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; |
e7223f18 | 289 | struct pardev_cb ppdev_cb; |
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 | ||
e7223f18 SM |
302 | memset(&ppdev_cb, 0, sizeof(ppdev_cb)); |
303 | ppdev_cb.irq_func = pp_irq; | |
304 | ppdev_cb.flags = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0; | |
305 | ppdev_cb.private = pp; | |
306 | pdev = parport_register_dev_model(port, name, &ppdev_cb, minor); | |
783ea44d | 307 | parport_put_port(port); |
1da177e4 LT |
308 | |
309 | if (!pdev) { | |
783ea44d SM |
310 | printk(KERN_WARNING "%s: failed to register device!\n", name); |
311 | kfree(name); | |
1da177e4 LT |
312 | return -ENXIO; |
313 | } | |
314 | ||
315 | pp->pdev = pdev; | |
396ec3de | 316 | dev_dbg(&pdev->dev, "registered pardevice\n"); |
1da177e4 LT |
317 | return 0; |
318 | } | |
319 | ||
783ea44d | 320 | static enum ieee1284_phase init_phase(int mode) |
1da177e4 LT |
321 | { |
322 | switch (mode & ~(IEEE1284_DEVICEID | |
323 | | IEEE1284_ADDR)) { | |
324 | case IEEE1284_MODE_NIBBLE: | |
325 | case IEEE1284_MODE_BYTE: | |
326 | return IEEE1284_PH_REV_IDLE; | |
327 | } | |
328 | return IEEE1284_PH_FWD_IDLE; | |
329 | } | |
330 | ||
3b9ab374 BJZ |
331 | static int pp_set_timeout(struct pardevice *pdev, long tv_sec, int tv_usec) |
332 | { | |
333 | long to_jiffies; | |
334 | ||
335 | if ((tv_sec < 0) || (tv_usec < 0)) | |
336 | return -EINVAL; | |
337 | ||
338 | to_jiffies = usecs_to_jiffies(tv_usec); | |
339 | to_jiffies += tv_sec * HZ; | |
340 | if (to_jiffies <= 0) | |
341 | return -EINVAL; | |
342 | ||
343 | pdev->timeout = to_jiffies; | |
344 | return 0; | |
345 | } | |
346 | ||
6d535d3e | 347 | static int pp_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1da177e4 | 348 | { |
496ad9aa | 349 | unsigned int minor = iminor(file_inode(file)); |
1da177e4 | 350 | struct pp_struct *pp = file->private_data; |
d85c1a2d | 351 | struct parport *port; |
1da177e4 LT |
352 | void __user *argp = (void __user *)arg; |
353 | ||
354 | /* First handle the cases that don't take arguments. */ | |
355 | switch (cmd) { | |
356 | case PPCLAIM: | |
357 | { | |
358 | struct ieee1284_info *info; | |
359 | int ret; | |
360 | ||
361 | if (pp->flags & PP_CLAIMED) { | |
396ec3de | 362 | dev_dbg(&pp->pdev->dev, "you've already got it!\n"); |
1da177e4 LT |
363 | return -EINVAL; |
364 | } | |
365 | ||
366 | /* Deferred device registration. */ | |
367 | if (!pp->pdev) { | |
783ea44d | 368 | int err = register_device(minor, pp); |
27f3b8a3 | 369 | |
83e80605 | 370 | if (err) |
1da177e4 | 371 | return err; |
1da177e4 LT |
372 | } |
373 | ||
783ea44d | 374 | ret = parport_claim_or_block(pp->pdev); |
1da177e4 LT |
375 | if (ret < 0) |
376 | return ret; | |
377 | ||
378 | pp->flags |= PP_CLAIMED; | |
379 | ||
