[GitHub/mt8127/android_kernel_alcatel_ttab.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 <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);
	if (!keywest_ctx->client)
		return -ENODEV;
	/*
	 * We know the driver is already loaded, so the device should be
	 * already bound. If not it means binding failed, and then there
	 * is no point in keeping the device instantiated.
	 */
	if (!keywest_ctx->client->driver) {
		i2c_unregister_device(keywest_ctx->client);
		keywest_ctx->client = NULL;
		return -ENODEV;
	}
	
	/*
	 * 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)
{
	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 },
	{ }
};

static 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 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 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 <sound/core.h>
	26	#include "pmac.h"
	27
	28	/*
	29	* we have to keep a static variable here since i2c attach_adapter
	30	* callback cannot pass a private data.
	31	*/
65b29f50	32	static struct pmac_keywest *keywest_ctx;
1da177e4 LT	33
1da177e4 LT	34
5de4155b JD	35	static int keywest_probe(struct i2c_client *client,
	36	const struct i2c_device_id *id)
	37	{
	38	i2c_set_clientdata(client, keywest_ctx);
	39	return 0;
	40	}
	41
	42	/*
	43	* This is kind of a hack, best would be to turn powermac to fixed i2c
	44	* bus numbers and declare the sound device as part of platform
	45	* initialization
	46	*/
1da177e4 LT	47	static int keywest_attach_adapter(struct i2c_adapter *adapter)
1da177e4 LT	48	{
5de4155b	49	struct i2c_board_info info;
1da177e4 LT	50
	51	if (! keywest_ctx)
	52	return -EINVAL;
	53
903dba1e	54	if (strncmp(adapter->name, "mac-io", 6))
1da177e4 LT	55	return 0; /* ignored */
1da177e4 LT	56
5de4155b JD	57	memset(&info, 0, sizeof(struct i2c_board_info));
	58	strlcpy(info.type, "keywest", I2C_NAME_SIZE);
	59	info.addr = keywest_ctx->addr;
	60	keywest_ctx->client = i2c_new_device(adapter, &info);
18c40784 TI	61	if (!keywest_ctx->client)
	62	return -ENODEV;
	63	/*
	64	* We know the driver is already loaded, so the device should be
	65	* already bound. If not it means binding failed, and then there
	66	* is no point in keeping the device instantiated.
	67	*/
	68	if (!keywest_ctx->client->driver) {
	69	i2c_unregister_device(keywest_ctx->client);
	70	keywest_ctx->client = NULL;
	71	return -ENODEV;
	72	}
1da177e4	73
5de4155b JD	74	/*
	75	* Let i2c-core delete that device on driver removal.
	76	* This is safe because i2c-core holds the core_lock mutex for us.
	77	*/
	78	list_add_tail(&keywest_ctx->client->detected,
	79	&keywest_ctx->client->driver->clients);
1da177e4	80	return 0;
1da177e4 LT	81	}
1da177e4 LT	82
5de4155b	83	static int keywest_remove(struct i2c_client *client)
1da177e4 LT	84	{
	85	if (! keywest_ctx)
	86	return 0;
	87	if (client == keywest_ctx->client)
	88	keywest_ctx->client = NULL;
	89
1da177e4 LT	90	return 0;
	91	}
	92
5de4155b JD	93
	94	static const struct i2c_device_id keywest_i2c_id[] = {
	95	{ "keywest", 0 },
	96	{ }
	97	};
	98
a656cbf0	99	static struct i2c_driver keywest_driver = {
5de4155b JD	100	.driver = {
	101	.name = "PMac Keywest Audio",
	102	},
	103	.attach_adapter = keywest_attach_adapter,
	104	.probe = keywest_probe,
	105	.remove = keywest_remove,
	106	.id_table = keywest_i2c_id,
	107	};
	108
1da177e4	109	/* exported */
65b29f50	110	void snd_pmac_keywest_cleanup(struct pmac_keywest *i2c)
1da177e4 LT	111	{
	112	if (keywest_ctx && keywest_ctx == i2c) {
	113	i2c_del_driver(&keywest_driver);
	114	keywest_ctx = NULL;
	115	}
	116	}
	117
15afafc2	118	int snd_pmac_tumbler_post_init(void)
1da177e4 LT	119	{
	120	int err;
	121
783eaf46 TI	122	if (!keywest_ctx \|\| !keywest_ctx->client)
	123	return -ENXIO;
	124
1da177e4 LT	125	if ((err = keywest_ctx->init_client(keywest_ctx)) < 0) {
	126	snd_printk(KERN_ERR "tumbler: %i :cannot initialize the MCS\n", err);
	127	return err;
	128	}
	129	return 0;
	130	}
	131
	132	/* exported */
15afafc2	133	int snd_pmac_keywest_init(struct pmac_keywest *i2c)
1da177e4 LT	134	{
	135	int err;
	136
	137	if (keywest_ctx)
	138	return -EBUSY;
	139
	140	keywest_ctx = i2c;
	141
	142	if ((err = i2c_add_driver(&keywest_driver))) {
	143	snd_printk(KERN_ERR "cannot register keywest i2c driver\n");
	144	return err;
	145	}
	146	return 0;
	147	}