1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * ALSA Driver for the PT2258 volume controller. |
4 | * |
5 | * Copyright (c) 2006 Jochen Voss <voss@seehuhn.de> |
6 | */ |
7 | |
8 | #include <sound/core.h> |
9 | #include <sound/control.h> |
10 | #include <sound/tlv.h> |
11 | #include <sound/i2c.h> |
12 | #include <sound/pt2258.h> |
13 | #include <linux/module.h> |
14 | |
15 | MODULE_AUTHOR("Jochen Voss <voss@seehuhn.de>" ); |
16 | MODULE_DESCRIPTION("PT2258 volume controller (Princeton Technology Corp.)" ); |
17 | MODULE_LICENSE("GPL" ); |
18 | |
19 | #define PT2258_CMD_RESET 0xc0 |
20 | #define PT2258_CMD_UNMUTE 0xf8 |
21 | #define PT2258_CMD_MUTE 0xf9 |
22 | |
23 | static const unsigned char pt2258_channel_code[12] = { |
24 | 0x80, 0x90, /* channel 1: -10dB, -1dB */ |
25 | 0x40, 0x50, /* channel 2: -10dB, -1dB */ |
26 | 0x00, 0x10, /* channel 3: -10dB, -1dB */ |
27 | 0x20, 0x30, /* channel 4: -10dB, -1dB */ |
28 | 0x60, 0x70, /* channel 5: -10dB, -1dB */ |
29 | 0xa0, 0xb0 /* channel 6: -10dB, -1dB */ |
30 | }; |
31 | |
32 | int snd_pt2258_reset(struct snd_pt2258 *pt) |
33 | { |
34 | unsigned char bytes[2]; |
35 | int i; |
36 | |
37 | /* reset chip */ |
38 | bytes[0] = PT2258_CMD_RESET; |
39 | snd_i2c_lock(bus: pt->i2c_bus); |
40 | if (snd_i2c_sendbytes(device: pt->i2c_dev, bytes, count: 1) != 1) |
41 | goto __error; |
42 | snd_i2c_unlock(bus: pt->i2c_bus); |
43 | |
44 | /* mute all channels */ |
45 | pt->mute = 1; |
46 | bytes[0] = PT2258_CMD_MUTE; |
47 | snd_i2c_lock(bus: pt->i2c_bus); |
48 | if (snd_i2c_sendbytes(device: pt->i2c_dev, bytes, count: 1) != 1) |
49 | goto __error; |
50 | snd_i2c_unlock(bus: pt->i2c_bus); |
51 | |
52 | /* set all channels to 0dB */ |
53 | for (i = 0; i < 6; ++i) |
54 | pt->volume[i] = 0; |
55 | bytes[0] = 0xd0; |
56 | bytes[1] = 0xe0; |
57 | snd_i2c_lock(bus: pt->i2c_bus); |
58 | if (snd_i2c_sendbytes(device: pt->i2c_dev, bytes, count: 2) != 2) |
59 | goto __error; |
60 | snd_i2c_unlock(bus: pt->i2c_bus); |
61 | |
62 | return 0; |
63 | |
64 | __error: |
65 | snd_i2c_unlock(bus: pt->i2c_bus); |
66 | snd_printk(KERN_ERR "PT2258 reset failed\n" ); |
67 | return -EIO; |
68 | } |
69 | |
70 | static int pt2258_stereo_volume_info(struct snd_kcontrol *kcontrol, |
71 | struct snd_ctl_elem_info *uinfo) |
72 | { |
73 | uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; |
74 | uinfo->count = 2; |
75 | uinfo->value.integer.min = 0; |
76 | uinfo->value.integer.max = 79; |
77 | return 0; |
78 | } |
79 | |
80 | static int pt2258_stereo_volume_get(struct snd_kcontrol *kcontrol, |
81 | struct snd_ctl_elem_value *ucontrol) |
82 | { |
83 | struct snd_pt2258 *pt = kcontrol->private_data; |
84 | int base = kcontrol->private_value; |
85 | |
86 | /* chip does not support register reads */ |
87 | ucontrol->value.integer.value[0] = 79 - pt->volume[base]; |
88 | ucontrol->value.integer.value[1] = 79 - pt->volume[base + 1]; |
89 | return 0; |
90 | } |
91 | |
92 | static int pt2258_stereo_volume_put(struct snd_kcontrol *kcontrol, |
93 | struct snd_ctl_elem_value *ucontrol) |
94 | { |
95 | struct snd_pt2258 *pt = kcontrol->private_data; |
96 | int base = kcontrol->private_value; |
97 | unsigned char bytes[2]; |
98 | int val0, val1; |
99 | |
100 | val0 = 79 - ucontrol->value.integer.value[0]; |
101 | val1 = 79 - ucontrol->value.integer.value[1]; |
102 | if (val0 < 0 || val0 > 79 || val1 < 0 || val1 > 79) |
103 | return -EINVAL; |
104 | if (val0 == pt->volume[base] && val1 == pt->volume[base + 1]) |
105 | return 0; |
106 | |
107 | pt->volume[base] = val0; |
