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usb: gadget: f_uac1: Support multiple sampling rates 

A list of sampling rates can be specified via configfs. All enabled
sampling rates are sent to the USB host on request. When the host
selects a sampling rate the internal active rate is updated.

Config strings with single value stay compatible with the previous version.

Multiple samplerates passed as configuration arrays to g_audio module
when built for f_uac1.

Signed-off-by: Julian Scheel <julian@jusst.de>
Signed-off-by: Pavel Hofman <pavel.hofman@ivitera.com>
Link: https://lore.kernel.org/r/20220121155308.48794-7-pavel.hofman@ivitera.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Julian Scheel 2022-01-21 16:53:04 +01:00 committed by Greg Kroah-Hartman
parent a7339e4f57
commit 695d39ffc2
5 changed files with 179 additions and 40 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
Documentation/ABI/testing/configfs-usb-gadget-uac1
View File

@ -6,7 +6,7 @@ Description:
===================== =======================================
c_chmask capture channel mask
c_srate capture sampling rate
c_srate list of capture sampling rates (comma-separated)
c_ssize capture sample size (bytes)
c_mute_present capture mute control enable
c_volume_present capture volume control enable
@ -17,7 +17,7 @@ Description:
c_volume_res capture volume control resolution
(in 1/256 dB)
p_chmask playback channel mask
p_srate playback sampling rate
p_srate list of playback sampling rates (comma-separated)
p_ssize playback sample size (bytes)
p_mute_present playback mute control enable
p_volume_present playback volume control enable

4
Documentation/usb/gadget-testing.rst
View File

@ -916,7 +916,7 @@ The uac1 function provides these attributes in its function directory:
================ ====================================================
c_chmask capture channel mask
c_srate capture sampling rate
c_srate list of capture sampling rates (comma-separated)
c_ssize capture sample size (bytes)
c_mute_present capture mute control enable
c_volume_present capture volume control enable
@ -924,7 +924,7 @@ The uac1 function provides these attributes in its function directory:
c_volume_max capture volume control max value (in 1/256 dB)
c_volume_res capture volume control resolution (in 1/256 dB)
p_chmask playback channel mask
p_srate playback sampling rate
p_srate list of playback sampling rates (comma-separated)
p_ssize playback sample size (bytes)
p_mute_present playback mute control enable
p_volume_present playback volume control enable

