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fb: adv7393: off by one in probe function
[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 /**
27 * struct stmpe_platform_data - STMPE platform data
28 * @id: device id to distinguish between multiple STMPEs on the same board
29 * @blocks: bitmask of blocks to enable (use STMPE_BLOCK_*)
30 * @irq_trigger: IRQ trigger to use for the interrupt to the host
31 * @autosleep: bool to enable/disable stmpe autosleep
32 * @autosleep_timeout: inactivity timeout in milliseconds for autosleep
33 * @irq_over_gpio: true if gpio is used to get irq
34 * @irq_gpio: gpio number over which irq will be requested (significant only if
35 * irq_over_gpio is true)
36 */
37 struct stmpe_platform_data {
38 int id;
39 unsigned int blocks;
40 unsigned int irq_trigger;
41 bool autosleep;
42 bool irq_over_gpio;
43 int irq_gpio;
44 int autosleep_timeout;
45 };
46
47 static int __stmpe_enable(struct stmpe *stmpe, unsigned int blocks)
48 {
49 return stmpe->variant->enable(stmpe, blocks, true);
50 }
51
52 static int __stmpe_disable(struct stmpe *stmpe, unsigned int blocks)
53 {
54 return stmpe->variant->enable(stmpe, blocks, false);
55 }
56
57 static int __stmpe_reg_read(struct stmpe *stmpe, u8 reg)
58 {
59 int ret;
60
61 ret = stmpe->ci->read_byte(stmpe, reg);
62 if (ret < 0)
63 dev_err(stmpe->dev, "failed to read reg %#x: %d\n", reg, ret);
64
65 dev_vdbg(stmpe->dev, "rd: reg %#x => data %#x\n", reg, ret);
66
67 return ret;
68 }
69
70 static int __stmpe_reg_write(struct stmpe *stmpe, u8 reg, u8 val)
71 {
72 int ret;
73
74 dev_vdbg(stmpe->dev, "wr: reg %#x <= %#x\n", reg, val);
75
76 ret = stmpe->ci->write_byte(stmpe, reg, val);
77 if (ret < 0)
78 dev_err(stmpe->dev, "failed to write reg %#x: %d\n", reg, ret);
79
80 return ret;
81 }
82
83 static int __stmpe_set_bits(struct stmpe *stmpe, u8 reg, u8 mask, u8 val)
84 {
85 int ret;
86
87 ret = __stmpe_reg_read(stmpe, reg);
88 if (ret < 0)
89 return ret;
90
91 ret &= ~mask;
92 ret |= val;
93
94 return __stmpe_reg_write(stmpe, reg, ret);
95 }
96
97 static int __stmpe_block_read(struct stmpe *stmpe, u8 reg, u8 length,
98 u8 *values)
99 {
100 int ret;
101
102 ret = stmpe->ci->read_block(stmpe, reg, length, values);
103 if (ret < 0)
104 dev_err(stmpe->dev, "failed to read regs %#x: %d\n", reg, ret);
105
106 dev_vdbg(stmpe->dev, "rd: reg %#x (%d) => ret %#x\n", reg, length, ret);
107 stmpe_dump_bytes("stmpe rd: ", values, length);
108
109 return ret;
110 }
111
112 static int __stmpe_block_write(struct stmpe *stmpe, u8 reg, u8 length,
113 const u8 *values)
114 {
115 int ret;
116
117 dev_vdbg(stmpe->dev, "wr: regs %#x (%d)\n", reg, length);
118 stmpe_dump_bytes("stmpe wr: ", values, length);
119
120 ret = stmpe->ci->write_block(stmpe, reg, length, values);
121 if (ret < 0)
122 dev_err(stmpe->dev, "failed to write regs %#x: %d\n", reg, ret);
123
124 return ret;
125 }
126
127 /**
128 * stmpe_enable - enable blocks on an STMPE device
129 * @stmpe: Device to work on
130 * @blocks: Mask of blocks (enum stmpe_block values) to enable
131 */
132 int stmpe_enable(struct stmpe *stmpe, unsigned int blocks)
133 {
134 int ret;
135
136 mutex_lock(&stmpe->lock);
137 ret = __stmpe_enable(stmpe, blocks);
138 mutex_unlock(&stmpe->lock);
139
140 return ret;
141 }
142 EXPORT_SYMBOL_GPL(stmpe_enable);
143
144 /**
145 * stmpe_disable - disable blocks on an STMPE device
146 * @stmpe: Device to work on
147 * @blocks: Mask of blocks (enum stmpe_block values) to enable
148 */
149 int stmpe_disable(struct stmpe *stmpe, unsigned int blocks)
150 {
151 int ret;
152
153 mutex_lock(&stmpe->lock);
154 ret = __stmpe_disable(stmpe, blocks);
155 mutex_unlock(&stmpe->lock);
156
157 return ret;
158 }
159 EXPORT_SYMBOL_GPL(stmpe_disable);
160
161 /**
162 * stmpe_reg_read() - read a single STMPE register
163 * @stmpe: Device to read from
164 * @reg: Register to read
165 */
166 int stmpe_reg_read(struct stmpe *stmpe, u8 reg)
167 {
168 int ret;
169
170 mutex_lock(&stmpe->lock);
171 ret = __stmpe_reg_read(stmpe, reg);
172 mutex_unlock(&stmpe->lock);
173
174 return ret;
175 }
176 EXPORT_SYMBOL_GPL(stmpe_reg_read);
177
178 /**
179 * stmpe_reg_write() - write a single STMPE register
180 * @stmpe: Device to write to
181 * @reg: Register to write
182 * @val: Value to write
183 */
184 int stmpe_reg_write(struct stmpe *stmpe, u8 reg, u8 val)
185 {
186 int ret;
187
188 mutex_lock(&stmpe->lock);
189 ret = __stmpe_reg_write(stmpe, reg, val);
190 mutex_unlock(&stmpe->lock);
191
192 return ret;
193 }
194 EXPORT_SYMBOL_GPL(stmpe_reg_write);
195
196 /**
197 * stmpe_set_bits() - set the value of a bitfield in a STMPE register
198 * @stmpe: Device to write to
199 * @reg: Register to write
200 * @mask: Mask of bits to set
201 * @val: Value to set
202 */
203 int stmpe_set_bits(struct stmpe *stmpe, u8 reg, u8 mask, u8 val)
204 {
205 int ret;
206
207 mutex_lock(&stmpe->lock);
208 ret = __stmpe_set_bits(stmpe, reg, mask, val);
209 mutex_unlock(&stmpe->lock);
210
211 return ret;
212 }
213 EXPORT_SYMBOL_GPL(stmpe_set_bits);
214
215 /**
216 * stmpe_block_read() - read multiple STMPE registers
217 * @stmpe: Device to read from
218 * @reg: First register
219 * @length: Number of registers
220 * @values: Buffer to write to
221 */
222 int stmpe_block_read(struct stmpe *stmpe, u8 reg, u8 length, u8 *values)
223 {
224 int ret;
225
226 mutex_lock(&stmpe->lock);
227 ret = __stmpe_block_read(stmpe, reg, length, values);
228 mutex_unlock(&stmpe->lock);
229
230 return ret;
231 }
232 EXPORT_SYMBOL_GPL(stmpe_block_read);
233
234 /**
235 * stmpe_block_write() - write multiple STMPE registers
236 * @stmpe: Device to write to
237 * @reg: First register
238 * @length: Number of registers
239 * @values: Values to write
240 */
241 int stmpe_block_write(struct stmpe *stmpe, u8 reg, u8 length,
242 const u8 *values)
243 {
244 int ret;
245
246 mutex_lock(&stmpe->lock);
247 ret = __stmpe_block_write(stmpe, reg, length, values);
248 mutex_unlock(&stmpe->lock);
249
250 return ret;
251 }
252 EXPORT_SYMBOL_GPL(stmpe_block_write);
253
254 /**
255 * stmpe_set_altfunc()- set the alternate function for STMPE pins
256 * @stmpe: Device to configure
257 * @pins: Bitmask of pins to affect
258 * @block: block to enable alternate functions for
259 *
260 * @pins is assumed to have a bit set for each of the bits whose alternate
261 * function is to be changed, numbered according to the GPIOXY numbers.
