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-rw-r--r--drivers/usb/core/usb.c1397
1 files changed, 1397 insertions, 0 deletions
diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
new file mode 100644
index 0000000000..76e033eb7b
--- /dev/null
+++ b/drivers/usb/core/usb.c
@@ -0,0 +1,1397 @@
+/*
+ *
+ * Most of this source has been derived from the Linux USB
+ * project:
+ * (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 (new USB architecture)
+ * (C) Copyright Randy Dunlap 2000
+ * (C) Copyright David Brownell 2000 (kernel hotplug, usb_device_id)
+ * (C) Copyright Yggdrasil Computing, Inc. 2000
+ * (usb_device_id matching changes by Adam J. Richter)
+ *
+ * Adapted for barebox:
+ * (C) Copyright 2001 Denis Peter, MPL AG Switzerland
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ */
+
+/*
+ * How it works:
+ *
+ * Since this is a bootloader, the devices will not be automatic
+ * (re)configured on hotplug, but after a restart of the USB the
+ * device should work.
+ *
+ * For each transfer (except "Interrupt") we wait for completion.
+ */
+#include <common.h>
+#include <command.h>
+#include <malloc.h>
+#include <driver.h>
+#include <linux/ctype.h>
+#include <asm/byteorder.h>
+#include <xfuncs.h>
+#include <init.h>
+
+#include <usb/usb.h>
+
+/* #define USB_DEBUG */
+
+#ifdef USB_DEBUG
+#define USB_PRINTF(fmt, args...) printf(fmt , ##args)
+#else
+#define USB_PRINTF(fmt, args...)
+#endif
+
+#define USB_BUFSIZ 512
+
+static int dev_index;
+static int asynch_allowed;
+static struct devrequest setup_packet;
+
+static int usb_hub_probe(struct usb_device *dev, int ifnum);
+static int hub_port_reset(struct usb_device *dev, int port,
+ unsigned short *portstat);
+
+static LIST_HEAD(host_list);
+static LIST_HEAD(usb_device_list);
+
+static void print_usb_device(struct usb_device *dev)
+{
+ printf("%s: %04x:%04x %s\n", dev->dev.name,
+ dev->descriptor.idVendor,
+ dev->descriptor.idProduct,
+ dev->prod);
+}
+
+static int host_busnum;
+
+int usb_register_host(struct usb_host *host)
+{
+ list_add_tail(&host->list, &host_list);
+ host->busnum = host_busnum++;
+ asynch_allowed = 1;
+ return 0;
+}
+
+/**
+ * set configuration number to configuration
+ */
+static int usb_set_configuration(struct usb_device *dev, int configuration)
+{
+ int res;
+ USB_PRINTF("set configuration %d\n", configuration);
+ /* set setup command */
+ res = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
+ USB_REQ_SET_CONFIGURATION, 0,
+ configuration, 0,
+ NULL, 0, USB_CNTL_TIMEOUT);
+ if (res == 0) {
+ dev->toggle[0] = 0;
+ dev->toggle[1] = 0;
+ return 0;
+ } else
+ return -1;
+}
+
+/* The routine usb_set_maxpacket_ep() is extracted from the loop of routine
+ * usb_set_maxpacket(), because the optimizer of GCC 4.x chokes on this routine
+ * when it is inlined in 1 single routine. What happens is that the register r3
+ * is used as loop-count 'i', but gets overwritten later on.
+ * This is clearly a compiler bug, but it is easier to workaround it here than
+ * to update the compiler (Occurs with at least several GCC 4.{1,2},x
+ * CodeSourcery compilers like e.g. 2007q3, 2008q1, 2008q3 lite editions on ARM)
+ */
+static void noinline
+usb_set_maxpacket_ep(struct usb_device *dev, struct usb_endpoint_descriptor *ep)
+{
+ int b;
+
+ b = ep->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
+
+ if ((ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
+ USB_ENDPOINT_XFER_CONTROL) {
+ /* Control => bidirectional */
+ dev->epmaxpacketout[b] = ep->wMaxPacketSize;
+ dev->epmaxpacketin[b] = ep->wMaxPacketSize;
+ USB_PRINTF("##Control EP epmaxpacketout/in[%d] = %d\n",
+ b, dev->epmaxpacketin[b]);
+ } else {
+ if ((ep->bEndpointAddress & 0x80) == 0) {
+ /* OUT Endpoint */
+ if (ep->wMaxPacketSize > dev->epmaxpacketout[b]) {
+ dev->epmaxpacketout[b] = ep->wMaxPacketSize;
+ USB_PRINTF("##EP epmaxpacketout[%d] = %d\n",
+ b, dev->epmaxpacketout[b]);
+ }
+ } else {
+ /* IN Endpoint */
+ if (ep->wMaxPacketSize > dev->epmaxpacketin[b]) {
+ dev->epmaxpacketin[b] = ep->wMaxPacketSize;
+ USB_PRINTF("##EP epmaxpacketin[%d] = %d\n",
+ b, dev->epmaxpacketin[b]);
+ }
+ } /* if out */
+ } /* if control */
+}
+
+/*
+ * set the max packed value of all endpoints in the given configuration
+ */
+static int usb_set_maxpacket(struct usb_device *dev)
+{
+ int i, ii;
+
+ for (i = 0; i < dev->config.bNumInterfaces; i++)
+ for (ii = 0; ii < dev->config.if_desc[i].bNumEndpoints; ii++)
+ usb_set_maxpacket_ep(dev,
+ &dev->config.if_desc[i].ep_desc[ii]);
+
+ return 0;
+}
+
+/**
+ * Parse the config, located in buffer, and fills the dev->config structure.
+ * Note that all little/big endian swapping are done automatically.
