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path: root/drivers/input/touchscreen/edt-ft5x06.c
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Diffstat (limited to 'drivers/input/touchscreen/edt-ft5x06.c')
-rw-r--r--drivers/input/touchscreen/edt-ft5x06.c898
1 files changed, 898 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/edt-ft5x06.c b/drivers/input/touchscreen/edt-ft5x06.c
new file mode 100644
index 000000000000..9afc777a40a7
--- /dev/null
+++ b/drivers/input/touchscreen/edt-ft5x06.c
@@ -0,0 +1,898 @@
1/*
2 * Copyright (C) 2012 Simon Budig, <simon.budig@kernelconcepts.de>
3 *
4 * This software is licensed under the terms of the GNU General Public
5 * License version 2, as published by the Free Software Foundation, and
6 * may be copied, distributed, and modified under those terms.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public
14 * License along with this library; if not, write to the Free Software
15 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
16 */
17
18/*
19 * This is a driver for the EDT "Polytouch" family of touch controllers
20 * based on the FocalTech FT5x06 line of chips.
21 *
22 * Development of this driver has been sponsored by Glyn:
23 * http://www.glyn.com/Products/Displays
24 */
25
26#include <linux/module.h>
27#include <linux/ratelimit.h>
28#include <linux/interrupt.h>
29#include <linux/input.h>
30#include <linux/i2c.h>
31#include <linux/uaccess.h>
32#include <linux/delay.h>
33#include <linux/debugfs.h>
34#include <linux/slab.h>
35#include <linux/gpio.h>
36#include <linux/input/mt.h>
37#include <linux/input/edt-ft5x06.h>
38
39#define MAX_SUPPORT_POINTS 5
40
41#define WORK_REGISTER_THRESHOLD 0x00
42#define WORK_REGISTER_REPORT_RATE 0x08
43#define WORK_REGISTER_GAIN 0x30
44#define WORK_REGISTER_OFFSET 0x31
45#define WORK_REGISTER_NUM_X 0x33
46#define WORK_REGISTER_NUM_Y 0x34
47
48#define WORK_REGISTER_OPMODE 0x3c
49#define FACTORY_REGISTER_OPMODE 0x01
50
51#define TOUCH_EVENT_DOWN 0x00
52#define TOUCH_EVENT_UP 0x01
53#define TOUCH_EVENT_ON 0x02
54#define TOUCH_EVENT_RESERVED 0x03
55
56#define EDT_NAME_LEN 23
57#define EDT_SWITCH_MODE_RETRIES 10
58#define EDT_SWITCH_MODE_DELAY 5 /* msec */
59#define EDT_RAW_DATA_RETRIES 100
60#define EDT_RAW_DATA_DELAY 1 /* msec */
61
62struct edt_ft5x06_ts_data {
63 struct i2c_client *client;
64 struct input_dev *input;
65 u16 num_x;
66 u16 num_y;
67
68#if defined(CONFIG_DEBUG_FS)
69 struct dentry *debug_dir;
70 u8 *raw_buffer;
71 size_t raw_bufsize;
72#endif
73
74 struct mutex mutex;
75 bool factory_mode;
76 int threshold;
77 int gain;
78 int offset;
79 int report_rate;
80
81 char name[EDT_NAME_LEN];
82};
83
84static int edt_ft5x06_ts_readwrite(struct i2c_client *client,
85 u16 wr_len, u8 *wr_buf,
86 u16 rd_len, u8 *rd_buf)
87{
88 struct i2c_msg wrmsg[2];
89 int i = 0;
90 int ret;
91
92 if (wr_len) {
93 wrmsg[i].addr = client->addr;
94 wrmsg[i].flags = 0;
95 wrmsg[i].len = wr_len;
96 wrmsg[i].buf = wr_buf;
97 i++;
98 }
99 if (rd_len) {
100 wrmsg[i].addr = client->addr;
101 wrmsg[i].flags = I2C_M_RD;
