Commit | Line | Data |
---|---|---|
37bd4469 LL |
1 | /* |
2 | * TSC2005 touchscreen driver | |
3 | * | |
4 | * Copyright (C) 2006-2010 Nokia Corporation | |
5 | * | |
6 | * Author: Lauri Leukkunen <lauri.leukkunen@nokia.com> | |
7 | * based on TSC2301 driver by Klaus K. Pedersen <klaus.k.pedersen@nokia.com> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
22 | * | |
23 | */ | |
24 | ||
25 | #include <linux/kernel.h> | |
26 | #include <linux/module.h> | |
27 | #include <linux/input.h> | |
a38cfebb | 28 | #include <linux/input/touchscreen.h> |
37bd4469 LL |
29 | #include <linux/interrupt.h> |
30 | #include <linux/delay.h> | |
3ff8ff53 | 31 | #include <linux/pm.h> |
a38cfebb | 32 | #include <linux/of.h> |
37bd4469 LL |
33 | #include <linux/spi/spi.h> |
34 | #include <linux/spi/tsc2005.h> | |
a38cfebb | 35 | #include <linux/regulator/consumer.h> |
273cf48a | 36 | #include <linux/regmap.h> |
d257f298 | 37 | #include <linux/gpio/consumer.h> |
37bd4469 LL |
38 | |
39 | /* | |
40 | * The touchscreen interface operates as follows: | |
41 | * | |
42 | * 1) Pen is pressed against the touchscreen. | |
43 | * 2) TSC2005 performs AD conversion. | |
44 | * 3) After the conversion is done TSC2005 drives DAV line down. | |
45 | * 4) GPIO IRQ is received and tsc2005_irq_thread() is scheduled. | |
46 | * 5) tsc2005_irq_thread() queues up an spi transfer to fetch the x, y, z1, z2 | |
47 | * values. | |
48 | * 6) tsc2005_irq_thread() reports coordinates to input layer and sets up | |
49 | * tsc2005_penup_timer() to be called after TSC2005_PENUP_TIME_MS (40ms). | |
50 | * 7) When the penup timer expires, there have not been touch or DAV interrupts | |
51 | * during the last 40ms which means the pen has been lifted. | |
52 | * | |
53 | * ESD recovery via a hardware reset is done if the TSC2005 doesn't respond | |
54 | * after a configurable period (in ms) of activity. If esd_timeout is 0, the | |
55 | * watchdog is disabled. | |
56 | */ | |
57 | ||
58 | /* control byte 1 */ | |
59 | #define TSC2005_CMD 0x80 | |
60 | #define TSC2005_CMD_NORMAL 0x00 | |
61 | #define TSC2005_CMD_STOP 0x01 | |
62 | #define TSC2005_CMD_12BIT 0x04 | |
63 | ||
64 | /* control byte 0 */ | |
a636df96 SR |
65 | #define TSC2005_REG_READ 0x01 /* R/W access */ |
66 | #define TSC2005_REG_PND0 0x02 /* Power Not Down Control */ | |
67 | #define TSC2005_REG_X (0x0 << 3) | |
68 | #define TSC2005_REG_Y (0x1 << 3) | |
69 | #define TSC2005_REG_Z1 (0x2 << 3) | |
70 | #define TSC2005_REG_Z2 (0x3 << 3) | |
71 | #define TSC2005_REG_AUX (0x4 << 3) | |
72 | #define TSC2005_REG_TEMP1 (0x5 << 3) | |
73 | #define TSC2005_REG_TEMP2 (0x6 << 3) | |
74 | #define TSC2005_REG_STATUS (0x7 << 3) | |
75 | #define TSC2005_REG_AUX_HIGH (0x8 << 3) | |
76 | #define TSC2005_REG_AUX_LOW (0x9 << 3) | |
77 | #define TSC2005_REG_TEMP_HIGH (0xA << 3) | |
78 | #define TSC2005_REG_TEMP_LOW (0xB << 3) | |
79 | #define TSC2005_REG_CFR0 (0xC << 3) | |
80 | #define TSC2005_REG_CFR1 (0xD << 3) | |
81 | #define TSC2005_REG_CFR2 (0xE << 3) | |
82 | #define TSC2005_REG_CONV_FUNC (0xF << 3) | |
37bd4469 LL |
83 | |
84 | /* configuration register 0 */ | |
85 | #define TSC2005_CFR0_PRECHARGE_276US 0x0040 | |
86 | #define TSC2005_CFR0_STABTIME_1MS 0x0300 | |
87 | #define TSC2005_CFR0_CLOCK_1MHZ 0x1000 | |
88 | #define TSC2005_CFR0_RESOLUTION12 0x2000 | |
89 | #define TSC2005_CFR0_PENMODE 0x8000 | |
90 | #define TSC2005_CFR0_INITVALUE (TSC2005_CFR0_STABTIME_1MS | \ | |
91 | TSC2005_CFR0_CLOCK_1MHZ | \ | |
92 | TSC2005_CFR0_RESOLUTION12 | \ | |
