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[/] [or1k_soc_on_altera_embedded_dev_kit/] [trunk/] [linux-2.6/] [linux-2.6.24/] [sound/] [i2c/] [other/] [pt2258.c] - Rev 17
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/* * ALSA Driver for the PT2258 volume controller. * * Copyright (c) 2006 Jochen Voss <voss@seehuhn.de> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * */ #include <sound/driver.h> #include <sound/core.h> #include <sound/control.h> #include <sound/tlv.h> #include <sound/i2c.h> #include <sound/pt2258.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 == 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);
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