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
15MODULE_AUTHOR("Jochen Voss <voss@seehuhn.de>");
16MODULE_DESCRIPTION("PT2258 volume controller (Princeton Technology Corp.)");
17MODULE_LICENSE("GPL");
18
19#define PT2258_CMD_RESET 0xc0
20#define PT2258_CMD_UNMUTE 0xf8
21#define PT2258_CMD_MUTE 0xf9
22
23static 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
32int 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(pt->i2c_bus);
40	if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 1) != 1)
41		goto __error;
42	snd_i2c_unlock(pt->i2c_bus);
43
44	/* mute all channels */
45	pt->mute = 1;
46	bytes[0] = PT2258_CMD_MUTE;
47	snd_i2c_lock(pt->i2c_bus);
48	if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 1) != 1)
49		goto __error;
50	snd_i2c_unlock(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(pt->i2c_bus);
58	if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 2) != 2)
59		goto __error;
60	snd_i2c_unlock(pt->i2c_bus);
61
62	return 0;
63
64      __error:
65	snd_i2c_unlock(pt->i2c_bus);
66	snd_printk(KERN_ERR "PT2258 reset failed\n");
67	return -EIO;
68}
69
70static 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
80static 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
92static 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(pt->i2c_bus);
111	if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 2) != 2)
112		goto __error;
113	snd_i2c_unlock(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(pt->i2c_bus);
119	if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 2) != 2)
120		goto __error;
121	snd_i2c_unlock(pt->i2c_bus);
122
123	return 1;
124
125      __error:
126	snd_i2c_unlock(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
133static 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
142static 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(pt->i2c_bus);
156	if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 1) != 1)
157		goto __error;
158	snd_i2c_unlock(pt->i2c_bus);
159
160	return 1;
161
162      __error:
163	snd_i2c_unlock(pt->i2c_bus);
164	snd_printk(KERN_ERR "PT2258 access failed 2\n");
165	return -EIO;
166}
167
168static const DECLARE_TLV_DB_SCALE(pt2258_db_scale, -7900, 100, 0);
169
170int 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(pt->card, snd_ctl_new1(&knew, 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(pt->card, snd_ctl_new1(&knew, pt));
206	if (err < 0)
207		return err;
208
209	return 0;
210}
211
212EXPORT_SYMBOL(snd_pt2258_reset);
213EXPORT_SYMBOL(snd_pt2258_build_controls);
214