262 *
263 * If the GPIO module is not enabled, this function automatically enables it in
264 * order to perform the change.
265 */
266 int stmpe_set_altfunc(struct stmpe *stmpe, u32 pins, enum stmpe_block block)
267 {
268 struct stmpe_variant_info *variant = stmpe->variant;
269 u8 regaddr = stmpe->regs[STMPE_IDX_GPAFR_U_MSB];
270 int af_bits = variant->af_bits;
271 int numregs = DIV_ROUND_UP(stmpe->num_gpios * af_bits, 8);
272 int mask = (1 << af_bits) - 1;
273 u8 regs[8];
274 int af, afperreg, ret;
275
276 if (!variant->get_altfunc)
277 return 0;
278
279 afperreg = 8 / af_bits;
280 mutex_lock(&stmpe->lock);
281
282 ret = __stmpe_enable(stmpe, STMPE_BLOCK_GPIO);
283 if (ret < 0)
284 goto out;
285
286 ret = __stmpe_block_read(stmpe, regaddr, numregs, regs);
287 if (ret < 0)
288 goto out;
289
290 af = variant->get_altfunc(stmpe, block);
291
292 while (pins) {
293 int pin = __ffs(pins);
294 int regoffset = numregs - (pin / afperreg) - 1;
295 int pos = (pin % afperreg) * (8 / afperreg);
296
297 regs[regoffset] &= ~(mask << pos);
298 regs[regoffset] |= af << pos;
299
300 pins &= ~(1 << pin);
301 }
302
303 ret = __stmpe_block_write(stmpe, regaddr, numregs, regs);
304
305 out:
306 mutex_unlock(&stmpe->lock);
307 return ret;
308 }
309 EXPORT_SYMBOL_GPL(stmpe_set_altfunc);
310
311 /*
312 * GPIO (all variants)
313 */
314
315 static struct resource stmpe_gpio_resources[] = {
316 /* Start and end filled dynamically */
317 {
318 .flags = IORESOURCE_IRQ,
319 },
320 };
321
322 static const struct mfd_cell stmpe_gpio_cell = {
323 .name = "stmpe-gpio",
324 .of_compatible = "st,stmpe-gpio",
325 .resources = stmpe_gpio_resources,
326 .num_resources = ARRAY_SIZE(stmpe_gpio_resources),
327 };
328
329 static const struct mfd_cell stmpe_gpio_cell_noirq = {
330 .name = "stmpe-gpio",
331 .of_compatible = "st,stmpe-gpio",
332 /* gpio cell resources consist of an irq only so no resources here */
333 };
334
335 /*
336 * Keypad (1601, 2401, 2403)
337 */
338
339 static struct resource stmpe_keypad_resources[] = {
340 {
341 .name = "KEYPAD",
342 .flags = IORESOURCE_IRQ,
343 },
344 {
345 .name = "KEYPAD_OVER",
346 .flags = IORESOURCE_IRQ,
347 },
348 };
349
350 static const struct mfd_cell stmpe_keypad_cell = {
351 .name = "stmpe-keypad",
352 .of_compatible = "st,stmpe-keypad",
353 .resources = stmpe_keypad_resources,
354 .num_resources = ARRAY_SIZE(stmpe_keypad_resources),
355 };
356
357 /*
358 * PWM (1601, 2401, 2403)
359 */
360 static struct resource stmpe_pwm_resources[] = {
361 {
362 .name = "PWM0",
363 .flags = IORESOURCE_IRQ,
364 },
365 {
366 .name = "PWM1",
367 .flags = IORESOURCE_IRQ,
368 },
369 {
370 .name = "PWM2",
371 .flags = IORESOURCE_IRQ,
372 },
373 };
374
375 static const struct mfd_cell stmpe_pwm_cell = {
376 .name = "stmpe-pwm",
377 .of_compatible = "st,stmpe-pwm",
378 .resources = stmpe_pwm_resources,
379 .num_resources = ARRAY_SIZE(stmpe_pwm_resources),
380 };
381
382 /*
383 * STMPE801
384 */
385 static const u8 stmpe801_regs[] = {
386 [STMPE_IDX_CHIP_ID] = STMPE801_REG_CHIP_ID,
387 [STMPE_IDX_ICR_LSB] = STMPE801_REG_SYS_CTRL,
388 [STMPE_IDX_GPMR_LSB] = STMPE801_REG_GPIO_MP_STA,
389 [STMPE_IDX_GPSR_LSB] = STMPE801_REG_GPIO_SET_PIN,
390 [STMPE_IDX_GPCR_LSB] = STMPE801_REG_GPIO_SET_PIN,
391 [STMPE_IDX_GPDR_LSB] = STMPE801_REG_GPIO_DIR,
392 [STMPE_IDX_IEGPIOR_LSB] = STMPE801_REG_GPIO_INT_EN,
393 [STMPE_IDX_ISGPIOR_MSB] = STMPE801_REG_GPIO_INT_STA,
394
395 };
396
397 static struct stmpe_variant_block stmpe801_blocks[] = {
398 {
399 .cell = &stmpe_gpio_cell,
400 .irq = 0,
401 .block = STMPE_BLOCK_GPIO,
402 },
403 };
404
405 static struct stmpe_variant_block stmpe801_blocks_noirq[] = {
406 {
407 .cell = &stmpe_gpio_cell_noirq,
408 .block = STMPE_BLOCK_GPIO,
409 },
410 };
411
412 static int stmpe801_enable(struct stmpe *stmpe, unsigned int blocks,
413 bool enable)
414 {
415 if (blocks & STMPE_BLOCK_GPIO)
416 return 0;
417 else
418 return -EINVAL;
419 }
420
421 static struct stmpe_variant_info stmpe801 = {
422 .name = "stmpe801",
423 .id_val = STMPE801_ID,
424 .id_mask = 0xffff,
425 .num_gpios = 8,
426 .regs = stmpe801_regs,
427 .blocks = stmpe801_blocks,
428 .num_blocks = ARRAY_SIZE(stmpe801_blocks),
429 .num_irqs = STMPE801_NR_INTERNAL_IRQS,
430 .enable = stmpe801_enable,
431 };
432
433 static struct stmpe_variant_info stmpe801_noirq = {
