diff options
Diffstat (limited to 'drivers/usb/storage/usb.c')
| -rw-r--r-- | drivers/usb/storage/usb.c | 1051 |
1 files changed, 1051 insertions, 0 deletions
diff --git a/drivers/usb/storage/usb.c b/drivers/usb/storage/usb.c new file mode 100644 index 0000000..35c1ca6 --- /dev/null +++ b/drivers/usb/storage/usb.c @@ -0,0 +1,1051 @@ +/* Driver for USB Mass Storage compliant devices + * + * $Id: usb.c,v 1.75 2002/04/22 03:39:43 mdharm Exp $ + * + * Current development and maintenance by: + * (c) 1999-2003 Matthew Dharm (mdharm-usb@one-eyed-alien.net) + * + * Developed with the assistance of: + * (c) 2000 David L. Brown, Jr. (usb-storage@davidb.org) + * (c) 2003 Alan Stern (stern@rowland.harvard.edu) + * + * Initial work by: + * (c) 1999 Michael Gee (michael@linuxspecific.com) + * + * usb_device_id support by Adam J. Richter (adam@yggdrasil.com): + * (c) 2000 Yggdrasil Computing, Inc. + * + * This driver is based on the 'USB Mass Storage Class' document. This + * describes in detail the protocol used to communicate with such + * devices. Clearly, the designers had SCSI and ATAPI commands in + * mind when they created this document. The commands are all very + * similar to commands in the SCSI-II and ATAPI specifications. + * + * It is important to note that in a number of cases this class + * exhibits class-specific exemptions from the USB specification. + * Notably the usage of NAK, STALL and ACK differs from the norm, in + * that they are used to communicate wait, failed and OK on commands. + * + * Also, for certain devices, the interrupt endpoint is used to convey + * status of a command. + * + * Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more + * information about this driver. + * + * 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, 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> +#include <linux/sched.h> +#include <linux/errno.h> +#include <linux/suspend.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/slab.h> + +#include <scsi/scsi.h> +#include <scsi/scsi_cmnd.h> +#include <scsi/scsi_device.h> + +#include "usb.h" +#include "scsiglue.h" +#include "transport.h" +#include "protocol.h" +#include "debug.h" +#include "initializers.h" + +#ifdef CONFIG_USB_STORAGE_USBAT +#include "shuttle_usbat.h" +#endif +#ifdef CONFIG_USB_STORAGE_SDDR09 +#include "sddr09.h" +#endif +#ifdef CONFIG_USB_STORAGE_SDDR55 +#include "sddr55.h" +#endif +#ifdef CONFIG_USB_STORAGE_DPCM +#include "dpcm.h" +#endif +#ifdef CONFIG_USB_STORAGE_FREECOM +#include "freecom.h" +#endif +#ifdef CONFIG_USB_STORAGE_ISD200 +#include "isd200.h" +#endif +#ifdef CONFIG_USB_STORAGE_DATAFAB +#include "datafab.h" +#endif +#ifdef CONFIG_USB_STORAGE_JUMPSHOT +#include "jumpshot.h" +#endif + + +/* Some informational data */ +MODULE_AUTHOR("Matthew Dharm <mdharm-usb@one-eyed-alien.net>"); +MODULE_DESCRIPTION("USB Mass Storage driver for Linux"); +MODULE_LICENSE("GPL"); + +static unsigned int delay_use = 5; +module_param(delay_use, uint, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(delay_use, "seconds to delay before using a new device"); + + +/* These are used to make sure the module doesn't unload before all the + * threads have exited. + */ +static atomic_t total_threads = ATOMIC_INIT(0); +static DECLARE_COMPLETION(threads_gone); + + +static int storage_probe(struct usb_interface *iface, + const struct usb_device_id *id); + +static void storage_disconnect(struct usb_interface *iface); + +/* The entries in this table, except for final ones here + * (USB_MASS_STORAGE_CLASS and the empty entry), correspond, + * line for line with the entries of us_unsuaul_dev_list[]. + */ + +#define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \ + vendorName, productName,useProtocol, useTransport, \ + initFunction, flags) \ +{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin,bcdDeviceMax) } + +static struct usb_device_id storage_usb_ids [] = { + +# include "unusual_devs.h" +#undef UNUSUAL_DEV + /* Control/Bulk transport for all SubClass values */ + { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_RBC, US_PR_CB) }, + { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_8020, US_PR_CB) }, + { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_QIC, US_PR_CB) }, + { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_UFI, US_PR_CB) }, + { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_8070, US_PR_CB) }, + { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_SCSI, US_PR_CB) }, + + /* Control/Bulk/Interrupt transport for all SubClass values */ + { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_RBC, US_PR_CBI) }, + { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_8020, US_PR_CBI) }, + { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_QIC, US_PR_CBI) }, + { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_UFI, US_PR_CBI) }, + { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_8070, US_PR_CBI) }, + { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_SCSI, US_PR_CBI) }, + + /* Bulk-only transport for all SubClass values */ + { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_RBC, US_PR_BULK) }, + { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_8020, US_PR_BULK) }, + { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_QIC, US_PR_BULK) }, + { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_UFI, US_PR_BULK) }, + { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_8070, US_PR_BULK) }, + { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_SCSI, US_PR_BULK) }, + + /* Terminating entry */ + { } +}; + +MODULE_DEVICE_TABLE (usb, storage_usb_ids); + +/* This is the list of devices we recognize, along with their flag data */ + +/* The vendor name should be kept at eight characters or less, and + * the product name should be kept at 16 characters or less. If a device + * has the US_FL_FIX_INQUIRY flag, then the vendor and product names + * normally generated by a device thorugh the INQUIRY response will be + * taken from this list, and this is the reason for the above size + * restriction. However, if the flag is not present, then you + * are free to use as many characters as you like. + */ + +#undef UNUSUAL_DEV +#define UNUSUAL_DEV(idVendor, idProduct, bcdDeviceMin, bcdDeviceMax, \ + vendor_name, product_name, use_protocol, use_transport, \ + init_function, Flags) \ +{ \ + .vendorName = vendor_name, \ + .productName = product_name, \ + .useProtocol = use_protocol, \ + .useTransport = use_transport, \ + .initFunction = init_function, \ + .flags = Flags, \ +} + +static struct us_unusual_dev us_unusual_dev_list[] = { +# include "unusual_devs.h" +# undef UNUSUAL_DEV + /* Control/Bulk transport for all SubClass values */ + { .useProtocol = US_SC_RBC, + .useTransport = US_PR_CB}, + { .useProtocol = US_SC_8020, + .useTransport = US_PR_CB}, + { .useProtocol = US_SC_QIC, + .useTransport = US_PR_CB}, + { .useProtocol = US_SC_UFI, + .useTransport = US_PR_CB}, + { .useProtocol = US_SC_8070, + .useTransport = US_PR_CB}, + { .useProtocol = US_SC_SCSI, + .useTransport = US_PR_CB}, + + /* Control/Bulk/Interrupt transport for all SubClass values */ + { .useProtocol = US_SC_RBC, + .useTransport = US_PR_CBI}, + { .useProtocol = US_SC_8020, + .useTransport = US_PR_CBI}, + { .useProtocol = US_SC_QIC, + .useTransport = US_PR_CBI}, + { .useProtocol = US_SC_UFI, + .useTransport = US_PR_CBI}, + { .useProtocol = US_SC_8070, + .useTransport = US_PR_CBI}, + { .useProtocol = US_SC_SCSI, + .useTransport = US_PR_CBI}, + + /* Bulk-only transport for all SubClass values */ + { .useProtocol = US_SC_RBC, + .useTransport = US_PR_BULK}, + { .useProtocol = US_SC_8020, + .useTransport = US_PR_BULK}, + { .useProtocol = US_SC_QIC, + .useTransport = US_PR_BULK}, + { .useProtocol = US_SC_UFI, + .useTransport = US_PR_BULK}, + { .useProtocol = US_SC_8070, + .useTransport = US_PR_BULK}, + { .useProtocol = US_SC_SCSI, + .useTransport = US_PR_BULK}, + + /* Terminating entry */ + { NULL } +}; + +static struct usb_driver usb_storage_driver = { + .owner = THIS_MODULE, + .name = "usb-storage", + .probe = storage_probe, + .disconnect = storage_disconnect, + .id_table = storage_usb_ids, +}; + +/* + * fill_inquiry_response takes an unsigned char array (which must + * be at least 36 characters) and populates the vendor name, + * product name, and revision fields. Then the array is copied + * into the SCSI command's response buffer (oddly enough + * called request_buffer). data_len contains the length of the + * data array, which again must be at least 36. + */ + +void fill_inquiry_response(struct us_data *us, unsigned char *data, + unsigned int data_len) +{ + if (data_len<36) // You lose. + return; + + if(data[0]&0x20) { /* USB device currently not connected. Return + peripheral qualifier 001b ("...however, the + physical device is not currently connected + to this logical unit") and leave vendor and + product identification empty. ("If the target + does store some of the INQUIRY data on the + device, it may return zeros or ASCII spaces + (20h) in those fields until the data is + available from the device."). */ + memset(data+8,0,28); + } else { + u16 bcdDevice = le16_to_cpu(us->pusb_dev->descriptor.bcdDevice); + memcpy(data+8, us->unusual_dev->vendorName, + strlen(us->unusual_dev->vendorName) > 8 ? 8 : + strlen(us->unusual_dev->vendorName)); + memcpy(data+16, us->unusual_dev->productName, + strlen(us->unusual_dev->productName) > 16 ? 16 : + strlen(us->unusual_dev->productName)); + data[32] = 0x30 + ((bcdDevice>>12) & 0x0F); + data[33] = 0x30 + ((bcdDevice>>8) & 0x0F); + data[34] = 0x30 + ((bcdDevice>>4) & 0x0F); + data[35] = 0x30 + ((bcdDevice) & 0x0F); + } + + usb_stor_set_xfer_buf(data, data_len, us->srb); +} + +static int usb_stor_control_thread(void * __us) +{ + struct us_data *us = (struct us_data *)__us; + struct Scsi_Host *host = us_to_host(us); + + lock_kernel(); + + /* + * This thread doesn't need any user-level access, + * so get rid of all our resources. + */ + daemonize("usb-storage"); + current->flags |= PF_NOFREEZE; + unlock_kernel(); + + /* acquire a reference to the host, so it won't be deallocated + * until we're ready to exit */ + scsi_host_get(host); + + /* signal that we've started the thread */ + complete(&(us->notify)); + + for(;;) { + US_DEBUGP("*** thread sleeping.\n"); + if(down_interruptible(&us->sema)) + break; + + US_DEBUGP("*** thread awakened.\n"); + + /* lock the device pointers */ + down(&(us->dev_semaphore)); + + /* if the device has disconnected, we are free to exit */ + if (test_bit(US_FLIDX_DISCONNECTING, &us->flags)) { + US_DEBUGP("-- exiting\n"); + up(&(us->dev_semaphore)); + break; + } + + /* lock access to the state */ + scsi_lock(host); + + /* has the command timed out *already* ? */ + if (test_bit(US_FLIDX_TIMED_OUT, &us->flags)) { + us->srb->result = DID_ABORT << 16; + goto SkipForAbort; + } + + scsi_unlock(host); + + /* reject the command if the direction indicator + * is UNKNOWN + */ + if (us->srb->sc_data_direction == DMA_BIDIRECTIONAL) { + US_DEBUGP("UNKNOWN data direction\n"); + us->srb->result = DID_ERROR << 16; + } + + /* reject if target != 0 or if LUN is higher than + * the maximum known LUN + */ + else if (us->srb->device->id && + !