forked from mirrors/linux
USB: Add UAS driver
USB Attached SCSI is a new protocol specified jointly by the SCSI T10 committee and the USB Implementors Forum. Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Cc: Matthew Dharm <mdharm-usb@one-eyed-alien.net> [mina86@mina86.com: updated to use new USB_ prefix] Signed-off-by: Michal Nazarewicz <mina86@mina86.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Matthew Wilcox
Greg Kroah-Hartman
parent
ae6d22fe18
commit
115bb1ffa5
4 changed files with 773 additions and 0 deletions
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@ -5934,6 +5934,14 @@ S: Maintained
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F: Documentation/usb/acm.txt
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F: drivers/usb/class/cdc-acm.*
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USB ATTACHED SCSI
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M: Matthew Wilcox <willy@linux.intel.com>
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M: Sarah Sharp <sarah.a.sharp@linux.intel.com>
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L: linux-usb@vger.kernel.org
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L: linux-scsi@vger.kernel.org
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S: Supported
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F: drivers/usb/storage/uas.c
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USB BLOCK DRIVER (UB ub)
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M: Pete Zaitcev <zaitcev@redhat.com>
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L: linux-usb@vger.kernel.org
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@ -172,6 +172,19 @@ config USB_STORAGE_CYPRESS_ATACB
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If this driver is compiled as a module, it will be named ums-cypress.
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config USB_UAS
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tristate "USB Attached SCSI"
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depends on USB && SCSI
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help
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The USB Attached SCSI protocol is supported by some USB
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storage devices. It permits higher performance by supporting
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multiple outstanding commands.
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If you don't know whether you have a UAS device, it is safe to
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say 'Y' or 'M' here and the kernel will use the right driver.
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If you compile this driver as a module, it will be named uas.
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config USB_LIBUSUAL
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bool "The shared table of common (or usual) storage devices"
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depends on USB
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@ -7,6 +7,7 @@
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EXTRA_CFLAGS := -Idrivers/scsi
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obj-$(CONFIG_USB_UAS) += uas.o
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obj-$(CONFIG_USB_STORAGE) += usb-storage.o
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usb-storage-obj-$(CONFIG_USB_STORAGE_DEBUG) += debug.o
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751
drivers/usb/storage/uas.c
Normal file
751
drivers/usb/storage/uas.c
Normal file
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@ -0,0 +1,751 @@
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/*
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* USB Attached SCSI
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* Note that this is not the same as the USB Mass Storage driver
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*
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* Copyright Matthew Wilcox for Intel Corp, 2010
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* Copyright Sarah Sharp for Intel Corp, 2010
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*
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* Distributed under the terms of the GNU GPL, version two.
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*/
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#include <linux/blkdev.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/usb.h>
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#include <linux/usb/storage.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_dbg.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_tcq.h>
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/* Common header for all IUs */
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struct iu {
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__u8 iu_id;
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__u8 rsvd1;
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__be16 tag;
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};
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enum {
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IU_ID_COMMAND = 0x01,
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IU_ID_STATUS = 0x03,
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IU_ID_RESPONSE = 0x04,
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IU_ID_TASK_MGMT = 0x05,
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IU_ID_READ_READY = 0x06,
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IU_ID_WRITE_READY = 0x07,
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};
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struct command_iu {
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__u8 iu_id;
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__u8 rsvd1;
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__be16 tag;
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__u8 prio_attr;
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__u8 rsvd5;
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__u8 len;
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__u8 rsvd7;
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struct scsi_lun lun;
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__u8 cdb[16]; /* XXX: Overflow-checking tools may misunderstand */
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};
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struct sense_iu {
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__u8 iu_id;
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__u8 rsvd1;
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__be16 tag;
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__be16 status_qual;
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__u8 status;
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__u8 service_response;
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__u8 rsvd8[6];
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__be16 len;
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__u8 sense[SCSI_SENSE_BUFFERSIZE];
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};
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/*
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* The r00-r01c specs define this version of the SENSE IU data structure.
