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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> | |
28 | #include <linux/interrupt.h> | |
29 | #include <linux/delay.h> | |
3ff8ff53 | 30 | #include <linux/pm.h> |
37bd4469 LL |
31 | #include <linux/spi/spi.h> |
32 | #include <linux/spi/tsc2005.h> | |
33 | ||
34 | /* | |
35 | * The touchscreen interface operates as follows: | |
36 | * | |
37 | * 1) Pen is pressed against the touchscreen. | |
38 | * 2) TSC2005 performs AD conversion. | |
39 | * 3) After the conversion is done TSC2005 drives DAV line down. | |
40 | * 4) GPIO IRQ is received and tsc2005_irq_thread() is scheduled. | |
41 | * 5) tsc2005_irq_thread() queues up an spi transfer to fetch the x, y, z1, z2 | |
42 | * values. | |
43 | * 6) tsc2005_irq_thread() reports coordinates to input layer and sets up | |
44 | * tsc2005_penup_timer() to be called after TSC2005_PENUP_TIME_MS (40ms). | |
45 | * 7) When the penup timer expires, there have not been touch or DAV interrupts | |
46 | * during the last 40ms which means the pen has been lifted. | |
47 | * | |
48 | * ESD recovery via a hardware reset is done if the TSC2005 doesn't respond | |
49 | * after a configurable period (in ms) of activity. If esd_timeout is 0, the | |
50 | * watchdog is disabled. | |
51 | */ | |
52 | ||
53 | /* control byte 1 */ | |
54 | #define TSC2005_CMD 0x80 | |
55 | #define TSC2005_CMD_NORMAL 0x00 | |
56 | #define TSC2005_CMD_STOP 0x01 | |
57 | #define TSC2005_CMD_12BIT 0x04 | |
58 | ||
59 | /* control byte 0 */ | |
60 | #define TSC2005_REG_READ 0x0001 | |
61 | #define TSC2005_REG_PND0 0x0002 | |
62 | #define TSC2005_REG_X 0x0000 | |
63 | #define TSC2005_REG_Y 0x0008 | |
64 | #define TSC2005_REG_Z1 0x0010 | |
65 | #define TSC2005_REG_Z2 0x0018 | |
66 | #define TSC2005_REG_TEMP_HIGH 0x0050 | |
67 | #define TSC2005_REG_CFR0 0x0060 | |
68 | #define TSC2005_REG_CFR1 0x0068 | |
69 | #define TSC2005_REG_CFR2 0x0070 | |
70 | ||
71 | /* configuration register 0 */ | |
72 | #define TSC2005_CFR0_PRECHARGE_276US 0x0040 | |
73 | #define TSC2005_CFR0_STABTIME_1MS 0x0300 | |
74 | #define TSC2005_CFR0_CLOCK_1MHZ 0x1000 | |
75 | #define TSC2005_CFR0_RESOLUTION12 0x2000 | |
76 | #define TSC2005_CFR0_PENMODE 0x8000 | |
77 | #define TSC2005_CFR0_INITVALUE (TSC2005_CFR0_STABTIME_1MS | \ | |
78 | TSC2005_CFR0_CLOCK_1MHZ | \ | |
79 | TSC2005_CFR0_RESOLUTION12 | \ | |
80 | TSC2005_CFR0_PRECHARGE_276US | \ | |
81 | TSC2005_CFR0_PENMODE) | |
82 | ||
83 | /* bits common to both read and write of configuration register 0 */ | |
84 | #define TSC2005_CFR0_RW_MASK 0x3fff | |
85 | ||
86 | /* configuration register 1 */ | |
87 | #define TSC2005_CFR1_BATCHDELAY_4MS 0x0003 | |
88 | #define TSC2005_CFR1_INITVALUE TSC2005_CFR1_BATCHDELAY_4MS | |
89 | ||
90 | /* configuration register 2 */ | |
91 | #define TSC2005_CFR2_MAVE_Z 0x0004 | |
92 | #define TSC2005_CFR2_MAVE_Y 0x0008 | |
93 | #define TSC2005_CFR2_MAVE_X 0x0010 | |
94 | #define TSC2005_CFR2_AVG_7 0x0800 | |
95 | #define TSC2005_CFR2_MEDIUM_15 0x3000 | |
96 | #define TSC2005_CFR2_INITVALUE (TSC2005_CFR2_MAVE_X | \ | |
97 | TSC2005_CFR2_MAVE_Y | \ | |
98 | TSC2005_CFR2_MAVE_Z | \ | |
99 | TSC2005_CFR2_MEDIUM_15 | \ | |
100 | TSC2005_CFR2_AVG_7) | |
101 | ||
102 | #define MAX_12BIT 0xfff | |
