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1/*
2 * ST1232 Touchscreen Controller Driver
3 *
4 * Copyright (C) 2010 Renesas Solutions Corp.
5 * Tony SIM <chinyeow.sim.xt@renesas.com>
6 *
7 * Using code from:
8 * - android.git.kernel.org: projects/kernel/common.git: synaptics_i2c_rmi.c
9 * Copyright (C) 2007 Google, Inc.
10 *
11 * This software is licensed under the terms of the GNU General Public
12 * License version 2, as published by the Free Software Foundation, and
13 * may be copied, distributed, and modified under those terms.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 */
20
21#include <linux/delay.h>
22#include <linux/gpio.h>
23#include <linux/i2c.h>
24#include <linux/input.h>
25#include <linux/interrupt.h>
26#include <linux/module.h>
27#include <linux/of.h>
28#include <linux/of_gpio.h>
29#include <linux/pm_qos.h>
30#include <linux/slab.h>
31#include <linux/types.h>
32#include <linux/platform_data/st1232_pdata.h>
33
34#define ST1232_TS_NAME "st1232-ts"
35
36#define MIN_X 0x00
37#define MIN_Y 0x00
38#define MAX_X 0x31f /* (800 - 1) */
39#define MAX_Y 0x1df /* (480 - 1) */
40#define MAX_AREA 0xff
41#define MAX_FINGERS 2
42
43struct st1232_ts_finger {
44 u16 x;
45 u16 y;
46 u8 t;
47 bool is_valid;
48};
49
50struct st1232_ts_data {
51 struct i2c_client *client;
52 struct input_dev *input_dev;
53 struct st1232_ts_finger finger[MAX_FINGERS];
54 struct dev_pm_qos_request low_latency_req;
55 int reset_gpio;
56};
57
58static int st1232_ts_read_data(struct st1232_ts_data *ts)
59{
60 struct st1232_ts_finger *finger = ts->finger;
61 struct i2c_client *client = ts->client;
62 struct i2c_msg msg[2];
63 int error;
64 u8 start_reg;
65 u8 buf[10];
66
67 /* read touchscreen data from ST1232 */
68 msg[0].addr = client->addr;
69 msg[0].flags = 0;
70 msg[0].len = 1;
71 msg[0].buf = &start_reg;
72 start_reg = 0x10;
73
74 msg[1].addr = ts->client->addr;
75 msg[1].flags = I2C_M_RD;
76 msg[1].len = sizeof(buf);
77 msg[1].buf = buf;
78
79 error = i2c_transfer(client->adapter, msg, 2);
80 if (error < 0)
81 return error;
82
83 /* get "valid" bits */
84 finger[0].is_valid = buf[2] >> 7;
85 finger[1].is_valid = buf[5] >> 7;
86
87 /* get xy coordinate */
88 if (finger[0].is_valid) {
89 finger[0].x = ((buf[2] & 0x0070) << 4) | buf[3];
90 finger[0].y = ((buf[2] & 0x0007) << 8) | buf[4];
91 finger[0].t = buf[8];
92 }
93
94 if (finger[1].is_valid) {
95 finger[1].x = ((buf[5] & 0x0070) << 4) | buf[6];
96 finger[1].y = ((buf[5] & 0x0007) << 8) | buf[7];
97 finger[1].t = buf[9];
98 }
99
100 return 0;
101}
102
103static irqreturn_t st1232_ts_irq_handler(int irq, void *dev_id)
104{
105 struct st1232_ts_data *ts = dev_id;
106 struct st1232_ts_finger *finger = ts->finger;
107 struct input_dev *input_dev = ts->input_dev;
108 int count = 0;
109 int i, ret;
110
111 ret = st1232_ts_read_data(ts);
112 if (ret < 0)
113 goto end;
114
115 /* multi touch protocol */
116 for (i = 0; i < MAX_FINGERS; i++) {
117 if (!finger[i].is_valid)
118 continue;
119
120 input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, finger[i].t);
121 input_report_abs(input_dev, ABS_MT_POSITION_X, finger[i].x);
122 input_report_abs(input_dev, ABS_MT_POSITION_Y, finger[i].y);
123 input_mt_sync(input_dev);
124 count++;
125 }
126
127 /* SYN_MT_REPORT only if no contact */
128 if (!count) {
129 input_mt_sync(input_dev);
