[ALSA] ASoC S3C24xx machine drivers - lm4857-h missing patch
[linux-2.6.git] / sound / ppc / keywest.c
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
22 #include <sound/driver.h>
23 #include <linux/init.h>
24 #include <linux/i2c.h>
25 #include <linux/delay.h>
26 #include <linux/slab.h>
27 #include <sound/core.h>
28 #include "pmac.h"
29
30 /*
31  * we have to keep a static variable here since i2c attach_adapter
32  * callback cannot pass a private data.
33  */
34 static struct pmac_keywest *keywest_ctx;
35
36
37 #define I2C_DRIVERID_KEYWEST    0xFEBA
38
39 static int keywest_attach_adapter(struct i2c_adapter *adapter);
40 static int keywest_detach_client(struct i2c_client *client);
41
42 struct i2c_driver keywest_driver = {  
43         .driver = {
44                 .name = "PMac Keywest Audio",
45         },
46         .id = I2C_DRIVERID_KEYWEST,
47         .attach_adapter = &keywest_attach_adapter,
48         .detach_client = &keywest_detach_client,
49 };
50
51
52 #ifndef i2c_device_name
53 #define i2c_device_name(x)      ((x)->name)
54 #endif
55
56 static int keywest_attach_adapter(struct i2c_adapter *adapter)
57 {
58         int err;
59         struct i2c_client *new_client;
60
61         if (! keywest_ctx)
62                 return -EINVAL;
63
64         if (strncmp(i2c_device_name(adapter), "mac-io", 6))
65                 return 0; /* ignored */
66
67         new_client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
68         if (! new_client)
69                 return -ENOMEM;
70
71         new_client->addr = keywest_ctx->addr;
72         i2c_set_clientdata(new_client, keywest_ctx);
73         new_client->adapter = adapter;
74         new_client->driver = &keywest_driver;
75         new_client->flags = 0;
76
77         strcpy(i2c_device_name(new_client), keywest_ctx->name);
78         keywest_ctx->client = new_client;
79         
80         /* Tell the i2c layer a new client has arrived */
81         if (i2c_attach_client(new_client)) {
82                 snd_printk(KERN_ERR "tumbler: cannot attach i2c client\n");
83                 err = -ENODEV;
84                 goto __err;
85         }
86
87         return 0;
88
89  __err:
90         kfree(new_client);
91         keywest_ctx->client = NULL;
92         return err;
93 }
94
95 static int keywest_detach_client(struct i2c_client *client)
96 {
97         if (! keywest_ctx)
98                 return 0;
99         if (client == keywest_ctx->client)
100                 keywest_ctx->client = NULL;
101
102         i2c_detach_client(client);
103         kfree(client);
104         return 0;
105 }
106
107 /* exported */
108 void snd_pmac_keywest_cleanup(struct pmac_keywest *i2c)
109 {
110         if (keywest_ctx && keywest_ctx == i2c) {
111                 i2c_del_driver(&keywest_driver);
112                 keywest_ctx = NULL;
113         }
114 }
115
116 int __init snd_pmac_tumbler_post_init(void)
117 {
118         int err;
119         
120         if (!keywest_ctx || !keywest_ctx->client)
121                 return -ENXIO;
122
123         if ((err = keywest_ctx->init_client(keywest_ctx)) < 0) {
124                 snd_printk(KERN_ERR "tumbler: %i :cannot initialize the MCS\n", err);
125                 return err;
126         }
127         return 0;
128 }
129
130 /* exported */
131 int __init snd_pmac_keywest_init(struct pmac_keywest *i2c)
132 {
133         int err;
134
135         if (keywest_ctx)
136                 return -EBUSY;
137
138         keywest_ctx = i2c;
139
140         if ((err = i2c_add_driver(&keywest_driver))) {
141                 snd_printk(KERN_ERR "cannot register keywest i2c driver\n");
142                 return err;
143         }
144         return 0;
145 }