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8#include <asm/unaligned.h>
9#include <linux/delay.h>
10#include <linux/gpio/consumer.h>
11#include <linux/i2c.h>
12#include <linux/input.h>
13#include <linux/input/mt.h>
14#include <linux/input/touchscreen.h>
15#include <linux/interrupt.h>
16#include <linux/of_device.h>
17#include <linux/module.h>
18#include <linux/slab.h>
19
20#define PIXCIR_MAX_SLOTS 5
21
22
23
24
25#define PIXCIR_REG_POWER_MODE 51
26#define PIXCIR_REG_INT_MODE 52
27
28
29
30
31
32
33
34
35
36enum pixcir_power_mode {
37 PIXCIR_POWER_ACTIVE,
38 PIXCIR_POWER_IDLE,
39 PIXCIR_POWER_HALT,
40};
41
42#define PIXCIR_POWER_MODE_MASK 0x03
43#define PIXCIR_POWER_ALLOW_IDLE (1UL << 2)
44
45
46
47
48
49
50
51
52
53enum pixcir_int_mode {
54 PIXCIR_INT_PERIODICAL,
55 PIXCIR_INT_DIFF_COORD,
56 PIXCIR_INT_LEVEL_TOUCH,
57 PIXCIR_INT_PULSE_TOUCH,
58};
59
60#define PIXCIR_INT_MODE_MASK 0x03
61#define PIXCIR_INT_ENABLE (1UL << 3)
62#define PIXCIR_INT_POL_HIGH (1UL << 2)
63
64
65
66
67
68
69
70struct pixcir_i2c_chip_data {
71 u8 max_fingers;
72 bool has_hw_ids;
73};
74
75struct pixcir_i2c_ts_data {
76 struct i2c_client *client;
77 struct input_dev *input;
78 struct gpio_desc *gpio_attb;
79 struct gpio_desc *gpio_reset;
80 struct gpio_desc *gpio_enable;
81 struct gpio_desc *gpio_wake;
82 const struct pixcir_i2c_chip_data *chip;
83 struct touchscreen_properties prop;
84 bool running;
85};
86
87struct pixcir_report_data {
88 int num_touches;
89 struct input_mt_pos pos[PIXCIR_MAX_SLOTS];
90 int ids[PIXCIR_MAX_SLOTS];
91};
92
93static void pixcir_ts_parse(struct pixcir_i2c_ts_data *tsdata,
94 struct pixcir_report_data *report)
95{
96 u8 rdbuf[2 + PIXCIR_MAX_SLOTS * 5];
97 u8 wrbuf[1] = { 0 };
98 u8 *bufptr;
99 u8 touch;
100 int ret, i;
101 int readsize;
102 const struct pixcir_i2c_chip_data *chip = tsdata->chip;
103
104 memset(report, 0, sizeof(struct pixcir_report_data));
105
106 i = chip->has_hw_ids ? 1 : 0;
107 readsize = 2 + tsdata->chip->max_fingers * (4 + i);
108 if (readsize > sizeof(rdbuf))
109 readsize = sizeof(rdbuf);
110
111 ret = i2c_master_send(tsdata->client, wrbuf, sizeof(wrbuf));
112 if (ret != sizeof(wrbuf)) {
113 dev_err(&tsdata->client->dev,
114 "%s: i2c_master_send failed(), ret=%d\n",
115 __func__, ret);
116 return;
117 }
118
119 ret = i2c_master_recv(tsdata->client, rdbuf, readsize);
120 if (ret != readsize) {
121 dev_err(&tsdata->client->dev,
122 "%s: i2c_master_recv failed(), ret=%d\n",
123 __func__, ret);
124 return;
125 }
126
127 touch = rdbuf[0] & 0x7;
128 if (touch > tsdata->chip->max_fingers)
129 touch = tsdata->chip->max_fingers;
130
131 report->num_touches = touch;
132 bufptr = &rdbuf[2];
133
134 for (i = 0; i < touch; i++) {
135 touchscreen_set_mt_pos(&report->pos[i], &tsdata->prop,
136 get_unaligned_le16(bufptr),
137 get_unaligned_le16(bufptr + 2));
138 if (chip->has_hw_ids) {
139 report->ids[i] = bufptr[4];
140 bufptr = bufptr + 5;
141 } else {
142 bufptr = bufptr + 4;
143 }
144 }
145}
