Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/drivers/char/ppdev.c | |
3 | * | |
4 | * This is the code behind /dev/parport* -- it allows a user-space | |
5 | * application to use the parport subsystem. | |
6 | * | |
7 | * Copyright (C) 1998-2000, 2002 Tim Waugh <tim@cyberelk.net> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * as published by the Free Software Foundation; either version | |
12 | * 2 of the License, or (at your option) any later version. | |
13 | * | |
14 | * A /dev/parportx device node represents an arbitrary device | |
15 | * on port 'x'. The following operations are possible: | |
16 | * | |
17 | * open do nothing, set up default IEEE 1284 protocol to be COMPAT | |
18 | * close release port and unregister device (if necessary) | |
19 | * ioctl | |
20 | * EXCL register device exclusively (may fail) | |
21 | * CLAIM (register device first time) parport_claim_or_block | |
22 | * RELEASE parport_release | |
23 | * SETMODE set the IEEE 1284 protocol to use for read/write | |
24 | * SETPHASE set the IEEE 1284 phase of a particular mode. Not to be | |
25 | * confused with ioctl(fd, SETPHASER, &stun). ;-) | |
26 | * DATADIR data_forward / data_reverse | |
27 | * WDATA write_data | |
28 | * RDATA read_data | |
29 | * WCONTROL write_control | |
30 | * RCONTROL read_control | |
31 | * FCONTROL frob_control | |
32 | * RSTATUS read_status | |
33 | * NEGOT parport_negotiate | |
34 | * YIELD parport_yield_blocking | |
35 | * WCTLONIRQ on interrupt, set control lines | |
36 | * CLRIRQ clear (and return) interrupt count | |
37 | * SETTIME sets device timeout (struct timeval) | |
38 | * GETTIME gets device timeout (struct timeval) | |
39 | * GETMODES gets hardware supported modes (unsigned int) | |
40 | * GETMODE gets the current IEEE1284 mode | |
41 | * GETPHASE gets the current IEEE1284 phase | |
42 | * GETFLAGS gets current (user-visible) flags | |
43 | * SETFLAGS sets current (user-visible) flags | |
44 | * read/write read or write in current IEEE 1284 protocol | |
45 | * select wait for interrupt (in readfds) | |
46 | * | |
47 | * Changes: | |
48 | * Added SETTIME/GETTIME ioctl, Fred Barnes, 1999. | |
49 | * | |
50 | * Arnaldo Carvalho de Melo <acme@conectiva.com.br> 2000/08/25 | |
51 | * - On error, copy_from_user and copy_to_user do not return -EFAULT, | |
52 | * They return the positive number of bytes *not* copied due to address | |
53 | * space errors. | |
54 | * | |
55 | * Added GETMODES/GETMODE/GETPHASE ioctls, Fred Barnes <frmb2@ukc.ac.uk>, 03/01/2001. | |
56 | * Added GETFLAGS/SETFLAGS ioctls, Fred Barnes, 04/2001 | |
57 | */ | |
58 | ||
59 | #include <linux/module.h> | |
60 | #include <linux/init.h> | |
61 | #include <linux/sched.h> | |
62 | #include <linux/device.h> | |
1da177e4 LT |
63 | #include <linux/ioctl.h> |
64 | #include <linux/parport.h> | |
65 | #include <linux/ctype.h> | |
66 | #include <linux/poll.h> | |
5a0e3ad6 | 67 | #include <linux/slab.h> |
e6a67846 | 68 | #include <linux/major.h> |
1da177e4 | 69 | #include <linux/ppdev.h> |
613655fa | 70 | #include <linux/mutex.h> |
6d535d3e | 71 | #include <linux/uaccess.h> |
17a3596f | 72 | #include <linux/compat.h> |
1da177e4 LT |
73 | |
74 | #define PP_VERSION "ppdev: user-space parallel port driver" | |
75 | #define CHRDEV "ppdev" | |
76 | ||
77 | struct pp_struct { | |
d85c1a2d | 78 | struct pardevice *pdev; |
1da177e4 LT |
79 | wait_queue_head_t irq_wait; |
80 | atomic_t irqc; | |
81 | unsigned int flags; | |
82 | int irqresponse; | |
83 | unsigned char irqctl; | |
84 | struct ieee1284_info state; | |
85 | struct ieee1284_info saved_state; | |
86 | long default_inactivity; | |
87 | }; | |
88 | ||
89 | /* pp_struct.flags bitfields */ | |
90 | #define PP_CLAIMED (1<<0) | |
91 | #define PP_EXCL (1<<1) | |
92 | ||
