/* * * 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. * * */ /* * 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. */ #define pr_fmt(fmt) "usb: " fmt #include #include #include #include #include #include #include #include #include #include #include #include "usb.h" #include "hub.h" #define USB_BUFSIZ 512 static int dev_count; static int dev_index; static LIST_HEAD(host_list); LIST_HEAD(usb_device_list); static void print_usb_device(struct usb_device *dev) { pr_info("Bus %03d Device %03d: ID %04x:%04x %s\n", dev->host->busnum, dev->devnum, dev->descriptor->idVendor, dev->descriptor->idProduct, dev->prod); } static int host_busnum = 1; static inline int usb_host_acquire(struct usb_host *host) { if (host->sem) return -EAGAIN; host->sem++; return 0; } static inline void usb_host_release(struct usb_host *host) { if (host->sem > 0) host->sem--; } int usb_register_host(struct usb_host *host) { list_add_tail(&host->list, &host_list); host->busnum = host_busnum++; host->sem = 0; return 0; } void usb_unregister_host(struct usb_host *host) { list_del(&host->list); } /** * set configuration number to configuration */ static int usb_set_configuration(struct usb_device *dev, int configuration) { int res; pr_debug("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; pr_debug("##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; pr_debug("##EP epmaxpacketout[%d] = %d\n", b, dev->epmaxpacketout[b]); } } else { /* IN Endpoint */ if (ep->wMaxPacketSize > dev->epmaxpacketin[b]) { dev->epmaxpacketin[b] = ep->wMaxPacketSize; pr_debug("##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.desc.bNumInterfaces; i++) for (ii = 0; ii < dev->config.interface[i].desc.bNumEndpoints; ii++) usb_set_maxpacket_ep(dev, &dev->config.interface[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.desc.wTotalLength)); dev->config.no_of_if = 0; index = dev->config.desc.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.desc.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; /* if ifno > USB_MAXINTERFACES, then * next memcpy() will corrupt dev->config */ if (ifno > USB_MAXINTERFACES) { printf("ifno = %d > " "USB_MAXINTERFACES = %d !\n", ifno, USB_MAXINTERFACES); break; } dev->config.no_of_if++; memcpy(&dev->config.interface[ifno].desc, &buffer[index], buffer[index]); dev->config.interface[ifno].no_of_ep = 0; dev->config.interface[ifno].num_altsetting = 1; curr_if_num = dev->config.interface[ifno].desc.bInterfaceNumber; } else { /* found alternate setting for the interface */ dev->config.interface[ifno].num_altsetting++; } break; case USB_DT_ENDPOINT: epno = dev->config.interface[ifno].no_of_ep; /* found an endpoint */ dev->config.interface[ifno].no_of_ep++; memcpy(&dev->config.interface[ifno].ep_desc[epno], &buffer[index], buffer[index]); le16_to_cpus(&(dev->config.interface[ifno].ep_desc[epno].\ wMaxPacketSize)); pr_debug("if %d, ep %d\n", ifno, epno); break; default: if (head->bLength == 0) return 1; pr_debug("unknown Description Type : %x\n", head->bDescriptorType); { ch = (unsigned char *)head; for (i = 0; i < head->bLength; i++) pr_debug("%02X ", *ch++); pr_debug("\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; pr_debug("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. */ int usb_new_device(struct usb_device *dev) { int addr, err; int tmp; void *buf; struct usb_device_descriptor *desc; struct usb_device *parent = dev->parent; char str[16]; buf = dma_alloc(USB_BUFSIZ); /* 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 = buf; 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) { pr_debug("%s: usb_get_descriptor() failed with %d\n", __func__, err); goto err_out; } dev->descriptor->bMaxPacketSize0 = desc->bMaxPacketSize0; /* find the port number we're at */ if (parent) { /* reset the port for the second time */ err = hub_port_reset(dev->parent, dev->portnr - 1, dev); if (err < 0) { printf("\n Couldn't reset port %i\n", dev->portnr); goto err_out; } } 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); goto err_out; } mdelay(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); goto err_out; } /* 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, buf, 0); usb_parse_config(dev, buf, 0); usb_set_maxpacket(dev); /* we set the default configuration here */ if (usb_set_configuration(dev, dev->config.desc.bConfigurationValue)) { printf("failed to set default configuration " \ "len %d, status %lX\n", dev->act_len, dev->status); goto err_out; } pr_debug("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)); if (parent) { dev_set_name(&dev->dev, "%s-%d", parent->dev.name, dev->portnr - 1); } else { dev_set_name(&dev->dev, "usb%d", dev->host->busnum); } dev->dev.id = DEVICE_ID_SINGLE; print_usb_device(dev); err = register_device(&dev->dev); if (err) { printf("Failed to register device: %s\n", strerror(-err)); goto err_out; } dev_add_param_uint32_fixed(&dev->dev, "iManufacturer", dev->descriptor->iManufacturer, "%u"); dev_add_param_uint32_fixed(&dev->dev, "iProduct", dev->descriptor->iProduct, "%u"); dev_add_param_uint32_fixed(&dev->dev, "iSerialNumber", dev->descriptor->iSerialNumber, "%u"); dev_add_param_fixed(&dev->dev, "iSerialNumber", str); dev_add_param_fixed(&dev->dev, "Manufacturer", dev->mf); dev_add_param_fixed(&dev->dev, "Product", dev->prod); dev_add_param_fixed(&dev->dev, "SerialNumber", dev->serial); dev_add_param_uint32_fixed(&dev->dev, "idVendor", dev->descriptor->idVendor, "%04x"); dev_add_param_uint32_fixed(&dev->dev, "idProduct", dev->descriptor->idProduct, "%04x"); list_add_tail(&dev->list, &usb_device_list); dev_count++; err = 0; err_out: dma_free(buf); return err; } void usb_free_device(struct usb_device *usbdev) { dma_free(usbdev->descriptor); dma_free(usbdev->setup_packet); free(usbdev); } void