434 .name = "stmpe801",
435 .id_val = STMPE801_ID,
436 .id_mask = 0xffff,
437 .num_gpios = 8,
438 .regs = stmpe801_regs,
439 .blocks = stmpe801_blocks_noirq,
440 .num_blocks = ARRAY_SIZE(stmpe801_blocks_noirq),
441 .enable = stmpe801_enable,
442 };
443
444 /*
445 * Touchscreen (STMPE811 or STMPE610)
446 */
447
448 static struct resource stmpe_ts_resources[] = {
449 {
450 .name = "TOUCH_DET",
451 .flags = IORESOURCE_IRQ,
452 },
453 {
454 .name = "FIFO_TH",
455 .flags = IORESOURCE_IRQ,
456 },
457 };
458
459 static const struct mfd_cell stmpe_ts_cell = {
460 .name = "stmpe-ts",
461 .of_compatible = "st,stmpe-ts",
462 .resources = stmpe_ts_resources,
463 .num_resources = ARRAY_SIZE(stmpe_ts_resources),
464 };
465
466 /*
467 * STMPE811 or STMPE610
468 */
469
470 static const u8 stmpe811_regs[] = {
471 [STMPE_IDX_CHIP_ID] = STMPE811_REG_CHIP_ID,
472 [STMPE_IDX_ICR_LSB] = STMPE811_REG_INT_CTRL,
473 [STMPE_IDX_IER_LSB] = STMPE811_REG_INT_EN,
474 [STMPE_IDX_ISR_MSB] = STMPE811_REG_INT_STA,
475 [STMPE_IDX_GPMR_LSB] = STMPE811_REG_GPIO_MP_STA,
476 [STMPE_IDX_GPSR_LSB] = STMPE811_REG_GPIO_SET_PIN,
477 [STMPE_IDX_GPCR_LSB] = STMPE811_REG_GPIO_CLR_PIN,
478 [STMPE_IDX_GPDR_LSB] = STMPE811_REG_GPIO_DIR,
479 [STMPE_IDX_GPRER_LSB] = STMPE811_REG_GPIO_RE,
480 [STMPE_IDX_GPFER_LSB] = STMPE811_REG_GPIO_FE,
481 [STMPE_IDX_GPAFR_U_MSB] = STMPE811_REG_GPIO_AF,
482 [STMPE_IDX_IEGPIOR_LSB] = STMPE811_REG_GPIO_INT_EN,
483 [STMPE_IDX_ISGPIOR_MSB] = STMPE811_REG_GPIO_INT_STA,
484 [STMPE_IDX_GPEDR_MSB] = STMPE811_REG_GPIO_ED,
485 };
486
487 static struct stmpe_variant_block stmpe811_blocks[] = {
488 {
489 .cell = &stmpe_gpio_cell,
490 .irq = STMPE811_IRQ_GPIOC,
491 .block = STMPE_BLOCK_GPIO,
492 },
493 {
494 .cell = &stmpe_ts_cell,
495 .irq = STMPE811_IRQ_TOUCH_DET,
496 .block = STMPE_BLOCK_TOUCHSCREEN,
497 },
498 };
499
500 static int stmpe811_enable(struct stmpe *stmpe, unsigned int blocks,
501 bool enable)
502 {
503 unsigned int mask = 0;
504
505 if (blocks & STMPE_BLOCK_GPIO)
506 mask |= STMPE811_SYS_CTRL2_GPIO_OFF;
507
508 if (blocks & STMPE_BLOCK_ADC)
509 mask |= STMPE811_SYS_CTRL2_ADC_OFF;
510
511 if (blocks & STMPE_BLOCK_TOUCHSCREEN)
512 mask |= STMPE811_SYS_CTRL2_TSC_OFF;
513
514 return __stmpe_set_bits(stmpe, STMPE811_REG_SYS_CTRL2, mask,
515 enable ? 0 : mask);
516 }
517
518 static int stmpe811_get_altfunc(struct stmpe *stmpe, enum stmpe_block block)
519 {
520 /* 0 for touchscreen, 1 for GPIO */
521 return block != STMPE_BLOCK_TOUCHSCREEN;
522 }
523
524 static struct stmpe_variant_info stmpe811 = {
525 .name = "stmpe811",
526 .id_val = 0x0811,
527 .id_mask = 0xffff,
528 .num_gpios = 8,
529 .af_bits = 1,
530 .regs = stmpe811_regs,
531 .blocks = stmpe811_blocks,
532 .num_blocks = ARRAY_SIZE(stmpe811_blocks),
533 .num_irqs = STMPE811_NR_INTERNAL_IRQS,
534 .enable = stmpe811_enable,
535 .get_altfunc = stmpe811_get_altfunc,
536 };
537
538 /* Similar to 811, except number of gpios */
539 static struct stmpe_variant_info stmpe610 = {
540 .name = "stmpe610",
541 .id_val = 0x0811,
542 .id_mask = 0xffff,
543 .num_gpios = 6,
544 .af_bits = 1,
545 .regs = stmpe811_regs,
546 .blocks = stmpe811_blocks,
547 .num_blocks = ARRAY_SIZE(stmpe811_blocks),
548 .num_irqs = STMPE811_NR_INTERNAL_IRQS,
549 .enable = stmpe811_enable,
550 .get_altfunc = stmpe811_get_altfunc,
551 };
552
553 /*
554 * STMPE1601
555 */
556
557 static const u8 stmpe1601_regs[] = {
558 [STMPE_IDX_CHIP_ID] = STMPE1601_REG_CHIP_ID,
559 [STMPE_IDX_ICR_LSB] = STMPE1601_REG_ICR_LSB,
560 [STMPE_IDX_IER_LSB] = STMPE1601_REG_IER_LSB,
561 [STMPE_IDX_ISR_MSB] = STMPE1601_REG_ISR_MSB,
562 [STMPE_IDX_GPMR_LSB] = STMPE1601_REG_GPIO_MP_LSB,
563 [STMPE_IDX_GPSR_LSB] = STMPE1601_REG_GPIO_SET_LSB,
564 [STMPE_IDX_GPCR_LSB] = STMPE1601_REG_GPIO_CLR_LSB,
565 [STMPE_IDX_GPDR_LSB] = STMPE1601_REG_GPIO_SET_DIR_LSB,
566 [STMPE_IDX_GPRER_LSB] = STMPE1601_REG_GPIO_RE_LSB,
567 [STMPE_IDX_GPFER_LSB] = STMPE1601_REG_GPIO_FE_LSB,
568 [STMPE_IDX_GPPUR_LSB] = STMPE1601_REG_GPIO_PU_LSB,
569 [STMPE_IDX_GPAFR_U_MSB] = STMPE1601_REG_GPIO_AF_U_MSB,
570 [STMPE_IDX_IEGPIOR_LSB] = STMPE1601_REG_INT_EN_GPIO_MASK_LSB,
571 [STMPE_IDX_ISGPIOR_MSB] = STMPE1601_REG_INT_STA_GPIO_MSB,
572 [STMPE_IDX_GPEDR_MSB] = STMPE1601_REG_GPIO_ED_MSB,
573 };
574
575 static struct stmpe_variant_block stmpe1601_blocks[] = {
