sound/aoa/core/snd-aoa-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 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;
  58         u32 *reg;
  59         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 = 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 = (u32 *)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 = (u32 *)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
 113 static void get_irq(struct device_node * np, int *irqptr)
 114 {
 115         *irqptr = irq_of_parse_and_map(np, 0);
 116 }
 117
 118 /* 0x4 is outenable, 0x1 is out, thus 4 or 5 */
 119 #define SWITCH_GPIO(name, v, on)                                \
 120         (((v)&~1) | ((on)?                                      \
 121                         (name##_gpio_activestate==0?4:5):       \
 122                         (name##_gpio_activestate==0?5:4)))
 123
 124 #define FTR_GPIO(name, bit)                                     \
 125 static void ftr_gpio_set_##name(struct gpio_runtime *rt, int on)\
 126 {                                                               \
 127         int v;                                                  \
 128                                                                 \
 129         if (unlikely(!rt)) return;                              \
 130                                                                 \
 131         if (name##_mute_gpio < 0)                               \
 132                 return;                                         \
 133                                                                 \
 134         v = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL,         \
 135                               name##_mute_gpio,                 \
 136                               0);                               \
 137                                                                 \
 138         /* muted = !on... */                                    \
 139         v = SWITCH_GPIO(name##_mute, v, !on);                   \
 140                                                                 \
 141         pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL,            \
 142                           name##_mute_gpio, v);                 \
 143                                                                 \
 144         rt->implementation_private &= ~(1<<bit);                \
 145         rt->implementation_private |= (!!on << bit);            \
 146 }                                                               \
 147 static int ftr_gpio_get_##name(struct gpio_runtime *rt)         \
 148 {                                                               \
 149         if (unlikely(!rt)) return 0;                            \
 150         return (rt->implementation_private>>bit)&1;             \
 151 }
 152
 153 FTR_GPIO(headphone, 0);
 154 FTR_GPIO(amp, 1);
 155 FTR_GPIO(lineout, 2);
 156
 157 static void ftr_gpio_set_hw_reset(struct gpio_runtime *rt, int on)
 158 {
 159         int v;
 160
 161         if (unlikely(!rt)) return;
 162         if (hw_reset_gpio < 0)
 163                 return;
 164
 165         v = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL,
 166                               hw_reset_gpio, 0);
 167         v = SWITCH_GPIO(hw_reset, v, on);
 168         pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL,
 169                           hw_reset_gpio, v);
 170 }
 171
 172 static void ftr_gpio_all_amps_off(struct gpio_runtime *rt)
 173 {
 174         int saved;
 175
 176         if (unlikely(!rt)) return;
 177         saved = rt->implementation_private;
 178         ftr_gpio_set_headphone(rt, 0);
 179         ftr_gpio_set_amp(rt, 0);
 180         ftr_gpio_set_lineout(rt, 0);
 181         rt->implementation_private = saved;
 182 }
 183
 184 static void ftr_gpio_all_amps_restore(struct gpio_runtime *rt)
 185 {
 186         int s;
 187
 188         if (unlikely(!rt)) return;
 189         s = rt->implementation_private;
 190         ftr_gpio_set_headphone(rt, (s>>0)&1);
 191         ftr_gpio_set_amp(rt, (s>>1)&1);
 192         ftr_gpio_set_lineout(rt, (s>>2)&1);
 193 }
 194
 195 static void ftr_handle_notify(void *data)
