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 <linux/of_irq.h> 14 #include <linux/interrupt.h> 15 #include <asm/pmac_feature.h> 16 #include "../aoa.h" 17 18 /* TODO: these are lots of global variables 19 * that aren't used on most machines... 20 * Move them into a dynamically allocated 21 * structure and use that. 22 */ 23 24 /* these are the GPIO numbers (register addresses as offsets into 25 * the GPIO space) */ 26 static int headphone_mute_gpio; 27 static int master_mute_gpio; 28 static int amp_mute_gpio; 29 static int lineout_mute_gpio; 30 static int hw_reset_gpio; 31 static int lineout_detect_gpio; 32 static int headphone_detect_gpio; 33 static int linein_detect_gpio; 34 35 /* see the SWITCH_GPIO macro */ 36 static int headphone_mute_gpio_activestate; 37 static int master_mute_gpio_activestate; 38 static int amp_mute_gpio_activestate; 39 static int lineout_mute_gpio_activestate; 40 static int hw_reset_gpio_activestate; 41 static int lineout_detect_gpio_activestate; 42 static int headphone_detect_gpio_activestate; 43 static int linein_detect_gpio_activestate; 44 45 /* node pointers that we save when getting the GPIO number 46 * to get the interrupt later */ 47 static struct device_node *lineout_detect_node; 48 static struct device_node *linein_detect_node; 49 static struct device_node *headphone_detect_node; 50 51 static int lineout_detect_irq; 52 static int linein_detect_irq; 53 static int headphone_detect_irq; 54 55 static struct device_node *get_gpio(char *name, 56 char *altname, 57 int *gpioptr, 58 int *gpioactiveptr) 59 { 60 struct device_node *np, *gpio; 61 const u32 *reg; 62 const char *audio_gpio; 63 64 *gpioptr = -1; 65 66 /* check if we can get it the easy way ... */ 67 np = of_find_node_by_name(NULL, name); 68 if (!np) { 69 /* some machines have only gpioX/extint-gpioX nodes, 70 * and an audio-gpio property saying what it is ... 71 * So what we have to do is enumerate all children 72 * of the gpio node and check them all. */ 73 gpio = of_find_node_by_name(NULL, "gpio"); 74 if (!gpio) 75 return NULL; 76 while ((np = of_get_next_child(gpio, np))) { 77 audio_gpio = of_get_property(np, "audio-gpio", NULL); 78 if (!audio_gpio) 79 continue; 80 if (strcmp(audio_gpio, name) == 0) 81 break; 82 if (altname && (strcmp(audio_gpio, altname) == 0)) 83 break; 84 } 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 return NULL; 93 94 *gpioptr = *reg; 95 96 /* this is a hack, usually the GPIOs 'reg' property 97 * should have the offset based from the GPIO space 98 * which is at 0x50, but apparently not always... */ 99 if (*gpioptr < 0x50) 100 *gpioptr += 0x50; 101 102 reg = of_get_property(np, "audio-gpio-active-state", NULL); 103 if (!reg) 104 /* Apple seems to default to 1, but 105 * that doesn't seem right at least on most 106 * machines. So until proven that the opposite 107 * is necessary, we default to 0 108 * (which, incidentally, snd-powermac also does...) */ 109 *gpioactiveptr = 0; 110 else 111 *gpioactiveptr = *reg; 112 113 return np; 114 } 115 116 static void get_irq(struct device_node * np, int *irqptr) 117 { 118 if (np) 119 *irqptr = irq_of_parse_and_map(np, 0); 120 else 121 *irqptr = NO_IRQ; 122 } 123 124 /* 0x4 is outenable, 0x1 is out, thus 4 or 5 */ 125 #define SWITCH_GPIO(name, v, on) \ 126 (((v)&~1) | ((on)? \ 127 (name##_gpio_activestate==0?4:5): \ 128 (name##_gpio_activestate==0?5:4))) 129 130 #define FTR_GPIO(name, bit) \ 131 static void ftr_gpio_set_##name(struct gpio_runtime *rt, int on)\ 132 { \ 133 int v; \ 134 \ 135 if (unlikely(!rt)) return; \ 136 \ 137 if (name##_mute_gpio < 0) \ 138 return; \ 139 \ 140 v = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, \ 141 name##_mute_gpio, \ 142 0); \ 143 \ 144 /* muted = !on... */ \ 145 v = SWITCH_GPIO(name##_mute, v, !on); \ 146 \ 147 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, \ 