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TOMOYO Linux Cross Reference
Linux/sound/aoa/core/gpio-feature.c

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  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 lots of 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 master_mute_gpio;
 27 static int amp_mute_gpio;
 28 static int lineout_mute_gpio;
 29 static int hw_reset_gpio;
 30 static int lineout_detect_gpio;
 31 static int headphone_detect_gpio;
 32 static int linein_detect_gpio;
 33 
 34 /* see the SWITCH_GPIO macro */
 35 static int headphone_mute_gpio_activestate;
 36 static int master_mute_gpio_activestate;
 37 static int amp_mute_gpio_activestate;
 38 static int lineout_mute_gpio_activestate;
 39 static int hw_reset_gpio_activestate;
 40 static int lineout_detect_gpio_activestate;
 41 static int headphone_detect_gpio_activestate;
 42 static int linein_detect_gpio_activestate;
 43 
 44 /* node pointers that we save when getting the GPIO number
 45  * to get the interrupt later */
 46 static struct device_node *lineout_detect_node;
 47 static struct device_node *linein_detect_node;
 48 static struct device_node *headphone_detect_node;
 49 
 50 static int lineout_detect_irq;
 51 static int linein_detect_irq;
 52 static int headphone_detect_irq;
 53 
 54 static struct device_node *get_gpio(char *name,
 55                                     char *altname,
 56                                     int *gpioptr,
 57                                     int *gpioactiveptr)
 58 {
 59         struct device_node *np, *gpio;
 60         const u32 *reg;
 61         const char *audio_gpio;
 62 
 63         *gpioptr = -1;
 64 
 65         /* check if we can get it the easy way ... */
 66         np = of_find_node_by_name(NULL, name);
 67         if (!np) {
 68                 /* some machines have only gpioX/extint-gpioX nodes,
 69                  * and an audio-gpio property saying what it is ...
 70                  * So what we have to do is enumerate all children
 71                  * of the gpio node and check them all. */
 72                 gpio = of_find_node_by_name(NULL, "gpio");
 73                 if (!gpio)
 74                         return NULL;
 75                 while ((np = of_get_next_child(gpio, np))) {
 76                         audio_gpio = of_get_property(np, "audio-gpio", NULL);
 77                         if (!audio_gpio)
 78                                 continue;
 79                         if (strcmp(audio_gpio, name) == 0)
 80                                 break;
 81                         if (altname && (strcmp(audio_gpio, altname) == 0))
 82                                 break;
 83                 }
 84                 /* still not found, assume not there */
 85                 if (!np)
 86                         return NULL;
 87         }
 88 
 89         reg = of_get_property(np, "reg", NULL);
 90         if (!reg)
 91                 return NULL;
 92 
 93         *gpioptr = *reg;
 94 
 95         /* this is a hack, usually the GPIOs 'reg' property
 96          * should have the offset based from the GPIO space
 97          * which is at 0x50, but apparently not always... */
 98         if (*gpioptr < 0x50)
 99                 *gpioptr += 0x50;
100 
101         reg = of_get_property(np, "audio-gpio-active-state", NULL);
102         if (!reg)
103                 /* Apple seems to default to 1, but
104                  * that doesn't seem right at least on most
105                  * machines. So until proven that the opposite
106                  * is necessary, we default to 0
107                  * (which, incidentally, snd-powermac also does...) */
108                 *gpioactiveptr = 0;
109         else
110                 *gpioactiveptr = *reg;
111 
112         return np;
113 }
114 
115 static void get_irq(struct device_node * np, int *irqptr)
116 {
117         if (np)
118                 *irqptr = irq_of_parse_and_map(np, 0);
119         else
120                 *irqptr = NO_IRQ;
121 }
122 
123 /* 0x4 is outenable, 0x1 is out, thus 4 or 5 */
124 #define SWITCH_GPIO(name, v, on)                                \
125         (((v)&~1) | ((on)?                                      \
126                         (name##_gpio_activestate==0?4:5):       \
127                         (name##_gpio_activestate==0?5:4)))
128 
129 #define FTR_GPIO(name, bit)                                     \
130 static void ftr_gpio_set_##name(struct gpio_runtime *rt, int on)\
131 {                                                               \
132         int v;                                                  \
133                                                                 \
134         if (unlikely(!rt)) return;                              \
135                                                                 \
136         if (name##_mute_gpio < 0)                               \
137                 return;                                         \
138                                                                 \
139         v = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL,         \
140                               name##_mute_gpio,                 \
141                               0);                               \
142                                                                 \
143         /* muted = !on... */                                    \
