linux/drivers/block/paride/pt.c

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/*
pt.c (c) 1998 Grant R. Guenther <grant@torque.net>
Under the terms of the GNU General Public License.
This is the high-level driver for parallel port ATAPI tape
drives based on chips supported by the paride module.
The driver implements both rewinding and non-rewinding
devices, filemarks, and the rewind ioctl. It allocates
a small internal "bounce buffer" for each open device, but
otherwise expects buffering and blocking to be done at the
user level. As with most block-structured tapes, short
writes are padded to full tape blocks, so reading back a file
may return more data than was actually written.
By default, the driver will autoprobe for a single parallel
port ATAPI tape drive, but if their individual parameters are
specified, the driver can handle up to 4 drives.
The rewinding devices are named /dev/pt0, /dev/pt1, ...
while the non-rewinding devices are /dev/npt0, /dev/npt1, etc.
The behaviour of the pt driver can be altered by setting
some parameters from the insmod command line. The following
parameters are adjustable:
drive0 These four arguments can be arrays of
drive1 1-6 integers as follows:
drive2
drive3 <prt>,<pro>,<uni>,<mod>,<slv>,<dly>
Where,
<prt> is the base of the parallel port address for
the corresponding drive. (required)
<pro> is the protocol number for the adapter that
supports this drive. These numbers are
logged by 'paride' when the protocol modules
are initialised. (0 if not given)
<uni> for those adapters that support chained
devices, this is the unit selector for the
chain of devices on the given port. It should
be zero for devices that don't support chaining.
(0 if not given)
<mod> this can be -1 to choose the best mode, or one
of the mode numbers supported by the adapter.
(-1 if not given)
<slv> ATAPI devices can be jumpered to master or slave.
Set this to 0 to choose the master drive, 1 to
choose the slave, -1 (the default) to choose the
first drive found.
<dly> some parallel ports require the driver to
go more slowly. -1 sets a default value that
should work with the chosen protocol. Otherwise,
set this to a small integer, the larger it is
the slower the port i/o. In some cases, setting
this to zero will speed up the device. (default -1)
major You may use this parameter to overide the
default major number (96) that this driver
will use. Be sure to change the device
name as well.
name This parameter is a character string that
contains the name the kernel will use for this
device (in /proc output, for instance).
(default "pt").
verbose This parameter controls the amount of logging
that the driver will do. Set it to 0 for
normal operation, 1 to see autoprobe progress
messages, or 2 to see additional debugging
output. (default 0)
If this driver is built into the kernel, you can use
the following command line parameters, with the same values
as the corresponding module parameters listed above:
pt.drive0
pt.drive1
pt.drive2
pt.drive3
In addition, you can use the parameter pt.disable to disable
the driver entirely.
*/
/* Changes:
1.01 GRG 1998.05.06 Round up transfer size, fix ready_wait,
loosed interpretation of ATAPI standard
for clearing error status.
Eliminate sti();
1.02 GRG 1998.06.16 Eliminate an Ugh.
1.03 GRG 1998.08.15 Adjusted PT_TMO, use HZ in loop timing,
extra debugging
1.04 GRG 1998.09.24 Repair minor coding error, added jumbo support
*/
#define PT_VERSION "1.04"
#define PT_MAJOR 96
#define PT_NAME "pt"
#define PT_UNITS 4
/* Here are things one can override from the insmod command.
Most are autoprobed by paride unless set here. Verbose is on
by default.
