text: /*
   * oxfw-spkr.c - a part of driver for OXFW970/971 based devices
   *
   * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
   * Licensed under the terms of the GNU General Public License, version 2.
   */
  
  #include "oxfw.h"
  
  struct fw_spkr {
  	bool mute;
  	s16 volume[6];
  	s16 volume_min;
  	s16 volume_max;
  
  	unsigned int mixer_channels;
  	u8 mute_fb_id;
  	u8 volume_fb_id;
  };
  
  enum control_action { CTL_READ, CTL_WRITE };
  enum control_attribute {
  	CTL_MIN		= 0x02,
  	CTL_MAX		= 0x03,
  	CTL_CURRENT	= 0x10,
  };
  
  static int avc_audio_feature_mute(struct fw_unit *unit, u8 fb_id, bool *value,
  				  enum control_action action)
  {
  	u8 *buf;
  	u8 response_ok;
  	int err;
  
  	buf = kmalloc(11, GFP_KERNEL);
  	if (!buf)
  		return -ENOMEM;
  
  	if (action == CTL_READ) {
  		buf[0] = 0x01;		/* AV/C, STATUS */
  		response_ok = 0x0c;	/*       STABLE */
  	} else {
  		buf[0] = 0x00;		/* AV/C, CONTROL */
  		response_ok = 0x09;	/*       ACCEPTED */
  	}
  	buf[1] = 0x08;			/* audio unit 0 */
  	buf[2] = 0xb8;			/* FUNCTION BLOCK */
  	buf[3] = 0x81;			/* function block type: feature */
  	buf[4] = fb_id;			/* function block ID */
  	buf[5] = 0x10;			/* control attribute: current */
  	buf[6] = 0x02;			/* selector length */
  	buf[7] = 0x00;			/* audio channel number */
  	buf[8] = 0x01;			/* control selector: mute */
  	buf[9] = 0x01;			/* control data length */
  	if (action == CTL_READ)
  		buf[10] = 0xff;
  	else
  		buf[10] = *value ? 0x70 : 0x60;
  
  	err = fcp_avc_transaction(unit, buf, 11, buf, 11, 0x3fe);
  	if (err < 0)
  		goto error;
  	if (err < 11) {
  		dev_err(&unit->device, "short FCP response\n");
  		err = -EIO;
  		goto error;
  	}
  	if (buf[0] != response_ok) {
  		dev_err(&unit->device, "mute command failed\n");
  		err = -EIO;
  		goto error;
  	}
  	if (action == CTL_READ)
  		*value = buf[10] == 0x70;
  
  	err = 0;
  
  error:
  	kfree(buf);
  
  	return err;
  }
  
  static int avc_audio_feature_volume(struct fw_unit *unit, u8 fb_id, s16 *value,
  				    unsigned int channel,
  				    enum control_attribute attribute,
  				    enum control_action action)
  {
  	u8 *buf;
  	u8 response_ok;
  	int err;
  
  	buf = kmalloc(12, GFP_KERNEL);
  	if (!buf)
  		return -ENOMEM;
  
  	if (action == CTL_READ) {
  		buf[0] = 0x01;		/* AV/C, STATUS */
  		response_ok = 0x0c;	/*       STABLE */
  	} else {
  		buf[0] = 0x00;		/* AV/C, CONTROL */
  		response_ok = 0x09;	/*       ACCEPTED */
  	}
  	buf[1] = 0x08;			/* audio unit 0 */
  	buf[2] = 0xb8;			/* FUNCTION BLOCK */
  	buf[3] = 0x81;			/* function block type: feature */
  	buf[4] = fb_id;			/* function block ID */
  	buf[5] = attribute;		/* control attribute */
  	buf[6] = 0x02;			/* selector length */
  	buf[7] = channel;		/* audio channel number */
  	buf[8] = 0x02;			/* control selector: volume */
  	buf[9] = 0x02;			/* control data length */
  	if (action == CTL_READ) {
  		buf[10] = 0xff;
  		buf[11] = 0xff;
  	} else {
  		buf[10] = *value >> 8;
  		buf[11] = *value;
  	}
  
  	err = fcp_avc_transaction(unit, buf, 12, buf, 12, 0x3fe);
  	if (err < 0)
  		goto error;
  	if (err < 12) {
  		dev_err(&unit->device, "short FCP response\n");
  		err = -EIO;
  		goto error;
  	}
  	if (buf[0] != response_ok) {
  		dev_err(&unit->device, "volume command failed\n");
  		err = -EIO;
  		goto error;
  	}
  	if (action == CTL_READ)
  		*value = (buf[10] << 8) | buf[11];
  
  	err = 0;
  
  error:
  	kfree(buf);
  
  	return err;
  }
  
  static int spkr_mute_get(struct snd_kcontrol *control,
  			 struct snd_ctl_elem_value *value)
  {
  	struct snd_oxfw *oxfw = control->private_data;
  	struct fw_spkr *spkr = oxfw->spec;
  
  	value->value.integer.value[0] = !spkr->mute;
  
  	return 0;
  }
  
  static int spkr_mute_put(struct snd_kcontrol *control,
  			 struct snd_ctl_elem_value *value)
  {
  	struct snd_oxfw *oxfw = control->private_data;
  	struct fw_spkr *spkr = oxfw->spec;
  	bool mute;
  	int err;
  
  	mute = !value->value.integer.value[0];
  
  	if (mute == spkr->mute)
  		return 0;
  
