[mirror_ubuntu-focal-kernel.git] / drivers / input / touchscreen / stmpe-ts.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * STMicroelectronics STMPE811 Touchscreen Driver
 *
 * (C) 2010 Luotao Fu <l.fu@pengutronix.de>
 * All rights reserved.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/input.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/workqueue.h>

#include <linux/mfd/stmpe.h>

/* Register layouts and functionalities are identical on all stmpexxx variants
 * with touchscreen controller
 */
#define STMPE_REG_INT_STA		0x0B
#define STMPE_REG_TSC_CTRL		0x40
#define STMPE_REG_TSC_CFG		0x41
#define STMPE_REG_FIFO_TH		0x4A
#define STMPE_REG_FIFO_STA		0x4B
#define STMPE_REG_FIFO_SIZE		0x4C
#define STMPE_REG_TSC_DATA_XYZ		0x52
#define STMPE_REG_TSC_FRACTION_Z	0x56
#define STMPE_REG_TSC_I_DRIVE		0x58

#define OP_MOD_XYZ			0

#define STMPE_TSC_CTRL_TSC_EN		(1<<0)

#define STMPE_FIFO_STA_RESET		(1<<0)

#define STMPE_IRQ_TOUCH_DET		0

#define STMPE_TS_NAME			"stmpe-ts"
#define XY_MASK				0xfff

/**
 * struct stmpe_touch - stmpe811 touch screen controller state
 * @stmpe: pointer back to STMPE MFD container
 * @idev: registered input device
 * @work: a work item used to scan the device
 * @dev: a pointer back to the MFD cell struct device*
 * @ave_ctrl: Sample average control
 * (0 -> 1 sample, 1 -> 2 samples, 2 -> 4 samples, 3 -> 8 samples)
 * @touch_det_delay: Touch detect interrupt delay
 * (0 -> 10 us, 1 -> 50 us, 2 -> 100 us, 3 -> 500 us,
 * 4-> 1 ms, 5 -> 5 ms, 6 -> 10 ms, 7 -> 50 ms)
 * recommended is 3
 * @settling: Panel driver settling time
 * (0 -> 10 us, 1 -> 100 us, 2 -> 500 us, 3 -> 1 ms,
 * 4 -> 5 ms, 5 -> 10 ms, 6 for 50 ms, 7 -> 100 ms)
 * recommended is 2
 * @fraction_z: Length of the fractional part in z
 * (fraction_z ([0..7]) = Count of the fractional part)
 * recommended is 7
 * @i_drive: current limit value of the touchscreen drivers
 * (0 -> 20 mA typical 35 mA max, 1 -> 50 mA typical 80 mA max)
 */
struct stmpe_touch {
	struct stmpe *stmpe;
	struct input_dev *idev;
	struct delayed_work work;
	struct device *dev;
	u8 ave_ctrl;
	u8 touch_det_delay;
	u8 settling;
	u8 fraction_z;
	u8 i_drive;
};

static int __stmpe_reset_fifo(struct stmpe *stmpe)
{
	int ret;

	ret = stmpe_set_bits(stmpe, STMPE_REG_FIFO_STA,
			STMPE_FIFO_STA_RESET, STMPE_FIFO_STA_RESET);
	if (ret)
		return ret;

	return stmpe_set_bits(stmpe, STMPE_REG_FIFO_STA,
			STMPE_FIFO_STA_RESET, 0);
}

static void stmpe_work(struct work_struct *work)
{
	int int_sta;
	u32 timeout = 40;

	struct stmpe_touch *ts =
	    container_of(work, struct stmpe_touch, work.work);

	int_sta = stmpe_reg_read(ts->stmpe, STMPE_REG_INT_STA);

	/*
	 * touch_det sometimes get desasserted or just get stuck. This appears
	 * to be a silicon bug, We still have to clearify this with the
	 * manufacture. As a workaround We release the key anyway if the
	 * touch_det keeps coming in after 4ms, while the FIFO contains no value
	 * during the whole time.
	 */
	while ((int_sta & (1 << STMPE_IRQ_TOUCH_DET)) && (timeout > 0)) {
		timeout--;
		int_sta = stmpe_reg_read(ts->stmpe, STMPE_REG_INT_STA);
		udelay(100);
	}

