*
*/
-#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/module.h>
{
int port1;
unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2;
- u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
-
- /* if hub supports power switching, enable power on each port */
- if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2) {
+ u16 wHubCharacteristics =
+ le16_to_cpu(hub->descriptor->wHubCharacteristics);
+
+ /* Enable power on each port. Some hubs have reserved values
+ * of LPSM (> 2) in their descriptors, even though they are
+ * USB 2.0 hubs. Some hubs do not implement port-power switching
+ * but only emulate it. In all cases, the ports won't work
+ * unless we send these messages to the hub.
+ */
+ if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2)
dev_dbg(hub->intfdev, "enabling power on all ports\n");
- for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++)
- set_port_feature(hub->hdev, port1,
- USB_PORT_FEAT_POWER);
- }
+ else
+ dev_dbg(hub->intfdev, "trying to enable port power on "
+ "non-switchable hub\n");
+ for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++)
+ set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER);
/* Wait at least 100 msec for power to become stable */
msleep(max(pgood_delay, (unsigned) 100));
/* caller has locked the hub device */
-static void hub_pre_reset(struct usb_hub *hub, int disable_ports)
+static void hub_pre_reset(struct usb_interface *intf)
{
+ struct usb_hub *hub = usb_get_intfdata(intf);
struct usb_device *hdev = hub->hdev;
int port1;
for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
if (hdev->children[port1 - 1]) {
usb_disconnect(&hdev->children[port1 - 1]);
- if (disable_ports)
+ if (hub->error == 0)
hub_port_disable(hub, port1, 0);
}
}
}
/* caller has locked the hub device */
-static void hub_post_reset(struct usb_hub *hub)
+static void hub_post_reset(struct usb_interface *intf)
{
+ struct usb_hub *hub = usb_get_intfdata(intf);
+
hub_activate(hub);
hub_power_on(hub);
}
struct usb_hub *hub = usb_get_intfdata (intf);
struct usb_device *hdev;
+ /* Disconnect all children and quiesce the hub */
+ hub->error = 0;
+ hub_pre_reset(intf);
+
usb_set_intfdata (intf, NULL);
hdev = hub->hdev;
if (hdev->speed == USB_SPEED_HIGH)
highspeed_hubs--;
- /* Disconnect all children and quiesce the hub */
- hub_pre_reset(hub, 1);
-
usb_free_urb(hub->urb);
hub->urb = NULL;
{
int i;
int num_configs;
+ int insufficient_power = 0;
struct usb_host_config *c, *best;
best = NULL;
*/
/* Rule out configs that draw too much bus current */
- if (c->desc.bMaxPower * 2 > udev->bus_mA)
+ if (c->desc.bMaxPower * 2 > udev->bus_mA) {
+ insufficient_power++;
continue;
+ }
/* If the first config's first interface is COMM/2/0xff
* (MSFT RNDIS), rule it out unless Linux has host-side
&& desc->bInterfaceClass == USB_CLASS_COMM
&& desc->bInterfaceSubClass == 2
&& desc->bInterfaceProtocol == 0xff) {
-#ifndef CONFIG_USB_NET_RNDIS
+#ifndef CONFIG_USB_NET_RNDIS_HOST
continue;
#else
best = c;
best = c;
}
+ if (insufficient_power > 0)
+ dev_info(&udev->dev, "rejected %d configuration%s "
+ "due to insufficient available bus power\n",
+ insufficient_power, plural(insufficient_power));
+
if (best) {
i = best->desc.bConfigurationValue;
dev_info(&udev->dev,
* (Includes HNP test device.)
*/
if (udev->bus->b_hnp_enable || udev->bus->is_b_host) {
- static int __usb_suspend_device(struct usb_device *,
+ static int __usb_port_suspend(struct usb_device *,
int port1);
- err = __usb_suspend_device(udev, udev->bus->otg_port);
+ err = __usb_port_suspend(udev, udev->bus->otg_port);
if (err < 0)
dev_dbg(&udev->dev, "HNP fail, %d\n", err);
}
* the root hub for their bus goes into global suspend ... so we don't
* (falsely) update the device power state to say it suspended.
*/
-static int __usb_suspend_device (struct usb_device *udev, int port1)
+static int __usb_port_suspend (struct usb_device *udev, int port1)
{
int status = 0;
}
}
- /* we only change a device's upstream USB link.
- * root hubs have no upstream USB link.
+ /* we change the device's upstream USB link,
+ * but root hubs have no upstream USB link.