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* It's still in use by several different firmware releases.
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*/
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struct sense_iu_old {
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__u8 iu_id;
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__u8 rsvd1;
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__be16 tag;
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__be16 len;
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__u8 status;
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__u8 service_response;
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__u8 sense[SCSI_SENSE_BUFFERSIZE];
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};
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enum {
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CMD_PIPE_ID = 1,
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STATUS_PIPE_ID = 2,
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DATA_IN_PIPE_ID = 3,
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DATA_OUT_PIPE_ID = 4,
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UAS_SIMPLE_TAG = 0,
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UAS_HEAD_TAG = 1,
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UAS_ORDERED_TAG = 2,
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UAS_ACA = 4,
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};
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struct uas_dev_info {
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struct usb_interface *intf;
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struct usb_device *udev;
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int qdepth;
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unsigned cmd_pipe, status_pipe, data_in_pipe, data_out_pipe;
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unsigned use_streams:1;
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unsigned uas_sense_old:1;
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};
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enum {
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ALLOC_SENSE_URB = (1 << 0),
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SUBMIT_SENSE_URB = (1 << 1),
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ALLOC_DATA_IN_URB = (1 << 2),
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SUBMIT_DATA_IN_URB = (1 << 3),
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ALLOC_DATA_OUT_URB = (1 << 4),
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SUBMIT_DATA_OUT_URB = (1 << 5),
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ALLOC_CMD_URB = (1 << 6),
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SUBMIT_CMD_URB = (1 << 7),
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};
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/* Overrides scsi_pointer */
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struct uas_cmd_info {
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unsigned int state;
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unsigned int stream;
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struct urb *cmd_urb;
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struct urb *sense_urb;
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struct urb *data_in_urb;
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struct urb *data_out_urb;
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struct list_head list;
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};
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/* I hate forward declarations, but I actually have a loop */
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static int uas_submit_urbs(struct scsi_cmnd *cmnd,
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struct uas_dev_info *devinfo, gfp_t gfp);
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static DEFINE_SPINLOCK(uas_work_lock);
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static LIST_HEAD(uas_work_list);
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static void uas_do_work(struct work_struct *work)
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{
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struct uas_cmd_info *cmdinfo;
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struct list_head list;
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spin_lock_irq(&uas_work_lock);
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list_replace_init(&uas_work_list, &list);
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spin_unlock_irq(&uas_work_lock);
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list_for_each_entry(cmdinfo, &list, list) {
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struct scsi_pointer *scp = (void *)cmdinfo;
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struct scsi_cmnd *cmnd = container_of(scp,
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struct scsi_cmnd, SCp);
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uas_submit_urbs(cmnd, cmnd->device->hostdata, GFP_KERNEL);
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}
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}
