patch-2.1.118 linux/drivers/block/paride/pg.c
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- Lines: 623
- Date:
Mon Aug 24 13:46:50 1998
- Orig file:
v2.1.117/linux/drivers/block/paride/pg.c
- Orig date:
Wed Jun 24 22:54:04 1998
diff -u --recursive --new-file v2.1.117/linux/drivers/block/paride/pg.c linux/drivers/block/paride/pg.c
@@ -1,35 +1,35 @@
/*
- pg.c (c) 1998 Grant R. Guenther <grant@torque.net>
- Under the terms of the GNU public license.
+ pg.c (c) 1998 Grant R. Guenther <grant@torque.net>
+ Under the terms of the GNU public license.
The pg driver provides a simple character device interface for
- sending ATAPI commands to a device. With the exception of the
+ sending ATAPI commands to a device. With the exception of the
ATAPI reset operation, all operations are performed by a pair
- of read and write operations to the appropriate /dev/pgN device.
+ of read and write operations to the appropriate /dev/pgN device.
A write operation delivers a command and any outbound data in
- a single buffer. Normally, the write will succeed unless the
- device is offline or malfunctioning, or there is already another
+ a single buffer. Normally, the write will succeed unless the
+ device is offline or malfunctioning, or there is already another
command pending. If the write succeeds, it should be followed
- immediately by a read operation, to obtain any returned data and
- status information. A read will fail if there is no operation
- in progress.
+ immediately by a read operation, to obtain any returned data and
+ status information. A read will fail if there is no operation
+ in progress.
As a special case, the device can be reset with a write operation,
- and in this case, no following read is expected, or permitted.
+ and in this case, no following read is expected, or permitted.
There are no ioctl() operations. Any single operation
may transfer at most PG_MAX_DATA bytes. Note that the driver must
- copy the data through an internal buffer. In keeping with all
+ copy the data through an internal buffer. In keeping with all
current ATAPI devices, command packets are assumed to be exactly
12 bytes in length.
To permit future changes to this interface, the headers in the
read and write buffers contain a single character "magic" flag.
- Currently this flag must be the character "P".
+ Currently this flag must be the character "P".
- By default, the driver will autoprobe for a single parallel
- port ATAPI device, but if their individual parameters are
- specified, the driver can handle up to 4 devices.
+ By default, the driver will autoprobe for a single parallel
+ port ATAPI device, but if their individual parameters are
+ specified, the driver can handle up to 4 devices.
To use this device, you must have the following device
special files defined:
@@ -41,48 +41,48 @@
(You'll need to change the 97 to something else if you use
the 'major' parameter to install the driver on a different
- major number.)
+ major number.)
- The behaviour of the pg 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)
+ The behaviour of the pg 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 (97) that this driver
@@ -94,23 +94,23 @@
device (in /proc output, for instance).
(default "pg").
- verbose This parameter controls the amount of logging
- that is done by the driver. Set it to 0 for
+ verbose This parameter controls the amount of logging
+ that is done by the driver. Set it to 0 for
quiet operation, to 1 to enable progress
messages while the driver probes for devices,
or to 2 for full debug logging. (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:
-
- pg.drive0
- pg.drive1
- pg.drive2
- pg.drive3
+ 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:
+
+ pg.drive0
+ pg.drive1
+ pg.drive2
+ pg.drive3
- In addition, you can use the parameter pg.disable to disable
- the driver entirely.
+ In addition, you can use the parameter pg.disable to disable
+ the driver entirely.
