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authorRabin Vincent <rabin.vincent@stericsson.com>2010-07-02 07:22:08 -0400
committerSamuel Ortiz <sameo@linux.intel.com>2010-08-12 05:27:24 -0400
commit27e34995e1a863c1e9beba30e51dfe2a083f918d (patch)
treee7ad3ee4794a3c2cf7d3922610335a6391c987c8 /drivers/mfd/stmpe.c
parentd2d272a965baeb3d78f843374bc48f0cbce8ac3d (diff)
mfd: Add STMPE I/O Expander support
Add support for the STMPE family of I/O Expanders from STMicroelectronics. These devices include upto 24 gpios and a varying selection of blocks, including PWM, keypad, and touchscreen controllers. This patch adds the MFD core. [l.fu@pengutronix.de: fix stmpe811 enable hook] [l.fu@pengutronix.de: add touchscreen platform data] Acked-by: Luotao Fu <l.fu@pengutronix.de> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'drivers/mfd/stmpe.c')
-rw-r--r--drivers/mfd/stmpe.c915
1 files changed, 915 insertions, 0 deletions
diff --git a/drivers/mfd/stmpe.c b/drivers/mfd/stmpe.c
new file mode 100644
index 000000000000..a7f3099fdcfd
--- /dev/null
+++ b/drivers/mfd/stmpe.c
@@ -0,0 +1,915 @@
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
458static int stmpe1601_enable(struct stmpe *stmpe, unsigned int blocks,
459 bool enable)
460{
461 unsigned int mask = 0;
462
463 if (blocks & STMPE_BLOCK_GPIO)
464 mask |= STMPE1601_SYS_CTRL_ENABLE_GPIO;
465
466 if (blocks & STMPE_BLOCK_KEYPAD)
467 mask |= STMPE1601_SYS_CTRL_ENABLE_KPC;
468
469 return __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL, mask,
470 enable ? mask : 0);
471}
472
473static int stmpe1601_get_altfunc(struct stmpe *stmpe, enum stmpe_block block)
474{
475 switch (block) {
476 case STMPE_BLOCK_PWM:
477 return 2;
478
479 case STMPE_BLOCK_KEYPAD:
480 return 1;
481
482 case STMPE_BLOCK_GPIO:
483 default:
484 return 0;
485 }
486}
487
488static struct stmpe_variant_info stmpe1601 = {
489 .name = "stmpe1601",
490 .id_val = 0x0210,
491 .id_mask = 0xfff0, /* at least 0x0210 and 0x0212 */
492 .num_gpios = 16,
493 .af_bits = 2,
494 .regs = stmpe1601_regs,
495 .blocks = stmpe1601_blocks,
496 .num_blocks = ARRAY_SIZE(stmpe1601_blocks),
497 .num_irqs = STMPE1601_NR_INTERNAL_IRQS,
498 .enable = stmpe1601_enable,
499 .get_altfunc = stmpe1601_get_altfunc,
500};
501
502/*
503 * STMPE24XX
504 */
505
506static const u8 stmpe24xx_regs[] = {
507 [STMPE_IDX_CHIP_ID] = STMPE24XX_REG_CHIP_ID,
508 [STMPE_IDX_ICR_LSB] = STMPE24XX_REG_ICR_LSB,
509 [STMPE_IDX_IER_LSB] = STMPE24XX_REG_IER_LSB,
510 [STMPE_IDX_ISR_MSB] = STMPE24XX_REG_ISR_MSB,
511 [STMPE_IDX_GPMR_LSB] = STMPE24XX_REG_GPMR_LSB,
512 [STMPE_IDX_GPSR_LSB] = STMPE24XX_REG_GPSR_LSB,
513 [STMPE_IDX_GPCR_LSB] = STMPE24XX_REG_GPCR_LSB,
514 [STMPE_IDX_GPDR_LSB] = STMPE24XX_REG_GPDR_LSB,
515 [STMPE_IDX_GPRER_LSB] = STMPE24XX_REG_GPRER_LSB,
516 [STMPE_IDX_GPFER_LSB] = STMPE24XX_REG_GPFER_LSB,
517 [STMPE_IDX_GPAFR_U_MSB] = STMPE24XX_REG_GPAFR_U_MSB,
518 [STMPE_IDX_IEGPIOR_LSB] = STMPE24XX_REG_IEGPIOR_LSB,
519 [STMPE_IDX_ISGPIOR_MSB] = STMPE24XX_REG_ISGPIOR_MSB,
520 [STMPE_IDX_GPEDR_MSB] = STMPE24XX_REG_GPEDR_MSB,
521};
522
523static struct stmpe_variant_block stmpe24xx_blocks[] = {
524 {
525 .cell = &stmpe_gpio_cell,
526 .irq = STMPE24XX_IRQ_GPIOC,
527 .block = STMPE_BLOCK_GPIO,
