[deliverable/linux.git] / drivers / input / touchscreen / tps6507x-ts.c

/*
 * Touchscreen driver for the tps6507x chip.
 *
 * Copyright (c) 2009 RidgeRun (todd.fischer@ridgerun.com)
 *
 * Credits:
 *
 *    Using code from tsc2007, MtekVision Co., Ltd.
 *
 * For licencing details see kernel-base/COPYING
 *
 * TPS65070, TPS65073, TPS650731, and TPS650732 support
 * 10 bit touch screen interface.
 */

#include <linux/module.h>
#include <linux/workqueue.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/input-polldev.h>
#include <linux/platform_device.h>
#include <linux/mfd/tps6507x.h>
#include <linux/input/tps6507x-ts.h>
#include <linux/delay.h>

#define TSC_DEFAULT_POLL_PERIOD 30 /* ms */
#define TPS_DEFAULT_MIN_PRESSURE 0x30
#define MAX_10BIT ((1 << 10) - 1)

#define	TPS6507X_ADCONFIG_CONVERT_TS (TPS6507X_ADCONFIG_AD_ENABLE | \
					 TPS6507X_ADCONFIG_START_CONVERSION | \
					 TPS6507X_ADCONFIG_INPUT_REAL_TSC)
#define	TPS6507X_ADCONFIG_POWER_DOWN_TS (TPS6507X_ADCONFIG_INPUT_REAL_TSC)

struct ts_event {
	u16	x;
	u16	y;
	u16	pressure;
};

struct tps6507x_ts {
	struct device		*dev;
	struct input_polled_dev	*poll_dev;
	struct tps6507x_dev	*mfd;
	char			phys[32];
	struct ts_event		tc;
	u16			min_pressure;
	bool			pendown;
};

static int tps6507x_read_u8(struct tps6507x_ts *tsc, u8 reg, u8 *data)
{
	int err;

	err = tsc->mfd->read_dev(tsc->mfd, reg, 1, data);

	if (err)
		return err;

	return 0;
}

static int tps6507x_write_u8(struct tps6507x_ts *tsc, u8 reg, u8 data)
{
	return tsc->mfd->write_dev(tsc->mfd, reg, 1, &data);
}

static s32 tps6507x_adc_conversion(struct tps6507x_ts *tsc,
				   u8 tsc_mode, u16 *value)
{
	s32 ret;
	u8 adc_status;
	u8 result;

	/* Route input signal to A/D converter */

	ret = tps6507x_write_u8(tsc, TPS6507X_REG_TSCMODE, tsc_mode);
	if (ret) {
		dev_err(tsc->dev, "TSC mode read failed\n");
		goto err;
	}

	/* Start A/D conversion */

	ret = tps6507x_write_u8(tsc, TPS6507X_REG_ADCONFIG,
				TPS6507X_ADCONFIG_CONVERT_TS);
	if (ret) {
		dev_err(tsc->dev, "ADC config write failed\n");
		return ret;
	}

	do {
		ret = tps6507x_read_u8(tsc, TPS6507X_REG_ADCONFIG,
				       &adc_status);
		if (ret) {
			dev_err(tsc->dev, "ADC config read failed\n");
			goto err;
		}
	} while (adc_status & TPS6507X_ADCONFIG_START_CONVERSION);

	ret = tps6507x_read_u8(tsc, TPS6507X_REG_ADRESULT_2, &result);
	if (ret) {
		dev_err(tsc->dev, "ADC result 2 read failed\n");
		goto err;
	}

	*value = (result & TPS6507X_REG_ADRESULT_2_MASK) << 8;

	ret = tps6507x_read_u8(tsc, TPS6507X_REG_ADRESULT_1, &result);
	if (ret) {
		dev_err(tsc->dev, "ADC result 1 read failed\n");
		goto err;
	}

