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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/acpi.h>
11#include <linux/bitops.h>
12#include <linux/delay.h>
13#include <linux/device.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/regulator/consumer.h>
23#include <linux/sizes.h>
24#include <linux/timer.h>
25#include <asm/unaligned.h>
26
27#define EXC3000_NUM_SLOTS 10
28#define EXC3000_SLOTS_PER_FRAME 5
29#define EXC3000_LEN_FRAME 66
30#define EXC3000_LEN_VENDOR_REQUEST 68
31#define EXC3000_LEN_POINT 10
32
33#define EXC3000_LEN_MODEL_NAME 16
34#define EXC3000_LEN_FW_VERSION 16
35
36#define EXC3000_VENDOR_EVENT 0x03
37#define EXC3000_MT1_EVENT 0x06
38#define EXC3000_MT2_EVENT 0x18
39
40#define EXC3000_TIMEOUT_MS 100
41
42#define EXC3000_RESET_MS 10
43#define EXC3000_READY_MS 100
44
45static const struct i2c_device_id exc3000_id[];
46
47struct eeti_dev_info {
48 const char *name;
49 int max_xy;
50};
51
52enum eeti_dev_id {
53 EETI_EXC3000,
54 EETI_EXC80H60,
55 EETI_EXC80H84,
56};
57
58static struct eeti_dev_info exc3000_info[] = {
59 [EETI_EXC3000] = {
60 .name = "EETI EXC3000 Touch Screen",
61 .max_xy = SZ_4K - 1,
62 },
63 [EETI_EXC80H60] = {
64 .name = "EETI EXC80H60 Touch Screen",
65 .max_xy = SZ_16K - 1,
66 },
67 [EETI_EXC80H84] = {
68 .name = "EETI EXC80H84 Touch Screen",
69 .max_xy = SZ_16K - 1,
70 },
71};
72
73struct exc3000_data {
74 struct i2c_client *client;
75 const struct eeti_dev_info *info;
76 struct input_dev *input;
77 struct touchscreen_properties prop;
78 struct gpio_desc *reset;
79 struct timer_list timer;
80 u8 buf[2 * EXC3000_LEN_FRAME];
81 struct completion wait_event;
82 struct mutex query_lock;
83};
84
85static void exc3000_report_slots(struct input_dev *input,
86 struct touchscreen_properties *prop,
87 const u8 *buf, int num)
88{
89 for (; num--; buf += EXC3000_LEN_POINT) {
90 if (buf[0] & BIT(0)) {
91 input_mt_slot(input, buf[1]);
92 input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
93 touchscreen_report_pos(input, prop,
94 get_unaligned_le16(buf + 2),
95 get_unaligned_le16(buf + 4),
96 true);
97 }
98 }
99}
100
101static void exc3000_timer(struct timer_list *t)
102{
103 struct exc3000_data *data = from_timer(data, t, timer);
104
105 input_mt_sync_frame(data->input);
106 input_sync(data->input);
107}
108
109static inline void exc3000_schedule_timer(struct exc3000_data *data)
110{
111 mod_timer(&data->timer, jiffies + msecs_to_jiffies(EXC3000_TIMEOUT_MS));
112}
113
114static void exc3000_shutdown_timer(void *timer)
115{
116 timer_shutdown_sync(timer);
117}
118
119static int exc3000_read_frame(struct exc3000_data *data, u8 *buf)
120{
121 struct i2c_client *client = data->client;
122 int ret;
123
124 ret = i2c_master_send(client, "'", 2);
125 if (ret < 0)
126 return ret;
127
128 if (ret != 2)
129 return -EIO;
130
131 ret = i2c_master_recv(client, buf, EXC3000_LEN_FRAME);
132 if (ret < 0)
133 return ret;
134
135 if (ret != EXC3000_LEN_FRAME)
136 return -EIO;
137
138 if (get_unaligned_le16(buf) != EXC3000_LEN_FRAME)
139 return -EINVAL;
140
141 return 0;
142}
143
144static int exc3000_handle_mt_event(struct exc3000_data *data)
145{
146 struct input_dev *input = data->input;
147 int ret, total_slots;
148 u8 *buf = data->buf;
149
150 total_slots = buf[3];
151 if (!total_slots || total_slots > EXC3000_NUM_SLOTS) {
152 ret = -EINVAL;
153 goto out_fail;
154 }
155
156 if (total_slots > EXC3000_SLOTS_PER_FRAME) {
157 /* Read 2nd frame to get the rest of the contacts. */
158 ret = exc3000_read_frame(data, buf + EXC3000_LEN_FRAME);
159 if (ret)
160 goto out_fail;
161
162 /* 2nd chunk must have number of contacts set to 0. */
163 if (buf[EXC3000_LEN_FRAME + 3] != 0) {
164 ret = -EINVAL;
165 goto out_fail;
166 }
167 }
168
169 /*
170 * We read full state successfully, no contacts will be "stuck".
