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

/* STMicroelectronics STMPE811 Touchscreen Driver
 *
 * (C) 2010 Luotao Fu <l.fu@pengutronix.de>
 * All rights reserved.
 *
 *  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.
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/device.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_ADC_CTRL1		0x20
#define STMPE_REG_ADC_CTRL2		0x21
#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 SAMPLE_TIME(x)			((x & 0xf) << 4)
#define MOD_12B(x)			((x & 0x1) << 3)
#define REF_SEL(x)			((x & 0x1) << 1)
#define ADC_FREQ(x)			(x & 0x3)
#define AVE_CTRL(x)			((x & 0x3) << 6)
#define DET_DELAY(x)			((x & 0x7) << 3)
#define SETTLING(x)			(x & 0x7)
#define FRACTION_Z(x)			(x & 0x7)
#define I_DRIVE(x)			(x & 0x1)
#define OP_MODE(x)			((x & 0x7) << 1)

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

struct stmpe_touch {
	struct stmpe *stmpe;
	struct input_dev *idev;
	struct delayed_work work;
	struct device *dev;
	u8 sample_time;
	u8 mod_12b;
	u8 ref_sel;
	u8 adc_freq;
	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_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_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, HZ / 50);

	return IRQ_HANDLED;
}

static int __devinit stmpe_init_hw(struct stmpe_touch *ts)
{
	int ret;
	u8 adc_ctrl1, adc_ctrl1_mask, 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;
	}

	adc_ctrl1 = SAMPLE_TIME(ts->sample_time) | MOD_12B(ts->mod_12b) |
		REF_SEL(ts->ref_sel);
	adc_ctrl1_mask = SAMPLE_TIME(0xff) | MOD_12B(0xff) | REF_SEL(0xff);

	ret = stmpe_set_bits(stmpe, STMPE_REG_ADC_CTRL1,
			adc_ctrl1_mask, adc_ctrl1);
	if (ret) {
		dev_err(dev, "Could not setup ADC\n");
		return ret;
	}

	ret = stmpe_set_bits(stmpe, STMPE_REG_ADC_CTRL2,
			ADC_FREQ(0xff), ADC_FREQ(ts->adc_freq));
	if (ret) {
		dev_err(dev, "Could not setup ADC\n");
		return ret;
	}

	tsc_cfg = AVE_CTRL(ts->ave_ctrl) | DET_DELAY(ts->touch_det_delay) |
			SETTLING(ts->settling);
	tsc_cfg_mask = AVE_CTRL(0xff) | DET_DELAY(0xff) | 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,
			FRACTION_Z(0xff), 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,
			I_DRIVE(0xff), 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,
			OP_MODE(0xff), 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 int __devinit stmpe_input_probe(struct platform_device *pdev)
{
	struct stmpe *stmpe = dev_get_drvdata(pdev->dev.parent);
	struct stmpe_platform_data *pdata = stmpe->pdata;
	struct stmpe_touch *ts;
	struct input_dev *idev;
	struct stmpe_ts_platform_data *ts_pdata = NULL;
	int ret = 0;
	int ts_irq;

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

	ts = kzalloc(sizeof(*ts), GFP_KERNEL);
	if (!ts)
		goto err_out;

	idev = input_allocate_device();
	if (!idev)
		goto err_free_ts;

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

	if (pdata)
		ts_pdata = pdata->ts;

	if (ts_pdata) {
		ts->sample_time = ts_pdata->sample_time;
		ts->mod_12b = ts_pdata->mod_12b;
		ts->ref_sel = ts_pdata->ref_sel;
		ts->adc_freq = ts_pdata->adc_freq;
		ts->ave_ctrl = ts_pdata->ave_ctrl;
		ts->touch_det_delay = ts_pdata->touch_det_delay;
		ts->settling = ts_pdata->settling;
		ts->fraction_z = ts_pdata->fraction_z;
		ts->i_drive = ts_pdata->i_drive;
	}

	INIT_DELAYED_WORK(&ts->work, stmpe_work);

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

	ret = stmpe_init_hw(ts);
	if (ret)
		goto err_free_irq;

	idev->name = STMPE_TS_NAME;
	idev->id.bustype = BUS_I2C;
	idev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
	idev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);

