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Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * linux/drivers/char/ppdev.c | |
4 | * | |
5 | * This is the code behind /dev/parport* -- it allows a user-space | |
6 | * application to use the parport subsystem. | |
7 | * | |
8 | * Copyright (C) 1998-2000, 2002 Tim Waugh <tim@cyberelk.net> | |
9 | * | |
1da177e4 LT |
10 | * A /dev/parportx device node represents an arbitrary device |
11 | * on port 'x'. The following operations are possible: | |
12 | * | |
13 | * open do nothing, set up default IEEE 1284 protocol to be COMPAT | |
14 | * close release port and unregister device (if necessary) | |
15 | * ioctl | |
16 | * EXCL register device exclusively (may fail) | |
17 | * CLAIM (register device first time) parport_claim_or_block | |
18 | * RELEASE parport_release | |
19 | * SETMODE set the IEEE 1284 protocol to use for read/write | |
20 | * SETPHASE set the IEEE 1284 phase of a particular mode. Not to be | |
21 | * confused with ioctl(fd, SETPHASER, &stun). ;-) | |
22 | * DATADIR data_forward / data_reverse | |
23 | * WDATA write_data | |
24 | * RDATA read_data | |
25 | * WCONTROL write_control | |
26 | * RCONTROL read_control | |
27 | * FCONTROL frob_control | |
28 | * RSTATUS read_status | |
29 | * NEGOT parport_negotiate | |
30 | * YIELD parport_yield_blocking | |
31 | * WCTLONIRQ on interrupt, set control lines | |
32 | * CLRIRQ clear (and return) interrupt count | |
33 | * SETTIME sets device timeout (struct timeval) | |
34 | * GETTIME gets device timeout (struct timeval) | |
35 | * GETMODES gets hardware supported modes (unsigned int) | |
36 | * GETMODE gets the current IEEE1284 mode | |
37 | * GETPHASE gets the current IEEE1284 phase | |
38 | * GETFLAGS gets current (user-visible) flags | |
39 | * SETFLAGS sets current (user-visible) flags | |
40 | * read/write read or write in current IEEE 1284 protocol | |
41 | * select wait for interrupt (in readfds) | |
42 | * | |
43 | * Changes: | |
44 | * Added SETTIME/GETTIME ioctl, Fred Barnes, 1999. | |
45 | * | |
46 | * Arnaldo Carvalho de Melo <acme@conectiva.com.br> 2000/08/25 | |
47 | * - On error, copy_from_user and copy_to_user do not return -EFAULT, | |
48 | * They return the positive number of bytes *not* copied due to address | |
49 | * space errors. | |
50 | * | |
51 | * Added GETMODES/GETMODE/GETPHASE ioctls, Fred Barnes <frmb2@ukc.ac.uk>, 03/01/2001. | |
52 | * Added GETFLAGS/SETFLAGS ioctls, Fred Barnes, 04/2001 | |
53 | */ | |
54 | ||
55 | #include <linux/module.h> | |
56 | #include <linux/init.h> | |
174cd4b1 | 57 | #include <linux/sched/signal.h> |
1da177e4 | 58 | #include <linux/device.h> |
1da177e4 LT |
59 | #include <linux/ioctl.h> |
60 | #include <linux/parport.h> | |
61 | #include <linux/ctype.h> | |
62 | #include <linux/poll.h> | |
5a0e3ad6 | 63 | #include <linux/slab.h> |
