[PATCH v2 1/5] input: touchscreen: add imx6ul_tsc driver support

Hi Markus,

-----Original Message-----
From: Markus Pargmann [mailto:mpa at pengutronix.de]
Sent: Friday, August 21, 2015 5:26 PM
To: Chen Haibo-B51421
Cc: robh+dt at kernel.org; pawel.moll at arm.com; mark.rutland at arm.com;
ijc+devicetree at hellion.org.uk; galak at codeaurora.org; shawnguo at kernel.org;
kernel at pengutronix.de; linux at arm.linux.org.uk; dmitry.torokhov at gmail.com;
hans.verkuil at cisco.com; hadess at hadess.net; mchehab at osg.samsung.com;
mamlinav at gmail.com; arnd at arndb.de; jonathar at broadcom.com;
hdegoede at redhat.com; christian.gmeiner at gmail.com; scott.liu at emc.com.tw;
geert at linux-m68k.org; benjamin.tissoires at redhat.com;
sebastien.szymanski at armadeus.com; sbranden at broadcom.com;
devicetree at vger.kernel.org; linux-kernel at vger.kernel.org; linux-arm-
kernel at lists.infradead.org; linux-input at vger.kernel.org
Subject: Re: [PATCH v2 1/5] input: touchscreen: add imx6ul_tsc driver
support

On Tue, Jul 28, 2015 at 05:58:37PM +0800, Haibo Chen wrote:

quoted

Freescale i.MX6UL contains a internal touchscreen controller, this
patch add a driver to support this controller.

Signed-off-by: Haibo Chen <redacted>
---
 drivers/input/touchscreen/Kconfig      |  12 +
 drivers/input/touchscreen/Makefile     |   1 +
 drivers/input/touchscreen/imx6ul_tsc.c | 504
+++++++++++++++++++++++++++++++++
 3 files changed, 517 insertions(+)
 create mode 100644 drivers/input/touchscreen/imx6ul_tsc.c

diff --git a/drivers/input/touchscreen/Kconfig

b/drivers/input/touchscreen/Kconfig
index 5b272ba..32c300d 100644

--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig

@@ -479,6 +479,18 @@ config TOUCHSCREEN_MTOUCH
 	  To compile this driver as a module, choose M here: the
 	  module will be called mtouch.

+config TOUCHSCREEN_IMX6UL_TSC
+	tristate "Freescale i.MX6UL touchscreen controller"
+	depends on OF
+	help
+	  Say Y here if you have a Freescale i.MX6UL, and want to
+	  use the internal touchscreen controller.
+
+	  If unsure, say N.
+
+	  To compile this driver as a module, choose M here: the
+	  moduel will be called imx6ul_tsc.
+
 config TOUCHSCREEN_INEXIO
 	tristate "iNexio serial touchscreens"
 	select SERIO

diff --git a/drivers/input/touchscreen/Makefile

b/drivers/input/touchscreen/Makefile
index c85aae2..9379b32 100644

--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile

@@ -38,6 +38,7 @@ obj-$(CONFIG_TOUCHSCREEN_EGALAX)	+= egalax_ts.o
 obj-$(CONFIG_TOUCHSCREEN_FUJITSU)	+= fujitsu_ts.o
 obj-$(CONFIG_TOUCHSCREEN_GOODIX)	+= goodix.o
 obj-$(CONFIG_TOUCHSCREEN_ILI210X)	+= ili210x.o
+obj-$(CONFIG_TOUCHSCREEN_IMX6UL_TSC)	+= imx6ul_tsc.o
 obj-$(CONFIG_TOUCHSCREEN_INEXIO)	+= inexio.o
 obj-$(CONFIG_TOUCHSCREEN_INTEL_MID)	+= intel-mid-touch.o
 obj-$(CONFIG_TOUCHSCREEN_IPROC)		+= bcm_iproc_tsc.o

diff --git a/drivers/input/touchscreen/imx6ul_tsc.c

b/drivers/input/touchscreen/imx6ul_tsc.c
new file mode 100644
index 0000000..807f1db

