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mixer.c
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/*
* (Tentative) USB Audio Driver for ALSA
*
* Mixer control part
*
* Copyright (c) 2002 by Takashi Iwai <[email protected]>
*
* Many codes borrowed from audio.c by
* Alan Cox ([email protected])
* Thomas Sailer ([email protected])
*
*
* 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 <linux/bitops.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/usb.h>
#include <linux/usb/audio.h>
#include <linux/usb/audio-v2.h>
#include <sound/core.h>
#include <sound/control.h>
#include <sound/hwdep.h>
#include <sound/info.h>
#include <sound/tlv.h>
#include "usbaudio.h"
#include "mixer.h"
#include "helper.h"
#include "mixer_quirks.h"
#define MAX_ID_ELEMS 256
struct usb_audio_term {
int id;
int type;
int channels;
unsigned int chconfig;
int name;
};
struct usbmix_name_map;
struct mixer_build {
struct snd_usb_audio *chip;
struct usb_mixer_interface *mixer;
unsigned char *buffer;
unsigned int buflen;
DECLARE_BITMAP(unitbitmap, MAX_ID_ELEMS);
struct usb_audio_term oterm;
const struct usbmix_name_map *map;
const struct usbmix_selector_map *selector_map;
};
enum {
USB_MIXER_BOOLEAN,
USB_MIXER_INV_BOOLEAN,
USB_MIXER_S8,
USB_MIXER_U8,
USB_MIXER_S16,
USB_MIXER_U16,
};
/*E-mu 0202(0404) eXtension Unit(XU) control*/
enum {
USB_XU_CLOCK_RATE = 0xe301,
USB_XU_CLOCK_SOURCE = 0xe302,
USB_XU_DIGITAL_IO_STATUS = 0xe303,
USB_XU_DEVICE_OPTIONS = 0xe304,
USB_XU_DIRECT_MONITORING = 0xe305,
USB_XU_METERING = 0xe306
};
enum {
USB_XU_CLOCK_SOURCE_SELECTOR = 0x02, /* clock source*/
USB_XU_CLOCK_RATE_SELECTOR = 0x03, /* clock rate */
USB_XU_DIGITAL_FORMAT_SELECTOR = 0x01, /* the spdif format */
USB_XU_SOFT_LIMIT_SELECTOR = 0x03 /* soft limiter */
};
/*
* manual mapping of mixer names
* if the mixer topology is too complicated and the parsed names are
* ambiguous, add the entries in usbmixer_maps.c.
*/
#include "mixer_maps.c"
static const struct usbmix_name_map *
find_map(struct mixer_build *state, int unitid, int control)
{
const struct usbmix_name_map *p = state->map;
if (!p)
return NULL;
for (p = state->map; p->id; p++) {
if (p->id == unitid &&
(!control || !p->control || control == p->control))
return p;
}
return NULL;
}
/* get the mapped name if the unit matches */
static int
check_mapped_name(const struct usbmix_name_map *p, char *buf, int buflen)
{
if (!p || !p->name)
return 0;
buflen--;
return strlcpy(buf, p->name, buflen);
}
/* check whether the control should be ignored */
static inline int
check_ignored_ctl(const struct usbmix_name_map *p)
{
if (!p || p->name || p->dB)
return 0;
return 1;
}
/* dB mapping */
static inline void check_mapped_dB(const struct usbmix_name_map *p,
struct usb_mixer_elem_info *cval)
{
if (p && p->dB) {
cval->dBmin = p->dB->min;
cval->dBmax = p->dB->max;
}
}
/* get the mapped selector source name */
static int check_mapped_selector_name(struct mixer_build *state, int unitid,
int index, char *buf, int buflen)
{
const struct usbmix_selector_map *p;
if (! state->selector_map)
return 0;
for (p = state->selector_map; p->id; p++) {
if (p->id == unitid && index < p->count)
return strlcpy(buf, p->names[index], buflen);
}
return 0;
}
/*
* find an audio control unit with the given unit id
*/
static void *find_audio_control_unit(struct mixer_build *state, unsigned char unit)
{
/* we just parse the header */
struct uac_feature_unit_descriptor *hdr = NULL;
while ((hdr = snd_usb_find_desc(state->buffer, state->buflen, hdr,
USB_DT_CS_INTERFACE)) != NULL) {
if (hdr->bLength >= 4 &&
hdr->bDescriptorSubtype >= UAC_INPUT_TERMINAL &&
hdr->bDescriptorSubtype <= UAC2_SAMPLE_RATE_CONVERTER &&
