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usb: make usb descriptor power options configurable

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Add two new kconfig options USB_SELF_POWERED and USB_MAX_POWER.
These can be set by the user to change the USB configuration descriptor.
USB_MAX_POWER can be set to any value between 0 and 250, but practically
should be 50 or 250. These values are half the ammount of mA that the
device will tell the host that it needs.
USB_SELF_POWERED sets the 7th bit in bmAttributes of the USB config
descriptor. Should be set to y if the device has its own power source
other than USB.

Signed-off-by: Barry Solomon <barry.solomon@dexcom.com>
This commit is contained in:
Barry Solomon 2019-12-17 14:58:27 -05:00 • committed by Anas Nashif
commit 6118ca2785
4 changed files with 24 additions and 11 deletions
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16
include/usb/usb_common.h
View file

@ -86,11 +86,6 @@
#define BCDDEVICE_RELNUM (BCD(KERNEL_VERSION_MAJOR) << 8 | \
BCD(KERNEL_VERSION_MINOR))
/* 100mA max power, per 2mA units */
/* USB 1.1 spec indicates 100mA(max) per unit load, up to 5 loads */
#define MAX_LOW_POWER 0x32
#define MAX_HIGH_POWER 0xFA
/* Highest value of Frame Number in SOF packets. */
#define USB_SOF_MAX 2047
@ -100,10 +95,13 @@
* D5:Remote Wakeup -> 0,
* D4...0:Reserved -> 0
*/
#define USB_CONFIGURATION_ATTRIBUTES_REMOTE_WAKEUP 0x20
#define USB_CONFIGURATION_ATTRIBUTES 0xC0 \
| (COND_CODE_1(CONFIG_USB_DEVICE_REMOTE_WAKEUP, \
(USB_CONFIGURATION_ATTRIBUTES_REMOTE_WAKEUP), (0)))
#define USB_CONFIGURATION_ATTRIBUTES_REMOTE_WAKEUP BIT(5)
#define USB_CONFIGURATION_ATTRIBUTES_SELF_POWERED BIT(6)
#define USB_CONFIGURATION_ATTRIBUTES BIT(7) \
| ((COND_CODE_1(CONFIG_USB_SELF_POWERED, \
(USB_CONFIGURATION_ATTRIBUTES_SELF_POWERED), (0))) \
| (COND_CODE_1(CONFIG_USB_DEVICE_REMOTE_WAKEUP, \
(USB_CONFIGURATION_ATTRIBUTES_REMOTE_WAKEUP), (0))))
/* Classes */
#define COMMUNICATION_DEVICE_CLASS 0x02

15
subsys/usb/Kconfig
View file

@ -90,6 +90,21 @@ config USB_DEVICE_BOS
config USB_DEVICE_OS_DESC
bool "Enable MS OS Descriptors support"
config USB_SELF_POWERED
bool "Set Self-powered characteristic"
default y
help
Set Self-powered characteristic in bmAttributes to indicate
self powered USB device.
config USB_MAX_POWER
int "Set bMaxPower value"
default 50
range 0 250
help
Set bMaxPower value in the Standard Configuration Descriptor,
the result is 2mA times the value provided.
menuconfig USB_VBUS_GPIO
bool "Control VBUS via GPIO pin"
depends on GPIO

2
subsys/usb/class/usb_dfu.c
View file

@ -156,7 +156,7 @@ struct dev_dfu_mode_descriptor dfu_mode_desc = {
.bConfigurationValue = 1,
.iConfiguration = 0,
.bmAttributes = USB_CONFIGURATION_ATTRIBUTES,
.bMaxPower = MAX_LOW_POWER,
.bMaxPower = CONFIG_USB_MAX_POWER,
},
.sec_dfu_cfg = {
/* Interface descriptor */

2
subsys/usb/usb_descriptor.c
View file

@ -89,7 +89,7 @@ USBD_DEVICE_DESCR_DEFINE(primary) struct common_descriptor common_desc = {
.bConfigurationValue = 1,
.iConfiguration = 0,
.bmAttributes = USB_CONFIGURATION_ATTRIBUTES,
.bMaxPower = MAX_LOW_POWER,
.bMaxPower = CONFIG_USB_MAX_POWER,
},
};