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path: root/drivers/block/paride/pt.c
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-rw-r--r--drivers/block/paride/pt.c1024
1 files changed, 0 insertions, 1024 deletions
diff --git a/drivers/block/paride/pt.c b/drivers/block/paride/pt.c
deleted file mode 100644
index e815312a00ad..000000000000
--- a/drivers/block/paride/pt.c
+++ /dev/null
@@ -1,1024 +0,0 @@
-/*
- 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 override 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
-
-#include <linux/types.h>
-
-/* 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 <linux/uaccess.h>
-
-module_param(verbose, int, 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 */
-static void *par_drv; /* reference of parport driver */
-
-/* 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 = 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);
-
- par_drv = pi_register_driver(name);
- if (!par_drv) {
- pr_err("failed to register %s driver\n", name);
- return -1;
- }
-
- 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;
-
- pi_unregister_driver(par_drv);
- 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)
generated by cgit (git 2.34.1) at 2024-07-03 17:07:42 +0000