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1/*
2 * Driver for Pixcir I2C touchscreen controllers.
3 *
4 * Copyright (C) 2010-2011 Pixcir, Inc.
5 *
6 * This software is licensed under the terms of the GNU General Public
7 * License version 2, as published by the Free Software Foundation, and
8 * may be copied, distributed, and modified under those terms.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20#include <linux/delay.h>
21#include <linux/module.h>
22#include <linux/interrupt.h>
23#include <linux/slab.h>
24#include <linux/i2c.h>
25#include <linux/input.h>
26#include <linux/input/mt.h>
27#include <linux/input/touchscreen.h>
28#include <linux/gpio.h>
29#include <linux/gpio/consumer.h>
30/*#include <linux/of.h>*/
31#include <linux/of_device.h>
32#include <linux/platform_data/pixcir_i2c_ts.h>
33
34#define PIXCIR_MAX_SLOTS 5 /* Max fingers supported by driver */
35
36struct pixcir_i2c_ts_data {
37 struct i2c_client *client;
38 struct input_dev *input;
39 struct gpio_desc *gpio_attb;
40 struct gpio_desc *gpio_reset;
41 struct gpio_desc *gpio_enable;
42 struct gpio_desc *gpio_wake;
43 const struct pixcir_i2c_chip_data *chip;
44 int max_fingers; /* Max fingers supported in this instance */
45 bool running;
46};
47
48struct pixcir_touch {
49 int x;
50 int y;
51 int id;
52};
53
54struct pixcir_report_data {
55 int num_touches;
56 struct pixcir_touch touches[PIXCIR_MAX_SLOTS];
57};
58
59static void pixcir_ts_parse(struct pixcir_i2c_ts_data *tsdata,
60 struct pixcir_report_data *report)
61{
62 u8 rdbuf[2 + PIXCIR_MAX_SLOTS * 5];
63 u8 wrbuf[1] = { 0 };
64 u8 *bufptr;
65 u8 touch;
66 int ret, i;
67 int readsize;
68 const struct pixcir_i2c_chip_data *chip = tsdata->chip;
69
70 memset(report, 0, sizeof(struct pixcir_report_data));
71
72 i = chip->has_hw_ids ? 1 : 0;
73 readsize = 2 + tsdata->max_fingers * (4 + i);
74 if (readsize > sizeof(rdbuf))
75 readsize = sizeof(rdbuf);
76
77 ret = i2c_master_send(tsdata->client, wrbuf, sizeof(wrbuf));
78 if (ret != sizeof(wrbuf)) {
79 dev_err(&tsdata->client->dev,
80 "%s: i2c_master_send failed(), ret=%d\n",
81 __func__, ret);
82 return;
83 }
84
85 ret = i2c_master_recv(tsdata->client, rdbuf, readsize);
86 if (ret != readsize) {
87 dev_err(&tsdata->client->dev,
88 "%s: i2c_master_recv failed(), ret=%d\n",
89 __func__, ret);
90 return;
91 }
92
93 touch = rdbuf[0] & 0x7;
94 if (touch > tsdata->max_fingers)
95 touch = tsdata->max_fingers;
96
97 report->num_touches = touch;
98 bufptr = &rdbuf[2];
99
100 for (i = 0; i < touch; i++) {
101 report->touches[i].x = (bufptr[1] << 8) | bufptr[0];
102 report->touches[i].y = (bufptr[3] << 8) | bufptr[2];
103
104 if (chip->has_hw_ids) {
105 report->touches[i].id = bufptr[4];
106 bufptr = bufptr + 5;
107 } else {
108 bufptr = bufptr + 4;
109 }
110 }
111}
112
113static void pixcir_ts_report(struct pixcir_i2c_ts_data *ts,
114 struct pixcir_report_data *report)
115{
116 struct input_mt_pos pos[PIXCIR_MAX_SLOTS];
117 int slots[PIXCIR_MAX_SLOTS];
118 struct pixcir_touch *touch;
119 int n, i, slot;
120 struct device *dev = &ts->client->dev;
121 const struct pixcir_i2c_chip_data *chip = ts->chip;
122
