Commit | Line | Data |
---|---|---|
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 | ||
1da177e4 LT |
22 | #include <linux/init.h> |
23 | #include <linux/i2c.h> | |
24 | #include <linux/delay.h> | |
1da177e4 LT |
25 | #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 | */ | |
65b29f50 | 33 | static struct pmac_keywest *keywest_ctx; |
1da177e4 LT |
34 | |
35 | ||
1da177e4 LT |
36 | #ifndef i2c_device_name |
37 | #define i2c_device_name(x) ((x)->name) | |
38 | #endif | |
39 | ||
5de4155b JD |
40 | static int keywest_probe(struct i2c_client *client, |
41 | const struct i2c_device_id *id) | |
42 | { | |
43 | i2c_set_clientdata(client, keywest_ctx); | |
44 | return 0; | |
45 | } | |
46 | ||
47 | /* | |
48 | * This is kind of a hack, best would be to turn powermac to fixed i2c | |
49 | * bus numbers and declare the sound device as part of platform | |
50 | * initialization | |
51 | */ | |
1da177e4 LT |
52 | static int keywest_attach_adapter(struct i2c_adapter *adapter) |
53 | { | |
5de4155b | 54 | struct i2c_board_info info; |
1da177e4 LT |
55 | |
56 | if (! keywest_ctx) | |
57 | return -EINVAL; | |
58 | ||
59 | if (strncmp(i2c_device_name(adapter), "mac-io", 6)) | |
60 | return 0; /* ignored */ | |
61 | ||
5de4155b JD |
62 | memset(&info, 0, sizeof(struct i2c_board_info)); |
63 | strlcpy(info.type, "keywest", I2C_NAME_SIZE); | |
64 | info.addr = keywest_ctx->addr; | |
65 | keywest_ctx->client = i2c_new_device(adapter, &info); | |
1da177e4 | 66 | |
5de4155b JD |
67 | /* |
68 | * Let i2c-core delete that device on driver removal. | |
69 | * This is safe because i2c-core holds the core_lock mutex for us. | |
70 | */ | |
71 | list_add_tail(&keywest_ctx->client->detected, | |
72 | &keywest_ctx->client->driver->clients); | |
1da177e4 | 73 | return 0; |
1da177e4 LT |
74 | } |
75 | ||
5de4155b | 76 | static int keywest_remove(struct i2c_client *client) |
1da177e4 | 77 | { |
5de4155b | 78 | i2c_set_clientdata(client, NULL); |
1da177e4 LT |
79 | if (! keywest_ctx) |
80 | return 0; | |
81 | if (client == keywest_ctx->client) | |
82 | keywest_ctx->client = NULL; | |
83 | ||
1da177e4 LT |
84 | return 0; |
85 | } | |
86 | ||
5de4155b JD |
87 | |
88 | static const struct i2c_device_id keywest_i2c_id[] = { | |
89 | { "keywest", 0 }, | |
90 | { } | |
91 | }; | |
92 | ||
93 | struct i2c_driver keywest_driver = { | |
94 | .driver = { | |
95 | .name = "PMac Keywest Audio", | |
96 | }, | |
97 | .attach_adapter = keywest_attach_adapter, | |
98 | .probe = keywest_probe, | |
99 | .remove = keywest_remove, | |
100 | .id_table = keywest_i2c_id, | |
101 | }; | |
102 | ||
1da177e4 | 103 | /* exported */ |
65b29f50 | 104 | void snd_pmac_keywest_cleanup(struct pmac_keywest *i2c) |
1da177e4 LT |
105 | { |
106 | if (keywest_ctx && keywest_ctx == i2c) { | |
107 | i2c_del_driver(&keywest_driver); | |
108 | keywest_ctx = NULL; | |
109 | } | |
110 | } | |
111 | ||
112 | int __init snd_pmac_tumbler_post_init(void) | |
113 | { | |
114 | int err; | |
115 | ||
783eaf46 TI |
116 | if (!keywest_ctx || !keywest_ctx->client) |
117 | return -ENXIO; | |
118 | ||
1da177e4 LT |
119 | if ((err = keywest_ctx->init_client(keywest_ctx)) < 0) { |
120 | snd_printk(KERN_ERR "tumbler: %i :cannot initialize the MCS\n", err); | |
121 | return err; | |
122 | } | |
123 | return 0; | |
124 | } | |
125 | ||
126 | /* exported */ | |
65b29f50 | 127 | int __init snd_pmac_keywest_init(struct pmac_keywest *i2c) |
1da177e4 LT |
128 | { |
129 | int err; | |
130 | ||
131 | if (keywest_ctx) | |
132 | return -EBUSY; | |
133 | ||
134 | keywest_ctx = i2c; | |
135 | ||
136 | if ((err = i2c_add_driver(&keywest_driver))) { | |
137 | snd_printk(KERN_ERR "cannot register keywest i2c driver\n"); | |
138 | return err; | |
139 | } | |
140 | return 0; | |
141 | } |