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toonie.c

/*
 * Mac Mini "toonie" mixer control
 *
 * Copyright (c) 2005 by Benjamin Herrenschmidt <benh@kernel.crashing.org>
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */

#include <sound/driver.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/i2c-dev.h>
#include <linux/kmod.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <sound/core.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/machdep.h>
#include <asm/pmac_feature.h>
#include "pmac.h"

#undef DEBUG

#ifdef DEBUG
#define DBG(fmt...) printk(fmt)
#else
#define DBG(fmt...)
#endif

struct pmac_gpio {
      unsigned int addr;
      u8 active_val;
      u8 inactive_val;
      u8 active_state;
};

struct pmac_toonie
{
      struct pmac_gpio  hp_detect_gpio;
      struct pmac_gpio  hp_mute_gpio;
      struct pmac_gpio  amp_mute_gpio;
      int               hp_detect_irq;
      int               auto_mute_notify;
      struct work_struct      detect_work;
};


/*
 * gpio access
 */
#define do_gpio_write(gp, val) \
      pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, (gp)->addr, val)
#define do_gpio_read(gp) \
      pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, (gp)->addr, 0)
#define tumbler_gpio_free(gp) /* NOP */

static void write_audio_gpio(struct pmac_gpio *gp, int active)
{
      if (! gp->addr)
            return;
      active = active ? gp->active_val : gp->inactive_val;
      do_gpio_write(gp, active);
      DBG("(I) gpio %x write %d\n", gp->addr, active);
}

static int check_audio_gpio(struct pmac_gpio *gp)
{
      int ret;

      if (! gp->addr)
            return 0;

      ret = do_gpio_read(gp);

      return (ret & 0xd) == (gp->active_val & 0xd);
}

static int read_audio_gpio(struct pmac_gpio *gp)
{
      int ret;
      if (! gp->addr)
            return 0;
      ret = ((do_gpio_read(gp) & 0x02) !=0);
      return ret == gp->active_state;
}


enum { TOONIE_MUTE_HP, TOONIE_MUTE_AMP };

static int toonie_get_mute_switch(snd_kcontrol_t *kcontrol,
                          snd_ctl_elem_value_t *ucontrol)
{
      pmac_t *chip = snd_kcontrol_chip(kcontrol);
      struct pmac_toonie *mix = chip->mixer_data;
      struct pmac_gpio *gp;

      if (mix == NULL)
            return -ENODEV;
      switch(kcontrol->private_value) {
      case TOONIE_MUTE_HP:
            gp = &mix->hp_mute_gpio;
            break;
      case TOONIE_MUTE_AMP:
            gp = &mix->amp_mute_gpio;
            break;
      default:
            return -EINVAL;;
      }
      ucontrol->value.integer.value[0] = !check_audio_gpio(gp);
      return 0;
}

static int toonie_put_mute_switch(snd_kcontrol_t *kcontrol,
                           snd_ctl_elem_value_t *ucontrol)
{
      pmac_t *chip = snd_kcontrol_chip(kcontrol);
      struct pmac_toonie *mix = chip->mixer_data;
      struct pmac_gpio *gp;
      int val;

      if (chip->update_automute && chip->auto_mute)
            return 0; /* don't touch in the auto-mute mode */

      if (mix == NULL)
            return -ENODEV;

      switch(kcontrol->private_value) {
      case TOONIE_MUTE_HP:
            gp = &mix->hp_mute_gpio;
            break;
      case TOONIE_MUTE_AMP:
            gp = &mix->amp_mute_gpio;
            break;
      default:
            return -EINVAL;;
      }
      val = ! check_audio_gpio(gp);
      if (val != ucontrol->value.integer.value[0]) {
            write_audio_gpio(gp, ! ucontrol->value.integer.value[0]);
            return 1;
      }
      return 0;
}

static snd_kcontrol_new_t toonie_hp_sw __initdata = {
      .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
      .name = "Headphone Playback Switch",
      .info = snd_pmac_boolean_mono_info,
      .get = toonie_get_mute_switch,
      .put = toonie_put_mute_switch,
      .private_value = TOONIE_MUTE_HP,
};
static snd_kcontrol_new_t toonie_speaker_sw __initdata = {
      .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
      .name = "PC Speaker Playback Switch",
      .info = snd_pmac_boolean_mono_info,
      .get = toonie_get_mute_switch,
      .put = toonie_put_mute_switch,
      .private_value = TOONIE_MUTE_AMP,
};

/*
 * auto-mute stuffs
 */
static int toonie_detect_headphone(pmac_t *chip)
{
      struct pmac_toonie *mix = chip->mixer_data;
      int detect = 0;

      if (mix->hp_detect_gpio.addr)
            detect |= read_audio_gpio(&mix->hp_detect_gpio);
      return detect;
}

static void toonie_check_mute(pmac_t *chip, struct pmac_gpio *gp, int val,
                        int do_notify, snd_kcontrol_t *sw)
{
      if (check_audio_gpio(gp) != val) {
            write_audio_gpio(gp, val);
            if (do_notify)
                  snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
                               &sw->id);
      }
}

static void toonie_detect_handler(void *self)
{
      pmac_t *chip = (pmac_t*) self;
      struct pmac_toonie *mix;
      int headphone;

      if (!chip)
            return;

      mix = chip->mixer_data;
      snd_assert(mix, return);

      headphone = toonie_detect_headphone(chip);

