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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/i2c.h>
23#include <linux/input.h>
24#include <linux/interrupt.h>
25#include <linux/module.h>
26#include <linux/slab.h>
27#include <linux/types.h>
28
29#define ST1232_TS_NAME "st1232-ts"
30
31#define MIN_X 0x00
32#define MIN_Y 0x00
33#define MAX_X 0x31f /* (800 - 1) */
34#define MAX_Y 0x1df /* (480 - 1) */
35#define MAX_AREA 0xff
36#define MAX_FINGERS 2
37
38struct st1232_ts_finger {
39 u16 x;
40 u16 y;
41 u8 t;
42 bool is_valid;
43};
44
45struct st1232_ts_data {
46 struct i2c_client *client;
47 struct input_dev *input_dev;
48 struct st1232_ts_finger finger[MAX_FINGERS];
49};
50
51static int st1232_ts_read_data(struct st1232_ts_data *ts)
52{
53 struct st1232_ts_finger *finger = ts->finger;
54 struct i2c_client *client = ts->client;
55 struct i2c_msg msg[2];
56 int error;
57 u8 start_reg;
58 u8 buf[10];
59
60 /* read touchscreen data from ST1232 */
61 msg[0].addr = client->addr;
62 msg[0].flags = 0;
63 msg[0].len = 1;
64 msg[0].buf = &start_reg;
65 start_reg = 0x10;
66
67 msg[1].addr = ts->client->addr;
68 msg[1].flags = I2C_M_RD;
69 msg[1].len = sizeof(buf);
70 msg[1].buf = buf;
71
72 error = i2c_transfer(client->adapter, msg, 2);
73 if (error < 0)
74 return error;
75
76 /* get "valid" bits */
77 finger[0].is_valid = buf[2] >> 7;
78 finger[1].is_valid = buf[5] >> 7;
79
80 /* get xy coordinate */
81 if (finger[0].is_valid) {
82 finger[0].x = ((buf[2] & 0x0070) << 4) | buf[3];
83 finger[0].y = ((buf[2] & 0x0007) << 8) | buf[4];
84 finger[0].t = buf[8];
85 }
86
87 if (finger[1].is_valid) {
88 finger[1].x = ((buf[5] & 0x0070) << 4) | buf[6];
89 finger[1].y = ((buf[5] & 0x0007) << 8) | buf[7];
90 finger[1].t = buf[9];
91 }
92
93 return 0;
94}
95
96static irqreturn_t st1232_ts_irq_handler(int irq, void *dev_id)
97{
98 struct st1232_ts_data *ts = dev_id;
99 struct st1232_ts_finger *finger = ts->finger;
100 struct input_dev *input_dev = ts->input_dev;
101 int count = 0;
102 int i, ret;
103
104 ret = st1232_ts_read_data(ts);
105 if (ret < 0)
106 goto end;
107
108 /* multi touch protocol */
109 for (i = 0; i < MAX_FINGERS; i++) {
110 if (!finger[i].is_valid)
111 continue;
112
113 input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, finger[i].t);
114 input_report_abs(input_dev, ABS_MT_POSITION_X, finger[i].x);
115 input_report_abs(input_dev, ABS_MT_POSITION_Y, finger[i].y);
116 input_mt_sync(input_dev);
117 count++;
118 }
119
120 /* SYN_MT_REPORT only if no contact */
121 if (!count)
122 input_mt_sync(input_dev);
123
124 /* SYN_REPORT */
125 input_sync(input_dev);
126
127end:
128 return IRQ_HANDLED;
129}
130
131static int __devinit st1232_ts_probe(struct i2c_client *client,
132 const struct i2c_device_id *id)
133{
134 struct st1232_ts_data *ts;
135 struct input_dev *input_dev;
136 int error;
137
138 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
139 dev_err(&client->dev, "need I2C_FUNC_I2C\n");
140 return -EIO;
141 }
142
143 if (!client->irq) {
144 dev_err(&client->dev, "no IRQ?\n");
145 return -EINVAL;
146 }
147
148
149 ts = kzalloc(sizeof(struct st1232_ts_data), GFP_KERNEL);
150 input_dev = input_allocate_device();
151 if (!ts || !input_dev) {
152 error = -ENOMEM;
153 goto err_free_mem;
154 }
155
156 ts->client = client;
157 ts->input_dev = input_dev;
158
159 input_dev->name = "st1232-touchscreen";
160 input_dev->id.bustype = BUS_I2C;
161 input_dev->dev.parent = &client->dev;
162
163 __set_bit(EV_SYN, input_dev->evbit);
164 __set_bit(EV_KEY, input_dev->evbit);