hdr->bUnitID == unit)
return hdr;
}
return NULL;
}
/*
* copy a string with the given id
*/
static int snd_usb_copy_string_desc(struct mixer_build *state, int index, char *buf, int maxlen)
{
int len = usb_string(state->chip->dev, index, buf, maxlen - 1);
buf[len] = 0;
return len;
}
/*
* convert from the byte/word on usb descriptor to the zero-based integer
*/
static int convert_signed_value(struct usb_mixer_elem_info *cval, int val)
{
switch (cval->val_type) {
case USB_MIXER_BOOLEAN:
return !!val;
case USB_MIXER_INV_BOOLEAN:
return !val;
case USB_MIXER_U8:
val &= 0xff;
break;
case USB_MIXER_S8:
val &= 0xff;
if (val >= 0x80)
val -= 0x100;
break;
case USB_MIXER_U16:
val &= 0xffff;
break;
case USB_MIXER_S16:
val &= 0xffff;
if (val >= 0x8000)
val -= 0x10000;
break;
}
return val;
}
/*
* convert from the zero-based int to the byte/word for usb descriptor
*/
static int convert_bytes_value(struct usb_mixer_elem_info *cval, int val)
{
switch (cval->val_type) {
case USB_MIXER_BOOLEAN:
return !!val;
case USB_MIXER_INV_BOOLEAN:
return !val;
case USB_MIXER_S8:
case USB_MIXER_U8:
return val & 0xff;
case USB_MIXER_S16:
case USB_MIXER_U16:
return val & 0xffff;
}
return 0; /* not reached */
}
static int get_relative_value(struct usb_mixer_elem_info *cval, int val)
{
if (! cval->res)
cval->res = 1;
if (val < cval->min)
return 0;
else if (val >= cval->max)
return (cval->max - cval->min + cval->res - 1) / cval->res;
else
return (val - cval->min) / cval->res;
}
static int get_abs_value(struct usb_mixer_elem_info *cval, int val)
{
if (val < 0)
return cval->min;
if (! cval->res)
cval->res = 1;
val *= cval->res;
val += cval->min;
if (val > cval->max)
return cval->max;
return val;
}
/*
* retrieve a mixer value
*/
static int get_ctl_value_v1(struct usb_mixer_elem_info *cval, int request, int validx, int *value_ret)
{
unsigned char buf[2];
int val_len = cval->val_type >= USB_MIXER_S16 ? 2 : 1;
int timeout = 10;
while (timeout-- > 0) {
if (snd_usb_ctl_msg(cval->mixer->chip->dev,
usb_rcvctrlpipe(cval->mixer->chip->dev, 0),
request,
USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
validx, cval->mixer->ctrlif | (cval->id << 8),
buf, val_len, 100) >= val_len) {
*value_ret = convert_signed_value(cval, snd_usb_combine_bytes(buf, val_len));
return 0;
}
}
snd_printdd(KERN_ERR "cannot get ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
request, validx, cval->mixer->ctrlif | (cval->id << 8), cval->val_type);
return -EINVAL;
}
static int get_ctl_value_v2(struct usb_mixer_elem_info *cval, int request, int validx, int *value_ret)
{
unsigned char buf[14]; /* enough space for one range of 4 bytes */
unsigned char *val;
int ret;
__u8 bRequest;
bRequest = (request == UAC_GET_CUR) ?
UAC2_CS_CUR : UAC2_CS_RANGE;
ret = snd_usb_ctl_msg(cval->mixer->chip->dev,
usb_rcvctrlpipe(cval->mixer->chip->dev, 0),
bRequest,
USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
validx, cval->mixer->ctrlif | (cval->id << 8),
buf, sizeof(buf), 1000);
if (ret < 0) {
snd_printk(KERN_ERR "cannot get ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
request, validx, cval->mixer->ctrlif | (cval->id << 8), cval->val_type);
return ret;
}
switch (request) {
case UAC_GET_CUR:
val = buf;
break;
case UAC_GET_MIN:
val = buf + sizeof(__u16);
break;
case UAC_GET_MAX:
val = buf + sizeof(__u16) * 2;
break;
case UAC_GET_RES:
val = buf + sizeof(__u16) * 3;
break;
default:
return -EINVAL;
}
*value_ret = convert_signed_value(cval, snd_usb_combine_bytes(val, sizeof(__u16)));
return 0;
}
static int get_ctl_value(struct usb_mixer_elem_info *cval, int request, int validx, int *value_ret)
{
return (cval->mixer->protocol == UAC_VERSION_1) ?
