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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Driver for I2C connected EETI EXC3000 multiple touch controller
4 *
5 * Copyright (C) 2017 Ahmet Inan <inan@distec.de>
6 *
7 * minimal implementation based on egalax_ts.c and egalax_i2c.c
8 */
9
10#include <linux/bitops.h>
11#include <linux/delay.h>
12#include <linux/device.h>
13#include <linux/gpio/consumer.h>
14#include <linux/i2c.h>
15#include <linux/input.h>
16#include <linux/input/mt.h>
17#include <linux/input/touchscreen.h>
18#include <linux/interrupt.h>
19#include <linux/module.h>
20#include <linux/of.h>
21#include <linux/sizes.h>
22#include <linux/timer.h>
23#include <asm/unaligned.h>
24
25#define EXC3000_NUM_SLOTS 10
26#define EXC3000_SLOTS_PER_FRAME 5
27#define EXC3000_LEN_FRAME 66
28#define EXC3000_LEN_VENDOR_REQUEST 68
29#define EXC3000_LEN_POINT 10
30
31#define EXC3000_LEN_MODEL_NAME 16
32#define EXC3000_LEN_FW_VERSION 16
33
34#define EXC3000_VENDOR_EVENT 0x03
35#define EXC3000_MT1_EVENT 0x06
36#define EXC3000_MT2_EVENT 0x18
37
38#define EXC3000_TIMEOUT_MS 100
39
40#define EXC3000_RESET_MS 10
41#define EXC3000_READY_MS 100
42
43static const struct i2c_device_id exc3000_id[];
44
45struct eeti_dev_info {
46 const char *name;
47 int max_xy;
48};
49
50enum eeti_dev_id {
51 EETI_EXC3000,
52 EETI_EXC80H60,
53 EETI_EXC80H84,
54};
55
56static struct eeti_dev_info exc3000_info[] = {
57 [EETI_EXC3000] = {
58 .name = "EETI EXC3000 Touch Screen",
59 .max_xy = SZ_4K - 1,
60 },
61 [EETI_EXC80H60] = {
62 .name = "EETI EXC80H60 Touch Screen",
63 .max_xy = SZ_16K - 1,
64 },
65 [EETI_EXC80H84] = {
66 .name = "EETI EXC80H84 Touch Screen",
67 .max_xy = SZ_16K - 1,
68 },
69};
70
71struct exc3000_data {
72 struct i2c_client *client;
73 const struct eeti_dev_info *info;
74 struct input_dev *input;
75 struct touchscreen_properties prop;
76 struct gpio_desc *reset;
77 struct timer_list timer;
78 u8 buf[2 * EXC3000_LEN_FRAME];
79 struct completion wait_event;
80 struct mutex query_lock;
81};
82
83static void exc3000_report_slots(struct input_dev *input,
84 struct touchscreen_properties *prop,
85 const u8 *buf, int num)
86{
87 for (; num--; buf += EXC3000_LEN_POINT) {
88 if (buf[0] & BIT(0)) {
89 input_mt_slot(input, buf[1]);
90 input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
91 touchscreen_report_pos(input, prop,
92 get_unaligned_le16(buf + 2),
93 get_unaligned_le16(buf + 4),
94 true);
95 }
96 }
97}
98
99static void exc3000_timer(struct timer_list *t)
100{
101 struct exc3000_data *data = from_timer(data, t, timer);
102
103 input_mt_sync_frame(data->input);
104 input_sync(data->input);
105}
106
107static inline void exc3000_schedule_timer(struct exc3000_data *data)
108{
109 mod_timer(&data->timer, jiffies + msecs_to_jiffies(EXC3000_TIMEOUT_MS));
110}
111
112static int exc3000_read_frame(struct exc3000_data *data, u8 *buf)
113{
114 struct i2c_client *client = data->client;
115 int ret;
116
117 ret = i2c_master_send(client, "'", 2);
118 if (ret < 0)
119 return ret;
120
121 if (ret != 2)
122 return -EIO;
123
124 ret = i2c_master_recv(client, buf, EXC3000_LEN_FRAME);
125 if (ret < 0)
126 return ret;
127
128 if (ret != EXC3000_LEN_FRAME)
129 return -EIO;
130
131 if (get_unaligned_le16(buf) != EXC3000_LEN_FRAME)
132 return -EINVAL;
133
134 return 0;
135}
136
137static int exc3000_handle_mt_event(struct exc3000_data *data)
138{
139 struct input_dev *input = data->input;
140 int ret, total_slots;
141 u8 *buf = data->buf;
142
143 total_slots = buf[3];
144 if (!total_slots || total_slots > EXC3000_NUM_SLOTS) {
145 ret = -EINVAL;
146 goto out_fail;
147 }
148
149 if (total_slots > EXC3000_SLOTS_PER_FRAME) {
150 /* Read 2nd frame to get the rest of the contacts. */
151 ret = exc3000_read_frame(data, buf + EXC3000_LEN_FRAME);
152 if (ret)
153 goto out_fail;
154
155 /* 2nd chunk must have number of contacts set to 0. */
156 if (buf[EXC3000_LEN_FRAME + 3] != 0) {
157 ret = -EINVAL;
158 goto out_fail;
159 }
160 }
161
162 /*
163 * We read full state successfully, no contacts will be "stuck".
