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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 "stmpe.h"
23
24 static int __stmpe_enable(struct stmpe *stmpe, unsigned int blocks)
25 {
26         return stmpe->variant->enable(stmpe, blocks, true);
27 }
28
29 static int __stmpe_disable(struct stmpe *stmpe, unsigned int blocks)
30 {
31         return stmpe->variant->enable(stmpe, blocks, false);
32 }
33
34 static int __stmpe_reg_read(struct stmpe *stmpe, u8 reg)
35 {
36         int ret;
37
38         ret = stmpe->ci->read_byte(stmpe, reg);
39         if (ret < 0)
40                 dev_err(stmpe->dev, "failed to read reg %#x: %d\n", reg, ret);
41
42         dev_vdbg(stmpe->dev, "rd: reg %#x => data %#x\n", reg, ret);
43
44         return ret;
45 }
46
47 static int __stmpe_reg_write(struct stmpe *stmpe, u8 reg, u8 val)
48 {
49         int ret;
50
51         dev_vdbg(stmpe->dev, "wr: reg %#x <= %#x\n", reg, val);
52
53         ret = stmpe->ci->write_byte(stmpe, reg, val);
54         if (ret < 0)
55                 dev_err(stmpe->dev, "failed to write reg %#x: %d\n", reg, ret);
56
57         return ret;
58 }
59
60 static int __stmpe_set_bits(struct stmpe *stmpe, u8 reg, u8 mask, u8 val)
61 {
62         int ret;
63
64         ret = __stmpe_reg_read(stmpe, reg);
65         if (ret < 0)
66                 return ret;
67
68         ret &= ~mask;
69         ret |= val;
70
71         return __stmpe_reg_write(stmpe, reg, ret);
72 }
73
74 static int __stmpe_block_read(struct stmpe *stmpe, u8 reg, u8 length,
75                               u8 *values)
76 {
77         int ret;
78
79         ret = stmpe->ci->read_block(stmpe, reg, length, values);
80         if (ret < 0)
81                 dev_err(stmpe->dev, "failed to read regs %#x: %d\n", reg, ret);
82
83         dev_vdbg(stmpe->dev, "rd: reg %#x (%d) => ret %#x\n", reg, length, ret);
84         stmpe_dump_bytes("stmpe rd: ", values, length);
85
86         return ret;
87 }
88
89 static int __stmpe_block_write(struct stmpe *stmpe, u8 reg, u8 length,
90                         const u8 *values)
91 {
92         int ret;
93
94         dev_vdbg(stmpe->dev, "wr: regs %#x (%d)\n", reg, length);
95         stmpe_dump_bytes("stmpe wr: ", values, length);
96
97         ret = stmpe->ci->write_block(stmpe, reg, length, values);
98         if (ret < 0)
99                 dev_err(stmpe->dev, "failed to write regs %#x: %d\n", reg, ret);
100
101         return ret;
102 }
103
104 /**
105  * stmpe_enable - enable blocks on an STMPE device
106  * @stmpe:      Device to work on
107  * @blocks:     Mask of blocks (enum stmpe_block values) to enable
108  */
109 int stmpe_enable(struct stmpe *stmpe, unsigned int blocks)
110 {
111         int ret;
112
113         mutex_lock(&stmpe->lock);
114         ret = __stmpe_enable(stmpe, blocks);
115         mutex_unlock(&stmpe->lock);
116
117         return ret;
118 }
119 EXPORT_SYMBOL_GPL(stmpe_enable);
120
121 /**
122  * stmpe_disable - disable blocks on an STMPE device
123  * @stmpe:      Device to work on
124  * @blocks:     Mask of blocks (enum stmpe_block values) to enable
125  */
126 int stmpe_disable(struct stmpe *stmpe, unsigned int blocks)
127 {
128         int ret;
129
130         mutex_lock(&stmpe->lock);
131         ret = __stmpe_disable(stmpe, blocks);
132         mutex_unlock(&stmpe->lock);
133
134         return ret;
135 }
136 EXPORT_SYMBOL_GPL(stmpe_disable);
137
138 /**
139  * stmpe_reg_read() - read a single STMPE register
140  * @stmpe:      Device to read from
141  * @reg:        Register to read
142  */
143 int stmpe_reg_read(struct stmpe *stmpe, u8 reg)
144 {
145         int ret;
146
147         mutex_lock(&stmpe->lock);
148         ret = __stmpe_reg_read(stmpe, reg);
149         mutex_unlock(&stmpe->lock);
150
151         return ret;
152 }
153 EXPORT_SYMBOL_GPL(stmpe_reg_read);
154
155 /**
156  * stmpe_reg_write() - write a single STMPE register
157  * @stmpe:      Device to write to
158  * @reg:        Register to write
159  * @val:        Value to write
160  */
161 int stmpe_reg_write(struct stmpe *stmpe, u8 reg, u8 val)
162 {
163         int ret;
164
165         mutex_lock(&stmpe->lock);
166         ret = __stmpe_reg_write(stmpe, reg, val);
167         mutex_unlock(&stmpe->lock);
168
169         return ret;
170 }
171 EXPORT_SYMBOL_GPL(stmpe_reg_write);
172
173 /**
174  * stmpe_set_bits() - set the value of a bitfield in a STMPE register
175  * @stmpe:      Device to write to
176  * @reg:        Register to write
177  * @mask:       Mask of bits to set
178  * @val:        Value to set
179  */
180 int stmpe_set_bits(struct stmpe *stmpe, u8 reg, u8 mask, u8 val)
181 {
182         int ret;
183
184         mutex_lock(&stmpe->lock);
185         ret = __stmpe_set_bits(stmpe, reg, mask, val);
186         mutex_unlock(&stmpe->lock);
187
188         return ret;
189 }
190 EXPORT_SYMBOL_GPL(stmpe_set_bits);
191
192 /**
193  * stmpe_block_read() - read multiple STMPE registers