102 wrmsg[i].len = rd_len;
103 wrmsg[i].buf = rd_buf;
104 i++;
105 }
106
107 ret = i2c_transfer(client->adapter, wrmsg, i);
108 if (ret < 0)
109 return ret;
110 if (ret != i)
111 return -EIO;
112
113 return 0;
114}
115
116static bool edt_ft5x06_ts_check_crc(struct edt_ft5x06_ts_data *tsdata,
117 u8 *buf, int buflen)
118{
119 int i;
120 u8 crc = 0;
121
122 for (i = 0; i < buflen - 1; i++)
123 crc ^= buf[i];
124
125 if (crc != buf[buflen-1]) {
126 dev_err_ratelimited(&tsdata->client->dev,
127 "crc error: 0x%02x expected, got 0x%02x\n",
128 crc, buf[buflen-1]);
129 return false;
130 }
131
132 return true;
133}
134
135static irqreturn_t edt_ft5x06_ts_isr(int irq, void *dev_id)
136{
137 struct edt_ft5x06_ts_data *tsdata = dev_id;
138 struct device *dev = &tsdata->client->dev;
139 u8 cmd = 0xf9;
140 u8 rdbuf[26];
141 int i, type, x, y, id;
142 int error;
143
144 memset(rdbuf, 0, sizeof(rdbuf));
145
146 error = edt_ft5x06_ts_readwrite(tsdata->client,
147 sizeof(cmd), &cmd,
148 sizeof(rdbuf), rdbuf);
149 if (error) {
150 dev_err_ratelimited(dev, "Unable to fetch data, error: %d\n",
151 error);
152 goto out;
153 }
154
155 if (rdbuf[0] != 0xaa || rdbuf[1] != 0xaa || rdbuf[2] != 26) {
156 dev_err_ratelimited(dev, "Unexpected header: %02x%02x%02x!\n",
157 rdbuf[0], rdbuf[1], rdbuf[2]);
158 goto out;
159 }
160
161 if (!edt_ft5x06_ts_check_crc(tsdata, rdbuf, 26))
162 goto out;
163
164 for (i = 0; i < MAX_SUPPORT_POINTS; i++) {
165 u8 *buf = &rdbuf[i * 4 + 5];
166 bool down;
167
168 type = buf[0] >> 6;
169 /* ignore Reserved events */
170 if (type == TOUCH_EVENT_RESERVED)
171 continue;
172
173 x = ((buf[0] << 8) | buf[1]) & 0x0fff;
174 y = ((buf[2] << 8) | buf[3]) & 0x0fff;
175 id = (buf[2] >> 4) & 0x0f;
176 down = (type != TOUCH_EVENT_UP);
177
178 input_mt_slot(tsdata->input, id);
179 input_mt_report_slot_state(tsdata->input, MT_TOOL_FINGER, down);
180
181 if (!down)
182 continue;
183
184 input_report_abs(tsdata->input, ABS_MT_POSITION_X, x);
185 input_report_abs(tsdata->input, ABS_MT_POSITION_Y, y);
186 }
187
188 input_mt_report_pointer_emulation(tsdata->input, true);
189 input_sync(tsdata->input);
190
191out:
192 return IRQ_HANDLED;
193}
194
195static int edt_ft5x06_register_write(struct edt_ft5x06_ts_data *tsdata,
196 u8 addr, u8 value)
197{
198 u8 wrbuf[4];
199
200 wrbuf[0] = tsdata->factory_mode ? 0xf3 : 0xfc;
201 wrbuf[1] = tsdata->factory_mode ? addr & 0x7f : addr & 0x3f;
202 wrbuf[2] = value;
203 wrbuf[3] = wrbuf[0] ^ wrbuf[1] ^ wrbuf[2];
204
205 return edt_ft5x06_ts_readwrite(tsdata->client, 4, wrbuf, 0, NULL);
206}
207
208static int edt_ft5x06_register_read(struct edt_ft5x06_ts_data *tsdata,
209 u8 addr)
210{
211 u8 wrbuf[2], rdbuf[2];
212 int error;
213
214 wrbuf[0] = tsdata->factory_mode ? 0xf3 : 0xfc;
215 wrbuf[1] = tsdata->factory_mode ? addr & 0x7f : addr & 0x3f;
216 wrbuf[1] |= tsdata->factory_mode ? 0x80 : 0x40;
217
218 error = edt_ft5x06_ts_readwrite(tsdata->client, 2, wrbuf, 2, rdbuf);
219 if (error)
220 return error;
221
222 if ((wrbuf[0] ^ wrbuf[1] ^ rdbuf[0]) != rdbuf[1]) {
