228 lines
6.1 KiB
C
228 lines
6.1 KiB
C
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/*
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* ALSA Driver for the PT2258 volume controller.
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*
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* Copyright (c) 2006 Jochen Voss <voss@seehuhn.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <sound/core.h>
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#include <sound/control.h>
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#include <sound/tlv.h>
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#include <sound/i2c.h>
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#include <sound/pt2258.h>
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#include <linux/module.h>
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MODULE_AUTHOR("Jochen Voss <voss@seehuhn.de>");
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MODULE_DESCRIPTION("PT2258 volume controller (Princeton Technology Corp.)");
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MODULE_LICENSE("GPL");
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#define PT2258_CMD_RESET 0xc0
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#define PT2258_CMD_UNMUTE 0xf8
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#define PT2258_CMD_MUTE 0xf9
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static const unsigned char pt2258_channel_code[12] = {
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0x80, 0x90, /* channel 1: -10dB, -1dB */
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0x40, 0x50, /* channel 2: -10dB, -1dB */
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0x00, 0x10, /* channel 3: -10dB, -1dB */
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0x20, 0x30, /* channel 4: -10dB, -1dB */
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0x60, 0x70, /* channel 5: -10dB, -1dB */
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0xa0, 0xb0 /* channel 6: -10dB, -1dB */
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};
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int snd_pt2258_reset(struct snd_pt2258 *pt)
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{
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unsigned char bytes[2];
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int i;
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/* reset chip */
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bytes[0] = PT2258_CMD_RESET;
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snd_i2c_lock(pt->i2c_bus);
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if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 1) != 1)
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goto __error;
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snd_i2c_unlock(pt->i2c_bus);
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/* mute all channels */
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pt->mute = 1;
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bytes[0] = PT2258_CMD_MUTE;
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snd_i2c_lock(pt->i2c_bus);
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if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 1) != 1)
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goto __error;
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snd_i2c_unlock(pt->i2c_bus);
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/* set all channels to 0dB */
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for (i = 0; i < 6; ++i)
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pt->volume[i] = 0;
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bytes[0] = 0xd0;
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bytes[1] = 0xe0;
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snd_i2c_lock(pt->i2c_bus);
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if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 2) != 2)
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goto __error;
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snd_i2c_unlock(pt->i2c_bus);
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return 0;
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__error:
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snd_i2c_unlock(pt->i2c_bus);
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snd_printk(KERN_ERR "PT2258 reset failed\n");
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return -EIO;
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}
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static int pt2258_stereo_volume_info(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_info *uinfo)
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{
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uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
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uinfo->count = 2;
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uinfo->value.integer.min = 0;
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uinfo->value.integer.max = 79;
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return 0;
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}
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static int pt2258_stereo_volume_get(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_value *ucontrol)
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{
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struct snd_pt2258 *pt = kcontrol->private_data;
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int base = kcontrol->private_value;
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/* chip does not support register reads */
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ucontrol->value.integer.value[0] = 79 - pt->volume[base];
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ucontrol->value.integer.value[1] = 79 - pt->volume[base + 1];
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return 0;
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}
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static int pt2258_stereo_volume_put(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_value *ucontrol)
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{
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struct snd_pt2258 *pt = kcontrol->private_data;
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int base = kcontrol->private_value;
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unsigned char bytes[2];
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int val0, val1;
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val0 = 79 - ucontrol->value.integer.value[0];
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val1 = 79 - ucontrol->value.integer.value[1];
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if (val0 < 0 || val0 > 79 || val1 < 0 || val1 > 79)
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return -EINVAL;
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if (val0 == pt->volume[base] && val1 == pt->volume[base + 1])
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return 0;
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pt->volume[base] = val0;
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bytes[0] = pt2258_channel_code[2 * base] | (val0 / 10);
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bytes[1] = pt2258_channel_code[2 * base + 1] | (val0 % 10);
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snd_i2c_lock(pt->i2c_bus);
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if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 2) != 2)
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goto __error;
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snd_i2c_unlock(pt->i2c_bus);
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pt->volume[base + 1] = val1;
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bytes[0] = pt2258_channel_code[2 * base + 2] | (val1 / 10);
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bytes[1] = pt2258_channel_code[2 * base + 3] | (val1 % 10);
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snd_i2c_lock(pt->i2c_bus);
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if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 2) != 2)
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goto __error;
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snd_i2c_unlock(pt->i2c_bus);
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return 1;
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__error:
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snd_i2c_unlock(pt->i2c_bus);
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snd_printk(KERN_ERR "PT2258 access failed\n");
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return -EIO;
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}
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#define pt2258_switch_info snd_ctl_boolean_mono_info
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static int pt2258_switch_get(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_value *ucontrol)
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{
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struct snd_pt2258 *pt = kcontrol->private_data;
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ucontrol->value.integer.value[0] = !pt->mute;
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return 0;
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}
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static int pt2258_switch_put(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_value *ucontrol)
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{
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struct snd_pt2258 *pt = kcontrol->private_data;
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unsigned char bytes[2];
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int val;
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val = !ucontrol->value.integer.value[0];
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if (pt->mute == val)
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return 0;
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pt->mute = val;
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bytes[0] = val ? PT2258_CMD_MUTE : PT2258_CMD_UNMUTE;
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snd_i2c_lock(pt->i2c_bus);
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if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 1) != 1)
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goto __error;
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snd_i2c_unlock(pt->i2c_bus);
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return 1;
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__error:
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snd_i2c_unlock(pt->i2c_bus);
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snd_printk(KERN_ERR "PT2258 access failed 2\n");
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return -EIO;
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}
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static const DECLARE_TLV_DB_SCALE(pt2258_db_scale, -7900, 100, 0);
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int snd_pt2258_build_controls(struct snd_pt2258 *pt)
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{
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struct snd_kcontrol_new knew;
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char *names[3] = {
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"Mic Loopback Playback Volume",
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"Line Loopback Playback Volume",
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"CD Loopback Playback Volume"
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};
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int i, err;
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for (i = 0; i < 3; ++i) {
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memset(&knew, 0, sizeof(knew));
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knew.name = names[i];
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knew.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
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knew.count = 1;
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knew.access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
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SNDRV_CTL_ELEM_ACCESS_TLV_READ;
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knew.private_value = 2 * i;
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knew.info = pt2258_stereo_volume_info;
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knew.get = pt2258_stereo_volume_get;
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knew.put = pt2258_stereo_volume_put;
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knew.tlv.p = pt2258_db_scale;
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err = snd_ctl_add(pt->card, snd_ctl_new1(&knew, pt));
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if (err < 0)
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return err;
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}
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memset(&knew, 0, sizeof(knew));
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knew.name = "Loopback Switch";
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knew.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
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knew.info = pt2258_switch_info;
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knew.get = pt2258_switch_get;
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knew.put = pt2258_switch_put;
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knew.access = 0;
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err = snd_ctl_add(pt->card, snd_ctl_new1(&knew, pt));
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if (err < 0)
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return err;
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return 0;
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}
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EXPORT_SYMBOL(snd_pt2258_reset);
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EXPORT_SYMBOL(snd_pt2258_build_controls);
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