1006 lines
23 KiB
C
1006 lines
23 KiB
C
/*
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pt.c (c) 1998 Grant R. Guenther <grant@torque.net>
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Under the terms of the GNU General Public License.
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This is the high-level driver for parallel port ATAPI tape
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drives based on chips supported by the paride module.
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The driver implements both rewinding and non-rewinding
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devices, filemarks, and the rewind ioctl. It allocates
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a small internal "bounce buffer" for each open device, but
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otherwise expects buffering and blocking to be done at the
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user level. As with most block-structured tapes, short
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writes are padded to full tape blocks, so reading back a file
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may return more data than was actually written.
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By default, the driver will autoprobe for a single parallel
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port ATAPI tape drive, but if their individual parameters are
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specified, the driver can handle up to 4 drives.
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The rewinding devices are named /dev/pt0, /dev/pt1, ...
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while the non-rewinding devices are /dev/npt0, /dev/npt1, etc.
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The behaviour of the pt driver can be altered by setting
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some parameters from the insmod command line. The following
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parameters are adjustable:
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drive0 These four arguments can be arrays of
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drive1 1-6 integers as follows:
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drive2
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drive3 <prt>,<pro>,<uni>,<mod>,<slv>,<dly>
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Where,
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<prt> is the base of the parallel port address for
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the corresponding drive. (required)
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<pro> is the protocol number for the adapter that
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supports this drive. These numbers are
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logged by 'paride' when the protocol modules
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are initialised. (0 if not given)
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<uni> for those adapters that support chained
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devices, this is the unit selector for the
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chain of devices on the given port. It should
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be zero for devices that don't support chaining.
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(0 if not given)
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<mod> this can be -1 to choose the best mode, or one
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of the mode numbers supported by the adapter.
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(-1 if not given)
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<slv> ATAPI devices can be jumpered to master or slave.
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Set this to 0 to choose the master drive, 1 to
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choose the slave, -1 (the default) to choose the
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first drive found.
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<dly> some parallel ports require the driver to
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go more slowly. -1 sets a default value that
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should work with the chosen protocol. Otherwise,
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set this to a small integer, the larger it is
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the slower the port i/o. In some cases, setting
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this to zero will speed up the device. (default -1)
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major You may use this parameter to overide the
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default major number (96) that this driver
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will use. Be sure to change the device
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name as well.
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name This parameter is a character string that
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contains the name the kernel will use for this
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device (in /proc output, for instance).
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(default "pt").
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verbose This parameter controls the amount of logging
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that the driver will do. Set it to 0 for
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normal operation, 1 to see autoprobe progress
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messages, or 2 to see additional debugging
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output. (default 0)
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If this driver is built into the kernel, you can use
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the following command line parameters, with the same values
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as the corresponding module parameters listed above:
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pt.drive0
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pt.drive1
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pt.drive2
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pt.drive3
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In addition, you can use the parameter pt.disable to disable
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the driver entirely.
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*/
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/* Changes:
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1.01 GRG 1998.05.06 Round up transfer size, fix ready_wait,
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loosed interpretation of ATAPI standard
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for clearing error status.
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Eliminate sti();
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1.02 GRG 1998.06.16 Eliminate an Ugh.
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1.03 GRG 1998.08.15 Adjusted PT_TMO, use HZ in loop timing,
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extra debugging
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1.04 GRG 1998.09.24 Repair minor coding error, added jumbo support
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*/
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#define PT_VERSION "1.04"
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#define PT_MAJOR 96
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#define PT_NAME "pt"
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#define PT_UNITS 4
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/* Here are things one can override from the insmod command.
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Most are autoprobed by paride unless set here. Verbose is on
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by default.