e6a67846 | 64 | #include <linux/major.h> |
1da177e4 | 65 | #include <linux/ppdev.h> |
613655fa | 66 | #include <linux/mutex.h> |
6d535d3e | 67 | #include <linux/uaccess.h> |
17a3596f | 68 | #include <linux/compat.h> |
1da177e4 LT |
69 | |
70 | #define PP_VERSION "ppdev: user-space parallel port driver" | |
71 | #define CHRDEV "ppdev" | |
72 | ||
73 | struct pp_struct { | |
d85c1a2d | 74 | struct pardevice *pdev; |
1da177e4 LT |
75 | wait_queue_head_t irq_wait; |
76 | atomic_t irqc; | |
77 | unsigned int flags; | |
78 | int irqresponse; | |
79 | unsigned char irqctl; | |
80 | struct ieee1284_info state; | |
81 | struct ieee1284_info saved_state; | |
82 | long default_inactivity; | |
9a69645d | 83 | int index; |
1da177e4 LT |
84 | }; |
85 | ||
dd5c472a SM |
86 | /* should we use PARDEVICE_MAX here? */ |
87 | static struct device *devices[PARPORT_MAX]; | |
88 | ||
9a69645d SM |
89 | static DEFINE_IDA(ida_index); |
90 | ||
1da177e4 LT |
91 | /* pp_struct.flags bitfields */ |
92 | #define PP_CLAIMED (1<<0) | |
93 | #define PP_EXCL (1<<1) | |
94 | ||
95 | /* Other constants */ | |
96 | #define PP_INTERRUPT_TIMEOUT (10 * HZ) /* 10s */ | |
97 | #define PP_BUFFER_SIZE 1024 | |
98 | #define PARDEVICE_MAX 8 | |
99 | ||
613655fa | 100 | static DEFINE_MUTEX(pp_do_mutex); |
3b9ab374 BJZ |
101 | |
102 | /* define fixed sized ioctl cmd for y2038 migration */ | |
103 | #define PPGETTIME32 _IOR(PP_IOCTL, 0x95, s32[2]) | |
104 | #define PPSETTIME32 _IOW(PP_IOCTL, 0x96, s32[2]) | |
105 | #define PPGETTIME64 _IOR(PP_IOCTL, 0x95, s64[2]) | |
106 | #define PPSETTIME64 _IOW(PP_IOCTL, 0x96, s64[2]) | |
107 | ||
783ea44d | 108 | static inline void pp_enable_irq(struct pp_struct *pp) |
1da177e4 LT |
109 | { |
110 | struct parport *port = pp->pdev->port; | |
27f3b8a3 | 111 | |
783ea44d | 112 | port->ops->enable_irq(port); |
1da177e4 LT |
113 | } |
114 | ||
d85c1a2d | 115 | static ssize_t pp_read(struct file *file, char __user *buf, size_t count, |
a7c71c07 | 116 | loff_t *ppos) |
1da177e4 | 117 | { |
496ad9aa | 118 | unsigned int minor = iminor(file_inode(file)); |
1da177e4 | 119 | struct pp_struct *pp = file->private_data; |
d85c1a2d | 120 | char *kbuffer; |
1da177e4 LT |
121 | ssize_t bytes_read = 0; |
122 | struct parport *pport; | |
123 | int mode; | |
124 | ||
125 | if (!(pp->flags & PP_CLAIMED)) { | |
126 | /* Don't have the port claimed */ | |
81fc401e | 127 | pr_debug(CHRDEV "%x: claim the port first\n", minor); |
1da177e4 LT |
128 | return -EINVAL; |
129 | } | |
130 | ||
131 | /* Trivial case. */ | |
132 | if (count == 0) | |
133 | return 0; | |
134 | ||
135 | kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL); | |
83e80605 | 136 | if (!kbuffer) |
1da177e4 | 137 | return -ENOMEM; |
1da177e4 LT |
138 | pport = pp->pdev->port; |
139 | mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR); | |
140 | ||
783ea44d | 141 | parport_set_timeout(pp->pdev, |