164 */
165 del_timer_sync(&data->timer);
166
167 while (total_slots > 0) {
168 int slots = min(total_slots, EXC3000_SLOTS_PER_FRAME);
169
170 exc3000_report_slots(input, &data->prop, buf + 4, slots);
171 total_slots -= slots;
172 buf += EXC3000_LEN_FRAME;
173 }
174
175 input_mt_sync_frame(input);
176 input_sync(input);
177
178 return 0;
179
180out_fail:
181 /* Schedule a timer to release "stuck" contacts */
182 exc3000_schedule_timer(data);
183
184 return ret;
185}
186
187static irqreturn_t exc3000_interrupt(int irq, void *dev_id)
188{
189 struct exc3000_data *data = dev_id;
190 u8 *buf = data->buf;
191 int ret;
192
193 ret = exc3000_read_frame(data, buf);
194 if (ret) {
195 /* Schedule a timer to release "stuck" contacts */
196 exc3000_schedule_timer(data);
197 goto out;
198 }
199
200 switch (buf[2]) {
201 case EXC3000_VENDOR_EVENT:
202 complete(&data->wait_event);
203 break;
204
205 case EXC3000_MT1_EVENT:
206 case EXC3000_MT2_EVENT:
207 exc3000_handle_mt_event(data);
208 break;
209
210 default:
211 break;
212 }
213
214out:
215 return IRQ_HANDLED;
216}
217
218static int exc3000_vendor_data_request(struct exc3000_data *data, u8 *request,
219 u8 request_len, u8 *response, int timeout)
220{
221 u8 buf[EXC3000_LEN_VENDOR_REQUEST] = { 0x67, 0x00, 0x42, 0x00, 0x03 };
222 int ret;
223 unsigned long time_left;
224
225 mutex_lock(&data->query_lock);
226
227 reinit_completion(&data->wait_event);
228
229 buf[5] = request_len;
230 memcpy(&buf[6], request, request_len);
231
232 ret = i2c_master_send(data->client, buf, EXC3000_LEN_VENDOR_REQUEST);
233 if (ret < 0)
234 goto out_unlock;
235
236 if (response) {
237 time_left = wait_for_completion_timeout(&data->wait_event,
238 timeout * HZ);
239 if (time_left == 0) {
240 ret = -ETIMEDOUT;
241 goto out_unlock;
242 }
243
244 if (data->buf[3] >= EXC3000_LEN_FRAME) {
245 ret = -ENOSPC;
246 goto out_unlock;
247 }
248
249 memcpy(response, &data->buf[4], data->buf[3]);
250 ret = data->buf[3];
251 }
252
253out_unlock:
254 mutex_unlock(&data->query_lock);
255
256 return ret;
257}
258
259static ssize_t fw_version_show(struct device *dev,
260 struct device_attribute *attr, char *buf)
261{
262 struct i2c_client *client = to_i2c_client(dev);
263 struct exc3000_data *data = i2c_get_clientdata(client);
264 u8 response[EXC3000_LEN_FRAME];
265 int ret;
266
267 /* query bootloader info */
268 ret = exc3000_vendor_data_request(data,
269 (u8[]){0x39, 0x02}, 2, response, 1);
270 if (ret < 0)
271 return ret;
272
273 /*
274 * If the bootloader version is non-zero then the device is in
275 * bootloader mode and won't answer a query for the application FW
276 * version, so we just use the bootloader version info.
