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Btrfs: device_list_add() should not update list when mounted
[linux/fpc-iii.git] / drivers / mfd / stmpe.c
blob3b6bfa7184ad7167716bbea2c04f7b4f3375847b
1 /*
2 * ST Microelectronics MFD: stmpe's driver
3 *
4 * Copyright (C) ST-Ericsson SA 2010
5 *
6 * License Terms: GNU General Public License, version 2
7 * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
8 */
9
10 #include <linux/err.h>
11 #include <linux/gpio.h>
12 #include <linux/export.h>
13 #include <linux/kernel.h>
14 #include <linux/interrupt.h>
15 #include <linux/irq.h>
16 #include <linux/irqdomain.h>
17 #include <linux/of.h>
18 #include <linux/of_gpio.h>
19 #include <linux/pm.h>
20 #include <linux/slab.h>
21 #include <linux/mfd/core.h>
22 #include <linux/delay.h>
23 #include <linux/regulator/consumer.h>
24 #include "stmpe.h"
25
26 static int __stmpe_enable(struct stmpe *stmpe, unsigned int blocks)
27 {
28 return stmpe->variant->enable(stmpe, blocks, true);
29 }
30
31 static int __stmpe_disable(struct stmpe *stmpe, unsigned int blocks)
32 {
33 return stmpe->variant->enable(stmpe, blocks, false);
34 }
35
36 static int __stmpe_reg_read(struct stmpe *stmpe, u8 reg)
37 {
38 int ret;
39
40 ret = stmpe->ci->read_byte(stmpe, reg);
41 if (ret < 0)
42 dev_err(stmpe->dev, "failed to read reg %#x: %d\n", reg, ret);
43
44 dev_vdbg(stmpe->dev, "rd: reg %#x => data %#x\n", reg, ret);
45
46 return ret;
47 }
48
49 static int __stmpe_reg_write(struct stmpe *stmpe, u8 reg, u8 val)
50 {
51 int ret;
52
53 dev_vdbg(stmpe->dev, "wr: reg %#x <= %#x\n", reg, val);
54
55 ret = stmpe->ci->write_byte(stmpe, reg, val);
56 if (ret < 0)
57 dev_err(stmpe->dev, "failed to write reg %#x: %d\n", reg, ret);
58
59 return ret;
60 }
61
62 static int __stmpe_set_bits(struct stmpe *stmpe, u8 reg, u8 mask, u8 val)
63 {
64 int ret;
65
66 ret = __stmpe_reg_read(stmpe, reg);
67 if (ret < 0)
68 return ret;
69
70 ret &= ~mask;
71 ret |= val;
72
73 return __stmpe_reg_write(stmpe, reg, ret);
74 }
75
76 static int __stmpe_block_read(struct stmpe *stmpe, u8 reg, u8 length,
77 u8 *values)
78 {
79 int ret;
80
81 ret = stmpe->ci->read_block(stmpe, reg, length, values);
82 if (ret < 0)
83 dev_err(stmpe->dev, "failed to read regs %#x: %d\n", reg, ret);
84
85 dev_vdbg(stmpe->dev, "rd: reg %#x (%d) => ret %#x\n", reg, length, ret);
86 stmpe_dump_bytes("stmpe rd: ", values, length);
87
88 return ret;
89 }
90
91 static int __stmpe_block_write(struct stmpe *stmpe, u8 reg, u8 length,
92 const u8 *values)
93 {
94 int ret;
95
96 dev_vdbg(stmpe->dev, "wr: regs %#x (%d)\n", reg, length);
97 stmpe_dump_bytes("stmpe wr: ", values, length);
98
99 ret = stmpe->ci->write_block(stmpe, reg, length, values);
100 if (ret < 0)
101 dev_err(stmpe->dev, "failed to write regs %#x: %d\n", reg, ret);
102
103 return ret;
104 }
105
106 /**
107 * stmpe_enable - enable blocks on an STMPE device
108 * @stmpe: Device to work on
109 * @blocks: Mask of blocks (enum stmpe_block values) to enable
110 */
111 int stmpe_enable(struct stmpe *stmpe, unsigned int blocks)
112 {
113 int ret;
114
115 mutex_lock(&stmpe->lock);
116 ret = __stmpe_enable(stmpe, blocks);
117 mutex_unlock(&stmpe->lock);
118
119 return ret;
120 }
121 EXPORT_SYMBOL_GPL(stmpe_enable);
122
123 /**
124 * stmpe_disable - disable blocks on an STMPE device
125 * @stmpe: Device to work on
126 * @blocks: Mask of blocks (enum stmpe_block values) to enable
127 */
128 int stmpe_disable(struct stmpe *stmpe, unsigned int blocks)
129 {
130 int ret;
131
132 mutex_lock(&stmpe->lock);
133 ret = __stmpe_disable(stmpe, blocks);
134 mutex_unlock(&stmpe->lock);
135
136 return ret;
137 }
138 EXPORT_SYMBOL_GPL(stmpe_disable);
139
140 /**
141 * stmpe_reg_read() - read a single STMPE register
142 * @stmpe: Device to read from
143 * @reg: Register to read
144 */
145 int stmpe_reg_read(struct stmpe *stmpe, u8 reg)
146 {
147 int ret;
148
149 mutex_lock(&stmpe->lock);
150 ret = __stmpe_reg_read(stmpe, reg);
151 mutex_unlock(&stmpe->lock);
152
153 return ret;
154 }
155 EXPORT_SYMBOL_GPL(stmpe_reg_read);
156
157 /**
158 * stmpe_reg_write() - write a single STMPE register
159 * @stmpe: Device to write to
160 * @reg: Register to write
161 * @val: Value to write
162 */
163 int stmpe_reg_write(struct stmpe *stmpe, u8 reg, u8 val)
164 {
165 int ret;
166
167 mutex_lock(&stmpe->lock);
168 ret = __stmpe_reg_write(stmpe, reg, val);
169 mutex_unlock(&stmpe->lock);
170
171 return ret;
