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 <linux/of_irq.h>
  14 #include <linux/interrupt.h>
  15 #include <asm/pmac_feature.h>
  16 #include "../aoa.h"
  17
  18 /* TODO: these are lots of global variables
  19  * that aren't used on most machines...
  20  * Move them into a dynamically allocated
  21  * structure and use that.
  22  */
  23
  24 /* these are the GPIO numbers (register addresses as offsets into
  25  * the GPIO space) */
  26 static int headphone_mute_gpio;
  27 static int master_mute_gpio;
  28 static int amp_mute_gpio;
  29 static int lineout_mute_gpio;
  30 static int hw_reset_gpio;
  31 static int lineout_detect_gpio;
  32 static int headphone_detect_gpio;
  33 static int linein_detect_gpio;
  34
  35 /* see the SWITCH_GPIO macro */
  36 static int headphone_mute_gpio_activestate;
  37 static int master_mute_gpio_activestate;
  38 static int amp_mute_gpio_activestate;
  39 static int lineout_mute_gpio_activestate;
  40 static int hw_reset_gpio_activestate;
  41 static int lineout_detect_gpio_activestate;
  42 static int headphone_detect_gpio_activestate;
  43 static int linein_detect_gpio_activestate;
  44
  45 /* node pointers that we save when getting the GPIO number
  46  * to get the interrupt later */
  47 static struct device_node *lineout_detect_node;
  48 static struct device_node *linein_detect_node;
  49 static struct device_node *headphone_detect_node;
  50
  51 static int lineout_detect_irq;
  52 static int linein_detect_irq;
  53 static int headphone_detect_irq;
  54
  55 static struct device_node *get_gpio(char *name,
  56                                     char *altname,
  57                                     int *gpioptr,
  58                                     int *gpioactiveptr)
  59 {
  60         struct device_node *np, *gpio;
  61         const u32 *reg;
  62         const char *audio_gpio;
  63
  64         *gpioptr = -1;
  65
  66         /* check if we can get it the easy way ... */
  67         np = of_find_node_by_name(NULL, name);
  68         if (!np) {
  69                 /* some machines have only gpioX/extint-gpioX nodes,
  70                  * and an audio-gpio property saying what it is ...
  71                  * So what we have to do is enumerate all children
  72                  * of the gpio node and check them all. */
  73                 gpio = of_find_node_by_name(NULL, "gpio");
  74                 if (!gpio)
  75                         return NULL;
  76                 while ((np = of_get_next_child(gpio, np))) {
  77                         audio_gpio = of_get_property(np, "audio-gpio", NULL);
  78                         if (!audio_gpio)
  79                                 continue;
  80                         if (strcmp(audio_gpio, name) == 0)
  81                                 break;
  82                         if (altname && (strcmp(audio_gpio, altname) == 0))
  83                                 break;
  84                 }
  85                 /* still not found, assume not there */
  86                 if (!np)
  87                         return NULL;
  88         }
  89
  90         reg = of_get_property(np, "reg", NULL);
  91         if (!reg)
  92                 return NULL;
  93
  94         *gpioptr = *reg;
  95
  96         /* this is a hack, usually the GPIOs 'reg' property
  97          * should have the offset based from the GPIO space
  98          * which is at 0x50, but apparently not always... */
  99         if (*gpioptr < 0x50)
 100                 *gpioptr += 0x50;
 101
 102         reg = of_get_property(np, "audio-gpio-active-state", NULL);
 103         if (!reg)
 104                 /* Apple seems to default to 1, but
 105                  * that doesn't seem right at least on most
 106                  * machines. So until proven that the opposite
 107                  * is necessary, we default to 0
 108                  * (which, incidentally, snd-powermac also does...) */
 109                 *gpioactiveptr = 0;
 110         else
 111                 *gpioactiveptr = *reg;
 112
 113         return np;
 114 }
 115
 116 static void get_irq(struct device_node * np, int *irqptr)
 117 {
 118         if (np)
 119                 *irqptr = irq_of_parse_and_map(np, 0);
 120         else
 121                 *irqptr = 0;
 122 }
 123
 124 /* 0x4 is outenable, 0x1 is out, thus 4 or 5 */
 125 #define SWITCH_GPIO(name, v, on)                                \
 126         (((v)&~1) | ((on)?                                      \
 127                         (name##_gpio_activestate==0?4:5):       \
 128                         (name##_gpio_activestate==0?5:4)))
 129
 130 #define FTR_GPIO(name, bit)                                     \
 131 static void ftr_gpio_set_##name(struct gpio_runtime *rt, int on)\
 132 {                                                               \
 133         int v;                                                  \
 134                                                                 \
 135         if (unlikely(!rt)) return;                              \
 136                                                                 \
 137         if (name##_mute_gpio < 0)                               \
 138                 return;                                         \
 139                                                                 \
 140         v = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL,         \
 141                               name##_mute_gpio,                 \
 142                               0);                               \
 143                                                                 \
 144         /* muted = !on... */                                    \
 145         v = SWITCH_GPIO(name##_mute, v, !on);                   \
 146                                                                 \
 147         pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL,            \
 148                           name##_mute_gpio, v);                 \
 149                                                                 \
 150         rt->implementation_private &= ~(1<<bit);                \