576 {
577 .cell = &stmpe_gpio_cell,
578 .irq = STMPE1601_IRQ_GPIOC,
579 .block = STMPE_BLOCK_GPIO,
580 },
581 {
582 .cell = &stmpe_keypad_cell,
583 .irq = STMPE1601_IRQ_KEYPAD,
584 .block = STMPE_BLOCK_KEYPAD,
585 },
586 {
587 .cell = &stmpe_pwm_cell,
588 .irq = STMPE1601_IRQ_PWM0,
589 .block = STMPE_BLOCK_PWM,
590 },
591 };
592
593 /* supported autosleep timeout delay (in msecs) */
594 static const int stmpe_autosleep_delay[] = {
595 4, 16, 32, 64, 128, 256, 512, 1024,
596 };
597
598 static int stmpe_round_timeout(int timeout)
599 {
600 int i;
601
602 for (i = 0; i < ARRAY_SIZE(stmpe_autosleep_delay); i++) {
603 if (stmpe_autosleep_delay[i] >= timeout)
604 return i;
605 }
606
607 /*
608 * requests for delays longer than supported should not return the
609 * longest supported delay
610 */
611 return -EINVAL;
612 }
613
614 static int stmpe_autosleep(struct stmpe *stmpe, int autosleep_timeout)
615 {
616 int ret;
617
618 if (!stmpe->variant->enable_autosleep)
619 return -ENOSYS;
620
621 mutex_lock(&stmpe->lock);
622 ret = stmpe->variant->enable_autosleep(stmpe, autosleep_timeout);
623 mutex_unlock(&stmpe->lock);
624
625 return ret;
626 }
627
628 /*
629 * Both stmpe 1601/2403 support same layout for autosleep
630 */
631 static int stmpe1601_autosleep(struct stmpe *stmpe,
632 int autosleep_timeout)
633 {
634 int ret, timeout;
635
636 /* choose the best available timeout */
637 timeout = stmpe_round_timeout(autosleep_timeout);
638 if (timeout < 0) {
639 dev_err(stmpe->dev, "invalid timeout\n");
640 return timeout;
641 }
642
643 ret = __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL2,
644 STMPE1601_AUTOSLEEP_TIMEOUT_MASK,
645 timeout);
646 if (ret < 0)
647 return ret;
648
649 return __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL2,
650 STPME1601_AUTOSLEEP_ENABLE,
651 STPME1601_AUTOSLEEP_ENABLE);
652 }
653
654 static int stmpe1601_enable(struct stmpe *stmpe, unsigned int blocks,
655 bool enable)
656 {
657 unsigned int mask = 0;
658
659 if (blocks & STMPE_BLOCK_GPIO)
660 mask |= STMPE1601_SYS_CTRL_ENABLE_GPIO;
661 else
662 mask &= ~STMPE1601_SYS_CTRL_ENABLE_GPIO;
663
664 if (blocks & STMPE_BLOCK_KEYPAD)
665 mask |= STMPE1601_SYS_CTRL_ENABLE_KPC;
666 else
667 mask &= ~STMPE1601_SYS_CTRL_ENABLE_KPC;
668
669 if (blocks & STMPE_BLOCK_PWM)
670 mask |= STMPE1601_SYS_CTRL_ENABLE_SPWM;
671 else
672 mask &= ~STMPE1601_SYS_CTRL_ENABLE_SPWM;
673
674 return __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL, mask,
675 enable ? mask : 0);
676 }
677
678 static int stmpe1601_get_altfunc(struct stmpe *stmpe, enum stmpe_block block)
679 {
680 switch (block) {
681 case STMPE_BLOCK_PWM:
682 return 2;
683
684 case STMPE_BLOCK_KEYPAD:
685 return 1;
686
687 case STMPE_BLOCK_GPIO:
688 default:
689 return 0;
690 }
691 }
692
693 static struct stmpe_variant_info stmpe1601 = {
694 .name = "stmpe1601",
695 .id_val = 0x0210,
696 .id_mask = 0xfff0, /* at least 0x0210 and 0x0212 */
697 .num_gpios = 16,
698 .af_bits = 2,
699 .regs = stmpe1601_regs,
700 .blocks = stmpe1601_blocks,
701 .num_blocks = ARRAY_SIZE(stmpe1601_blocks),
702 .num_irqs = STMPE1601_NR_INTERNAL_IRQS,
703 .enable = stmpe1601_enable,
704 .get_altfunc = stmpe1601_get_altfunc,
705 .enable_autosleep = stmpe1601_autosleep,
706 };
707
708 /*
709 * STMPE1801
710 */
711 static const u8 stmpe1801_regs[] = {
712 [STMPE_IDX_CHIP_ID] = STMPE1801_REG_CHIP_ID,
713 [STMPE_IDX_ICR_LSB] = STMPE1801_REG_INT_CTRL_LOW,
714 [STMPE_IDX_IER_LSB] = STMPE1801_REG_INT_EN_MASK_LOW,
715 [STMPE_IDX_ISR_LSB] = STMPE1801_REG_INT_STA_LOW,
716 [STMPE_IDX_GPMR_LSB] = STMPE1801_REG_GPIO_MP_LOW,
717 [STMPE_IDX_GPSR_LSB] = STMPE1801_REG_GPIO_SET_LOW,
718 [STMPE_IDX_GPCR_LSB] = STMPE1801_REG_GPIO_CLR_LOW,
719 [STMPE_IDX_GPDR_LSB] = STMPE1801_REG_GPIO_SET_DIR_LOW,
720 [STMPE_IDX_GPRER_LSB] = STMPE1801_REG_GPIO_RE_LOW,
721 [STMPE_IDX_GPFER_LSB] = STMPE1801_REG_GPIO_FE_LOW,
722 [STMPE_IDX_GPPUR_LSB] = STMPE1801_REG_GPIO_PULL_UP_LOW,
723 [STMPE_IDX_IEGPIOR_LSB] = STMPE1801_REG_INT_EN_GPIO_MASK_LOW,
724 [STMPE_IDX_ISGPIOR_LSB] = STMPE1801_REG_INT_STA_GPIO_LOW,
725 };
726
727 static struct stmpe_variant_block stmpe1801_blocks[] = {
728 {
729 .cell = &stmpe_gpio_cell,
730 .irq = STMPE1801_IRQ_GPIOC,
731 .block = STMPE_BLOCK_GPIO,
732 },
733 {
734 .cell = &stmpe_keypad_cell,
735 .irq = STMPE1801_IRQ_KEYPAD,
