--- /dev/null
+/*
+ * (C) Copyright Linus Torvalds 1999
+ * (C) Copyright Johannes Erdfelt 1999-2001
+ * (C) Copyright Andreas Gal 1999
+ * (C) Copyright Gregory P. Smith 1999
+ * (C) Copyright Deti Fliegl 1999
+ * (C) Copyright Randy Dunlap 2000
+ * (C) Copyright David Brownell 2000-2002
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/bcd.h>
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/completion.h>
+#include <linux/utsname.h>
+#include <linux/mm.h>
+#include <asm/io.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/mutex.h>
+#include <asm/irq.h>
+#include <asm/byteorder.h>
+#include <asm/unaligned.h>
+#include <linux/platform_device.h>
+#include <linux/workqueue.h>
+#include <linux/pm_runtime.h>
+#include <linux/types.h>
+
+#include <linux/phy/phy.h>
+#include <linux/usb.h>
+#include <linux/usb/hcd.h>
+#include <linux/usb/phy.h>
+
+#include "usb.h"
+
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * USB Host Controller Driver framework
+ *
+ * Plugs into usbcore (usb_bus) and lets HCDs share code, minimizing
+ * HCD-specific behaviors/bugs.
+ *
+ * This does error checks, tracks devices and urbs, and delegates to a
+ * "hc_driver" only for code (and data) that really needs to know about
+ * hardware differences. That includes root hub registers, i/o queues,
+ * and so on ... but as little else as possible.
+ *
+ * Shared code includes most of the "root hub" code (these are emulated,
+ * though each HC's hardware works differently) and PCI glue, plus request
+ * tracking overhead. The HCD code should only block on spinlocks or on
+ * hardware handshaking; blocking on software events (such as other kernel
+ * threads releasing resources, or completing actions) is all generic.
+ *
+ * Happens the USB 2.0 spec says this would be invisible inside the "USBD",
+ * and includes mostly a "HCDI" (HCD Interface) along with some APIs used
+ * only by the hub driver ... and that neither should be seen or used by
+ * usb client device drivers.
+ *
+ * Contributors of ideas or unattributed patches include: David Brownell,
+ * Roman Weissgaerber, Rory Bolt, Greg Kroah-Hartman, ...
+ *
+ * HISTORY:
+ * 2002-02-21 Pull in most of the usb_bus support from usb.c; some
+ * associated cleanup. "usb_hcd" still != "usb_bus".
+ * 2001-12-12 Initial patch version for Linux 2.5.1 kernel.
+ */
+
+/*-------------------------------------------------------------------------*/
+
+/* Keep track of which host controller drivers are loaded */
+unsigned long usb_hcds_loaded;
+EXPORT_SYMBOL_GPL(usb_hcds_loaded);
+
+/* host controllers we manage */
+LIST_HEAD (usb_bus_list);
+EXPORT_SYMBOL_GPL (usb_bus_list);
+
+/* used when allocating bus numbers */
+#define USB_MAXBUS 64
+static DECLARE_BITMAP(busmap, USB_MAXBUS);
+
+/* used when updating list of hcds */
+DEFINE_MUTEX(usb_bus_list_lock); /* exported only for usbfs */
+EXPORT_SYMBOL_GPL (usb_bus_list_lock);
+
+/* used for controlling access to virtual root hubs */
+static DEFINE_SPINLOCK(hcd_root_hub_lock);
+
+/* used when updating an endpoint's URB list */
+static DEFINE_SPINLOCK(hcd_urb_list_lock);
+
+/* used to protect against unlinking URBs after the device is gone */
+static DEFINE_SPINLOCK(hcd_urb_unlink_lock);
+
+/* wait queue for synchronous unlinks */
+DECLARE_WAIT_QUEUE_HEAD(usb_kill_urb_queue);
+
+static inline int is_root_hub(struct usb_device *udev)
+{
+ return (udev->parent == NULL);
+}
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * Sharable chunks of root hub code.
+ */
+
+/*-------------------------------------------------------------------------*/
+#define KERNEL_REL bin2bcd(((LINUX_VERSION_CODE >> 16) & 0x0ff))
+#define KERNEL_VER bin2bcd(((LINUX_VERSION_CODE >> 8) & 0x0ff))
+
+/* usb 3.0 root hub device descriptor */
+static const u8 usb3_rh_dev_descriptor[18] = {
+ 0x12, /* __u8 bLength; */
+ 0x01, /* __u8 bDescriptorType; Device */
+ 0x00, 0x03, /* __le16 bcdUSB; v3.0 */
+
+ 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */
+ 0x00, /* __u8 bDeviceSubClass; */
+ 0x03, /* __u8 bDeviceProtocol; USB 3.0 hub */
+ 0x09, /* __u8 bMaxPacketSize0; 2^9 = 512 Bytes */
+
+ 0x6b, 0x1d, /* __le16 idVendor; Linux Foundation 0x1d6b */
+ 0x03, 0x00, /* __le16 idProduct; device 0x0003 */
+ KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */
+
+ 0x03, /* __u8 iManufacturer; */
+ 0x02, /* __u8 iProduct; */
+ 0x01, /* __u8 iSerialNumber; */
+ 0x01 /* __u8 bNumConfigurations; */
+};
+
+/* usb 2.5 (wireless USB 1.0) root hub device descriptor */
+static const u8 usb25_rh_dev_descriptor[18] = {
+ 0x12, /* __u8 bLength; */
+ 0x01, /* __u8 bDescriptorType; Device */
+ 0x50, 0x02, /* __le16 bcdUSB; v2.5 */
+
+ 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */
+ 0x00, /* __u8 bDeviceSubClass; */
+ 0x00, /* __u8 bDeviceProtocol; [ usb 2.0 no TT ] */
+ 0xFF, /* __u8 bMaxPacketSize0; always 0xFF (WUSB Spec 7.4.1). */
+
+ 0x6b, 0x1d, /* __le16 idVendor; Linux Foundation 0x1d6b */
+ 0x02, 0x00, /* __le16 idProduct; device 0x0002 */
+ KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */
+
+ 0x03, /* __u8 iManufacturer; */
+ 0x02, /* __u8 iProduct; */
+ 0x01, /* __u8 iSerialNumber; */
+ 0x01 /* __u8 bNumConfigurations; */
+};
+
+/* usb 2.0 root hub device descriptor */
+static const u8 usb2_rh_dev_descriptor[18] = {
+ 0x12, /* __u8 bLength; */
+ 0x01, /* __u8 bDescriptorType; Device */
+ 0x00, 0x02, /* __le16 bcdUSB; v2.0 */
+
+ 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */
+ 0x00, /* __u8 bDeviceSubClass; */
+ 0x00, /* __u8 bDeviceProtocol; [ usb 2.0 no TT ] */
+ 0x40, /* __u8 bMaxPacketSize0; 64 Bytes */
+
+ 0x6b, 0x1d, /* __le16 idVendor; Linux Foundation 0x1d6b */
+ 0x02, 0x00, /* __le16 idProduct; device 0x0002 */
+ KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */
+
+ 0x03, /* __u8 iManufacturer; */
+ 0x02, /* __u8 iProduct; */
+ 0x01, /* __u8 iSerialNumber; */
+ 0x01 /* __u8 bNumConfigurations; */
+};
+
+/* no usb 2.0 root hub "device qualifier" descriptor: one speed only */
+
+/* usb 1.1 root hub device descriptor */
+static const u8 usb11_rh_dev_descriptor[18] = {
+ 0x12, /* __u8 bLength; */
+ 0x01, /* __u8 bDescriptorType; Device */
+ 0x10, 0x01, /* __le16 bcdUSB; v1.1 */
+
+ 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */
+ 0x00, /* __u8 bDeviceSubClass; */
+ 0x00, /* __u8 bDeviceProtocol; [ low/full speeds only ] */
+ 0x40, /* __u8 bMaxPacketSize0; 64 Bytes */
+
+ 0x6b, 0x1d, /* __le16 idVendor; Linux Foundation 0x1d6b */
+ 0x01, 0x00, /* __le16 idProduct; device 0x0001 */
+ KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */
+
+ 0x03, /* __u8 iManufacturer; */
+ 0x02, /* __u8 iProduct; */
+ 0x01, /* __u8 iSerialNumber; */
+ 0x01 /* __u8 bNumConfigurations; */
+};
+
+
+/*-------------------------------------------------------------------------*/
+
+/* Configuration descriptors for our root hubs */
+
+static const u8 fs_rh_config_descriptor[] = {
+
+ /* one configuration */
+ 0x09, /* __u8 bLength; */
+ 0x02, /* __u8 bDescriptorType; Configuration */
+ 0x19, 0x00, /* __le16 wTotalLength; */
+ 0x01, /* __u8 bNumInterfaces; (1) */
+ 0x01, /* __u8 bConfigurationValue; */
+ 0x00, /* __u8 iConfiguration; */
+ 0xc0, /* __u8 bmAttributes;
+ Bit 7: must be set,
+ 6: Self-powered,
+ 5: Remote wakeup,
+ 4..0: resvd */
+ 0x00, /* __u8 MaxPower; */
+
+ /* USB 1.1:
+ * USB 2.0, single TT organization (mandatory):
+ * one interface, protocol 0
+ *
+ * USB 2.0, multiple TT organization (optional):
+ * two interfaces, protocols 1 (like single TT)
+ * and 2 (multiple TT mode) ... config is
+ * sometimes settable
+ * NOT IMPLEMENTED
+ */
+
+ /* one interface */
+ 0x09, /* __u8 if_bLength; */
+ 0x04, /* __u8 if_bDescriptorType; Interface */
+ 0x00, /* __u8 if_bInterfaceNumber; */
+ 0x00, /* __u8 if_bAlternateSetting; */
+ 0x01, /* __u8 if_bNumEndpoints; */
+ 0x09, /* __u8 if_bInterfaceClass; HUB_CLASSCODE */
+ 0x00, /* __u8 if_bInterfaceSubClass; */
+ 0x00, /* __u8 if_bInterfaceProtocol; [usb1.1 or single tt] */
+ 0x00, /* __u8 if_iInterface; */
+
+ /* one endpoint (status change endpoint) */
+ 0x07, /* __u8 ep_bLength; */
+ 0x05, /* __u8 ep_bDescriptorType; Endpoint */
+ 0x81, /* __u8 ep_bEndpointAddress; IN Endpoint 1 */
+ 0x03, /* __u8 ep_bmAttributes; Interrupt */
+ 0x02, 0x00, /* __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8) */
+ 0xff /* __u8 ep_bInterval; (255ms -- usb 2.0 spec) */
+};
+
+static const u8 hs_rh_config_descriptor[] = {
+
+ /* one configuration */
+ 0x09, /* __u8 bLength; */
+ 0x02, /* __u8 bDescriptorType; Configuration */
+ 0x19, 0x00, /* __le16 wTotalLength; */
+ 0x01, /* __u8 bNumInterfaces; (1) */
+ 0x01, /* __u8 bConfigurationValue; */
+ 0x00, /* __u8 iConfiguration; */
+ 0xc0, /* __u8 bmAttributes;
+ Bit 7: must be set,
+ 6: Self-powered,
+ 5: Remote wakeup,
+ 4..0: resvd */
+ 0x00, /* __u8 MaxPower; */
+
+ /* USB 1.1:
+ * USB 2.0, single TT organization (mandatory):
+ * one interface, protocol 0
+ *
+ * USB 2.0, multiple TT organization (optional):
+ * two interfaces, protocols 1 (like single TT)
+ * and 2 (multiple TT mode) ... config is
+ * sometimes settable
+ * NOT IMPLEMENTED
+ */
+
+ /* one interface */
+ 0x09, /* __u8 if_bLength; */
+ 0x04, /* __u8 if_bDescriptorType; Interface */
+ 0x00, /* __u8 if_bInterfaceNumber; */
+ 0x00, /* __u8 if_bAlternateSetting; */
+ 0x01, /* __u8 if_bNumEndpoints; */
+ 0x09, /* __u8 if_bInterfaceClass; HUB_CLASSCODE */
+ 0x00, /* __u8 if_bInterfaceSubClass; */
+ 0x00, /* __u8 if_bInterfaceProtocol; [usb1.1 or single tt] */
+ 0x00, /* __u8 if_iInterface; */
+
+ /* one endpoint (status change endpoint) */
+ 0x07, /* __u8 ep_bLength; */
+ 0x05, /* __u8 ep_bDescriptorType; Endpoint */
+ 0x81, /* __u8 ep_bEndpointAddress; IN Endpoint 1 */
+ 0x03, /* __u8 ep_bmAttributes; Interrupt */
+ /* __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8)
+ * see hub.c:hub_configure() for details. */
+ (USB_MAXCHILDREN + 1 + 7) / 8, 0x00,
+ 0x0c /* __u8 ep_bInterval; (256ms -- usb 2.0 spec) */
+};
+
+static const u8 ss_rh_config_descriptor[] = {
+ /* one configuration */
+ 0x09, /* __u8 bLength; */
+ 0x02, /* __u8 bDescriptorType; Configuration */
+ 0x1f, 0x00, /* __le16 wTotalLength; */
+ 0x01, /* __u8 bNumInterfaces; (1) */
+ 0x01, /* __u8 bConfigurationValue; */
+ 0x00, /* __u8 iConfiguration; */
+ 0xc0, /* __u8 bmAttributes;
+ Bit 7: must be set,
+ 6: Self-powered,
+ 5: Remote wakeup,
+ 4..0: resvd */
+ 0x00, /* __u8 MaxPower; */
+
+ /* one interface */
+ 0x09, /* __u8 if_bLength; */
+ 0x04, /* __u8 if_bDescriptorType; Interface */
+ 0x00, /* __u8 if_bInterfaceNumber; */
+ 0x00, /* __u8 if_bAlternateSetting; */
+ 0x01, /* __u8 if_bNumEndpoints; */
+ 0x09, /* __u8 if_bInterfaceClass; HUB_CLASSCODE */
+ 0x00, /* __u8 if_bInterfaceSubClass; */
+ 0x00, /* __u8 if_bInterfaceProtocol; */
+ 0x00, /* __u8 if_iInterface; */
+
+ /* one endpoint (status change endpoint) */
+ 0x07, /* __u8 ep_bLength; */
+ 0x05, /* __u8 ep_bDescriptorType; Endpoint */
+ 0x81, /* __u8 ep_bEndpointAddress; IN Endpoint 1 */
+ 0x03, /* __u8 ep_bmAttributes; Interrupt */
+ /* __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8)
+ * see hub.c:hub_configure() for details. */
+ (USB_MAXCHILDREN + 1 + 7) / 8, 0x00,
+ 0x0c, /* __u8 ep_bInterval; (256ms -- usb 2.0 spec) */
+
+ /* one SuperSpeed endpoint companion descriptor */
+ 0x06, /* __u8 ss_bLength */
+ 0x30, /* __u8 ss_bDescriptorType; SuperSpeed EP Companion */
+ 0x00, /* __u8 ss_bMaxBurst; allows 1 TX between ACKs */
+ 0x00, /* __u8 ss_bmAttributes; 1 packet per service interval */
+ 0x02, 0x00 /* __le16 ss_wBytesPerInterval; 15 bits for max 15 ports */
+};
+
+/* authorized_default behaviour:
+ * -1 is authorized for all devices except wireless (old behaviour)
+ * 0 is unauthorized for all devices
+ * 1 is authorized for all devices
+ */
+static int authorized_default = -1;
+module_param(authorized_default, int, S_IRUGO|S_IWUSR);
+MODULE_PARM_DESC(authorized_default,
+ "Default USB device authorization: 0 is not authorized, 1 is "
+ "authorized, -1 is authorized except for wireless USB (default, "
+ "old behaviour");
+/*-------------------------------------------------------------------------*/
+
+/**
+ * ascii2desc() - Helper routine for producing UTF-16LE string descriptors
+ * @s: Null-terminated ASCII (actually ISO-8859-1) string
+ * @buf: Buffer for USB string descriptor (header + UTF-16LE)
+ * @len: Length (in bytes; may be odd) of descriptor buffer.
