pt.c
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上传日期:2013-04-10
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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};
- static int pt_drive_count;
- #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/errno.h>
- #include <linux/fs.h>
- #include <linux/devfs_fs_kernel.h>
- #include <linux/kernel.h>
- #include <linux/delay.h>
- #include <linux/slab.h>
- #include <linux/mtio.h>
- #include <linux/wait.h>
- #include <linux/smp_lock.h>
- #include <asm/uaccess.h>
- #ifndef MODULE
- #include "setup.h"
- static STT pt_stt[5] = {{"drive0",6,drive0},
- {"drive1",6,drive1},
- {"drive2",6,drive2},
- {"drive3",6,drive3},
- {"disable",1,&disable}};
- void pt_setup( char *str, int *ints)
- { generic_setup(pt_stt,5,str);
- }
- #endif
- MODULE_PARM(verbose,"i");
- MODULE_PARM(major,"i");
- MODULE_PARM(name,"s");
- MODULE_PARM(drive0,"1-6i");
- MODULE_PARM(drive1,"1-6i");
- MODULE_PARM(drive2,"1-6i");
- MODULE_PARM(drive3,"1-6i");
- #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
- int pt_init(void);
- #ifdef MODULE
- void cleanup_module( void );
- #endif
- static int pt_open(struct inode *inode, struct file *file);
- static int pt_ioctl(struct inode *inode,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 * buf,
- size_t count, loff_t *ppos);
- static ssize_t pt_write(struct file * filp, const char * buf,
- size_t count, loff_t *ppos);
- static int pt_detect(void);
- static int pt_identify (int unit);
- /* bits in PT.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 */
- int access; /* count of active opens ... */
- int bs; /* block size */
- int capacity; /* Size of tape in KB */
- int present; /* device present ? */
- char *bufptr;
- char name[PT_NAMELEN]; /* pf0, pf1, ... */
- };
- struct pt_unit pt[PT_UNITS];
- /* 'unit' must be defined in all functions - either as a local or a param */
- #define PT pt[unit]
- #define PI PT.pi
- static char pt_scratch[512]; /* scratch block buffer */
- /* kernel glue structures */
- static struct file_operations pt_fops = {
- owner: THIS_MODULE,
- read: pt_read,
- write: pt_write,
- ioctl: pt_ioctl,
- open: pt_open,
- release: pt_release,
- };
- void pt_init_units( void )
- { int unit, j;
- pt_drive_count = 0;
- for (unit=0;unit<PT_UNITS;unit++) {
- PT.pi = & PT.pia;
- PT.access = 0;
- PT.flags = 0;
- PT.last_sense = 0;
- PT.present = 0;
- PT.bufptr = NULL;
- PT.drive = DU[D_SLV];
- j = 0;
- while ((j < PT_NAMELEN-2) && (PT.name[j]=name[j])) j++;
- PT.name[j++] = '0' + unit;
- PT.name[j] = 0;
- if (DU[D_PRT]) pt_drive_count++;
- }
- }
- static devfs_handle_t devfs_handle;
- int pt_init (void) /* preliminary initialisation */
- { int unit;
- if (disable) return -1;
- pt_init_units();
- if (pt_detect()) return -1;
- if (devfs_register_chrdev(major,name,&pt_fops)) {
- printk("pt_init: unable to get major number %dn",
- major);
- for (unit=0;unit<PT_UNITS;unit++)
- if (PT.present) pi_release(PI);
- return -1;
- }
- devfs_handle = devfs_mk_dir (NULL, "pt", NULL);
- devfs_register_series (devfs_handle, "%u", 4, DEVFS_FL_DEFAULT,
- major, 0, S_IFCHR | S_IRUSR | S_IWUSR,
- &pt_fops, NULL);
- devfs_register_series (devfs_handle, "%un", 4, DEVFS_FL_DEFAULT,
- major, 128, S_IFCHR | S_IRUSR | S_IWUSR,
- &pt_fops, NULL);
- return 0;
- }
- #ifdef MODULE
- /* Glue for modules ... */
- void cleanup_module(void);
- int init_module(void)
- { int err;
- #ifdef PARIDE_JUMBO
- { extern paride_init();
- paride_init();
- }
- #endif
- err = pt_init();
- return err;
- }
- void cleanup_module(void)
- { int unit;
- devfs_unregister (devfs_handle);
- devfs_unregister_chrdev(major,name);
- for (unit=0;unit<PT_UNITS;unit++)
- if (PT.present) pi_release(PI);
- }
- #endif
- #define WR(c,r,v) pi_write_regr(PI,c,r,v)
- #define RR(c,r) (pi_read_regr(PI,c,r))
- #define DRIVE (0xa0+0x10*PT.drive)
- static int pt_wait( int unit, int go, int stop, char * fun, char * msg )
- { int j, r, e, s, p;
- j = 0;
- while ((((r=RR(1,6))&go)||(stop&&(!(r&stop))))&&(j++<PT_SPIN))
- udelay(PT_SPIN_DEL);
- if ((r&(STAT_ERR&stop))||(j>=PT_SPIN)) {
- s = RR(0,7);
- e = RR(0,1);
- p = RR(0,2);
- if (j >= PT_SPIN) e |= 0x100;
- if (fun) printk("%s: %s %s: alt=0x%x stat=0x%x err=0x%x"
- " loop=%d phase=%dn",
- PT.name,fun,msg,r,s,e,j,p);
- return (e<<8)+s;
- }
- return 0;
- }
- static int pt_command( int unit, char * cmd, int dlen, char * fun )
- { pi_connect(PI);
- WR(0,6,DRIVE);
- if (pt_wait(unit,STAT_BUSY|STAT_DRQ,0,fun,"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 (pt_wait(unit,STAT_BUSY,STAT_DRQ,fun,"command DRQ")) {
- pi_disconnect(PI);
- return -1;
- }
- if (RR(0,2) != 1) {
- printk("%s: %s: command phase errorn",PT.name,fun);
- pi_disconnect(PI);
- return -1;
- }
- pi_write_block(PI,cmd,12);
- return 0;
- }
- static int pt_completion( int unit, char * buf, char * fun )
- { int r, s, n, p;
- r = pt_wait(unit,STAT_BUSY,STAT_DRQ|STAT_READY|STAT_ERR,
- fun,"completion");
- if (RR(0,7)&STAT_DRQ) {
- n = (((RR(0,4)+256*RR(0,5))+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);
- }
- s = pt_wait(unit,STAT_BUSY,STAT_READY|STAT_ERR,fun,"data done");
- pi_disconnect(PI);
- return (r?r:s);
- }
- static void pt_req_sense( int unit, 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(unit,rs_cmd,16,"Request sense");
- mdelay(1);
- if (!r) pt_completion(unit,buf,"Request sense");
- PT.last_sense = -1;
- if (!r) {
- if (!quiet) printk("%s: Sense key: %x, ASC: %x, ASQ: %xn",
- PT.name,buf[2]&0xf,buf[12],buf[13]);
- PT.last_sense = (buf[2]&0xf) | ((buf[12]&0xff)<<8)
- | ((buf[13]&0xff)<<16) ;
- }
- }
- static int pt_atapi( int unit, char * cmd, int dlen, char * buf, char * fun )
- { int r;
- r = pt_command(unit,cmd,dlen,fun);
- mdelay(1);
- if (!r) r = pt_completion(unit,buf,fun);
- if (r) pt_req_sense(unit,!fun);
-
- return r;
- }
