usbmixer.c

linux 内核源代码

/*
 *   (Tentative) USB Audio Driver for ALSA
 *
 *   Mixer control part
 *
 *   Copyright (c) 2002 by Takashi Iwai <[e-mail]>
 *
 *   Many codes borrowed from audio.c by
 *	    Alan Cox ([e-mail])
 *	    Thomas Sailer ([e-mail])
 *
 *
 *   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 <linux/bitops.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/usb.h>
#include <sound/core.h>
#include <sound/control.h>
#include <sound/hwdep.h>
#include <sound/info.h>
#include <sound/tlv.h>

#include "usbaudio.h"

/*
 */

/* ignore error from controls - for debugging */
/* #define IGNORE_CTL_ERROR */

/*
 * Sound Blaster remote control configuration
 *
 * format of remote control data:
 * Extigy:       xx 00
 * Audigy 2 NX:  06 80 xx 00 00 00
 * Live! 24-bit: 06 80 xx yy 22 83
 */
static const struct rc_config {
	u32 usb_id;
	u8  offset;
	u8  length;
	u8  packet_length;
	u8  mute_mixer_id;
	u32 mute_code;
} rc_configs[] = {
	{ USB_ID(0x041e, 0x3000), 0, 1, 2,  18, 0x0013 }, /* Extigy       */
	{ USB_ID(0x041e, 0x3020), 2, 1, 6,  18, 0x0013 }, /* Audigy 2 NX  */
	{ USB_ID(0x041e, 0x3040), 2, 2, 6,  2,  0x6e91 }, /* Live! 24-bit */
};

struct usb_mixer_interface {
	struct snd_usb_audio *chip;
	unsigned int ctrlif;
	struct list_head list;
	unsigned int ignore_ctl_error;
	struct urb *urb;
	struct usb_mixer_elem_info **id_elems; /* array[256], indexed by unit id */

	/* Sound Blaster remote control stuff */
	const struct rc_config *rc_cfg;
	unsigned long rc_hwdep_open;
	u32 rc_code;
	wait_queue_head_t rc_waitq;
	struct urb *rc_urb;
	struct usb_ctrlrequest *rc_setup_packet;
	u8 rc_buffer[6];

	u8 audigy2nx_leds[3];
};


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, 256);
	struct usb_audio_term oterm;
	const struct usbmix_name_map *map;
	const struct usbmix_selector_map *selector_map;
};

struct usb_mixer_elem_info {
	struct usb_mixer_interface *mixer;
	struct usb_mixer_elem_info *next_id_elem; /* list of controls with same id */
	struct snd_ctl_elem_id *elem_id;
	unsigned int id;
	unsigned int control;	/* CS or ICN (high byte) */
	unsigned int cmask; /* channel mask bitmap: 0 = master */
	int channels;
	int val_type;
	int min, max, res;
	u8 initialized;
};


enum {
	USB_FEATURE_NONE = 0,
	USB_FEATURE_MUTE = 1,
	USB_FEATURE_VOLUME,
	USB_FEATURE_BASS,
	USB_FEATURE_MID,
	USB_FEATURE_TREBLE,
	USB_FEATURE_GEQ,
	USB_FEATURE_AGC,
	USB_FEATURE_DELAY,
	USB_FEATURE_BASSBOOST,
	USB_FEATURE_LOUDNESS
};

enum {
	USB_MIXER_BOOLEAN,
	USB_MIXER_INV_BOOLEAN,
	USB_MIXER_S8,
	USB_MIXER_U8,
	USB_MIXER_S16,
	USB_MIXER_U16,
};

enum {
	USB_PROC_UPDOWN = 1,
	USB_PROC_UPDOWN_SWITCH = 1,
	USB_PROC_UPDOWN_MODE_SEL = 2,

	USB_PROC_PROLOGIC = 2,
	USB_PROC_PROLOGIC_SWITCH = 1,
	USB_PROC_PROLOGIC_MODE_SEL = 2,

	USB_PROC_3DENH = 3,
	USB_PROC_3DENH_SWITCH = 1,
	USB_PROC_3DENH_SPACE = 2,

	USB_PROC_REVERB = 4,
	USB_PROC_REVERB_SWITCH = 1,
	USB_PROC_REVERB_LEVEL = 2,
	USB_PROC_REVERB_TIME = 3,
	USB_PROC_REVERB_DELAY = 4,

