*/
#include <linux/config.h>
-#ifdef CONFIG_USB_DEBUG
- #define DEBUG
-#else
- #undef DEBUG
-#endif
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/ioctl.h>
#include <linux/usb.h>
#include <linux/usbdevice_fs.h>
+#include <linux/kthread.h>
+#include <linux/mutex.h>
#include <asm/semaphore.h>
#include <asm/uaccess.h>
#include "hub.h"
/* Protect struct usb_device->state and ->children members
- * Note: Both are also protected by ->serialize, except that ->state can
+ * Note: Both are also protected by ->dev.sem, except that ->state can
* change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
static DEFINE_SPINLOCK(device_state_lock);
/* Wakes up khubd */
static DECLARE_WAIT_QUEUE_HEAD(khubd_wait);
-static pid_t khubd_pid = 0; /* PID of khubd */
-static DECLARE_COMPLETION(khubd_exited);
+static struct task_struct *khubd_task;
/* cycle leds on hubs that aren't blinking for attention */
static int blinkenlights = 0;
MODULE_PARM_DESC(old_scheme_first,
"start with the old device initialization scheme");
-static int use_both_schemes = 0;
+static int use_both_schemes = 1;
module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(use_both_schemes,
"try the other device initialization scheme if the "
ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
USB_DT_HUB << 8, 0, data, size,
- HZ * USB_CTRL_GET_TIMEOUT);
+ USB_CTRL_GET_TIMEOUT);
if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2))
return ret;
}
static int clear_hub_feature(struct usb_device *hdev, int feature)
{
return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
- USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, HZ);
+ USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000);
}
/*
{
return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1,
- NULL, 0, HZ);
+ NULL, 0, 1000);
}
/*
{
return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1,
- NULL, 0, HZ);
+ NULL, 0, 1000);
}
/*
}
/* use a short timeout for hub/port status fetches */
-#define USB_STS_TIMEOUT 1
+#define USB_STS_TIMEOUT 1000
#define USB_STS_RETRIES 5
/*
for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
- data, sizeof(*data), HZ * USB_STS_TIMEOUT);
+ data, sizeof(*data), USB_STS_TIMEOUT);
}
return status;
}
for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1,
- data, sizeof(*data), HZ * USB_STS_TIMEOUT);
+ data, sizeof(*data), USB_STS_TIMEOUT);
}
return status;
}
spin_unlock_irqrestore(&hub_event_lock, flags);
}
+void usb_kick_khubd(struct usb_device *hdev)
+{
+ kick_khubd(hdev_to_hub(hdev));
+}
+
/* completion function, fires on port status changes and various faults */
static void hub_irq(struct urb *urb, struct pt_regs *regs)
{
return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo,
- tt, NULL, 0, HZ);
+ tt, NULL, 0, 1000);
}
/*
dev_err (&hdev->dev,
"clear tt %d (%04x) error %d\n",
clear->tt, clear->devinfo, status);
- kfree (clear);
+ kfree(clear);
}
spin_unlock_irqrestore (&hub->tt.lock, flags);
}
/**
* usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub
- * @dev: the device whose split transaction failed
+ * @udev: the device whose split transaction failed
* @pipe: identifies the endpoint of the failed transaction
*
* High speed HCDs use this to tell the hub driver that some split control or
static void hub_power_on(struct usb_hub *hub)
{
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 ((hub->descriptor->wHubCharacteristics & HUB_CHAR_LPSM) < 2) {
+ 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);
}
- /* Wait for power to be enabled */
- msleep(hub->descriptor->bPwrOn2PwrGood * 2);
+ /* Wait at least 100 msec for power to become stable */
+ msleep(max(pgood_delay, (unsigned) 100));
}
-static void hub_quiesce(struct usb_hub *hub)
+static inline void __hub_quiesce(struct usb_hub *hub)
{
- /* stop khubd and related activity */
+ /* (nonblocking) khubd and related activity won't re-trigger */
hub->quiescing = 1;
+ hub->activating = 0;
+ hub->resume_root_hub = 0;
+}
+
+static void hub_quiesce(struct usb_hub *hub)
+{
+ /* (blocking) stop khubd and related activity */
+ __hub_quiesce(hub);
usb_kill_urb(hub->urb);
if (hub->has_indicators)
cancel_delayed_work(&hub->leds);
int status;
hub->quiescing = 0;
+ hub->activating = 1;
+ hub->resume_root_hub = 0;
status = usb_submit_urb(hub->urb, GFP_NOIO);
if (status < 0)
dev_err(hub->intfdev, "activate --> %d\n", status);
schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
/* scan all ports ASAP */
- hub->event_bits[0] = (1UL << (hub->descriptor->bNbrPorts + 1)) - 1;
kick_khubd(hub);
}
return ret;
}
+static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
+{
+ struct usb_device *hdev = hub->hdev;
+ int ret;
+
+ if (hdev->children[port1-1] && set_state) {
+ usb_set_device_state(hdev->children[port1-1],
+ USB_STATE_NOTATTACHED);
+ }
+ ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
+ if (ret)
+ dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n",
+ port1, ret);
+
+ return ret;
+}
+
+
+/* caller has locked the hub device */
+static void hub_pre_reset(struct usb_hub *hub, int disable_ports)
+{
+ 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)
+ hub_port_disable(hub, port1, 0);
+ }
+ }
+ hub_quiesce(hub);
+}
+
+/* caller has locked the hub device */
+static void hub_post_reset(struct usb_hub *hub)
+{
+ hub_activate(hub);
+ hub_power_on(hub);
+}
+
+
static int hub_configure(struct usb_hub *hub,
struct usb_endpoint_descriptor *endpoint)
