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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> | |
654e2751 | 25 | #include <linux/module.h> |
1da177e4 LT |
26 | #include <sound/core.h> |
27 | #include "pmac.h" | |
28 | ||
29 | /* | |
30 | * we have to keep a static variable here since i2c attach_adapter | |
31 | * callback cannot pass a private data. | |
32 | */ | |
65b29f50 | 33 | static struct pmac_keywest *keywest_ctx; |
1da177e4 | 34 | |
28760c19 | 35 | static bool keywest_probed; |
1da177e4 | 36 | |
5de4155b JD |
37 | static int keywest_probe(struct i2c_client *client, |
38 | const struct i2c_device_id *id) | |
39 | { | |
28760c19 WS |
40 | keywest_probed = true; |
41 | /* If instantiated via i2c-powermac, we still need to set the client */ | |
42 | if (!keywest_ctx->client) | |
43 | keywest_ctx->client = client; | |
5de4155b JD |
44 | i2c_set_clientdata(client, keywest_ctx); |
45 | return 0; | |
46 | } | |
47 | ||
48 | /* | |
49 | * This is kind of a hack, best would be to turn powermac to fixed i2c | |
50 | * bus numbers and declare the sound device as part of platform | |
51 | * initialization | |
52 | */ | |
1da177e4 LT |
53 | static int keywest_attach_adapter(struct i2c_adapter *adapter) |
54 | { | |
5de4155b | 55 | struct i2c_board_info info; |
1da177e4 LT |
56 | |
57 | if (! keywest_ctx) | |
58 | return -EINVAL; | |
59 | ||
903dba1e | 60 | if (strncmp(adapter->name, "mac-io", 6)) |
ac397c80 | 61 | return -EINVAL; /* ignored */ |
1da177e4 | 62 | |
5de4155b JD |
63 | memset(&info, 0, sizeof(struct i2c_board_info)); |
64 | strlcpy(info.type, "keywest", I2C_NAME_SIZE); | |
65 | info.addr = keywest_ctx->addr; | |
66 | keywest_ctx->client = i2c_new_device(adapter, &info); | |
18c40784 TI |
67 | if (!keywest_ctx->client) |
68 | return -ENODEV; | |
69 | /* | |
70 | * We know the driver is already loaded, so the device should be | |
71 | * already bound. If not it means binding failed, and then there | |
72 | * is no point in keeping the device instantiated. | |
73 | */ | |
a7cde6d2 | 74 | if (!keywest_ctx->client->dev.driver) { |
18c40784 TI |
75 | i2c_unregister_device(keywest_ctx->client); |
76 | keywest_ctx->client = NULL; | |
77 | return -ENODEV; | |
78 | } | |
1da177e4 | 79 | |
5de4155b JD |
80 | /* |
81 | * Let i2c-core delete that device on driver removal. | |
82 | * This is safe because i2c-core holds the core_lock mutex for us. | |
83 | */ | |
84 | list_add_tail(&keywest_ctx->client->detected, | |
a7cde6d2 | 85 | &to_i2c_driver(keywest_ctx->client->dev.driver)->clients); |
1da177e4 | 86 | return 0; |
1da177e4 LT |
87 | } |
88 | ||
5de4155b | 89 | static int keywest_remove(struct i2c_client *client) |
1da177e4 LT |
90 | { |
91 | if (! keywest_ctx) | |
92 | return 0; | |
93 | if (client == keywest_ctx->client) | |
94 | keywest_ctx->client = NULL; | |
95 | ||
1da177e4 LT |
96 | return 0; |
97 | } | |
98 | ||
5de4155b JD |
99 | |
100 | static const struct i2c_device_id keywest_i2c_id[] = { | |
28760c19 WS |
101 | { "MAC,tas3004", 0 }, /* instantiated by i2c-powermac */ |
102 | { "keywest", 0 }, /* instantiated by us if needed */ | |
5de4155b JD |
103 | { } |
104 | }; | |
a2bc2af6 | 105 | MODULE_DEVICE_TABLE(i2c, keywest_i2c_id); |
5de4155b | 106 | |
a656cbf0 | 107 | static struct i2c_driver keywest_driver = { |
5de4155b JD |
108 | .driver = { |
109 | .name = "PMac Keywest Audio", | |
110 | }, | |
5de4155b JD |
111 | .probe = keywest_probe, |
112 | .remove = keywest_remove, | |
113 | .id_table = keywest_i2c_id, | |
114 | }; | |
115 | ||
1da177e4 | 116 | /* exported */ |
65b29f50 | 117 | void snd_pmac_keywest_cleanup(struct pmac_keywest *i2c) |
1da177e4 LT |
118 | { |
119 | if (keywest_ctx && keywest_ctx == i2c) { | |
120 | i2c_del_driver(&keywest_driver); | |
121 | keywest_ctx = NULL; | |
122 | } | |
123 | } | |
124 | ||
15afafc2 | 125 | int snd_pmac_tumbler_post_init(void) |
1da177e4 LT |
126 | { |
127 | int err; | |
128 | ||
783eaf46 TI |
129 | if (!keywest_ctx || !keywest_ctx->client) |
130 | return -ENXIO; | |
131 | ||
1da177e4 LT |
132 | if ((err = keywest_ctx->init_client(keywest_ctx)) < 0) { |
133 | snd_printk(KERN_ERR "tumbler: %i :cannot initialize the MCS\n", err); | |
134 | return err; | |
135 | } | |
136 | return 0; | |
137 | } | |
138 | ||
139 | /* exported */ | |
15afafc2 | 140 | int snd_pmac_keywest_init(struct pmac_keywest *i2c) |
1da177e4 | 141 | { |
ac397c80 WS |
142 | struct i2c_adapter *adap; |
143 | int err, i = 0; | |
1da177e4 LT |
144 | |
145 | if (keywest_ctx) | |
146 | return -EBUSY; | |
147 | ||
ac397c80 WS |
148 | adap = i2c_get_adapter(0); |
149 | if (!adap) | |
150 | return -EPROBE_DEFER; | |
151 | ||
1da177e4 LT |
152 | keywest_ctx = i2c; |
153 | ||
154 | if ((err = i2c_add_driver(&keywest_driver))) { | |
155 | snd_printk(KERN_ERR "cannot register keywest i2c driver\n"); | |
ac397c80 | 156 | i2c_put_adapter(adap); |
1da177e4 LT |
157 | return err; |
158 | } | |
ac397c80 | 159 | |
28760c19 WS |
160 | /* There was already a device from i2c-powermac. Great, let's return */ |
161 | if (keywest_probed) | |
162 | return 0; | |
163 | ||
ac397c80 WS |
164 | /* We assume Macs have consecutive I2C bus numbers starting at 0 */ |
165 | while (adap) { | |
28760c19 | 166 | /* Scan for devices to be bound to */ |
ac397c80 WS |
167 | err = keywest_attach_adapter(adap); |
168 | if (!err) | |
169 | return 0; | |
170 | i2c_put_adapter(adap); | |
171 | adap = i2c_get_adapter(++i); | |
172 | } | |
173 | ||
174 | return -ENODEV; | |
1da177e4 | 175 | } |