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OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4
[zen-stable.git] / drivers / mfd / stmpe.c
blobe07947e56b2a0e2bd68d5aa7da434ae6aa5ed878
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/gpio.h>
11 #include <linux/export.h>
12 #include <linux/kernel.h>
13 #include <linux/interrupt.h>
14 #include <linux/irq.h>
15 #include <linux/pm.h>
16 #include <linux/slab.h>
17 #include <linux/mfd/core.h>
18 #include "stmpe.h"
19
20 static int __stmpe_enable(struct stmpe *stmpe, unsigned int blocks)
21 {
22 return stmpe->variant->enable(stmpe, blocks, true);
23 }
24
25 static int __stmpe_disable(struct stmpe *stmpe, unsigned int blocks)
26 {
27 return stmpe->variant->enable(stmpe, blocks, false);
28 }
29
30 static int __stmpe_reg_read(struct stmpe *stmpe, u8 reg)
31 {
32 int ret;
33
34 ret = stmpe->ci->read_byte(stmpe, reg);
35 if (ret < 0)
36 dev_err(stmpe->dev, "failed to read reg %#x: %d\n", reg, ret);
37
38 dev_vdbg(stmpe->dev, "rd: reg %#x => data %#x\n", reg, ret);
39
40 return ret;
41 }
42
43 static int __stmpe_reg_write(struct stmpe *stmpe, u8 reg, u8 val)
44 {
45 int ret;
46
47 dev_vdbg(stmpe->dev, "wr: reg %#x <= %#x\n", reg, val);
48
49 ret = stmpe->ci->write_byte(stmpe, reg, val);
50 if (ret < 0)
51 dev_err(stmpe->dev, "failed to write reg %#x: %d\n", reg, ret);
52
53 return ret;
54 }
55
56 static int __stmpe_set_bits(struct stmpe *stmpe, u8 reg, u8 mask, u8 val)
57 {
58 int ret;
59
60 ret = __stmpe_reg_read(stmpe, reg);
61 if (ret < 0)
62 return ret;
63
64 ret &= ~mask;
65 ret |= val;
66
67 return __stmpe_reg_write(stmpe, reg, ret);
68 }
69
70 static int __stmpe_block_read(struct stmpe *stmpe, u8 reg, u8 length,
71 u8 *values)
72 {
73 int ret;
74
75 ret = stmpe->ci->read_block(stmpe, reg, length, values);
76 if (ret < 0)
77 dev_err(stmpe->dev, "failed to read regs %#x: %d\n", reg, ret);
78
79 dev_vdbg(stmpe->dev, "rd: reg %#x (%d) => ret %#x\n", reg, length, ret);
80 stmpe_dump_bytes("stmpe rd: ", values, length);
81
82 return ret;
83 }
84
85 static int __stmpe_block_write(struct stmpe *stmpe, u8 reg, u8 length,
86 const u8 *values)
87 {
88 int ret;
89
90 dev_vdbg(stmpe->dev, "wr: regs %#x (%d)\n", reg, length);
91 stmpe_dump_bytes("stmpe wr: ", values, length);
92
93 ret = stmpe->ci->write_block(stmpe, reg, length, values);
94 if (ret < 0)
95 dev_err(stmpe->dev, "failed to write regs %#x: %d\n", reg, ret);
96
97 return ret;
98 }
99
100 /**
101 * stmpe_enable - enable blocks on an STMPE device
102 * @stmpe: Device to work on
103 * @blocks: Mask of blocks (enum stmpe_block values) to enable
104 */
105 int stmpe_enable(struct stmpe *stmpe, unsigned int blocks)
106 {
107 int ret;
108
109 mutex_lock(&stmpe->lock);
110 ret = __stmpe_enable(stmpe, blocks);
111 mutex_unlock(&stmpe->lock);
112
113 return ret;
114 }
115 EXPORT_SYMBOL_GPL(stmpe_enable);
116
117 /**
118 * stmpe_disable - disable blocks on an STMPE device
119 * @stmpe: Device to work on
120 * @blocks: Mask of blocks (enum stmpe_block values) to enable
121 */
122 int stmpe_disable(struct stmpe *stmpe, unsigned int blocks)
123 {
124 int ret;
125
126 mutex_lock(&stmpe->lock);
127 ret = __stmpe_disable(stmpe, blocks);
128 mutex_unlock(&stmpe->lock);
129
130 return ret;
131 }
132 EXPORT_SYMBOL_GPL(stmpe_disable);
133
134 /**
135 * stmpe_reg_read() - read a single STMPE register
136 * @stmpe: Device to read from
137 * @reg: Register to read
138 */
139 int stmpe_reg_read(struct stmpe *stmpe, u8 reg)
140 {
141 int ret;
142