103 | #define TSC2005_SPI_MAX_SPEED_HZ 10000000 | |
104 | #define TSC2005_PENUP_TIME_MS 40 | |
105 | ||
106 | struct tsc2005_spi_rd { | |
107 | struct spi_transfer spi_xfer; | |
108 | u32 spi_tx; | |
109 | u32 spi_rx; | |
110 | }; | |
111 | ||
112 | struct tsc2005 { | |
113 | struct spi_device *spi; | |
114 | ||
115 | struct spi_message spi_read_msg; | |
116 | struct tsc2005_spi_rd spi_x; | |
117 | struct tsc2005_spi_rd spi_y; | |
118 | struct tsc2005_spi_rd spi_z1; | |
119 | struct tsc2005_spi_rd spi_z2; | |
120 | ||
121 | struct input_dev *idev; | |
122 | char phys[32]; | |
123 | ||
124 | struct mutex mutex; | |
125 | ||
126 | /* raw copy of previous x,y,z */ | |
127 | int in_x; | |
128 | int in_y; | |
129 | int in_z1; | |
130 | int in_z2; | |
131 | ||
80cc2f0c | 132 | spinlock_t lock; |
37bd4469 | 133 | struct timer_list penup_timer; |
37bd4469 LL |
134 | |
135 | unsigned int esd_timeout; | |
0b950d3d DT |
136 | struct delayed_work esd_work; |
137 | unsigned long last_valid_interrupt; | |
37bd4469 LL |
138 | |
139 | unsigned int x_plate_ohm; | |
140 | ||
0b950d3d DT |
141 | bool opened; |
142 | bool suspended; | |
c8b6846a DT |
143 | |
144 | bool pen_down; | |
37bd4469 LL |
145 | |
146 | void (*set_reset)(bool enable); | |
147 | }; | |
148 | ||
71f80045 | 149 | static int tsc2005_cmd(struct tsc2005 *ts, u8 cmd) |
37bd4469 | 150 | { |
9a6e180a DT |
151 | u8 tx = TSC2005_CMD | TSC2005_CMD_12BIT | cmd; |
152 | struct spi_transfer xfer = { | |
153 | .tx_buf = &tx, | |
154 | .len = 1, | |
155 | .bits_per_word = 8, | |
156 | }; | |
37bd4469 | 157 | struct spi_message msg; |
71f80045 | 158 | int error; |
37bd4469 LL |
159 | |
160 | spi_message_init(&msg); | |
161 | spi_message_add_tail(&xfer, &msg); | |
71f80045 DT |
162 | |
163 | error = spi_sync(ts->spi, &msg); | |
164 | if (error) { | |
165 | dev_err(&ts->spi->dev, "%s: failed, command: %x, error: %d\n", | |
166 | __func__, cmd, error); | |
167 | return error; | |
168 | } | |
169 | ||
170 | return 0; | |
37bd4469 LL |
171 | } |
172 | ||
71f80045 | 173 | static int tsc2005_write(struct tsc2005 *ts, u8 reg, u16 value) |
37bd4469 | 174 | { |
9a6e180a DT |
175 | u32 tx = ((reg | TSC2005_REG_PND0) << 16) | value; |
176 | struct spi_transfer xfer = { | |
177 | .tx_buf = &tx, | |
178 | .len = 4, | |
179 | .bits_per_word = 24, | |
180 | }; | |
37bd4469 | 181 | struct spi_message msg; |
71f80045 | 182 | int error; |
37bd4469 LL |
183 | |
184 | spi_message_init(&msg); | |
185 | spi_message_add_tail(&xfer, &msg); | |
71f80045 DT |
186 | |
187 | error = spi_sync(ts->spi, &msg); | |
188 | if (error) { | |
189 | dev_err(&ts->spi->dev, | |
190 | "%s: failed, register: %x, value: %x, error: %d\n", | |
191 | __func__, reg, value, error); | |
192 | return error; | |
193 | } | |
194 | ||
195 | return 0; | |
37bd4469 LL |
196 | } |
197 | ||
198 | static void tsc2005_setup_read(struct tsc2005_spi_rd *rd, u8 reg, bool last) | |
199 | { | |
9a6e180a DT |
200 | memset(rd, 0, sizeof(*rd)); |
201 | ||
37bd4469 LL |
202 | rd->spi_tx = (reg | TSC2005_REG_READ) << 16; |
203 | rd->spi_xfer.tx_buf = &rd->spi_tx; | |
204 | rd->spi_xfer.rx_buf = &rd->spi_rx; | |
205 | rd->spi_xfer.len = 4; | |
206 | rd->spi_xfer.bits_per_word = 24; | |
207 | rd->spi_xfer.cs_change = !last; | |
208 | } | |
209 | ||
