[mirror_ubuntu-zesty-kernel.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)
{
	return tsc->mfd->read_dev(tsc->mfd, reg, 1, data);
}

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	{
e5e66ed0	53	return tsc->mfd->read_dev(tsc->mfd, reg, 1, data);
75259966 TF	54	}
	55
	56	static int tps6507x_write_u8(struct tps6507x_ts *tsc, u8 reg, u8 data)
	57	{
	58	return tsc->mfd->write_dev(tsc->mfd, reg, 1, &data);
	59	}
	60
	61	static s32 tps6507x_adc_conversion(struct tps6507x_ts *tsc,
	62	u8 tsc_mode, u16 *value)
	63	{
	64	s32 ret;
	65	u8 adc_status;
	66	u8 result;
	67
	68	/* Route input signal to A/D converter */
	69
	70	ret = tps6507x_write_u8(tsc, TPS6507X_REG_TSCMODE, tsc_mode);
	71	if (ret) {
	72	dev_err(tsc->dev, "TSC mode read failed\n");
	73	goto err;
	74	}
	75
	76	/* Start A/D conversion */
	77
	78	ret = tps6507x_write_u8(tsc, TPS6507X_REG_ADCONFIG,
	79	TPS6507X_ADCONFIG_CONVERT_TS);
	80	if (ret) {
	81	dev_err(tsc->dev, "ADC config write failed\n");
	82	return ret;
	83	}
	84
	85	do {
	86	ret = tps6507x_read_u8(tsc, TPS6507X_REG_ADCONFIG,
	87	&adc_status);
	88	if (ret) {
	89	dev_err(tsc->dev, "ADC config read failed\n");
	90	goto err;
	91	}
	92	} while (adc_status & TPS6507X_ADCONFIG_START_CONVERSION);
	93
	94	ret = tps6507x_read_u8(tsc, TPS6507X_REG_ADRESULT_2, &result);
	95	if (ret) {
	96	dev_err(tsc->dev, "ADC result 2 read failed\n");
	97	goto err;
	98	}
	99
	100	*value = (result & TPS6507X_REG_ADRESULT_2_MASK) << 8;
	101
	102	ret = tps6507x_read_u8(tsc, TPS6507X_REG_ADRESULT_1, &result);
	103	if (ret) {
	104	dev_err(tsc->dev, "ADC result 1 read failed\n");
	105	goto err;
	106	}
	107
	108	*value \|= result;
	109
	110	dev_dbg(tsc->dev, "TSC channel %d = 0x%X\n", tsc_mode, *value);
	111
	112	err:
	113	return ret;
	114	}
	115
	116	/* Need to call tps6507x_adc_standby() after using A/D converter for the
	117	* touch screen interrupt to work properly.
