Version:  2.0.40 2.2.26 2.4.37 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10

Linux/drivers/input/touchscreen/edt-ft5x06.c

  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 
 62 struct 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 
 84 static 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 
116 static 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 
135 static 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 
191 out:
192         return IRQ_HANDLED;
193 }
194 
195 static 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 
208 static 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 
232 struct 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 
252 static 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);
289 out:
290         mutex_unlock(&tsdata->mutex);
291         return error ?: count;
292 }
293 
294 static 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 
332 out:
333         mutex_unlock(&tsdata->mutex);
334         return error ?: count;
335 }
336 
337 static EDT_ATTR(gain, S_IWUSR | S_IRUGO, WORK_REGISTER_GAIN, 0, 31);
338 static EDT_ATTR(offset, S_IWUSR | S_IRUGO, WORK_REGISTER_OFFSET, 0, 31);
339 static EDT_ATTR(threshold, S_IWUSR | S_IRUGO,
340                 WORK_REGISTER_THRESHOLD, 20, 80);
341 static EDT_ATTR(report_rate, S_IWUSR | S_IRUGO,
342                 WORK_REGISTER_REPORT_RATE, 3, 14);
343 
344 static 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 
352 static const struct attribute_group edt_ft5x06_attr_group = {
353         .attrs = edt_ft5x06_attrs,
354 };
355 
356 #ifdef CONFIG_DEBUG_FS
357 static 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 
402 err_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 
411 static 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         kfree(tsdata->raw_buffer);
444         tsdata->raw_buffer = NULL;
445 
446         /* restore parameters */
447         edt_ft5x06_register_write(tsdata, WORK_REGISTER_THRESHOLD,
448                                   tsdata->threshold);
449         edt_ft5x06_register_write(tsdata, WORK_REGISTER_GAIN,
450                                   tsdata->gain);
451         edt_ft5x06_register_write(tsdata, WORK_REGISTER_OFFSET,
452                                   tsdata->offset);
453         edt_ft5x06_register_write(tsdata, WORK_REGISTER_REPORT_RATE,
454                                   tsdata->report_rate);
455 
456         enable_irq(client->irq);
457 
458         return 0;
459 }
460 
461 static int edt_ft5x06_debugfs_mode_get(void *data, u64 *mode)
462 {
463         struct edt_ft5x06_ts_data *tsdata = data;
464 
465         *mode = tsdata->factory_mode;
466 
467         return 0;
468 };
469 
470 static int edt_ft5x06_debugfs_mode_set(void *data, u64 mode)
471 {
472         struct edt_ft5x06_ts_data *tsdata = data;
473         int retval = 0;
474 
475         if (mode > 1)
476                 return -ERANGE;
477 
478         mutex_lock(&tsdata->mutex);
479 
480         if (mode != tsdata->factory_mode) {
481                 retval = mode ? edt_ft5x06_factory_mode(tsdata) :
482                                 edt_ft5x06_work_mode(tsdata);
483         }
484 
485         mutex_unlock(&tsdata->mutex);
486 
487         return retval;
488 };
489 
490 DEFINE_SIMPLE_ATTRIBUTE(debugfs_mode_fops, edt_ft5x06_debugfs_mode_get,
491                         edt_ft5x06_debugfs_mode_set, "%llu\n");
492 
493 static ssize_t edt_ft5x06_debugfs_raw_data_read(struct file *file,
494                                 char __user *buf, size_t count, loff_t *off)
495 {
496         struct edt_ft5x06_ts_data *tsdata = file->private_data;
497         struct i2c_client *client = tsdata->client;
498         int retries  = EDT_RAW_DATA_RETRIES;
499         int val, i, error;
500         size_t read = 0;
501         int colbytes;
502         char wrbuf[3];
503         u8 *rdbuf;
504 
505         if (*off < 0 || *off >= tsdata->raw_bufsize)
506                 return 0;
507 
508         mutex_lock(&tsdata->mutex);
509 
510         if (!tsdata->factory_mode || !tsdata->raw_buffer) {
511                 error = -EIO;
512                 goto out;
513         }
514 
515         error = edt_ft5x06_register_write(tsdata, 0x08, 0x01);
516         if (error) {
517                 dev_dbg(&client->dev,
518                         "failed to write 0x08 register, error %d\n", error);
519                 goto out;
520         }
521 
522         do {
523                 msleep(EDT_RAW_DATA_DELAY);
