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(¬if->mutex);
216 if (notif->notify)
217 notif->notify(notif->data);
218 mutex_unlock(¬if->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 &_mute_gpio,
239 &_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(¬if->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(¬if->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(¬if->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