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

	input_set_drvdata(idev, ts);

	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);

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

	return ret;

err_free_irq:
	free_irq(ts_irq, ts);
err_free_input:
	input_free_device(idev);
	platform_set_drvdata(pdev, NULL);
err_free_ts:
	kfree(ts);
err_out:
	return ret;
}

static int __devexit stmpe_ts_remove(struct platform_device *pdev)
{
	struct stmpe_touch *ts = platform_get_drvdata(pdev);
	unsigned int ts_irq = platform_get_irq_byname(pdev, "FIFO_TH");

	stmpe_disable(ts->stmpe, STMPE_BLOCK_TOUCHSCREEN);

	free_irq(ts_irq, ts);

	platform_set_drvdata(pdev, NULL);

	input_unregister_device(ts->idev);

	kfree(ts);

	return 0;
}

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

static int __init stmpe_ts_init(void)
{
	return platform_driver_register(&stmpe_ts_driver);
}

module_init(stmpe_ts_init);

static void __exit stmpe_ts_exit(void)
{
	platform_driver_unregister(&stmpe_ts_driver);
}

module_exit(stmpe_ts_exit);

MODULE_AUTHOR("Luotao Fu <l.fu@pengutronix.de>");
MODULE_DESCRIPTION("STMPEXXX touchscreen driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" STMPE_TS_NAME);
Commit	Line	Data
f94add3b LF	1	/* STMicroelectronics STMPE811 Touchscreen Driver
	2	*
	3	* (C) 2010 Luotao Fu <l.fu@pengutronix.de>
	4	* All rights reserved.
	5	*
	6	* This program is free software; you can redistribute it and/or modify it
	7	* under the terms of the GNU General Public License as published by the
	8	* Free Software Foundation; either version 2 of the License, or (at your
	9	* option) any later version.
	10	*
	11	*/
	12
	13	#include <linux/kernel.h>
	14	#include <linux/module.h>
	15	#include <linux/sched.h>
	16	#include <linux/interrupt.h>
	17	#include <linux/init.h>
	18	#include <linux/device.h>
	19	#include <linux/platform_device.h>
	20	#include <linux/input.h>
	21	#include <linux/slab.h>
	22	#include <linux/delay.h>
	23	#include <linux/i2c.h>
	24	#include <linux/workqueue.h>
	25
	26	#include <linux/mfd/stmpe.h>
	27
	28	/* Register layouts and functionalities are identical on all stmpexxx variants
	29	* with touchscreen controller
	30	*/
	31	#define STMPE_REG_INT_STA 0x0B
	32	#define STMPE_REG_ADC_CTRL1 0x20
	33	#define STMPE_REG_ADC_CTRL2 0x21
	34	#define STMPE_REG_TSC_CTRL 0x40
	35	#define STMPE_REG_TSC_CFG 0x41
	36	#define STMPE_REG_FIFO_TH 0x4A
	37	#define STMPE_REG_FIFO_STA 0x4B
	38	#define STMPE_REG_FIFO_SIZE 0x4C
	39	#define STMPE_REG_TSC_DATA_XYZ 0x52
	40	#define STMPE_REG_TSC_FRACTION_Z 0x56
	41	#define STMPE_REG_TSC_I_DRIVE 0x58
	42
	43	#define OP_MOD_XYZ 0
	44
	45	#define STMPE_TSC_CTRL_TSC_EN (1<<0)
	46
	47	#define STMPE_FIFO_STA_RESET (1<<0)
	48
	49	#define STMPE_IRQ_TOUCH_DET 0
	50
	51	#define SAMPLE_TIME(x) ((x & 0xf) << 4)
	52	#define MOD_12B(x) ((x & 0x1) << 3)
	53	#define REF_SEL(x) ((x & 0x1) << 1)
	54	#define ADC_FREQ(x) (x & 0x3)
	55	#define AVE_CTRL(x) ((x & 0x3) << 6)
	56	#define DET_DELAY(x) ((x & 0x7) << 3)
	57	#define SETTLING(x) (x & 0x7)
	58	#define FRACTION_Z(x) (x & 0x7)
	59	#define I_DRIVE(x) (x & 0x1)