93 | /* Other constants */ | |
94 | #define PP_INTERRUPT_TIMEOUT (10 * HZ) /* 10s */ | |
95 | #define PP_BUFFER_SIZE 1024 | |
96 | #define PARDEVICE_MAX 8 | |
97 | ||
98 | /* ROUND_UP macro from fs/select.c */ | |
99 | #define ROUND_UP(x,y) (((x)+(y)-1)/(y)) | |
100 | ||
613655fa | 101 | static DEFINE_MUTEX(pp_do_mutex); |
3b9ab374 BJZ |
102 | |
103 | /* define fixed sized ioctl cmd for y2038 migration */ | |
104 | #define PPGETTIME32 _IOR(PP_IOCTL, 0x95, s32[2]) | |
105 | #define PPSETTIME32 _IOW(PP_IOCTL, 0x96, s32[2]) | |
106 | #define PPGETTIME64 _IOR(PP_IOCTL, 0x95, s64[2]) | |
107 | #define PPSETTIME64 _IOW(PP_IOCTL, 0x96, s64[2]) | |
108 | ||
783ea44d | 109 | static inline void pp_enable_irq(struct pp_struct *pp) |
1da177e4 LT |
110 | { |
111 | struct parport *port = pp->pdev->port; | |
27f3b8a3 | 112 | |
783ea44d | 113 | port->ops->enable_irq(port); |
1da177e4 LT |
114 | } |
115 | ||
d85c1a2d | 116 | static ssize_t pp_read(struct file *file, char __user *buf, size_t count, |
a7c71c07 | 117 | loff_t *ppos) |
1da177e4 | 118 | { |
496ad9aa | 119 | unsigned int minor = iminor(file_inode(file)); |
1da177e4 | 120 | struct pp_struct *pp = file->private_data; |
d85c1a2d | 121 | char *kbuffer; |
1da177e4 LT |
122 | ssize_t bytes_read = 0; |
123 | struct parport *pport; | |
124 | int mode; | |
125 | ||
126 | if (!(pp->flags & PP_CLAIMED)) { | |
127 | /* Don't have the port claimed */ | |
81fc401e | 128 | pr_debug(CHRDEV "%x: claim the port first\n", minor); |
1da177e4 LT |
129 | return -EINVAL; |
130 | } | |
131 | ||
132 | /* Trivial case. */ | |
133 | if (count == 0) | |
134 | return 0; | |
135 | ||
136 | kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL); | |
83e80605 | 137 | if (!kbuffer) |
1da177e4 | 138 | return -ENOMEM; |
1da177e4 LT |
139 | pport = pp->pdev->port; |
140 | mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR); | |
141 | ||
783ea44d | 142 | parport_set_timeout(pp->pdev, |
a7c71c07 SM |
143 | (file->f_flags & O_NONBLOCK) ? |
144 | PARPORT_INACTIVITY_O_NONBLOCK : | |
145 | pp->default_inactivity); | |
1da177e4 LT |
146 | |
147 | while (bytes_read == 0) { | |
148 | ssize_t need = min_t(unsigned long, count, PP_BUFFER_SIZE); | |
149 | ||
150 | if (mode == IEEE1284_MODE_EPP) { | |
151 | /* various specials for EPP mode */ | |
152 | int flags = 0; | |
153 | size_t (*fn)(struct parport *, void *, size_t, int); | |
154 | ||
83e80605 | 155 | if (pp->flags & PP_W91284PIC) |
1da177e4 | 156 | flags |= PARPORT_W91284PIC; |
83e80605 | 157 | if (pp->flags & PP_FASTREAD) |
1da177e4 | 158 | flags |= PARPORT_EPP_FAST; |
83e80605 | 159 | if (pport->ieee1284.mode & IEEE1284_ADDR) |
1da177e4 | 160 | fn = pport->ops->epp_read_addr; |
83e80605 | 161 | else |
1da177e4 | 162 | fn = pport->ops->epp_read_data; |
1da177e4 LT |
163 | bytes_read = (*fn)(pport, kbuffer, need, flags); |
164 | } else { | |
783ea44d | 165 | bytes_read = parport_read(pport, kbuffer, need); |
1da177e4 LT |
166 | } |
167 | ||
168 | if (bytes_read != 0) | |
169 | break; | |
170 | ||
171 | if (file->f_flags & O_NONBLOCK) { | |
172 | bytes_read = -EAGAIN; | |
173 | break; | |
174 | } | |
175 | ||
783ea44d | 176 | if (signal_pending(current)) { |
1da177e4 LT |
177 | bytes_read = -ERESTARTSYS; |
178 | break; | |
179 | } | |
180 | ||
181 | cond_resched(); | |
182 | } | |
183 | ||
783ea44d | 184 | parport_set_timeout(pp->pdev, pp->default_inactivity); |
1da177e4 | 185 | |
783ea44d | 186 | if (bytes_read > 0 && copy_to_user(buf, kbuffer, bytes_read)) |
1da177e4 LT |
187 | bytes_read = -EFAULT; |
188 | ||
783ea44d SM |
189 | kfree(kbuffer); |
190 | pp_enable_irq(pp); | |
1da177e4 LT |
191 | return bytes_read; |
192 | } | |
193 | ||
d85c1a2d | 194 | static ssize_t pp_write(struct file *file, const char __user *buf, |