524                 val = edt_ft5x06_register_read(tsdata, 0x08);
525                 if (val < 1)
526                         break;
527         } while (--retries > 0);
528 
529         if (val < 0) {
530                 error = val;
531                 dev_dbg(&client->dev,
532                         "failed to read 0x08 register, error %d\n", error);
533                 goto out;
534         }
535 
536         if (retries == 0) {
537                 dev_dbg(&client->dev,
538                         "timed out waiting for register to settle\n");
539                 error = -ETIMEDOUT;
540                 goto out;
541         }
542 
543         rdbuf = tsdata->raw_buffer;
544         colbytes = tsdata->num_y * sizeof(u16);
545 
546         wrbuf[0] = 0xf5;
547         wrbuf[1] = 0x0e;
548         for (i = 0; i < tsdata->num_x; i++) {
549                 wrbuf[2] = i;  /* column index */
550                 error = edt_ft5x06_ts_readwrite(tsdata->client,
551                                                 sizeof(wrbuf), wrbuf,
552                                                 colbytes, rdbuf);
553                 if (error)
554                         goto out;
555 
556                 rdbuf += colbytes;
557         }
558 
559         read = min_t(size_t, count, tsdata->raw_bufsize - *off);
560         if (copy_to_user(buf, tsdata->raw_buffer + *off, read)) {
561                 error = -EFAULT;
562                 goto out;
563         }
564 
565         *off += read;
566 out:
567         mutex_unlock(&tsdata->mutex);
568         return error ?: read;
569 };
570 
571 
572 static const struct file_operations debugfs_raw_data_fops = {
573         .open = simple_open,
574         .read = edt_ft5x06_debugfs_raw_data_read,
575 };
576 
577 static void
578 edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata,
579                               const char *debugfs_name)
580 {
581         tsdata->debug_dir = debugfs_create_dir(debugfs_name, NULL);
582         if (!tsdata->debug_dir)
583                 return;
584 
585         debugfs_create_u16("num_x", S_IRUSR, tsdata->debug_dir, &tsdata->num_x);
586         debugfs_create_u16("num_y", S_IRUSR, tsdata->debug_dir, &tsdata->num_y);
587 
588         debugfs_create_file("mode", S_IRUSR | S_IWUSR,
589                             tsdata->debug_dir, tsdata, &debugfs_mode_fops);
590         debugfs_create_file("raw_data", S_IRUSR,
591                             tsdata->debug_dir, tsdata, &debugfs_raw_data_fops);
592 }
593 
594 static void
595 edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
596 {
597         if (tsdata->debug_dir)
598                 debugfs_remove_recursive(tsdata->debug_dir);
599         kfree(tsdata->raw_buffer);
600 }
601 
602 #else
603 
604 static inline void
605 edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata,
606                               const char *debugfs_name)
607 {
608 }
609 
610 static inline void
611 edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
612 {
613 }
614 
615 #endif /* CONFIG_DEBUGFS */
616 
617 
618 
619 static int edt_ft5x06_ts_reset(struct i2c_client *client,
620                                          int reset_pin)
621 {
622         int error;
623 
624         if (gpio_is_valid(reset_pin)) {
625                 /* this pulls reset down, enabling the low active reset */
626                 error = gpio_request_one(reset_pin, GPIOF_OUT_INIT_LOW,
627                                          "edt-ft5x06 reset");
628                 if (error) {
629                         dev_err(&client->dev,
630                                 "Failed to request GPIO %d as reset pin, error %d\n",
631                                 reset_pin, error);
632                         return error;
633                 }
634 
635                 mdelay(50);
636                 gpio_set_value(reset_pin, 1);
637                 mdelay(100);
638         }
639 
640         return 0;
641 }
642 
643 static int edt_ft5x06_ts_identify(struct i2c_client *client,
644                                             char *model_name,
645                                             char *fw_version)
646 {
647         u8 rdbuf[EDT_NAME_LEN];
648         char *p;
649         int error;
650 
651         error = edt_ft5x06_ts_readwrite(client, 1, "\xbb",
652                                         EDT_NAME_LEN - 1, rdbuf);
653         if (error)
654                 return error;
655 
656         /* remove last '$' end marker */