	60	#define OP_MODE(x) ((x & 0x7) << 1)
	61
	62	#define STMPE_TS_NAME "stmpe-ts"
	63	#define XY_MASK 0xfff
	64
65	struct stmpe_touch {
66	struct stmpe *stmpe;
67	struct input_dev *idev;
68	struct delayed_work work;
69	struct device *dev;
70	u8 sample_time;
71	u8 mod_12b;
72	u8 ref_sel;
73	u8 adc_freq;
74	u8 ave_ctrl;
75	u8 touch_det_delay;
76	u8 settling;
77	u8 fraction_z;
78	u8 i_drive;
79	};
80
81	static int __stmpe_reset_fifo(struct stmpe *stmpe)
82	{
83	int ret;
84
85	ret = stmpe_set_bits(stmpe, STMPE_REG_FIFO_STA,
86	STMPE_FIFO_STA_RESET, STMPE_FIFO_STA_RESET);
87	if (ret)
88	return ret;
89
90	return stmpe_set_bits(stmpe, STMPE_REG_FIFO_STA,
91	STMPE_FIFO_STA_RESET, 0);
92	}
93
94	static void stmpe_work(struct work_struct *work)
95	{
96	int int_sta;
97	u32 timeout = 40;
98
99	struct stmpe_touch *ts =
100	container_of(work, struct stmpe_touch, work.work);
101
102	int_sta = stmpe_reg_read(ts->stmpe, STMPE_REG_INT_STA);
103
104	/*
105	* touch_det sometimes get desasserted or just get stuck. This appears
106	* to be a silicon bug, We still have to clearify this with the
107	* manufacture. As a workaround We release the key anyway if the
108	* touch_det keeps coming in after 4ms, while the FIFO contains no value
109	* during the whole time.
110	*/
111	while ((int_sta & (1 << STMPE_IRQ_TOUCH_DET)) && (timeout > 0)) {
112	timeout--;
113	int_sta = stmpe_reg_read(ts->stmpe, STMPE_REG_INT_STA);
114	udelay(100);
115	}
116
117	/* reset the FIFO before we report release event */
118	__stmpe_reset_fifo(ts->stmpe);
119
120	input_report_abs(ts->idev, ABS_PRESSURE, 0);
121	input_sync(ts->idev);
122	}
123
124	static irqreturn_t stmpe_ts_handler(int irq, void *data)
125	{
126	u8 data_set[4];
127	int x, y, z;
128	struct stmpe_touch *ts = data;
129
130	/*
131	* Cancel scheduled polling for release if we have new value
132	* available. Wait if the polling is already running.
133	*/
134	cancel_delayed_work_sync(&ts->work);
135
136	/*
137	* The FIFO sometimes just crashes and stops generating interrupts. This
138	* appears to be a silicon bug. We still have to clearify this with
139	* the manufacture. As a workaround we disable the TSC while we are
140	* collecting data and flush the FIFO after reading
141	*/
142	stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,
143	STMPE_TSC_CTRL_TSC_EN, 0);
144
145	stmpe_block_read(ts->stmpe, STMPE_REG_TSC_DATA_XYZ, 4, data_set);
146
147	x = (data_set[0] << 4) \| (data_set[1] >> 4);
148	y = ((data_set[1] & 0xf) << 8) \| data_set[2];
149	z = data_set[3];
150
151	input_report_abs(ts->idev, ABS_X, x);
152	input_report_abs(ts->idev, ABS_Y, y);
153	input_report_abs(ts->idev, ABS_PRESSURE, z);
154	input_sync(ts->idev);
155
156	/* flush the FIFO after we have read out our values. */
157	__stmpe_reset_fifo(ts->stmpe);
158
159	/* reenable the tsc */
160	stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,
161	STMPE_TSC_CTRL_TSC_EN, STMPE_TSC_CTRL_TSC_EN);
162
163	/* start polling for touch_det to detect release */
164	schedule_delayed_work(&ts->work, HZ / 50);
165
166	return IRQ_HANDLED;
167	}