223 dev_err(&tsdata->client->dev,
224 "crc error: 0x%02x expected, got 0x%02x\n",
225 wrbuf[0] ^ wrbuf[1] ^ rdbuf[0], rdbuf[1]);
226 return -EIO;
227 }
228
229 return rdbuf[0];
230}
231
232struct edt_ft5x06_attribute {
233 struct device_attribute dattr;
234 size_t field_offset;
235 u8 limit_low;
236 u8 limit_high;
237 u8 addr;
238};
239
240#define EDT_ATTR(_field, _mode, _addr, _limit_low, _limit_high) \
241 struct edt_ft5x06_attribute edt_ft5x06_attr_##_field = { \
242 .dattr = __ATTR(_field, _mode, \
243 edt_ft5x06_setting_show, \
244 edt_ft5x06_setting_store), \
245 .field_offset = \
246 offsetof(struct edt_ft5x06_ts_data, _field), \
247 .limit_low = _limit_low, \
248 .limit_high = _limit_high, \
249 .addr = _addr, \
250 }
251
252static ssize_t edt_ft5x06_setting_show(struct device *dev,
253 struct device_attribute *dattr,
254 char *buf)
255{
256 struct i2c_client *client = to_i2c_client(dev);
257 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
258 struct edt_ft5x06_attribute *attr =
259 container_of(dattr, struct edt_ft5x06_attribute, dattr);
260 u8 *field = (u8 *)((char *)tsdata + attr->field_offset);
261 int val;
262 size_t count = 0;
263 int error = 0;
264
265 mutex_lock(&tsdata->mutex);
266
267 if (tsdata->factory_mode) {
268 error = -EIO;
269 goto out;
270 }
271
272 val = edt_ft5x06_register_read(tsdata, attr->addr);
273 if (val < 0) {
274 error = val;
275 dev_err(&tsdata->client->dev,
276 "Failed to fetch attribute %s, error %d\n",
277 dattr->attr.name, error);
278 goto out;
279 }
280
281 if (val != *field) {
282 dev_warn(&tsdata->client->dev,
283 "%s: read (%d) and stored value (%d) differ\n",
284 dattr->attr.name, val, *field);
285 *field = val;
286 }
287
288 count = scnprintf(buf, PAGE_SIZE, "%d\n", val);
289out:
290 mutex_unlock(&tsdata->mutex);
291 return error ?: count;
292}
293
294static ssize_t edt_ft5x06_setting_store(struct device *dev,
295 struct device_attribute *dattr,
296 const char *buf, size_t count)
297{
298 struct i2c_client *client = to_i2c_client(dev);
299 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
300 struct edt_ft5x06_attribute *attr =
301 container_of(dattr, struct edt_ft5x06_attribute, dattr);
302 u8 *field = (u8 *)((char *)tsdata + attr->field_offset);
303 unsigned int val;
304 int error;
305
306 mutex_lock(&tsdata->mutex);
307
308 if (tsdata->factory_mode) {
309 error = -EIO;
310 goto out;
311 }
312
313 error = kstrtouint(buf, 0, &val);
314 if (error)
315 goto out;
316
317 if (val < attr->limit_low || val > attr->limit_high) {
318 error = -ERANGE;
319 goto out;
320 }
321
322 error = edt_ft5x06_register_write(tsdata, attr->addr, val);
323 if (error) {
324 dev_err(&tsdata->client->dev,
325 "Failed to update attribute %s, error: %d\n",
326 dattr->attr.name, error);
327 goto out;
328 }
329
330 *field = val;
331
332out:
333 mutex_unlock(&tsdata->mutex);
334 return error ?: count;
335}
336
337static EDT_ATTR(gain, S_IWUSR | S_IRUGO, WORK_REGISTER_GAIN, 0, 31);
338static EDT_ATTR(offset, S_IWUSR | S_IRUGO, WORK_REGISTER_OFFSET, 0, 31);
