Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | pt.c (c) 1998 Grant R. Guenther <grant@torque.net> |
| 3 | Under the terms of the GNU General Public License. |
| 4 | |
| 5 | This is the high-level driver for parallel port ATAPI tape |
| 6 | drives based on chips supported by the paride module. |
| 7 | |
| 8 | The driver implements both rewinding and non-rewinding |
| 9 | devices, filemarks, and the rewind ioctl. It allocates |
| 10 | a small internal "bounce buffer" for each open device, but |
| 11 | otherwise expects buffering and blocking to be done at the |
| 12 | user level. As with most block-structured tapes, short |
| 13 | writes are padded to full tape blocks, so reading back a file |
| 14 | may return more data than was actually written. |
| 15 | |
| 16 | By default, the driver will autoprobe for a single parallel |
| 17 | port ATAPI tape drive, but if their individual parameters are |
| 18 | specified, the driver can handle up to 4 drives. |
| 19 | |
| 20 | The rewinding devices are named /dev/pt0, /dev/pt1, ... |
| 21 | while the non-rewinding devices are /dev/npt0, /dev/npt1, etc. |
| 22 | |
| 23 | The behaviour of the pt driver can be altered by setting |
| 24 | some parameters from the insmod command line. The following |
| 25 | parameters are adjustable: |
| 26 | |
| 27 | drive0 These four arguments can be arrays of |
| 28 | drive1 1-6 integers as follows: |
| 29 | drive2 |
| 30 | drive3 <prt>,<pro>,<uni>,<mod>,<slv>,<dly> |
| 31 | |
| 32 | Where, |
| 33 | |
| 34 | <prt> is the base of the parallel port address for |
| 35 | the corresponding drive. (required) |
| 36 | |
| 37 | <pro> is the protocol number for the adapter that |
| 38 | supports this drive. These numbers are |
| 39 | logged by 'paride' when the protocol modules |
| 40 | are initialised. (0 if not given) |
| 41 | |
| 42 | <uni> for those adapters that support chained |
| 43 | devices, this is the unit selector for the |
| 44 | chain of devices on the given port. It should |
| 45 | be zero for devices that don't support chaining. |
| 46 | (0 if not given) |
| 47 | |
| 48 | <mod> this can be -1 to choose the best mode, or one |
| 49 | of the mode numbers supported by the adapter. |
| 50 | (-1 if not given) |
| 51 | |
| 52 | <slv> ATAPI devices can be jumpered to master or slave. |
| 53 | Set this to 0 to choose the master drive, 1 to |
| 54 | choose the slave, -1 (the default) to choose the |
| 55 | first drive found. |
| 56 | |
| 57 | <dly> some parallel ports require the driver to |
| 58 | go more slowly. -1 sets a default value that |
| 59 | should work with the chosen protocol. Otherwise, |
| 60 | set this to a small integer, the larger it is |
| 61 | the slower the port i/o. In some cases, setting |
| 62 | this to zero will speed up the device. (default -1) |
| 63 | |
| 64 | major You may use this parameter to overide the |
| 65 | default major number (96) that this driver |
| 66 | will use. Be sure to change the device |
| 67 | name as well. |
| 68 | |
| 69 | name This parameter is a character string that |
| 70 | contains the name the kernel will use for this |
| 71 | device (in /proc output, for instance). |
| 72 | (default "pt"). |
| 73 | |
| 74 | verbose This parameter controls the amount of logging |
| 75 | that the driver will do. Set it to 0 for |
| 76 | normal operation, 1 to see autoprobe progress |
| 77 | messages, or 2 to see additional debugging |
| 78 | output. (default 0) |
| 79 | |
| 80 | If this driver is built into the kernel, you can use |
| 81 | the following command line parameters, with the same values |
| 82 | as the corresponding module parameters listed above: |
| 83 | |
| 84 | pt.drive0 |
| 85 | pt.drive1 |
| 86 | pt.drive2 |
| 87 | pt.drive3 |
| 88 | |
| 89 | In addition, you can use the parameter pt.disable to disable |
| 90 | the driver entirely. |
| 91 | |
| 92 | */ |
| 93 | |
| 94 | /* Changes: |
| 95 | |
| 96 | 1.01 GRG 1998.05.06 Round up transfer size, fix ready_wait, |
| 97 | loosed interpretation of ATAPI standard |
| 98 | for clearing error status. |
| 99 | Eliminate sti(); |
| 100 | 1.02 GRG 1998.06.16 Eliminate an Ugh. |
| 101 | 1.03 GRG 1998.08.15 Adjusted PT_TMO, use HZ in loop timing, |
| 102 | extra debugging |
| 103 | 1.04 GRG 1998.09.24 Repair minor coding error, added jumbo support |
