Johannes Berg | f3d9478 | 2006-06-21 15:42:43 +0200 | [diff] [blame] | 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 20 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 amp_mute_gpio; |
| 27 | static int lineout_mute_gpio; |
| 28 | static int hw_reset_gpio; |
| 29 | static int lineout_detect_gpio; |
| 30 | static int headphone_detect_gpio; |
| 31 | static int linein_detect_gpio; |
| 32 | |
| 33 | /* see the SWITCH_GPIO macro */ |
| 34 | static int headphone_mute_gpio_activestate; |
| 35 | static int amp_mute_gpio_activestate; |
| 36 | static int lineout_mute_gpio_activestate; |
| 37 | static int hw_reset_gpio_activestate; |
| 38 | static int lineout_detect_gpio_activestate; |
| 39 | static int headphone_detect_gpio_activestate; |
| 40 | static int linein_detect_gpio_activestate; |
| 41 | |
| 42 | /* node pointers that we save when getting the GPIO number |
| 43 | * to get the interrupt later */ |
| 44 | static struct device_node *lineout_detect_node; |
| 45 | static struct device_node *linein_detect_node; |
| 46 | static struct device_node *headphone_detect_node; |
| 47 | |
| 48 | static int lineout_detect_irq; |
| 49 | static int linein_detect_irq; |
| 50 | static int headphone_detect_irq; |
| 51 | |
| 52 | static struct device_node *get_gpio(char *name, |
| 53 | char *altname, |
| 54 | int *gpioptr, |
| 55 | int *gpioactiveptr) |
| 56 | { |
| 57 | struct device_node *np, *gpio; |
Stephen Rothwell | a7edd0e | 2007-04-03 10:52:17 +1000 | [diff] [blame^] | 58 | const u32 *reg; |
Jeremy Kerr | abddd18 | 2006-07-12 15:41:18 +1000 | [diff] [blame] | 59 | const char *audio_gpio; |
Johannes Berg | f3d9478 | 2006-06-21 15:42:43 +0200 | [diff] [blame] | 60 | |
| 61 | *gpioptr = -1; |
| 62 | |
| 63 | /* check if we can get it the easy way ... */ |
| 64 | np = of_find_node_by_name(NULL, name); |
| 65 | if (!np) { |
| 66 | /* some machines have only gpioX/extint-gpioX nodes, |
| 67 | * and an audio-gpio property saying what it is ... |
| 68 | * So what we have to do is enumerate all children |
| 69 | * of the gpio node and check them all. */ |
| 70 | gpio = of_find_node_by_name(NULL, "gpio"); |
| 71 | if (!gpio) |
| 72 | return NULL; |
| 73 | while ((np = of_get_next_child(gpio, np))) { |
| 74 | audio_gpio = get_property(np, "audio-gpio", NULL); |
| 75 | if (!audio_gpio) |
| 76 | continue; |
| 77 | if (strcmp(audio_gpio, name) == 0) |
| 78 | break; |
| 79 | if (altname && (strcmp(audio_gpio, altname) == 0)) |
| 80 | break; |
| 81 | } |
| 82 | /* still not found, assume not there */ |
| 83 | if (!np) |
| 84 | return NULL; |
| 85 | } |
| 86 | |
Stephen Rothwell | a7edd0e | 2007-04-03 10:52:17 +1000 | [diff] [blame^] | 87 | reg = get_property(np, "reg", NULL); |
Johannes Berg | f3d9478 | 2006-06-21 15:42:43 +0200 | [diff] [blame] | 88 | if (!reg) |
| 89 | return NULL; |
| 90 | |
| 91 | *gpioptr = *reg; |
| 92 | |
| 93 | /* this is a hack, usually the GPIOs 'reg' property |
| 94 | * should have the offset based from the GPIO space |