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*/
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static int verbose = 0;
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static int major = PT_MAJOR;
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static char *name = PT_NAME;
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static int disable = 0;
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static int drive0[6] = { 0, 0, 0, -1, -1, -1 };
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static int drive1[6] = { 0, 0, 0, -1, -1, -1 };
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static int drive2[6] = { 0, 0, 0, -1, -1, -1 };
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static int drive3[6] = { 0, 0, 0, -1, -1, -1 };
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static int (*drives[4])[6] = {&drive0, &drive1, &drive2, &drive3};
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#define D_PRT 0
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#define D_PRO 1
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#define D_UNI 2
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#define D_MOD 3
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#define D_SLV 4
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#define D_DLY 5
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#define DU (*drives[unit])
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/* end of parameters */
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/fs.h>
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#include <linux/delay.h>
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#include <linux/slab.h>
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#include <linux/mtio.h>
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#include <linux/device.h>
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#include <linux/sched.h> /* current, TASK_*, schedule_timeout() */
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#include <asm/uaccess.h>
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module_param(verbose, bool, 0);
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module_param(major, int, 0);
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module_param(name, charp, 0);
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module_param_array(drive0, int, NULL, 0);
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module_param_array(drive1, int, NULL, 0);
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module_param_array(drive2, int, NULL, 0);
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module_param_array(drive3, int, NULL, 0);
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#include "paride.h"
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#define PT_MAX_RETRIES 5
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#define PT_TMO 3000 /* interrupt timeout in jiffies */
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#define PT_SPIN_DEL 50 /* spin delay in micro-seconds */
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#define PT_RESET_TMO 30 /* 30 seconds */
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#define PT_READY_TMO 60 /* 60 seconds */
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#define PT_REWIND_TMO 1200 /* 20 minutes */
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#define PT_SPIN ((1000000/(HZ*PT_SPIN_DEL))*PT_TMO)
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#define STAT_ERR 0x00001
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#define STAT_INDEX 0x00002
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#define STAT_ECC 0x00004
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#define STAT_DRQ 0x00008
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#define STAT_SEEK 0x00010
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#define STAT_WRERR 0x00020
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#define STAT_READY 0x00040
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#define STAT_BUSY 0x00080
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#define STAT_SENSE 0x1f000
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#define ATAPI_TEST_READY 0x00
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#define ATAPI_REWIND 0x01
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#define ATAPI_REQ_SENSE 0x03
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#define ATAPI_READ_6 0x08
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#define ATAPI_WRITE_6 0x0a
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#define ATAPI_WFM 0x10
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#define ATAPI_IDENTIFY 0x12
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#define ATAPI_MODE_SENSE 0x1a
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#define ATAPI_LOG_SENSE 0x4d
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static int pt_open(struct inode *inode, struct file *file);
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static int pt_ioctl(struct inode *inode, struct file *file,
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unsigned int cmd, unsigned long arg);