277 */
278 if (response[2] || response[3])
279 return sprintf(buf, "%d.%d\n", response[2], response[3]);
280
281 ret = exc3000_vendor_data_request(data, (u8[]){'D'}, 1, response, 1);
282 if (ret < 0)
283 return ret;
284
285 return sprintf(buf, "%s\n", &response[1]);
286}
287static DEVICE_ATTR_RO(fw_version);
288
289static ssize_t model_show(struct device *dev,
290 struct device_attribute *attr, char *buf)
291{
292 struct i2c_client *client = to_i2c_client(dev);
293 struct exc3000_data *data = i2c_get_clientdata(client);
294 u8 response[EXC3000_LEN_FRAME];
295 int ret;
296
297 ret = exc3000_vendor_data_request(data, (u8[]){'E'}, 1, response, 1);
298 if (ret < 0)
299 return ret;
300
301 return sprintf(buf, "%s\n", &response[1]);
302}
303static DEVICE_ATTR_RO(model);
304
305static ssize_t type_show(struct device *dev,
306 struct device_attribute *attr, char *buf)
307{
308 struct i2c_client *client = to_i2c_client(dev);
309 struct exc3000_data *data = i2c_get_clientdata(client);
310 u8 response[EXC3000_LEN_FRAME];
311 int ret;
312
313 ret = exc3000_vendor_data_request(data, (u8[]){'F'}, 1, response, 1);
314 if (ret < 0)
315 return ret;
316
317 return sprintf(buf, "%s\n", &response[1]);
318}
319static DEVICE_ATTR_RO(type);
320
321static struct attribute *sysfs_attrs[] = {
322 &dev_attr_fw_version.attr,
323 &dev_attr_model.attr,
324 &dev_attr_type.attr,
325 NULL
326};
327
328static struct attribute_group exc3000_attribute_group = {
329 .attrs = sysfs_attrs
330};
331
332static int exc3000_probe(struct i2c_client *client)
333{
334 struct exc3000_data *data;
335 struct input_dev *input;
336 int error, max_xy, retry;
337
338 data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
339 if (!data)
340 return -ENOMEM;
341
342 data->client = client;
343 data->info = device_get_match_data(&client->dev);
344 if (!data->info) {
345 enum eeti_dev_id eeti_dev_id =
346 i2c_match_id(exc3000_id, client)->driver_data;
347 data->info = &exc3000_info[eeti_dev_id];
348 }
349 timer_setup(&data->timer, exc3000_timer, 0);
350 init_completion(&data->wait_event);
351 mutex_init(&data->query_lock);
352
353 data->reset = devm_gpiod_get_optional(&client->dev, "reset",
354 GPIOD_OUT_HIGH);
355 if (IS_ERR(data->reset))
356 return PTR_ERR(data->reset);
357
358 if (data->reset) {
359 msleep(EXC3000_RESET_MS);
360 gpiod_set_value_cansleep(data->reset, 0);
361 msleep(EXC3000_READY_MS);
362 }
363
364 input = devm_input_allocate_device(&client->dev);
365 if (!input)
366 return -ENOMEM;
367
368 data->input = input;
369 input_set_drvdata(input, data);
370
371 input->name = data->info->name;
372 input->id.bustype = BUS_I2C;
373
374 max_xy = data->info->max_xy;
375 input_set_abs_params(input, ABS_MT_POSITION_X, 0, max_xy, 0, 0);
376 input_set_abs_params(input, ABS_MT_POSITION_Y, 0, max_xy, 0, 0);
377
378 touchscreen_parse_properties(input, true, &data->prop);
379
380 error = input_mt_init_slots(input, EXC3000_NUM_SLOTS,
381 INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
382 if (error)
383 return error;
384
385 error = input_register_device(input);
386 if (error)
387 return error;
388
389 error = devm_request_threaded_irq(&client->dev, client->irq,
390 NULL, exc3000_interrupt, IRQF_ONESHOT,
391 client->name, data);
392 if (error)
393 return error;
394
395 /*
396 * I²C does not have built-in recovery, so retry on failure. This
397 * ensures, that the device probe will not fail for temporary issues
398 * on the bus. This is not needed for the sysfs calls (userspace
399 * will receive the error code and can start another query) and
400 * cannot be done for touch events (but that only means loosing one
401 * or two touch events anyways).