93 | TSC2005_CFR0_PRECHARGE_276US | \ | |
94 | TSC2005_CFR0_PENMODE) | |
95 | ||
96 | /* bits common to both read and write of configuration register 0 */ | |
97 | #define TSC2005_CFR0_RW_MASK 0x3fff | |
98 | ||
99 | /* configuration register 1 */ | |
100 | #define TSC2005_CFR1_BATCHDELAY_4MS 0x0003 | |
101 | #define TSC2005_CFR1_INITVALUE TSC2005_CFR1_BATCHDELAY_4MS | |
102 | ||
103 | /* configuration register 2 */ | |
104 | #define TSC2005_CFR2_MAVE_Z 0x0004 | |
105 | #define TSC2005_CFR2_MAVE_Y 0x0008 | |
106 | #define TSC2005_CFR2_MAVE_X 0x0010 | |
107 | #define TSC2005_CFR2_AVG_7 0x0800 | |
108 | #define TSC2005_CFR2_MEDIUM_15 0x3000 | |
109 | #define TSC2005_CFR2_INITVALUE (TSC2005_CFR2_MAVE_X | \ | |
110 | TSC2005_CFR2_MAVE_Y | \ | |
111 | TSC2005_CFR2_MAVE_Z | \ | |
112 | TSC2005_CFR2_MEDIUM_15 | \ | |
113 | TSC2005_CFR2_AVG_7) | |
114 | ||
115 | #define MAX_12BIT 0xfff | |
a38cfebb SR |
116 | #define TSC2005_DEF_X_FUZZ 4 |
117 | #define TSC2005_DEF_Y_FUZZ 8 | |
118 | #define TSC2005_DEF_P_FUZZ 2 | |
119 | #define TSC2005_DEF_RESISTOR 280 | |
120 | ||
37bd4469 LL |
121 | #define TSC2005_SPI_MAX_SPEED_HZ 10000000 |
122 | #define TSC2005_PENUP_TIME_MS 40 | |
123 | ||
273cf48a SR |
124 | static const struct regmap_range tsc2005_writable_ranges[] = { |
125 | regmap_reg_range(TSC2005_REG_AUX_HIGH, TSC2005_REG_CFR2), | |
37bd4469 LL |
126 | }; |
127 | ||
273cf48a SR |
128 | static const struct regmap_access_table tsc2005_writable_table = { |
129 | .yes_ranges = tsc2005_writable_ranges, | |
130 | .n_yes_ranges = ARRAY_SIZE(tsc2005_writable_ranges), | |
131 | }; | |
132 | ||
133 | static struct regmap_config tsc2005_regmap_config = { | |
134 | .reg_bits = 8, | |
135 | .val_bits = 16, | |
136 | .reg_stride = 0x08, | |
137 | .max_register = 0x78, | |
138 | .read_flag_mask = TSC2005_REG_READ, | |
139 | .write_flag_mask = TSC2005_REG_PND0, | |
140 | .wr_table = &tsc2005_writable_table, | |
141 | .use_single_rw = true, | |
142 | }; | |
143 | ||
144 | struct tsc2005_data { | |
145 | u16 x; | |
146 | u16 y; | |
147 | u16 z1; | |
148 | u16 z2; | |
149 | } __packed; | |
150 | #define TSC2005_DATA_REGS 4 | |
151 | ||
37bd4469 LL |
152 | struct tsc2005 { |
153 | struct spi_device *spi; | |
273cf48a | 154 | struct regmap *regmap; |
37bd4469 LL |
155 | |
156 | struct input_dev *idev; | |
157 | char phys[32]; | |
158 | ||
159 | struct mutex mutex; | |
160 | ||
161 | /* raw copy of previous x,y,z */ | |
162 | int in_x; | |
163 | int in_y; | |
164 | int in_z1; | |
165 | int in_z2; | |
166 | ||
80cc2f0c | 167 | spinlock_t lock; |
37bd4469 | 168 | struct timer_list penup_timer; |
37bd4469 LL |
169 | |
170 | unsigned int esd_timeout; | |
0b950d3d DT |
171 | struct delayed_work esd_work; |
172 | unsigned long last_valid_interrupt; | |
37bd4469 LL |
173 | |
174 | unsigned int x_plate_ohm; | |
175 | ||
0b950d3d DT |
176 | bool opened; |
177 | bool suspended; | |
c8b6846a DT |
178 | |
179 | bool pen_down; | |
37bd4469 | 180 | |
a38cfebb SR |
181 | struct regulator *vio; |
182 | ||
d257f298 | 183 | struct gpio_desc *reset_gpio; |
37bd4469 LL |
184 | void (*set_reset)(bool enable); |
185 | }; | |
186 | ||
71f80045 | 187 | static int tsc2005_cmd(struct tsc2005 *ts, u8 cmd) |
37bd4469 | 188 | { |
9a6e180a DT |
189 | u8 tx = TSC2005_CMD | TSC2005_CMD_12BIT | cmd; |
190 | struct spi_transfer xfer = { | |
191 | .tx_buf = &tx, | |
192 | .len = 1, | |
193 | .bits_per_word = 8, | |
194 | }; | |
37bd4469 | 195 | struct spi_message msg; |
71f80045 | 196 | int error; |