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static int pt_release(struct inode *inode, struct file *file);
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static ssize_t pt_read(struct file *filp, char __user *buf,
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size_t count, loff_t * ppos);
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static ssize_t pt_write(struct file *filp, const char __user *buf,
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size_t count, loff_t * ppos);
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static int pt_detect(void);
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/* bits in tape->flags */
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#define PT_MEDIA 1
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#define PT_WRITE_OK 2
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#define PT_REWIND 4
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#define PT_WRITING 8
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#define PT_READING 16
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#define PT_EOF 32
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#define PT_NAMELEN 8
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#define PT_BUFSIZE 16384
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struct pt_unit {
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struct pi_adapter pia; /* interface to paride layer */
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struct pi_adapter *pi;
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int flags; /* various state flags */
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int last_sense; /* result of last request sense */
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int drive; /* drive */
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atomic_t available; /* 1 if access is available 0 otherwise */
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int bs; /* block size */
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int capacity; /* Size of tape in KB */
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int present; /* device present ? */
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char *bufptr;
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char name[PT_NAMELEN]; /* pf0, pf1, ... */
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};
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static int pt_identify(struct pt_unit *tape);
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static struct pt_unit pt[PT_UNITS];
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static char pt_scratch[512]; /* scratch block buffer */
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/* kernel glue structures */
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static const struct file_operations pt_fops = {
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.owner = THIS_MODULE,
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.read = pt_read,
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.write = pt_write,
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.ioctl = pt_ioctl,
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.open = pt_open,
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.release = pt_release,
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};
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/* sysfs class support */
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static struct class *pt_class;
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static inline int status_reg(struct pi_adapter *pi)
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{
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return pi_read_regr(pi, 1, 6);
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}
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static inline int read_reg(struct pi_adapter *pi, int reg)
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{
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return pi_read_regr(pi, 0, reg);
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}
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static inline void write_reg(struct pi_adapter *pi, int reg, int val)
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{
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pi_write_regr(pi, 0, reg, val);
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}
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static inline u8 DRIVE(struct pt_unit *tape)
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{
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return 0xa0+0x10*tape->drive;
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}
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static int pt_wait(struct pt_unit *tape, int go, int stop, char *fun, char *msg)
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{
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int j, r, e, s, p;
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struct pi_adapter *pi = tape->pi;
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j = 0;
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while ((((r = status_reg(pi)) & go) || (stop && (!(r & stop))))