| 95 | * which is at 0x50, but apparently not always... */ |
| 96 | if (*gpioptr < 0x50) |
| 97 | *gpioptr += 0x50; |
| 98 | |
Stephen Rothwell | a7edd0e | 2007-04-03 10:52:17 +1000 | [diff] [blame^] | 99 | reg = get_property(np, "audio-gpio-active-state", NULL); |
Johannes Berg | f3d9478 | 2006-06-21 15:42:43 +0200 | [diff] [blame] | 100 | if (!reg) |
| 101 | /* Apple seems to default to 1, but |
| 102 | * that doesn't seem right at least on most |
| 103 | * machines. So until proven that the opposite |
| 104 | * is necessary, we default to 0 |
| 105 | * (which, incidentally, snd-powermac also does...) */ |
| 106 | *gpioactiveptr = 0; |
| 107 | else |
| 108 | *gpioactiveptr = *reg; |
| 109 | |
| 110 | return np; |
| 111 | } |
| 112 | |
| 113 | static void get_irq(struct device_node * np, int *irqptr) |
| 114 | { |
Johannes Berg | 2566d36 | 2006-07-25 16:12:51 +0200 | [diff] [blame] | 115 | if (np) |
| 116 | *irqptr = irq_of_parse_and_map(np, 0); |
| 117 | else |
| 118 | *irqptr = NO_IRQ; |
Johannes Berg | f3d9478 | 2006-06-21 15:42:43 +0200 | [diff] [blame] | 119 | } |
| 120 | |
| 121 | /* 0x4 is outenable, 0x1 is out, thus 4 or 5 */ |
| 122 | #define SWITCH_GPIO(name, v, on) \ |
| 123 | (((v)&~1) | ((on)? \ |
| 124 | (name##_gpio_activestate==0?4:5): \ |
| 125 | (name##_gpio_activestate==0?5:4))) |
| 126 | |
| 127 | #define FTR_GPIO(name, bit) \ |
| 128 | static void ftr_gpio_set_##name(struct gpio_runtime *rt, int on)\ |
| 129 | { \ |
| 130 | int v; \ |
| 131 | \ |
| 132 | if (unlikely(!rt)) return; \ |
| 133 | \ |
| 134 | if (name##_mute_gpio < 0) \ |
| 135 | return; \ |
| 136 | \ |
| 137 | v = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, \ |
| 138 | name##_mute_gpio, \ |
| 139 | 0); \ |
| 140 | \ |
| 141 | /* muted = !on... */ \ |
| 142 | v = SWITCH_GPIO(name##_mute, v, !on); \ |
| 143 | \ |
| 144 | pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, \ |
| 145 | name##_mute_gpio, v); \ |
| 146 | \ |
| 147 | rt->implementation_private &= ~(1<<bit); \ |
| 148 | rt->implementation_private |= (!!on << bit); \ |
| 149 | } \ |
| 150 | static int ftr_gpio_get_##name(struct gpio_runtime *rt) \ |
| 151 | { \ |
| 152 | if (unlikely(!rt)) return 0; \ |
| 153 | return (rt->implementation_private>>bit)&1; \ |
| 154 | } |
| 155 | |
| 156 | FTR_GPIO(headphone, 0); |
| 157 | FTR_GPIO(amp, 1); |
| 158 | FTR_GPIO(lineout, 2); |
| 159 | |
| 160 | static void ftr_gpio_set_hw_reset(struct gpio_runtime *rt, int on) |
| 161 | { |
| 162 | int v; |
| 163 | |
| 164 | if (unlikely(!rt)) return; |
| 165 | if (hw_reset_gpio < 0) |
| 166 | return; |
| 167 | |
| 168 | v = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, |
| 169 | hw_reset_gpio, 0); |
| 170 | v = SWITCH_GPIO(hw_reset, v, on); |
| 171 | pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, |
| 172 | hw_reset_gpio, v); |
| 173 | } |
| 174 | |
| 175 | static void ftr_gpio_all_amps_off(struct gpio_runtime *rt) |
| 176 | { |