146
147static void pixcir_ts_report(struct pixcir_i2c_ts_data *ts,
148 struct pixcir_report_data *report)
149{
150 int slots[PIXCIR_MAX_SLOTS];
151 int n, i, slot;
152 struct device *dev = &ts->client->dev;
153 const struct pixcir_i2c_chip_data *chip = ts->chip;
154
155 n = report->num_touches;
156 if (n > PIXCIR_MAX_SLOTS)
157 n = PIXCIR_MAX_SLOTS;
158
159 if (!ts->chip->has_hw_ids)
160 input_mt_assign_slots(ts->input, slots, report->pos, n, 0);
161
162 for (i = 0; i < n; i++) {
163 if (chip->has_hw_ids) {
164 slot = input_mt_get_slot_by_key(ts->input,
165 report->ids[i]);
166 if (slot < 0) {
167 dev_dbg(dev, "no free slot for id 0x%x\n",
168 report->ids[i]);
169 continue;
170 }
171 } else {
172 slot = slots[i];
173 }
174
175 input_mt_slot(ts->input, slot);
176 input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, true);
177
178 input_report_abs(ts->input, ABS_MT_POSITION_X,
179 report->pos[i].x);
180 input_report_abs(ts->input, ABS_MT_POSITION_Y,
181 report->pos[i].y);
182
183 dev_dbg(dev, "%d: slot %d, x %d, y %d\n",
184 i, slot, report->pos[i].x, report->pos[i].y);
185 }
186
187 input_mt_sync_frame(ts->input);
188 input_sync(ts->input);
189}
190
191static irqreturn_t pixcir_ts_isr(int irq, void *dev_id)
192{
193 struct pixcir_i2c_ts_data *tsdata = dev_id;
194 struct pixcir_report_data report;
195
196 while (tsdata->running) {
197
198 pixcir_ts_parse(tsdata, &report);
199
200
201 pixcir_ts_report(tsdata, &report);
202
203 if (gpiod_get_value_cansleep(tsdata->gpio_attb)) {
204 if (report.num_touches) {
205
206
207
208
209 input_mt_sync_frame(tsdata->input);
210 input_sync(tsdata->input);
211 }
212 break;
213 }
214
215 msleep(20);
216 }
217
218 return IRQ_HANDLED;
219}
220
221static void pixcir_reset(struct pixcir_i2c_ts_data *tsdata)
222{
223 if (!IS_ERR_OR_NULL(tsdata->gpio_reset)) {
224 gpiod_set_value_cansleep(tsdata->gpio_reset, 1);
225 ndelay(100);
226 gpiod_set_value_cansleep(tsdata->gpio_reset, 0);
227
228 msleep(100);
229 }
230}
231
232static int pixcir_set_power_mode(struct pixcir_i2c_ts_data *ts,
233 enum pixcir_power_mode mode)
234{
235 struct device *dev = &ts->client->dev;
236 int ret;
237
238 if (mode == PIXCIR_POWER_ACTIVE || mode == PIXCIR_POWER_IDLE) {
239 if (ts->gpio_wake)
240 gpiod_set_value_cansleep(ts->gpio_wake, 1);
241 }
242
243 ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_POWER_MODE);
244 if (ret < 0) {
245 dev_err(dev, "%s: can't read reg %d : %d\n",
246 __func__, PIXCIR_REG_POWER_MODE, ret);
247 return ret;
248 }
249
250 ret &= ~PIXCIR_POWER_MODE_MASK;
251 ret |= mode;
252
253
254 ret |= PIXCIR_POWER_ALLOW_IDLE;
255
256 ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_POWER_MODE, ret);
257 if (ret < 0) {
258 dev_err(dev, "%s: can't write reg %d : %d\n",
259 __func__, PIXCIR_REG_POWER_MODE, ret);
260 return ret;
261 }
262
263 if (mode == PIXCIR_POWER_HALT) {
264 if (ts->gpio_wake)
265 gpiod_set_value_cansleep(ts->gpio_wake, 0);
266 }
267
268 return 0;
269}
270
271