{
struct usb_device *hdev = hub->hdev;
struct device *hub_dev = hub->intfdev;
u16 hubstatus, hubchange;
+ u16 wHubCharacteristics;
unsigned int pipe;
int maxp, ret;
char *message;
dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild,
(hdev->maxchild == 1) ? "" : "s");
- le16_to_cpus(&hub->descriptor->wHubCharacteristics);
+ wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
- if (hub->descriptor->wHubCharacteristics & HUB_CHAR_COMPOUND) {
+ if (wHubCharacteristics & HUB_CHAR_COMPOUND) {
int i;
char portstr [USB_MAXCHILDREN + 1];
} else
dev_dbg(hub_dev, "standalone hub\n");
- switch (hub->descriptor->wHubCharacteristics & HUB_CHAR_LPSM) {
+ switch (wHubCharacteristics & HUB_CHAR_LPSM) {
case 0x00:
dev_dbg(hub_dev, "ganged power switching\n");
break;
break;
}
- switch (hub->descriptor->wHubCharacteristics & HUB_CHAR_OCPM) {
+ switch (wHubCharacteristics & HUB_CHAR_OCPM) {
case 0x00:
dev_dbg(hub_dev, "global over-current protection\n");
break;
break;
}
- switch (hub->descriptor->wHubCharacteristics & HUB_CHAR_TTTT) {
- case 0x00:
- if (hdev->descriptor.bDeviceProtocol != 0)
- dev_dbg(hub_dev, "TT requires at most 8 FS bit times\n");
+ /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
+ switch (wHubCharacteristics & HUB_CHAR_TTTT) {
+ case HUB_TTTT_8_BITS:
+ if (hdev->descriptor.bDeviceProtocol != 0) {
+ hub->tt.think_time = 666;
+ dev_dbg(hub_dev, "TT requires at most %d "
+ "FS bit times (%d ns)\n",
+ 8, hub->tt.think_time);
+ }
break;
- case 0x20:
- dev_dbg(hub_dev, "TT requires at most 16 FS bit times\n");
+ case HUB_TTTT_16_BITS:
+ hub->tt.think_time = 666 * 2;
+ dev_dbg(hub_dev, "TT requires at most %d "
+ "FS bit times (%d ns)\n",
+ 16, hub->tt.think_time);
break;
- case 0x40:
- dev_dbg(hub_dev, "TT requires at most 24 FS bit times\n");
+ case HUB_TTTT_24_BITS:
+ hub->tt.think_time = 666 * 3;
+ dev_dbg(hub_dev, "TT requires at most %d "
+ "FS bit times (%d ns)\n",
+ 24, hub->tt.think_time);
break;
- case 0x60:
- dev_dbg(hub_dev, "TT requires at most 32 FS bit times\n");
+ case HUB_TTTT_32_BITS:
+ hub->tt.think_time = 666 * 4;
+ dev_dbg(hub_dev, "TT requires at most %d "
+ "FS bit times (%d ns)\n",
+ 32, hub->tt.think_time);
break;
}
/* probe() zeroes hub->indicator[] */
- if (hub->descriptor->wHubCharacteristics & HUB_CHAR_PORTIND) {
+ if (wHubCharacteristics & HUB_CHAR_PORTIND) {
hub->has_indicators = 1;
dev_dbg(hub_dev, "Port indicators are supported\n");
}
* 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;
}
- cpu_to_le16s(&hubstatus);
- if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
+ le16_to_cpus(&hubstatus);
+ if (hdev == hdev->bus->root_hub) {
+ 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;
- dev_dbg(hub_dev, "%dmA bus power budget for children\n",
- hub->power_budget * 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->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) {
(hubstatus & HUB_STATUS_LOCAL_POWER)
? "lost (inactive)" : "good");
- if ((hub->descriptor->wHubCharacteristics & HUB_CHAR_OCPM) == 0)
+ if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0)
dev_dbg(hub_dev, "%sover-current condition exists\n",
(hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");
hub->indicator [0] = INDICATOR_CYCLE;
hub_power_on(hub);
- hub->change_bits[0] = (1UL << (hub->descriptor->bNbrPorts + 1)) - 2;
hub_activate(hub);
return 0;
struct usb_hub *hub = usb_get_intfdata (intf);
struct usb_device *hdev;
- if (!hub)
- return;
+ usb_set_intfdata (intf, NULL);
hdev = hub->hdev;
if (hdev->speed == USB_SPEED_HIGH)
highspeed_hubs--;
- usb_set_intfdata (intf, NULL);
+ /* Disconnect all children and quiesce the hub */
+ hub_pre_reset(hub, 1);
- hub_quiesce(hub);
usb_free_urb(hub->urb);
hub->urb = NULL;
list_del_init(&hub->event_list);
spin_unlock_irq(&hub_event_lock);
- if (hub->descriptor) {
- kfree(hub->descriptor);
- hub->descriptor = NULL;
- }
+ kfree(hub->descriptor);
+ hub->descriptor = NULL;
- if (hub->status) {
- kfree(hub->status);
- hub->status = NULL;
- }
+ kfree(hub->status);
+ hub->status = NULL;
if (hub->buffer) {
usb_buffer_free(hdev, sizeof(*hub->buffer), hub->buffer,
hub->buffer = NULL;
}
- /* Free the memory */
kfree(hub);
}
desc = intf->cur_altsetting;
hdev = interface_to_usbdev(intf);
+#ifdef CONFIG_USB_OTG_BLACKLIST_HUB
+ if (hdev->parent) {
+ dev_warn(&intf->dev, "ignoring external hub\n");
+ return -ENODEV;
+ }
+#endif
+
/* Some hubs have a subclass of 1, which AFAICT according to the */
/* specs is not defined, but it works */
if ((desc->desc.bInterfaceSubClass != 0) &&
/* We found a hub */
dev_info (&intf->dev, "USB hub found\n");
- hub = kmalloc(sizeof(*hub), GFP_KERNEL);
+ hub = kzalloc(sizeof(*hub), GFP_KERNEL);
if (!hub) {
dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n");
return -ENOMEM;
}
- memset(hub, 0, sizeof(*hub));
-
INIT_LIST_HEAD(&hub->event_list);
hub->intfdev = &intf->dev;
hub->hdev = hdev;
}
}
-/* caller has locked the hub device */
-static void hub_pre_reset(struct usb_hub *hub)
-{
- struct usb_device *hdev = hub->hdev;
- int i;
-
- for (i = 0; i < hdev->maxchild; ++i) {
- if (hdev->children[i])
- usb_disconnect(&hdev->children[i]);
- }
- hub_quiesce(hub);
-}
-
-/* caller has locked the hub device */
-static void hub_post_reset(struct usb_hub *hub)
-{
- hub_activate(hub);
- hub_power_on(hub);
-}
-
/* grab device/port lock, returning index of that port (zero based).