get_ctl_value_v1(cval, request, validx, value_ret) :
get_ctl_value_v2(cval, request, validx, value_ret);
}
static int get_cur_ctl_value(struct usb_mixer_elem_info *cval, int validx, int *value)
{
return get_ctl_value(cval, UAC_GET_CUR, validx, value);
}
/* channel = 0: master, 1 = first channel */
static inline int get_cur_mix_raw(struct usb_mixer_elem_info *cval,
int channel, int *value)
{
return get_ctl_value(cval, UAC_GET_CUR, (cval->control << 8) | channel, value);
}
static int get_cur_mix_value(struct usb_mixer_elem_info *cval,
int channel, int index, int *value)
{
int err;
if (cval->cached & (1 << channel)) {
*value = cval->cache_val[index];
return 0;
}
err = get_cur_mix_raw(cval, channel, value);
if (err < 0) {
if (!cval->mixer->ignore_ctl_error)
snd_printd(KERN_ERR "cannot get current value for control %d ch %d: err = %d\n",
cval->control, channel, err);
return err;
}
cval->cached |= 1 << channel;
cval->cache_val[index] = *value;
return 0;
}
/*
* set a mixer value
*/
int snd_usb_mixer_set_ctl_value(struct usb_mixer_elem_info *cval,
int request, int validx, int value_set)
{
unsigned char buf[2];
int val_len, timeout = 10;
if (cval->mixer->protocol == UAC_VERSION_1) {
val_len = cval->val_type >= USB_MIXER_S16 ? 2 : 1;
} else { /* UAC_VERSION_2 */
/* audio class v2 controls are always 2 bytes in size */
val_len = sizeof(__u16);
/* FIXME */
if (request != UAC_SET_CUR) {
snd_printdd(KERN_WARNING "RANGE setting not yet supported\n");
return -EINVAL;
}
request = UAC2_CS_CUR;
}
value_set = convert_bytes_value(cval, value_set);
buf[0] = value_set & 0xff;
buf[1] = (value_set >> 8) & 0xff;
while (timeout-- > 0)
if (snd_usb_ctl_msg(cval->mixer->chip->dev,
usb_sndctrlpipe(cval->mixer->chip->dev, 0),
request,
USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT,
validx, cval->mixer->ctrlif | (cval->id << 8),
buf, val_len, 100) >= 0)
return 0;
snd_printdd(KERN_ERR "cannot set ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d, data = %#x/%#x\n",
request, validx, cval->mixer->ctrlif | (cval->id << 8), cval->val_type, buf[0], buf[1]);
return -EINVAL;
}
static int set_cur_ctl_value(struct usb_mixer_elem_info *cval, int validx, int value)
{
return snd_usb_mixer_set_ctl_value(cval, UAC_SET_CUR, validx, value);
}
static int set_cur_mix_value(struct usb_mixer_elem_info *cval, int channel,
int index, int value)
{
int err;
unsigned int read_only = (channel == 0) ?
cval->master_readonly :
cval->ch_readonly & (1 << (channel - 1));
if (read_only) {
snd_printdd(KERN_INFO "%s(): channel %d of control %d is read_only\n",
__func__, channel, cval->control);
return 0;
}
err = snd_usb_mixer_set_ctl_value(cval, UAC_SET_CUR, (cval->control << 8) | channel,
value);
if (err < 0)
return err;
cval->cached |= 1 << channel;
cval->cache_val[index] = value;
return 0;
}
/*
* TLV callback for mixer volume controls
*/
static int mixer_vol_tlv(struct snd_kcontrol *kcontrol, int op_flag,
unsigned int size, unsigned int __user *_tlv)
{
struct usb_mixer_elem_info *cval = kcontrol->private_data;
DECLARE_TLV_DB_MINMAX(scale, 0, 0);
if (size < sizeof(scale))
return -ENOMEM;
scale[2] = cval->dBmin;
scale[3] = cval->dBmax;
if (copy_to_user(_tlv, scale, sizeof(scale)))
return -EFAULT;
return 0;
}
/*
* parser routines begin here...
