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path: root/drivers/mfd/wm831x-irq.c
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Diffstat (limited to 'drivers/mfd/wm831x-irq.c')
-rw-r--r--drivers/mfd/wm831x-irq.c559
1 files changed, 559 insertions, 0 deletions
diff --git a/drivers/mfd/wm831x-irq.c b/drivers/mfd/wm831x-irq.c
new file mode 100644
index 000000000000..d3015dfb9134
--- /dev/null
+++ b/drivers/mfd/wm831x-irq.c
@@ -0,0 +1,559 @@
1/*
2 * wm831x-irq.c -- Interrupt controller support for Wolfson WM831x PMICs
3 *
4 * Copyright 2009 Wolfson Microelectronics PLC.
5 *
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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/i2c.h>
18#include <linux/mfd/core.h>
19#include <linux/interrupt.h>
20
21#include <linux/mfd/wm831x/core.h>
22#include <linux/mfd/wm831x/pdata.h>
23#include <linux/mfd/wm831x/irq.h>
24
25#include <linux/delay.h>
26
27/*
28 * Since generic IRQs don't currently support interrupt controllers on
29 * interrupt driven buses we don't use genirq but instead provide an
30 * interface that looks very much like the standard ones. This leads
31 * to some bodges, including storing interrupt handler information in
32 * the static irq_data table we use to look up the data for individual
33 * interrupts, but hopefully won't last too long.
34 */
35
36struct wm831x_irq_data {
37 int primary;
38 int reg;
39 int mask;
40 irq_handler_t handler;
41 void *handler_data;
42};
43
44static struct wm831x_irq_data wm831x_irqs[] = {
45 [WM831X_IRQ_TEMP_THW] = {
46 .primary = WM831X_TEMP_INT,
47 .reg = 1,
48 .mask = WM831X_TEMP_THW_EINT,
49 },
50 [WM831X_IRQ_GPIO_1] = {
51 .primary = WM831X_GP_INT,
52 .reg = 5,
53 .mask = WM831X_GP1_EINT,
54 },
55 [WM831X_IRQ_GPIO_2] = {
56 .primary = WM831X_GP_INT,
57 .reg = 5,
58 .mask = WM831X_GP2_EINT,
59 },
60 [WM831X_IRQ_GPIO_3] = {
61 .primary = WM831X_GP_INT,
62 .reg = 5,
63 .mask = WM831X_GP3_EINT,
64 },
65 [WM831X_IRQ_GPIO_4] = {
66 .primary = WM831X_GP_INT,
67 .reg = 5,
68 .mask = WM831X_GP4_EINT,
69 },
70 [WM831X_IRQ_GPIO_5] = {
71 .primary = WM831X_GP_INT,
72 .reg = 5,
73 .mask = WM831X_GP5_EINT,
74 },
75 [WM831X_IRQ_GPIO_6] = {
76 .primary = WM831X_GP_INT,
77 .reg = 5,
78 .mask = WM831X_GP6_EINT,
79 },
80 [WM831X_IRQ_GPIO_7] = {
81 .primary = WM831X_GP_INT,
82 .reg = 5,
83 .mask = WM831X_GP7_EINT,
84 },
85 [WM831X_IRQ_GPIO_8] = {
86 .primary = WM831X_GP_INT,
87 .reg = 5,
88 .mask = WM831X_GP8_EINT,
89 },
90 [WM831X_IRQ_GPIO_9] = {
91 .primary = WM831X_GP_INT,
92 .reg = 5,
93 .mask = WM831X_GP9_EINT,
94 },
95 [WM831X_IRQ_GPIO_10] = {
96 .primary = WM831X_GP_INT,
97 .reg = 5,
98 .mask = WM831X_GP10_EINT,
99 },
100 [WM831X_IRQ_GPIO_11] = {
101 .primary = WM831X_GP_INT,
102 .reg = 5,
103 .mask = WM831X_GP11_EINT,
104 },
105 [WM831X_IRQ_GPIO_12] = {
106 .primary = WM831X_GP_INT,
107 .reg = 5,