165 __set_bit(EV_ABS, input_dev->evbit);
166
167 input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0, MAX_AREA, 0, 0);
168 input_set_abs_params(input_dev, ABS_MT_POSITION_X, MIN_X, MAX_X, 0, 0);
169 input_set_abs_params(input_dev, ABS_MT_POSITION_Y, MIN_Y, MAX_Y, 0, 0);
170
171 error = request_threaded_irq(client->irq, NULL, st1232_ts_irq_handler,
172 IRQF_ONESHOT, client->name, ts);
173 if (error) {
174 dev_err(&client->dev, "Failed to register interrupt\n");
175 goto err_free_mem;
176 }
177
178 error = input_register_device(ts->input_dev);
179 if (error) {
180 dev_err(&client->dev, "Unable to register %s input device\n",
181 input_dev->name);
182 goto err_free_irq;
183 }
184
185 i2c_set_clientdata(client, ts);
186 device_init_wakeup(&client->dev, 1);
187
188 return 0;
189
190err_free_irq:
191 free_irq(client->irq, ts);
192err_free_mem:
193 input_free_device(input_dev);
194 kfree(ts);
195 return error;
196}
197
198static int __devexit st1232_ts_remove(struct i2c_client *client)
199{
200 struct st1232_ts_data *ts = i2c_get_clientdata(client);
201
202 device_init_wakeup(&client->dev, 0);
203 free_irq(client->irq, ts);
204 input_unregister_device(ts->input_dev);
205 kfree(ts);
206
207 return 0;
208}
209
210#ifdef CONFIG_PM
211static int st1232_ts_suspend(struct device *dev)
212{
213 struct i2c_client *client = to_i2c_client(dev);
214
215 if (device_may_wakeup(&client->dev))
216 enable_irq_wake(client->irq);
217 else
218 disable_irq(client->irq);
219
220 return 0;
221}
222
223static int st1232_ts_resume(struct device *dev)
224{
225 struct i2c_client *client = to_i2c_client(dev);
226
227 if (device_may_wakeup(&client->dev))
228 disable_irq_wake(client->irq);
229 else
230 enable_irq(client->irq);
231
232 return 0;
233}
234
235static const struct dev_pm_ops st1232_ts_pm_ops = {
236 .suspend = st1232_ts_suspend,
237 .resume = st1232_ts_resume,
238};
239#endif
240
241static const struct i2c_device_id st1232_ts_id[] = {
242 { ST1232_TS_NAME, 0 },
243 { }
244};
245MODULE_DEVICE_TABLE(i2c, st1232_ts_id);
246
247static struct i2c_driver st1232_ts_driver = {
248 .probe = st1232_ts_probe,
249 .remove = __devexit_p(st1232_ts_remove),
250 .id_table = st1232_ts_id,
251 .driver = {
252 .name = ST1232_TS_NAME,
253 .owner = THIS_MODULE,
254#ifdef CONFIG_PM
255 .pm = &st1232_ts_pm_ops,
256#endif
257 },
258};
259
260static int __init st1232_ts_init(void)
261{
262 return i2c_add_driver(&st1232_ts_driver);
263}
264module_init(st1232_ts_init);
265
266static void __exit st1232_ts_exit(void)
267{
268 i2c_del_driver(&st1232_ts_driver);
269}
270module_exit(st1232_ts_exit);
271
272MODULE_AUTHOR("Tony SIM <chinyeow.sim.xt@renesas.com>");
273MODULE_DESCRIPTION("SITRONIX ST1232 Touchscreen Controller Driver");
274MODULE_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/input/mt.h>
18#include <linux/input/touchscreen.h>
19#include <linux/interrupt.h>
20#include <linux/module.h>
21#include <linux/of.h>
22#include <linux/pm_qos.h>
23#include <linux/slab.h>
24#include <linux/types.h>
25
26#define ST1232_TS_NAME "st1232-ts"
27#define ST1633_TS_NAME "st1633-ts"
28
29#define ST_TS_MAX_FINGERS 10
30
31struct st_chip_info {
32 bool have_z;
33 u16 max_x;
34 u16 max_y;
35 u16 max_area;
36 u16 max_fingers;
37 u8 start_reg;
38};
39
40struct st1232_ts_data {
41 struct i2c_client *client;
42 struct input_dev *input_dev;
43 struct touchscreen_properties prop;
44 struct dev_pm_qos_request low_latency_req;
45 struct gpio_desc *reset_gpio;
46 const struct st_chip_info *chip_info;
47 int read_buf_len;
48 u8 *read_buf;
49};
50