| 177 | int saved; |
| 178 | |
| 179 | if (unlikely(!rt)) return; |
| 180 | saved = rt->implementation_private; |
| 181 | ftr_gpio_set_headphone(rt, 0); |
| 182 | ftr_gpio_set_amp(rt, 0); |
| 183 | ftr_gpio_set_lineout(rt, 0); |
| 184 | rt->implementation_private = saved; |
| 185 | } |
| 186 | |
| 187 | static void ftr_gpio_all_amps_restore(struct gpio_runtime *rt) |
| 188 | { |
| 189 | int s; |
| 190 | |
| 191 | if (unlikely(!rt)) return; |
| 192 | s = rt->implementation_private; |
| 193 | ftr_gpio_set_headphone(rt, (s>>0)&1); |
| 194 | ftr_gpio_set_amp(rt, (s>>1)&1); |
| 195 | ftr_gpio_set_lineout(rt, (s>>2)&1); |
| 196 | } |
| 197 | |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 198 | static void ftr_handle_notify(struct work_struct *work) |
Johannes Berg | f3d9478 | 2006-06-21 15:42:43 +0200 | [diff] [blame] | 199 | { |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 200 | struct gpio_notification *notif = |
| 201 | container_of(work, struct gpio_notification, work.work); |
Johannes Berg | f3d9478 | 2006-06-21 15:42:43 +0200 | [diff] [blame] | 202 | |
| 203 | mutex_lock(¬if->mutex); |
| 204 | if (notif->notify) |
| 205 | notif->notify(notif->data); |
| 206 | mutex_unlock(¬if->mutex); |
| 207 | } |
| 208 | |
Johannes Berg | bd66f3b | 2006-06-28 14:00:58 +0200 | [diff] [blame] | 209 | static void gpio_enable_dual_edge(int gpio) |
| 210 | { |
| 211 | int v; |
| 212 | |
| 213 | if (gpio == -1) |
| 214 | return; |
| 215 | v = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, gpio, 0); |
| 216 | v |= 0x80; /* enable dual edge */ |
| 217 | pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, gpio, v); |
| 218 | } |
| 219 | |
Johannes Berg | f3d9478 | 2006-06-21 15:42:43 +0200 | [diff] [blame] | 220 | static void ftr_gpio_init(struct gpio_runtime *rt) |
| 221 | { |
| 222 | get_gpio("headphone-mute", NULL, |
| 223 | &headphone_mute_gpio, |
| 224 | &headphone_mute_gpio_activestate); |
| 225 | get_gpio("amp-mute", NULL, |
| 226 | &_mute_gpio, |
| 227 | &_mute_gpio_activestate); |
| 228 | get_gpio("lineout-mute", NULL, |
| 229 | &lineout_mute_gpio, |
| 230 | &lineout_mute_gpio_activestate); |
| 231 | get_gpio("hw-reset", "audio-hw-reset", |
| 232 | &hw_reset_gpio, |
| 233 | &hw_reset_gpio_activestate); |
| 234 | |
| 235 | headphone_detect_node = get_gpio("headphone-detect", NULL, |
| 236 | &headphone_detect_gpio, |
| 237 | &headphone_detect_gpio_activestate); |
| 238 | /* go Apple, and thanks for giving these different names |
| 239 | * across the board... */ |
| 240 | lineout_detect_node = get_gpio("lineout-detect", "line-output-detect", |
| 241 | &lineout_detect_gpio, |
| 242 | &lineout_detect_gpio_activestate); |
| 243 | linein_detect_node = get_gpio("linein-detect", "line-input-detect", |
| 244 | &linein_detect_gpio, |
| 245 | &linein_detect_gpio_activestate); |
| 246 | |
Johannes Berg | bd66f3b | 2006-06-28 14:00:58 +0200 | [diff] [blame] | 247 | gpio_enable_dual_edge(headphone_detect_gpio); |