	/* reset the FIFO before we report release event */
	__stmpe_reset_fifo(ts->stmpe);

	input_report_abs(ts->idev, ABS_PRESSURE, 0);
	input_report_key(ts->idev, BTN_TOUCH, 0);
	input_sync(ts->idev);
}

static irqreturn_t stmpe_ts_handler(int irq, void *data)
{
	u8 data_set[4];
	int x, y, z;
	struct stmpe_touch *ts = data;

	/*
	 * Cancel scheduled polling for release if we have new value
	 * available. Wait if the polling is already running.
	 */
	cancel_delayed_work_sync(&ts->work);

	/*
	 * The FIFO sometimes just crashes and stops generating interrupts. This
	 * appears to be a silicon bug. We still have to clearify this with
	 * the manufacture. As a workaround we disable the TSC while we are
	 * collecting data and flush the FIFO after reading
	 */
	stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,
				STMPE_TSC_CTRL_TSC_EN, 0);

	stmpe_block_read(ts->stmpe, STMPE_REG_TSC_DATA_XYZ, 4, data_set);

	x = (data_set[0] << 4) | (data_set[1] >> 4);
	y = ((data_set[1] & 0xf) << 8) | data_set[2];
	z = data_set[3];

	input_report_abs(ts->idev, ABS_X, x);
	input_report_abs(ts->idev, ABS_Y, y);
	input_report_abs(ts->idev, ABS_PRESSURE, z);
	input_report_key(ts->idev, BTN_TOUCH, 1);
	input_sync(ts->idev);

       /* flush the FIFO after we have read out our values. */
	__stmpe_reset_fifo(ts->stmpe);

	/* reenable the tsc */
	stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,
			STMPE_TSC_CTRL_TSC_EN, STMPE_TSC_CTRL_TSC_EN);

	/* start polling for touch_det to detect release */
	schedule_delayed_work(&ts->work, msecs_to_jiffies(50));

	return IRQ_HANDLED;
}

static int stmpe_init_hw(struct stmpe_touch *ts)
{
	int ret;
	u8 tsc_cfg, tsc_cfg_mask;
	struct stmpe *stmpe = ts->stmpe;
	struct device *dev = ts->dev;

	ret = stmpe_enable(stmpe, STMPE_BLOCK_TOUCHSCREEN | STMPE_BLOCK_ADC);
	if (ret) {
		dev_err(dev, "Could not enable clock for ADC and TS\n");
		return ret;
	}

	ret = stmpe811_adc_common_init(stmpe);
	if (ret) {
		stmpe_disable(stmpe, STMPE_BLOCK_TOUCHSCREEN | STMPE_BLOCK_ADC);
		return ret;
	}

	tsc_cfg = STMPE_AVE_CTRL(ts->ave_ctrl) |
		  STMPE_DET_DELAY(ts->touch_det_delay) |
		  STMPE_SETTLING(ts->settling);
	tsc_cfg_mask = STMPE_AVE_CTRL(0xff) | STMPE_DET_DELAY(0xff) |
		       STMPE_SETTLING(0xff);

	ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_CFG, tsc_cfg_mask, tsc_cfg);
	if (ret) {
		dev_err(dev, "Could not config touch\n");
		return ret;
	}

	ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_FRACTION_Z,
			STMPE_FRACTION_Z(0xff), STMPE_FRACTION_Z(ts->fraction_z));
	if (ret) {
		dev_err(dev, "Could not config touch\n");
		return ret;
	}

	ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_I_DRIVE,
			STMPE_I_DRIVE(0xff), STMPE_I_DRIVE(ts->i_drive));
	if (ret) {
		dev_err(dev, "Could not config touch\n");
		return ret;
	}

	/* set FIFO to 1 for single point reading */
	ret = stmpe_reg_write(stmpe, STMPE_REG_FIFO_TH, 1);
	if (ret) {
		dev_err(dev, "Could not set FIFO\n");
		return ret;
	}

	ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_CTRL,
			STMPE_OP_MODE(0xff), STMPE_OP_MODE(OP_MOD_XYZ));
	if (ret) {
		dev_err(dev, "Could not set mode\n");
		return ret;
	}

	return 0;
}

static int stmpe_ts_open(struct input_dev *dev)
{
	struct stmpe_touch *ts = input_get_drvdata(dev);
	int ret = 0;

	ret = __stmpe_reset_fifo(ts->stmpe);
	if (ret)
		return ret;

	return stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,
			STMPE_TSC_CTRL_TSC_EN, STMPE_TSC_CTRL_TSC_EN);
}

static void stmpe_ts_close(struct input_dev *dev)
{
	struct stmpe_touch *ts = input_get_drvdata(dev);

	cancel_delayed_work_sync(&ts->work);

	stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,
			STMPE_TSC_CTRL_TSC_EN, 0);
}

static void stmpe_ts_get_platform_info(struct platform_device *pdev,
					struct stmpe_touch *ts)
{
	struct device_node *np = pdev->dev.of_node;
	u32 val;

	if (np) {
		if (!of_property_read_u32(np, "st,sample-time", &val))
			ts->stmpe->sample_time = val;
		if (!of_property_read_u32(np, "st,mod-12b", &val))
			ts->stmpe->mod_12b = val;
		if (!of_property_read_u32(np, "st,ref-sel", &val))
			ts->stmpe->ref_sel = val;
		if (!of_property_read_u32(np, "st,adc-freq", &val))
			ts->stmpe->adc_freq = val;
		if (!of_property_read_u32(np, "st,ave-ctrl", &val))
			ts->ave_ctrl = val;
		if (!of_property_read_u32(np, "st,touch-det-delay", &val))
			ts->touch_det_delay = val;
		if (!of_property_read_u32(np, "st,settling", &val))
			ts->settling = val;
		if (!of_property_read_u32(np, "st,fraction-z", &val))
			ts->fraction_z = val;
		if (!of_property_read_u32(np, "st,i-drive", &val))
			ts->i_drive = val;
	}
}

static int stmpe_input_probe(struct platform_device *pdev)
{
	struct stmpe *stmpe = dev_get_drvdata(pdev->dev.parent);
	struct stmpe_touch *ts;
	struct input_dev *idev;
	int error;
	int ts_irq;

	ts_irq = platform_get_irq_byname(pdev, "FIFO_TH");
	if (ts_irq < 0)
		return ts_irq;

	ts = devm_kzalloc(&pdev->dev, sizeof(*ts), GFP_KERNEL);
	if (!ts)
		return -ENOMEM;

	idev = devm_input_allocate_device(&pdev->dev);
	if (!idev)
		return -ENOMEM;

	platform_set_drvdata(pdev, ts);
	ts->stmpe = stmpe;
	ts->idev = idev;
	ts->dev = &pdev->dev;

	stmpe_ts_get_platform_info(pdev, ts);

	INIT_DELAYED_WORK(&ts->work, stmpe_work);

	error = devm_request_threaded_irq(&pdev->dev, ts_irq,
					  NULL, stmpe_ts_handler,
					  IRQF_ONESHOT, STMPE_TS_NAME, ts);
	if (error) {
		dev_err(&pdev->dev, "Failed to request IRQ %d\n", ts_irq);
		return error;
	}

	error = stmpe_init_hw(ts);
	if (error)
		return error;

	idev->name = STMPE_TS_NAME;
	idev->phys = STMPE_TS_NAME"/input0";
	idev->id.bustype = BUS_I2C;

	idev->open = stmpe_ts_open;
	idev->close = stmpe_ts_close;

	input_set_drvdata(idev, ts);

	input_set_capability(idev, EV_KEY, BTN_TOUCH);
	input_set_abs_params(idev, ABS_X, 0, XY_MASK, 0, 0);
	input_set_abs_params(idev, ABS_Y, 0, XY_MASK, 0, 0);
	input_set_abs_params(idev, ABS_PRESSURE, 0x0, 0xff, 0, 0);

	error = input_register_device(idev);
	if (error) {
		dev_err(&pdev->dev, "Could not register input device\n");
		return error;
	}

	return 0;
}

static int stmpe_ts_remove(struct platform_device *pdev)
{
	struct stmpe_touch *ts = platform_get_drvdata(pdev);

	stmpe_disable(ts->stmpe, STMPE_BLOCK_TOUCHSCREEN);

	return 0;
}

static struct platform_driver stmpe_ts_driver = {
	.driver = {
		.name = STMPE_TS_NAME,
	},
	.probe = stmpe_input_probe,
	.remove = stmpe_ts_remove,
};
module_platform_driver(stmpe_ts_driver);

static const struct of_device_id stmpe_ts_ids[] = {
	{ .compatible = "st,stmpe-ts", },
	{ },
};
MODULE_DEVICE_TABLE(of, stmpe_ts_ids);

