Loading...
1/*
2 * Copyright (C) ST-Ericsson SA 2010
3 *
4 * License Terms: GNU General Public License, version 2
5 * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
6 */
7
8#include <linux/kernel.h>
9#include <linux/module.h>
10#include <linux/interrupt.h>
11#include <linux/irq.h>
12#include <linux/slab.h>
13#include <linux/i2c.h>
14#include <linux/mfd/core.h>
15#include <linux/mfd/stmpe.h>
16#include "stmpe.h"
17
18static int __stmpe_enable(struct stmpe *stmpe, unsigned int blocks)
19{
20 return stmpe->variant->enable(stmpe, blocks, true);
21}
22
23static int __stmpe_disable(struct stmpe *stmpe, unsigned int blocks)
24{
25 return stmpe->variant->enable(stmpe, blocks, false);
26}
27
28static int __stmpe_reg_read(struct stmpe *stmpe, u8 reg)
29{
30 int ret;
31
32 ret = i2c_smbus_read_byte_data(stmpe->i2c, reg);
33 if (ret < 0)
34 dev_err(stmpe->dev, "failed to read reg %#x: %d\n",
35 reg, ret);
36
37 dev_vdbg(stmpe->dev, "rd: reg %#x => data %#x\n", reg, ret);
38
39 return ret;
40}
41
42static int __stmpe_reg_write(struct stmpe *stmpe, u8 reg, u8 val)
43{
44 int ret;
45
46 dev_vdbg(stmpe->dev, "wr: reg %#x <= %#x\n", reg, val);
47
48 ret = i2c_smbus_write_byte_data(stmpe->i2c, reg, val);
49 if (ret < 0)
50 dev_err(stmpe->dev, "failed to write reg %#x: %d\n",
51 reg, ret);
52
53 return ret;
54}
55
56static 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
70static int __stmpe_block_read(struct stmpe *stmpe, u8 reg, u8 length,
71 u8 *values)
72{
73 int ret;
74
75 ret = i2c_smbus_read_i2c_block_data(stmpe->i2c, reg, length, values);
76 if (ret < 0)
77 dev_err(stmpe->dev, "failed to read regs %#x: %d\n",
78 reg, ret);
79
80 dev_vdbg(stmpe->dev, "rd: reg %#x (%d) => ret %#x\n", reg, length, ret);
81 stmpe_dump_bytes("stmpe rd: ", values, length);
82
83 return ret;
84}
85
86static int __stmpe_block_write(struct stmpe *stmpe, u8 reg, u8 length,
87 const u8 *values)
88{
89 int ret;
90
91 dev_vdbg(stmpe->dev, "wr: regs %#x (%d)\n", reg, length);
92 stmpe_dump_bytes("stmpe wr: ", values, length);
93
94 ret = i2c_smbus_write_i2c_block_data(stmpe->i2c, reg, length,
95 values);
96 if (ret < 0)
97 dev_err(stmpe->dev, "failed to write regs %#x: %d\n",
98 reg, ret);
99
100 return ret;
101}
102
103/**
104 * stmpe_enable - enable blocks on an STMPE device
105 * @stmpe: Device to work on
106 * @blocks: Mask of blocks (enum stmpe_block values) to enable
107 */
108int stmpe_enable(struct stmpe *stmpe, unsigned int blocks)
109{
110 int ret;
111
112 mutex_lock(&stmpe->lock);
113 ret = __stmpe_enable(stmpe, blocks);
114 mutex_unlock(&stmpe->lock);
115
116 return ret;
117}
118EXPORT_SYMBOL_GPL(stmpe_enable);
119
120/**
121 * stmpe_disable - disable blocks on an STMPE device
122 * @stmpe: Device to work on
123 * @blocks: Mask of blocks (enum stmpe_block values) to enable
124 */
125int stmpe_disable(struct stmpe *stmpe, unsigned int blocks)
126{
127 int ret;
128
129 mutex_lock(&stmpe->lock);
130 ret = __stmpe_disable(stmpe, blocks);
131 mutex_unlock(&stmpe->lock);
132
133 return ret;
134}
135EXPORT_SYMBOL_GPL(stmpe_disable);
136
137/**
138 * stmpe_reg_read() - read a single STMPE register
139 * @stmpe: Device to read from
140 * @reg: Register to read
141 */
142int stmpe_reg_read(struct stmpe *stmpe, u8 reg)
143{
144 int ret;
145
146 mutex_lock(&stmpe->lock);
147 ret = __stmpe_reg_read(stmpe, reg);
148 mutex_unlock(&stmpe->lock);
149
150 return ret;
151}
152EXPORT_SYMBOL_GPL(stmpe_reg_read);
153
154/**
155 * stmpe_reg_write() - write a single STMPE register
156 * @stmpe: Device to write to
157 * @reg: Register to write
158 * @val: Value to write
159 */
160int stmpe_reg_write(struct stmpe *stmpe, u8 reg, u8 val)
161{
162 int ret;
163
164 mutex_lock(&stmpe->lock);
165 ret = __stmpe_reg_write(stmpe, reg, val);
166 mutex_unlock(&stmpe->lock);
167
168 return ret;
169}
170EXPORT_SYMBOL_GPL(stmpe_reg_write);
171
172/**
173 * stmpe_set_bits() - set the value of a bitfield in a STMPE register
174 * @stmpe: Device to write to
175 * @reg: Register to write
176 * @mask: Mask of bits to set
177 * @val: Value to set
178 */
179int stmpe_set_bits(struct stmpe *stmpe, u8 reg, u8 mask, u8 val)
180{
181 int ret;
182
183 mutex_lock(&stmpe->lock);
184 ret = __stmpe_set_bits(stmpe, reg, mask, val);
185 mutex_unlock(&stmpe->lock);
186
187 return ret;
188}
189EXPORT_SYMBOL_GPL(stmpe_set_bits);
190
191/**
192 * stmpe_block_read() - read multiple STMPE registers
193 * @stmpe: Device to read from
194 * @reg: First register
195 * @length: Number of registers
196 * @values: Buffer to write to
197 */
198int stmpe_block_read(struct stmpe *stmpe, u8 reg, u8 length, u8 *values)
199{
200 int ret;
201
202 mutex_lock(&stmpe->lock);
203 ret = __stmpe_block_read(stmpe, reg, length, values);
204 mutex_unlock(&stmpe->lock);
205
206 return ret;
207}
208EXPORT_SYMBOL_GPL(stmpe_block_read);
209
210/**
211 * stmpe_block_write() - write multiple STMPE registers
212 * @stmpe: Device to write to
213 * @reg: First register
214 * @length: Number of registers
215 * @values: Values to write
216 */
217int stmpe_block_write(struct stmpe *stmpe, u8 reg, u8 length,
218 const u8 *values)
219{
220 int ret;
221
222 mutex_lock(&stmpe->lock);
223 ret = __stmpe_block_write(stmpe, reg, length, values);
224 mutex_unlock(&stmpe->lock);
225
226 return ret;
227}
228EXPORT_SYMBOL_GPL(stmpe_block_write);
229
230/**
231 * stmpe_set_altfunc()- set the alternate function for STMPE pins
232 * @stmpe: Device to configure
233 * @pins: Bitmask of pins to affect
234 * @block: block to enable alternate functions for
235 *
236 * @pins is assumed to have a bit set for each of the bits whose alternate
237 * function is to be changed, numbered according to the GPIOXY numbers.
238 *
239 * If the GPIO module is not enabled, this function automatically enables it in
240 * order to perform the change.
