[ALSA] aoa: add locking to tas codec
[linux-2.6.git] / sound / aoa / core / snd-aoa-gpio-feature.c
1 /*
2  * Apple Onboard Audio feature call GPIO control
3  *
4  * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
5  *
6  * GPL v2, can be found in COPYING.
7  *
8  * This file contains the GPIO control routines for 
9  * direct (through feature calls) access to the GPIO
10  * registers.
11  */
12
13 #include <asm/pmac_feature.h>
14 #include <linux/interrupt.h>
15 #include "../aoa.h"
16
17 /* TODO: these are 20 global variables
18  * that aren't used on most machines...
19  * Move them into a dynamically allocated
20  * structure and use that.
21  */
22
23 /* these are the GPIO numbers (register addresses as offsets into
24  * the GPIO space) */
25 static int headphone_mute_gpio;
26 static int amp_mute_gpio;
27 static int lineout_mute_gpio;
28 static int hw_reset_gpio;
29 static int lineout_detect_gpio;
30 static int headphone_detect_gpio;
31 static int linein_detect_gpio;
32
33 /* see the SWITCH_GPIO macro */
34 static int headphone_mute_gpio_activestate;
35 static int amp_mute_gpio_activestate;
36 static int lineout_mute_gpio_activestate;
37 static int hw_reset_gpio_activestate;
38 static int lineout_detect_gpio_activestate;
39 static int headphone_detect_gpio_activestate;
40 static int linein_detect_gpio_activestate;
41
42 /* node pointers that we save when getting the GPIO number
43  * to get the interrupt later */
44 static struct device_node *lineout_detect_node;
45 static struct device_node *linein_detect_node;
46 static struct device_node *headphone_detect_node;
47
48 static int lineout_detect_irq;
49 static int linein_detect_irq;
50 static int headphone_detect_irq;
51
52 static struct device_node *get_gpio(char *name,
53                                     char *altname,
54                                     int *gpioptr,
55                                     int *gpioactiveptr)
56 {
57         struct device_node *np, *gpio;
58         u32 *reg;
59         const char *audio_gpio;
60
61         *gpioptr = -1;
62
63         /* check if we can get it the easy way ... */
64         np = of_find_node_by_name(NULL, name);
65         if (!np) {
66                 /* some machines have only gpioX/extint-gpioX nodes,
67                  * and an audio-gpio property saying what it is ...
68                  * So what we have to do is enumerate all children
69                  * of the gpio node and check them all. */
70                 gpio = of_find_node_by_name(NULL, "gpio");
71                 if (!gpio)
72                         return NULL;
73                 while ((np = of_get_next_child(gpio, np))) {
74                         audio_gpio = get_property(np, "audio-gpio", NULL);
75                         if (!audio_gpio)
76                                 continue;
77                         if (strcmp(audio_gpio, name) == 0)
78                                 break;
79                         if (altname && (strcmp(audio_gpio, altname) == 0))
80                                 break;
81                 }
82                 /* still not found, assume not there */
83                 if (!np)
84                         return NULL;
85         }
86
87         reg = (u32 *)get_property(np, "reg", NULL);
88         if (!reg)
89                 return NULL;
90
91         *gpioptr = *reg;
92
93         /* this is a hack, usually the GPIOs 'reg' property
94          * should have the offset based from the GPIO space
95          * which is at 0x50, but apparently not always... */
96         if (*gpioptr < 0x50)
97                 *gpioptr += 0x50;
98
99         reg = (u32 *)get_property(np, "audio-gpio-active-state", NULL);
100         if (!reg)
101                 /* Apple seems to default to 1, but
102                  * that doesn't seem right at least on most
103                  * machines. So until proven that the opposite
104                  * is necessary, we default to 0
105                  * (which, incidentally, snd-powermac also does...) */
106                 *gpioactiveptr = 0;
107         else
108                 *gpioactiveptr = *reg;
109
110         return np;
111 }
112
113 static void get_irq(struct device_node * np, int *irqptr)
114 {
115         if (np)
116                 *irqptr = irq_of_parse_and_map(np, 0);
117         else
118                 *irqptr = NO_IRQ;
119 }
120
121 /* 0x4 is outenable, 0x1 is out, thus 4 or 5 */
122 #define SWITCH_GPIO(name, v, on)                                \
123         (((v)&~1) | ((on)?                                      \
124                         (name##_gpio_activestate==0?4:5):       \
125                         (name##_gpio_activestate==0?5:4)))
126
127 #define FTR_GPIO(name, bit)                                     \
128 static void ftr_gpio_set_##name(struct gpio_runtime *rt, int on)\
129 {                                                               \
130         int v;                                                  \
131                                                                 \
132         if (unlikely(!rt)) return;                              \
133                                                                 \
134         if (name##_mute_gpio < 0)                               \
135                 return;                                         \