272
273
274
275
276static int pixcir_set_int_mode(struct pixcir_i2c_ts_data *ts,
277 enum pixcir_int_mode mode, bool polarity)
278{
279 struct device *dev = &ts->client->dev;
280 int ret;
281
282 ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_INT_MODE);
283 if (ret < 0) {
284 dev_err(dev, "%s: can't read reg %d : %d\n",
285 __func__, PIXCIR_REG_INT_MODE, ret);
286 return ret;
287 }
288
289 ret &= ~PIXCIR_INT_MODE_MASK;
290 ret |= mode;
291
292 if (polarity)
293 ret |= PIXCIR_INT_POL_HIGH;
294 else
295 ret &= ~PIXCIR_INT_POL_HIGH;
296
297 ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_INT_MODE, ret);
298 if (ret < 0) {
299 dev_err(dev, "%s: can't write reg %d : %d\n",
300 __func__, PIXCIR_REG_INT_MODE, ret);
301 return ret;
302 }
303
304 return 0;
305}
306
307
308
309
310static int pixcir_int_enable(struct pixcir_i2c_ts_data *ts, bool enable)
311{
312 struct device *dev = &ts->client->dev;
313 int ret;
314
315 ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_INT_MODE);
316 if (ret < 0) {
317 dev_err(dev, "%s: can't read reg %d : %d\n",
318 __func__, PIXCIR_REG_INT_MODE, ret);
319 return ret;
320 }
321
322 if (enable)
323 ret |= PIXCIR_INT_ENABLE;
324 else
325 ret &= ~PIXCIR_INT_ENABLE;
326
327 ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_INT_MODE, ret);
328 if (ret < 0) {
329 dev_err(dev, "%s: can't write reg %d : %d\n",
330 __func__, PIXCIR_REG_INT_MODE, ret);
331 return ret;
332 }
333
334 return 0;
335}
336
337static int pixcir_start(struct pixcir_i2c_ts_data *ts)
338{
339 struct device *dev = &ts->client->dev;
340 int error;
341
342 if (ts->gpio_enable) {
343 gpiod_set_value_cansleep(ts->gpio_enable, 1);
344 msleep(100);
345 }
346
347
348 error = pixcir_set_int_mode(ts, PIXCIR_INT_LEVEL_TOUCH, 0);
349 if (error) {
350 dev_err(dev, "Failed to set interrupt mode: %d\n", error);
351 return error;
352 }
353
354 ts->running = true;
355 mb();
356
357
358 error = pixcir_int_enable(ts, true);
359 if (error) {
360 dev_err(dev, "Failed to enable interrupt generation: %d\n",
361 error);
362 return error;
363 }
364
365 return 0;
366}
367
368static int pixcir_stop(struct pixcir_i2c_ts_data *ts)
369{
370 int error;
371
372
373 error = pixcir_int_enable(ts, false);
374 if (error) {
375 dev_err(&ts->client->dev,
376 "Failed to disable interrupt generation: %d\n",
377 error);
378 return error;
379 }
380
381
382 ts->running = false;
383 mb();
384
385
386 synchronize_irq(ts->client->irq);
387
388 if (ts->gpio_enable)
389 gpiod_set_value_cansleep(ts->gpio_enable, 0);
390
391 return 0;
392}
393
394static int pixcir_input_open(struct input_dev *dev)
395{
396 struct pixcir_i2c_ts_data *ts = input_get_drvdata(dev);
397
398 return pixcir_start(ts);
399}
400
401static void pixcir_input_close(struct input_dev *dev)
402{
403 struct pixcir_i2c_ts_data *ts = input_get_drvdata(dev);
404
405 pixcir_stop(ts);
406}
407
408static int __maybe_unused pixcir_i2c_ts_suspend(struct device *dev)
409{
