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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 SR |
32 | #include <linux/of.h> |
33 | #include <linux/of_gpio.h> | |
37bd4469 LL |
34 | #include <linux/spi/spi.h> |
35 | #include <linux/spi/tsc2005.h> | |
a38cfebb | 36 | #include <linux/regulator/consumer.h> |
37bd4469 LL |
37 | |
38 | /* | |
39 | * The touchscreen interface operates as follows: | |
40 | * | |
41 | * 1) Pen is pressed against the touchscreen. | |
42 | * 2) TSC2005 performs AD conversion. | |
43 | * 3) After the conversion is done TSC2005 drives DAV line down. | |
44 | * 4) GPIO IRQ is received and tsc2005_irq_thread() is scheduled. | |
45 | * 5) tsc2005_irq_thread() queues up an spi transfer to fetch the x, y, z1, z2 | |
46 | * values. | |
47 | * 6) tsc2005_irq_thread() reports coordinates to input layer and sets up | |
48 | * tsc2005_penup_timer() to be called after TSC2005_PENUP_TIME_MS (40ms). | |
49 | * 7) When the penup timer expires, there have not been touch or DAV interrupts | |
50 | * during the last 40ms which means the pen has been lifted. | |
51 | * | |
52 | * ESD recovery via a hardware reset is done if the TSC2005 doesn't respond | |
53 | * after a configurable period (in ms) of activity. If esd_timeout is 0, the | |
54 | * watchdog is disabled. | |
55 | */ | |
56 | ||
57 | /* control byte 1 */ | |
58 | #define TSC2005_CMD 0x80 | |
59 | #define TSC2005_CMD_NORMAL 0x00 | |
60 | #define TSC2005_CMD_STOP 0x01 | |
61 | #define TSC2005_CMD_12BIT 0x04 | |
62 | ||
63 | /* control byte 0 */ | |
64 | #define TSC2005_REG_READ 0x0001 | |
65 | #define TSC2005_REG_PND0 0x0002 | |
66 | #define TSC2005_REG_X 0x0000 | |
67 | #define TSC2005_REG_Y 0x0008 | |
68 | #define TSC2005_REG_Z1 0x0010 | |
69 | #define TSC2005_REG_Z2 0x0018 | |
70 | #define TSC2005_REG_TEMP_HIGH 0x0050 | |
71 | #define TSC2005_REG_CFR0 0x0060 | |
72 | #define TSC2005_REG_CFR1 0x0068 | |
73 | #define TSC2005_REG_CFR2 0x0070 | |
74 | ||
75 | /* configuration register 0 */ | |
76 | #define TSC2005_CFR0_PRECHARGE_276US 0x0040 | |
77 | #define TSC2005_CFR0_STABTIME_1MS 0x0300 | |
78 | #define TSC2005_CFR0_CLOCK_1MHZ 0x1000 | |
79 | #define TSC2005_CFR0_RESOLUTION12 0x2000 | |
80 | #define TSC2005_CFR0_PENMODE 0x8000 | |
81 | #define TSC2005_CFR0_INITVALUE (TSC2005_CFR0_STABTIME_1MS | \ | |
82 | TSC2005_CFR0_CLOCK_1MHZ | \ | |
83 | TSC2005_CFR0_RESOLUTION12 | \ | |
84 | TSC2005_CFR0_PRECHARGE_276US | \ | |
85 | TSC2005_CFR0_PENMODE) | |
86 | ||
87 | /* bits common to both read and write of configuration register 0 */ | |
88 | #define TSC2005_CFR0_RW_MASK 0x3fff | |
89 | ||
90 | /* configuration register 1 */ | |
91 | #define TSC2005_CFR1_BATCHDELAY_4MS 0x0003 | |
92 | #define TSC2005_CFR1_INITVALUE TSC2005_CFR1_BATCHDELAY_4MS | |
93 | ||
94 | /* configuration register 2 */ | |
95 | #define TSC2005_CFR2_MAVE_Z 0x0004 | |
96 | #define TSC2005_CFR2_MAVE_Y 0x0008 | |
97 | #define TSC2005_CFR2_MAVE_X 0x0010 | |
98 | #define TSC2005_CFR2_AVG_7 0x0800 | |
99 | #define TSC2005_CFR2_MEDIUM_15 0x3000 | |
100 | #define TSC2005_CFR2_INITVALUE (TSC2005_CFR2_MAVE_X | \ | |
101 | TSC2005_CFR2_MAVE_Y | \ | |
102 | TSC2005_CFR2_MAVE_Z | \ | |
103 | TSC2005_CFR2_MEDIUM_15 | \ | |
104 | TSC2005_CFR2_AVG_7) | |
105 | ||
106 | #define MAX_12BIT 0xfff | |
a38cfebb SR |
107 | #define TSC2005_DEF_X_FUZZ 4 |
108 | #define TSC2005_DEF_Y_FUZZ 8 | |
109 | #define TSC2005_DEF_P_FUZZ 2 | |
110 | #define TSC2005_DEF_RESISTOR 280 | |
111 | ||
37bd4469 LL |
112 | #define TSC2005_SPI_MAX_SPEED_HZ 10000000 |
113 | #define TSC2005_PENUP_TIME_MS 40 | |
114 | ||
115 | struct tsc2005_spi_rd { | |
116 | struct spi_transfer spi_xfer; | |
117 | u32 spi_tx; | |
118 | u32 spi_rx; | |
119 | }; | |
120 | ||
121 | struct tsc2005 { | |
122 | struct spi_device *spi; | |
123 | ||
124 | struct spi_message spi_read_msg; | |
125 | struct tsc2005_spi_rd spi_x; | |
126 | struct tsc2005_spi_rd spi_y; | |
127 | struct tsc2005_spi_rd spi_z1; | |
128 | struct tsc2005_spi_rd spi_z2; | |
129 | ||
130 | struct input_dev *idev; | |
131 | char phys[32]; | |
132 | ||
133 | struct mutex mutex; | |
134 | ||
135 | /* raw copy of previous x,y,z */ | |
136 | int in_x; | |
137 | int in_y; | |
138 | int in_z1; | |
139 | int in_z2; | |
140 | ||
80cc2f0c | 141 | spinlock_t lock; |
37bd4469 | 142 | struct timer_list penup_timer; |
37bd4469 LL |
143 | |
144 | unsigned int esd_timeout; | |
0b950d3d DT |
145 | struct delayed_work esd_work; |
146 | unsigned long last_valid_interrupt; | |
37bd4469 LL |
147 | |
148 | unsigned int x_plate_ohm; | |
149 | ||
0b950d3d DT |
150 | bool opened; |
151 | bool suspended; | |
c8b6846a DT |
152 | |
153 | bool pen_down; | |
37bd4469 | 154 | |
a38cfebb SR |
155 | struct regulator *vio; |
156 | ||
157 | int reset_gpio; | |
37bd4469 LL |
158 | void (*set_reset)(bool enable); |
159 | }; | |
160 | ||
71f80045 | 161 | static int tsc2005_cmd(struct tsc2005 *ts, u8 cmd) |
37bd4469 | 162 | { |
9a6e180a DT |
163 | u8 tx = TSC2005_CMD | TSC2005_CMD_12BIT | cmd; |
164 | struct spi_transfer xfer = { | |
165 | .tx_buf = &tx, | |
166 | .len = 1, | |
167 | .bits_per_word = 8, | |
168 | }; | |
37bd4469 | 169 | struct spi_message msg; |
71f80045 | 170 | int error; |
37bd4469 LL |
171 | |
172 | spi_message_init(&msg); | |
173 | spi_message_add_tail(&xfer, &msg); | |
71f80045 DT |
174 | |
175 | error = spi_sync(ts->spi, &msg); | |
176 | if (error) { | |
177 | dev_err(&ts->spi->dev, "%s: failed, command: %x, error: %d\n", | |
178 | __func__, cmd, error); | |
179 | return error; | |
180 | } | |
181 | ||
182 | return 0; | |
37bd4469 LL |
183 | } |
184 | ||
71f80045 | 185 | static int tsc2005_write(struct tsc2005 *ts, u8 reg, u16 value) |
37bd4469 | 186 | { |
9a6e180a DT |
187 | u32 tx = ((reg | TSC2005_REG_PND0) << 16) | value; |
188 | struct spi_transfer xfer = { | |
189 | .tx_buf = &tx, | |
190 | .len = 4, | |
191 | .bits_per_word = 24, | |
192 | }; | |
37bd4469 | 193 | struct spi_message msg; |
71f80045 | 194 | int error; |
37bd4469 LL |
195 | |
196 | spi_message_init(&msg); | |
197 | spi_message_add_tail(&xfer, &msg); | |
71f80045 DT |
198 | |
199 | error = spi_sync(ts->spi, &msg); | |
200 | if (error) { | |
201 | dev_err(&ts->spi->dev, | |
202 | "%s: failed, register: %x, value: %x, error: %d\n", | |
203 | __func__, reg, value, error); | |
204 | return error; | |
205 | } | |
206 | ||
207 | return 0; | |
37bd4469 LL |
208 | } |
209 | ||
210 | static void tsc2005_setup_read(struct tsc2005_spi_rd *rd, u8 reg, bool last) | |
211 | { | |
9a6e180a DT |
212 | memset(rd, 0, sizeof(*rd)); |
213 | ||
37bd4469 LL |
214 | rd->spi_tx = (reg | TSC2005_REG_READ) << 16; |
215 | rd->spi_xfer.tx_buf = &rd->spi_tx; | |
216 | rd->spi_xfer.rx_buf = &rd->spi_rx; | |
217 | rd->spi_xfer.len = 4; | |
218 | rd->spi_xfer.bits_per_word = 24; | |
219 | rd->spi_xfer.cs_change = !last; | |
220 | } | |
221 | ||
71f80045 | 222 | static int tsc2005_read(struct tsc2005 *ts, u8 reg, u16 *value) |
37bd4469 | 223 | { |
9a6e180a | 224 | struct tsc2005_spi_rd spi_rd; |
37bd4469 | 225 | struct spi_message msg; |
71f80045 | 226 | int error; |
37bd4469 | 227 | |
c8b6846a | 228 | tsc2005_setup_read(&spi_rd, reg, true); |
37bd4469 LL |
229 | |
230 | spi_message_init(&msg); | |