143 mutex_lock(&stmpe->lock);
144 ret = __stmpe_reg_read(stmpe, reg);
145 mutex_unlock(&stmpe->lock);
146
147 return ret;
148 }
149 EXPORT_SYMBOL_GPL(stmpe_reg_read);
150
151 /**
152 * stmpe_reg_write() - write a single STMPE register
153 * @stmpe: Device to write to
154 * @reg: Register to write
155 * @val: Value to write
156 */
157 int stmpe_reg_write(struct stmpe *stmpe, u8 reg, u8 val)
158 {
159 int ret;
160
161 mutex_lock(&stmpe->lock);
162 ret = __stmpe_reg_write(stmpe, reg, val);
163 mutex_unlock(&stmpe->lock);
164
165 return ret;
166 }
167 EXPORT_SYMBOL_GPL(stmpe_reg_write);
168
169 /**
170 * stmpe_set_bits() - set the value of a bitfield in a STMPE register
171 * @stmpe: Device to write to
172 * @reg: Register to write
173 * @mask: Mask of bits to set
174 * @val: Value to set
175 */
176 int stmpe_set_bits(struct stmpe *stmpe, u8 reg, u8 mask, u8 val)
177 {
178 int ret;
179
180 mutex_lock(&stmpe->lock);
181 ret = __stmpe_set_bits(stmpe, reg, mask, val);
182 mutex_unlock(&stmpe->lock);
183
184 return ret;
185 }
186 EXPORT_SYMBOL_GPL(stmpe_set_bits);
187
188 /**
189 * stmpe_block_read() - read multiple STMPE registers
190 * @stmpe: Device to read from
191 * @reg: First register
192 * @length: Number of registers
193 * @values: Buffer to write to
194 */
195 int stmpe_block_read(struct stmpe *stmpe, u8 reg, u8 length, u8 *values)
196 {
197 int ret;
198
199 mutex_lock(&stmpe->lock);
200 ret = __stmpe_block_read(stmpe, reg, length, values);
201 mutex_unlock(&stmpe->lock);
202
203 return ret;
204 }
205 EXPORT_SYMBOL_GPL(stmpe_block_read);
206
207 /**
208 * stmpe_block_write() - write multiple STMPE registers
209 * @stmpe: Device to write to
210 * @reg: First register
211 * @length: Number of registers
212 * @values: Values to write
213 */
214 int stmpe_block_write(struct stmpe *stmpe, u8 reg, u8 length,
215 const u8 *values)
216 {
217 int ret;
218
219 mutex_lock(&stmpe->lock);
220 ret = __stmpe_block_write(stmpe, reg, length, values);
221 mutex_unlock(&stmpe->lock);
222
223 return ret;
224 }
225 EXPORT_SYMBOL_GPL(stmpe_block_write);
226
227 /**
228 * stmpe_set_altfunc()- set the alternate function for STMPE pins
229 * @stmpe: Device to configure
230 * @pins: Bitmask of pins to affect
231 * @block: block to enable alternate functions for
232 *
233 * @pins is assumed to have a bit set for each of the bits whose alternate
234 * function is to be changed, numbered according to the GPIOXY numbers.
235 *
236 * If the GPIO module is not enabled, this function automatically enables it in
237 * order to perform the change.
238 */
239 int stmpe_set_altfunc(struct stmpe *stmpe, u32 pins, enum stmpe_block block)
240 {
241 struct stmpe_variant_info *variant = stmpe->variant;
242 u8 regaddr = stmpe->regs[STMPE_IDX_GPAFR_U_MSB];
243 int af_bits = variant->af_bits;
244 int numregs = DIV_ROUND_UP(stmpe->num_gpios * af_bits, 8);
245 int mask = (1 << af_bits) - 1;
246 u8 regs[numregs];
247 int af, afperreg, ret;
248
249 if (!variant->get_altfunc)
250 return 0;
251
252 afperreg = 8 / af_bits;
253 mutex_lock(&stmpe->lock);
254
255 ret = __stmpe_enable(stmpe, STMPE_BLOCK_GPIO);
256 if (ret < 0)
257 goto out;
258
259 ret = __stmpe_block_read(stmpe, regaddr, numregs, regs);
260 if (ret < 0)
261 goto out;
262
263 af = variant->get_altfunc(stmpe, block);
264
265 while (pins) {
266 int pin = __ffs(pins);
267 int regoffset = numregs - (pin / afperreg) - 1;
268 int pos = (pin % afperreg) * (8 / afperreg);
269
270 regs[regoffset] &= ~(mask << pos);
