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
29MODULE_AUTHOR("Jochen Voss <voss@seehuhn.de>");
30MODULE_DESCRIPTION("PT2258 volume controller (Princeton Technology Corp.)");
31MODULE_LICENSE("GPL");
32
33#define PT2258_CMD_RESET 0xc0
34#define PT2258_CMD_UNMUTE 0xf8
35#define PT2258_CMD_MUTE 0xf9
36
37static 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
46int 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
84static 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
94static 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
106static 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
147static 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
156static 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
182static const DECLARE_TLV_DB_SCALE(pt2258_db_scale, -7900, 100, 0);
183
184int 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
226EXPORT_SYMBOL(snd_pt2258_reset);
227EXPORT_SYMBOL(snd_pt2258_build_controls);
228