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1 | /* |
2 | * ALSA Driver for the PT2258 volume controller. |
3 | * |
4 | * Copyright (c) 2006 Jochen Voss <voss@seehuhn.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 | |
22 | #include <sound/core.h> |
23 | #include <sound/control.h> |
24 | #include <sound/tlv.h> |
25 | #include <sound/i2c.h> |
26 | #include <sound/pt2258.h> |
27 | #include <linux/module.h> |
28 | |
29 | MODULE_AUTHOR("Jochen Voss <voss@seehuhn.de>"); |
30 | MODULE_DESCRIPTION("PT2258 volume controller (Princeton Technology Corp.)"); |
31 | MODULE_LICENSE("GPL"); |
32 | |
33 | #define PT2258_CMD_RESET 0xc0 |
34 | #define PT2258_CMD_UNMUTE 0xf8 |
35 | #define PT2258_CMD_MUTE 0xf9 |
36 | |
37 | static const unsigned char pt2258_channel_code[12] = { |
38 | 0x80, 0x90, /* channel 1: -10dB, -1dB */ |
39 | 0x40, 0x50, /* channel 2: -10dB, -1dB */ |
40 | 0x00, 0x10, /* channel 3: -10dB, -1dB */ |
41 | 0x20, 0x30, /* channel 4: -10dB, -1dB */ |
42 | 0x60, 0x70, /* channel 5: -10dB, -1dB */ |
43 | 0xa0, 0xb0 /* channel 6: -10dB, -1dB */ |
44 | }; |
45 | |
46 | int snd_pt2258_reset(struct snd_pt2258 *pt) |
47 | { |
48 | unsigned char bytes[2]; |
49 | int i; |
50 | |
51 | /* reset chip */ |
52 | bytes[0] = PT2258_CMD_RESET; |
53 | snd_i2c_lock(pt->i2c_bus); |
54 | if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 1) != 1) |
55 | goto __error; |
56 | snd_i2c_unlock(pt->i2c_bus); |
57 | |
58 | /* mute all channels */ |
59 | pt->mute = 1; |
60 | bytes[0] = PT2258_CMD_MUTE; |
61 | snd_i2c_lock(pt->i2c_bus); |
62 | if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 1) != 1) |
63 | goto __error; |
64 | snd_i2c_unlock(pt->i2c_bus); |
65 | |
66 | /* set all channels to 0dB */ |
67 | for (i = 0; i < 6; ++i) |
68 | pt->volume[i] = 0; |
69 | bytes[0] = 0xd0; |
70 | bytes[1] = 0xe0; |
71 | snd_i2c_lock(pt->i2c_bus); |
72 | if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 2) != 2) |
73 | goto __error; |
74 | snd_i2c_unlock(pt->i2c_bus); |
75 | |
76 | return 0; |
77 | |
78 | __error: |
79 | snd_i2c_unlock(pt->i2c_bus); |
80 | snd_printk(KERN_ERR "PT2258 reset failed\n"); |
81 | return -EIO; |
82 | } |
83 | |
84 | static int pt2258_stereo_volume_info(struct snd_kcontrol *kcontrol, |
85 | struct snd_ctl_elem_info *uinfo) |
86 | { |
87 | uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; |
88 | uinfo->count = 2; |
89 | uinfo->value.integer.min = 0; |
90 | uinfo->value.integer.max = 79; |
91 | return 0; |
92 | } |
93 | |
94 | static int pt2258_stereo_volume_get(struct snd_kcontrol *kcontrol, |
95 | struct snd_ctl_elem_value *ucontrol) |
96 | { |
97 | struct snd_pt2258 *pt = kcontrol->private_data; |
98 | int base = kcontrol->private_value; |
99 | |
100 | /* chip does not support register reads */ |
101 | ucontrol->value.integer.value[0] = 79 - pt->volume[base]; |
102 | ucontrol->value.integer.value[1] = 79 - pt->volume[base + 1]; |
103 | return 0; |
104 | } |
105 | |
106 | static int pt2258_stereo_volume_put(struct snd_kcontrol *kcontrol, |
107 | struct snd_ctl_elem_value *ucontrol) |
108 | { |
109 | struct snd_pt2258 *pt = kcontrol->private_data; |
110 | int base = kcontrol->private_value; |
111 | unsigned char bytes[2]; |
112 | int val0, val1; |
113 | |
114 | val0 = 79 - ucontrol->value.integer.value[0]; |
115 | val1 = 79 - ucontrol->value.integer.value[1]; |
116 | if (val0 < 0 || val0 > 79 || val1 < 0 || val1 > 79) |
117 | return -EINVAL; |
118 | if (val0 == pt->volume[base] && val1 == pt->volume[base + 1]) |
119 | return 0; |
120 | |