+ *
+ * Return: The number of bytes filled in: 2 + 2*strlen(s) or @len,
+ * whichever is less.
+ *
+ * Note:
+ * USB String descriptors can contain at most 126 characters; input
+ * strings longer than that are truncated.
+ */
+static unsigned
+ascii2desc(char const *s, u8 *buf, unsigned len)
+{
+ unsigned n, t = 2 + 2*strlen(s);
+
+ if (t > 254)
+ t = 254; /* Longest possible UTF string descriptor */
+ if (len > t)
+ len = t;
+
+ t += USB_DT_STRING << 8; /* Now t is first 16 bits to store */
+
+ n = len;
+ while (n--) {
+ *buf++ = t;
+ if (!n--)
+ break;
+ *buf++ = t >> 8;
+ t = (unsigned char)*s++;
+ }
+ return len;
+}
+
+/**
+ * rh_string() - provides string descriptors for root hub
+ * @id: the string ID number (0: langids, 1: serial #, 2: product, 3: vendor)
+ * @hcd: the host controller for this root hub
+ * @data: buffer for output packet
+ * @len: length of the provided buffer
+ *
+ * Produces either a manufacturer, product or serial number string for the
+ * virtual root hub device.
+ *
+ * Return: The number of bytes filled in: the length of the descriptor or
+ * of the provided buffer, whichever is less.
+ */
+static unsigned
+rh_string(int id, struct usb_hcd const *hcd, u8 *data, unsigned len)
+{
+ char buf[100];
+ char const *s;
+ static char const langids[4] = {4, USB_DT_STRING, 0x09, 0x04};
+
+ /* language ids */
+ switch (id) {
+ case 0:
+ /* Array of LANGID codes (0x0409 is MSFT-speak for "en-us") */
+ /* See http://www.usb.org/developers/docs/USB_LANGIDs.pdf */
+ if (len > 4)
+ len = 4;
+ memcpy(data, langids, len);
+ return len;
+ case 1:
+ /* Serial number */
+ s = hcd->self.bus_name;
+ break;
+ case 2:
+ /* Product name */
+ s = hcd->product_desc;
+ break;
+ case 3:
+ /* Manufacturer */
+ snprintf (buf, sizeof buf, "%s %s %s", init_utsname()->sysname,
+ init_utsname()->release, hcd->driver->description);
+ s = buf;
+ break;
+ default:
+ /* Can't happen; caller guarantees it */
+ return 0;
+ }
+
+ return ascii2desc(s, data, len);
+}
+
+
+/* Root hub control transfers execute synchronously */
+static int rh_call_control (struct usb_hcd *hcd, struct urb *urb)
+{
+ struct usb_ctrlrequest *cmd;
+ u16 typeReq, wValue, wIndex, wLength;
+ u8 *ubuf = urb->transfer_buffer;
+ unsigned len = 0;
+ int status;
+ u8 patch_wakeup = 0;
+ u8 patch_protocol = 0;
+ u16 tbuf_size;
+ u8 *tbuf = NULL;
+ const u8 *bufp;
+
+ might_sleep();
+
+ spin_lock_irq(&hcd_root_hub_lock);
+ status = usb_hcd_link_urb_to_ep(hcd, urb);
+ spin_unlock_irq(&hcd_root_hub_lock);
+ if (status)
+ return status;
+ urb->hcpriv = hcd; /* Indicate it's queued */
+
+ cmd = (struct usb_ctrlrequest *) urb->setup_packet;
+ typeReq = (cmd->bRequestType << 8) | cmd->bRequest;
+ wValue = le16_to_cpu (cmd->wValue);
+ wIndex = le16_to_cpu (cmd->wIndex);
+ wLength = le16_to_cpu (cmd->wLength);
+
+ if (wLength > urb->transfer_buffer_length)
+ goto error;
+
+ /*
+ * tbuf should be at least as big as the
+ * USB hub descriptor.
+ */
+ tbuf_size = max_t(u16, sizeof(struct usb_hub_descriptor), wLength);
+ tbuf = kzalloc(tbuf_size, GFP_KERNEL);
+ if (!tbuf)
+ return -ENOMEM;
+
+ bufp = tbuf;
+
+
+ urb->actual_length = 0;
+ switch (typeReq) {
+
+ /* DEVICE REQUESTS */
+
+ /* The root hub's remote wakeup enable bit is implemented using
+ * driver model wakeup flags. If this system supports wakeup
+ * through USB, userspace may change the default "allow wakeup"
+ * policy through sysfs or these calls.
+ *
+ * Most root hubs support wakeup from downstream devices, for
+ * runtime power management (disabling USB clocks and reducing
+ * VBUS power usage). However, not all of them do so; silicon,
+ * board, and BIOS bugs here are not uncommon, so these can't
+ * be treated quite like external hubs.
+ *
+ * Likewise, not all root hubs will pass wakeup events upstream,
+ * to wake up the whole system. So don't assume root hub and
+ * controller capabilities are identical.
+ */
+
+ case DeviceRequest | USB_REQ_GET_STATUS:
+ tbuf[0] = (device_may_wakeup(&hcd->self.root_hub->dev)
+ << USB_DEVICE_REMOTE_WAKEUP)
+ | (1 << USB_DEVICE_SELF_POWERED);
+ tbuf[1] = 0;
+ len = 2;
+ break;
+ case DeviceOutRequest | USB_REQ_CLEAR_FEATURE:
+ if (wValue == USB_DEVICE_REMOTE_WAKEUP)
+ device_set_wakeup_enable(&hcd->self.root_hub->dev, 0);
+ else
+ goto error;
+ break;
+ case DeviceOutRequest | USB_REQ_SET_FEATURE:
+ if (device_can_wakeup(&hcd->self.root_hub->dev)
+ && wValue == USB_DEVICE_REMOTE_WAKEUP)
+ device_set_wakeup_enable(&hcd->self.root_hub->dev, 1);
+ else
+ goto error;
+ break;
+ case DeviceRequest | USB_REQ_GET_CONFIGURATION:
+ tbuf[0] = 1;
+ len = 1;
+ /* FALLTHROUGH */
+ case DeviceOutRequest | USB_REQ_SET_CONFIGURATION:
+ break;
+ case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
+ switch (wValue & 0xff00) {
+ case USB_DT_DEVICE << 8:
+ switch (hcd->speed) {
+ case HCD_USB3:
+ bufp = usb3_rh_dev_descriptor;
+ break;
+ case HCD_USB25:
+ bufp = usb25_rh_dev_descriptor;
+ break;
+ case HCD_USB2:
+ bufp = usb2_rh_dev_descriptor;
+ break;
+ case HCD_USB11:
+ bufp = usb11_rh_dev_descriptor;
+ break;
+ default:
+ goto error;
+ }
+ len = 18;
+ if (hcd->has_tt)
+ patch_protocol = 1;
+ break;
+ case USB_DT_CONFIG << 8:
+ switch (hcd->speed) {
+ case HCD_USB3:
+ bufp = ss_rh_config_descriptor;
+ len = sizeof ss_rh_config_descriptor;
+ break;
+ case HCD_USB25:
+ case HCD_USB2:
+ bufp = hs_rh_config_descriptor;
+ len = sizeof hs_rh_config_descriptor;
+ break;
+ case HCD_USB11:
+ bufp = fs_rh_config_descriptor;
+ len = sizeof fs_rh_config_descriptor;
+ break;
+ default:
+ goto error;
+ }
+ if (device_can_wakeup(&hcd->self.root_hub->dev))
+ patch_wakeup = 1;
+ break;
+ case USB_DT_STRING << 8:
+ if ((wValue & 0xff) < 4)
+ urb->actual_length = rh_string(wValue & 0xff,
+ hcd, ubuf, wLength);
+ else /* unsupported IDs --> "protocol stall" */
+ goto error;
+ break;
+ case USB_DT_BOS << 8:
+ goto nongeneric;
+ default:
+ goto error;
+ }
+ break;
+ case DeviceRequest | USB_REQ_GET_INTERFACE:
+ tbuf[0] = 0;
+ len = 1;
+ /* FALLTHROUGH */
+ case DeviceOutRequest | USB_REQ_SET_INTERFACE:
+ break;
+ case DeviceOutRequest | USB_REQ_SET_ADDRESS:
+ /* wValue == urb->dev->devaddr */
+ dev_dbg (hcd->self.controller, "root hub device address %d\n",
+ wValue);
+ break;
+
+ /* INTERFACE REQUESTS (no defined feature/status flags) */
+
+ /* ENDPOINT REQUESTS */
+
+ case EndpointRequest | USB_REQ_GET_STATUS:
+ /* ENDPOINT_HALT flag */
+ tbuf[0] = 0;
+ tbuf[1] = 0;
+ len = 2;
+ /* FALLTHROUGH */
+ case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
+ case EndpointOutRequest | USB_REQ_SET_FEATURE:
+ dev_dbg (hcd->self.controller, "no endpoint features yet\n");
+ break;
+
+ /* CLASS REQUESTS (and errors) */
+
+ default:
+nongeneric:
+ /* non-generic request */
+ switch (typeReq) {
+ case GetHubStatus:
+ case GetPortStatus:
+ len = 4;
+ break;
+ case GetHubDescriptor:
+ len = sizeof (struct usb_hub_descriptor);
+ break;
+ case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
+ /* len is returned by hub_control */
+ break;
+ }
+ status = hcd->driver->hub_control (hcd,
+ typeReq, wValue, wIndex,
+ tbuf, wLength);
+
+ if (typeReq == GetHubDescriptor)
+ usb_hub_adjust_deviceremovable(hcd->self.root_hub,
+ (struct usb_hub_descriptor *)tbuf);
+ break;
+error:
+ /* "protocol stall" on error */
+ status = -EPIPE;
+ }
+
+ if (status < 0) {
+ len = 0;
+ if (status != -EPIPE) {
+ dev_dbg (hcd->self.controller,
+ "CTRL: TypeReq=0x%x val=0x%x "
+ "idx=0x%x len=%d ==> %d\n",
+ typeReq, wValue, wIndex,
+ wLength, status);
+ }
+ } else if (status > 0) {
+ /* hub_control may return the length of data copied. */
+ len = status;
+ status = 0;
+ }
+ if (len) {
+ if (urb->transfer_buffer_length < len)
+ len = urb->transfer_buffer_length;
+ urb->actual_length = len;
+ /* always USB_DIR_IN, toward host */
+ memcpy (ubuf, bufp, len);
+
+ /* report whether RH hardware supports remote wakeup */
+ if (patch_wakeup &&
+ len > offsetof (struct usb_config_descriptor,
+ bmAttributes))
+ ((struct usb_config_descriptor *)ubuf)->bmAttributes
+ |= USB_CONFIG_ATT_WAKEUP;
+
+ /* report whether RH hardware has an integrated TT */
+ if (patch_protocol &&
+ len > offsetof(struct usb_device_descriptor,
+ bDeviceProtocol))
+ ((struct usb_device_descriptor *) ubuf)->
+ bDeviceProtocol = USB_HUB_PR_HS_SINGLE_TT;
+ }
+
+ kfree(tbuf);
+
+ /* any errors get returned through the urb completion */
+ spin_lock_irq(&hcd_root_hub_lock);
+ usb_hcd_unlink_urb_from_ep(hcd, urb);
+ usb_hcd_giveback_urb(hcd, urb, status);
+ spin_unlock_irq(&hcd_root_hub_lock);
+ return 0;
+}
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * Root Hub interrupt transfers are polled using a timer if the
+ * driver requests it; otherwise the driver is responsible for
+ * calling usb_hcd_poll_rh_status() when an event occurs.
