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6ac24381 MW |
1 | /* |
2 | * TSC2004/TSC2005 touchscreen driver core | |
3 | * | |
4 | * Copyright (C) 2006-2010 Nokia Corporation | |
5 | * Copyright (C) 2015 QWERTY Embedded Design | |
6 | * Copyright (C) 2015 EMAC Inc. | |
7 | * | |
8 | * Author: Lauri Leukkunen <lauri.leukkunen@nokia.com> | |
9 | * based on TSC2301 driver by Klaus K. Pedersen <klaus.k.pedersen@nokia.com> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 of the License, or | |
14 | * (at your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | */ | |
21 | ||
22 | #include <linux/kernel.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/input.h> | |
25 | #include <linux/input/touchscreen.h> | |
26 | #include <linux/interrupt.h> | |
27 | #include <linux/delay.h> | |
28 | #include <linux/pm.h> | |
29 | #include <linux/of.h> | |
30 | #include <linux/spi/tsc2005.h> | |
31 | #include <linux/regulator/consumer.h> | |
32 | #include <linux/regmap.h> | |
33 | #include <linux/gpio/consumer.h> | |
34 | #include "tsc200x-core.h" | |
35 | ||
36 | /* | |
37 | * The touchscreen interface operates as follows: | |
38 | * | |
39 | * 1) Pen is pressed against the touchscreen. | |
ef3b98c2 MW |
40 | * 2) TSC200X performs AD conversion. |
41 | * 3) After the conversion is done TSC200X drives DAV line down. | |
42 | * 4) GPIO IRQ is received and tsc200x_irq_thread() is scheduled. | |
43 | * 5) tsc200x_irq_thread() queues up a transfer to fetch the x, y, z1, z2 | |
6ac24381 | 44 | * values. |
ef3b98c2 MW |
45 | * 6) tsc200x_irq_thread() reports coordinates to input layer and sets up |
46 | * tsc200x_penup_timer() to be called after TSC200X_PENUP_TIME_MS (40ms). | |
6ac24381 MW |
47 | * 7) When the penup timer expires, there have not been touch or DAV interrupts |
48 | * during the last 40ms which means the pen has been lifted. | |
49 | * | |
ef3b98c2 | 50 | * ESD recovery via a hardware reset is done if the TSC200X doesn't respond |
6ac24381 MW |
51 | * after a configurable period (in ms) of activity. If esd_timeout is 0, the |
52 | * watchdog is disabled. | |
53 | */ | |
54 | ||
ef3b98c2 MW |
55 | static const struct regmap_range tsc200x_writable_ranges[] = { |
56 | regmap_reg_range(TSC200X_REG_AUX_HIGH, TSC200X_REG_CFR2), | |
6ac24381 MW |
57 | }; |
58 | ||
ef3b98c2 MW |
59 | static const struct regmap_access_table tsc200x_writable_table = { |
60 | .yes_ranges = tsc200x_writable_ranges, | |
61 | .n_yes_ranges = ARRAY_SIZE(tsc200x_writable_ranges), | |
6ac24381 MW |
62 | }; |
63 | ||
64 | const struct regmap_config tsc200x_regmap_config = { | |
65 | .reg_bits = 8, | |
66 | .val_bits = 16, | |
67 | .reg_stride = 0x08, | |
68 | .max_register = 0x78, | |
ef3b98c2 MW |
69 | .read_flag_mask = TSC200X_REG_READ, |
70 | .write_flag_mask = TSC200X_REG_PND0, | |
71 | .wr_table = &tsc200x_writable_table, | |
6ac24381 MW |
72 | .use_single_rw = true, |
73 | }; | |
74 | EXPORT_SYMBOL_GPL(tsc200x_regmap_config); | |
