hpusbscsi.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:12k
- #include <linux/module.h>
- #include <linux/kernel.h>
- #include <linux/sched.h>
- #include <linux/signal.h>
- #include <linux/errno.h>
- #include <linux/init.h>
- #include <linux/slab.h>
- #include <linux/spinlock.h>
- #include <linux/smp_lock.h>
- #include <linux/usb.h>
- #include <asm/atomic.h>
- #include <linux/blk.h>
- #include "../scsi/scsi.h"
- #include "../scsi/hosts.h"
- #include "../scsi/sd.h"
- #include "hpusbscsi.h"
- #define DEBUG(x...)
- printk( KERN_DEBUG x )
- static char *states[]={"FREE", "BEGINNING", "WORKING", "ERROR", "WAIT", "PREMATURE"};
- #define TRACE_STATE printk(KERN_DEBUG"hpusbscsi->state = %s at line %dn", states[hpusbscsi->state], __LINE__)
- /* global variables */
- struct list_head hpusbscsi_devices;
- //LIST_HEAD(hpusbscsi_devices);
- /* USB related parts */
- static void *
- hpusbscsi_usb_probe (struct usb_device *dev, unsigned int interface,
- const struct usb_device_id *id)
- {
- struct hpusbscsi *new;
- struct usb_interface_descriptor *altsetting =
- &(dev->actconfig->interface[interface].altsetting[0]);
- int i, result;
- /* basic check */
- if (altsetting->bNumEndpoints != 3) {
- printk (KERN_ERR "Wrong number of endpointsn");
- return NULL;
- }
- /* descriptor allocation */
- new =
- (struct hpusbscsi *) kmalloc (sizeof (struct hpusbscsi),
- GFP_KERNEL);
- if (new == NULL)
- return NULL;
- DEBUG ("Allocated memoryn");
- memset (new, 0, sizeof (struct hpusbscsi));
- spin_lock_init (&new->dataurb.lock);
- spin_lock_init (&new->controlurb.lock);
- new->dev = dev;
- init_waitqueue_head (&new->pending);
- init_waitqueue_head (&new->deathrow);
- INIT_LIST_HEAD (&new->lh);
- /* finding endpoints */
- for (i = 0; i < altsetting->bNumEndpoints; i++) {
- if (
- (altsetting->endpoint[i].
- bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
- USB_ENDPOINT_XFER_BULK) {
- if (altsetting->endpoint[i].
- bEndpointAddress & USB_DIR_IN) {
- new->ep_in =
- altsetting->endpoint[i].
- bEndpointAddress &
- USB_ENDPOINT_NUMBER_MASK;
- } else {
- new->ep_out =
- altsetting->endpoint[i].
- bEndpointAddress &
- USB_ENDPOINT_NUMBER_MASK;
- }
- } else {
- new->ep_int =
- altsetting->endpoint[i].
- bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
- new->interrupt_interval= altsetting->endpoint[i].bInterval;
- }
- }
- /* USB initialisation magic for the simple case */
- result = usb_set_interface (dev, altsetting->bInterfaceNumber, 0);
- switch (result) {
- case 0: /* no error */
- break;
- case -EPIPE:
- usb_clear_halt (dev, usb_sndctrlpipe (dev, 0));
- break;
- default:
- printk (KERN_ERR "unknown error %d from usb_set_interfacen",
- result);
- goto err_out;
- }
- /* making a template for the scsi layer to fake detection of a scsi device */
- memcpy (&(new->ctempl), &hpusbscsi_scsi_host_template,
- sizeof (hpusbscsi_scsi_host_template));
- (struct hpusbscsi *) new->ctempl.proc_dir = new;
- new->ctempl.module = THIS_MODULE;
- if (scsi_register_module (MODULE_SCSI_HA, &(new->ctempl)))
- goto err_out;
- /* adding to list for module unload */
- list_add (&hpusbscsi_devices, &new->lh);
- return new;
- err_out:
- kfree (new);
- return NULL;
- }
- static void
- hpusbscsi_usb_disconnect (struct usb_device *dev, void *ptr)
- {
- usb_unlink_urb(&(((struct hpusbscsi *) ptr)->controlurb));
- ((struct hpusbscsi *) ptr)->dev = NULL;
- }