271 regs[regoffset] |= af << pos;
272
273 pins &= ~(1 << pin);
274 }
275
276 ret = __stmpe_block_write(stmpe, regaddr, numregs, regs);
277
278 out:
279 mutex_unlock(&stmpe->lock);
280 return ret;
281 }
282 EXPORT_SYMBOL_GPL(stmpe_set_altfunc);
283
284 /*
285 * GPIO (all variants)
286 */
287
288 static struct resource stmpe_gpio_resources[] = {
289 /* Start and end filled dynamically */
290 {
291 .flags = IORESOURCE_IRQ,
292 },
293 };
294
295 static struct mfd_cell stmpe_gpio_cell = {
296 .name = "stmpe-gpio",
297 .resources = stmpe_gpio_resources,
298 .num_resources = ARRAY_SIZE(stmpe_gpio_resources),
299 };
300
301 /*
302 * Keypad (1601, 2401, 2403)
303 */
304
305 static struct resource stmpe_keypad_resources[] = {
306 {
307 .name = "KEYPAD",
308 .start = 0,
309 .end = 0,
310 .flags = IORESOURCE_IRQ,
311 },
312 {
313 .name = "KEYPAD_OVER",
314 .start = 1,
315 .end = 1,
316 .flags = IORESOURCE_IRQ,
317 },
318 };
319
320 static struct mfd_cell stmpe_keypad_cell = {
321 .name = "stmpe-keypad",
322 .resources = stmpe_keypad_resources,
323 .num_resources = ARRAY_SIZE(stmpe_keypad_resources),
324 };
325
326 /*
327 * STMPE801
328 */
329 static const u8 stmpe801_regs[] = {
330 [STMPE_IDX_CHIP_ID] = STMPE801_REG_CHIP_ID,
331 [STMPE_IDX_ICR_LSB] = STMPE801_REG_SYS_CTRL,
332 [STMPE_IDX_GPMR_LSB] = STMPE801_REG_GPIO_MP_STA,
333 [STMPE_IDX_GPSR_LSB] = STMPE801_REG_GPIO_SET_PIN,
334 [STMPE_IDX_GPCR_LSB] = STMPE801_REG_GPIO_SET_PIN,
335 [STMPE_IDX_GPDR_LSB] = STMPE801_REG_GPIO_DIR,
336 [STMPE_IDX_IEGPIOR_LSB] = STMPE801_REG_GPIO_INT_EN,
337 [STMPE_IDX_ISGPIOR_MSB] = STMPE801_REG_GPIO_INT_STA,
338
339 };
340
341 static struct stmpe_variant_block stmpe801_blocks[] = {
342 {
343 .cell = &stmpe_gpio_cell,
344 .irq = 0,
345 .block = STMPE_BLOCK_GPIO,
346 },
347 };
348
349 static int stmpe801_enable(struct stmpe *stmpe, unsigned int blocks,
350 bool enable)
351 {
352 if (blocks & STMPE_BLOCK_GPIO)
353 return 0;
354 else
355 return -EINVAL;
356 }
357
358 static struct stmpe_variant_info stmpe801 = {
359 .name = "stmpe801",
360 .id_val = STMPE801_ID,
361 .id_mask = 0xffff,
362 .num_gpios = 8,
363 .regs = stmpe801_regs,
364 .blocks = stmpe801_blocks,
365 .num_blocks = ARRAY_SIZE(stmpe801_blocks),
366 .num_irqs = STMPE801_NR_INTERNAL_IRQS,
367 .enable = stmpe801_enable,
368 };
369
370 /*
371 * Touchscreen (STMPE811 or STMPE610)
372 */
373
374 static struct resource stmpe_ts_resources[] = {
375 {
376 .name = "TOUCH_DET",
377 .start = 0,
378 .end = 0,
379 .flags = IORESOURCE_IRQ,
380 },
381 {
382 .name = "FIFO_TH",
383 .start = 1,
384 .end = 1,
385 .flags = IORESOURCE_IRQ,
386 },
387 };
388
389 static struct mfd_cell stmpe_ts_cell = {
390 .name = "stmpe-ts",
391 .resources = stmpe_ts_resources,
392 .num_resources = ARRAY_SIZE(stmpe_ts_resources),
393 };
394
395 /*
396 * STMPE811 or STMPE610
397 */
398
399 static const u8 stmpe811_regs[] = {
400 [STMPE_IDX_CHIP_ID] = STMPE811_REG_CHIP_ID,
401 [STMPE_IDX_ICR_LSB] = STMPE811_REG_INT_CTRL,
402 [STMPE_IDX_IER_LSB] = STMPE811_REG_INT_EN,
403 [STMPE_IDX_ISR_MSB] = STMPE811_REG_INT_STA,
404 [STMPE_IDX_GPMR_LSB] = STMPE811_REG_GPIO_MP_STA,
405 [STMPE_IDX_GPSR_LSB] = STMPE811_REG_GPIO_SET_PIN,
406 [STMPE_IDX_GPCR_LSB] = STMPE811_REG_GPIO_CLR_PIN,
407 [STMPE_IDX_GPDR_LSB] = STMPE811_REG_GPIO_DIR,
408 [STMPE_IDX_GPRER_LSB] = STMPE811_REG_GPIO_RE,
409 [STMPE_IDX_GPFER_LSB] = STMPE811_REG_GPIO_FE,
410 [STMPE_IDX_GPAFR_U_MSB] = STMPE811_REG_GPIO_AF,
411 [STMPE_IDX_IEGPIOR_LSB] = STMPE811_REG_GPIO_INT_EN,
412 [STMPE_IDX_ISGPIOR_MSB] = STMPE811_REG_GPIO_INT_STA,