75 | ||
ef3b98c2 | 76 | struct tsc200x_data { |
6ac24381 MW |
77 | u16 x; |
78 | u16 y; | |
79 | u16 z1; | |
80 | u16 z2; | |
81 | } __packed; | |
ef3b98c2 | 82 | #define TSC200X_DATA_REGS 4 |
6ac24381 | 83 | |
ef3b98c2 | 84 | struct tsc200x { |
6ac24381 MW |
85 | struct device *dev; |
86 | struct regmap *regmap; | |
87 | __u16 bustype; | |
88 | ||
89 | struct input_dev *idev; | |
90 | char phys[32]; | |
91 | ||
92 | struct mutex mutex; | |
93 | ||
94 | /* raw copy of previous x,y,z */ | |
95 | int in_x; | |
96 | int in_y; | |
97 | int in_z1; | |
98 | int in_z2; | |
99 | ||
100 | spinlock_t lock; | |
101 | struct timer_list penup_timer; | |
102 | ||
103 | unsigned int esd_timeout; | |
104 | struct delayed_work esd_work; | |
105 | unsigned long last_valid_interrupt; | |
106 | ||
107 | unsigned int x_plate_ohm; | |
108 | ||
109 | bool opened; | |
110 | bool suspended; | |
111 | ||
112 | bool pen_down; | |
113 | ||
114 | struct regulator *vio; | |
115 | ||
116 | struct gpio_desc *reset_gpio; | |
117 | void (*set_reset)(bool enable); | |
118 | int (*tsc200x_cmd)(struct device *dev, u8 cmd); | |
119 | int irq; | |
120 | }; | |
121 | ||
ef3b98c2 | 122 | static void tsc200x_update_pen_state(struct tsc200x *ts, |
6ac24381 MW |
123 | int x, int y, int pressure) |
124 | { | |
125 | if (pressure) { | |
126 | input_report_abs(ts->idev, ABS_X, x); | |
127 | input_report_abs(ts->idev, ABS_Y, y); | |
128 | input_report_abs(ts->idev, ABS_PRESSURE, pressure); | |
129 | if (!ts->pen_down) { | |
130 | input_report_key(ts->idev, BTN_TOUCH, !!pressure); | |
131 | ts->pen_down = true; | |
132 | } | |
133 | } else { | |
134 | input_report_abs(ts->idev, ABS_PRESSURE, 0); | |
135 | if (ts->pen_down) { | |
136 | input_report_key(ts->idev, BTN_TOUCH, 0); | |
137 | ts->pen_down = false; | |
138 | } | |
139 | } | |
140 | input_sync(ts->idev); | |
141 | dev_dbg(ts->dev, "point(%4d,%4d), pressure (%4d)\n", x, y, | |
142 | pressure); | |
143 | } | |
144 | ||
ef3b98c2 | 145 | static irqreturn_t tsc200x_irq_thread(int irq, void *_ts) |
6ac24381 | 146 | { |
ef3b98c2 | 147 | struct tsc200x *ts = _ts; |
6ac24381 MW |
148 | unsigned long flags; |
149 | unsigned int pressure; | |
ef3b98c2 | 150 | struct tsc200x_data tsdata; |
6ac24381 MW |
151 | int error; |
152 | ||
153 | /* read the coordinates */ | |
ef3b98c2 MW |
154 | error = regmap_bulk_read(ts->regmap, TSC200X_REG_X, &tsdata, |
155 | TSC200X_DATA_REGS); | |
6ac24381 MW |
156 | if (unlikely(error)) |
157 | goto out; | |
158 | ||
159 | /* validate position */ | |
160 | if (unlikely(tsdata.x > MAX_12BIT || tsdata.y > MAX_12BIT)) | |
161 | goto out; | |
162 | ||
163 | /* Skip reading if the pressure components are out of range */ | |
164 | if (unlikely(tsdata.z1 == 0 || tsdata.z2 > MAX_12BIT)) | |
165 | goto out; | |
166 | if (unlikely(tsdata.z1 >= tsdata.z2)) | |
167 | goto out; | |
168 | ||
169 | /* | |
170 | * Skip point if this is a pen down with the exact same values as | |