*/
if (udev->parent)
status = hub_port_suspend(hdev_to_hub(udev->parent), port1,
#endif
/*
- * usb_suspend_device - suspend a usb device
+ * usb_port_suspend - suspend a usb device's upstream port
* @udev: device that's no longer in active use
* Context: must be able to sleep; device not locked; pm locks held
*
* Suspends a USB device that isn't in active use, conserving power.
* Devices may wake out of a suspend, if anything important happens,
* using the remote wakeup mechanism. They may also be taken out of
- * suspend by the host, using usb_resume_device(). It's also routine
+ * suspend by the host, using usb_port_resume(). It's also routine
* to disconnect devices while they are suspended.
*
* This only affects the USB hardware for a device; its interfaces
*
* Returns 0 on success, else negative errno.
*/
-int usb_suspend_device(struct usb_device *udev)
+int usb_port_suspend(struct usb_device *udev)
{
#ifdef CONFIG_USB_SUSPEND
if (udev->state == USB_STATE_NOTATTACHED)
return -ENODEV;
- return __usb_suspend_device(udev, udev->portnum);
+ return __usb_port_suspend(udev, udev->portnum);
#else
/* NOTE: udev->state unchanged, it's not lying ... */
udev->dev.power.power_state = PMSG_SUSPEND;
* resume (by host) or remote wakeup (by device) ... now see what changed
* in the tree that's rooted at this device.
*/
-static int finish_device_resume(struct usb_device *udev)
+static int finish_port_resume(struct usb_device *udev)
{
int status;
u16 devstatus;
* and device drivers will know about any resume quirks.
*/
status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
- if (status < 2)
+ if (status >= 0)
+ status = (status == 2 ? 0 : -ENODEV);
+
+ if (status)
dev_dbg(&udev->dev,
"gone after usb resume? status %d\n",
status);
dev_dbg(hub->intfdev,
"port %d status %04x.%04x after resume, %d\n",
port1, portchange, devstatus, status);
+ if (status >= 0)
+ status = -ENODEV;
} else {
+ if (portchange & USB_PORT_STAT_C_SUSPEND)
+ clear_port_feature(hub->hdev, port1,
+ USB_PORT_FEAT_C_SUSPEND);
/* TRSMRCY = 10 msec */
msleep(10);
if (udev)
- status = finish_device_resume(udev);
+ status = finish_port_resume(udev);
}
}
if (status < 0)
#endif
/*
- * usb_resume_device - re-activate a suspended usb device
+ * usb_port_resume - re-activate a suspended usb device's upstream port
* @udev: device to re-activate
* Context: must be able to sleep; device not locked; pm locks held
*
*
* Returns 0 on success, else negative errno.
*/
-int usb_resume_device(struct usb_device *udev)
+int usb_port_resume(struct usb_device *udev)
{
int status;
if (udev->state == USB_STATE_NOTATTACHED)
return -ENODEV;
- /* selective resume of one downstream hub-to-device port */
+ /* we change the device's upstream USB link,
+ * but root hubs have no upstream USB link.
+ */
if (udev->parent) {
#ifdef CONFIG_USB_SUSPEND
if (udev->state == USB_STATE_SUSPENDED) {
#endif
status = 0;
} else
- status = finish_device_resume(udev);
+ status = finish_port_resume(udev);
if (status < 0)
dev_dbg(&udev->dev, "can't resume, status %d\n",
status);
dev_dbg(&udev->dev, "RESUME (wakeup)\n");
/* TRSMRCY = 10 msec */
msleep(10);
- status = finish_device_resume(udev);
+ status = finish_port_resume(udev);
}
usb_unlock_device(udev);
#endif
if (portstat & USB_PORT_STAT_SUSPEND)
status = hub_port_resume(hub, port1, udev);
else {
- status = finish_device_resume(udev);
+ status = finish_port_resume(udev);
if (status < 0) {
dev_dbg(&intf->dev, "resume port %d --> %d\n",
port1, status);
/* If the hub has died, clean up after it */
if (hdev->state == USB_STATE_NOTATTACHED) {
- hub_pre_reset(hub, 0);
+ hub->error = -ENODEV;
+ hub_pre_reset(intf);
goto loop;
}
dev_dbg (hub_dev, "resetting for error %d\n",
hub->error);
- ret = usb_reset_device(hdev);
+ ret = usb_reset_composite_device(hdev, intf);
if (ret) {
dev_dbg (hub_dev,
"error resetting hub: %d\n", ret);
.disconnect = hub_disconnect,
.suspend = hub_suspend,
.resume = hub_resume,
+ .pre_reset = hub_pre_reset,
+ .post_reset = hub_post_reset,
.ioctl = hub_ioctl,
.id_table = hub_id_table,
};
* usb_reset_device - perform a USB port reset to reinitialize a device
* @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
*
- * WARNING - don't reset any device unless drivers for all of its
- * interfaces are expecting that reset! Maybe some driver->reset()
- * method should eventually help ensure sufficient cooperation.
