aboutsummaryrefslogtreecommitdiff
path: root/sound/aoa/core/snd-aoa-gpio-feature.c
blob: 40eb47eccf9a9acfe0304284054607ecaa7e79f2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
/*
 * Apple Onboard Audio feature call GPIO control
 *
 * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
 *
 * GPL v2, can be found in COPYING.
 *
 * This file contains the GPIO control routines for 
 * direct (through feature calls) access to the GPIO
 * registers.
 */

#include <asm/pmac_feature.h>
#include <linux/interrupt.h>
#include "../aoa.h"

/* TODO: these are 20 global variables
 * that aren't used on most machines...
 * Move them into a dynamically allocated
 * structure and use that.
 */

/* these are the GPIO numbers (register addresses as offsets into
 * the GPIO space) */
static int headphone_mute_gpio;
static int amp_mute_gpio;
static int lineout_mute_gpio;
static int hw_reset_gpio;
static int lineout_detect_gpio;
static int headphone_detect_gpio;
static int linein_detect_gpio;

/* see the SWITCH_GPIO macro */
static int headphone_mute_gpio_activestate;
static int amp_mute_gpio_activestate;
static int lineout_mute_gpio_activestate;
static int hw_reset_gpio_activestate;
static int lineout_detect_gpio_activestate;
static int headphone_detect_gpio_activestate;
static int linein_detect_gpio_activestate;

/* node pointers that we save when getting the GPIO number
 * to get the interrupt later */
static struct device_node *lineout_detect_node;
static struct device_node *linein_detect_node;
static struct device_node *headphone_detect_node;

static int lineout_detect_irq;
static int linein_detect_irq;
static int headphone_detect_irq;

static struct device_node *get_gpio(char *name,
				    char *altname,
				    int *gpioptr,
				    int *gpioactiveptr)
{
	struct device_node *np, *gpio;
	u32 *reg;
	const char *audio_gpio;

	*gpioptr = -1;

	/* check if we can get it the easy way ... */
	np = of_find_node_by_name(NULL, name);
	if (!np) {
		/* some machines have only gpioX/extint-gpioX nodes,
		 * and an audio-gpio property saying what it is ...
		 * So what we have to do is enumerate all children
		 * of the gpio node and check them all. */
		gpio = of_find_node_by_name(NULL, "gpio");
		if (!gpio)
			return NULL;
		while ((np = of_get_next_child(gpio, np))) {
			audio_gpio = get_property(np, "audio-gpio", NULL);
			if (!audio_gpio)
				continue;
			if (strcmp(audio_gpio, name) == 0)
				break;
			if (altname && (strcmp(audio_gpio, altname) == 0))
				break;
		}
		/* still not found, assume not there */
		if (!np)
			return NULL;
	}

	reg = (u32 *)get_property(np, "reg", NULL);
	if (!reg)
		return NULL;

	*gpioptr = *reg;

	/* this is a hack, usually the GPIOs 'reg' property
	 * should have the offset based from the GPIO space
	 * which is at 0x50, but apparently not always... */
	if (*gpioptr < 0x50)
		*gpioptr += 0x50;

	reg = (u32 *)get_property(np, "audio-gpio-active-state", NULL);
	if (!reg)
		/* Apple seems to default to 1, but
		 * that doesn't seem right at least on most
		 * machines. So until proven that the opposite
		 * is necessary, we default to 0
		 * (which, incidentally, snd-powermac also does...) */
		*gpioactiveptr = 0;
	else
		*gpioactiveptr = *reg;

	return np;
}

static void get_irq(struct device_node * np, int *irqptr)
{
	if (np)
		*irqptr = irq_of_parse_and_map(np, 0);
	else
		*irqptr = NO_IRQ;
}

/* 0x4 is outenable, 0x1 is out, thus 4 or 5 */
#define SWITCH_GPIO(name, v, on)				\
	(((v)&~1) | ((on)?					\
			(name##_gpio_activestate==0?4:5):	\
			(name##_gpio_activestate==0?5:4)))

