Commit | Line | Data |
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1da177e4 LT |
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 | ||
1da177e4 LT |
22 | #include <linux/init.h> |
23 | #include <linux/i2c.h> | |
24 | #include <linux/delay.h> | |
1da177e4 LT |
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 | */ | |
65b29f50 | 32 | static struct pmac_keywest *keywest_ctx; |
1da177e4 | 33 | |
28760c19 | 34 | static bool keywest_probed; |
1da177e4 | 35 | |
5de4155b JD |
36 | static int keywest_probe(struct i2c_client *client, |
37 | const struct i2c_device_id *id) | |
38 | { | |
28760c19 WS |
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; | |
5de4155b JD |
43 | i2c_set_clientdata(client, keywest_ctx); |
44 | return 0; | |
45 | } | |
46 | ||
47 | /* | |
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 | |
50 | * initialization | |
51 | */ | |
1da177e4 LT |
52 | static int keywest_attach_adapter(struct i2c_adapter *adapter) |
53 | { | |
5de4155b | 54 | struct i2c_board_info info; |
1da177e4 LT |
55 | |
56 | if (! keywest_ctx) | |
57 | return -EINVAL; | |
58 | ||
903dba1e | 59 | if (strncmp(adapter->name, "mac-io", 6)) |
ac397c80 | 60 | return -EINVAL; /* ignored */ |
1da177e4 | 61 | |
5de4155b JD |
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); | |
18c40784 TI |
66 | if (!keywest_ctx->client) |
67 | return -ENODEV; | |
68 | /* | |
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. | |
72 | */ | |
a7cde6d2 | 73 | if (!keywest_ctx->client->dev.driver) { |
18c40784 TI |
74 | i2c_unregister_device(keywest_ctx->client); |
75 | keywest_ctx->client = NULL; | |
76 | return -ENODEV; | |
77 | } | |
1da177e4 | 78 | |
5de4155b JD |
79 | /* |
80 | * Let i2c-core delete that device on driver removal. | |
81 | * This is safe because i2c-core holds the core_lock mutex for us. | |
82 | */ | |
83 | list_add_tail(&keywest_ctx->client->detected, | |
a7cde6d2 | 84 | &to_i2c_driver(keywest_ctx->client->dev.driver)->clients); |
1da177e4 | 85 | return 0; |
1da177e4 LT |
86 | } |
87 | ||
5de4155b | 88 | static int keywest_remove(struct i2c_client *client) |
1da177e4 LT |
89 | { |
90 | if (! keywest_ctx) | |
91 | return 0; | |
92 | if (client == keywest_ctx->client) | |
93 | keywest_ctx->client = NULL; | |
94 | ||
1da177e4 LT |
95 | return 0; |
96 | } | |
97 | ||
5de4155b JD |
98 | |
99 | static const struct i2c_device_id keywest_i2c_id[] = { | |
28760c19 WS |
100 | { "MAC,tas3004", 0 }, /* instantiated by i2c-powermac */ |
101 | { "keywest", 0 }, /* instantiated by us if needed */ | |
5de4155b JD |
102 | { } |
103 | }; | |
104 | ||
a656cbf0 | 105 | static struct i2c_driver keywest_driver = { |
5de4155b JD |
106 | .driver = { |
107 | .name = "PMac Keywest Audio", | |
108 | }, | |
5de4155b JD |
109 | .probe = keywest_probe, |
110 | .remove = keywest_remove, | |
111 | .id_table = keywest_i2c_id, | |
112 | }; | |
113 | ||
1da177e4 | 114 | /* exported */ |
65b29f50 | 115 | void snd_pmac_keywest_cleanup(struct pmac_keywest *i2c) |
1da177e4 LT |
116 | { |
117 | if (keywest_ctx && keywest_ctx == i2c) { | |
118 | i2c_del_driver(&keywest_driver); | |
119 | keywest_ctx = NULL; | |
120 | } | |
121 | } | |
122 | ||
15afafc2 | 123 | int snd_pmac_tumbler_post_init(void) |
1da177e4 LT |
124 | { |
125 | int err; | |
126 | ||
783eaf46 TI |
127 | if (!keywest_ctx || !keywest_ctx->client) |
128 | return -ENXIO; | |
129 | ||
1da177e4 LT |
130 | if ((err = keywest_ctx->init_client(keywest_ctx)) < 0) { |
131 | snd_printk(KERN_ERR "tumbler: %i :cannot initialize the MCS\n", err); | |
132 | return err; | |
133 | } | |
134 | return 0; | |
135 | } | |
136 | ||
137 | /* exported */ | |
15afafc2 | 138 | int snd_pmac_keywest_init(struct pmac_keywest *i2c) |
1da177e4 | 139 | { |
ac397c80 WS |
140 | struct i2c_adapter *adap; |
141 | int err, i = 0; | |
1da177e4 LT |
142 | |
143 | if (keywest_ctx) | |
144 | return -EBUSY; | |
145 | ||
ac397c80 WS |
146 | adap = i2c_get_adapter(0); |
147 | if (!adap) | |
148 | return -EPROBE_DEFER; | |
149 | ||
1da177e4 LT |
150 | keywest_ctx = i2c; |
151 | ||
152 | if ((err = i2c_add_driver(&keywest_driver))) { | |
153 | snd_printk(KERN_ERR "cannot register keywest i2c driver\n"); | |
ac397c80 | 154 | i2c_put_adapter(adap); |
1da177e4 LT |
155 | return err; |
156 | } | |
ac397c80 | 157 | |
28760c19 WS |
158 | /* There was already a device from i2c-powermac. Great, let's return */ |
159 | if (keywest_probed) | |
160 | return 0; | |
161 | ||
ac397c80 WS |
162 | /* We assume Macs have consecutive I2C bus numbers starting at 0 */ |
163 | while (adap) { | |
28760c19 | 164 | /* Scan for devices to be bound to */ |
ac397c80 WS |
165 | err = keywest_attach_adapter(adap); |
166 | if (!err) | |
167 | return 0; | |
168 | i2c_put_adapter(adap); | |
169 | adap = i2c_get_adapter(++i); | |
170 | } | |
171 | ||
172 | return -ENODEV; | |
1da177e4 | 173 | } |