380 | /* For interrupt-reporting to work, we need to be | |
381 | * informed of each interrupt. */ | |
783ea44d | 382 | pp_enable_irq(pp); |
1da177e4 LT |
383 | |
384 | /* We may need to fix up the state machine. */ | |
385 | info = &pp->pdev->port->ieee1284; | |
386 | pp->saved_state.mode = info->mode; | |
387 | pp->saved_state.phase = info->phase; | |
388 | info->mode = pp->state.mode; | |
389 | info->phase = pp->state.phase; | |
783ea44d SM |
390 | pp->default_inactivity = parport_set_timeout(pp->pdev, 0); |
391 | parport_set_timeout(pp->pdev, pp->default_inactivity); | |
1da177e4 LT |
392 | |
393 | return 0; | |
394 | } | |
395 | case PPEXCL: | |
396 | if (pp->pdev) { | |
396ec3de SM |
397 | dev_dbg(&pp->pdev->dev, |
398 | "too late for PPEXCL; already registered\n"); | |
1da177e4 LT |
399 | if (pp->flags & PP_EXCL) |
400 | /* But it's not really an error. */ | |
401 | return 0; | |
402 | /* There's no chance of making the driver happy. */ | |
403 | return -EINVAL; | |
404 | } | |
405 | ||
406 | /* Just remember to register the device exclusively | |
407 | * when we finally do the registration. */ | |
408 | pp->flags |= PP_EXCL; | |
409 | return 0; | |
410 | case PPSETMODE: | |
411 | { | |
412 | int mode; | |
27f3b8a3 | 413 | |
783ea44d | 414 | if (copy_from_user(&mode, argp, sizeof(mode))) |
1da177e4 LT |
415 | return -EFAULT; |
416 | /* FIXME: validate mode */ | |
417 | pp->state.mode = mode; | |
783ea44d | 418 | pp->state.phase = init_phase(mode); |
1da177e4 LT |
419 | |
420 | if (pp->flags & PP_CLAIMED) { | |
421 | pp->pdev->port->ieee1284.mode = mode; | |
422 | pp->pdev->port->ieee1284.phase = pp->state.phase; | |
423 | } | |
424 | ||
425 | return 0; | |
426 | } | |
427 | case PPGETMODE: | |
428 | { | |
429 | int mode; | |
430 | ||
83e80605 | 431 | if (pp->flags & PP_CLAIMED) |
1da177e4 | 432 | mode = pp->pdev->port->ieee1284.mode; |
83e80605 | 433 | else |
1da177e4 | 434 | mode = pp->state.mode; |
83e80605 SM |
435 | |
436 | if (copy_to_user(argp, &mode, sizeof(mode))) | |
1da177e4 | 437 | return -EFAULT; |
1da177e4 LT |
438 | return 0; |
439 | } | |
440 | case PPSETPHASE: | |
441 | { | |
442 | int phase; | |
27f3b8a3 | 443 | |
83e80605 | 444 | if (copy_from_user(&phase, argp, sizeof(phase))) |
1da177e4 | 445 | return -EFAULT; |
83e80605 | 446 | |
1da177e4 LT |
447 | /* FIXME: validate phase */ |
448 | pp->state.phase = phase; | |
449 | ||
83e80605 | 450 | if (pp->flags & PP_CLAIMED) |
1da177e4 | 451 | pp->pdev->port->ieee1284.phase = phase; |
1da177e4 LT |
452 | |
453 | return 0; | |
454 | } | |
455 | case PPGETPHASE: | |
456 | { | |
457 | int phase; | |
458 | ||
83e80605 | 459 | if (pp->flags & PP_CLAIMED) |
1da177e4 | 460 | phase = pp->pdev->port->ieee1284.phase; |
83e80605 | 461 | else |
1da177e4 | 462 | phase = pp->state.phase; |
83e80605 | 463 | if (copy_to_user(argp, &phase, sizeof(phase))) |
