1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Core Source for: |
4 | * Cypress TrueTouch(TM) Standard Product (TTSP) touchscreen drivers. |
5 | * For use with Cypress Txx3xx parts. |
6 | * Supported parts include: |
7 | * CY8CTST341 |
8 | * CY8CTMA340 |
9 | * |
10 | * Copyright (C) 2009, 2010, 2011 Cypress Semiconductor, Inc. |
11 | * Copyright (C) 2012 Javier Martinez Canillas <javier@dowhile0.org> |
12 | * |
13 | * Contact Cypress Semiconductor at www.cypress.com <kev@cypress.com> |
14 | */ |
15 | |
16 | #include <linux/delay.h> |
17 | #include <linux/input.h> |
18 | #include <linux/input/mt.h> |
19 | #include <linux/input/touchscreen.h> |
20 | #include <linux/gpio.h> |
21 | #include <linux/interrupt.h> |
22 | #include <linux/slab.h> |
23 | #include <linux/property.h> |
24 | #include <linux/gpio/consumer.h> |
25 | #include <linux/regulator/consumer.h> |
26 | |
27 | #include "cyttsp_core.h" |
28 | |
29 | /* Bootloader number of command keys */ |
30 | #define CY_NUM_BL_KEYS 8 |
31 | |
32 | /* helpers */ |
33 | #define GET_NUM_TOUCHES(x) ((x) & 0x0F) |
34 | #define IS_LARGE_AREA(x) (((x) & 0x10) >> 4) |
35 | #define IS_BAD_PKT(x) ((x) & 0x20) |
36 | #define IS_VALID_APP(x) ((x) & 0x01) |
37 | #define IS_OPERATIONAL_ERR(x) ((x) & 0x3F) |
38 | #define GET_HSTMODE(reg) (((reg) & 0x70) >> 4) |
39 | #define GET_BOOTLOADERMODE(reg) (((reg) & 0x10) >> 4) |
40 | |
41 | #define CY_REG_BASE 0x00 |
42 | #define CY_REG_ACT_DIST 0x1E |
43 | #define CY_REG_ACT_INTRVL 0x1D |
44 | #define CY_REG_TCH_TMOUT (CY_REG_ACT_INTRVL + 1) |
45 | #define CY_REG_LP_INTRVL (CY_REG_TCH_TMOUT + 1) |
46 | #define CY_MAXZ 255 |
47 | #define CY_DELAY_DFLT 20 /* ms */ |
48 | #define CY_DELAY_MAX 500 |
49 | /* Active distance in pixels for a gesture to be reported */ |
50 | #define CY_ACT_DIST_DFLT 0xF8 /* pixels */ |
51 | #define CY_ACT_DIST_MASK 0x0F |
52 | /* Active Power state scanning/processing refresh interval */ |
53 | #define CY_ACT_INTRVL_DFLT 0x00 /* ms */ |
54 | /* Low Power state scanning/processing refresh interval */ |
55 | #define CY_LP_INTRVL_DFLT 0x0A /* ms */ |
56 | /* touch timeout for the Active power */ |
57 | #define CY_TCH_TMOUT_DFLT 0xFF /* ms */ |
58 | #define CY_HNDSHK_BIT 0x80 |
59 | /* device mode bits */ |
60 | #define CY_OPERATE_MODE 0x00 |
61 | #define CY_SYSINFO_MODE 0x10 |
62 | /* power mode select bits */ |
63 | #define CY_SOFT_RESET_MODE 0x01 /* return to Bootloader mode */ |
64 | #define CY_DEEP_SLEEP_MODE 0x02 |
65 | #define CY_LOW_POWER_MODE 0x04 |
66 | |
67 | /* Slots management */ |
68 | #define CY_MAX_FINGER 4 |
69 | #define CY_MAX_ID 16 |
70 | |
71 | static const u8 bl_command[] = { |
72 | 0x00, /* file offset */ |
73 | 0xFF, /* command */ |
74 | 0xA5, /* exit bootloader command */ |
75 | 0, 1, 2, 3, 4, 5, 6, 7 /* default keys */ |
