?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Linux 4.1.16
[linux/fpc-iii.git] / drivers / mfd / stmpe.c
blob2d7fae94c861013c594463705e05ea413275e4d0
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 return 1;
799
800 case STMPE_BLOCK_GPIO:
801 default:
802 return 0;
803 }
804 }
805
806 static struct stmpe_variant_info stmpe2401 = {
807 .name = "stmpe2401",
808 .id_val = 0x0101,
809 .id_mask = 0xffff,
810 .num_gpios = 24,
811 .af_bits = 2,
812 .regs = stmpe24xx_regs,
813 .blocks = stmpe24xx_blocks,
814 .num_blocks = ARRAY_SIZE(stmpe24xx_blocks),
815 .num_irqs = STMPE24XX_NR_INTERNAL_IRQS,
816 .enable = stmpe24xx_enable,
817 .get_altfunc = stmpe24xx_get_altfunc,
818 };
819
820 static struct stmpe_variant_info stmpe2403 = {
821 .name = "stmpe2403",
822 .id_val = 0x0120,
823 .id_mask = 0xffff,
824 .num_gpios = 24,
825 .af_bits = 2,
826 .regs = stmpe24xx_regs,
827 .blocks = stmpe24xx_blocks,
828 .num_blocks = ARRAY_SIZE(stmpe24xx_blocks),
829 .num_irqs = STMPE24XX_NR_INTERNAL_IRQS,
830 .enable = stmpe24xx_enable,
831 .get_altfunc = stmpe24xx_get_altfunc,
832 .enable_autosleep = stmpe1601_autosleep, /* same as stmpe1601 */
833 };
834
835 static struct stmpe_variant_info *stmpe_variant_info[STMPE_NBR_PARTS] = {
836 [STMPE610] = &stmpe610,
837 [STMPE801] = &stmpe801,
838 [STMPE811] = &stmpe811,
839 [STMPE1601] = &stmpe1601,
840 [STMPE1801] = &stmpe1801,
841 [STMPE2401] = &stmpe2401,
842 [STMPE2403] = &stmpe2403,
843 };
844
845 /*
846 * These devices can be connected in a 'no-irq' configuration - the irq pin
847 * is not used and the device cannot interrupt the CPU. Here we only list
848 * devices which support this configuration - the driver will fail probing
849 * for any devices not listed here which are configured in this way.
850 */
851 static struct stmpe_variant_info *stmpe_noirq_variant_info[STMPE_NBR_PARTS] = {
852 [STMPE801] = &stmpe801_noirq,
853 };
854
855 static irqreturn_t stmpe_irq(int irq, void *data)
856 {
857 struct stmpe *stmpe = data;
858 struct stmpe_variant_info *variant = stmpe->variant;
859 int num = DIV_ROUND_UP(variant->num_irqs, 8);
860 u8 israddr;
861 u8 isr[3];
862 int ret;
863 int i;
864
865 if (variant->id_val == STMPE801_ID) {
866 int base = irq_create_mapping(stmpe->domain, 0);
867
868 handle_nested_irq(base);
869 return IRQ_HANDLED;
870 }
871
872 if (variant->id_val == STMPE1801_ID)
873 israddr = stmpe->regs[STMPE_IDX_ISR_LSB];
874 else
875 israddr = stmpe->regs[STMPE_IDX_ISR_MSB];
876
877 ret = stmpe_block_read(stmpe, israddr, num, isr);
878 if (ret < 0)
879 return IRQ_NONE;
880
881 for (i = 0; i < num; i++) {
882 int bank = num - i - 1;
883 u8 status = isr[i];
884 u8 clear;
885
886 status &= stmpe->ier[bank];
887 if (!status)
888 continue;
889
890 clear = status;
891 while (status) {
892 int bit = __ffs(status);
893 int line = bank * 8 + bit;
