On 2012/9/5 0:15, Alan Stern wrote:
On Mon, 3 Sep 2012, Lan Tianyu wrote:
ACPI provide "_PLD" and "_UPC" aml methods to describe usb port
visibility and connectability. This patch is to use those information
to set usb port's DeviceRemovable.
Signed-off-by: Lan Tianyu <tianyu....@intel.com>
---
v2: Set DeviceRemovable according acpi infomation in the hub_configure()
instead of calling get_hub_descriptor().
@@ -1566,6 +1566,25 @@ static int hub_configure(struct usb_hub *hub,
dev_err(hub->intfdev,
"couldn't create port%d device.\n", i + 1);
+ if (hub_is_superspeed(hdev)) {
+ for (i = 1; i <= hdev->maxchild; i++)
+ if (hub->ports[i - 1]->connect_type
+ == USB_PORT_CONNECT_TYPE_HARD_WIRED)
+ hub->descriptor->u.hs.DeviceRemovable[i/8]
+ |= 1 << (i%8);
+ } else {
+ u16 port_removable = 0;
+
+ for (i = i; i <= hdev->maxchild; i++)
+ if (hub->ports[i - 1]->connect_type
+ == USB_PORT_CONNECT_TYPE_HARD_WIRED)
+ port_removable |= 1 << i;
+
+ memset(&hub->descriptor->u.ss.DeviceRemovable,
+ (__force __u16) cpu_to_le16(port_removable),
+ sizeof(__u16));
Use put_unaligned_le16() instead of memset, if you're worried about
alignment.
This is copied from xhci_usb3_hub_descriptor().
struct usb_hub_descriptor {
__u8 bDescLength;
__u8 bDescriptorType;
__u8 bNbrPorts;
__le16 wHubCharacteristics;
__u8 bPwrOn2PwrGood;
__u8 bHubContrCurrent;
/* 2.0 and 3.0 hubs differ here */
union {
struct {
/* add 1 bit for hub status change; round to bytes */
__u8 DeviceRemovable[(USB_MAXCHILDREN + 1 + 7) / 8];
__u8 PortPwrCtrlMask[(USB_MAXCHILDREN + 1 + 7) / 8];
} __attribute__ ((packed)) hs;
struct {
__u8 bHubHdrDecLat;
__u16 wHubDelay;
__u16 DeviceRemovable;
} __attribute__ ((packed)) ss;
} u;
} __attribute__ ((packed));
The struct has been defined with __attribute__ ((packed)). So there is
no alignment problem. Or we can
hub->descriptor->u.ss.DeviceRemovable = (__force __u16)
cpu_to_le16(port_removable);
I think we also should define wHubDelay and DeviceRemovable as __le16
for ss since they are little-endian order, right?
This isn't right, because you overwrite information provided by the hub
with what ACPI says, even if ACPI doesn't say anything. You should
initialize port_removable to the original value of
u.ss.DeviceRemovable, not to 0.
OK. I get it.
Alan Stern
--
Best Regards
Tianyu Lan
linux kernel enabling team
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