*/
static int verbose = 0;
static int major = PT_MAJOR;
static char *name = PT_NAME;
static int disable = 0;
static int drive0[6] = { 0, 0, 0, -1, -1, -1 };
static int drive1[6] = { 0, 0, 0, -1, -1, -1 };
static int drive2[6] = { 0, 0, 0, -1, -1, -1 };
static int drive3[6] = { 0, 0, 0, -1, -1, -1 };
static int (*drives[4])[6] = {&drive0, &drive1, &drive2, &drive3};
#define D_PRT 0
#define D_PRO 1
#define D_UNI 2
#define D_MOD 3
#define D_SLV 4
#define D_DLY 5
#define DU (*drives[unit])
/* end of parameters */
#include <linux/module.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/mtio.h>
#include <linux/device.h>
#include <linux/sched.h> /* current, TASK_*, schedule_timeout() */
#include <linux/mutex.h>
#include <asm/uaccess.h>
module_param(verbose, bool, 0);
module_param(major, int, 0);
module_param(name, charp, 0);
module_param_array(drive0, int, NULL, 0);
module_param_array(drive1, int, NULL, 0);
module_param_array(drive2, int, NULL, 0);
module_param_array(drive3, int, NULL, 0);
#include "paride.h"
#define PT_MAX_RETRIES 5
#define PT_TMO 3000 /* interrupt timeout in jiffies */
#define PT_SPIN_DEL 50 /* spin delay in micro-seconds */
#define PT_RESET_TMO 30 /* 30 seconds */
#define PT_READY_TMO 60 /* 60 seconds */
#define PT_REWIND_TMO 1200 /* 20 minutes */
#define PT_SPIN ((1000000/(HZ*PT_SPIN_DEL))*PT_TMO)
#define STAT_ERR 0x00001
#define STAT_INDEX 0x00002
#define STAT_ECC 0x00004
#define STAT_DRQ 0x00008
#define STAT_SEEK 0x00010
#define STAT_WRERR 0x00020
#define STAT_READY 0x00040
#define STAT_BUSY 0x00080
#define STAT_SENSE 0x1f000
#define ATAPI_TEST_READY 0x00
#define ATAPI_REWIND 0x01
#define ATAPI_REQ_SENSE 0x03
#define ATAPI_READ_6 0x08
#define ATAPI_WRITE_6 0x0a
#define ATAPI_WFM 0x10
#define ATAPI_IDENTIFY 0x12
#define ATAPI_MODE_SENSE 0x1a
#define ATAPI_LOG_SENSE 0x4d
static DEFINE_MUTEX(pt_mutex);
static int pt_open(struct inode *inode, struct file *file);
static long pt_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
static int pt_release(struct inode *inode, struct file *file);
static ssize_t pt_read(struct file *filp, char __user *buf,
size_t count, loff_t * ppos);
static ssize_t pt_write(struct file *filp, const char __user *buf,
size_t count, loff_t * ppos);
static int pt_detect(void);
/* bits in tape->flags */
#define PT_MEDIA 1
#define PT_WRITE_OK 2
#define PT_REWIND 4
#define PT_WRITING 8
#define PT_READING 16
#define PT_EOF 32
#define PT_NAMELEN 8
#define PT_BUFSIZE 16384
struct pt_unit {
struct pi_adapter pia; /* interface to paride layer */
struct pi_adapter *pi;
int flags; /* various state flags */
int last_sense; /* result of last request sense */
int drive; /* drive */
atomic_t available; /* 1 if access is available 0 otherwise */
int bs; /* block size */
int capacity; /* Size of tape in KB */
int present; /* device present ? */
char *bufptr;
char name[PT_NAMELEN]; /* pf0, pf1, ... */
};
static int pt_identify(struct pt_unit *tape);
static struct pt_unit pt[PT_UNITS];
static char pt_scratch[512]; /* scratch block buffer */
/* kernel glue structures */
static const struct file_operations pt_fops = {
.owner = THIS_MODULE,
.read = pt_read,
.write = pt_write,
.unlocked_ioctl = pt_ioctl,
.open = pt_open,
.release = pt_release,
llseek: automatically add .llseek fop All file_operations should get a .llseek operation so we can make nonseekable_open the default for future file operations without a .llseek pointer. The three cases that we can automatically detect are no_llseek, seq_lseek and default_llseek. For cases where we can we can automatically prove that the file offset is always ignored, we use noop_llseek, which maintains the current behavior of not returning an error from a seek. New drivers should normally not use noop_llseek but instead use no_llseek and call nonseekable_open at open time. Existing drivers can be converted to do the same when the maintainer knows for certain that no user code relies on calling seek on the device file. The generated code is often incorrectly indented and right now contains comments that clarify