108 .mask = WM831X_GP12_EINT,
109 },
110 [WM831X_IRQ_GPIO_13] = {
111 .primary = WM831X_GP_INT,
112 .reg = 5,
113 .mask = WM831X_GP13_EINT,
114 },
115 [WM831X_IRQ_GPIO_14] = {
116 .primary = WM831X_GP_INT,
117 .reg = 5,
118 .mask = WM831X_GP14_EINT,
119 },
120 [WM831X_IRQ_GPIO_15] = {
121 .primary = WM831X_GP_INT,
122 .reg = 5,
123 .mask = WM831X_GP15_EINT,
124 },
125 [WM831X_IRQ_GPIO_16] = {
126 .primary = WM831X_GP_INT,
127 .reg = 5,
128 .mask = WM831X_GP16_EINT,
129 },
130 [WM831X_IRQ_ON] = {
131 .primary = WM831X_ON_PIN_INT,
132 .reg = 1,
133 .mask = WM831X_ON_PIN_EINT,
134 },
135 [WM831X_IRQ_PPM_SYSLO] = {
136 .primary = WM831X_PPM_INT,
137 .reg = 1,
138 .mask = WM831X_PPM_SYSLO_EINT,
139 },
140 [WM831X_IRQ_PPM_PWR_SRC] = {
141 .primary = WM831X_PPM_INT,
142 .reg = 1,
143 .mask = WM831X_PPM_PWR_SRC_EINT,
144 },
145 [WM831X_IRQ_PPM_USB_CURR] = {
146 .primary = WM831X_PPM_INT,
147 .reg = 1,
148 .mask = WM831X_PPM_USB_CURR_EINT,
149 },
150 [WM831X_IRQ_WDOG_TO] = {
151 .primary = WM831X_WDOG_INT,
152 .reg = 1,
153 .mask = WM831X_WDOG_TO_EINT,
154 },
155 [WM831X_IRQ_RTC_PER] = {
156 .primary = WM831X_RTC_INT,
157 .reg = 1,
158 .mask = WM831X_RTC_PER_EINT,
159 },
160 [WM831X_IRQ_RTC_ALM] = {
161 .primary = WM831X_RTC_INT,
162 .reg = 1,
163 .mask = WM831X_RTC_ALM_EINT,
164 },
165 [WM831X_IRQ_CHG_BATT_HOT] = {
166 .primary = WM831X_CHG_INT,
167 .reg = 2,
168 .mask = WM831X_CHG_BATT_HOT_EINT,
169 },
170 [WM831X_IRQ_CHG_BATT_COLD] = {
171 .primary = WM831X_CHG_INT,
172 .reg = 2,
173 .mask = WM831X_CHG_BATT_COLD_EINT,
174 },
175 [WM831X_IRQ_CHG_BATT_FAIL] = {
176 .primary = WM831X_CHG_INT,
177 .reg = 2,
178 .mask = WM831X_CHG_BATT_FAIL_EINT,
179 },
180 [WM831X_IRQ_CHG_OV] = {
181 .primary = WM831X_CHG_INT,
182 .reg = 2,
183 .mask = WM831X_CHG_OV_EINT,
184 },
185 [WM831X_IRQ_CHG_END] = {
186 .primary = WM831X_CHG_INT,
187 .reg = 2,
188 .mask = WM831X_CHG_END_EINT,
189 },
190 [WM831X_IRQ_CHG_TO] = {
191 .primary = WM831X_CHG_INT,
192 .reg = 2,
193 .mask = WM831X_CHG_TO_EINT,
194 },
195 [WM831X_IRQ_CHG_MODE] = {
196 .primary = WM831X_CHG_INT,
197 .reg = 2,
198 .mask = WM831X_CHG_MODE_EINT,
199 },
200 [WM831X_IRQ_CHG_START] = {
201 .primary = WM831X_CHG_INT,
202 .reg = 2,
203 .mask = WM831X_CHG_START_EINT,
204 },
205 [WM831X_IRQ_TCHDATA] = {
206 .primary = WM831X_TCHDATA_INT,
207 .reg = 1,
208 .mask = WM831X_TCHDATA_EINT,
209 },
210 [WM831X_IRQ_TCHPD] = {
211 .primary = WM831X_TCHPD_INT,
212 .reg = 1,
213 .mask = WM831X_TCHPD_EINT,
214 },
215 [WM831X_IRQ_AUXADC_DATA] = {
216 .primary = WM831X_AUXADC_INT,
217 .reg = 1,
218 .mask = WM831X_AUXADC_DATA_EINT,
219 },
220 [WM831X_IRQ_AUXADC_DCOMP1] = {
221 .primary = WM831X_AUXADC_INT,
222 .reg = 1,
223 .mask = WM831X_AUXADC_DCOMP1_EINT,
224 },
225 [WM831X_IRQ_AUXADC_DCOMP2] = {
226 .primary = WM831X_AUXADC_INT,
227 .reg = 1,
228 .mask = WM831X_AUXADC_DCOMP2_EINT,
229 },