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static DECLARE_WORK(uas_work, uas_do_work);
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static void uas_sense(struct urb *urb, struct scsi_cmnd *cmnd)
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{
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struct sense_iu *sense_iu = urb->transfer_buffer;
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struct scsi_device *sdev = cmnd->device;
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if (urb->actual_length > 16) {
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unsigned len = be16_to_cpup(&sense_iu->len);
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if (len + 16 != urb->actual_length) {
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int newlen = min(len + 16, urb->actual_length) - 16;
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if (newlen < 0)
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newlen = 0;
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sdev_printk(KERN_INFO, sdev, "%s: urb length %d "
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"disagrees with IU sense data length %d, "
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"using %d bytes of sense data\n", __func__,
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urb->actual_length, len, newlen);
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len = newlen;
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}
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memcpy(cmnd->sense_buffer, sense_iu->sense, len);
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}
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cmnd->result = sense_iu->status;
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if (sdev->current_cmnd)
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sdev->current_cmnd = NULL;
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cmnd->scsi_done(cmnd);
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usb_free_urb(urb);
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}
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static void uas_sense_old(struct urb *urb, struct scsi_cmnd *cmnd)
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{
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struct sense_iu_old *sense_iu = urb->transfer_buffer;
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struct scsi_device *sdev = cmnd->device;
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if (urb->actual_length > 8) {
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unsigned len = be16_to_cpup(&sense_iu->len) - 2;
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if (len + 8 != urb->actual_length) {
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int newlen = min(len + 8, urb->actual_length) - 8;
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if (newlen < 0)
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newlen = 0;
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sdev_printk(KERN_INFO, sdev, "%s: urb length %d "
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"disagrees with IU sense data length %d, "
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"using %d bytes of sense data\n", __func__,
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urb->actual_length, len, newlen);
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len = newlen;
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}
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memcpy(cmnd->sense_buffer, sense_iu->sense, len);
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}
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cmnd->result = sense_iu->status;
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if (sdev->current_cmnd)
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sdev->current_cmnd = NULL;
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cmnd->scsi_done(cmnd);
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usb_free_urb(urb);
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}
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static void uas_xfer_data(struct urb *urb, struct scsi_cmnd *cmnd,
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unsigned direction)
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{
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struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
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int err;
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cmdinfo->state = direction | SUBMIT_SENSE_URB;
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err = uas_submit_urbs(cmnd, cmnd->device->hostdata, GFP_ATOMIC);
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if (err) {
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spin_lock(&uas_work_lock);
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list_add_tail(&cmdinfo->list, &uas_work_list);
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spin_unlock(&uas_work_lock);
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schedule_work(&uas_work);
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}
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}
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static void uas_stat_cmplt(struct urb *urb)
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{
