[mirror_ubuntu-eoan-kernel.git] / drivers / input / touchscreen / zet6223.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) 2016, Jelle van der Waa <jelle@vdwaa.nl>
 */

#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/input/mt.h>
#include <linux/input/touchscreen.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/regulator/consumer.h>
#include <asm/unaligned.h>

#define ZET6223_MAX_FINGERS		16
#define ZET6223_MAX_PKT_SIZE		(3 + 4 * ZET6223_MAX_FINGERS)

#define ZET6223_CMD_INFO		0xB2
#define ZET6223_CMD_INFO_LENGTH		17
#define ZET6223_VALID_PACKET		0x3c

#define ZET6223_POWER_ON_DELAY_MSEC	30

struct zet6223_ts {
	struct i2c_client *client;
	struct input_dev *input;
	struct regulator *vcc;
	struct regulator *vio;
	struct touchscreen_properties prop;
	struct regulator_bulk_data supplies[2];
	u16 max_x;
	u16 max_y;
	u8 fingernum;
};

static int zet6223_start(struct input_dev *dev)
{
	struct zet6223_ts *ts = input_get_drvdata(dev);

	enable_irq(ts->client->irq);

	return 0;
}

static void zet6223_stop(struct input_dev *dev)
{
	struct zet6223_ts *ts = input_get_drvdata(dev);

	disable_irq(ts->client->irq);
}

static irqreturn_t zet6223_irq(int irq, void *dev_id)
{
	struct zet6223_ts *ts = dev_id;
	u16 finger_bits;

	/*
	 * First 3 bytes are an identifier, two bytes of finger data.
	 * X, Y data per finger is 4 bytes.
	 */
	u8 bufsize = 3 + 4 * ts->fingernum;
	u8 buf[ZET6223_MAX_PKT_SIZE];
	int i;
	int ret;
	int error;

	ret = i2c_master_recv(ts->client, buf, bufsize);
	if (ret != bufsize) {
		error = ret < 0 ? ret : -EIO;
		dev_err_ratelimited(&ts->client->dev,
				    "Error reading input data: %d\n", error);
		return IRQ_HANDLED;
	}

	if (buf[0] != ZET6223_VALID_PACKET)
		return IRQ_HANDLED;

	finger_bits = get_unaligned_be16(buf + 1);
	for (i = 0; i < ts->fingernum; i++) {
		if (!(finger_bits & BIT(15 - i)))
			continue;

		input_mt_slot(ts->input, i);
		input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, true);
		input_event(ts->input, EV_ABS, ABS_MT_POSITION_X,
				((buf[i + 3] >> 4) << 8) + buf[i + 4]);
		input_event(ts->input, EV_ABS, ABS_MT_POSITION_Y,
				((buf[i + 3] & 0xF) << 8) + buf[i + 5]);
	}

	input_mt_sync_frame(ts->input);
	input_sync(ts->input);

	return IRQ_HANDLED;
}

static void zet6223_power_off(void *_ts)
{
	struct zet6223_ts *ts = _ts;

	regulator_bulk_disable(ARRAY_SIZE(ts->supplies), ts->supplies);
}

static int zet6223_power_on(struct zet6223_ts *ts)
{
	struct device *dev = &ts->client->dev;
	int error;

	ts->supplies[0].supply = "vio";
	ts->supplies[1].supply = "vcc";

	error = devm_regulator_bulk_get(dev, ARRAY_SIZE(ts->supplies),
					ts->supplies);
	if (error)
		return error;

	error = regulator_bulk_enable(ARRAY_SIZE(ts->supplies), ts->supplies);
	if (error)
		return error;

	msleep(ZET6223_POWER_ON_DELAY_MSEC);

	error = devm_add_action_or_reset(dev, zet6223_power_off, ts);
	if (error) {
		dev_err(dev, "failed to install poweroff action: %d\n", error);
		return error;
	}

	return 0;
}

static int zet6223_query_device(struct zet6223_ts *ts)
{
	u8 buf[ZET6223_CMD_INFO_LENGTH];
	u8 cmd = ZET6223_CMD_INFO;
	int ret;
	int error;