+ */
+static int usb_parse_config(struct usb_device *dev, unsigned char *buffer, int cfgno)
+{
+ struct usb_descriptor_header *head;
+ int index, ifno, epno, curr_if_num;
+ int i;
+ unsigned char *ch;
+
+ ifno = -1;
+ epno = -1;
+ curr_if_num = -1;
+
+ dev->configno = cfgno;
+ head = (struct usb_descriptor_header *) &buffer[0];
+ if (head->bDescriptorType != USB_DT_CONFIG) {
+ printf(" ERROR: NOT USB_CONFIG_DESC %x\n",
+ head->bDescriptorType);
+ return -1;
+ }
+ memcpy(&dev->config, buffer, buffer[0]);
+ le16_to_cpus(&(dev->config.wTotalLength));
+ dev->config.no_of_if = 0;
+
+ index = dev->config.bLength;
+ /* Ok the first entry must be a configuration entry,
+ * now process the others */
+ head = (struct usb_descriptor_header *) &buffer[index];
+ while (index + 1 < dev->config.wTotalLength) {
+ switch (head->bDescriptorType) {
+ case USB_DT_INTERFACE:
+ if (((struct usb_interface_descriptor *) \
+ &buffer[index])->bInterfaceNumber != curr_if_num) {
+ /* this is a new interface, copy new desc */
+ ifno = dev->config.no_of_if;
+ dev->config.no_of_if++;
+ memcpy(&dev->config.if_desc[ifno],
+ &buffer[index], buffer[index]);
+ dev->config.if_desc[ifno].no_of_ep = 0;
+ dev->config.if_desc[ifno].num_altsetting = 1;
+ curr_if_num =
+ dev->config.if_desc[ifno].bInterfaceNumber;
+ } else {
+ /* found alternate setting for the interface */
+ dev->config.if_desc[ifno].num_altsetting++;
+ }
+ break;
+ case USB_DT_ENDPOINT:
+ epno = dev->config.if_desc[ifno].no_of_ep;
+ /* found an endpoint */
+ dev->config.if_desc[ifno].no_of_ep++;
+ memcpy(&dev->config.if_desc[ifno].ep_desc[epno],
+ &buffer[index], buffer[index]);
+ le16_to_cpus(&(dev->config.if_desc[ifno].ep_desc[epno].\
+ wMaxPacketSize));
+ USB_PRINTF("if %d, ep %d\n", ifno, epno);
+ break;
+ default:
+ if (head->bLength == 0)
+ return 1;
+
+ USB_PRINTF("unknown Description Type : %x\n",
+ head->bDescriptorType);
+
+ {
+ ch = (unsigned char *)head;
+ for (i = 0; i < head->bLength; i++)
+ USB_PRINTF("%02X ", *ch++);
+ USB_PRINTF("\n\n\n");
+ }
+ break;
+ }
+ index += head->bLength;
+ head = (struct usb_descriptor_header *)&buffer[index];
+ }
+ return 1;
+}
+
+/**
+ * set address of a device to the value in dev->devnum.
+ * This can only be done by addressing the device via the default address (0)
+ */
+static int usb_set_address(struct usb_device *dev)
+{
+ int res;
+
+ USB_PRINTF("set address %d\n", dev->devnum);
+ res = usb_control_msg(dev, usb_snddefctrl(dev),
+ USB_REQ_SET_ADDRESS, 0,
+ (dev->devnum), 0,
+ NULL, 0, USB_CNTL_TIMEOUT);
+ return res;
+}
+
+static int usb_get_descriptor(struct usb_device *dev, unsigned char type,
+ unsigned char index, void *buf, int size)
+{
+ int res;
+ res = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
+ USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
+ (type << 8) + index, 0,
+ buf, size, USB_CNTL_TIMEOUT);
+ return res;
+}
+
+/*
+ * By the time we get here, the device has gotten a new device ID
+ * and is in the default state. We need to identify the thing and
+ * get the ball rolling..
+ *
+ * Returns 0 for success, != 0 for error.
+ */
+static int usb_new_device(struct usb_device *dev)
+{
+ int addr, err;
+ int tmp;
+ unsigned char tmpbuf[USB_BUFSIZ];
+ struct usb_device_descriptor *desc;
+ int port = -1;
+ struct usb_device *parent = dev->parent;
+ unsigned short portstatus;
+
+ /* We still haven't set the Address yet */
+ addr = dev->devnum;
+ dev->devnum = 0;
+
+ /* This is a Windows scheme of initialization sequence, with double
+ * reset of the device (Linux uses the same sequence)
+ * Some equipment is said to work only with such init sequence; this
+ * patch is based on the work by Alan Stern:
+ * http://sourceforge.net/mailarchive/forum.php?