171 | * the value before pen-up - that implies SPI fed us stale data | |
172 | */ | |
173 | if (!ts->pen_down && | |
174 | ts->in_x == tsdata.x && ts->in_y == tsdata.y && | |
175 | ts->in_z1 == tsdata.z1 && ts->in_z2 == tsdata.z2) { | |
176 | goto out; | |
177 | } | |
178 | ||
179 | /* | |
180 | * At this point we are happy we have a valid and useful reading. | |
181 | * Remember it for later comparisons. We may now begin downsampling. | |
182 | */ | |
183 | ts->in_x = tsdata.x; | |
184 | ts->in_y = tsdata.y; | |
185 | ts->in_z1 = tsdata.z1; | |
186 | ts->in_z2 = tsdata.z2; | |
187 | ||
188 | /* Compute touch pressure resistance using equation #1 */ | |
189 | pressure = tsdata.x * (tsdata.z2 - tsdata.z1) / tsdata.z1; | |
190 | pressure = pressure * ts->x_plate_ohm / 4096; | |
191 | if (unlikely(pressure > MAX_12BIT)) | |
192 | goto out; | |
193 | ||
194 | spin_lock_irqsave(&ts->lock, flags); | |
195 | ||
ef3b98c2 | 196 | tsc200x_update_pen_state(ts, tsdata.x, tsdata.y, pressure); |
6ac24381 | 197 | mod_timer(&ts->penup_timer, |
ef3b98c2 | 198 | jiffies + msecs_to_jiffies(TSC200X_PENUP_TIME_MS)); |
6ac24381 MW |
199 | |
200 | spin_unlock_irqrestore(&ts->lock, flags); | |
201 | ||
202 | ts->last_valid_interrupt = jiffies; | |
203 | out: | |
204 | return IRQ_HANDLED; | |
205 | } | |
206 | ||
ef3b98c2 | 207 | static void tsc200x_penup_timer(unsigned long data) |
6ac24381 | 208 | { |
ef3b98c2 | 209 | struct tsc200x *ts = (struct tsc200x *)data; |
6ac24381 MW |
210 | unsigned long flags; |
211 | ||
212 | spin_lock_irqsave(&ts->lock, flags); | |
ef3b98c2 | 213 | tsc200x_update_pen_state(ts, 0, 0, 0); |
6ac24381 MW |
214 | spin_unlock_irqrestore(&ts->lock, flags); |
215 | } | |
216 | ||
ef3b98c2 | 217 | static void tsc200x_start_scan(struct tsc200x *ts) |
6ac24381 | 218 | { |
ef3b98c2 MW |
219 | regmap_write(ts->regmap, TSC200X_REG_CFR0, TSC200X_CFR0_INITVALUE); |
220 | regmap_write(ts->regmap, TSC200X_REG_CFR1, TSC200X_CFR1_INITVALUE); | |
221 | regmap_write(ts->regmap, TSC200X_REG_CFR2, TSC200X_CFR2_INITVALUE); | |
222 | ts->tsc200x_cmd(ts->dev, TSC200X_CMD_NORMAL); | |
6ac24381 MW |
223 | } |
224 | ||
ef3b98c2 | 225 | static void tsc200x_stop_scan(struct tsc200x *ts) |
6ac24381 | 226 | { |
ef3b98c2 | 227 | ts->tsc200x_cmd(ts->dev, TSC200X_CMD_STOP); |
6ac24381 MW |
228 | } |
229 | ||
ef3b98c2 | 230 | static void tsc200x_set_reset(struct tsc200x *ts, bool enable) |
6ac24381 MW |
231 | { |
232 | if (ts->reset_gpio) | |
233 | gpiod_set_value_cansleep(ts->reset_gpio, enable); | |
234 | else if (ts->set_reset) | |
235 | ts->set_reset(enable); | |
236 | } | |
237 | ||
238 | /* must be called with ts->mutex held */ | |
ef3b98c2 | 239 | static void __tsc200x_disable(struct tsc200x *ts) |
6ac24381 | 240 | { |
ef3b98c2 | 241 | tsc200x_stop_scan(ts); |
6ac24381 MW |
242 | |
243 | disable_irq(ts->irq); | |
244 | del_timer_sync(&ts->penup_timer); | |
245 | ||
246 | cancel_delayed_work_sync(&ts->esd_work); | |