231 | spi_message_add_tail(&spi_rd.spi_xfer, &msg); | |
71f80045 DT |
232 | |
233 | error = spi_sync(ts->spi, &msg); | |
234 | if (error) | |
235 | return error; | |
9a6e180a | 236 | |
37bd4469 | 237 | *value = spi_rd.spi_rx; |
71f80045 | 238 | return 0; |
37bd4469 LL |
239 | } |
240 | ||
241 | static void tsc2005_update_pen_state(struct tsc2005 *ts, | |
242 | int x, int y, int pressure) | |
243 | { | |
244 | if (pressure) { | |
245 | input_report_abs(ts->idev, ABS_X, x); | |
246 | input_report_abs(ts->idev, ABS_Y, y); | |
247 | input_report_abs(ts->idev, ABS_PRESSURE, pressure); | |
248 | if (!ts->pen_down) { | |
249 | input_report_key(ts->idev, BTN_TOUCH, !!pressure); | |
c8b6846a | 250 | ts->pen_down = true; |
37bd4469 LL |
251 | } |
252 | } else { | |
253 | input_report_abs(ts->idev, ABS_PRESSURE, 0); | |
254 | if (ts->pen_down) { | |
255 | input_report_key(ts->idev, BTN_TOUCH, 0); | |
c8b6846a | 256 | ts->pen_down = false; |
37bd4469 LL |
257 | } |
258 | } | |
259 | input_sync(ts->idev); | |
260 | dev_dbg(&ts->spi->dev, "point(%4d,%4d), pressure (%4d)\n", x, y, | |
261 | pressure); | |
262 | } | |
263 | ||
37bd4469 LL |
264 | static irqreturn_t tsc2005_irq_thread(int irq, void *_ts) |
265 | { | |
266 | struct tsc2005 *ts = _ts; | |
80cc2f0c | 267 | unsigned long flags; |
37bd4469 | 268 | unsigned int pressure; |
80cc2f0c DT |
269 | u32 x, y; |
270 | u32 z1, z2; | |
71f80045 | 271 | int error; |
37bd4469 | 272 | |
37bd4469 | 273 | /* read the coordinates */ |
71f80045 DT |
274 | error = spi_sync(ts->spi, &ts->spi_read_msg); |
275 | if (unlikely(error)) | |
276 | goto out; | |
277 | ||
37bd4469 LL |
278 | x = ts->spi_x.spi_rx; |
279 | y = ts->spi_y.spi_rx; | |
280 | z1 = ts->spi_z1.spi_rx; | |
281 | z2 = ts->spi_z2.spi_rx; | |
282 | ||
283 | /* validate position */ | |
284 | if (unlikely(x > MAX_12BIT || y > MAX_12BIT)) | |
285 | goto out; | |
286 | ||
80cc2f0c | 287 | /* Skip reading if the pressure components are out of range */ |
37bd4469 LL |
288 | if (unlikely(z1 == 0 || z2 > MAX_12BIT || z1 >= z2)) |
289 | goto out; | |
290 | ||
80cc2f0c DT |
291 | /* |
292 | * Skip point if this is a pen down with the exact same values as | |
37bd4469 LL |
293 | * the value before pen-up - that implies SPI fed us stale data |
294 | */ | |
295 | if (!ts->pen_down && | |
80cc2f0c DT |
296 | ts->in_x == x && ts->in_y == y && |
297 | ts->in_z1 == z1 && ts->in_z2 == z2) { | |
37bd4469 | 298 | goto out; |
80cc2f0c | 299 | } |
37bd4469 | 300 | |
80cc2f0c DT |
301 | /* |
302 | * At this point we are happy we have a valid and useful reading. | |
303 | * Remember it for later comparisons. We may now begin downsampling. | |
304 | */ | |
37bd4469 LL |
305 | ts->in_x = x; |
306 | ts->in_y = y; | |
307 | ts->in_z1 = z1; | |
308 | ts->in_z2 = z2; | |
309 | ||
80cc2f0c | 310 | /* Compute touch pressure resistance using equation #1 */ |
37bd4469 LL |
311 | pressure = x * (z2 - z1) / z1; |
312 | pressure = pressure * ts->x_plate_ohm / 4096; | |
313 | if (unlikely(pressure > MAX_12BIT)) | |
314 | goto out; | |
315 | ||
80cc2f0c DT |
316 | spin_lock_irqsave(&ts->lock, flags); |
317 | ||
37bd4469 | 318 | tsc2005_update_pen_state(ts, x, y, pressure); |
37bd4469 LL |
319 | mod_timer(&ts->penup_timer, |
320 | jiffies + msecs_to_jiffies(TSC2005_PENUP_TIME_MS)); | |
321 | ||
80cc2f0c | 322 | spin_unlock_irqrestore(&ts->lock, flags); |
37bd4469 | 323 | |
0b950d3d | 324 | ts->last_valid_interrupt = jiffies; |
37bd4469 | 325 | out: |
37bd4469 LL |
326 | return IRQ_HANDLED; |
327 | } | |
328 | ||
329 | static void tsc2005_penup_timer(unsigned long data) | |
330 | { | |
