USB hpusbscsi driver

Port changes from 2.4:
  We do request_sense ourselves to comply with
  the scanner command set

drivers/usb/hpusbscsi.c

@@ -129,6 +129,9 @@ hpusbscsi_usb_probe (struct usb_device *dev, unsigned int interface,
 	if (scsi_register_host(&new->ctempl))
 		goto err_out;
 
+	new->sense_command[0] = REQUEST_SENSE;
+	new->sense_command[4] = HPUSBSCSI_SENSE_LENGTH;
+
 	/* adding to list for module unload */
 	list_add (&hpusbscsi_devices, &new->lh);
 
@@ -379,6 +382,7 @@ static void handle_usb_error (struct hpusbscsi *hpusbscsi)
 static void  control_interrupt_callback (struct urb *u)
 {
 	struct hpusbscsi * hpusbscsi = (struct hpusbscsi *)u->context;
+	u8 scsi_state;
 
 DEBUG("Getting status byte %d \n",hpusbscsi->scsi_state_byte);
 	if(unlikely(u->status < 0)) {
@@ -386,10 +390,23 @@ DEBUG("Getting status byte %d \n",hpusbscsi->scsi_state_byte);
                         handle_usb_error(hpusbscsi);
 		return;
 	}
-	hpusbscsi->srb->result &= SCSI_ERR_MASK;
-	hpusbscsi->srb->result |= hpusbscsi->scsi_state_byte;
 
-	if (hpusbscsi->scallback != NULL && hpusbscsi->state == HP_STATE_WAIT)
+	scsi_state = hpusbscsi->scsi_state_byte;
+	if (hpusbscsi->state != HP_STATE_ERROR) {
+		hpusbscsi->srb->result &= SCSI_ERR_MASK;
+		hpusbscsi->srb->result |= scsi_state;
+	}
+
+	if (scsi_state == CHECK_CONDITION << 1) {
+		if (hpusbscsi->state == HP_STATE_WAIT) {
+			issue_request_sense(hpusbscsi);
+		} else {
+			/* we request sense after an eventual data transfer */
+			hpusbscsi->state = HP_STATE_ERROR;
+		}
+	}
+
+	if (hpusbscsi->scallback != NULL && hpusbscsi->state == HP_STATE_WAIT && scsi_state != CHECK_CONDITION <<1 )
 		/* we do a callback to the scsi layer if and only if all data has been transfered */
 		hpusbscsi->scallback(hpusbscsi->srb);
 
@@ -404,6 +421,8 @@ DEBUG("Getting status byte %d \n",hpusbscsi->scsi_state_byte);
 		hpusbscsi->state = HP_STATE_PREMATURE;
 	TRACE_STATE;
 		break;
+	case HP_STATE_ERROR:
+		break;
 	default:
 		printk(KERN_ERR"hpusbscsi: Unexpected status report.\n");
 	TRACE_STATE;
@@ -432,32 +451,6 @@ static void simple_command_callback(struct urb *u)
 	}
 }
 
-static void request_sense_callback (struct urb *u)
-{
-	struct hpusbscsi * hpusbscsi = (struct hpusbscsi *)u->context;
-
-	if (unlikely(u->status<0)) {
-		handle_usb_error(hpusbscsi);
-		return;
-        }
-
-	FILL_BULK_URB(
-		u,
-		hpusbscsi->dev,
-		hpusbscsi->current_data_pipe,
-		hpusbscsi->srb->sense_buffer,
-		SCSI_SENSE_BUFFERSIZE,
-		simple_done,
-		hpusbscsi
-	);
-
-	if (unlikely(0 > usb_submit_urb(u, GFP_ATOMIC))) {
-		handle_usb_error(hpusbscsi);
-		return;
-	}
-	hpusbscsi->state = HP_STATE_WORKING;
-}
-
 static void scatter_gather_callback(struct urb *u)
 {
 	struct hpusbscsi * hpusbscsi = (struct hpusbscsi *)u->context;
@@ -494,7 +487,7 @@ static void scatter_gather_callback(struct urb *u)
 
         res = usb_submit_urb(u, GFP_ATOMIC);
         if (unlikely(res))
-                hpusbscsi->state = HP_STATE_ERROR;
+                handle_usb_error(hpusbscsi);
 	TRACE_STATE;
 }
 