+ *
+ * Completions are called in_interrupt(), but they may or may not
+ * be in_irq().
+ */
+void usb_hcd_poll_rh_status(struct usb_hcd *hcd)
+{
+ struct urb *urb;
+ int length;
+ unsigned long flags;
+ char buffer[6]; /* Any root hubs with > 31 ports? */
+
+ if (unlikely(!hcd->rh_pollable))
+ return;
+ if (!hcd->uses_new_polling && !hcd->status_urb)
+ return;
+
+ length = hcd->driver->hub_status_data(hcd, buffer);
+ if (length > 0) {
+
+ /* try to complete the status urb */
+ spin_lock_irqsave(&hcd_root_hub_lock, flags);
+ urb = hcd->status_urb;
+ if (urb) {
+ clear_bit(HCD_FLAG_POLL_PENDING, &hcd->flags);
+ hcd->status_urb = NULL;
+ urb->actual_length = length;
+ memcpy(urb->transfer_buffer, buffer, length);
+
+ usb_hcd_unlink_urb_from_ep(hcd, urb);
+ usb_hcd_giveback_urb(hcd, urb, 0);
+ } else {
+ length = 0;
+ set_bit(HCD_FLAG_POLL_PENDING, &hcd->flags);
+ }
+ spin_unlock_irqrestore(&hcd_root_hub_lock, flags);
+ }
+
+ /* The USB 2.0 spec says 256 ms. This is close enough and won't
+ * exceed that limit if HZ is 100. The math is more clunky than
+ * maybe expected, this is to make sure that all timers for USB devices
+ * fire at the same time to give the CPU a break in between */
+ if (hcd->uses_new_polling ? HCD_POLL_RH(hcd) :
+ (length == 0 && hcd->status_urb != NULL))
+ mod_timer (&hcd->rh_timer, (jiffies/(HZ/4) + 1) * (HZ/4));
+}
+EXPORT_SYMBOL_GPL(usb_hcd_poll_rh_status);
+
+/* timer callback */
+static void rh_timer_func (unsigned long _hcd)
+{
+ usb_hcd_poll_rh_status((struct usb_hcd *) _hcd);
+}
+
+/*-------------------------------------------------------------------------*/
+
+static int rh_queue_status (struct usb_hcd *hcd, struct urb *urb)
+{
+ int retval;
+ unsigned long flags;
+ unsigned len = 1 + (urb->dev->maxchild / 8);
+
+ spin_lock_irqsave (&hcd_root_hub_lock, flags);
+ if (hcd->status_urb || urb->transfer_buffer_length < len) {
+ dev_dbg (hcd->self.controller, "not queuing rh status urb\n");
+ retval = -EINVAL;
+ goto done;
+ }
+
+ retval = usb_hcd_link_urb_to_ep(hcd, urb);
+ if (retval)
+ goto done;
+
+ hcd->status_urb = urb;
+ urb->hcpriv = hcd; /* indicate it's queued */
+ if (!hcd->uses_new_polling)
+ mod_timer(&hcd->rh_timer, (jiffies/(HZ/4) + 1) * (HZ/4));
+
+ /* If a status change has already occurred, report it ASAP */
+ else if (HCD_POLL_PENDING(hcd))
+ mod_timer(&hcd->rh_timer, jiffies);
+ retval = 0;
+ done:
+ spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
+ return retval;
+}
+
+static int rh_urb_enqueue (struct usb_hcd *hcd, struct urb *urb)
+{
+ if (usb_endpoint_xfer_int(&urb->ep->desc))
+ return rh_queue_status (hcd, urb);
+ if (usb_endpoint_xfer_control(&urb->ep->desc))
+ return rh_call_control (hcd, urb);
+ return -EINVAL;
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* Unlinks of root-hub control URBs are legal, but they don't do anything
+ * since these URBs always execute synchronously.
+ */
+static int usb_rh_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
+{
+ unsigned long flags;
+ int rc;
+
+ spin_lock_irqsave(&hcd_root_hub_lock, flags);
+ rc = usb_hcd_check_unlink_urb(hcd, urb, status);
+ if (rc)
+ goto done;
+
+ if (usb_endpoint_num(&urb->ep->desc) == 0) { /* Control URB */
+ ; /* Do nothing */
+
+ } else { /* Status URB */
+ if (!hcd->uses_new_polling)
+ del_timer (&hcd->rh_timer);
+ if (urb == hcd->status_urb) {
+ hcd->status_urb = NULL;
+ usb_hcd_unlink_urb_from_ep(hcd, urb);
+ usb_hcd_giveback_urb(hcd, urb, status);
+ }
+ }
+ done:
+ spin_unlock_irqrestore(&hcd_root_hub_lock, flags);
+ return rc;
+}
+
+
+
+/*
+ * Show & store the current value of authorized_default
+ */
+static ssize_t authorized_default_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct usb_device *rh_usb_dev = to_usb_device(dev);
+ struct usb_bus *usb_bus = rh_usb_dev->bus;
+ struct usb_hcd *usb_hcd;
+
+ usb_hcd = bus_to_hcd(usb_bus);
+ return snprintf(buf, PAGE_SIZE, "%u\n", usb_hcd->authorized_default);
+}
+
+static ssize_t authorized_default_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t size)
+{
+ ssize_t result;
+ unsigned val;
+ struct usb_device *rh_usb_dev = to_usb_device(dev);
+ struct usb_bus *usb_bus = rh_usb_dev->bus;
+ struct usb_hcd *usb_hcd;
+
+ usb_hcd = bus_to_hcd(usb_bus);
+ result = sscanf(buf, "%u\n", &val);
+ if (result == 1) {
+ usb_hcd->authorized_default = val ? 1 : 0;
+ result = size;
+ } else {
+ result = -EINVAL;
+ }
+ return result;
+}
+static DEVICE_ATTR_RW(authorized_default);
+
+/* Group all the USB bus attributes */
+static struct attribute *usb_bus_attrs[] = {
+ &dev_attr_authorized_default.attr,
+ NULL,
+};
+
+static struct attribute_group usb_bus_attr_group = {
+ .name = NULL, /* we want them in the same directory */
+ .attrs = usb_bus_attrs,
+};
+
+
+
+/*-------------------------------------------------------------------------*/
+
+/**
+ * usb_bus_init - shared initialization code
+ * @bus: the bus structure being initialized
+ *
+ * This code is used to initialize a usb_bus structure, memory for which is
+ * separately managed.
+ */
+static void usb_bus_init (struct usb_bus *bus)
+{
+ memset (&bus->devmap, 0, sizeof(struct usb_devmap));
+
+ bus->devnum_next = 1;
+
+ bus->root_hub = NULL;
+ bus->busnum = -1;
+ bus->bandwidth_allocated = 0;
+ bus->bandwidth_int_reqs = 0;
+ bus->bandwidth_isoc_reqs = 0;
+ mutex_init(&bus->usb_address0_mutex);
+
+ INIT_LIST_HEAD (&bus->bus_list);
+}
+
+/*-------------------------------------------------------------------------*/
+
+/**
+ * usb_register_bus - registers the USB host controller with the usb core
+ * @bus: pointer to the bus to register
+ * Context: !in_interrupt()
+ *
+ * Assigns a bus number, and links the controller into usbcore data
+ * structures so that it can be seen by scanning the bus list.
+ *
+ * Return: 0 if successful. A negative error code otherwise.
+ */
+static int usb_register_bus(struct usb_bus *bus)
+{
+ int result = -E2BIG;
+ int busnum;
+
+ mutex_lock(&usb_bus_list_lock);
+ busnum = find_next_zero_bit(busmap, USB_MAXBUS, 1);
+ if (busnum >= USB_MAXBUS) {
+ printk (KERN_ERR "%s: too many buses\n", usbcore_name);
+ goto error_find_busnum;
+ }
+ set_bit(busnum, busmap);
+ bus->busnum = busnum;
+
+ /* Add it to the local list of buses */
+ list_add (&bus->bus_list, &usb_bus_list);
+ mutex_unlock(&usb_bus_list_lock);
+
+ usb_notify_add_bus(bus);
+
+ dev_info (bus->controller, "new USB bus registered, assigned bus "
+ "number %d\n", bus->busnum);
+ return 0;
+
+error_find_busnum:
+ mutex_unlock(&usb_bus_list_lock);
+ return result;
+}
+
+/**
+ * usb_deregister_bus - deregisters the USB host controller
+ * @bus: pointer to the bus to deregister
+ * Context: !in_interrupt()
+ *
+ * Recycles the bus number, and unlinks the controller from usbcore data
+ * structures so that it won't be seen by scanning the bus list.
+ */
+static void usb_deregister_bus (struct usb_bus *bus)
+{
+ dev_info (bus->controller, "USB bus %d deregistered\n", bus->busnum);
+
+ /*
+ * NOTE: make sure that all the devices are removed by the
+ * controller code, as well as having it call this when cleaning
+ * itself up
+ */
+ mutex_lock(&usb_bus_list_lock);
+ list_del (&bus->bus_list);
+ mutex_unlock(&usb_bus_list_lock);
+
+ usb_notify_remove_bus(bus);
+
+ clear_bit(bus->busnum, busmap);
+}
+
+/**
+ * register_root_hub - called by usb_add_hcd() to register a root hub
+ * @hcd: host controller for this root hub
+ *
+ * This function registers the root hub with the USB subsystem. It sets up
+ * the device properly in the device tree and then calls usb_new_device()
+ * to register the usb device. It also assigns the root hub's USB address
+ * (always 1).
+ *
+ * Return: 0 if successful. A negative error code otherwise.
+ */
+static int register_root_hub(struct usb_hcd *hcd)
+{
+ struct device *parent_dev = hcd->self.controller;
+ struct usb_device *usb_dev = hcd->self.root_hub;
+ const int devnum = 1;
+ int retval;
+
+ usb_dev->devnum = devnum;
+ usb_dev->bus->devnum_next = devnum + 1;
+ memset (&usb_dev->bus->devmap.devicemap, 0,
+ sizeof usb_dev->bus->devmap.devicemap);
+ set_bit (devnum, usb_dev->bus->devmap.devicemap);
+ usb_set_device_state(usb_dev, USB_STATE_ADDRESS);
+
+ mutex_lock(&usb_bus_list_lock);
+
+ usb_dev->ep0.desc.wMaxPacketSize = cpu_to_le16(64);
+ retval = usb_get_device_descriptor(usb_dev, USB_DT_DEVICE_SIZE);
+ if (retval != sizeof usb_dev->descriptor) {
+ mutex_unlock(&usb_bus_list_lock);
+ dev_dbg (parent_dev, "can't read %s device descriptor %d\n",
+ dev_name(&usb_dev->dev), retval);
+ return (retval < 0) ? retval : -EMSGSIZE;
+ }
+ if (usb_dev->speed == USB_SPEED_SUPER) {
+ retval = usb_get_bos_descriptor(usb_dev);
+ if (retval < 0) {
+ mutex_unlock(&usb_bus_list_lock);
+ dev_dbg(parent_dev, "can't read %s bos descriptor %d\n",
+ dev_name(&usb_dev->dev), retval);
+ return retval;
+ }
+ }
+
+ retval = usb_new_device (usb_dev);
+ if (retval) {
+ dev_err (parent_dev, "can't register root hub for %s, %d\n",
+ dev_name(&usb_dev->dev), retval);
+ } else {
+ spin_lock_irq (&hcd_root_hub_lock);
+ hcd->rh_registered = 1;
+ spin_unlock_irq (&hcd_root_hub_lock);
+
+ /* Did the HC die before the root hub was registered? */
+ if (HCD_DEAD(hcd))
+ usb_hc_died (hcd); /* This time clean up */
+ }
+ mutex_unlock(&usb_bus_list_lock);
+
+ return retval;
+}
+
+/*
+ * usb_hcd_start_port_resume - a root-hub port is sending a resume signal
+ * @bus: the bus which the root hub belongs to
+ * @portnum: the port which is being resumed
+ *
+ * HCDs should call this function when they know that a resume signal is
+ * being sent to a root-hub port. The root hub will be prevented from
+ * going into autosuspend until usb_hcd_end_port_resume() is called.
+ *
+ * The bus's private lock must be held by the caller.
+ */
+void usb_hcd_start_port_resume(struct usb_bus *bus, int portnum)
+{
+ unsigned bit = 1 << portnum;
+
+ if (!(bus->resuming_ports & bit)) {
+ bus->resuming_ports |= bit;
+ pm_runtime_get_noresume(&bus->root_hub->dev);
+ }
+}
+EXPORT_SYMBOL_GPL(usb_hcd_start_port_resume);
+
+/*
+ * usb_hcd_end_port_resume - a root-hub port has stopped sending a resume signal
+ * @bus: the bus which the root hub belongs to
+ * @portnum: the port which is being resumed
+ *
+ * HCDs should call this function when they know that a resume signal has
+ * stopped being sent to a root-hub port. The root hub will be allowed to
+ * autosuspend again.
+ *
+ * The bus's private lock must be held by the caller.
+ */
+void usb_hcd_end_port_resume(struct usb_bus *bus, int portnum)
+{
+ unsigned bit = 1 << portnum;
+
+ if (bus->resuming_ports & bit) {
+ bus->resuming_ports &= ~bit;
+ pm_runtime_put_noidle(&bus->root_hub->dev);
+ }
+}
+EXPORT_SYMBOL_GPL(usb_hcd_end_port_resume);
+
+/*-------------------------------------------------------------------------*/
+
+/**
+ * usb_calc_bus_time - approximate periodic transaction time in nanoseconds
+ * @speed: from dev->speed; USB_SPEED_{LOW,FULL,HIGH}
+ * @is_input: true iff the transaction sends data to the host
+ * @isoc: true for isochronous transactions, false for interrupt ones
+ * @bytecount: how many bytes in the transaction.