736 .block = STMPE_BLOCK_KEYPAD,
737 },
738 };
739
740 static int stmpe1801_enable(struct stmpe *stmpe, unsigned int blocks,
741 bool enable)
742 {
743 unsigned int mask = 0;
744 if (blocks & STMPE_BLOCK_GPIO)
745 mask |= STMPE1801_MSK_INT_EN_GPIO;
746
747 if (blocks & STMPE_BLOCK_KEYPAD)
748 mask |= STMPE1801_MSK_INT_EN_KPC;
749
750 return __stmpe_set_bits(stmpe, STMPE1801_REG_INT_EN_MASK_LOW, mask,
751 enable ? mask : 0);
752 }
753
754 static int stmpe1801_reset(struct stmpe *stmpe)
755 {
756 unsigned long timeout;
757 int ret = 0;
758
759 ret = __stmpe_set_bits(stmpe, STMPE1801_REG_SYS_CTRL,
760 STMPE1801_MSK_SYS_CTRL_RESET, STMPE1801_MSK_SYS_CTRL_RESET);
761 if (ret < 0)
762 return ret;
763
764 timeout = jiffies + msecs_to_jiffies(100);
765 while (time_before(jiffies, timeout)) {
766 ret = __stmpe_reg_read(stmpe, STMPE1801_REG_SYS_CTRL);
767 if (ret < 0)
768 return ret;
769 if (!(ret & STMPE1801_MSK_SYS_CTRL_RESET))
770 return 0;
771 usleep_range(100, 200);
772 }
773 return -EIO;
774 }
775
776 static struct stmpe_variant_info stmpe1801 = {
777 .name = "stmpe1801",
778 .id_val = STMPE1801_ID,
779 .id_mask = 0xfff0,
780 .num_gpios = 18,
781 .af_bits = 0,
782 .regs = stmpe1801_regs,
783 .blocks = stmpe1801_blocks,
784 .num_blocks = ARRAY_SIZE(stmpe1801_blocks),
785 .num_irqs = STMPE1801_NR_INTERNAL_IRQS,
786 .enable = stmpe1801_enable,
787 /* stmpe1801 do not have any gpio alternate function */
788 .get_altfunc = NULL,
789 };
790
791 /*
792 * STMPE24XX
793 */
794
795 static const u8 stmpe24xx_regs[] = {
796 [STMPE_IDX_CHIP_ID] = STMPE24XX_REG_CHIP_ID,
797 [STMPE_IDX_ICR_LSB] = STMPE24XX_REG_ICR_LSB,
798 [STMPE_IDX_IER_LSB] = STMPE24XX_REG_IER_LSB,
799 [STMPE_IDX_ISR_MSB] = STMPE24XX_REG_ISR_MSB,
800 [STMPE_IDX_GPMR_LSB] = STMPE24XX_REG_GPMR_LSB,
801 [STMPE_IDX_GPSR_LSB] = STMPE24XX_REG_GPSR_LSB,
802 [STMPE_IDX_GPCR_LSB] = STMPE24XX_REG_GPCR_LSB,
803 [STMPE_IDX_GPDR_LSB] = STMPE24XX_REG_GPDR_LSB,
804 [STMPE_IDX_GPRER_LSB] = STMPE24XX_REG_GPRER_LSB,
805 [STMPE_IDX_GPFER_LSB] = STMPE24XX_REG_GPFER_LSB,
806 [STMPE_IDX_GPPUR_LSB] = STMPE24XX_REG_GPPUR_LSB,
807 [STMPE_IDX_GPPDR_LSB] = STMPE24XX_REG_GPPDR_LSB,
808 [STMPE_IDX_GPAFR_U_MSB] = STMPE24XX_REG_GPAFR_U_MSB,
809 [STMPE_IDX_IEGPIOR_LSB] = STMPE24XX_REG_IEGPIOR_LSB,
810 [STMPE_IDX_ISGPIOR_MSB] = STMPE24XX_REG_ISGPIOR_MSB,
811 [STMPE_IDX_GPEDR_MSB] = STMPE24XX_REG_GPEDR_MSB,
812 };
813
814 static struct stmpe_variant_block stmpe24xx_blocks[] = {
815 {
816 .cell = &stmpe_gpio_cell,
817 .irq = STMPE24XX_IRQ_GPIOC,
818 .block = STMPE_BLOCK_GPIO,
819 },
820 {
821 .cell = &stmpe_keypad_cell,
822 .irq = STMPE24XX_IRQ_KEYPAD,
823 .block = STMPE_BLOCK_KEYPAD,
824 },
825 {
826 .cell = &stmpe_pwm_cell,
827 .irq = STMPE24XX_IRQ_PWM0,
828 .block = STMPE_BLOCK_PWM,
829 },
830 };
831
832 static int stmpe24xx_enable(struct stmpe *stmpe, unsigned int blocks,
833 bool enable)
834 {
835 unsigned int mask = 0;
836
837 if (blocks & STMPE_BLOCK_GPIO)
838 mask |= STMPE24XX_SYS_CTRL_ENABLE_GPIO;
839
840 if (blocks & STMPE_BLOCK_KEYPAD)
841 mask |= STMPE24XX_SYS_CTRL_ENABLE_KPC;
842
843 return __stmpe_set_bits(stmpe, STMPE24XX_REG_SYS_CTRL, mask,
844 enable ? mask : 0);
845 }
846
847 static int stmpe24xx_get_altfunc(struct stmpe *stmpe, enum stmpe_block block)
848 {
849 switch (block) {
850 case STMPE_BLOCK_ROTATOR:
851 return 2;
852
853 case STMPE_BLOCK_KEYPAD:
854 case STMPE_BLOCK_PWM:
855 return 1;
856
857 case STMPE_BLOCK_GPIO:
858 default:
859 return 0;
860 }
861 }
862
863 static struct stmpe_variant_info stmpe2401 = {
864 .name = "stmpe2401",
865 .id_val = 0x0101,
866 .id_mask = 0xffff,
867 .num_gpios = 24,
868 .af_bits = 2,
869 .regs = stmpe24xx_regs,
870 .blocks = stmpe24xx_blocks,
871 .num_blocks = ARRAY_SIZE(stmpe24xx_blocks),
872 .num_irqs = STMPE24XX_NR_INTERNAL_IRQS,
873 .enable = stmpe24xx_enable,
874 .get_altfunc = stmpe24xx_get_altfunc,
875 };
876
877 static struct stmpe_variant_info stmpe2403 = {
878 .name = "stmpe2403",
879 .id_val = 0x0120,
880 .id_mask = 0xffff,
881 .num_gpios = 24,
882 .af_bits = 2,
883 .regs = stmpe24xx_regs,
884 .blocks = stmpe24xx_blocks,
885 .num_blocks = ARRAY_SIZE(stmpe24xx_blocks),
886 .num_irqs = STMPE24XX_NR_INTERNAL_IRQS,
887 .enable = stmpe24xx_enable,
888 .get_altfunc = stmpe24xx_get_altfunc,
889 .enable_autosleep = stmpe1601_autosleep, /* same as stmpe1601 */