usb_remove_device(struct usb_device *usbdev) { int i; if (!usbdev) return; for (i = 0; i < usbdev->maxchild; i++) usb_remove_device(usbdev->children[i]); if (usbdev->parent && usbdev->portnr) usbdev->parent->children[usbdev->portnr - 1] = NULL; list_del(&usbdev->list); dev_count--; if (unregister_device(&usbdev->dev)) dev_err(&usbdev->dev, "failed to unregister\n"); else dev_info(&usbdev->dev, "removed\n"); usb_free_device(usbdev); } struct usb_device *usb_alloc_new_device(void) { struct usb_device *usbdev = xzalloc(sizeof (*usbdev)); usbdev->devnum = ++dev_index; usbdev->maxchild = 0; usbdev->dev.bus = &usb_bus_type; usbdev->setup_packet = dma_alloc(sizeof(*usbdev->setup_packet)); usbdev->descriptor = dma_alloc(sizeof(*usbdev->descriptor)); return usbdev; } int usb_host_detect(struct usb_host *host) { int ret; if (!host->root_dev) { ret = host->init(host); if (ret) return ret; host->root_dev = usb_alloc_new_device(); host->root_dev->dev.parent = host->hw_dev; host->root_dev->host = host; ret = usb_new_device(host->root_dev); if (ret) { usb_free_device(host->root_dev); return ret; } } device_detect(&host->root_dev->dev); return 0; } void usb_rescan(void) { struct usb_host *host; int ret; pr_info("USB: scanning bus for devices...\n"); list_for_each_entry(host, &host_list, list) { ret = usb_host_detect(host); if (ret) continue; } pr_info("%d USB Device(s) found\n", dev_count); } /*------------------------------------------------------------------- * 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; int ret; ret = usb_host_acquire(host); if (ret) return ret; ret = host->submit_int_msg(dev, pipe, buffer, transfer_len, interval); usb_host_release(host); return ret; } /* * submits a control message and waits for completion (at least timeout * 1ms) * If timeout is 0, we don't wait for completion (used as example to set and * clear keyboards LEDs). * * 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; int ret; struct devrequest *setup_packet = dev->setup_packet; ret = usb_host_acquire(host); if (ret) return ret; /* 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); pr_debug("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 */ ret = host->submit_control_msg(dev, pipe, data, size, setup_packet, timeout); usb_host_release(host); if (ret) return ret; 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; ret = usb_host_acquire(host); if (ret) return ret; dev->status = USB_ST_NOT_PROC; /* not yet processed */ ret = host->submit_bulk_msg(dev, pipe, data, len, timeout); usb_host_release(host); 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); /* 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) { pr_debug("usb_get_configuration_no: failed to get " \ "descriptor - too long: %u\n", tmp); return -1; } result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno, buffer, tmp); pr_debug("get_conf_no %d Result %d, wLength %u\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 *if_face = NULL; int ret, i; for (i = 0; i < dev->config.desc.bNumInterfaces; i++) { if (dev->config.interface[i].desc.bInterfaceNumber == interface) { if_face = &dev->config.interface[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); 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 */ static 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) { pr_debug("error getting string descriptor 0 " \ "(error=%lx)\n", dev->status); return -1; } else if (tbuf[0] < 4) { pr_debug("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 */ pr_debug("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; } int usb_driver_register(struct usb_driver *drv) { drv->driver.name = drv->name; drv->driver.bus = &usb_bus_type; return register_driver(&drv->driver); } /* returns 0 if no match, 1 if match */ static 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 != dev->descriptor->idVendor) return 0; if ((id->match_flags & USB_DEVICE_ID_MATCH_PRODUCT) && id->idProduct != dev->descriptor->idProduct) return 0; return 1; } /* returns 0 if no match, 1 if match */ static int usb_match_one_id(struct usb_device *usbdev, const struct usb_device_id *id) { int ifno; /* proc_connectinfo in devio.c may call us with id == NULL. */ if (id == NULL) return 0; if (!usb_match_device(usbdev, id)) return 0; /* The interface class, subclass, and protocol should never be * checked for a match if the device class is Vendor Specific, * unless the match record specifies the Vendor ID. */ if (usbdev->descriptor->bDeviceClass == USB_CLASS_VENDOR_SPEC && !(id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) && (id->match_flags & USB_DEVICE_ID_MATCH_INT_INFO)) return 0; if ( (id->match_flags & USB_DEVICE_ID_MATCH_INT_INFO) ) { /* match any interface */ for (ifno=0; ifnoconfig.no_of_if; ifno++) { struct usb_interface_descriptor *intf; intf = &usbdev->config.interface[ifno].desc; if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_CLASS) && (id->bInterfaceClass != intf->bInterfaceClass)) continue; if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_SUBCLASS) && (id->bInterfaceSubClass != intf->bInterfaceSubClass)) continue; if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_PROTOCOL) && (id->bInterfaceProtocol != intf->bInterfaceProtocol)) continue; break; } if (ifno >= usbdev->config.no_of_if) return 0; } return 1; } EXPORT_SYMBOL(usb_match_one_id); static 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; pr_debug("matching: 0x%04x 0x%04x\n", usbdev->descriptor->idVendor, usbdev->descriptor->idProduct); id = usb_match_id(usbdev, usbdrv->id_table); if (id) { pr_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, }; static int usb_bus_init(void) { return bus_register(&usb_bus_type); } pure_initcall(usb_bus_init);