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struct iu *iu = urb->transfer_buffer;
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struct scsi_device *sdev = urb->context;
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struct uas_dev_info *devinfo = sdev->hostdata;
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struct scsi_cmnd *cmnd;
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u16 tag;
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if (urb->status) {
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dev_err(&urb->dev->dev, "URB BAD STATUS %d\n", urb->status);
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usb_free_urb(urb);
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return;
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}
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tag = be16_to_cpup(&iu->tag) - 1;
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if (sdev->current_cmnd)
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cmnd = sdev->current_cmnd;
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else
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cmnd = scsi_find_tag(sdev, tag);
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if (!cmnd)
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return;
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switch (iu->iu_id) {
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case IU_ID_STATUS:
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if (urb->actual_length < 16)
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devinfo->uas_sense_old = 1;
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if (devinfo->uas_sense_old)
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uas_sense_old(urb, cmnd);
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else
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uas_sense(urb, cmnd);
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break;
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case IU_ID_READ_READY:
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uas_xfer_data(urb, cmnd, SUBMIT_DATA_IN_URB);
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break;
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case IU_ID_WRITE_READY:
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uas_xfer_data(urb, cmnd, SUBMIT_DATA_OUT_URB);
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break;
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default:
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scmd_printk(KERN_ERR, cmnd,
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"Bogus IU (%d) received on status pipe\n", iu->iu_id);
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}
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}
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static void uas_data_cmplt(struct urb *urb)
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{
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struct scsi_data_buffer *sdb = urb->context;
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sdb->resid = sdb->length - urb->actual_length;
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usb_free_urb(urb);
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}
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static struct urb *uas_alloc_data_urb(struct uas_dev_info *devinfo, gfp_t gfp,
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unsigned int pipe, u16 stream_id,
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struct scsi_data_buffer *sdb,
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enum dma_data_direction dir)
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{
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struct usb_device *udev = devinfo->udev;
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struct urb *urb = usb_alloc_urb(0, gfp);
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if (!urb)
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goto out;
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usb_fill_bulk_urb(urb, udev, pipe, NULL, sdb->length, uas_data_cmplt,
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sdb);
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if (devinfo->use_streams)
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urb->stream_id = stream_id;
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urb->num_sgs = udev->bus->sg_tablesize ? sdb->table.nents : 0;
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urb->sg = sdb->table.sgl;
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out:
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return urb;
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}
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static struct urb *uas_alloc_sense_urb(struct uas_dev_info *devinfo, gfp_t gfp,
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struct scsi_cmnd *cmnd, u16 stream_id)
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{
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struct usb_device *udev = devinfo->udev;
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struct urb *urb = usb_alloc_urb(0, gfp);
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struct sense_iu *iu;
