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/*
* 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 <sound/driver.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/i2c-dev.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;
#define I2C_DRIVERID_KEYWEST 0xFEBA
static int keywest_attach_adapter(struct i2c_adapter *adapter);
static int keywest_detach_client(struct i2c_client *client);
struct i2c_driver keywest_driver = {
.name = "PMac Keywest Audio",
.id = I2C_DRIVERID_KEYWEST,
.attach_adapter = &keywest_attach_adapter,
.detach_client = &keywest_detach_client,
};
#ifndef i2c_device_name
#define i2c_device_name(x) ((x)->name)
#endif
static int keywest_attach_adapter(struct i2c_adapter *adapter)
{
int err;
struct i2c_client *new_client;
if (! keywest_ctx)
return -EINVAL;
if (strncmp(i2c_device_name(adapter), "mac-io", 6))
return 0; /* ignored */
new_client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
if (! new_client)
return -ENOMEM;
memset(new_client, 0, sizeof(*new_client));
new_client->addr = keywest_ctx->addr;
i2c_set_clientdata(new_client, keywest_ctx);
new_client->adapter = adapter;
new_client->driver = &keywest_driver;
new_client->flags = 0;
strcpy(i2c_device_name(new_client), keywest_ctx->name);
keywest_ctx->client = new_client;
/* Tell the i2c layer a new client has arrived */
if (i2c_attach_client(new_client)) {
snd_printk(KERN_ERR "tumbler: cannot attach i2c client\n");
err = -ENODEV;
goto __err;
}
return 0;
__err:
kfree(new_client);
keywest_ctx->client = NULL;
return err;
}
static int keywest_detach_client(struct i2c_client *client)
{
if (! keywest_ctx)
return 0;
if (client == keywest_ctx->client)
keywest_ctx->client = NULL;
i2c_detach_client(client);
kfree(client);
return 0;
}
/* 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 __init snd_pmac_tumbler_post_init(void)
{
int err;
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 __init 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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