247 | ||
248 | enable_irq(ts->irq); | |
249 | } | |
250 | ||
251 | /* must be called with ts->mutex held */ | |
ef3b98c2 | 252 | static void __tsc200x_enable(struct tsc200x *ts) |
6ac24381 | 253 | { |
ef3b98c2 | 254 | tsc200x_start_scan(ts); |
6ac24381 MW |
255 | |
256 | if (ts->esd_timeout && (ts->set_reset || ts->reset_gpio)) { | |
257 | ts->last_valid_interrupt = jiffies; | |
258 | schedule_delayed_work(&ts->esd_work, | |
259 | round_jiffies_relative( | |
260 | msecs_to_jiffies(ts->esd_timeout))); | |
261 | } | |
262 | } | |
263 | ||
ef3b98c2 | 264 | static ssize_t tsc200x_selftest_show(struct device *dev, |
6ac24381 MW |
265 | struct device_attribute *attr, |
266 | char *buf) | |
267 | { | |
ef3b98c2 | 268 | struct tsc200x *ts = dev_get_drvdata(dev); |
6ac24381 MW |
269 | unsigned int temp_high; |
270 | unsigned int temp_high_orig; | |
271 | unsigned int temp_high_test; | |
272 | bool success = true; | |
273 | int error; | |
274 | ||
275 | mutex_lock(&ts->mutex); | |
276 | ||
277 | /* | |
ef3b98c2 | 278 | * Test TSC200X communications via temp high register. |
6ac24381 | 279 | */ |
ef3b98c2 | 280 | __tsc200x_disable(ts); |
6ac24381 | 281 | |
ef3b98c2 | 282 | error = regmap_read(ts->regmap, TSC200X_REG_TEMP_HIGH, &temp_high_orig); |
6ac24381 MW |
283 | if (error) { |
284 | dev_warn(dev, "selftest failed: read error %d\n", error); | |
285 | success = false; | |
286 | goto out; | |
287 | } | |
288 | ||
289 | temp_high_test = (temp_high_orig - 1) & MAX_12BIT; | |
290 | ||
ef3b98c2 | 291 | error = regmap_write(ts->regmap, TSC200X_REG_TEMP_HIGH, temp_high_test); |
6ac24381 MW |
292 | if (error) { |
293 | dev_warn(dev, "selftest failed: write error %d\n", error); | |
294 | success = false; | |
295 | goto out; | |
296 | } | |
297 | ||
ef3b98c2 | 298 | error = regmap_read(ts->regmap, TSC200X_REG_TEMP_HIGH, &temp_high); |
6ac24381 MW |
299 | if (error) { |
300 | dev_warn(dev, "selftest failed: read error %d after write\n", | |
301 | error); | |
302 | success = false; | |
303 | goto out; | |
304 | } | |
305 | ||
306 | if (temp_high != temp_high_test) { | |
307 | dev_warn(dev, "selftest failed: %d != %d\n", | |
308 | temp_high, temp_high_test); | |
309 | success = false; | |
310 | } | |
311 | ||
312 | /* hardware reset */ | |
ef3b98c2 | 313 | tsc200x_set_reset(ts, false); |
6ac24381 | 314 | usleep_range(100, 500); /* only 10us required */ |
ef3b98c2 | 315 | tsc200x_set_reset(ts, true); |
6ac24381 MW |
316 | |
317 | if (!success) | |
318 | goto out; | |
319 | ||
320 | /* test that the reset really happened */ | |
ef3b98c2 | 321 | error = regmap_read(ts->regmap, TSC200X_REG_TEMP_HIGH, &temp_high); |
6ac24381 MW |
322 | if (error) { |
323 | dev_warn(dev, "selftest failed: read error %d after reset\n", | |
324 | error); | |
325 | success = false; | |
326 | goto out; | |
327 | } | |
328 | ||
329 | if (temp_high != temp_high_orig) { | |
330 | dev_warn(dev, "selftest failed after reset: %d != %d\n", | |