	*value |= result;

	dev_dbg(tsc->dev, "TSC channel %d = 0x%X\n", tsc_mode, *value);

err:
	return ret;
}

/* Need to call tps6507x_adc_standby() after using A/D converter for the
 * touch screen interrupt to work properly.
 */

static s32 tps6507x_adc_standby(struct tps6507x_ts *tsc)
{
	s32 ret;
	s32 loops = 0;
	u8 val;

	ret = tps6507x_write_u8(tsc,  TPS6507X_REG_ADCONFIG,
				TPS6507X_ADCONFIG_INPUT_TSC);
	if (ret)
		return ret;

	ret = tps6507x_write_u8(tsc, TPS6507X_REG_TSCMODE,
				TPS6507X_TSCMODE_STANDBY);
	if (ret)
		return ret;

	ret = tps6507x_read_u8(tsc, TPS6507X_REG_INT, &val);
	if (ret)
		return ret;

	while (val & TPS6507X_REG_TSC_INT) {
		mdelay(10);
		ret = tps6507x_read_u8(tsc, TPS6507X_REG_INT, &val);
		if (ret)
			return ret;
		loops++;
	}

	return ret;
}

static void tps6507x_ts_poll(struct input_polled_dev *poll_dev)
{
	struct tps6507x_ts *tsc = poll_dev->private;
	struct input_dev *input_dev = poll_dev->input;
	bool pendown;
	s32 ret;

	ret = tps6507x_adc_conversion(tsc, TPS6507X_TSCMODE_PRESSURE,
				      &tsc->tc.pressure);
	if (ret)
		goto done;

	pendown = tsc->tc.pressure > tsc->min_pressure;

	if (unlikely(!pendown && tsc->pendown)) {
		dev_dbg(tsc->dev, "UP\n");
		input_report_key(input_dev, BTN_TOUCH, 0);
		input_report_abs(input_dev, ABS_PRESSURE, 0);
		input_sync(input_dev);
		tsc->pendown = false;
	}

	if (pendown) {

		if (!tsc->pendown) {
			dev_dbg(tsc->dev, "DOWN\n");
			input_report_key(input_dev, BTN_TOUCH, 1);
		} else
			dev_dbg(tsc->dev, "still down\n");

		ret =  tps6507x_adc_conversion(tsc, TPS6507X_TSCMODE_X_POSITION,
					       &tsc->tc.x);
		if (ret)
			goto done;

		ret =  tps6507x_adc_conversion(tsc, TPS6507X_TSCMODE_Y_POSITION,
					       &tsc->tc.y);
		if (ret)
			goto done;

		input_report_abs(input_dev, ABS_X, tsc->tc.x);
		input_report_abs(input_dev, ABS_Y, tsc->tc.y);
		input_report_abs(input_dev, ABS_PRESSURE, tsc->tc.pressure);
		input_sync(input_dev);
		tsc->pendown = true;
	}

done:
	tps6507x_adc_standby(tsc);
}

static int tps6507x_ts_probe(struct platform_device *pdev)
{
	struct tps6507x_dev *tps6507x_dev = dev_get_drvdata(pdev->dev.parent);
	const struct tps6507x_board *tps_board;
	const struct touchscreen_init_data *init_data;
	struct tps6507x_ts *tsc;
	struct input_polled_dev *poll_dev;
	struct input_dev *input_dev;
	int error;

	/*
	 * tps_board points to pmic related constants
	 * coming from the board-evm file.
	 */
	tps_board = dev_get_platdata(tps6507x_dev->dev);
	if (!tps_board) {
		dev_err(tps6507x_dev->dev,
			"Could not find tps6507x platform data\n");
		return -ENODEV;
	}

	/*
	 * init_data points to array of regulator_init structures
	 * coming from the board-evm file.
	 */
	init_data = tps_board->tps6507x_ts_init_data;

	tsc = kzalloc(sizeof(struct tps6507x_ts), GFP_KERNEL);
	if (!tsc) {
		dev_err(tps6507x_dev->dev, "failed to allocate driver data\n");
		return -ENOMEM;
	}

	tsc->mfd = tps6507x_dev;
	tsc->dev = tps6507x_dev->dev;
	tsc->min_pressure = init_data ?
			init_data->min_pressure : TPS_DEFAULT_MIN_PRESSURE;

	snprintf(tsc->phys, sizeof(tsc->phys),
		 "%s/input0", dev_name(tsc->dev));