413 [STMPE_IDX_GPEDR_MSB] = STMPE811_REG_GPIO_ED,
414 };
415
416 static struct stmpe_variant_block stmpe811_blocks[] = {
417 {
418 .cell = &stmpe_gpio_cell,
419 .irq = STMPE811_IRQ_GPIOC,
420 .block = STMPE_BLOCK_GPIO,
421 },
422 {
423 .cell = &stmpe_ts_cell,
424 .irq = STMPE811_IRQ_TOUCH_DET,
425 .block = STMPE_BLOCK_TOUCHSCREEN,
426 },
427 };
428
429 static int stmpe811_enable(struct stmpe *stmpe, unsigned int blocks,
430 bool enable)
431 {
432 unsigned int mask = 0;
433
434 if (blocks & STMPE_BLOCK_GPIO)
435 mask |= STMPE811_SYS_CTRL2_GPIO_OFF;
436
437 if (blocks & STMPE_BLOCK_ADC)
438 mask |= STMPE811_SYS_CTRL2_ADC_OFF;
439
440 if (blocks & STMPE_BLOCK_TOUCHSCREEN)
441 mask |= STMPE811_SYS_CTRL2_TSC_OFF;
442
443 return __stmpe_set_bits(stmpe, STMPE811_REG_SYS_CTRL2, mask,
444 enable ? 0 : mask);
445 }
446
447 static int stmpe811_get_altfunc(struct stmpe *stmpe, enum stmpe_block block)
448 {
449 /* 0 for touchscreen, 1 for GPIO */
450 return block != STMPE_BLOCK_TOUCHSCREEN;
451 }
452
453 static struct stmpe_variant_info stmpe811 = {
454 .name = "stmpe811",
455 .id_val = 0x0811,
456 .id_mask = 0xffff,
457 .num_gpios = 8,
458 .af_bits = 1,
459 .regs = stmpe811_regs,
460 .blocks = stmpe811_blocks,
461 .num_blocks = ARRAY_SIZE(stmpe811_blocks),
462 .num_irqs = STMPE811_NR_INTERNAL_IRQS,
463 .enable = stmpe811_enable,
464 .get_altfunc = stmpe811_get_altfunc,
465 };
466
467 /* Similar to 811, except number of gpios */
468 static struct stmpe_variant_info stmpe610 = {
469 .name = "stmpe610",
470 .id_val = 0x0811,
471 .id_mask = 0xffff,
472 .num_gpios = 6,
473 .af_bits = 1,
474 .regs = stmpe811_regs,
475 .blocks = stmpe811_blocks,
476 .num_blocks = ARRAY_SIZE(stmpe811_blocks),
477 .num_irqs = STMPE811_NR_INTERNAL_IRQS,
478 .enable = stmpe811_enable,
479 .get_altfunc = stmpe811_get_altfunc,
480 };
481
482 /*
483 * STMPE1601
484 */
485
486 static const u8 stmpe1601_regs[] = {
487 [STMPE_IDX_CHIP_ID] = STMPE1601_REG_CHIP_ID,
488 [STMPE_IDX_ICR_LSB] = STMPE1601_REG_ICR_LSB,
489 [STMPE_IDX_IER_LSB] = STMPE1601_REG_IER_LSB,
490 [STMPE_IDX_ISR_MSB] = STMPE1601_REG_ISR_MSB,
491 [STMPE_IDX_GPMR_LSB] = STMPE1601_REG_GPIO_MP_LSB,
492 [STMPE_IDX_GPSR_LSB] = STMPE1601_REG_GPIO_SET_LSB,
493 [STMPE_IDX_GPCR_LSB] = STMPE1601_REG_GPIO_CLR_LSB,
494 [STMPE_IDX_GPDR_LSB] = STMPE1601_REG_GPIO_SET_DIR_LSB,
495 [STMPE_IDX_GPRER_LSB] = STMPE1601_REG_GPIO_RE_LSB,
496 [STMPE_IDX_GPFER_LSB] = STMPE1601_REG_GPIO_FE_LSB,
497 [STMPE_IDX_GPAFR_U_MSB] = STMPE1601_REG_GPIO_AF_U_MSB,
498 [STMPE_IDX_IEGPIOR_LSB] = STMPE1601_REG_INT_EN_GPIO_MASK_LSB,
499 [STMPE_IDX_ISGPIOR_MSB] = STMPE1601_REG_INT_STA_GPIO_MSB,
500 [STMPE_IDX_GPEDR_MSB] = STMPE1601_REG_GPIO_ED_MSB,
501 };
502
503 static struct stmpe_variant_block stmpe1601_blocks[] = {
504 {
505 .cell = &stmpe_gpio_cell,
506 .irq = STMPE24XX_IRQ_GPIOC,
507 .block = STMPE_BLOCK_GPIO,
508 },
509 {
510 .cell = &stmpe_keypad_cell,
511 .irq = STMPE24XX_IRQ_KEYPAD,
512 .block = STMPE_BLOCK_KEYPAD,
513 },
514 };
515
516 /* supported autosleep timeout delay (in msecs) */
517 static const int stmpe_autosleep_delay[] = {
518 4, 16, 32, 64, 128, 256, 512, 1024,
519 };
520
521 static int stmpe_round_timeout(int timeout)
522 {
523 int i;
524
525 for (i = 0; i < ARRAY_SIZE(stmpe_autosleep_delay); i++) {
526 if (stmpe_autosleep_delay[i] >= timeout)
527 return i;
528 }
529
530 /*
531 * requests for delays longer than supported should not return the
532 * longest supported delay
533 */
534 return -EINVAL;
535 }
536
