2 * common keywest i2c layer
4 * Copyright (c) by Takashi Iwai <tiwai@suse.de>
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.
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.
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
22 #include <linux/init.h>
23 #include <linux/i2c.h>
24 #include <linux/delay.h>
25 #include <sound/core.h>
29 * we have to keep a static variable here since i2c attach_adapter
30 * callback cannot pass a private data.
32 static struct pmac_keywest *keywest_ctx;
34 static bool keywest_probed;
36 static int keywest_probe(struct i2c_client *client,
37 const struct i2c_device_id *id)
39 keywest_probed = true;
40 /* If instantiated via i2c-powermac, we still need to set the client */
41 if (!keywest_ctx->client)
42 keywest_ctx->client = client;
43 i2c_set_clientdata(client, keywest_ctx);
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
52 static int keywest_attach_adapter(struct i2c_adapter *adapter)
54 struct i2c_board_info info;
59 if (strncmp(adapter->name, "mac-io", 6))
60 return -EINVAL; /* ignored */
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);
66 if (!keywest_ctx->client)
69 * We know the driver is already loaded, so the device should be
70 * already bound. If not it means binding failed, and then there
71 * is no point in keeping the device instantiated.
73 if (!keywest_ctx->client->dev.driver) {
74 i2c_unregister_device(keywest_ctx->client);
75 keywest_ctx->client = NULL;
80 * Let i2c-core delete that device on driver removal.
81 * This is safe because i2c-core holds the core_lock mutex for us.
83 list_add_tail(&keywest_ctx->client->detected,
84 &to_i2c_driver(keywest_ctx->client->dev.driver)->clients);
88 static int keywest_remove(struct i2c_client *client)
92 if (client == keywest_ctx->client)
93 keywest_ctx->client = NULL;
99 static const struct i2c_device_id keywest_i2c_id[] = {
100 { "MAC,tas3004", 0 }, /* instantiated by i2c-powermac */
101 { "keywest", 0 }, /* instantiated by us if needed */
105 static struct i2c_driver keywest_driver = {
107 .name = "PMac Keywest Audio",
109 .probe = keywest_probe,
110 .remove = keywest_remove,
111 .id_table = keywest_i2c_id,
115 void snd_pmac_keywest_cleanup(struct pmac_keywest *i2c)
117 if (keywest_ctx && keywest_ctx == i2c) {
118 i2c_del_driver(&keywest_driver);
123 int snd_pmac_tumbler_post_init(void)
127 if (!keywest_ctx || !keywest_ctx->client)
130 if ((err = keywest_ctx->init_client(keywest_ctx)) < 0) {
131 snd_printk(KERN_ERR "tumbler: %i :cannot initialize the MCS\n", err);
138 int snd_pmac_keywest_init(struct pmac_keywest *i2c)
140 struct i2c_adapter *adap;
146 adap = i2c_get_adapter(0);
148 return -EPROBE_DEFER;
152 if ((err = i2c_add_driver(&keywest_driver))) {
153 snd_printk(KERN_ERR "cannot register keywest i2c driver\n");
154 i2c_put_adapter(adap);
158 /* There was already a device from i2c-powermac. Great, let's return */
162 /* We assume Macs have consecutive I2C bus numbers starting at 0 */
164 /* Scan for devices to be bound to */
165 err = keywest_attach_adapter(adap);
168 i2c_put_adapter(adap);
169 adap = i2c_get_adapter(++i);