a7c71c07 SM |
142 | (file->f_flags & O_NONBLOCK) ? |
143 | PARPORT_INACTIVITY_O_NONBLOCK : | |
144 | pp->default_inactivity); | |
1da177e4 LT |
145 | |
146 | while (bytes_read == 0) { | |
147 | ssize_t need = min_t(unsigned long, count, PP_BUFFER_SIZE); | |
148 | ||
149 | if (mode == IEEE1284_MODE_EPP) { | |
150 | /* various specials for EPP mode */ | |
151 | int flags = 0; | |
152 | size_t (*fn)(struct parport *, void *, size_t, int); | |
153 | ||
83e80605 | 154 | if (pp->flags & PP_W91284PIC) |
1da177e4 | 155 | flags |= PARPORT_W91284PIC; |
83e80605 | 156 | if (pp->flags & PP_FASTREAD) |
1da177e4 | 157 | flags |= PARPORT_EPP_FAST; |
83e80605 | 158 | if (pport->ieee1284.mode & IEEE1284_ADDR) |
1da177e4 | 159 | fn = pport->ops->epp_read_addr; |
83e80605 | 160 | else |
1da177e4 | 161 | fn = pport->ops->epp_read_data; |
1da177e4 LT |
162 | bytes_read = (*fn)(pport, kbuffer, need, flags); |
163 | } else { | |
783ea44d | 164 | bytes_read = parport_read(pport, kbuffer, need); |
1da177e4 LT |
165 | } |
166 | ||
167 | if (bytes_read != 0) | |
168 | break; | |
169 | ||
170 | if (file->f_flags & O_NONBLOCK) { | |
171 | bytes_read = -EAGAIN; | |
172 | break; | |
173 | } | |
174 | ||
783ea44d | 175 | if (signal_pending(current)) { |
1da177e4 LT |
176 | bytes_read = -ERESTARTSYS; |
177 | break; | |
178 | } | |
179 | ||
180 | cond_resched(); | |
181 | } | |
182 | ||
783ea44d | 183 | parport_set_timeout(pp->pdev, pp->default_inactivity); |
1da177e4 | 184 | |
783ea44d | 185 | if (bytes_read > 0 && copy_to_user(buf, kbuffer, bytes_read)) |
1da177e4 LT |
186 | bytes_read = -EFAULT; |
187 | ||
783ea44d SM |
188 | kfree(kbuffer); |
189 | pp_enable_irq(pp); | |
1da177e4 LT |
190 | return bytes_read; |
191 | } | |
192 | ||
d85c1a2d | 193 | static ssize_t pp_write(struct file *file, const char __user *buf, |
a7c71c07 | 194 | size_t count, loff_t *ppos) |
1da177e4 | 195 | { |
496ad9aa | 196 | unsigned int minor = iminor(file_inode(file)); |
1da177e4 | 197 | struct pp_struct *pp = file->private_data; |
d85c1a2d | 198 | char *kbuffer; |
1da177e4 LT |
199 | ssize_t bytes_written = 0; |
200 | ssize_t wrote; | |
201 | int mode; | |
202 | struct parport *pport; | |
203 | ||
204 | if (!(pp->flags & PP_CLAIMED)) { | |
205 | /* Don't have the port claimed */ | |
81fc401e | 206 | pr_debug(CHRDEV "%x: claim the port first\n", minor); |
1da177e4 LT |
207 | return -EINVAL; |
208 | } | |
209 | ||
210 | kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL); | |
83e80605 | 211 | if (!kbuffer) |
1da177e4 | 212 | return -ENOMEM; |
83e80605 | 213 | |
1da177e4 LT |
214 | pport = pp->pdev->port; |
215 | mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR); | |
216 | ||
783ea44d | 217 | parport_set_timeout(pp->pdev, |
a7c71c07 SM |
218 | (file->f_flags & O_NONBLOCK) ? |
219 | PARPORT_INACTIVITY_O_NONBLOCK : | |
220 | pp->default_inactivity); | |