 196 {
 197         struct gpio_notification *notif = data;
 198
 199         mutex_lock(&notif->mutex);
 200         if (notif->notify)
 201                 notif->notify(notif->data);
 202         mutex_unlock(&notif->mutex);
 203 }
 204
 205 static void gpio_enable_dual_edge(int gpio)
 206 {
 207         int v;
 208
 209         if (gpio == -1)
 210                 return;
 211         v = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, gpio, 0);
 212         v |= 0x80; /* enable dual edge */
 213         pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, gpio, v);
 214 }
 215
 216 static void ftr_gpio_init(struct gpio_runtime *rt)
 217 {
 218         get_gpio("headphone-mute", NULL,
 219                  &headphone_mute_gpio,
 220                  &headphone_mute_gpio_activestate);
 221         get_gpio("amp-mute", NULL,
 222                  &amp_mute_gpio,
 223                  &amp_mute_gpio_activestate);
 224         get_gpio("lineout-mute", NULL,
 225                  &lineout_mute_gpio,
 226                  &lineout_mute_gpio_activestate);
 227         get_gpio("hw-reset", "audio-hw-reset",
 228                  &hw_reset_gpio,
 229                  &hw_reset_gpio_activestate);
 230
 231         headphone_detect_node = get_gpio("headphone-detect", NULL,
 232                                          &headphone_detect_gpio,
 233                                          &headphone_detect_gpio_activestate);
 234         /* go Apple, and thanks for giving these different names
 235          * across the board... */
 236         lineout_detect_node = get_gpio("lineout-detect", "line-output-detect",
 237                                        &lineout_detect_gpio,
 238                                        &lineout_detect_gpio_activestate);
 239         linein_detect_node = get_gpio("linein-detect", "line-input-detect",
 240                                       &linein_detect_gpio,
 241                                       &linein_detect_gpio_activestate);
 242
 243         gpio_enable_dual_edge(headphone_detect_gpio);
 244         gpio_enable_dual_edge(lineout_detect_gpio);
 245         gpio_enable_dual_edge(linein_detect_gpio);
 246
 247         get_irq(headphone_detect_node, &headphone_detect_irq);
 248         get_irq(lineout_detect_node, &lineout_detect_irq);
 249         get_irq(linein_detect_node, &linein_detect_irq);
 250
 251         ftr_gpio_all_amps_off(rt);
 252         rt->implementation_private = 0;
 253         INIT_WORK(&rt->headphone_notify.work, ftr_handle_notify,
 254                   &rt->headphone_notify);
 255         INIT_WORK(&rt->line_in_notify.work, ftr_handle_notify,
 256                   &rt->line_in_notify);
 257         INIT_WORK(&rt->line_out_notify.work, ftr_handle_notify,
 258                   &rt->line_out_notify);
 259         mutex_init(&rt->headphone_notify.mutex);
 260         mutex_init(&rt->line_in_notify.mutex);
 261         mutex_init(&rt->line_out_notify.mutex);
 262 }
 263
 264 static void ftr_gpio_exit(struct gpio_runtime *rt)
 265 {
 266         ftr_gpio_all_amps_off(rt);
 267         rt->implementation_private = 0;
 268         if (rt->headphone_notify.notify)
 269                 free_irq(headphone_detect_irq, &rt->headphone_notify);
 270         if (rt->line_in_notify.gpio_private)
 271                 free_irq(linein_detect_irq, &rt->line_in_notify);
 272         if (rt->line_out_notify.gpio_private)
 273                 free_irq(lineout_detect_irq, &rt->line_out_notify);
 274         cancel_delayed_work(&rt->headphone_notify.work);
 275         cancel_delayed_work(&rt->line_in_notify.work);
 276         cancel_delayed_work(&rt->line_out_notify.work);
 277         flush_scheduled_work();
 278         mutex_destroy(&rt->headphone_notify.mutex);
 279         mutex_destroy(&rt->line_in_notify.mutex);
 280         mutex_destroy(&rt->line_out_notify.mutex);
 281 }
 282
 283 static irqreturn_t ftr_handle_notify_irq(int xx,
 284                                          void *data,
 285                                          struct pt_regs *regs)
 286 {
 287         struct gpio_notification *notif = data;
 288