168
169	static int __devinit stmpe_init_hw(struct stmpe_touch *ts)
170	{
171	int ret;
172	u8 adc_ctrl1, adc_ctrl1_mask, tsc_cfg, tsc_cfg_mask;
173	struct stmpe *stmpe = ts->stmpe;
174	struct device *dev = ts->dev;
175
176	ret = stmpe_enable(stmpe, STMPE_BLOCK_TOUCHSCREEN \| STMPE_BLOCK_ADC);
177	if (ret) {
178	dev_err(dev, "Could not enable clock for ADC and TS\n");
179	return ret;
180	}
181
182	adc_ctrl1 = SAMPLE_TIME(ts->sample_time) \| MOD_12B(ts->mod_12b) \|
183	REF_SEL(ts->ref_sel);
184	adc_ctrl1_mask = SAMPLE_TIME(0xff) \| MOD_12B(0xff) \| REF_SEL(0xff);
185
186	ret = stmpe_set_bits(stmpe, STMPE_REG_ADC_CTRL1,
187	adc_ctrl1_mask, adc_ctrl1);
188	if (ret) {
189	dev_err(dev, "Could not setup ADC\n");
190	return ret;
191	}
192
193	ret = stmpe_set_bits(stmpe, STMPE_REG_ADC_CTRL2,
194	ADC_FREQ(0xff), ADC_FREQ(ts->adc_freq));
195	if (ret) {
196	dev_err(dev, "Could not setup ADC\n");
197	return ret;
198	}
199
200	tsc_cfg = AVE_CTRL(ts->ave_ctrl) \| DET_DELAY(ts->touch_det_delay) \|
201	SETTLING(ts->settling);
202	tsc_cfg_mask = AVE_CTRL(0xff) \| DET_DELAY(0xff) \| SETTLING(0xff);
203
204	ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_CFG, tsc_cfg_mask, tsc_cfg);
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_FRACTION_Z,
211	FRACTION_Z(0xff), FRACTION_Z(ts->fraction_z));
212	if (ret) {
213	dev_err(dev, "Could not config touch\n");
214	return ret;
215	}
216
217	ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_I_DRIVE,
218	I_DRIVE(0xff), I_DRIVE(ts->i_drive));
219	if (ret) {
220	dev_err(dev, "Could not config touch\n");
221	return ret;
222	}
223
224	/* set FIFO to 1 for single point reading */
225	ret = stmpe_reg_write(stmpe, STMPE_REG_FIFO_TH, 1);
226	if (ret) {
227	dev_err(dev, "Could not set FIFO\n");
228	return ret;
229	}
230
231	ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_CTRL,
232	OP_MODE(0xff), OP_MODE(OP_MOD_XYZ));
233	if (ret) {
234	dev_err(dev, "Could not set mode\n");
235	return ret;
236	}
237
238	return 0;
239	}
240
241	static int stmpe_ts_open(struct input_dev *dev)
242	{
243	struct stmpe_touch *ts = input_get_drvdata(dev);
244	int ret = 0;
245
246	ret = __stmpe_reset_fifo(ts->stmpe);
247	if (ret)
248	return ret;
249
250	return stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,
251	STMPE_TSC_CTRL_TSC_EN, STMPE_TSC_CTRL_TSC_EN);
252	}
253
254	static void stmpe_ts_close(struct input_dev *dev)
255	{
256	struct stmpe_touch *ts = input_get_drvdata(dev);
257
258	cancel_delayed_work_sync(&ts->work);
259
260	stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,
261	STMPE_TSC_CTRL_TSC_EN, 0);
262	}
263
264	static int __devinit stmpe_input_probe(struct platform_device *pdev)
265	{
266	struct stmpe *stmpe = dev_get_drvdata(pdev->dev.parent);
267	struct stmpe_platform_data *pdata = stmpe->pdata;
268	struct stmpe_touch *ts;
269	struct input_dev *idev;
270	struct stmpe_ts_platform_data *ts_pdata = NULL;
271	int ret = 0;
3faeb35c	272	int ts_irq;
f94add3b LF	273
	274	ts_irq = platform_get_irq_byname(pdev, "FIFO_TH");
	275	if (ts_irq < 0)
	276	return ts_irq;
	277
	278	ts = kzalloc(sizeof(*ts), GFP_KERNEL);