--- /dev/null
+++ b/drivers/input/touchscreen/imx6ul_tsc.c

@@ -0,0 +1,504 @@
+/*
+ * Freescale i.MX6UL touchscreen controller driver
+ *
+ * Copyright (C) 2015 Freescale Semiconductor, Inc.
+ *
+ * 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.
+ */
+
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/gpio.h>
+#include <linux/input.h>
+#include <linux/slab.h>
+#include <linux/completion.h>
+#include <linux/delay.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
+#include <linux/of_irq.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+
+/* ADC configuration registers field define */
+#define ADC_AIEN		(0x1 << 7)
+#define ADC_CONV_DISABLE	0x1F
+#define ADC_CAL			(0x1 << 7)
+#define ADC_CALF		0x2
+#define ADC_12BIT_MODE		(0x2 << 2)
+#define ADC_IPG_CLK		0x00
+#define ADC_CLK_DIV_8		(0x03 << 5)
+#define ADC_SHORT_SAMPLE_MODE	(0x0 << 4)
+#define ADC_HARDWARE_TRIGGER	(0x1 << 13)
+#define SELECT_CHANNEL_4	0x04
+#define SELECT_CHANNEL_1	0x01
+#define DISABLE_CONVERSION_INT	(0x0 << 7)
+
+/* ADC registers */
+#define REG_ADC_HC0		0x00
+#define REG_ADC_HC1		0x04
+#define REG_ADC_HC2		0x08
+#define REG_ADC_HC3		0x0C
+#define REG_ADC_HC4		0x10
+#define REG_ADC_HS		0x14
+#define REG_ADC_R0		0x18
+#define REG_ADC_CFG		0x2C
+#define REG_ADC_GC		0x30
+#define REG_ADC_GS		0x34
+
+#define ADC_TIMEOUT		msecs_to_jiffies(100)

These defines are in two drivers. Here and in drivers/iio/adc/vf610_adc.c

Actually, they are different. In the TSC driver, add REG_ADC_HC2/3/4, and the offset of the 
REG_ADC_HS~ REG_ADC_GS also changed.

For i.MX6UL, to support TSC, our IC team add some changes in ADC2, like add add REG_ADC_HC2/3/4,
so that we can config the channel of ADC2 to connect with X-/X+/Y+/Y- of touch screen.
And IC team suggest the ADC2 only used for TSC, should not work as a normal ADC. 
 