+ * thread_id=5729457&forum_id=5398
+ */
+
+ /* send 64-byte GET-DEVICE-DESCRIPTOR request. Since the descriptor is
+ * only 18 bytes long, this will terminate with a short packet. But if
+ * the maxpacket size is 8 or 16 the device may be waiting to transmit
+ * some more, or keeps on retransmitting the 8 byte header. */
+
+ desc = (struct usb_device_descriptor *)tmpbuf;
+ dev->descriptor.bMaxPacketSize0 = 64; /* Start off at 64 bytes */
+ /* Default to 64 byte max packet size */
+ dev->maxpacketsize = PACKET_SIZE_64;
+ dev->epmaxpacketin[0] = 64;
+ dev->epmaxpacketout[0] = 64;
+
+ err = usb_get_descriptor(dev, USB_DT_DEVICE, 0, desc, 64);
+ if (err < 0) {
+ USB_PRINTF("%s: usb_get_descriptor() failed with %d\n", __func__, err);
+ return 1;
+ }
+
+ dev->descriptor.bMaxPacketSize0 = desc->bMaxPacketSize0;
+
+ /* find the port number we're at */
+ if (parent) {
+ int j;
+
+ for (j = 0; j < parent->maxchild; j++) {
+ if (parent->children[j] == dev) {
+ port = j;
+ break;
+ }
+ }
+ if (port < 0) {
+ printf("%s: cannot locate device's port.\n", __func__);
+ return 1;
+ }
+
+ /* reset the port for the second time */
+ err = hub_port_reset(dev->parent, port, &portstatus);
+ if (err < 0) {
+ printf("\n Couldn't reset port %i\n", port);
+ return 1;
+ }
+ }
+
+ dev->epmaxpacketin[0] = dev->descriptor.bMaxPacketSize0;
+ dev->epmaxpacketout[0] = dev->descriptor.bMaxPacketSize0;
+ switch (dev->descriptor.bMaxPacketSize0) {
+ case 8:
+ dev->maxpacketsize = PACKET_SIZE_8;
+ break;
+ case 16:
+ dev->maxpacketsize = PACKET_SIZE_16;
+ break;
+ case 32:
+ dev->maxpacketsize = PACKET_SIZE_32;
+ break;
+ case 64:
+ dev->maxpacketsize = PACKET_SIZE_64;
+ break;
+ }
+ dev->devnum = addr;
+
+ err = usb_set_address(dev); /* set address */
+
+ if (err < 0) {
+ printf("\n USB device not accepting new address " \
+ "(error=%lX)\n", dev->status);
+ return 1;
+ }
+
+ wait_ms(10); /* Let the SET_ADDRESS settle */
+
+ tmp = sizeof(dev->descriptor);
+
+ err = usb_get_descriptor(dev, USB_DT_DEVICE, 0,
+ &dev->descriptor, sizeof(dev->descriptor));
+ if (err < tmp) {
+ if (err < 0)
+ printf("unable to get device descriptor (error=%d)\n",
+ err);
+ else
+ printf("USB device descriptor short read " \
+ "(expected %i, got %i)\n", tmp, err);
+ return 1;
+ }
+ /* correct le values */
+ le16_to_cpus(&dev->descriptor.bcdUSB);
+ le16_to_cpus(&dev->descriptor.idVendor);
+ le16_to_cpus(&dev->descriptor.idProduct);
+ le16_to_cpus(&dev->descriptor.bcdDevice);
+ /* only support for one config for now */
+ usb_get_configuration_no(dev, &tmpbuf[0], 0);
+ usb_parse_config(dev, &tmpbuf[0], 0);
+ usb_set_maxpacket(dev);
+ /* we set the default configuration here */
+ if (usb_set_configuration(dev, dev->config.bConfigurationValue)) {
+ printf("failed to set default configuration " \
+ "len %d, status %lX\n", dev->act_len, dev->status);
+ return -1;
+ }
+ USB_PRINTF("new device: Mfr=%d, Product=%d, SerialNumber=%d\n",
+ dev->descriptor.iManufacturer, dev->descriptor.iProduct,
+ dev->descriptor.iSerialNumber);
+ memset(dev->mf, 0, sizeof(dev->mf));
+ memset(dev->prod, 0, sizeof(dev->prod));
+ memset(dev->serial, 0, sizeof(dev->serial));
+ if (dev->descriptor.iManufacturer)
+ usb_string(dev, dev->descriptor.iManufacturer,
+ dev->mf, sizeof(dev->mf));
+ if (dev->descriptor.iProduct)
+ usb_string(dev, dev->descriptor.iProduct,
+ dev->prod, sizeof(dev->prod));
+ if (dev->descriptor.iSerialNumber)
+ usb_string(dev, dev->descriptor.iSerialNumber,
+ dev->serial, sizeof(dev->serial));
+ /* now prode if the device is a hub */
+ usb_hub_probe(dev, 0);
+
+ sprintf(dev->dev.name, "usb%d-%d", dev->host->busnum, dev->devnum);
+
+ print_usb_device(dev);
+
+ register_device(&dev->dev);
+ list_add_tail(&dev->list, &usb_device_list);
+
+ return 0;
+}
+
+static struct usb_device *usb_alloc_new_device(void)
+{
+ struct usb_device *usbdev = xzalloc(sizeof (*usbdev));
+
+ if (!usbdev)
+ return NULL;
+
+ usbdev->devnum = dev_index + 1;
+ usbdev->maxchild = 0;
+ usbdev->dev.bus = &usb_bus_type;
+
+ dev_index++;
+
+ return usbdev;
+}
+
+static int __usb_init(void)
+{
+ struct usb_device *dev, *tmp;
+ struct usb_host *host;
+ int ret;
+
+ list_for_each_entry_safe(dev, tmp, &usb_device_list, list) {
+ list_del(&dev->list);
+ unregister_device(&dev->dev);
+ if (dev->hub)
+ free(dev->hub);
+ free(dev);
+ }
+
+ printf("USB: scanning bus for devices...\n");
+ dev_index = 0;
+
+ list_for_each_entry(host, &host_list, list) {
+ ret = host->init(host);
+ if (ret)
+ continue;
+
+ dev = usb_alloc_new_device();
+ dev->host = host;
+ usb_new_device(dev);
+ }
+
+ printf("%d USB Device(s) found\n", dev_index);
+
+ return 0;
+}
+
+static int do_usb(struct command *cmdtp, int argc, char *argv[])
+{
+ __usb_init();
+
+ return 0;
+}
+
+static const __maybe_unused char cmd_usb_help[] =
+"Usage: usb\n"
+"(re-)detect USB devices\n";
+
+BAREBOX_CMD_START(usb)
+ .cmd = do_usb,
+ .usage = "(re-)detect USB devices",
+ BAREBOX_CMD_HELP(cmd_usb_help)
+BAREBOX_CMD_END
+
+/*
+ * disables the asynch behaviour of the control message. This is used for data
+ * transfers that uses the exclusiv access to the control and bulk messages.
+ */
+void usb_disable_asynch(int disable)
+{
+ asynch_allowed = !disable;
+}
+
+
+/*-------------------------------------------------------------------
+ * Message wrappers.
+ *
+ */
+
+/*
+ * submits an Interrupt Message
+ */
+int usb_submit_int_msg(struct usb_device *dev, unsigned long pipe,
+ void *buffer, int transfer_len, int interval)
+{
+ struct usb_host *host = dev->host;
+
+ return host->submit_int_msg(dev, pipe, buffer, transfer_len, interval);
+}
+
+/*
+ * submits a control message and waits for comletion (at least timeout * 1ms)
+ * If timeout is 0, we don't wait for completion (used as example to set and
+ * clear keyboards LEDs). For data transfers, (storage transfers) we don't
+ * allow control messages with 0 timeout, by previousely resetting the flag
+ * asynch_allowed (usb_disable_asynch(1)).