37bd4469 LL |
197 | |
198 | spi_message_init(&msg); | |
199 | spi_message_add_tail(&xfer, &msg); | |
71f80045 DT |
200 | |
201 | error = spi_sync(ts->spi, &msg); | |
202 | if (error) { | |
203 | dev_err(&ts->spi->dev, "%s: failed, command: %x, error: %d\n", | |
204 | __func__, cmd, error); | |
205 | return error; | |
206 | } | |
207 | ||
208 | return 0; | |
37bd4469 LL |
209 | } |
210 | ||
37bd4469 LL |
211 | static void tsc2005_update_pen_state(struct tsc2005 *ts, |
212 | int x, int y, int pressure) | |
213 | { | |
214 | if (pressure) { | |
215 | input_report_abs(ts->idev, ABS_X, x); | |
216 | input_report_abs(ts->idev, ABS_Y, y); | |
217 | input_report_abs(ts->idev, ABS_PRESSURE, pressure); | |
218 | if (!ts->pen_down) { | |
219 | input_report_key(ts->idev, BTN_TOUCH, !!pressure); | |
c8b6846a | 220 | ts->pen_down = true; |
37bd4469 LL |
221 | } |
222 | } else { | |
223 | input_report_abs(ts->idev, ABS_PRESSURE, 0); | |
224 | if (ts->pen_down) { | |
225 | input_report_key(ts->idev, BTN_TOUCH, 0); | |
c8b6846a | 226 | ts->pen_down = false; |
37bd4469 LL |
227 | } |
228 | } | |
229 | input_sync(ts->idev); | |
230 | dev_dbg(&ts->spi->dev, "point(%4d,%4d), pressure (%4d)\n", x, y, | |
231 | pressure); | |
232 | } | |
233 | ||
37bd4469 LL |
234 | static irqreturn_t tsc2005_irq_thread(int irq, void *_ts) |
235 | { | |
236 | struct tsc2005 *ts = _ts; | |
80cc2f0c | 237 | unsigned long flags; |
37bd4469 | 238 | unsigned int pressure; |
273cf48a | 239 | struct tsc2005_data tsdata; |
71f80045 | 240 | int error; |
37bd4469 | 241 | |
37bd4469 | 242 | /* read the coordinates */ |
273cf48a SR |
243 | error = regmap_bulk_read(ts->regmap, TSC2005_REG_X, &tsdata, |
244 | TSC2005_DATA_REGS); | |
71f80045 DT |
245 | if (unlikely(error)) |
246 | goto out; | |
247 | ||
37bd4469 | 248 | /* validate position */ |
273cf48a | 249 | if (unlikely(tsdata.x > MAX_12BIT || tsdata.y > MAX_12BIT)) |
37bd4469 LL |
250 | goto out; |
251 | ||
80cc2f0c | 252 | /* Skip reading if the pressure components are out of range */ |
273cf48a SR |
253 | if (unlikely(tsdata.z1 == 0 || tsdata.z2 > MAX_12BIT)) |
254 | goto out; | |
255 | if (unlikely(tsdata.z1 >= tsdata.z2)) | |
37bd4469 LL |
256 | goto out; |
257 | ||
80cc2f0c DT |
258 | /* |
259 | * Skip point if this is a pen down with the exact same values as | |
37bd4469 LL |
260 | * the value before pen-up - that implies SPI fed us stale data |
261 | */ | |
262 | if (!ts->pen_down && | |
273cf48a SR |
263 | ts->in_x == tsdata.x && ts->in_y == tsdata.y && |
264 | ts->in_z1 == tsdata.z1 && ts->in_z2 == tsdata.z2) { | |
37bd4469 | 265 | goto out; |
80cc2f0c | 266 | } |
37bd4469 | 267 | |
80cc2f0c DT |
268 | /* |
269 | * At this point we are happy we have a valid and useful reading. | |
270 | * Remember it for later comparisons. We may now begin downsampling. | |
271 | */ | |
273cf48a SR |
272 | ts->in_x = tsdata.x; |
273 | ts->in_y = tsdata.y; | |
274 | ts->in_z1 = tsdata.z1; | |
275 | ts->in_z2 = tsdata.z2; | |
37bd4469 | 276 | |
80cc2f0c | 277 | /* Compute touch pressure resistance using equation #1 */ |
273cf48a | 278 | pressure = tsdata.x * (tsdata.z2 - tsdata.z1) / tsdata.z1; |
37bd4469 LL |
279 | pressure = pressure * ts->x_plate_ohm / 4096; |
280 | if (unlikely(pressure > MAX_12BIT)) | |
281 | goto out; | |
282 | ||
80cc2f0c DT |
283 | spin_lock_irqsave(&ts->lock, flags); |
284 | ||
273cf48a | 285 | tsc2005_update_pen_state(ts, tsdata.x, tsdata.y, pressure); |
37bd4469 LL |
286 | mod_timer(&ts->penup_timer, |