| 248 | gpio_enable_dual_edge(lineout_detect_gpio); |
| 249 | gpio_enable_dual_edge(linein_detect_gpio); |
| 250 | |
Johannes Berg | f3d9478 | 2006-06-21 15:42:43 +0200 | [diff] [blame] | 251 | get_irq(headphone_detect_node, &headphone_detect_irq); |
| 252 | get_irq(lineout_detect_node, &lineout_detect_irq); |
| 253 | get_irq(linein_detect_node, &linein_detect_irq); |
| 254 | |
| 255 | ftr_gpio_all_amps_off(rt); |
| 256 | rt->implementation_private = 0; |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 257 | INIT_DELAYED_WORK(&rt->headphone_notify.work, ftr_handle_notify); |
| 258 | INIT_DELAYED_WORK(&rt->line_in_notify.work, ftr_handle_notify); |
| 259 | INIT_DELAYED_WORK(&rt->line_out_notify.work, ftr_handle_notify); |
Johannes Berg | f3d9478 | 2006-06-21 15:42:43 +0200 | [diff] [blame] | 260 | mutex_init(&rt->headphone_notify.mutex); |
| 261 | mutex_init(&rt->line_in_notify.mutex); |
| 262 | mutex_init(&rt->line_out_notify.mutex); |
| 263 | } |
| 264 | |
| 265 | static void ftr_gpio_exit(struct gpio_runtime *rt) |
| 266 | { |
| 267 | ftr_gpio_all_amps_off(rt); |
| 268 | rt->implementation_private = 0; |
| 269 | if (rt->headphone_notify.notify) |
| 270 | free_irq(headphone_detect_irq, &rt->headphone_notify); |
| 271 | if (rt->line_in_notify.gpio_private) |
| 272 | free_irq(linein_detect_irq, &rt->line_in_notify); |
| 273 | if (rt->line_out_notify.gpio_private) |
| 274 | free_irq(lineout_detect_irq, &rt->line_out_notify); |
| 275 | cancel_delayed_work(&rt->headphone_notify.work); |
| 276 | cancel_delayed_work(&rt->line_in_notify.work); |
| 277 | cancel_delayed_work(&rt->line_out_notify.work); |
| 278 | flush_scheduled_work(); |
| 279 | mutex_destroy(&rt->headphone_notify.mutex); |
| 280 | mutex_destroy(&rt->line_in_notify.mutex); |
| 281 | mutex_destroy(&rt->line_out_notify.mutex); |
| 282 | } |
| 283 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 284 | static irqreturn_t ftr_handle_notify_irq(int xx, void *data) |
Johannes Berg | f3d9478 | 2006-06-21 15:42:43 +0200 | [diff] [blame] | 285 | { |
| 286 | struct gpio_notification *notif = data; |
| 287 | |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 288 | schedule_delayed_work(¬if->work, 0); |
Johannes Berg | f3d9478 | 2006-06-21 15:42:43 +0200 | [diff] [blame] | 289 | |
| 290 | return IRQ_HANDLED; |
| 291 | } |
| 292 | |
| 293 | static int ftr_set_notify(struct gpio_runtime *rt, |
| 294 | enum notify_type type, |
| 295 | notify_func_t notify, |
| 296 | void *data) |
| 297 | { |
| 298 | struct gpio_notification *notif; |
| 299 | notify_func_t old; |
| 300 | int irq; |
| 301 | char *name; |
| 302 | int err = -EBUSY; |
| 303 | |
| 304 | switch (type) { |
| 305 | case AOA_NOTIFY_HEADPHONE: |
| 306 | notif = &rt->headphone_notify; |
| 307 | name = "headphone-detect"; |
| 308 | irq = headphone_detect_irq; |
| 309 | break; |
| 310 | case AOA_NOTIFY_LINE_IN: |
| 311 | notif = &rt->line_in_notify; |
| 312 | name = "linein-detect"; |
