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serial: fix race between flush_to_ldisc and tty_open
[linux-stable.git] / drivers / mfd / wm8350-irq.c
blob27054f357b8e565c2afa07cb6845465c61cef944
1 /*
2 * wm8350-irq.c -- IRQ support for Wolfson WM8350
3 *
4 * Copyright 2007, 2008, 2009 Wolfson Microelectronics PLC.
5 *
6 * Author: Liam Girdwood, Mark Brown
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 *
13 */
14
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17 #include <linux/bug.h>
18 #include <linux/device.h>
19 #include <linux/interrupt.h>
20 #include <linux/irq.h>
21
22 #include <linux/mfd/wm8350/core.h>
23 #include <linux/mfd/wm8350/audio.h>
24 #include <linux/mfd/wm8350/comparator.h>
25 #include <linux/mfd/wm8350/gpio.h>
26 #include <linux/mfd/wm8350/pmic.h>
27 #include <linux/mfd/wm8350/rtc.h>
28 #include <linux/mfd/wm8350/supply.h>
29 #include <linux/mfd/wm8350/wdt.h>
30
31 #define WM8350_INT_OFFSET_1 0
32 #define WM8350_INT_OFFSET_2 1
33 #define WM8350_POWER_UP_INT_OFFSET 2
34 #define WM8350_UNDER_VOLTAGE_INT_OFFSET 3
35 #define WM8350_OVER_CURRENT_INT_OFFSET 4
36 #define WM8350_GPIO_INT_OFFSET 5
37 #define WM8350_COMPARATOR_INT_OFFSET 6
38
39 struct wm8350_irq_data {
40 int primary;
41 int reg;
42 int mask;
43 int primary_only;
44 };
45
46 static struct wm8350_irq_data wm8350_irqs[] = {
47 [WM8350_IRQ_OC_LS] = {
48 .primary = WM8350_OC_INT,
49 .reg = WM8350_OVER_CURRENT_INT_OFFSET,
50 .mask = WM8350_OC_LS_EINT,
51 .primary_only = 1,
52 },
53 [WM8350_IRQ_UV_DC1] = {
54 .primary = WM8350_UV_INT,
55 .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
56 .mask = WM8350_UV_DC1_EINT,
57 },
58 [WM8350_IRQ_UV_DC2] = {
59 .primary = WM8350_UV_INT,
60 .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
61 .mask = WM8350_UV_DC2_EINT,
62 },
63 [WM8350_IRQ_UV_DC3] = {
64 .primary = WM8350_UV_INT,
65 .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
66 .mask = WM8350_UV_DC3_EINT,
67 },
68 [WM8350_IRQ_UV_DC4] = {
69 .primary = WM8350_UV_INT,
70 .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
71 .mask = WM8350_UV_DC4_EINT,
72 },
73 [WM8350_IRQ_UV_DC5] = {
74 .primary = WM8350_UV_INT,
75 .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
76 .mask = WM8350_UV_DC5_EINT,
77 },
78 [WM8350_IRQ_UV_DC6] = {
79 .primary = WM8350_UV_INT,
80 .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
81 .mask = WM8350_UV_DC6_EINT,
82 },
83 [WM8350_IRQ_UV_LDO1] = {
84 .primary = WM8350_UV_INT,
85 .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
86 .mask = WM8350_UV_LDO1_EINT,
87 },
88 [WM8350_IRQ_UV_LDO2] = {
89 .primary = WM8350_UV_INT,