528 },
529 {
530 .cell = &stmpe_keypad_cell,
531 .irq = STMPE24XX_IRQ_KEYPAD,
532 .block = STMPE_BLOCK_KEYPAD,
533 },
534};
535
536static int stmpe24xx_enable(struct stmpe *stmpe, unsigned int blocks,
537 bool enable)
538{
539 unsigned int mask = 0;
540
541 if (blocks & STMPE_BLOCK_GPIO)
542 mask |= STMPE24XX_SYS_CTRL_ENABLE_GPIO;
543
544 if (blocks & STMPE_BLOCK_KEYPAD)
545 mask |= STMPE24XX_SYS_CTRL_ENABLE_KPC;
546
547 return __stmpe_set_bits(stmpe, STMPE24XX_REG_SYS_CTRL, mask,
548 enable ? mask : 0);
549}
550
551static int stmpe24xx_get_altfunc(struct stmpe *stmpe, enum stmpe_block block)
552{
553 switch (block) {
554 case STMPE_BLOCK_ROTATOR:
555 return 2;
556
557 case STMPE_BLOCK_KEYPAD:
558 return 1;
559
560 case STMPE_BLOCK_GPIO:
561 default:
562 return 0;
563 }
564}
565
566static struct stmpe_variant_info stmpe2401 = {
567 .name = "stmpe2401",
568 .id_val = 0x0101,
569 .id_mask = 0xffff,
570 .num_gpios = 24,
571 .af_bits = 2,
572 .regs = stmpe24xx_regs,
573 .blocks = stmpe24xx_blocks,
574 .num_blocks = ARRAY_SIZE(stmpe24xx_blocks),
575 .num_irqs = STMPE24XX_NR_INTERNAL_IRQS,
576 .enable = stmpe24xx_enable,
577 .get_altfunc = stmpe24xx_get_altfunc,
578};
579
580static struct stmpe_variant_info stmpe2403 = {
581 .name = "stmpe2403",
582 .id_val = 0x0120,
583 .id_mask = 0xffff,
584 .num_gpios = 24,
585 .af_bits = 2,
586 .regs = stmpe24xx_regs,
587 .blocks = stmpe24xx_blocks,
588 .num_blocks = ARRAY_SIZE(stmpe24xx_blocks),
589 .num_irqs = STMPE24XX_NR_INTERNAL_IRQS,
590 .enable = stmpe24xx_enable,
591 .get_altfunc = stmpe24xx_get_altfunc,
592};
593
594static struct stmpe_variant_info *stmpe_variant_info[] = {
595 [STMPE811] = &stmpe811,
596 [STMPE1601] = &stmpe1601,
597 [STMPE2401] = &stmpe2401,
598 [STMPE2403] = &stmpe2403,
599};
600
601static irqreturn_t stmpe_irq(int irq, void *data)
602{
603 struct stmpe *stmpe = data;
604 struct stmpe_variant_info *variant = stmpe->variant;
605 int num = DIV_ROUND_UP(variant->num_irqs, 8);
606 u8 israddr = stmpe->regs[STMPE_IDX_ISR_MSB];
607 u8 isr[num];
608 int ret;
609 int i;
610
611 ret = stmpe_block_read(stmpe, israddr, num, isr);
612 if (ret < 0)
613 return IRQ_NONE;
614
615 for (i = 0; i < num; i++) {
616 int bank = num - i - 1;
617 u8 status = isr[i];
618 u8 clear;
619
620 status &= stmpe->ier[bank];
621 if (!status)
622 continue;
623
624 clear = status;
625 while (status) {
626 int bit = __ffs(status);
627 int line = bank * 8 + bit;
628
629 handle_nested_irq(stmpe->irq_base + line);
630 status &= ~(1 << bit);
631 }
632
633 stmpe_reg_write(stmpe, israddr + i, clear);
634 }
635
636 return IRQ_HANDLED;
637}
638
639static void stmpe_irq_lock(unsigned int irq)
640{
641 struct stmpe *stmpe = get_irq_chip_data(irq);
642
643 mutex_lock(&stmpe->irq_lock);
644}
645
646static void stmpe_irq_sync_unlock(unsigned int irq)
647{
648 struct stmpe *stmpe = get_irq_chip_data(irq);
649 struct stmpe_variant_info *variant = stmpe->variant;
650 int num = DIV_ROUND_UP(variant->num_irqs, 8);
651 int i;
652
653 for (i = 0; i < num; i++) {
654 u8 new = stmpe->ier[i];
655 u8 old = stmpe->oldier[i];
656
657 if (new == old)
658 continue;
659
660 stmpe->oldier[i] = new;
661 stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_IER_LSB] - i, new);
