sound/aoa/core/gpio-feature.c

   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(&notif->mutex);
 213         if (notif->notify)
 214                 notif->notify(notif->data);
 215         mutex_unlock(&notif->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                  &amp_mute_gpio,
 236                  &amp_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(&rt->headphone_notify.work);
 291         cancel_delayed_work(&rt->line_in_notify.work);
 292         cancel_delayed_work(&rt->line_out_notify.work);
 293         flush_scheduled_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(&notif->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(&notif->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(&notif->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);