1da177e4 | 464 | return -EFAULT; |
1da177e4 LT |
465 | return 0; |
466 | } | |
467 | case PPGETMODES: | |
468 | { | |
469 | unsigned int modes; | |
470 | ||
783ea44d | 471 | port = parport_find_number(minor); |
1da177e4 LT |
472 | if (!port) |
473 | return -ENODEV; | |
474 | ||
475 | modes = port->modes; | |
d98808a2 | 476 | parport_put_port(port); |
83e80605 | 477 | if (copy_to_user(argp, &modes, sizeof(modes))) |
1da177e4 | 478 | return -EFAULT; |
1da177e4 LT |
479 | return 0; |
480 | } | |
481 | case PPSETFLAGS: | |
482 | { | |
483 | int uflags; | |
484 | ||
83e80605 | 485 | if (copy_from_user(&uflags, argp, sizeof(uflags))) |
1da177e4 | 486 | return -EFAULT; |
1da177e4 LT |
487 | pp->flags &= ~PP_FLAGMASK; |
488 | pp->flags |= (uflags & PP_FLAGMASK); | |
489 | return 0; | |
490 | } | |
491 | case PPGETFLAGS: | |
492 | { | |
493 | int uflags; | |
494 | ||
495 | uflags = pp->flags & PP_FLAGMASK; | |
83e80605 | 496 | if (copy_to_user(argp, &uflags, sizeof(uflags))) |
1da177e4 | 497 | return -EFAULT; |
1da177e4 LT |
498 | return 0; |
499 | } | |
500 | } /* end switch() */ | |
501 | ||
502 | /* Everything else requires the port to be claimed, so check | |
503 | * that now. */ | |
504 | if ((pp->flags & PP_CLAIMED) == 0) { | |
81fc401e | 505 | pr_debug(CHRDEV "%x: claim the port first\n", minor); |
1da177e4 LT |
506 | return -EINVAL; |
507 | } | |
508 | ||
509 | port = pp->pdev->port; | |
510 | switch (cmd) { | |
511 | struct ieee1284_info *info; | |
512 | unsigned char reg; | |
513 | unsigned char mask; | |
514 | int mode; | |
3b9ab374 BJZ |
515 | s32 time32[2]; |
516 | s64 time64[2]; | |
517 | struct timespec64 ts; | |
1da177e4 | 518 | int ret; |
1da177e4 LT |
519 | |
520 | case PPRSTATUS: | |
783ea44d SM |
521 | reg = parport_read_status(port); |
522 | if (copy_to_user(argp, ®, sizeof(reg))) | |
1da177e4 LT |
523 | return -EFAULT; |
524 | return 0; | |
525 | case PPRDATA: | |
783ea44d SM |
526 | reg = parport_read_data(port); |
527 | if (copy_to_user(argp, ®, sizeof(reg))) | |
1da177e4 LT |
528 | return -EFAULT; |
529 | return 0; | |
530 | case PPRCONTROL: | |
783ea44d SM |
531 | reg = parport_read_control(port); |
532 | if (copy_to_user(argp, ®, sizeof(reg))) | |
1da177e4 LT |
533 | return -EFAULT; |
534 | return 0; | |
535 | case PPYIELD: | |
783ea44d | 536 | parport_yield_blocking(pp->pdev); |
1da177e4 LT |
537 | return 0; |
538 | ||
539 | case PPRELEASE: | |
540 | /* Save the state machine's state. */ | |
541 | info = &pp->pdev->port->ieee1284; | |
542 | pp->state.mode = info->mode; | |
543 | pp->state.phase = info->phase; | |
544 | info->mode = pp->saved_state.mode; | |
545 | info->phase = pp->saved_state.phase; | |
783ea44d | 546 | parport_release(pp->pdev); |
1da177e4 LT |
547 | pp->flags &= ~PP_CLAIMED; |
548 | return 0; | |
