1035 lines
29 KiB
C
1035 lines
29 KiB
C
/* Driver for USB Mass Storage compliant devices
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*
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* $Id: usb.c,v 1.75 2002/04/22 03:39:43 mdharm Exp $
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*
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* Current development and maintenance by:
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* (c) 1999-2003 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
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*
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* Developed with the assistance of:
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* (c) 2000 David L. Brown, Jr. (usb-storage@davidb.org)
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* (c) 2003 Alan Stern (stern@rowland.harvard.edu)
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*
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* Initial work by:
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* (c) 1999 Michael Gee (michael@linuxspecific.com)
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*
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* usb_device_id support by Adam J. Richter (adam@yggdrasil.com):
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* (c) 2000 Yggdrasil Computing, Inc.
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*
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* This driver is based on the 'USB Mass Storage Class' document. This
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* describes in detail the protocol used to communicate with such
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* devices. Clearly, the designers had SCSI and ATAPI commands in
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* mind when they created this document. The commands are all very
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* similar to commands in the SCSI-II and ATAPI specifications.
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*
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* It is important to note that in a number of cases this class
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* exhibits class-specific exemptions from the USB specification.
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* Notably the usage of NAK, STALL and ACK differs from the norm, in
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* that they are used to communicate wait, failed and OK on commands.
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*
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* Also, for certain devices, the interrupt endpoint is used to convey
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* status of a command.
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*
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* Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more
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* information about this driver.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/config.h>
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#include <linux/sched.h>
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#include <linux/errno.h>
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#include <linux/suspend.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/kthread.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_device.h>
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#include "usb.h"
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#include "scsiglue.h"
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#include "transport.h"
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#include "protocol.h"
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#include "debug.h"
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#include "initializers.h"
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#ifdef CONFIG_USB_STORAGE_USBAT
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#include "shuttle_usbat.h"
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#endif
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#ifdef CONFIG_USB_STORAGE_SDDR09
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#include "sddr09.h"
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#endif
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#ifdef CONFIG_USB_STORAGE_SDDR55
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#include "sddr55.h"
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#endif
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#ifdef CONFIG_USB_STORAGE_DPCM
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#include "dpcm.h"
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#endif
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#ifdef CONFIG_USB_STORAGE_FREECOM
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#include "freecom.h"
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#endif
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#ifdef CONFIG_USB_STORAGE_ISD200
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#include "isd200.h"
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#endif
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#ifdef CONFIG_USB_STORAGE_DATAFAB
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#include "datafab.h"
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#endif
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#ifdef CONFIG_USB_STORAGE_JUMPSHOT
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#include "jumpshot.h"
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#endif
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#ifdef CONFIG_USB_STORAGE_ONETOUCH
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#include "onetouch.h"
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#endif
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/* Some informational data */
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MODULE_AUTHOR("Matthew Dharm <mdharm-usb@one-eyed-alien.net>");
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MODULE_DESCRIPTION("USB Mass Storage driver for Linux");
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MODULE_LICENSE("GPL");
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static unsigned int delay_use = 5;
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module_param(delay_use, uint, S_IRUGO | S_IWUSR);
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MODULE_PARM_DESC(delay_use, "seconds to delay before using a new device");
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/* These are used to make sure the module doesn't unload before all the
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* threads have exited.
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*/
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static atomic_t total_threads = ATOMIC_INIT(0);
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static DECLARE_COMPLETION(threads_gone);
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/*
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* The entries in this table correspond, line for line,
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* with the entries of us_unusual_dev_list[].
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*/
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#ifndef CONFIG_USB_LIBUSUAL
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#define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \
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vendorName, productName,useProtocol, useTransport, \
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initFunction, flags) \
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{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin,bcdDeviceMax), \
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.driver_info = (flags)|(USB_US_TYPE_STOR<<24) }
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#define USUAL_DEV(useProto, useTrans, useType) \
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{ USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, useProto, useTrans), \
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.driver_info = (USB_US_TYPE_STOR<<24) }
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static struct usb_device_id storage_usb_ids [] = {
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# include "unusual_devs.h"
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#undef UNUSUAL_DEV
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#undef USUAL_DEV
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/* Terminating entry */
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{ }
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};
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MODULE_DEVICE_TABLE (usb, storage_usb_ids);
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#endif /* CONFIG_USB_LIBUSUAL */
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/* This is the list of devices we recognize, along with their flag data */
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/* The vendor name should be kept at eight characters or less, and
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* the product name should be kept at 16 characters or less. If a device
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* has the US_FL_FIX_INQUIRY flag, then the vendor and product names
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* normally generated by a device thorugh the INQUIRY response will be
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* taken from this list, and this is the reason for the above size
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* restriction. However, if the flag is not present, then you
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* are free to use as many characters as you like.