71f80045 | 210 | static int tsc2005_read(struct tsc2005 *ts, u8 reg, u16 *value) |
37bd4469 | 211 | { |
9a6e180a | 212 | struct tsc2005_spi_rd spi_rd; |
37bd4469 | 213 | struct spi_message msg; |
71f80045 | 214 | int error; |
37bd4469 | 215 | |
c8b6846a | 216 | tsc2005_setup_read(&spi_rd, reg, true); |
37bd4469 LL |
217 | |
218 | spi_message_init(&msg); | |
219 | spi_message_add_tail(&spi_rd.spi_xfer, &msg); | |
71f80045 DT |
220 | |
221 | error = spi_sync(ts->spi, &msg); | |
222 | if (error) | |
223 | return error; | |
9a6e180a | 224 | |
37bd4469 | 225 | *value = spi_rd.spi_rx; |
71f80045 | 226 | return 0; |
37bd4469 LL |
227 | } |
228 | ||
229 | static void tsc2005_update_pen_state(struct tsc2005 *ts, | |
230 | int x, int y, int pressure) | |
231 | { | |
232 | if (pressure) { | |
233 | input_report_abs(ts->idev, ABS_X, x); | |
234 | input_report_abs(ts->idev, ABS_Y, y); | |
235 | input_report_abs(ts->idev, ABS_PRESSURE, pressure); | |
236 | if (!ts->pen_down) { | |
237 | input_report_key(ts->idev, BTN_TOUCH, !!pressure); | |
c8b6846a | 238 | ts->pen_down = true; |
37bd4469 LL |
239 | } |
240 | } else { | |
241 | input_report_abs(ts->idev, ABS_PRESSURE, 0); | |
242 | if (ts->pen_down) { | |
243 | input_report_key(ts->idev, BTN_TOUCH, 0); | |
c8b6846a | 244 | ts->pen_down = false; |
37bd4469 LL |
245 | } |
246 | } | |
247 | input_sync(ts->idev); | |
248 | dev_dbg(&ts->spi->dev, "point(%4d,%4d), pressure (%4d)\n", x, y, | |
249 | pressure); | |
250 | } | |
251 | ||
37bd4469 LL |
252 | static irqreturn_t tsc2005_irq_thread(int irq, void *_ts) |
253 | { | |
254 | struct tsc2005 *ts = _ts; | |
80cc2f0c | 255 | unsigned long flags; |
37bd4469 | 256 | unsigned int pressure; |
80cc2f0c DT |
257 | u32 x, y; |
258 | u32 z1, z2; | |
71f80045 | 259 | int error; |
37bd4469 | 260 | |
37bd4469 | 261 | /* read the coordinates */ |
71f80045 DT |
262 | error = spi_sync(ts->spi, &ts->spi_read_msg); |
263 | if (unlikely(error)) | |
264 | goto out; | |
265 | ||
37bd4469 LL |
266 | x = ts->spi_x.spi_rx; |
267 | y = ts->spi_y.spi_rx; | |
268 | z1 = ts->spi_z1.spi_rx; | |
269 | z2 = ts->spi_z2.spi_rx; | |
270 | ||
271 | /* validate position */ | |
272 | if (unlikely(x > MAX_12BIT || y > MAX_12BIT)) | |
273 | goto out; | |
274 | ||
80cc2f0c | 275 | /* Skip reading if the pressure components are out of range */ |
37bd4469 LL |
276 | if (unlikely(z1 == 0 || z2 > MAX_12BIT || z1 >= z2)) |
277 | goto out; | |
278 | ||
80cc2f0c DT |
279 | /* |
280 | * Skip point if this is a pen down with the exact same values as | |
37bd4469 LL |
281 | * the value before pen-up - that implies SPI fed us stale data |
282 | */ | |
283 | if (!ts->pen_down && | |
80cc2f0c DT |
284 | ts->in_x == x && ts->in_y == y && |
285 | ts->in_z1 == z1 && ts->in_z2 == z2) { | |
37bd4469 | 286 | goto out; |
80cc2f0c | 287 | } |
37bd4469 | 288 | |
80cc2f0c DT |
289 | /* |
290 | * At this point we are happy we have a valid and useful reading. | |
291 | * Remember it for later comparisons. We may now begin downsampling. | |
292 | */ | |
37bd4469 LL |
293 | ts->in_x = x; |
294 | ts->in_y = y; | |
295 | ts->in_z1 = z1; | |
296 | ts->in_z2 = z2; | |
297 | ||
80cc2f0c | 298 | /* Compute touch pressure resistance using equation #1 */ |
37bd4469 LL |
299 | pressure = x * (z2 - z1) / z1; |
300 | pressure = pressure * ts->x_plate_ohm / 4096; | |
