diff options
Diffstat (limited to 'drivers/usb/core/hcd.c')
| -rw-r--r-- | drivers/usb/core/hcd.c | 1840 |
1 files changed, 1840 insertions, 0 deletions
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c new file mode 100644 index 000000000000..266e9e06a9f5 --- /dev/null +++ b/drivers/usb/core/hcd.c @@ -0,0 +1,1840 @@ +/* + * (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/config.h> + +#ifdef CONFIG_USB_DEBUG +#define DEBUG +#endif + +#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 <asm/scatterlist.h> +#include <linux/device.h> +#include <linux/dma-mapping.h> +#include <asm/irq.h> +#include <asm/byteorder.h> + +#include <linux/usb.h> + +#include "usb.h" +#include "hcd.h" +#include "hub.h" + + +// #define USB_BANDWIDTH_MESSAGES + +/*-------------------------------------------------------------------------*/ + +/* + * 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. + */ + +/*-------------------------------------------------------------------------*/ + +/* host controllers we manage */ +LIST_HEAD (usb_bus_list); +EXPORT_SYMBOL_GPL (usb_bus_list); + +/* used when allocating bus numbers */ +#define USB_MAXBUS 64 +struct usb_busmap { + unsigned long busmap [USB_MAXBUS / (8*sizeof (unsigned long))]; +}; +static struct usb_busmap busmap; + +/* used when updating list of hcds */ +DECLARE_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 hcd data */ +static DEFINE_SPINLOCK(hcd_data_lock); + +/* wait queue for synchronous unlinks */ +DECLARE_WAIT_QUEUE_HEAD(usb_kill_urb_queue); + +/*-------------------------------------------------------------------------*/ + +/* + * Sharable chunks of root hub code. + */ + +/*-------------------------------------------------------------------------*/ + +#define KERNEL_REL ((LINUX_VERSION_CODE >> 16) & 0x0ff) +#define KERNEL_VER ((LINUX_VERSION_CODE >> 8) & 0x0ff) + +/* 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; */ + 0x01, /* __u8 bDeviceProtocol; [ usb 2.0 single TT ]*/ + 0x08, /* __u8 bMaxPacketSize0; 8 Bytes */ + + 0x00, 0x00, /* __le16 idVendor; */ + 0x00, 0x00, /* __le16 idProduct; */ + 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 ] */ + 0x08, /* __u8 bMaxPacketSize0; 8 Bytes */ + + 0x00, 0x00, /* __le16 idVendor; */ + 0x00, 0x00, /* __le16 idProduct; */ + 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 */ + 0x02, 0x00, /* __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8) */ + 0x0c /* __u8 ep_bInterval; (256ms -- usb 2.0 spec) */ +}; + +/*-------------------------------------------------------------------------*/ + +/* + * helper routine for returning string descriptors in UTF-16LE + * input can actually be ISO-8859-1; ASCII is its 7-bit subset + */ +static int ascii2utf (char *s, u8 *utf, int utfmax) +{ + int retval; + + for (retval = 0; *s && utfmax > 1; utfmax -= 2, retval += 2) { + *utf++ = *s++; + *utf++ = 0; + } + if (utfmax > 0) { + *utf = *s; + ++retval; + } + return retval; +} + +/* + * rh_string - provides manufacturer, product and serial strings for root hub + * @id: the string ID number (1: serial number, 2: product, 3: vendor) + * @hcd: the host controller for this root hub + * @type: string describing our driver + * @data: return packet in UTF-16 LE + * @len: length of the return packet + * + * Produces either a manufacturer, product or serial number string for the + * virtual root hub device. + */ +static int rh_string ( + int id, + struct usb_hcd *hcd, + u8 *data, + int len +) { + char buf [100]; + + // language ids + if (id == 0) { + buf[0] = 4; buf[1] = 3; /* 4 bytes string data */ + buf[2] = 0x09; buf[3] = 0x04; /* MSFT-speak for "en-us" */ + len = min (len, 4); + memcpy (data, buf, len); + return len; + + // serial number + } else if (id == 1) { + strlcpy (buf, hcd->self.bus_name, sizeof buf); + + // product description + } else if (id == 2) { + strlcpy (buf, hcd->product_desc, sizeof buf); + + // id 3 == vendor description + } else if (id == 3) { + snprintf (buf, sizeof buf, "%s %s %s", system_utsname.sysname, + system_utsname.release, hcd->driver->description); + + // unsupported IDs --> "protocol stall" + } else + return -EPIPE; + + switch (len) { /* All cases fall through */ + default: + len = 2 + ascii2utf (buf, data + 2, len - 2); + case 2: + data [1] = 3; /* type == string */ + case 1: + data [0] = 2 * (strlen (buf) + 1); + case 0: + ; /* Compiler wants a statement here */ + } + return 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; + u8 tbuf [sizeof (struct usb_hub_descriptor)]; + const u8 *bufp = tbuf; + int len = 0; + int patch_wakeup = 0; + unsigned long flags; + int status = 0; + int n; + + 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; + + urb->actual_length = 0; + switch (typeReq) { + + /* DEVICE REQUESTS */ + + case DeviceRequest | USB_REQ_GET_STATUS: + tbuf [0] = (hcd->remote_wakeup << 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) + hcd->remote_wakeup = 0; + else + goto error; + break; + case DeviceOutRequest | USB_REQ_SET_FEATURE: + if (hcd->can_wakeup && wValue == USB_DEVICE_REMOTE_WAKEUP) + hcd->remote_wakeup = 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: + if (hcd->driver->flags & HCD_USB2) + bufp = usb2_rh_dev_descriptor; + else if (hcd->driver->flags & HCD_USB11) + bufp = usb11_rh_dev_descriptor; + else + goto error; + len = 18; + break; + case USB_DT_CONFIG << 8: + if (hcd->driver->flags & HCD_USB2) { + bufp = hs_rh_config_descriptor; + len = sizeof hs_rh_config_descriptor; + } else { + bufp = fs_rh_config_descriptor; + len = sizeof fs_rh_config_descriptor; + } + if (hcd->can_wakeup) + patch_wakeup = 1; + break; + case USB_DT_STRING << 8: + n = rh_string (wValue & 0xff, hcd, ubuf, wLength); + if (n < 0) + goto error; + urb->actual_length = n; + break; + 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: + /* non-generic request */ + if (HC_IS_SUSPENDED (hcd->state)) + status = -EAGAIN; + else { + switch (typeReq) { + case GetHubStatus: + case GetPortStatus: + len = 4; + break; + case GetHubDescriptor: + len = sizeof (struct usb_hub_descriptor); + break; + } + status = hcd->driver->hub_control (hcd, + typeReq, wValue, wIndex, + tbuf, wLength); + } + break; +error: + /* "protocol stall" on error */ + status = -EPIPE; + } + + if (status) { + 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, urb->status); + } + } + 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; + } + + /* any errors get returned through the urb completion */ + local_irq_save (flags); + spin_lock (&urb->lock); + if (urb->status == -EINPROGRESS) + urb->status = status; + spin_unlock (&urb->lock); + usb_hcd_giveback_urb (hcd, urb, NULL); + local_irq_restore (flags); + return 0; +} + +/*-------------------------------------------------------------------------*/ + +/* + * Root Hub interrupt transfers are synthesized with a timer. + * Completions are called in_interrupt() but not in_irq(). + * + * Note: some root hubs (including common UHCI based designs) can't + * correctly issue port change IRQs. They're the ones that _need_ a + * timer; most other root hubs don't. Some systems could save a + * lot of battery power by eliminating these root hub timer IRQs. + */ + +static void rh_report_status (unsigned long ptr); + +static int rh_status_urb (struct usb_hcd *hcd, struct urb *urb) +{ + int len = 1 + (urb->dev->maxchild / 8); + + /* rh_timer protected by hcd_data_lock */ + if (hcd->rh_timer.data || urb->transfer_buffer_length < len) { + dev_dbg (hcd->self.controller, + "not queuing rh status urb, stat %d\n", + urb->status); + return -EINVAL; + } + + init_timer (&hcd->rh_timer); + hcd->rh_timer.function = rh_report_status; + hcd->rh_timer.data = (unsigned long) urb; + /* USB 2.0 spec says 256msec; this is close enough */ + hcd->rh_timer.expires = jiffies + HZ/4; + add_timer (&hcd->rh_timer); + urb->hcpriv = hcd; /* nonzero to indicate it's queued */ + return 0; +} + +/* timer callback */ + +static void rh_report_status (unsigned long ptr) +{ + struct urb *urb; + struct usb_hcd *hcd; + int length = 0; + unsigned long flags; + + urb = (struct urb *) ptr; + local_irq_save (flags); + spin_lock (&urb->lock); + + /* do nothing if the urb's been unlinked */ + if (!urb->dev + || urb->status != -EINPROGRESS + || (hcd = urb->dev->bus->hcpriv) == NULL) { + spin_unlock (&urb->lock); + local_irq_restore (flags); + return; + } + + /* complete the status urb, or retrigger the timer */ + spin_lock (&hcd_data_lock); + if (urb->dev->state == USB_STATE_CONFIGURED) { + length = hcd->driver->hub_status_data ( + hcd, urb->transfer_buffer); + if (length > 0) { + hcd->rh_timer.data = 0; + urb->actual_length = length; + urb->status = 0; + urb->hcpriv = NULL; + } else + mod_timer (&hcd->rh_timer, jiffies + HZ/4); + } + spin_unlock (&hcd_data_lock); + spin_unlock (&urb->lock); + + /* local irqs are always blocked in completions */ + if (length > 0) + usb_hcd_giveback_urb (hcd, urb, NULL); + local_irq_restore (flags); +} + +/*-------------------------------------------------------------------------*/ + +static int rh_urb_enqueue (struct usb_hcd *hcd, struct urb *urb) +{ + if (usb_pipeint (urb->pipe)) { + int retval; + unsigned long flags; + + spin_lock_irqsave (&hcd_data_lock, flags); + retval = rh_status_urb (hcd, urb); + spin_unlock_irqrestore (&hcd_data_lock, flags); + return retval; + } + if (usb_pipecontrol (urb->pipe)) + return rh_call_control (hcd, urb); + else + return -EINVAL; +} + +/*-------------------------------------------------------------------------*/ + +static int usb_rh_urb_dequeue (struct usb_hcd *hcd, struct urb *urb) +{ + unsigned long flags; + + /* note: always a synchronous unlink */ + if ((unsigned long) urb == hcd->rh_timer.data) { + del_timer_sync (&hcd->rh_timer); + hcd->rh_timer.data = 0; + + local_irq_save (flags); + urb->hcpriv = NULL; + usb_hcd_giveback_urb (hcd, urb, NULL); + local_irq_restore (flags); + + } else if (usb_pipeendpoint(urb->pipe) == 0) { + spin_lock_irq(&urb->lock); /* from usb_kill_urb */ + ++urb->reject; + spin_unlock_irq(&urb->lock); + + wait_event(usb_kill_urb_queue, + atomic_read(&urb->use_count) == 0); + + spin_lock_irq(&urb->lock); + --urb->reject; + spin_unlock_irq(&urb->lock); + } else + return -EINVAL; + + return 0; +} + +/*-------------------------------------------------------------------------*/ + +/* exported only within usbcore */ +struct usb_bus *usb_bus_get (struct usb_bus *bus) +{ + struct class_device *tmp; + + if (!bus) + return NULL; + + tmp = class_device_get(&bus->class_dev); + if (tmp) + return to_usb_bus(tmp); + else + return NULL; +} + +/* exported only within usbcore */ +void usb_bus_put (struct usb_bus *bus) +{ + if (bus) + class_device_put(&bus->class_dev); +} + +/*-------------------------------------------------------------------------*/ + +static void usb_host_release(struct class_device *class_dev) +{ + struct usb_bus *bus = to_usb_bus(class_dev); + + if (bus->release) + bus->release(bus); +} + +static struct class usb_host_class = { + .name = "usb_host", + .release = &usb_host_release, +}; + +int usb_host_init(void) +{ + return class_register(&usb_host_class); +} + +void usb_host_cleanup(void) +{ + class_unregister(&usb_host_class); +} + +/** + * 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->hcpriv = NULL; + bus->busnum = -1; + bus->bandwidth_allocated = 0; + bus->bandwidth_int_reqs = 0; + bus->bandwidth_isoc_reqs = 0; + + INIT_LIST_HEAD (&bus->bus_list); + + class_device_initialize(&bus->class_dev); + bus->class_dev.class = &usb_host_class; +} + +/** + * usb_alloc_bus - creates a new USB host controller structure + * @op: pointer to a struct usb_operations that this bus structure should use + * Context: !in_interrupt() + * + * Creates a USB host controller bus structure with the specified + * usb_operations and initializes all the necessary internal objects. + * + * If no memory is available, NULL is returned. + * + * The caller should call usb_put_bus() when it is finished with the structure. + */ +struct usb_bus *usb_alloc_bus (struct usb_operations *op) +{ + struct usb_bus *bus; + + bus = kmalloc (sizeof *bus, GFP_KERNEL); + if (!bus) + return NULL; + memset(bus, 0, sizeof(struct usb_bus)); + usb_bus_init (bus); + bus->op = op; + return bus; +} + +/*-------------------------------------------------------------------------*/ + +/** + * 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. + */ +static int usb_register_bus(struct usb_bus *bus) +{ + int busnum; + int retval; + + down (&usb_bus_list_lock); + busnum = find_next_zero_bit (busmap.busmap, USB_MAXBUS, 1); + if (busnum < USB_MAXBUS) { + set_bit (busnum, busmap.busmap); + bus->busnum = busnum; + } else { + printk (KERN_ERR "%s: too many buses\n", usbcore_name); + up(&usb_bus_list_lock); + return -E2BIG; + } + + snprintf(bus->class_dev.class_id, BUS_ID_SIZE, "usb%d", busnum); + bus->class_dev.dev = bus->controller; + retval = class_device_add(&bus->class_dev); + if (retval) { + clear_bit(busnum, busmap.busmap); + up(&usb_bus_list_lock); + return retval; + } + + /* Add it to the local list of buses */ + list_add (&bus->bus_list, &usb_bus_list); + up (&usb_bus_list_lock); + + usbfs_add_bus (bus); + usbmon_notify_bus_add (bus); + + dev_info (bus->controller, "new USB bus registered, assigned bus number %d\n", bus->busnum); + return 0; +} + +/** + * 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 + */ + down (&usb_bus_list_lock); + list_del (&bus->bus_list); + up (&usb_bus_list_lock); + + usbmon_notify_bus_remove (bus); + usbfs_remove_bus (bus); + + clear_bit (bus->busnum, busmap.busmap); + + class_device_del(&bus->class_dev); +} + +/** + * usb_hcd_register_root_hub - called by HCD to register its root hub + * @usb_dev: the usb root hub device to be registered. + * @hcd: host controller for this root hub + * + * The USB host controller