	poll_dev = input_allocate_polled_device();
	if (!poll_dev) {
		dev_err(tsc->dev, "Failed to allocate polled input device.\n");
		error = -ENOMEM;
		goto err_free_mem;
	}

	tsc->poll_dev = poll_dev;

	poll_dev->private = tsc;
	poll_dev->poll = tps6507x_ts_poll;
	poll_dev->poll_interval = init_data ?
			init_data->poll_period : TSC_DEFAULT_POLL_PERIOD;

	input_dev = poll_dev->input;
	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
	input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);

	input_set_abs_params(input_dev, ABS_X, 0, MAX_10BIT, 0, 0);
	input_set_abs_params(input_dev, ABS_Y, 0, MAX_10BIT, 0, 0);
	input_set_abs_params(input_dev, ABS_PRESSURE, 0, MAX_10BIT, 0, 0);

	input_dev->name = "TPS6507x Touchscreen";
	input_dev->phys = tsc->phys;
	input_dev->dev.parent = tsc->dev;
	input_dev->id.bustype = BUS_I2C;
	if (init_data) {
		input_dev->id.vendor = init_data->vendor;
		input_dev->id.product = init_data->product;
		input_dev->id.version = init_data->version;
	}

	error = tps6507x_adc_standby(tsc);
	if (error)
		goto err_free_polled_dev;

	error = input_register_polled_device(poll_dev);
	if (error)
		goto err_free_polled_dev;

	platform_set_drvdata(pdev, tsc);

	return 0;

err_free_polled_dev:
	input_free_polled_device(poll_dev);
err_free_mem:
	kfree(tsc);
	return error;
}

static int tps6507x_ts_remove(struct platform_device *pdev)
{
	struct tps6507x_ts *tsc = platform_get_drvdata(pdev);
	struct input_polled_dev *poll_dev = tsc->poll_dev;

	input_unregister_polled_device(poll_dev);
	input_free_polled_device(poll_dev);

	kfree(tsc);

	return 0;
}

static struct platform_driver tps6507x_ts_driver = {
	.driver = {
		.name = "tps6507x-ts",
	},
	.probe = tps6507x_ts_probe,
	.remove = tps6507x_ts_remove,
};
module_platform_driver(tps6507x_ts_driver);