| 313 | irq = linein_detect_irq; |
| 314 | break; |
| 315 | case AOA_NOTIFY_LINE_OUT: |
| 316 | notif = &rt->line_out_notify; |
| 317 | name = "lineout-detect"; |
| 318 | irq = lineout_detect_irq; |
| 319 | break; |
| 320 | default: |
| 321 | return -EINVAL; |
| 322 | } |
| 323 | |
Johannes Berg | 2566d36 | 2006-07-25 16:12:51 +0200 | [diff] [blame] | 324 | if (irq == NO_IRQ) |
Johannes Berg | f3d9478 | 2006-06-21 15:42:43 +0200 | [diff] [blame] | 325 | return -ENODEV; |
| 326 | |
| 327 | mutex_lock(¬if->mutex); |
| 328 | |
| 329 | old = notif->notify; |
| 330 | |
| 331 | if (!old && !notify) { |
| 332 | err = 0; |
| 333 | goto out_unlock; |
| 334 | } |
| 335 | |
| 336 | if (old && notify) { |
| 337 | if (old == notify && notif->data == data) |
| 338 | err = 0; |
| 339 | goto out_unlock; |
| 340 | } |
| 341 | |
| 342 | if (old && !notify) |
| 343 | free_irq(irq, notif); |
| 344 | |
| 345 | if (!old && notify) { |
| 346 | err = request_irq(irq, ftr_handle_notify_irq, 0, name, notif); |
| 347 | if (err) |
| 348 | goto out_unlock; |
| 349 | } |
| 350 | |
| 351 | notif->notify = notify; |
| 352 | notif->data = data; |
| 353 | |
| 354 | err = 0; |
| 355 | out_unlock: |
| 356 | mutex_unlock(¬if->mutex); |
| 357 | return err; |
| 358 | } |
| 359 | |
| 360 | static int ftr_get_detect(struct gpio_runtime *rt, |
| 361 | enum notify_type type) |
| 362 | { |
| 363 | int gpio, ret, active; |
| 364 | |
| 365 | switch (type) { |
| 366 | case AOA_NOTIFY_HEADPHONE: |
| 367 | gpio = headphone_detect_gpio; |
| 368 | active = headphone_detect_gpio_activestate; |
| 369 | break; |
| 370 | case AOA_NOTIFY_LINE_IN: |
| 371 | gpio = linein_detect_gpio; |
| 372 | active = linein_detect_gpio_activestate; |
| 373 | break; |
| 374 | case AOA_NOTIFY_LINE_OUT: |
| 375 | gpio = lineout_detect_gpio; |
| 376 | active = lineout_detect_gpio_activestate; |
| 377 | break; |
| 378 | default: |
| 379 | return -EINVAL; |
| 380 | } |
| 381 | |
| 382 | if (gpio == -1) |
| 383 | return -ENODEV; |
| 384 | |
| 385 | ret = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, gpio, 0); |
| 386 | if (ret < 0) |
| 387 | return ret; |
| 388 | return ((ret >> 1) & 1) == active; |
| 389 | } |
| 390 | |
| 391 | static struct gpio_methods methods = { |
| 392 | .init = ftr_gpio_init, |
| 393 | .exit = ftr_gpio_exit, |
| 394 | .all_amps_off = ftr_gpio_all_amps_off, |
| 395 | .all_amps_restore = ftr_gpio_all_amps_restore, |
| 396 | .set_headphone = ftr_gpio_set_headphone, |
| 397 | .set_speakers = ftr_gpio_set_amp, |
| 398 | .set_lineout = ftr_gpio_set_lineout, |
| 399 | .set_hw_reset = ftr_gpio_set_hw_reset, |
| 400 | .get_headphone = ftr_gpio_get_headphone, |
| 401 | .get_speakers = ftr_gpio_get_amp, |
| 402 | .get_lineout = ftr_gpio_get_lineout, |
| 403 | .set_notify = ftr_set_notify, |
| 404 | .get_detect = ftr_get_detect, |
| 405 | }; |
| 406 | |
| 407 | struct gpio_methods *ftr_gpio_methods = &methods; |
| 408 | EXPORT_SYMBOL_GPL(ftr_gpio_methods); |