* protects the upstream link used by this device from concurrent
t = locktree(hdev);
if (t < 0)
return t;
- for (t = 0; t < hdev->maxchild; t++) {
- if (hdev->children[t] == udev) {
- /* everything is fail-fast once disconnect
- * processing starts
- */
- if (udev->state == USB_STATE_NOTATTACHED)
- break;
- /* when everyone grabs locks top->bottom,
- * non-overlapping work may be concurrent
- */
- down(&udev->serialize);
- up(&hdev->serialize);
- return t + 1;
- }
+ /* everything is fail-fast once disconnect
+ * processing starts
+ */
+ if (udev->state == USB_STATE_NOTATTACHED) {
+ usb_unlock_device(hdev);
+ return -ENODEV;
}
+
+ /* when everyone grabs locks top->bottom,
+ * non-overlapping work may be concurrent
+ */
+ usb_lock_device(udev);
usb_unlock_device(hdev);
- return -ENODEV;
+ return udev->portnum;
}
static void recursively_mark_NOTATTACHED(struct usb_device *udev)
spin_lock_irqsave(&device_state_lock, flags);
if (udev->state == USB_STATE_NOTATTACHED)
; /* do nothing */
- else if (new_state != USB_STATE_NOTATTACHED)
+ else if (new_state != USB_STATE_NOTATTACHED) {
udev->state = new_state;
- else
+
+ /* root hub wakeup capabilities are managed out-of-band
+ * and may involve silicon errata ... ignore them here.
+ */
+ if (udev->parent) {
+ if (new_state == USB_STATE_CONFIGURED)
+ device_init_wakeup(&udev->dev,
+ (udev->actconfig->desc.bmAttributes
+ & USB_CONFIG_ATT_WAKEUP));
+ else if (new_state != USB_STATE_SUSPENDED)
+ device_init_wakeup(&udev->dev, 0);
+ }
+ } else
recursively_mark_NOTATTACHED(udev);
spin_unlock_irqrestore(&device_state_lock, flags);
}
-EXPORT_SYMBOL(usb_set_device_state);
+#ifdef CONFIG_PM
+
+/**
+ * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
+ * @rhdev: struct usb_device for the root hub
+ *
+ * The USB host controller driver calls this function when its root hub
+ * is resumed and Vbus power has been interrupted or the controller
+ * has been reset. The routine marks all the children of the root hub
+ * as NOTATTACHED and marks logical connect-change events on their ports.
+ */
+void usb_root_hub_lost_power(struct usb_device *rhdev)
+{
+ struct usb_hub *hub;
+ int port1;
+ unsigned long flags;
+
+ dev_warn(&rhdev->dev, "root hub lost power or was reset\n");
+ spin_lock_irqsave(&device_state_lock, flags);
+ hub = hdev_to_hub(rhdev);
+ for (port1 = 1; port1 <= rhdev->maxchild; ++port1) {
+ if (rhdev->children[port1 - 1]) {
+ recursively_mark_NOTATTACHED(
+ rhdev->children[port1 - 1]);
+ set_bit(port1, hub->change_bits);
+ }
+ }
+ spin_unlock_irqrestore(&device_state_lock, flags);
+}
+EXPORT_SYMBOL_GPL(usb_root_hub_lost_power);
+
+#endif
+
static void choose_address(struct usb_device *udev)
{
int devnum;
* this quiesces everyting except pending urbs.
*/
usb_set_device_state(udev, USB_STATE_NOTATTACHED);
-
- /* lock the bus list on behalf of HCDs unregistering their root hubs */
- if (!udev->parent) {
- down(&usb_bus_list_lock);
- usb_lock_device(udev);
- } else
- down(&udev->serialize);
-
dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum);
+ usb_lock_device(udev);
+
/* Free up all the children before we remove this device */
for (i = 0; i < USB_MAXCHILDREN; i++) {
if (udev->children[i])
*/
usb_disable_device(udev, 0);
+ usb_notify_remove_device(udev);
+
/* Free the device number, remove the /proc/bus/usb entry and
* the sysfs attributes, and delete the parent's children[]
* (or root_hub) pointer.
*/
dev_dbg (&udev->dev, "unregistering device\n");
release_address(udev);
- usbfs_remove_device(udev);
usb_remove_sysfs_dev_files(udev);
/* Avoid races with recursively_mark_NOTATTACHED() */
*pdev = NULL;
spin_unlock_irq(&device_state_lock);
- if (!udev->parent) {
- usb_unlock_device(udev);
- up(&usb_bus_list_lock);
- } else
- up(&udev->serialize);
+ usb_unlock_device(udev);
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;
+ int num_configs;
+ struct usb_host_config *c, *best;
+
+ best = NULL;
+ c = udev->config;
+ num_configs = udev->descriptor.bNumConfigurations;
+ for (i = 0; i < num_configs; (i++, c++)) {
+ struct usb_interface_descriptor *desc = NULL;
+
+ /* It's possible that a config has no interfaces! */
+ if (c->desc.bNumInterfaces > 0)
+ 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.
+ * In the meantime, we run the risk of selecting a config
+ * that requires external power at a time when that power
+ * isn't available. It seems to be the lesser of two evils.
+ *
+ * Bugzilla #6448 reports a device that appears to crash
+ * when it receives a GET_DEVICE_STATUS request! We don't
+ * have any other way to tell whether a device is self-powered,
+ * but since we don't use that information anywhere but here,
+ * the call has been removed.
+ *
+ * Maybe the GET_DEVICE_STATUS call and the test below can
+ * be reinstated when device firmwares become more reliable.
+ * Don't hold your breath.
+ */
+#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
+ && 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 || 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
-static void show_string(struct usb_device *udev, char *id, int index)
+static void show_string(struct usb_device *udev, char *id, char *string)
{
- char *buf;
-
- if (!index)
- return;
- if (!(buf = kmalloc(256, GFP_KERNEL)))
+ if (!string)
return;
- if (usb_string(udev, index, buf, 256) > 0)
- dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, buf);
- kfree(buf);
+ dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string);
}
#else
-static inline void show_string(struct usb_device *udev, char *id, int index)
+static inline void show_string(struct usb_device *udev, char *id, char *string)
{}
#endif
+
#ifdef CONFIG_USB_OTG
#include "otg_whitelist.h"
#endif
*
* This is called with devices which have been enumerated, but not yet
* configured. The device descriptor is available, but not descriptors
- * for any device configuration. The caller must have locked udev and
- * either the parent hub (if udev is a normal device) or else the
+ * for any device configuration. The caller must have locked either
+ * the parent hub (if udev is a normal device) or else the
* usb_bus_list_lock (if udev is a root hub). The parent's pointer to
* udev has already been installed, but udev is not yet visible through
* sysfs or other filesystem code.
