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 | |
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, name: "gpio" ); |
73 | if (!gpio) |
74 | return NULL; |
75 | while ((np = of_get_next_child(node: gpio, prev: np))) { |
76 | audio_gpio = of_get_property(node: np, name: "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(node: gpio); |
85 | /* still not found, assume not there */ |
86 | if (!np) |
87 | return NULL; |
88 | } |
89 | |
90 | reg = of_get_property(node: np, name: "reg" , NULL); |
91 | if (!reg) { |
92 | of_node_put(node: 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(node: np, name: "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 | |
118 | static void get_irq(struct device_node * np, int *irqptr) |
119 | { |
120 | if (np) |
121 | *irqptr = irq_of_parse_and_map(node: np, index: 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 | |
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 | |
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, on: 0); |
190 | ftr_gpio_set_amp(rt, on: 0); |
191 | ftr_gpio_set_lineout(rt, on: 0); |
192 | if (methods.set_master) |
193 | ftr_gpio_set_master(rt, on: 0); |
194 | rt->implementation_private = saved; |
195 | } |
196 | |
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, on: (s>>0)&1); |
204 | ftr_gpio_set_amp(rt, on: (s>>1)&1); |
205 | ftr_gpio_set_lineout(rt, on: (s>>2)&1); |
206 | if (methods.set_master) |
207 | ftr_gpio_set_master(rt, on: (s>>3)&1); |
208 | } |
209 | |
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(lock: ¬if->mutex); |
219 | } |
220 | |
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 | |
232 | static void ftr_gpio_init(struct gpio_runtime *rt) |
233 | { |
234 | get_gpio(name: "headphone-mute" , NULL, |
235 | gpioptr: &headphone_mute_gpio, |
236 | gpioactiveptr: &headphone_mute_gpio_activestate); |
237 | get_gpio(name: "amp-mute" , NULL, |
238 | gpioptr: &_mute_gpio, |
239 | gpioactiveptr: &_mute_gpio_activestate); |
240 | get_gpio(name: "lineout-mute" , NULL, |
241 | gpioptr: &lineout_mute_gpio, |
242 | gpioactiveptr: &lineout_mute_gpio_activestate); |
243 | get_gpio(name: "hw-reset" , altname: "audio-hw-reset" , |
244 | gpioptr: &hw_reset_gpio, |
245 | gpioactiveptr: &hw_reset_gpio_activestate); |
246 | if (get_gpio(name: "master-mute" , NULL, |
247 | gpioptr: &master_mute_gpio, |
248 | gpioactiveptr: &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(name: "headphone-detect" , NULL, |
254 | gpioptr: &headphone_detect_gpio, |
255 | gpioactiveptr: &headphone_detect_gpio_activestate); |
256 | /* go Apple, and thanks for giving these different names |
257 | * across the board... */ |
258 | lineout_detect_node = get_gpio(name: "lineout-detect" , altname: "line-output-detect" , |
259 | gpioptr: &lineout_detect_gpio, |
260 | gpioactiveptr: &lineout_detect_gpio_activestate); |
261 | linein_detect_node = get_gpio(name: "linein-detect" , altname: "line-input-detect" , |
262 | gpioptr: &linein_detect_gpio, |
263 | gpioactiveptr: &linein_detect_gpio_activestate); |
264 | |
265 | gpio_enable_dual_edge(gpio: headphone_detect_gpio); |
266 | gpio_enable_dual_edge(gpio: lineout_detect_gpio); |
267 | gpio_enable_dual_edge(gpio: linein_detect_gpio); |
268 | |
269 | get_irq(np: headphone_detect_node, irqptr: &headphone_detect_irq); |
270 | get_irq(np: lineout_detect_node, irqptr: &lineout_detect_irq); |
271 | get_irq(np: linein_detect_node, irqptr: &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 | |
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(dwork: &rt->headphone_notify.work); |
294 | cancel_delayed_work_sync(dwork: &rt->line_in_notify.work); |
295 | cancel_delayed_work_sync(dwork: &rt->line_out_notify.work); |
296 | mutex_destroy(lock: &rt->headphone_notify.mutex); |
297 | mutex_destroy(lock: &rt->line_in_notify.mutex); |
298 | mutex_destroy(lock: &rt->line_out_notify.mutex); |
299 | } |
300 | |
301 | static irqreturn_t ftr_handle_notify_irq(int xx, void *data) |
302 | { |
303 | struct gpio_notification *notif = data; |
304 | |
305 | schedule_delayed_work(dwork: ¬if->work, delay: 0); |
306 | |
307 | return IRQ_HANDLED; |
308 | } |
309 | |
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, handler: ftr_handle_notify_irq, flags: 0, name, dev: 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(lock: ¬if->mutex); |
374 | return err; |
375 | } |
376 | |
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 | |