+ *
+ * Return: Approximate bus time in nanoseconds for a periodic transaction.
+ *
+ * Note:
+ * See USB 2.0 spec section 5.11.3; only periodic transfers need to be
+ * scheduled in software, this function is only used for such scheduling.
+ */
+long usb_calc_bus_time (int speed, int is_input, int isoc, int bytecount)
+{
+ unsigned long tmp;
+
+ switch (speed) {
+ case USB_SPEED_LOW: /* INTR only */
+ if (is_input) {
+ tmp = (67667L * (31L + 10L * BitTime (bytecount))) / 1000L;
+ return 64060L + (2 * BW_HUB_LS_SETUP) + BW_HOST_DELAY + tmp;
+ } else {
+ tmp = (66700L * (31L + 10L * BitTime (bytecount))) / 1000L;
+ return 64107L + (2 * BW_HUB_LS_SETUP) + BW_HOST_DELAY + tmp;
+ }
+ case USB_SPEED_FULL: /* ISOC or INTR */
+ if (isoc) {
+ tmp = (8354L * (31L + 10L * BitTime (bytecount))) / 1000L;
+ return ((is_input) ? 7268L : 6265L) + BW_HOST_DELAY + tmp;
+ } else {
+ tmp = (8354L * (31L + 10L * BitTime (bytecount))) / 1000L;
+ return 9107L + BW_HOST_DELAY + tmp;
+ }
+ case USB_SPEED_HIGH: /* ISOC or INTR */
+ /* FIXME adjust for input vs output */
+ if (isoc)
+ tmp = HS_NSECS_ISO (bytecount);
+ else
+ tmp = HS_NSECS (bytecount);
+ return tmp;
+ default:
+ pr_debug ("%s: bogus device speed!\n", usbcore_name);
+ return -1;
+ }
+}
+EXPORT_SYMBOL_GPL(usb_calc_bus_time);
+
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * Generic HC operations.
+ */
+
+/*-------------------------------------------------------------------------*/
+
+/**
+ * usb_hcd_link_urb_to_ep - add an URB to its endpoint queue
+ * @hcd: host controller to which @urb was submitted
+ * @urb: URB being submitted
+ *
+ * Host controller drivers should call this routine in their enqueue()
+ * method. The HCD's private spinlock must be held and interrupts must
+ * be disabled. The actions carried out here are required for URB
+ * submission, as well as for endpoint shutdown and for usb_kill_urb.
+ *
+ * Return: 0 for no error, otherwise a negative error code (in which case
+ * the enqueue() method must fail). If no error occurs but enqueue() fails
+ * anyway, it must call usb_hcd_unlink_urb_from_ep() before releasing
+ * the private spinlock and returning.
+ */
+int usb_hcd_link_urb_to_ep(struct usb_hcd *hcd, struct urb *urb)
+{
+ int rc = 0;
+
+ spin_lock(&hcd_urb_list_lock);
+
+ /* Check that the URB isn't being killed */
+ if (unlikely(atomic_read(&urb->reject))) {
+ rc = -EPERM;
+ goto done;
+ }
+
+ if (unlikely(!urb->ep->enabled)) {
+ rc = -ENOENT;
+ goto done;
+ }
+
+ if (unlikely(!urb->dev->can_submit)) {
+ rc = -EHOSTUNREACH;
+ goto done;
+ }
+
+ /*
+ * Check the host controller's state and add the URB to the
+ * endpoint's queue.
+ */
+ if (HCD_RH_RUNNING(hcd)) {
+ urb->unlinked = 0;
+ list_add_tail(&urb->urb_list, &urb->ep->urb_list);
+ } else {
+ rc = -ESHUTDOWN;
+ goto done;
+ }
+ done:
+ spin_unlock(&hcd_urb_list_lock);
+ return rc;
+}
+EXPORT_SYMBOL_GPL(usb_hcd_link_urb_to_ep);
+
+/**
+ * usb_hcd_check_unlink_urb - check whether an URB may be unlinked
+ * @hcd: host controller to which @urb was submitted
+ * @urb: URB being checked for unlinkability
+ * @status: error code to store in @urb if the unlink succeeds
+ *
+ * Host controller drivers should call this routine in their dequeue()
+ * method. The HCD's private spinlock must be held and interrupts must
+ * be disabled. The actions carried out here are required for making
+ * sure than an unlink is valid.
+ *
+ * Return: 0 for no error, otherwise a negative error code (in which case
+ * the dequeue() method must fail). The possible error codes are:
+ *
+ * -EIDRM: @urb was not submitted or has already completed.
+ * The completion function may not have been called yet.
+ *
+ * -EBUSY: @urb has already been unlinked.
+ */
+int usb_hcd_check_unlink_urb(struct usb_hcd *hcd, struct urb *urb,
+ int status)
+{
+ struct list_head *tmp;
+
+ /* insist the urb is still queued */
+ list_for_each(tmp, &urb->ep->urb_list) {
+ if (tmp == &urb->urb_list)
+ break;
+ }
+ if (tmp != &urb->urb_list)
+ return -EIDRM;
+
+ /* Any status except -EINPROGRESS means something already started to
+ * unlink this URB from the hardware. So there's no more work to do.
+ */
+ if (urb->unlinked)
+ return -EBUSY;
+ urb->unlinked = status;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(usb_hcd_check_unlink_urb);
+
+/**
+ * usb_hcd_unlink_urb_from_ep - remove an URB from its endpoint queue
+ * @hcd: host controller to which @urb was submitted
+ * @urb: URB being unlinked
+ *
+ * Host controller drivers should call this routine before calling
+ * usb_hcd_giveback_urb(). The HCD's private spinlock must be held and
+ * interrupts must be disabled. The actions carried out here are required
+ * for URB completion.
+ */
+void usb_hcd_unlink_urb_from_ep(struct usb_hcd *hcd, struct urb *urb)
+{
+ /* clear all state linking urb to this dev (and hcd) */
+ spin_lock(&hcd_urb_list_lock);
+ list_del_init(&urb->urb_list);
+ spin_unlock(&hcd_urb_list_lock);
+}
+EXPORT_SYMBOL_GPL(usb_hcd_unlink_urb_from_ep);
+
+/*
+ * Some usb host controllers can only perform dma using a small SRAM area.
+ * The usb core itself is however optimized for host controllers that can dma
+ * using regular system memory - like pci devices doing bus mastering.
+ *
+ * To support host controllers with limited dma capabilities we provide dma
+ * bounce buffers. This feature can be enabled using the HCD_LOCAL_MEM flag.
+ * For this to work properly the host controller code must first use the
+ * function dma_declare_coherent_memory() to point out which memory area
+ * that should be used for dma allocations.
+ *
+ * The HCD_LOCAL_MEM flag then tells the usb code to allocate all data for
+ * dma using dma_alloc_coherent() which in turn allocates from the memory
+ * area pointed out with dma_declare_coherent_memory().
+ *
+ * So, to summarize...
+ *
+ * - We need "local" memory, canonical example being
+ * a small SRAM on a discrete controller being the
+ * only memory that the controller can read ...
+ * (a) "normal" kernel memory is no good, and
+ * (b) there's not enough to share
+ *
+ * - The only *portable* hook for such stuff in the
+ * DMA framework is dma_declare_coherent_memory()
+ *
+ * - So we use that, even though the primary requirement
+ * is that the memory be "local" (hence addressable
+ * by that device), not "coherent".
+ *
+ */
+
+static int hcd_alloc_coherent(struct usb_bus *bus,
+ gfp_t mem_flags, dma_addr_t *dma_handle,
+ void **vaddr_handle, size_t size,
+ enum dma_data_direction dir)
+{
+ unsigned char *vaddr;
+
+ if (*vaddr_handle == NULL) {
+ WARN_ON_ONCE(1);
+ return -EFAULT;
+ }
+
+ vaddr = hcd_buffer_alloc(bus, size + sizeof(vaddr),
+ mem_flags, dma_handle);
+ if (!vaddr)
+ return -ENOMEM;
+
+ /*
+ * Store the virtual address of the buffer at the end
+ * of the allocated dma buffer. The size of the buffer
+ * may be uneven so use unaligned functions instead
+ * of just rounding up. It makes sense to optimize for
+ * memory footprint over access speed since the amount
+ * of memory available for dma may be limited.
+ */
+ put_unaligned((unsigned long)*vaddr_handle,
+ (unsigned long *)(vaddr + size));
+
+ if (dir == DMA_TO_DEVICE)
+ memcpy(vaddr, *vaddr_handle, size);
+
+ *vaddr_handle = vaddr;
+ return 0;
+}
+
+static void hcd_free_coherent(struct usb_bus *bus, dma_addr_t *dma_handle,
+ void **vaddr_handle, size_t size,
+ enum dma_data_direction dir)
+{
+ unsigned char *vaddr = *vaddr_handle;
+
+ vaddr = (void *)get_unaligned((unsigned long *)(vaddr + size));
+
+ if (dir == DMA_FROM_DEVICE)
+ memcpy(vaddr, *vaddr_handle, size);
+
+ hcd_buffer_free(bus, size + sizeof(vaddr), *vaddr_handle, *dma_handle);
+
+ *vaddr_handle = vaddr;
+ *dma_handle = 0;
+}
+
+void usb_hcd_unmap_urb_setup_for_dma(struct usb_hcd *hcd, struct urb *urb)
+{
+ if (urb->transfer_flags & URB_SETUP_MAP_SINGLE)
+ dma_unmap_single(hcd->self.controller,
+ urb->setup_dma,
+ sizeof(struct usb_ctrlrequest),
+ DMA_TO_DEVICE);
+ else if (urb->transfer_flags & URB_SETUP_MAP_LOCAL)
+ hcd_free_coherent(urb->dev->bus,
+ &urb->setup_dma,
+ (void **) &urb->setup_packet,
+ sizeof(struct usb_ctrlrequest),
+ DMA_TO_DEVICE);
+
+ /* Make it safe to call this routine more than once */
+ urb->transfer_flags &= ~(URB_SETUP_MAP_SINGLE | URB_SETUP_MAP_LOCAL);
+}
+EXPORT_SYMBOL_GPL(usb_hcd_unmap_urb_setup_for_dma);
+
+static void unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
+{
+ if (hcd->driver->unmap_urb_for_dma)
+ hcd->driver->unmap_urb_for_dma(hcd, urb);
+ else
+ usb_hcd_unmap_urb_for_dma(hcd, urb);
+}
+
+void usb_hcd_unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
+{
+ enum dma_data_direction dir;
+
+ usb_hcd_unmap_urb_setup_for_dma(hcd, urb);
+
+ dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
+ if (urb->transfer_flags & URB_DMA_MAP_SG)
+ dma_unmap_sg(hcd->self.controller,
+ urb->sg,
+ urb->num_sgs,
+ dir);
+ else if (urb->transfer_flags & URB_DMA_MAP_PAGE)
+ dma_unmap_page(hcd->self.controller,
+ urb->transfer_dma,
+ urb->transfer_buffer_length,
+ dir);
+ else if (urb->transfer_flags & URB_DMA_MAP_SINGLE)
+ dma_unmap_single(hcd->self.controller,
+ urb->transfer_dma,
+ urb->transfer_buffer_length,
+ dir);
+ else if (urb->transfer_flags & URB_MAP_LOCAL)
+ hcd_free_coherent(urb->dev->bus,
+ &urb->transfer_dma,
+ &urb->transfer_buffer,
+ urb->transfer_buffer_length,
+ dir);
+
+ /* Make it safe to call this routine more than once */
+ urb->transfer_flags &= ~(URB_DMA_MAP_SG | URB_DMA_MAP_PAGE |
+ URB_DMA_MAP_SINGLE | URB_MAP_LOCAL);
+}
+EXPORT_SYMBOL_GPL(usb_hcd_unmap_urb_for_dma);
+
+static int map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
+ gfp_t mem_flags)
+{
+ if (hcd->driver->map_urb_for_dma)
+ return hcd->driver->map_urb_for_dma(hcd, urb, mem_flags);
+ else
+ return usb_hcd_map_urb_for_dma(hcd, urb, mem_flags);
+}
+
+int usb_hcd_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
+ gfp_t mem_flags)
+{
+ enum dma_data_direction dir;
+ int ret = 0;
+
+ /* Map the URB's buffers for DMA access.
+ * Lower level HCD code should use *_dma exclusively,
+ * unless it uses pio or talks to another transport,
+ * or uses the provided scatter gather list for bulk.
