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keywest.c

/*
 * common keywest i2c layer
 *
 * Copyright (c) by Takashi Iwai <tiwai@suse.de>
 *
 *   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 <linux/init.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <sound/core.h>
#include "pmac.h"

/*
 * we have to keep a static variable here since i2c attach_adapter
 * callback cannot pass a private data.
 */
static struct pmac_keywest *keywest_ctx;


static int keywest_probe(struct i2c_client *client,
                   const struct i2c_device_id *id)
{
      i2c_set_clientdata(client, keywest_ctx);
      return 0;
}

/*
 * This is kind of a hack, best would be to turn powermac to fixed i2c
 * bus numbers and declare the sound device as part of platform
 * initialization
 */
static int keywest_attach_adapter(struct i2c_adapter *adapter)
{
      struct i2c_board_info info;

      if (! keywest_ctx)
            return -EINVAL;

      if (strncmp(adapter->name, "mac-io", 6))
            return 0; /* ignored */

      memset(&info, 0, sizeof(struct i2c_board_info));
      strlcpy(info.type, "keywest", I2C_NAME_SIZE);
      info.addr = keywest_ctx->addr;
      keywest_ctx->client = i2c_new_device(adapter, &info);
      
      /*
       * Let i2c-core delete that device on driver removal.
       * This is safe because i2c-core holds the core_lock mutex for us.
       */
      list_add_tail(&keywest_ctx->client->detected,
                  &keywest_ctx->client->driver->clients);
      return 0;
}

static int keywest_remove(struct i2c_client *client)
{
      i2c_set_clientdata(client, NULL);
      if (! keywest_ctx)
            return 0;
      if (client == keywest_ctx->client)
            keywest_ctx->client = NULL;

      return 0;
}


static const struct i2c_device_id keywest_i2c_id[] = {
      { "keywest", 0 },
      { }
};

struct i2c_driver keywest_driver = {
      .driver = {
            .name = "PMac Keywest Audio",
      },
      .attach_adapter = keywest_attach_adapter,
      .probe = keywest_probe,
      .remove = keywest_remove,
      .id_table = keywest_i2c_id,
};

/* exported */
void snd_pmac_keywest_cleanup(struct pmac_keywest *i2c)
{
      if (keywest_ctx && keywest_ctx == i2c) {
            i2c_del_driver(&keywest_driver);
            keywest_ctx = NULL;
      }
}

int __devinit snd_pmac_tumbler_post_init(void)
{
      int err;
      
      if (!keywest_ctx || !keywest_ctx->client)
            return -ENXIO;

      if ((err = keywest_ctx->init_client(keywest_ctx)) < 0) {
            snd_printk(KERN_ERR "tumbler: %i :cannot initialize the MCS\n", err);
            return err;
      }
      return 0;
}

/* exported */
int __devinit snd_pmac_keywest_init(struct pmac_keywest *i2c)
{
      int err;

      if (keywest_ctx)
            return -EBUSY;

      keywest_ctx = i2c;

      if ((err = i2c_add_driver(&keywest_driver))) {
            snd_printk(KERN_ERR "cannot register keywest i2c driver\n");
            return err;
      }
      return 0;
}

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