172 }
173 EXPORT_SYMBOL_GPL(stmpe_reg_write);
174
175 /**
176 * stmpe_set_bits() - set the value of a bitfield in a STMPE register
177 * @stmpe: Device to write to
178 * @reg: Register to write
179 * @mask: Mask of bits to set
180 * @val: Value to set
181 */
182 int stmpe_set_bits(struct stmpe *stmpe, u8 reg, u8 mask, u8 val)
183 {
184 int ret;
185
186 mutex_lock(&stmpe->lock);
187 ret = __stmpe_set_bits(stmpe, reg, mask, val);
188 mutex_unlock(&stmpe->lock);
189
190 return ret;
191 }
192 EXPORT_SYMBOL_GPL(stmpe_set_bits);
193
194 /**
195 * stmpe_block_read() - read multiple STMPE registers
196 * @stmpe: Device to read from
197 * @reg: First register
198 * @length: Number of registers
199 * @values: Buffer to write to
200 */
201 int stmpe_block_read(struct stmpe *stmpe, u8 reg, u8 length, u8 *values)
202 {
203 int ret;
204
205 mutex_lock(&stmpe->lock);
206 ret = __stmpe_block_read(stmpe, reg, length, values);
207 mutex_unlock(&stmpe->lock);
208
209 return ret;
210 }
211 EXPORT_SYMBOL_GPL(stmpe_block_read);
212
213 /**
214 * stmpe_block_write() - write multiple STMPE registers
215 * @stmpe: Device to write to
216 * @reg: First register
217 * @length: Number of registers
218 * @values: Values to write
219 */
220 int stmpe_block_write(struct stmpe *stmpe, u8 reg, u8 length,
221 const u8 *values)
222 {
223 int ret;
224
225 mutex_lock(&stmpe->lock);
226 ret = __stmpe_block_write(stmpe, reg, length, values);
227 mutex_unlock(&stmpe->lock);
228
229 return ret;
230 }
231 EXPORT_SYMBOL_GPL(stmpe_block_write);
232
233 /**
234 * stmpe_set_altfunc()- set the alternate function for STMPE pins
235 * @stmpe: Device to configure
236 * @pins: Bitmask of pins to affect
237 * @block: block to enable alternate functions for
238 *
239 * @pins is assumed to have a bit set for each of the bits whose alternate
240 * function is to be changed, numbered according to the GPIOXY numbers.
241 *
242 * If the GPIO module is not enabled, this function automatically enables it in
243 * order to perform the change.
244 */
245 int stmpe_set_altfunc(struct stmpe *stmpe, u32 pins, enum stmpe_block block)
246 {
247 struct stmpe_variant_info *variant = stmpe->variant;
248 u8 regaddr = stmpe->regs[STMPE_IDX_GPAFR_U_MSB];
249 int af_bits = variant->af_bits;
250 int numregs = DIV_ROUND_UP(stmpe->num_gpios * af_bits, 8);
251 int mask = (1 << af_bits) - 1;
252 u8 regs[numregs];
253 int af, afperreg, ret;
254
255 if (!variant->get_altfunc)
256 return 0;
257
258 afperreg = 8 / af_bits;
259 mutex_lock(&stmpe->lock);
260
261 ret = __stmpe_enable(stmpe, STMPE_BLOCK_GPIO);
262 if (ret < 0)
263 goto out;
264
265 ret = __stmpe_block_read(stmpe, regaddr, numregs, regs);
266 if (ret < 0)
267 goto out;
268
269 af = variant->get_altfunc(stmpe, block);
270
271 while (pins) {
272 int pin = __ffs(pins);
273 int regoffset = numregs - (pin / afperreg) - 1;
274 int pos = (pin % afperreg) * (8 / afperreg);
275
276 regs[regoffset] &= ~(mask << pos);
277 regs[regoffset] |= af << pos;
278
279 pins &= ~(1 << pin);
280 }
281
282 ret = __stmpe_block_write(stmpe, regaddr, numregs, regs);
283
284 out:
285 mutex_unlock(&stmpe->lock);
286 return ret;
287 }
288 EXPORT_SYMBOL_GPL(stmpe_set_altfunc);
289
290 /*
291 * GPIO (all variants)
292 */
293
294 static struct resource stmpe_gpio_resources[] = {
295 /* Start and end filled dynamically */
296 {
297 .flags = IORESOURCE_IRQ,
298 },
299 };
300
301 static const struct mfd_cell stmpe_gpio_cell = {
302 .name = "stmpe-gpio",
303 .of_compatible = "st,stmpe-gpio",
304 .resources = stmpe_gpio_resources,
305 .num_resources = ARRAY_SIZE(stmpe_gpio_resources),
306 };
307
308 static const struct mfd_cell stmpe_gpio_cell_noirq = {
309 .name = "stmpe-gpio",
310 .of_compatible = "st,stmpe-gpio",
311 /* gpio cell resources consist of an irq only so no resources here */
312 };
313
314 /*
315 * Keypad (1601, 2401, 2403)
316 */
317
318 static struct resource stmpe_keypad_resources[] = {
319 {
320 .name = "KEYPAD",
321 .flags = IORESOURCE_IRQ,
322 },
323 {
324 .name = "KEYPAD_OVER",
325 .flags = IORESOURCE_IRQ,
326 },
327 };
328
329 static const struct mfd_cell stmpe_keypad_cell = {
330 .name = "stmpe-keypad",
331 .of_compatible = "st,stmpe-keypad",
332 .resources = stmpe_keypad_resources,
333 .num_resources = ARRAY_SIZE(stmpe_keypad_resources),
334 };
335
336 /*
337 * STMPE801
338 */
339 static const u8 stmpe801_regs[] = {
340 [STMPE_IDX_CHIP_ID] = STMPE801_REG_CHIP_ID,