144         v = SWITCH_GPIO(name##_mute, v, !on);                   \
145                                                                 \
146         pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL,            \
147                           name##_mute_gpio, v);                 \
148                                                                 \
149         rt->implementation_private &= ~(1<<bit);                \
150         rt->implementation_private |= (!!on << bit);            \
151 }                                                               \
152 static int ftr_gpio_get_##name(struct gpio_runtime *rt)         \
153 {                                                               \
154         if (unlikely(!rt)) return 0;                            \
155         return (rt->implementation_private>>bit)&1;             \
156 }
157 
158 FTR_GPIO(headphone, 0);
159 FTR_GPIO(amp, 1);
160 FTR_GPIO(lineout, 2);
161 FTR_GPIO(master, 3);
162 
163 static void ftr_gpio_set_hw_reset(struct gpio_runtime *rt, int on)
164 {
165         int v;
166 
167         if (unlikely(!rt)) return;
168         if (hw_reset_gpio < 0)
169                 return;
170 
171         v = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL,
172                               hw_reset_gpio, 0);
173         v = SWITCH_GPIO(hw_reset, v, on);
174         pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL,
175                           hw_reset_gpio, v);
176 }
177 
178 static struct gpio_methods methods;
179 
180 static void ftr_gpio_all_amps_off(struct gpio_runtime *rt)
181 {
182         int saved;
183 
184         if (unlikely(!rt)) return;
185         saved = rt->implementation_private;
186         ftr_gpio_set_headphone(rt, 0);
187         ftr_gpio_set_amp(rt, 0);
188         ftr_gpio_set_lineout(rt, 0);
189         if (methods.set_master)
190                 ftr_gpio_set_master(rt, 0);
191         rt->implementation_private = saved;
192 }
193 
194 static void ftr_gpio_all_amps_restore(struct gpio_runtime *rt)
195 {
196         int s;
197 
198         if (unlikely(!rt)) return;
199         s = rt->implementation_private;
200         ftr_gpio_set_headphone(rt, (s>>0)&1);
201         ftr_gpio_set_amp(rt, (s>>1)&1);
202         ftr_gpio_set_lineout(rt, (s>>2)&1);
203         if (methods.set_master)
204                 ftr_gpio_set_master(rt, (s>>3)&1);
205 }
206 
207 static void ftr_handle_notify(struct work_struct *work)
208 {
209         struct gpio_notification *notif =
210                 container_of(work, struct gpio_notification, work.work);
211 
212         mutex_lock(&notif->mutex);
213         if (notif->notify)
214                 notif->notify(notif->data);
215         mutex_unlock(&notif->mutex);
216 }
217 
218 static void gpio_enable_dual_edge(int gpio)
219 {
220         int v;
221 
222         if (gpio == -1)
223                 return;
224         v = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, gpio, 0);
225         v |= 0x80; /* enable dual edge */
226         pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, gpio, v);
227 }
228 
229 static void ftr_gpio_init(struct gpio_runtime *rt)
230 {
231         get_gpio("headphone-mute", NULL,
232                  &headphone_mute_gpio,
233                  &headphone_mute_gpio_activestate);
234         get_gpio("amp-mute", NULL,
235                  &amp_mute_gpio,
236                  &amp_mute_gpio_activestate);
237         get_gpio("lineout-mute", NULL,
238                  &lineout_mute_gpio,
239                  &lineout_mute_gpio_activestate);
240         get_gpio("hw-reset", "audio-hw-reset",
241                  &hw_reset_gpio,
242                  &hw_reset_gpio_activestate);
243         if (get_gpio("master-mute", NULL,
244                      &master_mute_gpio,
245                      &master_mute_gpio_activestate)) {
246                 methods.set_master = ftr_gpio_set_master;
247                 methods.get_master = ftr_gpio_get_master;
248         }
249 
250         headphone_detect_node = get_gpio("headphone-detect", NULL,
251                                          &headphone_detect_gpio,
252                                          &headphone_detect_gpio_activestate);
253         /* go Apple, and thanks for giving these different names
254          * across the board... */
255         lineout_detect_node = get_gpio("lineout-detect", "line-output-detect",
256                                        &lineout_detect_gpio,
257                                        &lineout_detect_gpio_activestate);
258         linein_detect_node = get_gpio("linein-detect", "line-input-detect",
259                                       &linein_detect_gpio,
260                                       &linein_detect_gpio_activestate);
261 
262         gpio_enable_dual_edge(headphone_detect_gpio);
263         gpio_enable_dual_edge(lineout_detect_gpio);
264         gpio_enable_dual_edge(linein_detect_gpio);
265 
266         get_irq(headphone_detect_node, &headphone_detect_irq);
267         get_irq(lineout_detect_node, &lineout_detect_irq);
268         get_irq(linein_detect_node, &linein_detect_irq);
269 
270         ftr_gpio_all_amps_off(rt);
271         rt->implementation_private = 0;
272         INIT_DELAYED_WORK(&rt->headphone_notify.work, ftr_handle_notify);
273         INIT_DELAYED_WORK(&rt->line_in_notify.work, ftr_handle_notify);