121 | pt->volume[base] = val0; |
122 | bytes[0] = pt2258_channel_code[2 * base] | (val0 / 10); |
123 | bytes[1] = pt2258_channel_code[2 * base + 1] | (val0 % 10); |
124 | snd_i2c_lock(pt->i2c_bus); |
125 | if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 2) != 2) |
126 | goto __error; |
127 | snd_i2c_unlock(pt->i2c_bus); |
128 | |
129 | pt->volume[base + 1] = val1; |
130 | bytes[0] = pt2258_channel_code[2 * base + 2] | (val1 / 10); |
131 | bytes[1] = pt2258_channel_code[2 * base + 3] | (val1 % 10); |
132 | snd_i2c_lock(pt->i2c_bus); |
133 | if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 2) != 2) |
134 | goto __error; |
135 | snd_i2c_unlock(pt->i2c_bus); |
136 | |
137 | return 1; |
138 | |
139 | __error: |
140 | snd_i2c_unlock(pt->i2c_bus); |
141 | snd_printk(KERN_ERR "PT2258 access failed\n"); |
142 | return -EIO; |
143 | } |
144 | |
145 | #define pt2258_switch_info snd_ctl_boolean_mono_info |
146 | |
147 | static int pt2258_switch_get(struct snd_kcontrol *kcontrol, |
148 | struct snd_ctl_elem_value *ucontrol) |
149 | { |
150 | struct snd_pt2258 *pt = kcontrol->private_data; |
151 | |
152 | ucontrol->value.integer.value[0] = !pt->mute; |
153 | return 0; |
154 | } |
155 | |
156 | static int pt2258_switch_put(struct snd_kcontrol *kcontrol, |
157 | struct snd_ctl_elem_value *ucontrol) |
158 | { |
159 | struct snd_pt2258 *pt = kcontrol->private_data; |
160 | unsigned char bytes[2]; |
161 | int val; |
162 | |
163 | val = !ucontrol->value.integer.value[0]; |
164 | if (pt->mute == val) |
165 | return 0; |
166 | |
167 | pt->mute = val; |
168 | bytes[0] = val ? PT2258_CMD_MUTE : PT2258_CMD_UNMUTE; |
169 | snd_i2c_lock(pt->i2c_bus); |
170 | if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 1) != 1) |
171 | goto __error; |
172 | snd_i2c_unlock(pt->i2c_bus); |
173 | |
174 | return 1; |
175 | |
176 | __error: |
177 | snd_i2c_unlock(pt->i2c_bus); |
178 | snd_printk(KERN_ERR "PT2258 access failed 2\n"); |
179 | return -EIO; |
180 | } |
181 | |
182 | static const DECLARE_TLV_DB_SCALE(pt2258_db_scale, -7900, 100, 0); |
183 | |
184 | int snd_pt2258_build_controls(struct snd_pt2258 *pt) |
185 | { |
186 | struct snd_kcontrol_new knew; |
187 | char *names[3] = { |
188 | "Mic Loopback Playback Volume", |
189 | "Line Loopback Playback Volume", |
190 | "CD Loopback Playback Volume" |
191 | }; |
192 | int i, err; |
193 | |
194 | for (i = 0; i < 3; ++i) { |
195 | memset(&knew, 0, sizeof(knew)); |
196 | knew.name = names[i]; |
197 | knew.iface = SNDRV_CTL_ELEM_IFACE_MIXER; |
198 | knew.count = 1; |
199 | knew.access = SNDRV_CTL_ELEM_ACCESS_READWRITE | |
200 | SNDRV_CTL_ELEM_ACCESS_TLV_READ; |
201 | knew.private_value = 2 * i; |
202 | knew.info = pt2258_stereo_volume_info; |
203 | knew.get = pt2258_stereo_volume_get; |
204 | knew.put = pt2258_stereo_volume_put; |
205 | knew.tlv.p = pt2258_db_scale; |
206 | |
207 | err = snd_ctl_add(pt->card, snd_ctl_new1(&knew, pt)); |
208 | if (err < 0) |
209 | return err; |
210 | } |
211 | |
212 | memset(&knew, 0, sizeof(knew)); |
213 | knew.name = "Loopback Switch"; |
214 | knew.iface = SNDRV_CTL_ELEM_IFACE_MIXER; |
215 | knew.info = pt2258_switch_info; |
216 | knew.get = pt2258_switch_get; |
217 | knew.put = pt2258_switch_put; |
218 | knew.access = 0; |
219 | err = snd_ctl_add(pt->card, snd_ctl_new1(&knew, pt)); |
220 | if (err < 0) |
221 | return err; |
222 | |
223 | return 0; |
224 | } |
225 | |
226 | EXPORT_SYMBOL(snd_pt2258_reset); |
227 | EXPORT_SYMBOL(snd_pt2258_build_controls); |
228 |
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