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&& (j++ < PT_SPIN))
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udelay(PT_SPIN_DEL);
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if ((r & (STAT_ERR & stop)) || (j >= PT_SPIN)) {
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s = read_reg(pi, 7);
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e = read_reg(pi, 1);
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p = read_reg(pi, 2);
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if (j >= PT_SPIN)
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e |= 0x100;
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if (fun)
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printk("%s: %s %s: alt=0x%x stat=0x%x err=0x%x"
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" loop=%d phase=%d\n",
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tape->name, fun, msg, r, s, e, j, p);
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return (e << 8) + s;
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}
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return 0;
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}
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static int pt_command(struct pt_unit *tape, char *cmd, int dlen, char *fun)
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{
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struct pi_adapter *pi = tape->pi;
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pi_connect(pi);
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write_reg(pi, 6, DRIVE(tape));
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if (pt_wait(tape, STAT_BUSY | STAT_DRQ, 0, fun, "before command")) {
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pi_disconnect(pi);
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return -1;
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}
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write_reg(pi, 4, dlen % 256);
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write_reg(pi, 5, dlen / 256);
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write_reg(pi, 7, 0xa0); /* ATAPI packet command */
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if (pt_wait(tape, STAT_BUSY, STAT_DRQ, fun, "command DRQ")) {
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pi_disconnect(pi);
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return -1;
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}
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if (read_reg(pi, 2) != 1) {
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printk("%s: %s: command phase error\n", tape->name, fun);
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pi_disconnect(pi);
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return -1;
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}
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pi_write_block(pi, cmd, 12);
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return 0;
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}
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static int pt_completion(struct pt_unit *tape, char *buf, char *fun)
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{
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struct pi_adapter *pi = tape->pi;
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int r, s, n, p;
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r = pt_wait(tape, STAT_BUSY, STAT_DRQ | STAT_READY | STAT_ERR,
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fun, "completion");
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if (read_reg(pi, 7) & STAT_DRQ) {
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n = (((read_reg(pi, 4) + 256 * read_reg(pi, 5)) +
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3) & 0xfffc);
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p = read_reg(pi, 2) & 3;
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if (p == 0)
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pi_write_block(pi, buf, n);
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if (p == 2)
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pi_read_block(pi, buf, n);
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}
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s = pt_wait(tape, STAT_BUSY, STAT_READY | STAT_ERR, fun, "data done");
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pi_disconnect(pi);
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return (r ? r : s);
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}
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static void pt_req_sense(struct pt_unit *tape, int quiet)
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{
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char rs_cmd[12] = { ATAPI_REQ_SENSE, 0, 0, 0, 16, 0, 0, 0, 0, 0, 0, 0 };
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char buf[16];
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int r;
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r = pt_command(tape, rs_cmd, 16, "Request sense");
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mdelay(1);
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if (!r)