662 }
663
664 mutex_unlock(&stmpe->irq_lock);
665}
666
667static void stmpe_irq_mask(unsigned int irq)
668{
669 struct stmpe *stmpe = get_irq_chip_data(irq);
670 int offset = irq - stmpe->irq_base;
671 int regoffset = offset / 8;
672 int mask = 1 << (offset % 8);
673
674 stmpe->ier[regoffset] &= ~mask;
675}
676
677static void stmpe_irq_unmask(unsigned int irq)
678{
679 struct stmpe *stmpe = get_irq_chip_data(irq);
680 int offset = irq - stmpe->irq_base;
681 int regoffset = offset / 8;
682 int mask = 1 << (offset % 8);
683
684 stmpe->ier[regoffset] |= mask;
685}
686
687static struct irq_chip stmpe_irq_chip = {
688 .name = "stmpe",
689 .bus_lock = stmpe_irq_lock,
690 .bus_sync_unlock = stmpe_irq_sync_unlock,
691 .mask = stmpe_irq_mask,
692 .unmask = stmpe_irq_unmask,
693};
694
695static int __devinit stmpe_irq_init(struct stmpe *stmpe)
696{
697 int num_irqs = stmpe->variant->num_irqs;
698 int base = stmpe->irq_base;
699 int irq;
700
701 for (irq = base; irq < base + num_irqs; irq++) {
702 set_irq_chip_data(irq, stmpe);
703 set_irq_chip_and_handler(irq, &stmpe_irq_chip,
704 handle_edge_irq);
705 set_irq_nested_thread(irq, 1);
706#ifdef CONFIG_ARM
707 set_irq_flags(irq, IRQF_VALID);
708#else
709 set_irq_noprobe(irq);
710#endif
711 }
712
713 return 0;
714}
715
716static void stmpe_irq_remove(struct stmpe *stmpe)
717{
718 int num_irqs = stmpe->variant->num_irqs;
719 int base = stmpe->irq_base;
720 int irq;
721
722 for (irq = base; irq < base + num_irqs; irq++) {
723#ifdef CONFIG_ARM
724 set_irq_flags(irq, 0);
725#endif
726 set_irq_chip_and_handler(irq, NULL, NULL);
727 set_irq_chip_data(irq, NULL);
728 }
729}
730
731static int __devinit stmpe_chip_init(struct stmpe *stmpe)
732{
733 unsigned int irq_trigger = stmpe->pdata->irq_trigger;
734 struct stmpe_variant_info *variant = stmpe->variant;
735 u8 icr = STMPE_ICR_LSB_GIM;
736 unsigned int id;
737 u8 data[2];
738 int ret;
739
740 ret = stmpe_block_read(stmpe, stmpe->regs[STMPE_IDX_CHIP_ID],
741 ARRAY_SIZE(data), data);
742 if (ret < 0)
743 return ret;
744
745 id = (data[0] << 8) | data[1];
746 if ((id & variant->id_mask) != variant->id_val) {
747 dev_err(stmpe->dev, "unknown chip id: %#x\n", id);
748 return -EINVAL;
749 }
750
751 dev_info(stmpe->dev, "%s detected, chip id: %#x\n", variant->name, id);
752
753 /* Disable all modules -- subdrivers should enable what they need. */
754 ret = stmpe_disable(stmpe, ~0);
755 if (ret)
756 return ret;
757
758 if (irq_trigger == IRQF_TRIGGER_FALLING ||
759 irq_trigger == IRQF_TRIGGER_RISING)
760 icr |= STMPE_ICR_LSB_EDGE;
761
762 if (irq_trigger == IRQF_TRIGGER_RISING ||
763 irq_trigger == IRQF_TRIGGER_HIGH)
764 icr |= STMPE_ICR_LSB_HIGH;
765
766 if (stmpe->pdata->irq_invert_polarity)
767 icr ^= STMPE_ICR_LSB_HIGH;
768
769 return stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_ICR_LSB], icr);
770}
771
772static int __devinit stmpe_add_device(struct stmpe *stmpe,
773 struct mfd_cell *cell, int irq)
774{
775 return mfd_add_devices(stmpe->dev, stmpe->pdata->id, cell, 1,
776 NULL, stmpe->irq_base + irq);
777}
778
779static int __devinit stmpe_devices_init(struct stmpe *stmpe)
780{
781 struct stmpe_variant_info *variant = stmpe->variant;