537 static int stmpe_autosleep(struct stmpe *stmpe, int autosleep_timeout)
538 {
539 int ret;
540
541 if (!stmpe->variant->enable_autosleep)
542 return -ENOSYS;
543
544 mutex_lock(&stmpe->lock);
545 ret = stmpe->variant->enable_autosleep(stmpe, autosleep_timeout);
546 mutex_unlock(&stmpe->lock);
547
548 return ret;
549 }
550
551 /*
552 * Both stmpe 1601/2403 support same layout for autosleep
553 */
554 static int stmpe1601_autosleep(struct stmpe *stmpe,
555 int autosleep_timeout)
556 {
557 int ret, timeout;
558
559 /* choose the best available timeout */
560 timeout = stmpe_round_timeout(autosleep_timeout);
561 if (timeout < 0) {
562 dev_err(stmpe->dev, "invalid timeout\n");
563 return timeout;
564 }
565
566 ret = __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL2,
567 STMPE1601_AUTOSLEEP_TIMEOUT_MASK,
568 timeout);
569 if (ret < 0)
570 return ret;
571
572 return __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL2,
573 STPME1601_AUTOSLEEP_ENABLE,
574 STPME1601_AUTOSLEEP_ENABLE);
575 }
576
577 static int stmpe1601_enable(struct stmpe *stmpe, unsigned int blocks,
578 bool enable)
579 {
580 unsigned int mask = 0;
581
582 if (blocks & STMPE_BLOCK_GPIO)
583 mask |= STMPE1601_SYS_CTRL_ENABLE_GPIO;
584
585 if (blocks & STMPE_BLOCK_KEYPAD)
586 mask |= STMPE1601_SYS_CTRL_ENABLE_KPC;
587
588 return __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL, mask,
589 enable ? mask : 0);
590 }
591
592 static int stmpe1601_get_altfunc(struct stmpe *stmpe, enum stmpe_block block)
593 {
594 switch (block) {
595 case STMPE_BLOCK_PWM:
596 return 2;
597
598 case STMPE_BLOCK_KEYPAD:
599 return 1;
600
601 case STMPE_BLOCK_GPIO:
602 default:
603 return 0;
604 }
605 }
606
607 static struct stmpe_variant_info stmpe1601 = {
608 .name = "stmpe1601",
609 .id_val = 0x0210,
610 .id_mask = 0xfff0, /* at least 0x0210 and 0x0212 */
611 .num_gpios = 16,
612 .af_bits = 2,
613 .regs = stmpe1601_regs,
614 .blocks = stmpe1601_blocks,
615 .num_blocks = ARRAY_SIZE(stmpe1601_blocks),
616 .num_irqs = STMPE1601_NR_INTERNAL_IRQS,
617 .enable = stmpe1601_enable,
618 .get_altfunc = stmpe1601_get_altfunc,
619 .enable_autosleep = stmpe1601_autosleep,
620 };
621
622 /*
623 * STMPE24XX
624 */
625
626 static const u8 stmpe24xx_regs[] = {
627 [STMPE_IDX_CHIP_ID] = STMPE24XX_REG_CHIP_ID,
628 [STMPE_IDX_ICR_LSB] = STMPE24XX_REG_ICR_LSB,
629 [STMPE_IDX_IER_LSB] = STMPE24XX_REG_IER_LSB,
630 [STMPE_IDX_ISR_MSB] = STMPE24XX_REG_ISR_MSB,
631 [STMPE_IDX_GPMR_LSB] = STMPE24XX_REG_GPMR_LSB,
632 [STMPE_IDX_GPSR_LSB] = STMPE24XX_REG_GPSR_LSB,
633 [STMPE_IDX_GPCR_LSB] = STMPE24XX_REG_GPCR_LSB,
634 [STMPE_IDX_GPDR_LSB] = STMPE24XX_REG_GPDR_LSB,
635 [STMPE_IDX_GPRER_LSB] = STMPE24XX_REG_GPRER_LSB,
636 [STMPE_IDX_GPFER_LSB] = STMPE24XX_REG_GPFER_LSB,
637 [STMPE_IDX_GPAFR_U_MSB] = STMPE24XX_REG_GPAFR_U_MSB,
638 [STMPE_IDX_IEGPIOR_LSB] = STMPE24XX_REG_IEGPIOR_LSB,
639 [STMPE_IDX_ISGPIOR_MSB] = STMPE24XX_REG_ISGPIOR_MSB,
640 [STMPE_IDX_GPEDR_MSB] = STMPE24XX_REG_GPEDR_MSB,
641 };
642
643 static struct stmpe_variant_block stmpe24xx_blocks[] = {
644 {
645 .cell = &stmpe_gpio_cell,
646 .irq = STMPE24XX_IRQ_GPIOC,
647 .block = STMPE_BLOCK_GPIO,
648 },
649 {
650 .cell = &stmpe_keypad_cell,
651 .irq = STMPE24XX_IRQ_KEYPAD,
652 .block = STMPE_BLOCK_KEYPAD,
653 },
654 };
655
656 static int stmpe24xx_enable(struct stmpe *stmpe, unsigned int blocks,
657 bool enable)
658 {
659 unsigned int mask = 0;
660
661 if (blocks & STMPE_BLOCK_GPIO)
662 mask |= STMPE24XX_SYS_CTRL_ENABLE_GPIO;
663