894 int nestedirq = irq_create_mapping(stmpe->domain, line);
895
896 handle_nested_irq(nestedirq);
897 status &= ~(1 << bit);
898 }
899
900 stmpe_reg_write(stmpe, israddr + i, clear);
901 }
902
903 return IRQ_HANDLED;
904 }
905
906 static void stmpe_irq_lock(struct irq_data *data)
907 {
908 struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
909
910 mutex_lock(&stmpe->irq_lock);
911 }
912
913 static void stmpe_irq_sync_unlock(struct irq_data *data)
914 {
915 struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
916 struct stmpe_variant_info *variant = stmpe->variant;
917 int num = DIV_ROUND_UP(variant->num_irqs, 8);
918 int i;
919
920 for (i = 0; i < num; i++) {
921 u8 new = stmpe->ier[i];
922 u8 old = stmpe->oldier[i];
923
924 if (new == old)
925 continue;
926
927 stmpe->oldier[i] = new;
928 stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_IER_LSB] - i, new);
929 }
930
931 mutex_unlock(&stmpe->irq_lock);
932 }
933
934 static void stmpe_irq_mask(struct irq_data *data)
935 {
936 struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
937 int offset = data->hwirq;
938 int regoffset = offset / 8;
939 int mask = 1 << (offset % 8);
940
941 stmpe->ier[regoffset] &= ~mask;
942 }
943
944 static void stmpe_irq_unmask(struct irq_data *data)
945 {
946 struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
947 int offset = data->hwirq;
948 int regoffset = offset / 8;
949 int mask = 1 << (offset % 8);
950
951 stmpe->ier[regoffset] |= mask;
952 }
953
954 static struct irq_chip stmpe_irq_chip = {
955 .name = "stmpe",
956 .irq_bus_lock = stmpe_irq_lock,
957 .irq_bus_sync_unlock = stmpe_irq_sync_unlock,
958 .irq_mask = stmpe_irq_mask,
959 .irq_unmask = stmpe_irq_unmask,
960 };
961
962 static int stmpe_irq_map(struct irq_domain *d, unsigned int virq,
963 irq_hw_number_t hwirq)
964 {
965 struct stmpe *stmpe = d->host_data;
966 struct irq_chip *chip = NULL;
967
968 if (stmpe->variant->id_val != STMPE801_ID)
969 chip = &stmpe_irq_chip;
970
971 irq_set_chip_data(virq, stmpe);
972 irq_set_chip_and_handler(virq, chip, handle_edge_irq);
973 irq_set_nested_thread(virq, 1);
974 #ifdef CONFIG_ARM
975 set_irq_flags(virq, IRQF_VALID);
976 #else
977 irq_set_noprobe(virq);
978 #endif
979
980 return 0;
981 }
982
983 static void stmpe_irq_unmap(struct irq_domain *d, unsigned int virq)
984 {
985 #ifdef CONFIG_ARM
986 set_irq_flags(virq, 0);
987 #endif
988 irq_set_chip_and_handler(virq, NULL, NULL);
989 irq_set_chip_data(virq, NULL);
990 }
991
992 static struct irq_domain_ops stmpe_irq_ops = {
993 .map = stmpe_irq_map,
994 .unmap = stmpe_irq_unmap,
995 .xlate = irq_domain_xlate_twocell,
996 };
997
998 static int stmpe_irq_init(struct stmpe *stmpe, struct device_node *np)
999 {
1000 int base = 0;
1001 int num_irqs = stmpe->variant->num_irqs;
1002