331 | temp_high, temp_high_orig); | |
332 | success = false; | |
333 | } | |
334 | ||
335 | out: | |
ef3b98c2 | 336 | __tsc200x_enable(ts); |
6ac24381 MW |
337 | mutex_unlock(&ts->mutex); |
338 | ||
339 | return sprintf(buf, "%d\n", success); | |
340 | } | |
341 | ||
ef3b98c2 | 342 | static DEVICE_ATTR(selftest, S_IRUGO, tsc200x_selftest_show, NULL); |
6ac24381 | 343 | |
ef3b98c2 | 344 | static struct attribute *tsc200x_attrs[] = { |
6ac24381 MW |
345 | &dev_attr_selftest.attr, |
346 | NULL | |
347 | }; | |
348 | ||
ef3b98c2 | 349 | static umode_t tsc200x_attr_is_visible(struct kobject *kobj, |
6ac24381 MW |
350 | struct attribute *attr, int n) |
351 | { | |
352 | struct device *dev = container_of(kobj, struct device, kobj); | |
ef3b98c2 | 353 | struct tsc200x *ts = dev_get_drvdata(dev); |
6ac24381 MW |
354 | umode_t mode = attr->mode; |
355 | ||
356 | if (attr == &dev_attr_selftest.attr) { | |
357 | if (!ts->set_reset && !ts->reset_gpio) | |
358 | mode = 0; | |
359 | } | |
360 | ||
361 | return mode; | |
362 | } | |
363 | ||
ef3b98c2 MW |
364 | static const struct attribute_group tsc200x_attr_group = { |
365 | .is_visible = tsc200x_attr_is_visible, | |
366 | .attrs = tsc200x_attrs, | |
6ac24381 MW |
367 | }; |
368 | ||
ef3b98c2 | 369 | static void tsc200x_esd_work(struct work_struct *work) |
6ac24381 | 370 | { |
ef3b98c2 | 371 | struct tsc200x *ts = container_of(work, struct tsc200x, esd_work.work); |
6ac24381 MW |
372 | int error; |
373 | unsigned int r; | |
374 | ||
375 | if (!mutex_trylock(&ts->mutex)) { | |
376 | /* | |
377 | * If the mutex is taken, it means that disable or enable is in | |
378 | * progress. In that case just reschedule the work. If the work | |
379 | * is not needed, it will be canceled by disable. | |
380 | */ | |
381 | goto reschedule; | |
382 | } | |
383 | ||
384 | if (time_is_after_jiffies(ts->last_valid_interrupt + | |
385 | msecs_to_jiffies(ts->esd_timeout))) | |
386 | goto out; | |
387 | ||
388 | /* We should be able to read register without disabling interrupts. */ | |
ef3b98c2 | 389 | error = regmap_read(ts->regmap, TSC200X_REG_CFR0, &r); |
6ac24381 | 390 | if (!error && |
ef3b98c2 | 391 | !((r ^ TSC200X_CFR0_INITVALUE) & TSC200X_CFR0_RW_MASK)) { |
6ac24381 MW |
392 | goto out; |
393 | } | |
394 | ||
395 | /* | |
396 | * If we could not read our known value from configuration register 0 | |
397 | * then we should reset the controller as if from power-up and start | |
398 | * scanning again. | |
399 | */ | |
ef3b98c2 | 400 | dev_info(ts->dev, "TSC200X not responding - resetting\n"); |
6ac24381 MW |
401 | |
402 | disable_irq(ts->irq); | |
403 | del_timer_sync(&ts->penup_timer); | |
404 | ||
ef3b98c2 | 405 | tsc200x_update_pen_state(ts, 0, 0, 0); |
6ac24381 | 406 | |
ef3b98c2 | 407 | tsc200x_set_reset(ts, false); |
6ac24381 | 408 | usleep_range(100, 500); /* only 10us required */ |
ef3b98c2 | 409 | tsc200x_set_reset(ts, true); |
6ac24381 MW |
410 | |