331 | struct tsc2005 *ts = (struct tsc2005 *)data; | |
80cc2f0c | 332 | unsigned long flags; |
37bd4469 | 333 | |
80cc2f0c | 334 | spin_lock_irqsave(&ts->lock, flags); |
37bd4469 | 335 | tsc2005_update_pen_state(ts, 0, 0, 0); |
80cc2f0c | 336 | spin_unlock_irqrestore(&ts->lock, flags); |
37bd4469 LL |
337 | } |
338 | ||
339 | static void tsc2005_start_scan(struct tsc2005 *ts) | |
340 | { | |
341 | tsc2005_write(ts, TSC2005_REG_CFR0, TSC2005_CFR0_INITVALUE); | |
342 | tsc2005_write(ts, TSC2005_REG_CFR1, TSC2005_CFR1_INITVALUE); | |
343 | tsc2005_write(ts, TSC2005_REG_CFR2, TSC2005_CFR2_INITVALUE); | |
344 | tsc2005_cmd(ts, TSC2005_CMD_NORMAL); | |
345 | } | |
346 | ||
347 | static void tsc2005_stop_scan(struct tsc2005 *ts) | |
348 | { | |
349 | tsc2005_cmd(ts, TSC2005_CMD_STOP); | |
350 | } | |
351 | ||
a38cfebb SR |
352 | static void tsc2005_set_reset(struct tsc2005 *ts, bool enable) |
353 | { | |
354 | if (ts->reset_gpio >= 0) | |
355 | gpio_set_value(ts->reset_gpio, enable); | |
356 | else if (ts->set_reset) | |
357 | ts->set_reset(enable); | |
358 | } | |
359 | ||
0b950d3d DT |
360 | /* must be called with ts->mutex held */ |
361 | static void __tsc2005_disable(struct tsc2005 *ts) | |
37bd4469 | 362 | { |
0b950d3d DT |
363 | tsc2005_stop_scan(ts); |
364 | ||
37bd4469 | 365 | disable_irq(ts->spi->irq); |
37bd4469 | 366 | del_timer_sync(&ts->penup_timer); |
0b950d3d DT |
367 | |
368 | cancel_delayed_work_sync(&ts->esd_work); | |
369 | ||
370 | enable_irq(ts->spi->irq); | |
37bd4469 LL |
371 | } |
372 | ||
0b950d3d DT |
373 | /* must be called with ts->mutex held */ |
374 | static void __tsc2005_enable(struct tsc2005 *ts) | |
37bd4469 | 375 | { |
37bd4469 | 376 | tsc2005_start_scan(ts); |
0b950d3d | 377 | |
a38cfebb | 378 | if (ts->esd_timeout && (ts->set_reset || ts->reset_gpio)) { |
0b950d3d DT |
379 | ts->last_valid_interrupt = jiffies; |
380 | schedule_delayed_work(&ts->esd_work, | |
90342795 | 381 | round_jiffies_relative( |
0b950d3d DT |
382 | msecs_to_jiffies(ts->esd_timeout))); |
383 | } | |
384 | ||
37bd4469 LL |
385 | } |
386 | ||
37bd4469 LL |
387 | static ssize_t tsc2005_selftest_show(struct device *dev, |
388 | struct device_attribute *attr, | |
389 | char *buf) | |
390 | { | |
6b007d62 DT |
391 | struct spi_device *spi = to_spi_device(dev); |
392 | struct tsc2005 *ts = spi_get_drvdata(spi); | |
37bd4469 LL |
393 | u16 temp_high; |
394 | u16 temp_high_orig; | |
395 | u16 temp_high_test; | |
71f80045 DT |
396 | bool success = true; |
397 | int error; | |
37bd4469 | 398 | |
37bd4469 LL |
399 | mutex_lock(&ts->mutex); |
400 | ||
401 | /* | |
402 | * Test TSC2005 communications via temp high register. | |
403 | */ | |
0b950d3d | 404 | __tsc2005_disable(ts); |
71f80045 DT |
405 | |
406 | error = tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high_orig); | |
407 | if (error) { | |
408 | dev_warn(dev, "selftest failed: read error %d\n", error); | |
409 | success = false; | |
410 | goto out; | |
411 | } | |
412 | ||
37bd4469 | 413 | temp_high_test = (temp_high_orig - 1) & MAX_12BIT; |
71f80045 DT |
414 | |
415 | error = tsc2005_write(ts, TSC2005_REG_TEMP_HIGH, temp_high_test); | |
416 | if (error) { | |
417 | dev_warn(dev, "selftest failed: write error %d\n", error); | |
418 | success = false; | |
419 | goto out; | |
420 | } | |
421 | ||
422 | error = tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high); | |
423 | if (error) { | |
424 | dev_warn(dev, "selftest failed: read error %d after write\n", | |
425 | error); | |
426 | success = false; | |
427 | goto out; | |
428 | } | |
429 | ||
37bd4469 LL |
430 | if (temp_high != temp_high_test) { |