287 | jiffies + msecs_to_jiffies(TSC2005_PENUP_TIME_MS)); | |
288 | ||
80cc2f0c | 289 | spin_unlock_irqrestore(&ts->lock, flags); |
37bd4469 | 290 | |
0b950d3d | 291 | ts->last_valid_interrupt = jiffies; |
37bd4469 | 292 | out: |
37bd4469 LL |
293 | return IRQ_HANDLED; |
294 | } | |
295 | ||
296 | static void tsc2005_penup_timer(unsigned long data) | |
297 | { | |
298 | struct tsc2005 *ts = (struct tsc2005 *)data; | |
80cc2f0c | 299 | unsigned long flags; |
37bd4469 | 300 | |
80cc2f0c | 301 | spin_lock_irqsave(&ts->lock, flags); |
37bd4469 | 302 | tsc2005_update_pen_state(ts, 0, 0, 0); |
80cc2f0c | 303 | spin_unlock_irqrestore(&ts->lock, flags); |
37bd4469 LL |
304 | } |
305 | ||
306 | static void tsc2005_start_scan(struct tsc2005 *ts) | |
307 | { | |
273cf48a SR |
308 | regmap_write(ts->regmap, TSC2005_REG_CFR0, TSC2005_CFR0_INITVALUE); |
309 | regmap_write(ts->regmap, TSC2005_REG_CFR1, TSC2005_CFR1_INITVALUE); | |
310 | regmap_write(ts->regmap, TSC2005_REG_CFR2, TSC2005_CFR2_INITVALUE); | |
37bd4469 LL |
311 | tsc2005_cmd(ts, TSC2005_CMD_NORMAL); |
312 | } | |
313 | ||
314 | static void tsc2005_stop_scan(struct tsc2005 *ts) | |
315 | { | |
316 | tsc2005_cmd(ts, TSC2005_CMD_STOP); | |
317 | } | |
318 | ||
a38cfebb SR |
319 | static void tsc2005_set_reset(struct tsc2005 *ts, bool enable) |
320 | { | |
d257f298 SR |
321 | if (ts->reset_gpio) |
322 | gpiod_set_value_cansleep(ts->reset_gpio, enable); | |
a38cfebb SR |
323 | else if (ts->set_reset) |
324 | ts->set_reset(enable); | |
325 | } | |
326 | ||
0b950d3d DT |
327 | /* must be called with ts->mutex held */ |
328 | static void __tsc2005_disable(struct tsc2005 *ts) | |
37bd4469 | 329 | { |
0b950d3d DT |
330 | tsc2005_stop_scan(ts); |
331 | ||
37bd4469 | 332 | disable_irq(ts->spi->irq); |
37bd4469 | 333 | del_timer_sync(&ts->penup_timer); |
0b950d3d DT |
334 | |
335 | cancel_delayed_work_sync(&ts->esd_work); | |
336 | ||
337 | enable_irq(ts->spi->irq); | |
37bd4469 LL |
338 | } |
339 | ||
0b950d3d DT |
340 | /* must be called with ts->mutex held */ |
341 | static void __tsc2005_enable(struct tsc2005 *ts) | |
37bd4469 | 342 | { |
37bd4469 | 343 | tsc2005_start_scan(ts); |
0b950d3d | 344 | |
a38cfebb | 345 | if (ts->esd_timeout && (ts->set_reset || ts->reset_gpio)) { |
0b950d3d DT |
346 | ts->last_valid_interrupt = jiffies; |
347 | schedule_delayed_work(&ts->esd_work, | |
90342795 | 348 | round_jiffies_relative( |
0b950d3d DT |
349 | msecs_to_jiffies(ts->esd_timeout))); |
350 | } | |
351 | ||
37bd4469 LL |
352 | } |
353 | ||
37bd4469 LL |
354 | static ssize_t tsc2005_selftest_show(struct device *dev, |
355 | struct device_attribute *attr, | |
356 | char *buf) | |
357 | { | |
80b46aa6 | 358 | struct tsc2005 *ts = dev_get_drvdata(dev); |
273cf48a SR |
359 | unsigned int temp_high; |
360 | unsigned int temp_high_orig; | |
361 | unsigned int temp_high_test; | |
71f80045 DT |
362 | bool success = true; |
363 | int error; | |
37bd4469 | 364 | |
37bd4469 LL |
365 | mutex_lock(&ts->mutex); |
366 | ||
367 | /* | |
368 | * Test TSC2005 communications via temp high register. | |
369 | */ | |
0b950d3d | 370 | __tsc2005_disable(ts); |
71f80045 | 371 | |
273cf48a | 372 | error = regmap_read(ts->regmap, TSC2005_REG_TEMP_HIGH, &temp_high_orig); |
71f80045 DT |
373 | if (error) { |
374 | dev_warn(dev, "selftest failed: read error %d\n", error); | |
375 | success = false; | |
376 | goto out; | |
377 | } | |
378 | ||
37bd4469 | 379 | temp_high_test = (temp_high_orig - 1) & MAX_12BIT; |
71f80045 | 380 | |