for each added line why a specific variant was chosen. In the version that gets submitted upstream, the comments will be gone and I will manually fix the indentation, because there does not seem to be a way to do that using coccinelle. Some amount of new code is currently sitting in linux-next that should get the same modifications, which I will do at the end of the merge window. Many thanks to Julia Lawall for helping me learn to write a semantic patch that does all this. ===== begin semantic patch ===== // This adds an llseek= method to all file operations, // as a preparation for making no_llseek the default. // // The rules are // - use no_llseek explicitly if we do nonseekable_open // - use seq_lseek for sequential files // - use default_llseek if we know we access f_pos // - use noop_llseek if we know we don't access f_pos, // but we still want to allow users to call lseek // @ open1 exists @ identifier nested_open; @@ nested_open(...) { <+... nonseekable_open(...) ...+> } @ open exists@ identifier open_f; identifier i, f; identifier open1.nested_open; @@ int open_f(struct inode *i, struct file *f) { <+... ( nonseekable_open(...) | nested_open(...) ) ...+> } @ read disable optional_qualifier exists @ identifier read_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; expression E; identifier func; @@ ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off) { <+... ( *off = E | *off += E | func(..., off, ...) | E = *off ) ...+> } @ read_no_fpos disable optional_qualifier exists @ identifier read_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; @@ ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off) { ... when != off } @ write @ identifier write_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; expression E; identifier func; @@ ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off) { <+... ( *off = E | *off += E | func(..., off, ...) | E = *off ) ...+> } @ write_no_fpos @ identifier write_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; @@ ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off) { ... when != off } @ fops0 @ identifier fops; @@ struct file_operations fops = { ... }; @ has_llseek depends on fops0 @ identifier fops0.fops; identifier llseek_f; @@ struct file_operations fops = { ... .llseek = llseek_f, ... }; @ has_read depends on fops0 @ identifier fops0.fops; identifier read_f; @@ struct file_operations fops = { ... .read = read_f, ... }; @ has_write depends on fops0 @ identifier fops0.fops; identifier write_f; @@ struct file_operations fops = { ... .write = write_f, ... }; @ has_open depends on fops0 @ identifier fops0.fops; identifier open_f; @@ struct file_operations fops = { ... .open = open_f, ... }; // use no_llseek if we call nonseekable_open //////////////////////////////////////////// @ nonseekable1 depends on !has_llseek && has_open @ identifier fops0.fops; identifier nso ~= "nonseekable_open"; @@ struct file_operations fops = { ... .open = nso, ... +.llseek = no_llseek, /* nonseekable */ }; @ nonseekable2 depends on !has_llseek @ identifier fops0.fops; identifier open.open_f; @@ struct file_operations fops = { ... .open = open_f, ... +.llseek = no_llseek, /* open uses nonseekable */ }; // use seq_lseek for sequential files ///////////////////////////////////// @ seq depends on !has_llseek @ identifier fops0.fops; identifier sr ~= "seq_read"; @@ struct file_operations fops = { ... .read = sr, ... +.llseek = seq_lseek, /* we have seq_read */ }; // use default_llseek if there is a readdir /////////////////////////////////////////// @ fops1 depends on !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier readdir_e; @@ // any other fop is used that changes pos struct file_operations fops = { ... .readdir = readdir_e, ... +.llseek = default_llseek, /* readdir is present */ }; // use default_llseek if at least one of read/write touches f_pos ///////////////////////////////////////////////////////////////// @ fops2 depends on !fops1 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier read.read_f; @@ // read fops use offset struct file_operations fops = { ... .read = read_f, ... +.llseek = default_llseek, /* read accesses f_pos */ }; @ fops3 depends on !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier write.write_f; @@ // write fops use offset struct file_operations fops = { ... .write = write_f, ... + .llseek = default_llseek, /* write accesses f_pos */ }; // Use noop_llseek if neither read nor write accesses f_pos /////////////////////////////////////////////////////////// @ fops4 depends on !fops1 && !fops2 && !fops3 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier read_no_fpos.read_f; identifier write_no_fpos.write_f; @@ // write fops use offset struct file_operations fops = { ... .write = write_f, .read = read_f, ... +.llseek = noop_llseek, /* read and write both use no f_pos */ }; @ depends on has_write && !has_read && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier write_no_fpos.write_f; @@ struct file_operations fops = { ... .write = write_f, ... +.llseek = noop_llseek, /* write uses no f_pos */ }; @ depends on has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier read_no_fpos.read_f; @@ struct file_operations fops = { ... .read = read_f, ... +.llseek = noop_llseek, /* read uses no f_pos */ }; @ depends on !has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; @@ struct file_operations fops = { ... +.llseek = noop_llseek, /* no read or write fn */ }; ===== End semantic patch ===== Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Julia Lawall <julia@diku.dk> Cc: Christoph Hellwig <hch@infradead.org>
2010-08-15 16:52:59 +00:00
.llseek = noop_llseek,
};
/* sysfs class support */
static struct class *pt_class;
static inline int status_reg(struct pi_adapter *pi)
{
return pi_read_regr(pi, 1, 6);
}
static inline int read_reg(struct pi_adapter *pi, int reg)
{
return pi_read_regr(pi, 0, reg);
}
static inline void write_reg(struct pi_adapter *pi, int reg, int val)
{
pi_write_regr(pi, 0, reg, val);
}
static inline u8 DRIVE(struct pt_unit *tape)
{
return 0xa0+0x10*tape->drive;
}
static int pt_wait(struct pt_unit *tape, int go, int stop, char *fun, char *msg)
{
int j, r, e, s, p;
struct pi_adapter *pi = tape->pi;
j = 0;
while ((((r = status_reg(pi)) & go) || (stop && (!(r & stop))))
&& (j++ < PT_SPIN))
udelay(PT_SPIN_DEL);
if ((r & (STAT_ERR & stop)) || (j > PT_SPIN)) {
s = read_reg(pi, 7);
e = read_reg(pi, 1);
p = read_reg(pi, 2);
if (j > PT_SPIN)
e |= 0x100;
if (fun)
printk("%s: %s %s: alt=0x%x stat=0x%x err=0x%x"
" loop=%d phase=%d\n",
tape->name, fun, msg, r, s, e, j, p);
return (e << 8) + s;
}
return 0;
}
static int pt_command(struct pt_unit *tape, char *cmd, int dlen, char *fun)
{
struct pi_adapter *pi = tape->pi;
pi_connect(pi);
write_reg(pi, 6, DRIVE(tape));
if (pt_wait(tape, STAT_BUSY | STAT_DRQ, 0, fun, "before command")) {
pi_disconnect(pi);
return -1;
}
write_reg(pi, 4, dlen % 256);
write_reg(pi, 5, dlen / 256);
write_reg(pi, 7, 0xa0); /* ATAPI packet command */
if (pt_wait(tape, STAT_BUSY, STAT_DRQ, fun, "command DRQ")) {
pi_disconnect(pi);
return -1;
}
if (read_reg(pi, 2) != 1) {
printk("%s: %s: command phase error\n", tape->name, fun);
pi_disconnect(pi);
return -1;
}
pi_write_block(pi, cmd, 12);
return 0;
}
static int pt_completion(struct pt_unit *tape, char *buf, char *fun)
{
struct pi_adapter *pi = tape->pi;
int r, s, n, p;
r = pt_wait(tape, STAT_BUSY, STAT_DRQ | STAT_READY | STAT_ERR,
fun, "completion");
if (read_reg(pi, 7) & STAT_DRQ) {
n = (((read_reg(pi, 4) + 256 * read_reg(pi, 5)) +
3) & 0xfffc);
p = read_reg(pi, 2) & 3;
if (p == 0)
pi_write_block(pi, buf, n);
if (p == 2)
pi_read_block(pi, buf, n);
}
s = pt_wait(tape, STAT_BUSY, STAT_READY | STAT_ERR, fun, "data done");
pi_disconnect(pi);
return (r ? r : s);
}
static void pt_req_sense(struct pt_unit *tape, int quiet)
{
char rs_cmd[12] = { ATAPI_REQ_SENSE, 0, 0, 0, 16, 0, 0, 0, 0, 0, 0, 0 };
char buf[16];
int r;
r = pt_command(tape, rs_cmd, 16, "Request sense");
mdelay(1);
if (!r)
pt_completion(tape, buf, "Request sense");
tape->last_sense = -1;
if (!r) {
if (!quiet)