*/
@@ -175,9 +175,9 @@
#include "setup.h"
static STT pg_stt[5] = {{"drive0",6,drive0},
- {"drive1",6,drive1},
- {"drive2",6,drive2},
- {"drive3",6,drive3},
+ {"drive1",6,drive1},
+ {"drive2",6,drive2},
+ {"drive3",6,drive3},
{"disable",1,&disable}};
void pg_setup( char *str, int *ints)
@@ -221,9 +221,9 @@
static int pg_open(struct inode *inode, struct file *file);
static int pg_release (struct inode *inode, struct file *file);
static ssize_t pg_read(struct file * filp, char * buf,
- size_t count, loff_t *ppos);
+ size_t count, loff_t *ppos);
static ssize_t pg_write(struct file * filp, const char * buf,
- size_t count, loff_t *ppos);
+ size_t count, loff_t *ppos);
static int pg_detect(void);
static int pg_identify (int unit, int log);
@@ -257,39 +257,40 @@
/* kernel glue structures */
static struct file_operations pg_fops = {
- NULL, /* lseek - default */
- pg_read, /* read */
- pg_write, /* write */
- NULL, /* readdir - bad */
- NULL, /* select */
- NULL, /* ioctl */
- NULL, /* mmap */
- pg_open, /* open */
- pg_release, /* release */
- NULL, /* fsync */
- NULL, /* fasync */
- NULL, /* media change ? */
- NULL /* revalidate new media */
+ NULL, /* lseek - default */
+ pg_read, /* read */
+ pg_write, /* write */
+ NULL, /* readdir - bad */
+ NULL, /* select */
+ NULL, /* ioctl */
+ NULL, /* mmap */
+ pg_open, /* open */
+ NULL, /* flush */
+ pg_release, /* release */
+ NULL, /* fsync */
+ NULL, /* fasync */
+ NULL, /* media change ? */
+ NULL /* revalidate new media */
};
void pg_init_units( void )
{ int unit, j;
- pg_drive_count = 0;
- for (unit=0;unit<PG_UNITS;unit++) {
- PG.pi = & PG.pia;
- PG.access = 0;
- PG.busy = 0;
- PG.present = 0;
+ pg_drive_count = 0;
+ for (unit=0;unit<PG_UNITS;unit++) {
+ PG.pi = & PG.pia;
+ PG.access = 0;
+ PG.busy = 0;
+ PG.present = 0;
PG.bufptr = NULL;
PG.drive = DU[D_SLV];
- j = 0;
- while ((j < PG_NAMELEN-2) && (PG.name[j]=name[j])) j++;
- PG.name[j++] = '0' + unit;
- PG.name[j] = 0;
- if (DU[D_PRT]) pg_drive_count++;
- }
+ j = 0;
+ while ((j < PG_NAMELEN-2) && (PG.name[j]=name[j])) j++;
+ PG.name[j++] = '0' + unit;
+ PG.name[j] = 0;
+ if (DU[D_PRT]) pg_drive_count++;
+ }
}
int pg_init (void) /* preliminary initialisation */
@@ -302,15 +303,15 @@
if (pg_detect()) return -1;
- if (register_chrdev(major,name,&pg_fops)) {
- printk("pg_init: unable to get major number %d\n",
- major);
- for (unit=0;unit<PG_UNITS;unit++)
- if (PG.present) pi_release(PI);
- return -1;
- }
+ if (register_chrdev(major,name,&pg_fops)) {
+ printk("pg_init: unable to get major number %d\n",
+ major);
+ for (unit=0;unit<PG_UNITS;unit++)
+ if (PG.present) pi_release(PI);
+ return -1;
+ }
- return 0;
+ return 0;
}
#ifdef MODULE
@@ -323,16 +324,16 @@
{ int err;
- err = pg_init();
+ err = pg_init();
- return err;
+ return err;
}
void cleanup_module(void)
{ int unit;
- unregister_chrdev(major,name);
+ unregister_chrdev(major,name);
for (unit=0;unit<PG_UNITS;unit++)
if (PG.present) pi_release(PI);
@@ -348,8 +349,8 @@
static void pg_sleep( int cs )
{ current->state = TASK_INTERRUPTIBLE;
- current->timeout = jiffies + cs;
- schedule();
+ current->timeout = jiffies + cs;
