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Merge tag 'pci-v4.5-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci
[deliverable/linux.git] / drivers / mfd / stmpe.c
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[8];
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_GPPUR_LSB] = STMPE1601_REG_GPIO_PU_LSB,
523 [STMPE_IDX_GPAFR_U_MSB] = STMPE1601_REG_GPIO_AF_U_MSB,
524 [STMPE_IDX_IEGPIOR_LSB] = STMPE1601_REG_INT_EN_GPIO_MASK_LSB,
525 [STMPE_IDX_ISGPIOR_MSB] = STMPE1601_REG_INT_STA_GPIO_MSB,
526 [STMPE_IDX_GPEDR_MSB] = STMPE1601_REG_GPIO_ED_MSB,
527 };
528
529 static struct stmpe_variant_block stmpe1601_blocks[] = {
530 {
531 .cell = &stmpe_gpio_cell,
532 .irq = STMPE1601_IRQ_GPIOC,
533 .block = STMPE_BLOCK_GPIO,
534 },
535 {
536 .cell = &stmpe_keypad_cell,
537 .irq = STMPE1601_IRQ_KEYPAD,
538 .block = STMPE_BLOCK_KEYPAD,
539 },
540 };
541
542 /* supported autosleep timeout delay (in msecs) */
543 static const int stmpe_autosleep_delay[] = {
544 4, 16, 32, 64, 128, 256, 512, 1024,
545 };
546
547 static int stmpe_round_timeout(int timeout)
548 {
549 int i;
550
551 for (i = 0; i < ARRAY_SIZE(stmpe_autosleep_delay); i++) {
552 if (stmpe_autosleep_delay[i] >= timeout)
553 return i;
554 }
555
556 /*
557 * requests for delays longer than supported should not return the
558 * longest supported delay
559 */
560 return -EINVAL;
561 }
562
563 static int stmpe_autosleep(struct stmpe *stmpe, int autosleep_timeout)
564 {
565 int ret;
566
567 if (!stmpe->variant->enable_autosleep)
568 return -ENOSYS;
569
570 mutex_lock(&stmpe->lock);
571 ret = stmpe->variant->enable_autosleep(stmpe, autosleep_timeout);
572 mutex_unlock(&stmpe->lock);
573
574 return ret;
575 }
576
577 /*
578 * Both stmpe 1601/2403 support same layout for autosleep
579 */
580 static int stmpe1601_autosleep(struct stmpe *stmpe,
581 int autosleep_timeout)
582 {
583 int ret, timeout;
584
585 /* choose the best available timeout */
586 timeout = stmpe_round_timeout(autosleep_timeout);
587 if (timeout < 0) {
588 dev_err(stmpe->dev, "invalid timeout\n");
589 return timeout;
590 }
591
592 ret = __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL2,
593 STMPE1601_AUTOSLEEP_TIMEOUT_MASK,
594 timeout);
595 if (ret < 0)
596 return ret;
597
598 return __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL2,
599 STPME1601_AUTOSLEEP_ENABLE,
600 STPME1601_AUTOSLEEP_ENABLE);
601 }
602