194  * @stmpe:      Device to read from
195  * @reg:        First register
196  * @length:     Number of registers
197  * @values:     Buffer to write to
198  */
199 int stmpe_block_read(struct stmpe *stmpe, u8 reg, u8 length, u8 *values)
200 {
201         int ret;
202
203         mutex_lock(&stmpe->lock);
204         ret = __stmpe_block_read(stmpe, reg, length, values);
205         mutex_unlock(&stmpe->lock);
206
207         return ret;
208 }
209 EXPORT_SYMBOL_GPL(stmpe_block_read);
210
211 /**
212  * stmpe_block_write() - write multiple STMPE registers
213  * @stmpe:      Device to write to
214  * @reg:        First register
215  * @length:     Number of registers
216  * @values:     Values to write
217  */
218 int stmpe_block_write(struct stmpe *stmpe, u8 reg, u8 length,
219                       const u8 *values)
220 {
221         int ret;
222
223         mutex_lock(&stmpe->lock);
224         ret = __stmpe_block_write(stmpe, reg, length, values);
225         mutex_unlock(&stmpe->lock);
226
227         return ret;
228 }
229 EXPORT_SYMBOL_GPL(stmpe_block_write);
230
231 /**
232  * stmpe_set_altfunc()- set the alternate function for STMPE pins
233  * @stmpe:      Device to configure
234  * @pins:       Bitmask of pins to affect
235  * @block:      block to enable alternate functions for
236  *
237  * @pins is assumed to have a bit set for each of the bits whose alternate
238  * function is to be changed, numbered according to the GPIOXY numbers.
239  *
240  * If the GPIO module is not enabled, this function automatically enables it in
241  * order to perform the change.
242  */
243 int stmpe_set_altfunc(struct stmpe *stmpe, u32 pins, enum stmpe_block block)
244 {
245         struct stmpe_variant_info *variant = stmpe->variant;
246         u8 regaddr = stmpe->regs[STMPE_IDX_GPAFR_U_MSB];
247         int af_bits = variant->af_bits;
248         int numregs = DIV_ROUND_UP(stmpe->num_gpios * af_bits, 8);
249         int mask = (1 << af_bits) - 1;
250         u8 regs[numregs];
251         int af, afperreg, ret;
252
253         if (!variant->get_altfunc)
254                 return 0;
255
256         afperreg = 8 / af_bits;
257         mutex_lock(&stmpe->lock);
258
259         ret = __stmpe_enable(stmpe, STMPE_BLOCK_GPIO);
260         if (ret < 0)
261                 goto out;
262
263         ret = __stmpe_block_read(stmpe, regaddr, numregs, regs);
264         if (ret < 0)
265                 goto out;
266
267         af = variant->get_altfunc(stmpe, block);
268
269         while (pins) {
270                 int pin = __ffs(pins);
271                 int regoffset = numregs - (pin / afperreg) - 1;
272                 int pos = (pin % afperreg) * (8 / afperreg);
273
274                 regs[regoffset] &= ~(mask << pos);
275                 regs[regoffset] |= af << pos;
276
277                 pins &= ~(1 << pin);
278         }
279
280         ret = __stmpe_block_write(stmpe, regaddr, numregs, regs);
281
282 out:
283         mutex_unlock(&stmpe->lock);
284         return ret;
285 }
286 EXPORT_SYMBOL_GPL(stmpe_set_altfunc);
287
288 /*
289  * GPIO (all variants)
290  */
291
292 static struct resource stmpe_gpio_resources[] = {
293         /* Start and end filled dynamically */
294         {
295                 .flags  = IORESOURCE_IRQ,
296         },
297 };
298
299 static struct mfd_cell stmpe_gpio_cell = {
300         .name           = "stmpe-gpio",
301         .of_compatible  = "st,stmpe-gpio",
302         .resources      = stmpe_gpio_resources,
303         .num_resources  = ARRAY_SIZE(stmpe_gpio_resources),
304 };
305
306 static struct mfd_cell stmpe_gpio_cell_noirq = {
307         .name           = "stmpe-gpio",
308         .of_compatible  = "st,stmpe-gpio",
309         /* gpio cell resources consist of an irq only so no resources here */
310 };
311
312 /*
313  * Keypad (1601, 2401, 2403)
314  */
315
316 static struct resource stmpe_keypad_resources[] = {
317         {
318                 .name   = "KEYPAD",
319                 .flags  = IORESOURCE_IRQ,
320         },
321         {
322                 .name   = "KEYPAD_OVER",
323                 .flags  = IORESOURCE_IRQ,
324         },
325 };
326
327 static struct mfd_cell stmpe_keypad_cell = {
328         .name           = "stmpe-keypad",
329         .of_compatible  = "st,stmpe-keypad",
330         .resources      = stmpe_keypad_resources,
331         .num_resources  = ARRAY_SIZE(stmpe_keypad_resources),
332 };
333
334 /*
335  * STMPE801
336  */
337 static const u8 stmpe801_regs[] = {
338         [STMPE_IDX_CHIP_ID]     = STMPE801_REG_CHIP_ID,
339         [STMPE_IDX_ICR_LSB]     = STMPE801_REG_SYS_CTRL,
340         [STMPE_IDX_GPMR_LSB]    = STMPE801_REG_GPIO_MP_STA,
341         [STMPE_IDX_GPSR_LSB]    = STMPE801_REG_GPIO_SET_PIN,
342         [STMPE_IDX_GPCR_LSB]    = STMPE801_REG_GPIO_SET_PIN,
343         [STMPE_IDX_GPDR_LSB]    = STMPE801_REG_GPIO_DIR,