+ schedule();
}
static int pg_wait( int unit, int go, int stop, int tmo, char * msg )
@@ -358,26 +359,26 @@
PG.status = 0;
- j = 0;
- while ((((r=RR(1,6))&go)||(stop&&(!(r&stop))))&&(jiffies<tmo)) {
- if (j++ < PG_SPIN) udelay(PG_SPIN_DEL);
+ j = 0;
+ while ((((r=RR(1,6))&go)||(stop&&(!(r&stop))))&&(jiffies<tmo)) {
+ if (j++ < PG_SPIN) udelay(PG_SPIN_DEL);
else pg_sleep(1);
}
- if ((r&(STAT_ERR&stop))||(jiffies>=tmo)) {
- s = RR(0,7);
- e = RR(0,1);
- p = RR(0,2);
- if (verbose > 1)
+ if ((r&(STAT_ERR&stop))||(jiffies>=tmo)) {
+ s = RR(0,7);
+ e = RR(0,1);
+ p = RR(0,2);
+ if (verbose > 1)
printk("%s: %s: stat=0x%x err=0x%x phase=%d%s\n",
- PG.name,msg,s,e,p,(jiffies>=tmo)?" timeout":"");
+ PG.name,msg,s,e,p,(jiffies>=tmo)?" timeout":"");
- if (jiffies>=tmo) e |= 0x100;
+ if (jiffies>=tmo) e |= 0x100;
PG.status = (e >> 4) & 0xff;
- return -1;
- }
- return 0;
+ return -1;
+ }
+ return 0;
}
static int pg_command( int unit, char * cmd, int dlen, int tmo )
@@ -386,64 +387,64 @@
pi_connect(PI);
- WR(0,6,DRIVE);
+ WR(0,6,DRIVE);
+
+ if (pg_wait(unit,STAT_BUSY|STAT_DRQ,0,tmo,"before command")) {
+ pi_disconnect(PI);
+ return -1;
+ }
+
+ WR(0,4,dlen % 256);
+ WR(0,5,dlen / 256);
+ WR(0,7,0xa0); /* ATAPI packet command */
+
+ if (pg_wait(unit,STAT_BUSY,STAT_DRQ,tmo,"command DRQ")) {
+ pi_disconnect(PI);
+ return -1;
+ }
- if (pg_wait(unit,STAT_BUSY|STAT_DRQ,0,tmo,"before command")) {
- pi_disconnect(PI);
- return -1;
- }
-
- WR(0,4,dlen % 256);
- WR(0,5,dlen / 256);
- WR(0,7,0xa0); /* ATAPI packet command */
-
- if (pg_wait(unit,STAT_BUSY,STAT_DRQ,tmo,"command DRQ")) {
- pi_disconnect(PI);
- return -1;
- }
-
- if (RR(0,2) != 1) {
- printk("%s: command phase error\n",PG.name);
- pi_disconnect(PI);
- return -1;
- }
+ if (RR(0,2) != 1) {
+ printk("%s: command phase error\n",PG.name);
+ pi_disconnect(PI);
+ return -1;
+ }
- pi_write_block(PI,cmd,12);
+ pi_write_block(PI,cmd,12);
if (verbose > 1) {
printk("%s: Command sent, dlen=%d packet= ", PG.name,dlen);
for (k=0;k<12;k++) printk("%02x ",cmd[k]&0xff);
printk("\n");
}
- return 0;
+ return 0;
}
static int pg_completion( int unit, char * buf, int tmo)
{ int r, d, n, p;
- r = pg_wait(unit,STAT_BUSY,STAT_DRQ|STAT_READY|STAT_ERR,
+ r = pg_wait(unit,STAT_BUSY,STAT_DRQ|STAT_READY|STAT_ERR,
tmo,"completion");
PG.dlen = 0;
- while (RR(0,7)&STAT_DRQ) {
- d = (RR(0,4)+256*RR(0,5));
- n = ((d+3)&0xfffc);
+ while (RR(0,7)&STAT_DRQ) {
+ d = (RR(0,4)+256*RR(0,5));
+ n = ((d+3)&0xfffc);
p = RR(0,2)&3;
if (p == 0) pi_write_block(PI,buf,n);
if (p == 2) pi_read_block(PI,buf,n);
if (verbose > 1) printk("%s: %s %d bytes\n",PG.name,
p?"Read":"Write",n);
- PG.dlen += (1-p)*d;
- buf += d;
- r = pg_wait(unit,STAT_BUSY,STAT_DRQ|STAT_READY|STAT_ERR,
- tmo,"completion");
- }
+ PG.dlen += (1-p)*d;
+ buf += d;
+ r = pg_wait(unit,STAT_BUSY,STAT_DRQ|STAT_READY|STAT_ERR,
+ tmo,"completion");
+ }
- pi_disconnect(PI);
+ pi_disconnect(PI);
- return r;
+ return r;
}
static int pg_reset( int unit )
@@ -457,9 +458,9 @@
pg_sleep(2);
- k = 0;
- while ((k++ < PG_RESET_TMO) && (RR(1,6)&STAT_BUSY))
- pg_sleep(1);
+ k = 0;
+ while ((k++ < PG_RESET_TMO) && (RR(1,6)&STAT_BUSY))
+ pg_sleep(1);
flg = 1;
for(i=0;i<5;i++) flg &= (RR(0,i+1) == expect[i]);
@@ -494,7 +495,7 @@
char id_cmd[12] = { ATAPI_IDENTIFY,0,0,0,36,0,0,0,0,0,0,0};
char buf[36];
- s = pg_command(unit,id_cmd,36,jiffies+PG_TMO);
+ s = pg_command(unit,id_cmd,36,jiffies+PG_TMO);
if (s) return -1;
s = pg_completion(unit,buf,jiffies+PG_TMO);
if (s) return -1;
@@ -502,7 +503,7 @@
if (log) {
xs(buf,mf,8,8);
xs(buf,id,16,16);
- printk("%s: %s %s, %s\n",PG.name,mf,id,ms[PG.drive]);
+ printk("%s: %s %s, %s\n",PG.name,mf,id,ms[PG.drive]);
}
return 0;
@@ -511,7 +512,7 @@
static int pg_probe( int unit )
/* returns 0, with id set if drive is detected
- -1, if drive detection failed
+ -1, if drive detection failed
*/
{ if (PG.drive == -1) {
@@ -520,7 +521,7 @@
} else {
if (!pg_reset(unit)) return pg_identify(unit,1);
}
- return -1;
+ return -1;
}
static int pg_detect( void )
@@ -534,22 +535,22 @@
if (pg_drive_count == 0) {
unit = 0;
if (pi_init(PI,1,-1,-1,-1,-1,-1,pg_scratch,
- PI_PG,verbose,PG.name)) {
- if (!pg_probe(unit)) {
+ PI_PG,verbose,PG.name)) {
+ if (!pg_probe(unit)) {
PG.present = 1;
k++;
- } else pi_release(PI);
+ } else pi_release(PI);
}
} else for (unit=0;unit<PG_UNITS;unit++) if (DU[D_PRT])
if (pi_init(PI,0,DU[D_PRT],DU[D_MOD],DU[D_UNI],
DU[D_PRO],DU[D_DLY],pg_scratch,PI_PG,verbose,
PG.name)) {
- if (!pg_probe(unit)) {
- PG.present = 1;
- k++;
- } else pi_release(PI);
- }
+ if (!pg_probe(unit)) {
+ PG.present = 1;
+ k++;
+ } else pi_release(PI);
+ }
if (k) return 0;
@@ -563,16 +564,16 @@
{ int unit = DEVICE_NR(inode->i_rdev);
- if ((unit >= PG_UNITS) || (!PG.present)) return -ENODEV;
+ if ((unit >= PG_UNITS) || (!PG.present)) return -ENODEV;
- PG.access++;
+ PG.access++;
if (PG.access > 1) {
PG.access--;
return -EBUSY;
}
- MOD_INC_USE_COUNT;
+ MOD_INC_USE_COUNT;
if (PG.busy) {
pg_reset(unit);
@@ -590,34 +591,34 @@
return -ENOMEM;
}
- return 0;
+ return 0;
}
static int pg_release (struct inode *inode, struct file *file)
{
- int unit = DEVICE_NR(inode->i_rdev);
+ int unit = DEVICE_NR(inode->i_rdev);
- if ((unit >= PG_UNITS) || (PG.access <= 0))
- return -EINVAL;
+ if ((unit >= PG_UNITS) || (PG.access <= 0))
+ return -EINVAL;
PG.access--;
kfree(PG.bufptr);
PG.bufptr = NULL;
- MOD_DEC_USE_COUNT;
+ MOD_DEC_USE_COUNT;
return 0;
}
static ssize_t pg_write(struct file * filp, const char * buf,
- size_t count, loff_t *ppos)
+ size_t count, loff_t *ppos)
{ struct inode *ino = filp->f_dentry->d_inode;
- int unit = DEVICE_NR(ino->i_rdev);
- struct pg_write_hdr hdr;
- int hs = sizeof(hdr);
+ int unit = DEVICE_NR(ino->i_rdev);
+ struct pg_write_hdr hdr;
+ int hs = sizeof(hdr);
if (PG.busy) return -EBUSY;
if (count < hs) return -EINVAL;
@@ -652,7 +653,7 @@
}
static ssize_t pg_read(struct file * filp, char * buf,
- size_t count, loff_t *ppos)
+ size_t count, loff_t *ppos)
{ struct inode *ino = filp->f_dentry->d_inode;
int unit = DEVICE_NR(ino->i_rdev);
@@ -673,7 +674,7 @@
copy = 0;
if (hdr.dlen < 0) {
- hdr.dlen = -1 * hdr.dlen;
+ hdr.dlen = -1 * hdr.dlen;
copy = hdr.dlen;
if (copy > (count - hs)) copy = count - hs;
}
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