+ * WARNING - don't use this routine to reset a composite device
+ * (one with multiple interfaces owned by separate drivers)!
+ * Use usb_reset_composite_device() instead.
*
* Do a port reset, reassign the device's address, and establish its
* former operating configuration. If the reset fails, or the device's
struct usb_device *parent_hdev = udev->parent;
struct usb_hub *parent_hub;
struct usb_device_descriptor descriptor = udev->descriptor;
- struct usb_hub *hub = NULL;
int i, ret = 0;
int port1 = udev->portnum;
}
parent_hub = hdev_to_hub(parent_hdev);
- /* If we're resetting an active hub, take some special actions */
- if (udev->actconfig && udev->actconfig->desc.bNumInterfaces > 0 &&
- udev->actconfig->interface[0]->dev.driver ==
- &hub_driver.driver &&
- (hub = hdev_to_hub(udev)) != NULL) {
- hub_pre_reset(hub, 0);
- }
-
set_bit(port1, parent_hub->busy_bits);
for (i = 0; i < SET_CONFIG_TRIES; ++i) {
}
done:
- if (hub)
- hub_post_reset(hub);
return 0;
re_enumerate:
hub_port_logical_disconnect(parent_hub, port1);
return -ENODEV;
}
+EXPORT_SYMBOL(usb_reset_device);
+
+/**
+ * usb_reset_composite_device - warn interface drivers and perform a USB port reset
+ * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
+ * @iface: interface bound to the driver making the request (optional)
+ *
+ * Warns all drivers bound to registered interfaces (using their pre_reset
+ * method), performs the port reset, and then lets the drivers know that
+ * the reset is over (using their post_reset method).
+ *
+ * Return value is the same as for usb_reset_device().
+ *
+ * The caller must own the device lock. For example, it's safe to use
+ * this from a driver probe() routine after downloading new firmware.
+ * For calls that might not occur during probe(), drivers should lock
+ * the device using usb_lock_device_for_reset().
+ *
+ * The interface locks are acquired during the pre_reset stage and released
+ * during the post_reset stage. However if iface is not NULL and is
+ * currently being probed, we assume that the caller already owns its
+ * lock.
+ */
+int usb_reset_composite_device(struct usb_device *udev,
+ struct usb_interface *iface)
+{
+ int ret;
+ struct usb_host_config *config = udev->actconfig;
+
+ if (udev->state == USB_STATE_NOTATTACHED ||
+ udev->state == USB_STATE_SUSPENDED) {
+ dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
+ udev->state);
+ return -EINVAL;
+ }
+
+ if (iface && iface->condition != USB_INTERFACE_BINDING)
+ iface = NULL;
+
+ if (config) {
+ int i;
+ struct usb_interface *cintf;
+ struct usb_driver *drv;
+
+ for (i = 0; i < config->desc.bNumInterfaces; ++i) {
+ cintf = config->interface[i];
+ if (cintf != iface)
+ down(&cintf->dev.sem);
+ if (device_is_registered(&cintf->dev) &&
+ cintf->dev.driver) {
+ drv = to_usb_driver(cintf->dev.driver);
+ if (drv->pre_reset)
+ (drv->pre_reset)(cintf);
+ }
+ }
+ }
+
+ ret = usb_reset_device(udev);
+
+ if (config) {
+ int i;
+ struct usb_interface *cintf;
+ struct usb_driver *drv;
+
+ for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) {
+ cintf = config->interface[i];
+ if (device_is_registered(&cintf->dev) &&
+ cintf->dev.driver) {
+ drv = to_usb_driver(cintf->dev.driver);
+ if (drv->post_reset)
+ (drv->post_reset)(cintf);
+ }
+ if (cintf != iface)
+ up(&cintf->dev.sem);
+ }
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL(usb_reset_composite_device);
projects / deliverable / linux.git / blobdiff