344         [STMPE_IDX_IEGPIOR_LSB] = STMPE801_REG_GPIO_INT_EN,
345         [STMPE_IDX_ISGPIOR_MSB] = STMPE801_REG_GPIO_INT_STA,
346
347 };
348
349 static struct stmpe_variant_block stmpe801_blocks[] = {
350         {
351                 .cell   = &stmpe_gpio_cell,
352                 .irq    = 0,
353                 .block  = STMPE_BLOCK_GPIO,
354         },
355 };
356
357 static struct stmpe_variant_block stmpe801_blocks_noirq[] = {
358         {
359                 .cell   = &stmpe_gpio_cell_noirq,
360                 .block  = STMPE_BLOCK_GPIO,
361         },
362 };
363
364 static int stmpe801_enable(struct stmpe *stmpe, unsigned int blocks,
365                            bool enable)
366 {
367         if (blocks & STMPE_BLOCK_GPIO)
368                 return 0;
369         else
370                 return -EINVAL;
371 }
372
373 static struct stmpe_variant_info stmpe801 = {
374         .name           = "stmpe801",
375         .id_val         = STMPE801_ID,
376         .id_mask        = 0xffff,
377         .num_gpios      = 8,
378         .regs           = stmpe801_regs,
379         .blocks         = stmpe801_blocks,
380         .num_blocks     = ARRAY_SIZE(stmpe801_blocks),
381         .num_irqs       = STMPE801_NR_INTERNAL_IRQS,
382         .enable         = stmpe801_enable,
383 };
384
385 static struct stmpe_variant_info stmpe801_noirq = {
386         .name           = "stmpe801",
387         .id_val         = STMPE801_ID,
388         .id_mask        = 0xffff,
389         .num_gpios      = 8,
390         .regs           = stmpe801_regs,
391         .blocks         = stmpe801_blocks_noirq,
392         .num_blocks     = ARRAY_SIZE(stmpe801_blocks_noirq),
393         .enable         = stmpe801_enable,
394 };
395
396 /*
397  * Touchscreen (STMPE811 or STMPE610)
398  */
399
400 static struct resource stmpe_ts_resources[] = {
401         {
402                 .name   = "TOUCH_DET",
403                 .flags  = IORESOURCE_IRQ,
404         },
405         {
406                 .name   = "FIFO_TH",
407                 .flags  = IORESOURCE_IRQ,
408         },
409 };
410
411 static struct mfd_cell stmpe_ts_cell = {
412         .name           = "stmpe-ts",
413         .of_compatible  = "st,stmpe-ts",
414         .resources      = stmpe_ts_resources,
415         .num_resources  = ARRAY_SIZE(stmpe_ts_resources),
416 };
417
418 /*
419  * STMPE811 or STMPE610
420  */
421
422 static const u8 stmpe811_regs[] = {
423         [STMPE_IDX_CHIP_ID]     = STMPE811_REG_CHIP_ID,
424         [STMPE_IDX_ICR_LSB]     = STMPE811_REG_INT_CTRL,
425         [STMPE_IDX_IER_LSB]     = STMPE811_REG_INT_EN,
426         [STMPE_IDX_ISR_MSB]     = STMPE811_REG_INT_STA,
427         [STMPE_IDX_GPMR_LSB]    = STMPE811_REG_GPIO_MP_STA,
428         [STMPE_IDX_GPSR_LSB]    = STMPE811_REG_GPIO_SET_PIN,
429         [STMPE_IDX_GPCR_LSB]    = STMPE811_REG_GPIO_CLR_PIN,
430         [STMPE_IDX_GPDR_LSB]    = STMPE811_REG_GPIO_DIR,
431         [STMPE_IDX_GPRER_LSB]   = STMPE811_REG_GPIO_RE,
432         [STMPE_IDX_GPFER_LSB]   = STMPE811_REG_GPIO_FE,
433         [STMPE_IDX_GPAFR_U_MSB] = STMPE811_REG_GPIO_AF,
434         [STMPE_IDX_IEGPIOR_LSB] = STMPE811_REG_GPIO_INT_EN,
435         [STMPE_IDX_ISGPIOR_MSB] = STMPE811_REG_GPIO_INT_STA,
436         [STMPE_IDX_GPEDR_MSB]   = STMPE811_REG_GPIO_ED,
437 };
438
439 static struct stmpe_variant_block stmpe811_blocks[] = {
440         {
441                 .cell   = &stmpe_gpio_cell,
442                 .irq    = STMPE811_IRQ_GPIOC,
443                 .block  = STMPE_BLOCK_GPIO,
444         },
445         {
446                 .cell   = &stmpe_ts_cell,
447                 .irq    = STMPE811_IRQ_TOUCH_DET,
448                 .block  = STMPE_BLOCK_TOUCHSCREEN,
449         },
450 };
451
452 static int stmpe811_enable(struct stmpe *stmpe, unsigned int blocks,
453                            bool enable)
454 {
455         unsigned int mask = 0;
456
457         if (blocks & STMPE_BLOCK_GPIO)
458                 mask |= STMPE811_SYS_CTRL2_GPIO_OFF;
459
460         if (blocks & STMPE_BLOCK_ADC)
461                 mask |= STMPE811_SYS_CTRL2_ADC_OFF;
462
463         if (blocks & STMPE_BLOCK_TOUCHSCREEN)
464                 mask |= STMPE811_SYS_CTRL2_TSC_OFF;
465
466         return __stmpe_set_bits(stmpe, STMPE811_REG_SYS_CTRL2, mask,
467                                 enable ? 0 : mask);
468 }
469
470 static int stmpe811_get_altfunc(struct stmpe *stmpe, enum stmpe_block block)
471 {
472         /* 0 for touchscreen, 1 for GPIO */
473         return block != STMPE_BLOCK_TOUCHSCREEN;
474 }
475
476 static struct stmpe_variant_info stmpe811 = {
477         .name           = "stmpe811",
478         .id_val         = 0x0811,
479         .id_mask        = 0xffff,
480         .num_gpios      = 8,
481         .af_bits        = 1,
482         .regs           = stmpe811_regs,
483         .blocks         = stmpe811_blocks,
484         .num_blocks     = ARRAY_SIZE(stmpe811_blocks),