printk("%s: Sense key: %x, ASC: %x, ASQ: %x\n",
tape->name, buf[2] & 0xf, buf[12], buf[13]);
tape->last_sense = (buf[2] & 0xf) | ((buf[12] & 0xff) << 8)
| ((buf[13] & 0xff) << 16);
}
}
static int pt_atapi(struct pt_unit *tape, char *cmd, int dlen, char *buf, char *fun)
{
int r;
r = pt_command(tape, cmd, dlen, fun);
mdelay(1);
if (!r)
r = pt_completion(tape, buf, fun);
if (r)
pt_req_sense(tape, !fun);
return r;
}
static void pt_sleep(int cs)
{
schedule_timeout_interruptible(cs);
}
static int pt_poll_dsc(struct pt_unit *tape, int pause, int tmo, char *msg)
{
struct pi_adapter *pi = tape->pi;
int k, e, s;
k = 0;
e = 0;
s = 0;
while (k < tmo) {
pt_sleep(pause);
k++;
pi_connect(pi);
write_reg(pi, 6, DRIVE(tape));
s = read_reg(pi, 7);
e = read_reg(pi, 1);
pi_disconnect(pi);
if (s & (STAT_ERR | STAT_SEEK))
break;
}
if ((k >= tmo) || (s & STAT_ERR)) {
if (k >= tmo)
printk("%s: %s DSC timeout\n", tape->name, msg);
else
printk("%s: %s stat=0x%x err=0x%x\n", tape->name, msg, s,
e);
pt_req_sense(tape, 0);
return 0;
}
return 1;
}
static void pt_media_access_cmd(struct pt_unit *tape, int tmo, char *cmd, char *fun)
{
if (pt_command(tape, cmd, 0, fun)) {
pt_req_sense(tape, 0);
return;
}
pi_disconnect(tape->pi);
pt_poll_dsc(tape, HZ, tmo, fun);
}
static void pt_rewind(struct pt_unit *tape)
{
char rw_cmd[12] = { ATAPI_REWIND, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
pt_media_access_cmd(tape, PT_REWIND_TMO, rw_cmd, "rewind");
}
static void pt_write_fm(struct pt_unit *tape)
{
char wm_cmd[12] = { ATAPI_WFM, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0 };
pt_media_access_cmd(tape, PT_TMO, wm_cmd, "write filemark");
}
#define DBMSG(msg) ((verbose>1)?(msg):NULL)
static int pt_reset(struct pt_unit *tape)
{
struct pi_adapter *pi = tape->pi;
int i, k, flg;
int expect[5] = { 1, 1, 1, 0x14, 0xeb };
pi_connect(pi);
write_reg(pi, 6, DRIVE(tape));
write_reg(pi, 7, 8);
pt_sleep(20 * HZ / 1000);
k = 0;
while ((k++ < PT_RESET_TMO) && (status_reg(pi) & STAT_BUSY))
pt_sleep(HZ / 10);
flg = 1;
for (i = 0; i < 5; i++)
flg &= (read_reg(pi, i + 1) == expect[i]);
if (verbose) {
printk("%s: Reset (%d) signature = ", tape->name, k);
for (i = 0; i < 5; i++)
printk("%3x", read_reg(pi, i + 1));
if (!flg)
printk(" (incorrect)");
printk("\n");
}
pi_disconnect(pi);
return flg - 1;
}
static int pt_ready_wait(struct pt_unit *tape, int tmo)
{
char tr_cmd[12] = { ATAPI_TEST_READY, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
int k, p;
k = 0;
while (k < tmo) {
tape->last_sense = 0;
pt_atapi(tape, tr_cmd, 0, NULL, DBMSG("test unit ready"));
p = tape->last_sense;
if (!p)
return 0;
if (!(((p & 0xffff) == 0x0402) || ((p & 0xff) == 6)))
return p;
k++;
pt_sleep(HZ);
}
return 0x000020; /* timeout */
}
static void xs(char *buf, char *targ, int offs, int len)
{
int j, k, l;
j = 0;
l = 0;
for (k = 0; k < len; k++)
if ((buf[k + offs] != 0x20) || (buf[k + offs] != l))
l = targ[j++] = buf[k + offs];
if (l == 0x20)
j--;
targ[j] = 0;
}
static int xn(char *buf, int offs, int size)
{
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;
mutex_lock(&pt_mutex);
if (unit >= PT_UNITS || (!tape->present)) {
mutex_unlock(&pt_mutex);
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 & FMODE_WRITE))
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;
mutex_unlock(&pt_mutex);
return 0;
out:
atomic_inc(&tape->available);
mutex_unlock(&pt_mutex);
return err;
}
static long pt_ioctl(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:
mutex_lock(&pt_mutex);
pt_rewind(tape);
mutex_unlock(&pt_mutex);
return 0;
case MTWEOF:
mutex_lock(&pt_mutex);
pt_write_fm(tape);
mutex_unlock(&pt_mutex);
return 0;
default:
/* FIXME: rate limit ?? */
printk(KERN_DEBUG "%s: Unimplemented mt_op %d\n", tape->name,
mtop.mt_op);
return -EINVAL;
}
default:
return -ENOTTY;
}
}
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) {
device_create(pt_class, NULL, MKDEV(major, unit), NULL,
"pt%d", unit);
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) {
device_destroy(pt_class, MKDEV(major, unit));
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)