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