241 */
242int stmpe_set_altfunc(struct stmpe *stmpe, u32 pins, enum stmpe_block block)
243{
244 struct stmpe_variant_info *variant = stmpe->variant;
245 u8 regaddr = stmpe->regs[STMPE_IDX_GPAFR_U_MSB];
246 int af_bits = variant->af_bits;
247 int numregs = DIV_ROUND_UP(stmpe->num_gpios * af_bits, 8);
248 int afperreg = 8 / af_bits;
249 int mask = (1 << af_bits) - 1;
250 u8 regs[numregs];
251 int af;
252 int ret;
253
254 mutex_lock(&stmpe->lock);
255
256 ret = __stmpe_enable(stmpe, STMPE_BLOCK_GPIO);
257 if (ret < 0)
258 goto out;
259
260 ret = __stmpe_block_read(stmpe, regaddr, numregs, regs);
261 if (ret < 0)
262 goto out;
263
264 af = variant->get_altfunc(stmpe, block);
265
266 while (pins) {
267 int pin = __ffs(pins);
268 int regoffset = numregs - (pin / afperreg) - 1;
269 int pos = (pin % afperreg) * (8 / afperreg);
270
271 regs[regoffset] &= ~(mask << pos);
272 regs[regoffset] |= af << pos;
273
274 pins &= ~(1 << pin);
275 }
276
277 ret = __stmpe_block_write(stmpe, regaddr, numregs, regs);
278
279out:
280 mutex_unlock(&stmpe->lock);
281 return ret;
282}
283EXPORT_SYMBOL_GPL(stmpe_set_altfunc);
284
285/*
286 * GPIO (all variants)
287 */
288
289static struct resource stmpe_gpio_resources[] = {
290 /* Start and end filled dynamically */
291 {
292 .flags = IORESOURCE_IRQ,
293 },
294};
295
296static struct mfd_cell stmpe_gpio_cell = {
297 .name = "stmpe-gpio",
298 .resources = stmpe_gpio_resources,
299 .num_resources = ARRAY_SIZE(stmpe_gpio_resources),
300};
301
302/*
303 * Keypad (1601, 2401, 2403)
304 */
305
306static struct resource stmpe_keypad_resources[] = {
307 {
308 .name = "KEYPAD",
309 .start = 0,
310 .end = 0,
311 .flags = IORESOURCE_IRQ,
312 },
313 {
314 .name = "KEYPAD_OVER",
315 .start = 1,
316 .end = 1,
317 .flags = IORESOURCE_IRQ,
318 },
319};
320
321static struct mfd_cell stmpe_keypad_cell = {
322 .name = "stmpe-keypad",
323 .resources = stmpe_keypad_resources,
324 .num_resources = ARRAY_SIZE(stmpe_keypad_resources),
325};
326
327/*
328 * Touchscreen (STMPE811)
329 */
330
331static struct resource stmpe_ts_resources[] = {
332 {
333 .name = "TOUCH_DET",
334 .start = 0,
335 .end = 0,
336 .flags = IORESOURCE_IRQ,
337 },
338 {
339 .name = "FIFO_TH",
340 .start = 1,
341 .end = 1,
342 .flags = IORESOURCE_IRQ,
343 },
344};
345
346static struct mfd_cell stmpe_ts_cell = {
347 .name = "stmpe-ts",
348 .resources = stmpe_ts_resources,
349 .num_resources = ARRAY_SIZE(stmpe_ts_resources),
350};
351
352/*
353 * STMPE811
354 */
355
356static const u8 stmpe811_regs[] = {
357 [STMPE_IDX_CHIP_ID] = STMPE811_REG_CHIP_ID,
358 [STMPE_IDX_ICR_LSB] = STMPE811_REG_INT_CTRL,
359 [STMPE_IDX_IER_LSB] = STMPE811_REG_INT_EN,
360 [STMPE_IDX_ISR_MSB] = STMPE811_REG_INT_STA,
361 [STMPE_IDX_GPMR_LSB] = STMPE811_REG_GPIO_MP_STA,
362 [STMPE_IDX_GPSR_LSB] = STMPE811_REG_GPIO_SET_PIN,
363 [STMPE_IDX_GPCR_LSB] = STMPE811_REG_GPIO_CLR_PIN,
364 [STMPE_IDX_GPDR_LSB] = STMPE811_REG_GPIO_DIR,
365 [STMPE_IDX_GPRER_LSB] = STMPE811_REG_GPIO_RE,
366 [STMPE_IDX_GPFER_LSB] = STMPE811_REG_GPIO_FE,
367 [STMPE_IDX_GPAFR_U_MSB] = STMPE811_REG_GPIO_AF,
368 [STMPE_IDX_IEGPIOR_LSB] = STMPE811_REG_GPIO_INT_EN,
369 [STMPE_IDX_ISGPIOR_MSB] = STMPE811_REG_GPIO_INT_STA,
370 [STMPE_IDX_GPEDR_MSB] = STMPE811_REG_GPIO_ED,
371};
372
373static struct stmpe_variant_block stmpe811_blocks[] = {
374 {
375 .cell = &stmpe_gpio_cell,
376 .irq = STMPE811_IRQ_GPIOC,
377 .block = STMPE_BLOCK_GPIO,
378 },
379 {
380 .cell = &stmpe_ts_cell,
381 .irq = STMPE811_IRQ_TOUCH_DET,
382 .block = STMPE_BLOCK_TOUCHSCREEN,
383 },
384};
385
386static int stmpe811_enable(struct stmpe *stmpe, unsigned int blocks,
387 bool enable)
388{
389 unsigned int mask = 0;
390
391 if (blocks & STMPE_BLOCK_GPIO)
392 mask |= STMPE811_SYS_CTRL2_GPIO_OFF;
393
394 if (blocks & STMPE_BLOCK_ADC)
395 mask |= STMPE811_SYS_CTRL2_ADC_OFF;
396
397 if (blocks & STMPE_BLOCK_TOUCHSCREEN)
398 mask |= STMPE811_SYS_CTRL2_TSC_OFF;
399
400 return __stmpe_set_bits(stmpe, STMPE811_REG_SYS_CTRL2, mask,
401 enable ? 0 : mask);
402}
403
404static int stmpe811_get_altfunc(struct stmpe *stmpe, enum stmpe_block block)
405{
406 /* 0 for touchscreen, 1 for GPIO */
407 return block != STMPE_BLOCK_TOUCHSCREEN;
408}
409
410static struct stmpe_variant_info stmpe811 = {
411 .name = "stmpe811",
412 .id_val = 0x0811,
413 .id_mask = 0xffff,
414 .num_gpios = 8,
415 .af_bits = 1,
416 .regs = stmpe811_regs,
417 .blocks = stmpe811_blocks,
418 .num_blocks = ARRAY_SIZE(stmpe811_blocks),
419 .num_irqs = STMPE811_NR_INTERNAL_IRQS,
420 .enable = stmpe811_enable,
421 .get_altfunc = stmpe811_get_altfunc,
422};
423
424/*
425 * STMPE1601
426 */
427
428static const u8 stmpe1601_regs[] = {
429 [STMPE_IDX_CHIP_ID] = STMPE1601_REG_CHIP_ID,
430 [STMPE_IDX_ICR_LSB] = STMPE1601_REG_ICR_LSB,
431 [STMPE_IDX_IER_LSB] = STMPE1601_REG_IER_LSB,
432 [STMPE_IDX_ISR_MSB] = STMPE1601_REG_ISR_MSB,
433 [STMPE_IDX_GPMR_LSB] = STMPE1601_REG_GPIO_MP_LSB,
434 [STMPE_IDX_GPSR_LSB] = STMPE1601_REG_GPIO_SET_LSB,
435 [STMPE_IDX_GPCR_LSB] = STMPE1601_REG_GPIO_CLR_LSB,
436 [STMPE_IDX_GPDR_LSB] = STMPE1601_REG_GPIO_SET_DIR_LSB,
437 [STMPE_IDX_GPRER_LSB] = STMPE1601_REG_GPIO_RE_LSB,
438 [STMPE_IDX_GPFER_LSB] = STMPE1601_REG_GPIO_FE_LSB,
439 [STMPE_IDX_GPAFR_U_MSB] = STMPE1601_REG_GPIO_AF_U_MSB,
440 [STMPE_IDX_IEGPIOR_LSB] = STMPE1601_REG_INT_EN_GPIO_MASK_LSB,
441 [STMPE_IDX_ISGPIOR_MSB] = STMPE1601_REG_INT_STA_GPIO_MSB,
442 [STMPE_IDX_GPEDR_MSB] = STMPE1601_REG_GPIO_ED_MSB,
443};
444
445static struct stmpe_variant_block stmpe1601_blocks[] = {
446 {
447 .cell = &stmpe_gpio_cell,
448 .irq = STMPE24XX_IRQ_GPIOC,
449 .block = STMPE_BLOCK_GPIO,
450 },
451 {
452 .cell = &stmpe_keypad_cell,
453 .irq = STMPE24XX_IRQ_KEYPAD,
454 .block = STMPE_BLOCK_KEYPAD,
455 },
456};
457
458/* supported autosleep timeout delay (in msecs) */
459static const int stmpe_autosleep_delay[] = {
460 4, 16, 32, 64, 128, 256, 512, 1024,
461};
462
463static int stmpe_round_timeout(int timeout)
464{
465 int i;
466
467 for (i = 0; i < ARRAY_SIZE(stmpe_autosleep_delay); i++) {
468 if (stmpe_autosleep_delay[i] >= timeout)
469 return i;
470 }
471
472 /*
473 * requests for delays longer than supported should not return the
474 * longest supported delay
475 */
476 return -EINVAL;
477}
478
479static int stmpe_autosleep(struct stmpe *stmpe, int autosleep_timeout)
480{
481 int ret;
482
483 if (!stmpe->variant->enable_autosleep)
484 return -ENOSYS;
485
486 mutex_lock(&stmpe->lock);
487 ret = stmpe->variant->enable_autosleep(stmpe, autosleep_timeout);
488 mutex_unlock(&stmpe->lock);
489
490 return ret;
491}
492
493/*
494 * Both stmpe 1601/2403 support same layout for autosleep
495 */
496static int stmpe1601_autosleep(struct stmpe *stmpe,
497 int autosleep_timeout)
498{
499 int ret, timeout;
500
501 /* choose the best available timeout */
502 timeout = stmpe_round_timeout(autosleep_timeout);
503 if (timeout < 0) {
504 dev_err(stmpe->dev, "invalid timeout\n");
505 return timeout;
506 }
507
508 ret = __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL2,
509 STMPE1601_AUTOSLEEP_TIMEOUT_MASK,
510 timeout);
511 if (ret < 0)
512 return ret;
513
514 return __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL2,
515 STPME1601_AUTOSLEEP_ENABLE,
516 STPME1601_AUTOSLEEP_ENABLE);
517}
518
519static int stmpe1601_enable(struct stmpe *stmpe, unsigned int blocks,
520 bool enable)
521{
522 unsigned int mask = 0;
523
524 if (blocks & STMPE_BLOCK_GPIO)
525 mask |= STMPE1601_SYS_CTRL_ENABLE_GPIO;
526
527 if (blocks & STMPE_BLOCK_KEYPAD)
528 mask |= STMPE1601_SYS_CTRL_ENABLE_KPC;