@@ -509,11 +502,15 @@ static void simple_done (struct urb *u)
         DEBUG("Data transfer done\n");
 	TRACE_STATE;
 	if (hpusbscsi->state != HP_STATE_PREMATURE) {
-		if (unlikely(u->status < 0))
-			hpusbscsi->state = HP_STATE_ERROR;
-		else
-			hpusbscsi->state = HP_STATE_WAIT;
-		TRACE_STATE;
+		if (unlikely(u->status < 0)) {
+			handle_usb_error(hpusbscsi);
+		} else {
+			if (hpusbscsi->state != HP_STATE_ERROR) {
+				hpusbscsi->state = HP_STATE_WAIT;
+			} else {
+				issue_request_sense(hpusbscsi);
+			}			
+		}
 	} else {
 		if (likely(hpusbscsi->scallback != NULL))
 			hpusbscsi->scallback(hpusbscsi->srb);
@@ -550,12 +547,52 @@ static void simple_payload_callback (struct urb *u)
 	if (hpusbscsi->state != HP_STATE_PREMATURE) {
 		hpusbscsi->state = HP_STATE_WORKING;
 	TRACE_STATE;
-	} else {
-		if (likely(hpusbscsi->scallback != NULL))
-			hpusbscsi->scallback(hpusbscsi->srb);
-		hpusbscsi->state = HP_STATE_FREE;
-	TRACE_STATE;
+	} 
+}
+
+static void request_sense_callback (struct urb *u)
+{
+	struct hpusbscsi * hpusbscsi = (struct hpusbscsi *)u->context;
+
+	if (u->status<0) {
+                handle_usb_error(hpusbscsi);
+		return;
+        }
+
+	FILL_BULK_URB(
+		u,
+		hpusbscsi->dev,
+		hpusbscsi->current_data_pipe,
+		hpusbscsi->srb->sense_buffer,
+		SCSI_SENSE_BUFFERSIZE,
+		simple_done,
+		hpusbscsi
+	);
+
+	if (0 > usb_submit_urb(u, GFP_ATOMIC)) {
+		handle_usb_error(hpusbscsi);
+		return;
 	}
+	if (hpusbscsi->state != HP_STATE_PREMATURE && hpusbscsi->state != HP_STATE_ERROR)
+		hpusbscsi->state = HP_STATE_WORKING;
 }
 
+static void issue_request_sense (struct hpusbscsi *hpusbscsi)
+{
+	FILL_BULK_URB(
+		hpusbscsi->dataurb,
+		hpusbscsi->dev,
+		usb_sndbulkpipe(hpusbscsi->dev, hpusbscsi->ep_out),
+		&hpusbscsi->sense_command,
+		SENSE_COMMAND_SIZE,
+		request_sense_callback,
+		hpusbscsi
+	);
+
+	hpusbscsi->current_data_pipe = usb_rcvbulkpipe(hpusbscsi->dev, hpusbscsi->ep_in);
+
+	if (0 > usb_submit_urb(hpusbscsi->dataurb, GFP_ATOMIC)) {
+		handle_usb_error(hpusbscsi);
+	}
+}
 

drivers/usb/hpusbscsi.h

@@ -4,9 +4,14 @@
 /* large parts based on or taken from code by John Fremlin and Matt Dharm */
 /* this file is licensed under the GPL */
 
+/* A big thanks to Jose for untiring testing */
+
 typedef void (*usb_urb_callback) (struct urb *);
 typedef void (*scsi_callback)(Scsi_Cmnd *);
 
+#define SENSE_COMMAND_SIZE 6
+#define HPUSBSCSI_SENSE_LENGTH 0x16
+
 struct hpusbscsi
 {
         struct list_head lh;
@@ -19,8 +24,9 @@ struct hpusbscsi
         struct Scsi_Host *host;
         Scsi_Host_Template ctempl;
         int number;
-       scsi_callback scallback;
-       Scsi_Cmnd *srb;
+	scsi_callback scallback;
+	Scsi_Cmnd *srb;
+	u8 sense_command[SENSE_COMMAND_SIZE];
 
         int use_count;
         wait_queue_head_t pending;
@@ -57,6 +63,7 @@ static void simple_done (struct urb *u);
 static int hpusbscsi_scsi_queuecommand (Scsi_Cmnd *srb, scsi_callback callback);
 static int hpusbscsi_scsi_host_reset (Scsi_Cmnd *srb);
 static int hpusbscsi_scsi_abort (Scsi_Cmnd *srb);
+static void issue_request_sense (struct hpusbscsi *hpusbscsi);
 
 static Scsi_Host_Template hpusbscsi_scsi_host_template = {
 	name:           "hpusbscsi",
@@ -86,3 +93,4 @@ static Scsi_Host_Template hpusbscsi_scsi_host_template = {
 #define HP_STATE_PREMATURE              5 /* status prematurely reported */
 
 
+