	ret = i2c_master_send(ts->client, &cmd, sizeof(cmd));
	if (ret != sizeof(cmd)) {
		error = ret < 0 ? ret : -EIO;
		dev_err(&ts->client->dev,
			"touchpanel info cmd failed: %d\n", error);
		return error;
	}

	ret = i2c_master_recv(ts->client, buf, sizeof(buf));
	if (ret != sizeof(buf)) {
		error = ret < 0 ? ret : -EIO;
		dev_err(&ts->client->dev,
			"failed to retrieve touchpanel info: %d\n", error);
		return error;
	}

	ts->fingernum = buf[15] & 0x7F;
	if (ts->fingernum > ZET6223_MAX_FINGERS) {
		dev_warn(&ts->client->dev,
			 "touchpanel reports %d fingers, limiting to %d\n",
			 ts->fingernum, ZET6223_MAX_FINGERS);
		ts->fingernum = ZET6223_MAX_FINGERS;
	}

	ts->max_x = get_unaligned_le16(&buf[8]);
	ts->max_y = get_unaligned_le16(&buf[10]);

	return 0;
}

static int zet6223_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	struct device *dev = &client->dev;
	struct zet6223_ts *ts;
	struct input_dev *input;
	int error;

	if (!client->irq) {
		dev_err(dev, "no irq specified\n");
		return -EINVAL;
	}

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

	ts->client = client;

	error = zet6223_power_on(ts);
	if (error)
		return error;

	error = zet6223_query_device(ts);
	if (error)
		return error;

	ts->input = input = devm_input_allocate_device(dev);
	if (!input)
		return -ENOMEM;

	input_set_drvdata(input, ts);

	input->name = client->name;
	input->id.bustype = BUS_I2C;
	input->open = zet6223_start;
	input->close = zet6223_stop;

	input_set_abs_params(input, ABS_MT_POSITION_X, 0, ts->max_x, 0, 0);
	input_set_abs_params(input, ABS_MT_POSITION_Y, 0, ts->max_y, 0, 0);

	touchscreen_parse_properties(input, true, &ts->prop);

	error = input_mt_init_slots(input, ts->fingernum,
				    INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
	if (error)
		return error;

	error = devm_request_threaded_irq(dev, client->irq, NULL, zet6223_irq,
					  IRQF_ONESHOT, client->name, ts);
	if (error) {
		dev_err(dev, "failed to request irq %d: %d\n",
			client->irq, error);
		return error;
	}

	zet6223_stop(input);

	error = input_register_device(input);
	if (error)
		return error;

	return 0;
}

static const struct of_device_id zet6223_of_match[] = {
	{ .compatible = "zeitec,zet6223" },
	{ }
};
MODULE_DEVICE_TABLE(of, zet6223_of_match);

static const struct i2c_device_id zet6223_id[] = {
	{ "zet6223", 0},
	{ }
};
MODULE_DEVICE_TABLE(i2c, zet6223_id);

static struct i2c_driver zet6223_driver = {
	.driver = {
		.name = "zet6223",
		.of_match_table = zet6223_of_match,
	},
	.probe = zet6223_probe,
	.id_table = zet6223_id
};
module_i2c_driver(zet6223_driver);