quoted

+
+/* TSC registers */
+#define REG_TSC_BASIC_SETING	0x00
+#define REG_TSC_PRE_CHARGE_TIME	0x10
+#define REG_TSC_FLOW_CONTROL	0x20
+#define REG_TSC_MEASURE_VALUE	0x30
+#define REG_TSC_INT_EN		0x40
+#define REG_TSC_INT_SIG_EN	0x50
+#define REG_TSC_INT_STATUS	0x60
+#define REG_TSC_DEBUG_MODE	0x70
+#define REG_TSC_DEBUG_MODE2	0x80
+
+/* TSC configuration registers field define */
+#define DETECT_4_WIRE_MODE	(0x0 << 4)
+#define AUTO_MEASURE		0x1
+#define MEASURE_SIGNAL		0x1
+#define DETECT_SIGNAL		(0x1 << 4)
+#define VALID_SIGNAL		(0x1 << 8)
+#define MEASURE_INT_EN		0x1
+#define MEASURE_SIG_EN		0x1
+#define VALID_SIG_EN		(0x1 << 8)
+#define DE_GLITCH_2		(0x2 << 29)
+#define START_SENSE		(0x1 << 12)
+#define TSC_DISABLE		(0x1 << 16)
+#define DETECT_MODE		0x2
+
+struct imx6ul_tsc {
+	struct device *dev;
+	struct input_dev *input;
+	void __iomem *tsc_regs;
+	void __iomem *adc_regs;
+	struct clk *tsc_clk;
+	struct clk *adc_clk;
+
+	int xnur_gpio;
+	int measure_delay_time;
+	int pre_charge_time;
+
+	struct completion completion;
+};
+
+/*
+ * TSC module need ADC to get the measure value. So
+ * before config TSC, we should initialize ADC module.
+ */
+static void imx6ul_adc_init(struct imx6ul_tsc *tsc) {
+	int adc_hc = 0;
+	int adc_gc;
+	int adc_gs;
+	int adc_cfg;
+	int timeout;
+
+	adc_cfg = readl(tsc->adc_regs + REG_ADC_CFG);
+	adc_cfg |= ADC_12BIT_MODE | ADC_IPG_CLK;
+	adc_cfg |= ADC_CLK_DIV_8 | ADC_SHORT_SAMPLE_MODE;
+	adc_cfg &= ~ADC_HARDWARE_TRIGGER;
+	writel(adc_cfg, tsc->adc_regs + REG_ADC_CFG);
+
+	/* enable calibration interrupt */
+	adc_hc |= ADC_AIEN;
+	adc_hc |= ADC_CONV_DISABLE;
+	writel(adc_hc, tsc->adc_regs + REG_ADC_HC0);
+
+	/* start ADC calibration */
+	adc_gc = readl(tsc->adc_regs + REG_ADC_GC);
+	adc_gc |= ADC_CAL;
+	writel(adc_gc, tsc->adc_regs + REG_ADC_GC);
+
+	timeout = wait_for_completion_timeout
+			(&tsc->completion, ADC_TIMEOUT);
+	if (timeout == 0)
+		dev_err(tsc->dev, "Timeout for adc calibration\n");
+
+	adc_gs = readl(tsc->adc_regs + REG_ADC_GS);
+	if (adc_gs & ADC_CALF)
+		dev_err(tsc->dev, "ADC calibration failed\n");
+
+	/* TSC need the ADC work in hardware trigger */
+	adc_cfg = readl(tsc->adc_regs + REG_ADC_CFG);
+	adc_cfg |= ADC_HARDWARE_TRIGGER;
+	writel(adc_cfg, tsc->adc_regs + REG_ADC_CFG); }
+
+/*
+ * This is a TSC workaround. Currently TSC misconnect two
+ * ADC channels, this function remap channel configure for
+ * hardware trigger.
+ */
+static void imx6ul_tsc_channel_config(struct imx6ul_tsc *tsc) {
+	int adc_hc0, adc_hc1, adc_hc2, adc_hc3, adc_hc4;
+
+	adc_hc0 = DISABLE_CONVERSION_INT;
+	writel(adc_hc0, tsc->adc_regs + REG_ADC_HC0);
+
+	adc_hc1 = DISABLE_CONVERSION_INT | SELECT_CHANNEL_4;
+	writel(adc_hc1, tsc->adc_regs + REG_ADC_HC1);
+
+	adc_hc2 = DISABLE_CONVERSION_INT;
+	writel(adc_hc2, tsc->adc_regs + REG_ADC_HC2);
+
+	adc_hc3 = DISABLE_CONVERSION_INT | SELECT_CHANNEL_1;
+	writel(adc_hc3, tsc->adc_regs + REG_ADC_HC3);
+
+	adc_hc4 = DISABLE_CONVERSION_INT;
+	writel(adc_hc4, tsc->adc_regs + REG_ADC_HC4); }

Is this code similar to initialization of the adc driver? Does it make
sense to move this code to the ADC driver?

 
Our IC team misconnect the ADC's channel1 and channel3,  in the TSC logic,
ADC channel1  --->   Y-
ADC channel2  --->   Y+
ADC channel3  --->   X-
ADC channel4  --->   X+
The upper connection can make tsc work normal, but our IC team make a mistake,
in default,  ADC channel1  connect to X-, ADC channel3 connect to Y-.

So these code is just a software workaround, switch the ADC channel1 and channel3,
to make the TSC work normal.

So I think we should distinguish these code and the adc initialization.