*/
static int parse_audio_unit(struct mixer_build *state, int unitid);
/*
* check if the input/output channel routing is enabled on the given bitmap.
* used for mixer unit parser
*/
static int check_matrix_bitmap(unsigned char *bmap, int ich, int och, int num_outs)
{
int idx = ich * num_outs + och;
return bmap[idx >> 3] & (0x80 >> (idx & 7));
}
/*
* add an alsa control element
* search and increment the index until an empty slot is found.
*
* if failed, give up and free the control instance.
*/
static int add_control_to_empty(struct mixer_build *state, struct snd_kcontrol *kctl)
{
struct usb_mixer_elem_info *cval = kctl->private_data;
int err;
while (snd_ctl_find_id(state->chip->card, &kctl->id))
kctl->id.index++;
if ((err = snd_ctl_add(state->chip->card, kctl)) < 0) {
snd_printd(KERN_ERR "cannot add control (err = %d)\n", err);
return err;
}
cval->elem_id = &kctl->id;
cval->next_id_elem = state->mixer->id_elems[cval->id];
state->mixer->id_elems[cval->id] = cval;
return 0;
}
/*
* get a terminal name string
*/
static struct iterm_name_combo {
int type;
char *name;
} iterm_names[] = {
{ 0x0300, "Output" },
{ 0x0301, "Speaker" },
{ 0x0302, "Headphone" },
{ 0x0303, "HMD Audio" },
{ 0x0304, "Desktop Speaker" },
{ 0x0305, "Room Speaker" },
{ 0x0306, "Com Speaker" },
{ 0x0307, "LFE" },
{ 0x0600, "External In" },
{ 0x0601, "Analog In" },
{ 0x0602, "Digital In" },
{ 0x0603, "Line" },
{ 0x0604, "Legacy In" },
{ 0x0605, "IEC958 In" },
{ 0x0606, "1394 DA Stream" },
{ 0x0607, "1394 DV Stream" },
{ 0x0700, "Embedded" },
{ 0x0701, "Noise Source" },
{ 0x0702, "Equalization Noise" },
{ 0x0703, "CD" },
{ 0x0704, "DAT" },
{ 0x0705, "DCC" },
{ 0x0706, "MiniDisk" },
{ 0x0707, "Analog Tape" },
{ 0x0708, "Phonograph" },
{ 0x0709, "VCR Audio" },
{ 0x070a, "Video Disk Audio" },
{ 0x070b, "DVD Audio" },
{ 0x070c, "TV Tuner Audio" },
{ 0x070d, "Satellite Rec Audio" },
{ 0x070e, "Cable Tuner Audio" },
{ 0x070f, "DSS Audio" },
{ 0x0710, "Radio Receiver" },
{ 0x0711, "Radio Transmitter" },
{ 0x0712, "Multi-Track Recorder" },
{ 0x0713, "Synthesizer" },
{ 0 },
};
static int get_term_name(struct mixer_build *state, struct usb_audio_term *iterm,
unsigned char *name, int maxlen, int term_only)
{
struct iterm_name_combo *names;
if (iterm->name)
return snd_usb_copy_string_desc(state, iterm->name, name, maxlen);
/* virtual type - not a real terminal */
if (iterm->type >> 16) {
if (term_only)
return 0;
switch (iterm->type >> 16) {
case UAC_SELECTOR_UNIT:
strcpy(name, "Selector"); return 8;
case UAC_PROCESSING_UNIT_V1:
strcpy(name, "Process Unit"); return 12;
case UAC_EXTENSION_UNIT_V1:
strcpy(name, "Ext Unit"); return 8;
case UAC_MIXER_UNIT:
strcpy(name, "Mixer"); return 5;
default:
return sprintf(name, "Unit %d", iterm->id);
}
}
switch (iterm->type & 0xff00) {
case 0x0100:
strcpy(name, "PCM"); return 3;
case 0x0200:
strcpy(name, "Mic"); return 3;
case 0x0400:
strcpy(name, "Headset"); return 7;
case 0x0500:
strcpy(name, "Phone"); return 5;
}
for (names = iterm_names; names->type; names++)
if (names->type == iterm->type) {
strcpy(name, names->name);
return strlen(names->name);
}
return 0;
}
/*
* parse the source unit recursively until it reaches to a terminal
* or a branched unit.