603 static int stmpe1601_enable(struct stmpe *stmpe, unsigned int blocks,
604 bool enable)
605 {
606 unsigned int mask = 0;
607
608 if (blocks & STMPE_BLOCK_GPIO)
609 mask |= STMPE1601_SYS_CTRL_ENABLE_GPIO;
610 else
611 mask &= ~STMPE1601_SYS_CTRL_ENABLE_GPIO;
612
613 if (blocks & STMPE_BLOCK_KEYPAD)
614 mask |= STMPE1601_SYS_CTRL_ENABLE_KPC;
615 else
616 mask &= ~STMPE1601_SYS_CTRL_ENABLE_KPC;
617
618 if (blocks & STMPE_BLOCK_PWM)
619 mask |= STMPE1601_SYS_CTRL_ENABLE_SPWM;
620 else
621 mask &= ~STMPE1601_SYS_CTRL_ENABLE_SPWM;
622
623 return __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL, mask,
624 enable ? mask : 0);
625 }
626
627 static int stmpe1601_get_altfunc(struct stmpe *stmpe, enum stmpe_block block)
628 {
629 switch (block) {
630 case STMPE_BLOCK_PWM:
631 return 2;
632
633 case STMPE_BLOCK_KEYPAD:
634 return 1;
635
636 case STMPE_BLOCK_GPIO:
637 default:
638 return 0;
639 }
640 }
641
642 static struct stmpe_variant_info stmpe1601 = {
643 .name = "stmpe1601",
644 .id_val = 0x0210,
645 .id_mask = 0xfff0, /* at least 0x0210 and 0x0212 */
646 .num_gpios = 16,
647 .af_bits = 2,
648 .regs = stmpe1601_regs,
649 .blocks = stmpe1601_blocks,
650 .num_blocks = ARRAY_SIZE(stmpe1601_blocks),
651 .num_irqs = STMPE1601_NR_INTERNAL_IRQS,
652 .enable = stmpe1601_enable,
653 .get_altfunc = stmpe1601_get_altfunc,
654 .enable_autosleep = stmpe1601_autosleep,
655 };
656
657 /*
658 * STMPE1801
659 */
660 static const u8 stmpe1801_regs[] = {
661 [STMPE_IDX_CHIP_ID] = STMPE1801_REG_CHIP_ID,
662 [STMPE_IDX_ICR_LSB] = STMPE1801_REG_INT_CTRL_LOW,
663 [STMPE_IDX_IER_LSB] = STMPE1801_REG_INT_EN_MASK_LOW,
664 [STMPE_IDX_ISR_LSB] = STMPE1801_REG_INT_STA_LOW,
665 [STMPE_IDX_GPMR_LSB] = STMPE1801_REG_GPIO_MP_LOW,
666 [STMPE_IDX_GPSR_LSB] = STMPE1801_REG_GPIO_SET_LOW,
667 [STMPE_IDX_GPCR_LSB] = STMPE1801_REG_GPIO_CLR_LOW,
668 [STMPE_IDX_GPDR_LSB] = STMPE1801_REG_GPIO_SET_DIR_LOW,
669 [STMPE_IDX_GPRER_LSB] = STMPE1801_REG_GPIO_RE_LOW,
670 [STMPE_IDX_GPFER_LSB] = STMPE1801_REG_GPIO_FE_LOW,
671 [STMPE_IDX_GPPUR_LSB] = STMPE1801_REG_GPIO_PULL_UP_LOW,
672 [STMPE_IDX_IEGPIOR_LSB] = STMPE1801_REG_INT_EN_GPIO_MASK_LOW,
673 [STMPE_IDX_ISGPIOR_LSB] = STMPE1801_REG_INT_STA_GPIO_LOW,
674 };
675
676 static struct stmpe_variant_block stmpe1801_blocks[] = {
677 {
678 .cell = &stmpe_gpio_cell,
679 .irq = STMPE1801_IRQ_GPIOC,
680 .block = STMPE_BLOCK_GPIO,
681 },
682 {
683 .cell = &stmpe_keypad_cell,
684 .irq = STMPE1801_IRQ_KEYPAD,
