[thirdparty/linux.git] / drivers / input / touchscreen / migor_ts.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Touch Screen driver for Renesas MIGO-R Platform
 *
 * Copyright (c) 2008 Magnus Damm
 * Copyright (c) 2007 Ujjwal Pande <ujjwal@kenati.com>,
 *  Kenati Technologies Pvt Ltd.
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/pm.h>
#include <linux/slab.h>
#include <asm/io.h>
#include <linux/i2c.h>
#include <linux/timer.h>

#define EVENT_PENDOWN 1
#define EVENT_REPEAT  2
#define EVENT_PENUP   3

struct migor_ts_priv {
	struct i2c_client *client;
	struct input_dev *input;
	int irq;
};

static const u_int8_t migor_ts_ena_seq[17] = { 0x33, 0x22, 0x11,
					       0x01, 0x06, 0x07, };
static const u_int8_t migor_ts_dis_seq[17] = { };

static irqreturn_t migor_ts_isr(int irq, void *dev_id)
{
	struct migor_ts_priv *priv = dev_id;
	unsigned short xpos, ypos;
	unsigned char event;
	u_int8_t buf[16];

	/*
	 * The touch screen controller chip is hooked up to the CPU
	 * using I2C and a single interrupt line. The interrupt line
	 * is pulled low whenever someone taps the screen. To deassert
	 * the interrupt line we need to acknowledge the interrupt by
	 * communicating with the controller over the slow i2c bus.
	 *
	 * Since I2C bus controller may sleep we are using threaded
	 * IRQ here.
	 */

	memset(buf, 0, sizeof(buf));

	/* Set Index 0 */
	buf[0] = 0;
	if (i2c_master_send(priv->client, buf, 1) != 1) {
		dev_err(&priv->client->dev, "Unable to write i2c index\n");
		goto out;
	}

	/* Now do Page Read */
	if (i2c_master_recv(priv->client, buf, sizeof(buf)) != sizeof(buf)) {
		dev_err(&priv->client->dev, "Unable to read i2c page\n");
		goto out;
	}

	ypos = ((buf[9] & 0x03) << 8 | buf[8]);
	xpos = ((buf[11] & 0x03) << 8 | buf[10]);
	event = buf[12];

	switch (event) {
	case EVENT_PENDOWN:
	case EVENT_REPEAT:
		input_report_key(priv->input, BTN_TOUCH, 1);
		input_report_abs(priv->input, ABS_X, ypos); /*X-Y swap*/
		input_report_abs(priv->input, ABS_Y, xpos);
		input_sync(priv->input);
		break;

	case EVENT_PENUP:
		input_report_key(priv->input, BTN_TOUCH, 0);
		input_sync(priv->input);
		break;
	}

 out:
	return IRQ_HANDLED;
}

static int migor_ts_open(struct input_dev *dev)
{
	struct migor_ts_priv *priv = input_get_drvdata(dev);
	struct i2c_client *client = priv->client;
	int count;

	/* enable controller */
	count = i2c_master_send(client, migor_ts_ena_seq,
				sizeof(migor_ts_ena_seq));
	if (count != sizeof(migor_ts_ena_seq)) {
		dev_err(&client->dev, "Unable to enable touchscreen.\n");
		return -ENXIO;
	}

	return 0;
}

static void migor_ts_close(struct input_dev *dev)
{
	struct migor_ts_priv *priv = input_get_drvdata(dev);
	struct i2c_client *client = priv->client;

	disable_irq(priv->irq);

	/* disable controller */
	i2c_master_send(client, migor_ts_dis_seq, sizeof(migor_ts_dis_seq));

	enable_irq(priv->irq);
}

static int migor_ts_probe(struct i2c_client *client,
			  const struct i2c_device_id *idp)
{
	struct migor_ts_priv *priv;
	struct input_dev *input;
	int error;

	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	input = input_allocate_device();
	if (!priv || !input) {
		dev_err(&client->dev, "failed to allocate memory\n");
		error = -ENOMEM;
		goto err_free_mem;
	}

	priv->client = client;
	priv->input = input;
	priv->irq = client->irq;

	input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);