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pt_completion(tape, buf, "Request sense");
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tape->last_sense = -1;
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if (!r) {
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if (!quiet)
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printk("%s: Sense key: %x, ASC: %x, ASQ: %x\n",
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tape->name, buf[2] & 0xf, buf[12], buf[13]);
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tape->last_sense = (buf[2] & 0xf) | ((buf[12] & 0xff) << 8)
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| ((buf[13] & 0xff) << 16);
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}
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}
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static int pt_atapi(struct pt_unit *tape, char *cmd, int dlen, char *buf, char *fun)
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{
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int r;
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r = pt_command(tape, cmd, dlen, fun);
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mdelay(1);
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if (!r)
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r = pt_completion(tape, buf, fun);
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if (r)
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pt_req_sense(tape, !fun);
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return r;
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}
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static void pt_sleep(int cs)
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{
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schedule_timeout_interruptible(cs);
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}
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static int pt_poll_dsc(struct pt_unit *tape, int pause, int tmo, char *msg)
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{
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struct pi_adapter *pi = tape->pi;
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int k, e, s;
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k = 0;
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e = 0;
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s = 0;
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while (k < tmo) {
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pt_sleep(pause);
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k++;
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pi_connect(pi);
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write_reg(pi, 6, DRIVE(tape));
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s = read_reg(pi, 7);
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e = read_reg(pi, 1);
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pi_disconnect(pi);
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if (s & (STAT_ERR | STAT_SEEK))
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break;
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}
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if ((k >= tmo) || (s & STAT_ERR)) {
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if (k >= tmo)
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printk("%s: %s DSC timeout\n", tape->name, msg);
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else
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printk("%s: %s stat=0x%x err=0x%x\n", tape->name, msg, s,
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e);
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pt_req_sense(tape, 0);
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return 0;
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}
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return 1;
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}
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static void pt_media_access_cmd(struct pt_unit *tape, int tmo, char *cmd, char *fun)
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{
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if (pt_command(tape, cmd, 0, fun)) {
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pt_req_sense(tape, 0);
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return;
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}
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pi_disconnect(tape->pi);
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pt_poll_dsc(tape, HZ, tmo, fun);
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}
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static void pt_rewind(struct pt_unit *tape)
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{
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char rw_cmd[12] = { ATAPI_REWIND, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
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pt_media_access_cmd(tape, PT_REWIND_TMO, rw_cmd, "rewind");
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}
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static void pt_write_fm(struct pt_unit *tape)
