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 | ||
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 | ||
5de4155b JD |
36 | static int keywest_probe(struct i2c_client *client, |
37 | const struct i2c_device_id *id) | |
38 | { | |
39 | i2c_set_clientdata(client, keywest_ctx); | |
40 | return 0; | |
41 | } | |
42 | ||
43 | /* | |
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 | |
46 | * initialization | |
47 | */ | |
1da177e4 LT |
48 | static int keywest_attach_adapter(struct i2c_adapter *adapter) |
49 | { | |
5de4155b | 50 | struct i2c_board_info info; |
1da177e4 LT |
51 | |
52 | if (! keywest_ctx) | |
53 | return -EINVAL; | |
54 | ||
903dba1e | 55 | if (strncmp(adapter->name, "mac-io", 6)) |
1da177e4 LT |
56 | return 0; /* ignored */ |
57 | ||
5de4155b JD |
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); | |
18c40784 TI |
62 | if (!keywest_ctx->client) |
63 | return -ENODEV; | |
64 | /* | |
65 | * We know the driver is already loaded, so the device should be | |
66 | * already bound. If not it means binding failed, and then there | |
67 | * is no point in keeping the device instantiated. | |
68 | */ | |
69 | if (!keywest_ctx->client->driver) { | |
70 | i2c_unregister_device(keywest_ctx->client); | |
71 | keywest_ctx->client = NULL; | |
72 | return -ENODEV; | |
73 | } | |
1da177e4 | 74 | |
5de4155b JD |
75 | /* |
76 | * Let i2c-core delete that device on driver removal. | |
77 | * This is safe because i2c-core holds the core_lock mutex for us. | |
78 | */ | |
79 | list_add_tail(&keywest_ctx->client->detected, | |
80 | &keywest_ctx->client->driver->clients); | |
1da177e4 | 81 | return 0; |
1da177e4 LT |
82 | } |
83 | ||
5de4155b | 84 | static int keywest_remove(struct i2c_client *client) |
1da177e4 | 85 | { |
5de4155b | 86 | i2c_set_clientdata(client, NULL); |
1da177e4 LT |
87 | if (! keywest_ctx) |
88 | return 0; | |
89 | if (client == keywest_ctx->client) | |
90 | keywest_ctx->client = NULL; | |
91 | ||
1da177e4 LT |
92 | return 0; |
93 | } | |
94 | ||
5de4155b JD |
95 | |
96 | static const struct i2c_device_id keywest_i2c_id[] = { | |
97 | { "keywest", 0 }, | |
98 | { } | |
99 | }; | |
100 | ||
a656cbf0 | 101 | static struct i2c_driver keywest_driver = { |
5de4155b JD |
102 | .driver = { |
103 | .name = "PMac Keywest Audio", | |
104 | }, | |
105 | .attach_adapter = keywest_attach_adapter, | |
106 | .probe = keywest_probe, | |
107 | .remove = keywest_remove, | |
108 | .id_table = keywest_i2c_id, | |
109 | }; | |
110 | ||
1da177e4 | 111 | /* exported */ |
65b29f50 | 112 | void snd_pmac_keywest_cleanup(struct pmac_keywest *i2c) |
1da177e4 LT |
113 | { |
114 | if (keywest_ctx && keywest_ctx == i2c) { | |
115 | i2c_del_driver(&keywest_driver); | |
116 | keywest_ctx = NULL; | |
117 | } | |
118 | } | |
119 | ||
5c9b6e9e | 120 | int __devinit snd_pmac_tumbler_post_init(void) |
1da177e4 LT |
121 | { |
122 | int err; | |
123 | ||
783eaf46 TI |
124 | if (!keywest_ctx || !keywest_ctx->client) |
125 | return -ENXIO; | |
126 | ||
1da177e4 LT |
127 | if ((err = keywest_ctx->init_client(keywest_ctx)) < 0) { |
128 | snd_printk(KERN_ERR "tumbler: %i :cannot initialize the MCS\n", err); | |
129 | return err; | |
130 | } | |
131 | return 0; | |
132 | } | |
133 | ||
134 | /* exported */ | |
5c9b6e9e | 135 | int __devinit snd_pmac_keywest_init(struct pmac_keywest *i2c) |
1da177e4 LT |
136 | { |
137 | int err; | |
138 | ||
139 | if (keywest_ctx) | |
140 | return -EBUSY; | |
141 | ||
142 | keywest_ctx = i2c; | |
143 | ||
144 | if ((err = i2c_add_driver(&keywest_driver))) { | |
145 | snd_printk(KERN_ERR "cannot register keywest i2c driver\n"); | |
146 | return err; | |
147 | } | |
148 | return 0; | |
149 | } |