529
530 return __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL, mask,
531 enable ? mask : 0);
532}
533
534static int stmpe1601_get_altfunc(struct stmpe *stmpe, enum stmpe_block block)
535{
536 switch (block) {
537 case STMPE_BLOCK_PWM:
538 return 2;
539
540 case STMPE_BLOCK_KEYPAD:
541 return 1;
542
543 case STMPE_BLOCK_GPIO:
544 default:
545 return 0;
546 }
547}
548
549static struct stmpe_variant_info stmpe1601 = {
550 .name = "stmpe1601",
551 .id_val = 0x0210,
552 .id_mask = 0xfff0, /* at least 0x0210 and 0x0212 */
553 .num_gpios = 16,
554 .af_bits = 2,
555 .regs = stmpe1601_regs,
556 .blocks = stmpe1601_blocks,
557 .num_blocks = ARRAY_SIZE(stmpe1601_blocks),
558 .num_irqs = STMPE1601_NR_INTERNAL_IRQS,
559 .enable = stmpe1601_enable,
560 .get_altfunc = stmpe1601_get_altfunc,
561 .enable_autosleep = stmpe1601_autosleep,
562};
563
564/*
565 * STMPE24XX
566 */
567
568static const u8 stmpe24xx_regs[] = {
569 [STMPE_IDX_CHIP_ID] = STMPE24XX_REG_CHIP_ID,
570 [STMPE_IDX_ICR_LSB] = STMPE24XX_REG_ICR_LSB,
571 [STMPE_IDX_IER_LSB] = STMPE24XX_REG_IER_LSB,
572 [STMPE_IDX_ISR_MSB] = STMPE24XX_REG_ISR_MSB,
573 [STMPE_IDX_GPMR_LSB] = STMPE24XX_REG_GPMR_LSB,
574 [STMPE_IDX_GPSR_LSB] = STMPE24XX_REG_GPSR_LSB,
575 [STMPE_IDX_GPCR_LSB] = STMPE24XX_REG_GPCR_LSB,
576 [STMPE_IDX_GPDR_LSB] = STMPE24XX_REG_GPDR_LSB,
577 [STMPE_IDX_GPRER_LSB] = STMPE24XX_REG_GPRER_LSB,
578 [STMPE_IDX_GPFER_LSB] = STMPE24XX_REG_GPFER_LSB,
579 [STMPE_IDX_GPAFR_U_MSB] = STMPE24XX_REG_GPAFR_U_MSB,
580 [STMPE_IDX_IEGPIOR_LSB] = STMPE24XX_REG_IEGPIOR_LSB,
581 [STMPE_IDX_ISGPIOR_MSB] = STMPE24XX_REG_ISGPIOR_MSB,
582 [STMPE_IDX_GPEDR_MSB] = STMPE24XX_REG_GPEDR_MSB,
583};
584
585static struct stmpe_variant_block stmpe24xx_blocks[] = {
586 {
587 .cell = &stmpe_gpio_cell,
588 .irq = STMPE24XX_IRQ_GPIOC,
589 .block = STMPE_BLOCK_GPIO,
590 },
591 {
592 .cell = &stmpe_keypad_cell,
593 .irq = STMPE24XX_IRQ_KEYPAD,
594 .block = STMPE_BLOCK_KEYPAD,
595 },
596};
597
598static int stmpe24xx_enable(struct stmpe *stmpe, unsigned int blocks,
599 bool enable)
600{
601 unsigned int mask = 0;
602
603 if (blocks & STMPE_BLOCK_GPIO)
604 mask |= STMPE24XX_SYS_CTRL_ENABLE_GPIO;
605
606 if (blocks & STMPE_BLOCK_KEYPAD)
607 mask |= STMPE24XX_SYS_CTRL_ENABLE_KPC;
608
609 return __stmpe_set_bits(stmpe, STMPE24XX_REG_SYS_CTRL, mask,
610 enable ? mask : 0);
611}
612
613static int stmpe24xx_get_altfunc(struct stmpe *stmpe, enum stmpe_block block)
614{
615 switch (block) {
616 case STMPE_BLOCK_ROTATOR:
617 return 2;
618
619 case STMPE_BLOCK_KEYPAD:
620 return 1;
621
622 case STMPE_BLOCK_GPIO:
623 default:
624 return 0;
625 }
626}
627
628static struct stmpe_variant_info stmpe2401 = {
629 .name = "stmpe2401",
630 .id_val = 0x0101,
631 .id_mask = 0xffff,
632 .num_gpios = 24,
633 .af_bits = 2,
634 .regs = stmpe24xx_regs,
635 .blocks = stmpe24xx_blocks,
636 .num_blocks = ARRAY_SIZE(stmpe24xx_blocks),
637 .num_irqs = STMPE24XX_NR_INTERNAL_IRQS,
638 .enable = stmpe24xx_enable,
639 .get_altfunc = stmpe24xx_get_altfunc,
640};
641
642static struct stmpe_variant_info stmpe2403 = {
643 .name = "stmpe2403",
644 .id_val = 0x0120,
645 .id_mask = 0xffff,
646 .num_gpios = 24,
647 .af_bits = 2,
648 .regs = stmpe24xx_regs,
649 .blocks = stmpe24xx_blocks,
650 .num_blocks = ARRAY_SIZE(stmpe24xx_blocks),
651 .num_irqs = STMPE24XX_NR_INTERNAL_IRQS,
652 .enable = stmpe24xx_enable,
653 .get_altfunc = stmpe24xx_get_altfunc,
654 .enable_autosleep = stmpe1601_autosleep, /* same as stmpe1601 */
655};
656
657static struct stmpe_variant_info *stmpe_variant_info[] = {
658 [STMPE811] = &stmpe811,
659 [STMPE1601] = &stmpe1601,
660 [STMPE2401] = &stmpe2401,
661 [STMPE2403] = &stmpe2403,
662};
663
664static irqreturn_t stmpe_irq(int irq, void *data)
665{
666 struct stmpe *stmpe = data;
667 struct stmpe_variant_info *variant = stmpe->variant;
668 int num = DIV_ROUND_UP(variant->num_irqs, 8);
669 u8 israddr = stmpe->regs[STMPE_IDX_ISR_MSB];
670 u8 isr[num];
671 int ret;
672 int i;
673
674 ret = stmpe_block_read(stmpe, israddr, num, isr);
675 if (ret < 0)
676 return IRQ_NONE;
677
678 for (i = 0; i < num; i++) {
679 int bank = num - i - 1;
680 u8 status = isr[i];
681 u8 clear;
682
683 status &= stmpe->ier[bank];
684 if (!status)
685 continue;
686
687 clear = status;
688 while (status) {
689 int bit = __ffs(status);
690 int line = bank * 8 + bit;
691
692 handle_nested_irq(stmpe->irq_base + line);
693 status &= ~(1 << bit);
694 }
695
696 stmpe_reg_write(stmpe, israddr + i, clear);
697 }
698
699 return IRQ_HANDLED;
700}
701
702static void stmpe_irq_lock(struct irq_data *data)
703{
704 struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
705
706 mutex_lock(&stmpe->irq_lock);
707}
708
709static void stmpe_irq_sync_unlock(struct irq_data *data)
710{
711 struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
712 struct stmpe_variant_info *variant = stmpe->variant;
713 int num = DIV_ROUND_UP(variant->num_irqs, 8);
714 int i;
715
716 for (i = 0; i < num; i++) {
717 u8 new = stmpe->ier[i];
718 u8 old = stmpe->oldier[i];
719
720 if (new == old)
721 continue;
722
723 stmpe->oldier[i] = new;
724 stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_IER_LSB] - i, new);
725 }
726
727 mutex_unlock(&stmpe->irq_lock);
728}
729
730static void stmpe_irq_mask(struct irq_data *data)
731{
732 struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
733 int offset = data->irq - stmpe->irq_base;
734 int regoffset = offset / 8;
735 int mask = 1 << (offset % 8);
736
737 stmpe->ier[regoffset] &= ~mask;
738}
739
740static void stmpe_irq_unmask(struct irq_data *data)
741{
742 struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
743 int offset = data->irq - stmpe->irq_base;
744 int regoffset = offset / 8;
745 int mask = 1 << (offset % 8);
746
747 stmpe->ier[regoffset] |= mask;
748}
749
750static struct irq_chip stmpe_irq_chip = {
751 .name = "stmpe",
752 .irq_bus_lock = stmpe_irq_lock,
753 .irq_bus_sync_unlock = stmpe_irq_sync_unlock,
754 .irq_mask = stmpe_irq_mask,
755 .irq_unmask = stmpe_irq_unmask,
756};
757
758static int __devinit stmpe_irq_init(struct stmpe *stmpe)
759{
760 int num_irqs = stmpe->variant->num_irqs;
761 int base = stmpe->irq_base;
762 int irq;
763
764 for (irq = base; irq < base + num_irqs; irq++) {
765 irq_set_chip_data(irq, stmpe);
766 irq_set_chip_and_handler(irq, &stmpe_irq_chip,
767 handle_edge_irq);
768 irq_set_nested_thread(irq, 1);
769#ifdef CONFIG_ARM
770 set_irq_flags(irq, IRQF_VALID);
771#else
772 irq_set_noprobe(irq);
773#endif
774 }
775
776 return 0;
777}
778
779static void stmpe_irq_remove(struct stmpe *stmpe)
780{
781 int num_irqs = stmpe->variant->num_irqs;
782 int base = stmpe->irq_base;
783 int irq;
784
785 for (irq = base; irq < base + num_irqs; irq++) {
786#ifdef CONFIG_ARM
787 set_irq_flags(irq, 0);
788#endif
789 irq_set_chip_and_handler(irq, NULL, NULL);
790 irq_set_chip_data(irq, NULL);
791 }
792}
793
794static int __devinit stmpe_chip_init(struct stmpe *stmpe)
795{
796 unsigned int irq_trigger = stmpe->pdata->irq_trigger;
797 int autosleep_timeout = stmpe->pdata->autosleep_timeout;
798 struct stmpe_variant_info *variant = stmpe->variant;
799 u8 icr = STMPE_ICR_LSB_GIM;
800 unsigned int id;
801 u8 data[2];
802 int ret;
803
804 ret = stmpe_block_read(stmpe, stmpe->regs[STMPE_IDX_CHIP_ID],
805 ARRAY_SIZE(data), data);
806 if (ret < 0)
807 return ret;
808
809 id = (data[0] << 8) | data[1];
810 if ((id & variant->id_mask) != variant->id_val) {
811 dev_err(stmpe->dev, "unknown chip id: %#x\n", id);
812 return -EINVAL;