181
drivers/usb/gadget/function/f_uac1.c
View File

@ -3,6 +3,7 @@
* f_uac1.c -- USB Audio Class 1.0 Function (using u_audio API)
*
* Copyright (C) 2016 Ruslan Bilovol <ruslan.bilovol@gmail.com>
* Copyright (C) 2021 Julian Scheel <julian@jusst.de>
*
* This driver doesn't expect any real Audio codec to be present
* on the device - the audio streams are simply sinked to and
@ -42,6 +43,9 @@ struct f_uac1 {
/* Interrupt IN endpoint of AC interface */
struct usb_ep *int_ep;
atomic_t int_count;
int ctl_id; /* EP id */
int c_srate; /* current capture srate */
int p_srate; /* current playback prate */
};
static inline struct f_uac1 *func_to_uac1(struct usb_function *f)
@ -188,16 +192,18 @@ static struct uac1_as_header_descriptor as_in_header_desc = {
.wFormatTag = cpu_to_le16(UAC_FORMAT_TYPE_I_PCM),
};
DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(1);
DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(UAC_MAX_RATES);
#define uac_format_type_i_discrete_descriptor \
uac_format_type_i_discrete_descriptor_##UAC_MAX_RATES
static struct uac_format_type_i_discrete_descriptor_1 as_out_type_i_desc = {
.bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1),
static struct uac_format_type_i_discrete_descriptor as_out_type_i_desc = {
.bLength = 0, /* filled on rate setup */
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubtype = UAC_FORMAT_TYPE,
.bFormatType = UAC_FORMAT_TYPE_I,
.bSubframeSize = 2,
.bBitResolution = 16,
.bSamFreqType = 1,
.bSamFreqType = 0, /* filled on rate setup */
};
/* Standard ISO OUT Endpoint Descriptor */
@ -221,14 +227,14 @@ static struct uac_iso_endpoint_descriptor as_iso_out_desc = {
.wLockDelay = cpu_to_le16(1),
};
static struct uac_format_type_i_discrete_descriptor_1 as_in_type_i_desc = {
.bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1),
static struct uac_format_type_i_discrete_descriptor as_in_type_i_desc = {
.bLength = 0, /* filled on rate setup */
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubtype = UAC_FORMAT_TYPE,
.bFormatType = UAC_FORMAT_TYPE_I,
.bSubframeSize = 2,
.bBitResolution = 16,
.bSamFreqType = 1,
.bSamFreqType = 0, /* filled on rate setup */
};
/* Standard ISO OUT Endpoint Descriptor */
@ -333,6 +339,30 @@ static struct usb_gadget_strings *uac1_strings[] = {
* This function is an ALSA sound card following USB Audio Class Spec 1.0.
*/
static void uac_cs_attr_sample_rate(struct usb_ep *ep, struct usb_request *req)
{
struct usb_function *fn = ep->driver_data;
struct usb_composite_dev *cdev = fn->config->cdev;
struct g_audio *agdev = func_to_g_audio(fn);
struct f_uac1 *uac1 = func_to_uac1(fn);
u8 *buf = (u8 *)req->buf;
u32 val = 0;
if (req->actual != 3) {
WARN(cdev, "Invalid data size for UAC_EP_CS_ATTR_SAMPLE_RATE.\n");
return;
}
val = buf[0] | (buf[1] << 8) | (buf[2] << 16);
if (uac1->ctl_id == (USB_DIR_IN | 2)) {
uac1->p_srate = val;
u_audio_set_playback_srate(agdev, uac1->p_srate);
} else if (uac1->ctl_id == (USB_DIR_OUT | 1)) {
uac1->c_srate = val;
u_audio_set_capture_srate(agdev, uac1->c_srate);
}
}
static void audio_notify_complete(struct usb_ep *_ep, struct usb_request *req)
{
struct g_audio *audio = req->context;
@ -707,18 +737,27 @@ static int audio_set_endpoint_req(struct usb_function *f,
const struct usb_ctrlrequest *ctrl)
{
struct usb_composite_dev *cdev = f->config->cdev;
struct usb_request *req = f->config->cdev->req;
struct f_uac1 *uac1 = func_to_uac1(f);
int value = -EOPNOTSUPP;
u16 ep = le16_to_cpu(ctrl->wIndex);
u16 len = le16_to_cpu(ctrl->wLength);
u16 w_value = le16_to_cpu(ctrl->wValue);
u8 cs = w_value >> 8;
DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
ctrl->bRequest, w_value, len, ep);
switch (ctrl->bRequest) {
case UAC_SET_CUR:
case UAC_SET_CUR: {
if (cs == UAC_EP_CS_ATTR_SAMPLE_RATE) {
cdev->gadget->ep0->driver_data = f;
uac1->ctl_id = ep;
req->complete = uac_cs_attr_sample_rate;
}
value = len;
break;
}
case UAC_SET_MIN:
break;
@ -743,16 +782,33 @@ static int audio_get_endpoint_req(struct usb_function *f,
const struct usb_ctrlrequest *ctrl)
{
struct usb_composite_dev *cdev = f->config->cdev;
struct usb_request *req = f->config->cdev->req;
struct f_uac1 *uac1 = func_to_uac1(f);
u8 *buf = (u8 *)req->buf;
int value = -EOPNOTSUPP;
u8 ep = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
u8 ep = le16_to_cpu(ctrl->wIndex);
u16 len = le16_to_cpu(ctrl->wLength);
u16 w_value = le16_to_cpu(ctrl->wValue);
u8 cs = w_value >> 8;
u32 val = 0;
DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
ctrl->bRequest, w_value, len, ep);
switch (ctrl->bRequest) {
case UAC_GET_CUR:
case UAC_GET_CUR: {
if (cs == UAC_EP_CS_ATTR_SAMPLE_RATE) {
if (ep == (USB_DIR_IN | 2))
val = uac1->p_srate;
else if (ep == (USB_DIR_OUT | 1))
val = uac1->c_srate;
buf[2] = (val >> 16) & 0xff;
buf[1] = (val >> 8) & 0xff;
buf[0] = val & 0xff;
}
value = len;
break;
}
case UAC_GET_MIN:
case UAC_GET_MAX:
case UAC_GET_RES:
@ -1074,10 +1130,10 @@ static int f_audio_validate_opts(struct g_audio *audio, struct device *dev)
} else if ((opts->c_ssize < 1) || (opts->c_ssize > 4)) {
dev_err(dev, "Error: incorrect capture sample size\n");
return -EINVAL;
} else if (!opts->p_srate) {
} else if (!opts->p_srates[0]) {
dev_err(dev, "Error: incorrect playback sampling rate\n");
return -EINVAL;
} else if (!opts->c_srate) {
} else if (!opts->c_srates[0]) {
dev_err(dev, "Error: incorrect capture sampling rate\n");
return -EINVAL;
}
@ -1118,10 +1174,9 @@ static int f_audio_bind(struct usb_configuration *c, struct usb_function *f)
struct f_uac1_opts *audio_opts;
struct usb_ep *ep = NULL;
struct usb_string *us;
u8 *sam_freq;
int rate;
int ba_iface_id;
int status;
int idx, i;
status = f_audio_validate_opts(audio, dev);
if (status)
@ -1213,12 +1268,25 @@ static int f_audio_bind(struct usb_configuration *c, struct usb_function *f)
}
/* Set sample rates */
rate = audio_opts->c_srate;
sam_freq = as_out_type_i_desc.tSamFreq[0];
memcpy(sam_freq, &rate, 3);
rate = audio_opts->p_srate;
sam_freq = as_in_type_i_desc.tSamFreq[0];
memcpy(sam_freq, &rate, 3);
for (i = 0, idx = 0; i < UAC_MAX_RATES; i++) {
if (audio_opts->c_srates[i] == 0)
break;
memcpy(as_out_type_i_desc.tSamFreq[idx++],
&audio_opts->c_srates[i], 3);
}
as_out_type_i_desc.bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(idx);
as_out_type_i_desc.bSamFreqType = idx;
for (i = 0, idx = 0; i < UAC_MAX_RATES; i++) {
if (audio_opts->p_srates[i] == 0)
break;
memcpy(as_in_type_i_desc.tSamFreq[idx++],
&audio_opts->p_srates[i], 3);
}
as_in_type_i_desc.bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(idx);
as_in_type_i_desc.bSamFreqType = idx;
uac1->p_srate = audio_opts->p_srates[0];
uac1->c_srate = audio_opts->c_srates[0];
/* allocate instance-specific interface IDs, and patch descriptors */
status = usb_interface_id(c, f);
@ -1297,7 +1365,8 @@ static int f_audio_bind(struct usb_configuration *c, struct usb_function *f)
audio->out_ep_maxpsize = le16_to_cpu(as_out_ep_desc.wMaxPacketSize);
audio->in_ep_maxpsize = le16_to_cpu(as_in_ep_desc.wMaxPacketSize);
audio->params.c_chmask = audio_opts->c_chmask;
audio->params.c_srates[0] = audio_opts->c_srate;
memcpy(audio->params.c_srates, audio_opts->c_srates,
sizeof(audio->params.c_srates));
audio->params.c_ssize = audio_opts->c_ssize;
if (FUIN_EN(audio_opts)) {
audio->params.p_fu.id = USB_IN_FU_ID;
@ -1309,7 +1378,8 @@ static int f_audio_bind(struct usb_configuration *c, struct usb_function *f)
audio->params.p_fu.volume_res = audio_opts->p_volume_res;
}
audio->params.p_chmask = audio_opts->p_chmask;
audio->params.p_srates[0] = audio_opts->p_srate;
memcpy(audio->params.p_srates, audio_opts->p_srates,
sizeof(audio->params.p_srates));
audio->params.p_ssize = audio_opts->p_ssize;
if (FUOUT_EN(audio_opts)) {
audio->params.c_fu.id = USB_OUT_FU_ID;
@ -1414,11 +1484,70 @@ end: \
\
CONFIGFS_ATTR(f_uac1_opts_, name)
#define UAC1_RATE_ATTRIBUTE(name) \
static ssize_t f_uac1_opts_##name##_show(struct config_item *item, \
char *page) \
{ \
struct f_uac1_opts *opts = to_f_uac1_opts(item); \
int result = 0; \
int i; \
\
mutex_lock(&opts->lock); \
page[0] = '\0'; \
for (i = 0; i < UAC_MAX_RATES; i++) { \
if (opts->name##s[i] == 0) \
break; \
result += sprintf(page + strlen(page), "%u,", \
opts->name##s[i]); \
} \
if (strlen(page) > 0) \
page[strlen(page) - 1] = '\n'; \
mutex_unlock(&opts->lock); \
\
return result; \
} \
\
static ssize_t f_uac1_opts_##name##_store(struct config_item *item, \
const char *page, size_t len) \
{ \
struct f_uac1_opts *opts = to_f_uac1_opts(item); \
char *split_page = NULL; \
int ret = -EINVAL; \
char *token; \
u32 num; \
int i; \
\
mutex_lock(&opts->lock); \
if (opts->refcnt) { \
ret = -EBUSY; \
goto end; \
} \
\
i = 0; \
memset(opts->name##s, 0x00, sizeof(opts->name##s)); \
split_page = kstrdup(page, GFP_KERNEL); \
while ((token = strsep(&split_page, ",")) != NULL) { \
ret = kstrtou32(token, 0, &num); \
if (ret) \
goto end; \
\
opts->name##s[i++] = num; \
ret = len; \
}; \
\
end: \
kfree(split_page); \
mutex_unlock(&opts->lock); \
return ret; \
} \
\
CONFIGFS_ATTR(f_uac1_opts_, name)
UAC1_ATTRIBUTE(u32, c_chmask);
UAC1_ATTRIBUTE(u32, c_srate);
UAC1_RATE_ATTRIBUTE(c_srate);
UAC1_ATTRIBUTE(u32, c_ssize);
UAC1_ATTRIBUTE(u32, p_chmask);
UAC1_ATTRIBUTE(u32, p_srate);
UAC1_RATE_ATTRIBUTE(p_srate);
UAC1_ATTRIBUTE(u32, p_ssize);
UAC1_ATTRIBUTE(u32, req_number);
@ -1487,10 +1616,10 @@ static struct usb_function_instance *f_audio_alloc_inst(void)
&f_uac1_func_type);
opts->c_chmask = UAC1_DEF_CCHMASK;
opts->c_srate = UAC1_DEF_CSRATE;
opts->c_srates[0] = UAC1_DEF_CSRATE;
opts->c_ssize = UAC1_DEF_CSSIZE;
opts->p_chmask = UAC1_DEF_PCHMASK;
opts->p_srate = UAC1_DEF_PSRATE;
opts->p_srates[0] = UAC1_DEF_PSRATE;
opts->p_ssize = UAC1_DEF_PSSIZE;
opts->p_mute_present = UAC1_DEF_MUTE_PRESENT;