339static EDT_ATTR(threshold, S_IWUSR | S_IRUGO,
340 WORK_REGISTER_THRESHOLD, 20, 80);
341static EDT_ATTR(report_rate, S_IWUSR | S_IRUGO,
342 WORK_REGISTER_REPORT_RATE, 3, 14);
343
344static struct attribute *edt_ft5x06_attrs[] = {
345 &edt_ft5x06_attr_gain.dattr.attr,
346 &edt_ft5x06_attr_offset.dattr.attr,
347 &edt_ft5x06_attr_threshold.dattr.attr,
348 &edt_ft5x06_attr_report_rate.dattr.attr,
349 NULL
350};
351
352static const struct attribute_group edt_ft5x06_attr_group = {
353 .attrs = edt_ft5x06_attrs,
354};
355
356#ifdef CONFIG_DEBUG_FS
357static int edt_ft5x06_factory_mode(struct edt_ft5x06_ts_data *tsdata)
358{
359 struct i2c_client *client = tsdata->client;
360 int retries = EDT_SWITCH_MODE_RETRIES;
361 int ret;
362 int error;
363
364 disable_irq(client->irq);
365
366 if (!tsdata->raw_buffer) {
367 tsdata->raw_bufsize = tsdata->num_x * tsdata->num_y *
368 sizeof(u16);
369 tsdata->raw_buffer = kzalloc(tsdata->raw_bufsize, GFP_KERNEL);
370 if (!tsdata->raw_buffer) {
371 error = -ENOMEM;
372 goto err_out;
373 }
374 }
375
376 /* mode register is 0x3c when in the work mode */
377 error = edt_ft5x06_register_write(tsdata, WORK_REGISTER_OPMODE, 0x03);
378 if (error) {
379 dev_err(&client->dev,
380 "failed to switch to factory mode, error %d\n", error);
381 goto err_out;
382 }
383
384 tsdata->factory_mode = true;
385 do {
386 mdelay(EDT_SWITCH_MODE_DELAY);
387 /* mode register is 0x01 when in factory mode */
388 ret = edt_ft5x06_register_read(tsdata, FACTORY_REGISTER_OPMODE);
389 if (ret == 0x03)
390 break;
391 } while (--retries > 0);
392
393 if (retries == 0) {
394 dev_err(&client->dev, "not in factory mode after %dms.\n",
395 EDT_SWITCH_MODE_RETRIES * EDT_SWITCH_MODE_DELAY);
396 error = -EIO;
397 goto err_out;
398 }
399
400 return 0;
401
402err_out:
403 kfree(tsdata->raw_buffer);
404 tsdata->raw_buffer = NULL;
405 tsdata->factory_mode = false;
406 enable_irq(client->irq);
407
408 return error;
409}
410
411static int edt_ft5x06_work_mode(struct edt_ft5x06_ts_data *tsdata)
412{
413 struct i2c_client *client = tsdata->client;
414 int retries = EDT_SWITCH_MODE_RETRIES;
415 int ret;
416 int error;
417
418 /* mode register is 0x01 when in the factory mode */
419 error = edt_ft5x06_register_write(tsdata, FACTORY_REGISTER_OPMODE, 0x1);
420 if (error) {
421 dev_err(&client->dev,
422 "failed to switch to work mode, error: %d\n", error);
423 return error;
424 }
425
426 tsdata->factory_mode = false;
427
428 do {
429 mdelay(EDT_SWITCH_MODE_DELAY);
430 /* mode register is 0x01 when in factory mode */
431 ret = edt_ft5x06_register_read(tsdata, WORK_REGISTER_OPMODE);
432 if (ret == 0x01)
433 break;
434 } while (--retries > 0);
435
436 if (retries == 0) {
437 dev_err(&client->dev, "not in work mode after %dms.\n",
438 EDT_SWITCH_MODE_RETRIES * EDT_SWITCH_MODE_DELAY);
439 tsdata->factory_mode = true;
440 return -EIO;
441 }
442
443 if (tsdata->raw_buffer)
444 kfree(tsdata->raw_buffer);
445 tsdata->raw_buffer = NULL;
446
447 /* restore parameters */
448 edt_ft5x06_register_write(tsdata, WORK_REGISTER_THRESHOLD,