MODULE_AUTHOR("Todd Fischer <todd.fischer@ridgerun.com>");
MODULE_DESCRIPTION("TPS6507x - TouchScreen driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:tps6507x-ts");
Commit	Line	Data
75259966	1	/*
75259966 TF	2	* Touchscreen driver for the tps6507x chip.
	3	*
	4	* Copyright (c) 2009 RidgeRun (todd.fischer@ridgerun.com)
	5	*
	6	* Credits:
	7	*
	8	* Using code from tsc2007, MtekVision Co., Ltd.
	9	*
	10	* For licencing details see kernel-base/COPYING
	11	*
	12	* TPS65070, TPS65073, TPS650731, and TPS650732 support
	13	* 10 bit touch screen interface.
	14	*/
	15
	16	#include <linux/module.h>
	17	#include <linux/workqueue.h>
	18	#include <linux/slab.h>
	19	#include <linux/input.h>
5705b8ac	20	#include <linux/input-polldev.h>
75259966 TF	21	#include <linux/platform_device.h>
	22	#include <linux/mfd/tps6507x.h>
	23	#include <linux/input/tps6507x-ts.h>
	24	#include <linux/delay.h>
	25
	26	#define TSC_DEFAULT_POLL_PERIOD 30 /* ms */
	27	#define TPS_DEFAULT_MIN_PRESSURE 0x30
	28	#define MAX_10BIT ((1 << 10) - 1)
	29
	30	#define TPS6507X_ADCONFIG_CONVERT_TS (TPS6507X_ADCONFIG_AD_ENABLE \| \
	31	TPS6507X_ADCONFIG_START_CONVERSION \| \
	32	TPS6507X_ADCONFIG_INPUT_REAL_TSC)
	33	#define TPS6507X_ADCONFIG_POWER_DOWN_TS (TPS6507X_ADCONFIG_INPUT_REAL_TSC)
	34
	35	struct ts_event {
	36	u16 x;
	37	u16 y;
	38	u16 pressure;
	39	};
	40
	41	struct tps6507x_ts {
75259966	42	struct device *dev;
5705b8ac DT	43	struct input_polled_dev *poll_dev;
5705b8ac DT	44	struct tps6507x_dev *mfd;
75259966	45	char phys[32];
75259966	46	struct ts_event tc;
02a71600	47	u16 min_pressure;
02a71600	48	bool pendown;
75259966 TF	49	};
	50
	51	static int tps6507x_read_u8(struct tps6507x_ts tsc, u8 reg, u8 data)
	52	{
	53	int err;
	54
	55	err = tsc->mfd->read_dev(tsc->mfd, reg, 1, data);
	56
	57	if (err)
	58	return err;
	59
	60	return 0;
	61	}
	62
	63	static int tps6507x_write_u8(struct tps6507x_ts *tsc, u8 reg, u8 data)
	64	{
	65	return tsc->mfd->write_dev(tsc->mfd, reg, 1, &data);
	66	}
	67
	68	static s32 tps6507x_adc_conversion(struct tps6507x_ts *tsc,
	69	u8 tsc_mode, u16 *value)
	70	{
	71	s32 ret;
	72	u8 adc_status;
	73	u8 result;
	74
	75	/* Route input signal to A/D converter */
	76
	77	ret = tps6507x_write_u8(tsc, TPS6507X_REG_TSCMODE, tsc_mode);
	78	if (ret) {
	79	dev_err(tsc->dev, "TSC mode read failed\n");
	80	goto err;
	81	}
	82
	83	/* Start A/D conversion */
	84
	85	ret = tps6507x_write_u8(tsc, TPS6507X_REG_ADCONFIG,
	86	TPS6507X_ADCONFIG_CONVERT_TS);
	87	if (ret) {
	88	dev_err(tsc->dev, "ADC config write failed\n");
	89	return ret;
	90	}
	91
	92	do {
	93	ret = tps6507x_read_u8(tsc, TPS6507X_REG_ADCONFIG,
	94	&adc_status);
	95	if (ret) {
	96	dev_err(tsc->dev, "ADC config read failed\n");
	97	goto err;
	98	}
	99	} while (adc_status & TPS6507X_ADCONFIG_START_CONVERSION);
	100
	101	ret = tps6507x_read_u8(tsc, TPS6507X_REG_ADRESULT_2, &result);
	102	if (ret) {
	103	dev_err(tsc->dev, "ADC result 2 read failed\n");
	104	goto err;
	105	}
	106
	107	*value = (result & TPS6507X_REG_ADRESULT_2_MASK) << 8;
	108
	109	ret = tps6507x_read_u8(tsc, TPS6507X_REG_ADRESULT_1, &result);
	110	if (ret) {
	111	dev_err(tsc->dev, "ADC result 1 read failed\n");
	112	goto err;
113	}
114
115	*value \|= result;
116