a7c71c07 | 195 | size_t count, loff_t *ppos) |
1da177e4 | 196 | { |
496ad9aa | 197 | unsigned int minor = iminor(file_inode(file)); |
1da177e4 | 198 | struct pp_struct *pp = file->private_data; |
d85c1a2d | 199 | char *kbuffer; |
1da177e4 LT |
200 | ssize_t bytes_written = 0; |
201 | ssize_t wrote; | |
202 | int mode; | |
203 | struct parport *pport; | |
204 | ||
205 | if (!(pp->flags & PP_CLAIMED)) { | |
206 | /* Don't have the port claimed */ | |
81fc401e | 207 | pr_debug(CHRDEV "%x: claim the port first\n", minor); |
1da177e4 LT |
208 | return -EINVAL; |
209 | } | |
210 | ||
211 | kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL); | |
83e80605 | 212 | if (!kbuffer) |
1da177e4 | 213 | return -ENOMEM; |
83e80605 | 214 | |
1da177e4 LT |
215 | pport = pp->pdev->port; |
216 | mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR); | |
217 | ||
783ea44d | 218 | parport_set_timeout(pp->pdev, |
a7c71c07 SM |
219 | (file->f_flags & O_NONBLOCK) ? |
220 | PARPORT_INACTIVITY_O_NONBLOCK : | |
221 | pp->default_inactivity); | |
1da177e4 LT |
222 | |
223 | while (bytes_written < count) { | |
224 | ssize_t n = min_t(unsigned long, count - bytes_written, PP_BUFFER_SIZE); | |
225 | ||
783ea44d | 226 | if (copy_from_user(kbuffer, buf + bytes_written, n)) { |
1da177e4 LT |
227 | bytes_written = -EFAULT; |
228 | break; | |
229 | } | |
230 | ||
231 | if ((pp->flags & PP_FASTWRITE) && (mode == IEEE1284_MODE_EPP)) { | |
232 | /* do a fast EPP write */ | |
233 | if (pport->ieee1284.mode & IEEE1284_ADDR) { | |
783ea44d | 234 | wrote = pport->ops->epp_write_addr(pport, |
1da177e4 LT |
235 | kbuffer, n, PARPORT_EPP_FAST); |
236 | } else { | |
783ea44d | 237 | wrote = pport->ops->epp_write_data(pport, |
1da177e4 LT |
238 | kbuffer, n, PARPORT_EPP_FAST); |
239 | } | |
240 | } else { | |
783ea44d | 241 | wrote = parport_write(pp->pdev->port, kbuffer, n); |
1da177e4 LT |
242 | } |
243 | ||
244 | if (wrote <= 0) { | |
83e80605 | 245 | if (!bytes_written) |
1da177e4 | 246 | bytes_written = wrote; |
1da177e4 LT |
247 | break; |
248 | } | |
249 | ||
250 | bytes_written += wrote; | |
251 | ||
252 | if (file->f_flags & O_NONBLOCK) { | |
253 | if (!bytes_written) | |
254 | bytes_written = -EAGAIN; | |
255 | break; | |
256 | } | |
257 | ||
783ea44d | 258 | if (signal_pending(current)) |
1da177e4 | 259 | break; |
1da177e4 LT |
260 | |
261 | cond_resched(); | |
262 | } | |
263 | ||
783ea44d | 264 | parport_set_timeout(pp->pdev, pp->default_inactivity); |
1da177e4 | 265 | |
783ea44d SM |
266 | kfree(kbuffer); |
267 | pp_enable_irq(pp); | |
1da177e4 LT |
268 | return bytes_written; |
269 | } | |
270 | ||
783ea44d | 271 | static void pp_irq(void *private) |
1da177e4 | 272 | { |
5712cb3d | 273 | struct pp_struct *pp = private; |
1da177e4 LT |
274 | |
275 | if (pp->irqresponse) { | |
783ea44d | 276 | parport_write_control(pp->pdev->port, pp->irqctl); |
1da177e4 LT |
277 | pp->irqresponse = 0; |
278 | } | |
279 | ||
783ea44d SM |
280 | atomic_inc(&pp->irqc); |
281 | wake_up_interruptible(&pp->irq_wait); | |
1da177e4 LT |
282 | } |
283 | ||
783ea44d | 284 | static int register_device(int minor, struct pp_struct *pp) |
1da177e4 LT |
285 | { |
286 | struct parport *port; | |
d85c1a2d | 287 | struct pardevice *pdev = NULL; |
1da177e4 | 288 | char *name; |
1701f680 | 289 | int fl; |
1da177e4 | 290 | |
87575437 | 291 | name = kasprintf(GFP_KERNEL, CHRDEV "%x", minor); |
1da177e4 LT |
292 | if (name == NULL) |
293 | return -ENOMEM; | |
294 | ||
783ea44d | 295 | port = parport_find_number(minor); |
1da177e4 | 296 | if (!port) { |
783ea44d SM |
297 | printk(KERN_WARNING "%s: no associated port!\n", name); |
298 | kfree(name); | |
1da177e4 LT |
299 | return -ENXIO; |
300 | } | |
301 | ||
1701f680 LT |
302 | fl = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0; |
