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
keywest_probe(struct i2c_client * client,const struct i2c_device_id * id)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 */
keywest_attach_adapter(struct i2c_adapter * adapter)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
keywest_remove(struct i2c_client * client)83 static int keywest_remove(struct i2c_client *client)
84 {
85 if (! keywest_ctx)
86 return 0;
87 if (client == keywest_ctx->client)
88 keywest_ctx->client = NULL;
89
90 return 0;
91 }
92
93
94 static const struct i2c_device_id keywest_i2c_id[] = {
95 { "keywest", 0 },
96 { }
97 };
98
99 static struct i2c_driver keywest_driver = {
100 .driver = {
101 .name = "PMac Keywest Audio",
102 },
103 .attach_adapter = keywest_attach_adapter,
104 .probe = keywest_probe,
105 .remove = keywest_remove,
106 .id_table = keywest_i2c_id,
107 };
108
109 /* exported */
snd_pmac_keywest_cleanup(struct pmac_keywest * i2c)110 void snd_pmac_keywest_cleanup(struct pmac_keywest *i2c)
111 {
112 if (keywest_ctx && keywest_ctx == i2c) {
113 i2c_del_driver(&keywest_driver);
114 keywest_ctx = NULL;
115 }
116 }
117
snd_pmac_tumbler_post_init(void)118 int __devinit snd_pmac_tumbler_post_init(void)
119 {
120 int err;
121
122 if (!keywest_ctx || !keywest_ctx->client)
123 return -ENXIO;
124
125 if ((err = keywest_ctx->init_client(keywest_ctx)) < 0) {
126 snd_printk(KERN_ERR "tumbler: %i :cannot initialize the MCS\n", err);
127 return err;
128 }
129 return 0;
130 }
131
132 /* exported */
snd_pmac_keywest_init(struct pmac_keywest * i2c)133 int __devinit snd_pmac_keywest_init(struct pmac_keywest *i2c)
134 {
135 int err;
136
137 if (keywest_ctx)
138 return -EBUSY;
139
140 keywest_ctx = i2c;
141
142 if ((err = i2c_add_driver(&keywest_driver))) {
143 snd_printk(KERN_ERR "cannot register keywest i2c driver\n");
144 return err;
145 }
146 return 0;
147 }
148