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gpio-feature.c

/*
 * Apple Onboard Audio feature call GPIO control
 *
 * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
 *
 * GPL v2, can be found in COPYING.
 *
 * This file contains the GPIO control routines for
 * direct (through feature calls) access to the GPIO
 * registers.
 */

#include <asm/pmac_feature.h>
#include <linux/interrupt.h>
#include "../aoa.h"

/* TODO: these are lots of global variables
 * that aren't used on most machines...
 * Move them into a dynamically allocated
 * structure and use that.
 */

/* these are the GPIO numbers (register addresses as offsets into
 * the GPIO space) */
static int headphone_mute_gpio;
static int master_mute_gpio;
static int amp_mute_gpio;
static int lineout_mute_gpio;
static int hw_reset_gpio;
static int lineout_detect_gpio;
static int headphone_detect_gpio;
static int linein_detect_gpio;

/* see the SWITCH_GPIO macro */
static int headphone_mute_gpio_activestate;
static int master_mute_gpio_activestate;
static int amp_mute_gpio_activestate;
static int lineout_mute_gpio_activestate;
static int hw_reset_gpio_activestate;
static int lineout_detect_gpio_activestate;
static int headphone_detect_gpio_activestate;
static int linein_detect_gpio_activestate;

/* node pointers that we save when getting the GPIO number
 * to get the interrupt later */
static struct device_node *lineout_detect_node;
static struct device_node *linein_detect_node;
static struct device_node *headphone_detect_node;

static int lineout_detect_irq;
static int linein_detect_irq;
static int headphone_detect_irq;

static struct device_node *get_gpio(char *name,
                            char *altname,
                            int *gpioptr,
                            int *gpioactiveptr)
{
      struct device_node *np, *gpio;
      const u32 *reg;
      const char *audio_gpio;

      *gpioptr = -1;

      /* check if we can get it the easy way ... */
      np = of_find_node_by_name(NULL, name);
      if (!np) {
            /* some machines have only gpioX/extint-gpioX nodes,
             * and an audio-gpio property saying what it is ...
             * So what we have to do is enumerate all children
             * of the gpio node and check them all. */
            gpio = of_find_node_by_name(NULL, "gpio");
            if (!gpio)
                  return NULL;
            while ((np = of_get_next_child(gpio, np))) {
                  audio_gpio = of_get_property(np, "audio-gpio", NULL);
                  if (!audio_gpio)
                        continue;
                  if (strcmp(audio_gpio, name) == 0)
                        break;
                  if (altname && (strcmp(audio_gpio, altname) == 0))
                        break;
            }
            /* still not found, assume not there */
            if (!np)
                  return NULL;
      }

      reg = of_get_property(np, "reg", NULL);
      if (!reg)
            return NULL;

      *gpioptr = *reg;

      /* this is a hack, usually the GPIOs 'reg' property
       * should have the offset based from the GPIO space
       * which is at 0x50, but apparently not always... */
      if (*gpioptr < 0x50)
            *gpioptr += 0x50;

      reg = of_get_property(np, "audio-gpio-active-state", NULL);
      if (!reg)
            /* Apple seems to default to 1, but
             * that doesn't seem right at least on most
             * machines. So until proven that the opposite
             * is necessary, we default to 0
             * (which, incidentally, snd-powermac also does...) */
            *gpioactiveptr = 0;
      else
            *gpioactiveptr = *reg;

      return np;
}

static void get_irq(struct device_node * np, int *irqptr)
{
      if (np)
            *irqptr = irq_of_parse_and_map(np, 0);
      else
            *irqptr = NO_IRQ;
}

/* 0x4 is outenable, 0x1 is out, thus 4 or 5 */
#define SWITCH_GPIO(name, v, on)                      \
      (((v)&~1) | ((on)?                              \
                  (name##_gpio_activestate==0?4:5):   \
                  (name##_gpio_activestate==0?5:4)))

#define FTR_GPIO(name, bit)                           \
static void ftr_gpio_set_##name(struct gpio_runtime *rt, int on)\
{                                               \
      int v;                                          \
                                                \
      if (unlikely(!rt)) return;                      \
                                                \
      if (name##_mute_gpio < 0)                       \
            return;                                   \
                                                \
      v = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL,       \
                        name##_mute_gpio,             \
                        0);                     \
                                                \
      /* muted = !on... */                            \
      v = SWITCH_GPIO(name##_mute, v, !on);                 \
                                                \
      pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL,          \
                    name##_mute_gpio, v);             \
                                                \
      rt->implementation_private &= ~(1<<bit);        \
      rt->implementation_private |= (!!on << bit);          \
}                                               \
static int ftr_gpio_get_##name(struct gpio_runtime *rt)           \
{                                               \
      if (unlikely(!rt)) return 0;                    \
      return (rt->implementation_private>>bit)&1;           \
}