890 };
891
892 static struct stmpe_variant_info *stmpe_variant_info[STMPE_NBR_PARTS] = {
893 [STMPE610] = &stmpe610,
894 [STMPE801] = &stmpe801,
895 [STMPE811] = &stmpe811,
896 [STMPE1601] = &stmpe1601,
897 [STMPE1801] = &stmpe1801,
898 [STMPE2401] = &stmpe2401,
899 [STMPE2403] = &stmpe2403,
900 };
901
902 /*
903 * These devices can be connected in a 'no-irq' configuration - the irq pin
904 * is not used and the device cannot interrupt the CPU. Here we only list
905 * devices which support this configuration - the driver will fail probing
906 * for any devices not listed here which are configured in this way.
907 */
908 static struct stmpe_variant_info *stmpe_noirq_variant_info[STMPE_NBR_PARTS] = {
909 [STMPE801] = &stmpe801_noirq,
910 };
911
912 static irqreturn_t stmpe_irq(int irq, void *data)
913 {
914 struct stmpe *stmpe = data;
915 struct stmpe_variant_info *variant = stmpe->variant;
916 int num = DIV_ROUND_UP(variant->num_irqs, 8);
917 u8 israddr;
918 u8 isr[3];
919 int ret;
920 int i;
921
922 if (variant->id_val == STMPE801_ID) {
923 int base = irq_create_mapping(stmpe->domain, 0);
924
925 handle_nested_irq(base);
926 return IRQ_HANDLED;
927 }
928
929 if (variant->id_val == STMPE1801_ID)
930 israddr = stmpe->regs[STMPE_IDX_ISR_LSB];
931 else
932 israddr = stmpe->regs[STMPE_IDX_ISR_MSB];
933
934 ret = stmpe_block_read(stmpe, israddr, num, isr);
935 if (ret < 0)
936 return IRQ_NONE;
937
938 for (i = 0; i < num; i++) {
939 int bank = num - i - 1;
940 u8 status = isr[i];
941 u8 clear;
942
943 status &= stmpe->ier[bank];
944 if (!status)
945 continue;
946
947 clear = status;
948 while (status) {
949 int bit = __ffs(status);
950 int line = bank * 8 + bit;
951 int nestedirq = irq_create_mapping(stmpe->domain, line);
952
953 handle_nested_irq(nestedirq);
954 status &= ~(1 << bit);
955 }
956
957 stmpe_reg_write(stmpe, israddr + i, clear);
958 }
959
960 return IRQ_HANDLED;
961 }
962
963 static void stmpe_irq_lock(struct irq_data *data)
964 {
965 struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
966
967 mutex_lock(&stmpe->irq_lock);
968 }
969
970 static void stmpe_irq_sync_unlock(struct irq_data *data)
971 {
972 struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
973 struct stmpe_variant_info *variant = stmpe->variant;
974 int num = DIV_ROUND_UP(variant->num_irqs, 8);
975 int i;
976
977 for (i = 0; i < num; i++) {
978 u8 new = stmpe->ier[i];
979 u8 old = stmpe->oldier[i];
980
981 if (new == old)
982 continue;
983
984 stmpe->oldier[i] = new;
985 stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_IER_LSB] - i, new);
986 }
987
988 mutex_unlock(&stmpe->irq_lock);
989 }
990
991 static void stmpe_irq_mask(struct irq_data *data)
992 {
993 struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
994 int offset = data->hwirq;
995 int regoffset = offset / 8;
996 int mask = 1 << (offset % 8);
997
998 stmpe->ier[regoffset] &= ~mask;
999 }
1000
1001 static void stmpe_irq_unmask(struct irq_data *data)
1002 {
1003 struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
1004 int offset = data->hwirq;
1005 int regoffset = offset / 8;
1006 int mask = 1 << (offset % 8);
1007
1008 stmpe->ier[regoffset] |= mask;
1009 }
1010
1011 static struct irq_chip stmpe_irq_chip = {
1012 .name = "stmpe",
1013 .irq_bus_lock = stmpe_irq_lock,
1014 .irq_bus_sync_unlock = stmpe_irq_sync_unlock,
1015 .irq_mask = stmpe_irq_mask,
1016 .irq_unmask = stmpe_irq_unmask,
1017 };
1018
1019 static int stmpe_irq_map(struct irq_domain *d, unsigned int virq,
1020 irq_hw_number_t hwirq)
1021 {
1022 struct stmpe *stmpe = d->host_data;
1023 struct irq_chip *chip = NULL;
1024
1025 if (stmpe->variant->id_val != STMPE801_ID)
1026 chip = &stmpe_irq_chip;
1027
1028 irq_set_chip_data(virq, stmpe);
1029 irq_set_chip_and_handler(virq, chip, handle_edge_irq);
1030 irq_set_nested_thread(virq, 1);
1031 irq_set_noprobe(virq);
1032
1033 return 0;
1034 }
1035
1036 static void stmpe_irq_unmap(struct irq_domain *d, unsigned int virq)
1037 {
1038 irq_set_chip_and_handler(virq, NULL, NULL);
1039 irq_set_chip_data(virq, NULL);
1040 }
1041
1042 static const struct irq_domain_ops stmpe_irq_ops = {
1043 .map = stmpe_irq_map,
1044 .unmap = stmpe_irq_unmap,
1045 .xlate = irq_domain_xlate_twocell,
1046 };
1047