301 | if (unlikely(pressure > MAX_12BIT)) | |
302 | goto out; | |
303 | ||
80cc2f0c DT |
304 | spin_lock_irqsave(&ts->lock, flags); |
305 | ||
37bd4469 | 306 | tsc2005_update_pen_state(ts, x, y, pressure); |
37bd4469 LL |
307 | mod_timer(&ts->penup_timer, |
308 | jiffies + msecs_to_jiffies(TSC2005_PENUP_TIME_MS)); | |
309 | ||
80cc2f0c | 310 | spin_unlock_irqrestore(&ts->lock, flags); |
37bd4469 | 311 | |
0b950d3d | 312 | ts->last_valid_interrupt = jiffies; |
37bd4469 | 313 | out: |
37bd4469 LL |
314 | return IRQ_HANDLED; |
315 | } | |
316 | ||
317 | static void tsc2005_penup_timer(unsigned long data) | |
318 | { | |
319 | struct tsc2005 *ts = (struct tsc2005 *)data; | |
80cc2f0c | 320 | unsigned long flags; |
37bd4469 | 321 | |
80cc2f0c | 322 | spin_lock_irqsave(&ts->lock, flags); |
37bd4469 | 323 | tsc2005_update_pen_state(ts, 0, 0, 0); |
80cc2f0c | 324 | spin_unlock_irqrestore(&ts->lock, flags); |
37bd4469 LL |
325 | } |
326 | ||
327 | static void tsc2005_start_scan(struct tsc2005 *ts) | |
328 | { | |
329 | tsc2005_write(ts, TSC2005_REG_CFR0, TSC2005_CFR0_INITVALUE); | |
330 | tsc2005_write(ts, TSC2005_REG_CFR1, TSC2005_CFR1_INITVALUE); | |
331 | tsc2005_write(ts, TSC2005_REG_CFR2, TSC2005_CFR2_INITVALUE); | |
332 | tsc2005_cmd(ts, TSC2005_CMD_NORMAL); | |
333 | } | |
334 | ||
335 | static void tsc2005_stop_scan(struct tsc2005 *ts) | |
336 | { | |
337 | tsc2005_cmd(ts, TSC2005_CMD_STOP); | |
338 | } | |
339 | ||
0b950d3d DT |
340 | /* must be called with ts->mutex held */ |
341 | static void __tsc2005_disable(struct tsc2005 *ts) | |
37bd4469 | 342 | { |
0b950d3d DT |
343 | tsc2005_stop_scan(ts); |
344 | ||
37bd4469 | 345 | disable_irq(ts->spi->irq); |
37bd4469 | 346 | del_timer_sync(&ts->penup_timer); |
0b950d3d DT |
347 | |
348 | cancel_delayed_work_sync(&ts->esd_work); | |
349 | ||
350 | enable_irq(ts->spi->irq); | |
37bd4469 LL |
351 | } |
352 | ||
0b950d3d DT |
353 | /* must be called with ts->mutex held */ |
354 | static void __tsc2005_enable(struct tsc2005 *ts) | |
37bd4469 | 355 | { |
37bd4469 | 356 | tsc2005_start_scan(ts); |
0b950d3d DT |
357 | |
358 | if (ts->esd_timeout && ts->set_reset) { | |
359 | ts->last_valid_interrupt = jiffies; | |
360 | schedule_delayed_work(&ts->esd_work, | |
90342795 | 361 | round_jiffies_relative( |
0b950d3d DT |
362 | msecs_to_jiffies(ts->esd_timeout))); |
363 | } | |
364 | ||
37bd4469 LL |
365 | } |
366 | ||
37bd4469 LL |
367 | static ssize_t tsc2005_selftest_show(struct device *dev, |
368 | struct device_attribute *attr, | |
369 | char *buf) | |
370 | { | |
6b007d62 DT |
371 | struct spi_device *spi = to_spi_device(dev); |
372 | struct tsc2005 *ts = spi_get_drvdata(spi); | |
37bd4469 LL |
373 | u16 temp_high; |
374 | u16 temp_high_orig; | |
375 | u16 temp_high_test; | |
71f80045 DT |
376 | bool success = true; |
377 | int error; | |
37bd4469 | 378 | |
37bd4469 LL |
379 | mutex_lock(&ts->mutex); |
380 | ||
381 | /* | |
382 | * Test TSC2005 communications via temp high register. | |
383 | */ | |
0b950d3d | 384 | __tsc2005_disable(ts); |
71f80045 DT |
385 | |
386 | error = tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high_orig); | |
387 | if (error) { | |
388 | dev_warn(dev, "selftest failed: read error %d\n", error); | |
389 | success = false; | |
390 | goto out; | |
