git.oblomov.eu Git - linux-2.6/blob - 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 gpio_enable_dual_edge(int gpio)
 211 {
 212         int v;
 213
 214         if (gpio == -1)
 215                 return;
 216         v = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, gpio, 0);
 217         v |= 0x80; /* enable dual edge */
 218         pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, gpio, v);
 219 }
 220
 221 static void ftr_gpio_init(struct gpio_runtime *rt)
 222 {
 223         get_gpio("headphone-mute", NULL,
 224                  &headphone_mute_gpio,
 225                  &headphone_mute_gpio_activestate);
 226         get_gpio("amp-mute", NULL,
 227                  &amp_mute_gpio,
 228                  &amp_mute_gpio_activestate);
 229         get_gpio("lineout-mute", NULL,
 230                  &lineout_mute_gpio,
 231                  &lineout_mute_gpio_activestate);
 232         get_gpio("hw-reset", "audio-hw-reset",
 233                  &hw_reset_gpio,
 234                  &hw_reset_gpio_activestate);
 235
 236         headphone_detect_node = get_gpio("headphone-detect", NULL,
 237                                          &headphone_detect_gpio,
 238                                          &headphone_detect_gpio_activestate);
 239         /* go Apple, and thanks for giving these different names
 240          * across the board... */
 241         lineout_detect_node = get_gpio("lineout-detect", "line-output-detect",
 242                                        &lineout_detect_gpio,
 243                                        &lineout_detect_gpio_activestate);
 244         linein_detect_node = get_gpio("linein-detect", "line-input-detect",
 245                                       &linein_detect_gpio,
 246                                       &linein_detect_gpio_activestate);
 247
 248         gpio_enable_dual_edge(headphone_detect_gpio);
 249         gpio_enable_dual_edge(lineout_detect_gpio);
 250         gpio_enable_dual_edge(linein_detect_gpio);
 251
 252         get_irq(headphone_detect_node, &headphone_detect_irq);
 253         get_irq(lineout_detect_node, &lineout_detect_irq);
 254         get_irq(linein_detect_node, &linein_detect_irq);
 255
 256         ftr_gpio_all_amps_off(rt);
 257         rt->implementation_private = 0;
 258         INIT_WORK(&rt->headphone_notify.work, ftr_handle_notify,
 259                   &rt->headphone_notify);
 260         INIT_WORK(&rt->line_in_notify.work, ftr_handle_notify,
 261                   &rt->line_in_notify);
 262         INIT_WORK(&rt->line_out_notify.work, ftr_handle_notify,
 263                   &rt->line_out_notify);
 264         mutex_init(&rt->headphone_notify.mutex);
 265         mutex_init(&rt->line_in_notify.mutex);
 266         mutex_init(&rt->line_out_notify.mutex);
 267 }
 268
 269 static void ftr_gpio_exit(struct gpio_runtime *rt)
 270 {
 271         ftr_gpio_all_amps_off(rt);
 272         rt->implementation_private = 0;
 273         if (rt->headphone_notify.notify)
 274                 free_irq(headphone_detect_irq, &rt->headphone_notify);
 275         if (rt->line_in_notify.gpio_private)
 276                 free_irq(linein_detect_irq, &rt->line_in_notify);
 277         if (rt->line_out_notify.gpio_private)
 278                 free_irq(lineout_detect_irq, &rt->line_out_notify);
 279         cancel_delayed_work(&rt->headphone_notify.work);
 280         cancel_delayed_work(&rt->line_in_notify.work);
 281         cancel_delayed_work(&rt->line_out_notify.work);
 282         flush_scheduled_work();
 283         mutex_destroy(&rt->headphone_notify.mutex);
 284         mutex_destroy(&rt->line_in_notify.mutex);
 285         mutex_destroy(&rt->line_out_notify.mutex);
 286 }
 287
 288 static irqreturn_t ftr_handle_notify_irq(int xx,
 289                                          void *data,
 290                                          struct pt_regs *regs)
 291 {
 292         struct gpio_notification *notif = data;
 293
 294         schedule_work(&notif->work);
 295
 296         return IRQ_HANDLED;
 297 }
 298