449 tsdata->threshold);
450 edt_ft5x06_register_write(tsdata, WORK_REGISTER_GAIN,
451 tsdata->gain);
452 edt_ft5x06_register_write(tsdata, WORK_REGISTER_OFFSET,
453 tsdata->offset);
454 edt_ft5x06_register_write(tsdata, WORK_REGISTER_REPORT_RATE,
455 tsdata->report_rate);
456
457 enable_irq(client->irq);
458
459 return 0;
460}
461
462static int edt_ft5x06_debugfs_mode_get(void *data, u64 *mode)
463{
464 struct edt_ft5x06_ts_data *tsdata = data;
465
466 *mode = tsdata->factory_mode;
467
468 return 0;
469};
470
471static int edt_ft5x06_debugfs_mode_set(void *data, u64 mode)
472{
473 struct edt_ft5x06_ts_data *tsdata = data;
474 int retval = 0;
475
476 if (mode > 1)
477 return -ERANGE;
478
479 mutex_lock(&tsdata->mutex);
480
481 if (mode != tsdata->factory_mode) {
482 retval = mode ? edt_ft5x06_factory_mode(tsdata) :
483 edt_ft5x06_work_mode(tsdata);
484 }
485
486 mutex_unlock(&tsdata->mutex);
487
488 return retval;
489};
490
491DEFINE_SIMPLE_ATTRIBUTE(debugfs_mode_fops, edt_ft5x06_debugfs_mode_get,
492 edt_ft5x06_debugfs_mode_set, "%llu\n");
493
494static int edt_ft5x06_debugfs_raw_data_open(struct inode *inode,
495 struct file *file)
496{
497 file->private_data = inode->i_private;
498
499 return 0;
500}
501
502static ssize_t edt_ft5x06_debugfs_raw_data_read(struct file *file,
503 char __user *buf, size_t count, loff_t *off)
504{
505 struct edt_ft5x06_ts_data *tsdata = file->private_data;
506 struct i2c_client *client = tsdata->client;
507 int retries = EDT_RAW_DATA_RETRIES;
508 int val, i, error;
509 size_t read = 0;
510 int colbytes;
511 char wrbuf[3];
512 u8 *rdbuf;
513
514 if (*off < 0 || *off >= tsdata->raw_bufsize)
515 return 0;
516
517 mutex_lock(&tsdata->mutex);
518
519 if (!tsdata->factory_mode || !tsdata->raw_buffer) {
520 error = -EIO;
521 goto out;
522 }
523
524 error = edt_ft5x06_register_write(tsdata, 0x08, 0x01);
525 if (error) {
526 dev_dbg(&client->dev,
527 "failed to write 0x08 register, error %d\n", error);
528 goto out;
529 }
530
531 do {
532 msleep(EDT_RAW_DATA_DELAY);
533 val = edt_ft5x06_register_read(tsdata, 0x08);
534 if (val < 1)
535 break;
536 } while (--retries > 0);
537
538 if (val < 0) {
539 error = val;
540 dev_dbg(&client->dev,
541 "failed to read 0x08 register, error %d\n", error);
542 goto out;
543 }
544
545 if (retries == 0) {
546 dev_dbg(&client->dev,
547 "timed out waiting for register to settle\n");
548 error = -ETIMEDOUT;
549 goto out;
550 }
551
552 rdbuf = tsdata->raw_buffer;
553 colbytes = tsdata->num_y * sizeof(u16);
554
555 wrbuf[0] = 0xf5;
556 wrbuf[1] = 0x0e;
557 for (i = 0; i < tsdata->num_x; i++) {
558 wrbuf[2] = i; /* column index */
559 error = edt_ft5x06_ts_readwrite(tsdata->client,
560 sizeof(wrbuf), wrbuf,
561 colbytes, rdbuf);
562 if (error)
563 goto out;
564
565 rdbuf += colbytes;
566 }
567
568 read = min_t(size_t, count, tsdata->raw_bufsize - *off);
569 error = copy_to_user(buf, tsdata->raw_buffer + *off, read);
570 if (!error)
571 *off += read;
572out:
573 mutex_unlock(&tsdata->mutex);
574 return error ?: read;
575};
576
577
