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usb: gadget: f_loopback: add configfs support

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Add support for using the loopback USB function in gadgets composed with
configfs.

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Andrzej Pietrasiewicz
2013-11-07 08:41:27 +01:00
committed by Felipe Balbi
parent 1efd54eab2
commit c0501f47c6
5 changed files with 166 additions and 2 deletions
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12
drivers/usb/gadget/g_zero.h
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@@ -6,6 +6,9 @@
#ifndef __G_ZERO_H
#define __G_ZERO_H
#define GZERO_BULK_BUFLEN 4096
#define GZERO_QLEN 32
struct usb_zero_options {
unsigned pattern;
unsigned isoc_interval;
@@ -30,6 +33,15 @@ struct f_lb_opts {
struct usb_function_instance func_inst;
unsigned bulk_buflen;
unsigned qlen;
/*
* Read/write access to configfs attributes is handled by configfs.
*
* This is to protect the data from concurrent access by read/write
* and create symlink/remove symlink.
*/
struct mutex lock;
int refcnt;
};
void lb_modexit(void);