664 if (blocks & STMPE_BLOCK_KEYPAD)
665 mask |= STMPE24XX_SYS_CTRL_ENABLE_KPC;
666
667 return __stmpe_set_bits(stmpe, STMPE24XX_REG_SYS_CTRL, mask,
668 enable ? mask : 0);
669 }
670
671 static int stmpe24xx_get_altfunc(struct stmpe *stmpe, enum stmpe_block block)
672 {
673 switch (block) {
674 case STMPE_BLOCK_ROTATOR:
675 return 2;
676
677 case STMPE_BLOCK_KEYPAD:
678 return 1;
679
680 case STMPE_BLOCK_GPIO:
681 default:
682 return 0;
683 }
684 }
685
686 static struct stmpe_variant_info stmpe2401 = {
687 .name = "stmpe2401",
688 .id_val = 0x0101,
689 .id_mask = 0xffff,
690 .num_gpios = 24,
691 .af_bits = 2,
692 .regs = stmpe24xx_regs,
693 .blocks = stmpe24xx_blocks,
694 .num_blocks = ARRAY_SIZE(stmpe24xx_blocks),
695 .num_irqs = STMPE24XX_NR_INTERNAL_IRQS,
696 .enable = stmpe24xx_enable,
697 .get_altfunc = stmpe24xx_get_altfunc,
698 };
699
700 static struct stmpe_variant_info stmpe2403 = {
701 .name = "stmpe2403",
702 .id_val = 0x0120,
703 .id_mask = 0xffff,
704 .num_gpios = 24,
705 .af_bits = 2,
706 .regs = stmpe24xx_regs,
707 .blocks = stmpe24xx_blocks,
708 .num_blocks = ARRAY_SIZE(stmpe24xx_blocks),
709 .num_irqs = STMPE24XX_NR_INTERNAL_IRQS,
710 .enable = stmpe24xx_enable,
711 .get_altfunc = stmpe24xx_get_altfunc,
712 .enable_autosleep = stmpe1601_autosleep, /* same as stmpe1601 */
713 };
714
715 static struct stmpe_variant_info *stmpe_variant_info[] = {
716 [STMPE610] = &stmpe610,
717 [STMPE801] = &stmpe801,
718 [STMPE811] = &stmpe811,
719 [STMPE1601] = &stmpe1601,
720 [STMPE2401] = &stmpe2401,
721 [STMPE2403] = &stmpe2403,
722 };
723
724 static irqreturn_t stmpe_irq(int irq, void *data)
725 {
726 struct stmpe *stmpe = data;
727 struct stmpe_variant_info *variant = stmpe->variant;
728 int num = DIV_ROUND_UP(variant->num_irqs, 8);
729 u8 israddr = stmpe->regs[STMPE_IDX_ISR_MSB];
730 u8 isr[num];
731 int ret;
732 int i;
733
734 if (variant->id_val == STMPE801_ID) {
735 handle_nested_irq(stmpe->irq_base);
736 return IRQ_HANDLED;
737 }
738
739 ret = stmpe_block_read(stmpe, israddr, num, isr);
740 if (ret < 0)
741 return IRQ_NONE;
742
743 for (i = 0; i < num; i++) {
744 int bank = num - i - 1;
745 u8 status = isr[i];
746 u8 clear;
747
748 status &= stmpe->ier[bank];
749 if (!status)
750 continue;
751
752 clear = status;
753 while (status) {
754 int bit = __ffs(status);
755 int line = bank * 8 + bit;
756
757 handle_nested_irq(stmpe->irq_base + line);
758 status &= ~(1 << bit);
759 }
760
761 stmpe_reg_write(stmpe, israddr + i, clear);
762 }
763
764 return IRQ_HANDLED;
765 }
766
767 static void stmpe_irq_lock(struct irq_data *data)
768 {
769 struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
770
771 mutex_lock(&stmpe->irq_lock);
772 }
773
774 static void stmpe_irq_sync_unlock(struct irq_data *data)
775 {
776 struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
777 struct stmpe_variant_info *variant = stmpe->variant;
778 int num = DIV_ROUND_UP(variant->num_irqs, 8);
779 int i;
780
781 for (i = 0; i < num; i++) {
782 u8 new = stmpe->ier[i];
783 u8 old = stmpe->oldier[i];
784
785 if (new == old)
786 continue;
787
788 stmpe->oldier[i] = new;
789 stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_IER_LSB] - i, new);
790 }
791
792 mutex_unlock(&stmpe->irq_lock);
793 }
794
795 static void stmpe_irq_mask(struct irq_data *data)
796 {
797 struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
798 int offset = data->irq - stmpe->irq_base;
799 int regoffset = offset / 8;
800 int mask = 1 << (offset % 8);
801
802 stmpe->ier[regoffset] &= ~mask;