+ * returns the transfered length if OK or -1 if error. The transfered length
+ * and the current status are stored in the dev->act_len and dev->status.
+ */
+int usb_control_msg(struct usb_device *dev, unsigned int pipe,
+ unsigned char request, unsigned char requesttype,
+ unsigned short value, unsigned short index,
+ void *data, unsigned short size, int timeout)
+{
+ struct usb_host *host = dev->host;
+
+ if ((timeout == 0) && (!asynch_allowed)) {
+ /* request for a asynch control pipe is not allowed */
+ return -1;
+ }
+
+ /* set setup command */
+ setup_packet.requesttype = requesttype;
+ setup_packet.request = request;
+ setup_packet.value = cpu_to_le16(value);
+ setup_packet.index = cpu_to_le16(index);
+ setup_packet.length = cpu_to_le16(size);
+ USB_PRINTF("usb_control_msg: request: 0x%X, requesttype: 0x%X, " \
+ "value 0x%X index 0x%X length 0x%X\n",
+ request, requesttype, value, index, size);
+ dev->status = USB_ST_NOT_PROC; /*not yet processed */
+
+ host->submit_control_msg(dev, pipe, data, size, &setup_packet);
+ if (timeout == 0)
+ return (int)size;
+
+ if (dev->status != 0) {
+ /*
+ * Let's wait a while for the timeout to elapse.
+ * It has no real use, but it keeps the interface happy.
+ */
+ wait_ms(timeout);
+ return -1;
+ }
+
+ return dev->act_len;
+}
+
+/*-------------------------------------------------------------------
+ * submits bulk message, and waits for completion. returns 0 if Ok or
+ * -1 if Error.
+ * synchronous behavior
+ */
+int usb_bulk_msg(struct usb_device *dev, unsigned int pipe,
+ void *data, int len, int *actual_length, int timeout)
+{
+ struct usb_host *host = dev->host;
+ int ret;
+
+ if (len < 0)
+ return -1;
+
+ dev->status = USB_ST_NOT_PROC; /* not yet processed */
+ ret = host->submit_bulk_msg(dev, pipe, data, len);
+ if (ret)
+ return ret;
+
+ *actual_length = dev->act_len;
+
+ return (dev->status == 0) ? 0 : -1;
+}
+
+
+/*-------------------------------------------------------------------
+ * Max Packet stuff
+ */
+
+/*
+ * returns the max packet size, depending on the pipe direction and
+ * the configurations values
+ */
+int usb_maxpacket(struct usb_device *dev, unsigned long pipe)
+{
+ /* direction is out -> use emaxpacket out */
+ if ((pipe & USB_DIR_IN) == 0)
+ return dev->epmaxpacketout[((pipe>>15) & 0xf)];
+ else
+ return dev->epmaxpacketin[((pipe>>15) & 0xf)];
+}
+
+/***********************************************************************
+ * Clears an endpoint
+ * endp: endpoint number in bits 0-3;
+ * direction flag in bit 7 (1 = IN, 0 = OUT)
+ */
+int usb_clear_halt(struct usb_device *dev, int pipe)
+{
+ int result;
+ int endp = usb_pipeendpoint(pipe)|(usb_pipein(pipe)<<7);
+
+ result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
+ USB_REQ_CLEAR_FEATURE, USB_RECIP_ENDPOINT, 0,
+ endp, NULL, 0, USB_CNTL_TIMEOUT * 3);
+
+ /* don't clear if failed */
+ if (result < 0)
+ return result;
+
+ /*
+ * NOTE: we do not get status and verify reset was successful
+ * as some devices are reported to lock up upon this check..
+ */
+
+ usb_endpoint_running(dev, usb_pipeendpoint(pipe), usb_pipeout(pipe));
+
+ /* toggle is reset on clear */
+ usb_settoggle(dev, usb_pipeendpoint(pipe), usb_pipeout(pipe), 0);
+ return 0;
+}
+
+/**********************************************************************
+ * gets configuration cfgno and store it in the buffer
+ */
+int usb_get_configuration_no(struct usb_device *dev,
+ unsigned char *buffer, int cfgno)
+{
+ int result;
+ unsigned int tmp;
+ struct usb_config_descriptor *config;
+
+
+ config = (struct usb_config_descriptor *)&buffer[0];
+ result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno, buffer, 9);
+ if (result < 9) {
+ if (result < 0)
+ printf("unable to get descriptor, error %lX\n",
+ dev->status);
+ else
+ printf("config descriptor too short " \
+ "(expected %i, got %i)\n", 9, result);
+ return -1;
+ }
+ tmp = le16_to_cpu(config->wTotalLength);
+
+ if (tmp > USB_BUFSIZ) {
+ USB_PRINTF("usb_get_configuration_no: failed to get " \
+ "descriptor - too long: %d\n", tmp);
+ return -1;
+ }
+
+ result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno, buffer, tmp);
+ USB_PRINTF("get_conf_no %d Result %d, wLength %d\n",
+ cfgno, result, tmp);
+ return result;
+}
+
+/********************************************************************
+ * set interface number to interface
+ */
+int usb_set_interface(struct usb_device *dev, int interface, int alternate)
+{
+ struct usb_interface_descriptor *if_face = NULL;
+ int ret, i;
+
+ for (i = 0; i < dev->config.bNumInterfaces; i++) {
+ if (dev->config.if_desc[i].bInterfaceNumber == interface) {
+ if_face = &dev->config.if_desc[i];
+ break;
+ }
+ }
+ if (!if_face) {
+ printf("selecting invalid interface %d", interface);
+ return -1;
+ }
+ /*
+ * We should return now for devices with only one alternate setting.
+ * According to 9.4.10 of the Universal Serial Bus Specification
+ * Revision 2.0 such devices can return with a STALL. This results in
+ * some USB sticks timeouting during initialization and then being
+ * unusable in barebox.