685 .block = STMPE_BLOCK_KEYPAD,
686 },
687 };
688
689 static int stmpe1801_enable(struct stmpe *stmpe, unsigned int blocks,
690 bool enable)
691 {
692 unsigned int mask = 0;
693 if (blocks & STMPE_BLOCK_GPIO)
694 mask |= STMPE1801_MSK_INT_EN_GPIO;
695
696 if (blocks & STMPE_BLOCK_KEYPAD)
697 mask |= STMPE1801_MSK_INT_EN_KPC;
698
699 return __stmpe_set_bits(stmpe, STMPE1801_REG_INT_EN_MASK_LOW, mask,
700 enable ? mask : 0);
701 }
702
703 static int stmpe1801_reset(struct stmpe *stmpe)
704 {
705 unsigned long timeout;
706 int ret = 0;
707
708 ret = __stmpe_set_bits(stmpe, STMPE1801_REG_SYS_CTRL,
709 STMPE1801_MSK_SYS_CTRL_RESET, STMPE1801_MSK_SYS_CTRL_RESET);
710 if (ret < 0)
711 return ret;
712
713 timeout = jiffies + msecs_to_jiffies(100);
714 while (time_before(jiffies, timeout)) {
715 ret = __stmpe_reg_read(stmpe, STMPE1801_REG_SYS_CTRL);
716 if (ret < 0)
717 return ret;
718 if (!(ret & STMPE1801_MSK_SYS_CTRL_RESET))
719 return 0;
720 usleep_range(100, 200);
721 }
722 return -EIO;
723 }
724
725 static struct stmpe_variant_info stmpe1801 = {
726 .name = "stmpe1801",
727 .id_val = STMPE1801_ID,
728 .id_mask = 0xfff0,
729 .num_gpios = 18,
730 .af_bits = 0,
731 .regs = stmpe1801_regs,
732 .blocks = stmpe1801_blocks,
733 .num_blocks = ARRAY_SIZE(stmpe1801_blocks),
734 .num_irqs = STMPE1801_NR_INTERNAL_IRQS,
735 .enable = stmpe1801_enable,
736 /* stmpe1801 do not have any gpio alternate function */
737 .get_altfunc = NULL,
738 };
739
740 /*
741 * STMPE24XX
742 */
743
744 static const u8 stmpe24xx_regs[] = {
745 [STMPE_IDX_CHIP_ID] = STMPE24XX_REG_CHIP_ID,
746 [STMPE_IDX_ICR_LSB] = STMPE24XX_REG_ICR_LSB,
747 [STMPE_IDX_IER_LSB] = STMPE24XX_REG_IER_LSB,
748 [STMPE_IDX_ISR_MSB] = STMPE24XX_REG_ISR_MSB,
749 [STMPE_IDX_GPMR_LSB] = STMPE24XX_REG_GPMR_LSB,
750 [STMPE_IDX_GPSR_LSB] = STMPE24XX_REG_GPSR_LSB,
751 [STMPE_IDX_GPCR_LSB] = STMPE24XX_REG_GPCR_LSB,
752 [STMPE_IDX_GPDR_LSB] = STMPE24XX_REG_GPDR_LSB,
753 [STMPE_IDX_GPRER_LSB] = STMPE24XX_REG_GPRER_LSB,
754 [STMPE_IDX_GPFER_LSB] = STMPE24XX_REG_GPFER_LSB,
755 [STMPE_IDX_GPPUR_LSB] = STMPE24XX_REG_GPPUR_LSB,
756 [STMPE_IDX_GPPDR_LSB] = STMPE24XX_REG_GPPDR_LSB,
757 [STMPE_IDX_GPAFR_U_MSB] = STMPE24XX_REG_GPAFR_U_MSB,
758 [STMPE_IDX_IEGPIOR_LSB] = STMPE24XX_REG_IEGPIOR_LSB,
759 [STMPE_IDX_ISGPIOR_MSB] = STMPE24XX_REG_ISGPIOR_MSB,
760 [STMPE_IDX_GPEDR_MSB] = STMPE24XX_REG_GPEDR_MSB,
761 };
762
763 static struct stmpe_variant_block stmpe24xx_blocks[] = {
