Add a configfs entry, "function_name", to change the iInterface field for VideoControl. This name is used on host devices for user selection, useful when multiple cameras are present. The default will remain "UVC Camera".

Cc: stable@vger.kernel.org # 5.10+ Signed-off-by: Dan Vacura w36195@motorola.com --- .../ABI/testing/configfs-usb-gadget-uvc | 1 + Documentation/usb/gadget-testing.rst | 1 + drivers/usb/gadget/function/f_uvc.c | 4 +- drivers/usb/gadget/function/u_uvc.h | 1 + drivers/usb/gadget/function/uvc_configfs.c | 41 +++++++++++++++++++ 5 files changed, 47 insertions(+), 1 deletion(-)

diff --git a/Documentation/ABI/testing/configfs-usb-gadget-uvc b/Documentation/ABI/testing/configfs-usb-gadget-uvc index 889ed45be4ca..611b23e6488d 100644 --- a/Documentation/ABI/testing/configfs-usb-gadget-uvc +++ b/Documentation/ABI/testing/configfs-usb-gadget-uvc @@ -7,6 +7,7 @@ Description: UVC function directory streaming_maxburst 0..15 (ss only) streaming_maxpacket 1..1023 (fs), 1..3072 (hs/ss) streaming_interval 1..16 + function_name string [32] =================== =============================

What: /config/usb-gadget/gadget/functions/uvc.name/control diff --git a/Documentation/usb/gadget-testing.rst b/Documentation/usb/gadget-testing.rst index c6d034abce3a..1c37159fa171 100644 --- a/Documentation/usb/gadget-testing.rst +++ b/Documentation/usb/gadget-testing.rst @@ -787,6 +787,7 @@ The uvc function provides these attributes in its function directory: streaming_maxpacket maximum packet size this endpoint is capable of sending or receiving when this configuration is selected + function_name name of the interface =================== ================================================

There are also "control" and "streaming" subdirectories, each of which contain diff --git a/drivers/usb/gadget/function/f_uvc.c b/drivers/usb/gadget/function/f_uvc.c index 71bb5e477dba..50e6e7a58b41 100644 --- a/drivers/usb/gadget/function/f_uvc.c +++ b/drivers/usb/gadget/function/f_uvc.c @@ -44,7 +44,7 @@ MODULE_PARM_DESC(trace, "Trace level bitmask"); #define UVC_STRING_STREAMING_IDX 1

static struct usb_string uvc_en_us_strings[] = { - [UVC_STRING_CONTROL_IDX].s = "UVC Camera", + /* [UVC_STRING_CONTROL_IDX].s = DYNAMIC, */ [UVC_STRING_STREAMING_IDX].s = "Video Streaming", { } }; @@ -676,6 +676,7 @@ uvc_function_bind(struct usb_configuration *c, struct usb_function *f) uvc_hs_streaming_ep.bEndpointAddress = uvc->video.ep->address; uvc_ss_streaming_ep.bEndpointAddress = uvc->video.ep->address;

+ uvc_en_us_strings[UVC_STRING_CONTROL_IDX].s = opts->function_name; us = usb_gstrings_attach(cdev, uvc_function_strings, ARRAY_SIZE(uvc_en_us_strings)); if (IS_ERR(us)) { @@ -866,6 +867,7 @@ static struct usb_function_instance *uvc_alloc_inst(void)

opts->streaming_interval = 1; opts->streaming_maxpacket = 1024; + snprintf(opts->function_name, sizeof(opts->function_name), "UVC Camera");

ret = uvcg_attach_configfs(opts); if (ret < 0) { diff --git a/drivers/usb/gadget/function/u_uvc.h b/drivers/usb/gadget/function/u_uvc.h index 9a01a7d4f17f..24b8681b0d6f 100644 --- a/drivers/usb/gadget/function/u_uvc.h +++ b/drivers/usb/gadget/function/u_uvc.h @@ -27,6 +27,7 @@ struct f_uvc_opts {

unsigned int control_interface; unsigned int streaming_interface; + char function_name[32];

/* * Control descriptors array pointers for full-/high-speed and diff --git a/drivers/usb/gadget/function/uvc_configfs.c b/drivers/usb/gadget/function/uvc_configfs.c index 77d64031aa9c..63b8d3758b38 100644 --- a/drivers/usb/gadget/function/uvc_configfs.c +++ b/drivers/usb/gadget/function/uvc_configfs.c @@ -2425,10 +2425,51 @@ UVCG_OPTS_ATTR(streaming_maxburst, streaming_maxburst, 15);

#undef UVCG_OPTS_ATTR

+#define UVCG_OPTS_STRING_ATTR(cname, aname) \ +static ssize_t f_uvc_opts_string_##cname##_show(struct config_item *item,\ + char *page) \ +{ \ + struct f_uvc_opts *opts = to_f_uvc_opts(item); \ + int result; \ + \ + mutex_lock(&opts->lock); \ + result = snprintf(page, sizeof(opts->aname), "%s", opts->aname);\ + mutex_unlock(&opts->lock); \ + \ + return result; \ +} \ + \ +static ssize_t f_uvc_opts_string_##cname##_store(struct config_item *item,\ + const char *page, size_t len) \ +{ \ + struct f_uvc_opts *opts = to_f_uvc_opts(item); \ + int ret = 0; \ + \ + mutex_lock(&opts->lock); \ + if (opts->refcnt) { \ + ret = -EBUSY; \ + goto end; \ + } \ + \ + ret = snprintf(opts->aname, min(sizeof(opts->aname), len), \ + "%s", page); \ + \ +end: \ + mutex_unlock(&opts->lock); \ + return ret; \ +} \ + \ +UVC_ATTR(f_uvc_opts_string_, cname, aname) + +UVCG_OPTS_STRING_ATTR(function_name, function_name); + +#undef UVCG_OPTS_STRING_ATTR + static struct configfs_attribute *uvc_attrs[] = { &f_uvc_opts_attr_streaming_interval, &f_uvc_opts_attr_streaming_maxpacket, &f_uvc_opts_attr_streaming_maxburst, + &f_uvc_opts_string_attr_function_name, NULL, };