Best regards,

haibo

Best regards,

Markus

quoted

+
+/*
+ * TSC setting, confige the pre-charge time and measure delay time.
+ * different touch screen may need different pre-charge time and
+ * measure delay time.
+ */
+static void imx6ul_tsc_set(struct imx6ul_tsc *tsc) {
+	int basic_setting = 0;
+	int start;
+
+	basic_setting |= tsc->measure_delay_time << 8;
+	basic_setting |= DETECT_4_WIRE_MODE | AUTO_MEASURE;
+	writel(basic_setting, tsc->tsc_regs + REG_TSC_BASIC_SETING);
+
+	writel(DE_GLITCH_2, tsc->tsc_regs + REG_TSC_DEBUG_MODE2);
+
+	writel(tsc->pre_charge_time, tsc->tsc_regs +

REG_TSC_PRE_CHARGE_TIME);

quoted

+	writel(MEASURE_INT_EN, tsc->tsc_regs + REG_TSC_INT_EN);
+	writel(MEASURE_SIG_EN | VALID_SIG_EN,
+		tsc->tsc_regs + REG_TSC_INT_SIG_EN);
+
+	/* start sense detection */
+	start = readl(tsc->tsc_regs + REG_TSC_FLOW_CONTROL);
+	start |= START_SENSE;
+	start &= ~TSC_DISABLE;
+	writel(start, tsc->tsc_regs + REG_TSC_FLOW_CONTROL); }
+
+static void imx6ul_tsc_init(struct imx6ul_tsc *tsc) {
+	imx6ul_adc_init(tsc);
+	imx6ul_tsc_channel_config(tsc);
+	imx6ul_tsc_set(tsc);
+}
+
+static irqreturn_t tsc_irq_fn(int irq, void *dev_id) {
+	struct imx6ul_tsc *tsc = (struct imx6ul_tsc *)dev_id;
+	int status;
+	int value;
+	int x, y;
+	int xnur;
+	int debug_mode2;
+	int state_machine;
+	int start;
+	unsigned long timeout;
+
+	status = readl(tsc->tsc_regs + REG_TSC_INT_STATUS);
+
+	/* write 1 to clear the bit measure-signal */
+	writel(MEASURE_SIGNAL | DETECT_SIGNAL,
+		tsc->tsc_regs + REG_TSC_INT_STATUS);
+
+	/* It's a HW self-clean bit. Set this bit and start sense detection

*/

quoted

+	start = readl(tsc->tsc_regs + REG_TSC_FLOW_CONTROL);
+	start |= START_SENSE;
+	writel(start, tsc->tsc_regs + REG_TSC_FLOW_CONTROL);
+
+	if (status & MEASURE_SIGNAL) {
+		value = readl(tsc->tsc_regs + REG_TSC_MEASURE_VALUE);
+		x = (value >> 16) & 0x0fff;
+		y = value & 0x0fff;
+
+		/*
+		 * Delay some time(max 2ms), wait the pre-charge done.
+		 * After the pre-change mode, TSC go into detect mode.
+		 * And in detect mode, we can get the xnur gpio value.
+		 * If xnur is low, this means the touch screen still
+		 * be touched. If xnur is high, this means finger leave
+		 * the touch screen.
+		 */
+		timeout = jiffies + HZ/500;
+		do {
+			if (time_after(jiffies, timeout)) {
+				xnur = 0;
+				goto touch_event;
+			}
+			usleep_range(200, 400);
+			debug_mode2 = readl(tsc->tsc_regs +

REG_TSC_DEBUG_MODE2);

quoted

+			state_machine = (debug_mode2 >> 20) & 0x7;
+		} while (state_machine != DETECT_MODE);
+		usleep_range(200, 400);
+
+		xnur = gpio_get_value(tsc->xnur_gpio);
+touch_event:
+		if (xnur == 0) {
+			input_report_key(tsc->input, BTN_TOUCH, 1);
+			input_report_abs(tsc->input, ABS_X, x);
+			input_report_abs(tsc->input, ABS_Y, y);
+		} else
+			input_report_key(tsc->input, BTN_TOUCH, 0);
+
+		input_sync(tsc->input);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t adc_irq_fn(int irq, void *dev_id) {
+	struct imx6ul_tsc *tsc = (struct imx6ul_tsc *)dev_id;
+	int coco;
+	int value;
+
+	coco = readl(tsc->adc_regs + REG_ADC_HS);
+	if (coco & 0x01) {
+		value = readl(tsc->adc_regs + REG_ADC_R0);
+		complete(&tsc->completion);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static const struct of_device_id imx6ul_tsc_match[] = {
+	{ .compatible = "fsl,imx6ul-tsc", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, imx6ul_tsc_match);
+
+static int imx6ul_tsc_probe(struct platform_device *pdev) {
+	struct imx6ul_tsc *tsc;
+	struct resource *tsc_mem;
+	struct resource *adc_mem;
+	struct input_dev *input_dev;
+	struct device_node *np = pdev->dev.of_node;
+	int err;
+	int tsc_irq;
+	int adc_irq;
+
+	tsc = devm_kzalloc(&pdev->dev, sizeof(struct imx6ul_tsc),