- static struct usb_device_id hpusbscsi_usb_ids[] = {
- {USB_DEVICE (0x03f0, 0x0701)}, /* HP 53xx */
- {USB_DEVICE (0x03f0, 0x0801)}, /* HP 7400 */
- {USB_DEVICE (0x0638, 0x026a)}, /*Scan Dual II */
- {} /* Terminating entry */
- };
- MODULE_DEVICE_TABLE (usb, hpusbscsi_usb_ids);
- MODULE_LICENSE("GPL");
- static struct usb_driver hpusbscsi_usb_driver = {
- name:"hpusbscsi",
- probe:hpusbscsi_usb_probe,
- disconnect:hpusbscsi_usb_disconnect,
- id_table:hpusbscsi_usb_ids,
- };
- /* module initialisation */
- int __init
- hpusbscsi_init (void)
- {
- int result;
- INIT_LIST_HEAD (&hpusbscsi_devices);
- DEBUG ("Driver loadedn");
- if ((result = usb_register (&hpusbscsi_usb_driver)) < 0) {
- printk (KERN_ERR "hpusbscsi: driver registration failedn");
- return -1;
- } else {
- return 0;
- }
- }
- void __exit
- hpusbscsi_exit (void)
- {
- struct list_head *tmp;
- struct list_head *old;
- struct hpusbscsi * o;
- for (tmp = hpusbscsi_devices.next; tmp != &hpusbscsi_devices;/*nothing */) {
- old = tmp;
- tmp = tmp->next;
- o = (struct hpusbscsi *)old;
- usb_unlink_urb(&o->controlurb);
- scsi_unregister_module(MODULE_SCSI_HA,&o->ctempl);
- kfree(old);
- }
- usb_deregister (&hpusbscsi_usb_driver);
- }
- module_init (hpusbscsi_init);
- module_exit (hpusbscsi_exit);
- /* interface to the scsi layer */
- static int
- hpusbscsi_scsi_detect (struct SHT *sht)
- {
- /* Whole function stolen from usb-storage */
- struct hpusbscsi *desc = (struct hpusbscsi *) sht->proc_dir;
- /* What a hideous hack! */
- char local_name[48];
- /* set up the name of our subdirectory under /proc/scsi/ */
- sprintf (local_name, "hpusbscsi-%d", desc->number);
- sht->proc_name = kmalloc (strlen (local_name) + 1, GFP_KERNEL);
- /* FIXME: where is this freed ? */
- if (!sht->proc_name) {
- return 0;
- }
- strcpy (sht->proc_name, local_name);
- sht->proc_dir = NULL;
- /* build and submit an interrupt URB for status byte handling */
- FILL_INT_URB(&desc->controlurb,
- desc->dev,
- usb_rcvintpipe(desc->dev,desc->ep_int),
- &desc->scsi_state_byte,
- 1,
- control_interrupt_callback,
- desc,
- desc->interrupt_interval
- );
- if ( 0 > usb_submit_urb(&desc->controlurb)) {
- kfree(sht->proc_name);
- return 0;
- }
- /* In host->hostdata we store a pointer to desc */
- desc->host = scsi_register (sht, sizeof (desc));
- if (desc->host == NULL) {
- kfree (sht->proc_name);
- usb_unlink_urb(&desc->controlurb);
- return 0;
- }
- desc->host->hostdata[0] = (unsigned long) desc;
- return 1;
- }
- static int hpusbscsi_scsi_queuecommand (Scsi_Cmnd *srb, scsi_callback callback)
- {
- struct hpusbscsi* hpusbscsi = (struct hpusbscsi*)(srb->host->hostdata[0]);
- usb_urb_callback usb_callback;
- int res;
- hpusbscsi->use_count++;
- /* we don't answer for anything but our single device on any faked host controller */
- if ( srb->device->lun || srb->device->id || srb->device->channel ) {
- if (callback) {
- srb->result = DID_BAD_TARGET;
- callback(srb);
- }
- goto out;
- }
- /* Now we need to decide which callback to give to the urb we send the command with */
- if (!srb->bufflen) {
- usb_callback = simple_command_callback;
- } else {
- if (srb->use_sg) {
- usb_callback = scatter_gather_callback;
- hpusbscsi->fragment = 0;
- } else {
- usb_callback = simple_payload_callback;
- }
- /* Now we find out which direction data is to be transfered in */
- hpusbscsi->current_data_pipe = DIRECTION_IS_IN(srb->cmnd[0]) ?