| 104 | |
| 105 | */ |
| 106 | |
| 107 | #define PT_VERSION "1.04" |
| 108 | #define PT_MAJOR 96 |
| 109 | #define PT_NAME "pt" |
| 110 | #define PT_UNITS 4 |
| 111 | |
| 112 | /* Here are things one can override from the insmod command. |
| 113 | Most are autoprobed by paride unless set here. Verbose is on |
| 114 | by default. |
| 115 | |
| 116 | */ |
| 117 | |
| 118 | static int verbose = 0; |
| 119 | static int major = PT_MAJOR; |
| 120 | static char *name = PT_NAME; |
| 121 | static int disable = 0; |
| 122 | |
| 123 | static int drive0[6] = { 0, 0, 0, -1, -1, -1 }; |
| 124 | static int drive1[6] = { 0, 0, 0, -1, -1, -1 }; |
| 125 | static int drive2[6] = { 0, 0, 0, -1, -1, -1 }; |
| 126 | static int drive3[6] = { 0, 0, 0, -1, -1, -1 }; |
| 127 | |
| 128 | static int (*drives[4])[6] = {&drive0, &drive1, &drive2, &drive3}; |
| 129 | |
| 130 | #define D_PRT 0 |
| 131 | #define D_PRO 1 |
| 132 | #define D_UNI 2 |
| 133 | #define D_MOD 3 |
| 134 | #define D_SLV 4 |
| 135 | #define D_DLY 5 |
| 136 | |
| 137 | #define DU (*drives[unit]) |
| 138 | |
| 139 | /* end of parameters */ |
| 140 | |
| 141 | #include <linux/module.h> |
| 142 | #include <linux/init.h> |
| 143 | #include <linux/fs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | #include <linux/delay.h> |
| 145 | #include <linux/slab.h> |
| 146 | #include <linux/mtio.h> |
| 147 | #include <linux/device.h> |
Tim Schmielau | 4e57b68 | 2005-10-30 15:03:48 -0800 | [diff] [blame] | 148 | #include <linux/sched.h> /* current, TASK_*, schedule_timeout() */ |
Alan Cox | be1fd70 | 2008-07-04 09:51:21 +0200 | [diff] [blame] | 149 | #include <linux/smp_lock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | |
| 151 | #include <asm/uaccess.h> |
| 152 | |
| 153 | module_param(verbose, bool, 0); |
| 154 | module_param(major, int, 0); |
| 155 | module_param(name, charp, 0); |
| 156 | module_param_array(drive0, int, NULL, 0); |
| 157 | module_param_array(drive1, int, NULL, 0); |
| 158 | module_param_array(drive2, int, NULL, 0); |
| 159 | module_param_array(drive3, int, NULL, 0); |
| 160 | |
| 161 | #include "paride.h" |
| 162 | |
| 163 | #define PT_MAX_RETRIES 5 |
| 164 | #define PT_TMO 3000 /* interrupt timeout in jiffies */ |
| 165 | #define PT_SPIN_DEL 50 /* spin delay in micro-seconds */ |
| 166 | #define PT_RESET_TMO 30 /* 30 seconds */ |
| 167 | #define PT_READY_TMO 60 /* 60 seconds */ |
| 168 | #define PT_REWIND_TMO 1200 /* 20 minutes */ |
| 169 | |
| 170 | #define PT_SPIN ((1000000/(HZ*PT_SPIN_DEL))*PT_TMO) |
| 171 | |
| 172 | #define STAT_ERR 0x00001 |
| 173 | #define STAT_INDEX 0x00002 |
| 174 | #define STAT_ECC 0x00004 |
| 175 | #define STAT_DRQ 0x00008 |
| 176 | #define STAT_SEEK 0x00010 |
| 177 | #define STAT_WRERR 0x00020 |
| 178 | #define STAT_READY 0x00040 |
| 179 | #define STAT_BUSY 0x00080 |
| 180 | #define STAT_SENSE 0x1f000 |
| 181 | |
| 182 | #define ATAPI_TEST_READY 0x00 |
| 183 | #define ATAPI_REWIND 0x01 |
| 184 | #define ATAPI_REQ_SENSE 0x03 |
| 185 | #define ATAPI_READ_6 0x08 |
| 186 | #define ATAPI_WRITE_6 0x0a |
| 187 | #define ATAPI_WFM 0x10 |
| 188 | #define ATAPI_IDENTIFY 0x12 |
| 189 | #define ATAPI_MODE_SENSE 0x1a |
| 190 | #define ATAPI_LOG_SENSE 0x4d |
| 191 | |
| 192 | static int pt_open(struct inode *inode, struct file *file); |
Alan Cox | be1fd70 | 2008-07-04 09:51:21 +0200 | [diff] [blame] | 193 | static long pt_ioctl(struct file *file, unsigned int cmd, unsigned long arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | static int pt_release(struct inode *inode, struct file *file); |
| 195 | static ssize_t pt_read(struct file *filp, char __user *buf, |
| 196 | size_t count, loff_t * ppos); |
| 197 | static ssize_t pt_write(struct file *filp, const char __user *buf, |
| 198 | size_t count, loff_t * ppos); |
| 199 | static int pt_detect(void); |
| 200 | |
| 201 | /* bits in tape->flags */ |
| 202 | |
| 203 | #define PT_MEDIA 1 |
| 204 | #define PT_WRITE_OK 2 |
| 205 | #define PT_REWIND 4 |
| 206 | #define PT_WRITING 8 |
| 207 | #define PT_READING 16 |
| 208 | #define PT_EOF 32 |
| 209 | |
| 210 | #define PT_NAMELEN 8 |
| 211 | #define PT_BUFSIZE 16384 |
| 212 | |
| 213 | struct pt_unit { |
| 214 | struct pi_adapter pia; /* interface to paride layer */ |
| 215 | struct pi_adapter *pi; |
| 216 | int flags; /* various state flags */ |