(us->flags & US_FL_SCM_MULT_TARG)) { + US_DEBUGP("Bad target number (%d:%d)\n", + us->srb->device->id, us->srb->device->lun); + us->srb->result = DID_BAD_TARGET << 16; + } + + else if (us->srb->device->lun > us->max_lun) { + US_DEBUGP("Bad LUN (%d:%d)\n", + us->srb->device->id, us->srb->device->lun); + us->srb->result = DID_BAD_TARGET << 16; + } + + /* Handle those devices which need us to fake + * their inquiry data */ + else if ((us->srb->cmnd[0] == INQUIRY) && + (us->flags & US_FL_FIX_INQUIRY)) { + unsigned char data_ptr[36] = { + 0x00, 0x80, 0x02, 0x02, + 0x1F, 0x00, 0x00, 0x00}; + + US_DEBUGP("Faking INQUIRY command\n"); + fill_inquiry_response(us, data_ptr, 36); + us->srb->result = SAM_STAT_GOOD; + } + + /* we've got a command, let's do it! */ + else { + US_DEBUG(usb_stor_show_command(us->srb)); + us->proto_handler(us->srb, us); + } + + /* lock access to the state */ + scsi_lock(host); + + /* indicate that the command is done */ + if (us->srb->result != DID_ABORT << 16) { + US_DEBUGP("scsi cmd done, result=0x%x\n", + us->srb->result); + us->srb->scsi_done(us->srb); + } else { +SkipForAbort: + US_DEBUGP("scsi command aborted\n"); + } + + /* If an abort request was received we need to signal that + * the abort has finished. The proper test for this is + * the TIMED_OUT flag, not srb->result == DID_ABORT, because + * a timeout/abort request might be received after all the + * USB processing was complete. */ + if (test_bit(US_FLIDX_TIMED_OUT, &us->flags)) + complete(&(us->notify)); + + /* finished working on this command */ + us->srb = NULL; + scsi_unlock(host); + + /* unlock the device pointers */ + up(&(us->dev_semaphore)); + } /* for (;;) */ + + scsi_host_put(host); + + /* notify the exit routine that we're actually exiting now + * + * complete()/wait_for_completion() is similar to up()/down(), + * except that complete() is safe in the case where the structure + * is getting deleted in a parallel mode of execution (i.e. just + * after the down() -- that's necessary for the thread-shutdown + * case. + * + * complete_and_exit() goes even further than this -- it is safe in + * the case that the thread of the caller is going away (not just + * the structure) -- this is necessary for the module-remove case. + * This is important in preemption kernels, which transfer the flow + * of execution immediately upon a complete(). + */ + complete_and_exit(&threads_gone, 0); +} + +/*********************************************************************** + * Device probing and disconnecting + ***********************************************************************/ + +/* Associate our private data with the USB device */ +static int associate_dev(struct us_data *us, struct usb_interface *intf) +{ + US_DEBUGP("-- %s\n", __FUNCTION__); + + /* Fill in the device-related fields */ + us->pusb_dev = interface_to_usbdev(intf); + us->pusb_intf = intf; + us->ifnum = intf->cur_altsetting->desc.bInterfaceNumber; + US_DEBUGP("Vendor: 0x%04x, Product: 0x%04x, Revision: 0x%04x\n", + le16_to_cpu(us->pusb_dev->descriptor.idVendor), + le16_to_cpu(us->pusb_dev->descriptor.idProduct), + le16_to_cpu(us->pusb_dev->descriptor.bcdDevice)); + US_DEBUGP("Interface Subclass: 0x%02x, Protocol: 0x%02x\n", + intf->cur_altsetting->desc.bInterfaceSubClass, + intf->cur_altsetting->desc.bInterfaceProtocol); + + /* Store our private data in the interface */ + usb_set_intfdata(intf, us); + + /* Allocate the device-related DMA-mapped buffers */ + us->cr = usb_buffer_alloc(us->pusb_dev, sizeof(*us->cr), + GFP_KERNEL, &us->cr_dma); + if (!us->cr) { + US_DEBUGP("usb_ctrlrequest allocation failed\n"); + return -ENOMEM; + } + + us->iobuf = usb_buffer_alloc(us->pusb_dev, US_IOBUF_SIZE, + GFP_KERNEL, &us->iobuf_dma); + if (!us->iobuf) { + US_DEBUGP("I/O buffer allocation failed\n"); + return -ENOMEM; + } + return 0; +} + +/* Get the unusual_devs entries and the string descriptors */ +static void get_device_info(struct us_data *us, int id_index) +{ + struct usb_device *dev = us->pusb_dev; + struct usb_interface_descriptor *idesc = + &us->pusb_intf->cur_altsetting->desc; + struct us_unusual_dev *unusual_dev = &us_unusual_dev_list[id_index]; + struct usb_device_id *id = &storage_usb_ids[id_index]; + + /* Store the entries */ + us->unusual_dev = unusual_dev; + us->subclass = (unusual_dev->useProtocol == US_SC_DEVICE) ? + idesc->bInterfaceSubClass : + unusual_dev->useProtocol; + us->protocol = (unusual_dev->useTransport == US_PR_DEVICE) ? + idesc->bInterfaceProtocol : + unusual_dev->useTransport; + us->flags = unusual_dev->flags; + + /* + * This flag is only needed when we're in high-speed, so let's + * disable it if we're in full-speed + */ + if (dev->speed != USB_SPEED_HIGH) + us->flags &= ~US_FL_GO_SLOW; + + /* Log a message if a non-generic unusual_dev entry contains an + * unnecessary subclass or protocol override. This may stimulate + * reports from users that will help us remove unneeded entries + * from the unusual_devs.h table. + */ + if (id->idVendor || id->idProduct) { + static char *msgs[3] = { + "an unneeded SubClass entry", + "an unneeded Protocol entry", + "unneeded SubClass and Protocol entries"}; + struct usb_device_descriptor *ddesc = &dev->descriptor; + int msg = -1; + + if (unusual_dev->useProtocol != US_SC_DEVICE && + us->subclass == idesc->bInterfaceSubClass) + msg += 1; + if (unusual_dev->useTransport != US_PR_DEVICE && + us->protocol == idesc->bInterfaceProtocol) + msg += 2; + if (msg >= 0 && !(unusual_dev->flags & US_FL_NEED_OVERRIDE)) + printk(KERN_NOTICE USB_STORAGE "This device " + "(%04x,%04x,%04x S %02x P %02x)" + " has %s in unusual_devs.h\n" + " Please send a copy of this message to " + "<linux-usb-devel@lists.sourceforge.net>\n", + le16_to_cpu(ddesc->idVendor), + le16_to_cpu(ddesc->idProduct), + le16_to_cpu(ddesc->bcdDevice), + idesc->bInterfaceSubClass, + idesc->bInterfaceProtocol, + msgs[msg]); + } +} + +/* Get the transport settings */ +static int get_transport(struct us_data *us) +{ + switch (us->protocol) { + case US_PR_CB: + us->transport_name = "Control/Bulk"; + us->transport = usb_stor_CB_transport; + us->transport_reset = usb_stor_CB_reset; + us->max_lun = 7; + break; + + case US_PR_CBI: + us->transport_name = "Control/Bulk/Interrupt"; + us->transport = usb_stor_CBI_transport; + us->transport_reset = usb_stor_CB_reset; + us->max_lun = 7; + break; + + case US_PR_BULK: + us->transport_name = "Bulk"; + us->transport = usb_stor_Bulk_transport; + us->transport_reset = usb_stor_Bulk_reset; + break; + +#ifdef CONFIG_USB_STORAGE_USBAT + case US_PR_SCM_ATAPI: + us->transport_name = "SCM/ATAPI"; + us->transport = usbat_transport; + us->transport_reset = usb_stor_CB_reset; + us->max_lun = 1; + break; +#endif + +#ifdef CONFIG_USB_STORAGE_SDDR09 + case US_PR_EUSB_SDDR09: + us->transport_name = "EUSB/SDDR09"; + us->transport = sddr09_transport; + us->transport_reset = usb_stor_CB_reset; + us->max_lun = 0; + break; +#endif + +#ifdef CONFIG_USB_STORAGE_SDDR55 + case US_PR_SDDR55: + us->transport_name = "SDDR55"; + us->transport = sddr55_transport; + us->transport_reset = sddr55_reset; + us->max_lun = 0; + break; +#endif + +#ifdef CONFIG_USB_STORAGE_DPCM + case US_PR_DPCM_USB: + us->transport_name = "Control/Bulk-EUSB/SDDR09"; + us->transport = dpcm_transport; + us->transport_reset = usb_stor_CB_reset; + us->max_lun = 1; + break; +#endif + +#ifdef CONFIG_USB_STORAGE_FREECOM + case US_PR_FREECOM: + us->transport_name = "Freecom"; + us->transport = freecom_transport; + us->transport_reset = usb_stor_freecom_reset; + us->max_lun = 0; + break; +#endif + +#ifdef CONFIG_USB_STORAGE_DATAFAB + case US_PR_DATAFAB: + us->transport_name = "Datafab Bulk-Only"; + us->transport = datafab_transport; + us->transport_reset = usb_stor_Bulk_reset; + us->max_lun = 1; + break; +#endif + +#ifdef CONFIG_USB_STORAGE_JUMPSHOT + case US_PR_JUMPSHOT: + us->transport_name = "Lexar Jumpshot Control/Bulk"; + us->transport = jumpshot_transport; + us->transport_reset = usb_stor_Bulk_reset; + us->max_lun = 1; + break; +#endif + + default: + return -EIO; + } + US_DEBUGP("Transport: %s\n", us->transport_name); + + /* fix for single-lun devices */ + if (us->flags & US_FL_SINGLE_LUN) + us->max_lun = 0; + return 0; +} + +/* Get the protocol settings */ +static int get_protocol(struct us_data *us) +{ + switch (us->subclass) { + case US_SC_RBC: + us->protocol_name = "Reduced Block Commands (RBC)"; + us->proto_handler = usb_stor_transparent_scsi_command; + break; + + case US_SC_8020: + us->protocol_name = "8020i"; + us->proto_handler = usb_stor_ATAPI_command; + us->max_lun = 0; + break; + + case US_SC_QIC: + us->protocol_name = "QIC-157"; + us->proto_handler = usb_stor_qic157_command; + us->max_lun = 0; + break; + + case US_SC_8070: + us->protocol_name = "8070i"; + us->proto_handler = usb_stor_ATAPI_command; + us->max_lun = 0; + break; + + case US_SC_SCSI: + us->protocol_name = "Transparent SCSI"; + us->proto_handler = usb_stor_transparent_scsi_command; + break; + + case US_SC_UFI: + us->protocol_name = "Uniform Floppy Interface (UFI)"; + us->proto_handler = usb_stor_ufi_command; + break; + +#ifdef CONFIG_USB_STORAGE_ISD200 + case US_SC_ISD200: + us->protocol_name = "ISD200 ATA/ATAPI"; + us->proto_handler = isd200_ata_command; + break; +#endif + + default: + return -EIO; + } + US_DEBUGP("Protocol: %s\n", us->protocol_name); + return 0; +} + +/* Get the pipe settings */ +static int get_pipes(struct us_data *us) +{ + struct usb_host_interface *altsetting = + us->pusb_intf->cur_altsetting; + int i; + struct usb_endpoint_descriptor *ep; + struct usb_endpoint_descriptor *ep_in = NULL; + struct usb_endpoint_descriptor *ep_out = NULL; + struct usb_endpoint_descriptor *ep_int = NULL; + + /* + * Find the endpoints we need. + * We are expecting a minimum of 2 endpoints - in and out (bulk). + * An optional interrupt is OK (necessary for CBI protocol). + * We will ignore any others. + */ + for (i = 0; i < altsetting->desc.bNumEndpoints; i++) { + ep = &altsetting->endpoint[i].desc; + + /* Is it a BULK endpoint? */ + if ((ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) + == USB_ENDPOINT_XFER_BULK) { + /* BULK in or out? */ + if (ep->bEndpointAddress & USB_DIR_IN) + ep_in = ep; + else + ep_out = ep; + } + + /* Is it an interrupt endpoint? */ + else if ((ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) + == USB_ENDPOINT_XFER_INT) { + ep_int = ep; + } + } + + if (!ep_in || !ep_out || (us->protocol == US_PR_CBI && !ep_int)) { + US_DEBUGP("Endpoint sanity check failed! Rejecting dev.\n"); + return -EIO; + } + + /* Calculate and store the pipe values */ + us->send_ctrl_pipe = usb_sndctrlpipe(us->pusb_dev, 0); + us->recv_ctrl_pipe = usb_rcvctrlpipe(us->pusb_dev, 0); + us->send_bulk_pipe = usb_sndbulkpipe(us->pusb_dev, + ep_out->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); + us->recv_bulk_pipe = usb_rcvbulkpipe(us->pusb_dev, + ep_in->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); + if (ep_int) { + us->recv_intr_pipe = usb_rcvintpipe(us->pusb_dev, + ep_int->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); + us->ep_bInterval = ep_int->bInterval; + } + return 0; +} + +/* Initialize all the dynamic resources we need */ +static int usb_stor_acquire_resources(struct us_data *us) +{ + int p; + + us->current_urb = usb_alloc_urb(0, GFP_KERNEL); + if (!us->current_urb) { + US_DEBUGP("URB allocation failed\n"); + return -ENOMEM; + } + + /* Lock the device while we carry out the next two operations */ + down(&us->dev_semaphore); + + /* For bulk-only devices, determine the max LUN value */ + if (us->protocol == US_PR_BULK) { + p = usb_stor_Bulk_max_lun(us); + if (p < 0) { + up(&us->dev_semaphore); + return p; + } + us->max_lun = p; + } + + /* Just before we start our control thread, initialize + * the device if it needs initialization */ + if (us->unusual_dev->initFunction) + us->unusual_dev->initFunction(us); + + up(&us->dev_semaphore); + + /* Start up our control thread */ + p = kernel_thread(usb_stor_control_thread, us, CLONE_VM); + if (p < 0) { + printk(KERN_WARNING USB_STORAGE + "Unable to start control thread\n"); + return p; + } + us->pid = p; + atomic_inc(&total_threads); + + /* Wait for the thread to start */ + wait_for_completion(&(us->notify)); + + return 0; +} + +/* Release