391 | } | |
392 | ||
37bd4469 | 393 | temp_high_test = (temp_high_orig - 1) & MAX_12BIT; |
71f80045 DT |
394 | |
395 | error = tsc2005_write(ts, TSC2005_REG_TEMP_HIGH, temp_high_test); | |
396 | if (error) { | |
397 | dev_warn(dev, "selftest failed: write error %d\n", error); | |
398 | success = false; | |
399 | goto out; | |
400 | } | |
401 | ||
402 | error = tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high); | |
403 | if (error) { | |
404 | dev_warn(dev, "selftest failed: read error %d after write\n", | |
405 | error); | |
406 | success = false; | |
407 | goto out; | |
408 | } | |
409 | ||
37bd4469 LL |
410 | if (temp_high != temp_high_test) { |
411 | dev_warn(dev, "selftest failed: %d != %d\n", | |
412 | temp_high, temp_high_test); | |
71f80045 | 413 | success = false; |
37bd4469 LL |
414 | } |
415 | ||
416 | /* hardware reset */ | |
c8b6846a | 417 | ts->set_reset(false); |
37bd4469 | 418 | usleep_range(100, 500); /* only 10us required */ |
c8b6846a | 419 | ts->set_reset(true); |
71f80045 DT |
420 | |
421 | if (!success) | |
422 | goto out; | |
37bd4469 LL |
423 | |
424 | /* test that the reset really happened */ | |
71f80045 DT |
425 | error = tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high); |
426 | if (error) { | |
427 | dev_warn(dev, "selftest failed: read error %d after reset\n", | |
428 | error); | |
429 | success = false; | |
430 | goto out; | |
431 | } | |
432 | ||
37bd4469 LL |
433 | if (temp_high != temp_high_orig) { |
434 | dev_warn(dev, "selftest failed after reset: %d != %d\n", | |
435 | temp_high, temp_high_orig); | |
71f80045 | 436 | success = false; |
37bd4469 LL |
437 | } |
438 | ||
71f80045 | 439 | out: |
0b950d3d | 440 | __tsc2005_enable(ts); |
37bd4469 LL |
441 | mutex_unlock(&ts->mutex); |
442 | ||
71f80045 | 443 | return sprintf(buf, "%d\n", success); |
37bd4469 | 444 | } |
8dbcc432 | 445 | |
37bd4469 LL |
446 | static DEVICE_ATTR(selftest, S_IRUGO, tsc2005_selftest_show, NULL); |
447 | ||
8dbcc432 | 448 | static struct attribute *tsc2005_attrs[] = { |
8dbcc432 DT |
449 | &dev_attr_selftest.attr, |
450 | NULL | |
451 | }; | |
452 | ||
587a1f16 | 453 | static umode_t tsc2005_attr_is_visible(struct kobject *kobj, |
8dbcc432 DT |
454 | struct attribute *attr, int n) |
455 | { | |
456 | struct device *dev = container_of(kobj, struct device, kobj); | |
457 | struct spi_device *spi = to_spi_device(dev); | |
458 | struct tsc2005 *ts = spi_get_drvdata(spi); | |
587a1f16 | 459 | umode_t mode = attr->mode; |
8dbcc432 DT |
460 | |
461 | if (attr == &dev_attr_selftest.attr) { | |
462 | if (!ts->set_reset) | |
463 | mode = 0; | |
464 | } | |
465 | ||
466 | return mode; | |
467 | } | |
468 | ||
469 | static const struct attribute_group tsc2005_attr_group = { | |
470 | .is_visible = tsc2005_attr_is_visible, | |
471 | .attrs = tsc2005_attrs, | |
472 | }; | |
473 | ||
37bd4469 LL |
474 | static void tsc2005_esd_work(struct work_struct *work) |
475 | { | |
0b950d3d | 476 | struct tsc2005 *ts = container_of(work, struct tsc2005, esd_work.work); |
71f80045 | 477 | int error; |
37bd4469 LL |
478 | u16 r; |
479 | ||
a0fa2206 AK |
480 | if (!mutex_trylock(&ts->mutex)) { |
481 | /* | |
482 | * If the mutex is taken, it means that disable or enable is in | |