| 217 | int last_sense; /* result of last request sense */ |
| 218 | int drive; /* drive */ |
| 219 | atomic_t available; /* 1 if access is available 0 otherwise */ |
| 220 | int bs; /* block size */ |
| 221 | int capacity; /* Size of tape in KB */ |
| 222 | int present; /* device present ? */ |
| 223 | char *bufptr; |
| 224 | char name[PT_NAMELEN]; /* pf0, pf1, ... */ |
| 225 | }; |
| 226 | |
| 227 | static int pt_identify(struct pt_unit *tape); |
| 228 | |
| 229 | static struct pt_unit pt[PT_UNITS]; |
| 230 | |
| 231 | static char pt_scratch[512]; /* scratch block buffer */ |
| 232 | |
| 233 | /* kernel glue structures */ |
| 234 | |
Arjan van de Ven | 2b8693c | 2007-02-12 00:55:32 -0800 | [diff] [blame] | 235 | static const struct file_operations pt_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | .owner = THIS_MODULE, |
| 237 | .read = pt_read, |
| 238 | .write = pt_write, |
Alan Cox | be1fd70 | 2008-07-04 09:51:21 +0200 | [diff] [blame] | 239 | .unlocked_ioctl = pt_ioctl, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | .open = pt_open, |
| 241 | .release = pt_release, |
| 242 | }; |
| 243 | |
| 244 | /* sysfs class support */ |
gregkh@suse.de | deb3697 | 2005-03-23 09:52:10 -0800 | [diff] [blame] | 245 | static struct class *pt_class; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | |
| 247 | static inline int status_reg(struct pi_adapter *pi) |
| 248 | { |
| 249 | return pi_read_regr(pi, 1, 6); |
| 250 | } |
| 251 | |
| 252 | static inline int read_reg(struct pi_adapter *pi, int reg) |
| 253 | { |
| 254 | return pi_read_regr(pi, 0, reg); |
| 255 | } |
| 256 | |
| 257 | static inline void write_reg(struct pi_adapter *pi, int reg, int val) |
| 258 | { |
| 259 | pi_write_regr(pi, 0, reg, val); |
| 260 | } |
| 261 | |
| 262 | static inline u8 DRIVE(struct pt_unit *tape) |
| 263 | { |
| 264 | return 0xa0+0x10*tape->drive; |
| 265 | } |
| 266 | |
| 267 | static int pt_wait(struct pt_unit *tape, int go, int stop, char *fun, char *msg) |
| 268 | { |
| 269 | int j, r, e, s, p; |
| 270 | struct pi_adapter *pi = tape->pi; |
| 271 | |
| 272 | j = 0; |
| 273 | while ((((r = status_reg(pi)) & go) || (stop && (!(r & stop)))) |
| 274 | && (j++ < PT_SPIN)) |
| 275 | udelay(PT_SPIN_DEL); |
| 276 | |
| 277 | if ((r & (STAT_ERR & stop)) || (j >= PT_SPIN)) { |
| 278 | s = read_reg(pi, 7); |
| 279 | e = read_reg(pi, 1); |
| 280 | p = read_reg(pi, 2); |
| 281 | if (j >= PT_SPIN) |
| 282 | e |= 0x100; |
| 283 | if (fun) |
| 284 | printk("%s: %s %s: alt=0x%x stat=0x%x err=0x%x" |
| 285 | " loop=%d phase=%d\n", |
| 286 | tape->name, fun, msg, r, s, e, j, p); |
| 287 | return (e << 8) + s; |
| 288 | } |
| 289 | return 0; |
| 290 | } |
| 291 | |
| 292 | static int pt_command(struct pt_unit *tape, char *cmd, int dlen, char *fun) |
| 293 | { |
| 294 | struct pi_adapter *pi = tape->pi; |
| 295 | pi_connect(pi); |
| 296 | |
| 297 | write_reg(pi, 6, DRIVE(tape)); |
| 298 | |
| 299 | if (pt_wait(tape, STAT_BUSY | STAT_DRQ, 0, fun, "before command")) { |
| 300 | pi_disconnect(pi); |
| 301 | return -1; |
| 302 | } |
| 303 | |
| 304 | write_reg(pi, 4, dlen % 256); |
| 305 | write_reg(pi, 5, dlen / 256); |
| 306 | write_reg(pi, 7, 0xa0); /* ATAPI packet command */ |
| 307 | |
| 308 | if (pt_wait(tape, STAT_BUSY, STAT_DRQ, fun, "command DRQ")) { |
| 309 | pi_disconnect(pi); |
| 310 | return -1; |
| 311 | } |
| 312 | |
| 313 | if (read_reg(pi, 2) != 1) { |
| 314 | printk("%s: %s: command phase error\n", tape->name, fun); |
| 315 | pi_disconnect(pi); |
| 316 | return -1; |
| 317 | } |
| 318 | |
| 319 | pi_write_block(pi, cmd, 12); |
| 320 | |
| 321 | return 0; |
| 322 | } |
| 323 | |
| 324 | static int pt_completion(struct pt_unit *tape, char *buf, char *fun) |
| 325 | { |
| 326 | struct pi_adapter *pi = tape->pi; |
| 327 | int r, s, n, p; |
| 328 | |
| 329 | r = pt_wait(tape, STAT_BUSY, STAT_DRQ | STAT_READY | STAT_ERR, |
| 330 | fun, "completion"); |
| 331 | |
| 332 | if (read_reg(pi, 7) & STAT_DRQ) { |
| 333 | n = (((read_reg(pi, 4) + 256 * read_reg(pi, 5)) + |
| 334 | 3) & 0xfffc); |
| 335 | p = read_reg(pi, 2) & 3; |
| 336 | if (p == 0) |
| 337 | pi_write_block(pi, buf, n); |
| 338 | if (p == 2) |
| 339 | pi_read_block(pi, buf, n); |
| 340 | } |
| 341 | |
| 342 | s = pt_wait(tape, STAT_BUSY, STAT_READY | STAT_ERR, fun, "data done"); |