calls this function to register the root hub + * properly with the USB subsystem. It sets up the device properly in + * the device tree and stores the root_hub pointer in the bus structure, + * then calls usb_new_device() to register the usb device. It also + * assigns the root hub's USB address (always 1). + */ +int usb_hcd_register_root_hub (struct usb_device *usb_dev, struct usb_hcd *hcd) +{ + struct device *parent_dev = hcd->self.controller; + const int devnum = 1; + int retval; + + /* hcd->driver->start() reported can_wakeup, probably with + * assistance from board's boot firmware. + * NOTE: normal devices won't enable wakeup by default. + */ + if (hcd->can_wakeup) + dev_dbg (parent_dev, "supports USB remote wakeup\n"); + hcd->remote_wakeup = hcd->can_wakeup; + + 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); + + down (&usb_bus_list_lock); + usb_dev->bus->root_hub = usb_dev; + + usb_dev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64); + retval = usb_get_device_descriptor(usb_dev, USB_DT_DEVICE_SIZE); + if (retval != sizeof usb_dev->descriptor) { + usb_dev->bus->root_hub = NULL; + up (&usb_bus_list_lock); + dev_dbg (parent_dev, "can't read %s device descriptor %d\n", + usb_dev->dev.bus_id, retval); + return (retval < 0) ? retval : -EMSGSIZE; + } + + usb_lock_device (usb_dev); + retval = usb_new_device (usb_dev); + usb_unlock_device (usb_dev); + if (retval) { + usb_dev->bus->root_hub = NULL; + dev_err (parent_dev, "can't register root hub for %s, %d\n", + usb_dev->dev.bus_id, retval); + } + up (&usb_bus_list_lock); + + if (retval == 0) { + 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->state == HC_STATE_HALT) + usb_hc_died (hcd); /* This time clean up */ + } + + return retval; +} +EXPORT_SYMBOL_GPL(usb_hcd_register_root_hub); + + +/*-------------------------------------------------------------------------*/ + +/** + * 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. + * + * Returns approximate bus time in nanoseconds for a periodic transaction. + * 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_USECS (bytecount); + else + tmp = HS_USECS_ISO (bytecount); + return tmp; + default: + pr_debug ("%s: bogus device speed!\n", usbcore_name); + return -1; + } +} +EXPORT_SYMBOL (usb_calc_bus_time); + +/* + * usb_check_bandwidth(): + * + * old_alloc is from host_controller->bandwidth_allocated in microseconds; + * bustime is from calc_bus_time(), but converted to microseconds. + * + * returns <bustime in us> if successful, + * or -ENOSPC if bandwidth request fails. + * + * FIXME: + * This initial implementation does not use Endpoint.bInterval + * in managing bandwidth allocation. + * It probably needs to be expanded to use Endpoint.bInterval. + * This can be done as a later enhancement (correction). + * + * This will also probably require some kind of + * frame allocation tracking...meaning, for example, + * that if multiple drivers request interrupts every 10 USB frames, + * they don't all have to be allocated at + * frame numbers N, N+10, N+20, etc. Some of them could be at + * N+11, N+21, N+31, etc., and others at + * N+12, N+22, N+32, etc. + * + * Similarly for isochronous transfers... + * + * Individual HCDs can schedule more directly ... this logic + * is not correct for high speed transfers. + */ +int usb_check_bandwidth (struct usb_device *dev, struct urb *urb) +{ + unsigned int pipe = urb->pipe; + long bustime; + int is_in = usb_pipein (pipe); + int is_iso = usb_pipeisoc (pipe); + int old_alloc = dev->bus->bandwidth_allocated; + int new_alloc; + + + bustime = NS_TO_US (usb_calc_bus_time (dev->speed, is_in, is_iso, + usb_maxpacket (dev, pipe, !is_in))); + if (is_iso) + bustime /= urb->number_of_packets; + + new_alloc = old_alloc + (int) bustime; + if (new_alloc > FRAME_TIME_MAX_USECS_ALLOC) { +#ifdef DEBUG + char *mode = +#ifdef CONFIG_USB_BANDWIDTH + ""; +#else + "would have "; +#endif + dev_dbg (&dev->dev, "usb_check_bandwidth %sFAILED: %d + %ld = %d usec\n", + mode, old_alloc, bustime, new_alloc); +#endif +#ifdef CONFIG_USB_BANDWIDTH + bustime = -ENOSPC; /* report error */ +#endif + } + + return bustime; +} +EXPORT_SYMBOL (usb_check_bandwidth); + + +/** + * usb_claim_bandwidth - records bandwidth for a periodic transfer + * @dev: source/target of request + * @urb: request (urb->dev == dev) + * @bustime: bandwidth consumed, in (average) microseconds per frame + * @isoc: true iff the request is isochronous + * + * Bus bandwidth reservations are recorded purely for diagnostic purposes. + * HCDs are expected not to overcommit periodic bandwidth, and to record such + * reservations whenever endpoints are added to the periodic schedule. + * + * FIXME averaging per-frame is suboptimal. Better to sum over the HCD's + * entire periodic schedule ... 