patch-2.1.10 linux/drivers/scsi/sr_vendor.c

• Lines: 274
• Date: Wed Nov 13 08:11:17 1996
• Orig file: v2.1.9/linux/drivers/scsi/sr_vendor.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v2.1.9/linux/drivers/scsi/sr_vendor.c linux/drivers/scsi/sr_vendor.c
@@ -0,0 +1,273 @@
+/* -*-linux-c-*-
+ *
+ * vendor-specific code for SCSI CD-ROM's goes here.
+ *
+ * This is needed becauce most of the new features (multisession and
+ * the like) are to new to be included into the SCSI-II standard (to
+ * be exact: there is'nt anything in my draft copy).
+ *
+ *   Gerd Knorr <kraxel@cs.tu-berlin.de> 
+ */
+
+#include <linux/errno.h>
+#include <linux/string.h>
+
+#include <linux/blk.h>
+#include "scsi.h"
+#include "hosts.h"
+#include <scsi/scsi_ioctl.h>
+
+#include <linux/cdrom.h>
+#include <linux/ucdrom.h>
+#include "sr.h"
+
+/* here are some constants to sort the vendors into groups */
+
+#define VENDOR_CAN_NOT_HANDLE  1   /* don't know how to handle */
+#define VENDOR_NEC             2
+#define VENDOR_TOSHIBA         3
+#define VENDOR_SONY_LIKE       4   /* much drives are Sony compatible */
+#define VENDOR_HP              5
+
+#define DEBUG
+
+void
+sr_vendor_init(int minor)
+{
+	char *vendor = scsi_CDs[minor].device->vendor;
+	char *model  = scsi_CDs[minor].device->model;
+		
+	if (!strncmp (vendor, "NEC", 3)) {
+		scsi_CDs[minor].vendor = VENDOR_NEC;
+		if (!strncmp (model,"CD-ROM DRIVE:25", 15) ||
+		    !strncmp (model,"CD-ROM DRIVE:36", 15)  ||
+		    !strncmp (model,"CD-ROM DRIVE:83", 15)  ||
+		    !strncmp (model,"CD-ROM DRIVE:84 ",16))
+			/* these can't handle multisession, may hang */
+			scsi_CDs[minor].cdi.mask |= CDC_MULTI_SESSION;
+
+	} else if (!strncmp (vendor, "TOSHIBA", 7)) {
+		scsi_CDs[minor].vendor = VENDOR_TOSHIBA;
+		
+	} else if (!strncmp (vendor, "HP", 2)) {
+		scsi_CDs[minor].vendor = VENDOR_HP;
+		
+	} else {
+		/* most drives can handled like sony ones, so we take
+		 * it as default */
+		scsi_CDs[minor].vendor = VENDOR_SONY_LIKE;
+	}
+}
+
+
+
+/*
+ * support for XA/multisession-CD's
+ * 
+ *   - NEC:     Detection and support of multisession CD's.
+ *     
+ *   - TOSHIBA: Detection and support of multisession CD's.
+ *              Some XA-Sector tweaking, required for older drives.
+ *
+ *   - SONY:	Detection and support of multisession CD's.
+ *              added by Thomas Quinot <operator@melchior.cuivre.fdn.fr>
+ *
+ *   - PIONEER, HITACHI, PLEXTOR, MATSHITA: known to work with SONY code.
+ *
+ *   - HP:	Much like SONY, but a little different... (Thomas)
+ *              HP-Writers only ???
+ */
+
+#define BCD_TO_BIN(x)    ((((int)x & 0xf0) >> 4)*10 + ((int)x & 0x0f))
+
+int sr_cd_check(struct cdrom_device_info *cdi)
+{
+	unsigned long   sector,min,sec,frame;
+	unsigned char   *buffer;    /* the buffer for the ioctl */
+	unsigned char   cmd[12];    /* the scsi-command */
+	int             rc,is_xa,no_multi,minor;
+
+	minor = MINOR(cdi->dev);
+	
+	buffer = (unsigned char *) scsi_malloc(512);
+	if(!buffer) return -ENOMEM;
+	
+	sector   = 0;         /* the multisession sector offset goes here  */
+	is_xa    = 0;         /* flag: the CD uses XA-Sectors              */
+	no_multi = 0;         /* flag: the drive can't handle multisession */
+	rc       = 0;
+    
+	switch(scsi_CDs[minor].vendor) {
+	
+	case VENDOR_NEC:
+		memset(cmd,0,12);
+		cmd[0] = 0xde;
+		cmd[1] = (scsi_CDs[minor].device->lun << 5) | 0x03;
+		cmd[2] = 0xb0;
+		rc = sr_do_ioctl(minor, cmd, buffer, 0x16);
+		if (rc != 0)
+			break;
+		if (buffer[14] != 0 && buffer[14] != 0xb0) {
+			printk(KERN_INFO "sr (nec): Hmm, seems the cdrom doesn't support multisession CD's\n");
+			no_multi = 1;
+			break;
+		}
+		min    = BCD_TO_BIN(buffer[15]);
+		sec    = BCD_TO_BIN(buffer[16]);
+		frame  = BCD_TO_BIN(buffer[17]);
+		sector = min*CD_SECS*CD_FRAMES + sec*CD_FRAMES + frame;
+		is_xa  = (buffer[14] == 0xb0);
+		break;
+		
+	case VENDOR_TOSHIBA:
+		/* we request some disc information (is it a XA-CD ?,
+		 * where starts the last session ?) */
+		memset(cmd,0,12);
+		cmd[0] = 0xc7;
+		cmd[1] = (scsi_CDs[minor].device->lun << 5) | 3;
+		rc = sr_do_ioctl(minor, cmd, buffer, 4);
+		if (rc == 0x28000002 &&
+		    !scsi_ioctl(scsi_CDs[minor].device,
+				SCSI_IOCTL_TEST_UNIT_READY, NULL)) {
+			printk(KERN_INFO "sr (toshiba): Hmm, seems the drive doesn't support multisession CD's\n");
+		    no_multi = 1;
+		    break;
+		}
+		if (rc != 0)
+			break;
+		min    = BCD_TO_BIN(buffer[1]);
+		sec    = BCD_TO_BIN(buffer[2]);
+		frame  = BCD_TO_BIN(buffer[3]);
+		sector = min*CD_SECS*CD_FRAMES + sec*CD_FRAMES + frame;
+		if (sector)
+			sector -= CD_BLOCK_OFFSET;
+		is_xa  = (buffer[0] == 0x20);
+#if 0
+		/* this is required for some CD's:
+		 *   - Enhanced-CD (Hardware tells wrong XA-flag)
+		 *   - these broken non-XA multisession CD's
+		 */
+		if (is_xa == 0 && sector != 0) {
+			printk(KERN_WARNING "Warning: multisession offset "
+			       "found, setting XA-flag\n");
+			is_xa = 1;
+		}
+#endif
+		/* now the XA-Sector tweaking: set_density... */
+		memset(cmd,0,12);
+		cmd[0] = MODE_SELECT;
+		cmd[1] = (scsi_CDs[minor].device->lun << 5)
+			| (1 << 4);
+		cmd[4] = 12;
+		memset(buffer,0,12);
+		buffer[ 3] = 0x08;
+		buffer[ 4] = 0x83;
+		buffer[10] = 0x08;
+		rc = sr_do_ioctl(minor, cmd, buffer, 12);
+		if (rc != 0) {
+			break;
+		}
+#if 0
+		/* shoult'nt be required any more */
+		scsi_CDs[minor].needs_sector_size = 1;
+#endif
+		break;
+
+	case VENDOR_HP:
+		cmd[0] = READ_TOC;
+		cmd[1] = (scsi_CDs[minor].device->lun << 5);
+		cmd[8] = 0x04;
+		cmd[9] = 0x40;
+		rc = sr_do_ioctl(minor, cmd, buffer, 12);	
+		if (rc != 0) {
+			break;
+		}
+		if ((rc = buffer[2]) == 0) {
+			printk (KERN_WARNING
+				"sr (hp): No finished session\n");
+			break;
+		}
+
+		cmd[0] = READ_TOC; /* Read TOC */
+		cmd[1] = (scsi_CDs[minor].device->lun << 5);
+		cmd[6] = rc & 0x7f;  /* number of last session */
+		cmd[8] = 0x0c;
+		cmd[9] = 0x40;
+		rc = sr_do_ioctl(minor, cmd, buffer, 12);	
+		if (rc != 0) {
+			break;
+		}
+
+#undef STRICT_HP
+#ifdef STRICT_HP
+		sector = buffer[11] + (buffer[10] << 8) + (buffer[9] << 16);
+		/* HP documentation states that Logical Start Address is
+		   returned as three (!) bytes, and that buffer[8] is
+		   reserved. This is strange, because a LBA usually is
+		   4 bytes long. */
+#else
+		sector = buffer[11] + (buffer[10] << 8) +
+			(buffer[9] << 16) + (buffer[8] << 24);
+#endif
+		is_xa = !!sector;
+		break;
+
+	case VENDOR_SONY_LIKE:
+		/* Thomas QUINOT <thomas@melchior.cuivre.fdn.fr> */
+#ifdef DEBUG
+		printk(KERN_DEBUG
+		       "sr: use \"Sony group\" multisession code\n");
+#endif
+		memset(cmd,0,12);
+		cmd[0] = READ_TOC;
+		cmd[1] = (scsi_CDs[minor].device->lun << 5);
+		cmd[8] = 12;
+		cmd[9] = 0x40;
+		rc = sr_do_ioctl(minor, cmd, buffer, 12);	
+		if (rc != 0) {
+			break;
+		}
+		if ((buffer[0] << 8) + buffer[1] != 0x0a) {
+			printk(KERN_INFO "sr (sony): Hmm, seems the drive doesn't support multisession CD's\n");
+			no_multi = 1;
+			break;
+		}
+		sector = buffer[11] + (buffer[10] << 8) +
+			(buffer[9] << 16) + (buffer[8] << 24);
+		if (buffer[6] <= 1) {
+			/* ignore sector offsets from first track */
+			sector = 0;
+		}
+		is_xa = !!sector;
+		break;
+		
+	case VENDOR_CAN_NOT_HANDLE:
+		sector = 0;
+		no_multi = 1;
+		break;
+
+	default:
+		/* should not happen */
+		printk(KERN_WARNING
+		       "sr: unknown vendor code (%i), not initialized ?\n",
+		       scsi_CDs[minor].vendor);
+		sector = 0;
+		no_multi = 1;
+		break;
+	}
+    
+#ifdef DEBUG
+	if (sector)
+		printk(KERN_DEBUG
+		       "sr: multisession CD detected, offset: %lu\n",sector);
+#endif
+
+	scsi_CDs[minor].ms_offset = sector;
+	scsi_CDs[minor].xa_flag = is_xa;
+	if (no_multi)
+		cdi->mask |= CDC_MULTI_SESSION;
+	
+	scsi_free(buffer, 512);
+
+	return rc;
+}