blob: 01aecc2b50738353ad8a96f618c01be631981240 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/init.h>
23#include <linux/i2c.h>
24#include <linux/delay.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#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 */
Takashi Iwai65b29f52005-11-17 15:09:46 +010032static struct pmac_keywest *keywest_ctx;
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
34
Jean Delvare5de41552009-04-20 22:56:59 +020035static 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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070047static int keywest_attach_adapter(struct i2c_adapter *adapter)
48{
Jean Delvare5de41552009-04-20 22:56:59 +020049 struct i2c_board_info info;
Linus Torvalds1da177e2005-04-16 15:20:36 -070050
51 if (! keywest_ctx)
52 return -EINVAL;
53
Jean Delvare903dba12009-05-14 14:37:21 +020054 if (strncmp(adapter->name, "mac-io", 6))
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 return 0; /* ignored */
56
Jean Delvare5de41552009-04-20 22:56:59 +020057 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);
Takashi Iwai18c40782009-10-01 07:46:33 +020061 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 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070073
Jean Delvare5de41552009-04-20 22:56:59 +020074 /*
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);
Linus Torvalds1da177e2005-04-16 15:20:36 -070080 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070081}
82
Jean Delvare5de41552009-04-20 22:56:59 +020083static int keywest_remove(struct i2c_client *client)
Linus Torvalds1da177e2005-04-16 15:20:36 -070084{
85 if (! keywest_ctx)
86 return 0;
87 if (client == keywest_ctx->client)
88 keywest_ctx->client = NULL;
89
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 return 0;
91}
92
Jean Delvare5de41552009-04-20 22:56:59 +020093
94static const struct i2c_device_id keywest_i2c_id[] = {
95 { "keywest", 0 },
96 { }
97};
98
Jean Delvarea656cbf2009-10-01 18:08:18 +020099static struct i2c_driver keywest_driver = {
Jean Delvare5de41552009-04-20 22:56:59 +0200100 .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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109/* exported */
Takashi Iwai65b29f52005-11-17 15:09:46 +0100110void snd_pmac_keywest_cleanup(struct pmac_keywest *i2c)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111{
112 if (keywest_ctx && keywest_ctx == i2c) {
113 i2c_del_driver(&keywest_driver);
114 keywest_ctx = NULL;
115 }
116}
117
Bill Pemberton15afafc2012-12-06 12:35:23 -0500118int snd_pmac_tumbler_post_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119{
120 int err;
121
Takashi Iwai783eaf42006-09-17 22:00:51 +0200122 if (!keywest_ctx || !keywest_ctx->client)
123 return -ENXIO;
124
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 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 */
Bill Pemberton15afafc2012-12-06 12:35:23 -0500133int snd_pmac_keywest_init(struct pmac_keywest *i2c)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134{
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}