549 | ||
550 | case PPWCONTROL: | |
783ea44d | 551 | if (copy_from_user(®, argp, sizeof(reg))) |
1da177e4 | 552 | return -EFAULT; |
783ea44d | 553 | parport_write_control(port, reg); |
1da177e4 LT |
554 | return 0; |
555 | ||
556 | case PPWDATA: | |
783ea44d | 557 | if (copy_from_user(®, argp, sizeof(reg))) |
1da177e4 | 558 | return -EFAULT; |
783ea44d | 559 | parport_write_data(port, reg); |
1da177e4 LT |
560 | return 0; |
561 | ||
562 | case PPFCONTROL: | |
783ea44d | 563 | if (copy_from_user(&mask, argp, |
a7c71c07 | 564 | sizeof(mask))) |
1da177e4 | 565 | return -EFAULT; |
783ea44d | 566 | if (copy_from_user(®, 1 + (unsigned char __user *) arg, |
a7c71c07 | 567 | sizeof(reg))) |
1da177e4 | 568 | return -EFAULT; |
783ea44d | 569 | parport_frob_control(port, mask, reg); |
1da177e4 LT |
570 | return 0; |
571 | ||
572 | case PPDATADIR: | |
783ea44d | 573 | if (copy_from_user(&mode, argp, sizeof(mode))) |
1da177e4 LT |
574 | return -EFAULT; |
575 | if (mode) | |
783ea44d | 576 | port->ops->data_reverse(port); |
1da177e4 | 577 | else |
783ea44d | 578 | port->ops->data_forward(port); |
1da177e4 LT |
579 | return 0; |
580 | ||
581 | case PPNEGOT: | |
783ea44d | 582 | if (copy_from_user(&mode, argp, sizeof(mode))) |
1da177e4 | 583 | return -EFAULT; |
783ea44d | 584 | switch ((ret = parport_negotiate(port, mode))) { |
1da177e4 LT |
585 | case 0: break; |
586 | case -1: /* handshake failed, peripheral not IEEE 1284 */ | |
587 | ret = -EIO; | |
588 | break; | |
589 | case 1: /* handshake succeeded, peripheral rejected mode */ | |
590 | ret = -ENXIO; | |
591 | break; | |
592 | } | |
783ea44d | 593 | pp_enable_irq(pp); |
1da177e4 LT |
594 | return ret; |
595 | ||
596 | case PPWCTLONIRQ: | |
783ea44d | 597 | if (copy_from_user(®, argp, sizeof(reg))) |
1da177e4 LT |
598 | return -EFAULT; |
599 | ||
600 | /* Remember what to set the control lines to, for next | |
601 | * time we get an interrupt. */ | |
602 | pp->irqctl = reg; | |
603 | pp->irqresponse = 1; | |
604 | return 0; | |
605 | ||
606 | case PPCLRIRQ: | |
783ea44d SM |
607 | ret = atomic_read(&pp->irqc); |
608 | if (copy_to_user(argp, &ret, sizeof(ret))) | |
1da177e4 | 609 | return -EFAULT; |
783ea44d | 610 | atomic_sub(ret, &pp->irqc); |
1da177e4 LT |
611 | return 0; |
612 | ||
3b9ab374 BJZ |
613 | case PPSETTIME32: |
614 | if (copy_from_user(time32, argp, sizeof(time32))) | |
1da177e4 | 615 | return -EFAULT; |
3b9ab374 BJZ |
616 | |
617 | return pp_set_timeout(pp->pdev, time32[0], time32[1]); | |
618 | ||
619 | case PPSETTIME64: | |
620 | if (copy_from_user(time64, argp, sizeof(time64))) | |
621 | return -EFAULT; | |
622 | ||
623 | return pp_set_timeout(pp->pdev, time64[0], time64[1]); | |
624 | ||
625 | case PPGETTIME32: | |
626 | jiffies_to_timespec64(pp->pdev->timeout, &ts); | |