| 343 | |
| 344 | pi_disconnect(pi); |
| 345 | |
| 346 | return (r ? r : s); |
| 347 | } |
| 348 | |
| 349 | static void pt_req_sense(struct pt_unit *tape, int quiet) |
| 350 | { |
| 351 | char rs_cmd[12] = { ATAPI_REQ_SENSE, 0, 0, 0, 16, 0, 0, 0, 0, 0, 0, 0 }; |
| 352 | char buf[16]; |
| 353 | int r; |
| 354 | |
| 355 | r = pt_command(tape, rs_cmd, 16, "Request sense"); |
| 356 | mdelay(1); |
| 357 | if (!r) |
| 358 | pt_completion(tape, buf, "Request sense"); |
| 359 | |
| 360 | tape->last_sense = -1; |
| 361 | if (!r) { |
| 362 | if (!quiet) |
| 363 | printk("%s: Sense key: %x, ASC: %x, ASQ: %x\n", |
| 364 | tape->name, buf[2] & 0xf, buf[12], buf[13]); |
| 365 | tape->last_sense = (buf[2] & 0xf) | ((buf[12] & 0xff) << 8) |
| 366 | | ((buf[13] & 0xff) << 16); |
| 367 | } |
| 368 | } |
| 369 | |
| 370 | static int pt_atapi(struct pt_unit *tape, char *cmd, int dlen, char *buf, char *fun) |
| 371 | { |
| 372 | int r; |
| 373 | |
| 374 | r = pt_command(tape, cmd, dlen, fun); |
| 375 | mdelay(1); |
| 376 | if (!r) |
| 377 | r = pt_completion(tape, buf, fun); |
| 378 | if (r) |
| 379 | pt_req_sense(tape, !fun); |
| 380 | |
| 381 | return r; |
| 382 | } |
| 383 | |
| 384 | static void pt_sleep(int cs) |
| 385 | { |
Nishanth Aravamudan | 86e8486 | 2005-09-10 00:27:28 -0700 | [diff] [blame] | 386 | schedule_timeout_interruptible(cs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | } |
| 388 | |
| 389 | static int pt_poll_dsc(struct pt_unit *tape, int pause, int tmo, char *msg) |
| 390 | { |
| 391 | struct pi_adapter *pi = tape->pi; |
| 392 | int k, e, s; |
| 393 | |
| 394 | k = 0; |
| 395 | e = 0; |
| 396 | s = 0; |
| 397 | while (k < tmo) { |
| 398 | pt_sleep(pause); |
| 399 | k++; |
| 400 | pi_connect(pi); |
| 401 | write_reg(pi, 6, DRIVE(tape)); |
| 402 | s = read_reg(pi, 7); |
| 403 | e = read_reg(pi, 1); |
| 404 | pi_disconnect(pi); |
| 405 | if (s & (STAT_ERR | STAT_SEEK)) |
| 406 | break; |
| 407 | } |
| 408 | if ((k >= tmo) || (s & STAT_ERR)) { |
| 409 | if (k >= tmo) |
| 410 | printk("%s: %s DSC timeout\n", tape->name, msg); |
| 411 | else |
| 412 | printk("%s: %s stat=0x%x err=0x%x\n", tape->name, msg, s, |
| 413 | e); |
| 414 | pt_req_sense(tape, 0); |
| 415 | return 0; |
| 416 | } |
| 417 | return 1; |
| 418 | } |
| 419 | |
| 420 | static void pt_media_access_cmd(struct pt_unit *tape, int tmo, char *cmd, char *fun) |
| 421 | { |
| 422 | if (pt_command(tape, cmd, 0, fun)) { |
| 423 | pt_req_sense(tape, 0); |
| 424 | return; |
| 425 | } |
| 426 | pi_disconnect(tape->pi); |
| 427 | pt_poll_dsc(tape, HZ, tmo, fun); |
| 428 | } |
| 429 | |
| 430 | static void pt_rewind(struct pt_unit *tape) |
| 431 | { |
| 432 | char rw_cmd[12] = { ATAPI_REWIND, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; |
| 433 | |
| 434 | pt_media_access_cmd(tape, PT_REWIND_TMO, rw_cmd, "rewind"); |
| 435 | } |
| 436 | |
| 437 | static void pt_write_fm(struct pt_unit *tape) |
| 438 | { |
| 439 | char wm_cmd[12] = { ATAPI_WFM, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0 }; |
| 440 | |
| 441 | pt_media_access_cmd(tape, PT_TMO, wm_cmd, "write filemark"); |
| 442 | } |
| 443 | |
| 444 | #define DBMSG(msg) ((verbose>1)?(msg):NULL) |
| 445 | |
| 446 | static int pt_reset(struct pt_unit *tape) |
| 447 | { |
| 448 | struct pi_adapter *pi = tape->pi; |
| 449 | int i, k, flg; |
| 450 | int expect[5] = { 1, 1, 1, 0x14, 0xeb }; |
| 451 | |
| 452 | pi_connect(pi); |
| 453 | write_reg(pi, 6, DRIVE(tape)); |
| 454 | write_reg(pi, 7, 8); |
| 455 | |
| 456 | pt_sleep(20 * HZ / 1000); |
| 457 | |
| 458 | k = 0; |
| 459 | while ((k++ < PT_RESET_TMO) && (status_reg(pi) & STAT_BUSY)) |
| 460 | pt_sleep(HZ / 10); |
| 461 | |
| 462 | flg = 1; |
| 463 | for (i = 0; i < 5; i++) |
| 464 | flg &= (read_reg(pi, i + 1) == expect[i]); |
| 465 | |
| 466 | if (verbose) { |
| 467 | printk("%s: Reset (%d) signature = ", tape->name, k); |
| 468 | for (i = 0; i < 5; i++) |
| 469 | printk("%3x", read_reg(pi, i + 1)); |
| 470 | if (!flg) |
| 471 | printk(" (incorrect)"); |
| 472 | printk("\n"); |
| 473 | } |
| 474 | |
| 475 | pi_disconnect(pi); |
| 476 | return flg - 1; |
| 477 | } |
| 478 | |
| 479 | static int pt_ready_wait(struct pt_unit *tape, int tmo) |
| 480 | { |
| 481 | char tr_cmd[12] = { ATAPI_TEST_READY, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; |