*/
static int check_input_term(struct mixer_build *state, int id, struct usb_audio_term *term)
{
int err;
void *p1;
memset(term, 0, sizeof(*term));
while ((p1 = find_audio_control_unit(state, id)) != NULL) {
unsigned char *hdr = p1;
term->id = id;
switch (hdr[2]) {
case UAC_INPUT_TERMINAL:
if (state->mixer->protocol == UAC_VERSION_1) {
struct uac_input_terminal_descriptor *d = p1;
term->type = le16_to_cpu(d->wTerminalType);
term->channels = d->bNrChannels;
term->chconfig = le16_to_cpu(d->wChannelConfig);
term->name = d->iTerminal;
} else { /* UAC_VERSION_2 */
struct uac2_input_terminal_descriptor *d = p1;
term->type = le16_to_cpu(d->wTerminalType);
term->channels = d->bNrChannels;
term->chconfig = le32_to_cpu(d->bmChannelConfig);
term->name = d->iTerminal;
/* call recursively to get the clock selectors */
err = check_input_term(state, d->bCSourceID, term);
if (err < 0)
return err;
}
return 0;
case UAC_FEATURE_UNIT: {
/* the header is the same for v1 and v2 */
struct uac_feature_unit_descriptor *d = p1;
id = d->bSourceID;
break; /* continue to parse */
}
case UAC_MIXER_UNIT: {
struct uac_mixer_unit_descriptor *d = p1;
term->type = d->bDescriptorSubtype << 16; /* virtual type */
term->channels = uac_mixer_unit_bNrChannels(d);
term->chconfig = uac_mixer_unit_wChannelConfig(d, state->mixer->protocol);
term->name = uac_mixer_unit_iMixer(d);
return 0;
}
case UAC_SELECTOR_UNIT:
case UAC2_CLOCK_SELECTOR: {
struct uac_selector_unit_descriptor *d = p1;
/* call recursively to retrieve the channel info */
if (check_input_term(state, d->baSourceID[0], term) < 0)
return -ENODEV;
term->type = d->bDescriptorSubtype << 16; /* virtual type */
term->id = id;
term->name = uac_selector_unit_iSelector(d);
return 0;
}
case UAC_PROCESSING_UNIT_V1:
case UAC_EXTENSION_UNIT_V1: {
struct uac_processing_unit_descriptor *d = p1;
if (d->bNrInPins) {
id = d->baSourceID[0];
break; /* continue to parse */
}
term->type = d->bDescriptorSubtype << 16; /* virtual type */
term->channels = uac_processing_unit_bNrChannels(d);
term->chconfig = uac_processing_unit_wChannelConfig(d, state->mixer->protocol);
term->name = uac_processing_unit_iProcessing(d, state->mixer->protocol);
return 0;
}
case UAC2_CLOCK_SOURCE: {
struct uac_clock_source_descriptor *d = p1;
term->type = d->bDescriptorSubtype << 16; /* virtual type */
term->id = id;
term->name = d->iClockSource;
return 0;
}
default:
return -ENODEV;
}
}
return -ENODEV;
}
/*
* Feature Unit
*/
/* feature unit control information */
struct usb_feature_control_info {
const char *name;
unsigned int type; /* control type (mute, volume, etc.) */
};
static struct usb_feature_control_info audio_feature_info[] = {
{ "Mute", USB_MIXER_INV_BOOLEAN },
{ "Volume", USB_MIXER_S16 },
{ "Tone Control - Bass", USB_MIXER_S8 },
{ "Tone Control - Mid", USB_MIXER_S8 },
{ "Tone Control - Treble", USB_MIXER_S8 },
{ "Graphic Equalizer", USB_MIXER_S8 }, /* FIXME: not implemeted yet */
{ "Auto Gain Control", USB_MIXER_BOOLEAN },
{ "Delay Control", USB_MIXER_U16 },
{ "Bass Boost", USB_MIXER_BOOLEAN },
{ "Loudness", USB_MIXER_BOOLEAN },
/* UAC2 specific */
{ "Input Gain Control", USB_MIXER_U16 },
{ "Input Gain Pad Control", USB_MIXER_BOOLEAN },
{ "Phase Inverter Control", USB_MIXER_BOOLEAN },
};
/* private_free callback */
static void usb_mixer_elem_free(struct snd_kcontrol *kctl)
{
kfree(kctl->private_data);
kctl->private_data = NULL;
}
/*
