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9cb2173e EG |
1 | /* |
2 | * STK1160 driver | |
3 | * | |
4 | * Copyright (C) 2012 Ezequiel Garcia | |
5 | * <elezegarcia--a.t--gmail.com> | |
6 | * | |
7 | * Based on Easycap driver by R.M. Thomas | |
8 | * Copyright (C) 2010 R.M. Thomas | |
9 | * <rmthomas--a.t--sciolus.org> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 of the License, or | |
14 | * (at your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | * | |
21 | */ | |
22 | ||
23 | #include <linux/module.h> | |
24 | #include <sound/core.h> | |
25 | #include <sound/initval.h> | |
26 | #include <sound/ac97_codec.h> | |
27 | ||
28 | #include "stk1160.h" | |
29 | #include "stk1160-reg.h" | |
30 | ||
31 | static struct snd_ac97 *stk1160_ac97; | |
32 | ||
33 | static void stk1160_write_ac97(struct snd_ac97 *ac97, u16 reg, u16 value) | |
34 | { | |
35 | struct stk1160 *dev = ac97->private_data; | |
36 | ||
37 | /* Set codec register address */ | |
38 | stk1160_write_reg(dev, STK1160_AC97_ADDR, reg); | |
39 | ||
40 | /* Set codec command */ | |
41 | stk1160_write_reg(dev, STK1160_AC97_CMD, value & 0xff); | |
42 | stk1160_write_reg(dev, STK1160_AC97_CMD + 1, (value & 0xff00) >> 8); | |
43 | ||
44 | /* | |
45 | * Set command write bit to initiate write operation. | |
46 | * The bit will be cleared when transfer is done. | |
47 | */ | |
48 | stk1160_write_reg(dev, STK1160_AC97CTL_0, 0x8c); | |
49 | } | |
50 | ||
51 | static u16 stk1160_read_ac97(struct snd_ac97 *ac97, u16 reg) | |
52 | { | |
53 | struct stk1160 *dev = ac97->private_data; | |
54 | u8 vall = 0; | |
55 | u8 valh = 0; | |
56 | ||
57 | /* Set codec register address */ | |
58 | stk1160_write_reg(dev, STK1160_AC97_ADDR, reg); | |
59 | ||
60 | /* | |
61 | * Set command read bit to initiate read operation. | |
62 | * The bit will be cleared when transfer is done. | |
63 | */ | |
64 | stk1160_write_reg(dev, STK1160_AC97CTL_0, 0x8b); | |
65 | ||
66 | /* Retrieve register value */ | |
67 | stk1160_read_reg(dev, STK1160_AC97_CMD, &vall); | |
68 | stk1160_read_reg(dev, STK1160_AC97_CMD + 1, &valh); | |
69 | ||
70 | return (valh << 8) | vall; | |
71 | } | |
72 | ||
73 | static void stk1160_reset_ac97(struct snd_ac97 *ac97) | |
74 | { | |
75 | struct stk1160 *dev = ac97->private_data; | |
76 | /* Two-step reset AC97 interface and hardware codec */ | |
77 | stk1160_write_reg(dev, STK1160_AC97CTL_0, 0x94); | |
78 | stk1160_write_reg(dev, STK1160_AC97CTL_0, 0x88); | |
79 | ||
80 | /* Set 16-bit audio data and choose L&R channel*/ | |
81 | stk1160_write_reg(dev, STK1160_AC97CTL_1 + 2, 0x01); | |
82 | } | |
83 | ||
84 | static struct snd_ac97_bus_ops stk1160_ac97_ops = { | |
85 | .read = stk1160_read_ac97, | |
86 | .write = stk1160_write_ac97, | |
87 | .reset = stk1160_reset_ac97, | |
88 | }; | |
89 | ||
90 | int stk1160_ac97_register(struct stk1160 *dev) | |
91 | { | |
92 | struct snd_card *card = NULL; | |
93 | struct snd_ac97_bus *ac97_bus; | |
94 | struct snd_ac97_template ac97_template; | |
95 | int rc; | |
96 | ||
97 | /* | |
98 | * Just want a card to access ac96 controls, | |
99 | * the actual capture interface will be handled by snd-usb-audio | |
100 | */ | |
e7356888 TI |
101 | rc = snd_card_new(dev->dev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1, |
102 | THIS_MODULE, 0, &card); | |
9cb2173e EG |
103 | if (rc < 0) |
104 | return rc; | |
105 | ||
9cb2173e EG |
106 | /* TODO: I'm not sure where should I get these names :-( */ |
107 | snprintf(card->shortname, sizeof(card->shortname), | |
108 | "stk1160-mixer"); | |
109 | snprintf(card->longname, sizeof(card->longname), | |
110 | "stk1160 ac97 codec mixer control"); | |
9b2c06a4 | 111 | strlcpy(card->driver, dev->dev->driver->name, sizeof(card->driver)); |
9cb2173e EG |
112 | |
113 | rc = snd_ac97_bus(card, 0, &stk1160_ac97_ops, NULL, &ac97_bus); | |
114 | if (rc) | |
115 | goto err; | |
116 | ||
117 | /* We must set private_data before calling snd_ac97_mixer */ | |
118 | memset(&ac97_template, 0, sizeof(ac97_template)); | |
119 | ac97_template.private_data = dev; | |
120 | ac97_template.scaps = AC97_SCAP_SKIP_MODEM; | |
121 | rc = snd_ac97_mixer(ac97_bus, &ac97_template, &stk1160_ac97); | |
122 | if (rc) | |
123 | goto err; | |
124 | ||
125 | dev->snd_card = card; | |
126 | rc = snd_card_register(card); | |
127 | if (rc) | |
128 | goto err; | |
129 | ||
130 | return 0; | |
131 | ||
132 | err: | |
133 | dev->snd_card = NULL; | |
0590c713 | 134 | snd_card_free(card); |
9cb2173e EG |
135 | return rc; |
136 | } | |
137 | ||
138 | int stk1160_ac97_unregister(struct stk1160 *dev) | |
139 | { | |
140 | struct snd_card *card = dev->snd_card; | |
141 | ||
142 | /* | |
143 | * We need to check usb_device, | |
144 | * because ac97 release attempts to communicate with codec | |
145 | */ | |
146 | if (card && dev->udev) | |
147 | snd_card_free(card); | |
148 | ||
149 | return 0; | |
150 | } |