*
* This call is synchronous, and may not be used in an interrupt context.
*
- * Only the hub driver should ever call this; root hub registration
- * uses it indirectly.
+ * Only the hub driver or root-hub registrar should ever call this.
*/
int usb_new_device(struct usb_device *udev)
{
goto fail;
}
+ /* read the standard strings and cache them if present */
+ udev->product = usb_cache_string(udev, udev->descriptor.iProduct);
+ udev->manufacturer = usb_cache_string(udev,
+ udev->descriptor.iManufacturer);
+ udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber);
+
/* Tell the world! */
dev_dbg(&udev->dev, "new device strings: Mfr=%d, Product=%d, "
"SerialNumber=%d\n",
udev->descriptor.iManufacturer,
udev->descriptor.iProduct,
udev->descriptor.iSerialNumber);
-
- if (udev->descriptor.iProduct)
- show_string(udev, "Product",
- udev->descriptor.iProduct);
- if (udev->descriptor.iManufacturer)
- show_string(udev, "Manufacturer",
- udev->descriptor.iManufacturer);
- if (udev->descriptor.iSerialNumber)
- show_string(udev, "SerialNumber",
- udev->descriptor.iSerialNumber);
+ show_string(udev, "Product", udev->product);
+ show_string(udev, "Manufacturer", udev->manufacturer);
+ show_string(udev, "SerialNumber", udev->serial);
#ifdef CONFIG_USB_OTG
/*
le16_to_cpu(udev->config[0].desc.wTotalLength),
USB_DT_OTG, (void **) &desc) == 0) {
if (desc->bmAttributes & USB_OTG_HNP) {
- unsigned port1;
+ unsigned port1 = udev->portnum;
struct usb_device *root = udev->parent;
- for (port1 = 1; port1 <= root->maxchild;
- port1++) {
- if (root->children[port1-1] == udev)
- break;
- }
-
dev_info(&udev->dev,
"Dual-Role OTG device on %sHNP port\n",
(port1 == bus->otg_port)
bus->b_hnp_enable
? USB_DEVICE_B_HNP_ENABLE
: USB_DEVICE_A_ALT_HNP_SUPPORT,
- 0, NULL, 0, HZ * USB_CTRL_SET_TIMEOUT);
+ 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
if (err < 0) {
/* OTG MESSAGE: report errors here,
* customize to match your product.
* (Includes HNP test device.)
*/
if (udev->bus->b_hnp_enable || udev->bus->is_b_host) {
- static int __usb_suspend_device (struct usb_device *,
- int port1, u32 state);
- err = __usb_suspend_device(udev,
- udev->bus->otg_port,
- PM_SUSPEND_MEM);
+ static int __usb_suspend_device(struct usb_device *,
+ int port1);
+ err = __usb_suspend_device(udev, udev->bus->otg_port);
if (err < 0)
dev_dbg(&udev->dev, "HNP fail, %d\n", err);
}
}
usb_create_sysfs_dev_files (udev);
+ usb_lock_device(udev);
+
/* choose and set the configuration. that registers the interfaces
* 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. */
}
}
/* USB device state == configured ... usable */
+ usb_notify_add_device(udev);
+
+ usb_unlock_device(udev);
- /* add a /proc/bus/usb entry */
- usbfs_add_device(udev);
return 0;
fail:
dev_err(hub->intfdev,
"cannot reset port %d (err = %d)\n",
port1, status);
- else
+ else {
status = hub_port_wait_reset(hub, port1, udev, delay);
+ if (status && status != -ENOTCONN)
+ dev_dbg(hub->intfdev,
+ "port_wait_reset: err = %d\n",
+ status);
+ }
/* return on disconnect or reset */
switch (status) {
case 0:
- /* TRSTRCY = 10 ms */
- msleep(10);
+ /* TRSTRCY = 10 ms; plus some extra */
+ msleep(10 + 40);
/* FALL THROUGH */
case -ENOTCONN:
case -ENODEV:
return status;
}
-static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
-{
- struct usb_device *hdev = hub->hdev;
- int ret;
-
- if (hdev->children[port1-1] && set_state) {
- usb_set_device_state(hdev->children[port1-1],
- USB_STATE_NOTATTACHED);
- }
- ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
- if (ret)
- dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n",
- port1, ret);
-
- return ret;
-}
-
/*
* Disable a port and mark a logical connnect-change event, so that some
* time later khubd will disconnect() any existing usb_device on the port
/* FIXME let caller ask to power down the port:
* - some devices won't enumerate without a VBUS power cycle
* - SRP saves power that way
- * - usb_suspend_device(dev,PM_SUSPEND_DISK)
+ * - ... new call, TBD ...
* That's easy if this hub can switch power per-port, and
* khubd reactivates the port later (timer, SRP, etc).
* Powerdown must be optional, because of reset/DFU.
* NOTE: OTG devices may issue remote wakeup (or SRP) even when
* we don't explicitly enable it here.
*/
- if (udev->actconfig
- // && FIXME (remote wakeup enabled on this bus)
- // ... currently assuming it's always appropriate
- && (udev->actconfig->desc.bmAttributes
- & USB_CONFIG_ATT_WAKEUP) != 0) {
+ if (device_may_wakeup(&udev->dev)) {
status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
USB_DEVICE_REMOTE_WAKEUP, 0,
/*
* Devices on USB hub ports have only one "suspend" state, corresponding
- * to ACPI D2 (PM_SUSPEND_MEM), "may cause the device to lose some context".
+ * to ACPI D2, "may cause the device to lose some context".
* State transitions include:
*
* - suspend, resume ... when the VBUS power link stays live
* Other than re-initializing the hub (plug/unplug, except for root hubs),
* Linux (2.6) currently has NO mechanisms to initiate that: no khubd
* timer, no SRP, no requests through sysfs.
+ *
+ * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
+ * the root hub for their bus goes into global suspend ... so we don't
+ * (falsely) update the device power state to say it suspended.
