1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Apple Onboard Audio feature call GPIO control
4  *
5  * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
6  *
7  * This file contains the GPIO control routines for
8  * direct (through feature calls) access to the GPIO
9  * registers.
10  */
11 
12 #include <linux/of_irq.h>
13 #include <linux/interrupt.h>
14 #include <asm/pmac_feature.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 
get_gpio(char * name,char * altname,int * gpioptr,int * gpioactiveptr)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 		of_node_put(gpio);
85 		/* still not found, assume not there */
86 		if (!np)
87 			return NULL;
88 	}
89 
90 	reg = of_get_property(np, "reg", NULL);
91 	if (!reg) {
92 		of_node_put(np);
93 		return NULL;
94 	}
95 
96 	*gpioptr = *reg;
97 
98 	/* this is a hack, usually the GPIOs 'reg' property
99 	 * should have the offset based from the GPIO space
100 	 * which is at 0x50, but apparently not always... */
101 	if (*gpioptr < 0x50)
102 		*gpioptr += 0x50;
103 
104 	reg = of_get_property(np, "audio-gpio-active-state", NULL);
105 	if (!reg)
106 		/* Apple seems to default to 1, but
107 		 * that doesn't seem right at least on most
108 		 * machines. So until proven that the opposite
109 		 * is necessary, we default to 0
110 		 * (which, incidentally, snd-powermac also does...) */
111 		*gpioactiveptr = 0;
112 	else
113 		*gpioactiveptr = *reg;
114 
115 	return np;
116 }
117 
get_irq(struct device_node * np,int * irqptr)118 static void get_irq(struct device_node * np, int *irqptr)
119 {
120 	if (np)
121 		*irqptr = irq_of_parse_and_map(np, 0);
122 	else
123 		*irqptr = 0;
124 }
125 
126 /* 0x4 is outenable, 0x1 is out, thus 4 or 5 */
127 #define SWITCH_GPIO(name, v, on)				\
128 	(((v)&~1) | ((on)?					\
129 			(name##_gpio_activestate==0?4:5):	\
130 			(name##_gpio_activestate==0?5:4)))
131 
132 #define FTR_GPIO(name, bit)					\
133 static void ftr_gpio_set_##name(struct gpio_runtime *rt, int on)\
134 {								\
135 	int v;							\
136 								\
137 	if (unlikely(!rt)) return;				\
138 								\
139 	if (name##_mute_gpio < 0)				\
140 		return;						\
141 								\
142 	v = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL,		\
143 			      name##_mute_gpio,			\
144 			      0);				\
145 								\
146 	/* muted = !on... */					\
147 	v = SWITCH_GPIO(name##_mute, v, !on);			\
148 								\
149 	pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL,		\
150 			  name##_mute_gpio, v);			\
151 								\
152 	rt->implementation_private &= ~(1<<bit);		\
153 	rt->implementation_private |= (!!on << bit);		\
154 }								\
155 static int ftr_gpio_get_##name(struct gpio_runtime *rt)		\
156 {								\
157 	if (unlikely(!rt)) return 0;				\
158 	return (rt->implementation_private>>bit)&1;		\
159 }
160 
161 FTR_GPIO(headphone, 0);
162 FTR_GPIO(amp, 1);
163 FTR_GPIO(lineout, 2);
164 FTR_GPIO(master, 3);
165 
ftr_gpio_set_hw_reset(struct gpio_runtime * rt,int on)166 static void ftr_gpio_set_hw_reset(struct gpio_runtime *rt, int on)
167 {
168 	int v;
169 
170 	if (unlikely(!rt)) return;
171 	if (hw_reset_gpio < 0)
172 		return;
173 
174 	v = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL,
175 			      hw_reset_gpio, 0);
176 	v = SWITCH_GPIO(hw_reset, v, on);
177 	pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL,
178 			  hw_reset_gpio, v);
179 }
180 
181 static struct gpio_methods methods;
182 
ftr_gpio_all_amps_off(struct gpio_runtime * rt)183 static void ftr_gpio_all_amps_off(struct gpio_runtime *rt)
184 {
185 	int saved;
186 
187 	if (unlikely(!rt)) return;
188 	saved = rt->implementation_private;
189 	ftr_gpio_set_headphone(rt, 0);
190 	ftr_gpio_set_amp(rt, 0);