GFP_KERNEL);

quoted

+	input_dev = devm_input_allocate_device(&pdev->dev);
+
+	tsc->dev = &pdev->dev;
+
+	tsc->input = input_dev;
+	tsc->input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
+	tsc->input->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
+	input_set_abs_params(tsc->input, ABS_X, 0, 0xFFF, 0, 0);
+	input_set_abs_params(tsc->input, ABS_Y, 0, 0xFFF, 0, 0);
+
+	tsc->input->name = "iMX6UL TouchScreen Controller";
+
+	tsc->xnur_gpio = of_get_named_gpio(np, "xnur-gpio", 0);
+	err = gpio_request_one(tsc->xnur_gpio, GPIOF_IN, "tsc_X-");
+	if (err) {
+		dev_err(&pdev->dev, "failed to request GPIO tsc_X-\n");
+		return err;
+	}
+
+	tsc_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	tsc->tsc_regs = devm_ioremap_resource(&pdev->dev, tsc_mem);
+	if (IS_ERR(tsc->tsc_regs)) {
+		dev_err(&pdev->dev, "failed to remap tsc memory\n");
+		err = PTR_ERR(tsc->tsc_regs);
+		return err;
+	}
+
+	adc_mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	tsc->adc_regs = devm_ioremap_resource(&pdev->dev, adc_mem);
+	if (IS_ERR(tsc->adc_regs)) {
+		dev_err(&pdev->dev, "failed to remap adc memory\n");
+		err = PTR_ERR(tsc->adc_regs);
+		return err;
+	}
+
+	tsc->tsc_clk = devm_clk_get(&pdev->dev, "tsc");
+	if (IS_ERR(tsc->tsc_clk)) {
+		dev_err(&pdev->dev, "failed getting tsc clock\n");
+		err = PTR_ERR(tsc->tsc_clk);
+		return err;
+	}
+
+	tsc->adc_clk = devm_clk_get(&pdev->dev, "adc");
+	if (IS_ERR(tsc->adc_clk)) {
+		dev_err(&pdev->dev, "failed getting adc clock\n");
+		err = PTR_ERR(tsc->adc_clk);
+		return err;
+	}
+
+	tsc_irq = platform_get_irq(pdev, 0);
+	if (tsc_irq < 0) {
+		dev_err(&pdev->dev, "no tsc irq resource?\n");
+		return tsc_irq;
+	}
+
+	adc_irq = platform_get_irq(pdev, 1);
+	if (adc_irq <= 0) {
+		dev_err(&pdev->dev, "no adc irq resource?\n");
+		return adc_irq;
+	}
+
+	err = devm_request_threaded_irq(tsc->dev, tsc_irq,
+					NULL, tsc_irq_fn,
+					IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
+					dev_name(&pdev->dev), tsc);
+	if (err < 0) {
+		dev_err(&pdev->dev,
+			"failed requesting tsc irq %d\n",
+					    tsc_irq);
+		return err;
+	}
+
+	err = devm_request_irq(tsc->dev, adc_irq,
+				adc_irq_fn, 0,
+				dev_name(&pdev->dev), tsc);
+	if (err < 0) {
+		dev_err(&pdev->dev,
+			"failed requesting adc irq %d\n",
+					    adc_irq);
+		return err;
+	}
+
+	err = of_property_read_u32(np, "measure-delay-time",
+				&tsc->measure_delay_time);
+	if (err)
+		tsc->measure_delay_time = 0xffff;
+
+	err = of_property_read_u32(np, "pre-charge-time",
+				&tsc->pre_charge_time);
+	if (err)
+		tsc->pre_charge_time = 0xfff;
+
+	init_completion(&tsc->completion);
+
+	err = clk_prepare_enable(tsc->adc_clk);
+	if (err) {
+		dev_err(&pdev->dev,
