[deliverable/linux.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;


#ifndef i2c_device_name
#define i2c_device_name(x)	((x)->name)
#endif

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(i2c_device_name(adapter), "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 __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	#ifndef i2c_device_name
	37	#define i2c_device_name(x) ((x)->name)
	38	#endif
	39
5de4155b JD	40	static 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	*/
1da177e4 LT	52	static int keywest_attach_adapter(struct i2c_adapter *adapter)
1da177e4 LT	53	{
5de4155b	54	struct i2c_board_info info;
1da177e4 LT	55
	56	if (! keywest_ctx)
	57	return -EINVAL;
	58
	59	if (strncmp(i2c_device_name(adapter), "mac-io", 6))
	60	return 0; /* ignored */
	61
5de4155b JD	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);
1da177e4	66
5de4155b JD	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);
1da177e4	73	return 0;
1da177e4 LT	74	}
1da177e4 LT	75
5de4155b	76	static int keywest_remove(struct i2c_client *client)
1da177e4	77	{
5de4155b	78	i2c_set_clientdata(client, NULL);
1da177e4 LT	79	if (! keywest_ctx)
	80	return 0;
	81	if (client == keywest_ctx->client)
	82	keywest_ctx->client = NULL;
	83
1da177e4 LT	84	return 0;
	85	}
	86
5de4155b JD	87
	88	static const struct i2c_device_id keywest_i2c_id[] = {
	89	{ "keywest", 0 },
	90	{ }
	91	};
	92
	93	struct 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
1da177e4	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	}