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
);