76 | }; |
77 | |
78 | static int ttsp_read_block_data(struct cyttsp *ts, u8 command, |
79 | u8 length, void *buf) |
80 | { |
81 | int error; |
82 | int tries; |
83 | |
84 | for (tries = 0; tries < CY_NUM_RETRY; tries++) { |
85 | error = ts->bus_ops->read(ts->dev, ts->xfer_buf, command, |
86 | length, buf); |
87 | if (!error) |
88 | return 0; |
89 | |
90 | msleep(CY_DELAY_DFLT); |
91 | } |
92 | |
93 | return -EIO; |
94 | } |
95 | |
96 | static int ttsp_write_block_data(struct cyttsp *ts, u8 command, |
97 | u8 length, void *buf) |
98 | { |
99 | int error; |
100 | int tries; |
101 | |
102 | for (tries = 0; tries < CY_NUM_RETRY; tries++) { |
103 | error = ts->bus_ops->write(ts->dev, ts->xfer_buf, command, |
104 | length, buf); |
105 | if (!error) |
106 | return 0; |
107 | |
108 | msleep(CY_DELAY_DFLT); |
109 | } |
110 | |
111 | return -EIO; |
112 | } |
113 | |
114 | static int ttsp_send_command(struct cyttsp *ts, u8 cmd) |
115 | { |
116 | return ttsp_write_block_data(ts, CY_REG_BASE, length: sizeof(cmd), buf: &cmd); |
117 | } |
118 | |
119 | static int cyttsp_handshake(struct cyttsp *ts) |
120 | { |
121 | if (ts->use_hndshk) |
122 | return ttsp_send_command(ts, |
123 | cmd: ts->xy_data.hst_mode ^ CY_HNDSHK_BIT); |
124 | |
125 | return 0; |
126 | } |
127 | |
128 | static int cyttsp_load_bl_regs(struct cyttsp *ts) |
129 | { |
130 | memset(&ts->bl_data, 0, sizeof(ts->bl_data)); |
131 | ts->bl_data.bl_status = 0x10; |
132 | |
133 | return ttsp_read_block_data(ts, CY_REG_BASE, |
134 | length: sizeof(ts->bl_data), buf: &ts->bl_data); |
135 | } |
136 | |
137 | static int cyttsp_exit_bl_mode(struct cyttsp *ts) |
138 | { |
139 | int error; |
140 | u8 bl_cmd[sizeof(bl_command)]; |
141 | |
142 | memcpy(bl_cmd, bl_command, sizeof(bl_command)); |
143 | if (ts->bl_keys) |
144 | memcpy(&bl_cmd[sizeof(bl_command) - CY_NUM_BL_KEYS], |
145 | ts->bl_keys, CY_NUM_BL_KEYS); |
146 | |
147 | error = ttsp_write_block_data(ts, CY_REG_BASE, |
148 | length: sizeof(bl_cmd), buf: bl_cmd); |
149 | if (error) |
150 | return error; |
151 | |
152 | /* wait for TTSP Device to complete the operation */ |
153 | msleep(CY_DELAY_DFLT); |
154 | |
155 | error = cyttsp_load_bl_regs(ts); |
156 | if (error) |
157 | return error; |
158 | |
159 | if (GET_BOOTLOADERMODE(ts->bl_data.bl_status)) |
160 | return -EIO; |
161 | |
162 | return 0; |
163 | } |
164 | |
165 | static int cyttsp_set_operational_mode(struct cyttsp *ts) |
166 | { |
167 | int error; |
168 | |
169 | error = ttsp_send_command(ts, CY_OPERATE_MODE); |
170 | if (error) |
171 | return error; |
172 | |
173 | /* wait for TTSP Device to complete switch to Operational mode */ |
174 | error = ttsp_read_block_data(ts, CY_REG_BASE, |
175 | length: sizeof(ts->xy_data), buf: &ts->xy_data); |
176 | if (error) |
177 | return error; |
178 | |