51static int st1232_ts_read_data(struct st1232_ts_data *ts)
52{
53 struct i2c_client *client = ts->client;
54 u8 start_reg = ts->chip_info->start_reg;
55 struct i2c_msg msg[] = {
56 {
57 .addr = client->addr,
58 .len = sizeof(start_reg),
59 .buf = &start_reg,
60 },
61 {
62 .addr = client->addr,
63 .flags = I2C_M_RD | I2C_M_DMA_SAFE,
64 .len = ts->read_buf_len,
65 .buf = ts->read_buf,
66 }
67 };
68 int ret;
69
70 ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
71 if (ret != ARRAY_SIZE(msg))
72 return ret < 0 ? ret : -EIO;
73
74 return 0;
75}
76
77static int st1232_ts_parse_and_report(struct st1232_ts_data *ts)
78{
79 struct input_dev *input = ts->input_dev;
80 struct input_mt_pos pos[ST_TS_MAX_FINGERS];
81 u8 z[ST_TS_MAX_FINGERS];
82 int slots[ST_TS_MAX_FINGERS];
83 int n_contacts = 0;
84 int i;
85
86 for (i = 0; i < ts->chip_info->max_fingers; i++) {
87 u8 *buf = &ts->read_buf[i * 4];
88
89 if (buf[0] & BIT(7)) {
90 unsigned int x = ((buf[0] & 0x70) << 4) | buf[1];
91 unsigned int y = ((buf[0] & 0x07) << 8) | buf[2];
92
93 touchscreen_set_mt_pos(&pos[n_contacts],
94 &ts->prop, x, y);
95
96 /* st1232 includes a z-axis / touch strength */
97 if (ts->chip_info->have_z)
98 z[n_contacts] = ts->read_buf[i + 6];
99
100 n_contacts++;
101 }
102 }
103
104 input_mt_assign_slots(input, slots, pos, n_contacts, 0);
105 for (i = 0; i < n_contacts; i++) {
106 input_mt_slot(input, slots[i]);
107 input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
108 input_report_abs(input, ABS_MT_POSITION_X, pos[i].x);
109 input_report_abs(input, ABS_MT_POSITION_Y, pos[i].y);
110 if (ts->chip_info->have_z)
111 input_report_abs(input, ABS_MT_TOUCH_MAJOR, z[i]);
112 }
113
114 input_mt_sync_frame(input);
115 input_sync(input);
116
117 return n_contacts;
118}
119
120static irqreturn_t st1232_ts_irq_handler(int irq, void *dev_id)
121{
122 struct st1232_ts_data *ts = dev_id;
123 int count;
124 int error;
125
126 error = st1232_ts_read_data(ts);
127 if (error)
128 goto out;
129
130 count = st1232_ts_parse_and_report(ts);
131 if (!count) {
132 if (ts->low_latency_req.dev) {
133 dev_pm_qos_remove_request(&ts->low_latency_req);
134 ts->low_latency_req.dev = NULL;
135 }
136 } else if (!ts->low_latency_req.dev) {
137 /* First contact, request 100 us latency. */
138 dev_pm_qos_add_ancestor_request(&ts->client->dev,
139 &ts->low_latency_req,
140 DEV_PM_QOS_RESUME_LATENCY, 100);
141 }
142
143out:
144 return IRQ_HANDLED;
145}
146
147static void st1232_ts_power(struct st1232_ts_data *ts, bool poweron)
148{
149 if (ts->reset_gpio)
150 gpiod_set_value_cansleep(ts->reset_gpio, !poweron);
151}
152
153static void st1232_ts_power_off(void *data)
154{
155 st1232_ts_power(data, false);
156}
157
158static const struct st_chip_info st1232_chip_info = {
159 .have_z = true,
160 .max_x = 0x31f, /* 800 - 1 */
161 .max_y = 0x1df, /* 480 -1 */
162 .max_area = 0xff,
163 .max_fingers = 2,
164 .start_reg = 0x12,
165};
166
167static const struct st_chip_info st1633_chip_info = {
168 .have_z = false,
169 .max_x = 0x13f, /* 320 - 1 */
170 .max_y = 0x1df, /* 480 -1 */
171 .max_area = 0x00,
172 .max_fingers = 5,
173 .start_reg = 0x12,
174};
175
176static int st1232_ts_probe(struct i2c_client *client,
177 const struct i2c_device_id *id)
178{
179 const struct st_chip_info *match;
180 struct st1232_ts_data *ts;
181 struct input_dev *input_dev;
182 int error;
183
184 match = device_get_match_data(&client->dev);
185 if (!match && id)
186 match = (const void *)id->driver_data;
187 if (!match) {
188 dev_err(&client->dev, "unknown device model\n");
189 return -ENODEV;
190 }
191