5
drivers/usb/gadget/function/u_uac1.h
View File

@ -9,6 +9,7 @@
#define __U_UAC1_H
#include <linux/usb/composite.h>
#include "uac_common.h"
#define UAC1_OUT_EP_MAX_PACKET_SIZE 200
#define UAC1_DEF_CCHMASK 0x3
@ -30,10 +31,10 @@
struct f_uac1_opts {
struct usb_function_instance func_inst;
int c_chmask;
int c_srate;
int c_srates[UAC_MAX_RATES];
int c_ssize;
int p_chmask;
int p_srate;
int p_srates[UAC_MAX_RATES];
int p_ssize;
bool p_mute_present;

25
drivers/usb/gadget/legacy/audio.c
View File

@ -61,9 +61,10 @@ module_param(p_chmask, uint, 0444);
MODULE_PARM_DESC(p_chmask, "Playback Channel Mask");
/* Playback Default 48 KHz */
static int p_srate = UAC1_DEF_PSRATE;
module_param(p_srate, uint, 0444);
MODULE_PARM_DESC(p_srate, "Playback Sampling Rate");
static int p_srates[UAC_MAX_RATES] = {UAC1_DEF_PSRATE};
static int p_srates_cnt = 1;
module_param_array_named(p_srate, p_srates, uint, &p_srates_cnt, 0444);
MODULE_PARM_DESC(p_srate, "Playback Sampling Rates (array)");
/* Playback Default 16bits/sample */
static int p_ssize = UAC1_DEF_PSSIZE;
@ -76,9 +77,10 @@ module_param(c_chmask, uint, 0444);
MODULE_PARM_DESC(c_chmask, "Capture Channel Mask");
/* Capture Default 48 KHz */
static int c_srate = UAC1_DEF_CSRATE;
module_param(c_srate, uint, 0444);
MODULE_PARM_DESC(c_srate, "Capture Sampling Rate");
static int c_srates[UAC_MAX_RATES] = {UAC1_DEF_CSRATE};
static int c_srates_cnt = 1;
module_param_array_named(c_srate, c_srates, uint, &c_srates_cnt, 0444);
MODULE_PARM_DESC(c_srate, "Capture Sampling Rates (array)");
/* Capture Default 16bits/sample */
static int c_ssize = UAC1_DEF_CSSIZE;
@ -243,6 +245,7 @@ static int audio_bind(struct usb_composite_dev *cdev)
#else
#ifndef CONFIG_GADGET_UAC1_LEGACY
struct f_uac1_opts *uac1_opts;
int i;
#else
struct f_uac1_legacy_opts *uac1_opts;
#endif
@ -282,10 +285,16 @@ static int audio_bind(struct usb_composite_dev *cdev)
#ifndef CONFIG_GADGET_UAC1_LEGACY
uac1_opts = container_of(fi_uac1, struct f_uac1_opts, func_inst);
uac1_opts->p_chmask = p_chmask;
uac1_opts->p_srate = p_srate;
for (i = 0; i < p_srates_cnt; ++i)
uac1_opts->p_srates[i] = p_srates[i];
uac1_opts->p_ssize = p_ssize;
uac1_opts->c_chmask = c_chmask;
uac1_opts->c_srate = c_srate;
for (i = 0; i < c_srates_cnt; ++i)
uac1_opts->c_srates[i] = c_srates[i];
uac1_opts->c_ssize = c_ssize;
uac1_opts->req_number = UAC1_DEF_REQ_NUM;
#else /* CONFIG_GADGET_UAC1_LEGACY */