627 | time32[0] = ts.tv_sec; | |
628 | time32[1] = ts.tv_nsec / NSEC_PER_USEC; | |
629 | if ((time32[0] < 0) || (time32[1] < 0)) | |
1da177e4 | 630 | return -EINVAL; |
3b9ab374 BJZ |
631 | |
632 | if (copy_to_user(argp, time32, sizeof(time32))) | |
633 | return -EFAULT; | |
634 | ||
1da177e4 LT |
635 | return 0; |
636 | ||
3b9ab374 BJZ |
637 | case PPGETTIME64: |
638 | jiffies_to_timespec64(pp->pdev->timeout, &ts); | |
639 | time64[0] = ts.tv_sec; | |
640 | time64[1] = ts.tv_nsec / NSEC_PER_USEC; | |
641 | if ((time64[0] < 0) || (time64[1] < 0)) | |
642 | return -EINVAL; | |
643 | ||
644 | if (copy_to_user(argp, time64, sizeof(time64))) | |
1da177e4 | 645 | return -EFAULT; |
3b9ab374 | 646 | |
1da177e4 LT |
647 | return 0; |
648 | ||
649 | default: | |
396ec3de | 650 | dev_dbg(&pp->pdev->dev, "What? (cmd=0x%x)\n", cmd); |
1da177e4 LT |
651 | return -EINVAL; |
652 | } | |
653 | ||
654 | /* Keep the compiler happy */ | |
655 | return 0; | |
656 | } | |
657 | ||
6d535d3e AC |
658 | static long pp_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
659 | { | |
660 | long ret; | |
27f3b8a3 | 661 | |
613655fa | 662 | mutex_lock(&pp_do_mutex); |
6d535d3e | 663 | ret = pp_do_ioctl(file, cmd, arg); |
613655fa | 664 | mutex_unlock(&pp_do_mutex); |
6d535d3e AC |
665 | return ret; |
666 | } | |
667 | ||
17a3596f BJZ |
668 | #ifdef CONFIG_COMPAT |
669 | static long pp_compat_ioctl(struct file *file, unsigned int cmd, | |
a7c71c07 | 670 | unsigned long arg) |
17a3596f BJZ |
671 | { |
672 | return pp_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); | |
673 | } | |
674 | #endif | |
675 | ||
d85c1a2d | 676 | static int pp_open(struct inode *inode, struct file *file) |
1da177e4 LT |
677 | { |
678 | unsigned int minor = iminor(inode); | |
679 | struct pp_struct *pp; | |
680 | ||
681 | if (minor >= PARPORT_MAX) | |
682 | return -ENXIO; | |
683 | ||
783ea44d | 684 | pp = kmalloc(sizeof(struct pp_struct), GFP_KERNEL); |
1da177e4 LT |
685 | if (!pp) |
686 | return -ENOMEM; | |
687 | ||
688 | pp->state.mode = IEEE1284_MODE_COMPAT; | |
783ea44d | 689 | pp->state.phase = init_phase(pp->state.mode); |
1da177e4 LT |
690 | pp->flags = 0; |
691 | pp->irqresponse = 0; | |
783ea44d SM |
692 | atomic_set(&pp->irqc, 0); |
693 | init_waitqueue_head(&pp->irq_wait); | |
1da177e4 LT |
694 | |
695 | /* Defer the actual device registration until the first claim. | |
696 | * That way, we know whether or not the driver wants to have | |
697 | * exclusive access to the port (PPEXCL). | |
698 | */ | |
699 | pp->pdev = NULL; | |
700 | file->private_data = pp; | |
701 | ||
702 | return 0; | |
703 | } | |
704 | ||
d85c1a2d | 705 | static int pp_release(struct inode *inode, struct file *file) |
1da177e4 LT |
706 | { |
707 | unsigned int minor = iminor(inode); | |
708 | struct pp_struct *pp = file->private_data; | |