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{
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char wm_cmd[12] = { ATAPI_WFM, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0 };
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pt_media_access_cmd(tape, PT_TMO, wm_cmd, "write filemark");
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}
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#define DBMSG(msg) ((verbose>1)?(msg):NULL)
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static int pt_reset(struct pt_unit *tape)
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{
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struct pi_adapter *pi = tape->pi;
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int i, k, flg;
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int expect[5] = { 1, 1, 1, 0x14, 0xeb };
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pi_connect(pi);
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write_reg(pi, 6, DRIVE(tape));
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write_reg(pi, 7, 8);
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pt_sleep(20 * HZ / 1000);
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k = 0;
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while ((k++ < PT_RESET_TMO) && (status_reg(pi) & STAT_BUSY))
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pt_sleep(HZ / 10);
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flg = 1;
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for (i = 0; i < 5; i++)
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flg &= (read_reg(pi, i + 1) == expect[i]);
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if (verbose) {
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printk("%s: Reset (%d) signature = ", tape->name, k);
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for (i = 0; i < 5; i++)
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printk("%3x", read_reg(pi, i + 1));
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if (!flg)
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printk(" (incorrect)");
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printk("\n");
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}
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pi_disconnect(pi);
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return flg - 1;
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}
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static int pt_ready_wait(struct pt_unit *tape, int tmo)
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{
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char tr_cmd[12] = { ATAPI_TEST_READY, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
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int k, p;
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k = 0;
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while (k < tmo) {
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tape->last_sense = 0;
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pt_atapi(tape, tr_cmd, 0, NULL, DBMSG("test unit ready"));
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p = tape->last_sense;
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if (!p)
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return 0;
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if (!(((p & 0xffff) == 0x0402) || ((p & 0xff) == 6)))
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return p;
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k++;
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pt_sleep(HZ);
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}
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return 0x000020; /* timeout */
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}
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static void xs(char *buf, char *targ, int offs, int len)
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{
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int j, k, l;
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j = 0;
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l = 0;
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for (k = 0; k < len; k++)
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if ((buf[k + offs] != 0x20) || (buf[k + offs] != l))
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l = targ[j++] = buf[k + offs];
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if (l == 0x20)
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j--;
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targ[j] = 0;
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}
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static int xn(char *buf, int offs, int size)
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{
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int v, k;
|
|
|
|
v = 0;
|
|
for (k = 0; k < size; k++)
|
|
v = v * 256 + (buf[k + offs] & 0xff);
|
|
return v;
|
|
}
|
|
|
|
static int pt_identify(struct pt_unit *tape)
|
|
{
|
|
int dt, s;
|
|
char *ms[2] = { "master", "slave" };
|
|
char mf[10], id[18];
|
|
char id_cmd[12] = { ATAPI_IDENTIFY, 0, 0, 0, 36, 0, 0, 0, 0, 0, 0, 0 };