764 {
765 .cell = &stmpe_gpio_cell,
766 .irq = STMPE24XX_IRQ_GPIOC,
767 .block = STMPE_BLOCK_GPIO,
768 },
769 {
770 .cell = &stmpe_keypad_cell,
771 .irq = STMPE24XX_IRQ_KEYPAD,
772 .block = STMPE_BLOCK_KEYPAD,
773 },
774 };
775
776 static int stmpe24xx_enable(struct stmpe *stmpe, unsigned int blocks,
777 bool enable)
778 {
779 unsigned int mask = 0;
780
781 if (blocks & STMPE_BLOCK_GPIO)
782 mask |= STMPE24XX_SYS_CTRL_ENABLE_GPIO;
783
784 if (blocks & STMPE_BLOCK_KEYPAD)
785 mask |= STMPE24XX_SYS_CTRL_ENABLE_KPC;
786
787 return __stmpe_set_bits(stmpe, STMPE24XX_REG_SYS_CTRL, mask,
788 enable ? mask : 0);
789 }
790
791 static int stmpe24xx_get_altfunc(struct stmpe *stmpe, enum stmpe_block block)
792 {
793 switch (block) {
794 case STMPE_BLOCK_ROTATOR:
795 return 2;
796
797 case STMPE_BLOCK_KEYPAD:
798 case STMPE_BLOCK_PWM:
799 return 1;
800
801 case STMPE_BLOCK_GPIO:
802 default:
803 return 0;
804 }
805 }
806
807 static struct stmpe_variant_info stmpe2401 = {
808 .name = "stmpe2401",
809 .id_val = 0x0101,
810 .id_mask = 0xffff,
811 .num_gpios = 24,
812 .af_bits = 2,
813 .regs = stmpe24xx_regs,
814 .blocks = stmpe24xx_blocks,
815 .num_blocks = ARRAY_SIZE(stmpe24xx_blocks),
816 .num_irqs = STMPE24XX_NR_INTERNAL_IRQS,
817 .enable = stmpe24xx_enable,
818 .get_altfunc = stmpe24xx_get_altfunc,
819 };
820
821 static struct stmpe_variant_info stmpe2403 = {
822 .name = "stmpe2403",
823 .id_val = 0x0120,
824 .id_mask = 0xffff,
825 .num_gpios = 24,
826 .af_bits = 2,
827 .regs = stmpe24xx_regs,
828 .blocks = stmpe24xx_blocks,
829 .num_blocks = ARRAY_SIZE(stmpe24xx_blocks),
830 .num_irqs = STMPE24XX_NR_INTERNAL_IRQS,
831 .enable = stmpe24xx_enable,
832 .get_altfunc = stmpe24xx_get_altfunc,
833 .enable_autosleep = stmpe1601_autosleep, /* same as stmpe1601 */
834 };
835
836 static struct stmpe_variant_info *stmpe_variant_info[STMPE_NBR_PARTS] = {
837 [STMPE610] = &stmpe610,
838 [STMPE801] = &stmpe801,
839 [STMPE811] = &stmpe811,
840 [STMPE1601] = &stmpe1601,
841 [STMPE1801] = &stmpe1801,
842 [STMPE2401] = &stmpe2401,
843 [STMPE2403] = &stmpe2403,
844 };
845
846 /*
847 * These devices can be connected in a 'no-irq' configuration - the irq pin
848 * is not used and the device cannot interrupt the CPU. Here we only list
849 * devices which support this configuration - the driver will fail probing
850 * for any devices not listed here which are configured in this way.