485         .num_irqs       = STMPE811_NR_INTERNAL_IRQS,
486         .enable         = stmpe811_enable,
487         .get_altfunc    = stmpe811_get_altfunc,
488 };
489
490 /* Similar to 811, except number of gpios */
491 static struct stmpe_variant_info stmpe610 = {
492         .name           = "stmpe610",
493         .id_val         = 0x0811,
494         .id_mask        = 0xffff,
495         .num_gpios      = 6,
496         .af_bits        = 1,
497         .regs           = stmpe811_regs,
498         .blocks         = stmpe811_blocks,
499         .num_blocks     = ARRAY_SIZE(stmpe811_blocks),
500         .num_irqs       = STMPE811_NR_INTERNAL_IRQS,
501         .enable         = stmpe811_enable,
502         .get_altfunc    = stmpe811_get_altfunc,
503 };
504
505 /*
506  * STMPE1601
507  */
508
509 static const u8 stmpe1601_regs[] = {
510         [STMPE_IDX_CHIP_ID]     = STMPE1601_REG_CHIP_ID,
511         [STMPE_IDX_ICR_LSB]     = STMPE1601_REG_ICR_LSB,
512         [STMPE_IDX_IER_LSB]     = STMPE1601_REG_IER_LSB,
513         [STMPE_IDX_ISR_MSB]     = STMPE1601_REG_ISR_MSB,
514         [STMPE_IDX_GPMR_LSB]    = STMPE1601_REG_GPIO_MP_LSB,
515         [STMPE_IDX_GPSR_LSB]    = STMPE1601_REG_GPIO_SET_LSB,
516         [STMPE_IDX_GPCR_LSB]    = STMPE1601_REG_GPIO_CLR_LSB,
517         [STMPE_IDX_GPDR_LSB]    = STMPE1601_REG_GPIO_SET_DIR_LSB,
518         [STMPE_IDX_GPRER_LSB]   = STMPE1601_REG_GPIO_RE_LSB,
519         [STMPE_IDX_GPFER_LSB]   = STMPE1601_REG_GPIO_FE_LSB,
520         [STMPE_IDX_GPAFR_U_MSB] = STMPE1601_REG_GPIO_AF_U_MSB,
521         [STMPE_IDX_IEGPIOR_LSB] = STMPE1601_REG_INT_EN_GPIO_MASK_LSB,
522         [STMPE_IDX_ISGPIOR_MSB] = STMPE1601_REG_INT_STA_GPIO_MSB,
523         [STMPE_IDX_GPEDR_MSB]   = STMPE1601_REG_GPIO_ED_MSB,
524 };
525
526 static struct stmpe_variant_block stmpe1601_blocks[] = {
527         {
528                 .cell   = &stmpe_gpio_cell,
529                 .irq    = STMPE1601_IRQ_GPIOC,
530                 .block  = STMPE_BLOCK_GPIO,
531         },
532         {
533                 .cell   = &stmpe_keypad_cell,
534                 .irq    = STMPE1601_IRQ_KEYPAD,
535                 .block  = STMPE_BLOCK_KEYPAD,
536         },
537 };
538
539 /* supported autosleep timeout delay (in msecs) */
540 static const int stmpe_autosleep_delay[] = {
541         4, 16, 32, 64, 128, 256, 512, 1024,
542 };
543
544 static int stmpe_round_timeout(int timeout)
545 {
546         int i;
547
548         for (i = 0; i < ARRAY_SIZE(stmpe_autosleep_delay); i++) {
549                 if (stmpe_autosleep_delay[i] >= timeout)
550                         return i;
551         }
552
553         /*
554          * requests for delays longer than supported should not return the
555          * longest supported delay
556          */
557         return -EINVAL;
558 }
559
560 static int stmpe_autosleep(struct stmpe *stmpe, int autosleep_timeout)
561 {
562         int ret;
563
564         if (!stmpe->variant->enable_autosleep)
565                 return -ENOSYS;
566
567         mutex_lock(&stmpe->lock);
568         ret = stmpe->variant->enable_autosleep(stmpe, autosleep_timeout);
569         mutex_unlock(&stmpe->lock);
570
571         return ret;
572 }
573
574 /*
575  * Both stmpe 1601/2403 support same layout for autosleep
576  */
577 static int stmpe1601_autosleep(struct stmpe *stmpe,
578                 int autosleep_timeout)
579 {
580         int ret, timeout;
581
582         /* choose the best available timeout */
583         timeout = stmpe_round_timeout(autosleep_timeout);
584         if (timeout < 0) {
585                 dev_err(stmpe->dev, "invalid timeout\n");
586                 return timeout;
587         }
588
589         ret = __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL2,
590                         STMPE1601_AUTOSLEEP_TIMEOUT_MASK,
591                         timeout);
592         if (ret < 0)
593                 return ret;
594
595         return __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL2,
596                         STPME1601_AUTOSLEEP_ENABLE,
597                         STPME1601_AUTOSLEEP_ENABLE);
598 }
599
600 static int stmpe1601_enable(struct stmpe *stmpe, unsigned int blocks,
601                             bool enable)
602 {
603         unsigned int mask = 0;
604
605         if (blocks & STMPE_BLOCK_GPIO)
606                 mask |= STMPE1601_SYS_CTRL_ENABLE_GPIO;
607
608         if (blocks & STMPE_BLOCK_KEYPAD)
609                 mask |= STMPE1601_SYS_CTRL_ENABLE_KPC;
610
611         return __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL, mask,
612                                 enable ? mask : 0);
613 }
614
615 static int stmpe1601_get_altfunc(struct stmpe *stmpe, enum stmpe_block block)
616 {
617         switch (block) {
618         case STMPE_BLOCK_PWM:
619                 return 2;
620
621         case STMPE_BLOCK_KEYPAD:
622                 return 1;
