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control.c

/*
 * Linux driver for TerraTec DMX 6Fire USB
 *
 * Mixer control
 *
 * Author:  Torsten Schenk <torsten.schenk@zoho.com>
 * Created: Jan 01, 2011
 * Version: 0.3.0
 * Copyright:     (C) Torsten Schenk
 *
 * 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.
 */

#include <linux/interrupt.h>
#include <sound/control.h>

#include "control.h"
#include "comm.h"
#include "chip.h"

static char *opt_coax_texts[2] = { "Optical", "Coax" };
static char *line_phono_texts[2] = { "Line", "Phono" };

/*
 * calculated with $value\[i\] = 128 \cdot sqrt[3]{\frac{i}{128}}$
 * this is done because the linear values cause rapid degredation
 * of volume in the uppermost region.
 */
static const u8 log_volume_table[128] = {
      0x00, 0x19, 0x20, 0x24, 0x28, 0x2b, 0x2e, 0x30, 0x32, 0x34,
      0x36, 0x38, 0x3a, 0x3b, 0x3d, 0x3e, 0x40, 0x41, 0x42, 0x43,
      0x44, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e,
      0x4e, 0x4f, 0x50, 0x51, 0x52, 0x53, 0x53, 0x54, 0x55, 0x56,
      0x56, 0x57, 0x58, 0x58, 0x59, 0x5a, 0x5b, 0x5b, 0x5c, 0x5c,
      0x5d, 0x5e, 0x5e, 0x5f, 0x60, 0x60, 0x61, 0x61, 0x62, 0x62,
      0x63, 0x63, 0x64, 0x65, 0x65, 0x66, 0x66, 0x67, 0x67, 0x68,
      0x68, 0x69, 0x69, 0x6a, 0x6a, 0x6b, 0x6b, 0x6c, 0x6c, 0x6c,
      0x6d, 0x6d, 0x6e, 0x6e, 0x6f, 0x6f, 0x70, 0x70, 0x70, 0x71,
      0x71, 0x72, 0x72, 0x73, 0x73, 0x73, 0x74, 0x74, 0x75, 0x75,
      0x75, 0x76, 0x76, 0x77, 0x77, 0x77, 0x78, 0x78, 0x78, 0x79,
      0x79, 0x7a, 0x7a, 0x7a, 0x7b, 0x7b, 0x7b, 0x7c, 0x7c, 0x7c,
      0x7d, 0x7d, 0x7d, 0x7e, 0x7e, 0x7e, 0x7f, 0x7f };

/*
 * data that needs to be sent to device. sets up card internal stuff.
 * values dumped from windows driver and filtered by trial'n'error.
 */
static const struct {
      u8 type;
      u8 reg;
      u8 value;
}
init_data[] = {
      { 0x22, 0x00, 0x00 }, { 0x20, 0x00, 0x08 }, { 0x22, 0x01, 0x01 },
      { 0x20, 0x01, 0x08 }, { 0x22, 0x02, 0x00 }, { 0x20, 0x02, 0x08 },
      { 0x22, 0x03, 0x00 }, { 0x20, 0x03, 0x08 }, { 0x22, 0x04, 0x00 },
      { 0x20, 0x04, 0x08 }, { 0x22, 0x05, 0x01 }, { 0x20, 0x05, 0x08 },
      { 0x22, 0x04, 0x01 }, { 0x12, 0x04, 0x00 }, { 0x12, 0x05, 0x00 },
      { 0x12, 0x0d, 0x78 }, { 0x12, 0x21, 0x82 }, { 0x12, 0x22, 0x80 },
      { 0x12, 0x23, 0x00 }, { 0x12, 0x06, 0x02 }, { 0x12, 0x03, 0x00 },
      { 0x12, 0x02, 0x00 }, { 0x22, 0x03, 0x01 },
      { 0 } /* TERMINATING ENTRY */
};

static void usb6fire_control_master_vol_update(struct control_runtime *rt)
{
      struct comm_runtime *comm_rt = rt->chip->comm;
      if (comm_rt) {
            /* set volume */
            comm_rt->write8(comm_rt, 0x12, 0x0f, 0x7f -
                        log_volume_table[rt->master_vol]);
             /* unmute */
            comm_rt->write8(comm_rt, 0x12, 0x0e, 0x00);
      }
}

static void usb6fire_control_line_phono_update(struct control_runtime *rt)
{
      struct comm_runtime *comm_rt = rt->chip->comm;
      if (comm_rt) {
            comm_rt->write8(comm_rt, 0x22, 0x02, rt->line_phono_switch);
            comm_rt->write8(comm_rt, 0x21, 0x02, rt->line_phono_switch);
      }
}

static void usb6fire_control_opt_coax_update(struct control_runtime *rt)
{
      struct comm_runtime *comm_rt = rt->chip->comm;
      if (comm_rt) {
            comm_rt->write8(comm_rt, 0x22, 0x00, rt->opt_coax_switch);
            comm_rt->write8(comm_rt, 0x21, 0x00, rt->opt_coax_switch);
      }
}

static int usb6fire_control_master_vol_info(struct snd_kcontrol *kcontrol,
            struct snd_ctl_elem_info *uinfo)
{
      uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
      uinfo->count = 1;
      uinfo->value.integer.min = 0;
      uinfo->value.integer.max = 127;
      return 0;
}

