blob: 835fa19ed461864018fb152aa3c41eb57261cb4b [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/init.h>
23#include <linux/i2c.h>
24#include <linux/delay.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#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 */
Takashi Iwai65b29f52005-11-17 15:09:46 +010033static struct pmac_keywest *keywest_ctx;
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
35
Jean Delvare5de41552009-04-20 22:56:59 +020036static int keywest_probe(struct i2c_client *client,
37 const struct i2c_device_id *id)
38{
39 i2c_set_clientdata(client, keywest_ctx);
40 return 0;
41}
42
43/*
44 * This is kind of a hack, best would be to turn powermac to fixed i2c
45 * bus numbers and declare the sound device as part of platform
46 * initialization
47 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070048static int keywest_attach_adapter(struct i2c_adapter *adapter)
49{
Jean Delvare5de41552009-04-20 22:56:59 +020050 struct i2c_board_info info;
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
52 if (! keywest_ctx)
53 return -EINVAL;
54
Jean Delvare903dba12009-05-14 14:37:21 +020055 if (strncmp(adapter->name, "mac-io", 6))
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 return 0; /* ignored */
57
Jean Delvare5de41552009-04-20 22:56:59 +020058 memset(&info, 0, sizeof(struct i2c_board_info));
59 strlcpy(info.type, "keywest", I2C_NAME_SIZE);
60 info.addr = keywest_ctx->addr;
61 keywest_ctx->client = i2c_new_device(adapter, &info);
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
Jean Delvare5de41552009-04-20 22:56:59 +020063 /*
64 * Let i2c-core delete that device on driver removal.
65 * This is safe because i2c-core holds the core_lock mutex for us.
66 */
67 list_add_tail(&keywest_ctx->client->detected,
68 &keywest_ctx->client->driver->clients);
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070070}
71
Jean Delvare5de41552009-04-20 22:56:59 +020072static int keywest_remove(struct i2c_client *client)
Linus Torvalds1da177e2005-04-16 15:20:36 -070073{
Jean Delvare5de41552009-04-20 22:56:59 +020074 i2c_set_clientdata(client, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 if (! keywest_ctx)
76 return 0;
77 if (client == keywest_ctx->client)
78 keywest_ctx->client = NULL;
79
Linus Torvalds1da177e2005-04-16 15:20:36 -070080 return 0;
81}
82
Jean Delvare5de41552009-04-20 22:56:59 +020083
84static const struct i2c_device_id keywest_i2c_id[] = {
85 { "keywest", 0 },
86 { }
87};
88
89struct i2c_driver keywest_driver = {
90 .driver = {
91 .name = "PMac Keywest Audio",
92 },
93 .attach_adapter = keywest_attach_adapter,
94 .probe = keywest_probe,
95 .remove = keywest_remove,
96 .id_table = keywest_i2c_id,
97};
98
Linus Torvalds1da177e2005-04-16 15:20:36 -070099/* exported */
Takashi Iwai65b29f52005-11-17 15:09:46 +0100100void snd_pmac_keywest_cleanup(struct pmac_keywest *i2c)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101{
102 if (keywest_ctx && keywest_ctx == i2c) {
103 i2c_del_driver(&keywest_driver);
104 keywest_ctx = NULL;
105 }
106}
107
Stephen Rothwell5c9b6e92009-06-03 15:35:19 +1000108int __devinit snd_pmac_tumbler_post_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109{
110 int err;
111
Takashi Iwai783eaf42006-09-17 22:00:51 +0200112 if (!keywest_ctx || !keywest_ctx->client)
113 return -ENXIO;
114
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 if ((err = keywest_ctx->init_client(keywest_ctx)) < 0) {
116 snd_printk(KERN_ERR "tumbler: %i :cannot initialize the MCS\n", err);
117 return err;
118 }
119 return 0;
120}
121
122/* exported */
Stephen Rothwell5c9b6e92009-06-03 15:35:19 +1000123int __devinit snd_pmac_keywest_init(struct pmac_keywest *i2c)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124{
125 int err;
126
127 if (keywest_ctx)
128 return -EBUSY;
129
130 keywest_ctx = i2c;
131
132 if ((err = i2c_add_driver(&keywest_driver))) {
133 snd_printk(KERN_ERR "cannot register keywest i2c driver\n");
134 return err;
135 }
136 return 0;
137}