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Commit 07731aa5 authored by Thinh Nguyen's avatar Thinh Nguyen Committed by Jack Pham
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usb: gadget: configfs: Add max_speed setting 



Some functions support speeds other than SuperSpeed. Add max_speed
attribute to configfs gadget allowing user to specify the maximum speed
the composite driver supports. The valid input speed names are
super-speed-plus, super-speed, high-speed, full-speed, and low-speed.

Signed-off-by: default avatarThinh Nguyen <thinhn@synopsys.com>
Signed-off-by: default avatarFelipe Balbi <balbi@kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Change-Id: I88aa2bee62da8af902954015437eaf9e7a158b27
Git-commit: a02497033e8e04c30501abb78c92d862982b9912
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


[jackp@codeaurora.org: sprintf -> scnprintf to placate Cocci]
Signed-off-by: default avatarJack Pham <jackp@codeaurora.org>
parent 4abb83b7

Documentation/ABI/testing/configfs-usb-gadget

+4 −0
Original line number Diff line number Diff line
@@ -16,6 +16,10 @@ Description: 
				write UDC's name found in /sys/class/udc/*

				to bind a gadget, empty string "" to unbind.



		max_speed	- maximum speed the driver supports. Valid

				names are super-speed-plus, super-speed,

				high-speed, full-speed, and low-speed.



		bDeviceClass	- USB device class code

		bDeviceSubClass	- USB device subclass code

		bDeviceProtocol	- USB device protocol code

drivers/usb/gadget/configfs.c

+43 −0
Original line number Diff line number Diff line
@@ -325,6 +325,47 @@ static ssize_t gadget_dev_desc_UDC_store(struct config_item *item, 
	return ret;

}



static ssize_t gadget_dev_desc_max_speed_show(struct config_item *item,

					      char *page)

{

	enum usb_device_speed speed = to_gadget_info(item)->composite.max_speed;



	return scnprintf(page, PAGE_SIZE, "%s\n", usb_speed_string(speed));

}



static ssize_t gadget_dev_desc_max_speed_store(struct config_item *item,

					       const char *page, size_t len)

{

	struct gadget_info *gi = to_gadget_info(item);



	mutex_lock(&gi->lock);



	/* Prevent changing of max_speed after the driver is binded */

	if (gi->composite.gadget_driver.udc_name)

		goto err;



	if (strncmp(page, "super-speed-plus", 16) == 0)

		gi->composite.max_speed = USB_SPEED_SUPER_PLUS;

	else if (strncmp(page, "super-speed", 11) == 0)

		gi->composite.max_speed = USB_SPEED_SUPER;

	else if (strncmp(page, "high-speed", 10) == 0)

		gi->composite.max_speed = USB_SPEED_HIGH;

	else if (strncmp(page, "full-speed", 10) == 0)

		gi->composite.max_speed = USB_SPEED_FULL;

	else if (strncmp(page, "low-speed", 9) == 0)

		gi->composite.max_speed = USB_SPEED_LOW;

	else

		goto err;



	gi->composite.gadget_driver.max_speed = gi->composite.max_speed;



	mutex_unlock(&gi->lock);

	return len;

err:

	mutex_unlock(&gi->lock);

	return -EINVAL;

}



CONFIGFS_ATTR(gadget_dev_desc_, bDeviceClass);

CONFIGFS_ATTR(gadget_dev_desc_, bDeviceSubClass);

CONFIGFS_ATTR(gadget_dev_desc_, bDeviceProtocol);
@@ -334,6 +375,7 @@ CONFIGFS_ATTR(gadget_dev_desc_, idProduct); 
CONFIGFS_ATTR(gadget_dev_desc_, bcdDevice);

CONFIGFS_ATTR(gadget_dev_desc_, bcdUSB);

CONFIGFS_ATTR(gadget_dev_desc_, UDC);

CONFIGFS_ATTR(gadget_dev_desc_, max_speed);



static struct configfs_attribute *gadget_root_attrs[] = {

	&gadget_dev_desc_attr_bDeviceClass,
@@ -345,6 +387,7 @@ static struct configfs_attribute *gadget_root_attrs[] = { 
	&gadget_dev_desc_attr_bcdDevice,

	&gadget_dev_desc_attr_bcdUSB,

	&gadget_dev_desc_attr_UDC,

	&gadget_dev_desc_attr_max_speed,

	NULL,

};