851 */
852 static struct stmpe_variant_info *stmpe_noirq_variant_info[STMPE_NBR_PARTS] = {
853 [STMPE801] = &stmpe801_noirq,
854 };
855
856 static irqreturn_t stmpe_irq(int irq, void *data)
857 {
858 struct stmpe *stmpe = data;
859 struct stmpe_variant_info *variant = stmpe->variant;
860 int num = DIV_ROUND_UP(variant->num_irqs, 8);
861 u8 israddr;
862 u8 isr[3];
863 int ret;
864 int i;
865
866 if (variant->id_val == STMPE801_ID) {
867 int base = irq_create_mapping(stmpe->domain, 0);
868
869 handle_nested_irq(base);
870 return IRQ_HANDLED;
871 }
872
873 if (variant->id_val == STMPE1801_ID)
874 israddr = stmpe->regs[STMPE_IDX_ISR_LSB];
875 else
876 israddr = stmpe->regs[STMPE_IDX_ISR_MSB];
877
878 ret = stmpe_block_read(stmpe, israddr, num, isr);
879 if (ret < 0)
880 return IRQ_NONE;
881
882 for (i = 0; i < num; i++) {
883 int bank = num - i - 1;
884 u8 status = isr[i];
885 u8 clear;
886
887 status &= stmpe->ier[bank];
888 if (!status)
889 continue;
890
891 clear = status;
892 while (status) {
893 int bit = __ffs(status);
894 int line = bank * 8 + bit;
895 int nestedirq = irq_create_mapping(stmpe->domain, line);
896
897 handle_nested_irq(nestedirq);
898 status &= ~(1 << bit);
899 }
900
901 stmpe_reg_write(stmpe, israddr + i, clear);
902 }
903
904 return IRQ_HANDLED;
905 }
906
907 static void stmpe_irq_lock(struct irq_data *data)
908 {
909 struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
910
911 mutex_lock(&stmpe->irq_lock);
912 }
913
914 static void stmpe_irq_sync_unlock(struct irq_data *data)
915 {
916 struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
917 struct stmpe_variant_info *variant = stmpe->variant;
918 int num = DIV_ROUND_UP(variant->num_irqs, 8);
919 int i;
920
921 for (i = 0; i < num; i++) {
922 u8 new = stmpe->ier[i];
923 u8 old = stmpe->oldier[i];
924
925 if (new == old)
926 continue;
927
928 stmpe->oldier[i] = new;
929 stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_IER_LSB] - i, new);
930 }
931
932 mutex_unlock(&stmpe->irq_lock);
933 }
934
935 static void stmpe_irq_mask(struct irq_data *data)
936 {
937 struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
938 int offset = data->hwirq;
939 int regoffset = offset / 8;
940 int mask = 1 << (offset % 8);
941
942 stmpe->ier[regoffset] &= ~mask;
943 }
944
945 static void stmpe_irq_unmask(struct irq_data *data)
946 {
947 struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
948 int offset = data->hwirq;
949 int regoffset = offset / 8;
950 int mask = 1 << (offset % 8);
951
952 stmpe->ier[regoffset] |= mask;
953 }
954
955 static struct irq_chip stmpe_irq_chip = {
956 .name = "stmpe",
957 .irq_bus_lock = stmpe_irq_lock,
958 .irq_bus_sync_unlock = stmpe_irq_sync_unlock,
959 .irq_mask = stmpe_irq_mask,
960 .irq_unmask = stmpe_irq_unmask,
961 };
962
963 static int stmpe_irq_map(struct irq_domain *d, unsigned int virq,
964 irq_hw_number_t hwirq)
965 {
966 struct stmpe *stmpe = d->host_data;
967 struct irq_chip *chip = NULL;
968
969 if (stmpe->variant->id_val != STMPE801_ID)
970 chip = &stmpe_irq_chip;
971
972 irq_set_chip_data(virq, stmpe);