 151         rt->implementation_private |= (!!on << bit);            \
 152 }                                                               \
 153 static int ftr_gpio_get_##name(struct gpio_runtime *rt)         \
 154 {                                                               \
 155         if (unlikely(!rt)) return 0;                            \
 156         return (rt->implementation_private>>bit)&1;             \
 157 }
 158
 159 FTR_GPIO(headphone, 0);
 160 FTR_GPIO(amp, 1);
 161 FTR_GPIO(lineout, 2);
 162 FTR_GPIO(master, 3);
 163
 164 static void ftr_gpio_set_hw_reset(struct gpio_runtime *rt, int on)
 165 {
 166         int v;
 167
 168         if (unlikely(!rt)) return;
 169         if (hw_reset_gpio < 0)
 170                 return;
 171
 172         v = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL,
 173                               hw_reset_gpio, 0);
 174         v = SWITCH_GPIO(hw_reset, v, on);
 175         pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL,
 176                           hw_reset_gpio, v);
 177 }
 178
 179 static struct gpio_methods methods;
 180
 181 static void ftr_gpio_all_amps_off(struct gpio_runtime *rt)
 182 {
 183         int saved;
 184
 185         if (unlikely(!rt)) return;
 186         saved = rt->implementation_private;
 187         ftr_gpio_set_headphone(rt, 0);
 188         ftr_gpio_set_amp(rt, 0);
 189         ftr_gpio_set_lineout(rt, 0);
 190         if (methods.set_master)
 191                 ftr_gpio_set_master(rt, 0);
 192         rt->implementation_private = saved;
 193 }
 194
 195 static void ftr_gpio_all_amps_restore(struct gpio_runtime *rt)
 196 {
 197         int s;
 198
 199         if (unlikely(!rt)) return;
 200         s = rt->implementation_private;
 201         ftr_gpio_set_headphone(rt, (s>>0)&1);
 202         ftr_gpio_set_amp(rt, (s>>1)&1);
 203         ftr_gpio_set_lineout(rt, (s>>2)&1);
 204         if (methods.set_master)
 205                 ftr_gpio_set_master(rt, (s>>3)&1);
 206 }
 207
 208 static void ftr_handle_notify(struct work_struct *work)
 209 {
 210         struct gpio_notification *notif =
 211                 container_of(work, struct gpio_notification, work.work);
 212
 213         mutex_lock(&notif->mutex);
 214         if (notif->notify)
 215                 notif->notify(notif->data);
 216         mutex_unlock(&notif->mutex);
 217 }
 218
 219 static void gpio_enable_dual_edge(int gpio)
 220 {
 221         int v;
 222
 223         if (gpio == -1)
 224                 return;
 225         v = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, gpio, 0);
 226         v |= 0x80; /* enable dual edge */
 227         pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, gpio, v);
 228 }
 229
 230 static void ftr_gpio_init(struct gpio_runtime *rt)
 231 {
 232         get_gpio("headphone-mute", NULL,
 233                  &headphone_mute_gpio,
 234                  &headphone_mute_gpio_activestate);
 235         get_gpio("amp-mute", NULL,
 236                  &amp_mute_gpio,
 237                  &amp_mute_gpio_activestate);
 238         get_gpio("lineout-mute", NULL,
 239                  &lineout_mute_gpio,
 240                  &lineout_mute_gpio_activestate);
 241         get_gpio("hw-reset", "audio-hw-reset",
 242                  &hw_reset_gpio,
 243                  &hw_reset_gpio_activestate);
 244         if (get_gpio("master-mute", NULL,
 245                      &master_mute_gpio,
 246                      &master_mute_gpio_activestate)) {
 247                 methods.set_master = ftr_gpio_set_master;
 248                 methods.get_master = ftr_gpio_get_master;
 249         }
 250
 251         headphone_detect_node = get_gpio("headphone-detect", NULL,
 252                                          &headphone_detect_gpio,
 253                                          &headphone_detect_gpio_activestate);
 254         /* go Apple, and thanks for giving these different names
 255          * across the board... */
 256         lineout_detect_node = get_gpio("lineout-detect", "line-output-detect",
 257                                        &lineout_detect_gpio,
 258                                        &lineout_detect_gpio_activestate);
 259         linein_detect_node = get_gpio("linein-detect", "line-input-detect",
 260                                       &linein_detect_gpio,
 261                                       &linein_detect_gpio_activestate);
 262
 263         gpio_enable_dual_edge(headphone_detect_gpio);
 264         gpio_enable_dual_edge(lineout_detect_gpio);
 265         gpio_enable_dual_edge(linein_detect_gpio);
 266
 267         get_irq(headphone_detect_node, &headphone_detect_irq);
 268         get_irq(lineout_detect_node, &lineout_detect_irq);
 269         get_irq(linein_detect_node, &linein_detect_irq);
 270
 271         ftr_gpio_all_amps_off(rt);
 272         rt->implementation_private = 0;
 273         INIT_DELAYED_WORK(&rt->headphone_notify.work, ftr_handle_notify);
 274         INIT_DELAYED_WORK(&rt->line_in_notify.work, ftr_handle_notify);
 275         INIT_DELAYED_WORK(&rt->line_out_notify.work, ftr_handle_notify);
 276         mutex_init(&rt->headphone_notify.mutex);
 277         mutex_init(&rt->line_in_notify.mutex);
 278         mutex_init(&rt->line_out_notify.mutex);
 279 }
 280
 281 static void ftr_gpio_exit(struct gpio_runtime *rt)
 282 {
 283         ftr_gpio_all_amps_off(rt);
 284         rt->implementation_private = 0;
 285         if (rt->headphone_notify.notify)
 286                 free_irq(headphone_detect_irq, &rt->headphone_notify);
 287         if (rt->line_in_notify.gpio_private)
 288                 free_irq(linein_detect_irq, &rt->line_in_notify);
 289         if (rt->line_out_notify.gpio_private)
 290                 free_irq(lineout_detect_irq, &rt->line_out_notify);
 291         cancel_delayed_work_sync(&rt->headphone_notify.work);
 292         cancel_delayed_work_sync(&rt->line_in_notify.work);
 293         cancel_delayed_work_sync(&rt->line_out_notify.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)
 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);