130 if (ts->low_latency_req.dev) {
131 dev_pm_qos_remove_request(&ts->low_latency_req);
132 ts->low_latency_req.dev = NULL;
133 }
134 } else if (!ts->low_latency_req.dev) {
135 /* First contact, request 100 us latency. */
136 dev_pm_qos_add_ancestor_request(&ts->client->dev,
137 &ts->low_latency_req,
138 DEV_PM_QOS_RESUME_LATENCY, 100);
139 }
140
141 /* SYN_REPORT */
142 input_sync(input_dev);
143
144end:
145 return IRQ_HANDLED;
146}
147
148static void st1232_ts_power(struct st1232_ts_data *ts, bool poweron)
149{
150 if (gpio_is_valid(ts->reset_gpio))
151 gpio_direction_output(ts->reset_gpio, poweron);
152}
153
154static int st1232_ts_probe(struct i2c_client *client,
155 const struct i2c_device_id *id)
156{
157 struct st1232_ts_data *ts;
158 struct st1232_pdata *pdata = dev_get_platdata(&client->dev);
159 struct input_dev *input_dev;
160 int error;
161
162 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
163 dev_err(&client->dev, "need I2C_FUNC_I2C\n");
164 return -EIO;
165 }
166
167 if (!client->irq) {
168 dev_err(&client->dev, "no IRQ?\n");
169 return -EINVAL;
170 }
171
172 ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
173 if (!ts)
174 return -ENOMEM;
175
176 input_dev = devm_input_allocate_device(&client->dev);
177 if (!input_dev)
178 return -ENOMEM;
179
180 ts->client = client;
181 ts->input_dev = input_dev;
182
183 if (pdata)
184 ts->reset_gpio = pdata->reset_gpio;
185 else if (client->dev.of_node)
186 ts->reset_gpio = of_get_gpio(client->dev.of_node, 0);
187 else
188 ts->reset_gpio = -ENODEV;
189
190 if (gpio_is_valid(ts->reset_gpio)) {
191 error = devm_gpio_request(&client->dev, ts->reset_gpio, NULL);
192 if (error) {
193 dev_err(&client->dev,
194 "Unable to request GPIO pin %d.\n",
195 ts->reset_gpio);
196 return error;
197 }
198 }
199
200 st1232_ts_power(ts, true);
201
202 input_dev->name = "st1232-touchscreen";
203 input_dev->id.bustype = BUS_I2C;
204 input_dev->dev.parent = &client->dev;
205
206 __set_bit(EV_SYN, input_dev->evbit);
207 __set_bit(EV_KEY, input_dev->evbit);
208 __set_bit(EV_ABS, input_dev->evbit);
209
210 input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0, MAX_AREA, 0, 0);
211 input_set_abs_params(input_dev, ABS_MT_POSITION_X, MIN_X, MAX_X, 0, 0);
212 input_set_abs_params(input_dev, ABS_MT_POSITION_Y, MIN_Y, MAX_Y, 0, 0);
213
214 error = devm_request_threaded_irq(&client->dev, client->irq,
215 NULL, st1232_ts_irq_handler,
216 IRQF_ONESHOT,
217 client->name, ts);
218 if (error) {
219 dev_err(&client->dev, "Failed to register interrupt\n");
220 return error;
221 }
222
223 error = input_register_device(ts->input_dev);
224 if (error) {
225 dev_err(&client->dev, "Unable to register %s input device\n",
226 input_dev->name);
227 return error;
228 }
229
230 i2c_set_clientdata(client, ts);
231 device_init_wakeup(&client->dev, 1);
232
233 return 0;
234}
235
236static int st1232_ts_remove(struct i2c_client *client)
237{
238 struct st1232_ts_data *ts = i2c_get_clientdata(client);
239
240 device_init_wakeup(&client->dev, 0);
241 st1232_ts_power(ts, false);
242
243 return 0;
244}
245
246static int __maybe_unused st1232_ts_suspend(struct device *dev)
247{
248 struct i2c_client *client = to_i2c_client(dev);
249 struct st1232_ts_data *ts = i2c_get_clientdata(client);
250
251 if (device_may_wakeup(&client->dev)) {
252 enable_irq_wake(client->irq);