431 | dev_warn(dev, "selftest failed: %d != %d\n", | |
432 | temp_high, temp_high_test); | |
71f80045 | 433 | success = false; |
37bd4469 LL |
434 | } |
435 | ||
436 | /* hardware reset */ | |
a38cfebb | 437 | tsc2005_set_reset(ts, false); |
37bd4469 | 438 | usleep_range(100, 500); /* only 10us required */ |
a38cfebb | 439 | tsc2005_set_reset(ts, true); |
71f80045 DT |
440 | |
441 | if (!success) | |
442 | goto out; | |
37bd4469 LL |
443 | |
444 | /* test that the reset really happened */ | |
71f80045 DT |
445 | error = tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high); |
446 | if (error) { | |
447 | dev_warn(dev, "selftest failed: read error %d after reset\n", | |
448 | error); | |
449 | success = false; | |
450 | goto out; | |
451 | } | |
452 | ||
37bd4469 LL |
453 | if (temp_high != temp_high_orig) { |
454 | dev_warn(dev, "selftest failed after reset: %d != %d\n", | |
455 | temp_high, temp_high_orig); | |
71f80045 | 456 | success = false; |
37bd4469 LL |
457 | } |
458 | ||
71f80045 | 459 | out: |
0b950d3d | 460 | __tsc2005_enable(ts); |
37bd4469 LL |
461 | mutex_unlock(&ts->mutex); |
462 | ||
71f80045 | 463 | return sprintf(buf, "%d\n", success); |
37bd4469 | 464 | } |
8dbcc432 | 465 | |
37bd4469 LL |
466 | static DEVICE_ATTR(selftest, S_IRUGO, tsc2005_selftest_show, NULL); |
467 | ||
8dbcc432 | 468 | static struct attribute *tsc2005_attrs[] = { |
8dbcc432 DT |
469 | &dev_attr_selftest.attr, |
470 | NULL | |
471 | }; | |
472 | ||
587a1f16 | 473 | static umode_t tsc2005_attr_is_visible(struct kobject *kobj, |
8dbcc432 DT |
474 | struct attribute *attr, int n) |
475 | { | |
476 | struct device *dev = container_of(kobj, struct device, kobj); | |
477 | struct spi_device *spi = to_spi_device(dev); | |
478 | struct tsc2005 *ts = spi_get_drvdata(spi); | |
587a1f16 | 479 | umode_t mode = attr->mode; |
8dbcc432 DT |
480 | |
481 | if (attr == &dev_attr_selftest.attr) { | |
a38cfebb | 482 | if (!ts->set_reset && !ts->reset_gpio) |
8dbcc432 DT |
483 | mode = 0; |
484 | } | |
485 | ||
486 | return mode; | |
487 | } | |
488 | ||
489 | static const struct attribute_group tsc2005_attr_group = { | |
490 | .is_visible = tsc2005_attr_is_visible, | |
491 | .attrs = tsc2005_attrs, | |
492 | }; | |
493 | ||
37bd4469 LL |
494 | static void tsc2005_esd_work(struct work_struct *work) |
495 | { | |
0b950d3d | 496 | struct tsc2005 *ts = container_of(work, struct tsc2005, esd_work.work); |
71f80045 | 497 | int error; |
37bd4469 LL |
498 | u16 r; |
499 | ||
a0fa2206 AK |
500 | if (!mutex_trylock(&ts->mutex)) { |
501 | /* | |
502 | * If the mutex is taken, it means that disable or enable is in | |
503 | * progress. In that case just reschedule the work. If the work | |
504 | * is not needed, it will be canceled by disable. | |
505 | */ | |
506 | goto reschedule; | |
507 | } | |
37bd4469 | 508 | |
0b950d3d DT |
509 | if (time_is_after_jiffies(ts->last_valid_interrupt + |
510 | msecs_to_jiffies(ts->esd_timeout))) | |
37bd4469 LL |
511 | goto out; |
512 | ||
0b950d3d | 513 | /* We should be able to read register without disabling interrupts. */ |
71f80045 | 514 | error = tsc2005_read(ts, TSC2005_REG_CFR0, &r); |
0b950d3d DT |
515 | if (!error && |
516 | !((r ^ TSC2005_CFR0_INITVALUE) & TSC2005_CFR0_RW_MASK)) { | |
517 | goto out; | |
37bd4469 LL |
518 | } |
519 | ||
0b950d3d DT |
520 | /* |
521 | * If we could not read our known value from configuration register 0 | |
522 | * then we should reset the controller as if from power-up and start | |
523 | * scanning again. | |
524 | */ | |
525 | dev_info(&ts->spi->dev, "TSC2005 not responding - resetting\n"); | |