273cf48a | 381 | error = regmap_write(ts->regmap, TSC2005_REG_TEMP_HIGH, temp_high_test); |
71f80045 DT |
382 | if (error) { |
383 | dev_warn(dev, "selftest failed: write error %d\n", error); | |
384 | success = false; | |
385 | goto out; | |
386 | } | |
387 | ||
273cf48a | 388 | error = regmap_read(ts->regmap, TSC2005_REG_TEMP_HIGH, &temp_high); |
71f80045 DT |
389 | if (error) { |
390 | dev_warn(dev, "selftest failed: read error %d after write\n", | |
391 | error); | |
392 | success = false; | |
393 | goto out; | |
394 | } | |
395 | ||
37bd4469 LL |
396 | if (temp_high != temp_high_test) { |
397 | dev_warn(dev, "selftest failed: %d != %d\n", | |
398 | temp_high, temp_high_test); | |
71f80045 | 399 | success = false; |
37bd4469 LL |
400 | } |
401 | ||
402 | /* hardware reset */ | |
a38cfebb | 403 | tsc2005_set_reset(ts, false); |
37bd4469 | 404 | usleep_range(100, 500); /* only 10us required */ |
a38cfebb | 405 | tsc2005_set_reset(ts, true); |
71f80045 DT |
406 | |
407 | if (!success) | |
408 | goto out; | |
37bd4469 LL |
409 | |
410 | /* test that the reset really happened */ | |
273cf48a | 411 | error = regmap_read(ts->regmap, TSC2005_REG_TEMP_HIGH, &temp_high); |
71f80045 DT |
412 | if (error) { |
413 | dev_warn(dev, "selftest failed: read error %d after reset\n", | |
414 | error); | |
415 | success = false; | |
416 | goto out; | |
417 | } | |
418 | ||
37bd4469 LL |
419 | if (temp_high != temp_high_orig) { |
420 | dev_warn(dev, "selftest failed after reset: %d != %d\n", | |
421 | temp_high, temp_high_orig); | |
71f80045 | 422 | success = false; |
37bd4469 LL |
423 | } |
424 | ||
71f80045 | 425 | out: |
0b950d3d | 426 | __tsc2005_enable(ts); |
37bd4469 LL |
427 | mutex_unlock(&ts->mutex); |
428 | ||
71f80045 | 429 | return sprintf(buf, "%d\n", success); |
37bd4469 | 430 | } |
8dbcc432 | 431 | |
37bd4469 LL |
432 | static DEVICE_ATTR(selftest, S_IRUGO, tsc2005_selftest_show, NULL); |
433 | ||
8dbcc432 | 434 | static struct attribute *tsc2005_attrs[] = { |
8dbcc432 DT |
435 | &dev_attr_selftest.attr, |
436 | NULL | |
437 | }; | |
438 | ||
587a1f16 | 439 | static umode_t tsc2005_attr_is_visible(struct kobject *kobj, |
8dbcc432 DT |
440 | struct attribute *attr, int n) |
441 | { | |
442 | struct device *dev = container_of(kobj, struct device, kobj); | |
80b46aa6 | 443 | struct tsc2005 *ts = dev_get_drvdata(dev); |
587a1f16 | 444 | umode_t mode = attr->mode; |
8dbcc432 DT |
445 | |
446 | if (attr == &dev_attr_selftest.attr) { | |
a38cfebb | 447 | if (!ts->set_reset && !ts->reset_gpio) |
8dbcc432 DT |
448 | mode = 0; |
449 | } | |
450 | ||
451 | return mode; | |
452 | } | |
453 | ||
454 | static const struct attribute_group tsc2005_attr_group = { | |
455 | .is_visible = tsc2005_attr_is_visible, | |
456 | .attrs = tsc2005_attrs, | |
457 | }; | |
458 | ||
37bd4469 LL |
459 | static void tsc2005_esd_work(struct work_struct *work) |
460 | { | |
0b950d3d | 461 | struct tsc2005 *ts = container_of(work, struct tsc2005, esd_work.work); |
71f80045 | 462 | int error; |
273cf48a | 463 | unsigned int r; |
37bd4469 | 464 | |
a0fa2206 AK |
465 | if (!mutex_trylock(&ts->mutex)) { |
466 | /* | |
467 | * If the mutex is taken, it means that disable or enable is in | |
468 | * progress. In that case just reschedule the work. If the work | |
469 | * is not needed, it will be canceled by disable. | |
470 | */ | |
471 | goto reschedule; | |
472 | } | |
37bd4469 | 473 | |
0b950d3d DT |
474 | if (time_is_after_jiffies(ts->last_valid_interrupt + |
475 | msecs_to_jiffies(ts->esd_timeout))) | |