483 | * progress. In that case just reschedule the work. If the work | |
484 | * is not needed, it will be canceled by disable. | |
485 | */ | |
486 | goto reschedule; | |
487 | } | |
37bd4469 | 488 | |
0b950d3d DT |
489 | if (time_is_after_jiffies(ts->last_valid_interrupt + |
490 | msecs_to_jiffies(ts->esd_timeout))) | |
37bd4469 LL |
491 | goto out; |
492 | ||
0b950d3d | 493 | /* We should be able to read register without disabling interrupts. */ |
71f80045 | 494 | error = tsc2005_read(ts, TSC2005_REG_CFR0, &r); |
0b950d3d DT |
495 | if (!error && |
496 | !((r ^ TSC2005_CFR0_INITVALUE) & TSC2005_CFR0_RW_MASK)) { | |
497 | goto out; | |
37bd4469 LL |
498 | } |
499 | ||
0b950d3d DT |
500 | /* |
501 | * If we could not read our known value from configuration register 0 | |
502 | * then we should reset the controller as if from power-up and start | |
503 | * scanning again. | |
504 | */ | |
505 | dev_info(&ts->spi->dev, "TSC2005 not responding - resetting\n"); | |
506 | ||
507 | disable_irq(ts->spi->irq); | |
508 | del_timer_sync(&ts->penup_timer); | |
509 | ||
510 | tsc2005_update_pen_state(ts, 0, 0, 0); | |
511 | ||
512 | ts->set_reset(false); | |
513 | usleep_range(100, 500); /* only 10us required */ | |
514 | ts->set_reset(true); | |
515 | ||
516 | enable_irq(ts->spi->irq); | |
517 | tsc2005_start_scan(ts); | |
37bd4469 LL |
518 | |
519 | out: | |
a0fa2206 AK |
520 | mutex_unlock(&ts->mutex); |
521 | reschedule: | |
0b950d3d DT |
522 | /* re-arm the watchdog */ |
523 | schedule_delayed_work(&ts->esd_work, | |
90342795 | 524 | round_jiffies_relative( |
0b950d3d | 525 | msecs_to_jiffies(ts->esd_timeout))); |
0b950d3d DT |
526 | } |
527 | ||
528 | static int tsc2005_open(struct input_dev *input) | |
529 | { | |
530 | struct tsc2005 *ts = input_get_drvdata(input); | |
531 | ||
532 | mutex_lock(&ts->mutex); | |
533 | ||
5cb81d19 | 534 | if (!ts->suspended) |
0b950d3d DT |
535 | __tsc2005_enable(ts); |
536 | ||
537 | ts->opened = true; | |
538 | ||
539 | mutex_unlock(&ts->mutex); | |
540 | ||
541 | return 0; | |
542 | } | |
543 | ||
544 | static void tsc2005_close(struct input_dev *input) | |
545 | { | |
546 | struct tsc2005 *ts = input_get_drvdata(input); | |
547 | ||
548 | mutex_lock(&ts->mutex); | |
549 | ||
5cb81d19 | 550 | if (!ts->suspended) |
0b950d3d DT |
551 | __tsc2005_disable(ts); |
552 | ||
553 | ts->opened = false; | |
554 | ||
37bd4469 LL |
555 | mutex_unlock(&ts->mutex); |
556 | } | |
557 | ||
558 | static void __devinit tsc2005_setup_spi_xfer(struct tsc2005 *ts) | |
559 | { | |
c8b6846a DT |
560 | tsc2005_setup_read(&ts->spi_x, TSC2005_REG_X, false); |
561 | tsc2005_setup_read(&ts->spi_y, TSC2005_REG_Y, false); | |
562 | tsc2005_setup_read(&ts->spi_z1, TSC2005_REG_Z1, false); | |
563 | tsc2005_setup_read(&ts->spi_z2, TSC2005_REG_Z2, true); | |
37bd4469 LL |
564 | |
565 | spi_message_init(&ts->spi_read_msg); | |
566 | spi_message_add_tail(&ts->spi_x.spi_xfer, &ts->spi_read_msg); | |
567 | spi_message_add_tail(&ts->spi_y.spi_xfer, &ts->spi_read_msg); | |
568 | spi_message_add_tail(&ts->spi_z1.spi_xfer, &ts->spi_read_msg); | |
569 | spi_message_add_tail(&ts->spi_z2.spi_xfer, &ts->spi_read_msg); | |
570 | } | |
571 | ||
99bb892d | 572 | static int __devinit tsc2005_probe(struct spi_device *spi) |
37bd4469 | 573 | { |
99bb892d DT |