+ */
+
+ if (usb_endpoint_xfer_control(&urb->ep->desc)) {
+ if (hcd->self.uses_pio_for_control)
+ return ret;
+ if (hcd->self.uses_dma) {
+ urb->setup_dma = dma_map_single(
+ hcd->self.controller,
+ urb->setup_packet,
+ sizeof(struct usb_ctrlrequest),
+ DMA_TO_DEVICE);
+ if (dma_mapping_error(hcd->self.controller,
+ urb->setup_dma))
+ return -EAGAIN;
+ urb->transfer_flags |= URB_SETUP_MAP_SINGLE;
+ } else if (hcd->driver->flags & HCD_LOCAL_MEM) {
+ ret = hcd_alloc_coherent(
+ urb->dev->bus, mem_flags,
+ &urb->setup_dma,
+ (void **)&urb->setup_packet,
+ sizeof(struct usb_ctrlrequest),
+ DMA_TO_DEVICE);
+ if (ret)
+ return ret;
+ urb->transfer_flags |= URB_SETUP_MAP_LOCAL;
+ }
+ }
+
+ dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
+ if (urb->transfer_buffer_length != 0
+ && !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP)) {
+ if (hcd->self.uses_dma) {
+ if (urb->num_sgs) {
+ int n;
+
+ /* We don't support sg for isoc transfers ! */
+ if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
+ WARN_ON(1);
+ return -EINVAL;
+ }
+
+ n = dma_map_sg(
+ hcd->self.controller,
+ urb->sg,
+ urb->num_sgs,
+ dir);
+ if (n <= 0)
+ ret = -EAGAIN;
+ else
+ urb->transfer_flags |= URB_DMA_MAP_SG;
+ urb->num_mapped_sgs = n;
+ if (n != urb->num_sgs)
+ urb->transfer_flags |=
+ URB_DMA_SG_COMBINED;
+ } else if (urb->sg) {
+ struct scatterlist *sg = urb->sg;
+ urb->transfer_dma = dma_map_page(
+ hcd->self.controller,
+ sg_page(sg),
+ sg->offset,
+ urb->transfer_buffer_length,
+ dir);
+ if (dma_mapping_error(hcd->self.controller,
+ urb->transfer_dma))
+ ret = -EAGAIN;
+ else
+ urb->transfer_flags |= URB_DMA_MAP_PAGE;
+ } else if (is_vmalloc_addr(urb->transfer_buffer)) {
+ WARN_ONCE(1, "transfer buffer not dma capable\n");
+ ret = -EAGAIN;
+ } else {
+ urb->transfer_dma = dma_map_single(
+ hcd->self.controller,
+ urb->transfer_buffer,
+ urb->transfer_buffer_length,
+ dir);
+ if (dma_mapping_error(hcd->self.controller,
+ urb->transfer_dma))
+ ret = -EAGAIN;
+ else
+ urb->transfer_flags |= URB_DMA_MAP_SINGLE;
+ }
+ } else if (hcd->driver->flags & HCD_LOCAL_MEM) {
+ ret = hcd_alloc_coherent(
+ urb->dev->bus, mem_flags,
+ &urb->transfer_dma,
+ &urb->transfer_buffer,
+ urb->transfer_buffer_length,
+ dir);
+ if (ret == 0)
+ urb->transfer_flags |= URB_MAP_LOCAL;
+ }
+ if (ret && (urb->transfer_flags & (URB_SETUP_MAP_SINGLE |
+ URB_SETUP_MAP_LOCAL)))
+ usb_hcd_unmap_urb_for_dma(hcd, urb);
+ }
+ return ret;
+}
+EXPORT_SYMBOL_GPL(usb_hcd_map_urb_for_dma);
+
+/*-------------------------------------------------------------------------*/
+
+/* may be called in any context with a valid urb->dev usecount
+ * caller surrenders "ownership" of urb
+ * expects usb_submit_urb() to have sanity checked and conditioned all
+ * inputs in the urb
+ */
+int usb_hcd_submit_urb (struct urb *urb, gfp_t mem_flags)
+{
+ int status;
+ struct usb_hcd *hcd = bus_to_hcd(urb->dev->bus);
+
+ /* increment urb's reference count as part of giving it to the HCD
+ * (which will control it). HCD guarantees that it either returns
+ * an error or calls giveback(), but not both.
+ */
+ usb_get_urb(urb);
+ atomic_inc(&urb->use_count);
+ atomic_inc(&urb->dev->urbnum);
+ usbmon_urb_submit(&hcd->self, urb);
+
+ /* NOTE requirements on root-hub callers (usbfs and the hub
+ * driver, for now): URBs' urb->transfer_buffer must be
+ * valid and usb_buffer_{sync,unmap}() not be needed, since
+ * they could clobber root hub response data. Also, control
+ * URBs must be submitted in process context with interrupts
+ * enabled.
+ */
+
+ if (is_root_hub(urb->dev)) {
+ status = rh_urb_enqueue(hcd, urb);
+ } else {
+ status = map_urb_for_dma(hcd, urb, mem_flags);
+ if (likely(status == 0)) {
+ status = hcd->driver->urb_enqueue(hcd, urb, mem_flags);
+ if (unlikely(status))
+ unmap_urb_for_dma(hcd, urb);
+ }
+ }
+
+ if (unlikely(status)) {
+ usbmon_urb_submit_error(&hcd->self, urb, status);
+ urb->hcpriv = NULL;
+ INIT_LIST_HEAD(&urb->urb_list);
+ atomic_dec(&urb->use_count);
+ atomic_dec(&urb->dev->urbnum);
+ if (atomic_read(&urb->reject))
+ wake_up(&usb_kill_urb_queue);
+ usb_put_urb(urb);
+ }
+ return status;
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* this makes the hcd giveback() the urb more quickly, by kicking it
+ * off hardware queues (which may take a while) and returning it as
+ * soon as practical. we've already set up the urb's return status,
+ * but we can't know if the callback completed already.
+ */
+static int unlink1(struct usb_hcd *hcd, struct urb *urb, int status)
+{
+ int value;
+
+ if (is_root_hub(urb->dev))
+ value = usb_rh_urb_dequeue(hcd, urb, status);
+ else {
+
+ /* The only reason an HCD might fail this call is if
+ * it has not yet fully queued the urb to begin with.
+ * Such failures should be harmless. */
+ value = hcd->driver->urb_dequeue(hcd, urb, status);
+ }
+ return value;
+}
+
+/*
+ * called in any context
+ *
+ * caller guarantees urb won't be recycled till both unlink()
+ * and the urb's completion function return
+ */
+int usb_hcd_unlink_urb (struct urb *urb, int status)
+{
+ struct usb_hcd *hcd;
+ struct usb_device *udev = urb->dev;
+ int retval = -EIDRM;
+ unsigned long flags;
+
+ /* Prevent the device and bus from going away while
+ * the unlink is carried out. If they are already gone
+ * then urb->use_count must be 0, since disconnected
+ * devices can't have any active URBs.
+ */
+ spin_lock_irqsave(&hcd_urb_unlink_lock, flags);
+ if (atomic_read(&urb->use_count) > 0) {
+ retval = 0;
+ usb_get_dev(udev);
+ }
+ spin_unlock_irqrestore(&hcd_urb_unlink_lock, flags);
+ if (retval == 0) {
+ hcd = bus_to_hcd(urb->dev->bus);
+ retval = unlink1(hcd, urb, status);
+ if (retval == 0)
+ retval = -EINPROGRESS;
+ else if (retval != -EIDRM && retval != -EBUSY)
+ dev_dbg(&udev->dev, "hcd_unlink_urb %p fail %d\n",
+ urb, retval);
+ usb_put_dev(udev);
+ }
+ return retval;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static void __usb_hcd_giveback_urb(struct urb *urb)
+{
+ struct usb_hcd *hcd = bus_to_hcd(urb->dev->bus);
+ struct usb_anchor *anchor = urb->anchor;
+ int status = urb->unlinked;
+ unsigned long flags;
+
+ urb->hcpriv = NULL;
+ if (unlikely((urb->transfer_flags & URB_SHORT_NOT_OK) &&
+ urb->actual_length < urb->transfer_buffer_length &&
+ !status))
+ status = -EREMOTEIO;
+
+ unmap_urb_for_dma(hcd, urb);
+ usbmon_urb_complete(&hcd->self, urb, status);
+ usb_anchor_suspend_wakeups(anchor);
+ usb_unanchor_urb(urb);
+ if (likely(status == 0))
+ usb_led_activity(USB_LED_EVENT_HOST);
+
+ /* pass ownership to the completion handler */
+ urb->status = status;
+
+ /*
+ * We disable local IRQs here avoid possible deadlock because
+ * drivers may call spin_lock() to hold lock which might be
+ * acquired in one hard interrupt handler.
+ *
+ * The local_irq_save()/local_irq_restore() around complete()
+ * will be removed if current USB drivers have been cleaned up
+ * and no one may trigger the above deadlock situation when
+ * running complete() in tasklet.
+ */
+ local_irq_save_nort(flags);
+ urb->complete(urb);
+ local_irq_restore_nort(flags);
+
+ usb_anchor_resume_wakeups(anchor);
+ atomic_dec(&urb->use_count);
+ if (unlikely(atomic_read(&urb->reject)))
+ wake_up(&usb_kill_urb_queue);
+ usb_put_urb(urb);
+}
+
+static void usb_giveback_urb_bh(unsigned long param)
+{
+ struct giveback_urb_bh *bh = (struct giveback_urb_bh *)param;
+ struct list_head local_list;
+
+ spin_lock_irq(&bh->lock);
+ bh->running = true;
+ restart:
+ list_replace_init(&bh->head, &local_list);
+ spin_unlock_irq(&bh->lock);
+
+ while (!list_empty(&local_list)) {
+ struct urb *urb;
+
+ urb = list_entry(local_list.next, struct urb, urb_list);
+ list_del_init(&urb->urb_list);
+ bh->completing_ep = urb->ep;
+ __usb_hcd_giveback_urb(urb);
+ bh->completing_ep = NULL;
+ }
+
+ /* check if there are new URBs to giveback */
+ spin_lock_irq(&bh->lock);
+ if (!list_empty(&bh->head))
+ goto restart;
+ bh->running = false;
+ spin_unlock_irq(&bh->lock);
+}
+
+/**
+ * usb_hcd_giveback_urb - return URB from HCD to device driver
+ * @hcd: host controller returning the URB
+ * @urb: urb being returned to the USB device driver.
+ * @status: completion status code for the URB.
+ * Context: in_interrupt()
+ *
+ * This hands the URB from HCD to its USB device driver, using its
+ * completion function. The HCD has freed all per-urb resources
+ * (and is done using urb->hcpriv). It also released all HCD locks;
+ * the device driver won't cause problems if it frees, modifies,
+ * or resubmits this URB.
+ *
+ * If @urb was unlinked, the value of @status will be overridden by
+ * @urb->unlinked. Erroneous short transfers are detected in case
+ * the HCD hasn't checked for them.
+ */
+void usb_hcd_giveback_urb(struct usb_hcd *hcd, struct urb *urb, int status)
+{
+ struct giveback_urb_bh *bh;
+ bool running, high_prio_bh;
+
+ /* pass status to tasklet via unlinked */
+ if (likely(!urb->unlinked))
+ urb->unlinked = status;
+
+ if (!hcd_giveback_urb_in_bh(hcd) && !is_root_hub(urb->dev)) {
+ __usb_hcd_giveback_urb(urb);
+ return;
+ }
+
+ if (usb_pipeisoc(urb->pipe) || usb_pipeint(urb->pipe)) {
+ bh = &hcd->high_prio_bh;
+ high_prio_bh = true;
+ } else {
+ bh = &hcd->low_prio_bh;
+ high_prio_bh = false;
+ }
+
+ spin_lock(&bh->lock);
+ list_add_tail(&urb->urb_list, &bh->head);
+ running = bh->running;
+ spin_unlock(&bh->lock);
+
+ if (running)
+ ;
+ else if (high_prio_bh)
+ tasklet_hi_schedule(&bh->bh);
+ else
+ tasklet_schedule(&bh->bh);
+}
+EXPORT_SYMBOL_GPL(usb_hcd_giveback_urb);
+
+/*-------------------------------------------------------------------------*/
+
+/* Cancel all URBs pending on this endpoint and wait for the endpoint's
+ * queue to drain completely. The caller must first insure that no more
+ * URBs can be submitted for this endpoint.
+ */
+void usb_hcd_flush_endpoint(struct usb_device *udev,
+ struct usb_host_endpoint *ep)
+{
+ struct usb_hcd *hcd;
+ struct urb *urb;
+
+ if (!ep)
+ return;
+ might_sleep();
+ hcd = bus_to_hcd(udev->bus);
+
+ /* No more submits can occur */
+ spin_lock_irq(&hcd_urb_list_lock);
+rescan:
+ list_for_each_entry (urb, &ep->urb_list, urb_list) {
+ int is_in;
+
+ if (urb->unlinked)
+ continue;
+ usb_get_urb (urb);
+ is_in = usb_urb_dir_in(urb);
+ spin_unlock(&hcd_urb_list_lock);
+
+ /* kick hcd */
+ unlink1(hcd, urb, -ESHUTDOWN);
+ dev_dbg (hcd->self.controller,
+ "shutdown urb %p ep%d%s%s\n",
+ urb, usb_endpoint_num(&ep->desc),
+ is_in ? "in" : "out",
+ ({ char *s;
+
+ switch (usb_endpoint_type(&ep->desc)) {
+ case USB_ENDPOINT_XFER_CONTROL:
+ s = ""; break;
+ case USB_ENDPOINT_XFER_BULK:
+ s = "-bulk"; break;
+ case USB_ENDPOINT_XFER_INT:
+ s = "-intr"; break;
+ default:
+ s = "-iso"; break;
+ };
+ s;
+ }));
+ usb_put_urb (urb);
+
+ /* list contents may have changed */
+ spin_lock(&hcd_urb_list_lock);
+ goto rescan;
+ }
+ spin_unlock_irq(&hcd_urb_list_lock);
+
+ /* Wait until the endpoint queue is completely empty */
+ while (!list_empty (&ep->urb_list)) {
+ spin_lock_irq(&hcd_urb_list_lock);
+
+ /* The list may have changed while we acquired the spinlock */
+ urb = NULL;
+ if (!list_empty (&ep->urb_list)) {
+ urb = list_entry (ep->urb_list.prev, struct urb,
+ urb_list);
+ usb_get_urb (urb);
+ }
+ spin_unlock_irq(&hcd_urb_list_lock);
+
+ if (urb) {
+ usb_kill_urb (urb);
+ usb_put_urb (urb);
+ }
+ }
+}
+
+/**
+ * usb_hcd_alloc_bandwidth - check whether a new bandwidth setting exceeds
+ * the bus bandwidth
+ * @udev: target &usb_device
+ * @new_config: new configuration to install
+ * @cur_alt: the current alternate interface setting
+ * @new_alt: alternate interface setting that is being installed
+ *
+ * To change configurations, pass in the new configuration in new_config,
+ * and pass NULL for cur_alt and new_alt.