#define FTR_GPIO(name, bit)					\
static void ftr_gpio_set_##name(struct gpio_runtime *rt, int on)\
{								\
	int v;							\
								\
	if (unlikely(!rt)) return;				\
								\
	if (name##_mute_gpio < 0)				\
		return;						\
								\
	v = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL,		\
			      name##_mute_gpio,			\
			      0);				\
								\
	/* muted = !on... */					\
	v = SWITCH_GPIO(name##_mute, v, !on);			\
								\
	pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL,		\
			  name##_mute_gpio, v);			\
								\
	rt->implementation_private &= ~(1<<bit);		\
	rt->implementation_private |= (!!on << bit);		\
}								\
static int ftr_gpio_get_##name(struct gpio_runtime *rt)		\
{								\
	if (unlikely(!rt)) return 0;				\
	return (rt->implementation_private>>bit)&1;		\
}

FTR_GPIO(headphone, 0);
FTR_GPIO(amp, 1);
FTR_GPIO(lineout, 2);

static void ftr_gpio_set_hw_reset(struct gpio_runtime *rt, int on)
{
	int v;

	if (unlikely(!rt)) return;
	if (hw_reset_gpio < 0)
		return;

	v = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL,
			      hw_reset_gpio, 0);
	v = SWITCH_GPIO(hw_reset, v, on);
	pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL,
			  hw_reset_gpio, v);
}

static void ftr_gpio_all_amps_off(struct gpio_runtime *rt)
{
	int saved;

	if (unlikely(!rt)) return;
	saved = rt->implementation_private;
	ftr_gpio_set_headphone(rt, 0);
	ftr_gpio_set_amp(rt, 0);
	ftr_gpio_set_lineout(rt, 0);
	rt->implementation_private = saved;
}

static void ftr_gpio_all_amps_restore(struct gpio_runtime *rt)
{
	int s;

	if (unlikely(!rt)) return;
	s = rt->implementation_private;
	ftr_gpio_set_headphone(rt, (s>>0)&1);
	ftr_gpio_set_amp(rt, (s>>1)&1);
	ftr_gpio_set_lineout(rt, (s>>2)&1);
}

static void ftr_handle_notify(void *data)
{
	struct gpio_notification *notif = data;

	mutex_lock(&notif->mutex);
	if (notif->notify)
		notif->notify(notif->data);
	mutex_unlock(&notif->mutex);
}

static void gpio_enable_dual_edge(int gpio)
{
	int v;

	if (gpio == -1)
		return;
	v = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, gpio, 0);
	v |= 0x80; /* enable dual edge */
	pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, gpio, v);
}

static void ftr_gpio_init(struct gpio_runtime *rt)
{
	get_gpio("headphone-mute", NULL,
		 &headphone_mute_gpio,
		 &headphone_mute_gpio_activestate);
	get_gpio("amp-mute", NULL,
		 &amp_mute_gpio,
		 &amp_mute_gpio_activestate);
	get_gpio("lineout-mute", NULL,
		 &lineout_mute_gpio,
		 &lineout_mute_gpio_activestate);
	get_gpio("hw-reset", "audio-hw-reset",
		 &hw_reset_gpio,
		 &hw_reset_gpio_activestate);

	headphone_detect_node = get_gpio("headphone-detect", NULL,
					 &headphone_detect_gpio,
					 &headphone_detect_gpio_activestate);
	/* go Apple, and thanks for giving these different names
	 * across the board... */
	lineout_detect_node = get_gpio("lineout-detect", "line-output-detect",
				       &lineout_detect_gpio,
				       &lineout_detect_gpio_activestate);
	linein_detect_node = get_gpio("linein-detect", "line-input-detect",
				      &linein_detect_gpio,
				      &linein_detect_gpio_activestate);

	gpio_enable_dual_edge(headphone_detect_gpio);
	gpio_enable_dual_edge(lineout_detect_gpio);
	gpio_enable_dual_edge(linein_detect_gpio);

	get_irq(headphone_detect_node, &headphone_detect_irq);
	get_irq(lineout_detect_node, &lineout_detect_irq);
	get_irq(linein_detect_node, &linein_detect_irq);

	ftr_gpio_all_amps_off(rt);
	rt->implementation_private = 0;
	INIT_WORK(&rt->headphone_notify.work, ftr_handle_notify,
		  &rt->headphone_notify);
	INIT_WORK(&rt->line_in_notify.work, ftr_handle_notify,
		  &rt->line_in_notify);
	INIT_WORK(&rt->line_out_notify.work, ftr_handle_notify,
		  &rt->line_out_notify);
	mutex_init(&rt->headphone_notify.mutex);
	mutex_init(&rt->line_in_notify.mutex);
	mutex_init(&rt->line_out_notify.mutex);
}