1048 static int stmpe_irq_init(struct stmpe *stmpe, struct device_node *np)
1049 {
1050 int base = 0;
1051 int num_irqs = stmpe->variant->num_irqs;
1052
1053 stmpe->domain = irq_domain_add_simple(np, num_irqs, base,
1054 &stmpe_irq_ops, stmpe);
1055 if (!stmpe->domain) {
1056 dev_err(stmpe->dev, "Failed to create irqdomain\n");
1057 return -ENOSYS;
1058 }
1059
1060 return 0;
1061 }
1062
1063 static int stmpe_chip_init(struct stmpe *stmpe)
1064 {
1065 unsigned int irq_trigger = stmpe->pdata->irq_trigger;
1066 int autosleep_timeout = stmpe->pdata->autosleep_timeout;
1067 struct stmpe_variant_info *variant = stmpe->variant;
1068 u8 icr = 0;
1069 unsigned int id;
1070 u8 data[2];
1071 int ret;
1072
1073 ret = stmpe_block_read(stmpe, stmpe->regs[STMPE_IDX_CHIP_ID],
1074 ARRAY_SIZE(data), data);
1075 if (ret < 0)
1076 return ret;
1077
1078 id = (data[0] << 8) | data[1];
1079 if ((id & variant->id_mask) != variant->id_val) {
1080 dev_err(stmpe->dev, "unknown chip id: %#x\n", id);
1081 return -EINVAL;
1082 }
1083
1084 dev_info(stmpe->dev, "%s detected, chip id: %#x\n", variant->name, id);
1085
1086 /* Disable all modules -- subdrivers should enable what they need. */
1087 ret = stmpe_disable(stmpe, ~0);
1088 if (ret)
1089 return ret;
1090
1091 if (id == STMPE1801_ID) {
1092 ret = stmpe1801_reset(stmpe);
1093 if (ret < 0)
1094 return ret;
1095 }
1096
1097 if (stmpe->irq >= 0) {
1098 if (id == STMPE801_ID)
1099 icr = STMPE801_REG_SYS_CTRL_INT_EN;
1100 else
1101 icr = STMPE_ICR_LSB_GIM;
1102
1103 /* STMPE801 doesn't support Edge interrupts */
1104 if (id != STMPE801_ID) {
1105 if (irq_trigger == IRQF_TRIGGER_FALLING ||
1106 irq_trigger == IRQF_TRIGGER_RISING)
1107 icr |= STMPE_ICR_LSB_EDGE;
1108 }
1109
1110 if (irq_trigger == IRQF_TRIGGER_RISING ||
1111 irq_trigger == IRQF_TRIGGER_HIGH) {
1112 if (id == STMPE801_ID)
1113 icr |= STMPE801_REG_SYS_CTRL_INT_HI;
1114 else
1115 icr |= STMPE_ICR_LSB_HIGH;
1116 }
1117 }
1118
1119 if (stmpe->pdata->autosleep) {
1120 ret = stmpe_autosleep(stmpe, autosleep_timeout);
1121 if (ret)
1122 return ret;
1123 }
1124
1125 return stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_ICR_LSB], icr);
1126 }
1127
1128 static int stmpe_add_device(struct stmpe *stmpe, const struct mfd_cell *cell)
1129 {
1130 return mfd_add_devices(stmpe->dev, stmpe->pdata->id, cell, 1,
1131 NULL, 0, stmpe->domain);
1132 }
1133
1134 static int stmpe_devices_init(struct stmpe *stmpe)
1135 {
1136 struct stmpe_variant_info *variant = stmpe->variant;
1137 unsigned int platform_blocks = stmpe->pdata->blocks;
1138 int ret = -EINVAL;
1139 int i, j;
1140
1141 for (i = 0; i < variant->num_blocks; i++) {
1142 struct stmpe_variant_block *block = &variant->blocks[i];
1143
1144 if (!(platform_blocks & block->block))
1145 continue;
1146
1147 for (j = 0; j < block->cell->num_resources; j++) {
1148 struct resource *res =
1149 (struct resource *) &block->cell->resources[j];
1150
1151 /* Dynamically fill in a variant's IRQ. */
1152 if (res->flags & IORESOURCE_IRQ)
1153 res->start = res->end = block->irq + j;
1154 }
1155
1156 platform_blocks &= ~block->block;
1157 ret = stmpe_add_device(stmpe, block->cell);
1158 if (ret)
1159 return ret;
1160 }
1161
1162 if (platform_blocks)
1163 dev_warn(stmpe->dev,
1164 "platform wants blocks (%#x) not present on variant",
1165 platform_blocks);
1166
1167 return ret;
1168 }
1169
1170 static void stmpe_of_probe(struct stmpe_platform_data *pdata,
1171 struct device_node *np)
1172 {
1173 struct device_node *child;
1174
1175 pdata->id = of_alias_get_id(np, "stmpe-i2c");
1176 if (pdata->id < 0)
1177 pdata->id = -1;
1178
1179 pdata->irq_gpio = of_get_named_gpio_flags(np, "irq-gpio", 0,
1180 &pdata->irq_trigger);
1181 if (gpio_is_valid(pdata->irq_gpio))
1182 pdata->irq_over_gpio = 1;
1183 else
1184 pdata->irq_trigger = IRQF_TRIGGER_NONE;
1185
1186 of_property_read_u32(np, "st,autosleep-timeout",
1187 &pdata->autosleep_timeout);
1188
1189 pdata->autosleep = (pdata->autosleep_timeout) ? true : false;
1190
1191 for_each_child_of_node(np, child) {
1192 if (!strcmp(child->name, "stmpe_gpio")) {
1193 pdata->blocks |= STMPE_BLOCK_GPIO;
1194 } else if (!strcmp(child->name, "stmpe_keypad")) {
1195 pdata->blocks |= STMPE_BLOCK_KEYPAD;
1196 } else if (!strcmp(child->name, "stmpe_touchscreen")) {
1197 pdata->blocks |= STMPE_BLOCK_TOUCHSCREEN;