574 | const struct tsc2005_platform_data *pdata = spi->dev.platform_data; |
575 | struct tsc2005 *ts; | |
576 | struct input_dev *input_dev; | |
577 | unsigned int max_x, max_y, max_p; | |
578 | unsigned int fudge_x, fudge_y, fudge_p; | |
579 | int error; | |
37bd4469 | 580 | |
99bb892d DT |
581 | if (!pdata) { |
582 | dev_dbg(&spi->dev, "no platform data\n"); | |
583 | return -ENODEV; | |
584 | } | |
37bd4469 | 585 | |
99bb892d DT |
586 | fudge_x = pdata->ts_x_fudge ? : 4; |
587 | fudge_y = pdata->ts_y_fudge ? : 8; | |
588 | fudge_p = pdata->ts_pressure_fudge ? : 2; | |
589 | max_x = pdata->ts_x_max ? : MAX_12BIT; | |
590 | max_y = pdata->ts_y_max ? : MAX_12BIT; | |
591 | max_p = pdata->ts_pressure_max ? : MAX_12BIT; | |
37bd4469 | 592 | |
99bb892d DT |
593 | if (spi->irq <= 0) { |
594 | dev_dbg(&spi->dev, "no irq\n"); | |
595 | return -ENODEV; | |
596 | } | |
37bd4469 | 597 | |
99bb892d DT |
598 | spi->mode = SPI_MODE_0; |
599 | spi->bits_per_word = 8; | |
600 | if (!spi->max_speed_hz) | |
601 | spi->max_speed_hz = TSC2005_SPI_MAX_SPEED_HZ; | |
37bd4469 | 602 | |
99bb892d DT |
603 | error = spi_setup(spi); |
604 | if (error) | |
605 | return error; | |
37bd4469 | 606 | |
99bb892d DT |
607 | ts = kzalloc(sizeof(*ts), GFP_KERNEL); |
608 | input_dev = input_allocate_device(); | |
609 | if (!ts || !input_dev) { | |
610 | error = -ENOMEM; | |
611 | goto err_free_mem; | |
37bd4469 LL |
612 | } |
613 | ||
99bb892d DT |
614 | ts->spi = spi; |
615 | ts->idev = input_dev; | |
616 | ||
617 | ts->x_plate_ohm = pdata->ts_x_plate_ohm ? : 280; | |
618 | ts->esd_timeout = pdata->esd_timeout_ms; | |
619 | ts->set_reset = pdata->set_reset; | |
37bd4469 | 620 | |
99bb892d | 621 | mutex_init(&ts->mutex); |
37bd4469 | 622 | |
80cc2f0c | 623 | spin_lock_init(&ts->lock); |
99bb892d | 624 | setup_timer(&ts->penup_timer, tsc2005_penup_timer, (unsigned long)ts); |
37bd4469 | 625 | |
0b950d3d | 626 | INIT_DELAYED_WORK(&ts->esd_work, tsc2005_esd_work); |
37bd4469 | 627 | |
99bb892d | 628 | tsc2005_setup_spi_xfer(ts); |
37bd4469 | 629 | |
99bb892d DT |
630 | snprintf(ts->phys, sizeof(ts->phys), |
631 | "%s/input-ts", dev_name(&spi->dev)); | |
632 | ||
633 | input_dev->name = "TSC2005 touchscreen"; | |
634 | input_dev->phys = ts->phys; | |
635 | input_dev->id.bustype = BUS_SPI; | |
636 | input_dev->dev.parent = &spi->dev; | |
637 | input_dev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY); | |
638 | input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); | |
639 | ||
640 | input_set_abs_params(input_dev, ABS_X, 0, max_x, fudge_x, 0); | |
641 | input_set_abs_params(input_dev, ABS_Y, 0, max_y, fudge_y, 0); | |
642 | input_set_abs_params(input_dev, ABS_PRESSURE, 0, max_p, fudge_p, 0); | |
643 | ||
0b950d3d DT |
644 | input_dev->open = tsc2005_open; |
645 | input_dev->close = tsc2005_close; | |
646 | ||
647 | input_set_drvdata(input_dev, ts); | |
648 | ||
649 | /* Ensure the touchscreen is off */ | |
650 | tsc2005_stop_scan(ts); | |
651 | ||
dacb650f | 652 | error = request_threaded_irq(spi->irq, NULL, tsc2005_irq_thread, |
9b7e31bb LPC |
653 | IRQF_TRIGGER_RISING | IRQF_ONESHOT, |
654 | "tsc2005", ts); | |
99bb892d DT |
655 | if (error) { |
656 | dev_err(&spi->dev, "Failed to request irq, err: %d\n", error); | |
657 | goto err_free_mem; | |
37bd4469 LL |
658 | } |
