* and battery-powered root hubs (may provide just 8 mA).
*/
ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus);
- if (ret < 0) {
+ if (ret < 2) {
message = "can't get hub status";
goto fail;
}
le16_to_cpus(&hubstatus);
if (hdev == hdev->bus->root_hub) {
- struct usb_hcd *hcd =
- container_of(hdev->bus, struct usb_hcd, self);
-
- hub->power_budget = min(500u, hcd->power_budget) / 2;
+ if (hdev->bus_mA == 0 || hdev->bus_mA >= 500)
+ hub->mA_per_port = 500;
+ else {
+ hub->mA_per_port = hdev->bus_mA;
+ hub->limited_power = 1;
+ }
} else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
hub->descriptor->bHubContrCurrent);
- hub->power_budget = (501 - hub->descriptor->bHubContrCurrent)
- / 2;
+ hub->limited_power = 1;
+ if (hdev->maxchild > 0) {
+ int remaining = hdev->bus_mA -
+ hub->descriptor->bHubContrCurrent;
+
+ if (remaining < hdev->maxchild * 100)
+ dev_warn(hub_dev,
+ "insufficient power available "
+ "to use all downstream ports\n");
+ hub->mA_per_port = 100; /* 7.2.1.1 */
+ }
+ } else { /* Self-powered external hub */
+ /* FIXME: What about battery-powered external hubs that
+ * provide less current per port? */
+ hub->mA_per_port = 500;
}
- if (hub->power_budget)
- dev_dbg(hub_dev, "%dmA bus power budget for children\n",
- hub->power_budget * 2);
-
+ if (hub->mA_per_port < 500)
+ dev_dbg(hub_dev, "%umA bus power budget for each child\n",
+ hub->mA_per_port);
ret = hub_hub_status(hub, &hubstatus, &hubchange);
if (ret < 0) {
device_unregister(&udev->dev);
}
+static inline const char *plural(int n)
+{
+ return (n == 1 ? "" : "s");
+}
+
static int choose_configuration(struct usb_device *udev)
{
- int c, i;
+ int i;
+ u16 devstatus;
+ int bus_powered;
+ int num_configs;
+ struct usb_host_config *c, *best;
+
+ /* If this fails, assume the device is bus-powered */
+ devstatus = 0;
+ usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
+ le16_to_cpus(&devstatus);
+ bus_powered = ((devstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0);
+ dev_dbg(&udev->dev, "device is %s-powered\n",
+ bus_powered ? "bus" : "self");
+
+ best = NULL;
+ c = udev->config;
+ num_configs = udev->descriptor.bNumConfigurations;
+ for (i = 0; i < num_configs; (i++, c++)) {
+ struct usb_interface_descriptor *desc =
+ &c->intf_cache[0]->altsetting->desc;
+
+ /*
+ * HP's USB bus-powered keyboard has only one configuration
+ * and it claims to be self-powered; other devices may have
+ * similar errors in their descriptors. If the next test
+ * were allowed to execute, such configurations would always
+ * be rejected and the devices would not work as expected.
+ */
+#if 0
+ /* Rule out self-powered configs for a bus-powered device */
+ if (bus_powered && (c->desc.bmAttributes &
+ USB_CONFIG_ATT_SELFPOWER))
+ continue;
+#endif
- /* NOTE: this should interact with hub power budgeting */
+ /*
+ * The next test may not be as effective as it should be.
+ * Some hubs have errors in their descriptor, claiming
+ * to be self-powered when they are really bus-powered.
+ * We will overestimate the amount of current such hubs
+ * make available for each port.
+ *
+ * This is a fairly benign sort of failure. It won't
+ * cause us to reject configurations that we should have
+ * accepted.
+ */
- c = udev->config[0].desc.bConfigurationValue;
- if (udev->descriptor.bNumConfigurations != 1) {
- for (i = 0; i < udev->descriptor.bNumConfigurations; i++) {
- struct usb_interface_descriptor *desc;
+ /* Rule out configs that draw too much bus current */
+ if (c->desc.bMaxPower * 2 > udev->bus_mA)
+ continue;
- /* heuristic: Linux is more likely to have class
- * drivers, so avoid vendor-specific interfaces.
- */
- desc = &udev->config[i].intf_cache[0]
- ->altsetting->desc;
- if (desc->bInterfaceClass == USB_CLASS_VENDOR_SPEC)
- continue;
- /* COMM/2/all is CDC ACM, except 0xff is MSFT RNDIS.
- * MSFT needs this to be the first config; never use
- * it as the default unless Linux has host-side RNDIS.
- * A second config would ideally be CDC-Ethernet, but
- * may instead be the "vendor specific" CDC subset
- * long used by ARM Linux for sa1100 or pxa255.
- */
- if (desc->bInterfaceClass == USB_CLASS_COMM
- && desc->bInterfaceSubClass == 2
- && desc->bInterfaceProtocol == 0xff) {
- c = udev->config[1].desc.bConfigurationValue;
- continue;
- }
- c = udev->config[i].desc.bConfigurationValue;
+ /* If the first config's first interface is COMM/2/0xff
+ * (MSFT RNDIS), rule it out unless Linux has host-side
+ * RNDIS support. */
+ if (i == 0 && desc->bInterfaceClass == USB_CLASS_COMM
+ && desc->bInterfaceSubClass == 2
+ && desc->bInterfaceProtocol == 0xff) {
+#ifndef CONFIG_USB_NET_RNDIS
+ continue;
+#else
+ best = c;
+#endif
+ }
+
+ /* From the remaining configs, choose the first one whose
+ * first interface is for a non-vendor-specific class.