1da177e4 LT |
221 | |
222 | while (bytes_written < count) { | |
223 | ssize_t n = min_t(unsigned long, count - bytes_written, PP_BUFFER_SIZE); | |
224 | ||
783ea44d | 225 | if (copy_from_user(kbuffer, buf + bytes_written, n)) { |
1da177e4 LT |
226 | bytes_written = -EFAULT; |
227 | break; | |
228 | } | |
229 | ||
230 | if ((pp->flags & PP_FASTWRITE) && (mode == IEEE1284_MODE_EPP)) { | |
231 | /* do a fast EPP write */ | |
232 | if (pport->ieee1284.mode & IEEE1284_ADDR) { | |
783ea44d | 233 | wrote = pport->ops->epp_write_addr(pport, |
1da177e4 LT |
234 | kbuffer, n, PARPORT_EPP_FAST); |
235 | } else { | |
783ea44d | 236 | wrote = pport->ops->epp_write_data(pport, |
1da177e4 LT |
237 | kbuffer, n, PARPORT_EPP_FAST); |
238 | } | |
239 | } else { | |
783ea44d | 240 | wrote = parport_write(pp->pdev->port, kbuffer, n); |
1da177e4 LT |
241 | } |
242 | ||
243 | if (wrote <= 0) { | |
83e80605 | 244 | if (!bytes_written) |
1da177e4 | 245 | bytes_written = wrote; |
1da177e4 LT |
246 | break; |
247 | } | |
248 | ||
249 | bytes_written += wrote; | |
250 | ||
251 | if (file->f_flags & O_NONBLOCK) { | |
252 | if (!bytes_written) | |
253 | bytes_written = -EAGAIN; | |
254 | break; | |
255 | } | |
256 | ||
783ea44d | 257 | if (signal_pending(current)) |
1da177e4 | 258 | break; |
1da177e4 LT |
259 | |
260 | cond_resched(); | |
261 | } | |
262 | ||
783ea44d | 263 | parport_set_timeout(pp->pdev, pp->default_inactivity); |
1da177e4 | 264 | |
783ea44d SM |
265 | kfree(kbuffer); |
266 | pp_enable_irq(pp); | |
1da177e4 LT |
267 | return bytes_written; |
268 | } | |
269 | ||
783ea44d | 270 | static void pp_irq(void *private) |
1da177e4 | 271 | { |
5712cb3d | 272 | struct pp_struct *pp = private; |
1da177e4 LT |
273 | |
274 | if (pp->irqresponse) { | |
783ea44d | 275 | parport_write_control(pp->pdev->port, pp->irqctl); |
1da177e4 LT |
276 | pp->irqresponse = 0; |
277 | } | |
278 | ||
783ea44d SM |
279 | atomic_inc(&pp->irqc); |
280 | wake_up_interruptible(&pp->irq_wait); | |
1da177e4 LT |
281 | } |
282 | ||
783ea44d | 283 | static int register_device(int minor, struct pp_struct *pp) |
1da177e4 LT |
284 | { |
285 | struct parport *port; | |
d85c1a2d | 286 | struct pardevice *pdev = NULL; |
1da177e4 | 287 | char *name; |
8b7d3a9d | 288 | struct pardev_cb ppdev_cb; |
9a69645d | 289 | int rc = 0, index; |
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) { |
826a4c65 | 297 | pr_warn("%s: no associated port!\n", name); |
0fa2c8eb CIK |
298 | rc = -ENXIO; |
299 | goto err; | |
1da177e4 LT |
300 | } |
301 | ||
9a69645d | 302 | index = ida_simple_get(&ida_index, 0, 0, GFP_KERNEL); |
8b7d3a9d SM |
303 | memset(&ppdev_cb, 0, sizeof(ppdev_cb)); |
304 | ppdev_cb.irq_func = pp_irq; | |
305 | ppdev_cb.flags = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0; | |
306 | ppdev_cb.private = pp; | |