MODULE_AUTHOR("Luotao Fu <l.fu@pengutronix.de>");
MODULE_DESCRIPTION("STMPEXXX touchscreen driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
2bd942f9 VK	2	/*
2bd942f9 VK	3	* STMicroelectronics STMPE811 Touchscreen Driver
f94add3b LF	4	*
	5	* (C) 2010 Luotao Fu <l.fu@pengutronix.de>
	6	* All rights reserved.
f94add3b LF	7	*/
	8
	9	#include <linux/kernel.h>
	10	#include <linux/module.h>
	11	#include <linux/sched.h>
	12	#include <linux/interrupt.h>
f94add3b	13	#include <linux/device.h>
037db524	14	#include <linux/of.h>
f94add3b LF	15	#include <linux/platform_device.h>
	16	#include <linux/input.h>
	17	#include <linux/slab.h>
	18	#include <linux/delay.h>
	19	#include <linux/i2c.h>
	20	#include <linux/workqueue.h>
	21
	22	#include <linux/mfd/stmpe.h>
	23
	24	/* Register layouts and functionalities are identical on all stmpexxx variants
	25	* with touchscreen controller
	26	*/
	27	#define STMPE_REG_INT_STA 0x0B
f94add3b LF	28	#define STMPE_REG_TSC_CTRL 0x40
	29	#define STMPE_REG_TSC_CFG 0x41
	30	#define STMPE_REG_FIFO_TH 0x4A
	31	#define STMPE_REG_FIFO_STA 0x4B
	32	#define STMPE_REG_FIFO_SIZE 0x4C
	33	#define STMPE_REG_TSC_DATA_XYZ 0x52
	34	#define STMPE_REG_TSC_FRACTION_Z 0x56
	35	#define STMPE_REG_TSC_I_DRIVE 0x58
	36
	37	#define OP_MOD_XYZ 0
	38
	39	#define STMPE_TSC_CTRL_TSC_EN (1<<0)
	40
	41	#define STMPE_FIFO_STA_RESET (1<<0)
	42
	43	#define STMPE_IRQ_TOUCH_DET 0
	44
f94add3b LF	45	#define STMPE_TS_NAME "stmpe-ts"
	46	#define XY_MASK 0xfff
	47
564a68de LW	48	/**
	49	* struct stmpe_touch - stmpe811 touch screen controller state
	50	* @stmpe: pointer back to STMPE MFD container
	51	* @idev: registered input device
	52	* @work: a work item used to scan the device
	53	* @dev: a pointer back to the MFD cell struct device*
564a68de LW	54	* @ave_ctrl: Sample average control
	55	* (0 -> 1 sample, 1 -> 2 samples, 2 -> 4 samples, 3 -> 8 samples)
	56	* @touch_det_delay: Touch detect interrupt delay
	57	* (0 -> 10 us, 1 -> 50 us, 2 -> 100 us, 3 -> 500 us,
	58	* 4-> 1 ms, 5 -> 5 ms, 6 -> 10 ms, 7 -> 50 ms)
	59	* recommended is 3
	60	* @settling: Panel driver settling time
	61	* (0 -> 10 us, 1 -> 100 us, 2 -> 500 us, 3 -> 1 ms,
	62	* 4 -> 5 ms, 5 -> 10 ms, 6 for 50 ms, 7 -> 100 ms)
	63	* recommended is 2
	64	* @fraction_z: Length of the fractional part in z
	65	* (fraction_z ([0..7]) = Count of the fractional part)
	66	* recommended is 7
	67	* @i_drive: current limit value of the touchscreen drivers
	68	* (0 -> 20 mA typical 35 mA max, 1 -> 50 mA typical 80 mA max)
	69	*/
f94add3b LF	70	struct stmpe_touch {
	71	struct stmpe *stmpe;
	72	struct input_dev *idev;
	73	struct delayed_work work;
	74	struct device *dev;
f94add3b LF	75	u8 ave_ctrl;
	76	u8 touch_det_delay;
	77	u8 settling;
	78	u8 fraction_z;
	79	u8 i_drive;
	80	};
	81
	82	static int __stmpe_reset_fifo(struct stmpe *stmpe)
	83	{
	84	int ret;
	85
	86	ret = stmpe_set_bits(stmpe, STMPE_REG_FIFO_STA,
	87	STMPE_FIFO_STA_RESET, STMPE_FIFO_STA_RESET);
	88	if (ret)
	89	return ret;
	90
	91	return stmpe_set_bits(stmpe, STMPE_REG_FIFO_STA,
	92	STMPE_FIFO_STA_RESET, 0);
	93	}
	94