+ */
+ if (if_face->num_altsetting == 1)
+ return 0;
+
+ ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
+ USB_REQ_SET_INTERFACE, USB_RECIP_INTERFACE,
+ alternate, interface, NULL, 0,
+ USB_CNTL_TIMEOUT * 5);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+/********************************************************************
+ * set protocol to protocol
+ */
+int usb_set_protocol(struct usb_device *dev, int ifnum, int protocol)
+{
+ return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
+ USB_REQ_SET_PROTOCOL, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
+ protocol, ifnum, NULL, 0, USB_CNTL_TIMEOUT);
+}
+
+/********************************************************************
+ * set idle
+ */
+int usb_set_idle(struct usb_device *dev, int ifnum, int duration, int report_id)
+{
+ return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
+ USB_REQ_SET_IDLE, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
+ (duration << 8) | report_id, ifnum, NULL, 0, USB_CNTL_TIMEOUT);
+}
+
+/********************************************************************
+ * get report
+ */
+int usb_get_report(struct usb_device *dev, int ifnum, unsigned char type,
+ unsigned char id, void *buf, int size)
+{
+ return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
+ USB_REQ_GET_REPORT,
+ USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
+ (type << 8) + id, ifnum, buf, size, USB_CNTL_TIMEOUT);
+}
+
+/********************************************************************
+ * get class descriptor
+ */
+int usb_get_class_descriptor(struct usb_device *dev, int ifnum,
+ unsigned char type, unsigned char id, void *buf, int size)
+{
+ return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
+ USB_REQ_GET_DESCRIPTOR, USB_RECIP_INTERFACE | USB_DIR_IN,
+ (type << 8) + id, ifnum, buf, size, USB_CNTL_TIMEOUT);
+}
+
+/********************************************************************
+ * get string index in buffer
+ */
+int usb_get_string(struct usb_device *dev, unsigned short langid,
+ unsigned char index, void *buf, int size)
+{
+ int i;
+ int result;
+
+ for (i = 0; i < 3; ++i) {
+ /* some devices are flaky */
+ result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
+ USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
+ (USB_DT_STRING << 8) + index, langid, buf, size,
+ USB_CNTL_TIMEOUT);
+
+ if (result > 0)
+ break;
+ }
+
+ return result;
+}
+
+
+static void usb_try_string_workarounds(unsigned char *buf, int *length)
+{
+ int newlength, oldlength = *length;
+
+ for (newlength = 2; newlength + 1 < oldlength; newlength += 2)
+ if (!isprint(buf[newlength]) || buf[newlength + 1])
+ break;
+
+ if (newlength > 2) {
+ buf[0] = newlength;
+ *length = newlength;
+ }
+}
+
+
+static int usb_string_sub(struct usb_device *dev, unsigned int langid,
+ unsigned int index, unsigned char *buf)
+{
+ int rc;
+
+ /* Try to read the string descriptor by asking for the maximum
+ * possible number of bytes */
+ rc = usb_get_string(dev, langid, index, buf, 255);
+
+ /* If that failed try to read the descriptor length, then
+ * ask for just that many bytes */
+ if (rc < 2) {
+ rc = usb_get_string(dev, langid, index, buf, 2);
+ if (rc == 2)
+ rc = usb_get_string(dev, langid, index, buf, buf[0]);
+ }
+
+ if (rc >= 2) {
+ if (!buf[0] && !buf[1])
+ usb_try_string_workarounds(buf, &rc);
+
+ /* There might be extra junk at the end of the descriptor */
+ if (buf[0] < rc)
+ rc = buf[0];
+
+ rc = rc - (rc & 1); /* force a multiple of two */
+ }
+
+ if (rc < 2)
+ rc = -1;
+
+ return rc;
+}
+
+
+/********************************************************************
+ * usb_string:
+ * Get string index and translate it to ascii.
+ * returns string length (> 0) or error (< 0)
+ */
+int usb_string(struct usb_device *dev, int index, char *buf, size_t size)
+{
+ unsigned char mybuf[USB_BUFSIZ];
+ unsigned char *tbuf;
+ int err;
+ unsigned int u, idx;
+
+ if (size <= 0 || !buf || !index)
+ return -1;
+ buf[0] = 0;
+ tbuf = &mybuf[0];
+
+ /* get langid for strings if it's not yet known */
+ if (!dev->have_langid) {
+ err = usb_string_sub(dev, 0, 0, tbuf);
+ if (err < 0) {
+ USB_PRINTF("error getting string descriptor 0 " \
+ "(error=%lx)\n", dev->status);
+ return -1;
+ } else if (tbuf[0] < 4) {
+ USB_PRINTF("string descriptor 0 too short\n");
+ return -1;
+ } else {
+ dev->have_langid = -1;
+ dev->string_langid = tbuf[2] | (tbuf[3] << 8);
+ /* always use the first langid listed */
+ USB_PRINTF("USB device number %d default " \
+ "language ID 0x%x\n",
+ dev->devnum, dev->string_langid);
+ }
+ }
+
+ err = usb_string_sub(dev, dev->string_langid, index, tbuf);
+ if (err < 0)
+ return err;
+
+ size--; /* leave room for trailing NULL char in output buffer */
+ for (idx = 0, u = 2; u < err; u += 2) {
+ if (idx >= size)
+ break;
+ if (tbuf[u+1]) /* high byte */
+ buf[idx++] = '?'; /* non-ASCII character */
+ else
+ buf[idx++] = tbuf[u];
+ }
+ buf[idx] = 0;
+ err = idx;
+ return err;
+}
+
+/****************************************************************************
+ * HUB "Driver"
+ * Probes device for being a hub and configurate it
+ */
+
+#undef USB_HUB_DEBUG
+
+#ifdef USB_HUB_DEBUG
+#define USB_HUB_PRINTF(fmt, args...) printf(fmt , ##args)
+#else
+#define USB_HUB_PRINTF(fmt, args...)