	__set_bit(BTN_TOUCH, input->keybit);

	input_set_abs_params(input, ABS_X, 95, 955, 0, 0);
	input_set_abs_params(input, ABS_Y, 85, 935, 0, 0);

	input->name = client->name;
	input->id.bustype = BUS_I2C;
	input->dev.parent = &client->dev;

	input->open = migor_ts_open;
	input->close = migor_ts_close;

	input_set_drvdata(input, priv);

	error = request_threaded_irq(priv->irq, NULL, migor_ts_isr,
                                     IRQF_TRIGGER_LOW | IRQF_ONESHOT,
                                     client->name, priv);
	if (error) {
		dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
		goto err_free_mem;
	}

	error = input_register_device(input);
	if (error)
		goto err_free_irq;

	i2c_set_clientdata(client, priv);
	device_init_wakeup(&client->dev, 1);

	return 0;

 err_free_irq:
	free_irq(priv->irq, priv);
 err_free_mem:
	input_free_device(input);
	kfree(priv);
	return error;
}

static int migor_ts_remove(struct i2c_client *client)
{
	struct migor_ts_priv *priv = i2c_get_clientdata(client);

	free_irq(priv->irq, priv);
	input_unregister_device(priv->input);
	kfree(priv);

	dev_set_drvdata(&client->dev, NULL);

	return 0;
}

static int __maybe_unused migor_ts_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct migor_ts_priv *priv = i2c_get_clientdata(client);

	if (device_may_wakeup(&client->dev))
		enable_irq_wake(priv->irq);

	return 0;
}

static int __maybe_unused migor_ts_resume(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct migor_ts_priv *priv = i2c_get_clientdata(client);

	if (device_may_wakeup(&client->dev))
		disable_irq_wake(priv->irq);

	return 0;
}

static SIMPLE_DEV_PM_OPS(migor_ts_pm, migor_ts_suspend, migor_ts_resume);

static const struct i2c_device_id migor_ts_id[] = {
	{ "migor_ts", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, migor_ts_id);

static struct i2c_driver migor_ts_driver = {
	.driver = {
		.name = "migor_ts",
		.pm = &migor_ts_pm,
	},
	.probe = migor_ts_probe,
	.remove = migor_ts_remove,
	.id_table = migor_ts_id,
};

module_i2c_driver(migor_ts_driver);