623
624         case STMPE_BLOCK_GPIO:
625         default:
626                 return 0;
627         }
628 }
629
630 static struct stmpe_variant_info stmpe1601 = {
631         .name           = "stmpe1601",
632         .id_val         = 0x0210,
633         .id_mask        = 0xfff0,       /* at least 0x0210 and 0x0212 */
634         .num_gpios      = 16,
635         .af_bits        = 2,
636         .regs           = stmpe1601_regs,
637         .blocks         = stmpe1601_blocks,
638         .num_blocks     = ARRAY_SIZE(stmpe1601_blocks),
639         .num_irqs       = STMPE1601_NR_INTERNAL_IRQS,
640         .enable         = stmpe1601_enable,
641         .get_altfunc    = stmpe1601_get_altfunc,
642         .enable_autosleep       = stmpe1601_autosleep,
643 };
644
645 /*
646  * STMPE24XX
647  */
648
649 static const u8 stmpe24xx_regs[] = {
650         [STMPE_IDX_CHIP_ID]     = STMPE24XX_REG_CHIP_ID,
651         [STMPE_IDX_ICR_LSB]     = STMPE24XX_REG_ICR_LSB,
652         [STMPE_IDX_IER_LSB]     = STMPE24XX_REG_IER_LSB,
653         [STMPE_IDX_ISR_MSB]     = STMPE24XX_REG_ISR_MSB,
654         [STMPE_IDX_GPMR_LSB]    = STMPE24XX_REG_GPMR_LSB,
655         [STMPE_IDX_GPSR_LSB]    = STMPE24XX_REG_GPSR_LSB,
656         [STMPE_IDX_GPCR_LSB]    = STMPE24XX_REG_GPCR_LSB,
657         [STMPE_IDX_GPDR_LSB]    = STMPE24XX_REG_GPDR_LSB,
658         [STMPE_IDX_GPRER_LSB]   = STMPE24XX_REG_GPRER_LSB,
659         [STMPE_IDX_GPFER_LSB]   = STMPE24XX_REG_GPFER_LSB,
660         [STMPE_IDX_GPAFR_U_MSB] = STMPE24XX_REG_GPAFR_U_MSB,
661         [STMPE_IDX_IEGPIOR_LSB] = STMPE24XX_REG_IEGPIOR_LSB,
662         [STMPE_IDX_ISGPIOR_MSB] = STMPE24XX_REG_ISGPIOR_MSB,
663         [STMPE_IDX_GPEDR_MSB]   = STMPE24XX_REG_GPEDR_MSB,
664 };
665
666 static struct stmpe_variant_block stmpe24xx_blocks[] = {
667         {
668                 .cell   = &stmpe_gpio_cell,
669                 .irq    = STMPE24XX_IRQ_GPIOC,
670                 .block  = STMPE_BLOCK_GPIO,
671         },
672         {
673                 .cell   = &stmpe_keypad_cell,
674                 .irq    = STMPE24XX_IRQ_KEYPAD,
675                 .block  = STMPE_BLOCK_KEYPAD,
676         },
677 };
678
679 static int stmpe24xx_enable(struct stmpe *stmpe, unsigned int blocks,
680                             bool enable)
681 {
682         unsigned int mask = 0;
683
684         if (blocks & STMPE_BLOCK_GPIO)
685                 mask |= STMPE24XX_SYS_CTRL_ENABLE_GPIO;
686
687         if (blocks & STMPE_BLOCK_KEYPAD)
688                 mask |= STMPE24XX_SYS_CTRL_ENABLE_KPC;
689
690         return __stmpe_set_bits(stmpe, STMPE24XX_REG_SYS_CTRL, mask,
691                                 enable ? mask : 0);
692 }
693
694 static int stmpe24xx_get_altfunc(struct stmpe *stmpe, enum stmpe_block block)
695 {
696         switch (block) {
697         case STMPE_BLOCK_ROTATOR:
698                 return 2;
699
700         case STMPE_BLOCK_KEYPAD:
701                 return 1;
702
703         case STMPE_BLOCK_GPIO:
704         default:
705                 return 0;
706         }
707 }
708
709 static struct stmpe_variant_info stmpe2401 = {
710         .name           = "stmpe2401",
711         .id_val         = 0x0101,
712         .id_mask        = 0xffff,
713         .num_gpios      = 24,
714         .af_bits        = 2,
715         .regs           = stmpe24xx_regs,
716         .blocks         = stmpe24xx_blocks,
717         .num_blocks     = ARRAY_SIZE(stmpe24xx_blocks),
718         .num_irqs       = STMPE24XX_NR_INTERNAL_IRQS,
719         .enable         = stmpe24xx_enable,
720         .get_altfunc    = stmpe24xx_get_altfunc,
721 };
722
723 static struct stmpe_variant_info stmpe2403 = {
724         .name           = "stmpe2403",
725         .id_val         = 0x0120,
726         .id_mask        = 0xffff,
727         .num_gpios      = 24,
728         .af_bits        = 2,
729         .regs           = stmpe24xx_regs,
730         .blocks         = stmpe24xx_blocks,
731         .num_blocks     = ARRAY_SIZE(stmpe24xx_blocks),
732         .num_irqs       = STMPE24XX_NR_INTERNAL_IRQS,
733         .enable         = stmpe24xx_enable,
734         .get_altfunc    = stmpe24xx_get_altfunc,
735         .enable_autosleep       = stmpe1601_autosleep, /* same as stmpe1601 */
736 };
737
738 static struct stmpe_variant_info *stmpe_variant_info[STMPE_NBR_PARTS] = {
739         [STMPE610]      = &stmpe610,
740         [STMPE801]      = &stmpe801,
741         [STMPE811]      = &stmpe811,
742         [STMPE1601]     = &stmpe1601,
743         [STMPE2401]     = &stmpe2401,
744         [STMPE2403]     = &stmpe2403,
745 };
746
747 /*
748  * These devices can be connected in a 'no-irq' configuration - the irq pin
749  * is not used and the device cannot interrupt the CPU. Here we only list
750  * devices which support this configuration - the driver will fail probing
751  * for any devices not listed here which are configured in this way.