MODULE_AUTHOR("Jelle van der Waa <jelle@vdwaa.nl>");
MODULE_DESCRIPTION("ZEITEC zet622x I2C touchscreen driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
c942fddf	1	// SPDX-License-Identifier: GPL-2.0-or-later
83f66a6f JW	2	/*
83f66a6f JW	3	* Copyright (C) 2016, Jelle van der Waa <jelle@vdwaa.nl>
83f66a6f JW	4	*/
	5
	6	#include <linux/delay.h>
	7	#include <linux/i2c.h>
	8	#include <linux/input.h>
	9	#include <linux/input/mt.h>
	10	#include <linux/input/touchscreen.h>
	11	#include <linux/interrupt.h>
	12	#include <linux/module.h>
	13	#include <linux/regulator/consumer.h>
	14	#include <asm/unaligned.h>
	15
	16	#define ZET6223_MAX_FINGERS 16
	17	#define ZET6223_MAX_PKT_SIZE (3 + 4 * ZET6223_MAX_FINGERS)
	18
	19	#define ZET6223_CMD_INFO 0xB2
	20	#define ZET6223_CMD_INFO_LENGTH 17
	21	#define ZET6223_VALID_PACKET 0x3c
	22
	23	#define ZET6223_POWER_ON_DELAY_MSEC 30
	24
	25	struct zet6223_ts {
	26	struct i2c_client *client;
	27	struct input_dev *input;
	28	struct regulator *vcc;
	29	struct regulator *vio;
	30	struct touchscreen_properties prop;
	31	struct regulator_bulk_data supplies[2];
	32	u16 max_x;
	33	u16 max_y;
	34	u8 fingernum;
	35	};
	36
	37	static int zet6223_start(struct input_dev *dev)
	38	{
	39	struct zet6223_ts *ts = input_get_drvdata(dev);
	40
	41	enable_irq(ts->client->irq);
	42
	43	return 0;
	44	}
	45
	46	static void zet6223_stop(struct input_dev *dev)
	47	{
	48	struct zet6223_ts *ts = input_get_drvdata(dev);
	49
	50	disable_irq(ts->client->irq);
	51	}
	52
	53	static irqreturn_t zet6223_irq(int irq, void *dev_id)
	54	{
	55	struct zet6223_ts *ts = dev_id;
	56	u16 finger_bits;
	57
	58	/*
	59	* First 3 bytes are an identifier, two bytes of finger data.
	60	* X, Y data per finger is 4 bytes.
	61	*/
	62	u8 bufsize = 3 + 4 * ts->fingernum;
	63	u8 buf[ZET6223_MAX_PKT_SIZE];
	64	int i;
	65	int ret;
	66	int error;
	67
68	ret = i2c_master_recv(ts->client, buf, bufsize);
69	if (ret != bufsize) {
70	error = ret < 0 ? ret : -EIO;
71	dev_err_ratelimited(&ts->client->dev,
72	"Error reading input data: %d\n", error);
73	return IRQ_HANDLED;
74	}
75
76	if (buf[0] != ZET6223_VALID_PACKET)
77	return IRQ_HANDLED;
78
79	finger_bits = get_unaligned_be16(buf + 1);
80	for (i = 0; i < ts->fingernum; i++) {
81	if (!(finger_bits & BIT(15 - i)))
82	continue;
83
84	input_mt_slot(ts->input, i);
85	input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, true);
86	input_event(ts->input, EV_ABS, ABS_MT_POSITION_X,
87	((buf[i + 3] >> 4) << 8) + buf[i + 4]);
88	input_event(ts->input, EV_ABS, ABS_MT_POSITION_Y,
89	((buf[i + 3] & 0xF) << 8) + buf[i + 5]);
90	}
91
92	input_mt_sync_frame(ts->input);
93	input_sync(ts->input);
94
95	return IRQ_HANDLED;
96	}
97
98	static void zet6223_power_off(void *_ts)
99	{
100	struct zet6223_ts *ts = _ts;
101
102	regulator_bulk_disable(ARRAY_SIZE(ts->supplies), ts->supplies);
103	}
104
105	static int zet6223_power_on(struct zet6223_ts *ts)
106	{
107	struct device *dev = &ts->client->dev;
108	int error;
109
110	ts->supplies[0].supply = "vio";
111	ts->supplies[1].supply = "vcc";
112
113	error = devm_regulator_bulk_get(dev, ARRAY_SIZE(ts->supplies),
114	ts->supplies);
115	if (error)
116	return error;
117
118	error = regulator_bulk_enable(ARRAY_SIZE(ts->supplies), ts->supplies);
119	if (error)
120	return error;
121
122	msleep(ZET6223_POWER_ON_DELAY_MSEC);
123
124	error = devm_add_action_or_reset(dev, zet6223_power_off, ts);
125	if (error) {