90 .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
91 .mask = WM8350_UV_LDO2_EINT,
92 },
93 [WM8350_IRQ_UV_LDO3] = {
94 .primary = WM8350_UV_INT,
95 .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
96 .mask = WM8350_UV_LDO3_EINT,
97 },
98 [WM8350_IRQ_UV_LDO4] = {
99 .primary = WM8350_UV_INT,
100 .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
101 .mask = WM8350_UV_LDO4_EINT,
102 },
103 [WM8350_IRQ_CHG_BAT_HOT] = {
104 .primary = WM8350_CHG_INT,
105 .reg = WM8350_INT_OFFSET_1,
106 .mask = WM8350_CHG_BAT_HOT_EINT,
107 },
108 [WM8350_IRQ_CHG_BAT_COLD] = {
109 .primary = WM8350_CHG_INT,
110 .reg = WM8350_INT_OFFSET_1,
111 .mask = WM8350_CHG_BAT_COLD_EINT,
112 },
113 [WM8350_IRQ_CHG_BAT_FAIL] = {
114 .primary = WM8350_CHG_INT,
115 .reg = WM8350_INT_OFFSET_1,
116 .mask = WM8350_CHG_BAT_FAIL_EINT,
117 },
118 [WM8350_IRQ_CHG_TO] = {
119 .primary = WM8350_CHG_INT,
120 .reg = WM8350_INT_OFFSET_1,
121 .mask = WM8350_CHG_TO_EINT,
122 },
123 [WM8350_IRQ_CHG_END] = {
124 .primary = WM8350_CHG_INT,
125 .reg = WM8350_INT_OFFSET_1,
126 .mask = WM8350_CHG_END_EINT,
127 },
128 [WM8350_IRQ_CHG_START] = {
129 .primary = WM8350_CHG_INT,
130 .reg = WM8350_INT_OFFSET_1,
131 .mask = WM8350_CHG_START_EINT,
132 },
133 [WM8350_IRQ_CHG_FAST_RDY] = {
134 .primary = WM8350_CHG_INT,
135 .reg = WM8350_INT_OFFSET_1,
136 .mask = WM8350_CHG_FAST_RDY_EINT,
137 },
138 [WM8350_IRQ_CHG_VBATT_LT_3P9] = {
139 .primary = WM8350_CHG_INT,
140 .reg = WM8350_INT_OFFSET_1,
141 .mask = WM8350_CHG_VBATT_LT_3P9_EINT,
142 },
143 [WM8350_IRQ_CHG_VBATT_LT_3P1] = {
144 .primary = WM8350_CHG_INT,
145 .reg = WM8350_INT_OFFSET_1,
146 .mask = WM8350_CHG_VBATT_LT_3P1_EINT,
147 },
148 [WM8350_IRQ_CHG_VBATT_LT_2P85] = {
149 .primary = WM8350_CHG_INT,
150 .reg = WM8350_INT_OFFSET_1,
151 .mask = WM8350_CHG_VBATT_LT_2P85_EINT,
152 },
153 [WM8350_IRQ_RTC_ALM] = {
154 .primary = WM8350_RTC_INT,
155 .reg = WM8350_INT_OFFSET_1,
156 .mask = WM8350_RTC_ALM_EINT,
157 },
158 [WM8350_IRQ_RTC_SEC] = {
159 .primary = WM8350_RTC_INT,
160 .reg = WM8350_INT_OFFSET_1,
161 .mask = WM8350_RTC_SEC_EINT,
162 },
163 [WM8350_IRQ_RTC_PER] = {
164 .primary = WM8350_RTC_INT,
165 .reg = WM8350_INT_OFFSET_1,
166 .mask = WM8350_RTC_PER_EINT,
167 },
168 [WM8350_IRQ_CS1] = {
169 .primary = WM8350_CS_INT,
170 .reg = WM8350_INT_OFFSET_2,
171 .mask = WM8350_CS1_EINT,
172 },
173 [WM8350_IRQ_CS2] = {
174 .primary = WM8350_CS_INT,
175 .reg = WM8350_INT_OFFSET_2,
176 .mask = WM8350_CS2_EINT,
177 },
178 [WM8350_IRQ_SYS_HYST_COMP_FAIL] = {
179 .primary = WM8350_SYS_INT,
180 .reg = WM8350_INT_OFFSET_2,
181 .mask = WM8350_SYS_HYST_COMP_FAIL_EINT,
182 },