179 | error = cyttsp_handshake(ts); |
180 | if (error) |
181 | return error; |
182 | |
183 | return ts->xy_data.act_dist == CY_ACT_DIST_DFLT ? -EIO : 0; |
184 | } |
185 | |
186 | static int cyttsp_set_sysinfo_mode(struct cyttsp *ts) |
187 | { |
188 | int error; |
189 | |
190 | memset(&ts->sysinfo_data, 0, sizeof(ts->sysinfo_data)); |
191 | |
192 | /* switch to sysinfo mode */ |
193 | error = ttsp_send_command(ts, CY_SYSINFO_MODE); |
194 | if (error) |
195 | return error; |
196 | |
197 | /* read sysinfo registers */ |
198 | msleep(CY_DELAY_DFLT); |
199 | error = ttsp_read_block_data(ts, CY_REG_BASE, length: sizeof(ts->sysinfo_data), |
200 | buf: &ts->sysinfo_data); |
201 | if (error) |
202 | return error; |
203 | |
204 | error = cyttsp_handshake(ts); |
205 | if (error) |
206 | return error; |
207 | |
208 | if (!ts->sysinfo_data.tts_verh && !ts->sysinfo_data.tts_verl) |
209 | return -EIO; |
210 | |
211 | return 0; |
212 | } |
213 | |
214 | static int cyttsp_set_sysinfo_regs(struct cyttsp *ts) |
215 | { |
216 | int retval = 0; |
217 | |
218 | if (ts->act_intrvl != CY_ACT_INTRVL_DFLT || |
219 | ts->tch_tmout != CY_TCH_TMOUT_DFLT || |
220 | ts->lp_intrvl != CY_LP_INTRVL_DFLT) { |
221 | |
222 | u8 intrvl_ray[] = { |
223 | ts->act_intrvl, |
224 | ts->tch_tmout, |
225 | ts->lp_intrvl |
226 | }; |
227 | |
228 | /* set intrvl registers */ |
229 | retval = ttsp_write_block_data(ts, CY_REG_ACT_INTRVL, |
230 | length: sizeof(intrvl_ray), buf: intrvl_ray); |
231 | msleep(CY_DELAY_DFLT); |
232 | } |
233 | |
234 | return retval; |
235 | } |
236 | |
237 | static void cyttsp_hard_reset(struct cyttsp *ts) |
238 | { |
239 | if (ts->reset_gpio) { |
240 | /* |
241 | * According to the CY8CTMA340 datasheet page 21, the external |
242 | * reset pulse width should be >= 1 ms. The datasheet does not |
243 | * specify how long we have to wait after reset but a vendor |
244 | * tree specifies 5 ms here. |
245 | */ |
246 | gpiod_set_value_cansleep(desc: ts->reset_gpio, value: 1); |
247 | usleep_range(min: 1000, max: 2000); |
248 | gpiod_set_value_cansleep(desc: ts->reset_gpio, value: 0); |
249 | usleep_range(min: 5000, max: 6000); |
250 | } |
251 | } |
252 | |
253 | static int cyttsp_soft_reset(struct cyttsp *ts) |
254 | { |
255 | int retval; |
256 | |
257 | /* wait for interrupt to set ready completion */ |
258 | reinit_completion(x: &ts->bl_ready); |
259 | ts->state = CY_BL_STATE; |
260 | |
261 | enable_irq(irq: ts->irq); |
262 | |
263 | retval = ttsp_send_command(ts, CY_SOFT_RESET_MODE); |
264 | if (retval) { |
265 | dev_err(ts->dev, "failed to send soft reset\n" ); |
266 | goto out; |
267 | } |
268 | |
269 | if (!wait_for_completion_timeout(x: &ts->bl_ready, |
270 | timeout: msecs_to_jiffies(CY_DELAY_DFLT * CY_DELAY_MAX))) { |
271 | dev_err(ts->dev, "timeout waiting for soft reset\n" ); |