274         INIT_DELAYED_WORK(&rt->line_out_notify.work, ftr_handle_notify);
275         mutex_init(&rt->headphone_notify.mutex);
276         mutex_init(&rt->line_in_notify.mutex);
277         mutex_init(&rt->line_out_notify.mutex);
278 }
279 
280 static void ftr_gpio_exit(struct gpio_runtime *rt)
281 {
282         ftr_gpio_all_amps_off(rt);
283         rt->implementation_private = 0;
284         if (rt->headphone_notify.notify)
285                 free_irq(headphone_detect_irq, &rt->headphone_notify);
286         if (rt->line_in_notify.gpio_private)
287                 free_irq(linein_detect_irq, &rt->line_in_notify);
288         if (rt->line_out_notify.gpio_private)
289                 free_irq(lineout_detect_irq, &rt->line_out_notify);
290         cancel_delayed_work(&rt->headphone_notify.work);
291         cancel_delayed_work(&rt->line_in_notify.work);
292         cancel_delayed_work(&rt->line_out_notify.work);
293         flush_scheduled_work();
294         mutex_destroy(&rt->headphone_notify.mutex);
295         mutex_destroy(&rt->line_in_notify.mutex);
296         mutex_destroy(&rt->line_out_notify.mutex);
297 }
298 
299 static irqreturn_t ftr_handle_notify_irq(int xx, void *data)
300 {
301         struct gpio_notification *notif = data;
302 
303         schedule_delayed_work(&notif->work, 0);
304 
305         return IRQ_HANDLED;
306 }
307 
308 static int ftr_set_notify(struct gpio_runtime *rt,
309                           enum notify_type type,
310                           notify_func_t notify,
311                           void *data)
312 {
313         struct gpio_notification *notif;
314         notify_func_t old;
315         int irq;
316         char *name;
317         int err = -EBUSY;
318 
319         switch (type) {
320         case AOA_NOTIFY_HEADPHONE:
321                 notif = &rt->headphone_notify;
322                 name = "headphone-detect";
323                 irq = headphone_detect_irq;
324                 break;
325         case AOA_NOTIFY_LINE_IN:
326                 notif = &rt->line_in_notify;
327                 name = "linein-detect";
328                 irq = linein_detect_irq;
329                 break;
330         case AOA_NOTIFY_LINE_OUT:
331                 notif = &rt->line_out_notify;
332                 name = "lineout-detect";
333                 irq = lineout_detect_irq;
334                 break;
335         default:
336                 return -EINVAL;
337         }
338 
339         if (irq == NO_IRQ)
340                 return -ENODEV;
341 
342         mutex_lock(&notif->mutex);
343 
344         old = notif->notify;
345 
346         if (!old && !notify) {
347                 err = 0;
348                 goto out_unlock;
349         }
350 
351         if (old && notify) {
352                 if (old == notify && notif->data == data)
353                         err = 0;
354                 goto out_unlock;
355         }
356 
357         if (old && !notify)
358                 free_irq(irq, notif);
359 
360         if (!old && notify) {
361                 err = request_irq(irq, ftr_handle_notify_irq, 0, name, notif);
362                 if (err)
363                         goto out_unlock;
364         }
365 
366         notif->notify = notify;
367         notif->data = data;
368 
369         err = 0;
370  out_unlock:
371         mutex_unlock(&notif->mutex);
372         return err;
373 }
374 
375 static int ftr_get_detect(struct gpio_runtime *rt,
376                           enum notify_type type)
377 {
378         int gpio, ret, active;
379 
380         switch (type) {
381         case AOA_NOTIFY_HEADPHONE:
382                 gpio = headphone_detect_gpio;
383                 active = headphone_detect_gpio_activestate;
384                 break;
385         case AOA_NOTIFY_LINE_IN:
386                 gpio = linein_detect_gpio;
387                 active = linein_detect_gpio_activestate;
388                 break;
389         case AOA_NOTIFY_LINE_OUT:
390                 gpio = lineout_detect_gpio;
391                 active = lineout_detect_gpio_activestate;
392                 break;
393         default:
394                 return -EINVAL;
395         }
396 
397         if (gpio == -1)
398                 return -ENODEV;
399 
400         ret = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, gpio, 0);
401         if (ret < 0)
402                 return ret;
403         return ((ret >> 1) & 1) == active;
404 }
405 
406 static struct gpio_methods methods = {
407         .init                   = ftr_gpio_init,
408         .exit                   = ftr_gpio_exit,
409         .all_amps_off           = ftr_gpio_all_amps_off,
410         .all_amps_restore       = ftr_gpio_all_amps_restore,
411         .set_headphone          = ftr_gpio_set_headphone,
412         .set_speakers           = ftr_gpio_set_amp,
413         .set_lineout            = ftr_gpio_set_lineout,
414         .set_hw_reset           = ftr_gpio_set_hw_reset,
415         .get_headphone          = ftr_gpio_get_headphone,
416         .get_speakers           = ftr_gpio_get_amp,
417         .get_lineout            = ftr_gpio_get_lineout,
418         .set_notify             = ftr_set_notify,
419         .get_detect             = ftr_get_detect,
420 };
421 
422 struct gpio_methods *ftr_gpio_methods = &methods;
423 EXPORT_SYMBOL_GPL(ftr_gpio_methods);
424 

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