32 frames for OHCI, 1024 for UHCI, settable + * for EHCI (256/512/1024 frames, default 1024) and have the bus expose how + * large its periodic schedule is. + */ +void usb_claim_bandwidth (struct usb_device *dev, struct urb *urb, int bustime, int isoc) +{ + dev->bus->bandwidth_allocated += bustime; + if (isoc) + dev->bus->bandwidth_isoc_reqs++; + else + dev->bus->bandwidth_int_reqs++; + urb->bandwidth = bustime; + +#ifdef USB_BANDWIDTH_MESSAGES + dev_dbg (&dev->dev, "bandwidth alloc increased by %d (%s) to %d for %d requesters\n", + bustime, + isoc ? "ISOC" : "INTR", + dev->bus->bandwidth_allocated, + dev->bus->bandwidth_int_reqs + dev->bus->bandwidth_isoc_reqs); +#endif +} +EXPORT_SYMBOL (usb_claim_bandwidth); + + +/** + * usb_release_bandwidth - reverses effect of usb_claim_bandwidth() + * @dev: source/target of request + * @urb: request (urb->dev == dev) + * @isoc: true iff the request is isochronous + * + * This records that previously allocated bandwidth has been released. + * Bandwidth is released when endpoints are removed from the host controller's + * periodic schedule. + */ +void usb_release_bandwidth (struct usb_device *dev, struct urb *urb, int isoc) +{ + dev->bus->bandwidth_allocated -= urb->bandwidth; + if (isoc) + dev->bus->bandwidth_isoc_reqs--; + else + dev->bus->bandwidth_int_reqs--; + +#ifdef USB_BANDWIDTH_MESSAGES + dev_dbg (&dev->dev, "bandwidth alloc reduced by %d (%s) to %d for %d requesters\n", + urb->bandwidth, + isoc ? "ISOC" : "INTR", + dev->bus->bandwidth_allocated, + dev->bus->bandwidth_int_reqs + dev->bus->bandwidth_isoc_reqs); +#endif + urb->bandwidth = 0; +} +EXPORT_SYMBOL (usb_release_bandwidth); + + +/*-------------------------------------------------------------------------*/ + +/* + * Generic HC operations. + */ + +/*-------------------------------------------------------------------------*/ + +static void urb_unlink (struct urb *urb) +{ + unsigned long flags; + + /* Release any periodic transfer bandwidth */ + if (urb->bandwidth) + usb_release_bandwidth (urb->dev, urb, + usb_pipeisoc (urb->pipe)); + + /* clear all state linking urb to this dev (and hcd) */ + + spin_lock_irqsave (&hcd_data_lock, flags); + list_del_init (&urb->urb_list); + spin_unlock_irqrestore (&hcd_data_lock, flags); + usb_put_dev (urb->dev); +} + + +/* 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 + */ +static int hcd_submit_urb (struct urb *urb, int mem_flags) +{ + int status; + struct usb_hcd *hcd = urb->dev->bus->hcpriv; + struct usb_host_endpoint *ep; + unsigned long flags; + + if (!hcd) + return -ENODEV; + + usbmon_urb_submit(&hcd->self, urb); + + /* + * Atomically queue the urb, first to our records, then to the HCD. + * Access to urb->status is controlled by urb->lock ... changes on + * i/o completion (normal or fault) or unlinking. + */ + + // FIXME: verify that quiescing hc works right (RH cleans up) + + spin_lock_irqsave (&hcd_data_lock, flags); + ep = (usb_pipein(urb->pipe) ? urb->dev->ep_in : urb->dev->ep_out) + [usb_pipeendpoint(urb->pipe)]; + if (unlikely (!ep)) + status = -ENOENT; + else if (unlikely (urb->reject)) + status = -EPERM; + else switch (hcd->state) { + case HC_STATE_RUNNING: + case HC_STATE_RESUMING: + usb_get_dev (urb->dev); + list_add_tail (&urb->urb_list, &ep->urb_list); + status = 0; + break; + default: + status = -ESHUTDOWN; + break; + } + spin_unlock_irqrestore (&hcd_data_lock, flags); + if (status) { + INIT_LIST_HEAD (&urb->urb_list); + usbmon_urb_submit_error(&hcd->self, urb, status); + return status; + } + + /* increment urb's reference count as part of giving it to the HCD + * (which now controls it). HCD guarantees that it either returns + * an error or calls giveback(), but not both. + */ + urb = usb_get_urb (urb); + atomic_inc (&urb->use_count); + + if (urb->dev == hcd->self.root_hub) { + /* NOTE: requirement on hub callers (usbfs and the hub + * driver, for now) that URBs' urb->transfer_buffer be + * valid and usb_buffer_{sync,unmap}() not be needed, since + * they could clobber root hub response data. + */ + status = rh_urb_enqueue (hcd, urb); + goto done; + } + + /* lower level hcd code should use *_dma exclusively, + * unless it uses pio or talks to another transport. + */ + if (hcd->self.controller->dma_mask) { + if (usb_pipecontrol (urb->pipe) + && !(urb->transfer_flags & URB_NO_SETUP_DMA_MAP)) + urb->setup_dma = dma_map_single ( + hcd->self.controller, + urb->setup_packet, + sizeof (struct usb_ctrlrequest), + DMA_TO_DEVICE); + if (urb->transfer_buffer_length != 0 + && !