* interface to ALSA control for feature/mixer units
*/
/*
* retrieve the minimum and maximum values for the specified control
*/
static int get_min_max(struct usb_mixer_elem_info *cval, int default_min)
{
/* for failsafe */
cval->min = default_min;
cval->max = cval->min + 1;
cval->res = 1;
cval->dBmin = cval->dBmax = 0;
if (cval->val_type == USB_MIXER_BOOLEAN ||
cval->val_type == USB_MIXER_INV_BOOLEAN) {
cval->initialized = 1;
} else {
int minchn = 0;
if (cval->cmask) {
int i;
for (i = 0; i < MAX_CHANNELS; i++)
if (cval->cmask & (1 << i)) {
minchn = i + 1;
break;
}
}
if (get_ctl_value(cval, UAC_GET_MAX, (cval->control << 8) | minchn, &cval->max) < 0 ||
get_ctl_value(cval, UAC_GET_MIN, (cval->control << 8) | minchn, &cval->min) < 0) {
snd_printd(KERN_ERR "%d:%d: cannot get min/max values for control %d (id %d)\n",
cval->id, cval->mixer->ctrlif, cval->control, cval->id);
return -EINVAL;
}
if (get_ctl_value(cval, UAC_GET_RES, (cval->control << 8) | minchn, &cval->res) < 0) {
cval->res = 1;
} else {
int last_valid_res = cval->res;
while (cval->res > 1) {
if (snd_usb_mixer_set_ctl_value(cval, UAC_SET_RES,
(cval->control << 8) | minchn, cval->res / 2) < 0)
break;
cval->res /= 2;
}
if (get_ctl_value(cval, UAC_GET_RES, (cval->control << 8) | minchn, &cval->res) < 0)
cval->res = last_valid_res;
}
if (cval->res == 0)
cval->res = 1;
/* Additional checks for the proper resolution
*
* Some devices report smaller resolutions than actually
* reacting. They don't return errors but simply clip
* to the lower aligned value.
*/
if (cval->min + cval->res < cval->max) {
int last_valid_res = cval->res;
int saved, test, check;
get_cur_mix_raw(cval, minchn, &saved);
for (;;) {
test = saved;
if (test < cval->max)
test += cval->res;
else
test -= cval->res;
if (test < cval->min || test > cval->max ||
set_cur_mix_value(cval, minchn, 0, test) ||
get_cur_mix_raw(cval, minchn, &check)) {
cval->res = last_valid_res;
break;
}
if (test == check)
break;
cval->res *= 2;
}
set_cur_mix_value(cval, minchn, 0, saved);
}
cval->initialized = 1;
}
/* USB descriptions contain the dB scale in 1/256 dB unit
* while ALSA TLV contains in 1/100 dB unit
*/
cval->dBmin = (convert_signed_value(cval, cval->min) * 100) / 256;
cval->dBmax = (convert_signed_value(cval, cval->max) * 100) / 256;
if (cval->dBmin > cval->dBmax) {
/* something is wrong; assume it's either from/to 0dB */
if (cval->dBmin < 0)
cval->dBmax = 0;
else if (cval->dBmin > 0)
cval->dBmin = 0;
if (cval->dBmin > cval->dBmax) {
/* totally crap, return an error */
return -EINVAL;
}
}
return 0;
}
/* get a feature/mixer unit info */
static int mixer_ctl_feature_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
{
struct usb_mixer_elem_info *cval = kcontrol->private_data;
if (cval->val_type == USB_MIXER_BOOLEAN ||
cval->val_type == USB_MIXER_INV_BOOLEAN)
uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
else
uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
uinfo->count = cval->channels;
if (cval->val_type == USB_MIXER_BOOLEAN ||
cval->val_type == USB_MIXER_INV_BOOLEAN) {
uinfo->value.integer.min = 0;
uinfo->value.integer.max = 1;
} else {
if (! cval->initialized)
get_min_max(cval, 0);
uinfo->value.integer.min = 0;
uinfo->value.integer.max =
(cval->max - cval->min + cval->res - 1) / cval->res;
}
return 0;
}
/* get the current value from feature/mixer unit */
static int mixer_ctl_feature_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