303 | pdev = parport_register_device(port, name, NULL, | |
304 | NULL, pp_irq, fl, pp); | |
783ea44d | 305 | parport_put_port(port); |
1da177e4 LT |
306 | |
307 | if (!pdev) { | |
783ea44d SM |
308 | printk(KERN_WARNING "%s: failed to register device!\n", name); |
309 | kfree(name); | |
1da177e4 LT |
310 | return -ENXIO; |
311 | } | |
312 | ||
313 | pp->pdev = pdev; | |
396ec3de | 314 | dev_dbg(&pdev->dev, "registered pardevice\n"); |
1da177e4 LT |
315 | return 0; |
316 | } | |
317 | ||
783ea44d | 318 | static enum ieee1284_phase init_phase(int mode) |
1da177e4 LT |
319 | { |
320 | switch (mode & ~(IEEE1284_DEVICEID | |
321 | | IEEE1284_ADDR)) { | |
322 | case IEEE1284_MODE_NIBBLE: | |
323 | case IEEE1284_MODE_BYTE: | |
324 | return IEEE1284_PH_REV_IDLE; | |
325 | } | |
326 | return IEEE1284_PH_FWD_IDLE; | |
327 | } | |
328 | ||
3b9ab374 BJZ |
329 | static int pp_set_timeout(struct pardevice *pdev, long tv_sec, int tv_usec) |
330 | { | |
331 | long to_jiffies; | |
332 | ||
333 | if ((tv_sec < 0) || (tv_usec < 0)) | |
334 | return -EINVAL; | |
335 | ||
336 | to_jiffies = usecs_to_jiffies(tv_usec); | |
337 | to_jiffies += tv_sec * HZ; | |
338 | if (to_jiffies <= 0) | |
339 | return -EINVAL; | |
340 | ||
341 | pdev->timeout = to_jiffies; | |
342 | return 0; | |
343 | } | |
344 | ||
6d535d3e | 345 | static int pp_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1da177e4 | 346 | { |
496ad9aa | 347 | unsigned int minor = iminor(file_inode(file)); |
1da177e4 | 348 | struct pp_struct *pp = file->private_data; |
d85c1a2d | 349 | struct parport *port; |
1da177e4 LT |
350 | void __user *argp = (void __user *)arg; |
351 | ||
352 | /* First handle the cases that don't take arguments. */ | |
353 | switch (cmd) { | |
354 | case PPCLAIM: | |
355 | { | |
356 | struct ieee1284_info *info; | |
357 | int ret; | |
358 | ||
359 | if (pp->flags & PP_CLAIMED) { | |
396ec3de | 360 | dev_dbg(&pp->pdev->dev, "you've already got it!\n"); |
1da177e4 LT |
361 | return -EINVAL; |
362 | } | |
363 | ||
364 | /* Deferred device registration. */ | |
365 | if (!pp->pdev) { | |
783ea44d | 366 | int err = register_device(minor, pp); |
27f3b8a3 | 367 | |
83e80605 | 368 | if (err) |
1da177e4 | 369 | return err; |
1da177e4 LT |
370 | } |
371 | ||
783ea44d | 372 | ret = parport_claim_or_block(pp->pdev); |
1da177e4 LT |
373 | if (ret < 0) |
374 | return ret; | |
375 | ||
376 | pp->flags |= PP_CLAIMED; | |
377 | ||
378 | /* For interrupt-reporting to work, we need to be | |
379 | * informed of each interrupt. */ | |
783ea44d | 380 | pp_enable_irq(pp); |
1da177e4 LT |
381 | |
382 | /* We may need to fix up the state machine. */ | |
383 | info = &pp->pdev->port->ieee1284; | |
384 | pp->saved_state.mode = info->mode; | |
385 | pp->saved_state.phase = info->phase; | |
386 | info->mode = pp->state.mode; | |
387 | info->phase = pp->state.phase; | |
783ea44d SM |
388 | pp->default_inactivity = parport_set_timeout(pp->pdev, 0); |
389 | parport_set_timeout(pp->pdev, pp->default_inactivity); | |
1da177e4 LT |
390 | |
391 | return 0; | |
392 | } | |
393 | case PPEXCL: | |
394 | if (pp->pdev) { | |
396ec3de SM |
395 | dev_dbg(&pp->pdev->dev, |
396 | "too late for PPEXCL; already registered\n"); | |
1da177e4 LT |
397 | if (pp->flags & PP_EXCL) |
398 | /* But it's not really an error. */ | |
399 | return 0; | |
400 | /* There's no chance of making the driver happy. */ | |
401 | return -EINVAL; | |
402 | } | |
403 | ||
404 | /* Just remember to register the device exclusively | |
405 | * when we finally do the registration. */ | |
406 | pp->flags |= PP_EXCL; | |
407 | return 0; | |
408 | case PPSETMODE: | |
409 | { | |
410 | int mode; | |
27f3b8a3 | 411 | |
783ea44d | 412 | if (copy_from_user(&mode, argp, sizeof(mode))) |
1da177e4 LT |
413 | return -EFAULT; |