191 	ftr_gpio_set_lineout(rt, 0);
192 	if (methods.set_master)
193 		ftr_gpio_set_master(rt, 0);
194 	rt->implementation_private = saved;
195 }
196 
ftr_gpio_all_amps_restore(struct gpio_runtime * rt)197 static void ftr_gpio_all_amps_restore(struct gpio_runtime *rt)
198 {
199 	int s;
200 
201 	if (unlikely(!rt)) return;
202 	s = rt->implementation_private;
203 	ftr_gpio_set_headphone(rt, (s>>0)&1);
204 	ftr_gpio_set_amp(rt, (s>>1)&1);
205 	ftr_gpio_set_lineout(rt, (s>>2)&1);
206 	if (methods.set_master)
207 		ftr_gpio_set_master(rt, (s>>3)&1);
208 }
209 
ftr_handle_notify(struct work_struct * work)210 static void ftr_handle_notify(struct work_struct *work)
211 {
212 	struct gpio_notification *notif =
213 		container_of(work, struct gpio_notification, work.work);
214 
215 	mutex_lock(&notif->mutex);
216 	if (notif->notify)
217 		notif->notify(notif->data);
218 	mutex_unlock(&notif->mutex);
219 }
220 
gpio_enable_dual_edge(int gpio)221 static void gpio_enable_dual_edge(int gpio)
222 {
223 	int v;
224 
225 	if (gpio == -1)
226 		return;
227 	v = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, gpio, 0);
228 	v |= 0x80; /* enable dual edge */
229 	pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, gpio, v);
230 }
231 
ftr_gpio_init(struct gpio_runtime * rt)232 static void ftr_gpio_init(struct gpio_runtime *rt)
233 {
234 	get_gpio("headphone-mute", NULL,
235 		 &headphone_mute_gpio,
236 		 &headphone_mute_gpio_activestate);
237 	get_gpio("amp-mute", NULL,
238 		 &amp_mute_gpio,
239 		 &amp_mute_gpio_activestate);
240 	get_gpio("lineout-mute", NULL,
241 		 &lineout_mute_gpio,
242 		 &lineout_mute_gpio_activestate);
243 	get_gpio("hw-reset", "audio-hw-reset",
244 		 &hw_reset_gpio,
245 		 &hw_reset_gpio_activestate);
246 	if (get_gpio("master-mute", NULL,
247 		     &master_mute_gpio,
248 		     &master_mute_gpio_activestate)) {
249 		methods.set_master = ftr_gpio_set_master;
250 		methods.get_master = ftr_gpio_get_master;
251 	}
252 
253 	headphone_detect_node = get_gpio("headphone-detect", NULL,
254 					 &headphone_detect_gpio,
255 					 &headphone_detect_gpio_activestate);
256 	/* go Apple, and thanks for giving these different names
257 	 * across the board... */
258 	lineout_detect_node = get_gpio("lineout-detect", "line-output-detect",
259 				       &lineout_detect_gpio,
260 				       &lineout_detect_gpio_activestate);
261 	linein_detect_node = get_gpio("linein-detect", "line-input-detect",
262 				      &linein_detect_gpio,
263 				      &linein_detect_gpio_activestate);
264 
265 	gpio_enable_dual_edge(headphone_detect_gpio);
266 	gpio_enable_dual_edge(lineout_detect_gpio);
267 	gpio_enable_dual_edge(linein_detect_gpio);
268 
269 	get_irq(headphone_detect_node, &headphone_detect_irq);
270 	get_irq(lineout_detect_node, &lineout_detect_irq);
271 	get_irq(linein_detect_node, &linein_detect_irq);
272 
273 	ftr_gpio_all_amps_off(rt);
274 	rt->implementation_private = 0;
275 	INIT_DELAYED_WORK(&rt->headphone_notify.work, ftr_handle_notify);
276 	INIT_DELAYED_WORK(&rt->line_in_notify.work, ftr_handle_notify);
277 	INIT_DELAYED_WORK(&rt->line_out_notify.work, ftr_handle_notify);
278 	mutex_init(&rt->headphone_notify.mutex);
279 	mutex_init(&rt->line_in_notify.mutex);
280 	mutex_init(&rt->line_out_notify.mutex);
281 }
282 
ftr_gpio_exit(struct gpio_runtime * rt)283 static void ftr_gpio_exit(struct gpio_runtime *rt)
284 {
285 	ftr_gpio_all_amps_off(rt);
286 	rt->implementation_private = 0;
287 	if (rt->headphone_notify.notify)
288 		free_irq(headphone_detect_irq, &rt->headphone_notify);
289 	if (rt->line_in_notify.gpio_private)
290 		free_irq(linein_detect_irq, &rt->line_in_notify);
291 	if (rt->line_out_notify.gpio_private)