526 | ||
527 | disable_irq(ts->spi->irq); | |
528 | del_timer_sync(&ts->penup_timer); | |
529 | ||
530 | tsc2005_update_pen_state(ts, 0, 0, 0); | |
531 | ||
a38cfebb | 532 | tsc2005_set_reset(ts, false); |
0b950d3d | 533 | usleep_range(100, 500); /* only 10us required */ |
a38cfebb | 534 | tsc2005_set_reset(ts, true); |
0b950d3d DT |
535 | |
536 | enable_irq(ts->spi->irq); | |
537 | tsc2005_start_scan(ts); | |
37bd4469 LL |
538 | |
539 | out: | |
a0fa2206 AK |
540 | mutex_unlock(&ts->mutex); |
541 | reschedule: | |
0b950d3d DT |
542 | /* re-arm the watchdog */ |
543 | schedule_delayed_work(&ts->esd_work, | |
90342795 | 544 | round_jiffies_relative( |
0b950d3d | 545 | msecs_to_jiffies(ts->esd_timeout))); |
0b950d3d DT |
546 | } |
547 | ||
548 | static int tsc2005_open(struct input_dev *input) | |
549 | { | |
550 | struct tsc2005 *ts = input_get_drvdata(input); | |
551 | ||
552 | mutex_lock(&ts->mutex); | |
553 | ||
5cb81d19 | 554 | if (!ts->suspended) |
0b950d3d DT |
555 | __tsc2005_enable(ts); |
556 | ||
557 | ts->opened = true; | |
558 | ||
559 | mutex_unlock(&ts->mutex); | |
560 | ||
561 | return 0; | |
562 | } | |
563 | ||
564 | static void tsc2005_close(struct input_dev *input) | |
565 | { | |
566 | struct tsc2005 *ts = input_get_drvdata(input); | |
567 | ||
568 | mutex_lock(&ts->mutex); | |
569 | ||
5cb81d19 | 570 | if (!ts->suspended) |
0b950d3d DT |
571 | __tsc2005_disable(ts); |
572 | ||
573 | ts->opened = false; | |
574 | ||
37bd4469 LL |
575 | mutex_unlock(&ts->mutex); |
576 | } | |
577 | ||
5298cc4c | 578 | static void tsc2005_setup_spi_xfer(struct tsc2005 *ts) |
37bd4469 | 579 | { |
c8b6846a DT |
580 | tsc2005_setup_read(&ts->spi_x, TSC2005_REG_X, false); |
581 | tsc2005_setup_read(&ts->spi_y, TSC2005_REG_Y, false); | |
582 | tsc2005_setup_read(&ts->spi_z1, TSC2005_REG_Z1, false); | |
583 | tsc2005_setup_read(&ts->spi_z2, TSC2005_REG_Z2, true); | |
37bd4469 LL |
584 | |
585 | spi_message_init(&ts->spi_read_msg); | |
586 | spi_message_add_tail(&ts->spi_x.spi_xfer, &ts->spi_read_msg); | |
587 | spi_message_add_tail(&ts->spi_y.spi_xfer, &ts->spi_read_msg); | |
588 | spi_message_add_tail(&ts->spi_z1.spi_xfer, &ts->spi_read_msg); | |
589 | spi_message_add_tail(&ts->spi_z2.spi_xfer, &ts->spi_read_msg); | |
590 | } | |
591 | ||
5298cc4c | 592 | static int tsc2005_probe(struct spi_device *spi) |
37bd4469 | 593 | { |
c838cb3d | 594 | const struct tsc2005_platform_data *pdata = dev_get_platdata(&spi->dev); |
a38cfebb SR |
595 | struct device_node *np = spi->dev.of_node; |
596 | ||
99bb892d DT |
597 | struct tsc2005 *ts; |
598 | struct input_dev *input_dev; | |
a38cfebb SR |
599 | unsigned int max_x = MAX_12BIT; |
600 | unsigned int max_y = MAX_12BIT; | |
601 | unsigned int max_p = MAX_12BIT; | |
602 | unsigned int fudge_x = TSC2005_DEF_X_FUZZ; | |
603 | unsigned int fudge_y = TSC2005_DEF_Y_FUZZ; | |
604 | unsigned int fudge_p = TSC2005_DEF_P_FUZZ; | |
605 | unsigned int x_plate_ohm = TSC2005_DEF_RESISTOR; | |
606 | unsigned int esd_timeout; | |
99bb892d | 607 | int error; |
37bd4469 | 608 | |
a38cfebb | 609 | if (!np && !pdata) { |
6e51c857 | 610 | dev_err(&spi->dev, "no platform data\n"); |
99bb892d DT |
611 | return -ENODEV; |
612 | } | |
37bd4469 | 613 | |
99bb892d | 614 | if (spi->irq <= 0) { |
6e51c857 | 615 | dev_err(&spi->dev, "no irq\n"); |
99bb892d DT |
616 | return -ENODEV; |
617 | } | |
37bd4469 | 618 | |
a38cfebb SR |
619 | if (pdata) { |
620 | fudge_x = pdata->ts_x_fudge; | |
621 | fudge_y = pdata->ts_y_fudge; | |
622 | fudge_p = pdata->ts_pressure_fudge; | |
623 | max_x = pdata->ts_x_max; | |
624 | max_y = pdata->ts_y_max; | |