	95	static void stmpe_work(struct work_struct *work)
	96	{
	97	int int_sta;
	98	u32 timeout = 40;
	99
	100	struct stmpe_touch *ts =
	101	container_of(work, struct stmpe_touch, work.work);
	102
	103	int_sta = stmpe_reg_read(ts->stmpe, STMPE_REG_INT_STA);
	104
	105	/*
	106	* touch_det sometimes get desasserted or just get stuck. This appears
	107	* to be a silicon bug, We still have to clearify this with the
	108	* manufacture. As a workaround We release the key anyway if the
	109	* touch_det keeps coming in after 4ms, while the FIFO contains no value
	110	* during the whole time.
	111	*/
	112	while ((int_sta & (1 << STMPE_IRQ_TOUCH_DET)) && (timeout > 0)) {
	113	timeout--;
	114	int_sta = stmpe_reg_read(ts->stmpe, STMPE_REG_INT_STA);
	115	udelay(100);
	116	}
	117
	118	/* reset the FIFO before we report release event */
	119	__stmpe_reset_fifo(ts->stmpe);
	120
	121	input_report_abs(ts->idev, ABS_PRESSURE, 0);
7488b1b9	122	input_report_key(ts->idev, BTN_TOUCH, 0);
f94add3b LF	123	input_sync(ts->idev);
	124	}
	125
	126	static irqreturn_t stmpe_ts_handler(int irq, void *data)
	127	{
	128	u8 data_set[4];
	129	int x, y, z;
	130	struct stmpe_touch *ts = data;
	131
	132	/*
	133	* Cancel scheduled polling for release if we have new value
	134	* available. Wait if the polling is already running.
	135	*/
	136	cancel_delayed_work_sync(&ts->work);
	137
	138	/*
	139	* The FIFO sometimes just crashes and stops generating interrupts. This
	140	* appears to be a silicon bug. We still have to clearify this with
	141	* the manufacture. As a workaround we disable the TSC while we are
	142	* collecting data and flush the FIFO after reading
	143	*/
	144	stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,
	145	STMPE_TSC_CTRL_TSC_EN, 0);
	146
	147	stmpe_block_read(ts->stmpe, STMPE_REG_TSC_DATA_XYZ, 4, data_set);
	148
	149	x = (data_set[0] << 4) \| (data_set[1] >> 4);
	150	y = ((data_set[1] & 0xf) << 8) \| data_set[2];
	151	z = data_set[3];
	152
	153	input_report_abs(ts->idev, ABS_X, x);
	154	input_report_abs(ts->idev, ABS_Y, y);
	155	input_report_abs(ts->idev, ABS_PRESSURE, z);
7488b1b9	156	input_report_key(ts->idev, BTN_TOUCH, 1);
f94add3b LF	157	input_sync(ts->idev);
	158
	159	/* flush the FIFO after we have read out our values. */
	160	__stmpe_reset_fifo(ts->stmpe);
	161
	162	/* reenable the tsc */
	163	stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,
	164	STMPE_TSC_CTRL_TSC_EN, STMPE_TSC_CTRL_TSC_EN);
	165
	166	/* start polling for touch_det to detect release */
9ceeb59c	167	schedule_delayed_work(&ts->work, msecs_to_jiffies(50));
f94add3b LF	168
	169	return IRQ_HANDLED;
	170	}
	171
5298cc4c	172	static int stmpe_init_hw(struct stmpe_touch *ts)
f94add3b LF	173	{
f94add3b LF	174	int ret;
88f29d0f	175	u8 tsc_cfg, tsc_cfg_mask;
f94add3b LF	176	struct stmpe *stmpe = ts->stmpe;
	177	struct device *dev = ts->dev;
	178
	179	ret = stmpe_enable(stmpe, STMPE_BLOCK_TOUCHSCREEN \| STMPE_BLOCK_ADC);
	180	if (ret) {
	181	dev_err(dev, "Could not enable clock for ADC and TS\n");
	182	return ret;
	183	}
	184
88f29d0f	185	ret = stmpe811_adc_common_init(stmpe);
f94add3b	186	if (ret) {