230 [WM831X_IRQ_AUXADC_DCOMP3] = {
231 .primary = WM831X_AUXADC_INT,
232 .reg = 1,
233 .mask = WM831X_AUXADC_DCOMP3_EINT,
234 },
235 [WM831X_IRQ_AUXADC_DCOMP4] = {
236 .primary = WM831X_AUXADC_INT,
237 .reg = 1,
238 .mask = WM831X_AUXADC_DCOMP4_EINT,
239 },
240 [WM831X_IRQ_CS1] = {
241 .primary = WM831X_CS_INT,
242 .reg = 2,
243 .mask = WM831X_CS1_EINT,
244 },
245 [WM831X_IRQ_CS2] = {
246 .primary = WM831X_CS_INT,
247 .reg = 2,
248 .mask = WM831X_CS2_EINT,
249 },
250 [WM831X_IRQ_HC_DC1] = {
251 .primary = WM831X_HC_INT,
252 .reg = 4,
253 .mask = WM831X_HC_DC1_EINT,
254 },
255 [WM831X_IRQ_HC_DC2] = {
256 .primary = WM831X_HC_INT,
257 .reg = 4,
258 .mask = WM831X_HC_DC2_EINT,
259 },
260 [WM831X_IRQ_UV_LDO1] = {
261 .primary = WM831X_UV_INT,
262 .reg = 3,
263 .mask = WM831X_UV_LDO1_EINT,
264 },
265 [WM831X_IRQ_UV_LDO2] = {
266 .primary = WM831X_UV_INT,
267 .reg = 3,
268 .mask = WM831X_UV_LDO2_EINT,
269 },
270 [WM831X_IRQ_UV_LDO3] = {
271 .primary = WM831X_UV_INT,
272 .reg = 3,
273 .mask = WM831X_UV_LDO3_EINT,
274 },
275 [WM831X_IRQ_UV_LDO4] = {
276 .primary = WM831X_UV_INT,
277 .reg = 3,
278 .mask = WM831X_UV_LDO4_EINT,
279 },
280 [WM831X_IRQ_UV_LDO5] = {
281 .primary = WM831X_UV_INT,
282 .reg = 3,
283 .mask = WM831X_UV_LDO5_EINT,
284 },
285 [WM831X_IRQ_UV_LDO6] = {
286 .primary = WM831X_UV_INT,
287 .reg = 3,
288 .mask = WM831X_UV_LDO6_EINT,
289 },
290 [WM831X_IRQ_UV_LDO7] = {
291 .primary = WM831X_UV_INT,
292 .reg = 3,
293 .mask = WM831X_UV_LDO7_EINT,
294 },
295 [WM831X_IRQ_UV_LDO8] = {
296 .primary = WM831X_UV_INT,
297 .reg = 3,
298 .mask = WM831X_UV_LDO8_EINT,
299 },
300 [WM831X_IRQ_UV_LDO9] = {
301 .primary = WM831X_UV_INT,
302 .reg = 3,
303 .mask = WM831X_UV_LDO9_EINT,
304 },
305 [WM831X_IRQ_UV_LDO10] = {
306 .primary = WM831X_UV_INT,
307 .reg = 3,
308 .mask = WM831X_UV_LDO10_EINT,
309 },
310 [WM831X_IRQ_UV_DC1] = {
311 .primary = WM831X_UV_INT,
312 .reg = 4,
313 .mask = WM831X_UV_DC1_EINT,
314 },
315 [WM831X_IRQ_UV_DC2] = {
316 .primary = WM831X_UV_INT,
317 .reg = 4,
318 .mask = WM831X_UV_DC2_EINT,
319 },
320 [WM831X_IRQ_UV_DC3] = {
321 .primary = WM831X_UV_INT,
322 .reg = 4,
323 .mask = WM831X_UV_DC3_EINT,
324 },
325 [WM831X_IRQ_UV_DC4] = {
326 .primary = WM831X_UV_INT,
327 .reg = 4,
328 .mask = WM831X_UV_DC4_EINT,
329 },
330};
331
332static inline int irq_data_to_status_reg(struct wm831x_irq_data *irq_data)
333{
334 return WM831X_INTERRUPT_STATUS_1 - 1 + irq_data->reg;
335}
336
337static inline int irq_data_to_mask_reg(struct wm831x_irq_data *irq_data)
338{
339 return WM831X_INTERRUPT_STATUS_1_MASK - 1 + irq_data->reg;
340}
341
342static void __wm831x_enable_irq(struct wm831x *wm831x, int irq)
343{
344 struct wm831x_irq_data *irq_data = &wm831x_irqs[irq];
345
346 wm831x->irq_masks[irq_data->reg - 1] &= ~irq_data->mask;
347 wm831x_reg_write(wm831x, irq_data_to_mask_reg(irq_data),