117	dev_dbg(tsc->dev, "TSC channel %d = 0x%X\n", tsc_mode, *value);
118
119	err:
120	return ret;
121	}
122
123	/* Need to call tps6507x_adc_standby() after using A/D converter for the
124	* touch screen interrupt to work properly.
125	*/
126
127	static s32 tps6507x_adc_standby(struct tps6507x_ts *tsc)
128	{
129	s32 ret;
130	s32 loops = 0;
131	u8 val;
132
133	ret = tps6507x_write_u8(tsc, TPS6507X_REG_ADCONFIG,
134	TPS6507X_ADCONFIG_INPUT_TSC);
135	if (ret)
136	return ret;
137
138	ret = tps6507x_write_u8(tsc, TPS6507X_REG_TSCMODE,
139	TPS6507X_TSCMODE_STANDBY);
140	if (ret)
141	return ret;
142
143	ret = tps6507x_read_u8(tsc, TPS6507X_REG_INT, &val);
144	if (ret)
145	return ret;
146
147	while (val & TPS6507X_REG_TSC_INT) {
148	mdelay(10);
149	ret = tps6507x_read_u8(tsc, TPS6507X_REG_INT, &val);
150	if (ret)
151	return ret;
152	loops++;
153	}
154
155	return ret;
156	}
157
5705b8ac	158	static void tps6507x_ts_poll(struct input_polled_dev *poll_dev)
75259966	159	{
5705b8ac DT	160	struct tps6507x_ts *tsc = poll_dev->private;
5705b8ac DT	161	struct input_dev *input_dev = poll_dev->input;
02a71600	162	bool pendown;
75259966 TF	163	s32 ret;
75259966 TF	164
02a71600 DT	165	ret = tps6507x_adc_conversion(tsc, TPS6507X_TSCMODE_PRESSURE,
02a71600 DT	166	&tsc->tc.pressure);
75259966 TF	167	if (ret)
	168	goto done;
	169
	170	pendown = tsc->tc.pressure > tsc->min_pressure;
	171
	172	if (unlikely(!pendown && tsc->pendown)) {
	173	dev_dbg(tsc->dev, "UP\n");
	174	input_report_key(input_dev, BTN_TOUCH, 0);
	175	input_report_abs(input_dev, ABS_PRESSURE, 0);
	176	input_sync(input_dev);
02a71600	177	tsc->pendown = false;
75259966 TF	178	}
	179
	180	if (pendown) {
	181
	182	if (!tsc->pendown) {
	183	dev_dbg(tsc->dev, "DOWN\n");
	184	input_report_key(input_dev, BTN_TOUCH, 1);
	185	} else
	186	dev_dbg(tsc->dev, "still down\n");
	187
	188	ret = tps6507x_adc_conversion(tsc, TPS6507X_TSCMODE_X_POSITION,
	189	&tsc->tc.x);
	190	if (ret)
	191	goto done;
	192
	193	ret = tps6507x_adc_conversion(tsc, TPS6507X_TSCMODE_Y_POSITION,
	194	&tsc->tc.y);
	195	if (ret)
	196	goto done;
	197
	198	input_report_abs(input_dev, ABS_X, tsc->tc.x);
	199	input_report_abs(input_dev, ABS_Y, tsc->tc.y);
	200	input_report_abs(input_dev, ABS_PRESSURE, tsc->tc.pressure);
	201	input_sync(input_dev);
02a71600	202	tsc->pendown = true;
75259966 TF	203	}
	204
	205	done:
5705b8ac	206	tps6507x_adc_standby(tsc);
75259966 TF	207	}
	208
	209	static int tps6507x_ts_probe(struct platform_device *pdev)
	210	{
75259966	211	struct tps6507x_dev *tps6507x_dev = dev_get_drvdata(pdev->dev.parent);
5705b8ac DT	212	const struct tps6507x_board *tps_board;
	213	const struct touchscreen_init_data *init_data;
	214	struct tps6507x_ts *tsc;
	215	struct input_polled_dev *poll_dev;
75259966	216	struct input_dev *input_dev;
5705b8ac	217	int error;
75259966	218
5705b8ac	219	/*
75259966 TF	220	* tps_board points to pmic related constants
	221	* coming from the board-evm file.
	222	*/
5705b8ac	223	tps_board = dev_get_platdata(tps6507x_dev->dev);
75259966 TF	224	if (!tps_board) {
	225	dev_err(tps6507x_dev->dev,
	226	"Could not find tps6507x platform data\n");
5705b8ac	227	return -ENODEV;
75259966 TF	228	}
75259966 TF	229
5705b8ac	230	/*
75259966 TF	231	* init_data points to array of regulator_init structures
