cregit-Linux how code gets into the kernel

Release 4.7 sound/firewire/oxfw/oxfw-spkr.c

/*
 * 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; }

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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; }

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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; }

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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; }

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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; }

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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; }

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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; }

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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 = kzalloc(sizeof(struct fw_spkr), GFP_KERNEL); if (spkr == NULL) 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; }

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