148 name##_mute_gpio, v); \ 149 \ 150 rt->implementation_private &= ~(1<<bit); \ 151 rt->implementation_private |= (!!on << bit); \ 152 } \ 153 static int ftr_gpio_get_##name(struct gpio_runtime *rt) \ 154 { \ 155 if (unlikely(!rt)) return 0; \ 156 return (rt->implementation_private>>bit)&1; \ 157 } 158 159 FTR_GPIO(headphone, 0); 160 FTR_GPIO(amp, 1); 161 FTR_GPIO(lineout, 2); 162 FTR_GPIO(master, 3); 163 164 static void ftr_gpio_set_hw_reset(struct gpio_runtime *rt, int on) 165 { 166 int v; 167 168 if (unlikely(!rt)) return; 169 if (hw_reset_gpio < 0) 170 return; 171 172 v = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, 173 hw_reset_gpio, 0); 174 v = SWITCH_GPIO(hw_reset, v, on); 175 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, 176 hw_reset_gpio, v); 177 } 178 179 static struct gpio_methods methods; 180 181 static void ftr_gpio_all_amps_off(struct gpio_runtime *rt) 182 { 183 int saved; 184 185 if (unlikely(!rt)) return; 186 saved = rt->implementation_private; 187 ftr_gpio_set_headphone(rt, 0); 188 ftr_gpio_set_amp(rt, 0); 189 ftr_gpio_set_lineout(rt, 0); 190 if (methods.set_master) 191 ftr_gpio_set_master(rt, 0); 192 rt->implementation_private = saved; 193 } 194 195 static void ftr_gpio_all_amps_restore(struct gpio_runtime *rt) 196 { 197 int s; 198 199 if (unlikely(!rt)) return; 200 s = rt->implementation_private; 201 ftr_gpio_set_headphone(rt, (s>>0)&1); 202 ftr_gpio_set_amp(rt, (s>>1)&1); 203 ftr_gpio_set_lineout(rt, (s>>2)&1); 204 if (methods.set_master) 205 ftr_gpio_set_master(rt, (s>>3)&1); 206 } 207 208 static void ftr_handle_notify(struct work_struct *work) 209 { 210 struct gpio_notification *notif = 211 container_of(work, struct gpio_notification, work.work); 212 213 mutex_lock(¬if->mutex); 214 if (notif->notify) 215 notif->notify(notif->data); 216 mutex_unlock(¬if->mutex); 217 } 218 219 static void gpio_enable_dual_edge(int gpio) 220 { 221 int v; 222 223 if (gpio == -1) 224 return; 225 v = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, gpio, 0); 226 v |= 0x80; /* enable dual edge */ 227 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, gpio, v); 228 } 229 230 static void ftr_gpio_init(struct gpio_runtime *rt) 231 { 232 get_gpio("headphone-mute", NULL, 233 &headphone_mute_gpio, 234 &headphone_mute_gpio_activestate); 235 get_gpio("amp-mute", NULL, 236 &_mute_gpio, 237 &_mute_gpio_activestate); 238 get_gpio("lineout-mute", NULL, 239 &lineout_mute_gpio, 240 &lineout_mute_gpio_activestate); 241 get_gpio("hw-reset", "audio-hw-reset", 242 &hw_reset_gpio, 243 &hw_reset_gpio_activestate); 244 if (get_gpio("master-mute", NULL, 245 &master_mute_gpio, 246 &master_mute_gpio_activestate)) { 247 methods.set_master = ftr_gpio_set_master; 248 methods.get_master = ftr_gpio_get_master; 249 } 250 251 headphone_detect_node = get_gpio("headphone-detect", NULL, 252 &headphone_detect_gpio, 253 &headphone_detect_gpio_activestate); 254 /* go Apple, and thanks for giving these different names 255 * across the board... */ 256 lineout_detect_node = get_gpio("lineout-detect", "line-output-detect", 257 &lineout_detect_gpio, 258 &lineout_detect_gpio_activestate); 259 linein_detect_node = get_gpio("linein-detect", "line-input-detect", 260 &linein_detect_gpio, 261 &linein_detect_gpio_activestate); 262 263 gpio_enable_dual_edge(headphone_detect_gpio); 264 gpio_enable_dual_edge(lineout_detect_gpio); 265 gpio_enable_dual_edge(linein_detect_gpio); 266 267 get_irq(headphone_detect_node, &headphone_detect_irq); 268 get_irq(lineout_detect_node, &lineout_detect_irq); 269 get_irq(linein_detect_node, &linein_detect_irq); 270 271 ftr_gpio_all_amps_off(rt); 272 rt->implementation_private = 0; 273 INIT_DELAYED_WORK(&rt->headphone_notify.work, ftr_handle_notify); 274 INIT_DELAYED_WORK(&rt->line_in_notify.work, ftr_handle_notify); 275 INIT_DELAYED_WORK(&rt->line_out_notify.work, ftr_handle_notify); 