+ * Reason: Linux is more likely to have a class driver
+ * than a vendor-specific driver. */
+ else if (udev->descriptor.bDeviceClass !=
+ USB_CLASS_VENDOR_SPEC &&
+ desc->bInterfaceClass !=
+ USB_CLASS_VENDOR_SPEC) {
+ best = c;
break;
}
+
+ /* If all the remaining configs are vendor-specific,
+ * choose the first one. */
+ else if (!best)
+ best = c;
+ }
+
+ if (best) {
+ i = best->desc.bConfigurationValue;
dev_info(&udev->dev,
- "configuration #%d chosen from %d choices\n",
- c, udev->descriptor.bNumConfigurations);
+ "configuration #%d chosen from %d choice%s\n",
+ i, num_configs, plural(num_configs));
+ } else {
+ i = -1;
+ dev_warn(&udev->dev,
+ "no configuration chosen from %d choice%s\n",
+ num_configs, plural(num_configs));
}
- return c;
+ return i;
}
#ifdef DEBUG
* with the driver core, and lets usb device drivers bind to them.
*/
c = choose_configuration(udev);
- if (c < 0)
- dev_warn(&udev->dev,
- "can't choose an initial configuration\n");
- else {
+ if (c >= 0) {
err = usb_set_configuration(udev, c);
if (err) {
dev_err(&udev->dev, "can't set config #%d, error %d\n",
c, err);
- usb_remove_sysfs_dev_files(udev);
- device_del(&udev->dev);
- goto fail;
+ /* This need not be fatal. The user can try to
+ * set other configurations. */
}
}
* and device drivers will know about any resume quirks.
*/
status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
- if (status < 0)
+ if (status < 2)
dev_dbg(&udev->dev,
"gone after usb resume? status %d\n",
status);
int (*resume)(struct device *);
le16_to_cpus(&devstatus);
- if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)
+ if ((devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP))
&& udev->parent) {
status = usb_control_msg(udev,
usb_sndctrlpipe(udev, 0),
{
struct usb_device *hdev = hub->hdev;
int remaining;
- unsigned i;
+ int port1;
- remaining = hub->power_budget;
- if (!remaining) /* self-powered */
+ if (!hub->limited_power)
return 0;
- for (i = 0; i < hdev->maxchild; i++) {
- struct usb_device *udev = hdev->children[i];
- int delta, ceiling;
+ remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent;
+ for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
+ struct usb_device *udev = hdev->children[port1 - 1];
+ int delta;
if (!udev)
continue;
- /* 100mA per-port ceiling, or 8mA for OTG ports */
- if (i != (udev->bus->otg_port - 1) || hdev->parent)
- ceiling = 50;
- else
- ceiling = 4;
-
+ /* Unconfigured devices may not use more than 100mA,
+ * or 8mA for OTG ports */
if (udev->actconfig)
- delta = udev->actconfig->desc.bMaxPower;
+ delta = udev->actconfig->desc.bMaxPower * 2;
+ else if (port1 != udev->bus->otg_port || hdev->parent)
+ delta = 100;
else
- delta = ceiling;
- // dev_dbg(&udev->dev, "budgeted %dmA\n", 2 * delta);
- if (delta > ceiling)
- dev_warn(&udev->dev, "%dmA over %dmA budget!\n",
- 2 * (delta - ceiling), 2 * ceiling);
+ delta = 8;
+ if (delta > hub->mA_per_port)
+ dev_warn(&udev->dev, "%dmA is over %umA budget "
+ "for port %d!\n",
+ delta, hub->mA_per_port, port1);
remaining -= delta;
}
if (remaining < 0) {
- dev_warn(hub->intfdev,
- "%dmA over power budget!\n",
- -2 * remaining);
+ dev_warn(hub->intfdev, "%dmA over power budget!\n",
+ - remaining);
remaining = 0;
}
return remaining;
usb_set_device_state(udev, USB_STATE_POWERED);
udev->speed = USB_SPEED_UNKNOWN;
-
+ udev->bus_mA = hub->mA_per_port;
+
/* set the address */
choose_address(udev);
if (udev->devnum <= 0) {
* on the parent.
*/
if (udev->descriptor.bDeviceClass == USB_CLASS_HUB
- && hub->power_budget) {
+ && udev->bus_mA <= 100) {
u16 devstat;
status = usb_get_status(udev, USB_RECIP_DEVICE, 0,
&devstat);
- if (status < 0) {
+ if (status < 2) {
dev_dbg(&udev->dev, "get status %d ?\n", status);
goto loop_disable;
}
- cpu_to_le16s(&devstat);
+ le16_to_cpus(&devstat);
if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
dev_err(&udev->dev,
"can't connect bus-powered hub "
status = hub_power_remaining(hub);
if (status)
- dev_dbg(hub_dev,
- "%dmA power budget left\n",
- 2 * status);
+ dev_dbg(hub_dev, "%dmA power budget left\n", status);
return;
if (hubchange & HUB_CHANGE_LOCAL_POWER) {
dev_dbg (hub_dev, "power change\n");
clear_hub_feature(hdev, C_HUB_LOCAL_POWER);
+ if (hubstatus & HUB_STATUS_LOCAL_POWER)
+ /* FIXME: Is this always true? */
+ hub->limited_power = 0;
+ else
+ hub->limited_power = 1;
}
if (hubchange & HUB_CHANGE_OVERCURRENT) {
dev_dbg (hub_dev, "overcurrent change\n");
projects / GitHub / moto-9609 / android_kernel_motorola_exynos9610.git / commitdiff