- usb_rcvbulkpipe(hpusbscsi->dev, hpusbscsi->ep_in)
- :
- usb_sndbulkpipe(hpusbscsi->dev, hpusbscsi->ep_out)
- ;
- }
- TRACE_STATE;
- if (hpusbscsi->state != HP_STATE_FREE) {
- printk(KERN_CRIT"hpusbscsi - Ouch: queueing violation!n");
- return 1; /* This must not happen */
- }
- /* We zero the sense buffer to avoid confusing user space */
- memset(srb->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
- hpusbscsi->state = HP_STATE_BEGINNING;
- TRACE_STATE;
- /* We prepare the urb for writing out the scsi command */
- FILL_BULK_URB(
- &hpusbscsi->dataurb,
- hpusbscsi->dev,
- usb_sndbulkpipe(hpusbscsi->dev,hpusbscsi->ep_out),
- srb->cmnd,
- srb->cmd_len,
- usb_callback,
- hpusbscsi
- );
- hpusbscsi->scallback = callback;
- hpusbscsi->srb = srb;
- res = usb_submit_urb(&hpusbscsi->dataurb);
- if (res) {
- hpusbscsi->state = HP_STATE_FREE;
- TRACE_STATE;
- if (callback) {
- srb->result = DID_ERROR;
- callback(srb);
- }
- }
- out:
- hpusbscsi->use_count--;
- return 0;
- }
- static int hpusbscsi_scsi_host_reset (Scsi_Cmnd *srb)
- {
- struct hpusbscsi* hpusbscsi = (struct hpusbscsi*)(srb->host->hostdata[0]);
- printk(KERN_DEBUG"SCSI reset requested.n");
- usb_reset_device(hpusbscsi->dev);
- printk(KERN_DEBUG"SCSI reset completed.n");
- hpusbscsi->state = HP_STATE_FREE;
- return 0;
- }
- static int hpusbscsi_scsi_abort (Scsi_Cmnd *srb)
- {
- struct hpusbscsi* hpusbscsi = (struct hpusbscsi*)(srb->host->hostdata[0]);
- printk(KERN_DEBUG"Requested is canceled.n");
- usb_unlink_urb(&hpusbscsi->dataurb);
- usb_unlink_urb(&hpusbscsi->controlurb);
- hpusbscsi->state = HP_STATE_FREE;
- return SCSI_ABORT_PENDING;
- }
- /* usb interrupt handlers - they are all running IN INTERRUPT ! */
- static void handle_usb_error (struct hpusbscsi *hpusbscsi)
- {
- if (hpusbscsi->scallback != NULL) {
- hpusbscsi->srb->result = DID_ERROR;
- hpusbscsi->scallback(hpusbscsi->srb);
- }
- hpusbscsi->state = HP_STATE_FREE;
- }
- static void control_interrupt_callback (struct urb *u)
- {
- struct hpusbscsi * hpusbscsi = (struct hpusbscsi *)u->context;
- DEBUG("Getting status byte %d n",hpusbscsi->scsi_state_byte);
- if(u->status < 0) {
- if (hpusbscsi->state != HP_STATE_FREE)
- handle_usb_error(hpusbscsi);
- return;
- }
- hpusbscsi->srb->result &= SCSI_ERR_MASK;
- hpusbscsi->srb->result |= hpusbscsi->scsi_state_byte<<1;
- if (hpusbscsi->scallback != NULL && hpusbscsi->state == HP_STATE_WAIT)
- /* we do a callback to the scsi layer if and only if all data has been transfered */
- hpusbscsi->scallback(hpusbscsi->srb);
- TRACE_STATE;
- switch (hpusbscsi->state) {
- case HP_STATE_WAIT:
- hpusbscsi->state = HP_STATE_FREE;
- TRACE_STATE;
- break;
- case HP_STATE_WORKING:
- case HP_STATE_BEGINNING:
- hpusbscsi->state = HP_STATE_PREMATURE;
- TRACE_STATE;
- break;
- default:
- printk(KERN_ERR"hpusbscsi: Unexpected status report.n");
- TRACE_STATE;
- hpusbscsi->state = HP_STATE_FREE;
- TRACE_STATE;
- break;
- }
- }
- static void simple_command_callback(struct urb *u)
- {
- struct hpusbscsi * hpusbscsi = (struct hpusbscsi *)u->context;
- if (u->status<0) {
- handle_usb_error(hpusbscsi);
- return;
- }
- TRACE_STATE;
- if (hpusbscsi->state != HP_STATE_PREMATURE) {
- TRACE_STATE;
- hpusbscsi->state = HP_STATE_WAIT;
- } else {
- if (hpusbscsi->scallback != NULL)
- hpusbscsi->scallback(hpusbscsi->srb);
- hpusbscsi->state = HP_STATE_FREE;
- TRACE_STATE;
- }
- }
- static void scatter_gather_callback(struct urb *u)
- {
- struct hpusbscsi * hpusbscsi = (struct hpusbscsi *)u->context;
- struct scatterlist *sg = hpusbscsi->srb->buffer;
- usb_urb_callback callback;
- int res;
- DEBUG("Going through scatter/gathern");
- if (u->status < 0) {
- handle_usb_error(hpusbscsi);
- return;
- }
- if (hpusbscsi->fragment + 1 != hpusbscsi->srb->use_sg)
- callback = scatter_gather_callback;
- else
- callback = simple_done;
- TRACE_STATE;
- if (hpusbscsi->state != HP_STATE_PREMATURE)
- hpusbscsi->state = HP_STATE_WORKING;
- TRACE_STATE;
- FILL_BULK_URB(
- u,
- hpusbscsi->dev,
- hpusbscsi->current_data_pipe,
- sg[hpusbscsi->fragment].address,
- sg[hpusbscsi->fragment++].length,
- callback,
- hpusbscsi
- );
- res = usb_submit_urb(u);
- if (res)
- hpusbscsi->state = HP_STATE_ERROR;
- TRACE_STATE;
- }
- static void simple_done (struct urb *u)
- {
- struct hpusbscsi * hpusbscsi = (struct hpusbscsi *)u->context;
- if (u->status < 0) {
- handle_usb_error(hpusbscsi);
- return;
- }
- DEBUG("Data transfer donen");
- TRACE_STATE;
- if (hpusbscsi->state != HP_STATE_PREMATURE) {
- if (u->status < 0)
- hpusbscsi->state = HP_STATE_ERROR;
- else
- hpusbscsi->state = HP_STATE_WAIT;
- TRACE_STATE;
- } else {
- if (hpusbscsi->scallback != NULL)
- hpusbscsi->scallback(hpusbscsi->srb);
- hpusbscsi->state = HP_STATE_FREE;
- }
- }
- static void simple_payload_callback (struct urb *u)
- {
- struct hpusbscsi * hpusbscsi = (struct hpusbscsi *)u->context;
- int res;
- if (u->status<0) {
- handle_usb_error(hpusbscsi);
- return;
- }
- FILL_BULK_URB(
- u,
- hpusbscsi->dev,
- hpusbscsi->current_data_pipe,
- hpusbscsi->srb->buffer,
- hpusbscsi->srb->bufflen,
- simple_done,
- hpusbscsi
- );
- res = usb_submit_urb(u);
- if (res) {
- handle_usb_error(hpusbscsi);
- return;
- }
- TRACE_STATE;
- if (hpusbscsi->state != HP_STATE_PREMATURE) {
- hpusbscsi->state = HP_STATE_WORKING;
- TRACE_STATE;
- } else {
- if (hpusbscsi->scallback != NULL)
- hpusbscsi->scallback(hpusbscsi->srb);
- hpusbscsi->state = HP_STATE_FREE;
- TRACE_STATE;
- }
- }