1003 stmpe->domain = irq_domain_add_simple(np, num_irqs, base,
1004 &stmpe_irq_ops, stmpe);
1005 if (!stmpe->domain) {
1006 dev_err(stmpe->dev, "Failed to create irqdomain\n");
1007 return -ENOSYS;
1008 }
1009
1010 return 0;
1011 }
1012
1013 static int stmpe_chip_init(struct stmpe *stmpe)
1014 {
1015 unsigned int irq_trigger = stmpe->pdata->irq_trigger;
1016 int autosleep_timeout = stmpe->pdata->autosleep_timeout;
1017 struct stmpe_variant_info *variant = stmpe->variant;
1018 u8 icr = 0;
1019 unsigned int id;
1020 u8 data[2];
1021 int ret;
1022
1023 ret = stmpe_block_read(stmpe, stmpe->regs[STMPE_IDX_CHIP_ID],
1024 ARRAY_SIZE(data), data);
1025 if (ret < 0)
1026 return ret;
1027
1028 id = (data[0] << 8) | data[1];
1029 if ((id & variant->id_mask) != variant->id_val) {
1030 dev_err(stmpe->dev, "unknown chip id: %#x\n", id);
1031 return -EINVAL;
1032 }
1033
1034 dev_info(stmpe->dev, "%s detected, chip id: %#x\n", variant->name, id);
1035
1036 /* Disable all modules -- subdrivers should enable what they need. */
1037 ret = stmpe_disable(stmpe, ~0);
1038 if (ret)
1039 return ret;
1040
1041 if (id == STMPE1801_ID) {
1042 ret = stmpe1801_reset(stmpe);
1043 if (ret < 0)
1044 return ret;
1045 }
1046
1047 if (stmpe->irq >= 0) {
1048 if (id == STMPE801_ID)
1049 icr = STMPE801_REG_SYS_CTRL_INT_EN;
1050 else
1051 icr = STMPE_ICR_LSB_GIM;
1052
1053 /* STMPE801 doesn't support Edge interrupts */
1054 if (id != STMPE801_ID) {
1055 if (irq_trigger == IRQF_TRIGGER_FALLING ||
1056 irq_trigger == IRQF_TRIGGER_RISING)
1057 icr |= STMPE_ICR_LSB_EDGE;
1058 }
1059
1060 if (irq_trigger == IRQF_TRIGGER_RISING ||
1061 irq_trigger == IRQF_TRIGGER_HIGH) {
1062 if (id == STMPE801_ID)
1063 icr |= STMPE801_REG_SYS_CTRL_INT_HI;
1064 else
1065 icr |= STMPE_ICR_LSB_HIGH;
1066 }
1067 }
1068
1069 if (stmpe->pdata->autosleep) {
1070 ret = stmpe_autosleep(stmpe, autosleep_timeout);
1071 if (ret)
1072 return ret;
1073 }
1074
1075 return stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_ICR_LSB], icr);
1076 }
1077
1078 static int stmpe_add_device(struct stmpe *stmpe, const struct mfd_cell *cell)
1079 {
1080 return mfd_add_devices(stmpe->dev, stmpe->pdata->id, cell, 1,
1081 NULL, 0, stmpe->domain);
1082 }
1083
1084 static int stmpe_devices_init(struct stmpe *stmpe)
1085 {
1086 struct stmpe_variant_info *variant = stmpe->variant;
1087 unsigned int platform_blocks = stmpe->pdata->blocks;
1088 int ret = -EINVAL;
1089 int i, j;
1090
1091 for (i = 0; i < variant->num_blocks; i++) {
1092 struct stmpe_variant_block *block = &variant->blocks[i];
1093
1094 if (!(platform_blocks & block->block))
1095 continue;
1096
1097 for (j = 0; j < block->cell->num_resources; j++) {
1098 struct resource *res =
1099 (struct resource *) &block->cell->resources[j];
1100
1101 /* Dynamically fill in a variant's IRQ. */
1102 if (res->flags & IORESOURCE_IRQ)