88f29d0f	187	stmpe_disable(stmpe, STMPE_BLOCK_TOUCHSCREEN \| STMPE_BLOCK_ADC);
f94add3b LF	188	return ret;
	189	}
	190
063755ab PS	191	tsc_cfg = STMPE_AVE_CTRL(ts->ave_ctrl) \|
	192	STMPE_DET_DELAY(ts->touch_det_delay) \|
	193	STMPE_SETTLING(ts->settling);
	194	tsc_cfg_mask = STMPE_AVE_CTRL(0xff) \| STMPE_DET_DELAY(0xff) \|
	195	STMPE_SETTLING(0xff);
f94add3b LF	196
	197	ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_CFG, tsc_cfg_mask, tsc_cfg);
	198	if (ret) {
	199	dev_err(dev, "Could not config touch\n");
	200	return ret;
	201	}
	202
	203	ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_FRACTION_Z,
063755ab	204	STMPE_FRACTION_Z(0xff), STMPE_FRACTION_Z(ts->fraction_z));
f94add3b LF	205	if (ret) {
	206	dev_err(dev, "Could not config touch\n");
	207	return ret;
	208	}
	209
	210	ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_I_DRIVE,
063755ab	211	STMPE_I_DRIVE(0xff), STMPE_I_DRIVE(ts->i_drive));
f94add3b LF	212	if (ret) {
	213	dev_err(dev, "Could not config touch\n");
	214	return ret;
	215	}
	216
	217	/* set FIFO to 1 for single point reading */
	218	ret = stmpe_reg_write(stmpe, STMPE_REG_FIFO_TH, 1);
	219	if (ret) {
	220	dev_err(dev, "Could not set FIFO\n");
	221	return ret;
	222	}
	223
	224	ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_CTRL,
063755ab	225	STMPE_OP_MODE(0xff), STMPE_OP_MODE(OP_MOD_XYZ));
f94add3b LF	226	if (ret) {
	227	dev_err(dev, "Could not set mode\n");
	228	return ret;
	229	}
	230
	231	return 0;
	232	}
	233
	234	static int stmpe_ts_open(struct input_dev *dev)
	235	{
	236	struct stmpe_touch *ts = input_get_drvdata(dev);
	237	int ret = 0;
	238
	239	ret = __stmpe_reset_fifo(ts->stmpe);
	240	if (ret)
	241	return ret;
	242
	243	return stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,
	244	STMPE_TSC_CTRL_TSC_EN, STMPE_TSC_CTRL_TSC_EN);
	245	}
	246
	247	static void stmpe_ts_close(struct input_dev *dev)
	248	{
	249	struct stmpe_touch *ts = input_get_drvdata(dev);
	250
	251	cancel_delayed_work_sync(&ts->work);
	252
	253	stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,
	254	STMPE_TSC_CTRL_TSC_EN, 0);
	255	}
	256
037db524 VKS	257	static void stmpe_ts_get_platform_info(struct platform_device *pdev,
037db524 VKS	258	struct stmpe_touch *ts)
f94add3b	259	{
037db524	260	struct device_node *np = pdev->dev.of_node;
e4b88e19	261	u32 val;
037db524	262
e4b88e19	263	if (np) {
037db524	264	if (!of_property_read_u32(np, "st,sample-time", &val))
88f29d0f	265	ts->stmpe->sample_time = val;
037db524	266	if (!of_property_read_u32(np, "st,mod-12b", &val))
88f29d0f	267	ts->stmpe->mod_12b = val;
037db524	268	if (!of_property_read_u32(np, "st,ref-sel", &val))
88f29d0f	269	ts->stmpe->ref_sel = val;
037db524	270	if (!of_property_read_u32(np, "st,adc-freq", &val))
88f29d0f	271	ts->stmpe->adc_freq = val;
037db524 VKS	272	if (!of_property_read_u32(np, "st,ave-ctrl", &val))
	273	ts->ave_ctrl = val;
	274	if (!of_property_read_u32(np, "st,touch-det-delay", &val))
	275	ts->touch_det_delay = val;
	276	if (!of_property_read_u32(np, "st,settling", &val))
	277	ts->settling = val;
	278	if (!of_property_read_u32(np, "st,fraction-z", &val))