- static void pt_sleep( int cs )
- { current->state = TASK_INTERRUPTIBLE;
- schedule_timeout(cs);
- }
- static int pt_poll_dsc( int unit, int pause, int tmo, char *msg )
- { int k, e, s;
- k = 0; e = 0; s = 0;
- while (k < tmo) {
- pt_sleep(pause);
- k++;
- pi_connect(PI);
- WR(0,6,DRIVE);
- s = RR(0,7);
- e = RR(0,1);
- pi_disconnect(PI);
- if (s & (STAT_ERR|STAT_SEEK)) break;
- }
- if ((k >= tmo) || (s & STAT_ERR)) {
- if (k >= tmo) printk("%s: %s DSC timeoutn",PT.name,msg);
- else printk("%s: %s stat=0x%x err=0x%xn",PT.name,msg,s,e);
- pt_req_sense(unit,0);
- return 0;
- }
- return 1;
- }
- static void pt_media_access_cmd( int unit, int tmo, char *cmd, char *fun)
- { if (pt_command(unit,cmd,0,fun)) {
- pt_req_sense(unit,0);
- return;
- }
- pi_disconnect(PI);
- pt_poll_dsc(unit,HZ,tmo,fun);
- }
- static void pt_rewind( int unit )
- { char rw_cmd[12] = {ATAPI_REWIND,0,0,0,0,0,0,0,0,0,0,0};
- pt_media_access_cmd(unit,PT_REWIND_TMO,rw_cmd,"rewind");
- }
- static void pt_write_fm( int unit )
- { char wm_cmd[12] = {ATAPI_WFM,0,0,0,1,0,0,0,0,0,0,0};
- pt_media_access_cmd(unit,PT_TMO,wm_cmd,"write filemark");
- }
- #define DBMSG(msg) ((verbose>1)?(msg):NULL)
- static int pt_reset( int unit )
- { int i, k, flg;
- int expect[5] = {1,1,1,0x14,0xeb};
- pi_connect(PI);
- WR(0,6,DRIVE);
- WR(0,7,8);
- pt_sleep(20*HZ/1000);
- k = 0;
- while ((k++ < PT_RESET_TMO) && (RR(1,6)&STAT_BUSY))
- pt_sleep(HZ/10);
- flg = 1;
- for(i=0;i<5;i++) flg &= (RR(0,i+1) == expect[i]);
- if (verbose) {
- printk("%s: Reset (%d) signature = ",PT.name,k);
- for (i=0;i<5;i++) printk("%3x",RR(0,i+1));
- if (!flg) printk(" (incorrect)");
- printk("n");
- }
-
- pi_disconnect(PI);
- return flg-1;
- }
- static int pt_ready_wait( int unit, 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) {
- PT.last_sense = 0;
- pt_atapi(unit,tr_cmd,0,NULL,DBMSG("test unit ready"));
- p = PT.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( int unit )
- { 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(unit,id_cmd,36,buf,"identify");
- if (s) return -1;
- dt = buf[0] & 0x1f;
- if (dt != 1) {
- if (verbose)
- printk("%s: Drive %d, unsupported type %dn",
- PT.name,PT.drive,dt);
- return -1;
- }
- xs(buf,mf,8,8);
- xs(buf,id,16,16);
- PT.flags = 0;
- PT.capacity = 0;
- PT.bs = 0;
- if (!pt_ready_wait(unit,PT_READY_TMO)) PT.flags |= PT_MEDIA;
- if (!pt_atapi(unit,ms_cmd,36,buf,"mode sense")) {
- if (!(buf[2] & 0x80)) PT.flags |= PT_WRITE_OK;
- PT.bs = xn(buf,10,2);
- }
- if (!pt_atapi(unit,ls_cmd,36,buf,"log sense"))
- PT.capacity = xn(buf,24,4);
- printk("%s: %s %s, %s",
- PT.name,mf,id,ms[PT.drive]);
- if (!(PT.flags & PT_MEDIA))
- printk(", no median");
- else { if (!(PT.flags & PT_WRITE_OK)) printk(", RO");
- printk(", blocksize %d, %d MBn",
- PT.bs,PT.capacity/1024);
- }
- return 0;
- }
- static int pt_probe( int unit )
- /* returns 0, with id set if drive is detected
- -1, if drive detection failed