37bd4469 LL |
476 | goto out; |
477 | ||
0b950d3d | 478 | /* We should be able to read register without disabling interrupts. */ |
273cf48a | 479 | error = regmap_read(ts->regmap, TSC2005_REG_CFR0, &r); |
0b950d3d DT |
480 | if (!error && |
481 | !((r ^ TSC2005_CFR0_INITVALUE) & TSC2005_CFR0_RW_MASK)) { | |
482 | goto out; | |
37bd4469 LL |
483 | } |
484 | ||
0b950d3d DT |
485 | /* |
486 | * If we could not read our known value from configuration register 0 | |
487 | * then we should reset the controller as if from power-up and start | |
488 | * scanning again. | |
489 | */ | |
490 | dev_info(&ts->spi->dev, "TSC2005 not responding - resetting\n"); | |
491 | ||
492 | disable_irq(ts->spi->irq); | |
493 | del_timer_sync(&ts->penup_timer); | |
494 | ||
495 | tsc2005_update_pen_state(ts, 0, 0, 0); | |
496 | ||
a38cfebb | 497 | tsc2005_set_reset(ts, false); |
0b950d3d | 498 | usleep_range(100, 500); /* only 10us required */ |
a38cfebb | 499 | tsc2005_set_reset(ts, true); |
0b950d3d DT |
500 | |
501 | enable_irq(ts->spi->irq); | |
502 | tsc2005_start_scan(ts); | |
37bd4469 LL |
503 | |
504 | out: | |
a0fa2206 AK |
505 | mutex_unlock(&ts->mutex); |
506 | reschedule: | |
0b950d3d DT |
507 | /* re-arm the watchdog */ |
508 | schedule_delayed_work(&ts->esd_work, | |
90342795 | 509 | round_jiffies_relative( |
0b950d3d | 510 | msecs_to_jiffies(ts->esd_timeout))); |
0b950d3d DT |
511 | } |
512 | ||
513 | static int tsc2005_open(struct input_dev *input) | |
514 | { | |
515 | struct tsc2005 *ts = input_get_drvdata(input); | |
516 | ||
517 | mutex_lock(&ts->mutex); | |
518 | ||
5cb81d19 | 519 | if (!ts->suspended) |
0b950d3d DT |
520 | __tsc2005_enable(ts); |
521 | ||
522 | ts->opened = true; | |
523 | ||
524 | mutex_unlock(&ts->mutex); | |
525 | ||
526 | return 0; | |
527 | } | |
528 | ||
529 | static void tsc2005_close(struct input_dev *input) | |
530 | { | |
531 | struct tsc2005 *ts = input_get_drvdata(input); | |
532 | ||
533 | mutex_lock(&ts->mutex); | |
534 | ||
5cb81d19 | 535 | if (!ts->suspended) |
0b950d3d DT |
536 | __tsc2005_disable(ts); |
537 | ||
538 | ts->opened = false; | |
539 | ||
37bd4469 LL |
540 | mutex_unlock(&ts->mutex); |
541 | } | |
542 | ||
5298cc4c | 543 | static int tsc2005_probe(struct spi_device *spi) |
37bd4469 | 544 | { |
c838cb3d | 545 | const struct tsc2005_platform_data *pdata = dev_get_platdata(&spi->dev); |
a38cfebb SR |
546 | struct device_node *np = spi->dev.of_node; |
547 | ||
99bb892d DT |
548 | struct tsc2005 *ts; |
549 | struct input_dev *input_dev; | |
a38cfebb SR |
550 | unsigned int max_x = MAX_12BIT; |
551 | unsigned int max_y = MAX_12BIT; | |
552 | unsigned int max_p = MAX_12BIT; | |
553 | unsigned int fudge_x = TSC2005_DEF_X_FUZZ; | |
554 | unsigned int fudge_y = TSC2005_DEF_Y_FUZZ; | |
555 | unsigned int fudge_p = TSC2005_DEF_P_FUZZ; | |
556 | unsigned int x_plate_ohm = TSC2005_DEF_RESISTOR; | |
557 | unsigned int esd_timeout; | |
99bb892d | 558 | int error; |
37bd4469 | 559 | |
a38cfebb | 560 | if (!np && !pdata) { |
6e51c857 | 561 | dev_err(&spi->dev, "no platform data\n"); |
99bb892d DT |
562 | return -ENODEV; |
563 | } | |
37bd4469 | 564 | |
99bb892d | 565 | if (spi->irq <= 0) { |
6e51c857 | 566 | dev_err(&spi->dev, "no irq\n"); |
99bb892d DT |
567 | return -ENODEV; |
568 | } | |
37bd4469 | 569 | |
a38cfebb SR |
570 | if (pdata) { |
571 | fudge_x = pdata->ts_x_fudge; | |
572 | fudge_y = pdata->ts_y_fudge; | |
573 | fudge_p = pdata->ts_pressure_fudge; | |
574 | max_x = pdata->ts_x_max; | |
