libusbhost: Add usb_device_connect_kernel_driver()
This can be used to ask the kernel to disconnect its driver for a device
so usb_device_claim_interface() can claim it instead.
Also increased size of descriptor buffer and added some debugging logs
Change-Id: I4945196d957fb8493716eb9b7e5463c06b168ef1
Signed-off-by: Mike Lockwood <lockwood@android.com>
diff --git a/libusbhost/usbhost.c b/libusbhost/usbhost.c
index d6736d3..89a7f0a 100644
--- a/libusbhost/usbhost.c
+++ b/libusbhost/usbhost.c
@@ -60,7 +60,7 @@
struct usb_device {
char dev_name[64];
- unsigned char desc[256];
+ unsigned char desc[4096];
int desc_length;
int fd;
int writeable;
@@ -204,6 +204,8 @@
{
int fd, did_retry = 0, writeable = 1;
+ D("usb_device_open %s\n", dev_name);
+
retry:
fd = open(dev_name, O_RDWR);
if (fd < 0) {
@@ -240,10 +242,12 @@
struct usb_device *device = calloc(1, sizeof(struct usb_device));
int length;
+ D("usb_device_new %s fd: %d\n", dev_name, fd);
+
if (lseek(fd, 0, SEEK_SET) != 0)
goto failed;
length = read(fd, device->desc, sizeof(device->desc));
- D("usb_device_new read returned %d errno %d\n", fd, errno);
+ D("usb_device_new read returned %d errno %d\n", length, errno);
if (length < 0)
goto failed;
@@ -452,6 +456,17 @@
return ioctl(device->fd, USBDEVFS_RELEASEINTERFACE, &interface);
}
+int usb_device_connect_kernel_driver(struct usb_device *device,
+ unsigned int interface, int connect)
+{
+ struct usbdevfs_ioctl ctl;
+
+ ctl.ifno = interface;
+ ctl.ioctl_code = (connect ? USBDEVFS_CONNECT : USBDEVFS_DISCONNECT);
+ ctl.data = NULL;
+ return ioctl(device->fd, USBDEVFS_IOCTL, &ctl);
+}
+
struct usb_request *usb_request_new(struct usb_device *dev,
const struct usb_endpoint_descriptor *ep_desc)
{