123 n = report->num_touches;
124 if (n > PIXCIR_MAX_SLOTS)
125 n = PIXCIR_MAX_SLOTS;
126
127 if (!ts->chip->has_hw_ids) {
128 for (i = 0; i < n; i++) {
129 touch = &report->touches[i];
130 pos[i].x = touch->x;
131 pos[i].y = touch->y;
132 }
133
134 input_mt_assign_slots(ts->input, slots, pos, n, 0);
135 }
136
137 for (i = 0; i < n; i++) {
138 touch = &report->touches[i];
139
140 if (chip->has_hw_ids) {
141 slot = input_mt_get_slot_by_key(ts->input, touch->id);
142 if (slot < 0) {
143 dev_dbg(dev, "no free slot for id 0x%x\n",
144 touch->id);
145 continue;
146 }
147 } else {
148 slot = slots[i];
149 }
150
151 input_mt_slot(ts->input, slot);
152 input_mt_report_slot_state(ts->input,
153 MT_TOOL_FINGER, true);
154
155 input_event(ts->input, EV_ABS, ABS_MT_POSITION_X, touch->x);
156 input_event(ts->input, EV_ABS, ABS_MT_POSITION_Y, touch->y);
157
158 dev_dbg(dev, "%d: slot %d, x %d, y %d\n",
159 i, slot, touch->x, touch->y);
160 }
161
162 input_mt_sync_frame(ts->input);
163 input_sync(ts->input);
164}
165
166static irqreturn_t pixcir_ts_isr(int irq, void *dev_id)
167{
168 struct pixcir_i2c_ts_data *tsdata = dev_id;
169 struct pixcir_report_data report;
170
171 while (tsdata->running) {
172 /* parse packet */
173 pixcir_ts_parse(tsdata, &report);
174
175 /* report it */
176 pixcir_ts_report(tsdata, &report);
177
178 if (gpiod_get_value_cansleep(tsdata->gpio_attb)) {
179 if (report.num_touches) {
180 /*
181 * Last report with no finger up?
182 * Do it now then.
183 */
184 input_mt_sync_frame(tsdata->input);
185 input_sync(tsdata->input);
186 }
187 break;
188 }
189
190 msleep(20);
191 }
192
193 return IRQ_HANDLED;
194}
195
196static void pixcir_reset(struct pixcir_i2c_ts_data *tsdata)
197{
198 if (!IS_ERR_OR_NULL(tsdata->gpio_reset)) {
199 gpiod_set_value_cansleep(tsdata->gpio_reset, 1);
200 ndelay(100); /* datasheet section 1.2.3 says 80ns min. */
201 gpiod_set_value_cansleep(tsdata->gpio_reset, 0);
202 /* wait for controller ready. 100ms guess. */
203 msleep(100);
204 }
205}
206
207static int pixcir_set_power_mode(struct pixcir_i2c_ts_data *ts,
208 enum pixcir_power_mode mode)
209{
210 struct device *dev = &ts->client->dev;
211 int ret;
212
213 if (mode == PIXCIR_POWER_ACTIVE || mode == PIXCIR_POWER_IDLE) {
214 if (ts->gpio_wake)
215 gpiod_set_value_cansleep(ts->gpio_wake, 1);
216 }
217
218 ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_POWER_MODE);
219 if (ret < 0) {
220 dev_err(dev, "%s: can't read reg 0x%x : %d\n",
221 __func__, PIXCIR_REG_POWER_MODE, ret);
222 return ret;
223 }
224
225 ret &= ~PIXCIR_POWER_MODE_MASK;
226 ret |= mode;
227
228 /* Always AUTO_IDLE */
229 ret |= PIXCIR_POWER_ALLOW_IDLE;
230
231 ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_POWER_MODE, ret);
232 if (ret < 0) {
233 dev_err(dev, "%s: can't write reg 0x%x : %d\n",
234 __func__, PIXCIR_REG_POWER_MODE, ret);
235 return ret;
236 }
237
238 if (mode == PIXCIR_POWER_HALT) {
239 if (ts->gpio_wake)
240 gpiod_set_value_cansleep(ts->gpio_wake, 0);
241 }
242
243 return 0;
244}
245
246/*
247 * Set the interrupt mode for the device i.e. ATTB line behaviour
248 *
249 * @polarity : 1 for active high, 0 for active low.