752  */
753 static struct stmpe_variant_info *stmpe_noirq_variant_info[STMPE_NBR_PARTS] = {
754         [STMPE801]      = &stmpe801_noirq,
755 };
756
757 static irqreturn_t stmpe_irq(int irq, void *data)
758 {
759         struct stmpe *stmpe = data;
760         struct stmpe_variant_info *variant = stmpe->variant;
761         int num = DIV_ROUND_UP(variant->num_irqs, 8);
762         u8 israddr = stmpe->regs[STMPE_IDX_ISR_MSB];
763         u8 isr[num];
764         int ret;
765         int i;
766
767         if (variant->id_val == STMPE801_ID) {
768                 int base = irq_create_mapping(stmpe->domain, 0);
769
770                 handle_nested_irq(base);
771                 return IRQ_HANDLED;
772         }
773
774         ret = stmpe_block_read(stmpe, israddr, num, isr);
775         if (ret < 0)
776                 return IRQ_NONE;
777
778         for (i = 0; i < num; i++) {
779                 int bank = num - i - 1;
780                 u8 status = isr[i];
781                 u8 clear;
782
783                 status &= stmpe->ier[bank];
784                 if (!status)
785                         continue;
786
787                 clear = status;
788                 while (status) {
789                         int bit = __ffs(status);
790                         int line = bank * 8 + bit;
791                         int nestedirq = irq_create_mapping(stmpe->domain, line);
792
793                         handle_nested_irq(nestedirq);
794                         status &= ~(1 << bit);
795                 }
796
797                 stmpe_reg_write(stmpe, israddr + i, clear);
798         }
799
800         return IRQ_HANDLED;
801 }
802
803 static void stmpe_irq_lock(struct irq_data *data)
804 {
805         struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
806
807         mutex_lock(&stmpe->irq_lock);
808 }
809
810 static void stmpe_irq_sync_unlock(struct irq_data *data)
811 {
812         struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
813         struct stmpe_variant_info *variant = stmpe->variant;
814         int num = DIV_ROUND_UP(variant->num_irqs, 8);
815         int i;
816
817         for (i = 0; i < num; i++) {
818                 u8 new = stmpe->ier[i];
819                 u8 old = stmpe->oldier[i];
820
821                 if (new == old)
822                         continue;
823
824                 stmpe->oldier[i] = new;
825                 stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_IER_LSB] - i, new);
826         }
827
828         mutex_unlock(&stmpe->irq_lock);
829 }
830
831 static void stmpe_irq_mask(struct irq_data *data)
832 {
833         struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
834         int offset = data->hwirq;
835         int regoffset = offset / 8;
836         int mask = 1 << (offset % 8);
837
838         stmpe->ier[regoffset] &= ~mask;
839 }
840
841 static void stmpe_irq_unmask(struct irq_data *data)
842 {
843         struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
844         int offset = data->hwirq;
845         int regoffset = offset / 8;
846         int mask = 1 << (offset % 8);
847
848         stmpe->ier[regoffset] |= mask;
849 }
850
851 static struct irq_chip stmpe_irq_chip = {
852         .name                   = "stmpe",
853         .irq_bus_lock           = stmpe_irq_lock,
854         .irq_bus_sync_unlock    = stmpe_irq_sync_unlock,
855         .irq_mask               = stmpe_irq_mask,
856         .irq_unmask             = stmpe_irq_unmask,
857 };
858
859 static int stmpe_irq_map(struct irq_domain *d, unsigned int virq,
860                                 irq_hw_number_t hwirq)
861 {
862         struct stmpe *stmpe = d->host_data;
863         struct irq_chip *chip = NULL;
864
865         if (stmpe->variant->id_val != STMPE801_ID)
866                 chip = &stmpe_irq_chip;
867
868         irq_set_chip_data(virq, stmpe);
869         irq_set_chip_and_handler(virq, chip, handle_edge_irq);
870         irq_set_nested_thread(virq, 1);
871 #ifdef CONFIG_ARM
872         set_irq_flags(virq, IRQF_VALID);
873 #else
874         irq_set_noprobe(virq);
875 #endif
876
877         return 0;
878 }
879
880 static void stmpe_irq_unmap(struct irq_domain *d, unsigned int virq)
881 {
882 #ifdef CONFIG_ARM
883                 set_irq_flags(virq, 0);
884 #endif
885                 irq_set_chip_and_handler(virq, NULL, NULL);
886                 irq_set_chip_data(virq, NULL);
887 }
888
889 static struct irq_domain_ops stmpe_irq_ops = {
890         .map    = stmpe_irq_map,
891         .unmap  = stmpe_irq_unmap,
892         .xlate  = irq_domain_xlate_twocell,
893 };
894
895 static int __devinit stmpe_irq_init(struct stmpe *stmpe,
896                                 struct device_node *np)
897 {
898         int base = 0;
899         int num_irqs = stmpe->variant->num_irqs;
900
901         if (!np)
902                 base = stmpe->irq_base;
903
904         stmpe->domain = irq_domain_add_simple(np, num_irqs, base,
905                                               &stmpe_irq_ops, stmpe);
906         if (!stmpe->domain) {
907                 dev_err(stmpe->dev, "Failed to create irqdomain\n");
