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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 <linux/init.h> |
23 | #include <linux/i2c.h> |
24 | #include <linux/delay.h> |
25 | #include <sound/core.h> |
26 | #include "pmac.h" |
27 | |
28 | /* |
29 | * we have to keep a static variable here since i2c attach_adapter |
30 | * callback cannot pass a private data. |
31 | */ |
32 | static struct pmac_keywest *keywest_ctx; |
33 | |
34 | |
35 | static int keywest_probe(struct i2c_client *client, |
36 | const struct i2c_device_id *id) |
37 | { |
38 | i2c_set_clientdata(client, keywest_ctx); |
39 | return 0; |
40 | } |
41 | |
42 | /* |
43 | * This is kind of a hack, best would be to turn powermac to fixed i2c |
44 | * bus numbers and declare the sound device as part of platform |
45 | * initialization |
46 | */ |
47 | static int keywest_attach_adapter(struct i2c_adapter *adapter) |
48 | { |
49 | struct i2c_board_info info; |
50 | |
51 | if (! keywest_ctx) |
52 | return -EINVAL; |
53 | |
54 | if (strncmp(adapter->name, "mac-io", 6)) |
55 | return 0; /* ignored */ |
56 | |
57 | memset(&info, 0, sizeof(struct i2c_board_info)); |
58 | strlcpy(info.type, "keywest", I2C_NAME_SIZE); |
59 | info.addr = keywest_ctx->addr; |
60 | keywest_ctx->client = i2c_new_device(adapter, &info); |
61 | if (!keywest_ctx->client) |
62 | return -ENODEV; |
63 | /* |
64 | * We know the driver is already loaded, so the device should be |
65 | * already bound. If not it means binding failed, and then there |
66 | * is no point in keeping the device instantiated. |
67 | */ |
68 | if (!keywest_ctx->client->driver) { |
69 | i2c_unregister_device(keywest_ctx->client); |
70 | keywest_ctx->client = NULL; |
71 | return -ENODEV; |
72 | } |
73 | |
74 | /* |
75 | * Let i2c-core delete that device on driver removal. |
76 | * This is safe because i2c-core holds the core_lock mutex for us. |
77 | */ |
78 | list_add_tail(&keywest_ctx->client->detected, |
79 | &keywest_ctx->client->driver->clients); |
80 | return 0; |
81 | } |
82 | |
83 | static int keywest_remove(struct i2c_client *client) |
84 | { |
85 | i2c_set_clientdata(client, NULL); |
86 | if (! keywest_ctx) |
87 | return 0; |
88 | if (client == keywest_ctx->client) |
89 | keywest_ctx->client = NULL; |
90 | |
91 | return 0; |
92 | } |
93 | |
94 | |
95 | static const struct i2c_device_id keywest_i2c_id[] = { |
96 | { "keywest", 0 }, |
97 | { } |
98 | }; |
99 | |
100 | static struct i2c_driver keywest_driver = { |
101 | .driver = { |
102 | .name = "PMac Keywest Audio", |
103 | }, |
104 | .attach_adapter = keywest_attach_adapter, |
105 | .probe = keywest_probe, |
106 | .remove = keywest_remove, |
107 | .id_table = keywest_i2c_id, |
108 | }; |
109 | |
110 | /* exported */ |
111 | void snd_pmac_keywest_cleanup(struct pmac_keywest *i2c) |
112 | { |
113 | if (keywest_ctx && keywest_ctx == i2c) { |
114 | i2c_del_driver(&keywest_driver); |
115 | keywest_ctx = NULL; |
116 | } |
117 | } |
118 | |
119 | int __devinit snd_pmac_tumbler_post_init(void) |
120 | { |
121 | int err; |
122 | |
123 | if (!keywest_ctx || !keywest_ctx->client) |
124 | return -ENXIO; |
125 | |
126 | if ((err = keywest_ctx->init_client(keywest_ctx)) < 0) { |
127 | snd_printk(KERN_ERR "tumbler: %i :cannot initialize the MCS\n", err); |
128 | return err; |
129 | } |
130 | return 0; |
131 | } |
132 | |
133 | /* exported */ |
134 | int __devinit snd_pmac_keywest_init(struct pmac_keywest *i2c) |
135 | { |
136 | int err; |
137 | |
138 | if (keywest_ctx) |
139 | return -EBUSY; |
140 | |
141 | keywest_ctx = i2c; |
142 | |
143 | if ((err = i2c_add_driver(&keywest_driver))) { |
144 | snd_printk(KERN_ERR "cannot register keywest i2c driver\n"); |
145 | return err; |
146 | } |
147 | return 0; |
148 | } |
149 |
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