136                                                                 \
137         v = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL,         \
138                               name##_mute_gpio,                 \
139                               0);                               \
140                                                                 \
141         /* muted = !on... */                                    \
142         v = SWITCH_GPIO(name##_mute, v, !on);                   \
143                                                                 \
144         pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL,            \
145                           name##_mute_gpio, v);                 \
146                                                                 \
147         rt->implementation_private &= ~(1<<bit);                \
148         rt->implementation_private |= (!!on << bit);            \
149 }                                                               \
150 static int ftr_gpio_get_##name(struct gpio_runtime *rt)         \
151 {                                                               \
152         if (unlikely(!rt)) return 0;                            \
153         return (rt->implementation_private>>bit)&1;             \
154 }
155
156 FTR_GPIO(headphone, 0);
157 FTR_GPIO(amp, 1);
158 FTR_GPIO(lineout, 2);
159
160 static void ftr_gpio_set_hw_reset(struct gpio_runtime *rt, int on)
161 {
162         int v;
163
164         if (unlikely(!rt)) return;
165         if (hw_reset_gpio < 0)
166                 return;
167
168         v = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL,
169                               hw_reset_gpio, 0);
170         v = SWITCH_GPIO(hw_reset, v, on);
171         pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL,
172                           hw_reset_gpio, v);
173 }
174
175 static void ftr_gpio_all_amps_off(struct gpio_runtime *rt)
176 {
177         int saved;
178
179         if (unlikely(!rt)) return;
180         saved = rt->implementation_private;
181         ftr_gpio_set_headphone(rt, 0);
182         ftr_gpio_set_amp(rt, 0);
183         ftr_gpio_set_lineout(rt, 0);
184         rt->implementation_private = saved;
185 }
186
187 static void ftr_gpio_all_amps_restore(struct gpio_runtime *rt)
188 {
189         int s;
190
191         if (unlikely(!rt)) return;
192         s = rt->implementation_private;
193         ftr_gpio_set_headphone(rt, (s>>0)&1);
194         ftr_gpio_set_amp(rt, (s>>1)&1);
195         ftr_gpio_set_lineout(rt, (s>>2)&1);
196 }
197
198 static void ftr_handle_notify(void *data)
199 {
200         struct gpio_notification *notif = data;
201
202         mutex_lock(&notif->mutex);
203         if (notif->notify)
204                 notif->notify(notif->data);
205         mutex_unlock(&notif->mutex);
206 }
207
208 static void gpio_enable_dual_edge(int gpio)
209 {
210         int v;
211
212         if (gpio == -1)
213                 return;
214         v = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, gpio, 0);
215         v |= 0x80; /* enable dual edge */
216         pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, gpio, v);
217 }
218
219 static void ftr_gpio_init(struct gpio_runtime *rt)
220 {
221         get_gpio("headphone-mute", NULL,
222                  &headphone_mute_gpio,
223                  &headphone_mute_gpio_activestate);
224         get_gpio("amp-mute", NULL,
225                  &amp_mute_gpio,
226                  &amp_mute_gpio_activestate);
227         get_gpio("lineout-mute", NULL,
228                  &lineout_mute_gpio,
229                  &lineout_mute_gpio_activestate);
230         get_gpio("hw-reset", "audio-hw-reset",
231                  &hw_reset_gpio,
232                  &hw_reset_gpio_activestate);
233
234         headphone_detect_node = get_gpio("headphone-detect", NULL,
235                                          &headphone_detect_gpio,
236                                          &headphone_detect_gpio_activestate);
237         /* go Apple, and thanks for giving these different names
238          * across the board... */
239         lineout_detect_node = get_gpio("lineout-detect", "line-output-detect",
240                                        &lineout_detect_gpio,
241                                        &lineout_detect_gpio_activestate);
242         linein_detect_node = get_gpio("linein-detect", "line-input-detect",
243                                       &linein_detect_gpio,
244                                       &linein_detect_gpio_activestate);
245
246         gpio_enable_dual_edge(headphone_detect_gpio);
247         gpio_enable_dual_edge(lineout_detect_gpio);
248         gpio_enable_dual_edge(linein_detect_gpio);
249
250         get_irq(headphone_detect_node, &headphone_detect_irq);
251         get_irq(lineout_detect_node, &lineout_detect_irq);
252         get_irq(linein_detect_node, &linein_detect_irq);
253
254         ftr_gpio_all_amps_off(rt);
255         rt->implementation_private = 0;
256         INIT_WORK(&rt->headphone_notify.work, ftr_handle_notify,
257                   &rt->headphone_notify);
258         INIT_WORK(&rt->line_in_notify.work, ftr_handle_notify,
259                   &rt->line_in_notify);
260         INIT_WORK(&rt->line_out_notify.work, ftr_handle_notify,
261                   &rt->line_out_notify);