|
|
char ms_cmd[12] =
|
|
{ ATAPI_MODE_SENSE, 0, 0x2a, 0, 36, 0, 0, 0, 0, 0, 0, 0 };
|
|
char ls_cmd[12] =
|
|
{ ATAPI_LOG_SENSE, 0, 0x71, 0, 0, 0, 0, 0, 36, 0, 0, 0 };
|
|
char buf[36];
|
|
|
|
s = pt_atapi(tape, id_cmd, 36, buf, "identify");
|
|
if (s)
|
|
return -1;
|
|
|
|
dt = buf[0] & 0x1f;
|
|
if (dt != 1) {
|
|
if (verbose)
|
|
printk("%s: Drive %d, unsupported type %d\n",
|
|
tape->name, tape->drive, dt);
|
|
return -1;
|
|
}
|
|
|
|
xs(buf, mf, 8, 8);
|
|
xs(buf, id, 16, 16);
|
|
|
|
tape->flags = 0;
|
|
tape->capacity = 0;
|
|
tape->bs = 0;
|
|
|
|
if (!pt_ready_wait(tape, PT_READY_TMO))
|
|
tape->flags |= PT_MEDIA;
|
|
|
|
if (!pt_atapi(tape, ms_cmd, 36, buf, "mode sense")) {
|
|
if (!(buf[2] & 0x80))
|
|
tape->flags |= PT_WRITE_OK;
|
|
tape->bs = xn(buf, 10, 2);
|
|
}
|
|
|
|
if (!pt_atapi(tape, ls_cmd, 36, buf, "log sense"))
|
|
tape->capacity = xn(buf, 24, 4);
|
|
|
|
printk("%s: %s %s, %s", tape->name, mf, id, ms[tape->drive]);
|
|
if (!(tape->flags & PT_MEDIA))
|
|
printk(", no media\n");
|
|
else {
|
|
if (!(tape->flags & PT_WRITE_OK))
|
|
printk(", RO");
|
|
printk(", blocksize %d, %d MB\n", tape->bs, tape->capacity / 1024);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* returns 0, with id set if drive is detected
|
|
* -1, if drive detection failed
|
|
*/
|
|
static int pt_probe(struct pt_unit *tape)
|
|
{
|
|
if (tape->drive == -1) {
|
|
for (tape->drive = 0; tape->drive <= 1; tape->drive++)
|
|
if (!pt_reset(tape))
|
|
return pt_identify(tape);
|
|
} else {
|
|
if (!pt_reset(tape))
|
|
return pt_identify(tape);
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
static int pt_detect(void)
|
|
{
|
|
struct pt_unit *tape;
|
|
int specified = 0, found = 0;
|
|
int unit;
|
|
|
|
printk("%s: %s version %s, major %d\n", name, name, PT_VERSION, major);
|
|
|
|
specified = 0;
|
|
for (unit = 0; unit < PT_UNITS; unit++) {
|
|
struct pt_unit *tape = &pt[unit];
|
|
tape->pi = &tape->pia;
|
|
atomic_set(&tape->available, 1);
|
|
tape->flags = 0;
|
|
tape->last_sense = 0;
|
|
tape->present = 0;
|
|
tape->bufptr = NULL;
|
|
tape->drive = DU[D_SLV];
|
|
snprintf(tape->name, PT_NAMELEN, "%s%d", name, unit);
|
|
if (!DU[D_PRT])
|
|
continue;
|
|
specified++;
|
|
if (pi_init(tape->pi, 0, DU[D_PRT], DU[D_MOD], DU[D_UNI],
|
|
DU[D_PRO], DU[D_DLY], pt_scratch, PI_PT,
|
|
verbose, tape->name)) {
|
|
if (!pt_probe(tape)) {
|
|
tape->present = 1;
|
|
found++;
|
|
} else
|
|
pi_release(tape->pi);
|
|
}
|
|
}
|
|
if (specified == 0) {
|
|
tape = pt;
|
|
if (pi_init(tape->pi, 1, -1, -1, -1, -1, -1, pt_scratch,
|
|
PI_PT, verbose, tape->name)) {
|
|
if (!pt_probe(tape)) {
|
|
tape->present = 1;
|
|
found++;
|
|
} else
|
|
pi_release(tape->pi);
|
|
}
|
|
|
|
}
|
|
if (found)
|
|
return 0;
|
|
|
|
printk("%s: No ATAPI tape drive detected\n", name);
|
|
return -1;
|
|
}
|
|
|
|
static int pt_open(struct inode *inode, struct file *file)
|
|
{
|
|
int unit = iminor(inode) & 0x7F;
|
|
struct pt_unit *tape = pt + unit;
|
|
int err;
|
|
|
|
if (unit >= PT_UNITS || (!tape->present))
|
|
return -ENODEV;
|
|
|
|
err = -EBUSY;
|
|
if (!atomic_dec_and_test(&tape->available))
|
|
goto out;
|
|
|
|
pt_identify(tape);
|
|
|
|
err = -ENODEV;
|
|
if (!tape->flags & PT_MEDIA)
|
|
goto out;
|
|
|
|
err = -EROFS;
|
|
if ((!tape->flags & PT_WRITE_OK) && (file->f_mode & 2))
|
|
goto out;
|
|
|
|
if (!(iminor(inode) & 128))
|
|
tape->flags |= PT_REWIND;
|
|
|
|
err = -ENOMEM;
|
|
tape->bufptr = kmalloc(PT_BUFSIZE, GFP_KERNEL);
|
|
if (tape->bufptr == NULL) {
|
|
printk("%s: buffer allocation failed\n", tape->name);
|
|
goto out;
|
|
}
|
|
|
|
file->private_data = tape;
|
|
return 0;
|
|
|
|
out:
|
|
atomic_inc(&tape->available);
|
|
return err;
|
|
}
|
|
|
|
static int pt_ioctl(struct inode *inode, struct file *file,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct pt_unit *tape = file->private_data;
|
|
struct mtop __user *p = (void __user *)arg;
|
|
struct mtop mtop;
|
|
|
|
switch (cmd) {
|
|
case MTIOCTOP:
|
|
if (copy_from_user(&mtop, p, sizeof(struct mtop)))
|
|
return -EFAULT;
|
|
|
|
switch (mtop.mt_op) {
|
|
|
|
case MTREW:
|
|
pt_rewind(tape);
|
|
return 0;
|
|
|
|
case MTWEOF:
|
|
pt_write_fm(tape);
|
|
return 0;
|
|
|
|
default:
|
|
printk("%s: Unimplemented mt_op %d\n", tape->name,
|
|
mtop.mt_op);
|
|
return -EINVAL;
|
|
}
|
|
|
|
default:
|
|
printk("%s: Unimplemented ioctl 0x%x\n", tape->name, cmd);
|
|
return -EINVAL;
|
|
|
|
}
|
|
}
|
|
|
|
static int
|
|
pt_release(struct inode *inode, struct file *file)
|
|
{
|
|
struct pt_unit *tape = file->private_data;
|
|
|
|
if (atomic_read(&tape->available) > 1)
|
|
return -EINVAL;
|
|
|
|
if (tape->flags & PT_WRITING)
|
|
pt_write_fm(tape);
|
|
|
|
if (tape->flags & PT_REWIND)
|
|
pt_rewind(tape);
|
|
|
|
kfree(tape->bufptr);
|
|
tape->bufptr = NULL;
|
|
|
|
atomic_inc(&tape->available);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
static ssize_t pt_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
|
|
{
|
|
struct pt_unit *tape = filp->private_data;
|
|
struct pi_adapter *pi = tape->pi;
|
|
char rd_cmd[12] = { ATAPI_READ_6, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
|
|
int k, n, r, p, s, t, b;
|
|
|
|
if (!(tape->flags & (PT_READING | PT_WRITING))) {