341 [STMPE_IDX_ICR_LSB] = STMPE801_REG_SYS_CTRL,
342 [STMPE_IDX_GPMR_LSB] = STMPE801_REG_GPIO_MP_STA,
343 [STMPE_IDX_GPSR_LSB] = STMPE801_REG_GPIO_SET_PIN,
344 [STMPE_IDX_GPCR_LSB] = STMPE801_REG_GPIO_SET_PIN,
345 [STMPE_IDX_GPDR_LSB] = STMPE801_REG_GPIO_DIR,
346 [STMPE_IDX_IEGPIOR_LSB] = STMPE801_REG_GPIO_INT_EN,
347 [STMPE_IDX_ISGPIOR_MSB] = STMPE801_REG_GPIO_INT_STA,
348
349 };
350
351 static struct stmpe_variant_block stmpe801_blocks[] = {
352 {
353 .cell = &stmpe_gpio_cell,
354 .irq = 0,
355 .block = STMPE_BLOCK_GPIO,
356 },
357 };
358
359 static struct stmpe_variant_block stmpe801_blocks_noirq[] = {
360 {
361 .cell = &stmpe_gpio_cell_noirq,
362 .block = STMPE_BLOCK_GPIO,
363 },
364 };
365
366 static int stmpe801_enable(struct stmpe *stmpe, unsigned int blocks,
367 bool enable)
368 {
369 if (blocks & STMPE_BLOCK_GPIO)
370 return 0;
371 else
372 return -EINVAL;
373 }
374
375 static struct stmpe_variant_info stmpe801 = {
376 .name = "stmpe801",
377 .id_val = STMPE801_ID,
378 .id_mask = 0xffff,
379 .num_gpios = 8,
380 .regs = stmpe801_regs,
381 .blocks = stmpe801_blocks,
382 .num_blocks = ARRAY_SIZE(stmpe801_blocks),
383 .num_irqs = STMPE801_NR_INTERNAL_IRQS,
384 .enable = stmpe801_enable,
385 };
386
387 static struct stmpe_variant_info stmpe801_noirq = {
388 .name = "stmpe801",
389 .id_val = STMPE801_ID,
390 .id_mask = 0xffff,
391 .num_gpios = 8,
392 .regs = stmpe801_regs,
393 .blocks = stmpe801_blocks_noirq,
394 .num_blocks = ARRAY_SIZE(stmpe801_blocks_noirq),
395 .enable = stmpe801_enable,
396 };
397
398 /*
399 * Touchscreen (STMPE811 or STMPE610)
400 */
401
402 static struct resource stmpe_ts_resources[] = {
403 {
404 .name = "TOUCH_DET",
405 .flags = IORESOURCE_IRQ,
406 },
407 {
408 .name = "FIFO_TH",
409 .flags = IORESOURCE_IRQ,
410 },
411 };
412
413 static const struct mfd_cell stmpe_ts_cell = {
414 .name = "stmpe-ts",
415 .of_compatible = "st,stmpe-ts",
416 .resources = stmpe_ts_resources,
417 .num_resources = ARRAY_SIZE(stmpe_ts_resources),
418 };
419
420 /*
421 * STMPE811 or STMPE610
422 */
423
424 static const u8 stmpe811_regs[] = {
425 [STMPE_IDX_CHIP_ID] = STMPE811_REG_CHIP_ID,
426 [STMPE_IDX_ICR_LSB] = STMPE811_REG_INT_CTRL,
427 [STMPE_IDX_IER_LSB] = STMPE811_REG_INT_EN,
428 [STMPE_IDX_ISR_MSB] = STMPE811_REG_INT_STA,
429 [STMPE_IDX_GPMR_LSB] = STMPE811_REG_GPIO_MP_STA,
430 [STMPE_IDX_GPSR_LSB] = STMPE811_REG_GPIO_SET_PIN,
431 [STMPE_IDX_GPCR_LSB] = STMPE811_REG_GPIO_CLR_PIN,
432 [STMPE_IDX_GPDR_LSB] = STMPE811_REG_GPIO_DIR,
433 [STMPE_IDX_GPRER_LSB] = STMPE811_REG_GPIO_RE,
434 [STMPE_IDX_GPFER_LSB] = STMPE811_REG_GPIO_FE,
435 [STMPE_IDX_GPAFR_U_MSB] = STMPE811_REG_GPIO_AF,
436 [STMPE_IDX_IEGPIOR_LSB] = STMPE811_REG_GPIO_INT_EN,
437 [STMPE_IDX_ISGPIOR_MSB] = STMPE811_REG_GPIO_INT_STA,
438 [STMPE_IDX_GPEDR_MSB] = STMPE811_REG_GPIO_ED,
439 };
440
441 static struct stmpe_variant_block stmpe811_blocks[] = {
442 {
443 .cell = &stmpe_gpio_cell,
444 .irq = STMPE811_IRQ_GPIOC,
445 .block = STMPE_BLOCK_GPIO,
446 },
447 {
448 .cell = &stmpe_ts_cell,
449 .irq = STMPE811_IRQ_TOUCH_DET,
450 .block = STMPE_BLOCK_TOUCHSCREEN,
451 },
452 };
453
454 static int stmpe811_enable(struct stmpe *stmpe, unsigned int blocks,
455 bool enable)
456 {
457 unsigned int mask = 0;
458
459 if (blocks & STMPE_BLOCK_GPIO)
460 mask |= STMPE811_SYS_CTRL2_GPIO_OFF;
461
462 if (blocks & STMPE_BLOCK_ADC)
463 mask |= STMPE811_SYS_CTRL2_ADC_OFF;
464
465 if (blocks & STMPE_BLOCK_TOUCHSCREEN)
466 mask |= STMPE811_SYS_CTRL2_TSC_OFF;
467
468 return __stmpe_set_bits(stmpe, STMPE811_REG_SYS_CTRL2, mask,
469 enable ? 0 : mask);
470 }
471
472 static int stmpe811_get_altfunc(struct stmpe *stmpe, enum stmpe_block block)
473 {
474 /* 0 for touchscreen, 1 for GPIO */
475 return block != STMPE_BLOCK_TOUCHSCREEN;
476 }
477
478 static struct stmpe_variant_info stmpe811 = {
479 .name = "stmpe811",
480 .id_val = 0x0811,
481 .id_mask = 0xffff,
482 .num_gpios = 8,
483 .af_bits = 1,
484 .regs = stmpe811_regs,
485 .blocks = stmpe811_blocks,
486 .num_blocks = ARRAY_SIZE(stmpe811_blocks),
487 .num_irqs = STMPE811_NR_INTERNAL_IRQS,
488 .enable = stmpe811_enable,
489 .get_altfunc = stmpe811_get_altfunc,
490 };
491
492 /* Similar to 811, except number of gpios */
493 static struct stmpe_variant_info stmpe610 = {
494 .name = "stmpe610",
495 .id_val = 0x0811,
496 .id_mask = 0xffff,
497 .num_gpios = 6,
498 .af_bits = 1,
499 .regs = stmpe811_regs,
500 .blocks = stmpe811_blocks,
