1 // SPDX-License-Identifier: GPL-2.0
3 * ST1232 Touchscreen Controller Driver
5 * Copyright (C) 2010 Renesas Solutions Corp.
6 * Tony SIM <chinyeow.sim.xt@renesas.com>
9 * - android.git.kernel.org: projects/kernel/common.git: synaptics_i2c_rmi.c
10 * Copyright (C) 2007 Google, Inc.
13 #include <linux/delay.h>
14 #include <linux/gpio/consumer.h>
15 #include <linux/i2c.h>
16 #include <linux/input.h>
17 #include <linux/interrupt.h>
18 #include <linux/module.h>
20 #include <linux/pm_qos.h>
21 #include <linux/slab.h>
22 #include <linux/types.h>
23 #include <linux/input/touchscreen.h>
25 #define ST1232_TS_NAME "st1232-ts"
26 #define ST1633_TS_NAME "st1633-ts"
28 struct st1232_ts_finger {
44 struct st1232_ts_data {
45 struct i2c_client *client;
46 struct input_dev *input_dev;
47 struct touchscreen_properties prop;
48 struct dev_pm_qos_request low_latency_req;
49 struct gpio_desc *reset_gpio;
50 const struct st_chip_info *chip_info;
53 struct st1232_ts_finger fingers[];
56 static int st1232_ts_read_data(struct st1232_ts_data *ts)
58 struct st1232_ts_finger *finger = ts->fingers;
59 struct i2c_client *client = ts->client;
60 u8 start_reg = ts->chip_info->start_reg;
61 struct i2c_msg msg[] = {
64 .len = sizeof(start_reg),
69 .flags = I2C_M_RD | I2C_M_DMA_SAFE,
70 .len = ts->read_buf_len,
78 ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
79 if (ret != ARRAY_SIZE(msg))
80 return ret < 0 ? ret : -EIO;
82 for (i = 0; i < ts->chip_info->max_fingers; i++) {
83 buf = &ts->read_buf[i * 4];
84 finger[i].is_valid = buf[0] >> 7;
85 if (finger[i].is_valid) {
86 finger[i].x = ((buf[0] & 0x70) << 4) | buf[1];
87 finger[i].y = ((buf[0] & 0x07) << 8) | buf[2];
89 /* st1232 includes a z-axis / touch strength */
90 if (ts->chip_info->have_z)
91 finger[i].t = ts->read_buf[i + 6];
98 static irqreturn_t st1232_ts_irq_handler(int irq, void *dev_id)
100 struct st1232_ts_data *ts = dev_id;
101 struct st1232_ts_finger *finger = ts->fingers;
102 struct input_dev *input_dev = ts->input_dev;
106 ret = st1232_ts_read_data(ts);
110 /* multi touch protocol */
111 for (i = 0; i < ts->chip_info->max_fingers; i++) {
112 if (!finger[i].is_valid)
115 if (ts->chip_info->have_z)
116 input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR,
119 touchscreen_report_pos(input_dev, &ts->prop,
120 finger[i].x, finger[i].y, true);
121 input_mt_sync(input_dev);
125 /* SYN_MT_REPORT only if no contact */
127 input_mt_sync(input_dev);
128 if (ts->low_latency_req.dev) {
129 dev_pm_qos_remove_request(&ts->low_latency_req);
130 ts->low_latency_req.dev = NULL;
132 } else if (!ts->low_latency_req.dev) {
133 /* First contact, request 100 us latency. */
134 dev_pm_qos_add_ancestor_request(&ts->client->dev,
135 &ts->low_latency_req,
136 DEV_PM_QOS_RESUME_LATENCY, 100);
140 input_sync(input_dev);
146 static void st1232_ts_power(struct st1232_ts_data *ts, bool poweron)
149 gpiod_set_value_cansleep(ts->reset_gpio, !poweron);
152 static void st1232_ts_power_off(void *data)
154 st1232_ts_power(data, false);
157 static const struct st_chip_info st1232_chip_info = {
159 .max_x = 0x31f, /* 800 - 1 */
160 .max_y = 0x1df, /* 480 -1 */
166 static const struct st_chip_info st1633_chip_info = {
168 .max_x = 0x13f, /* 320 - 1 */
169 .max_y = 0x1df, /* 480 -1 */
175 static int st1232_ts_probe(struct i2c_client *client,
176 const struct i2c_device_id *id)
178 const struct st_chip_info *match;
179 struct st1232_ts_data *ts;
180 struct input_dev *input_dev;
183 match = device_get_match_data(&client->dev);
185 match = (const void *)id->driver_data;