253 } else {
254 disable_irq(client->irq);
255 st1232_ts_power(ts, false);
256 }
257
258 return 0;
259}
260
261static int __maybe_unused st1232_ts_resume(struct device *dev)
262{
263 struct i2c_client *client = to_i2c_client(dev);
264 struct st1232_ts_data *ts = i2c_get_clientdata(client);
265
266 if (device_may_wakeup(&client->dev)) {
267 disable_irq_wake(client->irq);
268 } else {
269 st1232_ts_power(ts, true);
270 enable_irq(client->irq);
271 }
272
273 return 0;
274}
275
276static SIMPLE_DEV_PM_OPS(st1232_ts_pm_ops,
277 st1232_ts_suspend, st1232_ts_resume);
278
279static const struct i2c_device_id st1232_ts_id[] = {
280 { ST1232_TS_NAME, 0 },
281 { }
282};
283MODULE_DEVICE_TABLE(i2c, st1232_ts_id);
284
285#ifdef CONFIG_OF
286static const struct of_device_id st1232_ts_dt_ids[] = {
287 { .compatible = "sitronix,st1232", },
288 { }
289};
290MODULE_DEVICE_TABLE(of, st1232_ts_dt_ids);
291#endif
292
293static struct i2c_driver st1232_ts_driver = {
294 .probe = st1232_ts_probe,
295 .remove = st1232_ts_remove,
296 .id_table = st1232_ts_id,
297 .driver = {
298 .name = ST1232_TS_NAME,
299 .of_match_table = of_match_ptr(st1232_ts_dt_ids),
300 .pm = &st1232_ts_pm_ops,
301 },
302};
303
304module_i2c_driver(st1232_ts_driver);
305
306MODULE_AUTHOR("Tony SIM <chinyeow.sim.xt@renesas.com>");
307MODULE_DESCRIPTION("SITRONIX ST1232 Touchscreen Controller Driver");
308MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * ST1232 Touchscreen Controller Driver
4 *
5 * Copyright (C) 2010 Renesas Solutions Corp.
6 * Tony SIM <chinyeow.sim.xt@renesas.com>
7 *
8 * Using code from:
9 * - android.git.kernel.org: projects/kernel/common.git: synaptics_i2c_rmi.c
10 * Copyright (C) 2007 Google, Inc.
11 */
12
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>
19#include <linux/of.h>
20#include <linux/pm_qos.h>
21#include <linux/slab.h>
22#include <linux/types.h>
23#include <linux/input/touchscreen.h>
24
25#define ST1232_TS_NAME "st1232-ts"
26#define ST1633_TS_NAME "st1633-ts"
27
28struct st1232_ts_finger {
29 u16 x;
30 u16 y;
31 u8 t;
32 bool is_valid;
33};
34
35struct st_chip_info {
36 bool have_z;
37 u16 max_x;
38 u16 max_y;
39 u16 max_area;
40 u16 max_fingers;
41 u8 start_reg;
42};
43
44struct 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;
51 int read_buf_len;
52 u8 *read_buf;
53 struct st1232_ts_finger *finger;
54};
55
56static int st1232_ts_read_data(struct st1232_ts_data *ts)
57{
58 struct st1232_ts_finger *finger = ts->finger;
59 struct i2c_client *client = ts->client;
60 struct i2c_msg msg[2];
61 int error;
62 int i, y;
63 u8 start_reg = ts->chip_info->start_reg;
64 u8 *buf = ts->read_buf;
65
66 /* read touchscreen data */
67 msg[0].addr = client->addr;
68 msg[0].flags = 0;
69 msg[0].len = 1;
70 msg[0].buf = &start_reg;
71
72 msg[1].addr = ts->client->addr;
73 msg[1].flags = I2C_M_RD;
74 msg[1].len = ts->read_buf_len;
75 msg[1].buf = buf;
76
77 error = i2c_transfer(client->adapter, msg, 2);
78 if (error < 0)
79 return error;
80
81 for (i = 0, y = 0; i < ts->chip_info->max_fingers; i++, y += 3) {
82 finger[i].is_valid = buf[i + y] >> 7;
83 if (finger[i].is_valid) {
84 finger[i].x = ((buf[i + y] & 0x0070) << 4) |
85 buf[i + y + 1];
86 finger[i].y = ((buf[i + y] & 0x0007) << 8) |
87 buf[i + y + 2];
88
89 /* st1232 includes a z-axis / touch strength */