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*/
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#define UNUSUAL_DEV(idVendor, idProduct, bcdDeviceMin, bcdDeviceMax, \
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vendor_name, product_name, use_protocol, use_transport, \
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init_function, Flags) \
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{ \
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.vendorName = vendor_name, \
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.productName = product_name, \
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.useProtocol = use_protocol, \
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.useTransport = use_transport, \
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.initFunction = init_function, \
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}
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#define USUAL_DEV(use_protocol, use_transport, use_type) \
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{ \
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.useProtocol = use_protocol, \
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.useTransport = use_transport, \
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}
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static struct us_unusual_dev us_unusual_dev_list[] = {
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# include "unusual_devs.h"
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# undef UNUSUAL_DEV
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# undef USUAL_DEV
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/* Terminating entry */
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{ NULL }
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};
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#ifdef CONFIG_PM /* Minimal support for suspend and resume */
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static int storage_suspend(struct usb_interface *iface, pm_message_t message)
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{
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struct us_data *us = usb_get_intfdata(iface);
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/* Wait until no command is running */
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down(&us->dev_semaphore);
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US_DEBUGP("%s\n", __FUNCTION__);
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if (us->suspend_resume_hook)
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(us->suspend_resume_hook)(us, US_SUSPEND);
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iface->dev.power.power_state.event = message.event;
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/* When runtime PM is working, we'll set a flag to indicate
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* whether we should autoresume when a SCSI request arrives. */
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up(&us->dev_semaphore);
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return 0;
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}
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static int storage_resume(struct usb_interface *iface)
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{
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struct us_data *us = usb_get_intfdata(iface);
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down(&us->dev_semaphore);
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US_DEBUGP("%s\n", __FUNCTION__);
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if (us->suspend_resume_hook)
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(us->suspend_resume_hook)(us, US_RESUME);
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iface->dev.power.power_state.event = PM_EVENT_ON;
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up(&us->dev_semaphore);
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return 0;
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}
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#endif /* CONFIG_PM */
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/*
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* fill_inquiry_response takes an unsigned char array (which must
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* be at least 36 characters) and populates the vendor name,
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* product name, and revision fields. Then the array is copied
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* into the SCSI command's response buffer (oddly enough
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* called request_buffer). data_len contains the length of the
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* data array, which again must be at least 36.
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*/
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void fill_inquiry_response(struct us_data *us, unsigned char *data,
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unsigned int data_len)
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{
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if (data_len<36) // You lose.
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return;
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if(data[0]&0x20) { /* USB device currently not connected. Return
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peripheral qualifier 001b ("...however, the
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physical device is not currently connected
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to this logical unit") and leave vendor and
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product identification empty. ("If the target
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does store some of the INQUIRY data on the
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device, it may return zeros or ASCII spaces
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(20h) in those fields until the data is
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available from the device."). */
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memset(data+8,0,28);
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} else {
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u16 bcdDevice = le16_to_cpu(us->pusb_dev->descriptor.bcdDevice);
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memcpy(data+8, us->unusual_dev->vendorName,
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strlen(us->unusual_dev->vendorName) > 8 ? 8 :
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strlen(us->unusual_dev->vendorName));
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memcpy(data+16, us->unusual_dev->productName,
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strlen(us->unusual_dev->productName) > 16 ? 16 :
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strlen(us->unusual_dev->productName));
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data[32] = 0x30 + ((bcdDevice>>12) & 0x0F);
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data[33] = 0x30 + ((bcdDevice>>8) & 0x0F);
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data[34] = 0x30 + ((bcdDevice>>4) & 0x0F);
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data[35] = 0x30 + ((bcdDevice) & 0x0F);
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}
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usb_stor_set_xfer_buf(data, data_len, us->srb);
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}
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static int usb_stor_control_thread(void * __us)
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{
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struct us_data *us = (struct us_data *)__us;
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struct Scsi_Host *host = us_to_host(us);
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current->flags |= PF_NOFREEZE;
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for(;;) {
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US_DEBUGP("*** thread sleeping.\n");
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if(down_interruptible(&us->sema))