659 | ||
99bb892d DT |
660 | spi_set_drvdata(spi, ts); |
661 | error = sysfs_create_group(&spi->dev.kobj, &tsc2005_attr_group); | |
662 | if (error) { | |
663 | dev_err(&spi->dev, | |
664 | "Failed to create sysfs attributes, err: %d\n", error); | |
665 | goto err_clear_drvdata; | |
37bd4469 LL |
666 | } |
667 | ||
99bb892d DT |
668 | error = input_register_device(ts->idev); |
669 | if (error) { | |
670 | dev_err(&spi->dev, | |
671 | "Failed to register input device, err: %d\n", error); | |
672 | goto err_remove_sysfs; | |
673 | } | |
37bd4469 | 674 | |
ddca6a31 | 675 | irq_set_irq_wake(spi->irq, 1); |
99bb892d DT |
676 | return 0; |
677 | ||
678 | err_remove_sysfs: | |
679 | sysfs_remove_group(&spi->dev.kobj, &tsc2005_attr_group); | |
680 | err_clear_drvdata: | |
681 | spi_set_drvdata(spi, NULL); | |
682 | free_irq(spi->irq, ts); | |
683 | err_free_mem: | |
684 | input_free_device(input_dev); | |
685 | kfree(ts); | |
686 | return error; | |
37bd4469 LL |
687 | } |
688 | ||
689 | static int __devexit tsc2005_remove(struct spi_device *spi) | |
690 | { | |
6b007d62 | 691 | struct tsc2005 *ts = spi_get_drvdata(spi); |
37bd4469 | 692 | |
99bb892d DT |
693 | sysfs_remove_group(&ts->spi->dev.kobj, &tsc2005_attr_group); |
694 | ||
37bd4469 LL |
695 | free_irq(ts->spi->irq, ts); |
696 | input_unregister_device(ts->idev); | |
697 | kfree(ts); | |
698 | ||
2721a89a | 699 | spi_set_drvdata(spi, NULL); |
37bd4469 LL |
700 | return 0; |
701 | } | |
702 | ||
3ff8ff53 DT |
703 | #ifdef CONFIG_PM_SLEEP |
704 | static int tsc2005_suspend(struct device *dev) | |
37bd4469 | 705 | { |
6b007d62 DT |
706 | struct spi_device *spi = to_spi_device(dev); |
707 | struct tsc2005 *ts = spi_get_drvdata(spi); | |
37bd4469 LL |
708 | |
709 | mutex_lock(&ts->mutex); | |
0b950d3d | 710 | |
5cb81d19 | 711 | if (!ts->suspended && ts->opened) |
0b950d3d DT |
712 | __tsc2005_disable(ts); |
713 | ||
714 | ts->suspended = true; | |
715 | ||
37bd4469 LL |
716 | mutex_unlock(&ts->mutex); |
717 | ||
718 | return 0; | |
719 | } | |
720 | ||
3ff8ff53 | 721 | static int tsc2005_resume(struct device *dev) |
37bd4469 | 722 | { |
6b007d62 DT |
723 | struct spi_device *spi = to_spi_device(dev); |
724 | struct tsc2005 *ts = spi_get_drvdata(spi); | |
37bd4469 LL |
725 | |
726 | mutex_lock(&ts->mutex); | |
0b950d3d | 727 | |
5cb81d19 | 728 | if (ts->suspended && ts->opened) |
0b950d3d DT |
729 | __tsc2005_enable(ts); |
730 | ||
731 | ts->suspended = false; | |
732 | ||
37bd4469 LL |
733 | mutex_unlock(&ts->mutex); |
734 | ||
735 | return 0; | |
736 | } | |
737 | #endif | |
738 | ||
3ff8ff53 DT |
739 | static SIMPLE_DEV_PM_OPS(tsc2005_pm_ops, tsc2005_suspend, tsc2005_resume); |
740 | ||
37bd4469 | 741 | static struct spi_driver tsc2005_driver = { |
3ff8ff53 DT |
742 | .driver = { |
743 | .name = "tsc2005", | |
744 | .owner = THIS_MODULE, | |
745 | .pm = &tsc2005_pm_ops, | |
37bd4469 | 746 | }, |
3ff8ff53 DT |
747 | .probe = tsc2005_probe, |
748 | .remove = __devexit_p(tsc2005_remove), | |
37bd4469 LL |
749 | }; |
750 | ||
ca83922e | 751 | module_spi_driver(tsc2005_driver); |
37bd4469 LL |
752 | |
753 | MODULE_AUTHOR("Lauri Leukkunen <lauri.leukkunen@nokia.com>"); | |
b88aa494 | 754 | MODULE_DESCRIPTION("TSC2005 Touchscreen Driver"); |
37bd4469 | 755 | MODULE_LICENSE("GPL"); |