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP)) + urb->transfer_dma = dma_map_single ( + hcd->self.controller, + urb->transfer_buffer, + urb->transfer_buffer_length, + usb_pipein (urb->pipe) + ? DMA_FROM_DEVICE + : DMA_TO_DEVICE); + } + + status = hcd->driver->urb_enqueue (hcd, ep, urb, mem_flags); +done: + if (unlikely (status)) { + urb_unlink (urb); + atomic_dec (&urb->use_count); + if (urb->reject) + wake_up (&usb_kill_urb_queue); + usb_put_urb (urb); + usbmon_urb_submit_error(&hcd->self, urb, status); + } + return status; +} + +/*-------------------------------------------------------------------------*/ + +/* called in any context */ +static int hcd_get_frame_number (struct usb_device *udev) +{ + struct usb_hcd *hcd = (struct usb_hcd *)udev->bus->hcpriv; + if (!HC_IS_RUNNING (hcd->state)) + return -ESHUTDOWN; + return hcd->driver->get_frame_number (hcd); +} + +/*-------------------------------------------------------------------------*/ + +/* 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 value; + + if (urb->dev == hcd->self.root_hub) + value = usb_rh_urb_dequeue (hcd, urb); + 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); + } + + if (value != 0) + dev_dbg (hcd->self.controller, "dequeue %p --> %d\n", + urb, value); + return value; +} + +/* + * called in any context + * + * caller guarantees urb won't be recycled till both unlink() + * and the urb's completion function return + */ +static int hcd_unlink_urb (struct urb *urb, int status) +{ + struct usb_host_endpoint *ep; + struct usb_hcd *hcd = NULL; + struct device *sys = NULL; + unsigned long flags; + struct list_head *tmp; + int retval; + + if (!urb) + return -EINVAL; + if (!urb->dev || !urb->dev->bus) + return -ENODEV; + ep = (usb_pipein(urb->pipe) ? urb->dev->ep_in : urb->dev->ep_out) + [usb_pipeendpoint(urb->pipe)]; + if (!ep) + return -ENODEV; + + /* + * we contend for urb->status with the hcd core, + * which changes it while returning the urb. + * + * Caller guaranteed that the urb pointer hasn't been freed, and + * that it was submitted. But as a rule it can't know whether or + * not it's already been unlinked ... so we respect the reversed + * lock sequence needed for the usb_hcd_giveback_urb() code paths + * (urb lock, then hcd_data_lock) in case some other CPU is now + * unlinking it. + */ + spin_lock_irqsave (&urb->lock, flags); + spin_lock (&hcd_data_lock); + + sys = &urb->dev->dev; + hcd = urb->dev->bus->hcpriv; + if (hcd == NULL) { + retval = -ENODEV; + goto done; + } + + /* running ~= hc unlink handshake works (irq, timer, etc) + * halted ~= no unlink handshake is needed + * suspended, resuming == should never happen + */ + WARN_ON (!HC_IS_RUNNING (hcd->state) && hcd->state != HC_STATE_HALT); + + /* insist the urb is still queued */ + list_for_each(tmp, &ep->urb_list) { + if (tmp == &urb->urb_list) + break; + } + if (tmp != &urb->urb_list) { + retval = -EIDRM; + goto done; + } + + /* 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->status != -EINPROGRESS) { + retval = -EBUSY; + goto done; + } + + /* IRQ setup can easily be broken so that USB controllers + * never get completion IRQs ... maybe even the ones we need to + * finish unlinking the initial failed usb_set_address() + * or device descriptor fetch. + */ + if (!hcd->saw_irq && hcd->self.root_hub != urb->dev) { + dev_warn (hcd->self.controller, "Unlink after no-IRQ? " + "Controller is probably using the wrong IRQ." + "\n"); + hcd->saw_irq = 1; + } + + urb->status = status; + + spin_unlock (&hcd_data_lock); + spin_unlock_irqrestore (&urb->lock, flags); + + retval = unlink1 (hcd, urb); + if (retval == 0) + retval = -EINPROGRESS; + return retval; + +done: + spin_unlock (&hcd_data_lock); + spin_unlock_irqrestore (&urb->lock, flags); + if (retval != -EIDRM && sys && sys->driver) + dev_dbg (sys, "hcd_unlink_urb %p fail %d\n", urb, retval); + return retval; +} + +/*-------------------------------------------------------------------------*/ + +/* disables the endpoint: cancels any pending urbs, then synchronizes with + * the hcd to make sure all endpoint state is gone from hardware. 