813 }
814
815 dev_info(stmpe->dev, "%s detected, chip id: %#x\n", variant->name, id);
816
817 /* Disable all modules -- subdrivers should enable what they need. */
818 ret = stmpe_disable(stmpe, ~0);
819 if (ret)
820 return ret;
821
822 if (irq_trigger == IRQF_TRIGGER_FALLING ||
823 irq_trigger == IRQF_TRIGGER_RISING)
824 icr |= STMPE_ICR_LSB_EDGE;
825
826 if (irq_trigger == IRQF_TRIGGER_RISING ||
827 irq_trigger == IRQF_TRIGGER_HIGH)
828 icr |= STMPE_ICR_LSB_HIGH;
829
830 if (stmpe->pdata->irq_invert_polarity)
831 icr ^= STMPE_ICR_LSB_HIGH;
832
833 if (stmpe->pdata->autosleep) {
834 ret = stmpe_autosleep(stmpe, autosleep_timeout);
835 if (ret)
836 return ret;
837 }
838
839 return stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_ICR_LSB], icr);
840}
841
842static int __devinit stmpe_add_device(struct stmpe *stmpe,
843 struct mfd_cell *cell, int irq)
844{
845 return mfd_add_devices(stmpe->dev, stmpe->pdata->id, cell, 1,
846 NULL, stmpe->irq_base + irq);
847}
848
849static int __devinit stmpe_devices_init(struct stmpe *stmpe)
850{
851 struct stmpe_variant_info *variant = stmpe->variant;
852 unsigned int platform_blocks = stmpe->pdata->blocks;
853 int ret = -EINVAL;
854 int i;
855
856 for (i = 0; i < variant->num_blocks; i++) {
857 struct stmpe_variant_block *block = &variant->blocks[i];
858
859 if (!(platform_blocks & block->block))
860 continue;
861
862 platform_blocks &= ~block->block;
863 ret = stmpe_add_device(stmpe, block->cell, block->irq);
864 if (ret)
865 return ret;
866 }
867
868 if (platform_blocks)
869 dev_warn(stmpe->dev,
870 "platform wants blocks (%#x) not present on variant",
871 platform_blocks);
872
873 return ret;
874}
875
876#ifdef CONFIG_PM
877static int stmpe_suspend(struct device *dev)
878{
879 struct i2c_client *i2c = to_i2c_client(dev);
880
881 if (device_may_wakeup(&i2c->dev))
882 enable_irq_wake(i2c->irq);
883
884 return 0;
885}
886
887static int stmpe_resume(struct device *dev)
888{
889 struct i2c_client *i2c = to_i2c_client(dev);
890
891 if (device_may_wakeup(&i2c->dev))
892 disable_irq_wake(i2c->irq);
893
894 return 0;
895}
896#endif
897
898static int __devinit stmpe_probe(struct i2c_client *i2c,
899 const struct i2c_device_id *id)
900{
901 struct stmpe_platform_data *pdata = i2c->dev.platform_data;
902 struct stmpe *stmpe;
903 int ret;
904
905 if (!pdata)
906 return -EINVAL;
907
908 stmpe = kzalloc(sizeof(struct stmpe), GFP_KERNEL);
909 if (!stmpe)
910 return -ENOMEM;
911
912 mutex_init(&stmpe->irq_lock);
913 mutex_init(&stmpe->lock);
914
915 stmpe->dev = &i2c->dev;
916 stmpe->i2c = i2c;
917
918 stmpe->pdata = pdata;
919 stmpe->irq_base = pdata->irq_base;
920
921 stmpe->partnum = id->driver_data;
922 stmpe->variant = stmpe_variant_info[stmpe->partnum];
923 stmpe->regs = stmpe->variant->regs;
924 stmpe->num_gpios = stmpe->variant->num_gpios;
925
926 i2c_set_clientdata(i2c, stmpe);
927
928 ret = stmpe_chip_init(stmpe);
929 if (ret)
930 goto out_free;
931
932 ret = stmpe_irq_init(stmpe);
933 if (ret)
934 goto out_free;
935
936 ret = request_threaded_irq(stmpe->i2c->irq, NULL, stmpe_irq,
937 pdata->irq_trigger | IRQF_ONESHOT,
938 "stmpe", stmpe);
939 if (ret) {
940 dev_err(stmpe->dev, "failed to request IRQ: %d\n", ret);
941 goto out_removeirq;
942 }
943
944 ret = stmpe_devices_init(stmpe);
945 if (ret) {
946 dev_err(stmpe->dev, "failed to add children\n");
947 goto out_removedevs;
948 }
949
950 return 0;
951
952out_removedevs:
953 mfd_remove_devices(stmpe->dev);
954 free_irq(stmpe->i2c->irq, stmpe);
955out_removeirq:
956 stmpe_irq_remove(stmpe);
957out_free:
958 kfree(stmpe);
959 return ret;
960}
961
962static int __devexit stmpe_remove(struct i2c_client *client)
963{
964 struct stmpe *stmpe = i2c_get_clientdata(client);
965
966 mfd_remove_devices(stmpe->dev);
967
968 free_irq(stmpe->i2c->irq, stmpe);
969 stmpe_irq_remove(stmpe);
970
971 kfree(stmpe);
972
973 return 0;
974}
975
976static const struct i2c_device_id stmpe_id[] = {
977 { "stmpe811", STMPE811 },
978 { "stmpe1601", STMPE1601 },
979 { "stmpe2401", STMPE2401 },
980 { "stmpe2403", STMPE2403 },
981 { }
982};
983MODULE_DEVICE_TABLE(i2c, stmpe_id);
984
985#ifdef CONFIG_PM
986static const struct dev_pm_ops stmpe_dev_pm_ops = {
987 .suspend = stmpe_suspend,
988 .resume = stmpe_resume,
989};
990#endif
991
992static struct i2c_driver stmpe_driver = {
993 .driver.name = "stmpe",
994 .driver.owner = THIS_MODULE,
995#ifdef CONFIG_PM
996 .driver.pm = &stmpe_dev_pm_ops,
997#endif
998 .probe = stmpe_probe,
999 .remove = __devexit_p(stmpe_remove),
1000 .id_table = stmpe_id,
1001};
1002
1003static int __init stmpe_init(void)
1004{
1005 return i2c_add_driver(&stmpe_driver);
1006}
1007subsys_initcall(stmpe_init);
1008
1009static void __exit stmpe_exit(void)
1010{
1011 i2c_del_driver(&stmpe_driver);
1012}
1013module_exit(stmpe_exit);
1014
1015MODULE_LICENSE("GPL v2");
1016MODULE_DESCRIPTION("STMPE MFD core driver");
1017MODULE_AUTHOR("Rabin Vincent <rabin.vincent@stericsson.com>");
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 */
37struct 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
47static int __stmpe_enable(struct stmpe *stmpe, unsigned int blocks)
48{
49 return stmpe->variant->enable(stmpe, blocks, true);
50}
51
52static int __stmpe_disable(struct stmpe *stmpe, unsigned int blocks)
53{
54 return stmpe->variant->enable(stmpe, blocks, false);
55}
56
57static 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
70static 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
83static 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
97static 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
112static 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 */
132int 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}
142EXPORT_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 */
149int 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}
159EXPORT_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 */
166int 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}
176EXPORT_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 */
184int 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}
194EXPORT_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 */
203int 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}
213EXPORT_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 */
222int 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}
232EXPORT_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 */
241int 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}
252EXPORT_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 */
266int 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
305out:
306 mutex_unlock(&stmpe->lock);
307 return ret;
308}
309EXPORT_SYMBOL_GPL(stmpe_set_altfunc);
310
311/*
312 * GPIO (all variants)
313 */
314
315static struct resource stmpe_gpio_resources[] = {
316 /* Start and end filled dynamically */
317 {
318 .flags = IORESOURCE_IRQ,
319 },
320};
321
322static 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
329static 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
339static 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
350static 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 */
360static 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
375static 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 */
385static 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
397static struct stmpe_variant_block stmpe801_blocks[] = {
398 {
399 .cell = &stmpe_gpio_cell,
400 .irq = 0,
