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 <linux/slab.h>
26 #include <sound/core.h>
30 * we have to keep a static variable here since i2c attach_adapter
31 * callback cannot pass a private data.
33 static struct pmac_keywest *keywest_ctx;
36 static int keywest_probe(struct i2c_client *client,
37 const struct i2c_device_id *id)
39 i2c_set_clientdata(client, keywest_ctx);
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
48 static int keywest_attach_adapter(struct i2c_adapter *adapter)
50 struct i2c_board_info info;
55 if (strncmp(adapter->name, "mac-io", 6))
56 return 0; /* ignored */
58 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);
64 * Let i2c-core delete that device on driver removal.
65 * This is safe because i2c-core holds the core_lock mutex for us.
67 list_add_tail(&keywest_ctx->client->detected,
68 &keywest_ctx->client->driver->clients);
72 static int keywest_remove(struct i2c_client *client)
74 i2c_set_clientdata(client, NULL);
77 if (client == keywest_ctx->client)
78 keywest_ctx->client = NULL;
84 static const struct i2c_device_id keywest_i2c_id[] = {
89 struct i2c_driver keywest_driver = {
91 .name = "PMac Keywest Audio",
93 .attach_adapter = keywest_attach_adapter,
94 .probe = keywest_probe,
95 .remove = keywest_remove,
96 .id_table = keywest_i2c_id,
100 void snd_pmac_keywest_cleanup(struct pmac_keywest *i2c)
102 if (keywest_ctx && keywest_ctx == i2c) {
103 i2c_del_driver(&keywest_driver);
108 int __init snd_pmac_tumbler_post_init(void)
112 if (!keywest_ctx || !keywest_ctx->client)
115 if ((err = keywest_ctx->init_client(keywest_ctx)) < 0) {
116 snd_printk(KERN_ERR "tumbler: %i :cannot initialize the MCS\n", err);
123 int __init snd_pmac_keywest_init(struct pmac_keywest *i2c)
132 if ((err = i2c_add_driver(&keywest_driver))) {
133 snd_printk(KERN_ERR "cannot register keywest i2c driver\n");