192 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
193 dev_err(&client->dev, "need I2C_FUNC_I2C\n");
194 return -EIO;
195 }
196
197 if (!client->irq) {
198 dev_err(&client->dev, "no IRQ?\n");
199 return -EINVAL;
200 }
201
202 ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
203 if (!ts)
204 return -ENOMEM;
205
206 ts->chip_info = match;
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 error = devm_add_action_or_reset(&client->dev, st1232_ts_power_off, ts);
233 if (error) {
234 dev_err(&client->dev,
235 "Failed to install power off action: %d\n", error);
236 return error;
237 }
238
239 input_dev->name = "st1232-touchscreen";
240 input_dev->id.bustype = BUS_I2C;
241
242 if (ts->chip_info->have_z)
243 input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0,
244 ts->chip_info->max_area, 0, 0);
245
246 input_set_abs_params(input_dev, ABS_MT_POSITION_X,
247 0, ts->chip_info->max_x, 0, 0);
248 input_set_abs_params(input_dev, ABS_MT_POSITION_Y,
249 0, ts->chip_info->max_y, 0, 0);
250
251 touchscreen_parse_properties(input_dev, true, &ts->prop);
252
253 error = input_mt_init_slots(input_dev, ts->chip_info->max_fingers,
254 INPUT_MT_DIRECT | INPUT_MT_TRACK |
255 INPUT_MT_DROP_UNUSED);
256 if (error) {
257 dev_err(&client->dev, "failed to initialize MT slots\n");
258 return error;
259 }
260
261 error = devm_request_threaded_irq(&client->dev, client->irq,
262 NULL, st1232_ts_irq_handler,
263 IRQF_ONESHOT,
264 client->name, ts);
265 if (error) {
266 dev_err(&client->dev, "Failed to register interrupt\n");
267 return error;
268 }
269
270 error = input_register_device(ts->input_dev);
271 if (error) {
272 dev_err(&client->dev, "Unable to register %s input device\n",
273 input_dev->name);
274 return error;
275 }
276
277 i2c_set_clientdata(client, ts);
278
279 return 0;
280}
281
282static int __maybe_unused st1232_ts_suspend(struct device *dev)
283{
284 struct i2c_client *client = to_i2c_client(dev);
285 struct st1232_ts_data *ts = i2c_get_clientdata(client);
286
287 disable_irq(client->irq);
288
289 if (!device_may_wakeup(&client->dev))
290 st1232_ts_power(ts, false);
291
292 return 0;
293}
294
295static int __maybe_unused st1232_ts_resume(struct device *dev)
296{
297 struct i2c_client *client = to_i2c_client(dev);
298 struct st1232_ts_data *ts = i2c_get_clientdata(client);
299
300 if (!device_may_wakeup(&client->dev))
301 st1232_ts_power(ts, true);
302
303 enable_irq(client->irq);
304
305 return 0;
306}
307
308static SIMPLE_DEV_PM_OPS(st1232_ts_pm_ops,
309 st1232_ts_suspend, st1232_ts_resume);
310
311static const struct i2c_device_id st1232_ts_id[] = {
312 { ST1232_TS_NAME, (unsigned long)&st1232_chip_info },
313 { ST1633_TS_NAME, (unsigned long)&st1633_chip_info },
314 { }
315};
316MODULE_DEVICE_TABLE(i2c, st1232_ts_id);
317
318static const struct of_device_id st1232_ts_dt_ids[] = {
319 { .compatible = "sitronix,st1232", .data = &st1232_chip_info },
320 { .compatible = "sitronix,st1633", .data = &st1633_chip_info },
321 { }
322};
323MODULE_DEVICE_TABLE(of, st1232_ts_dt_ids);
324
325static struct i2c_driver st1232_ts_driver = {
326 .probe = st1232_ts_probe,
327 .id_table = st1232_ts_id,
328 .driver = {
329 .name = ST1232_TS_NAME,
330 .of_match_table = st1232_ts_dt_ids,
331 .pm = &st1232_ts_pm_ops,
332 },
333};
334
335module_i2c_driver(st1232_ts_driver);
336
337MODULE_AUTHOR("Tony SIM <chinyeow.sim.xt@renesas.com>");
338MODULE_AUTHOR("Martin Kepplinger <martin.kepplinger@ginzinger.com>");
339MODULE_DESCRIPTION("SITRONIX ST1232 Touchscreen Controller Driver");
340MODULE_LICENSE("GPL v2");