118	*/
119
120	static s32 tps6507x_adc_standby(struct tps6507x_ts *tsc)
121	{
122	s32 ret;
123	s32 loops = 0;
124	u8 val;
125
126	ret = tps6507x_write_u8(tsc, TPS6507X_REG_ADCONFIG,
127	TPS6507X_ADCONFIG_INPUT_TSC);
128	if (ret)
129	return ret;
130
131	ret = tps6507x_write_u8(tsc, TPS6507X_REG_TSCMODE,
132	TPS6507X_TSCMODE_STANDBY);
133	if (ret)
134	return ret;
135
136	ret = tps6507x_read_u8(tsc, TPS6507X_REG_INT, &val);
137	if (ret)
138	return ret;
139
140	while (val & TPS6507X_REG_TSC_INT) {
141	mdelay(10);
142	ret = tps6507x_read_u8(tsc, TPS6507X_REG_INT, &val);
143	if (ret)
144	return ret;
145	loops++;
146	}
147
148	return ret;
149	}
150
5705b8ac	151	static void tps6507x_ts_poll(struct input_polled_dev *poll_dev)
75259966	152	{
5705b8ac DT	153	struct tps6507x_ts *tsc = poll_dev->private;
5705b8ac DT	154	struct input_dev *input_dev = poll_dev->input;
02a71600	155	bool pendown;
75259966 TF	156	s32 ret;
75259966 TF	157
02a71600 DT	158	ret = tps6507x_adc_conversion(tsc, TPS6507X_TSCMODE_PRESSURE,
02a71600 DT	159	&tsc->tc.pressure);
75259966 TF	160	if (ret)
	161	goto done;
	162
	163	pendown = tsc->tc.pressure > tsc->min_pressure;
	164
	165	if (unlikely(!pendown && tsc->pendown)) {
	166	dev_dbg(tsc->dev, "UP\n");
	167	input_report_key(input_dev, BTN_TOUCH, 0);
	168	input_report_abs(input_dev, ABS_PRESSURE, 0);
	169	input_sync(input_dev);
02a71600	170	tsc->pendown = false;
75259966 TF	171	}
	172
	173	if (pendown) {
	174
	175	if (!tsc->pendown) {
	176	dev_dbg(tsc->dev, "DOWN\n");
	177	input_report_key(input_dev, BTN_TOUCH, 1);
	178	} else
	179	dev_dbg(tsc->dev, "still down\n");
	180
	181	ret = tps6507x_adc_conversion(tsc, TPS6507X_TSCMODE_X_POSITION,
	182	&tsc->tc.x);
	183	if (ret)
	184	goto done;
	185
	186	ret = tps6507x_adc_conversion(tsc, TPS6507X_TSCMODE_Y_POSITION,
	187	&tsc->tc.y);
	188	if (ret)
	189	goto done;
	190
	191	input_report_abs(input_dev, ABS_X, tsc->tc.x);
	192	input_report_abs(input_dev, ABS_Y, tsc->tc.y);
	193	input_report_abs(input_dev, ABS_PRESSURE, tsc->tc.pressure);
	194	input_sync(input_dev);
02a71600	195	tsc->pendown = true;
75259966 TF	196	}
	197
	198	done:
5705b8ac	199	tps6507x_adc_standby(tsc);
75259966 TF	200	}
	201
	202	static int tps6507x_ts_probe(struct platform_device *pdev)
	203	{
75259966	204	struct tps6507x_dev *tps6507x_dev = dev_get_drvdata(pdev->dev.parent);
5705b8ac DT	205	const struct tps6507x_board *tps_board;
	206	const struct touchscreen_init_data *init_data;
	207	struct tps6507x_ts *tsc;
	208	struct input_polled_dev *poll_dev;
75259966	209	struct input_dev *input_dev;
5705b8ac	210	int error;
75259966	211
5705b8ac	212	/*
75259966 TF	213	* tps_board points to pmic related constants
	214	* coming from the board-evm file.
	215	*/
5705b8ac	216	tps_board = dev_get_platdata(tps6507x_dev->dev);
75259966 TF	217	if (!tps_board) {
	218	dev_err(tps6507x_dev->dev,
	219	"Could not find tps6507x platform data\n");
5705b8ac	220	return -ENODEV;
75259966 TF	221	}
75259966 TF	222
5705b8ac	223	/*
75259966 TF	224	* init_data points to array of regulator_init structures
	225	* coming from the board-evm file.
	226	*/
75259966 TF	227	init_data = tps_board->tps6507x_ts_init_data;
	228
	229	tsc = kzalloc(sizeof(struct tps6507x_ts), GFP_KERNEL);
	230	if (!tsc) {
	231	dev_err(tps6507x_dev->dev, "failed to allocate driver data\n");
5705b8ac	232	return -ENOMEM;
75259966 TF	233	}
75259966 TF	234
75259966 TF	235	tsc->mfd = tps6507x_dev;
75259966 TF	236	tsc->dev = tps6507x_dev->dev;
5705b8ac DT	237	tsc->min_pressure = init_data ?