1103 res->start = res->end = block->irq + j;
1104 }
1105
1106 platform_blocks &= ~block->block;
1107 ret = stmpe_add_device(stmpe, block->cell);
1108 if (ret)
1109 return ret;
1110 }
1111
1112 if (platform_blocks)
1113 dev_warn(stmpe->dev,
1114 "platform wants blocks (%#x) not present on variant",
1115 platform_blocks);
1116
1117 return ret;
1118 }
1119
1120 static void stmpe_of_probe(struct stmpe_platform_data *pdata,
1121 struct device_node *np)
1122 {
1123 struct device_node *child;
1124
1125 pdata->id = of_alias_get_id(np, "stmpe-i2c");
1126 if (pdata->id < 0)
1127 pdata->id = -1;
1128
1129 pdata->irq_gpio = of_get_named_gpio_flags(np, "irq-gpio", 0,
1130 &pdata->irq_trigger);
1131 if (gpio_is_valid(pdata->irq_gpio))
1132 pdata->irq_over_gpio = 1;
1133 else
1134 pdata->irq_trigger = IRQF_TRIGGER_NONE;
1135
1136 of_property_read_u32(np, "st,autosleep-timeout",
1137 &pdata->autosleep_timeout);
1138
1139 pdata->autosleep = (pdata->autosleep_timeout) ? true : false;
1140
1141 for_each_child_of_node(np, child) {
1142 if (!strcmp(child->name, "stmpe_gpio")) {
1143 pdata->blocks |= STMPE_BLOCK_GPIO;
1144 } else if (!strcmp(child->name, "stmpe_keypad")) {
1145 pdata->blocks |= STMPE_BLOCK_KEYPAD;
1146 } else if (!strcmp(child->name, "stmpe_touchscreen")) {
1147 pdata->blocks |= STMPE_BLOCK_TOUCHSCREEN;
1148 } else if (!strcmp(child->name, "stmpe_adc")) {
1149 pdata->blocks |= STMPE_BLOCK_ADC;
1150 } else if (!strcmp(child->name, "stmpe_pwm")) {
1151 pdata->blocks |= STMPE_BLOCK_PWM;
1152 } else if (!strcmp(child->name, "stmpe_rotator")) {
1153 pdata->blocks |= STMPE_BLOCK_ROTATOR;
1154 }
1155 }
1156 }
1157
1158 /* Called from client specific probe routines */
1159 int stmpe_probe(struct stmpe_client_info *ci, enum stmpe_partnum partnum)
1160 {
1161 struct stmpe_platform_data *pdata = dev_get_platdata(ci->dev);
1162 struct device_node *np = ci->dev->of_node;
1163 struct stmpe *stmpe;
1164 int ret;
1165
1166 if (!pdata) {
1167 if (!np)
1168 return -EINVAL;
1169
1170 pdata = devm_kzalloc(ci->dev, sizeof(*pdata), GFP_KERNEL);
1171 if (!pdata)
1172 return -ENOMEM;
1173
1174 stmpe_of_probe(pdata, np);
1175
1176 if (of_find_property(np, "interrupts", NULL) == NULL)
1177 ci->irq = -1;
1178 }
1179
1180 stmpe = devm_kzalloc(ci->dev, sizeof(struct stmpe), GFP_KERNEL);
1181 if (!stmpe)
1182 return -ENOMEM;
1183
1184 mutex_init(&stmpe->irq_lock);
1185 mutex_init(&stmpe->lock);
1186
1187 stmpe->dev = ci->dev;
1188 stmpe->client = ci->client;
1189 stmpe->pdata = pdata;
1190 stmpe->ci = ci;
1191 stmpe->partnum = partnum;
1192 stmpe->variant = stmpe_variant_info[partnum];
1193 stmpe->regs = stmpe->variant->regs;
1194 stmpe->num_gpios = stmpe->variant->num_gpios;
1195 stmpe->vcc = devm_regulator_get_optional(ci->dev, "vcc");
1196 if (!IS_ERR(stmpe->vcc)) {
1197 ret = regulator_enable(stmpe->vcc);