657         rdbuf[EDT_NAME_LEN - 1] = '\0';
658         if (rdbuf[EDT_NAME_LEN - 2] == '$')
659                 rdbuf[EDT_NAME_LEN - 2] = '\0';
660 
661         /* look for Model/Version separator */
662         p = strchr(rdbuf, '*');
663         if (p)
664                 *p++ = '\0';
665 
666         strlcpy(model_name, rdbuf + 1, EDT_NAME_LEN);
667         strlcpy(fw_version, p ? p : "", EDT_NAME_LEN);
668 
669         return 0;
670 }
671 
672 #define EDT_ATTR_CHECKSET(name, reg) \
673         if (pdata->name >= edt_ft5x06_attr_##name.limit_low &&          \
674             pdata->name <= edt_ft5x06_attr_##name.limit_high)           \
675                 edt_ft5x06_register_write(tsdata, reg, pdata->name)
676 
677 static void
678 edt_ft5x06_ts_get_defaults(struct edt_ft5x06_ts_data *tsdata,
679                            const struct edt_ft5x06_platform_data *pdata)
680 {
681         if (!pdata->use_parameters)
682                 return;
683 
684         /* pick up defaults from the platform data */
685         EDT_ATTR_CHECKSET(threshold, WORK_REGISTER_THRESHOLD);
686         EDT_ATTR_CHECKSET(gain, WORK_REGISTER_GAIN);
687         EDT_ATTR_CHECKSET(offset, WORK_REGISTER_OFFSET);
688         EDT_ATTR_CHECKSET(report_rate, WORK_REGISTER_REPORT_RATE);
689 }
690 
691 static void
692 edt_ft5x06_ts_get_parameters(struct edt_ft5x06_ts_data *tsdata)
693 {
694         tsdata->threshold = edt_ft5x06_register_read(tsdata,
695                                                      WORK_REGISTER_THRESHOLD);
696         tsdata->gain = edt_ft5x06_register_read(tsdata, WORK_REGISTER_GAIN);
697         tsdata->offset = edt_ft5x06_register_read(tsdata, WORK_REGISTER_OFFSET);
698         tsdata->report_rate = edt_ft5x06_register_read(tsdata,
699                                                 WORK_REGISTER_REPORT_RATE);
700         tsdata->num_x = edt_ft5x06_register_read(tsdata, WORK_REGISTER_NUM_X);
701         tsdata->num_y = edt_ft5x06_register_read(tsdata, WORK_REGISTER_NUM_Y);
702 }
703 
704 static int edt_ft5x06_ts_probe(struct i2c_client *client,
705                                          const struct i2c_device_id *id)
706 {
707         const struct edt_ft5x06_platform_data *pdata =
708                                                 client->dev.platform_data;
709         struct edt_ft5x06_ts_data *tsdata;
710         struct input_dev *input;
711         int error;
712         char fw_version[EDT_NAME_LEN];
713 
714         dev_dbg(&client->dev, "probing for EDT FT5x06 I2C\n");
715 
716         if (!pdata) {
717                 dev_err(&client->dev, "no platform data?\n");
718                 return -EINVAL;
719         }
720 
721         error = edt_ft5x06_ts_reset(client, pdata->reset_pin);
722         if (error)
723                 return error;
724 
725         if (gpio_is_valid(pdata->irq_pin)) {
726                 error = gpio_request_one(pdata->irq_pin,
727                                          GPIOF_IN, "edt-ft5x06 irq");
728                 if (error) {
729                         dev_err(&client->dev,
730                                 "Failed to request GPIO %d, error %d\n",
731                                 pdata->irq_pin, error);
732                         return error;
733                 }
734         }
735 
736         tsdata = kzalloc(sizeof(*tsdata), GFP_KERNEL);
737         input = input_allocate_device();
738         if (!tsdata || !input) {
739                 dev_err(&client->dev, "failed to allocate driver data.\n");
740                 error = -ENOMEM;
741                 goto err_free_mem;
742         }
743 
744         mutex_init(&tsdata->mutex);
745         tsdata->client = client;
746         tsdata->input = input;
747         tsdata->factory_mode = false;
748 
749         error = edt_ft5x06_ts_identify(client, tsdata->name, fw_version);
750         if (error) {
751                 dev_err(&client->dev, "touchscreen probe failed\n");
752                 goto err_free_mem;
753         }
754 
755         edt_ft5x06_ts_get_defaults(tsdata, pdata);
756         edt_ft5x06_ts_get_parameters(tsdata);
757 
758         dev_dbg(&client->dev,
759                 "Model \"%s\", Rev. \"%s\", %dx%d sensors\n",
760                 tsdata->name, fw_version, tsdata->num_x, tsdata->num_y);
761 
762         input->name = tsdata->name;
763         input->id.bustype = BUS_I2C;
764         input->dev.parent = &client->dev;
765 
766         __set_bit(EV_SYN, input->evbit);
767         __set_bit(EV_KEY, input->evbit);