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if (!urb)
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goto out;
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iu = kmalloc(sizeof(*iu), gfp);
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if (!iu)
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goto free;
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usb_fill_bulk_urb(urb, udev, devinfo->status_pipe, iu, sizeof(*iu),
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uas_stat_cmplt, cmnd->device);
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urb->stream_id = stream_id;
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urb->transfer_flags |= URB_FREE_BUFFER;
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out:
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return urb;
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free:
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usb_free_urb(urb);
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return NULL;
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}
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static struct urb *uas_alloc_cmd_urb(struct uas_dev_info *devinfo, gfp_t gfp,
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struct scsi_cmnd *cmnd, u16 stream_id)
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{
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struct usb_device *udev = devinfo->udev;
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struct scsi_device *sdev = cmnd->device;
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struct urb *urb = usb_alloc_urb(0, gfp);
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struct command_iu *iu;
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int len;
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if (!urb)
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goto out;
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len = cmnd->cmd_len - 16;
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if (len < 0)
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len = 0;
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len = ALIGN(len, 4);
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iu = kmalloc(sizeof(*iu) + len, gfp);
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if (!iu)
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goto free;
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iu->iu_id = IU_ID_COMMAND;
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iu->tag = cpu_to_be16(stream_id);
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if (sdev->ordered_tags && (cmnd->request->cmd_flags & REQ_HARDBARRIER))
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iu->prio_attr = UAS_ORDERED_TAG;
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else
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iu->prio_attr = UAS_SIMPLE_TAG;
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iu->len = len;
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int_to_scsilun(sdev->lun, &iu->lun);
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memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len);
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usb_fill_bulk_urb(urb, udev, devinfo->cmd_pipe, iu, sizeof(*iu) + len,
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usb_free_urb, NULL);
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urb->transfer_flags |= URB_FREE_BUFFER;
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out:
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return urb;
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free:
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usb_free_urb(urb);
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return NULL;
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}
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/*
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* Why should I request the Status IU before sending the Command IU? Spec
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* says to, but also says the device may receive them in any order. Seems
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* daft to me.
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*/
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static int uas_submit_urbs(struct scsi_cmnd *cmnd,
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struct uas_dev_info *devinfo, gfp_t gfp)
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{
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struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
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if (cmdinfo->state & ALLOC_SENSE_URB) {
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cmdinfo->sense_urb = uas_alloc_sense_urb(devinfo, gfp, cmnd,
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cmdinfo->stream);
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if (!cmdinfo->sense_urb)
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return SCSI_MLQUEUE_DEVICE_BUSY;
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cmdinfo->state &= ~ALLOC_SENSE_URB;
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}
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if (cmdinfo->state & SUBMIT_SENSE_URB) {
