Attach strings to gadget with usb_strings_attach.
It is required for correct instantiation of functions more than once:
instead of modifying the local uvc_en_us_strings a function instance
specific copy is created with usb_gstrings_attach.
Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@xxxxxxxxxxx>
---
drivers/usb/gadget/function/f_uvc.c | 28 +++++++++++-----------------
1 file changed, 11 insertions(+), 17 deletions(-)
diff --git a/drivers/usb/gadget/function/f_uvc.c b/drivers/usb/gadget/function/f_uvc.c
index 5789828..ff7ee02 100644
--- a/drivers/usb/gadget/function/f_uvc.c
+++ b/drivers/usb/gadget/function/f_uvc.c
@@ -554,6 +554,7 @@ uvc_function_bind(struct usb_configuration *c, struct usb_function *f)
{
struct usb_composite_dev *cdev = c->cdev;
struct uvc_device *uvc = to_uvc(f);
+ struct usb_string *us;
unsigned int max_packet_mult;
unsigned int max_packet_size;
struct usb_ep *ep;
@@ -629,22 +630,17 @@ 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;
- /* String descriptors are global, we only need to allocate string IDs
- * for the first UVC function. UVC functions beyond the first (if any)
- * will reuse the same IDs.
- */
- if (uvc_en_us_strings[UVC_STRING_CONTROL_IDX].id == 0) {
- ret = usb_string_ids_tab(c->cdev, uvc_en_us_strings);
- if (ret)
- goto error;
- uvc_iad.iFunction =
- uvc_en_us_strings[UVC_STRING_CONTROL_IDX].id;
- uvc_control_intf.iInterface =
- uvc_en_us_strings[UVC_STRING_CONTROL_IDX].id;
- ret = uvc_en_us_strings[UVC_STRING_STREAMING_IDX].id;
- uvc_streaming_intf_alt0.iInterface = ret;
- uvc_streaming_intf_alt1.iInterface = ret;
+ us = usb_gstrings_attach(cdev, uvc_function_strings,
+ ARRAY_SIZE(uvc_en_us_strings));
+ if (IS_ERR(us)) {
+ ret = PTR_ERR(us);
+ goto error;
}
+ uvc_iad.iFunction = us[UVC_STRING_CONTROL_IDX].id;
+ uvc_control_intf.iInterface = us[UVC_STRING_CONTROL_IDX].id;
+ ret = us[UVC_STRING_STREAMING_IDX].id;
+ uvc_streaming_intf_alt0.iInterface = ret;
+ uvc_streaming_intf_alt1.iInterface = ret;
/* Allocate interface IDs. */
if ((ret = usb_interface_id(c, f)) < 0)
@@ -763,7 +759,6 @@ static void uvc_unbind(struct usb_configuration *c, struct usb_function *f)
uvc->control_ep->driver_data = NULL;
uvc->video.ep->driver_data = NULL;
- uvc_en_us_strings[UVC_STRING_CONTROL_IDX].id = 0;
usb_ep_free_request(cdev->gadget->ep0, uvc->control_req);
kfree(uvc->control_buf);
@@ -790,7 +785,6 @@ struct usb_function *uvc_alloc(struct usb_function_instance *fi)
/* Register the function. */
uvc->func.name = "uvc";
- uvc->func.strings = uvc_function_strings;
uvc->func.bind = uvc_function_bind;
uvc->func.unbind = uvc_unbind;
uvc->func.get_alt = uvc_function_get_alt;
--
1.9.1
--
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