402 */
403 for (retry = 0; retry < 3; retry++) {
404 u8 response[EXC3000_LEN_FRAME];
405
406 error = exc3000_vendor_data_request(data, (u8[]){'E'}, 1,
407 response, 1);
408 if (error > 0) {
409 dev_dbg(&client->dev, "TS Model: %s", &response[1]);
410 error = 0;
411 break;
412 }
413 dev_warn(&client->dev, "Retry %d get EETI EXC3000 model: %d\n",
414 retry + 1, error);
415 }
416
417 if (error)
418 return error;
419
420 i2c_set_clientdata(client, data);
421
422 error = devm_device_add_group(&client->dev, &exc3000_attribute_group);
423 if (error)
424 return error;
425
426 return 0;
427}
428
429static const struct i2c_device_id exc3000_id[] = {
430 { "exc3000", EETI_EXC3000 },
431 { "exc80h60", EETI_EXC80H60 },
432 { "exc80h84", EETI_EXC80H84 },
433 { }
434};
435MODULE_DEVICE_TABLE(i2c, exc3000_id);
436
437#ifdef CONFIG_OF
438static const struct of_device_id exc3000_of_match[] = {
439 { .compatible = "eeti,exc3000", .data = &exc3000_info[EETI_EXC3000] },
440 { .compatible = "eeti,exc80h60", .data = &exc3000_info[EETI_EXC80H60] },
441 { .compatible = "eeti,exc80h84", .data = &exc3000_info[EETI_EXC80H84] },
442 { }
443};
444MODULE_DEVICE_TABLE(of, exc3000_of_match);
445#endif
446
447static struct i2c_driver exc3000_driver = {
448 .driver = {
449 .name = "exc3000",
450 .of_match_table = of_match_ptr(exc3000_of_match),
451 },
452 .id_table = exc3000_id,
453 .probe_new = exc3000_probe,
454};
455
456module_i2c_driver(exc3000_driver);
457
458MODULE_AUTHOR("Ahmet Inan <inan@distec.de>");
459MODULE_DESCRIPTION("I2C connected EETI EXC3000 multiple touch controller driver");
460MODULE_LICENSE("GPL v2");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Driver for I2C connected EETI EXC3000 multiple touch controller
4 *
5 * Copyright (C) 2017 Ahmet Inan <inan@distec.de>
6 *
7 * minimal implementation based on egalax_ts.c and egalax_i2c.c
8 */
9
10#include <linux/bitops.h>
11#include <linux/delay.h>
12#include <linux/device.h>
13#include <linux/gpio/consumer.h>
14#include <linux/i2c.h>
15#include <linux/input.h>
16#include <linux/input/mt.h>
17#include <linux/input/touchscreen.h>
18#include <linux/interrupt.h>
19#include <linux/module.h>
20#include <linux/of.h>
21#include <linux/sizes.h>
22#include <linux/timer.h>
23#include <asm/unaligned.h>
24
25#define EXC3000_NUM_SLOTS 10
26#define EXC3000_SLOTS_PER_FRAME 5
27#define EXC3000_LEN_FRAME 66
28#define EXC3000_LEN_POINT 10
29
30#define EXC3000_LEN_MODEL_NAME 16
31#define EXC3000_LEN_FW_VERSION 16
32
33#define EXC3000_MT1_EVENT 0x06
34#define EXC3000_MT2_EVENT 0x18
35
36#define EXC3000_TIMEOUT_MS 100
37
38#define EXC3000_RESET_MS 10
39#define EXC3000_READY_MS 100
40
41static const struct i2c_device_id exc3000_id[];
42
43struct eeti_dev_info {
44 const char *name;
45 int max_xy;
46};
47
48enum eeti_dev_id {
49 EETI_EXC3000,
50 EETI_EXC80H60,
51 EETI_EXC80H84,
52};
53
54static struct eeti_dev_info exc3000_info[] = {
55 [EETI_EXC3000] = {
56 .name = "EETI EXC3000 Touch Screen",
57 .max_xy = SZ_4K - 1,
58 },
59 [EETI_EXC80H60] = {
60 .name = "EETI EXC80H60 Touch Screen",
61 .max_xy = SZ_16K - 1,
62 },
63 [EETI_EXC80H84] = {
64 .name = "EETI EXC80H84 Touch Screen",
65 .max_xy = SZ_16K - 1,
66 },
67};
68
69struct exc3000_data {
70 struct i2c_client *client;
71 const struct eeti_dev_info *info;
72 struct input_dev *input;
73 struct touchscreen_properties prop;
74 struct gpio_desc *reset;