908                 return -ENOSYS;
909         }
910
911         return 0;
912 }
913
914 static int __devinit stmpe_chip_init(struct stmpe *stmpe)
915 {
916         unsigned int irq_trigger = stmpe->pdata->irq_trigger;
917         int autosleep_timeout = stmpe->pdata->autosleep_timeout;
918         struct stmpe_variant_info *variant = stmpe->variant;
919         u8 icr = 0;
920         unsigned int id;
921         u8 data[2];
922         int ret;
923
924         ret = stmpe_block_read(stmpe, stmpe->regs[STMPE_IDX_CHIP_ID],
925                                ARRAY_SIZE(data), data);
926         if (ret < 0)
927                 return ret;
928
929         id = (data[0] << 8) | data[1];
930         if ((id & variant->id_mask) != variant->id_val) {
931                 dev_err(stmpe->dev, "unknown chip id: %#x\n", id);
932                 return -EINVAL;
933         }
934
935         dev_info(stmpe->dev, "%s detected, chip id: %#x\n", variant->name, id);
936
937         /* Disable all modules -- subdrivers should enable what they need. */
938         ret = stmpe_disable(stmpe, ~0);
939         if (ret)
940                 return ret;
941
942         if (stmpe->irq >= 0) {
943                 if (id == STMPE801_ID)
944                         icr = STMPE801_REG_SYS_CTRL_INT_EN;
945                 else
946                         icr = STMPE_ICR_LSB_GIM;
947
948                 /* STMPE801 doesn't support Edge interrupts */
949                 if (id != STMPE801_ID) {
950                         if (irq_trigger == IRQF_TRIGGER_FALLING ||
951                                         irq_trigger == IRQF_TRIGGER_RISING)
952                                 icr |= STMPE_ICR_LSB_EDGE;
953                 }
954
955                 if (irq_trigger == IRQF_TRIGGER_RISING ||
956                                 irq_trigger == IRQF_TRIGGER_HIGH) {
957                         if (id == STMPE801_ID)
958                                 icr |= STMPE801_REG_SYS_CTRL_INT_HI;
959                         else
960                                 icr |= STMPE_ICR_LSB_HIGH;
961                 }
962         }
963
964         if (stmpe->pdata->autosleep) {
965                 ret = stmpe_autosleep(stmpe, autosleep_timeout);
966                 if (ret)
967                         return ret;
968         }
969
970         return stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_ICR_LSB], icr);
971 }
972
973 static int __devinit stmpe_add_device(struct stmpe *stmpe,
974                                       struct mfd_cell *cell)
975 {
976         return mfd_add_devices(stmpe->dev, stmpe->pdata->id, cell, 1,
977                                NULL, stmpe->irq_base, stmpe->domain);
978 }
979
980 static int __devinit stmpe_devices_init(struct stmpe *stmpe)
981 {
982         struct stmpe_variant_info *variant = stmpe->variant;
983         unsigned int platform_blocks = stmpe->pdata->blocks;
984         int ret = -EINVAL;
985         int i, j;
986
987         for (i = 0; i < variant->num_blocks; i++) {
988                 struct stmpe_variant_block *block = &variant->blocks[i];
989
990                 if (!(platform_blocks & block->block))
991                         continue;
992
993                 for (j = 0; j < block->cell->num_resources; j++) {
994                         struct resource *res =
995                                 (struct resource *) &block->cell->resources[j];
996
997                         /* Dynamically fill in a variant's IRQ. */
998                         if (res->flags & IORESOURCE_IRQ)
999                                 res->start = res->end = block->irq + j;
1000                 }
1001
1002                 platform_blocks &= ~block->block;
1003                 ret = stmpe_add_device(stmpe, block->cell);
1004                 if (ret)
1005                         return ret;
1006         }
1007
1008         if (platform_blocks)
1009                 dev_warn(stmpe->dev,
1010                          "platform wants blocks (%#x) not present on variant",
1011                          platform_blocks);
1012
1013         return ret;
1014 }
1015
1016 void __devinit stmpe_of_probe(struct stmpe_platform_data *pdata,
1017                         struct device_node *np)
1018 {
1019         struct device_node *child;
1020
1021         pdata->id = -1;
1022         pdata->irq_trigger = IRQF_TRIGGER_NONE;
1023
1024         of_property_read_u32(np, "st,autosleep-timeout",
1025                         &pdata->autosleep_timeout);
1026
1027         pdata->autosleep = (pdata->autosleep_timeout) ? true : false;
1028
1029         for_each_child_of_node(np, child) {
1030                 if (!strcmp(child->name, "stmpe_gpio")) {
1031                         pdata->blocks |= STMPE_BLOCK_GPIO;
1032                 } else if (!strcmp(child->name, "stmpe_keypad")) {
1033                         pdata->blocks |= STMPE_BLOCK_KEYPAD;
1034                 } else if (!strcmp(child->name, "stmpe_touchscreen")) {
1035                         pdata->blocks |= STMPE_BLOCK_TOUCHSCREEN;
1036                 } else if (!strcmp(child->name, "stmpe_adc")) {