+#endif
+
+int usb_get_hub_descriptor(struct usb_device *dev, void *data, int size)
+{
+ return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
+ USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
+ USB_DT_HUB << 8, 0, data, size, USB_CNTL_TIMEOUT);
+}
+
+int usb_clear_hub_feature(struct usb_device *dev, int feature)
+{
+ return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
+ USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature,
+ 0, NULL, 0, USB_CNTL_TIMEOUT);
+}
+
+int usb_clear_port_feature(struct usb_device *dev, int port, int feature)
+{
+ return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
+ USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature,
+ port, NULL, 0, USB_CNTL_TIMEOUT);
+}
+
+int usb_set_port_feature(struct usb_device *dev, int port, int feature)
+{
+ return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
+ USB_REQ_SET_FEATURE, USB_RT_PORT, feature,
+ port, NULL, 0, USB_CNTL_TIMEOUT);
+}
+
+int usb_get_hub_status(struct usb_device *dev, void *data)
+{
+ return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
+ USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
+ data, sizeof(struct usb_hub_status), USB_CNTL_TIMEOUT);
+}
+
+int usb_get_port_status(struct usb_device *dev, int port, void *data)
+{
+ return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
+ USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port,
+ data, sizeof(struct usb_hub_status), USB_CNTL_TIMEOUT);
+}
+
+
+static void usb_hub_power_on(struct usb_hub_device *hub)
+{
+ int i;
+ struct usb_device *dev;
+
+ dev = hub->pusb_dev;
+ /* Enable power to the ports */
+ USB_HUB_PRINTF("enabling power on all ports\n");
+ for (i = 0; i < dev->maxchild; i++) {
+ usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
+ USB_HUB_PRINTF("port %d returns %lX\n", i + 1, dev->status);
+ wait_ms(hub->desc.bPwrOn2PwrGood * 2);
+ }
+}
+
+#define MAX_TRIES 5
+
+static inline char *portspeed(int portstatus)
+{
+ if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED))
+ return "480 Mb/s";
+ else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED))
+ return "1.5 Mb/s";
+ else
+ return "12 Mb/s";
+}
+
+static int hub_port_reset(struct usb_device *dev, int port,
+ unsigned short *portstat)
+{
+ int tries;
+ struct usb_port_status portsts;
+ unsigned short portstatus, portchange;
+
+ USB_HUB_PRINTF("hub_port_reset: resetting port %d...\n", port);
+ for (tries = 0; tries < MAX_TRIES; tries++) {
+
+ usb_set_port_feature(dev, port + 1, USB_PORT_FEAT_RESET);
+ wait_ms(200);
+
+ if (usb_get_port_status(dev, port + 1, &portsts) < 0) {
+ USB_HUB_PRINTF("get_port_status failed status %lX\n",
+ dev->status);
+ return -1;
+ }
+ portstatus = le16_to_cpu(portsts.wPortStatus);
+ portchange = le16_to_cpu(portsts.wPortChange);
+
+ USB_HUB_PRINTF("portstatus %x, change %x, %s\n",
+ portstatus, portchange,
+ portspeed(portstatus));
+
+ USB_HUB_PRINTF("STAT_C_CONNECTION = %d STAT_CONNECTION = %d" \
+ " USB_PORT_STAT_ENABLE %d\n",
+ (portchange & USB_PORT_STAT_C_CONNECTION) ? 1 : 0,
+ (portstatus & USB_PORT_STAT_CONNECTION) ? 1 : 0,
+ (portstatus & USB_PORT_STAT_ENABLE) ? 1 : 0);
+
+ if ((portchange & USB_PORT_STAT_C_CONNECTION) ||
+ !(portstatus & USB_PORT_STAT_CONNECTION))
+ return -1;
+
+ if (portstatus & USB_PORT_STAT_ENABLE)
+ break;
+
+ wait_ms(200);
+ }
+
+ if (tries == MAX_TRIES) {
+ USB_HUB_PRINTF("Cannot enable port %i after %i retries, " \
+ "disabling port.\n", port + 1, MAX_TRIES);
+ USB_HUB_PRINTF("Maybe the USB cable is bad?\n");
+ return -1;
+ }
+
+ usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_RESET);
+ *portstat = portstatus;
+ return 0;
+}
+
+
+static void usb_hub_port_connect_change(struct usb_device *dev, int port)
+{
+ struct usb_device *usb;
+ struct usb_port_status portsts;
+ unsigned short portstatus, portchange;
+
+ /* Check status */
+ if (usb_get_port_status(dev, port + 1, &portsts) < 0) {
+ USB_HUB_PRINTF("get_port_status failed\n");
+ return;
+ }
+
+ portstatus = le16_to_cpu(portsts.wPortStatus);
+ portchange = le16_to_cpu(portsts.wPortChange);
+ USB_HUB_PRINTF("portstatus %x, change %x, %s\n",
+ portstatus, portchange, portspeed(portstatus));
+
+ /* Clear the connection change status */
+ usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_CONNECTION);
+
+ /* Disconnect any existing devices under this port */
+ if (((!(portstatus & USB_PORT_STAT_CONNECTION)) &&
+ (!(portstatus & USB_PORT_STAT_ENABLE))) || (dev->children[port])) {
+ USB_HUB_PRINTF("usb_disconnect(&hub->children[port]);\n");
+ /* Return now if nothing is connected */
+ if (!(portstatus & USB_PORT_STAT_CONNECTION))
+ return;
+ }
+ wait_ms(200);
+
+ /* Reset the port */
+ if (hub_port_reset(dev, port, &portstatus) < 0) {
+ printf("cannot reset port %i!?\n", port + 1);
+ return;
+ }
+
+ wait_ms(200);
+
+ /* Allocate a new device struct for it */
+ usb = usb_alloc_new_device();
+ usb->host = dev->host;