*/
-int __usb_suspend_device (struct usb_device *udev, int port1, u32 state)
+static int __usb_suspend_device (struct usb_device *udev, int port1)
{
- int status;
+ int status = 0;
/* caller owns the udev device lock */
if (port1 < 0)
return 0;
}
- /* suspend interface drivers; if this is a hub, it
- * suspends the child devices
- */
+ /* all interfaces must already be suspended */
if (udev->actconfig) {
int i;
for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
struct usb_interface *intf;
- struct usb_driver *driver;
intf = udev->actconfig->interface[i];
- if (state <= intf->dev.power.power_state)
- continue;
- if (!intf->dev.driver)
- continue;
- driver = to_usb_driver(intf->dev.driver);
-
- if (driver->suspend) {
- status = driver->suspend(intf, state);
- if (intf->dev.power.power_state != state
- || status)
- dev_err(&intf->dev,
- "suspend %d fail, code %d\n",
- state, status);
- }
-
- /* only drivers with suspend() can ever resume();
- * and after power loss, even they won't.
- * bus_rescan_devices() can rebind drivers later.
- *
- * FIXME the PM core self-deadlocks when unbinding
- * drivers during suspend/resume ... everything grabs
- * dpm_sem (not a spinlock, ugh). we want to unbind,
- * since we know every driver's probe/disconnect works
- * even for drivers that can't suspend.
- */
- if (!driver->suspend || state > PM_SUSPEND_MEM) {
-#if 1
- dev_warn(&intf->dev, "resume is unsafe!\n");
-#else
- down_write(&usb_bus_type.rwsem);
- device_release_driver(&intf->dev);
- up_write(&usb_bus_type.rwsem);
-#endif
+ if (is_active(intf)) {
+ dev_dbg(&intf->dev, "nyet suspended\n");
+ return -EBUSY;
}
}
}
- /*
- * FIXME this needs port power off call paths too, to help force
- * USB into the "generic" PM model. At least for devices on
- * ports that aren't using ganged switching (usually root hubs).
- *
- * NOTE: SRP-capable links should adopt more aggressive poweroff
- * policies (when HNP doesn't apply) once we have mechanisms to
- * turn power back on! (Likely not before 2.7...)
+ /* we only change a device's upstream USB link.
+ * root hubs have no upstream USB link.
*/
- if (state > PM_SUSPEND_MEM) {
- dev_warn(&udev->dev, "no poweroff yet, suspending instead\n");
- }
-
- /* "global suspend" of the HC-to-USB interface (root hub), or
- * "selective suspend" of just one hub-device link.
- */
- if (!udev->parent) {
- struct usb_bus *bus = udev->bus;
- if (bus && bus->op->hub_suspend) {
- status = bus->op->hub_suspend (bus);
- if (status == 0)
- usb_set_device_state(udev,
- USB_STATE_SUSPENDED);
- } else
- status = -EOPNOTSUPP;
- } else
+ if (udev->parent)
status = hub_port_suspend(hdev_to_hub(udev->parent), port1,
udev);
if (status == 0)
- udev->dev.power.power_state = state;
+ udev->dev.power.power_state = PMSG_SUSPEND;
return status;
}
-/**
+#endif
+
+/*
* usb_suspend_device - suspend a usb device
* @udev: device that's no longer in active use
- * @state: PM_SUSPEND_MEM to suspend
- * Context: must be able to sleep; device not locked
+ * 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,
* suspend by the host, using usb_resume_device(). It's also routine
* to disconnect devices while they are suspended.
*
+ * This only affects the USB hardware for a device; its interfaces
+ * (and, for hubs, child devices) must already have been suspended.
+ *
* Suspending OTG devices may trigger HNP, if that's been enabled
* between a pair of dual-role devices. That will change roles, such
* as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
*
* Returns 0 on success, else negative errno.
*/
-int usb_suspend_device(struct usb_device *udev, u32 state)
+int usb_suspend_device(struct usb_device *udev)
{
- int port1, status;
-
- port1 = locktree(udev);
- if (port1 < 0)
- return port1;
-
- status = __usb_suspend_device(udev, port1, state);
- usb_unlock_device(udev);
- return status;
+#ifdef CONFIG_USB_SUSPEND
+ if (udev->state == USB_STATE_NOTATTACHED)
+ return -ENODEV;
+ return __usb_suspend_device(udev, udev->portnum);
+#else
+ /* NOTE: udev->state unchanged, it's not lying ... */
+ udev->dev.power.power_state = PMSG_SUSPEND;
+ return 0;
+#endif
}
/*
+ * If the USB "suspend" state is in use (rather than "global suspend"),
+ * many devices will be individually taken out of suspend state using
+ * special" resume" signaling. These routines kick in shortly after
* hardware resume signaling is finished, either because of selective
* resume (by host) or remote wakeup (by device) ... now see what changed
* in the tree that's rooted at this device.
*/
-static int finish_port_resume(struct usb_device *udev)
+static int finish_device_resume(struct usb_device *udev)
{
int status;
u16 devstatus;
/* caller owns the udev device lock */
- dev_dbg(&udev->dev, "usb resume\n");
+ dev_dbg(&udev->dev, "finish resume\n");
/* usb ch9 identifies four variants of SUSPENDED, based on what
* state the device resumes to. Linux currently won't see the
usb_set_device_state(udev, udev->actconfig
? USB_STATE_CONFIGURED
: USB_STATE_ADDRESS);
- udev->dev.power.power_state = PM_SUSPEND_ON;
+ udev->dev.power.power_state = PMSG_ON;
/* 10.5.4.5 says be sure devices in the tree are still there.