575 | max_y = pdata->ts_y_max; | |
576 | max_p = pdata->ts_pressure_max; | |
577 | x_plate_ohm = pdata->ts_x_plate_ohm; | |
578 | esd_timeout = pdata->esd_timeout_ms; | |
579 | } else { | |
580 | x_plate_ohm = TSC2005_DEF_RESISTOR; | |
581 | of_property_read_u32(np, "ti,x-plate-ohms", &x_plate_ohm); | |
582 | esd_timeout = 0; | |
583 | of_property_read_u32(np, "ti,esd-recovery-timeout-ms", | |
584 | &esd_timeout); | |
585 | } | |
586 | ||
99bb892d DT |
587 | spi->mode = SPI_MODE_0; |
588 | spi->bits_per_word = 8; | |
589 | if (!spi->max_speed_hz) | |
590 | spi->max_speed_hz = TSC2005_SPI_MAX_SPEED_HZ; | |
37bd4469 | 591 | |
99bb892d DT |
592 | error = spi_setup(spi); |
593 | if (error) | |
594 | return error; | |
37bd4469 | 595 | |
99e8325f SR |
596 | ts = devm_kzalloc(&spi->dev, sizeof(*ts), GFP_KERNEL); |
597 | if (!ts) | |
598 | return -ENOMEM; | |
599 | ||
600 | input_dev = devm_input_allocate_device(&spi->dev); | |
601 | if (!input_dev) | |
602 | return -ENOMEM; | |
37bd4469 | 603 | |
99bb892d DT |
604 | ts->spi = spi; |
605 | ts->idev = input_dev; | |
606 | ||
273cf48a SR |
607 | ts->regmap = devm_regmap_init_spi(spi, &tsc2005_regmap_config); |
608 | if (IS_ERR(ts->regmap)) | |
609 | return PTR_ERR(ts->regmap); | |
610 | ||
a38cfebb SR |
611 | ts->x_plate_ohm = x_plate_ohm; |
612 | ts->esd_timeout = esd_timeout; | |
613 | ||
d257f298 SR |
614 | ts->reset_gpio = devm_gpiod_get_optional(&spi->dev, "reset", |
615 | GPIOD_OUT_HIGH); | |
616 | if (IS_ERR(ts->reset_gpio)) { | |
617 | error = PTR_ERR(ts->reset_gpio); | |
618 | dev_err(&spi->dev, "error acquiring reset gpio: %d\n", error); | |
619 | return error; | |
620 | } | |
a38cfebb | 621 | |
d257f298 SR |
622 | ts->vio = devm_regulator_get_optional(&spi->dev, "vio"); |
623 | if (IS_ERR(ts->vio)) { | |
624 | error = PTR_ERR(ts->vio); | |
625 | dev_err(&spi->dev, "vio regulator missing (%d)", error); | |
626 | return error; | |
627 | } | |
a38cfebb | 628 | |
d257f298 | 629 | if (!ts->reset_gpio && pdata) |
a38cfebb | 630 | ts->set_reset = pdata->set_reset; |
37bd4469 | 631 | |
99bb892d | 632 | mutex_init(&ts->mutex); |
37bd4469 | 633 | |
80cc2f0c | 634 | spin_lock_init(&ts->lock); |
99bb892d | 635 | setup_timer(&ts->penup_timer, tsc2005_penup_timer, (unsigned long)ts); |
37bd4469 | 636 | |
0b950d3d | 637 | INIT_DELAYED_WORK(&ts->esd_work, tsc2005_esd_work); |
37bd4469 | 638 | |
99bb892d DT |
639 | snprintf(ts->phys, sizeof(ts->phys), |
640 | "%s/input-ts", dev_name(&spi->dev)); | |
641 | ||
642 | input_dev->name = "TSC2005 touchscreen"; | |
643 | input_dev->phys = ts->phys; | |
644 | input_dev->id.bustype = BUS_SPI; | |
645 | input_dev->dev.parent = &spi->dev; | |
646 | input_dev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY); | |
647 | input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); | |
648 | ||
649 | input_set_abs_params(input_dev, ABS_X, 0, max_x, fudge_x, 0); | |
650 | input_set_abs_params(input_dev, ABS_Y, 0, max_y, fudge_y, 0); | |
651 | input_set_abs_params(input_dev, ABS_PRESSURE, 0, max_p, fudge_p, 0); | |
652 | ||
a38cfebb | 653 | if (np) |
4200e831 | 654 | touchscreen_parse_properties(input_dev, false); |
a38cfebb | 655 | |
0b950d3d DT |
656 | input_dev->open = tsc2005_open; |
657 | input_dev->close = tsc2005_close; | |
658 | ||
659 | input_set_drvdata(input_dev, ts); | |
660 | ||
661 | /* Ensure the touchscreen is off */ | |
662 | tsc2005_stop_scan(ts); | |
663 | ||
99e8325f SR |
664 | error = devm_request_threaded_irq(&spi->dev, spi->irq, NULL, |
665 | tsc2005_irq_thread, | |