| 482 | int k, p; |
| 483 | |
| 484 | k = 0; |
| 485 | while (k < tmo) { |
| 486 | tape->last_sense = 0; |
| 487 | pt_atapi(tape, tr_cmd, 0, NULL, DBMSG("test unit ready")); |
| 488 | p = tape->last_sense; |
| 489 | if (!p) |
| 490 | return 0; |
| 491 | if (!(((p & 0xffff) == 0x0402) || ((p & 0xff) == 6))) |
| 492 | return p; |
| 493 | k++; |
| 494 | pt_sleep(HZ); |
| 495 | } |
| 496 | return 0x000020; /* timeout */ |
| 497 | } |
| 498 | |
| 499 | static void xs(char *buf, char *targ, int offs, int len) |
| 500 | { |
| 501 | int j, k, l; |
| 502 | |
| 503 | j = 0; |
| 504 | l = 0; |
| 505 | for (k = 0; k < len; k++) |
| 506 | if ((buf[k + offs] != 0x20) || (buf[k + offs] != l)) |
| 507 | l = targ[j++] = buf[k + offs]; |
| 508 | if (l == 0x20) |
| 509 | j--; |
| 510 | targ[j] = 0; |
| 511 | } |
| 512 | |
| 513 | static int xn(char *buf, int offs, int size) |
| 514 | { |
| 515 | int v, k; |
| 516 | |
| 517 | v = 0; |
| 518 | for (k = 0; k < size; k++) |
| 519 | v = v * 256 + (buf[k + offs] & 0xff); |
| 520 | return v; |
| 521 | } |
| 522 | |
| 523 | static int pt_identify(struct pt_unit *tape) |
| 524 | { |
| 525 | int dt, s; |
| 526 | char *ms[2] = { "master", "slave" }; |
| 527 | char mf[10], id[18]; |
| 528 | char id_cmd[12] = { ATAPI_IDENTIFY, 0, 0, 0, 36, 0, 0, 0, 0, 0, 0, 0 }; |
| 529 | char ms_cmd[12] = |
| 530 | { ATAPI_MODE_SENSE, 0, 0x2a, 0, 36, 0, 0, 0, 0, 0, 0, 0 }; |
| 531 | char ls_cmd[12] = |
| 532 | { ATAPI_LOG_SENSE, 0, 0x71, 0, 0, 0, 0, 0, 36, 0, 0, 0 }; |
| 533 | char buf[36]; |
| 534 | |
| 535 | s = pt_atapi(tape, id_cmd, 36, buf, "identify"); |
| 536 | if (s) |
| 537 | return -1; |
| 538 | |
| 539 | dt = buf[0] & 0x1f; |
| 540 | if (dt != 1) { |
| 541 | if (verbose) |
| 542 | printk("%s: Drive %d, unsupported type %d\n", |
| 543 | tape->name, tape->drive, dt); |
| 544 | return -1; |
| 545 | } |
| 546 | |
| 547 | xs(buf, mf, 8, 8); |
| 548 | xs(buf, id, 16, 16); |
| 549 | |
| 550 | tape->flags = 0; |
| 551 | tape->capacity = 0; |
| 552 | tape->bs = 0; |
| 553 | |
| 554 | if (!pt_ready_wait(tape, PT_READY_TMO)) |
| 555 | tape->flags |= PT_MEDIA; |
| 556 | |
| 557 | if (!pt_atapi(tape, ms_cmd, 36, buf, "mode sense")) { |
| 558 | if (!(buf[2] & 0x80)) |
| 559 | tape->flags |= PT_WRITE_OK; |
| 560 | tape->bs = xn(buf, 10, 2); |
| 561 | } |
| 562 | |
| 563 | if (!pt_atapi(tape, ls_cmd, 36, buf, "log sense")) |
| 564 | tape->capacity = xn(buf, 24, 4); |
| 565 | |
| 566 | printk("%s: %s %s, %s", tape->name, mf, id, ms[tape->drive]); |
| 567 | if (!(tape->flags & PT_MEDIA)) |
| 568 | printk(", no media\n"); |
| 569 | else { |
| 570 | if (!(tape->flags & PT_WRITE_OK)) |
| 571 | printk(", RO"); |
| 572 | printk(", blocksize %d, %d MB\n", tape->bs, tape->capacity / 1024); |
| 573 | } |
| 574 | |
| 575 | return 0; |
| 576 | } |
| 577 | |
| 578 | |
| 579 | /* |
| 580 | * returns 0, with id set if drive is detected |
| 581 | * -1, if drive detection failed |
| 582 | */ |
| 583 | static int pt_probe(struct pt_unit *tape) |
| 584 | { |
| 585 | if (tape->drive == -1) { |
| 586 | for (tape->drive = 0; tape->drive <= 1; tape->drive++) |
| 587 | if (!pt_reset(tape)) |
| 588 | return pt_identify(tape); |
| 589 | } else { |
| 590 | if (!pt_reset(tape)) |
| 591 | return pt_identify(tape); |
| 592 | } |
| 593 | return -1; |
| 594 | } |
| 595 | |
| 596 | static int pt_detect(void) |
| 597 | { |
| 598 | struct pt_unit *tape; |
| 599 | int specified = 0, found = 0; |
| 600 | int unit; |
| 601 | |
| 602 | printk("%s: %s version %s, major %d\n", name, name, PT_VERSION, major); |
| 603 | |
| 604 | specified = 0; |
| 605 | for (unit = 0; unit < PT_UNITS; unit++) { |
| 606 | struct pt_unit *tape = &pt[unit]; |
| 607 | tape->pi = &tape->pia; |
| 608 | atomic_set(&tape->available, 1); |
| 609 | tape->flags = 0; |
| 610 | tape->last_sense = 0; |
| 611 | tape->present = 0; |
| 612 | tape->bufptr = NULL; |
| 613 | tape->drive = DU[D_SLV]; |
| 614 | snprintf(tape->name, PT_NAMELEN, "%s%d", name, unit); |
| 615 | if (!DU[D_PRT]) |
| 616 | continue; |
| 617 | specified++; |
| 618 | if (pi_init(tape->pi, 0, DU[D_PRT], DU[D_MOD], DU[D_UNI], |
| 619 | DU[D_PRO], DU[D_DLY], pt_scratch, PI_PT, |
| 620 | verbose, tape->name)) { |
| 621 | if (!pt_probe(tape)) { |
| 622 | tape->present = 1; |
| 623 | found++; |