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if (usb_submit_urb(cmdinfo->sense_urb, gfp)) {
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scmd_printk(KERN_INFO, cmnd,
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"sense urb submission failure\n");
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return SCSI_MLQUEUE_DEVICE_BUSY;
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}
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cmdinfo->state &= ~SUBMIT_SENSE_URB;
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}
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if (cmdinfo->state & ALLOC_DATA_IN_URB) {
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cmdinfo->data_in_urb = uas_alloc_data_urb(devinfo, gfp,
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devinfo->data_in_pipe, cmdinfo->stream,
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scsi_in(cmnd), DMA_FROM_DEVICE);
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if (!cmdinfo->data_in_urb)
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return SCSI_MLQUEUE_DEVICE_BUSY;
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cmdinfo->state &= ~ALLOC_DATA_IN_URB;
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}
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if (cmdinfo->state & SUBMIT_DATA_IN_URB) {
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if (usb_submit_urb(cmdinfo->data_in_urb, gfp)) {
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scmd_printk(KERN_INFO, cmnd,
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"data in urb submission failure\n");
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return SCSI_MLQUEUE_DEVICE_BUSY;
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}
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cmdinfo->state &= ~SUBMIT_DATA_IN_URB;
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}
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if (cmdinfo->state & ALLOC_DATA_OUT_URB) {
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cmdinfo->data_out_urb = uas_alloc_data_urb(devinfo, gfp,
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devinfo->data_out_pipe, cmdinfo->stream,
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scsi_out(cmnd), DMA_TO_DEVICE);
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if (!cmdinfo->data_out_urb)
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return SCSI_MLQUEUE_DEVICE_BUSY;
|
||||
cmdinfo->state &= ~ALLOC_DATA_OUT_URB;
|
||||
}
|
||||
|
||||
if (cmdinfo->state & SUBMIT_DATA_OUT_URB) {
|
||||
if (usb_submit_urb(cmdinfo->data_out_urb, gfp)) {
|
||||
scmd_printk(KERN_INFO, cmnd,
|
||||
"data out urb submission failure\n");
|
||||
return SCSI_MLQUEUE_DEVICE_BUSY;
|
||||
}
|
||||
cmdinfo->state &= ~SUBMIT_DATA_OUT_URB;
|
||||
}
|
||||
|
||||
if (cmdinfo->state & ALLOC_CMD_URB) {
|
||||
cmdinfo->cmd_urb = uas_alloc_cmd_urb(devinfo, gfp, cmnd,
|
||||
cmdinfo->stream);
|
||||
if (!cmdinfo->cmd_urb)
|
||||
return SCSI_MLQUEUE_DEVICE_BUSY;
|
||||
cmdinfo->state &= ~ALLOC_CMD_URB;
|
||||
}
|
||||
|
||||
if (cmdinfo->state & SUBMIT_CMD_URB) {
|
||||
if (usb_submit_urb(cmdinfo->cmd_urb, gfp)) {
|
||||
scmd_printk(KERN_INFO, cmnd,
|
||||
"cmd urb submission failure\n");
|
||||
return SCSI_MLQUEUE_DEVICE_BUSY;
|
||||
}
|
||||
cmdinfo->state &= ~SUBMIT_CMD_URB;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int uas_queuecommand(struct scsi_cmnd *cmnd,
|
||||
void (*done)(struct scsi_cmnd *))
|
||||
{
|
||||
struct scsi_device *sdev = cmnd->device;
|
||||
struct uas_dev_info *devinfo = sdev->hostdata;
|
||||
struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
|
||||
int err;
|
||||
|
||||
BUILD_BUG_ON(sizeof(struct uas_cmd_info) > sizeof(struct scsi_pointer));
|
||||
|
||||
if (!cmdinfo->sense_urb && sdev->current_cmnd)
|
||||
return SCSI_MLQUEUE_DEVICE_BUSY;
|
||||
|
||||
if (blk_rq_tagged(cmnd->request)) {
|
||||
cmdinfo->stream = cmnd->request->tag + 1;
|
||||
} else {
|
||||
sdev->current_cmnd = cmnd;
|
||||
cmdinfo->stream = 1;
|
||||
}
|
||||
|
||||
cmnd->scsi_done = done;
|
||||
|
||||
cmdinfo->state = ALLOC_SENSE_URB | SUBMIT_SENSE_URB |
|
||||
ALLOC_CMD_URB | SUBMIT_CMD_URB;
|
||||
|
||||
switch (cmnd->sc_data_direction) {
|
||||
case DMA_FROM_DEVICE:
|
||||
cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
|
||||
break;
|
||||
case DMA_BIDIRECTIONAL:
|
||||
cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
|
||||
case DMA_TO_DEVICE:
|
||||
cmdinfo->state |= ALLOC_DATA_OUT_URB | SUBMIT_DATA_OUT_URB;
|
||||
case DMA_NONE:
|
||||
break;
|
||||
}
|
||||
|
||||
if (!devinfo->use_streams) {
|
||||
cmdinfo->state &= ~(SUBMIT_DATA_IN_URB | SUBMIT_DATA_OUT_URB);
|
||||
cmdinfo->stream = 0;
|
||||
}
|
||||
|
||||
err = uas_submit_urbs(cmnd, devinfo, GFP_ATOMIC);
|
||||
if (err) {
|
||||
/* If we did nothing, give up now */
|
||||
if (cmdinfo->state & SUBMIT_SENSE_URB) {
|
||||
usb_free_urb(cmdinfo->sense_urb);
|
||||
return SCSI_MLQUEUE_DEVICE_BUSY;
|
||||
}
|
||||
spin_lock(&uas_work_lock);
|
||||
list_add_tail(&cmdinfo->list, &uas_work_list);
|
||||
spin_unlock(&uas_work_lock);
|
||||
schedule_work(&uas_work);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int uas_eh_abort_handler(struct scsi_cmnd *cmnd)
|
||||
{
|
||||
struct scsi_device *sdev = cmnd->device;
|
||||
sdev_printk(KERN_INFO, sdev, "%s tag %d\n", __func__,