348 wm831x->irq_masks[irq_data->reg - 1]);
349}
350
351void wm831x_enable_irq(struct wm831x *wm831x, int irq)
352{
353 mutex_lock(&wm831x->irq_lock);
354 __wm831x_enable_irq(wm831x, irq);
355 mutex_unlock(&wm831x->irq_lock);
356}
357EXPORT_SYMBOL_GPL(wm831x_enable_irq);
358
359static void __wm831x_disable_irq(struct wm831x *wm831x, int irq)
360{
361 struct wm831x_irq_data *irq_data = &wm831x_irqs[irq];
362
363 wm831x->irq_masks[irq_data->reg - 1] |= irq_data->mask;
364 wm831x_reg_write(wm831x, irq_data_to_mask_reg(irq_data),
365 wm831x->irq_masks[irq_data->reg - 1]);
366}
367
368void wm831x_disable_irq(struct wm831x *wm831x, int irq)
369{
370 mutex_lock(&wm831x->irq_lock);
371 __wm831x_disable_irq(wm831x, irq);
372 mutex_unlock(&wm831x->irq_lock);
373}
374EXPORT_SYMBOL_GPL(wm831x_disable_irq);
375
376int wm831x_request_irq(struct wm831x *wm831x,
377 unsigned int irq, irq_handler_t handler,
378 unsigned long flags, const char *name,
379 void *dev)
380{
381 int ret = 0;
382
383 if (irq < 0 || irq >= WM831X_NUM_IRQS)
384 return -EINVAL;
385
386 mutex_lock(&wm831x->irq_lock);
387
388 if (wm831x_irqs[irq].handler) {
389 dev_err(wm831x->dev, "Already have handler for IRQ %d\n", irq);
390 ret = -EINVAL;
391 goto out;
392 }
393
394 wm831x_irqs[irq].handler = handler;
395 wm831x_irqs[irq].handler_data = dev;
396
397 __wm831x_enable_irq(wm831x, irq);
398
399out:
400 mutex_unlock(&wm831x->irq_lock);
401
402 return ret;
403}
404EXPORT_SYMBOL_GPL(wm831x_request_irq);
405
406void wm831x_free_irq(struct wm831x *wm831x, unsigned int irq, void *data)
407{
408 if (irq < 0 || irq >= WM831X_NUM_IRQS)
409 return;
410
411 mutex_lock(&wm831x->irq_lock);
412
413 wm831x_irqs[irq].handler = NULL;
414 wm831x_irqs[irq].handler_data = NULL;
415
416 __wm831x_disable_irq(wm831x, irq);
417
418 mutex_unlock(&wm831x->irq_lock);
419}
420EXPORT_SYMBOL_GPL(wm831x_free_irq);
421
422
423static void wm831x_handle_irq(struct wm831x *wm831x, int irq, int status)
424{
425 struct wm831x_irq_data *irq_data = &wm831x_irqs[irq];
426
427 if (irq_data->handler) {
428 irq_data->handler(irq, irq_data->handler_data);
429 wm831x_reg_write(wm831x, irq_data_to_status_reg(irq_data),
430 irq_data->mask);
431 } else {
432 dev_err(wm831x->dev, "Unhandled IRQ %d, masking\n", irq);
433 __wm831x_disable_irq(wm831x, irq);
434 }
435}
436
437/* Main interrupt handling occurs in a workqueue since we need
438 * interrupts enabled to interact with the chip. */
439static void wm831x_irq_worker(struct work_struct *work)
440{
441 struct wm831x *wm831x = container_of(work, struct wm831x, irq_work);
442 unsigned int i;
443 int primary;
444 int status_regs[5];
445 int read[5] = { 0 };
446 int *status;
447
448 primary = wm831x_reg_read(wm831x, WM831X_SYSTEM_INTERRUPTS);
449 if (primary < 0) {
450 dev_err(wm831x->dev, "Failed to read system interrupt: %d\n",
451 primary);
452 goto out;