	232	* coming from the board-evm file.
	233	*/
75259966 TF	234	init_data = tps_board->tps6507x_ts_init_data;
	235
	236	tsc = kzalloc(sizeof(struct tps6507x_ts), GFP_KERNEL);
	237	if (!tsc) {
	238	dev_err(tps6507x_dev->dev, "failed to allocate driver data\n");
5705b8ac	239	return -ENOMEM;
75259966 TF	240	}
75259966 TF	241
75259966 TF	242	tsc->mfd = tps6507x_dev;
75259966 TF	243	tsc->dev = tps6507x_dev->dev;
5705b8ac DT	244	tsc->min_pressure = init_data ?
	245	init_data->min_pressure : TPS_DEFAULT_MIN_PRESSURE;
	246
	247	snprintf(tsc->phys, sizeof(tsc->phys),
	248	"%s/input0", dev_name(tsc->dev));
	249
	250	poll_dev = input_allocate_polled_device();
	251	if (!poll_dev) {
	252	dev_err(tsc->dev, "Failed to allocate polled input device.\n");
75259966	253	error = -ENOMEM;
5705b8ac	254	goto err_free_mem;
75259966 TF	255	}
75259966 TF	256
5705b8ac DT	257	tsc->poll_dev = poll_dev;
	258
	259	poll_dev->private = tsc;
	260	poll_dev->poll = tps6507x_ts_poll;
	261	poll_dev->poll_interval = init_data ?
	262	init_data->poll_period : TSC_DEFAULT_POLL_PERIOD;
	263
	264	input_dev = poll_dev->input;
75259966 TF	265	input_dev->evbit[0] = BIT_MASK(EV_KEY) \| BIT_MASK(EV_ABS);
	266	input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
	267
	268	input_set_abs_params(input_dev, ABS_X, 0, MAX_10BIT, 0, 0);
	269	input_set_abs_params(input_dev, ABS_Y, 0, MAX_10BIT, 0, 0);
	270	input_set_abs_params(input_dev, ABS_PRESSURE, 0, MAX_10BIT, 0, 0);
	271
	272	input_dev->name = "TPS6507x Touchscreen";
75259966	273	input_dev->phys = tsc->phys;
5705b8ac DT	274	input_dev->dev.parent = tsc->dev;
5705b8ac DT	275	input_dev->id.bustype = BUS_I2C;
75259966	276	if (init_data) {
75259966 TF	277	input_dev->id.vendor = init_data->vendor;
	278	input_dev->id.product = init_data->product;
	279	input_dev->id.version = init_data->version;
75259966 TF	280	}
	281
	282	error = tps6507x_adc_standby(tsc);
	283	if (error)
5705b8ac	284	goto err_free_polled_dev;
75259966	285
5705b8ac	286	error = input_register_polled_device(poll_dev);
75259966	287	if (error)
5705b8ac	288	goto err_free_polled_dev;
75259966	289
5705b8ac	290	platform_set_drvdata(pdev, tsc);
75259966 TF	291
	292	return 0;
	293
5705b8ac DT	294	err_free_polled_dev:
	295	input_free_polled_device(poll_dev);
	296	err_free_mem:
75259966	297	kfree(tsc);
75259966 TF	298	return error;
	299	}
	300
e2619cf7	301	static int tps6507x_ts_remove(struct platform_device *pdev)
75259966	302	{
5705b8ac DT	303	struct tps6507x_ts *tsc = platform_get_drvdata(pdev);
5705b8ac DT	304	struct input_polled_dev *poll_dev = tsc->poll_dev;
75259966	305
5705b8ac DT	306	input_unregister_polled_device(poll_dev);
5705b8ac DT	307	input_free_polled_device(poll_dev);
75259966	308
75259966 TF	309	kfree(tsc);
	310
	311	return 0;
	312	}
	313
	314	static struct platform_driver tps6507x_ts_driver = {
	315	.driver = {
	316	.name = "tps6507x-ts",
75259966 TF	317	},
75259966 TF	318	.probe = tps6507x_ts_probe,
1cb0aa88	319	.remove = tps6507x_ts_remove,
75259966	320	};
cdcc96e2	321	module_platform_driver(tps6507x_ts_driver);
75259966 TF	322
	323	MODULE_AUTHOR("Todd Fischer <todd.fischer@ridgerun.com>");
	324	MODULE_DESCRIPTION("TPS6507x - TouchScreen driver");
	325	MODULE_LICENSE("GPL v2");
79026ff2	326	MODULE_ALIAS("platform:tps6507x-ts");