+ *
+ * To reset a device's configuration (put the device in the ADDRESSED state),
+ * pass in NULL for new_config, cur_alt, and new_alt.
+ *
+ * To change alternate interface settings, pass in NULL for new_config,
+ * pass in the current alternate interface setting in cur_alt,
+ * and pass in the new alternate interface setting in new_alt.
+ *
+ * Return: An error if the requested bandwidth change exceeds the
+ * bus bandwidth or host controller internal resources.
+ */
+int usb_hcd_alloc_bandwidth(struct usb_device *udev,
+ struct usb_host_config *new_config,
+ struct usb_host_interface *cur_alt,
+ struct usb_host_interface *new_alt)
+{
+ int num_intfs, i, j;
+ struct usb_host_interface *alt = NULL;
+ int ret = 0;
+ struct usb_hcd *hcd;
+ struct usb_host_endpoint *ep;
+
+ hcd = bus_to_hcd(udev->bus);
+ if (!hcd->driver->check_bandwidth)
+ return 0;
+
+ /* Configuration is being removed - set configuration 0 */
+ if (!new_config && !cur_alt) {
+ for (i = 1; i < 16; ++i) {
+ ep = udev->ep_out[i];
+ if (ep)
+ hcd->driver->drop_endpoint(hcd, udev, ep);
+ ep = udev->ep_in[i];
+ if (ep)
+ hcd->driver->drop_endpoint(hcd, udev, ep);
+ }
+ hcd->driver->check_bandwidth(hcd, udev);
+ return 0;
+ }
+ /* Check if the HCD says there's enough bandwidth. Enable all endpoints
+ * each interface's alt setting 0 and ask the HCD to check the bandwidth
+ * of the bus. There will always be bandwidth for endpoint 0, so it's
+ * ok to exclude it.
+ */
+ if (new_config) {
+ num_intfs = new_config->desc.bNumInterfaces;
+ /* Remove endpoints (except endpoint 0, which is always on the
+ * schedule) from the old config from the schedule
+ */
+ for (i = 1; i < 16; ++i) {
+ ep = udev->ep_out[i];
+ if (ep) {
+ ret = hcd->driver->drop_endpoint(hcd, udev, ep);
+ if (ret < 0)
+ goto reset;
+ }
+ ep = udev->ep_in[i];
+ if (ep) {
+ ret = hcd->driver->drop_endpoint(hcd, udev, ep);
+ if (ret < 0)
+ goto reset;
+ }
+ }
+ for (i = 0; i < num_intfs; ++i) {
+ struct usb_host_interface *first_alt;
+ int iface_num;
+
+ first_alt = &new_config->intf_cache[i]->altsetting[0];
+ iface_num = first_alt->desc.bInterfaceNumber;
+ /* Set up endpoints for alternate interface setting 0 */
+ alt = usb_find_alt_setting(new_config, iface_num, 0);
+ if (!alt)
+ /* No alt setting 0? Pick the first setting. */
+ alt = first_alt;
+
+ for (j = 0; j < alt->desc.bNumEndpoints; j++) {
+ ret = hcd->driver->add_endpoint(hcd, udev, &alt->endpoint[j]);
+ if (ret < 0)
+ goto reset;
+ }
+ }
+ }
+ if (cur_alt && new_alt) {
+ struct usb_interface *iface = usb_ifnum_to_if(udev,
+ cur_alt->desc.bInterfaceNumber);
+
+ if (!iface)
+ return -EINVAL;
+ if (iface->resetting_device) {
+ /*
+ * The USB core just reset the device, so the xHCI host
+ * and the device will think alt setting 0 is installed.
+ * However, the USB core will pass in the alternate
+ * setting installed before the reset as cur_alt. Dig
+ * out the alternate setting 0 structure, or the first
+ * alternate setting if a broken device doesn't have alt
+ * setting 0.
+ */
+ cur_alt = usb_altnum_to_altsetting(iface, 0);
+ if (!cur_alt)
+ cur_alt = &iface->altsetting[0];
+ }
+
+ /* Drop all the endpoints in the current alt setting */
+ for (i = 0; i < cur_alt->desc.bNumEndpoints; i++) {
+ ret = hcd->driver->drop_endpoint(hcd, udev,
+ &cur_alt->endpoint[i]);
+ if (ret < 0)
+ goto reset;
+ }
+ /* Add all the endpoints in the new alt setting */
+ for (i = 0; i < new_alt->desc.bNumEndpoints; i++) {
+ ret = hcd->driver->add_endpoint(hcd, udev,
+ &new_alt->endpoint[i]);
+ if (ret < 0)
+ goto reset;
+ }
+ }
+ ret = hcd->driver->check_bandwidth(hcd, udev);
+reset:
+ if (ret < 0)
+ hcd->driver->reset_bandwidth(hcd, udev);
+ return ret;
+}
+
+/* Disables the endpoint: synchronizes with the hcd to make sure all
+ * endpoint state is gone from hardware. usb_hcd_flush_endpoint() must
+ * have been called previously. Use for set_configuration, set_interface,
+ * driver removal, physical disconnect.
+ *
+ * example: a qh stored in ep->hcpriv, holding state related to endpoint
+ * type, maxpacket size, toggle, halt status, and scheduling.
+ */
+void usb_hcd_disable_endpoint(struct usb_device *udev,
+ struct usb_host_endpoint *ep)
+{
+ struct usb_hcd *hcd;
+
+ might_sleep();
+ hcd = bus_to_hcd(udev->bus);
+ if (hcd->driver->endpoint_disable)
+ hcd->driver->endpoint_disable(hcd, ep);
+}
+
+/**
+ * usb_hcd_reset_endpoint - reset host endpoint state
+ * @udev: USB device.
+ * @ep: the endpoint to reset.
+ *
+ * Resets any host endpoint state such as the toggle bit, sequence
+ * number and current window.
+ */
+void usb_hcd_reset_endpoint(struct usb_device *udev,
+ struct usb_host_endpoint *ep)
+{
+ struct usb_hcd *hcd = bus_to_hcd(udev->bus);
+
+ if (hcd->driver->endpoint_reset)
+ hcd->driver->endpoint_reset(hcd, ep);
+ else {
+ int epnum = usb_endpoint_num(&ep->desc);
+ int is_out = usb_endpoint_dir_out(&ep->desc);
+ int is_control = usb_endpoint_xfer_control(&ep->desc);
+
+ usb_settoggle(udev, epnum, is_out, 0);
+ if (is_control)
+ usb_settoggle(udev, epnum, !is_out, 0);
+ }
+}
+
+/**
+ * usb_alloc_streams - allocate bulk endpoint stream IDs.
+ * @interface: alternate setting that includes all endpoints.
+ * @eps: array of endpoints that need streams.
+ * @num_eps: number of endpoints in the array.
+ * @num_streams: number of streams to allocate.
+ * @mem_flags: flags hcd should use to allocate memory.
+ *
+ * Sets up a group of bulk endpoints to have @num_streams stream IDs available.
+ * Drivers may queue multiple transfers to different stream IDs, which may
+ * complete in a different order than they were queued.
+ *
+ * Return: On success, the number of allocated streams. On failure, a negative
+ * error code.
+ */
+int usb_alloc_streams(struct usb_interface *interface,
+ struct usb_host_endpoint **eps, unsigned int num_eps,
+ unsigned int num_streams, gfp_t mem_flags)
+{
+ struct usb_hcd *hcd;
+ struct usb_device *dev;
+ int i, ret;
+
+ dev = interface_to_usbdev(interface);
+ hcd = bus_to_hcd(dev->bus);
+ if (!hcd->driver->alloc_streams || !hcd->driver->free_streams)
+ return -EINVAL;
+ if (dev->speed != USB_SPEED_SUPER)
+ return -EINVAL;
+ if (dev->state < USB_STATE_CONFIGURED)
+ return -ENODEV;
+
+ for (i = 0; i < num_eps; i++) {
+ /* Streams only apply to bulk endpoints. */
+ if (!usb_endpoint_xfer_bulk(&eps[i]->desc))
+ return -EINVAL;
+ /* Re-alloc is not allowed */
+ if (eps[i]->streams)
+ return -EINVAL;
+ }
+
+ ret = hcd->driver->alloc_streams(hcd, dev, eps, num_eps,
+ num_streams, mem_flags);
+ if (ret < 0)
+ return ret;
+
+ for (i = 0; i < num_eps; i++)
+ eps[i]->streams = ret;
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(usb_alloc_streams);
+
+/**
+ * usb_free_streams - free bulk endpoint stream IDs.
+ * @interface: alternate setting that includes all endpoints.
+ * @eps: array of endpoints to remove streams from.
+ * @num_eps: number of endpoints in the array.
+ * @mem_flags: flags hcd should use to allocate memory.
+ *
+ * Reverts a group of bulk endpoints back to not using stream IDs.
+ * Can fail if we are given bad arguments, or HCD is broken.
+ *
+ * Return: 0 on success. On failure, a negative error code.
+ */
+int usb_free_streams(struct usb_interface *interface,
+ struct usb_host_endpoint **eps, unsigned int num_eps,
+ gfp_t mem_flags)
+{
+ struct usb_hcd *hcd;
+ struct usb_device *dev;
+ int i, ret;
+
+ dev = interface_to_usbdev(interface);
+ hcd = bus_to_hcd(dev->bus);
+ if (dev->speed != USB_SPEED_SUPER)
+ return -EINVAL;
+
+ /* Double-free is not allowed */
+ for (i = 0; i < num_eps; i++)
+ if (!eps[i] || !eps[i]->streams)
+ return -EINVAL;
+
+ ret = hcd->driver->free_streams(hcd, dev, eps, num_eps, mem_flags);
+ if (ret < 0)
+ return ret;
+
+ for (i = 0; i < num_eps; i++)
+ eps[i]->streams = 0;
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(usb_free_streams);
+
+/* Protect against drivers that try to unlink URBs after the device
+ * is gone, by waiting until all unlinks for @udev are finished.
+ * Since we don't currently track URBs by device, simply wait until
+ * nothing is running in the locked region of usb_hcd_unlink_urb().
+ */
+void usb_hcd_synchronize_unlinks(struct usb_device *udev)
+{
+ spin_lock_irq(&hcd_urb_unlink_lock);
+ spin_unlock_irq(&hcd_urb_unlink_lock);
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* called in any context */
+int usb_hcd_get_frame_number (struct usb_device *udev)
+{
+ struct usb_hcd *hcd = bus_to_hcd(udev->bus);
+
+ if (!HCD_RH_RUNNING(hcd))
+ return -ESHUTDOWN;
+ return hcd->driver->get_frame_number (hcd);
+}
+
+/*-------------------------------------------------------------------------*/
+
+#ifdef CONFIG_PM
+
+int hcd_bus_suspend(struct usb_device *rhdev, pm_message_t msg)
+{
+ struct usb_hcd *hcd = container_of(rhdev->bus, struct usb_hcd, self);
+ int status;
+ int old_state = hcd->state;
+
+ dev_dbg(&rhdev->dev, "bus %ssuspend, wakeup %d\n",
+ (PMSG_IS_AUTO(msg) ? "auto-" : ""),
+ rhdev->do_remote_wakeup);
+ if (HCD_DEAD(hcd)) {
+ dev_dbg(&rhdev->dev, "skipped %s of dead bus\n", "suspend");
+ return 0;
+ }
+
+ if (!hcd->driver->bus_suspend) {
+ status = -ENOENT;
+ } else {
+ clear_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
+ hcd->state = HC_STATE_QUIESCING;
+ status = hcd->driver->bus_suspend(hcd);
+ }
+ if (status == 0) {
+ usb_set_device_state(rhdev, USB_STATE_SUSPENDED);
+ hcd->state = HC_STATE_SUSPENDED;
+
+ /* Did we race with a root-hub wakeup event? */
+ if (rhdev->do_remote_wakeup) {
+ char buffer[6];
+
+ status = hcd->driver->hub_status_data(hcd, buffer);
+ if (status != 0) {
+ dev_dbg(&rhdev->dev, "suspend raced with wakeup event\n");
+ hcd_bus_resume(rhdev, PMSG_AUTO_RESUME);
+ status = -EBUSY;
+ }
+ }
+ } else {
+ spin_lock_irq(&hcd_root_hub_lock);
+ if (!HCD_DEAD(hcd)) {
+ set_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
+ hcd->state = old_state;
+ }
+ spin_unlock_irq(&hcd_root_hub_lock);
+ dev_dbg(&rhdev->dev, "bus %s fail, err %d\n",
+ "suspend", status);
+ }
+ return status;
+}
+
+int hcd_bus_resume(struct usb_device *rhdev, pm_message_t msg)
+{
+ struct usb_hcd *hcd = container_of(rhdev->bus, struct usb_hcd, self);
+ int status;
+ int old_state = hcd->state;
+
+ dev_dbg(&rhdev->dev, "usb %sresume\n",
+ (PMSG_IS_AUTO(msg) ? "auto-" : ""));
+ if (HCD_DEAD(hcd)) {
+ dev_dbg(&rhdev->dev, "skipped %s of dead bus\n", "resume");
+ return 0;
+ }
+ if (!hcd->driver->bus_resume)
+ return -ENOENT;
+ if (HCD_RH_RUNNING(hcd))
+ return 0;
+
+ hcd->state = HC_STATE_RESUMING;
+ status = hcd->driver->bus_resume(hcd);
+ clear_bit(HCD_FLAG_WAKEUP_PENDING, &hcd->flags);
+ if (status == 0) {
+ struct usb_device *udev;
+ int port1;
+
+ spin_lock_irq(&hcd_root_hub_lock);
+ if (!HCD_DEAD(hcd)) {
+ usb_set_device_state(rhdev, rhdev->actconfig
+ ? USB_STATE_CONFIGURED
+ : USB_STATE_ADDRESS);
+ set_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
+ hcd->state = HC_STATE_RUNNING;
+ }
+ spin_unlock_irq(&hcd_root_hub_lock);
+
+ /*
+ * Check whether any of the enabled ports on the root hub are
+ * unsuspended. If they are then a TRSMRCY delay is needed
+ * (this is what the USB-2 spec calls a "global resume").