* For now let's assume the device didn't go crazy on resume,
* 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);
else if (udev->actconfig) {
unsigned i;
+ 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),
USB_REQ_CLEAR_FEATURE,
}
/* resume interface drivers; if this is a hub, it
- * resumes the child devices
+ * may have a child resume event to deal with soon
*/
+ resume = udev->dev.bus->resume;
for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
- struct usb_interface *intf;
- struct usb_driver *driver;
+ struct device *dev =
+ &udev->actconfig->interface[i]->dev;
- intf = udev->actconfig->interface[i];
- if (intf->dev.power.power_state == PM_SUSPEND_ON)
- continue;
- if (!intf->dev.driver) {
- /* FIXME maybe force to alt 0 */
- continue;
- }
- driver = to_usb_driver(intf->dev.driver);
-
- /* bus_rescan_devices() may rebind drivers */
- if (!driver->resume)
- continue;
-
- /* can we do better than just logging errors? */
- status = driver->resume(intf);
- if (intf->dev.power.power_state != PM_SUSPEND_ON
- || status)
- dev_dbg(&intf->dev,
- "resume fail, state %d code %d\n",
- intf->dev.power.power_state, status);
+ down(&dev->sem);
+ (void) resume(dev);
+ up(&dev->sem);
}
status = 0;
return status;
}
+#ifdef CONFIG_USB_SUSPEND
+
static int
hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
{
/* TRSMRCY = 10 msec */
msleep(10);
if (udev)
- status = finish_port_resume(udev);
+ status = finish_device_resume(udev);
}
}
if (status < 0)
return status;
}
-static int hub_resume (struct usb_interface *intf);
+#endif
-/**
+/*
* usb_resume_device - re-activate a suspended usb device
* @udev: device to re-activate
- * Context: must be able to sleep; device not locked
+ * Context: must be able to sleep; device not locked; pm locks held
*
* This will re-activate the suspended device, increasing power usage
* while letting drivers communicate again with its endpoints.
*/
int usb_resume_device(struct usb_device *udev)
{
- int port1, status;
+ int status;
- port1 = locktree(udev);
- if (port1 < 0)
- return port1;
+ if (udev->state == USB_STATE_NOTATTACHED)
+ return -ENODEV;
- /* "global resume" of the HC-to-USB interface (root hub), or
- * selective resume of one hub-to-device port
- */
- if (!udev->parent) {
- struct usb_bus *bus = udev->bus;
- if (bus && bus->op->hub_resume) {
- status = bus->op->hub_resume (bus);
+ /* selective resume of one downstream hub-to-device port */
+ if (udev->parent) {
+#ifdef CONFIG_USB_SUSPEND
+ if (udev->state == USB_STATE_SUSPENDED) {
+ // NOTE swsusp may bork us, device state being wrong...
+ // NOTE this fails if parent is also suspended...
+ status = hub_port_resume(hdev_to_hub(udev->parent),
+ udev->portnum, udev);
} else
- status = -EOPNOTSUPP;
- if (status == 0) {
- /* TRSMRCY = 10 msec */
- msleep(10);
- usb_set_device_state (udev, USB_STATE_CONFIGURED);
- status = hub_resume (udev
- ->actconfig->interface[0]);
- }
- } else if (udev->state == USB_STATE_SUSPENDED) {
- // NOTE this fails if parent is also suspended...
- status = hub_port_resume(hdev_to_hub(udev->parent),
- port1, udev);
- } else {
- status = 0;
- }
- if (status < 0) {
+#endif
+ status = 0;
+ } else
+ status = finish_device_resume(udev);
+ if (status < 0)
dev_dbg(&udev->dev, "can't resume, status %d\n",
status);
- }
-
- usb_unlock_device(udev);
/* rebind drivers that had no suspend() */
if (status == 0) {
- usb_lock_all_devices();
+ usb_unlock_device(udev);
bus_rescan_devices(&usb_bus_type);
- usb_unlock_all_devices();
+ usb_lock_device(udev);
}
return status;
}
{
int status = 0;
+#ifdef CONFIG_USB_SUSPEND
+
/* don't repeat RESUME sequence if this device
* was already woken up by some other task
*/
- down(&udev->serialize);
+ usb_lock_device(udev);
if (udev->state == USB_STATE_SUSPENDED) {
dev_dbg(&udev->dev, "RESUME (wakeup)\n");
/* TRSMRCY = 10 msec */
msleep(10);
- status = finish_port_resume(udev);
+ status = finish_device_resume(udev);
}
- up(&udev->serialize);
+ usb_unlock_device(udev);
+#endif
return status;
}
-static int hub_suspend(struct usb_interface *intf, u32 state)
+static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
{
struct usb_hub *hub = usb_get_intfdata (intf);
struct usb_device *hdev = hub->hdev;
unsigned port1;
- int status;
-
- /* stop khubd and related activity */
- hub_quiesce(hub);
- /* then suspend every port */
+ /* fail if children aren't already suspended */
for (port1 = 1; port1 <= hdev->maxchild; port1++) {
struct usb_device *udev;
udev = hdev->children [port1-1];
- if (!udev)
- continue;
- down(&udev->serialize);
- status = __usb_suspend_device(udev, port1, state);
- up(&udev->serialize);
- if (status < 0)
- dev_dbg(&intf->dev, "suspend port %d --> %d\n",
- port1, status);
+ if (udev && (udev->dev.power.power_state.event
+ == PM_EVENT_ON
+#ifdef CONFIG_USB_SUSPEND
+ || udev->state != USB_STATE_SUSPENDED
+#endif
+ )) {
+ dev_dbg(&intf->dev, "port %d nyet suspended\n", port1);
+ return -EBUSY;
+ }
+ }
+
+ /* "global suspend" of the downstream HC-to-USB interface */
+ if (!hdev->parent) {
+ struct usb_bus *bus = hdev->bus;
+ if (bus) {
+ int status = hcd_bus_suspend (bus);
+
+ if (status != 0) {
+ dev_dbg(&hdev->dev, "'global' suspend %d\n",
+ status);
+ return status;
+ }
+ } else
+ return -EOPNOTSUPP;
}
- intf->dev.power.power_state = state;
+ /* stop khubd and related activity */
+ hub_quiesce(hub);
return 0;
}
{
struct usb_device *hdev = interface_to_usbdev(intf);
struct usb_hub *hub = usb_get_intfdata (intf);
- unsigned port1;
int status;
- if (intf->dev.power.power_state == PM_SUSPEND_ON)
- return 0;
+ /* "global resume" of the downstream HC-to-USB interface */
+ if (!hdev->parent) {
+ struct usb_bus *bus = hdev->bus;
+ if (bus) {
+ status = hcd_bus_resume (bus);
+ if (status) {
+ dev_dbg(&intf->dev, "'global' resume %d\n",
+ status);
+ return status;
+ }
+ } else
+ return -EOPNOTSUPP;
+ if (status == 0) {
+ /* TRSMRCY = 10 msec */
+ msleep(10);
+ }
+ }
+
+ hub_activate(hub);
+
+ /* REVISIT: this recursion probably shouldn't exist. Remove
+ * this code sometime, after retesting with different root and
+ * external hubs.
