[net-next-2.6.git] / sound / ppc / 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_attach_adapter(struct i2c_adapter *adapter);
static int keywest_detach_client(struct i2c_client *client);

struct i2c_driver keywest_driver = {  
	.driver = {
		.name = "PMac Keywest Audio",
	},
	.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 = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
	if (! new_client)
		return -ENOMEM;

	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 (!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 __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;
}
Commit	Line	Data
1da177e4 LT	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
1da177e4 LT	22	#include <linux/init.h>
	23	#include <linux/i2c.h>
	24	#include <linux/delay.h>
1da177e4 LT	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	*/
65b29f50	33	static struct pmac_keywest *keywest_ctx;
1da177e4 LT	34
1da177e4 LT	35
1da177e4 LT	36	static int keywest_attach_adapter(struct i2c_adapter *adapter);
	37	static int keywest_detach_client(struct i2c_client *client);
	38
	39	struct i2c_driver keywest_driver = {
e100fe10	40	.driver = {
e100fe10 LR	41	.name = "PMac Keywest Audio",
e100fe10 LR	42	},
1da177e4 LT	43	.attach_adapter = &keywest_attach_adapter,
	44	.detach_client = &keywest_detach_client,
	45	};
	46
	47
	48	#ifndef i2c_device_name
	49	#define i2c_device_name(x) ((x)->name)
	50	#endif
	51
	52	static int keywest_attach_adapter(struct i2c_adapter *adapter)
	53	{
	54	int err;
	55	struct i2c_client *new_client;
	56
	57	if (! keywest_ctx)
	58	return -EINVAL;
	59
	60	if (strncmp(i2c_device_name(adapter), "mac-io", 6))
	61	return 0; /* ignored */
	62
59feddb2	63	new_client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
1da177e4 LT	64	if (! new_client)
	65	return -ENOMEM;
	66
1da177e4 LT	67	new_client->addr = keywest_ctx->addr;
	68	i2c_set_clientdata(new_client, keywest_ctx);
	69	new_client->adapter = adapter;
	70	new_client->driver = &keywest_driver;
	71	new_client->flags = 0;
	72
	73	strcpy(i2c_device_name(new_client), keywest_ctx->name);
	74	keywest_ctx->client = new_client;
	75
	76	/* Tell the i2c layer a new client has arrived */
	77	if (i2c_attach_client(new_client)) {
	78	snd_printk(KERN_ERR "tumbler: cannot attach i2c client\n");
	79	err = -ENODEV;
	80	goto __err;
	81	}
	82
	83	return 0;
	84
	85	__err:
	86	kfree(new_client);
	87	keywest_ctx->client = NULL;
	88	return err;
	89	}
	90
	91	static int keywest_detach_client(struct i2c_client *client)
	92	{
	93	if (! keywest_ctx)
	94	return 0;
	95	if (client == keywest_ctx->client)
	96	keywest_ctx->client = NULL;
	97
	98	i2c_detach_client(client);
	99	kfree(client);
	100	return 0;
	101	}
	102
	103	/* exported */
65b29f50	104	void snd_pmac_keywest_cleanup(struct pmac_keywest *i2c)
1da177e4 LT	105	{
	106	if (keywest_ctx && keywest_ctx == i2c) {
	107	i2c_del_driver(&keywest_driver);
	108	keywest_ctx = NULL;
	109	}
	110	}
	111
	112	int __init snd_pmac_tumbler_post_init(void)
	113	{
	114	int err;
	115
783eaf46 TI	116	if (!keywest_ctx \|\| !keywest_ctx->client)
	117	return -ENXIO;
	118
1da177e4 LT	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 */
65b29f50	127	int __init snd_pmac_keywest_init(struct pmac_keywest *i2c)
1da177e4 LT	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	}