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break;
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US_DEBUGP("*** thread awakened.\n");
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/* lock the device pointers */
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down(&(us->dev_semaphore));
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/* if the device has disconnected, we are free to exit */
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if (test_bit(US_FLIDX_DISCONNECTING, &us->flags)) {
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US_DEBUGP("-- exiting\n");
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up(&(us->dev_semaphore));
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break;
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}
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/* lock access to the state */
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scsi_lock(host);
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/* has the command timed out *already* ? */
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if (test_bit(US_FLIDX_TIMED_OUT, &us->flags)) {
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us->srb->result = DID_ABORT << 16;
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goto SkipForAbort;
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}
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scsi_unlock(host);
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/* reject the command if the direction indicator
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* is UNKNOWN
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*/
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if (us->srb->sc_data_direction == DMA_BIDIRECTIONAL) {
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US_DEBUGP("UNKNOWN data direction\n");
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us->srb->result = DID_ERROR << 16;
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}
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/* reject if target != 0 or if LUN is higher than
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* the maximum known LUN
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*/
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else if (us->srb->device->id &&
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!(us->flags & US_FL_SCM_MULT_TARG)) {
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US_DEBUGP("Bad target number (%d:%d)\n",
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us->srb->device->id, us->srb->device->lun);
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us->srb->result = DID_BAD_TARGET << 16;
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}
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else if (us->srb->device->lun > us->max_lun) {
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US_DEBUGP("Bad LUN (%d:%d)\n",
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us->srb->device->id, us->srb->device->lun);
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us->srb->result = DID_BAD_TARGET << 16;
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}
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/* Handle those devices which need us to fake
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* their inquiry data */
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else if ((us->srb->cmnd[0] == INQUIRY) &&
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(us->flags & US_FL_FIX_INQUIRY)) {
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unsigned char data_ptr[36] = {
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0x00, 0x80, 0x02, 0x02,
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0x1F, 0x00, 0x00, 0x00};
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US_DEBUGP("Faking INQUIRY command\n");
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fill_inquiry_response(us, data_ptr, 36);
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us->srb->result = SAM_STAT_GOOD;
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}
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/* we've got a command, let's do it! */
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else {
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US_DEBUG(usb_stor_show_command(us->srb));
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us->proto_handler(us->srb, us);
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}
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/* lock access to the state */
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scsi_lock(host);
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/* indicate that the command is done */
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if (us->srb->result != DID_ABORT << 16) {
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US_DEBUGP("scsi cmd done, result=0x%x\n",
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us->srb->result);
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us->srb->scsi_done(us->srb);
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} else {
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SkipForAbort:
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US_DEBUGP("scsi command aborted\n");
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}
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/* If an abort request was received we need to signal that
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* the abort has finished. The proper test for this is
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* the TIMED_OUT flag, not srb->result == DID_ABORT, because
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* the timeout might have occurred after the command had
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* already completed with a different result code. */
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if (test_bit(US_FLIDX_TIMED_OUT, &us->flags)) {
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complete(&(us->notify));
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/* Allow USB transfers to resume */
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clear_bit(US_FLIDX_ABORTING, &us->flags);
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clear_bit(US_FLIDX_TIMED_OUT, &us->flags);
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}
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/* finished working on this command */
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us->srb = NULL;
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scsi_unlock(host);
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/* unlock the device pointers */
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up(&(us->dev_semaphore));
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} /* for (;;) */
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scsi_host_put(host);
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/* notify the exit routine that we're actually exiting now
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*
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* complete()/wait_for_completion() is similar to up()/down(),
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* except that complete() is safe in the case where the structure
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* is getting deleted in a parallel mode of execution (i.e. just
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* after the down() -- that's necessary for the thread-shutdown
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* case.
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*
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* complete_and_exit() goes even further than this -- it is safe in
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* the case that the thread of the caller is going away (not just
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* the structure) -- this is necessary for the module-remove case.
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* This is important in preemption kernels, which transfer the flow
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* of execution immediately upon a complete().
