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TTY: ldisc, do not close until there are readers
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / mfd / stmpe.c
blob7ab7746631d4e58a9e2fd0611c13da211ce54463
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
18 static int __stmpe_enable(struct stmpe *stmpe, unsigned int blocks)
19 {
20 return stmpe->variant->enable(stmpe, blocks, true);
21 }
22
23 static int __stmpe_disable(struct stmpe *stmpe, unsigned int blocks)
24 {
25 return stmpe->variant->enable(stmpe, blocks, false);
26 }
27
28 static 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
42 static 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
56 static int __stmpe_set_bits(struct stmpe *stmpe, u8 reg, u8 mask, u8 val)
57 {
58 int ret;
59
60 ret = __stmpe_reg_read(stmpe, reg);
61 if (ret < 0)
62 return ret;
63
64 ret &= ~mask;
65 ret |= val;
66
67 return __stmpe_reg_write(stmpe, reg, ret);
68 }
69
70 static int __stmpe_block_read(struct stmpe *stmpe, u8 reg, u8 length,
71 u8 *values)
72 {
73 int ret;
74
75 ret = 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
86 static 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 */
108 int 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 }
118 EXPORT_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 */
125 int 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 }
135 EXPORT_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 */
142 int 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 }
152 EXPORT_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 */
160 int 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 }
170 EXPORT_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 */
179 int 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 }
189 EXPORT_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 */
198 int 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 }
208 EXPORT_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 */
217 int 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 }
228 EXPORT_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 */
242 int 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
279 out:
280 mutex_unlock(&stmpe->lock);
281 return ret;
282 }
283 EXPORT_SYMBOL_GPL(stmpe_set_altfunc);
284
285 /*
286 * GPIO (all variants)
287 */
288
289 static struct resource stmpe_gpio_resources[] = {
290 /* Start and end filled dynamically */
291 {
292 .flags = IORESOURCE_IRQ,
293 },
294 };
295
296 static 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
306 static 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
321 static 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
331 static 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
346 static 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
356 static 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
373 static 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
386 static 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
404 static 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
410 static 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
428 static 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
445 static 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) */
459 static const int stmpe_autosleep_delay[] = {
460 4, 16, 32, 64, 128, 256, 512, 1024,
461 };
462
463 static 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
479 static 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 */
496 static 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
519 static 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
534 static 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
549 static 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
568 static 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
585 static 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
598 static 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
613 static 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
628 static 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
642 static 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
657 static struct stmpe_variant_info *stmpe_variant_info[] = {
658 [STMPE811] = &stmpe811,
659 [STMPE1601] = &stmpe1601,
660 [STMPE2401] = &stmpe2401,
661 [STMPE2403] = &stmpe2403,
662 };
663
664 static 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
702 static 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
709 static 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
730 static 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
740 static 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
750 static 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
758 static 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
779 static 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
794 static 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
842 static 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
849 static 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
877 static 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
887 static 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
898 static 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
952 out_removedevs:
953 mfd_remove_devices(stmpe->dev);
954 free_irq(stmpe->i2c->irq, stmpe);
955 out_removeirq:
956 stmpe_irq_remove(stmpe);
957 out_free:
958 kfree(stmpe);
959 return ret;
960 }
961
962 static 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
976 static const struct i2c_device_id stmpe_id[] = {
977 { "stmpe811", STMPE811 },
978 { "stmpe1601", STMPE1601 },
979 { "stmpe2401", STMPE2401 },
980 { "stmpe2403", STMPE2403 },
981 { }
982 };
983 MODULE_DEVICE_TABLE(i2c, stmpe_id);
984
985 #ifdef CONFIG_PM
986 static const struct dev_pm_ops stmpe_dev_pm_ops = {
987 .suspend = stmpe_suspend,
988 .resume = stmpe_resume,
989 };
990 #endif
991
992 static 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
1003 static int __init stmpe_init(void)
1004 {
1005 return i2c_add_driver(&stmpe_driver);
1006 }
1007 subsys_initcall(stmpe_init);
1008
1009 static void __exit stmpe_exit(void)
1010 {
1011 i2c_del_driver(&stmpe_driver);
1012 }
1013 module_exit(stmpe_exit);
1014
1015 MODULE_LICENSE("GPL v2");
1016 MODULE_DESCRIPTION("STMPE MFD core driver");
1017 MODULE_AUTHOR("Rabin Vincent <rabin.vincent@stericsson.com>");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree