summaryrefslogtreecommitdiff
path: root/sound/i2c/other/pt2258.c
blob: c913f223892ac065f29524f805663e499be390b9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *   ALSA Driver for the PT2258 volume controller.
 *
 *	Copyright (c) 2006  Jochen Voss <voss@seehuhn.de>
 */      

#include <sound/core.h>
#include <sound/control.h>
#include <sound/tlv.h>
#include <sound/i2c.h>
#include <sound/pt2258.h>
#include <linux/module.h>

MODULE_AUTHOR("Jochen Voss <voss@seehuhn.de>");
MODULE_DESCRIPTION("PT2258 volume controller (Princeton Technology Corp.)");
MODULE_LICENSE("GPL");

#define PT2258_CMD_RESET 0xc0
#define PT2258_CMD_UNMUTE 0xf8
#define PT2258_CMD_MUTE 0xf9

static const unsigned char pt2258_channel_code[12] = {
	0x80, 0x90,		/* channel 1: -10dB, -1dB */
	0x40, 0x50,		/* channel 2: -10dB, -1dB */
	0x00, 0x10,		/* channel 3: -10dB, -1dB */
	0x20, 0x30,		/* channel 4: -10dB, -1dB */
	0x60, 0x70,		/* channel 5: -10dB, -1dB */
	0xa0, 0xb0		/* channel 6: -10dB, -1dB */
};

int snd_pt2258_reset(struct snd_pt2258 *pt)
{
	unsigned char bytes[2];
	int i;

	/* reset chip */
	bytes[0] = PT2258_CMD_RESET;
	snd_i2c_lock(pt->i2c_bus);
	if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 1) != 1)
		goto __error;
	snd_i2c_unlock(pt->i2c_bus);

	/* mute all channels */
	pt->mute = 1;
	bytes[0] = PT2258_CMD_MUTE;
	snd_i2c_lock(pt->i2c_bus);
	if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 1) != 1)
		goto __error;
	snd_i2c_unlock(pt->i2c_bus);

	/* set all channels to 0dB */
	for (i = 0; i < 6; ++i)
		pt->volume[i] = 0;
	bytes[0] = 0xd0;
	bytes[1] = 0xe0;
	snd_i2c_lock(pt->i2c_bus);
	if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 2) != 2)
		goto __error;
	snd_i2c_unlock(pt->i2c_bus);

	return 0;

      __error:
	snd_i2c_unlock(pt->i2c_bus);
	snd_printk(KERN_ERR "PT2258 reset failed\n");
	return -EIO;
}

static int pt2258_stereo_volume_info(struct snd_kcontrol *kcontrol,
				     struct snd_ctl_elem_info *uinfo)
{
	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
	uinfo->count = 2;
	uinfo->value.integer.min = 0;
	uinfo->value.integer.max = 79;
	return 0;
}

static int pt2258_stereo_volume_get(struct snd_kcontrol *kcontrol,
				    struct snd_ctl_elem_value *ucontrol)
{
	struct snd_pt2258 *pt = kcontrol->private_data;
	int base = kcontrol->private_value;

	/* chip does not support register reads */
	ucontrol->value.integer.value[0] = 79 - pt->volume[base];
	ucontrol->value.integer.value[1] = 79 - pt->volume[base + 1];
	return 0;
}

static int pt2258_stereo_volume_put(struct snd_kcontrol *kcontrol,
				    struct snd_ctl_elem_value *ucontrol)
{
	struct snd_pt2258 *pt = kcontrol->private_data;
	int base = kcontrol->private_value;
	unsigned char bytes[2];
	int val0, val1;

	val0 = 79 - ucontrol->value.integer.value[0];
	val1 = 79 - ucontrol->value.integer.value[1];
	if (val0 < 0 || val0 > 79 || val1 < 0 || val1 > 79)
		return -EINVAL;
	if (val0 == pt->volume[base] && val1 == pt->volume[base + 1])
		return 0;

	pt->volume[base] = val0;
	bytes[0] = pt2258_channel_code[2 * base] | (val0 / 10);
	bytes[1] = pt2258_channel_code[2 * base + 1] | (val0 % 10);
	snd_i2c_lock(pt->i2c_bus);
	if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 2) != 2)
		goto __error;
	snd_i2c_unlock(pt->i2c_bus);

	pt->volume[base + 1] = val1;
	bytes[0] = pt2258_channel_code[2 * base + 2] | (val1 / 10);
	bytes[1] = pt2258_channel_code[2 * base + 3] | (val1 % 10);
	snd_i2c_lock(pt->i2c_bus);
	if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 2) != 2)
		goto __error;
	snd_i2c_unlock(pt->i2c_bus);

	return 1;

      __error:
	snd_i2c_unlock(pt->i2c_bus);
	snd_printk(KERN_ERR "PT2258 access failed\n");
	return -EIO;
}

#define pt2258_switch_info	snd_ctl_boolean_mono_info

static int pt2258_switch_get(struct snd_kcontrol *kcontrol,
			     struct snd_ctl_elem_value *ucontrol)
{
	struct snd_pt2258 *pt = kcontrol->private_data;

	ucontrol->value.integer.value[0] = !pt->mute;
	return 0;
}

static int pt2258_switch_put(struct snd_kcontrol *kcontrol,
			     struct snd_ctl_elem_value *ucontrol)
{
	struct snd_pt2258 *pt = kcontrol->private_data;
	unsigned char bytes[2];
	int val;

	val = !ucontrol->value.integer.value[0];
	if (pt->mute == val)
		return 0;

	pt->mute = val;
	bytes[0] = val ? PT2258_CMD_MUTE : PT2258_CMD_UNMUTE;
	snd_i2c_lock(pt->i2c_bus);
	if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 1) != 1)
		goto __error;
	snd_i2c_unlock(pt->i2c_bus);

	return 1;

      __error:
	snd_i2c_unlock(pt->i2c_bus);
	snd_printk(KERN_ERR "PT2258 access failed 2\n");
	return -EIO;
}

static const DECLARE_TLV_DB_SCALE(pt2258_db_scale, -7900, 100, 0);

int snd_pt2258_build_controls(struct snd_pt2258 *pt)
{
	struct snd_kcontrol_new knew;
	char *names[3] = {
		"Mic Loopback Playback Volume",
		"Line Loopback Playback Volume",
		"CD Loopback Playback Volume"
	};
	int i, err;

	for (i = 0; i < 3; ++i) {
		memset(&knew, 0, sizeof(knew));
		knew.name = names[i];
		knew.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
		knew.count = 1;
		knew.access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
		    SNDRV_CTL_ELEM_ACCESS_TLV_READ;
		knew.private_value = 2 * i;
		knew.info = pt2258_stereo_volume_info;
		knew.get = pt2258_stereo_volume_get;
		knew.put = pt2258_stereo_volume_put;
		knew.tlv.p = pt2258_db_scale;

		err = snd_ctl_add(pt->card, snd_ctl_new1(&knew, pt));
		if (err < 0)
			return err;
	}

	memset(&knew, 0, sizeof(knew));
	knew.name = "Loopback Switch";
	knew.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
	knew.info = pt2258_switch_info;
	knew.get = pt2258_switch_get;
	knew.put = pt2258_switch_put;
	knew.access = 0;
	err = snd_ctl_add(pt->card, snd_ctl_new1(&knew, pt));
	if (err < 0)
		return err;

	return 0;
}

EXPORT_SYMBOL(snd_pt2258_reset);
EXPORT_SYMBOL(snd_pt2258_build_controls);