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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) */
25static int headphone_mute_gpio;
26static int master_mute_gpio;
27static int amp_mute_gpio;
28static int lineout_mute_gpio;
29static int hw_reset_gpio;
30static int lineout_detect_gpio;
31static int headphone_detect_gpio;
32static int linein_detect_gpio;
33
34/* see the SWITCH_GPIO macro */
35static int headphone_mute_gpio_activestate;
36static int master_mute_gpio_activestate;
37static int amp_mute_gpio_activestate;
38static int lineout_mute_gpio_activestate;
39static int hw_reset_gpio_activestate;
40static int lineout_detect_gpio_activestate;
41static int headphone_detect_gpio_activestate;
42static int linein_detect_gpio_activestate;
43
44/* node pointers that we save when getting the GPIO number
45 * to get the interrupt later */
46static struct device_node *lineout_detect_node;
47static struct device_node *linein_detect_node;
48static struct device_node *headphone_detect_node;
49
50static int lineout_detect_irq;
51static int linein_detect_irq;
52static int headphone_detect_irq;
53
54static 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
115static 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) \
130static 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} \
152static 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
158FTR_GPIO(headphone, 0);
159FTR_GPIO(amp, 1);
160FTR_GPIO(lineout, 2);
161FTR_GPIO(master, 3);
162
163static 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
178static struct gpio_methods methods;
179
180static 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
194static 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
207static 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(¬if->mutex);
213 if (notif->notify)
214 notif->notify(notif->data);
215 mutex_unlock(¬if->mutex);
216}
217
218static 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
229static 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 &_mute_gpio,
236 &_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
280static 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_sync(&rt->headphone_notify.work);
291 cancel_delayed_work_sync(&rt->line_in_notify.work);
292 cancel_delayed_work_sync(&rt->line_out_notify.work);
293 mutex_destroy(&rt->headphone_notify.mutex);
294 mutex_destroy(&rt->line_in_notify.mutex);
295 mutex_destroy(&rt->line_out_notify.mutex);
296}
297
298static irqreturn_t ftr_handle_notify_irq(int xx, void *data)
299{
300 struct gpio_notification *notif = data;
301
302 schedule_delayed_work(¬if->work, 0);
303
304 return IRQ_HANDLED;
305}
306
307static int ftr_set_notify(struct gpio_runtime *rt,
308 enum notify_type type,
309 notify_func_t notify,
310 void *data)
311{
312 struct gpio_notification *notif;
313 notify_func_t old;
314 int irq;
315 char *name;
316 int err = -EBUSY;
317
318 switch (type) {
319 case AOA_NOTIFY_HEADPHONE:
320 notif = &rt->headphone_notify;
321 name = "headphone-detect";
322 irq = headphone_detect_irq;
323 break;
324 case AOA_NOTIFY_LINE_IN:
325 notif = &rt->line_in_notify;
326 name = "linein-detect";
327 irq = linein_detect_irq;
328 break;
329 case AOA_NOTIFY_LINE_OUT:
330 notif = &rt->line_out_notify;
331 name = "lineout-detect";
332 irq = lineout_detect_irq;
333 break;
334 default:
335 return -EINVAL;
336 }
337
338 if (irq == NO_IRQ)
339 return -ENODEV;
340
341 mutex_lock(¬if->mutex);
342
343 old = notif->notify;
344
345 if (!old && !notify) {
346 err = 0;
347 goto out_unlock;
348 }
349
350 if (old && notify) {
351 if (old == notify && notif->data == data)
352 err = 0;
353 goto out_unlock;
354 }
355
356 if (old && !notify)
357 free_irq(irq, notif);
358
359 if (!old && notify) {
360 err = request_irq(irq, ftr_handle_notify_irq, 0, name, notif);
361 if (err)
362 goto out_unlock;
363 }
364
365 notif->notify = notify;
366 notif->data = data;
367
368 err = 0;
369 out_unlock:
370 mutex_unlock(¬if->mutex);
371 return err;
372}
373
374static int ftr_get_detect(struct gpio_runtime *rt,
375 enum notify_type type)
376{
377 int gpio, ret, active;
378
379 switch (type) {
380 case AOA_NOTIFY_HEADPHONE:
381 gpio = headphone_detect_gpio;
382 active = headphone_detect_gpio_activestate;
383 break;
384 case AOA_NOTIFY_LINE_IN:
385 gpio = linein_detect_gpio;
386 active = linein_detect_gpio_activestate;
387 break;
388 case AOA_NOTIFY_LINE_OUT:
389 gpio = lineout_detect_gpio;
390 active = lineout_detect_gpio_activestate;
391 break;
392 default:
393 return -EINVAL;
394 }
395
396 if (gpio == -1)
397 return -ENODEV;
398
399 ret = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, gpio, 0);
400 if (ret < 0)
401 return ret;
402 return ((ret >> 1) & 1) == active;
403}
404
405static struct gpio_methods methods = {
406 .init = ftr_gpio_init,
407 .exit = ftr_gpio_exit,
408 .all_amps_off = ftr_gpio_all_amps_off,
409 .all_amps_restore = ftr_gpio_all_amps_restore,
410 .set_headphone = ftr_gpio_set_headphone,
411 .set_speakers = ftr_gpio_set_amp,
412 .set_lineout = ftr_gpio_set_lineout,
413 .set_hw_reset = ftr_gpio_set_hw_reset,
414 .get_headphone = ftr_gpio_get_headphone,
415 .get_speakers = ftr_gpio_get_amp,
416 .get_lineout = ftr_gpio_get_lineout,
417 .set_notify = ftr_set_notify,
418 .get_detect = ftr_get_detect,
419};
420
421struct gpio_methods *ftr_gpio_methods = &methods;
422EXPORT_SYMBOL_GPL(ftr_gpio_methods);