| 624 | } else |
| 625 | pi_release(tape->pi); |
| 626 | } |
| 627 | } |
| 628 | if (specified == 0) { |
| 629 | tape = pt; |
| 630 | if (pi_init(tape->pi, 1, -1, -1, -1, -1, -1, pt_scratch, |
| 631 | PI_PT, verbose, tape->name)) { |
| 632 | if (!pt_probe(tape)) { |
| 633 | tape->present = 1; |
| 634 | found++; |
| 635 | } else |
| 636 | pi_release(tape->pi); |
| 637 | } |
| 638 | |
| 639 | } |
| 640 | if (found) |
| 641 | return 0; |
| 642 | |
| 643 | printk("%s: No ATAPI tape drive detected\n", name); |
| 644 | return -1; |
| 645 | } |
| 646 | |
| 647 | static int pt_open(struct inode *inode, struct file *file) |
| 648 | { |
| 649 | int unit = iminor(inode) & 0x7F; |
| 650 | struct pt_unit *tape = pt + unit; |
| 651 | int err; |
| 652 | |
Jonathan Corbet | ea2959a | 2008-05-15 10:07:56 -0600 | [diff] [blame] | 653 | lock_kernel(); |
| 654 | if (unit >= PT_UNITS || (!tape->present)) { |
| 655 | unlock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | return -ENODEV; |
Jonathan Corbet | ea2959a | 2008-05-15 10:07:56 -0600 | [diff] [blame] | 657 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | |
| 659 | err = -EBUSY; |
| 660 | if (!atomic_dec_and_test(&tape->available)) |
| 661 | goto out; |
| 662 | |
| 663 | pt_identify(tape); |
| 664 | |
| 665 | err = -ENODEV; |
Alexey Dobriyan | eaa0ff1 | 2008-02-06 01:36:06 -0800 | [diff] [blame] | 666 | if (!(tape->flags & PT_MEDIA)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | goto out; |
| 668 | |
| 669 | err = -EROFS; |
Al Viro | aeb5d72 | 2008-09-02 15:28:45 -0400 | [diff] [blame] | 670 | if ((!(tape->flags & PT_WRITE_OK)) && (file->f_mode & FMODE_WRITE)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | goto out; |
| 672 | |
| 673 | if (!(iminor(inode) & 128)) |
| 674 | tape->flags |= PT_REWIND; |
| 675 | |
| 676 | err = -ENOMEM; |
| 677 | tape->bufptr = kmalloc(PT_BUFSIZE, GFP_KERNEL); |
| 678 | if (tape->bufptr == NULL) { |
| 679 | printk("%s: buffer allocation failed\n", tape->name); |
| 680 | goto out; |
| 681 | } |
| 682 | |
| 683 | file->private_data = tape; |
Jonathan Corbet | ea2959a | 2008-05-15 10:07:56 -0600 | [diff] [blame] | 684 | unlock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | return 0; |
| 686 | |
| 687 | out: |
| 688 | atomic_inc(&tape->available); |
Jonathan Corbet | ea2959a | 2008-05-15 10:07:56 -0600 | [diff] [blame] | 689 | unlock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | return err; |
| 691 | } |
| 692 | |
Alan Cox | be1fd70 | 2008-07-04 09:51:21 +0200 | [diff] [blame] | 693 | static long pt_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 694 | { |
| 695 | struct pt_unit *tape = file->private_data; |
| 696 | struct mtop __user *p = (void __user *)arg; |
| 697 | struct mtop mtop; |
| 698 | |
| 699 | switch (cmd) { |
| 700 | case MTIOCTOP: |
| 701 | if (copy_from_user(&mtop, p, sizeof(struct mtop))) |
| 702 | return -EFAULT; |
| 703 | |
| 704 | switch (mtop.mt_op) { |
| 705 | |
| 706 | case MTREW: |
Alan Cox | be1fd70 | 2008-07-04 09:51:21 +0200 | [diff] [blame] | 707 | lock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | pt_rewind(tape); |
Alan Cox | be1fd70 | 2008-07-04 09:51:21 +0200 | [diff] [blame] | 709 | unlock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | return 0; |
| 711 | |
| 712 | case MTWEOF: |
Alan Cox | be1fd70 | 2008-07-04 09:51:21 +0200 | [diff] [blame] | 713 | lock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | pt_write_fm(tape); |
Alan Cox | be1fd70 | 2008-07-04 09:51:21 +0200 | [diff] [blame] | 715 | unlock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | return 0; |
| 717 | |
| 718 | default: |
Alan Cox | be1fd70 | 2008-07-04 09:51:21 +0200 | [diff] [blame] | 719 | /* FIXME: rate limit ?? */ |
| 720 | printk(KERN_DEBUG "%s: Unimplemented mt_op %d\n", tape->name, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | mtop.mt_op); |
| 722 | return -EINVAL; |
| 723 | } |
| 724 | |
| 725 | default: |
Alan Cox | be1fd70 | 2008-07-04 09:51:21 +0200 | [diff] [blame] | 726 | return -ENOTTY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | } |
| 728 | } |
| 729 | |
| 730 | static int |
| 731 | pt_release(struct inode *inode, struct file *file) |
| 732 | { |
| 733 | struct pt_unit *tape = file->private_data; |
| 734 | |
| 735 | if (atomic_read(&tape->available) > 1) |