all our dynamic resources */ +static void usb_stor_release_resources(struct us_data *us) +{ + US_DEBUGP("-- %s\n", __FUNCTION__); + + /* Tell the control thread to exit. The SCSI host must + * already have been removed so it won't try to queue + * any more commands. + */ + US_DEBUGP("-- sending exit command to thread\n"); + up(&us->sema); + + /* Call the destructor routine, if it exists */ + if (us->extra_destructor) { + US_DEBUGP("-- calling extra_destructor()\n"); + us->extra_destructor(us->extra); + } + + /* Free the extra data and the URB */ + kfree(us->extra); + usb_free_urb(us->current_urb); +} + +/* Dissociate from the USB device */ +static void dissociate_dev(struct us_data *us) +{ + US_DEBUGP("-- %s\n", __FUNCTION__); + + /* Free the device-related DMA-mapped buffers */ + if (us->cr) + usb_buffer_free(us->pusb_dev, sizeof(*us->cr), us->cr, + us->cr_dma); + if (us->iobuf) + usb_buffer_free(us->pusb_dev, US_IOBUF_SIZE, us->iobuf, + us->iobuf_dma); + + /* Remove our private data from the interface */ + usb_set_intfdata(us->pusb_intf, NULL); +} + +/* Thread to carry out delayed SCSI-device scanning */ +static int usb_stor_scan_thread(void * __us) +{ + struct us_data *us = (struct us_data *)__us; + + /* + * This thread doesn't need any user-level access, + * so get rid of all our resources. + */ + lock_kernel(); + daemonize("usb-stor-scan"); + unlock_kernel(); + + /* Acquire a reference to the host, so it won't be deallocated + * until we're ready to exit */ + scsi_host_get(us_to_host(us)); + + /* Signal that we've started the thread */ + complete(&(us->notify)); + + printk(KERN_DEBUG + "usb-storage: device found at %d\n", us->pusb_dev->devnum); + + /* Wait for the timeout to expire or for a disconnect */ + if (delay_use > 0) { + printk(KERN_DEBUG "usb-storage: waiting for device " + "to settle before scanning\n"); +retry: + wait_event_interruptible_timeout(us->delay_wait, + test_bit(US_FLIDX_DISCONNECTING, &us->flags), + delay_use * HZ); + if (current->flags & PF_FREEZE) { + refrigerator(PF_FREEZE); + goto retry; + } + } + + /* If the device is still connected, perform the scanning */ + if (!test_bit(US_FLIDX_DISCONNECTING, &us->flags)) { + scsi_scan_host(us_to_host(us)); + printk(KERN_DEBUG "usb-storage: device scan complete\n"); + + /* Should we unbind if no devices were detected? */ + } + + scsi_host_put(us_to_host(us)); + complete_and_exit(&threads_gone, 0); +} + + +/* Probe to see if we can drive a newly-connected USB device */ +static int storage_probe(struct usb_interface *intf, + const struct usb_device_id *id) +{ + struct Scsi_Host *host; + struct us_data *us; + const int id_index = id - storage_usb_ids; + int result; + + US_DEBUGP("USB Mass Storage device detected\n"); + + /* + * Ask the SCSI layer to allocate a host structure, with extra + * space at the end for our private us_data structure. + */ + host = scsi_host_alloc(&usb_stor_host_template, sizeof(*us)); + if (!host) { + printk(KERN_WARNING USB_STORAGE + "Unable to allocate the scsi host\n"); + return -ENOMEM; + } + + us = host_to_us(host); + memset(us, 0, sizeof(struct us_data)); + init_MUTEX(&(us->dev_semaphore)); + init_MUTEX_LOCKED(&(us->sema)); + init_completion(&(us->notify)); + init_waitqueue_head(&us->delay_wait); + + /* Associate the us_data structure with the USB device */ + result = associate_dev(us, intf); + if (result) + goto BadDevice; + + /* + * Get the unusual_devs entries and the descriptors + * + * id_index is calculated in the declaration to be the index number + * of the match from the usb_device_id table, so we can find the + * corresponding entry in the private table. + */ + get_device_info(us, id_index); + +#ifdef CONFIG_USB_STORAGE_SDDR09 + if (us->protocol == US_PR_EUSB_SDDR09 || + us->protocol == US_PR_DPCM_USB) { + /* set the configuration -- STALL is an acceptable response here */ + if (us->pusb_dev->actconfig->desc.bConfigurationValue != 1) { + US_DEBUGP("active config #%d != 1 ??