578static const struct file_operations debugfs_raw_data_fops = {
579 .open = edt_ft5x06_debugfs_raw_data_open,
580 .read = edt_ft5x06_debugfs_raw_data_read,
581};
582
583static void __devinit
584edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata,
585 const char *debugfs_name)
586{
587 tsdata->debug_dir = debugfs_create_dir(debugfs_name, NULL);
588 if (!tsdata->debug_dir)
589 return;
590
591 debugfs_create_u16("num_x", S_IRUSR, tsdata->debug_dir, &tsdata->num_x);
592 debugfs_create_u16("num_y", S_IRUSR, tsdata->debug_dir, &tsdata->num_y);
593
594 debugfs_create_file("mode", S_IRUSR | S_IWUSR,
595 tsdata->debug_dir, tsdata, &debugfs_mode_fops);
596 debugfs_create_file("raw_data", S_IRUSR,
597 tsdata->debug_dir, tsdata, &debugfs_raw_data_fops);
598}
599
600static void __devexit
601edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
602{
603 if (tsdata->debug_dir)
604 debugfs_remove_recursive(tsdata->debug_dir);
605}
606
607#else
608
609static inline void
610edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata,
611 const char *debugfs_name)
612{
613}
614
615static inline void
616edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
617{
618}
619
620#endif /* CONFIG_DEBUGFS */
621
622
623
624static int __devinit edt_ft5x06_ts_reset(struct i2c_client *client,
625 int reset_pin)
626{
627 int error;
628
629 if (gpio_is_valid(reset_pin)) {
630 /* this pulls reset down, enabling the low active reset */
631 error = gpio_request_one(reset_pin, GPIOF_OUT_INIT_LOW,
632 "edt-ft5x06 reset");
633 if (error) {
634 dev_err(&client->dev,
635 "Failed to request GPIO %d as reset pin, error %d\n",
636 reset_pin, error);
637 return error;
638 }
639
640 mdelay(50);
641 gpio_set_value(reset_pin, 1);
642 mdelay(100);
643 }
644
645 return 0;
646}
647
648static int __devinit edt_ft5x06_ts_identify(struct i2c_client *client,
649 char *model_name,
650 char *fw_version)
651{
652 u8 rdbuf[EDT_NAME_LEN];
653 char *p;
654 int error;
655
656 error = edt_ft5x06_ts_readwrite(client, 1, "\xbb",
657 EDT_NAME_LEN - 1, rdbuf);
658 if (error)
659 return error;
660
661 /* remove last '$' end marker */
662 rdbuf[EDT_NAME_LEN - 1] = '\0';
663 if (rdbuf[EDT_NAME_LEN - 2] == '$')
664 rdbuf[EDT_NAME_LEN - 2] = '\0';
665
666 /* look for Model/Version separator */
667 p = strchr(rdbuf, '*');
668 if (p)
669 *p++ = '\0';
670
671 strlcpy(model_name, rdbuf + 1, EDT_NAME_LEN);
672 strlcpy(fw_version, p ? p : "", EDT_NAME_LEN);
673
674 return 0;
675}
676
677#define EDT_ATTR_CHECKSET(name, reg) \
678 if (pdata->name >= edt_ft5x06_attr_##name.limit_low && \
679 pdata->name <= edt_ft5x06_attr_##name.limit_high) \
680 edt_ft5x06_register_write(tsdata, reg, pdata->name)
681
682static void __devinit
683edt_ft5x06_ts_get_defaults(struct edt_ft5x06_ts_data *tsdata,
684 const struct edt_ft5x06_platform_data *pdata)
685{
686 if (!pdata->use_parameters)
687 return;
688
689 /* pick up defaults from the platform data */
690 EDT_ATTR_CHECKSET(threshold, WORK_REGISTER_THRESHOLD);
691 EDT_ATTR_CHECKSET(gain, WORK_REGISTER_GAIN);