| 736 | return -EINVAL; |
| 737 | |
| 738 | if (tape->flags & PT_WRITING) |
| 739 | pt_write_fm(tape); |
| 740 | |
| 741 | if (tape->flags & PT_REWIND) |
| 742 | pt_rewind(tape); |
| 743 | |
| 744 | kfree(tape->bufptr); |
| 745 | tape->bufptr = NULL; |
| 746 | |
| 747 | atomic_inc(&tape->available); |
| 748 | |
| 749 | return 0; |
| 750 | |
| 751 | } |
| 752 | |
| 753 | static ssize_t pt_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) |
| 754 | { |
| 755 | struct pt_unit *tape = filp->private_data; |
| 756 | struct pi_adapter *pi = tape->pi; |
| 757 | char rd_cmd[12] = { ATAPI_READ_6, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; |
| 758 | int k, n, r, p, s, t, b; |
| 759 | |
| 760 | if (!(tape->flags & (PT_READING | PT_WRITING))) { |
| 761 | tape->flags |= PT_READING; |
| 762 | if (pt_atapi(tape, rd_cmd, 0, NULL, "start read-ahead")) |
| 763 | return -EIO; |
| 764 | } else if (tape->flags & PT_WRITING) |
| 765 | return -EIO; |
| 766 | |
| 767 | if (tape->flags & PT_EOF) |
| 768 | return 0; |
| 769 | |
| 770 | t = 0; |
| 771 | |
| 772 | while (count > 0) { |
| 773 | |
| 774 | if (!pt_poll_dsc(tape, HZ / 100, PT_TMO, "read")) |
| 775 | return -EIO; |
| 776 | |
| 777 | n = count; |
| 778 | if (n > 32768) |
| 779 | n = 32768; /* max per command */ |
| 780 | b = (n - 1 + tape->bs) / tape->bs; |
| 781 | n = b * tape->bs; /* rounded up to even block */ |
| 782 | |
| 783 | rd_cmd[4] = b; |
| 784 | |
| 785 | r = pt_command(tape, rd_cmd, n, "read"); |
| 786 | |
| 787 | mdelay(1); |
| 788 | |
| 789 | if (r) { |
| 790 | pt_req_sense(tape, 0); |
| 791 | return -EIO; |
| 792 | } |
| 793 | |
| 794 | while (1) { |
| 795 | |
| 796 | r = pt_wait(tape, STAT_BUSY, |
| 797 | STAT_DRQ | STAT_ERR | STAT_READY, |
| 798 | DBMSG("read DRQ"), ""); |
| 799 | |
| 800 | if (r & STAT_SENSE) { |
| 801 | pi_disconnect(pi); |
| 802 | pt_req_sense(tape, 0); |
| 803 | return -EIO; |
| 804 | } |
| 805 | |
| 806 | if (r) |
| 807 | tape->flags |= PT_EOF; |
| 808 | |
| 809 | s = read_reg(pi, 7); |
| 810 | |
| 811 | if (!(s & STAT_DRQ)) |
| 812 | break; |
| 813 | |
| 814 | n = (read_reg(pi, 4) + 256 * read_reg(pi, 5)); |
| 815 | p = (read_reg(pi, 2) & 3); |
| 816 | if (p != 2) { |
| 817 | pi_disconnect(pi); |
| 818 | printk("%s: Phase error on read: %d\n", tape->name, |
| 819 | p); |
| 820 | return -EIO; |
| 821 | } |
| 822 | |
| 823 | while (n > 0) { |
| 824 | k = n; |
| 825 | if (k > PT_BUFSIZE) |
| 826 | k = PT_BUFSIZE; |
| 827 | pi_read_block(pi, tape->bufptr, k); |
| 828 | n -= k; |
| 829 | b = k; |
| 830 | if (b > count) |
| 831 | b = count; |
| 832 | if (copy_to_user(buf + t, tape->bufptr, b)) { |
| 833 | pi_disconnect(pi); |
| 834 | return -EFAULT; |
| 835 | } |
| 836 | t += b; |
| 837 | count -= b; |
| 838 | } |
| 839 | |
| 840 | } |
| 841 | pi_disconnect(pi); |
| 842 | if (tape->flags & PT_EOF) |
| 843 | break; |
| 844 | } |
| 845 | |
| 846 | return t; |
| 847 | |
| 848 | } |
| 849 | |
| 850 | static ssize_t pt_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) |
| 851 | { |
| 852 | struct pt_unit *tape = filp->private_data; |
| 853 | struct pi_adapter *pi = tape->pi; |
| 854 | char wr_cmd[12] = { ATAPI_WRITE_6, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; |
| 855 | int k, n, r, p, s, t, b; |
| 856 | |
| 857 | if (!(tape->flags & PT_WRITE_OK)) |
| 858 | return -EROFS; |
| 859 | |
| 860 | if (!(tape->flags & (PT_READING | PT_WRITING))) { |
| 861 | tape->flags |= PT_WRITING; |
| 862 | if (pt_atapi |
| 863 | (tape, wr_cmd, 0, NULL, "start buffer-available mode")) |
| 864 | return -EIO; |
| 865 | } else if (tape->flags & PT_READING) |
| 866 | return -EIO; |
| 867 | |
| 868 | if (tape->flags & PT_EOF) |
| 869 | return -ENOSPC; |
| 870 | |
| 871 | t = 0; |
| 872 | |
| 873 | while (count > 0) { |
| 874 | |
| 875 | if (!pt_poll_dsc(tape, HZ / 100, PT_TMO, "write")) |
| 876 | return -EIO; |
| 877 | |
| 878 | n = count; |
| 879 | if (n > 32768) |
| 880 | n = 32768; /* max per command */ |
| 881 | b = (n - 1 + tape->bs) / tape->bs; |
| 882 | n = b * tape->bs; /* rounded up to even block */ |
| 883 | |
| 884 | wr_cmd[4] = b; |
| 885 | |
| 886 | r = pt_command(tape, wr_cmd, n, "write"); |
| 887 | |
| 888 | mdelay(1); |
| 889 | |
| 890 | if (r) { /* error delivering command only */ |
| 891 | pt_req_sense(tape, 0); |