250 */
251static int pixcir_set_int_mode(struct pixcir_i2c_ts_data *ts,
252 enum pixcir_int_mode mode, bool polarity)
253{
254 struct device *dev = &ts->client->dev;
255 int ret;
256
257 ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_INT_MODE);
258 if (ret < 0) {
259 dev_err(dev, "%s: can't read reg 0x%x : %d\n",
260 __func__, PIXCIR_REG_INT_MODE, ret);
261 return ret;
262 }
263
264 ret &= ~PIXCIR_INT_MODE_MASK;
265 ret |= mode;
266
267 if (polarity)
268 ret |= PIXCIR_INT_POL_HIGH;
269 else
270 ret &= ~PIXCIR_INT_POL_HIGH;
271
272 ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_INT_MODE, ret);
273 if (ret < 0) {
274 dev_err(dev, "%s: can't write reg 0x%x : %d\n",
275 __func__, PIXCIR_REG_INT_MODE, ret);
276 return ret;
277 }
278
279 return 0;
280}
281
282/*
283 * Enable/disable interrupt generation
284 */
285static int pixcir_int_enable(struct pixcir_i2c_ts_data *ts, bool enable)
286{
287 struct device *dev = &ts->client->dev;
288 int ret;
289
290 ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_INT_MODE);
291 if (ret < 0) {
292 dev_err(dev, "%s: can't read reg 0x%x : %d\n",
293 __func__, PIXCIR_REG_INT_MODE, ret);
294 return ret;
295 }
296
297 if (enable)
298 ret |= PIXCIR_INT_ENABLE;
299 else
300 ret &= ~PIXCIR_INT_ENABLE;
301
302 ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_INT_MODE, ret);
303 if (ret < 0) {
304 dev_err(dev, "%s: can't write reg 0x%x : %d\n",
305 __func__, PIXCIR_REG_INT_MODE, ret);
306 return ret;
307 }
308
309 return 0;
310}
311
312static int pixcir_start(struct pixcir_i2c_ts_data *ts)
313{
314 struct device *dev = &ts->client->dev;
315 int error;
316
317 if (ts->gpio_enable) {
318 gpiod_set_value_cansleep(ts->gpio_enable, 1);
319 msleep(100);
320 }
321
322 /* LEVEL_TOUCH interrupt with active low polarity */
323 error = pixcir_set_int_mode(ts, PIXCIR_INT_LEVEL_TOUCH, 0);
324 if (error) {
325 dev_err(dev, "Failed to set interrupt mode: %d\n", error);
326 return error;
327 }
328
329 ts->running = true;
330 mb(); /* Update status before IRQ can fire */
331
332 /* enable interrupt generation */
333 error = pixcir_int_enable(ts, true);
334 if (error) {
335 dev_err(dev, "Failed to enable interrupt generation: %d\n",
336 error);
337 return error;
338 }
339
340 return 0;
341}
342
343static int pixcir_stop(struct pixcir_i2c_ts_data *ts)
344{
345 int error;
346
347 /* Disable interrupt generation */
348 error = pixcir_int_enable(ts, false);
349 if (error) {
350 dev_err(&ts->client->dev,
351 "Failed to disable interrupt generation: %d\n",
352 error);
353 return error;
354 }
355
356 /* Exit ISR if running, no more report parsing */
357 ts->running = false;
358 mb(); /* update status before we synchronize irq */
359
360 /* Wait till running ISR is complete */
361 synchronize_irq(ts->client->irq);
362
363 if (ts->gpio_enable)
364 gpiod_set_value_cansleep(ts->gpio_enable, 0);
365
366 return 0;
367}
368
369static int pixcir_input_open(struct input_dev *dev)
370{
371 struct pixcir_i2c_ts_data *ts = input_get_drvdata(dev);
372
373 return pixcir_start(ts);
374}
375
376static void pixcir_input_close(struct input_dev *dev)
377{
378 struct pixcir_i2c_ts_data *ts = input_get_drvdata(dev);
379
380 pixcir_stop(ts);
381}
382
383static int __maybe_unused pixcir_i2c_ts_suspend(struct device *dev)
384{
385 struct i2c_client *client = to_i2c_client(dev);
386 struct pixcir_i2c_ts_data *ts = i2c_get_clientdata(client);
387 struct input_dev *input = ts->input;
388 int ret = 0;
389
390 mutex_lock(&input->mutex);