414 | /* FIXME: validate mode */ | |
415 | pp->state.mode = mode; | |
783ea44d | 416 | pp->state.phase = init_phase(mode); |
1da177e4 LT |
417 | |
418 | if (pp->flags & PP_CLAIMED) { | |
419 | pp->pdev->port->ieee1284.mode = mode; | |
420 | pp->pdev->port->ieee1284.phase = pp->state.phase; | |
421 | } | |
422 | ||
423 | return 0; | |
424 | } | |
425 | case PPGETMODE: | |
426 | { | |
427 | int mode; | |
428 | ||
83e80605 | 429 | if (pp->flags & PP_CLAIMED) |
1da177e4 | 430 | mode = pp->pdev->port->ieee1284.mode; |
83e80605 | 431 | else |
1da177e4 | 432 | mode = pp->state.mode; |
83e80605 SM |
433 | |
434 | if (copy_to_user(argp, &mode, sizeof(mode))) | |
1da177e4 | 435 | return -EFAULT; |
1da177e4 LT |
436 | return 0; |
437 | } | |
438 | case PPSETPHASE: | |
439 | { | |
440 | int phase; | |
27f3b8a3 | 441 | |
83e80605 | 442 | if (copy_from_user(&phase, argp, sizeof(phase))) |
1da177e4 | 443 | return -EFAULT; |
83e80605 | 444 | |
1da177e4 LT |
445 | /* FIXME: validate phase */ |
446 | pp->state.phase = phase; | |
447 | ||
83e80605 | 448 | if (pp->flags & PP_CLAIMED) |
1da177e4 | 449 | pp->pdev->port->ieee1284.phase = phase; |
1da177e4 LT |
450 | |
451 | return 0; | |
452 | } | |
453 | case PPGETPHASE: | |
454 | { | |
455 | int phase; | |
456 | ||
83e80605 | 457 | if (pp->flags & PP_CLAIMED) |
1da177e4 | 458 | phase = pp->pdev->port->ieee1284.phase; |
83e80605 | 459 | else |
1da177e4 | 460 | phase = pp->state.phase; |
83e80605 | 461 | if (copy_to_user(argp, &phase, sizeof(phase))) |
1da177e4 | 462 | return -EFAULT; |
1da177e4 LT |
463 | return 0; |
464 | } | |
465 | case PPGETMODES: | |
466 | { | |
467 | unsigned int modes; | |
468 | ||
783ea44d | 469 | port = parport_find_number(minor); |
1da177e4 LT |
470 | if (!port) |
471 | return -ENODEV; | |
472 | ||
473 | modes = port->modes; | |
d98808a2 | 474 | parport_put_port(port); |
83e80605 | 475 | if (copy_to_user(argp, &modes, sizeof(modes))) |
1da177e4 | 476 | return -EFAULT; |
1da177e4 LT |
477 | return 0; |
478 | } | |
479 | case PPSETFLAGS: | |
480 | { | |
481 | int uflags; | |
482 | ||
83e80605 | 483 | if (copy_from_user(&uflags, argp, sizeof(uflags))) |
1da177e4 | 484 | return -EFAULT; |
1da177e4 LT |
485 | pp->flags &= ~PP_FLAGMASK; |
486 | pp->flags |= (uflags & PP_FLAGMASK); | |
487 | return 0; | |
488 | } | |
489 | case PPGETFLAGS: | |
490 | { | |
491 | int uflags; | |
492 | ||
493 | uflags = pp->flags & PP_FLAGMASK; | |
83e80605 | 494 | if (copy_to_user(argp, &uflags, sizeof(uflags))) |
1da177e4 | 495 | return -EFAULT; |
1da177e4 LT |
496 | return 0; |
497 | } | |
498 | } /* end switch() */ | |
499 | ||
500 | /* Everything else requires the port to be claimed, so check | |
501 | * that now. */ | |
502 | if ((pp->flags & PP_CLAIMED) == 0) { | |
81fc401e | 503 | pr_debug(CHRDEV "%x: claim the port first\n", minor); |
1da177e4 LT |
504 | return -EINVAL; |
505 | } | |
506 | ||
507 | port = pp->pdev->port; | |
508 | switch (cmd) { | |
509 | struct ieee1284_info *info; | |
510 | unsigned char reg; | |
511 | unsigned char mask; | |
512 | int mode; | |
3b9ab374 BJZ |
513 | s32 time32[2]; |
514 | s64 time64[2]; | |
515 | struct timespec64 ts; | |
1da177e4 | 516 | int ret; |
1da177e4 LT |
517 | |
518 | case PPRSTATUS: | |
783ea44d SM |
519 | reg = parport_read_status(port); |
520 | if (copy_to_user(argp, ®, sizeof(reg))) | |
1da177e4 LT |
521 | return -EFAULT; |
522 | return 0; | |
523 | case PPRDATA: | |
783ea44d SM |
524 | reg = parport_read_data(port); |
525 | if (copy_to_user(argp, ®, sizeof(reg))) | |
1da177e4 LT |
526 | return -EFAULT; |
527 | return 0; | |
528 | case PPRCONTROL: | |
783ea44d SM |
529 | reg = parport_read_control(port); |
530 | if (copy_to_user(argp, ®, sizeof(reg))) | |
1da177e4 LT |
531 | return -EFAULT; |
532 | return 0; | |