| 892 | return -EIO; |
| 893 | } |
| 894 | |
| 895 | while (1) { |
| 896 | |
| 897 | r = pt_wait(tape, STAT_BUSY, |
| 898 | STAT_DRQ | STAT_ERR | STAT_READY, |
| 899 | DBMSG("write DRQ"), NULL); |
| 900 | |
| 901 | if (r & STAT_SENSE) { |
| 902 | pi_disconnect(pi); |
| 903 | pt_req_sense(tape, 0); |
| 904 | return -EIO; |
| 905 | } |
| 906 | |
| 907 | if (r) |
| 908 | tape->flags |= PT_EOF; |
| 909 | |
| 910 | s = read_reg(pi, 7); |
| 911 | |
| 912 | if (!(s & STAT_DRQ)) |
| 913 | break; |
| 914 | |
| 915 | n = (read_reg(pi, 4) + 256 * read_reg(pi, 5)); |
| 916 | p = (read_reg(pi, 2) & 3); |
| 917 | if (p != 0) { |
| 918 | pi_disconnect(pi); |
| 919 | printk("%s: Phase error on write: %d \n", |
| 920 | tape->name, p); |
| 921 | return -EIO; |
| 922 | } |
| 923 | |
| 924 | while (n > 0) { |
| 925 | k = n; |
| 926 | if (k > PT_BUFSIZE) |
| 927 | k = PT_BUFSIZE; |
| 928 | b = k; |
| 929 | if (b > count) |
| 930 | b = count; |
| 931 | if (copy_from_user(tape->bufptr, buf + t, b)) { |
| 932 | pi_disconnect(pi); |
| 933 | return -EFAULT; |
| 934 | } |
| 935 | pi_write_block(pi, tape->bufptr, k); |
| 936 | t += b; |
| 937 | count -= b; |
| 938 | n -= k; |
| 939 | } |
| 940 | |
| 941 | } |
| 942 | pi_disconnect(pi); |
| 943 | if (tape->flags & PT_EOF) |
| 944 | break; |
| 945 | } |
| 946 | |
| 947 | return t; |
| 948 | } |
| 949 | |
| 950 | static int __init pt_init(void) |
| 951 | { |
Andrew Morton | 829d5f6 | 2006-03-28 01:56:18 -0800 | [diff] [blame] | 952 | int unit; |
| 953 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | |
| 955 | if (disable) { |
Akinobu Mita | 8bca98c | 2006-12-06 20:36:43 -0800 | [diff] [blame] | 956 | err = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | goto out; |
| 958 | } |
| 959 | |
| 960 | if (pt_detect()) { |
Akinobu Mita | 8bca98c | 2006-12-06 20:36:43 -0800 | [diff] [blame] | 961 | err = -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 962 | goto out; |
| 963 | } |
| 964 | |
Andrew Morton | 829d5f6 | 2006-03-28 01:56:18 -0800 | [diff] [blame] | 965 | err = register_chrdev(major, name, &pt_fops); |
| 966 | if (err < 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 967 | printk("pt_init: unable to get major number %d\n", major); |
| 968 | for (unit = 0; unit < PT_UNITS; unit++) |
| 969 | if (pt[unit].present) |
| 970 | pi_release(pt[unit].pi); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 971 | goto out; |
| 972 | } |
Andrew Morton | 829d5f6 | 2006-03-28 01:56:18 -0800 | [diff] [blame] | 973 | major = err; |
gregkh@suse.de | deb3697 | 2005-03-23 09:52:10 -0800 | [diff] [blame] | 974 | pt_class = class_create(THIS_MODULE, "pt"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 975 | if (IS_ERR(pt_class)) { |
| 976 | err = PTR_ERR(pt_class); |
| 977 | goto out_chrdev; |
| 978 | } |
| 979 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 980 | for (unit = 0; unit < PT_UNITS; unit++) |
| 981 | if (pt[unit].present) { |
Greg Kroah-Hartman | 1ff9f54 | 2008-07-21 20:03:34 -0700 | [diff] [blame] | 982 | device_create(pt_class, NULL, MKDEV(major, unit), NULL, |
| 983 | "pt%d", unit); |
| 984 | device_create(pt_class, NULL, MKDEV(major, unit + 128), |
| 985 | NULL, "pt%dn", unit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 986 | } |
| 987 | goto out; |
| 988 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 989 | out_chrdev: |
| 990 | unregister_chrdev(major, "pt"); |
| 991 | out: |
| 992 | return err; |
| 993 | } |
| 994 | |
| 995 | static void __exit pt_exit(void) |
| 996 | { |
| 997 | int unit; |
| 998 | for (unit = 0; unit < PT_UNITS; unit++) |
| 999 | if (pt[unit].present) { |
Tony Jones | aa27582 | 2007-09-25 02:03:03 +0200 | [diff] [blame] | 1000 | device_destroy(pt_class, MKDEV(major, unit)); |
| 1001 | device_destroy(pt_class, MKDEV(major, unit + 128)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1002 | } |
gregkh@suse.de | deb3697 | 2005-03-23 09:52:10 -0800 | [diff] [blame] | 1003 | class_destroy(pt_class); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | unregister_chrdev(major, name); |
| 1005 | for (unit = 0; unit < PT_UNITS; unit++) |
| 1006 | if (pt[unit].present) |
| 1007 | pi_release(pt[unit].pi); |
| 1008 | } |
| 1009 | |
| 1010 | MODULE_LICENSE("GPL"); |
| 1011 | module_init(pt_init) |
| 1012 | module_exit(pt_exit) |