108 | bytes[0] = pt2258_channel_code[2 * base] | (val0 / 10); |
109 | bytes[1] = pt2258_channel_code[2 * base + 1] | (val0 % 10); |
110 | snd_i2c_lock(bus: pt->i2c_bus); |
111 | if (snd_i2c_sendbytes(device: pt->i2c_dev, bytes, count: 2) != 2) |
112 | goto __error; |
113 | snd_i2c_unlock(bus: pt->i2c_bus); |
114 | |
115 | pt->volume[base + 1] = val1; |
116 | bytes[0] = pt2258_channel_code[2 * base + 2] | (val1 / 10); |
117 | bytes[1] = pt2258_channel_code[2 * base + 3] | (val1 % 10); |
118 | snd_i2c_lock(bus: pt->i2c_bus); |
119 | if (snd_i2c_sendbytes(device: pt->i2c_dev, bytes, count: 2) != 2) |
120 | goto __error; |
121 | snd_i2c_unlock(bus: pt->i2c_bus); |
122 | |
123 | return 1; |
124 | |
125 | __error: |
126 | snd_i2c_unlock(bus: pt->i2c_bus); |
127 | snd_printk(KERN_ERR "PT2258 access failed\n" ); |
128 | return -EIO; |
129 | } |
130 | |
131 | #define pt2258_switch_info snd_ctl_boolean_mono_info |
132 | |
133 | static int pt2258_switch_get(struct snd_kcontrol *kcontrol, |
134 | struct snd_ctl_elem_value *ucontrol) |
135 | { |
136 | struct snd_pt2258 *pt = kcontrol->private_data; |
137 | |
138 | ucontrol->value.integer.value[0] = !pt->mute; |
139 | return 0; |
140 | } |
141 | |
142 | static int pt2258_switch_put(struct snd_kcontrol *kcontrol, |
143 | struct snd_ctl_elem_value *ucontrol) |
144 | { |
145 | struct snd_pt2258 *pt = kcontrol->private_data; |
146 | unsigned char bytes[2]; |
147 | int val; |
148 | |
149 | val = !ucontrol->value.integer.value[0]; |
150 | if (pt->mute == val) |
151 | return 0; |
152 | |
153 | pt->mute = val; |
154 | bytes[0] = val ? PT2258_CMD_MUTE : PT2258_CMD_UNMUTE; |
155 | snd_i2c_lock(bus: pt->i2c_bus); |
156 | if (snd_i2c_sendbytes(device: pt->i2c_dev, bytes, count: 1) != 1) |
157 | goto __error; |
158 | snd_i2c_unlock(bus: pt->i2c_bus); |
159 | |
160 | return 1; |
161 | |
162 | __error: |
163 | snd_i2c_unlock(bus: pt->i2c_bus); |
164 | snd_printk(KERN_ERR "PT2258 access failed 2\n" ); |
165 | return -EIO; |
166 | } |
167 | |
168 | static const DECLARE_TLV_DB_SCALE(pt2258_db_scale, -7900, 100, 0); |
169 | |
170 | int snd_pt2258_build_controls(struct snd_pt2258 *pt) |
171 | { |
172 | struct snd_kcontrol_new knew; |
173 | char *names[3] = { |
174 | "Mic Loopback Playback Volume" , |
175 | "Line Loopback Playback Volume" , |
176 | "CD Loopback Playback Volume" |
177 | }; |
178 | int i, err; |
179 | |
180 | for (i = 0; i < 3; ++i) { |
181 | memset(&knew, 0, sizeof(knew)); |
182 | knew.name = names[i]; |
183 | knew.iface = SNDRV_CTL_ELEM_IFACE_MIXER; |
184 | knew.count = 1; |
185 | knew.access = SNDRV_CTL_ELEM_ACCESS_READWRITE | |
186 | SNDRV_CTL_ELEM_ACCESS_TLV_READ; |
187 | knew.private_value = 2 * i; |
188 | knew.info = pt2258_stereo_volume_info; |
189 | knew.get = pt2258_stereo_volume_get; |
190 | knew.put = pt2258_stereo_volume_put; |
191 | knew.tlv.p = pt2258_db_scale; |
192 | |
193 | err = snd_ctl_add(card: pt->card, kcontrol: snd_ctl_new1(kcontrolnew: &knew, private_data: pt)); |
194 | if (err < 0) |
195 | return err; |
196 | } |
197 | |
198 | memset(&knew, 0, sizeof(knew)); |
199 | knew.name = "Loopback Switch" ; |
200 | knew.iface = SNDRV_CTL_ELEM_IFACE_MIXER; |
201 | knew.info = pt2258_switch_info; |
202 | knew.get = pt2258_switch_get; |
203 | knew.put = pt2258_switch_put; |
204 | knew.access = 0; |
205 | err = snd_ctl_add(card: pt->card, kcontrol: snd_ctl_new1(kcontrolnew: &knew, private_data: pt)); |
206 | if (err < 0) |
207 | return err; |
208 | |
209 | return 0; |
210 | } |
211 | |
212 | EXPORT_SYMBOL(snd_pt2258_reset); |
213 | EXPORT_SYMBOL(snd_pt2258_build_controls); |
214 | |