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usb: gadget: f_uac2: allow changing terminal types through configfs

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Add "c_terminal_type" and "p_terminal_type" configfs entries
in order to allow the user to change the capture and playback terminal
type codes.

These fields affect the type of audio device that Windows detects, so
being able to modify this is useful when it would be advantageous for
a gadget to be detected as something other than a generic
speaker/microphone.

The fields default to microphone for the capture type field and speaker
for the playback type field as was the case before.

Signed-off-by: James Gruber <jimmyjgruber@gmail.com>
Link: https://lore.kernel.org/r/20230914222746.155126-1-jimmyjgruber@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
James Gruber 2023-09-14 15:27:46 -07:00 committed by Greg Kroah-Hartman
parent af31320194
commit de2eb28cdb
4 changed files with 26 additions and 2 deletions
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2
Documentation/ABI/testing/configfs-usb-gadget-uac2
View File

@ -35,4 +35,6 @@ Description:
req_number the number of pre-allocated requests
for both capture and playback
function_name name of the interface
c_terminal_type code of the capture terminal type
p_terminal_type code of the playback terminal type
===================== =======================================

2
Documentation/usb/gadget-testing.rst
View File

@ -755,6 +755,8 @@ The uac2 function provides these attributes in its function directory:
req_number the number of pre-allocated request for both capture
and playback
function_name name of the interface
c_terminal_type code of the capture terminal type
p_terminal_type code of the playback terminal type
================ ====================================================
The attributes have sane default values.

16
drivers/usb/gadget/function/f_uac2.c
View File

@ -212,7 +212,7 @@ static struct uac2_input_terminal_descriptor io_in_it_desc = {
.bDescriptorSubtype = UAC_INPUT_TERMINAL,
/* .bTerminalID = DYNAMIC */
.wTerminalType = cpu_to_le16(UAC_INPUT_TERMINAL_MICROPHONE),
/* .wTerminalType = DYNAMIC */
.bAssocTerminal = 0,
/* .bCSourceID = DYNAMIC */
.iChannelNames = 0,
@ -240,7 +240,7 @@ static struct uac2_output_terminal_descriptor io_out_ot_desc = {
.bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
/* .bTerminalID = DYNAMIC */
.wTerminalType = cpu_to_le16(UAC_OUTPUT_TERMINAL_SPEAKER),
/* .wTerminalType = DYNAMIC */
.bAssocTerminal = 0,
/* .bSourceID = DYNAMIC */
/* .bCSourceID = DYNAMIC */
@ -977,6 +977,9 @@ static void setup_descriptor(struct f_uac2_opts *opts)
iad_desc.bInterfaceCount++;
}
io_in_it_desc.wTerminalType = cpu_to_le16(opts->c_terminal_type);
io_out_ot_desc.wTerminalType = cpu_to_le16(opts->p_terminal_type);
setup_headers(opts, fs_audio_desc, USB_SPEED_FULL);
setup_headers(opts, hs_audio_desc, USB_SPEED_HIGH);
setup_headers(opts, ss_audio_desc, USB_SPEED_SUPER);
@ -2095,6 +2098,9 @@ UAC2_ATTRIBUTE(s16, c_volume_res);
UAC2_ATTRIBUTE(u32, fb_max);
UAC2_ATTRIBUTE_STRING(function_name);
UAC2_ATTRIBUTE(s16, p_terminal_type);
UAC2_ATTRIBUTE(s16, c_terminal_type);
static struct configfs_attribute *f_uac2_attrs[] = {
&f_uac2_opts_attr_p_chmask,
&f_uac2_opts_attr_p_srate,
@ -2122,6 +2128,9 @@ static struct configfs_attribute *f_uac2_attrs[] = {
&f_uac2_opts_attr_function_name,
&f_uac2_opts_attr_p_terminal_type,
&f_uac2_opts_attr_c_terminal_type,
NULL,
};
@ -2180,6 +2189,9 @@ static struct usb_function_instance *afunc_alloc_inst(void)
snprintf(opts->function_name, sizeof(opts->function_name), "Source/Sink");
opts->p_terminal_type = UAC2_DEF_P_TERM_TYPE;
opts->c_terminal_type = UAC2_DEF_C_TERM_TYPE;
return &opts->func_inst;
}

8
drivers/usb/gadget/function/u_uac2.h
View File

@ -35,6 +35,11 @@
#define UAC2_DEF_REQ_NUM 2
#define UAC2_DEF_INT_REQ_NUM 10
#define UAC2_DEF_P_TERM_TYPE 0x301
/* UAC_OUTPUT_TERMINAL_SPEAKER */
#define UAC2_DEF_C_TERM_TYPE 0x201
/* UAC_INPUT_TERMINAL_MICROPHONE*/
struct f_uac2_opts {
struct usb_function_instance func_inst;
int p_chmask;
@ -65,6 +70,9 @@ struct f_uac2_opts {
char function_name[32];
s16 p_terminal_type;
s16 c_terminal_type;
struct mutex lock;
int refcnt;
};