533 | case PPYIELD: | |
783ea44d | 534 | parport_yield_blocking(pp->pdev); |
1da177e4 LT |
535 | return 0; |
536 | ||
537 | case PPRELEASE: | |
538 | /* Save the state machine's state. */ | |
539 | info = &pp->pdev->port->ieee1284; | |
540 | pp->state.mode = info->mode; | |
541 | pp->state.phase = info->phase; | |
542 | info->mode = pp->saved_state.mode; | |
543 | info->phase = pp->saved_state.phase; | |
783ea44d | 544 | parport_release(pp->pdev); |
1da177e4 LT |
545 | pp->flags &= ~PP_CLAIMED; |
546 | return 0; | |
547 | ||
548 | case PPWCONTROL: | |
783ea44d | 549 | if (copy_from_user(®, argp, sizeof(reg))) |
1da177e4 | 550 | return -EFAULT; |
783ea44d | 551 | parport_write_control(port, reg); |
1da177e4 LT |
552 | return 0; |
553 | ||
554 | case PPWDATA: | |
783ea44d | 555 | if (copy_from_user(®, argp, sizeof(reg))) |
1da177e4 | 556 | return -EFAULT; |
783ea44d | 557 | parport_write_data(port, reg); |
1da177e4 LT |
558 | return 0; |
559 | ||
560 | case PPFCONTROL: | |
783ea44d | 561 | if (copy_from_user(&mask, argp, |
a7c71c07 | 562 | sizeof(mask))) |
1da177e4 | 563 | return -EFAULT; |
783ea44d | 564 | if (copy_from_user(®, 1 + (unsigned char __user *) arg, |
a7c71c07 | 565 | sizeof(reg))) |
1da177e4 | 566 | return -EFAULT; |
783ea44d | 567 | parport_frob_control(port, mask, reg); |
1da177e4 LT |
568 | return 0; |
569 | ||
570 | case PPDATADIR: | |
783ea44d | 571 | if (copy_from_user(&mode, argp, sizeof(mode))) |
1da177e4 LT |
572 | return -EFAULT; |
573 | if (mode) | |
783ea44d | 574 | port->ops->data_reverse(port); |
1da177e4 | 575 | else |
783ea44d | 576 | port->ops->data_forward(port); |
1da177e4 LT |
577 | return 0; |
578 | ||
579 | case PPNEGOT: | |
783ea44d | 580 | if (copy_from_user(&mode, argp, sizeof(mode))) |
1da177e4 | 581 | return -EFAULT; |
783ea44d | 582 | switch ((ret = parport_negotiate(port, mode))) { |
1da177e4 LT |
583 | case 0: break; |
584 | case -1: /* handshake failed, peripheral not IEEE 1284 */ | |
585 | ret = -EIO; | |
586 | break; | |
587 | case 1: /* handshake succeeded, peripheral rejected mode */ | |
588 | ret = -ENXIO; | |
589 | break; | |
590 | } | |
783ea44d | 591 | pp_enable_irq(pp); |
1da177e4 LT |
592 | return ret; |
593 | ||
594 | case PPWCTLONIRQ: | |
783ea44d | 595 | if (copy_from_user(®, argp, sizeof(reg))) |
1da177e4 LT |
596 | return -EFAULT; |
597 | ||
598 | /* Remember what to set the control lines to, for next | |
599 | * time we get an interrupt. */ | |
600 | pp->irqctl = reg; | |
601 | pp->irqresponse = 1; | |
602 | return 0; | |
603 | ||
604 | case PPCLRIRQ: | |
783ea44d SM |
605 | ret = atomic_read(&pp->irqc); |
606 | if (copy_to_user(argp, &ret, sizeof(ret))) | |
1da177e4 | 607 | return -EFAULT; |
783ea44d | 608 | atomic_sub(ret, &pp->irqc); |
1da177e4 LT |
609 | return 0; |
610 | ||
3b9ab374 BJZ |
611 | case PPSETTIME32: |
612 | if (copy_from_user(time32, argp, sizeof(time32))) | |
1da177e4 | 613 | return -EFAULT; |
3b9ab374 BJZ |
614 | |
615 | return pp_set_timeout(pp->pdev, time32[0], time32[1]); | |
616 | ||
617 | case PPSETTIME64: | |
618 | if (copy_from_user(time64, argp, sizeof(time64))) | |
619 | return -EFAULT; | |
620 | ||
621 | return pp_set_timeout(pp->pdev, time64[0], time64[1]); | |
622 | ||
623 | case PPGETTIME32: | |
624 | jiffies_to_timespec64(pp->pdev->timeout, &ts); | |
625 | time32[0] = ts.tv_sec; | |
626 | time32[1] = ts.tv_nsec / NSEC_PER_USEC; | |
627 | if ((time32[0] < 0) || (time32[1] < 0)) | |
1da177e4 | 628 | return -EINVAL; |
3b9ab374 BJZ |
629 | |
630 | if (copy_to_user(argp, time32, sizeof(time32))) | |
631 | return -EFAULT; | |
632 | ||
1da177e4 LT |
633 | return 0; |
634 | ||
3b9ab374 BJZ |
635 | case PPGETTIME64: |
636 | jiffies_to_timespec64(pp->pdev->timeout, &ts); | |
637 | time64[0] = ts.tv_sec; | |