static int usb6fire_control_master_vol_put(struct snd_kcontrol *kcontrol,
            struct snd_ctl_elem_value *ucontrol)
{
      struct control_runtime *rt = snd_kcontrol_chip(kcontrol);
      int changed = 0;
      if (rt->master_vol != ucontrol->value.integer.value[0]) {
            rt->master_vol = ucontrol->value.integer.value[0];
            usb6fire_control_master_vol_update(rt);
            changed = 1;
      }
      return changed;
}

static int usb6fire_control_master_vol_get(struct snd_kcontrol *kcontrol,
            struct snd_ctl_elem_value *ucontrol)
{
      struct control_runtime *rt = snd_kcontrol_chip(kcontrol);
      ucontrol->value.integer.value[0] = rt->master_vol;
      return 0;
}

static int usb6fire_control_line_phono_info(struct snd_kcontrol *kcontrol,
            struct snd_ctl_elem_info *uinfo)
{
      uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
      uinfo->count = 1;
      uinfo->value.enumerated.items = 2;
      if (uinfo->value.enumerated.item > 1)
            uinfo->value.enumerated.item = 1;
      strcpy(uinfo->value.enumerated.name,
                  line_phono_texts[uinfo->value.enumerated.item]);
      return 0;
}

static int usb6fire_control_line_phono_put(struct snd_kcontrol *kcontrol,
            struct snd_ctl_elem_value *ucontrol)
{
      struct control_runtime *rt = snd_kcontrol_chip(kcontrol);
      int changed = 0;
      if (rt->line_phono_switch != ucontrol->value.integer.value[0]) {
            rt->line_phono_switch = ucontrol->value.integer.value[0];
            usb6fire_control_line_phono_update(rt);
            changed = 1;
      }
      return changed;
}

static int usb6fire_control_line_phono_get(struct snd_kcontrol *kcontrol,
            struct snd_ctl_elem_value *ucontrol)
{
      struct control_runtime *rt = snd_kcontrol_chip(kcontrol);
      ucontrol->value.integer.value[0] = rt->line_phono_switch;
      return 0;
}

static int usb6fire_control_opt_coax_info(struct snd_kcontrol *kcontrol,
            struct snd_ctl_elem_info *uinfo)
{
      uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
      uinfo->count = 1;
      uinfo->value.enumerated.items = 2;
      if (uinfo->value.enumerated.item > 1)
            uinfo->value.enumerated.item = 1;
      strcpy(uinfo->value.enumerated.name,
                  opt_coax_texts[uinfo->value.enumerated.item]);
      return 0;
}

static int usb6fire_control_opt_coax_put(struct snd_kcontrol *kcontrol,
            struct snd_ctl_elem_value *ucontrol)
{
      struct control_runtime *rt = snd_kcontrol_chip(kcontrol);
      int changed = 0;

      if (rt->opt_coax_switch != ucontrol->value.enumerated.item[0]) {
            rt->opt_coax_switch = ucontrol->value.enumerated.item[0];
            usb6fire_control_opt_coax_update(rt);
            changed = 1;
      }
      return changed;
}

static int usb6fire_control_opt_coax_get(struct snd_kcontrol *kcontrol,
            struct snd_ctl_elem_value *ucontrol)
{
      struct control_runtime *rt = snd_kcontrol_chip(kcontrol);
      ucontrol->value.enumerated.item[0] = rt->opt_coax_switch;
      return 0;
}

static struct __devinitdata snd_kcontrol_new elements[] = {
      {
            .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
            .name = "Master Playback Volume",
            .index = 0,
            .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
            .info = usb6fire_control_master_vol_info,
            .get = usb6fire_control_master_vol_get,
            .put = usb6fire_control_master_vol_put
      },
      {
            .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
            .name = "Line/Phono Capture Route",
            .index = 0,
            .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
            .info = usb6fire_control_line_phono_info,
            .get = usb6fire_control_line_phono_get,
            .put = usb6fire_control_line_phono_put
      },
      {
            .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
            .name = "Opt/Coax Capture Route",
            .index = 0,
            .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
            .info = usb6fire_control_opt_coax_info,
            .get = usb6fire_control_opt_coax_get,
            .put = usb6fire_control_opt_coax_put
      },
      {}
};

int __devinit usb6fire_control_init(struct sfire_chip *chip)
{
      int i;
      int ret;
      struct control_runtime *rt = kzalloc(sizeof(struct control_runtime),
                  GFP_KERNEL);
      struct comm_runtime *comm_rt = chip->comm;

      if (!rt)
            return -ENOMEM;

      rt->chip = chip;

      i = 0;
      while (init_data[i].type) {
            comm_rt->write8(comm_rt, init_data[i].type, init_data[i].reg,
                        init_data[i].value);
            i++;
      }

      usb6fire_control_opt_coax_update(rt);
      usb6fire_control_line_phono_update(rt);
      usb6fire_control_master_vol_update(rt);

      i = 0;
      while (elements[i].name) {
            ret = snd_ctl_add(chip->card, snd_ctl_new1(&elements[i], rt));
            if (ret < 0) {
                  kfree(rt);
                  snd_printk(KERN_ERR PREFIX "cannot add control.\n");
                  return ret;
            }
            i++;
      }

      chip->control = rt;
      return 0;
}

void usb6fire_control_abort(struct sfire_chip *chip)
{}

void usb6fire_control_destroy(struct sfire_chip *chip)
{
      kfree(chip->control);
      chip->control = NULL;
}

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