/joydev.c
+++ b/drivers/input/joydev.c
@@ -742,8 +742,6 @@ static void joydev_cleanup(struct joydev *joydev)
 	joydev_mark_dead(joydev);
 	joydev_hangup(joydev);
 
-	cdev_del(&joydev->cdev);
-
 	/* joydev is marked dead so no one else accesses joydev->open */
 	if (joydev->open)
 		input_close_device(handle);
@@ -913,12 +911,8 @@ static int joydev_connect(struct input_handler *handler, struct input_dev *dev,
 		goto err_free_joydev;
 
 	cdev_init(&joydev->cdev, &joydev_fops);
-	joydev->cdev.kobj.parent = &joydev->dev.kobj;
-	error = cdev_add(&joydev->cdev, joydev->dev.devt, 1);
-	if (error)
-		goto err_unregister_handle;
 
-	error = device_add(&joydev->dev);
+	error = cdev_device_add(&joydev->cdev, &joydev->dev);
 	if (error)
 		goto err_cleanup_joydev;
 
@@ -926,7 +920,6 @@ static int joydev_connect(struct input_handler *handler, struct input_dev *dev,
 
  err_cleanup_joydev:
 	joydev_cleanup(joydev);
- err_unregister_handle:
 	input_unregister_handle(&joydev->handle);
  err_free_joydev:
 	put_device(&joydev->dev);
@@ -939,7 +932,7 @@ static void joydev_disconnect(struct input_handle *handle)
 {
 	struct joydev *joydev = handle->private;
 
-	device_del(&joydev->dev);
+	cdev_device_del(&joydev->cdev, &joydev->dev);
 	joydev_cleanup(joydev);
 	input_free_minor(MINOR(joydev->dev.devt));
 	input_unregister_handle(handle);
diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 79d0be9885c5..3872488c3fd7 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/misc/soc_button_array.c b/drivers/input/misc/soc_button_array.c
index f210a3322559..e37d37273182 100644
--- a/drivers/input/misc/soc_button_array.c
+++ b/drivers/input/misc/soc_button_array.c
@@ -320,9 +320,10 @@ static int soc_button_probe(struct platform_device *pdev)
 		button_info = (struct soc_button_info *)id->driver_data;
 	}
 
-	if (gpiod_count(dev, NULL) <= 0) {
+	error = gpiod_count(dev, NULL);
+	if (error < 0) {
 		dev_dbg(dev, "no GPIO attached, ignoring...\n");
-		return -ENODEV;
+		return error;
 	}
 
 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
diff --git a/drivers/input/mouse/inport.c b/drivers/input/mouse/inport.c
index 3827a22362de..9ce71dfa0de1 100644
--- a/drivers/input/mouse/inport.c
+++ b/drivers/input/mouse/inport.c
@@ -78,7 +78,7 @@ MODULE_LICENSE("GPL");
 #define INPORT_IRQ		5
 
 static int inport_irq = INPORT_IRQ;
-module_param_named(irq, inport_irq, uint, 0);
+module_param_hw_named(irq, inport_irq, uint, irq, 0);
 MODULE_PARM_DESC(irq, "IRQ number (5=default)");
 
 static struct input_dev *inport_dev;
diff --git a/drivers/input/mouse/logibm.c b/drivers/input/mouse/logibm.c
index e2413113df22..6f165e053f4d 100644
--- a/drivers/input/mouse/logibm.c
+++ b/drivers/input/mouse/logibm.c
@@ -69,7 +69,7 @@ MODULE_LICENSE("GPL");
 #define LOGIBM_IRQ		5
 
 static int logibm_irq = LOGIBM_IRQ;
-module_param_named(irq, logibm_irq, uint, 0);
+module_param_hw_named(irq, logibm_irq, uint, irq, 0);
 MODULE_PARM_DESC(irq, "IRQ number (5=default)");
 
 static struct input_dev *logibm_dev;
diff --git a/drivers/input/mousedev.c b/drivers/input/mousedev.c
index b604564dec5c..0e0ff84088fd 100644
--- a/drivers/input/mousedev.c
+++ b/drivers/input/mousedev.c
@@ -812,8 +812,6 @@ static void mousedev_cleanup(struct mousedev *mousedev)
 	mousedev_mark_dead(mousedev);
 	mousedev_hangup(mousedev);
 
-	cdev_del(&mousedev->cdev);
-
 	/* mousedev is marked dead so no one else accesses mousedev->open */
 	if (mousedev->open)
 		input_close_device(handle);
@@ -901,12 +899,8 @@ static struct mousedev *mousedev_create(struct input_dev *dev,
 	}
 
 	cdev_init(&mousedev->cdev, &mousedev_fops);
-	mousedev->cdev.kobj.parent = &mousedev->dev.kobj;
-	error = cdev_add(&mousedev->cdev, mousedev->dev.devt, 1);
-	if (error)
-		goto err_unregister_handle;
 
-	error = device_add(&mousedev->dev);
+	error = cdev_device_add(&mousedev->cdev, &mousedev->dev);
 	if (error)
 		goto err_cleanup_mousedev;
 
@@ -914,7 +908,6 @@ static struct mousedev *mousedev_create(struct input_dev *dev,
 
  err_cleanup_mousedev:
 	mousedev_cleanup(mousedev);
- err_unregister_handle:
 	if (!mixdev)
 		input_unregister_handle(&mousedev->handle);
  err_free_mousedev:
@@ -927,7 +920,7 @@ static struct mousedev *mousedev_create(struct input_dev *dev,
 
 static void mousedev_destroy(struct mousedev *mousedev)
 {
-	device_del(&mousedev->dev);
+	cdev_device_del(&mousedev->cdev, &mousedev->dev);
 	mousedev_cleanup(mousedev);
 	input_free_minor(MINOR(mousedev->dev.devt));
 	if (mousedev != mousedev_mix)
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index e3c5112505e4..cf26ca49ae6d 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -831,6 +831,16 @@ 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 ad5c896222bc..18e476948e44 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/mk712.c b/drivers/input/touchscreen/mk712.c
index 36e57deacd03..bd5352824f77 100644
--- a/drivers/input/touchscreen/mk712.c
+++ b/drivers/input/touchscreen/mk712.c
@@ -50,11 +50,11 @@ MODULE_DESCRIPTION("ICS MicroClock MK712 TouchScreen driver");
 MODULE_LICENSE("GPL");
 
 static unsigned int mk712_io = 0x260;	/* Also 0x200, 0x208, 0x300 */
-module_param_named(io, mk712_io, uint, 0);
+module_param_hw_named(io, mk712_io, uint, ioport, 0);
 MODULE_PARM_DESC(io, "I/O base address of MK712 touchscreen controller");
 
 static unsigned int mk712_irq = 10;	/* Also 12, 14, 15 */
-module_param_named(irq, mk712_irq, uint, 0);
+module_param_hw_named(irq, mk712_irq, uint, irq, 0);
 MODULE_PARM_DESC(irq, "IRQ of MK712 touchscreen controller");
 
 /* eight 8-bit registers */
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");