625 | max_p = pdata->ts_pressure_max; | |
626 | x_plate_ohm = pdata->ts_x_plate_ohm; | |
627 | esd_timeout = pdata->esd_timeout_ms; | |
628 | } else { | |
629 | x_plate_ohm = TSC2005_DEF_RESISTOR; | |
630 | of_property_read_u32(np, "ti,x-plate-ohms", &x_plate_ohm); | |
631 | esd_timeout = 0; | |
632 | of_property_read_u32(np, "ti,esd-recovery-timeout-ms", | |
633 | &esd_timeout); | |
634 | } | |
635 | ||
99bb892d DT |
636 | spi->mode = SPI_MODE_0; |
637 | spi->bits_per_word = 8; | |
638 | if (!spi->max_speed_hz) | |
639 | spi->max_speed_hz = TSC2005_SPI_MAX_SPEED_HZ; | |
37bd4469 | 640 | |
99bb892d DT |
641 | error = spi_setup(spi); |
642 | if (error) | |
643 | return error; | |
37bd4469 | 644 | |
99e8325f SR |
645 | ts = devm_kzalloc(&spi->dev, sizeof(*ts), GFP_KERNEL); |
646 | if (!ts) | |
647 | return -ENOMEM; | |
648 | ||
649 | input_dev = devm_input_allocate_device(&spi->dev); | |
650 | if (!input_dev) | |
651 | return -ENOMEM; | |
37bd4469 | 652 | |
99bb892d DT |
653 | ts->spi = spi; |
654 | ts->idev = input_dev; | |
655 | ||
a38cfebb SR |
656 | ts->x_plate_ohm = x_plate_ohm; |
657 | ts->esd_timeout = esd_timeout; | |
658 | ||
659 | if (np) { | |
660 | ts->reset_gpio = of_get_named_gpio(np, "reset-gpios", 0); | |
661 | if (ts->reset_gpio == -EPROBE_DEFER) | |
662 | return ts->reset_gpio; | |
663 | if (ts->reset_gpio < 0) { | |
664 | dev_err(&spi->dev, "error acquiring reset gpio: %d\n", | |
665 | ts->reset_gpio); | |
666 | return ts->reset_gpio; | |
667 | } | |
668 | ||
669 | error = devm_gpio_request_one(&spi->dev, ts->reset_gpio, 0, | |
670 | "reset-gpios"); | |
671 | if (error) { | |
672 | dev_err(&spi->dev, "error requesting reset gpio: %d\n", | |
673 | error); | |
674 | return error; | |
675 | } | |
676 | ||
677 | ts->vio = devm_regulator_get(&spi->dev, "vio"); | |
678 | if (IS_ERR(ts->vio)) { | |
679 | error = PTR_ERR(ts->vio); | |
680 | dev_err(&spi->dev, "vio regulator missing (%d)", error); | |
681 | return error; | |
682 | } | |
683 | } else { | |
684 | ts->reset_gpio = -1; | |
685 | ts->set_reset = pdata->set_reset; | |
686 | } | |
37bd4469 | 687 | |
99bb892d | 688 | mutex_init(&ts->mutex); |
37bd4469 | 689 | |
80cc2f0c | 690 | spin_lock_init(&ts->lock); |
99bb892d | 691 | setup_timer(&ts->penup_timer, tsc2005_penup_timer, (unsigned long)ts); |
37bd4469 | 692 | |
0b950d3d | 693 | INIT_DELAYED_WORK(&ts->esd_work, tsc2005_esd_work); |
37bd4469 | 694 | |
99bb892d | 695 | tsc2005_setup_spi_xfer(ts); |
37bd4469 | 696 | |
99bb892d DT |
697 | snprintf(ts->phys, sizeof(ts->phys), |
698 | "%s/input-ts", dev_name(&spi->dev)); | |
699 | ||
700 | input_dev->name = "TSC2005 touchscreen"; | |
701 | input_dev->phys = ts->phys; | |
702 | input_dev->id.bustype = BUS_SPI; | |
703 | input_dev->dev.parent = &spi->dev; | |
704 | input_dev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY); | |
705 | input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); | |
706 | ||
707 | input_set_abs_params(input_dev, ABS_X, 0, max_x, fudge_x, 0); | |
708 | input_set_abs_params(input_dev, ABS_Y, 0, max_y, fudge_y, 0); | |
709 | input_set_abs_params(input_dev, ABS_PRESSURE, 0, max_p, fudge_p, 0); | |
710 | ||
a38cfebb | 711 | if (np) |
4200e831 | 712 | touchscreen_parse_properties(input_dev, false); |
a38cfebb | 713 | |
0b950d3d DT |
714 | input_dev->open = tsc2005_open; |
715 | input_dev->close = tsc2005_close; | |
716 | ||
717 | input_set_drvdata(input_dev, ts); | |
718 | ||
719 | /* Ensure the touchscreen is off */ | |
720 | tsc2005_stop_scan(ts); | |
721 | ||
99e8325f SR |
722 | error = devm_request_threaded_irq(&spi->dev, spi->irq, NULL, |