{
struct usb_mixer_elem_info *cval = kcontrol->private_data;
int c, cnt, val, err;
ucontrol->value.integer.value[0] = cval->min;
if (cval->cmask) {
cnt = 0;
for (c = 0; c < MAX_CHANNELS; c++) {
if (!(cval->cmask & (1 << c)))
continue;
err = get_cur_mix_value(cval, c + 1, cnt, &val);
if (err < 0)
return cval->mixer->ignore_ctl_error ? 0 : err;
val = get_relative_value(cval, val);
ucontrol->value.integer.value[cnt] = val;
cnt++;
}
return 0;
} else {
/* master channel */
err = get_cur_mix_value(cval, 0, 0, &val);
if (err < 0)
return cval->mixer->ignore_ctl_error ? 0 : err;
val = get_relative_value(cval, val);
ucontrol->value.integer.value[0] = val;
}
return 0;
}
/* put the current value to feature/mixer unit */
static int mixer_ctl_feature_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
{
struct usb_mixer_elem_info *cval = kcontrol->private_data;
int c, cnt, val, oval, err;
int changed = 0;
if (cval->cmask) {
cnt = 0;
for (c = 0; c < MAX_CHANNELS; c++) {
if (!(cval->cmask & (1 << c)))
continue;
err = get_cur_mix_value(cval, c + 1, cnt, &oval);
if (err < 0)
return cval->mixer->ignore_ctl_error ? 0 : err;
val = ucontrol->value.integer.value[cnt];
val = get_abs_value(cval, val);
if (oval != val) {
set_cur_mix_value(cval, c + 1, cnt, val);
changed = 1;
}
cnt++;
}
} else {
/* master channel */
err = get_cur_mix_value(cval, 0, 0, &oval);
if (err < 0)
return cval->mixer->ignore_ctl_error ? 0 : err;
val = ucontrol->value.integer.value[0];
val = get_abs_value(cval, val);
if (val != oval) {
set_cur_mix_value(cval, 0, 0, val);
changed = 1;
}
}
return changed;
}
static struct snd_kcontrol_new usb_feature_unit_ctl = {
.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
.name = "", /* will be filled later manually */
.info = mixer_ctl_feature_info,
.get = mixer_ctl_feature_get,
.put = mixer_ctl_feature_put,
};
/* the read-only variant */
static struct snd_kcontrol_new usb_feature_unit_ctl_ro = {
.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
.name = "", /* will be filled later manually */
.info = mixer_ctl_feature_info,
.get = mixer_ctl_feature_get,
.put = NULL,
};
/*
* build a feature control
*/
static size_t append_ctl_name(struct snd_kcontrol *kctl, const char *str)
{
return strlcat(kctl->id.name, str, sizeof(kctl->id.name));
}
static void build_feature_ctl(struct mixer_build *state, void *raw_desc,
unsigned int ctl_mask, int control,
struct usb_audio_term *iterm, int unitid,
int readonly_mask)
{
struct uac_feature_unit_descriptor *desc = raw_desc;
unsigned int len = 0;
int mapped_name = 0;
int nameid = uac_feature_unit_iFeature(desc);
struct snd_kcontrol *kctl;
struct usb_mixer_elem_info *cval;
const struct usbmix_name_map *map;
control++; /* change from zero-based to 1-based value */
if (control == UAC_FU_GRAPHIC_EQUALIZER) {
/* FIXME: not supported yet */
return;
}
map = find_map(state, unitid, control);
if (check_ignored_ctl(map))
return;
cval = kzalloc(sizeof(*cval), GFP_KERNEL);
if (! cval) {
snd_printk(KERN_ERR "cannot malloc kcontrol\n");
return;
}
cval->mixer = state->mixer;
cval->id = unitid;
cval->control = control;
cval->cmask = ctl_mask;
cval->val_type = audio_feature_info[control-1].type;
if (ctl_mask == 0) {
cval->channels = 1; /* master channel */
cval->master_readonly = readonly_mask;
} else {
int i, c = 0;
for (i = 0; i < 16; i++)
if (ctl_mask & (1 << i))
c++;
cval->channels = c;
cval->ch_readonly = readonly_mask;
}