MODULE_DESCRIPTION("MigoR Touchscreen driver");
MODULE_AUTHOR("Magnus Damm <damm@opensource.se>");
MODULE_LICENSE("GPL");
Commit	Line	Data
dda2af74	1	// SPDX-License-Identifier: GPL-2.0+
885c316d MD	2	/*
	3	* Touch Screen driver for Renesas MIGO-R Platform
	4	*
	5	* Copyright (c) 2008 Magnus Damm
	6	* Copyright (c) 2007 Ujjwal Pande <ujjwal@kenati.com>,
	7	* Kenati Technologies Pvt Ltd.
885c316d MD	8	*/
	9	#include <linux/module.h>
	10	#include <linux/kernel.h>
	11	#include <linux/input.h>
	12	#include <linux/interrupt.h>
d72e64ec	13	#include <linux/pm.h>
5a0e3ad6	14	#include <linux/slab.h>
885c316d MD	15	#include <asm/io.h>
	16	#include <linux/i2c.h>
	17	#include <linux/timer.h>
	18
	19	#define EVENT_PENDOWN 1
	20	#define EVENT_REPEAT 2
	21	#define EVENT_PENUP 3
	22
	23	struct migor_ts_priv {
	24	struct i2c_client *client;
	25	struct input_dev *input;
885c316d MD	26	int irq;
	27	};
	28
	29	static const u_int8_t migor_ts_ena_seq[17] = { 0x33, 0x22, 0x11,
	30	0x01, 0x06, 0x07, };
	31	static const u_int8_t migor_ts_dis_seq[17] = { };
	32
468792eb	33	static irqreturn_t migor_ts_isr(int irq, void *dev_id)
885c316d	34	{
468792eb	35	struct migor_ts_priv *priv = dev_id;
885c316d MD	36	unsigned short xpos, ypos;
	37	unsigned char event;
	38	u_int8_t buf[16];
	39
468792eb DT	40	/*
	41	* The touch screen controller chip is hooked up to the CPU
	42	* using I2C and a single interrupt line. The interrupt line
	43	* is pulled low whenever someone taps the screen. To deassert
	44	* the interrupt line we need to acknowledge the interrupt by
	45	* communicating with the controller over the slow i2c bus.
	46	*
	47	* Since I2C bus controller may sleep we are using threaded
	48	* IRQ here.
	49	*/
	50
885c316d MD	51	memset(buf, 0, sizeof(buf));
	52
	53	/* Set Index 0 */
	54	buf[0] = 0;
	55	if (i2c_master_send(priv->client, buf, 1) != 1) {
	56	dev_err(&priv->client->dev, "Unable to write i2c index\n");
	57	goto out;
	58	}
	59
	60	/* Now do Page Read */
	61	if (i2c_master_recv(priv->client, buf, sizeof(buf)) != sizeof(buf)) {
	62	dev_err(&priv->client->dev, "Unable to read i2c page\n");
	63	goto out;
	64	}
	65
	66	ypos = ((buf[9] & 0x03) << 8 \| buf[8]);
	67	xpos = ((buf[11] & 0x03) << 8 \| buf[10]);
	68	event = buf[12];
	69
468792eb DT	70	switch (event) {
	71	case EVENT_PENDOWN:
	72	case EVENT_REPEAT:
885c316d MD	73	input_report_key(priv->input, BTN_TOUCH, 1);
	74	input_report_abs(priv->input, ABS_X, ypos); /X-Y swap/
	75	input_report_abs(priv->input, ABS_Y, xpos);
	76	input_sync(priv->input);
468792eb DT	77	break;
	78
	79	case EVENT_PENUP:
885c316d MD	80	input_report_key(priv->input, BTN_TOUCH, 0);
885c316d MD	81	input_sync(priv->input);
468792eb	82	break;
885c316d	83	}
885c316d	84
468792eb	85	out:
885c316d MD	86	return IRQ_HANDLED;
	87	}
	88
885c316d MD	89	static int migor_ts_open(struct input_dev *dev)
	90	{
	91	struct migor_ts_priv *priv = input_get_drvdata(dev);
	92	struct i2c_client *client = priv->client;
	93	int count;
	94
	95	/* enable controller */
	96	count = i2c_master_send(client, migor_ts_ena_seq,
	97	sizeof(migor_ts_ena_seq));
	98	if (count != sizeof(migor_ts_ena_seq)) {
	99	dev_err(&client->dev, "Unable to enable touchscreen.\n");
	100	return -ENXIO;
	101	}
	102
	103	return 0;
	104	}
	105
	106	static void migor_ts_close(struct input_dev *dev)
	107	{
	108	struct migor_ts_priv *priv = input_get_drvdata(dev);
	109	struct i2c_client *client = priv->client;
	110
	111	disable_irq(priv->irq);
	112
885c316d MD	113	/* disable controller */
	114	i2c_master_send(client, migor_ts_dis_seq, sizeof(migor_ts_dis_seq));
	115
	116	enable_irq(priv->irq);
	117	}
	118