401 .block = STMPE_BLOCK_GPIO,
402 },
403};
404
405static struct stmpe_variant_block stmpe801_blocks_noirq[] = {
406 {
407 .cell = &stmpe_gpio_cell_noirq,
408 .block = STMPE_BLOCK_GPIO,
409 },
410};
411
412static 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
421static 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
433static 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
448static 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
459static 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
470static const u8 stmpe811_regs[] = {
471 [STMPE_IDX_CHIP_ID] = STMPE811_REG_CHIP_ID,
472 [STMPE_IDX_SYS_CTRL] = STMPE811_REG_SYS_CTRL,
473 [STMPE_IDX_SYS_CTRL2] = STMPE811_REG_SYS_CTRL2,
474 [STMPE_IDX_ICR_LSB] = STMPE811_REG_INT_CTRL,
475 [STMPE_IDX_IER_LSB] = STMPE811_REG_INT_EN,
476 [STMPE_IDX_ISR_MSB] = STMPE811_REG_INT_STA,
477 [STMPE_IDX_GPMR_LSB] = STMPE811_REG_GPIO_MP_STA,
478 [STMPE_IDX_GPSR_LSB] = STMPE811_REG_GPIO_SET_PIN,
479 [STMPE_IDX_GPCR_LSB] = STMPE811_REG_GPIO_CLR_PIN,
480 [STMPE_IDX_GPDR_LSB] = STMPE811_REG_GPIO_DIR,
481 [STMPE_IDX_GPRER_LSB] = STMPE811_REG_GPIO_RE,
482 [STMPE_IDX_GPFER_LSB] = STMPE811_REG_GPIO_FE,
483 [STMPE_IDX_GPAFR_U_MSB] = STMPE811_REG_GPIO_AF,
484 [STMPE_IDX_IEGPIOR_LSB] = STMPE811_REG_GPIO_INT_EN,
485 [STMPE_IDX_ISGPIOR_MSB] = STMPE811_REG_GPIO_INT_STA,
486 [STMPE_IDX_GPEDR_LSB] = STMPE811_REG_GPIO_ED,
487};
488
489static struct stmpe_variant_block stmpe811_blocks[] = {
490 {
491 .cell = &stmpe_gpio_cell,
492 .irq = STMPE811_IRQ_GPIOC,
493 .block = STMPE_BLOCK_GPIO,
494 },
495 {
496 .cell = &stmpe_ts_cell,
497 .irq = STMPE811_IRQ_TOUCH_DET,
498 .block = STMPE_BLOCK_TOUCHSCREEN,
499 },
500};
501
502static int stmpe811_enable(struct stmpe *stmpe, unsigned int blocks,
503 bool enable)
504{
505 unsigned int mask = 0;
506
507 if (blocks & STMPE_BLOCK_GPIO)
508 mask |= STMPE811_SYS_CTRL2_GPIO_OFF;
509
510 if (blocks & STMPE_BLOCK_ADC)
511 mask |= STMPE811_SYS_CTRL2_ADC_OFF;
512
513 if (blocks & STMPE_BLOCK_TOUCHSCREEN)
514 mask |= STMPE811_SYS_CTRL2_TSC_OFF;
515
516 return __stmpe_set_bits(stmpe, stmpe->regs[STMPE_IDX_SYS_CTRL2], mask,
517 enable ? 0 : mask);
518}
519
520static int stmpe811_get_altfunc(struct stmpe *stmpe, enum stmpe_block block)
521{
522 /* 0 for touchscreen, 1 for GPIO */
523 return block != STMPE_BLOCK_TOUCHSCREEN;
524}
525
526static struct stmpe_variant_info stmpe811 = {
527 .name = "stmpe811",
528 .id_val = 0x0811,
529 .id_mask = 0xffff,
530 .num_gpios = 8,
531 .af_bits = 1,
532 .regs = stmpe811_regs,
533 .blocks = stmpe811_blocks,
534 .num_blocks = ARRAY_SIZE(stmpe811_blocks),
535 .num_irqs = STMPE811_NR_INTERNAL_IRQS,
536 .enable = stmpe811_enable,
537 .get_altfunc = stmpe811_get_altfunc,
538};
539
540/* Similar to 811, except number of gpios */
541static struct stmpe_variant_info stmpe610 = {
542 .name = "stmpe610",
543 .id_val = 0x0811,
544 .id_mask = 0xffff,
545 .num_gpios = 6,
546 .af_bits = 1,
547 .regs = stmpe811_regs,
548 .blocks = stmpe811_blocks,
549 .num_blocks = ARRAY_SIZE(stmpe811_blocks),
550 .num_irqs = STMPE811_NR_INTERNAL_IRQS,
551 .enable = stmpe811_enable,
552 .get_altfunc = stmpe811_get_altfunc,
553};
554
555/*
556 * STMPE1600
557 * Compared to all others STMPE variant, LSB and MSB regs are located in this
558 * order : LSB addr
559 * MSB addr + 1
560 * As there is only 2 * 8bits registers for GPMR/GPSR/IEGPIOPR, CSB index is MSB registers
561 */
562
563static const u8 stmpe1600_regs[] = {
564 [STMPE_IDX_CHIP_ID] = STMPE1600_REG_CHIP_ID,
565 [STMPE_IDX_SYS_CTRL] = STMPE1600_REG_SYS_CTRL,
566 [STMPE_IDX_ICR_LSB] = STMPE1600_REG_SYS_CTRL,
567 [STMPE_IDX_GPMR_LSB] = STMPE1600_REG_GPMR_LSB,
568 [STMPE_IDX_GPMR_CSB] = STMPE1600_REG_GPMR_MSB,
569 [STMPE_IDX_GPSR_LSB] = STMPE1600_REG_GPSR_LSB,
570 [STMPE_IDX_GPSR_CSB] = STMPE1600_REG_GPSR_MSB,
571 [STMPE_IDX_GPDR_LSB] = STMPE1600_REG_GPDR_LSB,
572 [STMPE_IDX_GPDR_CSB] = STMPE1600_REG_GPDR_MSB,
573 [STMPE_IDX_IEGPIOR_LSB] = STMPE1600_REG_IEGPIOR_LSB,
574 [STMPE_IDX_IEGPIOR_CSB] = STMPE1600_REG_IEGPIOR_MSB,
575 [STMPE_IDX_ISGPIOR_LSB] = STMPE1600_REG_ISGPIOR_LSB,
576};
577
578static struct stmpe_variant_block stmpe1600_blocks[] = {
579 {
580 .cell = &stmpe_gpio_cell,
581 .irq = 0,
582 .block = STMPE_BLOCK_GPIO,
583 },
584};
585
586static int stmpe1600_enable(struct stmpe *stmpe, unsigned int blocks,
587 bool enable)
588{
589 if (blocks & STMPE_BLOCK_GPIO)
590 return 0;
591 else
592 return -EINVAL;
593}
594
595static struct stmpe_variant_info stmpe1600 = {
596 .name = "stmpe1600",
597 .id_val = STMPE1600_ID,
598 .id_mask = 0xffff,
599 .num_gpios = 16,
600 .af_bits = 0,
601 .regs = stmpe1600_regs,
602 .blocks = stmpe1600_blocks,
603 .num_blocks = ARRAY_SIZE(stmpe1600_blocks),
604 .num_irqs = STMPE1600_NR_INTERNAL_IRQS,
605 .enable = stmpe1600_enable,
606};
607
608/*
609 * STMPE1601
610 */
611
612static const u8 stmpe1601_regs[] = {
613 [STMPE_IDX_CHIP_ID] = STMPE1601_REG_CHIP_ID,
614 [STMPE_IDX_SYS_CTRL] = STMPE1601_REG_SYS_CTRL,
615 [STMPE_IDX_SYS_CTRL2] = STMPE1601_REG_SYS_CTRL2,
616 [STMPE_IDX_ICR_LSB] = STMPE1601_REG_ICR_LSB,
617 [STMPE_IDX_IER_MSB] = STMPE1601_REG_IER_MSB,
618 [STMPE_IDX_IER_LSB] = STMPE1601_REG_IER_LSB,
619 [STMPE_IDX_ISR_MSB] = STMPE1601_REG_ISR_MSB,
620 [STMPE_IDX_GPMR_LSB] = STMPE1601_REG_GPIO_MP_LSB,
621 [STMPE_IDX_GPMR_CSB] = STMPE1601_REG_GPIO_MP_MSB,
622 [STMPE_IDX_GPSR_LSB] = STMPE1601_REG_GPIO_SET_LSB,
623 [STMPE_IDX_GPSR_CSB] = STMPE1601_REG_GPIO_SET_MSB,
624 [STMPE_IDX_GPCR_LSB] = STMPE1601_REG_GPIO_CLR_LSB,
625 [STMPE_IDX_GPCR_CSB] = STMPE1601_REG_GPIO_CLR_MSB,
626 [STMPE_IDX_GPDR_LSB] = STMPE1601_REG_GPIO_SET_DIR_LSB,
627 [STMPE_IDX_GPDR_CSB] = STMPE1601_REG_GPIO_SET_DIR_MSB,
628 [STMPE_IDX_GPEDR_LSB] = STMPE1601_REG_GPIO_ED_LSB,
629 [STMPE_IDX_GPEDR_CSB] = STMPE1601_REG_GPIO_ED_MSB,
630 [STMPE_IDX_GPRER_LSB] = STMPE1601_REG_GPIO_RE_LSB,
631 [STMPE_IDX_GPRER_CSB] = STMPE1601_REG_GPIO_RE_MSB,
632 [STMPE_IDX_GPFER_LSB] = STMPE1601_REG_GPIO_FE_LSB,
633 [STMPE_IDX_GPFER_CSB] = STMPE1601_REG_GPIO_FE_MSB,
634 [STMPE_IDX_GPPUR_LSB] = STMPE1601_REG_GPIO_PU_LSB,
635 [STMPE_IDX_GPAFR_U_MSB] = STMPE1601_REG_GPIO_AF_U_MSB,
636 [STMPE_IDX_IEGPIOR_LSB] = STMPE1601_REG_INT_EN_GPIO_MASK_LSB,
637 [STMPE_IDX_IEGPIOR_CSB] = STMPE1601_REG_INT_EN_GPIO_MASK_MSB,
638 [STMPE_IDX_ISGPIOR_MSB] = STMPE1601_REG_INT_STA_GPIO_MSB,
639};
640
641static struct stmpe_variant_block stmpe1601_blocks[] = {
642 {
643 .cell = &stmpe_gpio_cell,
644 .irq = STMPE1601_IRQ_GPIOC,
645 .block = STMPE_BLOCK_GPIO,
646 },
647 {
648 .cell = &stmpe_keypad_cell,
649 .irq = STMPE1601_IRQ_KEYPAD,
650 .block = STMPE_BLOCK_KEYPAD,
651 },
652 {
653 .cell = &stmpe_pwm_cell,
654 .irq = STMPE1601_IRQ_PWM0,
655 .block = STMPE_BLOCK_PWM,
656 },
657};
658
659/* supported autosleep timeout delay (in msecs) */
660static const int stmpe_autosleep_delay[] = {
661 4, 16, 32, 64, 128, 256, 512, 1024,
662};
663
664static int stmpe_round_timeout(int timeout)
665{
666 int i;
667
668 for (i = 0; i < ARRAY_SIZE(stmpe_autosleep_delay); i++) {
669 if (stmpe_autosleep_delay[i] >= timeout)
670 return i;
671 }
672
673 /*
674 * requests for delays longer than supported should not return the
675 * longest supported delay
676 */
677 return -EINVAL;
678}
679
680static int stmpe_autosleep(struct stmpe *stmpe, int autosleep_timeout)
681{
682 int ret;
683
684 if (!stmpe->variant->enable_autosleep)
685 return -ENOSYS;
686
687 mutex_lock(&stmpe->lock);
688 ret = stmpe->variant->enable_autosleep(stmpe, autosleep_timeout);
689 mutex_unlock(&stmpe->lock);
690
691 return ret;