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*/
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complete_and_exit(&threads_gone, 0);
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}
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|
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/***********************************************************************
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* Device probing and disconnecting
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***********************************************************************/
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|
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/* Associate our private data with the USB device */
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static int associate_dev(struct us_data *us, struct usb_interface *intf)
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{
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US_DEBUGP("-- %s\n", __FUNCTION__);
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|
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/* Fill in the device-related fields */
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us->pusb_dev = interface_to_usbdev(intf);
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us->pusb_intf = intf;
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us->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
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US_DEBUGP("Vendor: 0x%04x, Product: 0x%04x, Revision: 0x%04x\n",
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le16_to_cpu(us->pusb_dev->descriptor.idVendor),
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le16_to_cpu(us->pusb_dev->descriptor.idProduct),
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le16_to_cpu(us->pusb_dev->descriptor.bcdDevice));
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US_DEBUGP("Interface Subclass: 0x%02x, Protocol: 0x%02x\n",
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intf->cur_altsetting->desc.bInterfaceSubClass,
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intf->cur_altsetting->desc.bInterfaceProtocol);
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|
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/* Store our private data in the interface */
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usb_set_intfdata(intf, us);
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|
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/* Allocate the device-related DMA-mapped buffers */
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us->cr = usb_buffer_alloc(us->pusb_dev, sizeof(*us->cr),
|
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GFP_KERNEL, &us->cr_dma);
|
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if (!us->cr) {
|
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US_DEBUGP("usb_ctrlrequest allocation failed\n");
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return -ENOMEM;
|
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}
|
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|
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us->iobuf = usb_buffer_alloc(us->pusb_dev, US_IOBUF_SIZE,
|
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GFP_KERNEL, &us->iobuf_dma);
|
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if (!us->iobuf) {
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US_DEBUGP("I/O buffer allocation failed\n");
|
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return -ENOMEM;
|
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}
|
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|
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us->sensebuf = kmalloc(US_SENSE_SIZE, GFP_KERNEL);
|
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if (!us->sensebuf) {
|
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US_DEBUGP("Sense buffer allocation failed\n");
|
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return -ENOMEM;
|
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}
|
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return 0;
|
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}
|
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|
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/* Find an unusual_dev descriptor (always succeeds in the current code) */
|
|
static struct us_unusual_dev *find_unusual(const struct usb_device_id *id)
|
|
{
|
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const int id_index = id - storage_usb_ids;
|
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return &us_unusual_dev_list[id_index];
|
|
}
|
|
|
|
/* Get the unusual_devs entries and the string descriptors */
|
|
static void get_device_info(struct us_data *us, const struct usb_device_id *id)
|
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{
|
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struct usb_device *dev = us->pusb_dev;
|
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struct usb_interface_descriptor *idesc =
|
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&us->pusb_intf->cur_altsetting->desc;
|
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struct us_unusual_dev *unusual_dev = find_unusual(id);
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|
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/* Store the entries */
|
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us->unusual_dev = unusual_dev;
|
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us->subclass = (unusual_dev->useProtocol == US_SC_DEVICE) ?
|
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idesc->bInterfaceSubClass :
|
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unusual_dev->useProtocol;
|
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us->protocol = (unusual_dev->useTransport == US_PR_DEVICE) ?
