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
get_gpio(char * name,char * altname,int * gpioptr,int * gpioactiveptr)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 const 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 = of_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 = of_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 = of_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
get_irq(struct device_node * np,int * irqptr)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
ftr_gpio_set_hw_reset(struct gpio_runtime * rt,int on)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
ftr_gpio_all_amps_off(struct gpio_runtime * rt)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
ftr_gpio_all_amps_restore(struct gpio_runtime * rt)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
ftr_handle_notify(struct work_struct * work)198 static void ftr_handle_notify(struct work_struct *work)
199 {
200 struct gpio_notification *notif =
201 container_of(work, struct gpio_notification, work.work);
202
203 mutex_lock(¬if->mutex);
204 if (notif->notify)
205 notif->notify(notif->data);
206 mutex_unlock(¬if->mutex);
207 }
208
gpio_enable_dual_edge(int gpio)209 static void gpio_enable_dual_edge(int gpio)
210 {
211 int v;
212
213 if (gpio == -1)
214 return;
215 v = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, gpio, 0);
216 v |= 0x80; /* enable dual edge */
217 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, gpio, v);
218 }
219
ftr_gpio_init(struct gpio_runtime * rt)220 static void ftr_gpio_init(struct gpio_runtime *rt)
221 {
222 get_gpio("headphone-mute", NULL,
223 &headphone_mute_gpio,
224 &headphone_mute_gpio_activestate);
225 get_gpio("amp-mute", NULL,
226 &_mute_gpio,
227 &_mute_gpio_activestate);
228 get_gpio("lineout-mute", NULL,
229 &lineout_mute_gpio,
230 &lineout_mute_gpio_activestate);
231 get_gpio("hw-reset", "audio-hw-reset",
232 &hw_reset_gpio,
233 &hw_reset_gpio_activestate);
234
235 headphone_detect_node = get_gpio("headphone-detect", NULL,
236 &headphone_detect_gpio,
237 &headphone_detect_gpio_activestate);
238 /* go Apple, and thanks for giving these different names
239 * across the board... */
240 lineout_detect_node = get_gpio("lineout-detect", "line-output-detect",
241 &lineout_detect_gpio,
242 &lineout_detect_gpio_activestate);
243 linein_detect_node = get_gpio("linein-detect", "line-input-detect",
244 &linein_detect_gpio,
245 &linein_detect_gpio_activestate);
246
247 gpio_enable_dual_edge(headphone_detect_gpio);
248 gpio_enable_dual_edge(lineout_detect_gpio);
249 gpio_enable_dual_edge(linein_detect_gpio);
250
251 get_irq(headphone_detect_node, &headphone_detect_irq);
252 get_irq(lineout_detect_node, &lineout_detect_irq);
253 get_irq(linein_detect_node, &linein_detect_irq);
254
255 ftr_gpio_all_amps_off(rt);
256 rt->implementation_private = 0;
257 INIT_DELAYED_WORK(&rt->headphone_notify.work, ftr_handle_notify);
258 INIT_DELAYED_WORK(&rt->line_in_notify.work, ftr_handle_notify);
259 INIT_DELAYED_WORK(&rt->line_out_notify.work, ftr_handle_notify);
260 mutex_init(&rt->headphone_notify.mutex);
261 mutex_init(&rt->line_in_notify.mutex);
262 mutex_init(&rt->line_out_notify.mutex);
263 }
264
ftr_gpio_exit(struct gpio_runtime * rt)265 static void ftr_gpio_exit(struct gpio_runtime *rt)
266 {
267 ftr_gpio_all_amps_off(rt);
268 rt->implementation_private = 0;
269 if (rt->headphone_notify.notify)
270 free_irq(headphone_detect_irq, &rt->headphone_notify);
271 if (rt->line_in_notify.gpio_private)
272 free_irq(linein_detect_irq, &rt->line_in_notify);