973 irq_set_chip_and_handler(virq, chip, handle_edge_irq);
974 irq_set_nested_thread(virq, 1);
975 irq_set_noprobe(virq);
976
977 return 0;
978 }
979
980 static void stmpe_irq_unmap(struct irq_domain *d, unsigned int virq)
981 {
982 irq_set_chip_and_handler(virq, NULL, NULL);
983 irq_set_chip_data(virq, NULL);
984 }
985
986 static const struct irq_domain_ops stmpe_irq_ops = {
987 .map = stmpe_irq_map,
988 .unmap = stmpe_irq_unmap,
989 .xlate = irq_domain_xlate_twocell,
990 };
991
992 static int stmpe_irq_init(struct stmpe *stmpe, struct device_node *np)
993 {
994 int base = 0;
995 int num_irqs = stmpe->variant->num_irqs;
996
997 stmpe->domain = irq_domain_add_simple(np, num_irqs, base,
998 &stmpe_irq_ops, stmpe);
999 if (!stmpe->domain) {
1000 dev_err(stmpe->dev, "Failed to create irqdomain\n");
1001 return -ENOSYS;
1002 }
1003
1004 return 0;
1005 }
1006
1007 static int stmpe_chip_init(struct stmpe *stmpe)
1008 {
1009 unsigned int irq_trigger = stmpe->pdata->irq_trigger;
1010 int autosleep_timeout = stmpe->pdata->autosleep_timeout;
1011 struct stmpe_variant_info *variant = stmpe->variant;
1012 u8 icr = 0;
1013 unsigned int id;
1014 u8 data[2];
1015 int ret;
1016
1017 ret = stmpe_block_read(stmpe, stmpe->regs[STMPE_IDX_CHIP_ID],
1018 ARRAY_SIZE(data), data);
1019 if (ret < 0)
1020 return ret;
1021
1022 id = (data[0] << 8) | data[1];
1023 if ((id & variant->id_mask) != variant->id_val) {
1024 dev_err(stmpe->dev, "unknown chip id: %#x\n", id);
1025 return -EINVAL;
1026 }
1027
1028 dev_info(stmpe->dev, "%s detected, chip id: %#x\n", variant->name, id);
1029
1030 /* Disable all modules -- subdrivers should enable what they need. */
1031 ret = stmpe_disable(stmpe, ~0);
1032 if (ret)
1033 return ret;
1034
1035 if (id == STMPE1801_ID) {
1036 ret = stmpe1801_reset(stmpe);
1037 if (ret < 0)
1038 return ret;
1039 }
1040
1041 if (stmpe->irq >= 0) {
1042 if (id == STMPE801_ID)
1043 icr = STMPE801_REG_SYS_CTRL_INT_EN;
1044 else
1045 icr = STMPE_ICR_LSB_GIM;
1046
1047 /* STMPE801 doesn't support Edge interrupts */
1048 if (id != STMPE801_ID) {
1049 if (irq_trigger == IRQF_TRIGGER_FALLING ||
1050 irq_trigger == IRQF_TRIGGER_RISING)
1051 icr |= STMPE_ICR_LSB_EDGE;
1052 }
1053
1054 if (irq_trigger == IRQF_TRIGGER_RISING ||
1055 irq_trigger == IRQF_TRIGGER_HIGH) {
1056 if (id == STMPE801_ID)
1057 icr |= STMPE801_REG_SYS_CTRL_INT_HI;
1058 else
1059 icr |= STMPE_ICR_LSB_HIGH;
1060 }
1061 }
1062
1063 if (stmpe->pdata->autosleep) {
1064 ret = stmpe_autosleep(stmpe, autosleep_timeout);
1065 if (ret)
1066 return ret;
1067 }
1068
1069 return stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_ICR_LSB], icr);
1070 }
1071
1072 static int stmpe_add_device(struct stmpe *stmpe, const struct mfd_cell *cell)
1073 {
1074 return mfd_add_devices(stmpe->dev, stmpe->pdata->id, cell, 1,
1075 NULL, 0, stmpe->domain);
1076 }
1077
1078 static int stmpe_devices_init(struct stmpe *stmpe)
1079 {
1080 struct stmpe_variant_info *variant = stmpe->variant;
1081 unsigned int platform_blocks = stmpe->pdata->blocks;
1082 int ret = -EINVAL;