692 EDT_ATTR_CHECKSET(offset, WORK_REGISTER_OFFSET);
693 EDT_ATTR_CHECKSET(report_rate, WORK_REGISTER_REPORT_RATE);
694}
695
696static void __devinit
697edt_ft5x06_ts_get_parameters(struct edt_ft5x06_ts_data *tsdata)
698{
699 tsdata->threshold = edt_ft5x06_register_read(tsdata,
700 WORK_REGISTER_THRESHOLD);
701 tsdata->gain = edt_ft5x06_register_read(tsdata, WORK_REGISTER_GAIN);
702 tsdata->offset = edt_ft5x06_register_read(tsdata, WORK_REGISTER_OFFSET);
703 tsdata->report_rate = edt_ft5x06_register_read(tsdata,
704 WORK_REGISTER_REPORT_RATE);
705 tsdata->num_x = edt_ft5x06_register_read(tsdata, WORK_REGISTER_NUM_X);
706 tsdata->num_y = edt_ft5x06_register_read(tsdata, WORK_REGISTER_NUM_Y);
707}
708
709static int __devinit edt_ft5x06_ts_probe(struct i2c_client *client,
710 const struct i2c_device_id *id)
711{
712 const struct edt_ft5x06_platform_data *pdata =
713 client->dev.platform_data;
714 struct edt_ft5x06_ts_data *tsdata;
715 struct input_dev *input;
716 int error;
717 char fw_version[EDT_NAME_LEN];
718
719 dev_dbg(&client->dev, "probing for EDT FT5x06 I2C\n");
720
721 if (!pdata) {
722 dev_err(&client->dev, "no platform data?\n");
723 return -EINVAL;
724 }
725
726 error = edt_ft5x06_ts_reset(client, pdata->reset_pin);
727 if (error)
728 return error;
729
730 if (gpio_is_valid(pdata->irq_pin)) {
731 error = gpio_request_one(pdata->irq_pin,
732 GPIOF_IN, "edt-ft5x06 irq");
733 if (error) {
734 dev_err(&client->dev,
735 "Failed to request GPIO %d, error %d\n",
736 pdata->irq_pin, error);
737 return error;
738 }
739 }
740
741 tsdata = kzalloc(sizeof(*tsdata), GFP_KERNEL);
742 input = input_allocate_device();
743 if (!tsdata || !input) {
744 dev_err(&client->dev, "failed to allocate driver data.\n");
745 error = -ENOMEM;
746 goto err_free_mem;
747 }
748
749 mutex_init(&tsdata->mutex);
750 tsdata->client = client;
751 tsdata->input = input;
752 tsdata->factory_mode = false;
753
754 error = edt_ft5x06_ts_identify(client, tsdata->name, fw_version);
755 if (error) {
756 dev_err(&client->dev, "touchscreen probe failed\n");
757 goto err_free_mem;
758 }
759
760 edt_ft5x06_ts_get_defaults(tsdata, pdata);
761 edt_ft5x06_ts_get_parameters(tsdata);
762
763 dev_dbg(&client->dev,
764 "Model \"%s\", Rev. \"%s\", %dx%d sensors\n",
765 tsdata->name, fw_version, tsdata->num_x, tsdata->num_y);
766
767 input->name = tsdata->name;
768 input->id.bustype = BUS_I2C;
769 input->dev.parent = &client->dev;
770
771 __set_bit(EV_SYN, input->evbit);
772 __set_bit(EV_KEY, input->evbit);
773 __set_bit(EV_ABS, input->evbit);
774 __set_bit(BTN_TOUCH, input->keybit);
775 input_set_abs_params(input, ABS_X, 0, tsdata->num_x * 64 - 1, 0, 0);
776 input_set_abs_params(input, ABS_Y, 0, tsdata->num_y * 64 - 1, 0, 0);
777 input_set_abs_params(input, ABS_MT_POSITION_X,
778 0, tsdata->num_x * 64 - 1, 0, 0);
779 input_set_abs_params(input, ABS_MT_POSITION_Y,
780 0, tsdata->num_y * 64 - 1, 0, 0);
781 error = input_mt_init_slots(input, MAX_SUPPORT_POINTS);
782 if (error) {
783 dev_err(&client->dev, "Unable to init MT slots.\n");
784 goto err_free_mem;