692}
693
694/*
695 * Both stmpe 1601/2403 support same layout for autosleep
696 */
697static int stmpe1601_autosleep(struct stmpe *stmpe,
698 int autosleep_timeout)
699{
700 int ret, timeout;
701
702 /* choose the best available timeout */
703 timeout = stmpe_round_timeout(autosleep_timeout);
704 if (timeout < 0) {
705 dev_err(stmpe->dev, "invalid timeout\n");
706 return timeout;
707 }
708
709 ret = __stmpe_set_bits(stmpe, stmpe->regs[STMPE_IDX_SYS_CTRL2],
710 STMPE1601_AUTOSLEEP_TIMEOUT_MASK,
711 timeout);
712 if (ret < 0)
713 return ret;
714
715 return __stmpe_set_bits(stmpe, stmpe->regs[STMPE_IDX_SYS_CTRL2],
716 STPME1601_AUTOSLEEP_ENABLE,
717 STPME1601_AUTOSLEEP_ENABLE);
718}
719
720static int stmpe1601_enable(struct stmpe *stmpe, unsigned int blocks,
721 bool enable)
722{
723 unsigned int mask = 0;
724
725 if (blocks & STMPE_BLOCK_GPIO)
726 mask |= STMPE1601_SYS_CTRL_ENABLE_GPIO;
727 else
728 mask &= ~STMPE1601_SYS_CTRL_ENABLE_GPIO;
729
730 if (blocks & STMPE_BLOCK_KEYPAD)
731 mask |= STMPE1601_SYS_CTRL_ENABLE_KPC;
732 else
733 mask &= ~STMPE1601_SYS_CTRL_ENABLE_KPC;
734
735 if (blocks & STMPE_BLOCK_PWM)
736 mask |= STMPE1601_SYS_CTRL_ENABLE_SPWM;
737 else
738 mask &= ~STMPE1601_SYS_CTRL_ENABLE_SPWM;
739
740 return __stmpe_set_bits(stmpe, stmpe->regs[STMPE_IDX_SYS_CTRL], mask,
741 enable ? mask : 0);
742}
743
744static int stmpe1601_get_altfunc(struct stmpe *stmpe, enum stmpe_block block)
745{
746 switch (block) {
747 case STMPE_BLOCK_PWM:
748 return 2;
749
750 case STMPE_BLOCK_KEYPAD:
751 return 1;
752
753 case STMPE_BLOCK_GPIO:
754 default:
755 return 0;
756 }
757}
758
759static struct stmpe_variant_info stmpe1601 = {
760 .name = "stmpe1601",
761 .id_val = 0x0210,
762 .id_mask = 0xfff0, /* at least 0x0210 and 0x0212 */
763 .num_gpios = 16,
764 .af_bits = 2,
765 .regs = stmpe1601_regs,
766 .blocks = stmpe1601_blocks,
767 .num_blocks = ARRAY_SIZE(stmpe1601_blocks),
768 .num_irqs = STMPE1601_NR_INTERNAL_IRQS,
769 .enable = stmpe1601_enable,
770 .get_altfunc = stmpe1601_get_altfunc,
771 .enable_autosleep = stmpe1601_autosleep,
772};
773
774/*
775 * STMPE1801
776 */
777static const u8 stmpe1801_regs[] = {
778 [STMPE_IDX_CHIP_ID] = STMPE1801_REG_CHIP_ID,
779 [STMPE_IDX_SYS_CTRL] = STMPE1801_REG_SYS_CTRL,
780 [STMPE_IDX_ICR_LSB] = STMPE1801_REG_INT_CTRL_LOW,
781 [STMPE_IDX_IER_LSB] = STMPE1801_REG_INT_EN_MASK_LOW,
782 [STMPE_IDX_ISR_LSB] = STMPE1801_REG_INT_STA_LOW,
783 [STMPE_IDX_GPMR_LSB] = STMPE1801_REG_GPIO_MP_LOW,
784 [STMPE_IDX_GPMR_CSB] = STMPE1801_REG_GPIO_MP_MID,
785 [STMPE_IDX_GPMR_MSB] = STMPE1801_REG_GPIO_MP_HIGH,
786 [STMPE_IDX_GPSR_LSB] = STMPE1801_REG_GPIO_SET_LOW,
787 [STMPE_IDX_GPSR_CSB] = STMPE1801_REG_GPIO_SET_MID,
788 [STMPE_IDX_GPSR_MSB] = STMPE1801_REG_GPIO_SET_HIGH,
789 [STMPE_IDX_GPCR_LSB] = STMPE1801_REG_GPIO_CLR_LOW,
790 [STMPE_IDX_GPCR_CSB] = STMPE1801_REG_GPIO_CLR_MID,
791 [STMPE_IDX_GPCR_MSB] = STMPE1801_REG_GPIO_CLR_HIGH,
792 [STMPE_IDX_GPDR_LSB] = STMPE1801_REG_GPIO_SET_DIR_LOW,
793 [STMPE_IDX_GPDR_CSB] = STMPE1801_REG_GPIO_SET_DIR_MID,
794 [STMPE_IDX_GPDR_MSB] = STMPE1801_REG_GPIO_SET_DIR_HIGH,
795 [STMPE_IDX_GPRER_LSB] = STMPE1801_REG_GPIO_RE_LOW,
796 [STMPE_IDX_GPRER_CSB] = STMPE1801_REG_GPIO_RE_MID,
797 [STMPE_IDX_GPRER_MSB] = STMPE1801_REG_GPIO_RE_HIGH,
798 [STMPE_IDX_GPFER_LSB] = STMPE1801_REG_GPIO_FE_LOW,
799 [STMPE_IDX_GPFER_CSB] = STMPE1801_REG_GPIO_FE_MID,
800 [STMPE_IDX_GPFER_MSB] = STMPE1801_REG_GPIO_FE_HIGH,
801 [STMPE_IDX_GPPUR_LSB] = STMPE1801_REG_GPIO_PULL_UP_LOW,
802 [STMPE_IDX_IEGPIOR_LSB] = STMPE1801_REG_INT_EN_GPIO_MASK_LOW,
803 [STMPE_IDX_IEGPIOR_CSB] = STMPE1801_REG_INT_EN_GPIO_MASK_MID,
804 [STMPE_IDX_IEGPIOR_MSB] = STMPE1801_REG_INT_EN_GPIO_MASK_HIGH,
805 [STMPE_IDX_ISGPIOR_MSB] = STMPE1801_REG_INT_STA_GPIO_HIGH,
806};
807
808static struct stmpe_variant_block stmpe1801_blocks[] = {
809 {
810 .cell = &stmpe_gpio_cell,
811 .irq = STMPE1801_IRQ_GPIOC,
812 .block = STMPE_BLOCK_GPIO,
813 },
814 {
815 .cell = &stmpe_keypad_cell,
816 .irq = STMPE1801_IRQ_KEYPAD,
817 .block = STMPE_BLOCK_KEYPAD,
818 },
819};
820
821static int stmpe1801_enable(struct stmpe *stmpe, unsigned int blocks,
822 bool enable)
823{
824 unsigned int mask = 0;
825 if (blocks & STMPE_BLOCK_GPIO)
826 mask |= STMPE1801_MSK_INT_EN_GPIO;
827
828 if (blocks & STMPE_BLOCK_KEYPAD)
829 mask |= STMPE1801_MSK_INT_EN_KPC;
830
831 return __stmpe_set_bits(stmpe, STMPE1801_REG_INT_EN_MASK_LOW, mask,
832 enable ? mask : 0);
833}
834
835static int stmpe_reset(struct stmpe *stmpe)
836{
837 u16 id_val = stmpe->variant->id_val;
838 unsigned long timeout;
839 int ret = 0;
840 u8 reset_bit;
841
842 if (id_val == STMPE811_ID)
843 /* STMPE801 and STMPE610 use bit 1 of SYS_CTRL register */
844 reset_bit = STMPE811_SYS_CTRL_RESET;
845 else
846 /* all other STMPE variant use bit 7 of SYS_CTRL register */
847 reset_bit = STMPE_SYS_CTRL_RESET;
848
849 ret = __stmpe_set_bits(stmpe, stmpe->regs[STMPE_IDX_SYS_CTRL],
850 reset_bit, reset_bit);
851 if (ret < 0)
852 return ret;
853
854 msleep(10);
855
856 timeout = jiffies + msecs_to_jiffies(100);
857 while (time_before(jiffies, timeout)) {
858 ret = __stmpe_reg_read(stmpe, stmpe->regs[STMPE_IDX_SYS_CTRL]);
859 if (ret < 0)
860 return ret;
861 if (!(ret & reset_bit))
862 return 0;
863 usleep_range(100, 200);
864 }
865 return -EIO;
866}
867
868static struct stmpe_variant_info stmpe1801 = {
869 .name = "stmpe1801",
870 .id_val = STMPE1801_ID,
871 .id_mask = 0xfff0,
872 .num_gpios = 18,
873 .af_bits = 0,
874 .regs = stmpe1801_regs,
875 .blocks = stmpe1801_blocks,
876 .num_blocks = ARRAY_SIZE(stmpe1801_blocks),
877 .num_irqs = STMPE1801_NR_INTERNAL_IRQS,
878 .enable = stmpe1801_enable,
879 /* stmpe1801 do not have any gpio alternate function */
880 .get_altfunc = NULL,
881};
882
883/*
884 * STMPE24XX
885 */
886
887static const u8 stmpe24xx_regs[] = {
888 [STMPE_IDX_CHIP_ID] = STMPE24XX_REG_CHIP_ID,
889 [STMPE_IDX_SYS_CTRL] = STMPE24XX_REG_SYS_CTRL,
890 [STMPE_IDX_SYS_CTRL2] = STMPE24XX_REG_SYS_CTRL2,
891 [STMPE_IDX_ICR_LSB] = STMPE24XX_REG_ICR_LSB,
892 [STMPE_IDX_IER_MSB] = STMPE24XX_REG_IER_MSB,
893 [STMPE_IDX_IER_LSB] = STMPE24XX_REG_IER_LSB,
894 [STMPE_IDX_ISR_MSB] = STMPE24XX_REG_ISR_MSB,
895 [STMPE_IDX_GPMR_LSB] = STMPE24XX_REG_GPMR_LSB,
896 [STMPE_IDX_GPMR_CSB] = STMPE24XX_REG_GPMR_CSB,
897 [STMPE_IDX_GPMR_MSB] = STMPE24XX_REG_GPMR_MSB,
898 [STMPE_IDX_GPSR_LSB] = STMPE24XX_REG_GPSR_LSB,
899 [STMPE_IDX_GPSR_CSB] = STMPE24XX_REG_GPSR_CSB,
900 [STMPE_IDX_GPSR_MSB] = STMPE24XX_REG_GPSR_MSB,
901 [STMPE_IDX_GPCR_LSB] = STMPE24XX_REG_GPCR_LSB,
902 [STMPE_IDX_GPCR_CSB] = STMPE24XX_REG_GPCR_CSB,
903 [STMPE_IDX_GPCR_MSB] = STMPE24XX_REG_GPCR_MSB,
904 [STMPE_IDX_GPDR_LSB] = STMPE24XX_REG_GPDR_LSB,
905 [STMPE_IDX_GPDR_CSB] = STMPE24XX_REG_GPDR_CSB,
906 [STMPE_IDX_GPDR_MSB] = STMPE24XX_REG_GPDR_MSB,
907 [STMPE_IDX_GPRER_LSB] = STMPE24XX_REG_GPRER_LSB,
908 [STMPE_IDX_GPRER_CSB] = STMPE24XX_REG_GPRER_CSB,
909 [STMPE_IDX_GPRER_MSB] = STMPE24XX_REG_GPRER_MSB,
910 [STMPE_IDX_GPFER_LSB] = STMPE24XX_REG_GPFER_LSB,
911 [STMPE_IDX_GPFER_CSB] = STMPE24XX_REG_GPFER_CSB,
912 [STMPE_IDX_GPFER_MSB] = STMPE24XX_REG_GPFER_MSB,
913 [STMPE_IDX_GPPUR_LSB] = STMPE24XX_REG_GPPUR_LSB,
914 [STMPE_IDX_GPPDR_LSB] = STMPE24XX_REG_GPPDR_LSB,
915 [STMPE_IDX_GPAFR_U_MSB] = STMPE24XX_REG_GPAFR_U_MSB,
916 [STMPE_IDX_IEGPIOR_LSB] = STMPE24XX_REG_IEGPIOR_LSB,
917 [STMPE_IDX_IEGPIOR_CSB] = STMPE24XX_REG_IEGPIOR_CSB,
918 [STMPE_IDX_IEGPIOR_MSB] = STMPE24XX_REG_IEGPIOR_MSB,
919 [STMPE_IDX_ISGPIOR_MSB] = STMPE24XX_REG_ISGPIOR_MSB,