501 .num_blocks = ARRAY_SIZE(stmpe811_blocks),
502 .num_irqs = STMPE811_NR_INTERNAL_IRQS,
503 .enable = stmpe811_enable,
504 .get_altfunc = stmpe811_get_altfunc,
505 };
506
507 /*
508 * STMPE1601
509 */
510
511 static const u8 stmpe1601_regs[] = {
512 [STMPE_IDX_CHIP_ID] = STMPE1601_REG_CHIP_ID,
513 [STMPE_IDX_ICR_LSB] = STMPE1601_REG_ICR_LSB,
514 [STMPE_IDX_IER_LSB] = STMPE1601_REG_IER_LSB,
515 [STMPE_IDX_ISR_MSB] = STMPE1601_REG_ISR_MSB,
516 [STMPE_IDX_GPMR_LSB] = STMPE1601_REG_GPIO_MP_LSB,
517 [STMPE_IDX_GPSR_LSB] = STMPE1601_REG_GPIO_SET_LSB,
518 [STMPE_IDX_GPCR_LSB] = STMPE1601_REG_GPIO_CLR_LSB,
519 [STMPE_IDX_GPDR_LSB] = STMPE1601_REG_GPIO_SET_DIR_LSB,
520 [STMPE_IDX_GPRER_LSB] = STMPE1601_REG_GPIO_RE_LSB,
521 [STMPE_IDX_GPFER_LSB] = STMPE1601_REG_GPIO_FE_LSB,
522 [STMPE_IDX_GPAFR_U_MSB] = STMPE1601_REG_GPIO_AF_U_MSB,
523 [STMPE_IDX_IEGPIOR_LSB] = STMPE1601_REG_INT_EN_GPIO_MASK_LSB,
524 [STMPE_IDX_ISGPIOR_MSB] = STMPE1601_REG_INT_STA_GPIO_MSB,
525 [STMPE_IDX_GPEDR_MSB] = STMPE1601_REG_GPIO_ED_MSB,
526 };
527
528 static struct stmpe_variant_block stmpe1601_blocks[] = {
529 {
530 .cell = &stmpe_gpio_cell,
531 .irq = STMPE1601_IRQ_GPIOC,
532 .block = STMPE_BLOCK_GPIO,
533 },
534 {
535 .cell = &stmpe_keypad_cell,
536 .irq = STMPE1601_IRQ_KEYPAD,
537 .block = STMPE_BLOCK_KEYPAD,
538 },
539 };
540
541 /* supported autosleep timeout delay (in msecs) */
542 static const int stmpe_autosleep_delay[] = {
543 4, 16, 32, 64, 128, 256, 512, 1024,
544 };
545
546 static int stmpe_round_timeout(int timeout)
547 {
548 int i;
549
550 for (i = 0; i < ARRAY_SIZE(stmpe_autosleep_delay); i++) {
551 if (stmpe_autosleep_delay[i] >= timeout)
552 return i;
553 }
554
555 /*
556 * requests for delays longer than supported should not return the
557 * longest supported delay
558 */
559 return -EINVAL;
560 }
561
562 static int stmpe_autosleep(struct stmpe *stmpe, int autosleep_timeout)
563 {
564 int ret;
565
566 if (!stmpe->variant->enable_autosleep)
567 return -ENOSYS;
568
569 mutex_lock(&stmpe->lock);
570 ret = stmpe->variant->enable_autosleep(stmpe, autosleep_timeout);
571 mutex_unlock(&stmpe->lock);
572
573 return ret;
574 }
575
576 /*
577 * Both stmpe 1601/2403 support same layout for autosleep
578 */
579 static int stmpe1601_autosleep(struct stmpe *stmpe,
580 int autosleep_timeout)
581 {
582 int ret, timeout;
583
584 /* choose the best available timeout */
585 timeout = stmpe_round_timeout(autosleep_timeout);
586 if (timeout < 0) {
587 dev_err(stmpe->dev, "invalid timeout\n");
588 return timeout;
589 }
590
591 ret = __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL2,
592 STMPE1601_AUTOSLEEP_TIMEOUT_MASK,
593 timeout);
594 if (ret < 0)
595 return ret;
596
597 return __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL2,
598 STPME1601_AUTOSLEEP_ENABLE,
599 STPME1601_AUTOSLEEP_ENABLE);
600 }
601
602 static int stmpe1601_enable(struct stmpe *stmpe, unsigned int blocks,
603 bool enable)
604 {
605 unsigned int mask = 0;
606
607 if (blocks & STMPE_BLOCK_GPIO)
608 mask |= STMPE1601_SYS_CTRL_ENABLE_GPIO;
609 else
610 mask &= ~STMPE1601_SYS_CTRL_ENABLE_GPIO;
611
612 if (blocks & STMPE_BLOCK_KEYPAD)
613 mask |= STMPE1601_SYS_CTRL_ENABLE_KPC;
614 else
615 mask &= ~STMPE1601_SYS_CTRL_ENABLE_KPC;
616
617 if (blocks & STMPE_BLOCK_PWM)
618 mask |= STMPE1601_SYS_CTRL_ENABLE_SPWM;
619 else
620 mask &= ~STMPE1601_SYS_CTRL_ENABLE_SPWM;
621
622 return __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL, mask,
623 enable ? mask : 0);
624 }
625
626 static int stmpe1601_get_altfunc(struct stmpe *stmpe, enum stmpe_block block)
627 {
628 switch (block) {
629 case STMPE_BLOCK_PWM:
630 return 2;
631
632 case STMPE_BLOCK_KEYPAD:
633 return 1;
634
635 case STMPE_BLOCK_GPIO:
636 default:
637 return 0;
638 }
639 }
640
641 static struct stmpe_variant_info stmpe1601 = {
642 .name = "stmpe1601",
643 .id_val = 0x0210,
644 .id_mask = 0xfff0, /* at least 0x0210 and 0x0212 */
645 .num_gpios = 16,
646 .af_bits = 2,
647 .regs = stmpe1601_regs,
648 .blocks = stmpe1601_blocks,
649 .num_blocks = ARRAY_SIZE(stmpe1601_blocks),
650 .num_irqs = STMPE1601_NR_INTERNAL_IRQS,
651 .enable = stmpe1601_enable,
652 .get_altfunc = stmpe1601_get_altfunc,
653 .enable_autosleep = stmpe1601_autosleep,
654 };
655
656 /*
657 * STMPE1801
658 */
659 static const u8 stmpe1801_regs[] = {
660 [STMPE_IDX_CHIP_ID] = STMPE1801_REG_CHIP_ID,
661 [STMPE_IDX_ICR_LSB] = STMPE1801_REG_INT_CTRL_LOW,