75 struct timer_list timer;
76 u8 buf[2 * EXC3000_LEN_FRAME];
77 struct completion wait_event;
78 struct mutex query_lock;
79 int query_result;
80 char model[EXC3000_LEN_MODEL_NAME];
81 char fw_version[EXC3000_LEN_FW_VERSION];
82};
83
84static void exc3000_report_slots(struct input_dev *input,
85 struct touchscreen_properties *prop,
86 const u8 *buf, int num)
87{
88 for (; num--; buf += EXC3000_LEN_POINT) {
89 if (buf[0] & BIT(0)) {
90 input_mt_slot(input, buf[1]);
91 input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
92 touchscreen_report_pos(input, prop,
93 get_unaligned_le16(buf + 2),
94 get_unaligned_le16(buf + 4),
95 true);
96 }
97 }
98}
99
100static void exc3000_timer(struct timer_list *t)
101{
102 struct exc3000_data *data = from_timer(data, t, timer);
103
104 input_mt_sync_frame(data->input);
105 input_sync(data->input);
106}
107
108static int exc3000_read_frame(struct exc3000_data *data, u8 *buf)
109{
110 struct i2c_client *client = data->client;
111 u8 expected_event = EXC3000_MT1_EVENT;
112 int ret;
113
114 if (data->info->max_xy == SZ_16K - 1)
115 expected_event = EXC3000_MT2_EVENT;
116
117 ret = i2c_master_send(client, "'", 2);
118 if (ret < 0)
119 return ret;
120
121 if (ret != 2)
122 return -EIO;
123
124 ret = i2c_master_recv(client, buf, EXC3000_LEN_FRAME);
125 if (ret < 0)
126 return ret;
127
128 if (ret != EXC3000_LEN_FRAME)
129 return -EIO;
130
131 if (get_unaligned_le16(buf) != EXC3000_LEN_FRAME)
132 return -EINVAL;
133
134 if (buf[2] != expected_event)
135 return -EINVAL;
136
137 return 0;
138}
139
140static int exc3000_read_data(struct exc3000_data *data,
141 u8 *buf, int *n_slots)
142{
143 int error;
144
145 error = exc3000_read_frame(data, buf);
146 if (error)
147 return error;
148
149 *n_slots = buf[3];
150 if (!*n_slots || *n_slots > EXC3000_NUM_SLOTS)
151 return -EINVAL;
152
153 if (*n_slots > EXC3000_SLOTS_PER_FRAME) {
154 /* Read 2nd frame to get the rest of the contacts. */
155 error = exc3000_read_frame(data, buf + EXC3000_LEN_FRAME);
156 if (error)
157 return error;
158
159 /* 2nd chunk must have number of contacts set to 0. */
160 if (buf[EXC3000_LEN_FRAME + 3] != 0)
161 return -EINVAL;
162 }
163
164 return 0;
165}
166
167static int exc3000_query_interrupt(struct exc3000_data *data)
168{
169 u8 *buf = data->buf;
170 int error;
171
172 error = i2c_master_recv(data->client, buf, EXC3000_LEN_FRAME);
173 if (error < 0)
174 return error;
175
176 if (buf[0] != 'B')
177 return -EPROTO;
178
179 if (buf[4] == 'E')
180 strlcpy(data->model, buf + 5, sizeof(data->model));
181 else if (buf[4] == 'D')
182 strlcpy(data->fw_version, buf + 5, sizeof(data->fw_version));
183 else
184 return -EPROTO;
185
186 return 0;
187}
188
189static irqreturn_t exc3000_interrupt(int irq, void *dev_id)
190{
191 struct exc3000_data *data = dev_id;
192 struct input_dev *input = data->input;
193 u8 *buf = data->buf;
194 int slots, total_slots;
195 int error;
196
197 if (mutex_is_locked(&data->query_lock)) {
198 data->query_result = exc3000_query_interrupt(data);
199 complete(&data->wait_event);
200 goto out;
201 }
202
203 error = exc3000_read_data(data, buf, &total_slots);
204 if (error) {
205 /* Schedule a timer to release "stuck" contacts */
206 mod_timer(&data->timer,
207 jiffies + msecs_to_jiffies(EXC3000_TIMEOUT_MS));
208 goto out;
209 }
210
211 /*
212 * We read full state successfully, no contacts will be "stuck".