|
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idesc->bInterfaceProtocol :
|
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unusual_dev->useTransport;
|
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us->flags = USB_US_ORIG_FLAGS(id->driver_info);
|
|
|
|
/*
|
|
* 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)
|
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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 const 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 && !(us->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_USBAT:
|
|
us->transport_name = "Shuttle USBAT";
|
|
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;
|
|
struct task_struct *th;
|
|
|
|
us->current_urb = usb_alloc_urb(0, GFP_KERNEL);
|
|
if (!us->current_urb) {
|
|
US_DEBUGP("URB allocation failed\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* Just before we start our control thread, initialize
|
|
* the device if it needs initialization */
|
|
if (us->unusual_dev->initFunction) {
|
|
p = us->unusual_dev->initFunction(us);
|
|
if (p)
|
|
return p;
|
|
}
|
|
|
|
/* Start up our control thread */
|
|
th = kthread_create(usb_stor_control_thread, us, "usb-storage");
|
|
if (IS_ERR(th)) {
|
|
printk(KERN_WARNING USB_STORAGE
|
|
"Unable to start control thread\n");
|
|
return PTR_ERR(th);
|
|
}
|
|
|
|
/* Take a reference to the host for the control thread and
|
|
* count it among all the threads we have launched. Then
|
|
* start it up. */
|
|
scsi_host_get(us_to_host(us));
|
|
atomic_inc(&total_threads);
|
|
wake_up_process(th);
|
|
|
|
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");
|
|
set_bit(US_FLIDX_DISCONNECTING, &us->flags);
|
|
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__);
|
|
|
|
kfree(us->sensebuf);
|
|
|
|
/* 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);
|
|
}
|
|
|
|
/* First stage of disconnect processing: stop all commands and remove
|
|
* the host */
|
|
static void quiesce_and_remove_host(struct us_data *us)
|
|
{
|
|
/* 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);
|
|
|
|
/* queuecommand won't accept any new commands and the control
|
|
* thread won't execute a previously-queued command. If there
|
|
* is such a command pending, complete it with an error. */
|
|
if (us->srb) {
|
|
us->srb->result = DID_NO_CONNECT << 16;
|
|
scsi_lock(us_to_host(us));
|
|
us->srb->scsi_done(us->srb);
|
|
us->srb = NULL;
|
|
scsi_unlock(us_to_host(us));
|
|
}
|
|
|
|
/* Now we own no commands so it's safe to remove the SCSI host */
|
|
scsi_remove_host(us_to_host(us));
|
|
}
|
|
|
|
/* Second stage of disconnect processing: deallocate all resources */
|
|
static void release_everything(struct us_data *us)
|
|
{
|
|
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));
|
|
}
|
|
|
|
/* Thread to carry out delayed SCSI-device scanning */
|
|
static int usb_stor_scan_thread(void * __us)
|
|
{
|
|
struct us_data *us = (struct us_data *)__us;
|
|
|
|
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 (try_to_freeze())
|
|
goto retry;
|
|
}
|
|
|
|
/* If the device is still connected, perform the scanning */
|
|
if (!test_bit(US_FLIDX_DISCONNECTING, &us->flags)) {
|
|
|
|
/* For bulk-only devices, determine the max LUN value */
|
|
if (us->protocol == US_PR_BULK &&
|
|
!(us->flags & US_FL_SINGLE_LUN)) {
|
|
down(&us->dev_semaphore);
|
|
us->max_lun = usb_stor_Bulk_max_lun(us);
|
|
up(&us->dev_semaphore);
|
|
}
|
|
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;
|
|
int result;
|
|
struct task_struct *th;
|
|
|
|
if (usb_usual_check_type(id, USB_US_TYPE_STOR))
|
|
return -ENXIO;
|
|
|
|
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);
|
|
|
|
/* 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 */
|
|
th = kthread_create(usb_stor_scan_thread, us, "usb-stor-scan");
|
|
if (IS_ERR(th)) {
|
|
printk(KERN_WARNING USB_STORAGE
|
|
"Unable to start the device-scanning thread\n");
|
|
quiesce_and_remove_host(us);
|
|
result = PTR_ERR(th);
|
|
goto BadDevice;
|
|
}
|
|
|
|
/* Take a reference to the host for the scanning thread and
|
|
* count it among all the threads we have launched. Then
|
|
* start it up. */
|
|
scsi_host_get(us_to_host(us));
|
|
atomic_inc(&total_threads);
|
|
wake_up_process(th);
|
|
|
|
return 0;
|
|
|
|
/* We come here if there are any problems */
|
|
BadDevice:
|
|
US_DEBUGP("storage_probe() failed\n");
|
|
release_everything(us);
|
|
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");
|
|
quiesce_and_remove_host(us);
|
|
release_everything(us);
|
|
}
|
|
|
|
/***********************************************************************
|
|
* Initialization and registration
|
|
***********************************************************************/
|
|
|
|
static struct usb_driver usb_storage_driver = {
|
|
.name = "usb-storage",
|
|
.probe = storage_probe,
|
|
.disconnect = storage_disconnect,
|
|
#ifdef CONFIG_PM
|
|
.suspend = storage_suspend,
|
|
.resume = storage_resume,
|
|
#endif
|
|
.id_table = storage_usb_ids,
|
|
};
|
|
|
|
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");
|
|
usb_usual_set_present(USB_US_TYPE_STOR);
|
|
}
|
|
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);
|
|
}
|
|
|
|
usb_usual_clear_present(USB_US_TYPE_STOR);
|
|
}
|
|
|
|
module_init(usb_stor_init);
|
|
module_exit(usb_stor_exit);
|