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usb: gadget: configfs: Add max_speed setting

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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: Thinh Nguyen <thinhn@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Greg 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: Jack Pham <jackp@codeaurora.org>
This commit is contained in:
Thinh Nguyen
2020-01-08 18:38:10 -08:00
committed by Jack Pham
parent 4abb83b709
commit 07731aa5e8
2 changed files with 47 additions and 0 deletions
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4
Documentation/ABI/testing/configfs-usb-gadget
View File

@ -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

43
drivers/usb/gadget/configfs.c
View File

@ -325,6 +325,47 @@ err:
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,
};