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43c4d13e SB |
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 | 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 | ||
462 | static 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 | ||
471 | static 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 | ||
491 | DEFINE_SIMPLE_ATTRIBUTE(debugfs_mode_fops, edt_ft5x06_debugfs_mode_get, | |
492 | edt_ft5x06_debugfs_mode_set, "%llu\n"); | |
493 | ||
494 | static 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 | ||
502 | static 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; | |
572 | out: | |
573 | mutex_unlock(&tsdata->mutex); | |
574 | return error ?: read; | |
575 | }; | |
576 | ||
577 | ||
578 | static 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 | ||
583 | static void __devinit | |
584 | edt_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 | ||
600 | static void __devexit | |
601 | edt_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 | ||
609 | static inline void | |
610 | edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata, | |
611 | const char *debugfs_name) | |
612 | { | |
613 | } | |
614 | ||
615 | static inline void | |
616 | edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata) | |
617 | { | |
618 | } | |
619 | ||
620 | #endif /* CONFIG_DEBUGFS */ | |
621 | ||
622 | ||
623 | ||
624 | static 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 | ||
648 | static 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 | ||
682 | static void __devinit | |
683 | edt_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 | ||
696 | static void __devinit | |
697 | edt_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 | ||
709 | static 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 | ||
815 | err_remove_attrs: | |
816 | sysfs_remove_group(&client->dev.kobj, &edt_ft5x06_attr_group); | |
817 | err_free_irq: | |
818 | free_irq(client->irq, tsdata); | |
819 | err_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 | ||
829 | static 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 | |
853 | static 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 | ||
863 | static 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 | ||
874 | static SIMPLE_DEV_PM_OPS(edt_ft5x06_ts_pm_ops, | |
875 | edt_ft5x06_ts_suspend, edt_ft5x06_ts_resume); | |
876 | ||
877 | static const struct i2c_device_id edt_ft5x06_ts_id[] = { | |
878 | { "edt-ft5x06", 0 }, | |
879 | { } | |
880 | }; | |
881 | MODULE_DEVICE_TABLE(i2c, edt_ft5x06_ts_id); | |
882 | ||
883 | static 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 | ||
894 | module_i2c_driver(edt_ft5x06_ts_driver); | |
895 | ||
896 | MODULE_AUTHOR("Simon Budig <simon.budig@kernelconcepts.de>"); | |
897 | MODULE_DESCRIPTION("EDT FT5x06 I2C Touchscreen Driver"); | |
898 | MODULE_LICENSE("GPL"); |