662 [STMPE_IDX_IER_LSB] = STMPE1801_REG_INT_EN_MASK_LOW,
663 [STMPE_IDX_ISR_LSB] = STMPE1801_REG_INT_STA_LOW,
664 [STMPE_IDX_GPMR_LSB] = STMPE1801_REG_GPIO_MP_LOW,
665 [STMPE_IDX_GPSR_LSB] = STMPE1801_REG_GPIO_SET_LOW,
666 [STMPE_IDX_GPCR_LSB] = STMPE1801_REG_GPIO_CLR_LOW,
667 [STMPE_IDX_GPDR_LSB] = STMPE1801_REG_GPIO_SET_DIR_LOW,
668 [STMPE_IDX_GPRER_LSB] = STMPE1801_REG_GPIO_RE_LOW,
669 [STMPE_IDX_GPFER_LSB] = STMPE1801_REG_GPIO_FE_LOW,
670 [STMPE_IDX_IEGPIOR_LSB] = STMPE1801_REG_INT_EN_GPIO_MASK_LOW,
671 [STMPE_IDX_ISGPIOR_LSB] = STMPE1801_REG_INT_STA_GPIO_LOW,
672 };
673
674 static struct stmpe_variant_block stmpe1801_blocks[] = {
675 {
676 .cell = &stmpe_gpio_cell,
677 .irq = STMPE1801_IRQ_GPIOC,
678 .block = STMPE_BLOCK_GPIO,
679 },
680 {
681 .cell = &stmpe_keypad_cell,
682 .irq = STMPE1801_IRQ_KEYPAD,
683 .block = STMPE_BLOCK_KEYPAD,
684 },
685 };
686
687 static int stmpe1801_enable(struct stmpe *stmpe, unsigned int blocks,
688 bool enable)
689 {
690 unsigned int mask = 0;
691 if (blocks & STMPE_BLOCK_GPIO)
692 mask |= STMPE1801_MSK_INT_EN_GPIO;
693
694 if (blocks & STMPE_BLOCK_KEYPAD)
695 mask |= STMPE1801_MSK_INT_EN_KPC;
696
697 return __stmpe_set_bits(stmpe, STMPE1801_REG_INT_EN_MASK_LOW, mask,
698 enable ? mask : 0);
699 }
700
701 static int stmpe1801_reset(struct stmpe *stmpe)
702 {
703 unsigned long timeout;
704 int ret = 0;
705
706 ret = __stmpe_set_bits(stmpe, STMPE1801_REG_SYS_CTRL,
707 STMPE1801_MSK_SYS_CTRL_RESET, STMPE1801_MSK_SYS_CTRL_RESET);
708 if (ret < 0)
709 return ret;
710
711 timeout = jiffies + msecs_to_jiffies(100);
712 while (time_before(jiffies, timeout)) {
713 ret = __stmpe_reg_read(stmpe, STMPE1801_REG_SYS_CTRL);
714 if (ret < 0)
715 return ret;
716 if (!(ret & STMPE1801_MSK_SYS_CTRL_RESET))
717 return 0;
718 usleep_range(100, 200);
719 }
720 return -EIO;
721 }
722
723 static struct stmpe_variant_info stmpe1801 = {
724 .name = "stmpe1801",
725 .id_val = STMPE1801_ID,
726 .id_mask = 0xfff0,
727 .num_gpios = 18,
728 .af_bits = 0,
729 .regs = stmpe1801_regs,
730 .blocks = stmpe1801_blocks,
731 .num_blocks = ARRAY_SIZE(stmpe1801_blocks),
732 .num_irqs = STMPE1801_NR_INTERNAL_IRQS,
733 .enable = stmpe1801_enable,
734 /* stmpe1801 do not have any gpio alternate function */
735 .get_altfunc = NULL,
736 };
737
738 /*
739 * STMPE24XX
740 */
741
742 static const u8 stmpe24xx_regs[] = {
743 [STMPE_IDX_CHIP_ID] = STMPE24XX_REG_CHIP_ID,
744 [STMPE_IDX_ICR_LSB] = STMPE24XX_REG_ICR_LSB,
745 [STMPE_IDX_IER_LSB] = STMPE24XX_REG_IER_LSB,
746 [STMPE_IDX_ISR_MSB] = STMPE24XX_REG_ISR_MSB,
747 [STMPE_IDX_GPMR_LSB] = STMPE24XX_REG_GPMR_LSB,
748 [STMPE_IDX_GPSR_LSB] = STMPE24XX_REG_GPSR_LSB,
749 [STMPE_IDX_GPCR_LSB] = STMPE24XX_REG_GPCR_LSB,
750 [STMPE_IDX_GPDR_LSB] = STMPE24XX_REG_GPDR_LSB,
751 [STMPE_IDX_GPRER_LSB] = STMPE24XX_REG_GPRER_LSB,
752 [STMPE_IDX_GPFER_LSB] = STMPE24XX_REG_GPFER_LSB,
753 [STMPE_IDX_GPAFR_U_MSB] = STMPE24XX_REG_GPAFR_U_MSB,
754 [STMPE_IDX_IEGPIOR_LSB] = STMPE24XX_REG_IEGPIOR_LSB,
755 [STMPE_IDX_ISGPIOR_MSB] = STMPE24XX_REG_ISGPIOR_MSB,
756 [STMPE_IDX_GPEDR_MSB] = STMPE24XX_REG_GPEDR_MSB,
757 };
758
759 static struct stmpe_variant_block stmpe24xx_blocks[] = {
760 {
761 .cell = &stmpe_gpio_cell,
762 .irq = STMPE24XX_IRQ_GPIOC,
763 .block = STMPE_BLOCK_GPIO,
764 },
765 {
766 .cell = &stmpe_keypad_cell,
767 .irq = STMPE24XX_IRQ_KEYPAD,
768 .block = STMPE_BLOCK_KEYPAD,
769 },
770 };
771
772 static int stmpe24xx_enable(struct stmpe *stmpe, unsigned int blocks,
773 bool enable)
774 {
775 unsigned int mask = 0;
776
777 if (blocks & STMPE_BLOCK_GPIO)
778 mask |= STMPE24XX_SYS_CTRL_ENABLE_GPIO;
779
780 if (blocks & STMPE_BLOCK_KEYPAD)
781 mask |= STMPE24XX_SYS_CTRL_ENABLE_KPC;
782
783 return __stmpe_set_bits(stmpe, STMPE24XX_REG_SYS_CTRL, mask,
784 enable ? mask : 0);
785 }
786
787 static int stmpe24xx_get_altfunc(struct stmpe *stmpe, enum stmpe_block block)
788 {
789 switch (block) {
790 case STMPE_BLOCK_ROTATOR:
791 return 2;
792
793 case STMPE_BLOCK_KEYPAD:
794 return 1;
795
796 case STMPE_BLOCK_GPIO:
797 default:
798 return 0;
799 }
800 }
801
802 static struct stmpe_variant_info stmpe2401 = {
803 .name = "stmpe2401",
804 .id_val = 0x0101,
805 .id_mask = 0xffff,
806 .num_gpios = 24,
807 .af_bits = 2,
808 .regs = stmpe24xx_regs,
809 .blocks = stmpe24xx_blocks,
810 .num_blocks = ARRAY_SIZE(stmpe24xx_blocks),
811 .num_irqs = STMPE24XX_NR_INTERNAL_IRQS,
812 .enable = stmpe24xx_enable,
813 .get_altfunc = stmpe24xx_get_altfunc,