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. + */ +static void +hcd_endpoint_disable (struct usb_device *udev, struct usb_host_endpoint *ep) +{ + struct usb_hcd *hcd; + struct urb *urb; + + hcd = udev->bus->hcpriv; + + WARN_ON (!HC_IS_RUNNING (hcd->state) && hcd->state != HC_STATE_HALT); + + local_irq_disable (); + + /* FIXME move most of this into message.c as part of its + * endpoint disable logic + */ + + /* ep is already gone from udev->ep_{in,out}[]; no more submits */ +rescan: + spin_lock (&hcd_data_lock); + list_for_each_entry (urb, &ep->urb_list, urb_list) { + int tmp; + + /* another cpu may be in hcd, spinning on hcd_data_lock + * to giveback() this urb. the races here should be + * small, but a full fix needs a new "can't submit" + * urb state. + * FIXME urb->reject should allow that... + */ + if (urb->status != -EINPROGRESS) + continue; + usb_get_urb (urb); + spin_unlock (&hcd_data_lock); + + spin_lock (&urb->lock); + tmp = urb->status; + if (tmp == -EINPROGRESS) + urb->status = -ESHUTDOWN; + spin_unlock (&urb->lock); + + /* kick hcd unless it's already returning this */ + if (tmp == -EINPROGRESS) { + tmp = urb->pipe; + unlink1 (hcd, urb); + dev_dbg (hcd->self.controller, + "shutdown urb %p pipe %08x ep%d%s%s\n", + urb, tmp, usb_pipeendpoint (tmp), + (tmp & USB_DIR_IN) ? "in" : "out", + ({ char *s; \ + switch (usb_pipetype (tmp)) { \ + case PIPE_CONTROL: s = ""; break; \ + case PIPE_BULK: s = "-bulk"; break; \ + case PIPE_INTERRUPT: s = "-intr"; break; \ + default: s = "-iso"; break; \ + }; s;})); + } + usb_put_urb (urb); + + /* list contents may have changed */ + goto rescan; + } + spin_unlock (&hcd_data_lock); + local_irq_enable (); + + /* synchronize with the hardware, so old configuration state + * clears out immediately (and will be freed). + */ + might_sleep (); + if (hcd->driver->endpoint_disable) + hcd->driver->endpoint_disable (hcd, ep); +} + +/*-------------------------------------------------------------------------*/ + +#ifdef CONFIG_USB_SUSPEND + +static int hcd_hub_suspend (struct usb_bus *bus) +{ + struct usb_hcd *hcd; + + hcd = container_of (bus, struct usb_hcd, self); + if (hcd->driver->hub_suspend) + return hcd->driver->hub_suspend (hcd); + return 0; +} + +static int hcd_hub_resume (struct usb_bus *bus) +{ + struct usb_hcd *hcd; + + hcd = container_of (bus, struct usb_hcd, self); + if (hcd->driver->hub_resume) + return hcd->driver->hub_resume (hcd); + return 0; +} + +/** + * 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. It queues a request for khubd to + * resume the root hub. + */ +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) + usb_resume_root_hub (hcd->self.root_hub); + spin_unlock_irqrestore (&hcd_root_hub_lock, flags); +} + +#else +void usb_hcd_resume_root_hub (struct usb_hcd *hcd) +{ +} +#endif +EXPORT_SYMBOL_GPL(usb_hcd_resume_root_hub); + +/*-------------------------------------------------------------------------*/ + +#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 + * khubd 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. + */ +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); + + /* run khubd 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 (usb_bus_start_enum); + +#endif + +/*-------------------------------------------------------------------------*/ + +/* + * usb_hcd_operations - adapts usb_bus framework to HCD framework (bus glue) + */ +static struct usb_operations usb_hcd_operations = { + .get_frame_number = hcd_get_frame_number, + .submit_urb = hcd_submit_urb, + .unlink_urb = hcd_unlink_urb, + .buffer_alloc = hcd_buffer_alloc, + .buffer_free = hcd_buffer_free, + .disable = hcd_endpoint_disable, +#ifdef CONFIG_USB_SUSPEND + .hub_suspend = hcd_hub_suspend, + .hub_resume = hcd_hub_resume, +#endif +}; + +/*-------------------------------------------------------------------------*/ + +/** + * 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. + * @regs: pt_regs, passed down to the URB completion handler + * 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. + */ +void usb_hcd_giveback_urb (struct usb_hcd *hcd, struct urb *urb, struct pt_regs *regs) +{ + int at_root_hub; + + at_root_hub = (urb->dev == hcd->self.root_hub); + urb_unlink (urb); + + /* lower level hcd code should use *_dma exclusively */ + if (hcd->self.controller->dma_mask && !at_root_hub) { + if (usb_pipecontrol (urb->pipe) + && !(urb->transfer_flags & URB_NO_SETUP_DMA_MAP)) + dma_unmap_single (hcd->self.controller, urb->setup_dma, + sizeof (struct usb_ctrlrequest), + DMA_TO_DEVICE); + if (urb->transfer_buffer_length != 0 + && !