273 if (rt->line_out_notify.gpio_private)
274 free_irq(lineout_detect_irq, &rt->line_out_notify);
275 cancel_delayed_work(&rt->headphone_notify.work);
276 cancel_delayed_work(&rt->line_in_notify.work);
277 cancel_delayed_work(&rt->line_out_notify.work);
278 flush_scheduled_work();
279 mutex_destroy(&rt->headphone_notify.mutex);
280 mutex_destroy(&rt->line_in_notify.mutex);
281 mutex_destroy(&rt->line_out_notify.mutex);
282 }
283
ftr_handle_notify_irq(int xx,void * data)284 static irqreturn_t ftr_handle_notify_irq(int xx, void *data)
285 {
286 struct gpio_notification *notif = data;
287
288 schedule_delayed_work(¬if->work, 0);
289
290 return IRQ_HANDLED;
291 }
292
ftr_set_notify(struct gpio_runtime * rt,enum notify_type type,notify_func_t notify,void * data)293 static int ftr_set_notify(struct gpio_runtime *rt,
294 enum notify_type type,
295 notify_func_t notify,
296 void *data)
297 {
298 struct gpio_notification *notif;
299 notify_func_t old;
300 int irq;
301 char *name;
302 int err = -EBUSY;
303
304 switch (type) {
305 case AOA_NOTIFY_HEADPHONE:
306 notif = &rt->headphone_notify;
307 name = "headphone-detect";
308 irq = headphone_detect_irq;
309 break;
310 case AOA_NOTIFY_LINE_IN:
311 notif = &rt->line_in_notify;
312 name = "linein-detect";
313 irq = linein_detect_irq;
314 break;
315 case AOA_NOTIFY_LINE_OUT:
316 notif = &rt->line_out_notify;
317 name = "lineout-detect";
318 irq = lineout_detect_irq;
319 break;
320 default:
321 return -EINVAL;
322 }
323
324 if (irq == NO_IRQ)
325 return -ENODEV;
326
327 mutex_lock(¬if->mutex);
328
329 old = notif->notify;
330
331 if (!old && !notify) {
332 err = 0;
333 goto out_unlock;
334 }
335
336 if (old && notify) {
337 if (old == notify && notif->data == data)
338 err = 0;
339 goto out_unlock;
340 }
341
342 if (old && !notify)
343 free_irq(irq, notif);
344
345 if (!old && notify) {
346 err = request_irq(irq, ftr_handle_notify_irq, 0, name, notif);
347 if (err)
348 goto out_unlock;
349 }
350
351 notif->notify = notify;
352 notif->data = data;
353
354 err = 0;
355 out_unlock:
356 mutex_unlock(¬if->mutex);
357 return err;
358 }
359
ftr_get_detect(struct gpio_runtime * rt,enum notify_type type)360 static int ftr_get_detect(struct gpio_runtime *rt,
361 enum notify_type type)
362 {
363 int gpio, ret, active;
364
365 switch (type) {
366 case AOA_NOTIFY_HEADPHONE:
367 gpio = headphone_detect_gpio;
368 active = headphone_detect_gpio_activestate;
369 break;
370 case AOA_NOTIFY_LINE_IN:
371 gpio = linein_detect_gpio;
372 active = linein_detect_gpio_activestate;
373 break;
374 case AOA_NOTIFY_LINE_OUT:
375 gpio = lineout_detect_gpio;
376 active = lineout_detect_gpio_activestate;
377 break;
378 default:
379 return -EINVAL;
380 }
381
382 if (gpio == -1)
383 return -ENODEV;
384
385 ret = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, gpio, 0);
386 if (ret < 0)
387 return ret;
388 return ((ret >> 1) & 1) == active;
389 }
390
391 static struct gpio_methods methods = {
392 .init = ftr_gpio_init,
393 .exit = ftr_gpio_exit,
394 .all_amps_off = ftr_gpio_all_amps_off,
395 .all_amps_restore = ftr_gpio_all_amps_restore,
396 .set_headphone = ftr_gpio_set_headphone,
397 .set_speakers = ftr_gpio_set_amp,
398 .set_lineout = ftr_gpio_set_lineout,
399 .set_hw_reset = ftr_gpio_set_hw_reset,
400 .get_headphone = ftr_gpio_get_headphone,
401 .get_speakers = ftr_gpio_get_amp,
402 .get_lineout = ftr_gpio_get_lineout,
403 .set_notify = ftr_set_notify,
404 .get_detect = ftr_get_detect,
405 };
406
407 struct gpio_methods *ftr_gpio_methods = &methods;
408 EXPORT_SYMBOL_GPL(ftr_gpio_methods);
409