+ * Otherwise we can skip the delay.
+ */
+ usb_hub_for_each_child(rhdev, port1, udev) {
+ if (udev->state != USB_STATE_NOTATTACHED &&
+ !udev->port_is_suspended) {
+ usleep_range(10000, 11000); /* TRSMRCY */
+ break;
+ }
+ }
+ } else {
+ hcd->state = old_state;
+ dev_dbg(&rhdev->dev, "bus %s fail, err %d\n",
+ "resume", status);
+ if (status != -ESHUTDOWN)
+ usb_hc_died(hcd);
+ }
+ return status;
+}
+
+/* Workqueue routine for root-hub remote wakeup */
+static void hcd_resume_work(struct work_struct *work)
+{
+ struct usb_hcd *hcd = container_of(work, struct usb_hcd, wakeup_work);
+ struct usb_device *udev = hcd->self.root_hub;
+
+ usb_remote_wakeup(udev);
+}
+
+/**
+ * usb_hcd_resume_root_hub - called by HCD to resume its root hub
+ * @hcd: host controller for this root hub
+ *
+ * The USB host controller calls this function when its root hub is
+ * suspended (with the remote wakeup feature enabled) and a remote
+ * wakeup request is received. The routine submits a workqueue request
+ * to resume the root hub (that is, manage its downstream ports again).
+ */
+void usb_hcd_resume_root_hub (struct usb_hcd *hcd)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave (&hcd_root_hub_lock, flags);
+ if (hcd->rh_registered) {
+ set_bit(HCD_FLAG_WAKEUP_PENDING, &hcd->flags);
+ queue_work(pm_wq, &hcd->wakeup_work);
+ }
+ spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
+}
+EXPORT_SYMBOL_GPL(usb_hcd_resume_root_hub);
+
+#endif /* CONFIG_PM */
+
+/*-------------------------------------------------------------------------*/
+
+#ifdef CONFIG_USB_OTG
+
+/**
+ * usb_bus_start_enum - start immediate enumeration (for OTG)
+ * @bus: the bus (must use hcd framework)
+ * @port_num: 1-based number of port; usually bus->otg_port
+ * Context: in_interrupt()
+ *
+ * Starts enumeration, with an immediate reset followed later by
+ * hub_wq identifying and possibly configuring the device.
+ * This is needed by OTG controller drivers, where it helps meet
+ * HNP protocol timing requirements for starting a port reset.
+ *
+ * Return: 0 if successful.
+ */
+int usb_bus_start_enum(struct usb_bus *bus, unsigned port_num)
+{
+ struct usb_hcd *hcd;
+ int status = -EOPNOTSUPP;
+
+ /* NOTE: since HNP can't start by grabbing the bus's address0_sem,
+ * boards with root hubs hooked up to internal devices (instead of
+ * just the OTG port) may need more attention to resetting...
+ */
+ hcd = container_of (bus, struct usb_hcd, self);
+ if (port_num && hcd->driver->start_port_reset)
+ status = hcd->driver->start_port_reset(hcd, port_num);
+
+ /* allocate hub_wq shortly after (first) root port reset finishes;
+ * it may issue others, until at least 50 msecs have passed.
+ */
+ if (status == 0)
+ mod_timer(&hcd->rh_timer, jiffies + msecs_to_jiffies(10));
+ return status;
+}
+EXPORT_SYMBOL_GPL(usb_bus_start_enum);
+
+#endif
+
+/*-------------------------------------------------------------------------*/
+
+/**
+ * usb_hcd_irq - hook IRQs to HCD framework (bus glue)
+ * @irq: the IRQ being raised
+ * @__hcd: pointer to the HCD whose IRQ is being signaled
+ *
+ * If the controller isn't HALTed, calls the driver's irq handler.
+ * Checks whether the controller is now dead.
+ *
+ * Return: %IRQ_HANDLED if the IRQ was handled. %IRQ_NONE otherwise.
+ */
+irqreturn_t usb_hcd_irq (int irq, void *__hcd)
+{
+ struct usb_hcd *hcd = __hcd;
+ irqreturn_t rc;
+
+ if (unlikely(HCD_DEAD(hcd) || !HCD_HW_ACCESSIBLE(hcd)))
+ rc = IRQ_NONE;
+ else if (hcd->driver->irq(hcd) == IRQ_NONE)
+ rc = IRQ_NONE;
+ else
+ rc = IRQ_HANDLED;
+
+ return rc;
+}
+EXPORT_SYMBOL_GPL(usb_hcd_irq);
+
+/*-------------------------------------------------------------------------*/
+
+/**
+ * usb_hc_died - report abnormal shutdown of a host controller (bus glue)
+ * @hcd: pointer to the HCD representing the controller
+ *
+ * This is called by bus glue to report a USB host controller that died
+ * while operations may still have been pending. It's called automatically
+ * by the PCI glue, so only glue for non-PCI busses should need to call it.
+ *
+ * Only call this function with the primary HCD.
+ */
+void usb_hc_died (struct usb_hcd *hcd)
+{
+ unsigned long flags;
+
+ dev_err (hcd->self.controller, "HC died; cleaning up\n");
+
+ spin_lock_irqsave (&hcd_root_hub_lock, flags);
+ clear_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
+ set_bit(HCD_FLAG_DEAD, &hcd->flags);
+ if (hcd->rh_registered) {
+ clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
+
+ /* make hub_wq clean up old urbs and devices */
+ usb_set_device_state (hcd->self.root_hub,
+ USB_STATE_NOTATTACHED);
+ usb_kick_hub_wq(hcd->self.root_hub);
+ }
+ if (usb_hcd_is_primary_hcd(hcd) && hcd->shared_hcd) {
+ hcd = hcd->shared_hcd;
+ if (hcd->rh_registered) {
+ clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
+
+ /* make hub_wq clean up old urbs and devices */
+ usb_set_device_state(hcd->self.root_hub,
+ USB_STATE_NOTATTACHED);
+ usb_kick_hub_wq(hcd->self.root_hub);
+ }
+ }
+ spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
+ /* Make sure that the other roothub is also deallocated. */
+}
+EXPORT_SYMBOL_GPL (usb_hc_died);
+
+/*-------------------------------------------------------------------------*/
+
+static void init_giveback_urb_bh(struct giveback_urb_bh *bh)
+{
+
+ spin_lock_init(&bh->lock);
+ INIT_LIST_HEAD(&bh->head);
+ tasklet_init(&bh->bh, usb_giveback_urb_bh, (unsigned long)bh);
+}
+
+/**
+ * usb_create_shared_hcd - create and initialize an HCD structure
+ * @driver: HC driver that will use this hcd
+ * @dev: device for this HC, stored in hcd->self.controller
+ * @bus_name: value to store in hcd->self.bus_name
+ * @primary_hcd: a pointer to the usb_hcd structure that is sharing the
+ * PCI device. Only allocate certain resources for the primary HCD
+ * Context: !in_interrupt()
+ *
+ * Allocate a struct usb_hcd, with extra space at the end for the
+ * HC driver's private data. Initialize the generic members of the
+ * hcd structure.
+ *
+ * Return: On success, a pointer to the created and initialized HCD structure.
+ * On failure (e.g. if memory is unavailable), %NULL.
+ */
+struct usb_hcd *usb_create_shared_hcd(const struct hc_driver *driver,
+ struct device *dev, const char *bus_name,
+ struct usb_hcd *primary_hcd)
+{
+ struct usb_hcd *hcd;
+
+ hcd = kzalloc(sizeof(*hcd) + driver->hcd_priv_size, GFP_KERNEL);
+ if (!hcd) {
+ dev_dbg (dev, "hcd alloc failed\n");
+ return NULL;
+ }
+ if (primary_hcd == NULL) {
+ hcd->bandwidth_mutex = kmalloc(sizeof(*hcd->bandwidth_mutex),
+ GFP_KERNEL);
+ if (!hcd->bandwidth_mutex) {
+ kfree(hcd);
+ dev_dbg(dev, "hcd bandwidth mutex alloc failed\n");
+ return NULL;
+ }
+ mutex_init(hcd->bandwidth_mutex);
+ dev_set_drvdata(dev, hcd);
+ } else {
+ mutex_lock(&usb_port_peer_mutex);
+ hcd->bandwidth_mutex = primary_hcd->bandwidth_mutex;
+ hcd->primary_hcd = primary_hcd;
+ primary_hcd->primary_hcd = primary_hcd;
+ hcd->shared_hcd = primary_hcd;
+ primary_hcd->shared_hcd = hcd;
+ mutex_unlock(&usb_port_peer_mutex);
+ }
+
+ kref_init(&hcd->kref);
+
+ usb_bus_init(&hcd->self);
+ hcd->self.controller = dev;
+ hcd->self.bus_name = bus_name;
+ hcd->self.uses_dma = (dev->dma_mask != NULL);
+
+ init_timer(&hcd->rh_timer);
+ hcd->rh_timer.function = rh_timer_func;
+ hcd->rh_timer.data = (unsigned long) hcd;
+#ifdef CONFIG_PM
+ INIT_WORK(&hcd->wakeup_work, hcd_resume_work);
+#endif
+
+ hcd->driver = driver;
+ hcd->speed = driver->flags & HCD_MASK;
+ hcd->product_desc = (driver->product_desc) ? driver->product_desc :
+ "USB Host Controller";
+ return hcd;
+}
+EXPORT_SYMBOL_GPL(usb_create_shared_hcd);
+
+/**
+ * usb_create_hcd - create and initialize an HCD structure
+ * @driver: HC driver that will use this hcd
+ * @dev: device for this HC, stored in hcd->self.controller
+ * @bus_name: value to store in hcd->self.bus_name
+ * Context: !in_interrupt()
+ *
+ * Allocate a struct usb_hcd, with extra space at the end for the
+ * HC driver's private data. Initialize the generic members of the
+ * hcd structure.
+ *
+ * Return: On success, a pointer to the created and initialized HCD
+ * structure. On failure (e.g. if memory is unavailable), %NULL.
+ */
+struct usb_hcd *usb_create_hcd(const struct hc_driver *driver,
+ struct device *dev, const char *bus_name)
+{
+ return usb_create_shared_hcd(driver, dev, bus_name, NULL);
+}
+EXPORT_SYMBOL_GPL(usb_create_hcd);
+
+/*
+ * Roothubs that share one PCI device must also share the bandwidth mutex.
+ * Don't deallocate the bandwidth_mutex until the last shared usb_hcd is
+ * deallocated.
+ *
+ * Make sure to only deallocate the bandwidth_mutex when the primary HCD is
+ * freed. When hcd_release() is called for either hcd in a peer set
+ * invalidate the peer's ->shared_hcd and ->primary_hcd pointers to
+ * block new peering attempts
+ */
+static void hcd_release(struct kref *kref)
+{
+ struct usb_hcd *hcd = container_of (kref, struct usb_hcd, kref);
+
+ mutex_lock(&usb_port_peer_mutex);
+ if (usb_hcd_is_primary_hcd(hcd))
+ kfree(hcd->bandwidth_mutex);
+ if (hcd->shared_hcd) {
+ struct usb_hcd *peer = hcd->shared_hcd;
+
+ peer->shared_hcd = NULL;
+ if (peer->primary_hcd == hcd)
+ peer->primary_hcd = NULL;
+ }
+ mutex_unlock(&usb_port_peer_mutex);
+ kfree(hcd);
+}
+
+struct usb_hcd *usb_get_hcd (struct usb_hcd *hcd)
+{
+ if (hcd)
+ kref_get (&hcd->kref);
+ return hcd;
+}
+EXPORT_SYMBOL_GPL(usb_get_hcd);
+
+void usb_put_hcd (struct usb_hcd *hcd)
+{
+ if (hcd)
+ kref_put (&hcd->kref, hcd_release);
+}
+EXPORT_SYMBOL_GPL(usb_put_hcd);
+
+int usb_hcd_is_primary_hcd(struct usb_hcd *hcd)
+{
+ if (!hcd->primary_hcd)
+ return 1;
+ return hcd == hcd->primary_hcd;
+}
+EXPORT_SYMBOL_GPL(usb_hcd_is_primary_hcd);
+
+int usb_hcd_find_raw_port_number(struct usb_hcd *hcd, int port1)
+{
+ if (!hcd->driver->find_raw_port_number)
+ return port1;
+
+ return hcd->driver->find_raw_port_number(hcd, port1);
+}
+
+static int usb_hcd_request_irqs(struct usb_hcd *hcd,
+ unsigned int irqnum, unsigned long irqflags)
+{
+ int retval;
+
+ if (hcd->driver->irq) {
+
+ snprintf(hcd->irq_descr, sizeof(hcd->irq_descr), "%s:usb%d",
+ hcd->driver->description, hcd->self.busnum);
+ retval = request_irq(irqnum, &usb_hcd_irq, irqflags,
+ hcd->irq_descr, hcd);
+ if (retval != 0) {
+ dev_err(hcd->self.controller,
+ "request interrupt %d failed\n",
+ irqnum);
+ return retval;
+ }
+ hcd->irq = irqnum;
+ dev_info(hcd->self.controller, "irq %d, %s 0x%08llx\n", irqnum,
+ (hcd->driver->flags & HCD_MEMORY) ?