	279	ts->fraction_z = val;
	280	if (!of_property_read_u32(np, "st,i-drive", &val))
	281	ts->i_drive = val;
	282	}
	283	}
	284
5298cc4c	285	static int stmpe_input_probe(struct platform_device *pdev)
037db524	286	{
e4b88e19	287	struct stmpe *stmpe = dev_get_drvdata(pdev->dev.parent);
f94add3b LF	288	struct stmpe_touch *ts;
f94add3b LF	289	struct input_dev *idev;
2bd942f9	290	int error;
3faeb35c	291	int ts_irq;
f94add3b LF	292
	293	ts_irq = platform_get_irq_byname(pdev, "FIFO_TH");
	294	if (ts_irq < 0)
	295	return ts_irq;
	296
2bd942f9 VK	297	ts = devm_kzalloc(&pdev->dev, sizeof(*ts), GFP_KERNEL);
	298	if (!ts)
	299	return -ENOMEM;
f94add3b	300
2bd942f9 VK	301	idev = devm_input_allocate_device(&pdev->dev);
	302	if (!idev)
	303	return -ENOMEM;
f94add3b LF	304
f94add3b LF	305	platform_set_drvdata(pdev, ts);
e4b88e19	306	ts->stmpe = stmpe;
f94add3b LF	307	ts->idev = idev;
	308	ts->dev = &pdev->dev;
	309
037db524	310	stmpe_ts_get_platform_info(pdev, ts);
f94add3b LF	311
	312	INIT_DELAYED_WORK(&ts->work, stmpe_work);
	313
2bd942f9 VK	314	error = devm_request_threaded_irq(&pdev->dev, ts_irq,
	315	NULL, stmpe_ts_handler,
	316	IRQF_ONESHOT, STMPE_TS_NAME, ts);
	317	if (error) {
f94add3b	318	dev_err(&pdev->dev, "Failed to request IRQ %d\n", ts_irq);
2bd942f9	319	return error;
f94add3b LF	320	}
f94add3b LF	321
2bd942f9 VK	322	error = stmpe_init_hw(ts);
	323	if (error)
	324	return error;
f94add3b LF	325
f94add3b LF	326	idev->name = STMPE_TS_NAME;
b8d52e2b	327	idev->phys = STMPE_TS_NAME"/input0";
f94add3b	328	idev->id.bustype = BUS_I2C;
f94add3b LF	329
	330	idev->open = stmpe_ts_open;
	331	idev->close = stmpe_ts_close;
	332
	333	input_set_drvdata(idev, ts);
	334
e4b88e19	335	input_set_capability(idev, EV_KEY, BTN_TOUCH);
f94add3b LF	336	input_set_abs_params(idev, ABS_X, 0, XY_MASK, 0, 0);
	337	input_set_abs_params(idev, ABS_Y, 0, XY_MASK, 0, 0);
	338	input_set_abs_params(idev, ABS_PRESSURE, 0x0, 0xff, 0, 0);
	339
2bd942f9 VK	340	error = input_register_device(idev);
2bd942f9 VK	341	if (error) {
f94add3b	342	dev_err(&pdev->dev, "Could not register input device\n");
2bd942f9	343	return error;
f94add3b LF	344	}
f94add3b LF	345
2bd942f9	346	return 0;
f94add3b LF	347	}
f94add3b LF	348
e2619cf7	349	static int stmpe_ts_remove(struct platform_device *pdev)
f94add3b LF	350	{
f94add3b LF	351	struct stmpe_touch *ts = platform_get_drvdata(pdev);
f94add3b LF	352
	353	stmpe_disable(ts->stmpe, STMPE_BLOCK_TOUCHSCREEN);
	354
f94add3b LF	355	return 0;
	356	}
	357
	358	static struct platform_driver stmpe_ts_driver = {
	359	.driver = {
f91a3f08 DT	360	.name = STMPE_TS_NAME,
f91a3f08 DT	361	},
f94add3b	362	.probe = stmpe_input_probe,
1cb0aa88	363	.remove = stmpe_ts_remove,
f94add3b	364	};
cdcc96e2	365	module_platform_driver(stmpe_ts_driver);
f94add3b	366
f91a3f08 DT	367	static const struct of_device_id stmpe_ts_ids[] = {
	368	{ .compatible = "st,stmpe-ts", },
	369	{ },
	370	};
	371	MODULE_DEVICE_TABLE(of, stmpe_ts_ids);
f91a3f08	372
f94add3b LF	373	MODULE_AUTHOR("Luotao Fu <l.fu@pengutronix.de>");
	374	MODULE_DESCRIPTION("STMPEXXX touchscreen driver");
	375	MODULE_LICENSE("GPL");