723 | tsc2005_irq_thread, | |
724 | IRQF_TRIGGER_RISING | IRQF_ONESHOT, | |
725 | "tsc2005", ts); | |
99bb892d DT |
726 | if (error) { |
727 | dev_err(&spi->dev, "Failed to request irq, err: %d\n", error); | |
99e8325f | 728 | return error; |
37bd4469 LL |
729 | } |
730 | ||
a38cfebb SR |
731 | /* enable regulator for DT */ |
732 | if (ts->vio) { | |
733 | error = regulator_enable(ts->vio); | |
734 | if (error) | |
735 | return error; | |
736 | } | |
737 | ||
99bb892d DT |
738 | spi_set_drvdata(spi, ts); |
739 | error = sysfs_create_group(&spi->dev.kobj, &tsc2005_attr_group); | |
740 | if (error) { | |
741 | dev_err(&spi->dev, | |
742 | "Failed to create sysfs attributes, err: %d\n", error); | |
a38cfebb | 743 | goto disable_regulator; |
37bd4469 LL |
744 | } |
745 | ||
99bb892d DT |
746 | error = input_register_device(ts->idev); |
747 | if (error) { | |
748 | dev_err(&spi->dev, | |
749 | "Failed to register input device, err: %d\n", error); | |
750 | goto err_remove_sysfs; | |
751 | } | |
37bd4469 | 752 | |
ddca6a31 | 753 | irq_set_irq_wake(spi->irq, 1); |
99bb892d DT |
754 | return 0; |
755 | ||
756 | err_remove_sysfs: | |
757 | sysfs_remove_group(&spi->dev.kobj, &tsc2005_attr_group); | |
a38cfebb SR |
758 | disable_regulator: |
759 | if (ts->vio) | |
760 | regulator_disable(ts->vio); | |
99bb892d | 761 | return error; |
37bd4469 LL |
762 | } |
763 | ||
e2619cf7 | 764 | static int tsc2005_remove(struct spi_device *spi) |
37bd4469 | 765 | { |
a38cfebb SR |
766 | struct tsc2005 *ts = spi_get_drvdata(spi); |
767 | ||
99e8325f | 768 | sysfs_remove_group(&spi->dev.kobj, &tsc2005_attr_group); |
37bd4469 | 769 | |
a38cfebb SR |
770 | if (ts->vio) |
771 | regulator_disable(ts->vio); | |
772 | ||
37bd4469 LL |
773 | return 0; |
774 | } | |
775 | ||
02b6a58b | 776 | static int __maybe_unused tsc2005_suspend(struct device *dev) |
37bd4469 | 777 | { |
6b007d62 DT |
778 | struct spi_device *spi = to_spi_device(dev); |
779 | struct tsc2005 *ts = spi_get_drvdata(spi); | |
37bd4469 LL |
780 | |
781 | mutex_lock(&ts->mutex); | |
0b950d3d | 782 | |
5cb81d19 | 783 | if (!ts->suspended && ts->opened) |
0b950d3d DT |
784 | __tsc2005_disable(ts); |
785 | ||
786 | ts->suspended = true; | |
787 | ||
37bd4469 LL |
788 | mutex_unlock(&ts->mutex); |
789 | ||
790 | return 0; | |
791 | } | |
792 | ||
02b6a58b | 793 | static int __maybe_unused tsc2005_resume(struct device *dev) |
37bd4469 | 794 | { |
6b007d62 DT |
795 | struct spi_device *spi = to_spi_device(dev); |
796 | struct tsc2005 *ts = spi_get_drvdata(spi); | |
37bd4469 LL |
797 | |
798 | mutex_lock(&ts->mutex); | |
0b950d3d | 799 | |
5cb81d19 | 800 | if (ts->suspended && ts->opened) |
0b950d3d DT |
801 | __tsc2005_enable(ts); |
802 | ||
803 | ts->suspended = false; | |
804 | ||
37bd4469 LL |
805 | mutex_unlock(&ts->mutex); |
806 | ||
807 | return 0; | |
808 | } | |
37bd4469 | 809 | |
3ff8ff53 DT |
810 | static SIMPLE_DEV_PM_OPS(tsc2005_pm_ops, tsc2005_suspend, tsc2005_resume); |
811 | ||
37bd4469 | 812 | static struct spi_driver tsc2005_driver = { |
3ff8ff53 DT |
813 | .driver = { |
814 | .name = "tsc2005", | |
815 | .owner = THIS_MODULE, | |
816 | .pm = &tsc2005_pm_ops, | |
37bd4469 | 817 | }, |
3ff8ff53 | 818 | .probe = tsc2005_probe, |
1cb0aa88 | 819 | .remove = tsc2005_remove, |
37bd4469 LL |
820 | }; |
821 | ||
ca83922e | 822 | module_spi_driver(tsc2005_driver); |
37bd4469 LL |
823 | |
824 | MODULE_AUTHOR("Lauri Leukkunen <lauri.leukkunen@nokia.com>"); | |
b88aa494 | 825 | MODULE_DESCRIPTION("TSC2005 Touchscreen Driver"); |
37bd4469 | 826 | MODULE_LICENSE("GPL"); |
938789fe | 827 | MODULE_ALIAS("spi:tsc2005"); |