1037                         pdata->blocks |= STMPE_BLOCK_ADC;
1038                 } else if (!strcmp(child->name, "stmpe_pwm")) {
1039                         pdata->blocks |= STMPE_BLOCK_PWM;
1040                 } else if (!strcmp(child->name, "stmpe_rotator")) {
1041                         pdata->blocks |= STMPE_BLOCK_ROTATOR;
1042                 }
1043         }
1044 }
1045
1046 /* Called from client specific probe routines */
1047 int __devinit stmpe_probe(struct stmpe_client_info *ci, int partnum)
1048 {
1049         struct stmpe_platform_data *pdata = dev_get_platdata(ci->dev);
1050         struct device_node *np = ci->dev->of_node;
1051         struct stmpe *stmpe;
1052         int ret;
1053
1054         if (!pdata) {
1055                 if (!np)
1056                         return -EINVAL;
1057
1058                 pdata = devm_kzalloc(ci->dev, sizeof(*pdata), GFP_KERNEL);
1059                 if (!pdata)
1060                         return -ENOMEM;
1061
1062                 stmpe_of_probe(pdata, np);
1063         }
1064
1065         stmpe = devm_kzalloc(ci->dev, sizeof(struct stmpe), GFP_KERNEL);
1066         if (!stmpe)
1067                 return -ENOMEM;
1068
1069         mutex_init(&stmpe->irq_lock);
1070         mutex_init(&stmpe->lock);
1071
1072         stmpe->dev = ci->dev;
1073         stmpe->client = ci->client;
1074         stmpe->pdata = pdata;
1075         stmpe->irq_base = pdata->irq_base;
1076         stmpe->ci = ci;
1077         stmpe->partnum = partnum;
1078         stmpe->variant = stmpe_variant_info[partnum];
1079         stmpe->regs = stmpe->variant->regs;
1080         stmpe->num_gpios = stmpe->variant->num_gpios;
1081         dev_set_drvdata(stmpe->dev, stmpe);
1082
1083         if (ci->init)
1084                 ci->init(stmpe);
1085
1086         if (pdata->irq_over_gpio) {
1087                 ret = devm_gpio_request_one(ci->dev, pdata->irq_gpio,
1088                                 GPIOF_DIR_IN, "stmpe");
1089                 if (ret) {
1090                         dev_err(stmpe->dev, "failed to request IRQ GPIO: %d\n",
1091                                         ret);
1092                         return ret;
1093                 }
1094
1095                 stmpe->irq = gpio_to_irq(pdata->irq_gpio);
1096         } else {
1097                 stmpe->irq = ci->irq;
1098         }
1099
1100         if (stmpe->irq < 0) {
1101                 /* use alternate variant info for no-irq mode, if supported */
1102                 dev_info(stmpe->dev,
1103                         "%s configured in no-irq mode by platform data\n",
1104                         stmpe->variant->name);
1105                 if (!stmpe_noirq_variant_info[stmpe->partnum]) {
1106                         dev_err(stmpe->dev,
1107                                 "%s does not support no-irq mode!\n",
1108                                 stmpe->variant->name);
1109                         return -ENODEV;
1110                 }
1111                 stmpe->variant = stmpe_noirq_variant_info[stmpe->partnum];
1112         } else if (pdata->irq_trigger == IRQF_TRIGGER_NONE) {
1113                 pdata->irq_trigger =
1114                         irqd_get_trigger_type(irq_get_irq_data(stmpe->irq));
1115         }
1116
1117         ret = stmpe_chip_init(stmpe);
1118         if (ret)
1119                 return ret;
1120
1121         if (stmpe->irq >= 0) {
1122                 ret = stmpe_irq_init(stmpe, np);
1123                 if (ret)
1124                         return ret;
1125
1126                 ret = devm_request_threaded_irq(ci->dev, stmpe->irq, NULL,
1127                                 stmpe_irq, pdata->irq_trigger | IRQF_ONESHOT,
1128                                 "stmpe", stmpe);
1129                 if (ret) {
1130                         dev_err(stmpe->dev, "failed to request IRQ: %d\n",
1131                                         ret);
1132                         return ret;
1133                 }
1134         }
1135
1136         ret = stmpe_devices_init(stmpe);
1137         if (!ret)
1138                 return 0;
1139
1140         dev_err(stmpe->dev, "failed to add children\n");
1141         mfd_remove_devices(stmpe->dev);
1142
1143         return ret;
1144 }
1145
1146 int stmpe_remove(struct stmpe *stmpe)
1147 {
1148         mfd_remove_devices(stmpe->dev);
1149
1150         return 0;
1151 }
1152
1153 #ifdef CONFIG_PM
1154 static int stmpe_suspend(struct device *dev)
1155 {
1156         struct stmpe *stmpe = dev_get_drvdata(dev);
1157
1158         if (stmpe->irq >= 0 && device_may_wakeup(dev))
1159                 enable_irq_wake(stmpe->irq);
1160
1161         return 0;
1162 }
1163
1164 static int stmpe_resume(struct device *dev)
1165 {
1166         struct stmpe *stmpe = dev_get_drvdata(dev);
1167
1168         if (stmpe->irq >= 0 && device_may_wakeup(dev))
1169                 disable_irq_wake(stmpe->irq);
1170
1171         return 0;
1172 }
1173
1174 const struct dev_pm_ops stmpe_dev_pm_ops = {
1175         .suspend        = stmpe_suspend,
1176         .resume         = stmpe_resume,
1177 };
1178 #endif