+ */
+#ifdef CONFIG_USB_SUSPEND
+ {
+ unsigned port1;
for (port1 = 1; port1 <= hdev->maxchild; port1++) {
struct usb_device *udev;
if (!udev || status < 0)
continue;
- down (&udev->serialize);
+ usb_lock_device(udev);
if (portstat & USB_PORT_STAT_SUSPEND)
status = hub_port_resume(hub, port1, udev);
else {
- status = finish_port_resume(udev);
+ status = finish_device_resume(udev);
if (status < 0) {
dev_dbg(&intf->dev, "resume port %d --> %d\n",
port1, status);
hub_port_logical_disconnect(hub, port1);
}
}
- up(&udev->serialize);
+ usb_unlock_device(udev);
}
- intf->dev.power.power_state = PM_SUSPEND_ON;
-
- hub_activate(hub);
+ }
+#endif
return 0;
}
-#else /* !CONFIG_USB_SUSPEND */
-
-int usb_suspend_device(struct usb_device *udev, u32 state)
+void usb_suspend_root_hub(struct usb_device *hdev)
{
- return 0;
-}
+ struct usb_hub *hub = hdev_to_hub(hdev);
-int usb_resume_device(struct usb_device *udev)
-{
- return 0;
+ /* This also makes any led blinker stop retriggering. We're called
+ * from irq, so the blinker might still be scheduled. Caller promises
+ * that the root hub status URB will be canceled.
+ */
+ __hub_quiesce(hub);
+ mark_quiesced(to_usb_interface(hub->intfdev));
}
-#define hub_suspend NULL
-#define hub_resume NULL
-#define remote_wakeup(x) 0
-
-#endif /* CONFIG_USB_SUSPEND */
-
-EXPORT_SYMBOL(usb_suspend_device);
-EXPORT_SYMBOL(usb_resume_device);
+void usb_resume_root_hub(struct usb_device *hdev)
+{
+ struct usb_hub *hub = hdev_to_hub(hdev);
+ hub->resume_root_hub = 1;
+ kick_khubd(hub);
+}
/* USB 2.0 spec, 7.1.7.3 / fig 7-29:
return -EINVAL;
retval = usb_control_msg(udev, usb_sndaddr0pipe(),
USB_REQ_SET_ADDRESS, 0, udev->devnum, 0,
- NULL, 0, HZ * USB_CTRL_SET_TIMEOUT);
+ NULL, 0, USB_CTRL_SET_TIMEOUT);
if (retval == 0) {
usb_set_device_state(udev, USB_STATE_ADDRESS);
ep0_reinit(udev);
hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
int retry_counter)
{
- static DECLARE_MUTEX(usb_address0_sem);
+ static DEFINE_MUTEX(usb_address0_mutex);
struct usb_device *hdev = hub->hdev;
int i, j, retval;
if (oldspeed == USB_SPEED_LOW)
delay = HUB_LONG_RESET_TIME;
- down(&usb_address0_sem);
+ mutex_lock(&usb_address0_mutex);
/* Reset the device; full speed may morph to high speed */
retval = hub_port_reset(hub, port1, udev, delay);
retval = -ENOMEM;
continue;
}
- buf->bMaxPacketSize0 = 0;
/* Use a short timeout the first time through,
* so that recalcitrant full-speed devices with
* 8- or 16-byte ep0-maxpackets won't slow things
* down tremendously by NAKing the unexpectedly
- * early status stage. Also, retry on length 0
- * or stall; some devices are flakey.
+ * early status stage. Also, retry on all errors;
+ * some devices are flakey.
*/
for (j = 0; j < 3; ++j) {
+ buf->bMaxPacketSize0 = 0;
r = usb_control_msg(udev, usb_rcvaddr0pipe(),
USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
USB_DT_DEVICE << 8, 0,
buf, GET_DESCRIPTOR_BUFSIZE,
- (i ? HZ * USB_CTRL_GET_TIMEOUT : HZ));
- if (r == 0 || r == -EPIPE)
- continue;
- if (r < 0)
+ (i ? USB_CTRL_GET_TIMEOUT : 1000));
+ switch (buf->bMaxPacketSize0) {
+ case 8: case 16: case 32: case 64:
+ if (buf->bDescriptorType ==
+ USB_DT_DEVICE) {
+ r = 0;
+ break;
+ }
+ /* FALL THROUGH */
+ default:
+ if (r == 0)
+ r = -EPROTO;
+ break;
+ }
+ if (r == 0)
break;
}
udev->descriptor.bMaxPacketSize0 =
retval = -ENODEV;
goto fail;
}
- switch (udev->descriptor.bMaxPacketSize0) {
- case 64: case 32: case 16: case 8:
- break;
- default:
+ if (r) {
dev_err(&udev->dev, "device descriptor "
"read/%s, error %d\n",
"64", r);
fail:
if (retval)
hub_port_disable(hub, port1, 0);
- up(&usb_address0_sem);
+ mutex_unlock(&usb_address0_mutex);
return retval;
}
schedule_work (&hub->leds);
}
}
- kfree (qual);
+ kfree(qual);
}
static unsigned
{
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;
{
struct usb_device *hdev = hub->hdev;
struct device *hub_dev = hub->intfdev;
+ u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
int status, i;
dev_dbg (hub_dev,
if (!(portstatus & USB_PORT_STAT_CONNECTION)) {
/* maybe switch power back on (e.g. root hub was reset) */
- if ((hub->descriptor->wHubCharacteristics
- & HUB_CHAR_LPSM) < 2
+ if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2
&& !(portstatus & (1 << USB_PORT_FEAT_POWER)))
set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
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 "
* udev becomes globally accessible, although presumably
* no one will look at it until hdev is unlocked.
*/
- down (&udev->serialize);
status = 0;
/* We mustn't add new devices if the parent hub has
}
}
- up (&udev->serialize);
if (status)
goto loop_disable;
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;
intf = to_usb_interface(hub->intfdev);
hub_dev = &intf->dev;
- dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n",
+ i = hub->resume_root_hub;
+
+ dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x%s\n",
hdev->state, hub->descriptor
? hub->descriptor->bNbrPorts
: 0,
/* NOTE: expects max 15 ports... */
(u16) hub->change_bits[0],
- (u16) hub->event_bits[0]);
+ (u16) hub->event_bits[0],
+ i ? ", resume root" : "");
usb_get_intf(intf);
spin_unlock_irq(&hub_event_lock);
+ /* Is this is a root hub wanting to reactivate the downstream
+ * ports? If so, be sure the interface resumes even if its
+ * stub "device" node was never suspended.