391
392 if (device_may_wakeup(&client->dev)) {
393 if (!input->users) {
394 ret = pixcir_start(ts);
395 if (ret) {
396 dev_err(dev, "Failed to start\n");
397 goto unlock;
398 }
399 }
400 } else if (input->users) {
401 ret = pixcir_stop(ts);
402 }
403
404unlock:
405 mutex_unlock(&input->mutex);
406
407 return ret;
408}
409
410static int __maybe_unused pixcir_i2c_ts_resume(struct device *dev)
411{
412 struct i2c_client *client = to_i2c_client(dev);
413 struct pixcir_i2c_ts_data *ts = i2c_get_clientdata(client);
414 struct input_dev *input = ts->input;
415 int ret = 0;
416
417 mutex_lock(&input->mutex);
418
419 if (device_may_wakeup(&client->dev)) {
420
421 if (!input->users) {
422 ret = pixcir_stop(ts);
423 if (ret) {
424 dev_err(dev, "Failed to stop\n");
425 goto unlock;
426 }
427 }
428 } else if (input->users) {
429 ret = pixcir_start(ts);
430 }
431
432unlock:
433 mutex_unlock(&input->mutex);
434
435 return ret;
436}
437
438static SIMPLE_DEV_PM_OPS(pixcir_dev_pm_ops,
439 pixcir_i2c_ts_suspend, pixcir_i2c_ts_resume);
440
441#ifdef CONFIG_OF
442static const struct of_device_id pixcir_of_match[];
443
444static int pixcir_parse_dt(struct device *dev,
445 struct pixcir_i2c_ts_data *tsdata)
446{
447 const struct of_device_id *match;
448
449 match = of_match_device(of_match_ptr(pixcir_of_match), dev);
450 if (!match)
451 return -EINVAL;
452
453 tsdata->chip = (const struct pixcir_i2c_chip_data *)match->data;
454 if (!tsdata->chip)
455 return -EINVAL;
456
457 return 0;
458}
459#else
460static int pixcir_parse_dt(struct device *dev,
461 struct pixcir_i2c_ts_data *tsdata)
462{
463 return -EINVAL;
464}
465#endif
466
467static int pixcir_i2c_ts_probe(struct i2c_client *client,
468 const struct i2c_device_id *id)
469{
470 const struct pixcir_ts_platform_data *pdata =
471 dev_get_platdata(&client->dev);
472 struct device *dev = &client->dev;
473 struct pixcir_i2c_ts_data *tsdata;
474 struct input_dev *input;
475 int error;
476
477 tsdata = devm_kzalloc(dev, sizeof(*tsdata), GFP_KERNEL);
478 if (!tsdata)
479 return -ENOMEM;
480
481 if (pdata) {
482 tsdata->chip = &pdata->chip;
483 } else if (dev->of_node) {
484 error = pixcir_parse_dt(dev, tsdata);
485 if (error)
486 return error;
487 } else {
488 dev_err(&client->dev, "platform data not defined\n");
489 return -EINVAL;
490 }
491
492 if (!tsdata->chip->max_fingers) {
493 dev_err(dev, "Invalid max_fingers in chip data\n");
494 return -EINVAL;
495 }
496
497 input = devm_input_allocate_device(dev);
498 if (!input) {
499 dev_err(dev, "Failed to allocate input device\n");
500 return -ENOMEM;
501 }
502
503 tsdata->client = client;
504 tsdata->input = input;
505
506 input->name = client->name;
507 input->id.bustype = BUS_I2C;
508 input->open = pixcir_input_open;
509 input->close = pixcir_input_close;
510 input->dev.parent = &client->dev;
511
512 if (pdata) {
513 input_set_abs_params(input, ABS_MT_POSITION_X, 0, pdata->x_max, 0, 0);
514 input_set_abs_params(input, ABS_MT_POSITION_Y, 0, pdata->y_max, 0, 0);
515 } else {
516 input_set_capability(input, EV_ABS, ABS_MT_POSITION_X);
517 input_set_capability(input, EV_ABS, ABS_MT_POSITION_Y);
518 touchscreen_parse_properties(input, true);
519 if (!input_abs_get_max(input, ABS_MT_POSITION_X) ||
520 !input_abs_get_max(input, ABS_MT_POSITION_Y)) {
521 dev_err(dev, "Touchscreen size is not specified\n");
522 return -EINVAL;
523 }
524 }
525
526 tsdata->max_fingers = tsdata->chip->max_fingers;
527 if (tsdata->max_fingers > PIXCIR_MAX_SLOTS) {
