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