183 [WM8350_IRQ_SYS_CHIP_GT115] = {
184 .primary = WM8350_SYS_INT,
185 .reg = WM8350_INT_OFFSET_2,
186 .mask = WM8350_SYS_CHIP_GT115_EINT,
187 },
188 [WM8350_IRQ_SYS_CHIP_GT140] = {
189 .primary = WM8350_SYS_INT,
190 .reg = WM8350_INT_OFFSET_2,
191 .mask = WM8350_SYS_CHIP_GT140_EINT,
192 },
193 [WM8350_IRQ_SYS_WDOG_TO] = {
194 .primary = WM8350_SYS_INT,
195 .reg = WM8350_INT_OFFSET_2,
196 .mask = WM8350_SYS_WDOG_TO_EINT,
197 },
198 [WM8350_IRQ_AUXADC_DATARDY] = {
199 .primary = WM8350_AUXADC_INT,
200 .reg = WM8350_INT_OFFSET_2,
201 .mask = WM8350_AUXADC_DATARDY_EINT,
202 },
203 [WM8350_IRQ_AUXADC_DCOMP4] = {
204 .primary = WM8350_AUXADC_INT,
205 .reg = WM8350_INT_OFFSET_2,
206 .mask = WM8350_AUXADC_DCOMP4_EINT,
207 },
208 [WM8350_IRQ_AUXADC_DCOMP3] = {
209 .primary = WM8350_AUXADC_INT,
210 .reg = WM8350_INT_OFFSET_2,
211 .mask = WM8350_AUXADC_DCOMP3_EINT,
212 },
213 [WM8350_IRQ_AUXADC_DCOMP2] = {
214 .primary = WM8350_AUXADC_INT,
215 .reg = WM8350_INT_OFFSET_2,
216 .mask = WM8350_AUXADC_DCOMP2_EINT,
217 },
218 [WM8350_IRQ_AUXADC_DCOMP1] = {
219 .primary = WM8350_AUXADC_INT,
220 .reg = WM8350_INT_OFFSET_2,
221 .mask = WM8350_AUXADC_DCOMP1_EINT,
222 },
223 [WM8350_IRQ_USB_LIMIT] = {
224 .primary = WM8350_USB_INT,
225 .reg = WM8350_INT_OFFSET_2,
226 .mask = WM8350_USB_LIMIT_EINT,
227 .primary_only = 1,
228 },
229 [WM8350_IRQ_WKUP_OFF_STATE] = {
230 .primary = WM8350_WKUP_INT,
231 .reg = WM8350_COMPARATOR_INT_OFFSET,
232 .mask = WM8350_WKUP_OFF_STATE_EINT,
233 },
234 [WM8350_IRQ_WKUP_HIB_STATE] = {
235 .primary = WM8350_WKUP_INT,
236 .reg = WM8350_COMPARATOR_INT_OFFSET,
237 .mask = WM8350_WKUP_HIB_STATE_EINT,
238 },
239 [WM8350_IRQ_WKUP_CONV_FAULT] = {
240 .primary = WM8350_WKUP_INT,
241 .reg = WM8350_COMPARATOR_INT_OFFSET,
242 .mask = WM8350_WKUP_CONV_FAULT_EINT,
243 },
244 [WM8350_IRQ_WKUP_WDOG_RST] = {
245 .primary = WM8350_WKUP_INT,
246 .reg = WM8350_COMPARATOR_INT_OFFSET,
247 .mask = WM8350_WKUP_WDOG_RST_EINT,
248 },
249 [WM8350_IRQ_WKUP_GP_PWR_ON] = {
250 .primary = WM8350_WKUP_INT,
251 .reg = WM8350_COMPARATOR_INT_OFFSET,
252 .mask = WM8350_WKUP_GP_PWR_ON_EINT,
253 },
254 [WM8350_IRQ_WKUP_ONKEY] = {
255 .primary = WM8350_WKUP_INT,
256 .reg = WM8350_COMPARATOR_INT_OFFSET,
257 .mask = WM8350_WKUP_ONKEY_EINT,
258 },
259 [WM8350_IRQ_WKUP_GP_WAKEUP] = {
260 .primary = WM8350_WKUP_INT,
261 .reg = WM8350_COMPARATOR_INT_OFFSET,
262 .mask = WM8350_WKUP_GP_WAKEUP_EINT,
263 },
264 [WM8350_IRQ_CODEC_JCK_DET_L] = {
265 .primary = WM8350_CODEC_INT,
266 .reg = WM8350_COMPARATOR_INT_OFFSET,
267 .mask = WM8350_CODEC_JCK_DET_L_EINT,
268 },
269 [WM8350_IRQ_CODEC_JCK_DET_R] = {
270 .primary = WM8350_CODEC_INT,
