2
* common keywest i2c layer
4
* Copyright (c) by Takashi Iwai <tiwai@suse.de>
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.
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.
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
22
#include <linux/init.h>
23
#include <linux/i2c.h>
24
#include <linux/delay.h>
25
#include <sound/core.h>
29
* we have to keep a static variable here since i2c attach_adapter
30
* callback cannot pass a private data.
32
static struct pmac_keywest *keywest_ctx;
35
static int keywest_probe(struct i2c_client *client,
36
const struct i2c_device_id *id)
38
i2c_set_clientdata(client, keywest_ctx);
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
47
static int keywest_attach_adapter(struct i2c_adapter *adapter)
49
struct i2c_board_info info;
54
if (strncmp(adapter->name, "mac-io", 6))
55
return 0; /* ignored */
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);
61
if (!keywest_ctx->client)
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.
68
if (!keywest_ctx->client->driver) {
69
i2c_unregister_device(keywest_ctx->client);
70
keywest_ctx->client = NULL;
75
* Let i2c-core delete that device on driver removal.
76
* This is safe because i2c-core holds the core_lock mutex for us.
78
list_add_tail(&keywest_ctx->client->detected,
79
&keywest_ctx->client->driver->clients);
83
static int keywest_remove(struct i2c_client *client)
87
if (client == keywest_ctx->client)
88
keywest_ctx->client = NULL;
94
static const struct i2c_device_id keywest_i2c_id[] = {
99
static struct i2c_driver keywest_driver = {
101
.name = "PMac Keywest Audio",
103
.attach_adapter = keywest_attach_adapter,
104
.probe = keywest_probe,
105
.remove = keywest_remove,
106
.id_table = keywest_i2c_id,
110
void snd_pmac_keywest_cleanup(struct pmac_keywest *i2c)
112
if (keywest_ctx && keywest_ctx == i2c) {
113
i2c_del_driver(&keywest_driver);
118
int __devinit snd_pmac_tumbler_post_init(void)
122
if (!keywest_ctx || !keywest_ctx->client)
125
if ((err = keywest_ctx->init_client(keywest_ctx)) < 0) {
126
snd_printk(KERN_ERR "tumbler: %i :cannot initialize the MCS\n", err);
133
int __devinit snd_pmac_keywest_init(struct pmac_keywest *i2c)
142
if ((err = i2c_add_driver(&keywest_driver))) {
143
snd_printk(KERN_ERR "cannot register keywest i2c driver\n");