      DBG("headphone: %d, lineout: %d\n", headphone, lineout);

      if (headphone) {
            /* unmute headphone/lineout & mute speaker */
            toonie_check_mute(chip, &mix->hp_mute_gpio, 0,
                          mix->auto_mute_notify, chip->master_sw_ctl);
            toonie_check_mute(chip, &mix->amp_mute_gpio, 1,
                          mix->auto_mute_notify, chip->speaker_sw_ctl);
      } else {
            /* unmute speaker, mute others */
            toonie_check_mute(chip, &mix->amp_mute_gpio, 0,
                          mix->auto_mute_notify, chip->speaker_sw_ctl);
            toonie_check_mute(chip, &mix->hp_mute_gpio, 1,
                          mix->auto_mute_notify, chip->master_sw_ctl);
      }
      if (mix->auto_mute_notify) {
            snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
                               &chip->hp_detect_ctl->id);
      }
}

static void toonie_update_automute(pmac_t *chip, int do_notify)
{
      if (chip->auto_mute) {
            struct pmac_toonie *mix;
            mix = chip->mixer_data;
            snd_assert(mix, return);
            mix->auto_mute_notify = do_notify;
            schedule_work(&mix->detect_work);
      }
}

/* interrupt - headphone plug changed */
static irqreturn_t toonie_hp_intr(int irq, void *devid, struct pt_regs *regs)
{
      pmac_t *chip = devid;

      if (chip->update_automute && chip->initialized) {
            chip->update_automute(chip, 1);
            return IRQ_HANDLED;
      }
      return IRQ_NONE;
}

/* look for audio gpio device */
static int find_audio_gpio(const char *name, const char *platform,
                     struct pmac_gpio *gp)
{
      struct device_node *np;
      u32 *base, addr;

      if (! (np = find_devices("gpio")))
            return -ENODEV;

      for (np = np->child; np; np = np->sibling) {
            char *property = get_property(np, "audio-gpio", NULL);
            if (property && strcmp(property, name) == 0)
                  break;
            if (device_is_compatible(np, name))
                  break;
      }
      if (np == NULL)
            return -ENODEV;

      base = (u32 *)get_property(np, "AAPL,address", NULL);
      if (! base) {
            base = (u32 *)get_property(np, "reg", NULL);
            if (!base) {
                  DBG("(E) cannot find address for device %s !\n", name);
                  return -ENODEV;
            }
            addr = *base;
            if (addr < 0x50)
                  addr += 0x50;
      } else
            addr = *base;

      gp->addr = addr & 0x0000ffff;

      /* Try to find the active state, default to 0 ! */
      base = (u32 *)get_property(np, "audio-gpio-active-state", NULL);
      if (base) {
            gp->active_state = *base;
            gp->active_val = (*base) ? 0x5 : 0x4;
            gp->inactive_val = (*base) ? 0x4 : 0x5;
      } else {
            u32 *prop = NULL;
            gp->active_state = 0;
            gp->active_val = 0x4;
            gp->inactive_val = 0x5;
            /* Here are some crude hacks to extract the GPIO polarity and
             * open collector informations out of the do-platform script
             * as we don't yet have an interpreter for these things
             */
            if (platform)
                  prop = (u32 *)get_property(np, platform, NULL);
            if (prop) {
                  if (prop[3] == 0x9 && prop[4] == 0x9) {
                        gp->active_val = 0xd;
                        gp->inactive_val = 0xc;
                  }
                  if (prop[3] == 0x1 && prop[4] == 0x1) {
                        gp->active_val = 0x5;
                        gp->inactive_val = 0x4;
                  }
            }
      }

      DBG("(I) GPIO device %s found, offset: %x, active state: %d !\n",
          name, gp->addr, gp->active_state);

      return (np->n_intrs > 0) ? np->intrs[0].line : 0;
}

static void toonie_cleanup(pmac_t *chip)
{
      struct pmac_toonie *mix = chip->mixer_data;
      if (! mix)
            return;
      if (mix->hp_detect_irq >= 0)
            free_irq(mix->hp_detect_irq, chip);
      kfree(mix);
      chip->mixer_data = NULL;
}

int snd_pmac_toonie_init(pmac_t *chip)
{
      struct pmac_toonie *mix;

      mix = kmalloc(sizeof(*mix), GFP_KERNEL);
      if (! mix)
            return -ENOMEM;

      chip->mixer_data = mix;
      chip->mixer_free = toonie_cleanup;

      find_audio_gpio("headphone-mute", NULL, &mix->hp_mute_gpio);
      find_audio_gpio("amp-mute", NULL, &mix->amp_mute_gpio);
      mix->hp_detect_irq = find_audio_gpio("headphone-detect",
                                   NULL, &mix->hp_detect_gpio);

      strcpy(chip->card->mixername, "PowerMac Toonie");

      chip->master_sw_ctl = snd_ctl_new1(&toonie_hp_sw, chip);
      snd_ctl_add(chip->card, chip->master_sw_ctl);

      chip->speaker_sw_ctl = snd_ctl_new1(&toonie_speaker_sw, chip);
      snd_ctl_add(chip->card, chip->speaker_sw_ctl);

      INIT_WORK(&mix->detect_work, toonie_detect_handler, (void *)chip);

      if (mix->hp_detect_irq >= 0) {
            snd_pmac_add_automute(chip);

            chip->detect_headphone = toonie_detect_headphone;
            chip->update_automute = toonie_update_automute;
            toonie_update_automute(chip, 0);

            if (request_irq(mix->hp_detect_irq, toonie_hp_intr, 0,
                        "Sound Headphone Detection", chip) < 0)
                  mix->hp_detect_irq = -1;
      }

      return 0;
}


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