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) */ 25static int headphone_mute_gpio; 26static int amp_mute_gpio; 27static int lineout_mute_gpio; 28static int hw_reset_gpio; 29static int lineout_detect_gpio; 30static int headphone_detect_gpio; 31static int linein_detect_gpio; 32 33/* see the SWITCH_GPIO macro */ 34static int headphone_mute_gpio_activestate; 35static int amp_mute_gpio_activestate; 36static int lineout_mute_gpio_activestate; 37static int hw_reset_gpio_activestate; 38static int lineout_detect_gpio_activestate; 39static int headphone_detect_gpio_activestate; 40static int linein_detect_gpio_activestate; 41 42/* node pointers that we save when getting the GPIO number 43 * to get the interrupt later */ 44static struct device_node *lineout_detect_node; 45static struct device_node *linein_detect_node; 46static struct device_node *headphone_detect_node; 47 48static int lineout_detect_irq; 49static int linein_detect_irq; 50static int headphone_detect_irq; 51 52static struct device_node *get_gpio(char *name, 53 char *altname, 54 int *gpioptr, 55 int *gpioactiveptr) 56{ 57 struct device_node *np, *gpio; 58 const u32 *reg; 59 const char *audio_gpio; 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 = of_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 87 reg = of_get_property(np, "reg", NULL); 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 99 reg = of_get_property(np, "audio-gpio-active-state", NULL); 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 113static void get_irq(struct device_node * np, int *irqptr) 114{ 115 if (np) 116 *irqptr = irq_of_parse_and_map(np, 0); 117 else 118 *irqptr = NO_IRQ; 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) \ 128static 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} \ 150static 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 156FTR_GPIO(headphone, 0); 157FTR_GPIO(amp, 1); 158FTR_GPIO(lineout, 2); 159 160static 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 175static 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 187static 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 198static void ftr_handle_notify(struct work_struct *work) 199{ 200 struct gpio_notification *notif = 201 container_of(work, struct gpio_notification, work.work); 202 203 mutex_lock(¬if->mutex); 204 if (notif->notify) 205 notif->notify(notif->data); 206 mutex_unlock(¬if->mutex); 207} 208 209static 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 220static 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); 246 247 gpio_enable_dual_edge(headphone_detect_gpio); 248 gpio_enable_dual_edge(lineout_detect_gpio); 249 gpio_enable_dual_edge(linein_detect_gpio); 250 251 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; 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); 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 265static 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 284static irqreturn_t ftr_handle_notify_irq(int xx, void *data) 285{ 286 struct gpio_notification *notif = data; 287 288 schedule_delayed_work(¬if->work, 0); 289 290 return IRQ_HANDLED; 291} 292 293static 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 } 323 324 if (irq == NO_IRQ) 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 360static 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 391static 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 407struct gpio_methods *ftr_gpio_methods = &methods; 408EXPORT_SYMBOL_GPL(ftr_gpio_methods); 409