272 | retval = -EIO; |
273 | } |
274 | |
275 | out: |
276 | ts->state = CY_IDLE_STATE; |
277 | disable_irq(irq: ts->irq); |
278 | return retval; |
279 | } |
280 | |
281 | static int cyttsp_act_dist_setup(struct cyttsp *ts) |
282 | { |
283 | u8 act_dist_setup = ts->act_dist; |
284 | |
285 | /* Init gesture; active distance setup */ |
286 | return ttsp_write_block_data(ts, CY_REG_ACT_DIST, |
287 | length: sizeof(act_dist_setup), buf: &act_dist_setup); |
288 | } |
289 | |
290 | static void (struct cyttsp_xydata *xy_data, int *ids) |
291 | { |
292 | ids[0] = xy_data->touch12_id >> 4; |
293 | ids[1] = xy_data->touch12_id & 0xF; |
294 | ids[2] = xy_data->touch34_id >> 4; |
295 | ids[3] = xy_data->touch34_id & 0xF; |
296 | } |
297 | |
298 | static const struct cyttsp_tch *cyttsp_get_tch(struct cyttsp_xydata *xy_data, |
299 | int idx) |
300 | { |
301 | switch (idx) { |
302 | case 0: |
303 | return &xy_data->tch1; |
304 | case 1: |
305 | return &xy_data->tch2; |
306 | case 2: |
307 | return &xy_data->tch3; |
308 | case 3: |
309 | return &xy_data->tch4; |
310 | default: |
311 | return NULL; |
312 | } |
313 | } |
314 | |
315 | static void cyttsp_report_tchdata(struct cyttsp *ts) |
316 | { |
317 | struct cyttsp_xydata *xy_data = &ts->xy_data; |
318 | struct input_dev *input = ts->input; |
319 | int num_tch = GET_NUM_TOUCHES(xy_data->tt_stat); |
320 | const struct cyttsp_tch *tch; |
321 | int ids[CY_MAX_ID]; |
322 | int i; |
323 | DECLARE_BITMAP(used, CY_MAX_ID); |
324 | |
325 | if (IS_LARGE_AREA(xy_data->tt_stat) == 1) { |
326 | /* terminate all active tracks */ |
327 | num_tch = 0; |
328 | dev_dbg(ts->dev, "%s: Large area detected\n" , __func__); |
329 | } else if (num_tch > CY_MAX_FINGER) { |
330 | /* terminate all active tracks */ |
331 | num_tch = 0; |
332 | dev_dbg(ts->dev, "%s: Num touch error detected\n" , __func__); |
333 | } else if (IS_BAD_PKT(xy_data->tt_mode)) { |
334 | /* terminate all active tracks */ |
335 | num_tch = 0; |
336 | dev_dbg(ts->dev, "%s: Invalid buffer detected\n" , __func__); |
337 | } |
338 | |
339 | cyttsp_extract_track_ids(xy_data, ids); |
340 | |
341 | bitmap_zero(dst: used, CY_MAX_ID); |
342 | |
343 | for (i = 0; i < num_tch; i++) { |
344 | tch = cyttsp_get_tch(xy_data, idx: i); |
345 | |
346 | input_mt_slot(dev: input, slot: ids[i]); |
347 | input_mt_report_slot_state(dev: input, MT_TOOL_FINGER, active: true); |
348 | input_report_abs(dev: input, ABS_MT_POSITION_X, be16_to_cpu(tch->x)); |
349 | input_report_abs(dev: input, ABS_MT_POSITION_Y, be16_to_cpu(tch->y)); |
350 | input_report_abs(dev: input, ABS_MT_TOUCH_MAJOR, value: tch->z); |
351 | |
352 | __set_bit(ids[i], used); |
353 | } |
354 | |
355 | for (i = 0; i < CY_MAX_ID; i++) { |
356 | if (test_bit(i, used)) |
357 | continue; |
358 | |