785 }
786
787 input_set_drvdata(input, tsdata);
788 i2c_set_clientdata(client, tsdata);
789
790 error = request_threaded_irq(client->irq, NULL, edt_ft5x06_ts_isr,
791 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
792 client->name, tsdata);
793 if (error) {
794 dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
795 goto err_free_mem;
796 }
797
798 error = sysfs_create_group(&client->dev.kobj, &edt_ft5x06_attr_group);
799 if (error)
800 goto err_free_irq;
801
802 error = input_register_device(input);
803 if (error)
804 goto err_remove_attrs;
805
806 edt_ft5x06_ts_prepare_debugfs(tsdata, dev_driver_string(&client->dev));
807 device_init_wakeup(&client->dev, 1);
808
809 dev_dbg(&client->dev,
810 "EDT FT5x06 initialized: IRQ pin %d, Reset pin %d.\n",
811 pdata->irq_pin, pdata->reset_pin);
812
813 return 0;
814
815err_remove_attrs:
816 sysfs_remove_group(&client->dev.kobj, &edt_ft5x06_attr_group);
817err_free_irq:
818 free_irq(client->irq, tsdata);
819err_free_mem:
820 input_free_device(input);
821 kfree(tsdata);
822
823 if (gpio_is_valid(pdata->irq_pin))
824 gpio_free(pdata->irq_pin);
825
826 return error;
827}
828
829static int __devexit edt_ft5x06_ts_remove(struct i2c_client *client)
830{
831 const struct edt_ft5x06_platform_data *pdata =
832 dev_get_platdata(&client->dev);
833 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
834
835 edt_ft5x06_ts_teardown_debugfs(tsdata);
836 sysfs_remove_group(&client->dev.kobj, &edt_ft5x06_attr_group);
837
838 free_irq(client->irq, tsdata);
839 input_unregister_device(tsdata->input);
840
841 if (gpio_is_valid(pdata->irq_pin))
842 gpio_free(pdata->irq_pin);
843 if (gpio_is_valid(pdata->reset_pin))
844 gpio_free(pdata->reset_pin);
845
846 kfree(tsdata->raw_buffer);
847 kfree(tsdata);
848
849 return 0;
850}
851
852#ifdef CONFIG_PM_SLEEP
853static int edt_ft5x06_ts_suspend(struct device *dev)
854{
855 struct i2c_client *client = to_i2c_client(dev);
856
857 if (device_may_wakeup(dev))
858 enable_irq_wake(client->irq);
859
860 return 0;
861}
862
863static int edt_ft5x06_ts_resume(struct device *dev)
864{
865 struct i2c_client *client = to_i2c_client(dev);
866
867 if (device_may_wakeup(dev))
868 disable_irq_wake(client->irq);
869
870 return 0;
871}
872#endif
873
874static SIMPLE_DEV_PM_OPS(edt_ft5x06_ts_pm_ops,
875 edt_ft5x06_ts_suspend, edt_ft5x06_ts_resume);
876
877static const struct i2c_device_id edt_ft5x06_ts_id[] = {
878 { "edt-ft5x06", 0 },
879 { }
880};
881MODULE_DEVICE_TABLE(i2c, edt_ft5x06_ts_id);
882
883static struct i2c_driver edt_ft5x06_ts_driver = {
884 .driver = {
885 .owner = THIS_MODULE,
886 .name = "edt_ft5x06",
887 .pm = &edt_ft5x06_ts_pm_ops,
888 },
889 .id_table = edt_ft5x06_ts_id,
890 .probe = edt_ft5x06_ts_probe,
891 .remove = __devexit_p(edt_ft5x06_ts_remove),
892};
893
894module_i2c_driver(edt_ft5x06_ts_driver);
895
896MODULE_AUTHOR("Simon Budig <simon.budig@kernelconcepts.de>");
897MODULE_DESCRIPTION("EDT FT5x06 I2C Touchscreen Driver");
898MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-04 10:00:09 -0500