453 }
454
455 mutex_lock(&wm831x->irq_lock);
456
457 for (i = 0; i < ARRAY_SIZE(wm831x_irqs); i++) {
458 int offset = wm831x_irqs[i].reg - 1;
459
460 if (!(primary & wm831x_irqs[i].primary))
461 continue;
462
463 status = &status_regs[offset];
464
465 /* Hopefully there should only be one register to read
466 * each time otherwise we ought to do a block read. */
467 if (!read[offset]) {
468 *status = wm831x_reg_read(wm831x,
469 irq_data_to_status_reg(&wm831x_irqs[i]));
470 if (*status < 0) {
471 dev_err(wm831x->dev,
472 "Failed to read IRQ status: %d\n",
473 *status);
474 goto out_lock;
475 }
476
477 /* Mask out the disabled IRQs */
478 *status &= ~wm831x->irq_masks[offset];
479 read[offset] = 1;
480 }
481
482 if (*status & wm831x_irqs[i].mask)
483 wm831x_handle_irq(wm831x, i, *status);
484 }
485
486out_lock:
487 mutex_unlock(&wm831x->irq_lock);
488out:
489 enable_irq(wm831x->irq);
490}
491
492
493static irqreturn_t wm831x_cpu_irq(int irq, void *data)
494{
495 struct wm831x *wm831x = data;
496
497 /* Shut the interrupt to the CPU up and schedule the actual
498 * handler; we can't check that the IRQ is asserted. */
499 disable_irq_nosync(irq);
500
501 queue_work(wm831x->irq_wq, &wm831x->irq_work);
502
503 return IRQ_HANDLED;
504}
505
506int wm831x_irq_init(struct wm831x *wm831x, int irq)
507{
508 int i, ret;
509
510 if (!irq) {
511 dev_warn(wm831x->dev,
512 "No interrupt specified - functionality limited\n");
513 return 0;
514 }
515
516
517 wm831x->irq_wq = create_singlethread_workqueue("wm831x-irq");
518 if (!wm831x->irq_wq) {
519 dev_err(wm831x->dev, "Failed to allocate IRQ worker\n");
520 return -ESRCH;
521 }
522
523 wm831x->irq = irq;
524 mutex_init(&wm831x->irq_lock);
525 INIT_WORK(&wm831x->irq_work, wm831x_irq_worker);
526
527 /* Mask the individual interrupt sources */
528 for (i = 0; i < ARRAY_SIZE(wm831x->irq_masks); i++) {
529 wm831x->irq_masks[i] = 0xffff;
530 wm831x_reg_write(wm831x, WM831X_INTERRUPT_STATUS_1_MASK + i,
531 0xffff);
532 }
533
534 /* Enable top level interrupts, we mask at secondary level */
535 wm831x_reg_write(wm831x, WM831X_SYSTEM_INTERRUPTS_MASK, 0);
536
537 /* We're good to go. We set IRQF_SHARED since there's a
538 * chance the driver will interoperate with another driver but
539 * the need to disable the IRQ while handing via I2C/SPI means
540 * that this may break and performance will be impacted. If
541 * this does happen it's a hardware design issue and the only
542 * other alternative would be polling.
543 */
544 ret = request_irq(irq, wm831x_cpu_irq, IRQF_TRIGGER_LOW | IRQF_SHARED,
545 "wm831x", wm831x);
546 if (ret != 0) {
547 dev_err(wm831x->dev, "Failed to request IRQ %d: %d\n",
548 irq, ret);
549 return ret;
550 }
551
552 return 0;
553}
554
555void wm831x_irq_exit(struct wm831x *wm831x)
556{
557 if (wm831x->irq)
558 free_irq(wm831x->irq, wm831x);
559}