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP)) + dma_unmap_single (hcd->self.controller, + urb->transfer_dma, + urb->transfer_buffer_length, + usb_pipein (urb->pipe) + ? DMA_FROM_DEVICE + : DMA_TO_DEVICE); + } + + usbmon_urb_complete (&hcd->self, urb); + /* pass ownership to the completion handler */ + urb->complete (urb, regs); + atomic_dec (&urb->use_count); + if (unlikely (urb->reject)) + wake_up (&usb_kill_urb_queue); + usb_put_urb (urb); +} +EXPORT_SYMBOL (usb_hcd_giveback_urb); + +/*-------------------------------------------------------------------------*/ + +/** + * 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 + * @r: saved hardware registers + * + * If the controller isn't HALTed, calls the driver's irq handler. + * Checks whether the controller is now dead. + */ +irqreturn_t usb_hcd_irq (int irq, void *__hcd, struct pt_regs * r) +{ + struct usb_hcd *hcd = __hcd; + int start = hcd->state; + + if (start == HC_STATE_HALT) + return IRQ_NONE; + if (hcd->driver->irq (hcd, r) == IRQ_NONE) + return IRQ_NONE; + + hcd->saw_irq = 1; + if (hcd->state != start && hcd->state == HC_STATE_HALT) + usb_hc_died (hcd); + return IRQ_HANDLED; +} + +/*-------------------------------------------------------------------------*/ + +/** + * 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. + */ +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); + if (hcd->rh_registered) { + + /* make khubd clean up old urbs and devices */ + usb_set_device_state (hcd->self.root_hub, + USB_STATE_NOTATTACHED); + usb_kick_khubd (hcd->self.root_hub); + } + spin_unlock_irqrestore (&hcd_root_hub_lock, flags); +} +EXPORT_SYMBOL_GPL (usb_hc_died); + +/*-------------------------------------------------------------------------*/ + +static void hcd_release (struct usb_bus *bus) +{ + struct usb_hcd *hcd; + + hcd = container_of(bus, struct usb_hcd, self); + kfree(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. + * + * If memory is unavailable, returns NULL. + */ +struct usb_hcd *usb_create_hcd (const struct hc_driver *driver, + struct device *dev, char *bus_name) +{ + struct usb_hcd *hcd; + + hcd = kcalloc(1, sizeof(*hcd) + driver->hcd_priv_size, GFP_KERNEL); + if (!hcd) { + dev_dbg (dev, "hcd alloc failed\n"); + return NULL; + } + dev_set_drvdata(dev, hcd); + + usb_bus_init(&hcd->self); + hcd->self.op = &usb_hcd_operations; + hcd->self.hcpriv = hcd; + hcd->self.release = &hcd_release; + hcd->self.controller = dev; + hcd->self.bus_name = bus_name; + + init_timer(&hcd->rh_timer); + + hcd->driver = driver; + hcd->product_desc = (driver->product_desc) ? driver->product_desc : + "USB Host Controller"; + + return hcd; +} +EXPORT_SYMBOL (usb_create_hcd); + +void usb_put_hcd (struct usb_hcd *hcd) +{ + dev_set_drvdata(hcd->self.controller, NULL); + usb_bus_put(&hcd->self); +} +EXPORT_SYMBOL (usb_put_hcd); + +/** + * 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; + + dev_info(hcd->self.controller, "%s\n", hcd->product_desc); + + /* till now HC has been in an indeterminate state ... */ + if (hcd->driver->reset && (retval = hcd->driver->reset(hcd)) < 0) { + dev_err(hcd->self.controller, "can't reset\n"); + return retval; + } + + if ((retval = hcd_buffer_create(hcd)) != 0) { + dev_dbg(hcd->self.controller, "pool alloc failed\n"); + return retval; + } + + if ((retval = usb_register_bus(&hcd->self)) < 0) + goto err1; + + if (hcd->driver->irq) { + char buf[8], *bufp = buf; + +#ifdef __sparc__ + bufp = __irq_itoa(irqnum); +#else + sprintf(buf, "%d", irqnum); +#endif + + snprintf(hcd->irq_descr, sizeof(hcd->irq_descr), "%s:usb%d", + hcd->driver->description, hcd->self.busnum); + if ((retval = request_irq(irqnum, &usb_hcd_irq, irqflags, + hcd->irq_descr, hcd)) != 0) { + dev_err(hcd->self.controller, + "request interrupt %s failed\n", bufp); + goto err2; + } + hcd->irq = irqnum; + dev_info(hcd->self.controller, "irq %s, %s 0x%08llx\n", bufp, + (hcd->driver->flags & HCD_MEMORY) ? + "io mem" : "io base", + (unsigned long long)hcd->rsrc_start); + } else { + hcd->irq = -1; + 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); + } + + if ((retval = hcd->driver->start(hcd)) < 0) { + dev_err(hcd->self.controller, "startup error %d\n", retval); + goto err3; + } + + return retval; + + err3: + if (hcd->irq >= 0) + free_irq(irqnum, hcd); + err2: + usb_deregister_bus(&hcd->self); + err1: + hcd_buffer_destroy(hcd); + return retval; +} +EXPORT_SYMBOL (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) +{ + dev_info(hcd->self.controller, "remove, state %x\n", hcd->state); + + 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); + usb_disconnect(&hcd->self.root_hub); + + hcd->driver->stop(hcd); + hcd->state = HC_STATE_HALT; + + if (hcd->irq >= 0) + free_irq(hcd->irq, hcd); + usb_deregister_bus(&hcd->self); + hcd_buffer_destroy(hcd); +} +EXPORT_SYMBOL (usb_remove_hcd); + +/*-------------------------------------------------------------------------*/ + +#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 */ |