638 | time64[1] = ts.tv_nsec / NSEC_PER_USEC; | |
639 | if ((time64[0] < 0) || (time64[1] < 0)) | |
640 | return -EINVAL; | |
641 | ||
642 | if (copy_to_user(argp, time64, sizeof(time64))) | |
1da177e4 | 643 | return -EFAULT; |
3b9ab374 | 644 | |
1da177e4 LT |
645 | return 0; |
646 | ||
647 | default: | |
396ec3de | 648 | dev_dbg(&pp->pdev->dev, "What? (cmd=0x%x)\n", cmd); |
1da177e4 LT |
649 | return -EINVAL; |
650 | } | |
651 | ||
652 | /* Keep the compiler happy */ | |
653 | return 0; | |
654 | } | |
655 | ||
6d535d3e AC |
656 | static long pp_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
657 | { | |
658 | long ret; | |
27f3b8a3 | 659 | |
613655fa | 660 | mutex_lock(&pp_do_mutex); |
6d535d3e | 661 | ret = pp_do_ioctl(file, cmd, arg); |
613655fa | 662 | mutex_unlock(&pp_do_mutex); |
6d535d3e AC |
663 | return ret; |
664 | } | |
665 | ||
17a3596f BJZ |
666 | #ifdef CONFIG_COMPAT |
667 | static long pp_compat_ioctl(struct file *file, unsigned int cmd, | |
a7c71c07 | 668 | unsigned long arg) |
17a3596f BJZ |
669 | { |
670 | return pp_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); | |
671 | } | |
672 | #endif | |
673 | ||
d85c1a2d | 674 | static int pp_open(struct inode *inode, struct file *file) |
1da177e4 LT |
675 | { |
676 | unsigned int minor = iminor(inode); | |
677 | struct pp_struct *pp; | |
678 | ||
679 | if (minor >= PARPORT_MAX) | |
680 | return -ENXIO; | |
681 | ||
783ea44d | 682 | pp = kmalloc(sizeof(struct pp_struct), GFP_KERNEL); |
1da177e4 LT |
683 | if (!pp) |
684 | return -ENOMEM; | |
685 | ||
686 | pp->state.mode = IEEE1284_MODE_COMPAT; | |
783ea44d | 687 | pp->state.phase = init_phase(pp->state.mode); |
1da177e4 LT |
688 | pp->flags = 0; |
689 | pp->irqresponse = 0; | |
783ea44d SM |
690 | atomic_set(&pp->irqc, 0); |
691 | init_waitqueue_head(&pp->irq_wait); | |
1da177e4 LT |
692 | |
693 | /* Defer the actual device registration until the first claim. | |
694 | * That way, we know whether or not the driver wants to have | |
695 | * exclusive access to the port (PPEXCL). | |
696 | */ | |
697 | pp->pdev = NULL; | |
698 | file->private_data = pp; | |
699 | ||
700 | return 0; | |
701 | } | |
702 | ||
d85c1a2d | 703 | static int pp_release(struct inode *inode, struct file *file) |
1da177e4 LT |
704 | { |
705 | unsigned int minor = iminor(inode); | |
706 | struct pp_struct *pp = file->private_data; | |
707 | int compat_negot; | |
708 | ||
709 | compat_negot = 0; | |
710 | if (!(pp->flags & PP_CLAIMED) && pp->pdev && | |
711 | (pp->state.mode != IEEE1284_MODE_COMPAT)) { | |
3c8db584 | 712 | struct ieee1284_info *info; |
1da177e4 LT |
713 | |
714 | /* parport released, but not in compatibility mode */ | |
783ea44d | 715 | parport_claim_or_block(pp->pdev); |
1da177e4 LT |
716 | pp->flags |= PP_CLAIMED; |
717 | info = &pp->pdev->port->ieee1284; | |
718 | pp->saved_state.mode = info->mode; | |
719 | pp->saved_state.phase = info->phase; | |
720 | info->mode = pp->state.mode; | |
721 | info->phase = pp->state.phase; | |
722 | compat_negot = 1; | |
723 | } else if ((pp->flags & PP_CLAIMED) && pp->pdev && | |
724 | (pp->pdev->port->ieee1284.mode != IEEE1284_MODE_COMPAT)) { | |
725 | compat_negot = 2; | |
726 | } | |
727 | if (compat_negot) { | |
783ea44d | 728 | parport_negotiate(pp->pdev->port, IEEE1284_MODE_COMPAT); |
396ec3de SM |
729 | dev_dbg(&pp->pdev->dev, |
730 | "negotiated back to compatibility mode because user-space forgot\n"); | |
1da177e4 LT |
731 | } |
732 | ||
733 | if (pp->flags & PP_CLAIMED) { | |
734 | struct ieee1284_info *info; | |
735 | ||
736 | info = &pp->pdev->port->ieee1284; | |
737 | pp->state.mode = info->mode; | |
738 | pp->state.phase = info->phase; | |
739 | info->mode = pp->saved_state.mode; | |
740 | info->phase = pp->saved_state.phase; | |
783ea44d | 741 | parport_release(pp->pdev); |