271 .reg = WM8350_COMPARATOR_INT_OFFSET,
272 .mask = WM8350_CODEC_JCK_DET_R_EINT,
273 },
274 [WM8350_IRQ_CODEC_MICSCD] = {
275 .primary = WM8350_CODEC_INT,
276 .reg = WM8350_COMPARATOR_INT_OFFSET,
277 .mask = WM8350_CODEC_MICSCD_EINT,
278 },
279 [WM8350_IRQ_CODEC_MICD] = {
280 .primary = WM8350_CODEC_INT,
281 .reg = WM8350_COMPARATOR_INT_OFFSET,
282 .mask = WM8350_CODEC_MICD_EINT,
283 },
284 [WM8350_IRQ_EXT_USB_FB] = {
285 .primary = WM8350_EXT_INT,
286 .reg = WM8350_COMPARATOR_INT_OFFSET,
287 .mask = WM8350_EXT_USB_FB_EINT,
288 },
289 [WM8350_IRQ_EXT_WALL_FB] = {
290 .primary = WM8350_EXT_INT,
291 .reg = WM8350_COMPARATOR_INT_OFFSET,
292 .mask = WM8350_EXT_WALL_FB_EINT,
293 },
294 [WM8350_IRQ_EXT_BAT_FB] = {
295 .primary = WM8350_EXT_INT,
296 .reg = WM8350_COMPARATOR_INT_OFFSET,
297 .mask = WM8350_EXT_BAT_FB_EINT,
298 },
299 [WM8350_IRQ_GPIO(0)] = {
300 .primary = WM8350_GP_INT,
301 .reg = WM8350_GPIO_INT_OFFSET,
302 .mask = WM8350_GP0_EINT,
303 },
304 [WM8350_IRQ_GPIO(1)] = {
305 .primary = WM8350_GP_INT,
306 .reg = WM8350_GPIO_INT_OFFSET,
307 .mask = WM8350_GP1_EINT,
308 },
309 [WM8350_IRQ_GPIO(2)] = {
310 .primary = WM8350_GP_INT,
311 .reg = WM8350_GPIO_INT_OFFSET,
312 .mask = WM8350_GP2_EINT,
313 },
314 [WM8350_IRQ_GPIO(3)] = {
315 .primary = WM8350_GP_INT,
316 .reg = WM8350_GPIO_INT_OFFSET,
317 .mask = WM8350_GP3_EINT,
318 },
319 [WM8350_IRQ_GPIO(4)] = {
320 .primary = WM8350_GP_INT,
321 .reg = WM8350_GPIO_INT_OFFSET,
322 .mask = WM8350_GP4_EINT,
323 },
324 [WM8350_IRQ_GPIO(5)] = {
325 .primary = WM8350_GP_INT,
326 .reg = WM8350_GPIO_INT_OFFSET,
327 .mask = WM8350_GP5_EINT,
328 },
329 [WM8350_IRQ_GPIO(6)] = {
330 .primary = WM8350_GP_INT,
331 .reg = WM8350_GPIO_INT_OFFSET,
332 .mask = WM8350_GP6_EINT,
333 },
334 [WM8350_IRQ_GPIO(7)] = {
335 .primary = WM8350_GP_INT,
336 .reg = WM8350_GPIO_INT_OFFSET,
337 .mask = WM8350_GP7_EINT,
338 },
339 [WM8350_IRQ_GPIO(8)] = {
340 .primary = WM8350_GP_INT,
341 .reg = WM8350_GPIO_INT_OFFSET,
342 .mask = WM8350_GP8_EINT,
343 },
344 [WM8350_IRQ_GPIO(9)] = {
345 .primary = WM8350_GP_INT,
346 .reg = WM8350_GPIO_INT_OFFSET,
347 .mask = WM8350_GP9_EINT,
348 },
349 [WM8350_IRQ_GPIO(10)] = {
350 .primary = WM8350_GP_INT,
351 .reg = WM8350_GPIO_INT_OFFSET,
352 .mask = WM8350_GP10_EINT,
353 },
354 [WM8350_IRQ_GPIO(11)] = {
355 .primary = WM8350_GP_INT,
356 .reg = WM8350_GPIO_INT_OFFSET,
357 .mask = WM8350_GP11_EINT,
358 },
359 [WM8350_IRQ_GPIO(12)] = {
360 .primary = WM8350_GP_INT,
361 .reg = WM8350_GPIO_INT_OFFSET,
362 .mask = WM8350_GP12_EINT,
363 },
364 };
365
366 static inline struct wm8350_irq_data *irq_to_wm8350_irq(struct wm8350 *wm8350,