359 | input_mt_slot(dev: input, slot: i); |
360 | input_mt_report_slot_inactive(dev: input); |
361 | } |
362 | |
363 | input_sync(dev: input); |
364 | } |
365 | |
366 | static irqreturn_t cyttsp_irq(int irq, void *handle) |
367 | { |
368 | struct cyttsp *ts = handle; |
369 | int error; |
370 | |
371 | if (unlikely(ts->state == CY_BL_STATE)) { |
372 | complete(&ts->bl_ready); |
373 | goto out; |
374 | } |
375 | |
376 | /* Get touch data from CYTTSP device */ |
377 | error = ttsp_read_block_data(ts, CY_REG_BASE, |
378 | length: sizeof(struct cyttsp_xydata), buf: &ts->xy_data); |
379 | if (error) |
380 | goto out; |
381 | |
382 | /* provide flow control handshake */ |
383 | error = cyttsp_handshake(ts); |
384 | if (error) |
385 | goto out; |
386 | |
387 | if (unlikely(ts->state == CY_IDLE_STATE)) |
388 | goto out; |
389 | |
390 | if (GET_BOOTLOADERMODE(ts->xy_data.tt_mode)) { |
391 | /* |
392 | * TTSP device has reset back to bootloader mode. |
393 | * Restore to operational mode. |
394 | */ |
395 | error = cyttsp_exit_bl_mode(ts); |
396 | if (error) { |
397 | dev_err(ts->dev, |
398 | "Could not return to operational mode, err: %d\n" , |
399 | error); |
400 | ts->state = CY_IDLE_STATE; |
401 | } |
402 | } else { |
403 | cyttsp_report_tchdata(ts); |
404 | } |
405 | |
406 | out: |
407 | return IRQ_HANDLED; |
408 | } |
409 | |
410 | static int cyttsp_power_on(struct cyttsp *ts) |
411 | { |
412 | int error; |
413 | |
414 | error = cyttsp_soft_reset(ts); |
415 | if (error) |
416 | return error; |
417 | |
418 | error = cyttsp_load_bl_regs(ts); |
419 | if (error) |
420 | return error; |
421 | |
422 | if (GET_BOOTLOADERMODE(ts->bl_data.bl_status) && |
423 | IS_VALID_APP(ts->bl_data.bl_status)) { |
424 | error = cyttsp_exit_bl_mode(ts); |
425 | if (error) { |
426 | dev_err(ts->dev, "failed to exit bootloader mode\n" ); |
427 | return error; |
428 | } |
429 | } |
430 | |
431 | if (GET_HSTMODE(ts->bl_data.bl_file) != CY_OPERATE_MODE || |
432 | IS_OPERATIONAL_ERR(ts->bl_data.bl_status)) { |
433 | return -ENODEV; |
434 | } |
435 | |
436 | error = cyttsp_set_sysinfo_mode(ts); |
437 | if (error) |
438 | return error; |
439 | |
440 | error = cyttsp_set_sysinfo_regs(ts); |
441 | if (error) |
442 | return error; |
443 | |
444 | error = cyttsp_set_operational_mode(ts); |
445 | if (error) |
446 | return error; |
447 | |
448 | /* init active distance */ |
449 | error = cyttsp_act_dist_setup(ts); |
450 | if (error) |
451 | return error; |
452 | |
453 | ts->state = CY_ACTIVE_STATE; |
454 | |
455 | return 0; |
456 | } |
457 | |
458 | static int cyttsp_enable(struct cyttsp *ts) |
459 | { |
460 | int error; |
461 | |
462 | /* |
463 | * The device firmware can wake on an I2C or SPI memory slave |
464 | * address match. So just reading a register is sufficient to |