static void ftr_gpio_exit(struct gpio_runtime *rt)
{
	ftr_gpio_all_amps_off(rt);
	rt->implementation_private = 0;
	if (rt->headphone_notify.notify)
		free_irq(headphone_detect_irq, &rt->headphone_notify);
	if (rt->line_in_notify.gpio_private)
		free_irq(linein_detect_irq, &rt->line_in_notify);
	if (rt->line_out_notify.gpio_private)
		free_irq(lineout_detect_irq, &rt->line_out_notify);
	cancel_delayed_work(&rt->headphone_notify.work);
	cancel_delayed_work(&rt->line_in_notify.work);
	cancel_delayed_work(&rt->line_out_notify.work);
	flush_scheduled_work();
	mutex_destroy(&rt->headphone_notify.mutex);
	mutex_destroy(&rt->line_in_notify.mutex);
	mutex_destroy(&rt->line_out_notify.mutex);
}

static irqreturn_t ftr_handle_notify_irq(int xx, void *data)
{
	struct gpio_notification *notif = data;

	schedule_work(&notif->work);

	return IRQ_HANDLED;
}

static int ftr_set_notify(struct gpio_runtime *rt,
			  enum notify_type type,
			  notify_func_t notify,
			  void *data)
{
	struct gpio_notification *notif;
	notify_func_t old;
	int irq;
	char *name;
	int err = -EBUSY;

	switch (type) {
	case AOA_NOTIFY_HEADPHONE:
		notif = &rt->headphone_notify;
		name = "headphone-detect";
		irq = headphone_detect_irq;
		break;
	case AOA_NOTIFY_LINE_IN:
		notif = &rt->line_in_notify;
		name = "linein-detect";
		irq = linein_detect_irq;
		break;
	case AOA_NOTIFY_LINE_OUT:
		notif = &rt->line_out_notify;
		name = "lineout-detect";
		irq = lineout_detect_irq;
		break;
	default:
		return -EINVAL;
	}

	if (irq == NO_IRQ)
		return -ENODEV;

	mutex_lock(&notif->mutex);

	old = notif->notify;

	if (!old && !notify) {
		err = 0;
		goto out_unlock;
	}

	if (old && notify) {
		if (old == notify && notif->data == data)
			err = 0;
		goto out_unlock;
	}

	if (old && !notify)
		free_irq(irq, notif);

	if (!old && notify) {
		err = request_irq(irq, ftr_handle_notify_irq, 0, name, notif);
		if (err)
			goto out_unlock;
	}

	notif->notify = notify;
	notif->data = data;

	err = 0;
 out_unlock:
	mutex_unlock(&notif->mutex);
	return err;
}

static int ftr_get_detect(struct gpio_runtime *rt,
			  enum notify_type type)
{
	int gpio, ret, active;

	switch (type) {
	case AOA_NOTIFY_HEADPHONE:
		gpio = headphone_detect_gpio;
		active = headphone_detect_gpio_activestate;
		break;
	case AOA_NOTIFY_LINE_IN:
		gpio = linein_detect_gpio;
		active = linein_detect_gpio_activestate;
		break;
	case AOA_NOTIFY_LINE_OUT:
		gpio = lineout_detect_gpio;
		active = lineout_detect_gpio_activestate;
		break;
	default:
		return -EINVAL;
	}

	if (gpio == -1)
		return -ENODEV;

	ret = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, gpio, 0);
	if (ret < 0)
		return ret;
	return ((ret >> 1) & 1) == active;
}

static struct gpio_methods methods = {
	.init			= ftr_gpio_init,
	.exit			= ftr_gpio_exit,
	.all_amps_off		= ftr_gpio_all_amps_off,
	.all_amps_restore	= ftr_gpio_all_amps_restore,
	.set_headphone		= ftr_gpio_set_headphone,
	.set_speakers		= ftr_gpio_set_amp,
	.set_lineout		= ftr_gpio_set_lineout,
	.set_hw_reset		= ftr_gpio_set_hw_reset,
	.get_headphone		= ftr_gpio_get_headphone,
	.get_speakers		= ftr_gpio_get_amp,
	.get_lineout		= ftr_gpio_get_lineout,
	.set_notify		= ftr_set_notify,
	.get_detect		= ftr_get_detect,
};

struct gpio_methods *ftr_gpio_methods = &methods;
EXPORT_SYMBOL_GPL(ftr_gpio_methods);