+ "io mem" : "io base",
+ (unsigned long long)hcd->rsrc_start);
+ } else {
+ hcd->irq = 0;
+ if (hcd->rsrc_start)
+ dev_info(hcd->self.controller, "%s 0x%08llx\n",
+ (hcd->driver->flags & HCD_MEMORY) ?
+ "io mem" : "io base",
+ (unsigned long long)hcd->rsrc_start);
+ }
+ return 0;
+}
+
+/*
+ * Before we free this root hub, flush in-flight peering attempts
+ * and disable peer lookups
+ */
+static void usb_put_invalidate_rhdev(struct usb_hcd *hcd)
+{
+ struct usb_device *rhdev;
+
+ mutex_lock(&usb_port_peer_mutex);
+ rhdev = hcd->self.root_hub;
+ hcd->self.root_hub = NULL;
+ mutex_unlock(&usb_port_peer_mutex);
+ usb_put_dev(rhdev);
+}
+
+/**
+ * usb_add_hcd - finish generic HCD structure initialization and register
+ * @hcd: the usb_hcd structure to initialize
+ * @irqnum: Interrupt line to allocate
+ * @irqflags: Interrupt type flags
+ *
+ * Finish the remaining parts of generic HCD initialization: allocate the
+ * buffers of consistent memory, register the bus, request the IRQ line,
+ * and call the driver's reset() and start() routines.
+ */
+int usb_add_hcd(struct usb_hcd *hcd,
+ unsigned int irqnum, unsigned long irqflags)
+{
+ int retval;
+ struct usb_device *rhdev;
+
+ if (IS_ENABLED(CONFIG_USB_PHY) && !hcd->usb_phy) {
+ struct usb_phy *phy = usb_get_phy_dev(hcd->self.controller, 0);
+
+ if (IS_ERR(phy)) {
+ retval = PTR_ERR(phy);
+ if (retval == -EPROBE_DEFER)
+ return retval;
+ } else {
+ retval = usb_phy_init(phy);
+ if (retval) {
+ usb_put_phy(phy);
+ return retval;
+ }
+ hcd->usb_phy = phy;
+ hcd->remove_phy = 1;
+ }
+ }
+
+ if (IS_ENABLED(CONFIG_GENERIC_PHY) && !hcd->phy) {
+ struct phy *phy = phy_get(hcd->self.controller, "usb");
+
+ if (IS_ERR(phy)) {
+ retval = PTR_ERR(phy);
+ if (retval == -EPROBE_DEFER)
+ goto err_phy;
+ } else {
+ retval = phy_init(phy);
+ if (retval) {
+ phy_put(phy);
+ goto err_phy;
+ }
+ retval = phy_power_on(phy);
+ if (retval) {
+ phy_exit(phy);
+ phy_put(phy);
+ goto err_phy;
+ }
+ hcd->phy = phy;
+ hcd->remove_phy = 1;
+ }
+ }
+
+ dev_info(hcd->self.controller, "%s\n", hcd->product_desc);
+
+ /* Keep old behaviour if authorized_default is not in [0, 1]. */
+ if (authorized_default < 0 || authorized_default > 1)
+ hcd->authorized_default = hcd->wireless ? 0 : 1;
+ else
+ hcd->authorized_default = authorized_default;
+ set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
+
+ /* HC is in reset state, but accessible. Now do the one-time init,
+ * bottom up so that hcds can customize the root hubs before hub_wq
+ * starts talking to them. (Note, bus id is assigned early too.)
+ */
+ if ((retval = hcd_buffer_create(hcd)) != 0) {
+ dev_dbg(hcd->self.controller, "pool alloc failed\n");
+ goto err_create_buf;
+ }
+
+ if ((retval = usb_register_bus(&hcd->self)) < 0)
+ goto err_register_bus;
+
+ if ((rhdev = usb_alloc_dev(NULL, &hcd->self, 0)) == NULL) {
+ dev_err(hcd->self.controller, "unable to allocate root hub\n");
+ retval = -ENOMEM;
+ goto err_allocate_root_hub;
+ }
+ mutex_lock(&usb_port_peer_mutex);
+ hcd->self.root_hub = rhdev;
+ mutex_unlock(&usb_port_peer_mutex);
+
+ switch (hcd->speed) {
+ case HCD_USB11:
+ rhdev->speed = USB_SPEED_FULL;
+ break;
+ case HCD_USB2:
+ rhdev->speed = USB_SPEED_HIGH;
+ break;
+ case HCD_USB25:
+ rhdev->speed = USB_SPEED_WIRELESS;
+ break;
+ case HCD_USB3:
+ rhdev->speed = USB_SPEED_SUPER;
+ break;
+ default:
+ retval = -EINVAL;
+ goto err_set_rh_speed;
+ }
+
+ /* wakeup flag init defaults to "everything works" for root hubs,
+ * but drivers can override it in reset() if needed, along with
+ * recording the overall controller's system wakeup capability.
+ */
+ device_set_wakeup_capable(&rhdev->dev, 1);
+
+ /* HCD_FLAG_RH_RUNNING doesn't matter until the root hub is
+ * registered. But since the controller can die at any time,
+ * let's initialize the flag before touching the hardware.
+ */
+ set_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
+
+ /* "reset" is misnamed; its role is now one-time init. the controller
+ * should already have been reset (and boot firmware kicked off etc).
+ */
+ if (hcd->driver->reset && (retval = hcd->driver->reset(hcd)) < 0) {
+ dev_err(hcd->self.controller, "can't setup: %d\n", retval);
+ goto err_hcd_driver_setup;
+ }
+ hcd->rh_pollable = 1;
+
+ /* NOTE: root hub and controller capabilities may not be the same */
+ if (device_can_wakeup(hcd->self.controller)
+ && device_can_wakeup(&hcd->self.root_hub->dev))
+ dev_dbg(hcd->self.controller, "supports USB remote wakeup\n");
+
+ /* initialize tasklets */
+ init_giveback_urb_bh(&hcd->high_prio_bh);
+ init_giveback_urb_bh(&hcd->low_prio_bh);
+
+ /* enable irqs just before we start the controller,
+ * if the BIOS provides legacy PCI irqs.
+ */
+ if (usb_hcd_is_primary_hcd(hcd) && irqnum) {
+ retval = usb_hcd_request_irqs(hcd, irqnum, irqflags);
+ if (retval)
+ goto err_request_irq;
+ }
+
+ hcd->state = HC_STATE_RUNNING;
+ retval = hcd->driver->start(hcd);
+ if (retval < 0) {
+ dev_err(hcd->self.controller, "startup error %d\n", retval);
+ goto err_hcd_driver_start;
+ }
+
+ /* starting here, usbcore will pay attention to this root hub */
+ if ((retval = register_root_hub(hcd)) != 0)
+ goto err_register_root_hub;
+
+ retval = sysfs_create_group(&rhdev->dev.kobj, &usb_bus_attr_group);
+ if (retval < 0) {
+ printk(KERN_ERR "Cannot register USB bus sysfs attributes: %d\n",
+ retval);
+ goto error_create_attr_group;
+ }
+ if (hcd->uses_new_polling && HCD_POLL_RH(hcd))
+ usb_hcd_poll_rh_status(hcd);
+
+ return retval;
+
+error_create_attr_group:
+ clear_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
+ if (HC_IS_RUNNING(hcd->state))
+ hcd->state = HC_STATE_QUIESCING;
+ spin_lock_irq(&hcd_root_hub_lock);
+ hcd->rh_registered = 0;
+ spin_unlock_irq(&hcd_root_hub_lock);
+
+#ifdef CONFIG_PM
+ cancel_work_sync(&hcd->wakeup_work);
+#endif
+ mutex_lock(&usb_bus_list_lock);
+ usb_disconnect(&rhdev); /* Sets rhdev to NULL */
+ mutex_unlock(&usb_bus_list_lock);
+err_register_root_hub:
+ hcd->rh_pollable = 0;
+ clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
+ del_timer_sync(&hcd->rh_timer);
+ hcd->driver->stop(hcd);
+ hcd->state = HC_STATE_HALT;
+ clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
+ del_timer_sync(&hcd->rh_timer);
+err_hcd_driver_start:
+ if (usb_hcd_is_primary_hcd(hcd) && hcd->irq > 0)
+ free_irq(irqnum, hcd);
+err_request_irq:
+err_hcd_driver_setup:
+err_set_rh_speed:
+ usb_put_invalidate_rhdev(hcd);
+err_allocate_root_hub:
+ usb_deregister_bus(&hcd->self);
+err_register_bus:
+ hcd_buffer_destroy(hcd);
+err_create_buf:
+ if (IS_ENABLED(CONFIG_GENERIC_PHY) && hcd->remove_phy && hcd->phy) {
+ phy_power_off(hcd->phy);
+ phy_exit(hcd->phy);
+ phy_put(hcd->phy);
+ hcd->phy = NULL;
+ }
+err_phy:
+ if (hcd->remove_phy && hcd->usb_phy) {
+ usb_phy_shutdown(hcd->usb_phy);
+ usb_put_phy(hcd->usb_phy);
+ hcd->usb_phy = NULL;
+ }
+ return retval;
+}
+EXPORT_SYMBOL_GPL(usb_add_hcd);
+
+/**
+ * usb_remove_hcd - shutdown processing for generic HCDs
+ * @hcd: the usb_hcd structure to remove
+ * Context: !in_interrupt()
+ *
+ * Disconnects the root hub, then reverses the effects of usb_add_hcd(),
+ * invoking the HCD's stop() method.
+ */
+void usb_remove_hcd(struct usb_hcd *hcd)
+{
+ struct usb_device *rhdev = hcd->self.root_hub;
+
+ dev_info(hcd->self.controller, "remove, state %x\n", hcd->state);
+
+ usb_get_dev(rhdev);
+ sysfs_remove_group(&rhdev->dev.kobj, &usb_bus_attr_group);
+
+ clear_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
+ if (HC_IS_RUNNING (hcd->state))
+ hcd->state = HC_STATE_QUIESCING;
+
+ dev_dbg(hcd->self.controller, "roothub graceful disconnect\n");
+ spin_lock_irq (&hcd_root_hub_lock);
+ hcd->rh_registered = 0;
+ spin_unlock_irq (&hcd_root_hub_lock);
+
+#ifdef CONFIG_PM
+ cancel_work_sync(&hcd->wakeup_work);
+#endif
+
+ mutex_lock(&usb_bus_list_lock);
+ usb_disconnect(&rhdev); /* Sets rhdev to NULL */
+ mutex_unlock(&usb_bus_list_lock);
+
+ /*
+ * tasklet_kill() isn't needed here because:
+ * - driver's disconnect() called from usb_disconnect() should
+ * make sure its URBs are completed during the disconnect()
+ * callback
+ *
+ * - it is too late to run complete() here since driver may have
+ * been removed already now
+ */
+
+ /* Prevent any more root-hub status calls from the timer.
+ * The HCD might still restart the timer (if a port status change
+ * interrupt occurs), but usb_hcd_poll_rh_status() won't invoke
+ * the hub_status_data() callback.
+ */
+ hcd->rh_pollable = 0;
+ clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
+ del_timer_sync(&hcd->rh_timer);
+
+ hcd->driver->stop(hcd);
+ hcd->state = HC_STATE_HALT;
+
+ /* In case the HCD restarted the timer, stop it again. */
+ clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
+ del_timer_sync(&hcd->rh_timer);
+
+ if (usb_hcd_is_primary_hcd(hcd)) {
+ if (hcd->irq > 0)
+ free_irq(hcd->irq, hcd);
+ }
+
+ usb_deregister_bus(&hcd->self);
+ hcd_buffer_destroy(hcd);
+
+ if (IS_ENABLED(CONFIG_GENERIC_PHY) && hcd->remove_phy && hcd->phy) {
+ phy_power_off(hcd->phy);
+ phy_exit(hcd->phy);
+ phy_put(hcd->phy);
+ hcd->phy = NULL;
+ }
+ if (hcd->remove_phy && hcd->usb_phy) {
+ usb_phy_shutdown(hcd->usb_phy);
+ usb_put_phy(hcd->usb_phy);
+ hcd->usb_phy = NULL;
+ }
+
+ usb_put_invalidate_rhdev(hcd);
+}
+EXPORT_SYMBOL_GPL(usb_remove_hcd);
+
+void
+usb_hcd_platform_shutdown(struct platform_device *dev)
+{
+ struct usb_hcd *hcd = platform_get_drvdata(dev);
+
+ if (hcd->driver->shutdown)
+ hcd->driver->shutdown(hcd);
+}
+EXPORT_SYMBOL_GPL(usb_hcd_platform_shutdown);
+
+/*-------------------------------------------------------------------------*/
+
+#if defined(CONFIG_USB_MON) || defined(CONFIG_USB_MON_MODULE)
+
+struct usb_mon_operations *mon_ops;
+
+/*
+ * The registration is unlocked.
+ * We do it this way because we do not want to lock in hot paths.
+ *
+ * Notice that the code is minimally error-proof. Because usbmon needs
+ * symbols from usbcore, usbcore gets referenced and cannot be unloaded first.
+ */
+
+int usb_mon_register (struct usb_mon_operations *ops)
+{
+
+ if (mon_ops)
+ return -EBUSY;
+
+ mon_ops = ops;
+ mb();
+ return 0;
+}
+EXPORT_SYMBOL_GPL (usb_mon_register);
+
+void usb_mon_deregister (void)
+{
+
+ if (mon_ops == NULL) {
+ printk(KERN_ERR "USB: monitor was not registered\n");
+ return;
+ }
+ mon_ops = NULL;
+ mb();
+}
+EXPORT_SYMBOL_GPL (usb_mon_deregister);
+
+#endif /* CONFIG_USB_MON || CONFIG_USB_MON_MODULE */
Code Review / kvmfornfv.git / blobdiff