171 */
172 del_timer_sync(&data->timer);
173
174 while (total_slots > 0) {
175 int slots = min(total_slots, EXC3000_SLOTS_PER_FRAME);
176
177 exc3000_report_slots(input, &data->prop, buf + 4, slots);
178 total_slots -= slots;
179 buf += EXC3000_LEN_FRAME;
180 }
181
182 input_mt_sync_frame(input);
183 input_sync(input);
184
185 return 0;
186
187out_fail:
188 /* Schedule a timer to release "stuck" contacts */
189 exc3000_schedule_timer(data);
190
191 return ret;
192}
193
194static irqreturn_t exc3000_interrupt(int irq, void *dev_id)
195{
196 struct exc3000_data *data = dev_id;
197 u8 *buf = data->buf;
198 int ret;
199
200 ret = exc3000_read_frame(data, buf);
201 if (ret) {
202 /* Schedule a timer to release "stuck" contacts */
203 exc3000_schedule_timer(data);
204 goto out;
205 }
206
207 switch (buf[2]) {
208 case EXC3000_VENDOR_EVENT:
209 complete(&data->wait_event);
210 break;
211
212 case EXC3000_MT1_EVENT:
213 case EXC3000_MT2_EVENT:
214 exc3000_handle_mt_event(data);
215 break;
216
217 default:
218 break;
219 }
220
221out:
222 return IRQ_HANDLED;
223}
224
225static int exc3000_vendor_data_request(struct exc3000_data *data, u8 *request,
226 u8 request_len, u8 *response, int timeout)
227{
228 u8 buf[EXC3000_LEN_VENDOR_REQUEST] = { 0x67, 0x00, 0x42, 0x00, 0x03 };
229 int ret;
230 unsigned long time_left;
231
232 mutex_lock(&data->query_lock);
233
234 reinit_completion(&data->wait_event);
235
236 buf[5] = request_len;
237 memcpy(&buf[6], request, request_len);
238
239 ret = i2c_master_send(data->client, buf, EXC3000_LEN_VENDOR_REQUEST);
240 if (ret < 0)
241 goto out_unlock;
242
243 if (response) {
244 time_left = wait_for_completion_timeout(&data->wait_event,
245 timeout * HZ);
246 if (time_left == 0) {
247 ret = -ETIMEDOUT;
248 goto out_unlock;
249 }
250
251 if (data->buf[3] >= EXC3000_LEN_FRAME) {
252 ret = -ENOSPC;
253 goto out_unlock;
254 }
255
256 memcpy(response, &data->buf[4], data->buf[3]);
257 ret = data->buf[3];
258 }
259
260out_unlock:
261 mutex_unlock(&data->query_lock);
262
263 return ret;
264}
265
266static ssize_t fw_version_show(struct device *dev,
267 struct device_attribute *attr, char *buf)
268{
269 struct i2c_client *client = to_i2c_client(dev);
270 struct exc3000_data *data = i2c_get_clientdata(client);
271 u8 response[EXC3000_LEN_FRAME];
272 int ret;
273
274 /* query bootloader info */
275 ret = exc3000_vendor_data_request(data,
276 (u8[]){0x39, 0x02}, 2, response, 1);
277 if (ret < 0)
278 return ret;
279
280 /*
281 * If the bootloader version is non-zero then the device is in
282 * bootloader mode and won't answer a query for the application FW
283 * version, so we just use the bootloader version info.
