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path: root/drivers/block/paride/pt.c
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-rw-r--r--drivers/block/paride/pt.c1024
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diff --git a/drivers/block/paride/pt.c b/drivers/block/paride/pt.c
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index 00000000000..8fbd6922fe0
--- /dev/null
+++ b/drivers/block/paride/pt.c
@@ -0,0 +1,1024 @@
+/*
+ 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/devfs_fs_kernel.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/mtio.h>
+#include <linux/device.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 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 __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 struct file_operations pt_fops = {
+ .owner = THIS_MODULE,
+ .read = pt_read,
+ .write = pt_write,
+ .ioctl = pt_ioctl,
+ .open = pt_open,
+ .release = pt_release,
+};
+
+/* sysfs class support */
+static struct class_simple *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)
+{
+ current->state = TASK_INTERRUPTIBLE;
+ schedule_timeout(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;
+
+ 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, err = 0;
+
+ if (disable) {
+ err = -1;
+ goto out;
+ }
+
+ if (pt_detect()) {
+ err = -1;
+ goto out;
+ }
+
+ if (register_chrdev(major, name, &pt_fops)) {
+ 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);
+ err = -1;
+ goto out;
+ }
+ pt_class = class_simple_create(THIS_MODULE, "pt");
+ if (IS_ERR(pt_class)) {
+ err = PTR_ERR(pt_class);
+ goto out_chrdev;
+ }
+
+ devfs_mk_dir("pt");
+ for (unit = 0; unit < PT_UNITS; unit++)
+ if (pt[unit].present) {
+ class_simple_device_add(pt_class, MKDEV(major, unit),
+ NULL, "pt%d", unit);
+ err = devfs_mk_cdev(MKDEV(major, unit),
+ S_IFCHR | S_IRUSR | S_IWUSR,
+ "pt/%d", unit);
+ if (err) {
+ class_simple_device_remove(MKDEV(major, unit));
+ goto out_class;
+ }
+ class_simple_device_add(pt_class, MKDEV(major, unit + 128),
+ NULL, "pt%dn", unit);
+ err = devfs_mk_cdev(MKDEV(major, unit + 128),
+ S_IFCHR | S_IRUSR | S_IWUSR,
+ "pt/%dn", unit);
+ if (err) {
+ class_simple_device_remove(MKDEV(major, unit + 128));
+ goto out_class;
+ }
+ }
+ goto out;
+
+out_class:
+ class_simple_destroy(pt_class);
+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_simple_device_remove(MKDEV(major, unit));
+ devfs_remove("pt/%d", unit);
+ class_simple_device_remove(MKDEV(major, unit + 128));
+ devfs_remove("pt/%dn", unit);
+ }
+ class_simple_destroy(pt_class);
+ devfs_remove("pt");
+ 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 v1.2.3 (git 2.25.1) at 2024-04-23 09:39:08 +0000