213 */
214 del_timer_sync(&data->timer);
215
216 while (total_slots > 0) {
217 slots = min(total_slots, EXC3000_SLOTS_PER_FRAME);
218 exc3000_report_slots(input, &data->prop, buf + 4, slots);
219 total_slots -= slots;
220 buf += EXC3000_LEN_FRAME;
221 }
222
223 input_mt_sync_frame(input);
224 input_sync(input);
225
226out:
227 return IRQ_HANDLED;
228}
229
230static ssize_t fw_version_show(struct device *dev,
231 struct device_attribute *attr, char *buf)
232{
233 struct i2c_client *client = to_i2c_client(dev);
234 struct exc3000_data *data = i2c_get_clientdata(client);
235 static const u8 request[68] = {
236 0x67, 0x00, 0x42, 0x00, 0x03, 0x01, 'D', 0x00
237 };
238 int error;
239
240 mutex_lock(&data->query_lock);
241
242 data->query_result = -ETIMEDOUT;
243 reinit_completion(&data->wait_event);
244
245 error = i2c_master_send(client, request, sizeof(request));
246 if (error < 0) {
247 mutex_unlock(&data->query_lock);
248 return error;
249 }
250
251 wait_for_completion_interruptible_timeout(&data->wait_event, 1 * HZ);
252 mutex_unlock(&data->query_lock);
253
254 if (data->query_result < 0)
255 return data->query_result;
256
257 return sprintf(buf, "%s\n", data->fw_version);
258}
259static DEVICE_ATTR_RO(fw_version);
260
261static ssize_t exc3000_get_model(struct exc3000_data *data)
262{
263 static const u8 request[68] = {
264 0x67, 0x00, 0x42, 0x00, 0x03, 0x01, 'E', 0x00
265 };
266 struct i2c_client *client = data->client;
267 int error;
268
269 mutex_lock(&data->query_lock);
270 data->query_result = -ETIMEDOUT;
271 reinit_completion(&data->wait_event);
272
273 error = i2c_master_send(client, request, sizeof(request));
274 if (error < 0) {
275 mutex_unlock(&data->query_lock);
276 return error;
277 }
278
279 wait_for_completion_interruptible_timeout(&data->wait_event, 1 * HZ);
280 mutex_unlock(&data->query_lock);
281
282 return data->query_result;
283}
284
285static ssize_t model_show(struct device *dev,
286 struct device_attribute *attr, char *buf)
287{
288 struct i2c_client *client = to_i2c_client(dev);
289 struct exc3000_data *data = i2c_get_clientdata(client);
290 int error;
291
292 error = exc3000_get_model(data);
293 if (error < 0)
294 return error;
295
296 return sprintf(buf, "%s\n", data->model);
297}
298static DEVICE_ATTR_RO(model);
299
300static struct attribute *sysfs_attrs[] = {
301 &dev_attr_fw_version.attr,
302 &dev_attr_model.attr,
303 NULL
304};
305
306static struct attribute_group exc3000_attribute_group = {
307 .attrs = sysfs_attrs
308};
309
310static int exc3000_probe(struct i2c_client *client)
311{
312 struct exc3000_data *data;
313 struct input_dev *input;
314 int error, max_xy, retry;
315
316 data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
317 if (!data)
318 return -ENOMEM;
319
320 data->client = client;
321 data->info = device_get_match_data(&client->dev);
322 if (!data->info) {
323 enum eeti_dev_id eeti_dev_id =
324 i2c_match_id(exc3000_id, client)->driver_data;
325 data->info = &exc3000_info[eeti_dev_id];
326 }
327 timer_setup(&data->timer, exc3000_timer, 0);
328 init_completion(&data->wait_event);