 289         schedule_work(&notif->work);
 290
 291         return IRQ_HANDLED;
 292 }
 293
 294 static int ftr_set_notify(struct gpio_runtime *rt,
 295                           enum notify_type type,
 296                           notify_func_t notify,
 297                           void *data)
 298 {
 299         struct gpio_notification *notif;
 300         notify_func_t old;
 301         int irq;
 302         char *name;
 303         int err = -EBUSY;
 304
 305         switch (type) {
 306         case AOA_NOTIFY_HEADPHONE:
 307                 notif = &rt->headphone_notify;
 308                 name = "headphone-detect";
 309                 irq = headphone_detect_irq;
 310                 break;
 311         case AOA_NOTIFY_LINE_IN:
 312                 notif = &rt->line_in_notify;
 313                 name = "linein-detect";
 314                 irq = linein_detect_irq;
 315                 break;
 316         case AOA_NOTIFY_LINE_OUT:
 317                 notif = &rt->line_out_notify;
 318                 name = "lineout-detect";
 319                 irq = lineout_detect_irq;
 320                 break;
 321         default:
 322                 return -EINVAL;
 323         }
 324
 325         if (irq == -1)
 326                 return -ENODEV;
 327
 328         mutex_lock(&notif->mutex);
 329
 330         old = notif->notify;
 331
 332         if (!old && !notify) {
 333                 err = 0;
 334                 goto out_unlock;
 335         }
 336
 337         if (old && notify) {
 338                 if (old == notify && notif->data == data)
 339                         err = 0;
 340                 goto out_unlock;
 341         }
 342
 343         if (old && !notify)
 344                 free_irq(irq, notif);
 345
 346         if (!old && notify) {
 347                 err = request_irq(irq, ftr_handle_notify_irq, 0, name, notif);
 348                 if (err)
 349                         goto out_unlock;
 350         }
 351
 352         notif->notify = notify;
 353         notif->data = data;
 354
 355         err = 0;
 356  out_unlock:
 357         mutex_unlock(&notif->mutex);
 358         return err;
 359 }
 360
 361 static int ftr_get_detect(struct gpio_runtime *rt,
 362                           enum notify_type type)
 363 {
 364         int gpio, ret, active;
 365
 366         switch (type) {
 367         case AOA_NOTIFY_HEADPHONE:
 368                 gpio = headphone_detect_gpio;
 369                 active = headphone_detect_gpio_activestate;
 370                 break;
 371         case AOA_NOTIFY_LINE_IN:
 372                 gpio = linein_detect_gpio;
 373                 active = linein_detect_gpio_activestate;
 374                 break;
 375         case AOA_NOTIFY_LINE_OUT:
 376                 gpio = lineout_detect_gpio;
 377                 active = lineout_detect_gpio_activestate;
 378                 break;
 379         default:
 380                 return -EINVAL;
 381         }
 382
 383         if (gpio == -1)
 384                 return -ENODEV;
 385
 386         ret = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, gpio, 0);
 387         if (ret < 0)
 388                 return ret;
 389         return ((ret >> 1) & 1) == active;
 390 }
 391
 392 static struct gpio_methods methods = {
 393         .init                   = ftr_gpio_init,
 394         .exit                   = ftr_gpio_exit,
 395         .all_amps_off           = ftr_gpio_all_amps_off,
 396         .all_amps_restore       = ftr_gpio_all_amps_restore,
 397         .set_headphone          = ftr_gpio_set_headphone,
 398         .set_speakers           = ftr_gpio_set_amp,
 399         .set_lineout            = ftr_gpio_set_lineout,
 400         .set_hw_reset           = ftr_gpio_set_hw_reset,
 401         .get_headphone          = ftr_gpio_get_headphone,
 402         .get_speakers           = ftr_gpio_get_amp,
 403         .get_lineout            = ftr_gpio_get_lineout,
 404         .set_notify             = ftr_set_notify,
 405         .get_detect             = ftr_get_detect,
 406 };
 407
 408 struct gpio_methods *ftr_gpio_methods = &methods;
 409 EXPORT_SYMBOL_GPL(ftr_gpio_methods);