+
+ if (portstatus & USB_PORT_STAT_HIGH_SPEED)
+ usb->speed = USB_SPEED_HIGH;
+ else if (portstatus & USB_PORT_STAT_LOW_SPEED)
+ usb->speed = USB_SPEED_LOW;
+ else
+ usb->speed = USB_SPEED_FULL;
+
+ dev->children[port] = usb;
+ usb->parent = dev;
+ /* Run it through the hoops (find a driver, etc) */
+ if (usb_new_device(usb)) {
+ /* Woops, disable the port */
+ USB_HUB_PRINTF("hub: disabling port %d\n", port + 1);
+ usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_ENABLE);
+ }
+}
+
+
+int usb_hub_configure(struct usb_device *dev)
+{
+ unsigned char buffer[USB_BUFSIZ], *bitmap;
+ struct usb_hub_descriptor *descriptor;
+ struct usb_hub_status *hubsts;
+ int i;
+ struct usb_hub_device *hub;
+
+ hub = xzalloc(sizeof (*hub));
+ dev->hub = hub;
+
+ hub->pusb_dev = dev;
+ /* Get the the hub descriptor */
+ if (usb_get_hub_descriptor(dev, buffer, 4) < 0) {
+ USB_HUB_PRINTF("%s: failed to get hub " \
+ "descriptor, giving up %lX\n", __func__, dev->status);
+ return -1;
+ }
+ descriptor = (struct usb_hub_descriptor *)buffer;
+
+ /* silence compiler warning if USB_BUFSIZ is > 256 [= sizeof(char)] */
+ i = descriptor->bLength;
+ if (i > USB_BUFSIZ) {
+ USB_HUB_PRINTF("%s: failed to get hub " \
+ "descriptor - too long: %d\n", __func__,
+ descriptor->bLength);
+ return -1;
+ }
+
+ if (usb_get_hub_descriptor(dev, buffer, descriptor->bLength) < 0) {
+ USB_HUB_PRINTF("%s: failed to get hub " \
+ "descriptor 2nd giving up %lX\n", __func__, dev->status);
+ return -1;
+ }
+ memcpy((unsigned char *)&hub->desc, buffer, descriptor->bLength);
+ /* adjust 16bit values */
+ hub->desc.wHubCharacteristics =
+ le16_to_cpu(descriptor->wHubCharacteristics);
+ /* set the bitmap */
+ bitmap = (unsigned char *)&hub->desc.DeviceRemovable[0];
+ /* devices not removable by default */
+ memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8);
+ bitmap = (unsigned char *)&hub->desc.PortPowerCtrlMask[0];
+ memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8); /* PowerMask = 1B */
+
+ for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
+ hub->desc.DeviceRemovable[i] = descriptor->DeviceRemovable[i];
+
+ for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
+ hub->desc.DeviceRemovable[i] = descriptor->PortPowerCtrlMask[i];
+
+ dev->maxchild = descriptor->bNbrPorts;
+ USB_HUB_PRINTF("%d ports detected\n", dev->maxchild);
+
+ switch (hub->desc.wHubCharacteristics & HUB_CHAR_LPSM) {
+ case 0x00:
+ USB_HUB_PRINTF("ganged power switching\n");
+ break;
+ case 0x01:
+ USB_HUB_PRINTF("individual port power switching\n");
+ break;
+ case 0x02:
+ case 0x03:
+ USB_HUB_PRINTF("unknown reserved power switching mode\n");
+ break;
+ }
+
+ if (hub->desc.wHubCharacteristics & HUB_CHAR_COMPOUND)
+ USB_HUB_PRINTF("part of a compound device\n");
+ else
+ USB_HUB_PRINTF("standalone hub\n");
+
+ switch (hub->desc.wHubCharacteristics & HUB_CHAR_OCPM) {
+ case 0x00:
+ USB_HUB_PRINTF("global over-current protection\n");
+ break;
+ case 0x08:
+ USB_HUB_PRINTF("individual port over-current protection\n");
+ break;
+ case 0x10:
+ case 0x18:
+ USB_HUB_PRINTF("no over-current protection\n");
+ break;
+ }
+
+ USB_HUB_PRINTF("power on to power good time: %dms\n",
+ descriptor->bPwrOn2PwrGood * 2);
+ USB_HUB_PRINTF("hub controller current requirement: %dmA\n",
+ descriptor->bHubContrCurrent);
+
+ for (i = 0; i < dev->maxchild; i++)
+ USB_HUB_PRINTF("port %d is%s removable\n", i + 1,
+ hub->desc.DeviceRemovable[(i + 1) / 8] & \
+ (1 << ((i + 1) % 8)) ? " not" : "");
+
+ if (sizeof(struct usb_hub_status) > USB_BUFSIZ) {
+ USB_HUB_PRINTF("%s: failed to get Status - " \
+ "too long: %d\n", __func__, descriptor->bLength);
+ return -1;
+ }
+
+ if (usb_get_hub_status(dev, buffer) < 0) {
+ USB_HUB_PRINTF("%s: failed to get Status %lX\n", __func__,
+ dev->status);
+ return -1;
+ }
+
+ hubsts = (struct usb_hub_status *)buffer;
+ USB_HUB_PRINTF("get_hub_status returned status %X, change %X\n",
+ le16_to_cpu(hubsts->wHubStatus),
+ le16_to_cpu(hubsts->wHubChange));
+ USB_HUB_PRINTF("local power source is %s\n",
+ (le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_LOCAL_POWER) ? \
+ "lost (inactive)" : "good");
+ USB_HUB_PRINTF("%sover-current condition exists\n",
+ (le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_OVERCURRENT) ? \
+ "" : "no ");
+ usb_hub_power_on(hub);
+
+ for (i = 0; i < dev->maxchild; i++) {
+ struct usb_port_status portsts;
+ unsigned short portstatus, portchange;
+
+ if (usb_get_port_status(dev, i + 1, &portsts) < 0) {
+ USB_HUB_PRINTF("get_port_status failed\n");
+ continue;
+ }
+
+ portstatus = le16_to_cpu(portsts.wPortStatus);
+ portchange = le16_to_cpu(portsts.wPortChange);
+ USB_HUB_PRINTF("Port %d Status %X Change %X\n",
+ i + 1, portstatus, portchange);
+
+ if (portchange & USB_PORT_STAT_C_CONNECTION) {
+ USB_HUB_PRINTF("port %d connection change\n", i + 1);
+ usb_hub_port_connect_change(dev, i);
+ }