1198 if (ret)
1199 dev_warn(ci->dev, "failed to enable VCC supply\n");
1200 }
1201 stmpe->vio = devm_regulator_get_optional(ci->dev, "vio");
1202 if (!IS_ERR(stmpe->vio)) {
1203 ret = regulator_enable(stmpe->vio);
1204 if (ret)
1205 dev_warn(ci->dev, "failed to enable VIO supply\n");
1206 }
1207 dev_set_drvdata(stmpe->dev, stmpe);
1208
1209 if (ci->init)
1210 ci->init(stmpe);
1211
1212 if (pdata->irq_over_gpio) {
1213 ret = devm_gpio_request_one(ci->dev, pdata->irq_gpio,
1214 GPIOF_DIR_IN, "stmpe");
1215 if (ret) {
1216 dev_err(stmpe->dev, "failed to request IRQ GPIO: %d\n",
1217 ret);
1218 return ret;
1219 }
1220
1221 stmpe->irq = gpio_to_irq(pdata->irq_gpio);
1222 } else {
1223 stmpe->irq = ci->irq;
1224 }
1225
1226 if (stmpe->irq < 0) {
1227 /* use alternate variant info for no-irq mode, if supported */
1228 dev_info(stmpe->dev,
1229 "%s configured in no-irq mode by platform data\n",
1230 stmpe->variant->name);
1231 if (!stmpe_noirq_variant_info[stmpe->partnum]) {
1232 dev_err(stmpe->dev,
1233 "%s does not support no-irq mode!\n",
1234 stmpe->variant->name);
1235 return -ENODEV;
1236 }
1237 stmpe->variant = stmpe_noirq_variant_info[stmpe->partnum];
1238 } else if (pdata->irq_trigger == IRQF_TRIGGER_NONE) {
1239 pdata->irq_trigger = irq_get_trigger_type(stmpe->irq);
1240 }
1241
1242 ret = stmpe_chip_init(stmpe);
1243 if (ret)
1244 return ret;
1245
1246 if (stmpe->irq >= 0) {
1247 ret = stmpe_irq_init(stmpe, np);
1248 if (ret)
1249 return ret;
1250
1251 ret = devm_request_threaded_irq(ci->dev, stmpe->irq, NULL,
1252 stmpe_irq, pdata->irq_trigger | IRQF_ONESHOT,
1253 "stmpe", stmpe);
1254 if (ret) {
1255 dev_err(stmpe->dev, "failed to request IRQ: %d\n",
1256 ret);
1257 return ret;
1258 }
1259 }
1260
1261 ret = stmpe_devices_init(stmpe);
1262 if (!ret)
1263 return 0;
1264
1265 dev_err(stmpe->dev, "failed to add children\n");
1266 mfd_remove_devices(stmpe->dev);
1267
1268 return ret;
1269 }
1270
1271 int stmpe_remove(struct stmpe *stmpe)
1272 {
1273 if (!IS_ERR(stmpe->vio))
1274 regulator_disable(stmpe->vio);
1275 if (!IS_ERR(stmpe->vcc))
1276 regulator_disable(stmpe->vcc);
1277
1278 mfd_remove_devices(stmpe->dev);
1279
1280 return 0;
1281 }
1282
1283 #ifdef CONFIG_PM
1284 static int stmpe_suspend(struct device *dev)
1285 {
1286 struct stmpe *stmpe = dev_get_drvdata(dev);
1287
1288 if (stmpe->irq >= 0 && device_may_wakeup(dev))
1289 enable_irq_wake(stmpe->irq);
1290
1291 return 0;
1292 }
1293
1294 static int stmpe_resume(struct device *dev)
1295 {
1296 struct stmpe *stmpe = dev_get_drvdata(dev);
1297
1298 if (stmpe->irq >= 0 && device_may_wakeup(dev))
1299 disable_irq_wake(stmpe->irq);
1300
1301 return 0;
1302 }
1303
1304 const struct dev_pm_ops stmpe_dev_pm_ops = {
1305 .suspend = stmpe_suspend,
1306 .resume = stmpe_resume,
1307 };
1308 #endif
Linux with added FPC-III support