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Message-Id: <20220331211155.412906-1-w36195@motorola.com>
Date: Thu, 31 Mar 2022 16:11:50 -0500
From: Dan Vacura <w36195@...orola.com>
To: linux-usb@...r.kernel.org
Cc: Dan Vacura <w36195@...orola.com>, stable@...r.kernel.org,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Jonathan Corbet <corbet@....net>,
Laurent Pinchart <laurent.pinchart@...asonboard.com>,
Felipe Balbi <balbi@...nel.org>,
Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
Carlos Bilbao <bilbao@...edu>,
Randy Dunlap <rdunlap@...radead.org>,
linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org
Subject: [PATCH] usb: gadget: uvc: allow changing interface name via configfs
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@...r.kernel.org> # 5.10+
Signed-off-by: Dan Vacura <w36195@...orola.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,
};
--
2.32.0
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