linux/sound/ppc/keywest.c
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   1/*
   2 * common keywest i2c layer
   3 *
   4 * Copyright (c) by Takashi Iwai <tiwai@suse.de>
   5 *
   6 *   This program is free software; you can redistribute it and/or modify
   7 *   it under the terms of the GNU General Public License as published by
   8 *   the Free Software Foundation; either version 2 of the License, or
   9 *   (at your option) any later version.
  10 *
  11 *   This program is distributed in the hope that it will be useful,
  12 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 *   GNU General Public License for more details.
  15 *
  16 *   You should have received a copy of the GNU General Public License
  17 *   along with this program; if not, write to the Free Software
  18 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19 */
  20
  21
  22#include <linux/init.h>
  23#include <linux/i2c.h>
  24#include <linux/delay.h>
  25#include <linux/slab.h>
  26#include <sound/core.h>
  27#include "pmac.h"
  28
  29/*
  30 * we have to keep a static variable here since i2c attach_adapter
  31 * callback cannot pass a private data.
  32 */
  33static struct pmac_keywest *keywest_ctx;
  34
  35
  36#ifndef i2c_device_name
  37#define i2c_device_name(x)      ((x)->name)
  38#endif
  39
  40static int keywest_probe(struct i2c_client *client,
  41                         const struct i2c_device_id *id)
  42{
  43        i2c_set_clientdata(client, keywest_ctx);
  44        return 0;
  45}
  46
  47/*
  48 * This is kind of a hack, best would be to turn powermac to fixed i2c
  49 * bus numbers and declare the sound device as part of platform
  50 * initialization
  51 */
  52static int keywest_attach_adapter(struct i2c_adapter *adapter)
  53{
  54        struct i2c_board_info info;
  55
  56        if (! keywest_ctx)
  57                return -EINVAL;
  58
  59        if (strncmp(i2c_device_name(adapter), "mac-io", 6))
  60                return 0; /* ignored */
  61
  62        memset(&info, 0, sizeof(struct i2c_board_info));
  63        strlcpy(info.type, "keywest", I2C_NAME_SIZE);
  64        info.addr = keywest_ctx->addr;
  65        keywest_ctx->client = i2c_new_device(adapter, &info);
  66        
  67        /*
  68         * Let i2c-core delete that device on driver removal.
  69         * This is safe because i2c-core holds the core_lock mutex for us.
  70         */
  71        list_add_tail(&keywest_ctx->client->detected,
  72                      &keywest_ctx->client->driver->clients);
  73        return 0;
  74}
  75
  76static int keywest_remove(struct i2c_client *client)
  77{
  78        i2c_set_clientdata(client, NULL);
  79        if (! keywest_ctx)
  80                return 0;
  81        if (client == keywest_ctx->client)
  82                keywest_ctx->client = NULL;
  83
  84        return 0;
  85}
  86
  87
  88static const struct i2c_device_id keywest_i2c_id[] = {
  89        { "keywest", 0 },
  90        { }
  91};
  92
  93struct i2c_driver keywest_driver = {
  94        .driver = {
  95                .name = "PMac Keywest Audio",
  96        },
  97        .attach_adapter = keywest_attach_adapter,
  98        .probe = keywest_probe,
  99        .remove = keywest_remove,
 100        .id_table = keywest_i2c_id,
 101};
 102
 103/* exported */
 104void snd_pmac_keywest_cleanup(struct pmac_keywest *i2c)
 105{
 106        if (keywest_ctx && keywest_ctx == i2c) {
 107                i2c_del_driver(&keywest_driver);
 108                keywest_ctx = NULL;
 109        }
 110}
 111
 112int __init snd_pmac_tumbler_post_init(void)
 113{
 114        int err;
 115        
 116        if (!keywest_ctx || !keywest_ctx->client)
 117                return -ENXIO;
 118
 119        if ((err = keywest_ctx->init_client(keywest_ctx)) < 0) {
 120                snd_printk(KERN_ERR "tumbler: %i :cannot initialize the MCS\n", err);
 121                return err;
 122        }
 123        return 0;
 124}
 125
 126/* exported */
 127int __init snd_pmac_keywest_init(struct pmac_keywest *i2c)
 128{
 129        int err;
 130
 131        if (keywest_ctx)
 132                return -EBUSY;
 133
 134        keywest_ctx = i2c;
 135
 136        if ((err = i2c_add_driver(&keywest_driver))) {
 137                snd_printk(KERN_ERR "cannot register keywest i2c driver\n");
 138                return err;
 139        }
 140        return 0;
 141}
 142