\n", us->pusb_dev + ->actconfig->desc.bConfigurationValue); + goto BadDevice; + } + result = usb_reset_configuration(us->pusb_dev); + + US_DEBUGP("Result of usb_reset_configuration is %d\n", result); + if (result == -EPIPE) { + US_DEBUGP("-- stall on control interface\n"); + } else if (result != 0) { + /* it's not a stall, but another error -- time to bail */ + US_DEBUGP("-- Unknown error. Rejecting device\n"); + goto BadDevice; + } + } +#endif + + /* Get the transport, protocol, and pipe settings */ + result = get_transport(us); + if (result) + goto BadDevice; + result = get_protocol(us); + if (result) + goto BadDevice; + result = get_pipes(us); + if (result) + goto BadDevice; + + /* Acquire all the other resources and add the host */ + result = usb_stor_acquire_resources(us); + if (result) + goto BadDevice; + result = scsi_add_host(host, &intf->dev); + if (result) { + printk(KERN_WARNING USB_STORAGE + "Unable to add the scsi host\n"); + goto BadDevice; + } + + /* Start up the thread for delayed SCSI-device scanning */ + result = kernel_thread(usb_stor_scan_thread, us, CLONE_VM); + if (result < 0) { + printk(KERN_WARNING USB_STORAGE + "Unable to start the device-scanning thread\n"); + scsi_remove_host(host); + goto BadDevice; + } + atomic_inc(&total_threads); + + /* Wait for the thread to start */ + wait_for_completion(&(us->notify)); + + return 0; + + /* We come here if there are any problems */ +BadDevice: + US_DEBUGP("storage_probe() failed\n"); + set_bit(US_FLIDX_DISCONNECTING, &us->flags); + usb_stor_release_resources(us); + dissociate_dev(us); + scsi_host_put(host); + return result; +} + +/* Handle a disconnect event from the USB core */ +static void storage_disconnect(struct usb_interface *intf) +{ + struct us_data *us = usb_get_intfdata(intf); + + US_DEBUGP("storage_disconnect() called\n"); + + /* Prevent new USB transfers, stop the current command, and + * interrupt a SCSI-scan or device-reset delay */ + set_bit(US_FLIDX_DISCONNECTING, &us->flags); + usb_stor_stop_transport(us); + wake_up(&us->delay_wait); + + /* It doesn't matter if the SCSI-scanning thread is still running. + * The thread will exit when it sees the DISCONNECTING flag. */ + + /* Wait for the current command to finish, then remove the host */ + down(&us->dev_semaphore); + up(&us->dev_semaphore); + scsi_remove_host(us_to_host(us)); + + /* Wait for everything to become idle and release all our resources */ + usb_stor_release_resources(us); + dissociate_dev(us); + + /* Drop our reference to the host; the SCSI core will free it + * (and "us" along with it) when the refcount becomes 0. */ + scsi_host_put(us_to_host(us)); +} + +/*********************************************************************** + * Initialization and registration + ***********************************************************************/ + +static int __init usb_stor_init(void) +{ + int retval; + printk(KERN_INFO "Initializing USB Mass Storage driver...\n"); + + /* register the driver, return usb_register return code if error */ + retval = usb_register(&usb_storage_driver); + if (retval == 0) + printk(KERN_INFO "USB Mass Storage support registered.\n"); + + return retval; +} + +static void __exit usb_stor_exit(void) +{ + US_DEBUGP("usb_stor_exit() called\n"); + + /* Deregister the driver + * This will cause disconnect() to be called for each + * attached unit + */ + US_DEBUGP("-- calling usb_deregister()\n"); + usb_deregister(&usb_storage_driver) ; + + /* Don't return until all of our control and scanning threads + * have exited. Since each thread signals threads_gone as its + * last act, we have to call wait_for_completion the right number + * of times. + */ + while (atomic_read(&total_threads) > 0) { + wait_for_completion(&threads_gone); + atomic_dec(&total_threads); + } +} + +module_init(usb_stor_init); +module_exit(usb_stor_exit); |