410 struct i2c_client *client = to_i2c_client(dev);
411 struct pixcir_i2c_ts_data *ts = i2c_get_clientdata(client);
412 struct input_dev *input = ts->input;
413 int ret = 0;
414
415 mutex_lock(&input->mutex);
416
417 if (device_may_wakeup(&client->dev)) {
418 if (!input_device_enabled(input)) {
419 ret = pixcir_start(ts);
420 if (ret) {
421 dev_err(dev, "Failed to start\n");
422 goto unlock;
423 }
424 }
425 } else if (input_device_enabled(input)) {
426 ret = pixcir_stop(ts);
427 }
428
429unlock:
430 mutex_unlock(&input->mutex);
431
432 return ret;
433}
434
435static int __maybe_unused pixcir_i2c_ts_resume(struct device *dev)
436{
437 struct i2c_client *client = to_i2c_client(dev);
438 struct pixcir_i2c_ts_data *ts = i2c_get_clientdata(client);
439 struct input_dev *input = ts->input;
440 int ret = 0;
441
442 mutex_lock(&input->mutex);
443
444 if (device_may_wakeup(&client->dev)) {
445 if (!input_device_enabled(input)) {
446 ret = pixcir_stop(ts);
447 if (ret) {
448 dev_err(dev, "Failed to stop\n");
449 goto unlock;
450 }
451 }
452 } else if (input_device_enabled(input)) {
453 ret = pixcir_start(ts);
454 }
455
456unlock:
457 mutex_unlock(&input->mutex);
458
459 return ret;
460}
461
462static SIMPLE_DEV_PM_OPS(pixcir_dev_pm_ops,
463 pixcir_i2c_ts_suspend, pixcir_i2c_ts_resume);
464
465static int pixcir_i2c_ts_probe(struct i2c_client *client,
466 const struct i2c_device_id *id)
467{
468 struct device *dev = &client->dev;
469 struct pixcir_i2c_ts_data *tsdata;
470 struct input_dev *input;
471 int error;
472
473 tsdata = devm_kzalloc(dev, sizeof(*tsdata), GFP_KERNEL);
474 if (!tsdata)
475 return -ENOMEM;
476
477 tsdata->chip = device_get_match_data(dev);
478 if (!tsdata->chip && id)
479 tsdata->chip = (const void *)id->driver_data;
480 if (!tsdata->chip) {
481 dev_err(dev, "can't locate chip data\n");
482 return -EINVAL;
483 }
484
485 input = devm_input_allocate_device(dev);
486 if (!input) {
487 dev_err(dev, "Failed to allocate input device\n");
488 return -ENOMEM;
489 }
490
491 tsdata->client = client;
492 tsdata->input = input;
493
494 input->name = client->name;
495 input->id.bustype = BUS_I2C;
496 input->open = pixcir_input_open;
497 input->close = pixcir_input_close;
498
499 input_set_capability(input, EV_ABS, ABS_MT_POSITION_X);
500 input_set_capability(input, EV_ABS, ABS_MT_POSITION_Y);
501 touchscreen_parse_properties(input, true, &tsdata->prop);
502 if (!input_abs_get_max(input, ABS_MT_POSITION_X) ||
503 !input_abs_get_max(input, ABS_MT_POSITION_Y)) {
504 dev_err(dev, "Touchscreen size is not specified\n");
505 return -EINVAL;
506 }
507
508 error = input_mt_init_slots(input, tsdata->chip->max_fingers,
509 INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
510 if (error) {
511 dev_err(dev, "Error initializing Multi-Touch slots\n");
512 return error;
513 }
514
515 input_set_drvdata(input, tsdata);
516
517 tsdata->gpio_attb = devm_gpiod_get(dev, "attb", GPIOD_IN);
518 if (IS_ERR(tsdata->gpio_attb)) {
519 error = PTR_ERR(tsdata->gpio_attb);