- */
- { if (PT.drive == -1) {
- for (PT.drive=0;PT.drive<=1;PT.drive++)
- if (!pt_reset(unit)) return pt_identify(unit);
- } else {
- if (!pt_reset(unit)) return pt_identify(unit);
- }
- return -1;
- }
- static int pt_detect( void )
- { int k, unit;
- printk("%s: %s version %s, major %dn",
- name,name,PT_VERSION,major);
- k = 0;
- if (pt_drive_count == 0) {
- unit = 0;
- if (pi_init(PI,1,-1,-1,-1,-1,-1,pt_scratch,
- PI_PT,verbose,PT.name)) {
- if (!pt_probe(unit)) {
- PT.present = 1;
- k++;
- } else pi_release(PI);
- }
- } else for (unit=0;unit<PT_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],pt_scratch,PI_PT,verbose,
- PT.name)) {
- if (!pt_probe(unit)) {
- PT.present = 1;
- k++;
- } else pi_release(PI);
- }
- if (k) return 0;
- printk("%s: No ATAPI tape drive detectedn",name);
- return -1;
- }
- #define DEVICE_NR(dev) (MINOR(dev) % 128)
- static int pt_open (struct inode *inode, struct file *file)
- { int unit = DEVICE_NR(inode->i_rdev);
- if ((unit >= PT_UNITS) || (!PT.present)) return -ENODEV;
- PT.access++;
- if (PT.access > 1) {
- PT.access--;
- return -EBUSY;
- }
- pt_identify(unit);
- if (!PT.flags & PT_MEDIA) {
- PT.access--;
- return -ENODEV;
- }
- if ((!PT.flags & PT_WRITE_OK) && (file ->f_mode & 2)) {
- PT.access--;
- return -EROFS;
- }
- if (!(MINOR(inode->i_rdev) & 128))
- PT.flags |= PT_REWIND;
- PT.bufptr = kmalloc(PT_BUFSIZE,GFP_KERNEL);
- if (PT.bufptr == NULL) {
- PT.access--;
- printk("%s: buffer allocation failedn",PT.name);
- return -ENOMEM;
- }
- return 0;
- }
- static int pt_ioctl(struct inode *inode,struct file *file,
- unsigned int cmd, unsigned long arg)
- {
- int unit;
- struct mtop mtop;
- if (!inode || !inode->i_rdev)
- return -EINVAL;
- unit = DEVICE_NR(inode->i_rdev);
- if (unit >= PT_UNITS)
- return -EINVAL;
- if (!PT.present)
- return -ENODEV;
- switch (cmd) {
- case MTIOCTOP:
- if (copy_from_user((char *)&mtop, (char *)arg,
- sizeof(struct mtop))) return -EFAULT;
- switch (mtop.mt_op) {
- case MTREW:
- pt_rewind(unit);
- return 0;
- case MTWEOF:
- pt_write_fm(unit);
- return 0;
- default:
- printk("%s: Unimplemented mt_op %dn",PT.name,
- mtop.mt_op);
- return -EINVAL;
- }
- default:
- printk("%s: Unimplemented ioctl 0x%xn",PT.name,cmd);
- return -EINVAL;
- }
- }
- static int pt_release (struct inode *inode, struct file *file)
- {
- int unit = DEVICE_NR(inode->i_rdev);
- if ((unit >= PT_UNITS) || (PT.access <= 0))
- return -EINVAL;
- lock_kernel();
- if (PT.flags & PT_WRITING) pt_write_fm(unit);
- if (PT.flags & PT_REWIND) pt_rewind(unit);
- PT.access--;
- kfree(PT.bufptr);
- PT.bufptr = NULL;
- unlock_kernel();
- return 0;
- }
- static ssize_t pt_read(struct file * filp, char * buf,
- size_t count, loff_t *ppos)
- {
- struct inode *ino = filp->f_dentry->d_inode;
- int unit = DEVICE_NR(ino->i_rdev);
- 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 (!(PT.flags & (PT_READING|PT_WRITING))) {