465 | * wake up the device. The first read attempt will fail but it |
466 | * will wake it up making the second read attempt successful. |
467 | */ |
468 | error = ttsp_read_block_data(ts, CY_REG_BASE, |
469 | length: sizeof(ts->xy_data), buf: &ts->xy_data); |
470 | if (error) |
471 | return error; |
472 | |
473 | if (GET_HSTMODE(ts->xy_data.hst_mode)) |
474 | return -EIO; |
475 | |
476 | enable_irq(irq: ts->irq); |
477 | |
478 | return 0; |
479 | } |
480 | |
481 | static int cyttsp_disable(struct cyttsp *ts) |
482 | { |
483 | int error; |
484 | |
485 | error = ttsp_send_command(ts, CY_LOW_POWER_MODE); |
486 | if (error) |
487 | return error; |
488 | |
489 | disable_irq(irq: ts->irq); |
490 | |
491 | return 0; |
492 | } |
493 | |
494 | static int cyttsp_suspend(struct device *dev) |
495 | { |
496 | struct cyttsp *ts = dev_get_drvdata(dev); |
497 | int retval = 0; |
498 | |
499 | mutex_lock(&ts->input->mutex); |
500 | |
501 | if (input_device_enabled(dev: ts->input)) { |
502 | retval = cyttsp_disable(ts); |
503 | if (retval == 0) |
504 | ts->suspended = true; |
505 | } |
506 | |
507 | mutex_unlock(lock: &ts->input->mutex); |
508 | |
509 | return retval; |
510 | } |
511 | |
512 | static int cyttsp_resume(struct device *dev) |
513 | { |
514 | struct cyttsp *ts = dev_get_drvdata(dev); |
515 | |
516 | mutex_lock(&ts->input->mutex); |
517 | |
518 | if (input_device_enabled(dev: ts->input)) |
519 | cyttsp_enable(ts); |
520 | |
521 | ts->suspended = false; |
522 | |
523 | mutex_unlock(lock: &ts->input->mutex); |
524 | |
525 | return 0; |
526 | } |
527 | |
528 | EXPORT_GPL_SIMPLE_DEV_PM_OPS(cyttsp_pm_ops, cyttsp_suspend, cyttsp_resume); |
529 | |
530 | static int cyttsp_open(struct input_dev *dev) |
531 | { |
532 | struct cyttsp *ts = input_get_drvdata(dev); |
533 | int retval = 0; |
534 | |
535 | if (!ts->suspended) |
536 | retval = cyttsp_enable(ts); |
537 | |
538 | return retval; |
539 | } |
540 | |
541 | static void cyttsp_close(struct input_dev *dev) |
542 | { |
543 | struct cyttsp *ts = input_get_drvdata(dev); |
544 | |
545 | if (!ts->suspended) |
546 | cyttsp_disable(ts); |
547 | } |
548 | |
549 | static int cyttsp_parse_properties(struct cyttsp *ts) |
550 | { |
551 | struct device *dev = ts->dev; |
552 | u32 dt_value; |
553 | int ret; |
554 | |
555 | ts->bl_keys = devm_kzalloc(dev, CY_NUM_BL_KEYS, GFP_KERNEL); |
556 | if (!ts->bl_keys) |
557 | return -ENOMEM; |
558 | |
559 | /* Set some default values */ |
560 | ts->use_hndshk = false; |
561 | ts->act_dist = CY_ACT_DIST_DFLT; |
562 | ts->act_intrvl = CY_ACT_INTRVL_DFLT; |
563 | ts->tch_tmout = CY_TCH_TMOUT_DFLT; |
564 | ts->lp_intrvl = CY_LP_INTRVL_DFLT; |
565 | |
566 | ret = device_property_read_u8_array(dev, propname: "bootloader-key" , |
567 | val: ts->bl_keys, CY_NUM_BL_KEYS); |
568 | if (ret) { |
569 | dev_err(dev, |