|
||||
cmnd->request->tag);
|
||||
|
||||
/* XXX: Send ABORT TASK Task Management command */
|
||||
return FAILED;
|
||||
}
|
||||
|
||||
static int uas_eh_device_reset_handler(struct scsi_cmnd *cmnd)
|
||||
{
|
||||
struct scsi_device *sdev = cmnd->device;
|
||||
sdev_printk(KERN_INFO, sdev, "%s tag %d\n", __func__,
|
||||
cmnd->request->tag);
|
||||
|
||||
/* XXX: Send LOGICAL UNIT RESET Task Management command */
|
||||
return FAILED;
|
||||
}
|
||||
|
||||
static int uas_eh_target_reset_handler(struct scsi_cmnd *cmnd)
|
||||
{
|
||||
struct scsi_device *sdev = cmnd->device;
|
||||
sdev_printk(KERN_INFO, sdev, "%s tag %d\n", __func__,
|
||||
cmnd->request->tag);
|
||||
|
||||
/* XXX: Can we reset just the one USB interface?
|
||||
* Would calling usb_set_interface() have the right effect?
|
||||
*/
|
||||
return FAILED;
|
||||
}
|
||||
|
||||
static int uas_eh_bus_reset_handler(struct scsi_cmnd *cmnd)
|
||||
{
|
||||
struct scsi_device *sdev = cmnd->device;
|
||||
struct uas_dev_info *devinfo = sdev->hostdata;
|
||||
struct usb_device *udev = devinfo->udev;
|
||||
|
||||
sdev_printk(KERN_INFO, sdev, "%s tag %d\n", __func__,
|
||||
cmnd->request->tag);
|
||||
|
||||
if (usb_reset_device(udev))
|
||||
return SUCCESS;
|
||||
|
||||
return FAILED;
|
||||
}
|
||||
|
||||
static int uas_slave_alloc(struct scsi_device *sdev)
|
||||
{
|
||||
sdev->hostdata = (void *)sdev->host->hostdata[0];
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int uas_slave_configure(struct scsi_device *sdev)
|
||||
{
|
||||
struct uas_dev_info *devinfo = sdev->hostdata;
|
||||
scsi_set_tag_type(sdev, MSG_ORDERED_TAG);
|
||||
scsi_activate_tcq(sdev, devinfo->qdepth - 1);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct scsi_host_template uas_host_template = {
|
||||
.module = THIS_MODULE,
|
||||
.name = "uas",
|
||||
.queuecommand = uas_queuecommand,
|
||||
.slave_alloc = uas_slave_alloc,
|
||||
.slave_configure = uas_slave_configure,
|
||||
.eh_abort_handler = uas_eh_abort_handler,
|
||||
.eh_device_reset_handler = uas_eh_device_reset_handler,
|
||||
.eh_target_reset_handler = uas_eh_target_reset_handler,
|
||||
.eh_bus_reset_handler = uas_eh_bus_reset_handler,
|
||||
.can_queue = 65536, /* Is there a limit on the _host_ ? */
|
||||
.this_id = -1,
|
||||
.sg_tablesize = SG_NONE,
|
||||
.cmd_per_lun = 1, /* until we override it */
|
||||
.skip_settle_delay = 1,
|
||||
.ordered_tag = 1,
|
||||
};
|
||||
|
||||
static struct usb_device_id uas_usb_ids[] = {
|
||||
{ USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_BULK) },
|
||||
{ USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_UAS) },
|
||||
/* 0xaa is a prototype device I happen to have access to */
|
||||
{ USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, 0xaa) },
|
||||
{ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(usb, uas_usb_ids);
|
||||
|
||||
static void uas_configure_endpoints(struct uas_dev_info *devinfo)
|
||||
{
|
||||
struct usb_host_endpoint *eps[4] = { };
|
||||
struct usb_interface *intf = devinfo->intf;
|
||||
struct usb_device *udev = devinfo->udev;
|
||||
struct usb_host_endpoint *endpoint = intf->cur_altsetting->endpoint;
|
||||
unsigned i, n_endpoints = intf->cur_altsetting->desc.bNumEndpoints;
|
||||
|
||||
devinfo->uas_sense_old = 0;
|
||||
|
||||
for (i = 0; i < n_endpoints; i++) {
|
||||
unsigned char *extra = endpoint[i].extra;
|
||||
int len = endpoint[i].extralen;
|
||||
while (len > 1) {
|
||||
if (extra[1] == USB_DT_PIPE_USAGE) {
|
||||
unsigned pipe_id = extra[2];
|
||||
if (pipe_id > 0 && pipe_id < 5)
|
||||
eps[pipe_id - 1] = &endpoint[i];
|
||||
break;
|
||||
}
|
||||
len -= extra[0];
|
||||
extra += extra[0];
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Assume that if we didn't find a control pipe descriptor, we're
|
||||
* using a device with old firmware that happens to be set up like
|
||||
* this.
|
||||
*/
|
||||
if (!eps[0]) {
|
||||
devinfo->cmd_pipe = usb_sndbulkpipe(udev, 1);
|
||||
devinfo->status_pipe = usb_rcvbulkpipe(udev, 1);
|
||||
devinfo->data_in_pipe = usb_rcvbulkpipe(udev, 2);
|
||||
devinfo->data_out_pipe = usb_sndbulkpipe(udev, 2);
|
||||
|
||||
eps[1] = usb_pipe_endpoint(udev, devinfo->status_pipe);
|
||||
eps[2] = usb_pipe_endpoint(udev, devinfo->data_in_pipe);
|
||||
eps[3] = usb_pipe_endpoint(udev, devinfo->data_out_pipe);
|
||||
} else {
|
||||
devinfo->cmd_pipe = usb_sndbulkpipe(udev,
|
||||
eps[0]->desc.bEndpointAddress);
|
||||
devinfo->status_pipe = usb_rcvbulkpipe(udev,
|
||||
eps[1]->desc.bEndpointAddress);
|
||||
devinfo->data_in_pipe = usb_rcvbulkpipe(udev,
|
||||
eps[2]->desc.bEndpointAddress);
|
||||
devinfo->data_out_pipe = usb_sndbulkpipe(udev,
|
||||
eps[3]->desc.bEndpointAddress);
|
||||
}
|
||||
|
||||
devinfo->qdepth = usb_alloc_streams(devinfo->intf, eps + 1, 3, 256,
|
||||
GFP_KERNEL);
|
||||
if (devinfo->qdepth < 0) {
|
||||
devinfo->qdepth = 256;
|
||||
devinfo->use_streams = 0;
|
||||
} else {
|
||||
devinfo->use_streams = 1;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* XXX: What I'd like to do here is register a SCSI host for each USB host in
|
||||
* the system. Follow usb-storage's design of registering a SCSI host for
|
||||
* each USB device for the moment. Can implement this by walking up the
|
||||
* USB hierarchy until we find a USB host.