|
|
tape->flags |= PT_READING;
|
|
if (pt_atapi(tape, rd_cmd, 0, NULL, "start read-ahead"))
|
|
return -EIO;
|
|
} else if (tape->flags & PT_WRITING)
|
|
return -EIO;
|
|
|
|
if (tape->flags & PT_EOF)
|
|
return 0;
|
|
|
|
t = 0;
|
|
|
|
while (count > 0) {
|
|
|
|
if (!pt_poll_dsc(tape, HZ / 100, PT_TMO, "read"))
|
|
return -EIO;
|
|
|
|
n = count;
|
|
if (n > 32768)
|
|
n = 32768; /* max per command */
|
|
b = (n - 1 + tape->bs) / tape->bs;
|
|
n = b * tape->bs; /* rounded up to even block */
|
|
|
|
rd_cmd[4] = b;
|
|
|
|
r = pt_command(tape, rd_cmd, n, "read");
|
|
|
|
mdelay(1);
|
|
|
|
if (r) {
|
|
pt_req_sense(tape, 0);
|
|
return -EIO;
|
|
}
|
|
|
|
while (1) {
|
|
|
|
r = pt_wait(tape, STAT_BUSY,
|
|
STAT_DRQ | STAT_ERR | STAT_READY,
|
|
DBMSG("read DRQ"), "");
|
|
|
|
if (r & STAT_SENSE) {
|
|
pi_disconnect(pi);
|
|
pt_req_sense(tape, 0);
|
|
return -EIO;
|
|
}
|
|
|
|
if (r)
|
|
tape->flags |= PT_EOF;
|
|
|
|
s = read_reg(pi, 7);
|
|
|
|
if (!(s & STAT_DRQ))
|
|
break;
|
|
|
|
n = (read_reg(pi, 4) + 256 * read_reg(pi, 5));
|
|
p = (read_reg(pi, 2) & 3);
|
|
if (p != 2) {
|
|
pi_disconnect(pi);
|
|
printk("%s: Phase error on read: %d\n", tape->name,
|
|
p);
|
|
return -EIO;
|
|
}
|
|
|
|
while (n > 0) {
|
|
k = n;
|
|
if (k > PT_BUFSIZE)
|
|
k = PT_BUFSIZE;
|
|
pi_read_block(pi, tape->bufptr, k);
|
|
n -= k;
|
|
b = k;
|
|
if (b > count)
|
|
b = count;
|
|
if (copy_to_user(buf + t, tape->bufptr, b)) {
|
|
pi_disconnect(pi);
|
|
return -EFAULT;
|
|
}
|
|
t += b;
|
|
count -= b;
|
|
}
|
|
|
|
}
|
|
pi_disconnect(pi);
|
|
if (tape->flags & PT_EOF)
|
|
break;
|
|
}
|
|
|
|
return t;
|
|
|
|
}
|
|
|
|
static ssize_t pt_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
|
|
{
|
|
struct pt_unit *tape = filp->private_data;
|
|
struct pi_adapter *pi = tape->pi;
|
|
char wr_cmd[12] = { ATAPI_WRITE_6, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
|
|
int k, n, r, p, s, t, b;
|
|
|
|
if (!(tape->flags & PT_WRITE_OK))
|
|
return -EROFS;
|
|
|
|
if (!(tape->flags & (PT_READING | PT_WRITING))) {
|
|
tape->flags |= PT_WRITING;
|
|
if (pt_atapi
|
|
(tape, wr_cmd, 0, NULL, "start buffer-available mode"))
|
|
return -EIO;
|
|
} else if (tape->flags & PT_READING)
|
|
return -EIO;
|
|
|
|
if (tape->flags & PT_EOF)
|
|
return -ENOSPC;
|
|
|
|
t = 0;
|
|
|
|
while (count > 0) {
|
|
|
|
if (!pt_poll_dsc(tape, HZ / 100, PT_TMO, "write"))
|
|
return -EIO;
|
|
|
|
n = count;
|
|
if (n > 32768)
|
|
n = 32768; /* max per command */
|
|
b = (n - 1 + tape->bs) / tape->bs;
|
|
n = b * tape->bs; /* rounded up to even block */
|
|
|
|
wr_cmd[4] = b;
|
|
|
|
r = pt_command(tape, wr_cmd, n, "write");
|
|
|
|
mdelay(1);
|
|
|
|
if (r) { /* error delivering command only */
|
|
pt_req_sense(tape, 0);
|
|
return -EIO;
|
|
}
|
|
|
|
while (1) {
|
|
|
|
r = pt_wait(tape, STAT_BUSY,
|
|
STAT_DRQ | STAT_ERR | STAT_READY,
|
|
DBMSG("write DRQ"), NULL);
|
|
|
|
if (r & STAT_SENSE) {
|
|
pi_disconnect(pi);
|
|
pt_req_sense(tape, 0);
|
|
return -EIO;
|
|
}
|
|
|
|
if (r)
|
|
tape->flags |= PT_EOF;
|
|
|
|
s = read_reg(pi, 7);
|
|
|
|
if (!(s & STAT_DRQ))
|
|
break;
|
|
|
|
n = (read_reg(pi, 4) + 256 * read_reg(pi, 5));
|
|
p = (read_reg(pi, 2) & 3);
|
|
if (p != 0) {
|
|
pi_disconnect(pi);
|
|
printk("%s: Phase error on write: %d \n",
|
|
tape->name, p);
|
|
return -EIO;
|
|
}
|
|
|
|
while (n > 0) {
|
|
k = n;
|
|
if (k > PT_BUFSIZE)
|
|
k = PT_BUFSIZE;
|
|
b = k;
|
|
if (b > count)
|
|
b = count;
|
|
if (copy_from_user(tape->bufptr, buf + t, b)) {
|
|
pi_disconnect(pi);
|
|
return -EFAULT;
|
|
}
|
|
pi_write_block(pi, tape->bufptr, k);
|
|
t += b;
|
|
count -= b;
|
|
n -= k;
|
|
}
|
|
|
|
}
|
|
pi_disconnect(pi);
|
|
if (tape->flags & PT_EOF)
|
|
break;
|
|
}
|
|
|
|
return t;
|
|
}
|
|
|
|
static int __init pt_init(void)
|
|
{
|
|
int unit;
|
|
int err;
|
|
|
|
if (disable) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (pt_detect()) {
|
|
err = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
err = register_chrdev(major, name, &pt_fops);
|
|
if (err < 0) {
|
|
printk("pt_init: unable to get major number %d\n", major);
|
|
for (unit = 0; unit < PT_UNITS; unit++)
|
|
if (pt[unit].present)
|
|
pi_release(pt[unit].pi);
|
|
goto out;
|
|
}
|
|
major = err;
|
|
pt_class = class_create(THIS_MODULE, "pt");
|
|
if (IS_ERR(pt_class)) {
|
|
err = PTR_ERR(pt_class);
|
|
goto out_chrdev;
|
|
}
|
|
|
|
for (unit = 0; unit < PT_UNITS; unit++)
|
|
if (pt[unit].present) {
|
|
class_device_create(pt_class, NULL, MKDEV(major, unit),
|
|
NULL, "pt%d", unit);
|
|
class_device_create(pt_class, NULL, MKDEV(major, unit + 128),
|
|
NULL, "pt%dn", unit);
|
|
}
|
|
goto out;
|
|
|
|
out_chrdev:
|
|
unregister_chrdev(major, "pt");
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static void __exit pt_exit(void)
|
|
{
|
|
int unit;
|
|
for (unit = 0; unit < PT_UNITS; unit++)
|
|
if (pt[unit].present) {
|
|
class_device_destroy(pt_class, MKDEV(major, unit));
|
|
class_device_destroy(pt_class, MKDEV(major, unit + 128));
|
|
}
|
|
class_destroy(pt_class);
|
|
unregister_chrdev(major, name);
|
|
for (unit = 0; unit < PT_UNITS; unit++)
|
|
if (pt[unit].present)
|
|
pi_release(pt[unit].pi);
|
|
}
|
|
|
|
MODULE_LICENSE("GPL");
|
|
module_init(pt_init)
|
|
module_exit(pt_exit)
|