329 mutex_init(&data->query_lock);
330
331 data->reset = devm_gpiod_get_optional(&client->dev, "reset",
332 GPIOD_OUT_HIGH);
333 if (IS_ERR(data->reset))
334 return PTR_ERR(data->reset);
335
336 if (data->reset) {
337 msleep(EXC3000_RESET_MS);
338 gpiod_set_value_cansleep(data->reset, 0);
339 msleep(EXC3000_READY_MS);
340 }
341
342 input = devm_input_allocate_device(&client->dev);
343 if (!input)
344 return -ENOMEM;
345
346 data->input = input;
347 input_set_drvdata(input, data);
348
349 input->name = data->info->name;
350 input->id.bustype = BUS_I2C;
351
352 max_xy = data->info->max_xy;
353 input_set_abs_params(input, ABS_MT_POSITION_X, 0, max_xy, 0, 0);
354 input_set_abs_params(input, ABS_MT_POSITION_Y, 0, max_xy, 0, 0);
355
356 touchscreen_parse_properties(input, true, &data->prop);
357
358 error = input_mt_init_slots(input, EXC3000_NUM_SLOTS,
359 INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
360 if (error)
361 return error;
362
363 error = input_register_device(input);
364 if (error)
365 return error;
366
367 error = devm_request_threaded_irq(&client->dev, client->irq,
368 NULL, exc3000_interrupt, IRQF_ONESHOT,
369 client->name, data);
370 if (error)
371 return error;
372
373 /*
374 * I²C does not have built-in recovery, so retry on failure. This
375 * ensures, that the device probe will not fail for temporary issues
376 * on the bus. This is not needed for the sysfs calls (userspace
377 * will receive the error code and can start another query) and
378 * cannot be done for touch events (but that only means loosing one
379 * or two touch events anyways).
380 */
381 for (retry = 0; retry < 3; retry++) {
382 error = exc3000_get_model(data);
383 if (!error)
384 break;
385 dev_warn(&client->dev, "Retry %d get EETI EXC3000 model: %d\n",
386 retry + 1, error);
387 }
388
389 if (error)
390 return error;
391
392 dev_dbg(&client->dev, "TS Model: %s", data->model);
393
394 i2c_set_clientdata(client, data);
395
396 error = devm_device_add_group(&client->dev, &exc3000_attribute_group);
397 if (error)
398 return error;
399
400 return 0;
401}
402
403static const struct i2c_device_id exc3000_id[] = {
404 { "exc3000", EETI_EXC3000 },
405 { "exc80h60", EETI_EXC80H60 },
406 { "exc80h84", EETI_EXC80H84 },
407 { }
408};
409MODULE_DEVICE_TABLE(i2c, exc3000_id);
410
411#ifdef CONFIG_OF
412static const struct of_device_id exc3000_of_match[] = {
413 { .compatible = "eeti,exc3000", .data = &exc3000_info[EETI_EXC3000] },
414 { .compatible = "eeti,exc80h60", .data = &exc3000_info[EETI_EXC80H60] },
415 { .compatible = "eeti,exc80h84", .data = &exc3000_info[EETI_EXC80H84] },
416 { }
417};
418MODULE_DEVICE_TABLE(of, exc3000_of_match);
419#endif
420
421static struct i2c_driver exc3000_driver = {
422 .driver = {
423 .name = "exc3000",
424 .of_match_table = of_match_ptr(exc3000_of_match),
425 },
426 .id_table = exc3000_id,
427 .probe_new = exc3000_probe,
428};
429
430module_i2c_driver(exc3000_driver);
431
432MODULE_AUTHOR("Ahmet Inan <inan@distec.de>");
433MODULE_DESCRIPTION("I2C connected EETI EXC3000 multiple touch controller driver");
434MODULE_LICENSE("GPL v2");