  	err = avc_audio_feature_mute(oxfw->unit, spkr->mute_fb_id, &mute,
  				     CTL_WRITE);
  	if (err < 0)
  		return err;
  	spkr->mute = mute;
  
  	return 1;
  }
  
  static int spkr_volume_info(struct snd_kcontrol *control,
  			    struct snd_ctl_elem_info *info)
  {
  	struct snd_oxfw *oxfw = control->private_data;
  	struct fw_spkr *spkr = oxfw->spec;
  
  	info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
  	info->count = spkr->mixer_channels;
  	info->value.integer.min = spkr->volume_min;
  	info->value.integer.max = spkr->volume_max;
  
  	return 0;
  }
  
  static const u8 channel_map[6] = { 0, 1, 4, 5, 2, 3 };
  
  static int spkr_volume_get(struct snd_kcontrol *control,
  			   struct snd_ctl_elem_value *value)
  {
  	struct snd_oxfw *oxfw = control->private_data;
  	struct fw_spkr *spkr = oxfw->spec;
  	unsigned int i;
  
  	for (i = 0; i < spkr->mixer_channels; ++i)
  		value->value.integer.value[channel_map[i]] = spkr->volume[i];
  
  	return 0;
  }
  
  static int spkr_volume_put(struct snd_kcontrol *control,
  			   struct snd_ctl_elem_value *value)
  {
  	struct snd_oxfw *oxfw = control->private_data;
  	struct fw_spkr *spkr = oxfw->spec;
  	unsigned int i, changed_channels;
  	bool equal_values = true;
  	s16 volume;
  	int err;
  
  	for (i = 0; i < spkr->mixer_channels; ++i) {
  		if (value->value.integer.value[i] < spkr->volume_min ||
  		    value->value.integer.value[i] > spkr->volume_max)
  			return -EINVAL;
  		if (value->value.integer.value[i] !=
  		    value->value.integer.value[0])
  			equal_values = false;
  	}
  
  	changed_channels = 0;
  	for (i = 0; i < spkr->mixer_channels; ++i)
  		if (value->value.integer.value[channel_map[i]] !=
  							spkr->volume[i])
  			changed_channels |= 1 << (i + 1);
  
  	if (equal_values && changed_channels != 0)
  		changed_channels = 1 << 0;
  
  	for (i = 0; i <= spkr->mixer_channels; ++i) {
  		volume = value->value.integer.value[channel_map[i ? i - 1 : 0]];
  		if (changed_channels & (1 << i)) {
  			err = avc_audio_feature_volume(oxfw->unit,
  						  spkr->volume_fb_id, &volume,
  						  i, CTL_CURRENT, CTL_WRITE);
  			if (err < 0)
  				return err;
  		}
  		if (i > 0)
  			spkr->volume[i - 1] = volume;
  	}
  
  	return changed_channels != 0;
  }
  
  int snd_oxfw_add_spkr(struct snd_oxfw *oxfw, bool is_lacie)
  {
  	static const struct snd_kcontrol_new controls[] = {
  		{
  			.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
  			.name = "PCM Playback Switch",
  			.info = snd_ctl_boolean_mono_info,
  			.get = spkr_mute_get,
  			.put = spkr_mute_put,
  		},
  		{
  			.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
  			.name = "PCM Playback Volume",
  			.info = spkr_volume_info,
  			.get = spkr_volume_get,
  			.put = spkr_volume_put,
  		},
  	};
  	struct fw_spkr *spkr;
  	unsigned int i, first_ch;
  	int err;
  
  	spkr = devm_kzalloc(&oxfw->card->card_dev, sizeof(struct fw_spkr),
  			    GFP_KERNEL);
  	if (!spkr)
  		return -ENOMEM;
  	oxfw->spec = spkr;
  
  	if (is_lacie) {
  		spkr->mixer_channels = 1;
  		spkr->mute_fb_id = 0x01;
  		spkr->volume_fb_id = 0x01;
  	} else {
  		spkr->mixer_channels = 6;
  		spkr->mute_fb_id = 0x01;
  		spkr->volume_fb_id = 0x02;
  	}
  
  	err = avc_audio_feature_volume(oxfw->unit, spkr->volume_fb_id,
  				       &spkr->volume_min, 0, CTL_MIN, CTL_READ);
  	if (err < 0)
  		return err;
  	err = avc_audio_feature_volume(oxfw->unit, spkr->volume_fb_id,
  				       &spkr->volume_max, 0, CTL_MAX, CTL_READ);
  	if (err < 0)
  		return err;
  
  	err = avc_audio_feature_mute(oxfw->unit, spkr->mute_fb_id, &spkr->mute,
  				     CTL_READ);
  	if (err < 0)
  		return err;
  
  	first_ch = spkr->mixer_channels == 1 ? 0 : 1;
  	for (i = 0; i < spkr->mixer_channels; ++i) {
  		err = avc_audio_feature_volume(oxfw->unit, spkr->volume_fb_id,
  					       &spkr->volume[i], first_ch + i,
  					       CTL_CURRENT, CTL_READ);
  		if (err < 0)
  			return err;
  	}
  
  	for (i = 0; i < ARRAY_SIZE(controls); ++i) {
  		err = snd_ctl_add(oxfw->card,
  				  snd_ctl_new1(&controls[i], oxfw));
  		if (err < 0)
  			return err;
  	}
  
  	return 0;
  }
  