Commit | Line | Data |
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1da177e4 LT |
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/i2c-dev.h> | |
27 | #include <linux/slab.h> | |
28 | #include <sound/core.h> | |
29 | #include "pmac.h" | |
30 | ||
31 | /* | |
32 | * we have to keep a static variable here since i2c attach_adapter | |
33 | * callback cannot pass a private data. | |
34 | */ | |
35 | static pmac_keywest_t *keywest_ctx; | |
36 | ||
37 | ||
38 | #define I2C_DRIVERID_KEYWEST 0xFEBA | |
39 | ||
40 | static int keywest_attach_adapter(struct i2c_adapter *adapter); | |
41 | static int keywest_detach_client(struct i2c_client *client); | |
42 | ||
43 | struct i2c_driver keywest_driver = { | |
44 | .name = "PMac Keywest Audio", | |
45 | .id = I2C_DRIVERID_KEYWEST, | |
46 | .flags = I2C_DF_NOTIFY, | |
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 = kmalloc(sizeof(struct i2c_client), GFP_KERNEL); | |
68 | if (! new_client) | |
69 | return -ENOMEM; | |
70 | ||
71 | memset(new_client, 0, sizeof(*new_client)); | |
72 | new_client->addr = keywest_ctx->addr; | |
73 | i2c_set_clientdata(new_client, keywest_ctx); | |
74 | new_client->adapter = adapter; | |
75 | new_client->driver = &keywest_driver; | |
76 | new_client->flags = 0; | |
77 | ||
78 | strcpy(i2c_device_name(new_client), keywest_ctx->name); | |
79 | keywest_ctx->client = new_client; | |
80 | ||
81 | /* Tell the i2c layer a new client has arrived */ | |
82 | if (i2c_attach_client(new_client)) { | |
83 | snd_printk(KERN_ERR "tumbler: cannot attach i2c client\n"); | |
84 | err = -ENODEV; | |
85 | goto __err; | |
86 | } | |
87 | ||
88 | return 0; | |
89 | ||
90 | __err: | |
91 | kfree(new_client); | |
92 | keywest_ctx->client = NULL; | |
93 | return err; | |
94 | } | |
95 | ||
96 | static int keywest_detach_client(struct i2c_client *client) | |
97 | { | |
98 | if (! keywest_ctx) | |
99 | return 0; | |
100 | if (client == keywest_ctx->client) | |
101 | keywest_ctx->client = NULL; | |
102 | ||
103 | i2c_detach_client(client); | |
104 | kfree(client); | |
105 | return 0; | |
106 | } | |
107 | ||
108 | /* exported */ | |
109 | void snd_pmac_keywest_cleanup(pmac_keywest_t *i2c) | |
110 | { | |
111 | if (keywest_ctx && keywest_ctx == i2c) { | |
112 | i2c_del_driver(&keywest_driver); | |
113 | keywest_ctx = NULL; | |
114 | } | |
115 | } | |
116 | ||
117 | int __init snd_pmac_tumbler_post_init(void) | |
118 | { | |
119 | int err; | |
120 | ||
121 | if ((err = keywest_ctx->init_client(keywest_ctx)) < 0) { | |
122 | snd_printk(KERN_ERR "tumbler: %i :cannot initialize the MCS\n", err); | |
123 | return err; | |
124 | } | |
125 | return 0; | |
126 | } | |
127 | ||
128 | /* exported */ | |
129 | int __init snd_pmac_keywest_init(pmac_keywest_t *i2c) | |
130 | { | |
131 | int err; | |
132 | ||
133 | if (keywest_ctx) | |
134 | return -EBUSY; | |
135 | ||
136 | keywest_ctx = i2c; | |
137 | ||
138 | if ((err = i2c_add_driver(&keywest_driver))) { | |
139 | snd_printk(KERN_ERR "cannot register keywest i2c driver\n"); | |
140 | return err; | |
141 | } | |
142 | return 0; | |
143 | } |