+ if (portchange & USB_PORT_STAT_C_ENABLE) {
+ USB_HUB_PRINTF("port %d enable change, status %x\n",
+ i + 1, portstatus);
+ usb_clear_port_feature(dev, i + 1,
+ USB_PORT_FEAT_C_ENABLE);
+
+ /* EM interference sometimes causes bad shielded USB
+ * devices to be shutdown by the hub, this hack enables
+ * them again. Works at least with mouse driver */
+ if (!(portstatus & USB_PORT_STAT_ENABLE) &&
+ (portstatus & USB_PORT_STAT_CONNECTION) &&
+ ((dev->children[i]))) {
+ USB_HUB_PRINTF("already running port %i " \
+ "disabled by hub (EMI?), " \
+ "re-enabling...\n", i + 1);
+ usb_hub_port_connect_change(dev, i);
+ }
+ }
+ if (portstatus & USB_PORT_STAT_SUSPEND) {
+ USB_HUB_PRINTF("port %d suspend change\n", i + 1);
+ usb_clear_port_feature(dev, i + 1,
+ USB_PORT_FEAT_SUSPEND);
+ }
+
+ if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
+ USB_HUB_PRINTF("port %d over-current change\n", i + 1);
+ usb_clear_port_feature(dev, i + 1,
+ USB_PORT_FEAT_C_OVER_CURRENT);
+ usb_hub_power_on(hub);
+ }
+
+ if (portchange & USB_PORT_STAT_C_RESET) {
+ USB_HUB_PRINTF("port %d reset change\n", i + 1);
+ usb_clear_port_feature(dev, i + 1,
+ USB_PORT_FEAT_C_RESET);
+ }
+ } /* end for i all ports */
+
+ return 0;
+}
+
+static int usb_hub_probe(struct usb_device *dev, int ifnum)
+{
+ struct usb_interface_descriptor *iface;
+ struct usb_endpoint_descriptor *ep;
+ int ret;
+
+ iface = &dev->config.if_desc[ifnum];
+ /* Is it a hub? */
+ if (iface->bInterfaceClass != USB_CLASS_HUB)
+ return 0;
+ /* Some hubs have a subclass of 1, which AFAICT according to the */
+ /* specs is not defined, but it works */
+ if ((iface->bInterfaceSubClass != 0) &&
+ (iface->bInterfaceSubClass != 1))
+ return 0;
+ /* Multiple endpoints? What kind of mutant ninja-hub is this? */
+ if (iface->bNumEndpoints != 1)
+ return 0;
+ ep = &iface->ep_desc[0];
+ /* Output endpoint? Curiousier and curiousier.. */
+ if (!(ep->bEndpointAddress & USB_DIR_IN))
+ return 0;
+ /* If it's not an interrupt endpoint, we'd better punt! */
+ if ((ep->bmAttributes & 3) != 3)
+ return 0;
+ /* We found a hub */
+ USB_HUB_PRINTF("USB hub found\n");
+ ret = usb_hub_configure(dev);
+ return ret;
+}
+
+int usb_driver_register(struct usb_driver *drv)
+{
+ drv->driver.bus = &usb_bus_type;
+ return register_driver(&drv->driver);
+}
+
+/* returns 0 if no match, 1 if match */
+int usb_match_device(struct usb_device *dev, const struct usb_device_id *id)
+{
+ if ((id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) &&
+ id->idVendor != le16_to_cpu(dev->descriptor.idVendor))
+ return 0;
+
+ if ((id->match_flags & USB_DEVICE_ID_MATCH_PRODUCT) &&
+ id->idProduct != le16_to_cpu(dev->descriptor.idProduct))
+ return 0;
+
+ return 1;
+}
+
+/* returns 0 if no match, 1 if match */
+int usb_match_one_id(struct usb_device *usbdev,
+ const struct usb_device_id *id)
+{
+ /* proc_connectinfo in devio.c may call us with id == NULL. */
+ if (id == NULL)
+ return 0;
+
+ if (!usb_match_device(usbdev, id))
+ return 0;
+
+ return 1;
+}
+EXPORT_SYMBOL(usb_match_one_id);
+
+const struct usb_device_id *usb_match_id(struct usb_device *usbdev,
+ const struct usb_device_id *id)
+{
+ /* proc_connectinfo in devio.c may call us with id == NULL. */
+ if (id == NULL)
+ return NULL;
+
+ /* It is important to check that id->driver_info is nonzero,
+ since an entry that is all zeroes except for a nonzero
+ id->driver_info is the way to create an entry that
+ indicates that the driver want to examine every
+ device and interface. */
+ for (; id->idVendor || id->idProduct || id->bDeviceClass ||
+ id->bInterfaceClass || id->driver_info; id++) {
+ if (usb_match_one_id(usbdev, id))
+ return id;
+ }
+
+ return NULL;
+}
+EXPORT_SYMBOL(usb_match_id);
+
+static int usb_match(struct device_d *dev, struct driver_d *drv)
+{
+ struct usb_device *usbdev = container_of(dev, struct usb_device, dev);
+ struct usb_driver *usbdrv = container_of(dev->driver, struct usb_driver, driver);
+ const struct usb_device_id *id;
+
+ debug("matching: 0x%04x 0x%04x\n", usbdev->descriptor.idVendor, usbdev->descriptor.idProduct);
+
+ id = usb_match_id(usbdev, usbdrv->id_table);
+ if (id) {
+ debug("match: 0x%04x 0x%04x\n", id->idVendor, id->idProduct);
+ return 0;
+ }
+ return 1;
+}
+
+static int usb_probe(struct device_d *dev)
+{
+ struct usb_device *usbdev = container_of(dev, struct usb_device, dev);
+ struct usb_driver *usbdrv = container_of(dev->driver, struct usb_driver, driver);
+ const struct usb_device_id *id;
+
+ id = usb_match_id(usbdev, usbdrv->id_table);
+
+ return usbdrv->probe(usbdev, id);
+}
+
+static void usb_remove(struct device_d *dev)
+{
+ struct usb_device *usbdev = container_of(dev, struct usb_device, dev);
+ struct usb_driver *usbdrv = container_of(dev->driver, struct usb_driver, driver);
+
+ usbdrv->disconnect(usbdev);
+}
+
+struct bus_type usb_bus_type = {
+ .name = "usb",
+ .match = usb_match,
+ .probe = usb_probe,
+ .remove = usb_remove,
+};
+