411 | enable_irq(ts->irq); | |
ef3b98c2 | 412 | tsc200x_start_scan(ts); |
6ac24381 MW |
413 | |
414 | out: | |
415 | mutex_unlock(&ts->mutex); | |
416 | reschedule: | |
417 | /* re-arm the watchdog */ | |
418 | schedule_delayed_work(&ts->esd_work, | |
419 | round_jiffies_relative( | |
420 | msecs_to_jiffies(ts->esd_timeout))); | |
421 | } | |
422 | ||
ef3b98c2 | 423 | static int tsc200x_open(struct input_dev *input) |
6ac24381 | 424 | { |
ef3b98c2 | 425 | struct tsc200x *ts = input_get_drvdata(input); |
6ac24381 MW |
426 | |
427 | mutex_lock(&ts->mutex); | |
428 | ||
429 | if (!ts->suspended) | |
ef3b98c2 | 430 | __tsc200x_enable(ts); |
6ac24381 MW |
431 | |
432 | ts->opened = true; | |
433 | ||
434 | mutex_unlock(&ts->mutex); | |
435 | ||
436 | return 0; | |
437 | } | |
438 | ||
ef3b98c2 | 439 | static void tsc200x_close(struct input_dev *input) |
6ac24381 | 440 | { |
ef3b98c2 | 441 | struct tsc200x *ts = input_get_drvdata(input); |
6ac24381 MW |
442 | |
443 | mutex_lock(&ts->mutex); | |
444 | ||
445 | if (!ts->suspended) | |
ef3b98c2 | 446 | __tsc200x_disable(ts); |
6ac24381 MW |
447 | |
448 | ts->opened = false; | |
449 | ||
450 | mutex_unlock(&ts->mutex); | |
451 | } | |
452 | ||
e9003c9c | 453 | int tsc200x_probe(struct device *dev, int irq, const struct input_id *tsc_id, |
6ac24381 MW |
454 | struct regmap *regmap, |
455 | int (*tsc200x_cmd)(struct device *dev, u8 cmd)) | |
456 | { | |
457 | const struct tsc2005_platform_data *pdata = dev_get_platdata(dev); | |
458 | struct device_node *np = dev->of_node; | |
459 | ||
ef3b98c2 | 460 | struct tsc200x *ts; |
6ac24381 MW |
461 | struct input_dev *input_dev; |
462 | unsigned int max_x = MAX_12BIT; | |
463 | unsigned int max_y = MAX_12BIT; | |
464 | unsigned int max_p = MAX_12BIT; | |
ef3b98c2 MW |
465 | unsigned int fudge_x = TSC200X_DEF_X_FUZZ; |
466 | unsigned int fudge_y = TSC200X_DEF_Y_FUZZ; | |
467 | unsigned int fudge_p = TSC200X_DEF_P_FUZZ; | |
468 | unsigned int x_plate_ohm = TSC200X_DEF_RESISTOR; | |
6ac24381 MW |
469 | unsigned int esd_timeout; |
470 | int error; | |
471 | ||
472 | if (!np && !pdata) { | |
473 | dev_err(dev, "no platform data\n"); | |
474 | return -ENODEV; | |
475 | } | |
476 | ||
477 | if (irq <= 0) { | |
478 | dev_err(dev, "no irq\n"); | |
479 | return -ENODEV; | |
480 | } | |
481 | ||
482 | if (IS_ERR(regmap)) | |
483 | return PTR_ERR(regmap); | |
484 | ||
485 | if (!tsc200x_cmd) { | |
486 | dev_err(dev, "no cmd function\n"); | |
487 | return -ENODEV; | |
488 | } | |
489 | ||
490 | if (pdata) { | |
491 | fudge_x = pdata->ts_x_fudge; | |
492 | fudge_y = pdata->ts_y_fudge; | |
493 | fudge_p = pdata->ts_pressure_fudge; | |
494 | max_x = pdata->ts_x_max; | |
495 | max_y = pdata->ts_y_max; | |
496 | max_p = pdata->ts_pressure_max; | |
497 | x_plate_ohm = pdata->ts_x_plate_ohm; | |
498 | esd_timeout = pdata->esd_timeout_ms; | |
499 | } else { | |
ef3b98c2 | 500 | x_plate_ohm = TSC200X_DEF_RESISTOR; |
6ac24381 MW |