	238	init_data->min_pressure : TPS_DEFAULT_MIN_PRESSURE;
	239
	240	snprintf(tsc->phys, sizeof(tsc->phys),
	241	"%s/input0", dev_name(tsc->dev));
	242
	243	poll_dev = input_allocate_polled_device();
	244	if (!poll_dev) {
	245	dev_err(tsc->dev, "Failed to allocate polled input device.\n");
75259966	246	error = -ENOMEM;
5705b8ac	247	goto err_free_mem;
75259966 TF	248	}
75259966 TF	249
5705b8ac DT	250	tsc->poll_dev = poll_dev;
	251
	252	poll_dev->private = tsc;
	253	poll_dev->poll = tps6507x_ts_poll;
	254	poll_dev->poll_interval = init_data ?
	255	init_data->poll_period : TSC_DEFAULT_POLL_PERIOD;
	256
	257	input_dev = poll_dev->input;
75259966 TF	258	input_dev->evbit[0] = BIT_MASK(EV_KEY) \| BIT_MASK(EV_ABS);
	259	input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
	260
	261	input_set_abs_params(input_dev, ABS_X, 0, MAX_10BIT, 0, 0);
	262	input_set_abs_params(input_dev, ABS_Y, 0, MAX_10BIT, 0, 0);
	263	input_set_abs_params(input_dev, ABS_PRESSURE, 0, MAX_10BIT, 0, 0);
	264
	265	input_dev->name = "TPS6507x Touchscreen";
75259966	266	input_dev->phys = tsc->phys;
5705b8ac DT	267	input_dev->dev.parent = tsc->dev;
5705b8ac DT	268	input_dev->id.bustype = BUS_I2C;
75259966	269	if (init_data) {
75259966 TF	270	input_dev->id.vendor = init_data->vendor;
	271	input_dev->id.product = init_data->product;
	272	input_dev->id.version = init_data->version;
75259966 TF	273	}
	274
	275	error = tps6507x_adc_standby(tsc);
	276	if (error)
5705b8ac	277	goto err_free_polled_dev;
75259966	278
5705b8ac	279	error = input_register_polled_device(poll_dev);
75259966	280	if (error)
5705b8ac	281	goto err_free_polled_dev;
75259966	282
5705b8ac	283	platform_set_drvdata(pdev, tsc);
75259966 TF	284
	285	return 0;
	286
5705b8ac DT	287	err_free_polled_dev:
	288	input_free_polled_device(poll_dev);
	289	err_free_mem:
75259966	290	kfree(tsc);
75259966 TF	291	return error;
	292	}
	293
e2619cf7	294	static int tps6507x_ts_remove(struct platform_device *pdev)
75259966	295	{
5705b8ac DT	296	struct tps6507x_ts *tsc = platform_get_drvdata(pdev);
5705b8ac DT	297	struct input_polled_dev *poll_dev = tsc->poll_dev;
75259966	298
5705b8ac DT	299	input_unregister_polled_device(poll_dev);
5705b8ac DT	300	input_free_polled_device(poll_dev);
75259966	301
75259966 TF	302	kfree(tsc);
	303
	304	return 0;
	305	}
	306
	307	static struct platform_driver tps6507x_ts_driver = {
	308	.driver = {
	309	.name = "tps6507x-ts",
75259966 TF	310	},
75259966 TF	311	.probe = tps6507x_ts_probe,
1cb0aa88	312	.remove = tps6507x_ts_remove,
75259966	313	};
cdcc96e2	314	module_platform_driver(tps6507x_ts_driver);
75259966 TF	315
	316	MODULE_AUTHOR("Todd Fischer <todd.fischer@ridgerun.com>");
	317	MODULE_DESCRIPTION("TPS6507x - TouchScreen driver");
	318	MODULE_LICENSE("GPL v2");
79026ff2	319	MODULE_ALIAS("platform:tps6507x-ts");