803 }
804
805 static void stmpe_irq_unmask(struct irq_data *data)
806 {
807 struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
808 int offset = data->irq - stmpe->irq_base;
809 int regoffset = offset / 8;
810 int mask = 1 << (offset % 8);
811
812 stmpe->ier[regoffset] |= mask;
813 }
814
815 static struct irq_chip stmpe_irq_chip = {
816 .name = "stmpe",
817 .irq_bus_lock = stmpe_irq_lock,
818 .irq_bus_sync_unlock = stmpe_irq_sync_unlock,
819 .irq_mask = stmpe_irq_mask,
820 .irq_unmask = stmpe_irq_unmask,
821 };
822
823 static int __devinit stmpe_irq_init(struct stmpe *stmpe)
824 {
825 struct irq_chip *chip = NULL;
826 int num_irqs = stmpe->variant->num_irqs;
827 int base = stmpe->irq_base;
828 int irq;
829
830 if (stmpe->variant->id_val != STMPE801_ID)
831 chip = &stmpe_irq_chip;
832
833 for (irq = base; irq < base + num_irqs; irq++) {
834 irq_set_chip_data(irq, stmpe);
835 irq_set_chip_and_handler(irq, chip, handle_edge_irq);
836 irq_set_nested_thread(irq, 1);
837 #ifdef CONFIG_ARM
838 set_irq_flags(irq, IRQF_VALID);
839 #else
840 irq_set_noprobe(irq);
841 #endif
842 }
843
844 return 0;
845 }
846
847 static void stmpe_irq_remove(struct stmpe *stmpe)
848 {
849 int num_irqs = stmpe->variant->num_irqs;
850 int base = stmpe->irq_base;
851 int irq;
852
853 for (irq = base; irq < base + num_irqs; irq++) {
854 #ifdef CONFIG_ARM
855 set_irq_flags(irq, 0);
856 #endif
857 irq_set_chip_and_handler(irq, NULL, NULL);
858 irq_set_chip_data(irq, NULL);
859 }
860 }
861
862 static int __devinit stmpe_chip_init(struct stmpe *stmpe)
863 {
864 unsigned int irq_trigger = stmpe->pdata->irq_trigger;
865 int autosleep_timeout = stmpe->pdata->autosleep_timeout;
866 struct stmpe_variant_info *variant = stmpe->variant;
867 u8 icr;
868 unsigned int id;
869 u8 data[2];
870 int ret;
871
872 ret = stmpe_block_read(stmpe, stmpe->regs[STMPE_IDX_CHIP_ID],
873 ARRAY_SIZE(data), data);
874 if (ret < 0)
875 return ret;
876
877 id = (data[0] << 8) | data[1];
878 if ((id & variant->id_mask) != variant->id_val) {
879 dev_err(stmpe->dev, "unknown chip id: %#x\n", id);
880 return -EINVAL;
881 }
882
883 dev_info(stmpe->dev, "%s detected, chip id: %#x\n", variant->name, id);
884
885 /* Disable all modules -- subdrivers should enable what they need. */
886 ret = stmpe_disable(stmpe, ~0);
887 if (ret)
888 return ret;
889
890 if (id == STMPE801_ID)
891 icr = STMPE801_REG_SYS_CTRL_INT_EN;
892 else
893 icr = STMPE_ICR_LSB_GIM;
894
895 /* STMPE801 doesn't support Edge interrupts */
896 if (id != STMPE801_ID) {
897 if (irq_trigger == IRQF_TRIGGER_FALLING ||
898 irq_trigger == IRQF_TRIGGER_RISING)
899 icr |= STMPE_ICR_LSB_EDGE;
900 }
901
902 if (irq_trigger == IRQF_TRIGGER_RISING ||
903 irq_trigger == IRQF_TRIGGER_HIGH) {
904 if (id == STMPE801_ID)
905 icr |= STMPE801_REG_SYS_CTRL_INT_HI;
906 else
907 icr |= STMPE_ICR_LSB_HIGH;
908 }
909
910 if (stmpe->pdata->irq_invert_polarity) {
911 if (id == STMPE801_ID)
912 icr ^= STMPE801_REG_SYS_CTRL_INT_HI;
913 else
914 icr ^= STMPE_ICR_LSB_HIGH;
915 }
916
917 if (stmpe->pdata->autosleep) {
918 ret = stmpe_autosleep(stmpe, autosleep_timeout);
919 if (ret)
920 return ret;
921 }
922
923 return stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_ICR_LSB], icr);
924 }
925
926 static int __devinit stmpe_add_device(struct stmpe *stmpe,
927 struct mfd_cell *cell, int irq)
928 {
929 return mfd_add_devices(stmpe->dev, stmpe->pdata->id, cell, 1,
930 NULL, stmpe->irq_base + irq);
931 }
932
933 static int __devinit stmpe_devices_init(struct stmpe *stmpe)