570 | "bootloader-key property could not be retrieved\n" ); |
571 | return ret; |
572 | } |
573 | |
574 | ts->use_hndshk = device_property_present(dev, propname: "use-handshake" ); |
575 | |
576 | if (!device_property_read_u32(dev, propname: "active-distance" , val: &dt_value)) { |
577 | if (dt_value > 15) { |
578 | dev_err(dev, "active-distance (%u) must be [0-15]\n" , |
579 | dt_value); |
580 | return -EINVAL; |
581 | } |
582 | ts->act_dist &= ~CY_ACT_DIST_MASK; |
583 | ts->act_dist |= dt_value; |
584 | } |
585 | |
586 | if (!device_property_read_u32(dev, propname: "active-interval-ms" , val: &dt_value)) { |
587 | if (dt_value > 255) { |
588 | dev_err(dev, "active-interval-ms (%u) must be [0-255]\n" , |
589 | dt_value); |
590 | return -EINVAL; |
591 | } |
592 | ts->act_intrvl = dt_value; |
593 | } |
594 | |
595 | if (!device_property_read_u32(dev, propname: "lowpower-interval-ms" , val: &dt_value)) { |
596 | if (dt_value > 2550) { |
597 | dev_err(dev, "lowpower-interval-ms (%u) must be [0-2550]\n" , |
598 | dt_value); |
599 | return -EINVAL; |
600 | } |
601 | /* Register value is expressed in 0.01s / bit */ |
602 | ts->lp_intrvl = dt_value / 10; |
603 | } |
604 | |
605 | if (!device_property_read_u32(dev, propname: "touch-timeout-ms" , val: &dt_value)) { |
606 | if (dt_value > 2550) { |
607 | dev_err(dev, "touch-timeout-ms (%u) must be [0-2550]\n" , |
608 | dt_value); |
609 | return -EINVAL; |
610 | } |
611 | /* Register value is expressed in 0.01s / bit */ |
612 | ts->tch_tmout = dt_value / 10; |
613 | } |
614 | |
615 | return 0; |
616 | } |
617 | |
618 | static void cyttsp_disable_regulators(void *_ts) |
619 | { |
620 | struct cyttsp *ts = _ts; |
621 | |
622 | regulator_bulk_disable(ARRAY_SIZE(ts->regulators), |
623 | consumers: ts->regulators); |
624 | } |
625 | |
626 | struct cyttsp *cyttsp_probe(const struct cyttsp_bus_ops *bus_ops, |
627 | struct device *dev, int irq, size_t xfer_buf_size) |
628 | { |
629 | struct cyttsp *ts; |
630 | struct input_dev *input_dev; |
631 | int error; |
632 | |
633 | ts = devm_kzalloc(dev, size: sizeof(*ts) + xfer_buf_size, GFP_KERNEL); |
634 | if (!ts) |
635 | return ERR_PTR(error: -ENOMEM); |
636 | |
637 | input_dev = devm_input_allocate_device(dev); |
638 | if (!input_dev) |
639 | return ERR_PTR(error: -ENOMEM); |
640 | |
641 | ts->dev = dev; |
642 | ts->input = input_dev; |
643 | ts->bus_ops = bus_ops; |
644 | ts->irq = irq; |
645 | |
646 | /* |
647 | * VCPIN is the analog voltage supply |
648 | * VDD is the digital voltage supply |
649 | */ |
650 | ts->regulators[0].supply = "vcpin" ; |
651 | ts->regulators[1].supply = "vdd" ; |
652 | error = devm_regulator_bulk_get(dev, ARRAY_SIZE(ts->regulators), |
653 | consumers: ts->regulators); |
654 | if (error) { |
655 | dev_err(dev, "Failed to get regulators: %d\n" , error); |
