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 <sound/driver.h>
23 #include <linux/init.h>
24 #include <linux/i2c.h>
25 #include <linux/delay.h>
26 #include <linux/i2c-dev.h>
27 #include <linux/slab.h>
28 #include <sound/core.h>
32 * we have to keep a static variable here since i2c attach_adapter
33 * callback cannot pass a private data.
35 static struct pmac_keywest *keywest_ctx;
38 #define I2C_DRIVERID_KEYWEST 0xFEBA
40 static int keywest_attach_adapter(struct i2c_adapter *adapter);
41 static int keywest_detach_client(struct i2c_client *client);
43 struct i2c_driver keywest_driver = {
45 .name = "PMac Keywest Audio",
47 .id = I2C_DRIVERID_KEYWEST,
48 .attach_adapter = &keywest_attach_adapter,
49 .detach_client = &keywest_detach_client,
53 #ifndef i2c_device_name
54 #define i2c_device_name(x) ((x)->name)
57 static int keywest_attach_adapter(struct i2c_adapter *adapter)
60 struct i2c_client *new_client;
65 if (strncmp(i2c_device_name(adapter), "mac-io", 6))
66 return 0; /* ignored */
68 new_client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
72 memset(new_client, 0, sizeof(*new_client));
73 new_client->addr = keywest_ctx->addr;
74 i2c_set_clientdata(new_client, keywest_ctx);
75 new_client->adapter = adapter;
76 new_client->driver = &keywest_driver;
77 new_client->flags = 0;
79 strcpy(i2c_device_name(new_client), keywest_ctx->name);
80 keywest_ctx->client = new_client;
82 /* Tell the i2c layer a new client has arrived */
83 if (i2c_attach_client(new_client)) {
84 snd_printk(KERN_ERR "tumbler: cannot attach i2c client\n");
93 keywest_ctx->client = NULL;
97 static int keywest_detach_client(struct i2c_client *client)
101 if (client == keywest_ctx->client)
102 keywest_ctx->client = NULL;
104 i2c_detach_client(client);
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 __init snd_pmac_tumbler_post_init(void)
122 if ((err = keywest_ctx->init_client(keywest_ctx)) < 0) {
123 snd_printk(KERN_ERR "tumbler: %i :cannot initialize the MCS\n", err);
130 int __init snd_pmac_keywest_init(struct pmac_keywest *i2c)
139 if ((err = i2c_add_driver(&keywest_driver))) {
140 snd_printk(KERN_ERR "cannot register keywest i2c driver\n");