	119	static int migor_ts_probe(struct i2c_client *client,
	120	const struct i2c_device_id *idp)
	121	{
	122	struct migor_ts_priv *priv;
	123	struct input_dev *input;
	124	int error;
	125
	126	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
885c316d	127	input = input_allocate_device();
ff4d0492 DT	128	if (!priv \|\| !input) {
ff4d0492 DT	129	dev_err(&client->dev, "failed to allocate memory\n");
885c316d	130	error = -ENOMEM;
ff4d0492	131	goto err_free_mem;
885c316d MD	132	}
885c316d MD	133
ff4d0492 DT	134	priv->client = client;
	135	priv->input = input;
	136	priv->irq = client->irq;
	137
885c316d	138	input->evbit[0] = BIT_MASK(EV_KEY) \| BIT_MASK(EV_ABS);
ff4d0492 DT	139
ff4d0492 DT	140	__set_bit(BTN_TOUCH, input->keybit);
885c316d MD	141
	142	input_set_abs_params(input, ABS_X, 95, 955, 0, 0);
	143	input_set_abs_params(input, ABS_Y, 85, 935, 0, 0);
	144
b6ce9ad0	145	input->name = client->name;
885c316d MD	146	input->id.bustype = BUS_I2C;
	147	input->dev.parent = &client->dev;
	148
	149	input->open = migor_ts_open;
	150	input->close = migor_ts_close;
	151
	152	input_set_drvdata(input, priv);
	153
468792eb DT	154	error = request_threaded_irq(priv->irq, NULL, migor_ts_isr,
	155	IRQF_TRIGGER_LOW \| IRQF_ONESHOT,
	156	client->name, priv);
885c316d MD	157	if (error) {
885c316d MD	158	dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
ff4d0492	159	goto err_free_mem;
885c316d MD	160	}
885c316d MD	161
ff4d0492 DT	162	error = input_register_device(input);
	163	if (error)
	164	goto err_free_irq;
	165
ec208612	166	i2c_set_clientdata(client, priv);
0935ade0	167	device_init_wakeup(&client->dev, 1);
ff4d0492	168
885c316d MD	169	return 0;
885c316d MD	170
ff4d0492 DT	171	err_free_irq:
	172	free_irq(priv->irq, priv);
	173	err_free_mem:
885c316d MD	174	input_free_device(input);
885c316d MD	175	kfree(priv);
885c316d MD	176	return error;
	177	}
	178
	179	static int migor_ts_remove(struct i2c_client *client)
	180	{
ec208612	181	struct migor_ts_priv *priv = i2c_get_clientdata(client);
885c316d MD	182
	183	free_irq(priv->irq, priv);
	184	input_unregister_device(priv->input);
	185	kfree(priv);
	186
	187	dev_set_drvdata(&client->dev, NULL);
	188
	189	return 0;
	190	}
	191
c32feb03	192	static int __maybe_unused migor_ts_suspend(struct device *dev)
0935ade0	193	{
d72e64ec	194	struct i2c_client *client = to_i2c_client(dev);
ec208612	195	struct migor_ts_priv *priv = i2c_get_clientdata(client);
0935ade0 MD	196
	197	if (device_may_wakeup(&client->dev))
	198	enable_irq_wake(priv->irq);
	199
	200	return 0;
	201	}
	202
c32feb03	203	static int __maybe_unused migor_ts_resume(struct device *dev)
0935ade0	204	{
d72e64ec	205	struct i2c_client *client = to_i2c_client(dev);
ec208612	206	struct migor_ts_priv *priv = i2c_get_clientdata(client);
0935ade0 MD	207
	208	if (device_may_wakeup(&client->dev))
	209	disable_irq_wake(priv->irq);
	210
	211	return 0;
	212	}
	213
d72e64ec MB	214	static SIMPLE_DEV_PM_OPS(migor_ts_pm, migor_ts_suspend, migor_ts_resume);
d72e64ec MB	215
b6ce9ad0 MD	216	static const struct i2c_device_id migor_ts_id[] = {
	217	{ "migor_ts", 0 },
	218	{ }
	219	};
8f4decc3	220	MODULE_DEVICE_TABLE(i2c, migor_ts_id);
b6ce9ad0	221
885c316d MD	222	static struct i2c_driver migor_ts_driver = {
	223	.driver = {
	224	.name = "migor_ts",
d72e64ec	225	.pm = &migor_ts_pm,
885c316d MD	226	},
	227	.probe = migor_ts_probe,
	228	.remove = migor_ts_remove,
b6ce9ad0	229	.id_table = migor_ts_id,
885c316d MD	230	};
885c316d MD	231
1b92c1cf	232	module_i2c_driver(migor_ts_driver);
885c316d MD	233
	234	MODULE_DESCRIPTION("MigoR Touchscreen driver");
	235	MODULE_AUTHOR("Magnus Damm <damm@opensource.se>");
	236	MODULE_LICENSE("GPL");