814 };
815
816 static struct stmpe_variant_info stmpe2403 = {
817 .name = "stmpe2403",
818 .id_val = 0x0120,
819 .id_mask = 0xffff,
820 .num_gpios = 24,
821 .af_bits = 2,
822 .regs = stmpe24xx_regs,
823 .blocks = stmpe24xx_blocks,
824 .num_blocks = ARRAY_SIZE(stmpe24xx_blocks),
825 .num_irqs = STMPE24XX_NR_INTERNAL_IRQS,
826 .enable = stmpe24xx_enable,
827 .get_altfunc = stmpe24xx_get_altfunc,
828 .enable_autosleep = stmpe1601_autosleep, /* same as stmpe1601 */
829 };
830
831 static struct stmpe_variant_info *stmpe_variant_info[STMPE_NBR_PARTS] = {
832 [STMPE610] = &stmpe610,
833 [STMPE801] = &stmpe801,
834 [STMPE811] = &stmpe811,
835 [STMPE1601] = &stmpe1601,
836 [STMPE1801] = &stmpe1801,
837 [STMPE2401] = &stmpe2401,
838 [STMPE2403] = &stmpe2403,
839 };
840
841 /*
842 * These devices can be connected in a 'no-irq' configuration - the irq pin
843 * is not used and the device cannot interrupt the CPU. Here we only list
844 * devices which support this configuration - the driver will fail probing
845 * for any devices not listed here which are configured in this way.
846 */
847 static struct stmpe_variant_info *stmpe_noirq_variant_info[STMPE_NBR_PARTS] = {
848 [STMPE801] = &stmpe801_noirq,
849 };
850
851 static irqreturn_t stmpe_irq(int irq, void *data)
852 {
853 struct stmpe *stmpe = data;
854 struct stmpe_variant_info *variant = stmpe->variant;
855 int num = DIV_ROUND_UP(variant->num_irqs, 8);
856 u8 israddr;
857 u8 isr[num];
858 int ret;
859 int i;
860
861 if (variant->id_val == STMPE801_ID) {
862 int base = irq_create_mapping(stmpe->domain, 0);
863
864 handle_nested_irq(base);
865 return IRQ_HANDLED;
866 }
867
868 if (variant->id_val == STMPE1801_ID)
869 israddr = stmpe->regs[STMPE_IDX_ISR_LSB];
870 else
871 israddr = stmpe->regs[STMPE_IDX_ISR_MSB];
872
873 ret = stmpe_block_read(stmpe, israddr, num, isr);
874 if (ret < 0)
875 return IRQ_NONE;
876
877 for (i = 0; i < num; i++) {
878 int bank = num - i - 1;
879 u8 status = isr[i];
880 u8 clear;
881
882 status &= stmpe->ier[bank];
883 if (!status)
884 continue;
885
886 clear = status;
887 while (status) {
888 int bit = __ffs(status);
889 int line = bank * 8 + bit;
890 int nestedirq = irq_create_mapping(stmpe->domain, line);
891
892 handle_nested_irq(nestedirq);
893 status &= ~(1 << bit);
894 }
895
896 stmpe_reg_write(stmpe, israddr + i, clear);
897 }
898
899 return IRQ_HANDLED;
900 }
901
902 static void stmpe_irq_lock(struct irq_data *data)
903 {
904 struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
905
906 mutex_lock(&stmpe->irq_lock);
907 }
908
909 static void stmpe_irq_sync_unlock(struct irq_data *data)
910 {
911 struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
912 struct stmpe_variant_info *variant = stmpe->variant;
913 int num = DIV_ROUND_UP(variant->num_irqs, 8);
914 int i;
915
916 for (i = 0; i < num; i++) {
917 u8 new = stmpe->ier[i];
918 u8 old = stmpe->oldier[i];
919
920 if (new == old)
921 continue;
922
923 stmpe->oldier[i] = new;
924 stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_IER_LSB] - i, new);
925 }
926
927 mutex_unlock(&stmpe->irq_lock);
928 }
929
930 static void stmpe_irq_mask(struct irq_data *data)
931 {
932 struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
933 int offset = data->hwirq;
934 int regoffset = offset / 8;
935 int mask = 1 << (offset % 8);
936
937 stmpe->ier[regoffset] &= ~mask;
938 }
939
940 static void stmpe_irq_unmask(struct irq_data *data)
941 {
942 struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
943 int offset = data->hwirq;
944 int regoffset = offset / 8;
945 int mask = 1 << (offset % 8);
946
947 stmpe->ier[regoffset] |= mask;
948 }
949
950 static struct irq_chip stmpe_irq_chip = {
951 .name = "stmpe",
952 .irq_bus_lock = stmpe_irq_lock,
953 .irq_bus_sync_unlock = stmpe_irq_sync_unlock,
954 .irq_mask = stmpe_irq_mask,
955 .irq_unmask = stmpe_irq_unmask,
956 };
957
958 static int stmpe_irq_map(struct irq_domain *d, unsigned int virq,
959 irq_hw_number_t hwirq)
960 {
961 struct stmpe *stmpe = d->host_data;
962 struct irq_chip *chip = NULL;
963
964 if (stmpe->variant->id_val != STMPE801_ID)
965 chip = &stmpe_irq_chip;
966
967 irq_set_chip_data(virq, stmpe);
968 irq_set_chip_and_handler(virq, chip, handle_edge_irq);
969 irq_set_nested_thread(virq, 1);
970 #ifdef CONFIG_ARM
971 set_irq_flags(virq, IRQF_VALID);
972 #else
973 irq_set_noprobe(virq);
974 #endif
975
976 return 0;
977 }
978