709 | int compat_negot; | |
710 | ||
711 | compat_negot = 0; | |
712 | if (!(pp->flags & PP_CLAIMED) && pp->pdev && | |
713 | (pp->state.mode != IEEE1284_MODE_COMPAT)) { | |
3c8db584 | 714 | struct ieee1284_info *info; |
1da177e4 LT |
715 | |
716 | /* parport released, but not in compatibility mode */ | |
783ea44d | 717 | parport_claim_or_block(pp->pdev); |
1da177e4 LT |
718 | pp->flags |= PP_CLAIMED; |
719 | info = &pp->pdev->port->ieee1284; | |
720 | pp->saved_state.mode = info->mode; | |
721 | pp->saved_state.phase = info->phase; | |
722 | info->mode = pp->state.mode; | |
723 | info->phase = pp->state.phase; | |
724 | compat_negot = 1; | |
725 | } else if ((pp->flags & PP_CLAIMED) && pp->pdev && | |
726 | (pp->pdev->port->ieee1284.mode != IEEE1284_MODE_COMPAT)) { | |
727 | compat_negot = 2; | |
728 | } | |
729 | if (compat_negot) { | |
783ea44d | 730 | parport_negotiate(pp->pdev->port, IEEE1284_MODE_COMPAT); |
396ec3de SM |
731 | dev_dbg(&pp->pdev->dev, |
732 | "negotiated back to compatibility mode because user-space forgot\n"); | |
1da177e4 LT |
733 | } |
734 | ||
735 | if (pp->flags & PP_CLAIMED) { | |
736 | struct ieee1284_info *info; | |
737 | ||
738 | info = &pp->pdev->port->ieee1284; | |
739 | pp->state.mode = info->mode; | |
740 | pp->state.phase = info->phase; | |
741 | info->mode = pp->saved_state.mode; | |
742 | info->phase = pp->saved_state.phase; | |
783ea44d | 743 | parport_release(pp->pdev); |
1da177e4 | 744 | if (compat_negot != 1) { |
81fc401e | 745 | pr_debug(CHRDEV "%x: released pardevice " |
1da177e4 LT |
746 | "because user-space forgot\n", minor); |
747 | } | |
748 | } | |
749 | ||
750 | if (pp->pdev) { | |
751 | const char *name = pp->pdev->name; | |
27f3b8a3 | 752 | |
783ea44d SM |
753 | parport_unregister_device(pp->pdev); |
754 | kfree(name); | |
1da177e4 | 755 | pp->pdev = NULL; |
81fc401e | 756 | pr_debug(CHRDEV "%x: unregistered pardevice\n", minor); |
1da177e4 LT |
757 | } |
758 | ||
783ea44d | 759 | kfree(pp); |
1da177e4 LT |
760 | |
761 | return 0; | |
762 | } | |
763 | ||
764 | /* No kernel lock held - fine */ | |
d85c1a2d | 765 | static unsigned int pp_poll(struct file *file, poll_table *wait) |
1da177e4 LT |
766 | { |
767 | struct pp_struct *pp = file->private_data; | |
768 | unsigned int mask = 0; | |
769 | ||
783ea44d SM |
770 | poll_wait(file, &pp->irq_wait, wait); |
771 | if (atomic_read(&pp->irqc)) | |
1da177e4 LT |
772 | mask |= POLLIN | POLLRDNORM; |
773 | ||
774 | return mask; | |
775 | } | |
776 | ||
ca8eca68 | 777 | static struct class *ppdev_class; |
1da177e4 | 778 | |
62322d25 | 779 | static const struct file_operations pp_fops = { |
1da177e4 LT |
780 | .owner = THIS_MODULE, |
781 | .llseek = no_llseek, | |
782 | .read = pp_read, | |
783 | .write = pp_write, | |
784 | .poll = pp_poll, | |