- PT.flags |= PT_READING;
- if (pt_atapi(unit,rd_cmd,0,NULL,"start read-ahead"))
- return -EIO;
- } else if (PT.flags & PT_WRITING) return -EIO;
- if (PT.flags & PT_EOF) return 0;
- t = 0;
- while (count > 0) {
- if (!pt_poll_dsc(unit,HZ/100,PT_TMO,"read")) return -EIO;
- n = count;
- if (n > 32768) n = 32768; /* max per command */
- b = (n-1+PT.bs)/PT.bs;
- n = b*PT.bs; /* rounded up to even block */
- rd_cmd[4] = b;
- r = pt_command(unit,rd_cmd,n,"read");
- mdelay(1);
- if (r) {
- pt_req_sense(unit,0);
- return -EIO;
- }
- while (1) {
- r = pt_wait(unit,STAT_BUSY,STAT_DRQ|STAT_ERR|STAT_READY,
- DBMSG("read DRQ"),"");
- if (r & STAT_SENSE) {
- pi_disconnect(PI);
- pt_req_sense(unit,0);
- return -EIO;
- }
- if (r) PT.flags |= PT_EOF;
- s = RR(0,7);
- if (!(s & STAT_DRQ)) break;
- n = (RR(0,4)+256*RR(0,5));
- p = (RR(0,2)&3);
- if (p != 2) {
- pi_disconnect(PI);
- printk("%s: Phase error on read: %dn",PT.name,p);
- return -EIO;
- }
- while (n > 0) {
- k = n;
- if (k > PT_BUFSIZE) k = PT_BUFSIZE;
- pi_read_block(PI,PT.bufptr,k);
- n -= k;
- b = k;
- if (b > count) b = count;
- if (copy_to_user(buf + t, PT.bufptr, b)) {
- pi_disconnect(PI);
- return -EFAULT;
- }
- t += b;
- count -= b;
- }
- }
- pi_disconnect(PI);
- if (PT.flags & PT_EOF) break;
- }
- return t;
- }
- static ssize_t pt_write(struct file * filp, const char * buf,
- size_t count, loff_t *ppos)
- {
- struct inode *ino = filp->f_dentry->d_inode;
- int unit = DEVICE_NR(ino->i_rdev);
- 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 (!(PT.flags & PT_WRITE_OK)) return -EROFS;
- if (!(PT.flags & (PT_READING|PT_WRITING))) {
- PT.flags |= PT_WRITING;
- if (pt_atapi(unit,wr_cmd,0,NULL,"start buffer-available mode"))
- return -EIO;
- } else if (PT.flags&PT_READING) return -EIO;
- if (PT.flags & PT_EOF) return -ENOSPC;
- t = 0;
- while (count > 0) {
- if (!pt_poll_dsc(unit,HZ/100,PT_TMO,"write")) return -EIO;
- n = count;
- if (n > 32768) n = 32768; /* max per command */
- b = (n-1+PT.bs)/PT.bs;
- n = b*PT.bs; /* rounded up to even block */
- wr_cmd[4] = b;
- r = pt_command(unit,wr_cmd,n,"write");
- mdelay(1);
- if (r) { /* error delivering command only */
- pt_req_sense(unit,0);
- return -EIO;
- }
- while (1) {
- r = pt_wait(unit,STAT_BUSY,STAT_DRQ|STAT_ERR|STAT_READY,
- DBMSG("write DRQ"),NULL);
- if (r & STAT_SENSE) {
- pi_disconnect(PI);
- pt_req_sense(unit,0);
- return -EIO;
- }
- if (r) PT.flags |= PT_EOF;
- s = RR(0,7);
- if (!(s & STAT_DRQ)) break;
- n = (RR(0,4)+256*RR(0,5));
- p = (RR(0,2)&3);
- if (p != 0) {
- pi_disconnect(PI);
- printk("%s: Phase error on write: %d n",PT.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(PT.bufptr, buf + t, b)) {
- pi_disconnect(PI);
- return -EFAULT;
- }
- pi_write_block(PI,PT.bufptr,k);
- t += b;
- count -= b;
- n -= k;
- }
- }
- pi_disconnect(PI);
- if (PT.flags & PT_EOF) break;
- }
- return t;
- }
- /* end of pt.c */
- MODULE_LICENSE("GPL");