501 | of_property_read_u32(np, "ti,x-plate-ohms", &x_plate_ohm); |
502 | esd_timeout = 0; | |
503 | of_property_read_u32(np, "ti,esd-recovery-timeout-ms", | |
504 | &esd_timeout); | |
505 | } | |
506 | ||
507 | ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL); | |
508 | if (!ts) | |
509 | return -ENOMEM; | |
510 | ||
511 | input_dev = devm_input_allocate_device(dev); | |
512 | if (!input_dev) | |
513 | return -ENOMEM; | |
514 | ||
515 | ts->irq = irq; | |
516 | ts->dev = dev; | |
517 | ts->idev = input_dev; | |
518 | ts->regmap = regmap; | |
519 | ts->tsc200x_cmd = tsc200x_cmd; | |
520 | ts->x_plate_ohm = x_plate_ohm; | |
521 | ts->esd_timeout = esd_timeout; | |
522 | ||
523 | ts->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH); | |
524 | if (IS_ERR(ts->reset_gpio)) { | |
525 | error = PTR_ERR(ts->reset_gpio); | |
526 | dev_err(dev, "error acquiring reset gpio: %d\n", error); | |
527 | return error; | |
528 | } | |
529 | ||
530 | ts->vio = devm_regulator_get_optional(dev, "vio"); | |
531 | if (IS_ERR(ts->vio)) { | |
532 | error = PTR_ERR(ts->vio); | |
533 | dev_err(dev, "vio regulator missing (%d)", error); | |
534 | return error; | |
535 | } | |
536 | ||
537 | if (!ts->reset_gpio && pdata) | |
538 | ts->set_reset = pdata->set_reset; | |
539 | ||
540 | mutex_init(&ts->mutex); | |
541 | ||
542 | spin_lock_init(&ts->lock); | |
ef3b98c2 | 543 | setup_timer(&ts->penup_timer, tsc200x_penup_timer, (unsigned long)ts); |
6ac24381 | 544 | |
ef3b98c2 | 545 | INIT_DELAYED_WORK(&ts->esd_work, tsc200x_esd_work); |
6ac24381 MW |
546 | |
547 | snprintf(ts->phys, sizeof(ts->phys), | |
548 | "%s/input-ts", dev_name(dev)); | |
549 | ||
e9003c9c MW |
550 | if (tsc_id->product == 2004) { |
551 | input_dev->name = "TSC200X touchscreen"; | |
552 | } else { | |
553 | input_dev->name = devm_kasprintf(dev, GFP_KERNEL, | |
554 | "TSC%04d touchscreen", | |
555 | tsc_id->product); | |
556 | if (!input_dev->name) | |
557 | return -ENOMEM; | |
558 | } | |
559 | ||
6ac24381 | 560 | input_dev->phys = ts->phys; |
e9003c9c | 561 | input_dev->id = *tsc_id; |
6ac24381 MW |
562 | input_dev->dev.parent = dev; |
563 | input_dev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY); | |
564 | input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); | |
565 | ||
566 | input_set_abs_params(input_dev, ABS_X, 0, max_x, fudge_x, 0); | |
567 | input_set_abs_params(input_dev, ABS_Y, 0, max_y, fudge_y, 0); | |
568 | input_set_abs_params(input_dev, ABS_PRESSURE, 0, max_p, fudge_p, 0); | |
569 | ||
570 | if (np) | |
571 | touchscreen_parse_properties(input_dev, false); | |
572 | ||
ef3b98c2 MW |
573 | input_dev->open = tsc200x_open; |
574 | input_dev->close = tsc200x_close; | |
6ac24381 MW |
575 | |
576 | input_set_drvdata(input_dev, ts); | |
577 | ||
578 | /* Ensure the touchscreen is off */ | |
ef3b98c2 | 579 | tsc200x_stop_scan(ts); |
6ac24381 MW |
580 | |
581 | error = devm_request_threaded_irq(dev, irq, NULL, | |
ef3b98c2 | 582 | tsc200x_irq_thread, |