1198 } else if (!strcmp(child->name, "stmpe_adc")) {
1199 pdata->blocks |= STMPE_BLOCK_ADC;
1200 } else if (!strcmp(child->name, "stmpe_pwm")) {
1201 pdata->blocks |= STMPE_BLOCK_PWM;
1202 } else if (!strcmp(child->name, "stmpe_rotator")) {
1203 pdata->blocks |= STMPE_BLOCK_ROTATOR;
1204 }
1205 }
1206 }
1207
1208 /* Called from client specific probe routines */
1209 int stmpe_probe(struct stmpe_client_info *ci, enum stmpe_partnum partnum)
1210 {
1211 struct stmpe_platform_data *pdata;
1212 struct device_node *np = ci->dev->of_node;
1213 struct stmpe *stmpe;
1214 int ret;
1215
1216 pdata = devm_kzalloc(ci->dev, sizeof(*pdata), GFP_KERNEL);
1217 if (!pdata)
1218 return -ENOMEM;
1219
1220 stmpe_of_probe(pdata, np);
1221
1222 if (of_find_property(np, "interrupts", NULL) == NULL)
1223 ci->irq = -1;
1224
1225 stmpe = devm_kzalloc(ci->dev, sizeof(struct stmpe), GFP_KERNEL);
1226 if (!stmpe)
1227 return -ENOMEM;
1228
1229 mutex_init(&stmpe->irq_lock);
1230 mutex_init(&stmpe->lock);
1231
1232 stmpe->dev = ci->dev;
1233 stmpe->client = ci->client;
1234 stmpe->pdata = pdata;
1235 stmpe->ci = ci;
1236 stmpe->partnum = partnum;
1237 stmpe->variant = stmpe_variant_info[partnum];
1238 stmpe->regs = stmpe->variant->regs;
1239 stmpe->num_gpios = stmpe->variant->num_gpios;
1240 stmpe->vcc = devm_regulator_get_optional(ci->dev, "vcc");
1241 if (!IS_ERR(stmpe->vcc)) {
1242 ret = regulator_enable(stmpe->vcc);
1243 if (ret)
1244 dev_warn(ci->dev, "failed to enable VCC supply\n");
1245 }
1246 stmpe->vio = devm_regulator_get_optional(ci->dev, "vio");
1247 if (!IS_ERR(stmpe->vio)) {
1248 ret = regulator_enable(stmpe->vio);
1249 if (ret)
1250 dev_warn(ci->dev, "failed to enable VIO supply\n");
1251 }
1252 dev_set_drvdata(stmpe->dev, stmpe);
1253
1254 if (ci->init)
1255 ci->init(stmpe);
1256
1257 if (pdata->irq_over_gpio) {
1258 ret = devm_gpio_request_one(ci->dev, pdata->irq_gpio,
1259 GPIOF_DIR_IN, "stmpe");
1260 if (ret) {
1261 dev_err(stmpe->dev, "failed to request IRQ GPIO: %d\n",
1262 ret);
1263 return ret;
1264 }
1265
1266 stmpe->irq = gpio_to_irq(pdata->irq_gpio);
1267 } else {
1268 stmpe->irq = ci->irq;
1269 }
1270
1271 if (stmpe->irq < 0) {
1272 /* use alternate variant info for no-irq mode, if supported */
1273 dev_info(stmpe->dev,
1274 "%s configured in no-irq mode by platform data\n",
1275 stmpe->variant->name);
1276 if (!stmpe_noirq_variant_info[stmpe->partnum]) {
1277 dev_err(stmpe->dev,
1278 "%s does not support no-irq mode!\n",
1279 stmpe->variant->name);
1280 return -ENODEV;
1281 }
1282 stmpe->variant = stmpe_noirq_variant_info[stmpe->partnum];
1283 } else if (pdata->irq_trigger == IRQF_TRIGGER_NONE) {
1284 pdata->irq_trigger = irq_get_trigger_type(stmpe->irq);
1285 }
1286
1287 ret = stmpe_chip_init(stmpe);
1288 if (ret)
1289 return ret;
1290
1291 if (stmpe->irq >= 0) {
1292 ret = stmpe_irq_init(stmpe, np);
1293 if (ret)
1294 return ret;
1295
1296 ret = devm_request_threaded_irq(ci->dev, stmpe->irq, NULL,
1297 stmpe_irq, pdata->irq_trigger | IRQF_ONESHOT,
1298 "stmpe", stmpe);
1299 if (ret) {
1300 dev_err(stmpe->dev, "failed to request IRQ: %d\n",
1301 ret);
1302 return ret;
1303 }
1304 }
1305
1306 ret = stmpe_devices_init(stmpe);
1307 if (!ret)
1308 return 0;
1309
1310 dev_err(stmpe->dev, "failed to add children\n");
1311 mfd_remove_devices(stmpe->dev);
1312
1313 return ret;
1314 }
1315
1316 int stmpe_remove(struct stmpe *stmpe)
1317 {
1318 if (!IS_ERR(stmpe->vio))
1319 regulator_disable(stmpe->vio);
1320 if (!IS_ERR(stmpe->vcc))
1321 regulator_disable(stmpe->vcc);
1322
1323 mfd_remove_devices(stmpe->dev);
1324
1325 return 0;
1326 }
1327
1328 #ifdef CONFIG_PM
1329 static int stmpe_suspend(struct device *dev)
1330 {
1331 struct stmpe *stmpe = dev_get_drvdata(dev);
1332
1333 if (stmpe->irq >= 0 && device_may_wakeup(dev))
1334 enable_irq_wake(stmpe->irq);
1335
1336 return 0;
1337 }
1338
1339 static int stmpe_resume(struct device *dev)
1340 {
1341 struct stmpe *stmpe = dev_get_drvdata(dev);
1342
1343 if (stmpe->irq >= 0 && device_may_wakeup(dev))
1344 disable_irq_wake(stmpe->irq);
1345
1346 return 0;
1347 }
1348
1349 const struct dev_pm_ops stmpe_dev_pm_ops = {
1350 .suspend = stmpe_suspend,
1351 .resume = stmpe_resume,
1352 };
1353 #endif
Linux kernel - Deliverables
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