666 | IRQF_TRIGGER_RISING | IRQF_ONESHOT, | |
667 | "tsc2005", ts); | |
99bb892d DT |
668 | if (error) { |
669 | dev_err(&spi->dev, "Failed to request irq, err: %d\n", error); | |
99e8325f | 670 | return error; |
37bd4469 LL |
671 | } |
672 | ||
a38cfebb SR |
673 | /* enable regulator for DT */ |
674 | if (ts->vio) { | |
675 | error = regulator_enable(ts->vio); | |
676 | if (error) | |
677 | return error; | |
678 | } | |
679 | ||
80b46aa6 | 680 | dev_set_drvdata(&spi->dev, ts); |
99bb892d DT |
681 | error = sysfs_create_group(&spi->dev.kobj, &tsc2005_attr_group); |
682 | if (error) { | |
683 | dev_err(&spi->dev, | |
684 | "Failed to create sysfs attributes, err: %d\n", error); | |
a38cfebb | 685 | goto disable_regulator; |
37bd4469 LL |
686 | } |
687 | ||
99bb892d DT |
688 | error = input_register_device(ts->idev); |
689 | if (error) { | |
690 | dev_err(&spi->dev, | |
691 | "Failed to register input device, err: %d\n", error); | |
692 | goto err_remove_sysfs; | |
693 | } | |
37bd4469 | 694 | |
ddca6a31 | 695 | irq_set_irq_wake(spi->irq, 1); |
99bb892d DT |
696 | return 0; |
697 | ||
698 | err_remove_sysfs: | |
699 | sysfs_remove_group(&spi->dev.kobj, &tsc2005_attr_group); | |
a38cfebb SR |
700 | disable_regulator: |
701 | if (ts->vio) | |
702 | regulator_disable(ts->vio); | |
99bb892d | 703 | return error; |
37bd4469 LL |
704 | } |
705 | ||
e2619cf7 | 706 | static int tsc2005_remove(struct spi_device *spi) |
37bd4469 | 707 | { |
80b46aa6 | 708 | struct tsc2005 *ts = dev_get_drvdata(&spi->dev); |
a38cfebb | 709 | |
99e8325f | 710 | sysfs_remove_group(&spi->dev.kobj, &tsc2005_attr_group); |
37bd4469 | 711 | |
a38cfebb SR |
712 | if (ts->vio) |
713 | regulator_disable(ts->vio); | |
714 | ||
37bd4469 LL |
715 | return 0; |
716 | } | |
717 | ||
02b6a58b | 718 | static int __maybe_unused tsc2005_suspend(struct device *dev) |
37bd4469 | 719 | { |
80b46aa6 | 720 | struct tsc2005 *ts = dev_get_drvdata(dev); |
37bd4469 LL |
721 | |
722 | mutex_lock(&ts->mutex); | |
0b950d3d | 723 | |
5cb81d19 | 724 | if (!ts->suspended && ts->opened) |
0b950d3d DT |
725 | __tsc2005_disable(ts); |
726 | ||
727 | ts->suspended = true; | |
728 | ||
37bd4469 LL |
729 | mutex_unlock(&ts->mutex); |
730 | ||
731 | return 0; | |
732 | } | |
733 | ||
02b6a58b | 734 | static int __maybe_unused tsc2005_resume(struct device *dev) |
37bd4469 | 735 | { |
80b46aa6 | 736 | struct tsc2005 *ts = dev_get_drvdata(dev); |
37bd4469 LL |
737 | |
738 | mutex_lock(&ts->mutex); | |
0b950d3d | 739 | |
5cb81d19 | 740 | if (ts->suspended && ts->opened) |
0b950d3d DT |
741 | __tsc2005_enable(ts); |
742 | ||
743 | ts->suspended = false; | |
744 | ||
37bd4469 LL |
745 | mutex_unlock(&ts->mutex); |
746 | ||
747 | return 0; | |
748 | } | |
37bd4469 | 749 | |
3ff8ff53 DT |
750 | static SIMPLE_DEV_PM_OPS(tsc2005_pm_ops, tsc2005_suspend, tsc2005_resume); |
751 | ||
37bd4469 | 752 | static struct spi_driver tsc2005_driver = { |
3ff8ff53 DT |
753 | .driver = { |
754 | .name = "tsc2005", | |
755 | .owner = THIS_MODULE, | |
756 | .pm = &tsc2005_pm_ops, | |
37bd4469 | 757 | }, |
3ff8ff53 | 758 | .probe = tsc2005_probe, |
1cb0aa88 | 759 | .remove = tsc2005_remove, |
37bd4469 LL |
760 | }; |
761 | ||
ca83922e | 762 | module_spi_driver(tsc2005_driver); |
37bd4469 LL |
763 | |
764 | MODULE_AUTHOR("Lauri Leukkunen <lauri.leukkunen@nokia.com>"); | |
b88aa494 | 765 | MODULE_DESCRIPTION("TSC2005 Touchscreen Driver"); |
37bd4469 | 766 | MODULE_LICENSE("GPL"); |
938789fe | 767 | MODULE_ALIAS("spi:tsc2005"); |