90 if (ts->chip_info->have_z)
91 finger[i].t = buf[i + 6];
92 }
93 }
94
95 return 0;
96}
97
98static irqreturn_t st1232_ts_irq_handler(int irq, void *dev_id)
99{
100 struct st1232_ts_data *ts = dev_id;
101 struct st1232_ts_finger *finger = ts->finger;
102 struct input_dev *input_dev = ts->input_dev;
103 int count = 0;
104 int i, ret;
105
106 ret = st1232_ts_read_data(ts);
107 if (ret < 0)
108 goto end;
109
110 /* multi touch protocol */
111 for (i = 0; i < ts->chip_info->max_fingers; i++) {
112 if (!finger[i].is_valid)
113 continue;
114
115 if (ts->chip_info->have_z)
116 input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR,
117 finger[i].t);
118
119 touchscreen_report_pos(input_dev, &ts->prop,
120 finger[i].x, finger[i].y, true);
121 input_mt_sync(input_dev);
122 count++;
123 }
124
125 /* SYN_MT_REPORT only if no contact */
126 if (!count) {
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;
131 }
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);
137 }
138
139 /* SYN_REPORT */
140 input_sync(input_dev);
141
142end:
143 return IRQ_HANDLED;
144}
145
146static void st1232_ts_power(struct st1232_ts_data *ts, bool poweron)
147{
148 if (ts->reset_gpio)
149 gpiod_set_value_cansleep(ts->reset_gpio, !poweron);
150}
151
152static const struct st_chip_info st1232_chip_info = {
153 .have_z = true,
154 .max_x = 0x31f, /* 800 - 1 */
155 .max_y = 0x1df, /* 480 -1 */
156 .max_area = 0xff,
157 .max_fingers = 2,
158 .start_reg = 0x12,
159};
160
161static const struct st_chip_info st1633_chip_info = {
162 .have_z = false,
163 .max_x = 0x13f, /* 320 - 1 */
164 .max_y = 0x1df, /* 480 -1 */
165 .max_area = 0x00,
166 .max_fingers = 5,
167 .start_reg = 0x12,
168};
169
170static int st1232_ts_probe(struct i2c_client *client,
171 const struct i2c_device_id *id)
172{
173 const struct st_chip_info *match;
174 struct st1232_ts_data *ts;
175 struct st1232_ts_finger *finger;
176 struct input_dev *input_dev;
177 int error;
178
179 match = device_get_match_data(&client->dev);
180 if (!match && id)
181 match = (const void *)id->driver_data;
182 if (!match) {
183 dev_err(&client->dev, "unknown device model\n");
184 return -ENODEV;
185 }
186
187 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
188 dev_err(&client->dev, "need I2C_FUNC_I2C\n");
189 return -EIO;
190 }
191
192 if (!client->irq) {
193 dev_err(&client->dev, "no IRQ?\n");
194 return -EINVAL;
195 }
196
197 ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
198 if (!ts)
199 return -ENOMEM;
200
201 ts->chip_info = match;
202 ts->finger = devm_kcalloc(&client->dev,
203 ts->chip_info->max_fingers, sizeof(*finger),
204 GFP_KERNEL);
205 if (!ts->finger)
206 return -ENOMEM;
207
208 /* allocate a buffer according to the number of registers to read */
209 ts->read_buf_len = ts->chip_info->max_fingers * 4;
210 ts->read_buf = devm_kzalloc(&client->dev, ts->read_buf_len, GFP_KERNEL);
211 if (!ts->read_buf)
212 return -ENOMEM;
213
214 input_dev = devm_input_allocate_device(&client->dev);
215 if (!input_dev)
216 return -ENOMEM;
217
218 ts->client = client;
219 ts->input_dev = input_dev;
220
221 ts->reset_gpio = devm_gpiod_get_optional(&client->dev, NULL,
222 GPIOD_OUT_HIGH);
223 if (IS_ERR(ts->reset_gpio)) {
224 error = PTR_ERR(ts->reset_gpio);
225 dev_err(&client->dev, "Unable to request GPIO pin: %d.\n",
226 error);
227 return error;
228 }