1083 int i, j;
1084
1085 for (i = 0; i < variant->num_blocks; i++) {
1086 struct stmpe_variant_block *block = &variant->blocks[i];
1087
1088 if (!(platform_blocks & block->block))
1089 continue;
1090
1091 for (j = 0; j < block->cell->num_resources; j++) {
1092 struct resource *res =
1093 (struct resource *) &block->cell->resources[j];
1094
1095 /* Dynamically fill in a variant's IRQ. */
1096 if (res->flags & IORESOURCE_IRQ)
1097 res->start = res->end = block->irq + j;
1098 }
1099
1100 platform_blocks &= ~block->block;
1101 ret = stmpe_add_device(stmpe, block->cell);
1102 if (ret)
1103 return ret;
1104 }
1105
1106 if (platform_blocks)
1107 dev_warn(stmpe->dev,
1108 "platform wants blocks (%#x) not present on variant",
1109 platform_blocks);
1110
1111 return ret;
1112 }
1113
1114 static void stmpe_of_probe(struct stmpe_platform_data *pdata,
1115 struct device_node *np)
1116 {
1117 struct device_node *child;
1118
1119 pdata->id = of_alias_get_id(np, "stmpe-i2c");
1120 if (pdata->id < 0)
1121 pdata->id = -1;
1122
1123 pdata->irq_gpio = of_get_named_gpio_flags(np, "irq-gpio", 0,
1124 &pdata->irq_trigger);
1125 if (gpio_is_valid(pdata->irq_gpio))
1126 pdata->irq_over_gpio = 1;
1127 else
1128 pdata->irq_trigger = IRQF_TRIGGER_NONE;
1129
1130 of_property_read_u32(np, "st,autosleep-timeout",
1131 &pdata->autosleep_timeout);
1132
1133 pdata->autosleep = (pdata->autosleep_timeout) ? true : false;
1134
1135 for_each_child_of_node(np, child) {
1136 if (!strcmp(child->name, "stmpe_gpio")) {
1137 pdata->blocks |= STMPE_BLOCK_GPIO;
1138 } else if (!strcmp(child->name, "stmpe_keypad")) {
1139 pdata->blocks |= STMPE_BLOCK_KEYPAD;
1140 } else if (!strcmp(child->name, "stmpe_touchscreen")) {
1141 pdata->blocks |= STMPE_BLOCK_TOUCHSCREEN;
1142 } else if (!strcmp(child->name, "stmpe_adc")) {
1143 pdata->blocks |= STMPE_BLOCK_ADC;
1144 } else if (!strcmp(child->name, "stmpe_pwm")) {
1145 pdata->blocks |= STMPE_BLOCK_PWM;
1146 } else if (!strcmp(child->name, "stmpe_rotator")) {
1147 pdata->blocks |= STMPE_BLOCK_ROTATOR;
1148 }
1149 }
1150 }
1151
1152 /* Called from client specific probe routines */
1153 int stmpe_probe(struct stmpe_client_info *ci, enum stmpe_partnum partnum)
1154 {
1155 struct stmpe_platform_data *pdata = dev_get_platdata(ci->dev);
1156 struct device_node *np = ci->dev->of_node;
1157 struct stmpe *stmpe;
1158 int ret;
1159
1160 if (!pdata) {
1161 if (!np)
1162 return -EINVAL;
1163
1164 pdata = devm_kzalloc(ci->dev, sizeof(*pdata), GFP_KERNEL);
1165 if (!pdata)
1166 return -ENOMEM;
1167
1168 stmpe_of_probe(pdata, np);
1169
1170 if (of_find_property(np, "interrupts", NULL) == NULL)
1171 ci->irq = -1;
1172 }
1173
1174 stmpe = devm_kzalloc(ci->dev, sizeof(struct stmpe), GFP_KERNEL);
1175 if (!stmpe)
1176 return -ENOMEM;
1177
1178 mutex_init(&stmpe->irq_lock);
1179 mutex_init(&stmpe->lock);
1180
1181 stmpe->dev = ci->dev;
1182 stmpe->client = ci->client;
1183 stmpe->pdata = pdata;
1184 stmpe->ci = ci;
1185 stmpe->partnum = partnum;
1186 stmpe->variant = stmpe_variant_info[partnum];
1187 stmpe->regs = stmpe->variant->regs;