934 {
935 struct stmpe_variant_info *variant = stmpe->variant;
936 unsigned int platform_blocks = stmpe->pdata->blocks;
937 int ret = -EINVAL;
938 int i;
939
940 for (i = 0; i < variant->num_blocks; i++) {
941 struct stmpe_variant_block *block = &variant->blocks[i];
942
943 if (!(platform_blocks & block->block))
944 continue;
945
946 platform_blocks &= ~block->block;
947 ret = stmpe_add_device(stmpe, block->cell, block->irq);
948 if (ret)
949 return ret;
950 }
951
952 if (platform_blocks)
953 dev_warn(stmpe->dev,
954 "platform wants blocks (%#x) not present on variant",
955 platform_blocks);
956
957 return ret;
958 }
959
960 /* Called from client specific probe routines */
961 int __devinit stmpe_probe(struct stmpe_client_info *ci, int partnum)
962 {
963 struct stmpe_platform_data *pdata = dev_get_platdata(ci->dev);
964 struct stmpe *stmpe;
965 int ret;
966
967 if (!pdata)
968 return -EINVAL;
969
970 stmpe = kzalloc(sizeof(struct stmpe), GFP_KERNEL);
971 if (!stmpe)
972 return -ENOMEM;
973
974 mutex_init(&stmpe->irq_lock);
975 mutex_init(&stmpe->lock);
976
977 stmpe->dev = ci->dev;
978 stmpe->client = ci->client;
979 stmpe->pdata = pdata;
980 stmpe->irq_base = pdata->irq_base;
981 stmpe->ci = ci;
982 stmpe->partnum = partnum;
983 stmpe->variant = stmpe_variant_info[partnum];
984 stmpe->regs = stmpe->variant->regs;
985 stmpe->num_gpios = stmpe->variant->num_gpios;
986 dev_set_drvdata(stmpe->dev, stmpe);
987
988 if (ci->init)
989 ci->init(stmpe);
990
991 if (pdata->irq_over_gpio) {
992 ret = gpio_request_one(pdata->irq_gpio, GPIOF_DIR_IN, "stmpe");
993 if (ret) {
994 dev_err(stmpe->dev, "failed to request IRQ GPIO: %d\n",
995 ret);
996 goto out_free;
997 }
998
999 stmpe->irq = gpio_to_irq(pdata->irq_gpio);
1000 } else {
1001 stmpe->irq = ci->irq;
1002 }
1003
1004 ret = stmpe_chip_init(stmpe);
1005 if (ret)
1006 goto free_gpio;
1007
1008 ret = stmpe_irq_init(stmpe);
1009 if (ret)
1010 goto free_gpio;
1011
1012 ret = request_threaded_irq(stmpe->irq, NULL, stmpe_irq,
1013 pdata->irq_trigger | IRQF_ONESHOT, "stmpe", stmpe);
1014 if (ret) {
1015 dev_err(stmpe->dev, "failed to request IRQ: %d\n", ret);
1016 goto out_removeirq;
1017 }
1018
1019 ret = stmpe_devices_init(stmpe);
1020 if (ret) {
1021 dev_err(stmpe->dev, "failed to add children\n");
1022 goto out_removedevs;
1023 }
1024
1025 return 0;
1026
1027 out_removedevs:
1028 mfd_remove_devices(stmpe->dev);
1029 free_irq(stmpe->irq, stmpe);
1030 out_removeirq:
1031 stmpe_irq_remove(stmpe);
1032 free_gpio:
1033 if (pdata->irq_over_gpio)
1034 gpio_free(pdata->irq_gpio);
1035 out_free:
1036 kfree(stmpe);
1037 return ret;
1038 }
1039
1040 int stmpe_remove(struct stmpe *stmpe)
1041 {
1042 mfd_remove_devices(stmpe->dev);
1043
1044 free_irq(stmpe->irq, stmpe);
1045 stmpe_irq_remove(stmpe);
1046
1047 if (stmpe->pdata->irq_over_gpio)
1048 gpio_free(stmpe->pdata->irq_gpio);
1049
1050 kfree(stmpe);
1051
1052 return 0;
1053 }
1054
1055 #ifdef CONFIG_PM
1056 static int stmpe_suspend(struct device *dev)
1057 {
1058 struct stmpe *stmpe = dev_get_drvdata(dev);
1059
1060 if (device_may_wakeup(dev))
1061 enable_irq_wake(stmpe->irq);
1062
1063 return 0;
1064 }
1065
1066 static int stmpe_resume(struct device *dev)
1067 {
1068 struct stmpe *stmpe = dev_get_drvdata(dev);
1069
1070 if (device_may_wakeup(dev))
1071 disable_irq_wake(stmpe->irq);
1072
1073 return 0;
1074 }
1075
1076 const struct dev_pm_ops stmpe_dev_pm_ops = {
1077 .suspend = stmpe_suspend,
1078 .resume = stmpe_resume,
1079 };
1080 #endif