126	dev_err(dev, "failed to install poweroff action: %d\n", error);
127	return error;
128	}
129
130	return 0;
131	}
132
133	static int zet6223_query_device(struct zet6223_ts *ts)
134	{
135	u8 buf[ZET6223_CMD_INFO_LENGTH];
136	u8 cmd = ZET6223_CMD_INFO;
137	int ret;
138	int error;
139
140	ret = i2c_master_send(ts->client, &cmd, sizeof(cmd));
141	if (ret != sizeof(cmd)) {
142	error = ret < 0 ? ret : -EIO;
143	dev_err(&ts->client->dev,
144	"touchpanel info cmd failed: %d\n", error);
145	return error;
146	}
147
148	ret = i2c_master_recv(ts->client, buf, sizeof(buf));
149	if (ret != sizeof(buf)) {
150	error = ret < 0 ? ret : -EIO;
151	dev_err(&ts->client->dev,
152	"failed to retrieve touchpanel info: %d\n", error);
153	return error;
154	}
155
156	ts->fingernum = buf[15] & 0x7F;
157	if (ts->fingernum > ZET6223_MAX_FINGERS) {
158	dev_warn(&ts->client->dev,
159	"touchpanel reports %d fingers, limiting to %d\n",
160	ts->fingernum, ZET6223_MAX_FINGERS);
161	ts->fingernum = ZET6223_MAX_FINGERS;
162	}
163
164	ts->max_x = get_unaligned_le16(&buf[8]);
165	ts->max_y = get_unaligned_le16(&buf[10]);
166
167	return 0;
168	}
169
170	static int zet6223_probe(struct i2c_client *client,
171	const struct i2c_device_id *id)
172	{
173	struct device *dev = &client->dev;
174	struct zet6223_ts *ts;
175	struct input_dev *input;
176	int error;
177
178	if (!client->irq) {
179	dev_err(dev, "no irq specified\n");
180	return -EINVAL;
181	}
182
183	ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL);
184	if (!ts)
185	return -ENOMEM;
186
187	ts->client = client;
188
189	error = zet6223_power_on(ts);
190	if (error)
191	return error;
192
193	error = zet6223_query_device(ts);
194	if (error)
195	return error;
196
197	ts->input = input = devm_input_allocate_device(dev);
198	if (!input)
199	return -ENOMEM;
200
201	input_set_drvdata(input, ts);
202
203	input->name = client->name;
204	input->id.bustype = BUS_I2C;
205	input->open = zet6223_start;
206	input->close = zet6223_stop;
207
208	input_set_abs_params(input, ABS_MT_POSITION_X, 0, ts->max_x, 0, 0);
209	input_set_abs_params(input, ABS_MT_POSITION_Y, 0, ts->max_y, 0, 0);
210
211	touchscreen_parse_properties(input, true, &ts->prop);
212
213	error = input_mt_init_slots(input, ts->fingernum,
214	INPUT_MT_DIRECT \| INPUT_MT_DROP_UNUSED);
215	if (error)
216	return error;
217
218	error = devm_request_threaded_irq(dev, client->irq, NULL, zet6223_irq,
219	IRQF_ONESHOT, client->name, ts);
220	if (error) {
221	dev_err(dev, "failed to request irq %d: %d\n",
222	client->irq, error);
223	return error;
224	}
225
226	zet6223_stop(input);
227
228	error = input_register_device(input);
229	if (error)
230	return error;
231
232	return 0;
233	}
234
235	static const struct of_device_id zet6223_of_match[] = {
236	{ .compatible = "zeitec,zet6223" },
237	{ }
238	};
a1b53592	239	MODULE_DEVICE_TABLE(of, zet6223_of_match);
83f66a6f JW	240
	241	static const struct i2c_device_id zet6223_id[] = {
	242	{ "zet6223", 0},
	243	{ }
	244	};
	245	MODULE_DEVICE_TABLE(i2c, zet6223_id);
	246
	247	static struct i2c_driver zet6223_driver = {
	248	.driver = {
	249	.name = "zet6223",
	250	.of_match_table = zet6223_of_match,
	251	},
	252	.probe = zet6223_probe,
	253	.id_table = zet6223_id
	254	};
	255	module_i2c_driver(zet6223_driver);
	256
	257	MODULE_AUTHOR("Jelle van der Waa <jelle@vdwaa.nl>");
	258	MODULE_DESCRIPTION("ZEITEC zet622x I2C touchscreen driver");
	259	MODULE_LICENSE("GPL");