262         mutex_init(&rt->headphone_notify.mutex);
263         mutex_init(&rt->line_in_notify.mutex);
264         mutex_init(&rt->line_out_notify.mutex);
265 }
266
267 static void ftr_gpio_exit(struct gpio_runtime *rt)
268 {
269         ftr_gpio_all_amps_off(rt);
270         rt->implementation_private = 0;
271         if (rt->headphone_notify.notify)
272                 free_irq(headphone_detect_irq, &rt->headphone_notify);
273         if (rt->line_in_notify.gpio_private)
274                 free_irq(linein_detect_irq, &rt->line_in_notify);
275         if (rt->line_out_notify.gpio_private)
276                 free_irq(lineout_detect_irq, &rt->line_out_notify);
277         cancel_delayed_work(&rt->headphone_notify.work);
278         cancel_delayed_work(&rt->line_in_notify.work);
279         cancel_delayed_work(&rt->line_out_notify.work);
280         flush_scheduled_work();
281         mutex_destroy(&rt->headphone_notify.mutex);
282         mutex_destroy(&rt->line_in_notify.mutex);
283         mutex_destroy(&rt->line_out_notify.mutex);
284 }
285
286 static irqreturn_t ftr_handle_notify_irq(int xx,
287                                          void *data,
288                                          struct pt_regs *regs)
289 {
290         struct gpio_notification *notif = data;
291
292         schedule_work(&notif->work);
293
294         return IRQ_HANDLED;
295 }
296
297 static int ftr_set_notify(struct gpio_runtime *rt,
298                           enum notify_type type,
299                           notify_func_t notify,
300                           void *data)
301 {
302         struct gpio_notification *notif;
303         notify_func_t old;
304         int irq;
305         char *name;
306         int err = -EBUSY;
307
308         switch (type) {
309         case AOA_NOTIFY_HEADPHONE:
310                 notif = &rt->headphone_notify;
311                 name = "headphone-detect";
312                 irq = headphone_detect_irq;
313                 break;
314         case AOA_NOTIFY_LINE_IN:
315                 notif = &rt->line_in_notify;
316                 name = "linein-detect";
317                 irq = linein_detect_irq;
318                 break;
319         case AOA_NOTIFY_LINE_OUT:
320                 notif = &rt->line_out_notify;
321                 name = "lineout-detect";
322                 irq = lineout_detect_irq;
323                 break;
324         default:
325                 return -EINVAL;
326         }
327
328         if (irq == NO_IRQ)
329                 return -ENODEV;
330
331         mutex_lock(&notif->mutex);
332
333         old = notif->notify;
334
335         if (!old && !notify) {
336                 err = 0;
337                 goto out_unlock;
338         }
339
340         if (old && notify) {
341                 if (old == notify && notif->data == data)
342                         err = 0;
343                 goto out_unlock;
344         }
345
346         if (old && !notify)
347                 free_irq(irq, notif);
348
349         if (!old && notify) {
350                 err = request_irq(irq, ftr_handle_notify_irq, 0, name, notif);
351                 if (err)
352                         goto out_unlock;
353         }
354
355         notif->notify = notify;
356         notif->data = data;
357
358         err = 0;
359  out_unlock:
360         mutex_unlock(&notif->mutex);
361         return err;
362 }
363
364 static int ftr_get_detect(struct gpio_runtime *rt,
365                           enum notify_type type)
366 {
367         int gpio, ret, active;
368
369         switch (type) {
370         case AOA_NOTIFY_HEADPHONE:
371                 gpio = headphone_detect_gpio;
372                 active = headphone_detect_gpio_activestate;
373                 break;
374         case AOA_NOTIFY_LINE_IN:
375                 gpio = linein_detect_gpio;
376                 active = linein_detect_gpio_activestate;
377                 break;
378         case AOA_NOTIFY_LINE_OUT:
379                 gpio = lineout_detect_gpio;
380                 active = lineout_detect_gpio_activestate;
381                 break;
382         default:
383                 return -EINVAL;
384         }
385
386         if (gpio == -1)
387                 return -ENODEV;
388
389         ret = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, gpio, 0);
390         if (ret < 0)
391                 return ret;
392         return ((ret >> 1) & 1) == active;
393 }
394
395 static struct gpio_methods methods = {
396         .init                   = ftr_gpio_init,
397         .exit                   = ftr_gpio_exit,
398         .all_amps_off           = ftr_gpio_all_amps_off,
399         .all_amps_restore       = ftr_gpio_all_amps_restore,
400         .set_headphone          = ftr_gpio_set_headphone,
401         .set_speakers           = ftr_gpio_set_amp,
402         .set_lineout            = ftr_gpio_set_lineout,
403         .set_hw_reset           = ftr_gpio_set_hw_reset,
404         .get_headphone          = ftr_gpio_get_headphone,
405         .get_speakers           = ftr_gpio_get_amp,
406         .get_lineout            = ftr_gpio_get_lineout,
407         .set_notify             = ftr_set_notify,
408         .get_detect             = ftr_get_detect,
409 };
410
411 struct gpio_methods *ftr_gpio_methods = &methods;
412 EXPORT_SYMBOL_GPL(ftr_gpio_methods);