920 [STMPE_IDX_GPEDR_LSB] = STMPE24XX_REG_GPEDR_LSB,
921 [STMPE_IDX_GPEDR_CSB] = STMPE24XX_REG_GPEDR_CSB,
922 [STMPE_IDX_GPEDR_MSB] = STMPE24XX_REG_GPEDR_MSB,
923};
924
925static struct stmpe_variant_block stmpe24xx_blocks[] = {
926 {
927 .cell = &stmpe_gpio_cell,
928 .irq = STMPE24XX_IRQ_GPIOC,
929 .block = STMPE_BLOCK_GPIO,
930 },
931 {
932 .cell = &stmpe_keypad_cell,
933 .irq = STMPE24XX_IRQ_KEYPAD,
934 .block = STMPE_BLOCK_KEYPAD,
935 },
936 {
937 .cell = &stmpe_pwm_cell,
938 .irq = STMPE24XX_IRQ_PWM0,
939 .block = STMPE_BLOCK_PWM,
940 },
941};
942
943static int stmpe24xx_enable(struct stmpe *stmpe, unsigned int blocks,
944 bool enable)
945{
946 unsigned int mask = 0;
947
948 if (blocks & STMPE_BLOCK_GPIO)
949 mask |= STMPE24XX_SYS_CTRL_ENABLE_GPIO;
950
951 if (blocks & STMPE_BLOCK_KEYPAD)
952 mask |= STMPE24XX_SYS_CTRL_ENABLE_KPC;
953
954 return __stmpe_set_bits(stmpe, stmpe->regs[STMPE_IDX_SYS_CTRL], mask,
955 enable ? mask : 0);
956}
957
958static int stmpe24xx_get_altfunc(struct stmpe *stmpe, enum stmpe_block block)
959{
960 switch (block) {
961 case STMPE_BLOCK_ROTATOR:
962 return 2;
963
964 case STMPE_BLOCK_KEYPAD:
965 case STMPE_BLOCK_PWM:
966 return 1;
967
968 case STMPE_BLOCK_GPIO:
969 default:
970 return 0;
971 }
972}
973
974static struct stmpe_variant_info stmpe2401 = {
975 .name = "stmpe2401",
976 .id_val = 0x0101,
977 .id_mask = 0xffff,
978 .num_gpios = 24,
979 .af_bits = 2,
980 .regs = stmpe24xx_regs,
981 .blocks = stmpe24xx_blocks,
982 .num_blocks = ARRAY_SIZE(stmpe24xx_blocks),
983 .num_irqs = STMPE24XX_NR_INTERNAL_IRQS,
984 .enable = stmpe24xx_enable,
985 .get_altfunc = stmpe24xx_get_altfunc,
986};
987
988static struct stmpe_variant_info stmpe2403 = {
989 .name = "stmpe2403",
990 .id_val = 0x0120,
991 .id_mask = 0xffff,
992 .num_gpios = 24,
993 .af_bits = 2,
994 .regs = stmpe24xx_regs,
995 .blocks = stmpe24xx_blocks,
996 .num_blocks = ARRAY_SIZE(stmpe24xx_blocks),
997 .num_irqs = STMPE24XX_NR_INTERNAL_IRQS,
998 .enable = stmpe24xx_enable,
999 .get_altfunc = stmpe24xx_get_altfunc,
1000 .enable_autosleep = stmpe1601_autosleep, /* same as stmpe1601 */
1001};
1002
1003static struct stmpe_variant_info *stmpe_variant_info[STMPE_NBR_PARTS] = {
1004 [STMPE610] = &stmpe610,
1005 [STMPE801] = &stmpe801,
1006 [STMPE811] = &stmpe811,
1007 [STMPE1600] = &stmpe1600,
1008 [STMPE1601] = &stmpe1601,
1009 [STMPE1801] = &stmpe1801,
1010 [STMPE2401] = &stmpe2401,
1011 [STMPE2403] = &stmpe2403,
1012};
1013
1014/*
1015 * These devices can be connected in a 'no-irq' configuration - the irq pin
1016 * is not used and the device cannot interrupt the CPU. Here we only list
1017 * devices which support this configuration - the driver will fail probing
1018 * for any devices not listed here which are configured in this way.
1019 */
1020static struct stmpe_variant_info *stmpe_noirq_variant_info[STMPE_NBR_PARTS] = {
1021 [STMPE801] = &stmpe801_noirq,
1022};
1023
1024static irqreturn_t stmpe_irq(int irq, void *data)
1025{
1026 struct stmpe *stmpe = data;
1027 struct stmpe_variant_info *variant = stmpe->variant;
1028 int num = DIV_ROUND_UP(variant->num_irqs, 8);
1029 u8 israddr;
1030 u8 isr[3];
1031 int ret;
1032 int i;
1033
1034 if (variant->id_val == STMPE801_ID ||
1035 variant->id_val == STMPE1600_ID) {
1036 int base = irq_create_mapping(stmpe->domain, 0);
1037
1038 handle_nested_irq(base);
1039 return IRQ_HANDLED;
1040 }
1041
1042 if (variant->id_val == STMPE1801_ID)
1043 israddr = stmpe->regs[STMPE_IDX_ISR_LSB];
1044 else
1045 israddr = stmpe->regs[STMPE_IDX_ISR_MSB];
1046
1047 ret = stmpe_block_read(stmpe, israddr, num, isr);
1048 if (ret < 0)
1049 return IRQ_NONE;
1050
1051 for (i = 0; i < num; i++) {
1052 int bank = num - i - 1;
1053 u8 status = isr[i];
1054 u8 clear;
1055
1056 status &= stmpe->ier[bank];
1057 if (!status)
1058 continue;
1059
1060 clear = status;
1061 while (status) {
1062 int bit = __ffs(status);
1063 int line = bank * 8 + bit;
1064 int nestedirq = irq_create_mapping(stmpe->domain, line);
1065
1066 handle_nested_irq(nestedirq);
1067 status &= ~(1 << bit);
1068 }
1069
1070 stmpe_reg_write(stmpe, israddr + i, clear);
1071 }
1072
1073 return IRQ_HANDLED;
1074}
1075
1076static void stmpe_irq_lock(struct irq_data *data)
1077{
1078 struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
1079
1080 mutex_lock(&stmpe->irq_lock);
1081}
1082
1083static void stmpe_irq_sync_unlock(struct irq_data *data)
1084{
1085 struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
1086 struct stmpe_variant_info *variant = stmpe->variant;
1087 int num = DIV_ROUND_UP(variant->num_irqs, 8);
1088 int i;
1089
1090 for (i = 0; i < num; i++) {
1091 u8 new = stmpe->ier[i];
1092 u8 old = stmpe->oldier[i];
1093
1094 if (new == old)
1095 continue;
1096
1097 stmpe->oldier[i] = new;
1098 stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_IER_LSB + i], new);
1099 }
1100
1101 mutex_unlock(&stmpe->irq_lock);
1102}
1103
1104static void stmpe_irq_mask(struct irq_data *data)
1105{
1106 struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
1107 int offset = data->hwirq;
1108 int regoffset = offset / 8;
1109 int mask = 1 << (offset % 8);
1110
1111 stmpe->ier[regoffset] &= ~mask;
1112}
1113
1114static void stmpe_irq_unmask(struct irq_data *data)
1115{
1116 struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
1117 int offset = data->hwirq;
1118 int regoffset = offset / 8;
1119 int mask = 1 << (offset % 8);
1120
1121 stmpe->ier[regoffset] |= mask;
1122}
1123
1124static struct irq_chip stmpe_irq_chip = {
1125 .name = "stmpe",
1126 .irq_bus_lock = stmpe_irq_lock,
1127 .irq_bus_sync_unlock = stmpe_irq_sync_unlock,
1128 .irq_mask = stmpe_irq_mask,
1129 .irq_unmask = stmpe_irq_unmask,
1130};
1131
1132static int stmpe_irq_map(struct irq_domain *d, unsigned int virq,
1133 irq_hw_number_t hwirq)
1134{
1135 struct stmpe *stmpe = d->host_data;
1136 struct irq_chip *chip = NULL;
1137
1138 if (stmpe->variant->id_val != STMPE801_ID)
1139 chip = &stmpe_irq_chip;
1140
1141 irq_set_chip_data(virq, stmpe);
1142 irq_set_chip_and_handler(virq, chip, handle_edge_irq);
1143 irq_set_nested_thread(virq, 1);
1144 irq_set_noprobe(virq);
1145
1146 return 0;
1147}
1148
1149static void stmpe_irq_unmap(struct irq_domain *d, unsigned int virq)
1150{
1151 irq_set_chip_and_handler(virq, NULL, NULL);
1152 irq_set_chip_data(virq, NULL);
1153}
1154
1155static const struct irq_domain_ops stmpe_irq_ops = {
1156 .map = stmpe_irq_map,
1157 .unmap = stmpe_irq_unmap,
1158 .xlate = irq_domain_xlate_twocell,
1159};
1160
1161static int stmpe_irq_init(struct stmpe *stmpe, struct device_node *np)
1162{
1163 int base = 0;
1164 int num_irqs = stmpe->variant->num_irqs;
1165
1166 stmpe->domain = irq_domain_add_simple(np, num_irqs, base,
1167 &stmpe_irq_ops, stmpe);
1168 if (!stmpe->domain) {
1169 dev_err(stmpe->dev, "Failed to create irqdomain\n");
1170 return -ENOSYS;
1171 }
1172
1173 return 0;
1174}
1175
1176static int stmpe_chip_init(struct stmpe *stmpe)
1177{
1178 unsigned int irq_trigger = stmpe->pdata->irq_trigger;
1179 int autosleep_timeout = stmpe->pdata->autosleep_timeout;
1180 struct stmpe_variant_info *variant = stmpe->variant;
1181 u8 icr = 0;
1182 unsigned int id;
1183 u8 data[2];
1184 int ret;
1185
1186 ret = stmpe_block_read(stmpe, stmpe->regs[STMPE_IDX_CHIP_ID],
1187 ARRAY_SIZE(data), data);
1188 if (ret < 0)
1189 return ret;
1190
1191 id = (data[0] << 8) | data[1];
1192 if ((id & variant->id_mask) != variant->id_val) {
1193 dev_err(stmpe->dev, "unknown chip id: %#x\n", id);
1194 return -EINVAL;
1195 }
1196