229
230 st1232_ts_power(ts, true);
231
232 input_dev->name = "st1232-touchscreen";
233 input_dev->id.bustype = BUS_I2C;
234 input_dev->dev.parent = &client->dev;
235
236 __set_bit(INPUT_PROP_DIRECT, input_dev->propbit);
237 __set_bit(EV_SYN, input_dev->evbit);
238 __set_bit(EV_KEY, input_dev->evbit);
239 __set_bit(EV_ABS, input_dev->evbit);
240
241 if (ts->chip_info->have_z)
242 input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0,
243 ts->chip_info->max_area, 0, 0);
244
245 input_set_abs_params(input_dev, ABS_MT_POSITION_X,
246 0, ts->chip_info->max_x, 0, 0);
247 input_set_abs_params(input_dev, ABS_MT_POSITION_Y,
248 0, ts->chip_info->max_y, 0, 0);
249
250 touchscreen_parse_properties(input_dev, true, &ts->prop);
251
252 error = devm_request_threaded_irq(&client->dev, client->irq,
253 NULL, st1232_ts_irq_handler,
254 IRQF_ONESHOT,
255 client->name, ts);
256 if (error) {
257 dev_err(&client->dev, "Failed to register interrupt\n");
258 return error;
259 }
260
261 error = input_register_device(ts->input_dev);
262 if (error) {
263 dev_err(&client->dev, "Unable to register %s input device\n",
264 input_dev->name);
265 return error;
266 }
267
268 i2c_set_clientdata(client, ts);
269 device_init_wakeup(&client->dev, 1);
270
271 return 0;
272}
273
274static int st1232_ts_remove(struct i2c_client *client)
275{
276 struct st1232_ts_data *ts = i2c_get_clientdata(client);
277
278 st1232_ts_power(ts, false);
279
280 return 0;
281}
282
283static int __maybe_unused st1232_ts_suspend(struct device *dev)
284{
285 struct i2c_client *client = to_i2c_client(dev);
286 struct st1232_ts_data *ts = i2c_get_clientdata(client);
287
288 if (device_may_wakeup(&client->dev)) {
289 enable_irq_wake(client->irq);
290 } else {
291 disable_irq(client->irq);
292 st1232_ts_power(ts, false);
293 }
294
295 return 0;
296}
297
298static int __maybe_unused st1232_ts_resume(struct device *dev)
299{
300 struct i2c_client *client = to_i2c_client(dev);
301 struct st1232_ts_data *ts = i2c_get_clientdata(client);
302
303 if (device_may_wakeup(&client->dev)) {
304 disable_irq_wake(client->irq);
305 } else {
306 st1232_ts_power(ts, true);
307 enable_irq(client->irq);
308 }
309
310 return 0;
311}
312
313static SIMPLE_DEV_PM_OPS(st1232_ts_pm_ops,
314 st1232_ts_suspend, st1232_ts_resume);
315
316static const struct i2c_device_id st1232_ts_id[] = {
317 { ST1232_TS_NAME, (unsigned long)&st1232_chip_info },
318 { ST1633_TS_NAME, (unsigned long)&st1633_chip_info },
319 { }
320};
321MODULE_DEVICE_TABLE(i2c, st1232_ts_id);
322
323static const struct of_device_id st1232_ts_dt_ids[] = {
324 { .compatible = "sitronix,st1232", .data = &st1232_chip_info },
325 { .compatible = "sitronix,st1633", .data = &st1633_chip_info },
326 { }
327};
328MODULE_DEVICE_TABLE(of, st1232_ts_dt_ids);
329
330static struct i2c_driver st1232_ts_driver = {
331 .probe = st1232_ts_probe,
332 .remove = st1232_ts_remove,
333 .id_table = st1232_ts_id,
334 .driver = {
335 .name = ST1232_TS_NAME,
336 .of_match_table = st1232_ts_dt_ids,
337 .pm = &st1232_ts_pm_ops,
338 },
339};
340
341module_i2c_driver(st1232_ts_driver);
342
343MODULE_AUTHOR("Tony SIM <chinyeow.sim.xt@renesas.com>");
344MODULE_AUTHOR("Martin Kepplinger <martin.kepplinger@ginzinger.com>");
345MODULE_DESCRIPTION("SITRONIX ST1232 Touchscreen Controller Driver");
346MODULE_LICENSE("GPL v2");