+ */
+ if (i) {
+ dpm_runtime_resume(&hdev->dev);
+ dpm_runtime_resume(&intf->dev);
+ usb_put_intf(intf);
+ continue;
+ }
+
/* Lock the device, then check to see if we were
* disconnected while waiting for the lock to succeed. */
if (locktree(hdev) < 0) {
usb_put_intf(intf);
continue;
}
- if (hub != usb_get_intfdata(intf) || hub->quiescing)
+ if (hub != usb_get_intfdata(intf))
+ goto loop;
+
+ /* If the hub has died, clean up after it */
+ if (hdev->state == USB_STATE_NOTATTACHED) {
+ hub_pre_reset(hub, 0);
+ goto loop;
+ }
+
+ /* If this is an inactive or suspended hub, do nothing */
+ if (hub->quiescing)
goto loop;
if (hub->error) {
/* deal with port status changes */
for (i = 1; i <= hub->descriptor->bNbrPorts; i++) {
+ if (test_bit(i, hub->busy_bits))
+ continue;
connect_change = test_bit(i, hub->change_bits);
if (!test_and_clear_bit(i, hub->event_bits) &&
- !connect_change)
+ !connect_change && !hub->activating)
continue;
ret = hub_port_status(hub, i,
if (ret < 0)
continue;
+ if (hub->activating && !hdev->children[i-1] &&
+ (portstatus &
+ USB_PORT_STAT_CONNECTION))
+ connect_change = 1;
+
if (portchange & USB_PORT_STAT_C_CONNECTION) {
clear_port_feature(hdev, i,
USB_PORT_FEAT_C_CONNECTION);
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");
}
}
+ hub->activating = 0;
+
+ /* If this is a root hub, tell the HCD it's okay to
+ * re-enable port-change interrupts now. */
+ if (!hdev->parent)
+ usb_enable_root_hub_irq(hdev->bus);
+
loop:
usb_unlock_device(hdev);
usb_put_intf(intf);
static int hub_thread(void *__unused)
{
- /*
- * This thread doesn't need any user-level access,
- * so get rid of all our resources
- */
-
- daemonize("khubd");
- allow_signal(SIGKILL);
-
- /* Send me a signal to get me die (for debugging) */
do {
hub_events();
- wait_event_interruptible(khubd_wait, !list_empty(&hub_event_list));
- try_to_freeze(PF_FREEZE);
- } while (!signal_pending(current));
+ wait_event_interruptible(khubd_wait,
+ !list_empty(&hub_event_list) ||
+ kthread_should_stop());
+ try_to_freeze();
+ } while (!kthread_should_stop() || !list_empty(&hub_event_list));
- pr_debug ("%s: khubd exiting\n", usbcore_name);
- complete_and_exit(&khubd_exited, 0);
+ pr_debug("%s: khubd exiting\n", usbcore_name);
+ return 0;
}
static struct usb_device_id hub_id_table [] = {
MODULE_DEVICE_TABLE (usb, hub_id_table);
static struct usb_driver hub_driver = {
- .owner = THIS_MODULE,
.name = "hub",
.probe = hub_probe,
.disconnect = hub_disconnect,
int usb_hub_init(void)
{
- pid_t pid;
-
if (usb_register(&hub_driver) < 0) {
printk(KERN_ERR "%s: can't register hub driver\n",
usbcore_name);
return -1;
}
- pid = kernel_thread(hub_thread, NULL, CLONE_KERNEL);
- if (pid >= 0) {
- khubd_pid = pid;
-
+ khubd_task = kthread_run(hub_thread, NULL, "khubd");
+ if (!IS_ERR(khubd_task))
return 0;
- }
/* Fall through if kernel_thread failed */
usb_deregister(&hub_driver);
void usb_hub_cleanup(void)
{
- int ret;
-
- /* Kill the thread */
- ret = kill_proc(khubd_pid, SIGKILL, 1);
-
- wait_for_completion(&khubd_exited);
+ kthread_stop(khubd_task);
/*
* Hub resources are freed for us by usb_deregister. It calls
usb_deregister(&hub_driver);
} /* usb_hub_cleanup() */
-
static int config_descriptors_changed(struct usb_device *udev)
{
unsigned index;
struct usb_hub *parent_hub;
struct usb_device_descriptor descriptor = udev->descriptor;
struct usb_hub *hub = NULL;
- int i, ret = 0, port1 = -1;
+ int i, ret = 0;
+ int port1 = udev->portnum;
if (udev->state == USB_STATE_NOTATTACHED ||
udev->state == USB_STATE_SUSPENDED) {
dev_dbg(&udev->dev, "%s for root hub!\n", __FUNCTION__);
return -EISDIR;
}
-
- for (i = 0; i < parent_hdev->maxchild; i++)
- if (parent_hdev->children[i] == udev) {
- port1 = i + 1;
- break;
- }
-
- if (port1 < 0) {
- /* If this ever happens, it's very bad */
- dev_err(&udev->dev, "Can't locate device's port!\n");
- return -ENOENT;
- }
parent_hub = hdev_to_hub(parent_hdev);
/* If we're resetting an active hub, take some special actions */
- if (udev->actconfig &&
+ 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);
+ hub_pre_reset(hub, 0);
}
+ set_bit(port1, parent_hub->busy_bits);
for (i = 0; i < SET_CONFIG_TRIES; ++i) {
/* ep0 maxpacket size may change; let the HCD know about it.
if (ret >= 0)
break;
}
+ clear_bit(port1, parent_hub->busy_bits);
if (ret < 0)
goto re_enumerate;
ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
USB_REQ_SET_CONFIGURATION, 0,
udev->actconfig->desc.bConfigurationValue, 0,
- NULL, 0, HZ * USB_CTRL_SET_TIMEOUT);
+ NULL, 0, USB_CTRL_SET_TIMEOUT);
if (ret < 0) {
dev_err(&udev->dev,
"can't restore configuration #%d (error=%d)\n",
git://git.onelab.eu / linux-2.6.git / blobdiff