979 static void stmpe_irq_unmap(struct irq_domain *d, unsigned int virq)
980 {
981 #ifdef CONFIG_ARM
982 set_irq_flags(virq, 0);
983 #endif
984 irq_set_chip_and_handler(virq, NULL, NULL);
985 irq_set_chip_data(virq, NULL);
986 }
987
988 static struct irq_domain_ops stmpe_irq_ops = {
989 .map = stmpe_irq_map,
990 .unmap = stmpe_irq_unmap,
991 .xlate = irq_domain_xlate_twocell,
992 };
993
994 static int stmpe_irq_init(struct stmpe *stmpe, struct device_node *np)
995 {
996 int base = 0;
997 int num_irqs = stmpe->variant->num_irqs;
998
999 stmpe->domain = irq_domain_add_simple(np, num_irqs, base,
1000 &stmpe_irq_ops, stmpe);
1001 if (!stmpe->domain) {
1002 dev_err(stmpe->dev, "Failed to create irqdomain\n");
1003 return -ENOSYS;
1004 }
1005
1006 return 0;
1007 }
1008
1009 static int stmpe_chip_init(struct stmpe *stmpe)
1010 {
1011 unsigned int irq_trigger = stmpe->pdata->irq_trigger;
1012 int autosleep_timeout = stmpe->pdata->autosleep_timeout;
1013 struct stmpe_variant_info *variant = stmpe->variant;
1014 u8 icr = 0;
1015 unsigned int id;
1016 u8 data[2];
1017 int ret;
1018
1019 ret = stmpe_block_read(stmpe, stmpe->regs[STMPE_IDX_CHIP_ID],
1020 ARRAY_SIZE(data), data);
1021 if (ret < 0)
1022 return ret;
1023
1024 id = (data[0] << 8) | data[1];
1025 if ((id & variant->id_mask) != variant->id_val) {
1026 dev_err(stmpe->dev, "unknown chip id: %#x\n", id);
1027 return -EINVAL;
1028 }
1029
1030 dev_info(stmpe->dev, "%s detected, chip id: %#x\n", variant->name, id);
1031
1032 /* Disable all modules -- subdrivers should enable what they need. */
1033 ret = stmpe_disable(stmpe, ~0);
1034 if (ret)
1035 return ret;
1036
1037 if (id == STMPE1801_ID) {
1038 ret = stmpe1801_reset(stmpe);
1039 if (ret < 0)
1040 return ret;
1041 }
1042
1043 if (stmpe->irq >= 0) {
1044 if (id == STMPE801_ID)
1045 icr = STMPE801_REG_SYS_CTRL_INT_EN;
1046 else
1047 icr = STMPE_ICR_LSB_GIM;
1048
1049 /* STMPE801 doesn't support Edge interrupts */
1050 if (id != STMPE801_ID) {
1051 if (irq_trigger == IRQF_TRIGGER_FALLING ||
1052 irq_trigger == IRQF_TRIGGER_RISING)
1053 icr |= STMPE_ICR_LSB_EDGE;
1054 }
1055
1056 if (irq_trigger == IRQF_TRIGGER_RISING ||
1057 irq_trigger == IRQF_TRIGGER_HIGH) {
1058 if (id == STMPE801_ID)
1059 icr |= STMPE801_REG_SYS_CTRL_INT_HI;
1060 else
1061 icr |= STMPE_ICR_LSB_HIGH;
1062 }
1063 }
1064
1065 if (stmpe->pdata->autosleep) {
1066 ret = stmpe_autosleep(stmpe, autosleep_timeout);
1067 if (ret)
1068 return ret;
1069 }
1070
1071 return stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_ICR_LSB], icr);
1072 }
1073
1074 static int stmpe_add_device(struct stmpe *stmpe, const struct mfd_cell *cell)
1075 {
1076 return mfd_add_devices(stmpe->dev, stmpe->pdata->id, cell, 1,
1077 NULL, 0, stmpe->domain);
1078 }
1079
1080 static int stmpe_devices_init(struct stmpe *stmpe)
1081 {
1082 struct stmpe_variant_info *variant = stmpe->variant;
1083 unsigned int platform_blocks = stmpe->pdata->blocks;
1084 int ret = -EINVAL;
1085 int i, j;
1086
1087 for (i = 0; i < variant->num_blocks; i++) {
1088 struct stmpe_variant_block *block = &variant->blocks[i];
1089
1090 if (!(platform_blocks & block->block))
1091 continue;
1092
1093 for (j = 0; j < block->cell->num_resources; j++) {
1094 struct resource *res =
1095 (struct resource *) &block->cell->resources[j];
1096
1097 /* Dynamically fill in a variant's IRQ. */
1098 if (res->flags & IORESOURCE_IRQ)
1099 res->start = res->end = block->irq + j;
1100 }
1101
1102 platform_blocks &= ~block->block;
1103 ret = stmpe_add_device(stmpe, block->cell);
1104 if (ret)
1105 return ret;
1106 }
1107
1108 if (platform_blocks)
1109 dev_warn(stmpe->dev,
1110 "platform wants blocks (%#x) not present on variant",
1111 platform_blocks);
1112
1113 return ret;
1114 }
1115
1116 static void stmpe_of_probe(struct stmpe_platform_data *pdata,
1117 struct device_node *np)
1118 {
1119 struct device_node *child;
1120
1121 pdata->id = of_alias_get_id(np, "stmpe-i2c");
1122 if (pdata->id < 0)
1123 pdata->id = -1;
1124
1125 pdata->irq_trigger = IRQF_TRIGGER_NONE;
1126
1127 of_property_read_u32(np, "st,autosleep-timeout",
1128 &pdata->autosleep_timeout);
1129
1130 pdata->autosleep = (pdata->autosleep_timeout) ? true : false;
1131
1132 for_each_child_of_node(np, child) {
1133 if (!strcmp(child->name, "stmpe_gpio")) {
1134 pdata->blocks |= STMPE_BLOCK_GPIO;
1135 } else if (!strcmp(child->name, "stmpe_keypad")) {
1136 pdata->blocks |= STMPE_BLOCK_KEYPAD;
