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Commit | Line | Data |
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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * common keywest i2c layer | |
4 | * | |
5 | * Copyright (c) by Takashi Iwai <tiwai@suse.de> | |
1da177e4 LT |
6 | */ |
7 | ||
8 | ||
1da177e4 LT |
9 | #include <linux/init.h> |
10 | #include <linux/i2c.h> | |
11 | #include <linux/delay.h> | |
654e2751 | 12 | #include <linux/module.h> |
1da177e4 LT |
13 | #include <sound/core.h> |
14 | #include "pmac.h" | |
15 | ||
65b29f50 | 16 | static struct pmac_keywest *keywest_ctx; |
28760c19 | 17 | static bool keywest_probed; |
1da177e4 | 18 | |
5de4155b JD |
19 | static int keywest_probe(struct i2c_client *client, |
20 | const struct i2c_device_id *id) | |
21 | { | |
28760c19 WS |
22 | keywest_probed = true; |
23 | /* If instantiated via i2c-powermac, we still need to set the client */ | |
24 | if (!keywest_ctx->client) | |
25 | keywest_ctx->client = client; | |
5de4155b JD |
26 | i2c_set_clientdata(client, keywest_ctx); |
27 | return 0; | |
28 | } | |
29 | ||
30 | /* | |
31 | * This is kind of a hack, best would be to turn powermac to fixed i2c | |
32 | * bus numbers and declare the sound device as part of platform | |
33 | * initialization | |
34 | */ | |
1da177e4 LT |
35 | static int keywest_attach_adapter(struct i2c_adapter *adapter) |
36 | { | |
5de4155b | 37 | struct i2c_board_info info; |
04a9af2e | 38 | struct i2c_client *client; |
1da177e4 LT |
39 | |
40 | if (! keywest_ctx) | |
41 | return -EINVAL; | |
42 | ||
903dba1e | 43 | if (strncmp(adapter->name, "mac-io", 6)) |
ac397c80 | 44 | return -EINVAL; /* ignored */ |
1da177e4 | 45 | |
5de4155b | 46 | memset(&info, 0, sizeof(struct i2c_board_info)); |
75b1a8f9 | 47 | strscpy(info.type, "keywest", I2C_NAME_SIZE); |
5de4155b | 48 | info.addr = keywest_ctx->addr; |
04a9af2e WS |
49 | client = i2c_new_client_device(adapter, &info); |
50 | if (IS_ERR(client)) | |
51 | return PTR_ERR(client); | |
52 | keywest_ctx->client = client; | |
53 | ||
18c40784 TI |
54 | /* |
55 | * We know the driver is already loaded, so the device should be | |
56 | * already bound. If not it means binding failed, and then there | |
57 | * is no point in keeping the device instantiated. | |
58 | */ | |
a7cde6d2 | 59 | if (!keywest_ctx->client->dev.driver) { |
18c40784 TI |
60 | i2c_unregister_device(keywest_ctx->client); |
61 | keywest_ctx->client = NULL; | |
62 | return -ENODEV; | |
63 | } | |
1da177e4 | 64 | |
5de4155b JD |
65 | /* |
66 | * Let i2c-core delete that device on driver removal. | |
67 | * This is safe because i2c-core holds the core_lock mutex for us. | |
68 | */ | |
69 | list_add_tail(&keywest_ctx->client->detected, | |
a7cde6d2 | 70 | &to_i2c_driver(keywest_ctx->client->dev.driver)->clients); |
1da177e4 | 71 | return 0; |
1da177e4 LT |
72 | } |
73 | ||
5de4155b | 74 | static int keywest_remove(struct i2c_client *client) |
1da177e4 LT |
75 | { |
76 | if (! keywest_ctx) | |
77 | return 0; | |
78 | if (client == keywest_ctx->client) | |
79 | keywest_ctx->client = NULL; | |
80 | ||
1da177e4 LT |
81 | return 0; |
82 | } | |
83 | ||
5de4155b JD |
84 | |
85 | static const struct i2c_device_id keywest_i2c_id[] = { | |
28760c19 WS |
86 | { "MAC,tas3004", 0 }, /* instantiated by i2c-powermac */ |
87 | { "keywest", 0 }, /* instantiated by us if needed */ | |
5de4155b JD |
88 | { } |
89 | }; | |
a2bc2af6 | 90 | MODULE_DEVICE_TABLE(i2c, keywest_i2c_id); |
5de4155b | 91 | |
a656cbf0 | 92 | static struct i2c_driver keywest_driver = { |
5de4155b JD |
93 | .driver = { |
94 | .name = "PMac Keywest Audio", | |
95 | }, | |
5de4155b JD |
96 | .probe = keywest_probe, |
97 | .remove = keywest_remove, | |
98 | .id_table = keywest_i2c_id, | |
99 | }; | |
100 | ||
1da177e4 | 101 | /* exported */ |
65b29f50 | 102 | void snd_pmac_keywest_cleanup(struct pmac_keywest *i2c) |
1da177e4 LT |
103 | { |
104 | if (keywest_ctx && keywest_ctx == i2c) { | |
105 | i2c_del_driver(&keywest_driver); | |
106 | keywest_ctx = NULL; | |
107 | } | |
108 | } | |
109 | ||
15afafc2 | 110 | int snd_pmac_tumbler_post_init(void) |
1da177e4 LT |
111 | { |
112 | int err; | |
113 | ||
783eaf46 TI |
114 | if (!keywest_ctx || !keywest_ctx->client) |
115 | return -ENXIO; | |
116 | ||
1da177e4 LT |
117 | if ((err = keywest_ctx->init_client(keywest_ctx)) < 0) { |
118 | snd_printk(KERN_ERR "tumbler: %i :cannot initialize the MCS\n", err); | |
119 | return err; | |
120 | } | |
121 | return 0; | |
122 | } | |
123 | ||
124 | /* exported */ | |
15afafc2 | 125 | int snd_pmac_keywest_init(struct pmac_keywest *i2c) |
1da177e4 | 126 | { |
ac397c80 WS |
127 | struct i2c_adapter *adap; |
128 | int err, i = 0; | |
1da177e4 LT |
129 | |
130 | if (keywest_ctx) | |
131 | return -EBUSY; | |
132 | ||
ac397c80 WS |
133 | adap = i2c_get_adapter(0); |
134 | if (!adap) | |
135 | return -EPROBE_DEFER; | |
136 | ||
1da177e4 LT |
137 | keywest_ctx = i2c; |
138 | ||
139 | if ((err = i2c_add_driver(&keywest_driver))) { | |
140 | snd_printk(KERN_ERR "cannot register keywest i2c driver\n"); | |
ac397c80 | 141 | i2c_put_adapter(adap); |
1da177e4 LT |
142 | return err; |
143 | } | |
ac397c80 | 144 | |
28760c19 WS |
145 | /* There was already a device from i2c-powermac. Great, let's return */ |
146 | if (keywest_probed) | |
147 | return 0; | |
148 | ||
ac397c80 WS |
149 | /* We assume Macs have consecutive I2C bus numbers starting at 0 */ |
150 | while (adap) { | |
28760c19 | 151 | /* Scan for devices to be bound to */ |
ac397c80 WS |
152 | err = keywest_attach_adapter(adap); |
153 | if (!err) | |
154 | return 0; | |
155 | i2c_put_adapter(adap); | |
156 | adap = i2c_get_adapter(++i); | |
157 | } | |
158 | ||
159 | return -ENODEV; | |
1da177e4 | 160 | } |