1197 dev_info(stmpe->dev, "%s detected, chip id: %#x\n", variant->name, id);
1198
1199 /* Disable all modules -- subdrivers should enable what they need. */
1200 ret = stmpe_disable(stmpe, ~0);
1201 if (ret)
1202 return ret;
1203
1204 ret = stmpe_reset(stmpe);
1205 if (ret < 0)
1206 return ret;
1207
1208 if (stmpe->irq >= 0) {
1209 if (id == STMPE801_ID || id == STMPE1600_ID)
1210 icr = STMPE_SYS_CTRL_INT_EN;
1211 else
1212 icr = STMPE_ICR_LSB_GIM;
1213
1214 /* STMPE801 and STMPE1600 don't support Edge interrupts */
1215 if (id != STMPE801_ID && id != STMPE1600_ID) {
1216 if (irq_trigger == IRQF_TRIGGER_FALLING ||
1217 irq_trigger == IRQF_TRIGGER_RISING)
1218 icr |= STMPE_ICR_LSB_EDGE;
1219 }
1220
1221 if (irq_trigger == IRQF_TRIGGER_RISING ||
1222 irq_trigger == IRQF_TRIGGER_HIGH) {
1223 if (id == STMPE801_ID || id == STMPE1600_ID)
1224 icr |= STMPE_SYS_CTRL_INT_HI;
1225 else
1226 icr |= STMPE_ICR_LSB_HIGH;
1227 }
1228 }
1229
1230 if (stmpe->pdata->autosleep) {
1231 ret = stmpe_autosleep(stmpe, autosleep_timeout);
1232 if (ret)
1233 return ret;
1234 }
1235
1236 return stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_ICR_LSB], icr);
1237}
1238
1239static int stmpe_add_device(struct stmpe *stmpe, const struct mfd_cell *cell)
1240{
1241 return mfd_add_devices(stmpe->dev, stmpe->pdata->id, cell, 1,
1242 NULL, 0, stmpe->domain);
1243}
1244
1245static int stmpe_devices_init(struct stmpe *stmpe)
1246{
1247 struct stmpe_variant_info *variant = stmpe->variant;
1248 unsigned int platform_blocks = stmpe->pdata->blocks;
1249 int ret = -EINVAL;
1250 int i, j;
1251
1252 for (i = 0; i < variant->num_blocks; i++) {
1253 struct stmpe_variant_block *block = &variant->blocks[i];
1254
1255 if (!(platform_blocks & block->block))
1256 continue;
1257
1258 for (j = 0; j < block->cell->num_resources; j++) {
1259 struct resource *res =
1260 (struct resource *) &block->cell->resources[j];
1261
1262 /* Dynamically fill in a variant's IRQ. */
1263 if (res->flags & IORESOURCE_IRQ)
1264 res->start = res->end = block->irq + j;
1265 }
1266
1267 platform_blocks &= ~block->block;
1268 ret = stmpe_add_device(stmpe, block->cell);
1269 if (ret)
1270 return ret;
1271 }
1272
1273 if (platform_blocks)
1274 dev_warn(stmpe->dev,
1275 "platform wants blocks (%#x) not present on variant",
1276 platform_blocks);
1277
1278 return ret;
1279}
1280
1281static void stmpe_of_probe(struct stmpe_platform_data *pdata,
1282 struct device_node *np)
1283{
1284 struct device_node *child;
1285
1286 pdata->id = of_alias_get_id(np, "stmpe-i2c");
1287 if (pdata->id < 0)
1288 pdata->id = -1;
1289
1290 pdata->irq_gpio = of_get_named_gpio_flags(np, "irq-gpio", 0,
1291 &pdata->irq_trigger);
1292 if (gpio_is_valid(pdata->irq_gpio))
1293 pdata->irq_over_gpio = 1;
1294 else
1295 pdata->irq_trigger = IRQF_TRIGGER_NONE;
1296
1297 of_property_read_u32(np, "st,autosleep-timeout",
1298 &pdata->autosleep_timeout);
1299
1300 pdata->autosleep = (pdata->autosleep_timeout) ? true : false;
1301
1302 for_each_child_of_node(np, child) {
1303 if (!strcmp(child->name, "stmpe_gpio")) {
1304 pdata->blocks |= STMPE_BLOCK_GPIO;
1305 } else if (!strcmp(child->name, "stmpe_keypad")) {
1306 pdata->blocks |= STMPE_BLOCK_KEYPAD;
1307 } else if (!strcmp(child->name, "stmpe_touchscreen")) {
1308 pdata->blocks |= STMPE_BLOCK_TOUCHSCREEN;
1309 } else if (!strcmp(child->name, "stmpe_adc")) {
1310 pdata->blocks |= STMPE_BLOCK_ADC;
1311 } else if (!strcmp(child->name, "stmpe_pwm")) {
1312 pdata->blocks |= STMPE_BLOCK_PWM;
1313 } else if (!strcmp(child->name, "stmpe_rotator")) {
1314 pdata->blocks |= STMPE_BLOCK_ROTATOR;
1315 }
1316 }
1317}
1318
1319/* Called from client specific probe routines */
1320int stmpe_probe(struct stmpe_client_info *ci, enum stmpe_partnum partnum)
1321{
1322 struct stmpe_platform_data *pdata;
1323 struct device_node *np = ci->dev->of_node;
1324 struct stmpe *stmpe;
1325 int ret;
1326
1327 pdata = devm_kzalloc(ci->dev, sizeof(*pdata), GFP_KERNEL);
1328 if (!pdata)
1329 return -ENOMEM;
1330
1331 stmpe_of_probe(pdata, np);
1332
1333 if (of_find_property(np, "interrupts", NULL) == NULL)
1334 ci->irq = -1;
1335
1336 stmpe = devm_kzalloc(ci->dev, sizeof(struct stmpe), GFP_KERNEL);
1337 if (!stmpe)
1338 return -ENOMEM;
1339
1340 mutex_init(&stmpe->irq_lock);
1341 mutex_init(&stmpe->lock);
1342
1343 stmpe->dev = ci->dev;
1344 stmpe->client = ci->client;
1345 stmpe->pdata = pdata;
1346 stmpe->ci = ci;
1347 stmpe->partnum = partnum;
1348 stmpe->variant = stmpe_variant_info[partnum];
1349 stmpe->regs = stmpe->variant->regs;
1350 stmpe->num_gpios = stmpe->variant->num_gpios;
1351 stmpe->vcc = devm_regulator_get_optional(ci->dev, "vcc");
1352 if (!IS_ERR(stmpe->vcc)) {
1353 ret = regulator_enable(stmpe->vcc);
1354 if (ret)
1355 dev_warn(ci->dev, "failed to enable VCC supply\n");
1356 }
1357 stmpe->vio = devm_regulator_get_optional(ci->dev, "vio");
1358 if (!IS_ERR(stmpe->vio)) {
1359 ret = regulator_enable(stmpe->vio);
1360 if (ret)
1361 dev_warn(ci->dev, "failed to enable VIO supply\n");
1362 }
1363 dev_set_drvdata(stmpe->dev, stmpe);
1364
1365 if (ci->init)
1366 ci->init(stmpe);
1367
1368 if (pdata->irq_over_gpio) {
1369 ret = devm_gpio_request_one(ci->dev, pdata->irq_gpio,
1370 GPIOF_DIR_IN, "stmpe");
1371 if (ret) {
1372 dev_err(stmpe->dev, "failed to request IRQ GPIO: %d\n",
1373 ret);
1374 return ret;
1375 }
1376
1377 stmpe->irq = gpio_to_irq(pdata->irq_gpio);
1378 } else {
1379 stmpe->irq = ci->irq;
1380 }
1381
1382 if (stmpe->irq < 0) {
1383 /* use alternate variant info for no-irq mode, if supported */
1384 dev_info(stmpe->dev,
1385 "%s configured in no-irq mode by platform data\n",
1386 stmpe->variant->name);
1387 if (!stmpe_noirq_variant_info[stmpe->partnum]) {
1388 dev_err(stmpe->dev,
1389 "%s does not support no-irq mode!\n",
1390 stmpe->variant->name);
1391 return -ENODEV;
1392 }
1393 stmpe->variant = stmpe_noirq_variant_info[stmpe->partnum];
1394 } else if (pdata->irq_trigger == IRQF_TRIGGER_NONE) {
1395 pdata->irq_trigger = irq_get_trigger_type(stmpe->irq);
1396 }
1397
1398 ret = stmpe_chip_init(stmpe);
1399 if (ret)
1400 return ret;
1401
1402 if (stmpe->irq >= 0) {
1403 ret = stmpe_irq_init(stmpe, np);
1404 if (ret)
1405 return ret;
1406
1407 ret = devm_request_threaded_irq(ci->dev, stmpe->irq, NULL,
1408 stmpe_irq, pdata->irq_trigger | IRQF_ONESHOT,
1409 "stmpe", stmpe);
1410 if (ret) {
1411 dev_err(stmpe->dev, "failed to request IRQ: %d\n",
1412 ret);
1413 return ret;
1414 }
1415 }
1416
1417 ret = stmpe_devices_init(stmpe);
1418 if (!ret)
1419 return 0;
1420
1421 dev_err(stmpe->dev, "failed to add children\n");
1422 mfd_remove_devices(stmpe->dev);
1423
1424 return ret;
1425}
1426
1427int stmpe_remove(struct stmpe *stmpe)
1428{
1429 if (!IS_ERR(stmpe->vio))
1430 regulator_disable(stmpe->vio);
1431 if (!IS_ERR(stmpe->vcc))
1432 regulator_disable(stmpe->vcc);
1433
1434 mfd_remove_devices(stmpe->dev);
1435
1436 return 0;
1437}
1438
1439#ifdef CONFIG_PM
1440static int stmpe_suspend(struct device *dev)
1441{
1442 struct stmpe *stmpe = dev_get_drvdata(dev);
1443
1444 if (stmpe->irq >= 0 && device_may_wakeup(dev))
1445 enable_irq_wake(stmpe->irq);
1446
1447 return 0;
1448}
1449
1450static int stmpe_resume(struct device *dev)
1451{
1452 struct stmpe *stmpe = dev_get_drvdata(dev);
1453
1454 if (stmpe->irq >= 0 && device_may_wakeup(dev))
1455 disable_irq_wake(stmpe->irq);
1456
1457 return 0;
1458}
1459
1460const struct dev_pm_ops stmpe_dev_pm_ops = {
1461 .suspend = stmpe_suspend,
1462 .resume = stmpe_resume,
1463};
1464#endif