1137 } else if (!strcmp(child->name, "stmpe_touchscreen")) {
1138 pdata->blocks |= STMPE_BLOCK_TOUCHSCREEN;
1139 } else if (!strcmp(child->name, "stmpe_adc")) {
1140 pdata->blocks |= STMPE_BLOCK_ADC;
1141 } else if (!strcmp(child->name, "stmpe_pwm")) {
1142 pdata->blocks |= STMPE_BLOCK_PWM;
1143 } else if (!strcmp(child->name, "stmpe_rotator")) {
1144 pdata->blocks |= STMPE_BLOCK_ROTATOR;
1145 }
1146 }
1147 }
1148
1149 /* Called from client specific probe routines */
1150 int stmpe_probe(struct stmpe_client_info *ci, int partnum)
1151 {
1152 struct stmpe_platform_data *pdata = dev_get_platdata(ci->dev);
1153 struct device_node *np = ci->dev->of_node;
1154 struct stmpe *stmpe;
1155 int ret;
1156
1157 if (!pdata) {
1158 if (!np)
1159 return -EINVAL;
1160
1161 pdata = devm_kzalloc(ci->dev, sizeof(*pdata), GFP_KERNEL);
1162 if (!pdata)
1163 return -ENOMEM;
1164
1165 stmpe_of_probe(pdata, np);
1166
1167 if (of_find_property(np, "interrupts", NULL) == NULL)
1168 ci->irq = -1;
1169 }
1170
1171 stmpe = devm_kzalloc(ci->dev, sizeof(struct stmpe), GFP_KERNEL);
1172 if (!stmpe)
1173 return -ENOMEM;
1174
1175 mutex_init(&stmpe->irq_lock);
1176 mutex_init(&stmpe->lock);
1177
1178 stmpe->dev = ci->dev;
1179 stmpe->client = ci->client;
1180 stmpe->pdata = pdata;
1181 stmpe->ci = ci;
1182 stmpe->partnum = partnum;
1183 stmpe->variant = stmpe_variant_info[partnum];
1184 stmpe->regs = stmpe->variant->regs;
1185 stmpe->num_gpios = stmpe->variant->num_gpios;
1186 stmpe->vcc = devm_regulator_get_optional(ci->dev, "vcc");
1187 if (!IS_ERR(stmpe->vcc)) {
1188 ret = regulator_enable(stmpe->vcc);
1189 if (ret)
1190 dev_warn(ci->dev, "failed to enable VCC supply\n");
1191 }
1192 stmpe->vio = devm_regulator_get_optional(ci->dev, "vio");
1193 if (!IS_ERR(stmpe->vio)) {
1194 ret = regulator_enable(stmpe->vio);
1195 if (ret)
1196 dev_warn(ci->dev, "failed to enable VIO supply\n");
1197 }
1198 dev_set_drvdata(stmpe->dev, stmpe);
1199
1200 if (ci->init)
1201 ci->init(stmpe);
1202
1203 if (pdata->irq_over_gpio) {
1204 ret = devm_gpio_request_one(ci->dev, pdata->irq_gpio,
1205 GPIOF_DIR_IN, "stmpe");
1206 if (ret) {
1207 dev_err(stmpe->dev, "failed to request IRQ GPIO: %d\n",
1208 ret);
1209 return ret;
1210 }
1211
1212 stmpe->irq = gpio_to_irq(pdata->irq_gpio);
1213 } else {
1214 stmpe->irq = ci->irq;
1215 }
1216
1217 if (stmpe->irq < 0) {
1218 /* use alternate variant info for no-irq mode, if supported */
1219 dev_info(stmpe->dev,
1220 "%s configured in no-irq mode by platform data\n",
1221 stmpe->variant->name);
1222 if (!stmpe_noirq_variant_info[stmpe->partnum]) {
1223 dev_err(stmpe->dev,
1224 "%s does not support no-irq mode!\n",
1225 stmpe->variant->name);
1226 return -ENODEV;
1227 }
1228 stmpe->variant = stmpe_noirq_variant_info[stmpe->partnum];
1229 } else if (pdata->irq_trigger == IRQF_TRIGGER_NONE) {
1230 pdata->irq_trigger = irq_get_trigger_type(stmpe->irq);
1231 }
1232
1233 ret = stmpe_chip_init(stmpe);
1234 if (ret)
1235 return ret;
1236
1237 if (stmpe->irq >= 0) {
1238 ret = stmpe_irq_init(stmpe, np);
1239 if (ret)
1240 return ret;
1241
1242 ret = devm_request_threaded_irq(ci->dev, stmpe->irq, NULL,
1243 stmpe_irq, pdata->irq_trigger | IRQF_ONESHOT,
1244 "stmpe", stmpe);
1245 if (ret) {
1246 dev_err(stmpe->dev, "failed to request IRQ: %d\n",
1247 ret);
1248 return ret;
1249 }
1250 }
1251
1252 ret = stmpe_devices_init(stmpe);
1253 if (!ret)
1254 return 0;
1255
1256 dev_err(stmpe->dev, "failed to add children\n");
1257 mfd_remove_devices(stmpe->dev);
1258
1259 return ret;
1260 }
1261
1262 int stmpe_remove(struct stmpe *stmpe)
1263 {
1264 if (!IS_ERR(stmpe->vio))
1265 regulator_disable(stmpe->vio);
1266 if (!IS_ERR(stmpe->vcc))
1267 regulator_disable(stmpe->vcc);
1268
1269 mfd_remove_devices(stmpe->dev);
1270
1271 return 0;
1272 }
1273
1274 #ifdef CONFIG_PM
1275 static int stmpe_suspend(struct device *dev)
1276 {
1277 struct stmpe *stmpe = dev_get_drvdata(dev);
1278
1279 if (stmpe->irq >= 0 && device_may_wakeup(dev))
1280 enable_irq_wake(stmpe->irq);
1281
1282 return 0;
1283 }
1284
1285 static int stmpe_resume(struct device *dev)
1286 {
1287 struct stmpe *stmpe = dev_get_drvdata(dev);
1288
1289 if (stmpe->irq >= 0 && device_may_wakeup(dev))
1290 disable_irq_wake(stmpe->irq);
1291
1292 return 0;
1293 }
1294
1295 const struct dev_pm_ops stmpe_dev_pm_ops = {
1296 .suspend = stmpe_suspend,
1297 .resume = stmpe_resume,
1298 };
1299 #endif
Linux with added FPC-III support