284 */
285 if (response[2] || response[3])
286 return sprintf(buf, "%d.%d\n", response[2], response[3]);
287
288 ret = exc3000_vendor_data_request(data, (u8[]){'D'}, 1, response, 1);
289 if (ret < 0)
290 return ret;
291
292 return sprintf(buf, "%s\n", &response[1]);
293}
294static DEVICE_ATTR_RO(fw_version);
295
296static ssize_t model_show(struct device *dev,
297 struct device_attribute *attr, char *buf)
298{
299 struct i2c_client *client = to_i2c_client(dev);
300 struct exc3000_data *data = i2c_get_clientdata(client);
301 u8 response[EXC3000_LEN_FRAME];
302 int ret;
303
304 ret = exc3000_vendor_data_request(data, (u8[]){'E'}, 1, response, 1);
305 if (ret < 0)
306 return ret;
307
308 return sprintf(buf, "%s\n", &response[1]);
309}
310static DEVICE_ATTR_RO(model);
311
312static ssize_t type_show(struct device *dev,
313 struct device_attribute *attr, char *buf)
314{
315 struct i2c_client *client = to_i2c_client(dev);
316 struct exc3000_data *data = i2c_get_clientdata(client);
317 u8 response[EXC3000_LEN_FRAME];
318 int ret;
319
320 ret = exc3000_vendor_data_request(data, (u8[]){'F'}, 1, response, 1);
321 if (ret < 0)
322 return ret;
323
324 return sprintf(buf, "%s\n", &response[1]);
325}
326static DEVICE_ATTR_RO(type);
327
328static struct attribute *exc3000_attrs[] = {
329 &dev_attr_fw_version.attr,
330 &dev_attr_model.attr,
331 &dev_attr_type.attr,
332 NULL
333};
334ATTRIBUTE_GROUPS(exc3000);
335
336static int exc3000_probe(struct i2c_client *client)
337{
338 struct exc3000_data *data;
339 struct input_dev *input;
340 int error, max_xy, retry;
341
342 data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
343 if (!data)
344 return -ENOMEM;
345
346 data->client = client;
347 data->info = device_get_match_data(&client->dev);
348 if (!data->info) {
349 enum eeti_dev_id eeti_dev_id =
350 i2c_match_id(exc3000_id, client)->driver_data;
351 data->info = &exc3000_info[eeti_dev_id];
352 }
353 timer_setup(&data->timer, exc3000_timer, 0);
354 init_completion(&data->wait_event);
355 mutex_init(&data->query_lock);
356
357 data->reset = devm_gpiod_get_optional(&client->dev, "reset",
358 GPIOD_OUT_HIGH);
359 if (IS_ERR(data->reset))
360 return PTR_ERR(data->reset);
361
362 /* For proper reset sequence, enable power while reset asserted */
363 error = devm_regulator_get_enable(&client->dev, "vdd");
364 if (error && error != -ENODEV)
365 return dev_err_probe(&client->dev, error,
366 "failed to request vdd regulator\n");
367
368 if (data->reset) {
369 msleep(EXC3000_RESET_MS);
370 gpiod_set_value_cansleep(data->reset, 0);
371 msleep(EXC3000_READY_MS);
372 }
373
374 input = devm_input_allocate_device(&client->dev);
375 if (!input)
376 return -ENOMEM;
377
378 data->input = input;
379 input_set_drvdata(input, data);
380
381 input->name = data->info->name;
382 input->id.bustype = BUS_I2C;
383
384 max_xy = data->info->max_xy;
385 input_set_abs_params(input, ABS_MT_POSITION_X, 0, max_xy, 0, 0);