1188 stmpe->num_gpios = stmpe->variant->num_gpios;
1189 stmpe->vcc = devm_regulator_get_optional(ci->dev, "vcc");
1190 if (!IS_ERR(stmpe->vcc)) {
1191 ret = regulator_enable(stmpe->vcc);
1192 if (ret)
1193 dev_warn(ci->dev, "failed to enable VCC supply\n");
1194 }
1195 stmpe->vio = devm_regulator_get_optional(ci->dev, "vio");
1196 if (!IS_ERR(stmpe->vio)) {
1197 ret = regulator_enable(stmpe->vio);
1198 if (ret)
1199 dev_warn(ci->dev, "failed to enable VIO supply\n");
1200 }
1201 dev_set_drvdata(stmpe->dev, stmpe);
1202
1203 if (ci->init)
1204 ci->init(stmpe);
1205
1206 if (pdata->irq_over_gpio) {
1207 ret = devm_gpio_request_one(ci->dev, pdata->irq_gpio,
1208 GPIOF_DIR_IN, "stmpe");
1209 if (ret) {
1210 dev_err(stmpe->dev, "failed to request IRQ GPIO: %d\n",
1211 ret);
1212 return ret;
1213 }
1214
1215 stmpe->irq = gpio_to_irq(pdata->irq_gpio);
1216 } else {
1217 stmpe->irq = ci->irq;
1218 }
1219
1220 if (stmpe->irq < 0) {
1221 /* use alternate variant info for no-irq mode, if supported */
1222 dev_info(stmpe->dev,
1223 "%s configured in no-irq mode by platform data\n",
1224 stmpe->variant->name);
1225 if (!stmpe_noirq_variant_info[stmpe->partnum]) {
1226 dev_err(stmpe->dev,
1227 "%s does not support no-irq mode!\n",
1228 stmpe->variant->name);
1229 return -ENODEV;
1230 }
1231 stmpe->variant = stmpe_noirq_variant_info[stmpe->partnum];
1232 } else if (pdata->irq_trigger == IRQF_TRIGGER_NONE) {
1233 pdata->irq_trigger = irq_get_trigger_type(stmpe->irq);
1234 }
1235
1236 ret = stmpe_chip_init(stmpe);
1237 if (ret)
1238 return ret;
1239
1240 if (stmpe->irq >= 0) {
1241 ret = stmpe_irq_init(stmpe, np);
1242 if (ret)
1243 return ret;
1244
1245 ret = devm_request_threaded_irq(ci->dev, stmpe->irq, NULL,
1246 stmpe_irq, pdata->irq_trigger | IRQF_ONESHOT,
1247 "stmpe", stmpe);
1248 if (ret) {
1249 dev_err(stmpe->dev, "failed to request IRQ: %d\n",
1250 ret);
1251 return ret;
1252 }
1253 }
1254
1255 ret = stmpe_devices_init(stmpe);
1256 if (!ret)
1257 return 0;
1258
1259 dev_err(stmpe->dev, "failed to add children\n");
1260 mfd_remove_devices(stmpe->dev);
1261
1262 return ret;
1263 }
1264
1265 int stmpe_remove(struct stmpe *stmpe)
1266 {
1267 if (!IS_ERR(stmpe->vio))
1268 regulator_disable(stmpe->vio);
1269 if (!IS_ERR(stmpe->vcc))
1270 regulator_disable(stmpe->vcc);
1271
1272 mfd_remove_devices(stmpe->dev);
1273
1274 return 0;
1275 }
1276
1277 #ifdef CONFIG_PM
1278 static int stmpe_suspend(struct device *dev)
1279 {
1280 struct stmpe *stmpe = dev_get_drvdata(dev);
1281
1282 if (stmpe->irq >= 0 && device_may_wakeup(dev))
1283 enable_irq_wake(stmpe->irq);
1284
1285 return 0;
1286 }
1287
1288 static int stmpe_resume(struct device *dev)
1289 {
1290 struct stmpe *stmpe = dev_get_drvdata(dev);
1291
1292 if (stmpe->irq >= 0 && device_may_wakeup(dev))
1293 disable_irq_wake(stmpe->irq);
1294
1295 return 0;
1296 }
1297
1298 const struct dev_pm_ops stmpe_dev_pm_ops = {
1299 .suspend = stmpe_suspend,
1300 .resume = stmpe_resume,
1301 };
1302 #endif
Linux kernel - Deliverables
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