6d535d3e | 785 | .unlocked_ioctl = pp_ioctl, |
17a3596f BJZ |
786 | #ifdef CONFIG_COMPAT |
787 | .compat_ioctl = pp_compat_ioctl, | |
788 | #endif | |
1da177e4 LT |
789 | .open = pp_open, |
790 | .release = pp_release, | |
791 | }; | |
792 | ||
793 | static void pp_attach(struct parport *port) | |
794 | { | |
03457cd4 GKH |
795 | device_create(ppdev_class, port->dev, MKDEV(PP_MAJOR, port->number), |
796 | NULL, "parport%d", port->number); | |
1da177e4 LT |
797 | } |
798 | ||
799 | static void pp_detach(struct parport *port) | |
800 | { | |
04880eda | 801 | device_destroy(ppdev_class, MKDEV(PP_MAJOR, port->number)); |
1da177e4 LT |
802 | } |
803 | ||
e7223f18 SM |
804 | static int pp_probe(struct pardevice *par_dev) |
805 | { | |
806 | struct device_driver *drv = par_dev->dev.driver; | |
807 | int len = strlen(drv->name); | |
808 | ||
809 | if (strncmp(par_dev->name, drv->name, len)) | |
810 | return -ENODEV; | |
811 | ||
812 | return 0; | |
813 | } | |
814 | ||
1da177e4 LT |
815 | static struct parport_driver pp_driver = { |
816 | .name = CHRDEV, | |
e7223f18 SM |
817 | .probe = pp_probe, |
818 | .match_port = pp_attach, | |
1da177e4 | 819 | .detach = pp_detach, |
e7223f18 | 820 | .devmodel = true, |
1da177e4 LT |
821 | }; |
822 | ||
783ea44d | 823 | static int __init ppdev_init(void) |
1da177e4 | 824 | { |
8ab5e4c1 | 825 | int err = 0; |
1da177e4 | 826 | |
783ea44d SM |
827 | if (register_chrdev(PP_MAJOR, CHRDEV, &pp_fops)) { |
828 | printk(KERN_WARNING CHRDEV ": unable to get major %d\n", | |
a7c71c07 | 829 | PP_MAJOR); |
1da177e4 LT |
830 | return -EIO; |
831 | } | |
ca8eca68 | 832 | ppdev_class = class_create(THIS_MODULE, CHRDEV); |
1da177e4 LT |
833 | if (IS_ERR(ppdev_class)) { |
834 | err = PTR_ERR(ppdev_class); | |
835 | goto out_chrdev; | |
836 | } | |
9a32bb39 AK |
837 | err = parport_register_driver(&pp_driver); |
838 | if (err < 0) { | |
783ea44d | 839 | printk(KERN_WARNING CHRDEV ": unable to register with parport\n"); |
1da177e4 LT |
840 | goto out_class; |
841 | } | |
842 | ||
783ea44d | 843 | printk(KERN_INFO PP_VERSION "\n"); |
1da177e4 LT |
844 | goto out; |
845 | ||
846 | out_class: | |
ca8eca68 | 847 | class_destroy(ppdev_class); |
1da177e4 LT |
848 | out_chrdev: |
849 | unregister_chrdev(PP_MAJOR, CHRDEV); | |
850 | out: | |
851 | return err; | |
852 | } | |
853 | ||
783ea44d | 854 | static void __exit ppdev_cleanup(void) |
1da177e4 | 855 | { |
1da177e4 | 856 | /* Clean up all parport stuff */ |
1da177e4 | 857 | parport_unregister_driver(&pp_driver); |
ca8eca68 | 858 | class_destroy(ppdev_class); |
783ea44d | 859 | unregister_chrdev(PP_MAJOR, CHRDEV); |
1da177e4 LT |
860 | } |
861 | ||
862 | module_init(ppdev_init); | |
863 | module_exit(ppdev_cleanup); | |
864 | ||
865 | MODULE_LICENSE("GPL"); | |
866 | MODULE_ALIAS_CHARDEV_MAJOR(PP_MAJOR); |