276 mutex_init(&rt->headphone_notify.mutex); 277 mutex_init(&rt->line_in_notify.mutex); 278 mutex_init(&rt->line_out_notify.mutex); 279 } 280 281 static void ftr_gpio_exit(struct gpio_runtime *rt) 282 { 283 ftr_gpio_all_amps_off(rt); 284 rt->implementation_private = 0; 285 if (rt->headphone_notify.notify) 286 free_irq(headphone_detect_irq, &rt->headphone_notify); 287 if (rt->line_in_notify.gpio_private) 288 free_irq(linein_detect_irq, &rt->line_in_notify); 289 if (rt->line_out_notify.gpio_private) 290 free_irq(lineout_detect_irq, &rt->line_out_notify); 291 cancel_delayed_work_sync(&rt->headphone_notify.work); 292 cancel_delayed_work_sync(&rt->line_in_notify.work); 293 cancel_delayed_work_sync(&rt->line_out_notify.work); 294 mutex_destroy(&rt->headphone_notify.mutex); 295 mutex_destroy(&rt->line_in_notify.mutex); 296 mutex_destroy(&rt->line_out_notify.mutex); 297 } 298 299 static irqreturn_t ftr_handle_notify_irq(int xx, void *data) 300 { 301 struct gpio_notification *notif = data; 302 303 schedule_delayed_work(¬if->work, 0); 304 305 return IRQ_HANDLED; 306 } 307 308 static int ftr_set_notify(struct gpio_runtime *rt, 309 enum notify_type type, 310 notify_func_t notify, 311 void *data) 312 { 313 struct gpio_notification *notif; 314 notify_func_t old; 315 int irq; 316 char *name; 317 int err = -EBUSY; 318 319 switch (type) { 320 case AOA_NOTIFY_HEADPHONE: 321 notif = &rt->headphone_notify; 322 name = "headphone-detect"; 323 irq = headphone_detect_irq; 324 break; 325 case AOA_NOTIFY_LINE_IN: 326 notif = &rt->line_in_notify; 327 name = "linein-detect"; 328 irq = linein_detect_irq; 329 break; 330 case AOA_NOTIFY_LINE_OUT: 331 notif = &rt->line_out_notify; 332 name = "lineout-detect"; 333 irq = lineout_detect_irq; 334 break; 335 default: 336 return -EINVAL; 337 } 338 339 if (irq == NO_IRQ) 340 return -ENODEV; 341 342 mutex_lock(¬if->mutex); 343 344 old = notif->notify; 345 346 if (!old && !notify) { 347 err = 0; 348 goto out_unlock; 349 } 350 351 if (old && notify) { 352 if (old == notify && notif->data == data) 353 err = 0; 354 goto out_unlock; 355 } 356 357 if (old && !notify) 358 free_irq(irq, notif); 359 360 if (!old && notify) { 361 err = request_irq(irq, ftr_handle_notify_irq, 0, name, notif); 362 if (err) 363 goto out_unlock; 364 } 365 366 notif->notify = notify; 367 notif->data = data; 368 369 err = 0; 370 out_unlock: 371 mutex_unlock(¬if->mutex); 372 return err; 373 } 374 375 static int ftr_get_detect(struct gpio_runtime *rt, 376 enum notify_type type) 377 { 378 int gpio, ret, active; 379 380 switch (type) { 381 case AOA_NOTIFY_HEADPHONE: 382 gpio = headphone_detect_gpio; 383 active = headphone_detect_gpio_activestate; 384 break; 385 case AOA_NOTIFY_LINE_IN: 386 gpio = linein_detect_gpio; 387 active = linein_detect_gpio_activestate; 388 break; 389 case AOA_NOTIFY_LINE_OUT: 390 gpio = lineout_detect_gpio; 391 active = lineout_detect_gpio_activestate; 392 break; 393 default: 394 return -EINVAL; 395 } 396 397 if (gpio == -1) 398 return -ENODEV; 399 400 ret = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, gpio, 0); 401 if (ret < 0) 402 return ret; 403 return ((ret >> 1) & 1) == active; 404 } 405 406 static struct gpio_methods methods = { 407 .init = ftr_gpio_init, 408 .exit = ftr_gpio_exit, 409 .all_amps_off = ftr_gpio_all_amps_off, 410 .all_amps_restore = ftr_gpio_all_amps_restore, 411 .set_headphone = ftr_gpio_set_headphone, 412 .set_speakers = ftr_gpio_set_amp, 413 .set_lineout = ftr_gpio_set_lineout, 414 .set_hw_reset = ftr_gpio_set_hw_reset, 415 .get_headphone = ftr_gpio_get_headphone, 416 .get_speakers = ftr_gpio_get_amp, 417 .get_lineout = ftr_gpio_get_lineout, 418 .set_notify = ftr_set_notify, 419 .get_detect = ftr_get_detect, 420 }; 421 422 struct gpio_methods *ftr_gpio_methods = &methods; 423 EXPORT_SYMBOL_GPL(ftr_gpio_methods); 424