FTR_GPIO(headphone, 0);
FTR_GPIO(amp, 1);
FTR_GPIO(lineout, 2);
FTR_GPIO(master, 3);

static void ftr_gpio_set_hw_reset(struct gpio_runtime *rt, int on)
{
      int v;

      if (unlikely(!rt)) return;
      if (hw_reset_gpio < 0)
            return;

      v = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL,
                        hw_reset_gpio, 0);
      v = SWITCH_GPIO(hw_reset, v, on);
      pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL,
                    hw_reset_gpio, v);
}

static struct gpio_methods methods;

static void ftr_gpio_all_amps_off(struct gpio_runtime *rt)
{
      int saved;

      if (unlikely(!rt)) return;
      saved = rt->implementation_private;
      ftr_gpio_set_headphone(rt, 0);
      ftr_gpio_set_amp(rt, 0);
      ftr_gpio_set_lineout(rt, 0);
      if (methods.set_master)
            ftr_gpio_set_master(rt, 0);
      rt->implementation_private = saved;
}

static void ftr_gpio_all_amps_restore(struct gpio_runtime *rt)
{
      int s;

      if (unlikely(!rt)) return;
      s = rt->implementation_private;
      ftr_gpio_set_headphone(rt, (s>>0)&1);
      ftr_gpio_set_amp(rt, (s>>1)&1);
      ftr_gpio_set_lineout(rt, (s>>2)&1);
      if (methods.set_master)
            ftr_gpio_set_master(rt, (s>>3)&1);
}

static void ftr_handle_notify(struct work_struct *work)
{
      struct gpio_notification *notif =
            container_of(work, struct gpio_notification, work.work);

      mutex_lock(&notif->mutex);
      if (notif->notify)
            notif->notify(notif->data);
      mutex_unlock(&notif->mutex);
}

static void gpio_enable_dual_edge(int gpio)
{
      int v;

      if (gpio == -1)
            return;
      v = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, gpio, 0);
      v |= 0x80; /* enable dual edge */
      pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, gpio, v);
}

static void ftr_gpio_init(struct gpio_runtime *rt)
{
      get_gpio("headphone-mute", NULL,
             &headphone_mute_gpio,
             &headphone_mute_gpio_activestate);
      get_gpio("amp-mute", NULL,
             &amp_mute_gpio,
             &amp_mute_gpio_activestate);
      get_gpio("lineout-mute", NULL,
             &lineout_mute_gpio,
             &lineout_mute_gpio_activestate);
      get_gpio("hw-reset", "audio-hw-reset",
             &hw_reset_gpio,
             &hw_reset_gpio_activestate);
      if (get_gpio("master-mute", NULL,
                 &master_mute_gpio,
                 &master_mute_gpio_activestate)) {
            methods.set_master = ftr_gpio_set_master;
            methods.get_master = ftr_gpio_get_master;
      }

      headphone_detect_node = get_gpio("headphone-detect", NULL,
                               &headphone_detect_gpio,
                               &headphone_detect_gpio_activestate);
      /* go Apple, and thanks for giving these different names
       * across the board... */
      lineout_detect_node = get_gpio("lineout-detect", "line-output-detect",
                               &lineout_detect_gpio,
                               &lineout_detect_gpio_activestate);
      linein_detect_node = get_gpio("linein-detect", "line-input-detect",
                              &linein_detect_gpio,
                              &linein_detect_gpio_activestate);

      gpio_enable_dual_edge(headphone_detect_gpio);
      gpio_enable_dual_edge(lineout_detect_gpio);
      gpio_enable_dual_edge(linein_detect_gpio);

      get_irq(headphone_detect_node, &headphone_detect_irq);
      get_irq(lineout_detect_node, &lineout_detect_irq);
      get_irq(linein_detect_node, &linein_detect_irq);

      ftr_gpio_all_amps_off(rt);
      rt->implementation_private = 0;
      INIT_DELAYED_WORK(&rt->headphone_notify.work, ftr_handle_notify);
      INIT_DELAYED_WORK(&rt->line_in_notify.work, ftr_handle_notify);
      INIT_DELAYED_WORK(&rt->line_out_notify.work, ftr_handle_notify);
      mutex_init(&rt->headphone_notify.mutex);
      mutex_init(&rt->line_in_notify.mutex);
      mutex_init(&rt->line_out_notify.mutex);
}