520 if (error != -EPROBE_DEFER)
521 dev_err(dev, "Failed to request ATTB gpio: %d\n",
522 error);
523 return error;
524 }
525
526 tsdata->gpio_reset = devm_gpiod_get_optional(dev, "reset",
527 GPIOD_OUT_LOW);
528 if (IS_ERR(tsdata->gpio_reset)) {
529 error = PTR_ERR(tsdata->gpio_reset);
530 if (error != -EPROBE_DEFER)
531 dev_err(dev, "Failed to request RESET gpio: %d\n",
532 error);
533 return error;
534 }
535
536 tsdata->gpio_wake = devm_gpiod_get_optional(dev, "wake",
537 GPIOD_OUT_HIGH);
538 if (IS_ERR(tsdata->gpio_wake)) {
539 error = PTR_ERR(tsdata->gpio_wake);
540 if (error != -EPROBE_DEFER)
541 dev_err(dev, "Failed to get wake gpio: %d\n", error);
542 return error;
543 }
544
545 tsdata->gpio_enable = devm_gpiod_get_optional(dev, "enable",
546 GPIOD_OUT_HIGH);
547 if (IS_ERR(tsdata->gpio_enable)) {
548 error = PTR_ERR(tsdata->gpio_enable);
549 if (error != -EPROBE_DEFER)
550 dev_err(dev, "Failed to get enable gpio: %d\n", error);
551 return error;
552 }
553
554 if (tsdata->gpio_enable)
555 msleep(100);
556
557 error = devm_request_threaded_irq(dev, client->irq, NULL, pixcir_ts_isr,
558 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
559 client->name, tsdata);
560 if (error) {
561 dev_err(dev, "failed to request irq %d\n", client->irq);
562 return error;
563 }
564
565 pixcir_reset(tsdata);
566
567
568 error = pixcir_set_power_mode(tsdata, PIXCIR_POWER_IDLE);
569 if (error) {
570 dev_err(dev, "Failed to set IDLE mode\n");
571 return error;
572 }
573
574
575 error = pixcir_stop(tsdata);
576 if (error)
577 return error;
578
579 error = input_register_device(input);
580 if (error)
581 return error;
582
583 i2c_set_clientdata(client, tsdata);
584
585 return 0;
586}
587
588static const struct pixcir_i2c_chip_data pixcir_ts_data = {
589 .max_fingers = 2,
590
591};
592
593static const struct pixcir_i2c_chip_data pixcir_tangoc_data = {
594 .max_fingers = 5,
595 .has_hw_ids = true,
596};
597
598static const struct i2c_device_id pixcir_i2c_ts_id[] = {
599 { "pixcir_ts", (unsigned long) &pixcir_ts_data },
600 { "pixcir_tangoc", (unsigned long) &pixcir_tangoc_data },
601 { }
602};
603MODULE_DEVICE_TABLE(i2c, pixcir_i2c_ts_id);
604
605#ifdef CONFIG_OF
606static const struct of_device_id pixcir_of_match[] = {
607 { .compatible = "pixcir,pixcir_ts", .data = &pixcir_ts_data },
608 { .compatible = "pixcir,pixcir_tangoc", .data = &pixcir_tangoc_data },
609 { }
610};
611MODULE_DEVICE_TABLE(of, pixcir_of_match);
612#endif
613
614static struct i2c_driver pixcir_i2c_ts_driver = {
615 .driver = {
616 .name = "pixcir_ts",
617 .pm = &pixcir_dev_pm_ops,
618 .of_match_table = of_match_ptr(pixcir_of_match),
619 },
620 .probe = pixcir_i2c_ts_probe,
621 .id_table = pixcir_i2c_ts_id,
622};
623
624module_i2c_driver(pixcir_i2c_ts_driver);
625
626MODULE_AUTHOR("Jianchun Bian <jcbian@pixcir.com.cn>, Dequan Meng <dqmeng@pixcir.com.cn>");
627MODULE_DESCRIPTION("Pixcir I2C Touchscreen Driver");
628MODULE_LICENSE("GPL");
629