6ac24381 | 583 | IRQF_TRIGGER_RISING | IRQF_ONESHOT, |
ef3b98c2 | 584 | "tsc200x", ts); |
6ac24381 MW |
585 | if (error) { |
586 | dev_err(dev, "Failed to request irq, err: %d\n", error); | |
587 | return error; | |
588 | } | |
589 | ||
590 | /* enable regulator for DT */ | |
591 | if (ts->vio) { | |
592 | error = regulator_enable(ts->vio); | |
593 | if (error) | |
594 | return error; | |
595 | } | |
596 | ||
597 | dev_set_drvdata(dev, ts); | |
ef3b98c2 | 598 | error = sysfs_create_group(&dev->kobj, &tsc200x_attr_group); |
6ac24381 MW |
599 | if (error) { |
600 | dev_err(dev, | |
601 | "Failed to create sysfs attributes, err: %d\n", error); | |
602 | goto disable_regulator; | |
603 | } | |
604 | ||
605 | error = input_register_device(ts->idev); | |
606 | if (error) { | |
607 | dev_err(dev, | |
608 | "Failed to register input device, err: %d\n", error); | |
609 | goto err_remove_sysfs; | |
610 | } | |
611 | ||
612 | irq_set_irq_wake(irq, 1); | |
613 | return 0; | |
614 | ||
615 | err_remove_sysfs: | |
ef3b98c2 | 616 | sysfs_remove_group(&dev->kobj, &tsc200x_attr_group); |
6ac24381 MW |
617 | disable_regulator: |
618 | if (ts->vio) | |
619 | regulator_disable(ts->vio); | |
620 | return error; | |
621 | } | |
622 | EXPORT_SYMBOL_GPL(tsc200x_probe); | |
623 | ||
624 | int tsc200x_remove(struct device *dev) | |
625 | { | |
ef3b98c2 | 626 | struct tsc200x *ts = dev_get_drvdata(dev); |
6ac24381 | 627 | |
ef3b98c2 | 628 | sysfs_remove_group(&dev->kobj, &tsc200x_attr_group); |
6ac24381 MW |
629 | |
630 | if (ts->vio) | |
631 | regulator_disable(ts->vio); | |
632 | ||
633 | return 0; | |
634 | } | |
635 | EXPORT_SYMBOL_GPL(tsc200x_remove); | |
636 | ||
ef3b98c2 | 637 | static int __maybe_unused tsc200x_suspend(struct device *dev) |
6ac24381 | 638 | { |
ef3b98c2 | 639 | struct tsc200x *ts = dev_get_drvdata(dev); |
6ac24381 MW |
640 | |
641 | mutex_lock(&ts->mutex); | |
642 | ||
643 | if (!ts->suspended && ts->opened) | |
ef3b98c2 | 644 | __tsc200x_disable(ts); |
6ac24381 MW |
645 | |
646 | ts->suspended = true; | |
647 | ||
648 | mutex_unlock(&ts->mutex); | |
649 | ||
650 | return 0; | |
651 | } | |
652 | ||
ef3b98c2 | 653 | static int __maybe_unused tsc200x_resume(struct device *dev) |
6ac24381 | 654 | { |
ef3b98c2 | 655 | struct tsc200x *ts = dev_get_drvdata(dev); |
6ac24381 MW |
656 | |
657 | mutex_lock(&ts->mutex); | |
658 | ||
659 | if (ts->suspended && ts->opened) | |
ef3b98c2 | 660 | __tsc200x_enable(ts); |
6ac24381 MW |
661 | |
662 | ts->suspended = false; | |
663 | ||
664 | mutex_unlock(&ts->mutex); | |
665 | ||
666 | return 0; | |
667 | } | |
668 | ||
ef3b98c2 | 669 | SIMPLE_DEV_PM_OPS(tsc200x_pm_ops, tsc200x_suspend, tsc200x_resume); |
6ac24381 MW |
670 | EXPORT_SYMBOL_GPL(tsc200x_pm_ops); |
671 | ||
672 | MODULE_AUTHOR("Lauri Leukkunen <lauri.leukkunen@nokia.com>"); | |
ef3b98c2 | 673 | MODULE_DESCRIPTION("TSC200x Touchscreen Driver Core"); |
6ac24381 | 674 | MODULE_LICENSE("GPL"); |