1da177e4 | 742 | if (compat_negot != 1) { |
81fc401e | 743 | pr_debug(CHRDEV "%x: released pardevice " |
1da177e4 LT |
744 | "because user-space forgot\n", minor); |
745 | } | |
746 | } | |
747 | ||
748 | if (pp->pdev) { | |
749 | const char *name = pp->pdev->name; | |
27f3b8a3 | 750 | |
783ea44d SM |
751 | parport_unregister_device(pp->pdev); |
752 | kfree(name); | |
1da177e4 | 753 | pp->pdev = NULL; |
81fc401e | 754 | pr_debug(CHRDEV "%x: unregistered pardevice\n", minor); |
1da177e4 LT |
755 | } |
756 | ||
783ea44d | 757 | kfree(pp); |
1da177e4 LT |
758 | |
759 | return 0; | |
760 | } | |
761 | ||
762 | /* No kernel lock held - fine */ | |
d85c1a2d | 763 | static unsigned int pp_poll(struct file *file, poll_table *wait) |
1da177e4 LT |
764 | { |
765 | struct pp_struct *pp = file->private_data; | |
766 | unsigned int mask = 0; | |
767 | ||
783ea44d SM |
768 | poll_wait(file, &pp->irq_wait, wait); |
769 | if (atomic_read(&pp->irqc)) | |
1da177e4 LT |
770 | mask |= POLLIN | POLLRDNORM; |
771 | ||
772 | return mask; | |
773 | } | |
774 | ||
ca8eca68 | 775 | static struct class *ppdev_class; |
1da177e4 | 776 | |
62322d25 | 777 | static const struct file_operations pp_fops = { |
1da177e4 LT |
778 | .owner = THIS_MODULE, |
779 | .llseek = no_llseek, | |
780 | .read = pp_read, | |
781 | .write = pp_write, | |
782 | .poll = pp_poll, | |
6d535d3e | 783 | .unlocked_ioctl = pp_ioctl, |
17a3596f BJZ |
784 | #ifdef CONFIG_COMPAT |
785 | .compat_ioctl = pp_compat_ioctl, | |
786 | #endif | |
1da177e4 LT |
787 | .open = pp_open, |
788 | .release = pp_release, | |
789 | }; | |
790 | ||
791 | static void pp_attach(struct parport *port) | |
792 | { | |
03457cd4 GKH |
793 | device_create(ppdev_class, port->dev, MKDEV(PP_MAJOR, port->number), |
794 | NULL, "parport%d", port->number); | |
1da177e4 LT |
795 | } |
796 | ||
797 | static void pp_detach(struct parport *port) | |
798 | { | |
04880eda | 799 | device_destroy(ppdev_class, MKDEV(PP_MAJOR, port->number)); |
1da177e4 LT |
800 | } |
801 | ||
802 | static struct parport_driver pp_driver = { | |
803 | .name = CHRDEV, | |
1701f680 | 804 | .attach = pp_attach, |
1da177e4 LT |
805 | .detach = pp_detach, |
806 | }; | |
807 | ||
783ea44d | 808 | static int __init ppdev_init(void) |
1da177e4 | 809 | { |
8ab5e4c1 | 810 | int err = 0; |
1da177e4 | 811 | |
783ea44d SM |
812 | if (register_chrdev(PP_MAJOR, CHRDEV, &pp_fops)) { |
813 | printk(KERN_WARNING CHRDEV ": unable to get major %d\n", | |
a7c71c07 | 814 | PP_MAJOR); |
1da177e4 LT |
815 | return -EIO; |
816 | } | |
ca8eca68 | 817 | ppdev_class = class_create(THIS_MODULE, CHRDEV); |
1da177e4 LT |
818 | if (IS_ERR(ppdev_class)) { |
819 | err = PTR_ERR(ppdev_class); | |
820 | goto out_chrdev; | |
821 | } | |
9a32bb39 AK |
822 | err = parport_register_driver(&pp_driver); |
823 | if (err < 0) { | |
783ea44d | 824 | printk(KERN_WARNING CHRDEV ": unable to register with parport\n"); |
1da177e4 LT |
825 | goto out_class; |
826 | } | |
827 | ||
783ea44d | 828 | printk(KERN_INFO PP_VERSION "\n"); |
1da177e4 LT |
829 | goto out; |
830 | ||
831 | out_class: | |
ca8eca68 | 832 | class_destroy(ppdev_class); |
1da177e4 LT |
833 | out_chrdev: |
834 | unregister_chrdev(PP_MAJOR, CHRDEV); | |
835 | out: | |
836 | return err; | |
837 | } | |
838 | ||
783ea44d | 839 | static void __exit ppdev_cleanup(void) |
1da177e4 | 840 | { |
1da177e4 | 841 | /* Clean up all parport stuff */ |
1da177e4 | 842 | parport_unregister_driver(&pp_driver); |
ca8eca68 | 843 | class_destroy(ppdev_class); |
783ea44d | 844 | unregister_chrdev(PP_MAJOR, CHRDEV); |
1da177e4 LT |
845 | } |
846 | ||
847 | module_init(ppdev_init); | |
848 | module_exit(ppdev_cleanup); | |
849 | ||
850 | MODULE_LICENSE("GPL"); | |
851 | MODULE_ALIAS_CHARDEV_MAJOR(PP_MAJOR); |