386 input_set_abs_params(input, ABS_MT_POSITION_Y, 0, max_xy, 0, 0);
387
388 touchscreen_parse_properties(input, true, &data->prop);
389
390 error = input_mt_init_slots(input, EXC3000_NUM_SLOTS,
391 INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
392 if (error)
393 return error;
394
395 error = input_register_device(input);
396 if (error)
397 return error;
398
399 error = devm_add_action_or_reset(&client->dev, exc3000_shutdown_timer,
400 &data->timer);
401 if (error)
402 return error;
403
404 error = devm_request_threaded_irq(&client->dev, client->irq,
405 NULL, exc3000_interrupt, IRQF_ONESHOT,
406 client->name, data);
407 if (error)
408 return error;
409
410 /*
411 * I²C does not have built-in recovery, so retry on failure. This
412 * ensures, that the device probe will not fail for temporary issues
413 * on the bus. This is not needed for the sysfs calls (userspace
414 * will receive the error code and can start another query) and
415 * cannot be done for touch events (but that only means loosing one
416 * or two touch events anyways).
417 */
418 for (retry = 0; retry < 3; retry++) {
419 u8 response[EXC3000_LEN_FRAME];
420
421 error = exc3000_vendor_data_request(data, (u8[]){'E'}, 1,
422 response, 1);
423 if (error > 0) {
424 dev_dbg(&client->dev, "TS Model: %s", &response[1]);
425 error = 0;
426 break;
427 }
428 dev_warn(&client->dev, "Retry %d get EETI EXC3000 model: %d\n",
429 retry + 1, error);
430 }
431
432 if (error)
433 return error;
434
435 i2c_set_clientdata(client, data);
436
437 return 0;
438}
439
440static const struct i2c_device_id exc3000_id[] = {
441 { "exc3000", EETI_EXC3000 },
442 { "exc80h60", EETI_EXC80H60 },
443 { "exc80h84", EETI_EXC80H84 },
444 { }
445};
446MODULE_DEVICE_TABLE(i2c, exc3000_id);
447
448#ifdef CONFIG_OF
449static const struct of_device_id exc3000_of_match[] = {
450 { .compatible = "eeti,exc3000", .data = &exc3000_info[EETI_EXC3000] },
451 { .compatible = "eeti,exc80h60", .data = &exc3000_info[EETI_EXC80H60] },
452 { .compatible = "eeti,exc80h84", .data = &exc3000_info[EETI_EXC80H84] },
453 { }
454};
455MODULE_DEVICE_TABLE(of, exc3000_of_match);
456#endif
457
458#ifdef CONFIG_ACPI
459static const struct acpi_device_id exc3000_acpi_match[] = {
460 { "EGA00001", .driver_data = (kernel_ulong_t)&exc3000_info[EETI_EXC80H60] },
461 { }
462};
463MODULE_DEVICE_TABLE(acpi, exc3000_acpi_match);
464#endif
465
466static struct i2c_driver exc3000_driver = {
467 .driver = {
468 .name = "exc3000",
469 .dev_groups = exc3000_groups,
470 .of_match_table = of_match_ptr(exc3000_of_match),
471 .acpi_match_table = ACPI_PTR(exc3000_acpi_match),
472 },
473 .id_table = exc3000_id,
474 .probe = exc3000_probe,
475};
476
477module_i2c_driver(exc3000_driver);
478
479MODULE_AUTHOR("Ahmet Inan <inan@distec.de>");
480MODULE_DESCRIPTION("I2C connected EETI EXC3000 multiple touch controller driver");
481MODULE_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");