Commit bc18e31c authored by Julian Scheel's avatar Julian Scheel Committed by Takashi Iwai
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ALSA: usb-audio: Fix parameter block size for UAC2 control requests 



USB Audio Class version 2.0 supports three different parameter block sizes for
CUR requests, which are 1 byte (5.2.3.1 Layout 1 Parameter Block), 2 bytes
(5.2.3.2 Layout 2 Parameter Block) and 4 bytes (5.2.3.3 Layout 3 Parameter
Block). Use the correct size according to the specific control as it was
already done for UACv1. The allocated block size for control requests is
increased to support the 4 byte worst case.

Signed-off-by: default avatarJulian Scheel <julian@jusst.de>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent 41450b1b

sound/usb/mixer.c

+44 −20
Original line number Diff line number Diff line
@@ -282,6 +282,21 @@ static int get_abs_value(struct usb_mixer_elem_info *cval, int val) 
	return val;

}



static int uac2_ctl_value_size(int val_type)

{

	switch (val_type) {

	case USB_MIXER_S32:

	case USB_MIXER_U32:

		return 4;

	case USB_MIXER_S16:

	case USB_MIXER_U16:

		return 2;

	default:

		return 1;

	}

	return 0; /* unreachable */

}





/*

 * retrieve a mixer value
@@ -328,14 +343,14 @@ static int get_ctl_value_v2(struct usb_mixer_elem_info *cval, int request, 
			    int validx, int *value_ret)

{

	struct snd_usb_audio *chip = cval->head.mixer->chip;

	unsigned char buf[2 + 3 * sizeof(__u16)]; /* enough space for one range */

	unsigned char buf[4 + 3 * sizeof(__u32)]; /* enough space for one range */

	unsigned char *val;

	int idx = 0, ret, size;

	__u8 bRequest;



	if (request == UAC_GET_CUR) {

		bRequest = UAC2_CS_CUR;

		size = sizeof(__u16);

		size = uac2_ctl_value_size(cval->val_type);

	} else {

		bRequest = UAC2_CS_RANGE;

		size = sizeof(buf);
@@ -446,7 +461,7 @@ int snd_usb_mixer_set_ctl_value(struct usb_mixer_elem_info *cval, 
				int request, int validx, int value_set)

{

	struct snd_usb_audio *chip = cval->head.mixer->chip;

	unsigned char buf[2];

	unsigned char buf[4];

	int idx = 0, val_len, err, timeout = 10;



	validx += cval->idx_off;
@@ -454,8 +469,7 @@ int snd_usb_mixer_set_ctl_value(struct usb_mixer_elem_info *cval, 
	if (cval->head.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);

		val_len = uac2_ctl_value_size(cval->val_type);



		/* FIXME */

		if (request != UAC_SET_CUR) {
@@ -469,6 +483,8 @@ int snd_usb_mixer_set_ctl_value(struct usb_mixer_elem_info *cval, 
	value_set = convert_bytes_value(cval, value_set);

	buf[0] = value_set & 0xff;

	buf[1] = (value_set >> 8) & 0xff;

	buf[2] = (value_set >> 16) & 0xff;

	buf[3] = (value_set >> 24) & 0xff;

	err = snd_usb_autoresume(chip);

	if (err < 0)

		return -EIO;
@@ -798,24 +814,25 @@ static int check_input_term(struct mixer_build *state, int id, 
/* feature unit control information */

struct usb_feature_control_info {

	const char *name;

	unsigned int type;	/* control type (mute, volume, etc.) */

	int type;	/* data type for uac1 */

	int type_uac2;	/* data type for uac2 if different from uac1, else -1 */

};



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 }, /* FIXME: U32 in UAC2 */

	{ "Bass Boost",			USB_MIXER_BOOLEAN },

	{ "Loudness",			USB_MIXER_BOOLEAN },

	{ "Mute",			USB_MIXER_INV_BOOLEAN, -1 },

	{ "Volume",			USB_MIXER_S16, -1 },

	{ "Tone Control - Bass",	USB_MIXER_S8, -1 },

	{ "Tone Control - Mid",		USB_MIXER_S8, -1 },

	{ "Tone Control - Treble",	USB_MIXER_S8, -1 },

	{ "Graphic Equalizer",		USB_MIXER_S8, -1 }, /* FIXME: not implemeted yet */

	{ "Auto Gain Control",		USB_MIXER_BOOLEAN, -1 },

	{ "Delay Control",		USB_MIXER_U16, USB_MIXER_U32 },

	{ "Bass Boost",			USB_MIXER_BOOLEAN, -1 },

	{ "Loudness",			USB_MIXER_BOOLEAN, -1 },

	/* UAC2 specific */

	{ "Input Gain Control",		USB_MIXER_S16 },

	{ "Input Gain Pad Control",	USB_MIXER_S16 },

	{ "Phase Inverter Control",	USB_MIXER_BOOLEAN },

	{ "Input Gain Control",		USB_MIXER_S16, -1 },

	{ "Input Gain Pad Control",	USB_MIXER_S16, -1 },

	{ "Phase Inverter Control",	USB_MIXER_BOOLEAN, -1 },

};



/* private_free callback */
@@ -1215,6 +1232,7 @@ static void build_feature_ctl(struct mixer_build *state, void *raw_desc, 
			      int readonly_mask)

{

	struct uac_feature_unit_descriptor *desc = raw_desc;

	struct usb_feature_control_info *ctl_info;

	unsigned int len = 0;

	int mapped_name = 0;

	int nameid = uac_feature_unit_iFeature(desc);
@@ -1240,7 +1258,13 @@ static void build_feature_ctl(struct mixer_build *state, void *raw_desc, 
	snd_usb_mixer_elem_init_std(&cval->head, state->mixer, unitid);

	cval->control = control;

	cval->cmask = ctl_mask;

	cval->val_type = audio_feature_info[control-1].type;

	ctl_info = &audio_feature_info[control-1];

	if (state->mixer->protocol == UAC_VERSION_1)

		cval->val_type = ctl_info->type;

	else /* UAC_VERSION_2 */

		cval->val_type = ctl_info->type_uac2 >= 0 ?

			ctl_info->type_uac2 : ctl_info->type;



	if (ctl_mask == 0) {

		cval->channels = 1;	/* master channel */

		cval->master_readonly = readonly_mask;

sound/usb/mixer.h

+2 −0
Original line number Diff line number Diff line
@@ -33,6 +33,8 @@ enum { 
	USB_MIXER_U8,

	USB_MIXER_S16,

	USB_MIXER_U16,

	USB_MIXER_S32,

	USB_MIXER_U32,

};



typedef void (*usb_mixer_elem_dump_func_t)(struct snd_info_buffer *buffer,

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