static void ftr_gpio_exit(struct gpio_runtime *rt)
{
      ftr_gpio_all_amps_off(rt);
      rt->implementation_private = 0;
      if (rt->headphone_notify.notify)
            free_irq(headphone_detect_irq, &rt->headphone_notify);
      if (rt->line_in_notify.gpio_private)
            free_irq(linein_detect_irq, &rt->line_in_notify);
      if (rt->line_out_notify.gpio_private)
            free_irq(lineout_detect_irq, &rt->line_out_notify);
      cancel_delayed_work(&rt->headphone_notify.work);
      cancel_delayed_work(&rt->line_in_notify.work);
      cancel_delayed_work(&rt->line_out_notify.work);
      flush_scheduled_work();
      mutex_destroy(&rt->headphone_notify.mutex);
      mutex_destroy(&rt->line_in_notify.mutex);
      mutex_destroy(&rt->line_out_notify.mutex);
}

static irqreturn_t ftr_handle_notify_irq(int xx, void *data)
{
      struct gpio_notification *notif = data;

      schedule_delayed_work(&notif->work, 0);

      return IRQ_HANDLED;
}

static int ftr_set_notify(struct gpio_runtime *rt,
                    enum notify_type type,
                    notify_func_t notify,
                    void *data)
{
      struct gpio_notification *notif;
      notify_func_t old;
      int irq;
      char *name;
      int err = -EBUSY;

      switch (type) {
      case AOA_NOTIFY_HEADPHONE:
            notif = &rt->headphone_notify;
            name = "headphone-detect";
            irq = headphone_detect_irq;
            break;
      case AOA_NOTIFY_LINE_IN:
            notif = &rt->line_in_notify;
            name = "linein-detect";
            irq = linein_detect_irq;
            break;
      case AOA_NOTIFY_LINE_OUT:
            notif = &rt->line_out_notify;
            name = "lineout-detect";
            irq = lineout_detect_irq;
            break;
      default:
            return -EINVAL;
      }

      if (irq == NO_IRQ)
            return -ENODEV;

      mutex_lock(&notif->mutex);

      old = notif->notify;

      if (!old && !notify) {
            err = 0;
            goto out_unlock;
      }

      if (old && notify) {
            if (old == notify && notif->data == data)
                  err = 0;
            goto out_unlock;
      }

      if (old && !notify)
            free_irq(irq, notif);

      if (!old && notify) {
            err = request_irq(irq, ftr_handle_notify_irq, 0, name, notif);
            if (err)
                  goto out_unlock;
      }

      notif->notify = notify;
      notif->data = data;

      err = 0;
 out_unlock:
      mutex_unlock(&notif->mutex);
      return err;
}

static int ftr_get_detect(struct gpio_runtime *rt,
                    enum notify_type type)
{
      int gpio, ret, active;

      switch (type) {
      case AOA_NOTIFY_HEADPHONE:
            gpio = headphone_detect_gpio;
            active = headphone_detect_gpio_activestate;
            break;
      case AOA_NOTIFY_LINE_IN:
            gpio = linein_detect_gpio;
            active = linein_detect_gpio_activestate;
            break;
      case AOA_NOTIFY_LINE_OUT:
            gpio = lineout_detect_gpio;
            active = lineout_detect_gpio_activestate;
            break;
      default:
            return -EINVAL;
      }

      if (gpio == -1)
            return -ENODEV;

      ret = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, gpio, 0);
      if (ret < 0)
            return ret;
      return ((ret >> 1) & 1) == active;
}

static struct gpio_methods methods = {
      .init             = ftr_gpio_init,
      .exit             = ftr_gpio_exit,
      .all_amps_off           = ftr_gpio_all_amps_off,
      .all_amps_restore = ftr_gpio_all_amps_restore,
      .set_headphone          = ftr_gpio_set_headphone,
      .set_speakers           = ftr_gpio_set_amp,
      .set_lineout            = ftr_gpio_set_lineout,
      .set_hw_reset           = ftr_gpio_set_hw_reset,
      .get_headphone          = ftr_gpio_get_headphone,
      .get_speakers           = ftr_gpio_get_amp,
      .get_lineout            = ftr_gpio_get_lineout,
      .set_notify       = ftr_set_notify,
      .get_detect       = ftr_get_detect,
};

struct gpio_methods *ftr_gpio_methods = &methods;
EXPORT_SYMBOL_GPL(ftr_gpio_methods);

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