656 | return ERR_PTR(error); |
657 | } |
658 | |
659 | error = regulator_bulk_enable(ARRAY_SIZE(ts->regulators), |
660 | consumers: ts->regulators); |
661 | if (error) { |
662 | dev_err(dev, "Cannot enable regulators: %d\n" , error); |
663 | return ERR_PTR(error); |
664 | } |
665 | |
666 | error = devm_add_action_or_reset(dev, cyttsp_disable_regulators, ts); |
667 | if (error) { |
668 | dev_err(dev, "failed to install chip disable handler\n" ); |
669 | return ERR_PTR(error); |
670 | } |
671 | |
672 | ts->reset_gpio = devm_gpiod_get_optional(dev, con_id: "reset" , flags: GPIOD_OUT_LOW); |
673 | if (IS_ERR(ptr: ts->reset_gpio)) { |
674 | error = PTR_ERR(ptr: ts->reset_gpio); |
675 | dev_err(dev, "Failed to request reset gpio, error %d\n" , error); |
676 | return ERR_PTR(error); |
677 | } |
678 | |
679 | error = cyttsp_parse_properties(ts); |
680 | if (error) |
681 | return ERR_PTR(error); |
682 | |
683 | init_completion(x: &ts->bl_ready); |
684 | |
685 | input_dev->name = "Cypress TTSP TouchScreen" ; |
686 | input_dev->id.bustype = bus_ops->bustype; |
687 | input_dev->dev.parent = ts->dev; |
688 | |
689 | input_dev->open = cyttsp_open; |
690 | input_dev->close = cyttsp_close; |
691 | |
692 | input_set_drvdata(dev: input_dev, data: ts); |
693 | |
694 | input_set_capability(dev: input_dev, EV_ABS, ABS_MT_POSITION_X); |
695 | input_set_capability(dev: input_dev, EV_ABS, ABS_MT_POSITION_Y); |
696 | /* One byte for width 0..255 so this is the limit */ |
697 | input_set_abs_params(dev: input_dev, ABS_MT_TOUCH_MAJOR, min: 0, max: 255, fuzz: 0, flat: 0); |
698 | |
699 | touchscreen_parse_properties(input: input_dev, multitouch: true, NULL); |
700 | |
701 | error = input_mt_init_slots(dev: input_dev, CY_MAX_ID, INPUT_MT_DIRECT); |
702 | if (error) { |
703 | dev_err(dev, "Unable to init MT slots.\n" ); |
704 | return ERR_PTR(error); |
705 | } |
706 | |
707 | error = devm_request_threaded_irq(dev, irq: ts->irq, NULL, thread_fn: cyttsp_irq, |
708 | IRQF_ONESHOT | IRQF_NO_AUTOEN, |
709 | devname: "cyttsp" , dev_id: ts); |
710 | if (error) { |
711 | dev_err(ts->dev, "failed to request IRQ %d, err: %d\n" , |
712 | ts->irq, error); |
713 | return ERR_PTR(error); |
714 | } |
715 | |
716 | cyttsp_hard_reset(ts); |
717 | |
718 | error = cyttsp_power_on(ts); |
719 | if (error) |
720 | return ERR_PTR(error); |
721 | |
722 | error = input_register_device(input_dev); |
723 | if (error) { |
724 | dev_err(ts->dev, "failed to register input device: %d\n" , |
725 | error); |
726 | return ERR_PTR(error); |
727 | } |
728 | |
729 | return ts; |
730 | } |
731 | EXPORT_SYMBOL_GPL(cyttsp_probe); |
732 | |
733 | MODULE_LICENSE("GPL" ); |
734 | MODULE_DESCRIPTION("Cypress TrueTouch(R) Standard touchscreen driver core" ); |
735 | MODULE_AUTHOR("Cypress" ); |
736 | |