367 int irq)
368 {
369 return &wm8350_irqs[irq - wm8350->irq_base];
370 }
371
372 /*
373 * This is a threaded IRQ handler so can access I2C/SPI. Since all
374 * interrupts are clear on read the IRQ line will be reasserted and
375 * the physical IRQ will be handled again if another interrupt is
376 * asserted while we run - in the normal course of events this is a
377 * rare occurrence so we save I2C/SPI reads. We're also assuming that
378 * it's rare to get lots of interrupts firing simultaneously so try to
379 * minimise I/O.
380 */
381 static irqreturn_t wm8350_irq(int irq, void *irq_data)
382 {
383 struct wm8350 *wm8350 = irq_data;
384 u16 level_one;
385 u16 sub_reg[WM8350_NUM_IRQ_REGS];
386 int read_done[WM8350_NUM_IRQ_REGS];
387 struct wm8350_irq_data *data;
388 int i;
389
390 level_one = wm8350_reg_read(wm8350, WM8350_SYSTEM_INTERRUPTS)
391 & ~wm8350_reg_read(wm8350, WM8350_SYSTEM_INTERRUPTS_MASK);
392
393 if (!level_one)
394 return IRQ_NONE;
395
396 memset(&read_done, 0, sizeof(read_done));
397
398 for (i = 0; i < ARRAY_SIZE(wm8350_irqs); i++) {
399 data = &wm8350_irqs[i];
400
401 if (!(level_one & data->primary))
402 continue;
403
404 if (!read_done[data->reg]) {
405 sub_reg[data->reg] =
406 wm8350_reg_read(wm8350, WM8350_INT_STATUS_1 +
407 data->reg);
408 sub_reg[data->reg] &= ~wm8350->irq_masks[data->reg];
409 read_done[data->reg] = 1;
410 }
411
412 if (sub_reg[data->reg] & data->mask)
413 handle_nested_irq(wm8350->irq_base + i);
414 }
415
416 return IRQ_HANDLED;
417 }
418
419 static void wm8350_irq_lock(struct irq_data *data)
420 {
421 struct wm8350 *wm8350 = irq_data_get_irq_chip_data(data);
422
423 mutex_lock(&wm8350->irq_lock);
424 }
425
426 static void wm8350_irq_sync_unlock(struct irq_data *data)
427 {
428 struct wm8350 *wm8350 = irq_data_get_irq_chip_data(data);
429 int i;
430
431 for (i = 0; i < ARRAY_SIZE(wm8350->irq_masks); i++) {
432 /* If there's been a change in the mask write it back
433 * to the hardware. */
434 WARN_ON(regmap_update_bits(wm8350->regmap,
435 WM8350_INT_STATUS_1_MASK + i,
436 0xffff, wm8350->irq_masks[i]));
437 }
438
439 mutex_unlock(&wm8350->irq_lock);
440 }
441
442 static void wm8350_irq_enable(struct irq_data *data)
443 {
444 struct wm8350 *wm8350 = irq_data_get_irq_chip_data(data);
445 struct wm8350_irq_data *irq_data = irq_to_wm8350_irq(wm8350,
446 data->irq);
447
448 wm8350->irq_masks[irq_data->reg] &= ~irq_data->mask;
449 }
450
451 static void wm8350_irq_disable(struct irq_data *data)
452 {
453 struct wm8350 *wm8350 = irq_data_get_irq_chip_data(data);
454 struct wm8350_irq_data *irq_data = irq_to_wm8350_irq(wm8350,