 299 static int ftr_set_notify(struct gpio_runtime *rt,
 300                           enum notify_type type,
 301                           notify_func_t notify,
 302                           void *data)
 303 {
 304         struct gpio_notification *notif;
 305         notify_func_t old;
 306         int irq;
 307         char *name;
 308         int err = -EBUSY;
 309
 310         switch (type) {
 311         case AOA_NOTIFY_HEADPHONE:
 312                 notif = &rt->headphone_notify;
 313                 name = "headphone-detect";
 314                 irq = headphone_detect_irq;
 315                 break;
 316         case AOA_NOTIFY_LINE_IN:
 317                 notif = &rt->line_in_notify;
 318                 name = "linein-detect";
 319                 irq = linein_detect_irq;
 320                 break;
 321         case AOA_NOTIFY_LINE_OUT:
 322                 notif = &rt->line_out_notify;
 323                 name = "lineout-detect";
 324                 irq = lineout_detect_irq;
 325                 break;
 326         default:
 327                 return -EINVAL;
 328         }
 329
 330         if (irq == -1)
 331                 return -ENODEV;
 332
 333         mutex_lock(&notif->mutex);
 334
 335         old = notif->notify;
 336
 337         if (!old && !notify) {
 338                 err = 0;
 339                 goto out_unlock;
 340         }
 341
 342         if (old && notify) {
 343                 if (old == notify && notif->data == data)
 344                         err = 0;
 345                 goto out_unlock;
 346         }
 347
 348         if (old && !notify)
 349                 free_irq(irq, notif);
 350
 351         if (!old && notify) {
 352                 err = request_irq(irq, ftr_handle_notify_irq, 0, name, notif);
 353                 if (err)
 354                         goto out_unlock;
 355         }
 356
 357         notif->notify = notify;
 358         notif->data = data;
 359
 360         err = 0;
 361  out_unlock:
 362         mutex_unlock(&notif->mutex);
 363         return err;
 364 }
 365
 366 static int ftr_get_detect(struct gpio_runtime *rt,
 367                           enum notify_type type)
 368 {
 369         int gpio, ret, active;
 370
 371         switch (type) {
 372         case AOA_NOTIFY_HEADPHONE:
 373                 gpio = headphone_detect_gpio;
 374                 active = headphone_detect_gpio_activestate;
 375                 break;
 376         case AOA_NOTIFY_LINE_IN:
 377                 gpio = linein_detect_gpio;
 378                 active = linein_detect_gpio_activestate;
 379                 break;
 380         case AOA_NOTIFY_LINE_OUT:
 381                 gpio = lineout_detect_gpio;
 382                 active = lineout_detect_gpio_activestate;
 383                 break;
 384         default:
 385                 return -EINVAL;
 386         }
 387
 388         if (gpio == -1)
 389                 return -ENODEV;
 390
 391         ret = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, gpio, 0);
 392         if (ret < 0)
 393                 return ret;
 394         return ((ret >> 1) & 1) == active;
 395 }
 396
 397 static struct gpio_methods methods = {
 398         .init                   = ftr_gpio_init,
 399         .exit                   = ftr_gpio_exit,
 400         .all_amps_off           = ftr_gpio_all_amps_off,
 401         .all_amps_restore       = ftr_gpio_all_amps_restore,
 402         .set_headphone          = ftr_gpio_set_headphone,
 403         .set_speakers           = ftr_gpio_set_amp,
 404         .set_lineout            = ftr_gpio_set_lineout,
 405         .set_hw_reset           = ftr_gpio_set_hw_reset,
 406         .get_headphone          = ftr_gpio_get_headphone,
 407         .get_speakers           = ftr_gpio_get_amp,
 408         .get_lineout            = ftr_gpio_get_lineout,
 409         .set_notify             = ftr_set_notify,
 410         .get_detect             = ftr_get_detect,
 411 };
 412
 413 struct gpio_methods *ftr_gpio_methods = &methods;
 414 EXPORT_SYMBOL_GPL(ftr_gpio_methods);