768         __set_bit(EV_ABS, input->evbit);
769         __set_bit(BTN_TOUCH, input->keybit);
770         input_set_abs_params(input, ABS_X, 0, tsdata->num_x * 64 - 1, 0, 0);
771         input_set_abs_params(input, ABS_Y, 0, tsdata->num_y * 64 - 1, 0, 0);
772         input_set_abs_params(input, ABS_MT_POSITION_X,
773                              0, tsdata->num_x * 64 - 1, 0, 0);
774         input_set_abs_params(input, ABS_MT_POSITION_Y,
775                              0, tsdata->num_y * 64 - 1, 0, 0);
776         error = input_mt_init_slots(input, MAX_SUPPORT_POINTS, 0);
777         if (error) {
778                 dev_err(&client->dev, "Unable to init MT slots.\n");
779                 goto err_free_mem;
780         }
781 
782         input_set_drvdata(input, tsdata);
783         i2c_set_clientdata(client, tsdata);
784 
785         error = request_threaded_irq(client->irq, NULL, edt_ft5x06_ts_isr,
786                                      IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
787                                      client->name, tsdata);
788         if (error) {
789                 dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
790                 goto err_free_mem;
791         }
792 
793         error = sysfs_create_group(&client->dev.kobj, &edt_ft5x06_attr_group);
794         if (error)
795                 goto err_free_irq;
796 
797         error = input_register_device(input);
798         if (error)
799                 goto err_remove_attrs;
800 
801         edt_ft5x06_ts_prepare_debugfs(tsdata, dev_driver_string(&client->dev));
802         device_init_wakeup(&client->dev, 1);
803 
804         dev_dbg(&client->dev,
805                 "EDT FT5x06 initialized: IRQ pin %d, Reset pin %d.\n",
806                 pdata->irq_pin, pdata->reset_pin);
807 
808         return 0;
809 
810 err_remove_attrs:
811         sysfs_remove_group(&client->dev.kobj, &edt_ft5x06_attr_group);
812 err_free_irq:
813         free_irq(client->irq, tsdata);
814 err_free_mem:
815         input_free_device(input);
816         kfree(tsdata);
817 
818         if (gpio_is_valid(pdata->irq_pin))
819                 gpio_free(pdata->irq_pin);
820 
821         return error;
822 }
823 
824 static int edt_ft5x06_ts_remove(struct i2c_client *client)
825 {
826         const struct edt_ft5x06_platform_data *pdata =
827                                                 dev_get_platdata(&client->dev);
828         struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
829 
830         edt_ft5x06_ts_teardown_debugfs(tsdata);
831         sysfs_remove_group(&client->dev.kobj, &edt_ft5x06_attr_group);
832 
833         free_irq(client->irq, tsdata);
834         input_unregister_device(tsdata->input);
835 
836         if (gpio_is_valid(pdata->irq_pin))
837                 gpio_free(pdata->irq_pin);
838         if (gpio_is_valid(pdata->reset_pin))
839                 gpio_free(pdata->reset_pin);
840 
841         kfree(tsdata);
842 
843         return 0;
844 }
845 
846 #ifdef CONFIG_PM_SLEEP
847 static int edt_ft5x06_ts_suspend(struct device *dev)
848 {
849         struct i2c_client *client = to_i2c_client(dev);
850 
851         if (device_may_wakeup(dev))
852                 enable_irq_wake(client->irq);
853 
854         return 0;
855 }
856 
857 static int edt_ft5x06_ts_resume(struct device *dev)
858 {
859         struct i2c_client *client = to_i2c_client(dev);
860 
861         if (device_may_wakeup(dev))
862                 disable_irq_wake(client->irq);
863 
864         return 0;
865 }
866 #endif
867 
868 static SIMPLE_DEV_PM_OPS(edt_ft5x06_ts_pm_ops,
869                          edt_ft5x06_ts_suspend, edt_ft5x06_ts_resume);
870 
871 static const struct i2c_device_id edt_ft5x06_ts_id[] = {
872         { "edt-ft5x06", 0 },
873         { }
874 };
875 MODULE_DEVICE_TABLE(i2c, edt_ft5x06_ts_id);
876 
877 static struct i2c_driver edt_ft5x06_ts_driver = {
878         .driver = {
879                 .owner = THIS_MODULE,
880                 .name = "edt_ft5x06",
881                 .pm = &edt_ft5x06_ts_pm_ops,
882         },
883         .id_table = edt_ft5x06_ts_id,
884         .probe    = edt_ft5x06_ts_probe,
885         .remove   = edt_ft5x06_ts_remove,
886 };
887 
888 module_i2c_driver(edt_ft5x06_ts_driver);
889 
890 MODULE_AUTHOR("Simon Budig <simon.budig@kernelconcepts.de>");
891 MODULE_DESCRIPTION("EDT FT5x06 I2C Touchscreen Driver");
892 MODULE_LICENSE("GPL");
893 

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