528 tsdata->max_fingers = PIXCIR_MAX_SLOTS;
529 dev_info(dev, "Limiting maximum fingers to %d\n",
530 tsdata->max_fingers);
531 }
532
533 error = input_mt_init_slots(input, tsdata->max_fingers,
534 INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
535 if (error) {
536 dev_err(dev, "Error initializing Multi-Touch slots\n");
537 return error;
538 }
539
540 input_set_drvdata(input, tsdata);
541
542 tsdata->gpio_attb = devm_gpiod_get(dev, "attb", GPIOD_IN);
543 if (IS_ERR(tsdata->gpio_attb)) {
544 error = PTR_ERR(tsdata->gpio_attb);
545 dev_err(dev, "Failed to request ATTB gpio: %d\n", error);
546 return error;
547 }
548
549 tsdata->gpio_reset = devm_gpiod_get_optional(dev, "reset",
550 GPIOD_OUT_LOW);
551 if (IS_ERR(tsdata->gpio_reset)) {
552 error = PTR_ERR(tsdata->gpio_reset);
553 dev_err(dev, "Failed to request RESET gpio: %d\n", error);
554 return error;
555 }
556
557 tsdata->gpio_wake = devm_gpiod_get_optional(dev, "wake",
558 GPIOD_OUT_HIGH);
559 if (IS_ERR(tsdata->gpio_wake)) {
560 error = PTR_ERR(tsdata->gpio_wake);
561 if (error != -EPROBE_DEFER)
562 dev_err(dev, "Failed to get wake gpio: %d\n", error);
563 return error;
564 }
565
566 tsdata->gpio_enable = devm_gpiod_get_optional(dev, "enable",
567 GPIOD_OUT_HIGH);
568 if (IS_ERR(tsdata->gpio_enable)) {
569 error = PTR_ERR(tsdata->gpio_enable);
570 if (error != -EPROBE_DEFER)
571 dev_err(dev, "Failed to get enable gpio: %d\n", error);
572 return error;
573 }
574
575 if (tsdata->gpio_enable)
576 msleep(100);
577
578 error = devm_request_threaded_irq(dev, client->irq, NULL, pixcir_ts_isr,
579 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
580 client->name, tsdata);
581 if (error) {
582 dev_err(dev, "failed to request irq %d\n", client->irq);
583 return error;
584 }
585
586 pixcir_reset(tsdata);
587
588 /* Always be in IDLE mode to save power, device supports auto wake */
589 error = pixcir_set_power_mode(tsdata, PIXCIR_POWER_IDLE);
590 if (error) {
591 dev_err(dev, "Failed to set IDLE mode\n");
592 return error;
593 }
594
595 /* Stop device till opened */
596 error = pixcir_stop(tsdata);
597 if (error)
598 return error;
599
600 error = input_register_device(input);
601 if (error)
602 return error;
603
604 i2c_set_clientdata(client, tsdata);
605
606 return 0;
607}
608
609static const struct i2c_device_id pixcir_i2c_ts_id[] = {
610 { "pixcir_ts", 0 },
611 { "pixcir_tangoc", 0 },
612 { }
613};
614MODULE_DEVICE_TABLE(i2c, pixcir_i2c_ts_id);
615
616#ifdef CONFIG_OF
617static const struct pixcir_i2c_chip_data pixcir_ts_data = {
618 .max_fingers = 2,
619 /* no hw id support */
620};
621
622static const struct pixcir_i2c_chip_data pixcir_tangoc_data = {
623 .max_fingers = 5,
624 .has_hw_ids = true,
625};
626
627static const struct of_device_id pixcir_of_match[] = {
628 { .compatible = "pixcir,pixcir_ts", .data = &pixcir_ts_data },
629 { .compatible = "pixcir,pixcir_tangoc", .data = &pixcir_tangoc_data },
630 { }
631};
632MODULE_DEVICE_TABLE(of, pixcir_of_match);
633#endif
634
635static struct i2c_driver pixcir_i2c_ts_driver = {
636 .driver = {
637 .name = "pixcir_ts",
638 .pm = &pixcir_dev_pm_ops,
639 .of_match_table = of_match_ptr(pixcir_of_match),
640 },
641 .probe = pixcir_i2c_ts_probe,
642 .id_table = pixcir_i2c_ts_id,
643};
644
645module_i2c_driver(pixcir_i2c_ts_driver);
646
647MODULE_AUTHOR("Jianchun Bian <jcbian@pixcir.com.cn>, Dequan Meng <dqmeng@pixcir.com.cn>");
648MODULE_DESCRIPTION("Pixcir I2C Touchscreen Driver");
649MODULE_LICENSE("GPL");