linux.git/drivers/usb/gadget/function/f_uvc.c, branch v4.0

usb: gadget: uvc: configfs support in uvc function

2015-01-12T18:13:26+00:00

Add support for using the uvc function as a component of USB gadgets composed
with configfs.

Acked-by: Laurent Pinchart 
Signed-off-by: Andrzej Pietrasiewicz 
Signed-off-by: Felipe Balbi

usb: gadget: uvc: verify descriptors presence

2015-01-12T18:13:26+00:00

If the caller of uvc_alloc() does not provide enough
descriptors, binding the function should fail, so appropriate
code is returned from uvc_copy_descriptors().

uvc_function_bind() is modified accordingly to account for possible
errors from uvc_copy_descriptors().

Signed-off-by: Andrzej Pietrasiewicz 
Acked-by: Laurent Pinchart 
Signed-off-by: Felipe Balbi

usb: gadget: f_uvc: rename a macro to avoid conflicts

2015-01-12T18:13:26+00:00

When configfs is integrated, CONFIGFS_ATTR_STRUCT and CONFIGFS_ATTR_OPS
macros should be used, but the latter expects that tere is a to_f_uvc_opts
function accepting a config_item, whereas the macro being changed
can be applied to a different type of argument.

Signed-off-by: Andrzej Pietrasiewicz 
Acked-by: Laurent Pinchart 
Signed-off-by: Felipe Balbi

usb: gadget: function: uvc: disable endpoints on ->disable()

2014-10-20T20:58:48+00:00

when our ->disable() method is called, we must
make sure to teardown all our resources, including
endpoints.

Signed-off-by: Felipe Balbi

usb: gadget: function: uvc: manage our video control endpoint

2014-10-20T20:58:48+00:00

just like any other endpoint, we must enable/disable
our video control endpoint based on calls to our
->set_alt() method.

Signed-off-by: Felipe Balbi

usb: gadget: function: uvc: return correct alt-setting

2014-10-20T20:58:48+00:00

If our alternate setting has been selected, we must
return that on a subsequent Get Interface request
even if we're not streaming.

Signed-off-by: Felipe Balbi

usb: gadget: function: uvc: make sure to balance ep enable/disable

2014-10-20T20:58:48+00:00

If a set_alt() to the same alternate setting that's
already selected is received, functions are required
to reset the interface state, this means we must disable
all endpoints and reenable them again.

This is also documented on our kdoc for struct usb_function

* @set_alt: (REQUIRED) Reconfigures altsettings; function drivers may
*	initialize usb_ep.driver data at this time (when it is used).
*	Note that setting an interface to its current altsetting resets
*	interface state, and that all interfaces have a disabled state.

Signed-off-by: Felipe Balbi

usb: gadget: uvc: Fix endianness mismatches

2014-09-16T14:59:47+00:00

The struct usb_endpoint_descriptor wMaxPacketSize field the struct
usb_ss_ep_comp_descriptor wBytesPerInterval field are stored in
little-endian format. Convert the values from CPU order to little endian
before storing the values.

Signed-off-by: Laurent Pinchart 
Signed-off-by: Felipe Balbi

usb: gadget: uvc: uvc_alloc() can be static

2014-09-16T14:58:52+00:00

The function isn't called from outside of its compilation unit, make it
static.

Signed-off-by: Fengguang Wu 
Acked-by: Andrzej Pietrasiewicz 
Signed-off-by: Laurent Pinchart 
Signed-off-by: Felipe Balbi

usb: gadget: f_uvc: use usb_gstrings_attach

2014-09-09T14:49:44+00:00

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 
Tested-by: Michael Grzeschik 
Signed-off-by: Laurent Pinchart 
Signed-off-by: Felipe Balbi