292 		free_irq(lineout_detect_irq, &rt->line_out_notify);
293 	cancel_delayed_work_sync(&rt->headphone_notify.work);
294 	cancel_delayed_work_sync(&rt->line_in_notify.work);
295 	cancel_delayed_work_sync(&rt->line_out_notify.work);
296 	mutex_destroy(&rt->headphone_notify.mutex);
297 	mutex_destroy(&rt->line_in_notify.mutex);
298 	mutex_destroy(&rt->line_out_notify.mutex);
299 }
300 
ftr_handle_notify_irq(int xx,void * data)301 static irqreturn_t ftr_handle_notify_irq(int xx, void *data)
302 {
303 	struct gpio_notification *notif = data;
304 
305 	schedule_delayed_work(&notif->work, 0);
306 
307 	return IRQ_HANDLED;
308 }
309 
ftr_set_notify(struct gpio_runtime * rt,enum notify_type type,notify_func_t notify,void * data)310 static int ftr_set_notify(struct gpio_runtime *rt,
311 			  enum notify_type type,
312 			  notify_func_t notify,
313 			  void *data)
314 {
315 	struct gpio_notification *notif;
316 	notify_func_t old;
317 	int irq;
318 	char *name;
319 	int err = -EBUSY;
320 
321 	switch (type) {
322 	case AOA_NOTIFY_HEADPHONE:
323 		notif = &rt->headphone_notify;
324 		name = "headphone-detect";
325 		irq = headphone_detect_irq;
326 		break;
327 	case AOA_NOTIFY_LINE_IN:
328 		notif = &rt->line_in_notify;
329 		name = "linein-detect";
330 		irq = linein_detect_irq;
331 		break;
332 	case AOA_NOTIFY_LINE_OUT:
333 		notif = &rt->line_out_notify;
334 		name = "lineout-detect";
335 		irq = lineout_detect_irq;
336 		break;
337 	default:
338 		return -EINVAL;
339 	}
340 
341 	if (!irq)
342 		return -ENODEV;
343 
344 	mutex_lock(&notif->mutex);
345 
346 	old = notif->notify;
347 
348 	if (!old && !notify) {
349 		err = 0;
350 		goto out_unlock;
351 	}
352 
353 	if (old && notify) {
354 		if (old == notify && notif->data == data)
355 			err = 0;
356 		goto out_unlock;
357 	}
358 
359 	if (old && !notify)
360 		free_irq(irq, notif);
361 
362 	if (!old && notify) {
363 		err = request_irq(irq, ftr_handle_notify_irq, 0, name, notif);
364 		if (err)
365 			goto out_unlock;
366 	}
367 
368 	notif->notify = notify;
369 	notif->data = data;
370 
371 	err = 0;
372  out_unlock:
373 	mutex_unlock(&notif->mutex);
374 	return err;
375 }
376 
ftr_get_detect(struct gpio_runtime * rt,enum notify_type type)377 static int ftr_get_detect(struct gpio_runtime *rt,
378 			  enum notify_type type)
379 {
380 	int gpio, ret, active;
381 
382 	switch (type) {
383 	case AOA_NOTIFY_HEADPHONE:
384 		gpio = headphone_detect_gpio;
385 		active = headphone_detect_gpio_activestate;
386 		break;
387 	case AOA_NOTIFY_LINE_IN:
388 		gpio = linein_detect_gpio;
389 		active = linein_detect_gpio_activestate;
390 		break;
391 	case AOA_NOTIFY_LINE_OUT:
392 		gpio = lineout_detect_gpio;
393 		active = lineout_detect_gpio_activestate;
394 		break;
395 	default:
396 		return -EINVAL;
397 	}
398 
399 	if (gpio == -1)
400 		return -ENODEV;
401 
402 	ret = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, gpio, 0);
403 	if (ret < 0)
404 		return ret;
405 	return ((ret >> 1) & 1) == active;
406 }
407 
408 static struct gpio_methods methods = {
409 	.init			= ftr_gpio_init,
410 	.exit			= ftr_gpio_exit,
411 	.all_amps_off		= ftr_gpio_all_amps_off,
412 	.all_amps_restore	= ftr_gpio_all_amps_restore,
413 	.set_headphone		= ftr_gpio_set_headphone,
414 	.set_speakers		= ftr_gpio_set_amp,
415 	.set_lineout		= ftr_gpio_set_lineout,
416 	.set_hw_reset		= ftr_gpio_set_hw_reset,
417 	.get_headphone		= ftr_gpio_get_headphone,
418 	.get_speakers		= ftr_gpio_get_amp,
419 	.get_lineout		= ftr_gpio_get_lineout,
420 	.set_notify		= ftr_set_notify,
421 	.get_detect		= ftr_get_detect,
422 };
423 
424 struct gpio_methods *ftr_gpio_methods = &methods;
425 EXPORT_SYMBOL_GPL(ftr_gpio_methods);
426