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authorDavid Brownell <david-b@pacbell.net>2008-02-10 12:24:00 -0800
committerGreg Kroah-Hartman <gregkh@suse.de>2008-04-24 21:16:34 -0700
commitdbe0dbb7dfda52140d3469d7035a08dfa874fca2 (patch)
treefca93c36c284a789f607e559f3f9e8d6df1dff9e /drivers/usb
parentc4504a7eb9c4c491e6f31b28169dd49e9bacc8ec (diff)
USB: defines for USB "Link Power Management" (LPM) ECN
There's a new PM-related change notice for the USB 2.0 specification called "Link Power Management" (LPM). It defines a new "L1 Suspend" state which resembles the current (L2) suspend state, except that it can be entered and exited much more quickly. It should thus be more useful for runtime PM, even though it doesn't mandate reduced power draw from VBUS. This patch provides the relevant #defines for usbcore. Actually implementing these mechanisms requires host silicon that can generate new USB packets, plus hubs handling some new requests and peripherals which understand the new packets. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/core/hcd.h2
-rw-r--r--drivers/usb/core/hub.h8
2 files changed, 7 insertions, 3 deletions
diff --git a/drivers/usb/core/hcd.h b/drivers/usb/core/hcd.h
index 2d1c3d5e47b..2c086b8460b 100644
--- a/drivers/usb/core/hcd.h
+++ b/drivers/usb/core/hcd.h
@@ -28,7 +28,7 @@
/*
* USB Packet IDs (PIDs)
*/
-#define USB_PID_UNDEF_0 0xf0
+#define USB_PID_EXT 0xf0 /* USB 2.0 LPM ECN */
#define USB_PID_OUT 0xe1
#define USB_PID_ACK 0xd2
#define USB_PID_DATA0 0xc3
diff --git a/drivers/usb/core/hub.h b/drivers/usb/core/hub.h
index 1551aed65e0..d672cd81a3e 100644
--- a/drivers/usb/core/hub.h
+++ b/drivers/usb/core/hub.h
@@ -41,9 +41,10 @@
*/
#define USB_PORT_FEAT_CONNECTION 0
#define USB_PORT_FEAT_ENABLE 1
-#define USB_PORT_FEAT_SUSPEND 2
+#define USB_PORT_FEAT_SUSPEND 2 /* L2 suspend */
#define USB_PORT_FEAT_OVER_CURRENT 3
#define USB_PORT_FEAT_RESET 4
+#define USB_PORT_FEAT_L1 5 /* L1 suspend */
#define USB_PORT_FEAT_POWER 8
#define USB_PORT_FEAT_LOWSPEED 9
#define USB_PORT_FEAT_HIGHSPEED 10
@@ -54,6 +55,7 @@
#define USB_PORT_FEAT_C_RESET 20
#define USB_PORT_FEAT_TEST 21
#define USB_PORT_FEAT_INDICATOR 22
+#define USB_PORT_FEAT_C_PORT_L1 23
/*
* Hub Status and Hub Change results
@@ -73,7 +75,8 @@ struct usb_port_status {
#define USB_PORT_STAT_SUSPEND 0x0004
#define USB_PORT_STAT_OVERCURRENT 0x0008
#define USB_PORT_STAT_RESET 0x0010
-/* bits 5 to 7 are reserved */
+#define USB_PORT_STAT_L1 0x0020
+/* bits 6 to 7 are reserved */
#define USB_PORT_STAT_POWER 0x0100
#define USB_PORT_STAT_LOW_SPEED 0x0200
#define USB_PORT_STAT_HIGH_SPEED 0x0400
@@ -91,6 +94,7 @@ struct usb_port_status {
#define USB_PORT_STAT_C_SUSPEND 0x0004
#define USB_PORT_STAT_C_OVERCURRENT 0x0008
#define USB_PORT_STAT_C_RESET 0x0010
+#define USB_PORT_STAT_C_L1 0x0020
/*
* wHubCharacteristics (masks)