187 dev_err(&client->dev, "unknown device model\n");
191 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
192 dev_err(&client->dev, "need I2C_FUNC_I2C\n");
197 dev_err(&client->dev, "no IRQ?\n");
201 ts = devm_kzalloc(&client->dev,
202 struct_size(ts, fingers, match->max_fingers),
207 ts->chip_info = match;
209 /* allocate a buffer according to the number of registers to read */
210 ts->read_buf_len = ts->chip_info->max_fingers * 4;
211 ts->read_buf = devm_kzalloc(&client->dev, ts->read_buf_len, GFP_KERNEL);
215 input_dev = devm_input_allocate_device(&client->dev);
220 ts->input_dev = input_dev;
222 ts->reset_gpio = devm_gpiod_get_optional(&client->dev, NULL,
224 if (IS_ERR(ts->reset_gpio)) {
225 error = PTR_ERR(ts->reset_gpio);
226 dev_err(&client->dev, "Unable to request GPIO pin: %d.\n",
231 st1232_ts_power(ts, true);
233 error = devm_add_action_or_reset(&client->dev, st1232_ts_power_off, ts);
235 dev_err(&client->dev,
236 "Failed to install power off action: %d\n", error);
240 input_dev->name = "st1232-touchscreen";
241 input_dev->id.bustype = BUS_I2C;
243 __set_bit(INPUT_PROP_DIRECT, input_dev->propbit);
244 __set_bit(EV_SYN, input_dev->evbit);
245 __set_bit(EV_KEY, input_dev->evbit);
246 __set_bit(EV_ABS, input_dev->evbit);
248 if (ts->chip_info->have_z)
249 input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0,
250 ts->chip_info->max_area, 0, 0);
252 input_set_abs_params(input_dev, ABS_MT_POSITION_X,
253 0, ts->chip_info->max_x, 0, 0);
254 input_set_abs_params(input_dev, ABS_MT_POSITION_Y,
255 0, ts->chip_info->max_y, 0, 0);
257 touchscreen_parse_properties(input_dev, true, &ts->prop);
259 error = devm_request_threaded_irq(&client->dev, client->irq,
260 NULL, st1232_ts_irq_handler,
264 dev_err(&client->dev, "Failed to register interrupt\n");
268 error = input_register_device(ts->input_dev);
270 dev_err(&client->dev, "Unable to register %s input device\n",
275 i2c_set_clientdata(client, ts);
280 static int __maybe_unused st1232_ts_suspend(struct device *dev)
282 struct i2c_client *client = to_i2c_client(dev);
283 struct st1232_ts_data *ts = i2c_get_clientdata(client);
285 disable_irq(client->irq);
287 if (!device_may_wakeup(&client->dev))
288 st1232_ts_power(ts, false);
293 static int __maybe_unused st1232_ts_resume(struct device *dev)
295 struct i2c_client *client = to_i2c_client(dev);
296 struct st1232_ts_data *ts = i2c_get_clientdata(client);
298 if (!device_may_wakeup(&client->dev))
299 st1232_ts_power(ts, true);
301 enable_irq(client->irq);
306 static SIMPLE_DEV_PM_OPS(st1232_ts_pm_ops,
307 st1232_ts_suspend, st1232_ts_resume);
309 static const struct i2c_device_id st1232_ts_id[] = {
310 { ST1232_TS_NAME, (unsigned long)&st1232_chip_info },
311 { ST1633_TS_NAME, (unsigned long)&st1633_chip_info },
314 MODULE_DEVICE_TABLE(i2c, st1232_ts_id);
316 static const struct of_device_id st1232_ts_dt_ids[] = {
317 { .compatible = "sitronix,st1232", .data = &st1232_chip_info },
318 { .compatible = "sitronix,st1633", .data = &st1633_chip_info },
321 MODULE_DEVICE_TABLE(of, st1232_ts_dt_ids);
323 static struct i2c_driver st1232_ts_driver = {
324 .probe = st1232_ts_probe,
325 .id_table = st1232_ts_id,
327 .name = ST1232_TS_NAME,
328 .of_match_table = st1232_ts_dt_ids,
329 .pm = &st1232_ts_pm_ops,
333 module_i2c_driver(st1232_ts_driver);
335 MODULE_AUTHOR("Tony SIM <chinyeow.sim.xt@renesas.com>");
336 MODULE_AUTHOR("Martin Kepplinger <martin.kepplinger@ginzinger.com>");
337 MODULE_DESCRIPTION("SITRONIX ST1232 Touchscreen Controller Driver");
338 MODULE_LICENSE("GPL v2");