+			"Could not prepare or enable the adc clock.\n");
+		return err;
+	}
+
+	err = clk_prepare_enable(tsc->tsc_clk);
+	if (err) {
+		dev_err(&pdev->dev,
+			"Could not prepare or enable the tsc clock.\n");
+		goto error_tsc_clk_enable;
+	}
+
+	err = input_register_device(tsc->input);
+	if (err < 0) {
+		dev_err(&pdev->dev, "failed to register input device\n");
+		err = -EIO;
+		goto err_input_register;
+	}
+
+	imx6ul_tsc_init(tsc);
+
+	platform_set_drvdata(pdev, tsc);
+	return 0;
+
+err_input_register:
+	clk_disable_unprepare(tsc->tsc_clk);
+error_tsc_clk_enable:
+	clk_disable_unprepare(tsc->adc_clk);
+
+	return err;
+}
+
+static void imx6ul_tsc_disable(struct imx6ul_tsc *tsc) {
+	int tsc_flow;
+	int adc_cfg;
+
+	/* TSC controller enters to idle status */
+	tsc_flow = readl(tsc->tsc_regs + REG_TSC_FLOW_CONTROL);
+	tsc_flow |= TSC_DISABLE;
+	writel(tsc_flow, tsc->tsc_regs + REG_TSC_FLOW_CONTROL);
+
+	/* ADC controller enters to stop mode */
+	adc_cfg = readl(tsc->adc_regs + REG_ADC_HC0);
+	adc_cfg |= ADC_CONV_DISABLE;
+	writel(adc_cfg, tsc->adc_regs + REG_ADC_HC0); }
+
+static int imx6ul_tsc_remove(struct platform_device *pdev) {
+	struct imx6ul_tsc *tsc = platform_get_drvdata(pdev);
+
+	imx6ul_tsc_disable(tsc);
+
+	clk_disable_unprepare(tsc->tsc_clk);
+	clk_disable_unprepare(tsc->adc_clk);
+	input_unregister_device(tsc->input);
+	kfree(tsc);
+
+	return 0;
+}
+
+static int __maybe_unused imx6ul_tsc_suspend(struct device *dev) {
+	struct platform_device *pdev = to_platform_device(dev);
+	struct imx6ul_tsc *tsc = platform_get_drvdata(pdev);
+
+	imx6ul_tsc_disable(tsc);
+
+	clk_disable_unprepare(tsc->tsc_clk);
+	clk_disable_unprepare(tsc->adc_clk);
+
+	return 0;
+}
+
+static int __maybe_unused imx6ul_tsc_resume(struct device *dev) {
+	struct platform_device *pdev = to_platform_device(dev);
+	struct imx6ul_tsc *tsc = platform_get_drvdata(pdev);
+	int err;
+
+	err = clk_prepare_enable(tsc->adc_clk);
+	if (err)
+		return err;
+
+	err = clk_prepare_enable(tsc->tsc_clk);
+	if (err) {
+		clk_disable_unprepare(tsc->adc_clk);
+		return err;
+	}
+
+	imx6ul_tsc_init(tsc);
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(imx6ul_tsc_pm_ops,
+			 imx6ul_tsc_suspend,
+			 imx6ul_tsc_resume);
+
+static struct platform_driver imx6ul_tsc_driver = {
+	.driver		= {
+		.name	= "imx6ul-tsc",
+		.owner	= THIS_MODULE,
+		.of_match_table	= imx6ul_tsc_match,
+		.pm	= &imx6ul_tsc_pm_ops,
+	},
+	.probe		= imx6ul_tsc_probe,
+	.remove		= imx6ul_tsc_remove,
+};
+module_platform_driver(imx6ul_tsc_driver);
+
+MODULE_AUTHOR("Haibo Chen [off-list ref]");
+MODULE_DESCRIPTION("Freescale i.MX6UL Touchscreen controller
+driver"); MODULE_LICENSE("GPL v2");
--
1.9.1

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