782 unsigned int platform_blocks = stmpe->pdata->blocks;
783 int ret = -EINVAL;
784 int i;
785
786 for (i = 0; i < variant->num_blocks; i++) {
787 struct stmpe_variant_block *block = &variant->blocks[i];
788
789 if (!(platform_blocks & block->block))
790 continue;
791
792 platform_blocks &= ~block->block;
793 ret = stmpe_add_device(stmpe, block->cell, block->irq);
794 if (ret)
795 return ret;
796 }
797
798 if (platform_blocks)
799 dev_warn(stmpe->dev,
800 "platform wants blocks (%#x) not present on variant",
801 platform_blocks);
802
803 return ret;
804}
805
806static int __devinit stmpe_probe(struct i2c_client *i2c,
807 const struct i2c_device_id *id)
808{
809 struct stmpe_platform_data *pdata = i2c->dev.platform_data;
810 struct stmpe *stmpe;
811 int ret;
812
813 if (!pdata)
814 return -EINVAL;
815
816 stmpe = kzalloc(sizeof(struct stmpe), GFP_KERNEL);
817 if (!stmpe)
818 return -ENOMEM;
819
820 mutex_init(&stmpe->irq_lock);
821 mutex_init(&stmpe->lock);
822
823 stmpe->dev = &i2c->dev;
824 stmpe->i2c = i2c;
825
826 stmpe->pdata = pdata;
827 stmpe->irq_base = pdata->irq_base;
828
829 stmpe->partnum = id->driver_data;
830 stmpe->variant = stmpe_variant_info[stmpe->partnum];
831 stmpe->regs = stmpe->variant->regs;
832 stmpe->num_gpios = stmpe->variant->num_gpios;
833
834 i2c_set_clientdata(i2c, stmpe);
835
836 ret = stmpe_chip_init(stmpe);
837 if (ret)
838 goto out_free;
839
840 ret = stmpe_irq_init(stmpe);
841 if (ret)
842 goto out_free;
843
844 ret = request_threaded_irq(stmpe->i2c->irq, NULL, stmpe_irq,
845 pdata->irq_trigger | IRQF_ONESHOT,
846 "stmpe", stmpe);
847 if (ret) {
848 dev_err(stmpe->dev, "failed to request IRQ: %d\n", ret);
849 goto out_removeirq;
850 }
851
852 ret = stmpe_devices_init(stmpe);
853 if (ret) {
854 dev_err(stmpe->dev, "failed to add children\n");
855 goto out_removedevs;
856 }
857
858 return 0;
859
860out_removedevs:
861 mfd_remove_devices(stmpe->dev);
862 free_irq(stmpe->i2c->irq, stmpe);
863out_removeirq:
864 stmpe_irq_remove(stmpe);
865out_free:
866 kfree(stmpe);
867 return ret;
868}
869
870static int __devexit stmpe_remove(struct i2c_client *client)
871{
872 struct stmpe *stmpe = i2c_get_clientdata(client);
873
874 mfd_remove_devices(stmpe->dev);
875
876 free_irq(stmpe->i2c->irq, stmpe);
877 stmpe_irq_remove(stmpe);
878
879 kfree(stmpe);
880
881 return 0;
882}
883
884static const struct i2c_device_id stmpe_id[] = {
885 { "stmpe811", STMPE811 },
886 { "stmpe1601", STMPE1601 },
887 { "stmpe2401", STMPE2401 },
888 { "stmpe2403", STMPE2403 },
889 { }
890};
891MODULE_DEVICE_TABLE(i2c, stmpe_id);
892
893static struct i2c_driver stmpe_driver = {
894 .driver.name = "stmpe",
895 .driver.owner = THIS_MODULE,
896 .probe = stmpe_probe,
897 .remove = __devexit_p(stmpe_remove),
898 .id_table = stmpe_id,
899};
900
901static int __init stmpe_init(void)
902{
903 return i2c_add_driver(&stmpe_driver);
904}
905subsys_initcall(stmpe_init);
906
907static void __exit stmpe_exit(void)
908{
909 i2c_del_driver(&stmpe_driver);
910}
911module_exit(stmpe_exit);
912
913MODULE_LICENSE("GPL v2");
914MODULE_DESCRIPTION("STMPE MFD core driver");
915MODULE_AUTHOR("Rabin Vincent <rabin.vincent@stericsson.com>");
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-11 11:44:12 -0500