455 data->irq);
456
457 wm8350->irq_masks[irq_data->reg] |= irq_data->mask;
458 }
459
460 static struct irq_chip wm8350_irq_chip = {
461 .name = "wm8350",
462 .irq_bus_lock = wm8350_irq_lock,
463 .irq_bus_sync_unlock = wm8350_irq_sync_unlock,
464 .irq_disable = wm8350_irq_disable,
465 .irq_enable = wm8350_irq_enable,
466 };
467
468 int wm8350_irq_init(struct wm8350 *wm8350, int irq,
469 struct wm8350_platform_data *pdata)
470 {
471 int ret, cur_irq, i;
472 int flags = IRQF_ONESHOT;
473 int irq_base = -1;
474
475 if (!irq) {
476 dev_warn(wm8350->dev, "No interrupt support, no core IRQ\n");
477 return 0;
478 }
479
480 /* Mask top level interrupts */
481 wm8350_reg_write(wm8350, WM8350_SYSTEM_INTERRUPTS_MASK, 0xFFFF);
482
483 /* Mask all individual interrupts by default and cache the
484 * masks. We read the masks back since there are unwritable
485 * bits in the mask registers. */
486 for (i = 0; i < ARRAY_SIZE(wm8350->irq_masks); i++) {
487 wm8350_reg_write(wm8350, WM8350_INT_STATUS_1_MASK + i,
488 0xFFFF);
489 wm8350->irq_masks[i] =
490 wm8350_reg_read(wm8350,
491 WM8350_INT_STATUS_1_MASK + i);
492 }
493
494 mutex_init(&wm8350->irq_lock);
495 wm8350->chip_irq = irq;
496
497 if (pdata && pdata->irq_base > 0)
498 irq_base = pdata->irq_base;
499
500 wm8350->irq_base =
501 irq_alloc_descs(irq_base, 0, ARRAY_SIZE(wm8350_irqs), 0);
502 if (wm8350->irq_base < 0) {
503 dev_warn(wm8350->dev, "Allocating irqs failed with %d\n",
504 wm8350->irq_base);
505 return 0;
506 }
507
508 if (pdata && pdata->irq_high) {
509 flags |= IRQF_TRIGGER_HIGH;
510
511 wm8350_set_bits(wm8350, WM8350_SYSTEM_CONTROL_1,
512 WM8350_IRQ_POL);
513 } else {
514 flags |= IRQF_TRIGGER_LOW;
515
516 wm8350_clear_bits(wm8350, WM8350_SYSTEM_CONTROL_1,
517 WM8350_IRQ_POL);
518 }
519
520 /* Register with genirq */
521 for (cur_irq = wm8350->irq_base;
522 cur_irq < ARRAY_SIZE(wm8350_irqs) + wm8350->irq_base;
523 cur_irq++) {
524 irq_set_chip_data(cur_irq, wm8350);
525 irq_set_chip_and_handler(cur_irq, &wm8350_irq_chip,
526 handle_edge_irq);
527 irq_set_nested_thread(cur_irq, 1);
528
529 irq_clear_status_flags(cur_irq, IRQ_NOREQUEST | IRQ_NOPROBE);
530 }
531
532 ret = request_threaded_irq(irq, NULL, wm8350_irq, flags,
533 "wm8350", wm8350);
534 if (ret != 0)
535 dev_err(wm8350->dev, "Failed to request IRQ: %d\n", ret);
536
537 /* Allow interrupts to fire */
538 wm8350_reg_write(wm8350, WM8350_SYSTEM_INTERRUPTS_MASK, 0);
539
540 return ret;
541 }
542
543 int wm8350_irq_exit(struct wm8350 *wm8350)
544 {
545 free_irq(wm8350->chip_irq, wm8350);
546 return 0;
547 }
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