	279	if (!ts)
	280	goto err_out;
	281
	282	idev = input_allocate_device();
	283	if (!idev)
	284	goto err_free_ts;
	285
	286	platform_set_drvdata(pdev, ts);
	287	ts->stmpe = stmpe;
	288	ts->idev = idev;
	289	ts->dev = &pdev->dev;
	290
	291	if (pdata)
	292	ts_pdata = pdata->ts;
	293
	294	if (ts_pdata) {
	295	ts->sample_time = ts_pdata->sample_time;
	296	ts->mod_12b = ts_pdata->mod_12b;
	297	ts->ref_sel = ts_pdata->ref_sel;
	298	ts->adc_freq = ts_pdata->adc_freq;
	299	ts->ave_ctrl = ts_pdata->ave_ctrl;
	300	ts->touch_det_delay = ts_pdata->touch_det_delay;
	301	ts->settling = ts_pdata->settling;
	302	ts->fraction_z = ts_pdata->fraction_z;
	303	ts->i_drive = ts_pdata->i_drive;
	304	}
	305
	306	INIT_DELAYED_WORK(&ts->work, stmpe_work);
	307
	308	ret = request_threaded_irq(ts_irq, NULL, stmpe_ts_handler,
	309	IRQF_ONESHOT, STMPE_TS_NAME, ts);
	310	if (ret) {
	311	dev_err(&pdev->dev, "Failed to request IRQ %d\n", ts_irq);
	312	goto err_free_input;
	313	}
	314
	315	ret = stmpe_init_hw(ts);
	316	if (ret)
	317	goto err_free_irq;
	318
	319	idev->name = STMPE_TS_NAME;
	320	idev->id.bustype = BUS_I2C;
	321	idev->evbit[0] = BIT_MASK(EV_KEY) \| BIT_MASK(EV_ABS);
	322	idev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
	323
	324	idev->open = stmpe_ts_open;
	325	idev->close = stmpe_ts_close;
	326
	327	input_set_drvdata(idev, ts);
	328
	329	input_set_abs_params(idev, ABS_X, 0, XY_MASK, 0, 0);
	330	input_set_abs_params(idev, ABS_Y, 0, XY_MASK, 0, 0);
	331	input_set_abs_params(idev, ABS_PRESSURE, 0x0, 0xff, 0, 0);
	332
	333	ret = input_register_device(idev);
	334	if (ret) {
	335	dev_err(&pdev->dev, "Could not register input device\n");
	336	goto err_free_irq;
337	}
338
339	return ret;
340
341	err_free_irq:
342	free_irq(ts_irq, ts);
343	err_free_input:
344	input_free_device(idev);
345	platform_set_drvdata(pdev, NULL);
346	err_free_ts:
347	kfree(ts);
348	err_out:
349	return ret;
350	}
351
352	static int __devexit stmpe_ts_remove(struct platform_device *pdev)
353	{
354	struct stmpe_touch *ts = platform_get_drvdata(pdev);
355	unsigned int ts_irq = platform_get_irq_byname(pdev, "FIFO_TH");
356
357	stmpe_disable(ts->stmpe, STMPE_BLOCK_TOUCHSCREEN);
358
359	free_irq(ts_irq, ts);
360
361	platform_set_drvdata(pdev, NULL);
362
363	input_unregister_device(ts->idev);
f94add3b LF	364
	365	kfree(ts);
	366
	367	return 0;
	368	}
	369
	370	static struct platform_driver stmpe_ts_driver = {
	371	.driver = {
	372	.name = STMPE_TS_NAME,
	373	.owner = THIS_MODULE,
	374	},
	375	.probe = stmpe_input_probe,
	376	.remove = __devexit_p(stmpe_ts_remove),
	377	};
	378
	379	static int __init stmpe_ts_init(void)
	380	{
	381	return platform_driver_register(&stmpe_ts_driver);
	382	}
	383
	384	module_init(stmpe_ts_init);
	385
	386	static void __exit stmpe_ts_exit(void)
	387	{
	388	platform_driver_unregister(&stmpe_ts_driver);
	389	}
	390
	391	module_exit(stmpe_ts_exit);
	392
	393	MODULE_AUTHOR("Luotao Fu <l.fu@pengutronix.de>");
	394	MODULE_DESCRIPTION("STMPEXXX touchscreen driver");
	395	MODULE_LICENSE("GPL");
	396	MODULE_ALIAS("platform:" STMPE_TS_NAME);