	USB_PROC_CHORUS = 5,
	USB_PROC_CHORUS_SWITCH = 1,
	USB_PROC_CHORUS_LEVEL = 2,
	USB_PROC_CHORUS_RATE = 3,
	USB_PROC_CHORUS_DEPTH = 4,

	USB_PROC_DCR = 6,
	USB_PROC_DCR_SWITCH = 1,
	USB_PROC_DCR_RATIO = 2,
	USB_PROC_DCR_MAX_AMP = 3,
	USB_PROC_DCR_THRESHOLD = 4,
	USB_PROC_DCR_ATTACK = 5,
	USB_PROC_DCR_RELEASE = 6,
};

#define MAX_CHANNELS	10	/* max logical channels */


/*
 * 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 "usbmixer_maps.c"

/* get the mapped name if the unit matches */
static int check_mapped_name(struct mixer_build *state, int unitid, int control, char *buf, int buflen)
{
	const struct usbmix_name_map *p;

	if (! state->map)
		return 0;

	for (p = state->map; p->id; p++) {
		if (p->id == unitid && p->name &&
		    (! control || ! p->control || control == p->control)) {
			buflen--;
			return strlcpy(buf, p->name, buflen);
		}
	}
	return 0;
}

/* check whether the control should be ignored */
static int check_ignored_ctl(struct mixer_build *state, int unitid, int control)
{
	const struct usbmix_name_map *p;

	if (! state->map)
		return 0;
	for (p = state->map; p->id; p++) {
		if (p->id == unitid && ! p->name &&
		    (! control || ! p->control || control == p->control)) {
			// printk("ignored control %d:%d\n", unitid, control);
			return 1;
		}
	}
	return 0;
}

/* 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)
{
	unsigned char *p;

	p = NULL;
	while ((p = snd_usb_find_desc(state->buffer, state->buflen, p,
				      USB_DT_CS_INTERFACE)) != NULL) {
		if (p[0] >= 4 && p[2] >= INPUT_TERMINAL && p[2] <= EXTENSION_UNIT && p[3] == unit)
			return p;
	}
	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(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_cur_ctl_value(struct usb_mixer_elem_info *cval, int validx, int *value)
{
	return get_ctl_value(cval, GET_CUR, validx, value);
}

/* channel = 0: master, 1 = first channel */
static inline int get_cur_mix_value(struct usb_mixer_elem_info *cval, int channel, int *value)
{
	return get_ctl_value(cval, GET_CUR, (cval->control << 8) | channel, value);
}

/*
 * set a mixer value
 */

static int set_ctl_value(struct usb_mixer_elem_info *cval, int request, int validx, int value_set)
{
	unsigned char buf[2];
	int val_len = cval->val_type >= USB_MIXER_S16 ? 2 : 1;
	int timeout = 10;

	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 set_ctl_value(cval, SET_CUR, validx, value);
}

static inline int set_cur_mix_value(struct usb_mixer_elem_info *cval, int channel, int value)
{
	return set_ctl_value(cval, SET_CUR, (cval->control << 8) | channel, value);
}

/*
 * 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_SCALE(scale, 0, 0, 0);

	if (size < sizeof(scale))
		return -ENOMEM;
	/* USB descriptions contain the dB scale in 1/256 dB unit
	 * while ALSA TLV contains in 1/100 dB unit
	 */
	scale[2] = (convert_signed_value(cval, cval->min) * 100) / 256;
	scale[3] = (convert_signed_value(cval, cval->res) * 100) / 256;
	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" },