|
||||
*/
|
||||
static int uas_probe(struct usb_interface *intf, const struct usb_device_id *id)
|
||||
{
|
||||
int result;
|
||||
struct Scsi_Host *shost;
|
||||
struct uas_dev_info *devinfo;
|
||||
struct usb_device *udev = interface_to_usbdev(intf);
|
||||
|
||||
if (id->bInterfaceProtocol == 0x50) {
|
||||
int ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
|
||||
/* XXX: Shouldn't assume that 1 is the alternative we want */
|
||||
int ret = usb_set_interface(udev, ifnum, 1);
|
||||
if (ret)
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
devinfo = kmalloc(sizeof(struct uas_dev_info), GFP_KERNEL);
|
||||
if (!devinfo)
|
||||
return -ENOMEM;
|
||||
|
||||
result = -ENOMEM;
|
||||
shost = scsi_host_alloc(&uas_host_template, sizeof(void *));
|
||||
if (!shost)
|
||||
goto free;
|
||||
|
||||
shost->max_cmd_len = 16 + 252;
|
||||
shost->max_id = 1;
|
||||
shost->sg_tablesize = udev->bus->sg_tablesize;
|
||||
|
||||
result = scsi_add_host(shost, &intf->dev);
|
||||
if (result)
|
||||
goto free;
|
||||
shost->hostdata[0] = (unsigned long)devinfo;
|
||||
|
||||
devinfo->intf = intf;
|
||||
devinfo->udev = udev;
|
||||
uas_configure_endpoints(devinfo);
|
||||
|
||||
scsi_scan_host(shost);
|
||||
usb_set_intfdata(intf, shost);
|
||||
return result;
|
||||
free:
|
||||
kfree(devinfo);
|
||||
if (shost)
|
||||
scsi_host_put(shost);
|
||||
return result;
|
||||
}
|
||||
|
||||
static int uas_pre_reset(struct usb_interface *intf)
|
||||
{
|
||||
/* XXX: Need to return 1 if it's not our device in error handling */
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int uas_post_reset(struct usb_interface *intf)
|
||||
{
|
||||
/* XXX: Need to return 1 if it's not our device in error handling */
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void uas_disconnect(struct usb_interface *intf)
|
||||
{
|
||||
struct usb_device *udev = interface_to_usbdev(intf);
|
||||
struct usb_host_endpoint *eps[3];
|
||||
struct Scsi_Host *shost = usb_get_intfdata(intf);
|
||||
struct uas_dev_info *devinfo = (void *)shost->hostdata[0];
|
||||
|
||||
scsi_remove_host(shost);
|
||||
|
||||
eps[0] = usb_pipe_endpoint(udev, devinfo->status_pipe);
|
||||
eps[1] = usb_pipe_endpoint(udev, devinfo->data_in_pipe);
|
||||
eps[2] = usb_pipe_endpoint(udev, devinfo->data_out_pipe);
|
||||
usb_free_streams(intf, eps, 3, GFP_KERNEL);
|
||||
|
||||
kfree(devinfo);
|
||||
}
|
||||
|
||||
/*
|
||||
* XXX: Should this plug into libusual so we can auto-upgrade devices from
|
||||
* Bulk-Only to UAS?
|
||||
*/
|
||||
static struct usb_driver uas_driver = {
|
||||
.name = "uas",
|
||||
.probe = uas_probe,
|
||||
.disconnect = uas_disconnect,
|
||||
.pre_reset = uas_pre_reset,
|
||||
.post_reset = uas_post_reset,
|
||||
.id_table = uas_usb_ids,
|
||||
};
|
||||
|
||||
static int uas_init(void)
|
||||
{
|
||||
return usb_register(&uas_driver);
|
||||
}
|
||||
|
||||
static void uas_exit(void)
|
||||
{
|
||||
usb_deregister(&uas_driver);
|
||||
}
|
||||
|
||||
module_init(uas_init);
|
||||
module_exit(uas_exit);
|
||||
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_AUTHOR("Matthew Wilcox and Sarah Sharp");
|
||||
Loading…
Reference in a new issue