9a69645d | 307 | pdev = parport_register_dev_model(port, name, &ppdev_cb, index); |
783ea44d | 308 | parport_put_port(port); |
1da177e4 LT |
309 | |
310 | if (!pdev) { | |
826a4c65 | 311 | pr_warn("%s: failed to register device!\n", name); |
0fa2c8eb | 312 | rc = -ENXIO; |
9a69645d | 313 | ida_simple_remove(&ida_index, index); |
0fa2c8eb | 314 | goto err; |
1da177e4 LT |
315 | } |
316 | ||
317 | pp->pdev = pdev; | |
9a69645d | 318 | pp->index = index; |
396ec3de | 319 | dev_dbg(&pdev->dev, "registered pardevice\n"); |
0fa2c8eb CIK |
320 | err: |
321 | kfree(name); | |
322 | return rc; | |
1da177e4 LT |
323 | } |
324 | ||
783ea44d | 325 | static enum ieee1284_phase init_phase(int mode) |
1da177e4 LT |
326 | { |
327 | switch (mode & ~(IEEE1284_DEVICEID | |
328 | | IEEE1284_ADDR)) { | |
329 | case IEEE1284_MODE_NIBBLE: | |
330 | case IEEE1284_MODE_BYTE: | |
331 | return IEEE1284_PH_REV_IDLE; | |
332 | } | |
333 | return IEEE1284_PH_FWD_IDLE; | |
334 | } | |
335 | ||
3b9ab374 BJZ |
336 | static int pp_set_timeout(struct pardevice *pdev, long tv_sec, int tv_usec) |
337 | { | |
338 | long to_jiffies; | |
339 | ||
340 | if ((tv_sec < 0) || (tv_usec < 0)) | |
341 | return -EINVAL; | |
342 | ||
343 | to_jiffies = usecs_to_jiffies(tv_usec); | |
344 | to_jiffies += tv_sec * HZ; | |
345 | if (to_jiffies <= 0) | |
346 | return -EINVAL; | |
347 | ||
348 | pdev->timeout = to_jiffies; | |
349 | return 0; | |
350 | } | |
351 | ||
6d535d3e | 352 | static int pp_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1da177e4 | 353 | { |
496ad9aa | 354 | unsigned int minor = iminor(file_inode(file)); |
1da177e4 | 355 | struct pp_struct *pp = file->private_data; |
d85c1a2d | 356 | struct parport *port; |
1da177e4 | 357 | void __user *argp = (void __user *)arg; |
78856f25 KC |
358 | struct ieee1284_info *info; |
359 | unsigned char reg; | |
360 | unsigned char mask; | |
361 | int mode; | |
362 | s32 time32[2]; | |
363 | s64 time64[2]; | |
364 | struct timespec64 ts; | |
365 | int ret; | |
1da177e4 LT |
366 | |
367 | /* First handle the cases that don't take arguments. */ | |
368 | switch (cmd) { | |
369 | case PPCLAIM: | |
370 | { | |
1da177e4 | 371 | if (pp->flags & PP_CLAIMED) { |
396ec3de | 372 | dev_dbg(&pp->pdev->dev, "you've already got it!\n"); |
1da177e4 LT |
373 | return -EINVAL; |
374 | } | |
375 | ||
376 | /* Deferred device registration. */ | |
377 | if (!pp->pdev) { | |
783ea44d | 378 | int err = register_device(minor, pp); |
27f3b8a3 | 379 | |
83e80605 | 380 | if (err) |
1da177e4 | 381 | return err; |
1da177e4 LT |
382 | } |
383 | ||
783ea44d | 384 | ret = parport_claim_or_block(pp->pdev); |
1da177e4 LT |
385 | if (ret < 0) |
386 | return ret; | |
387 | ||
388 | pp->flags |= PP_CLAIMED; | |
389 | ||
390 | /* For interrupt-reporting to work, we need to be | |
391 | * informed of each interrupt. */ | |
783ea44d | 392 | pp_enable_irq(pp); |
1da177e4 LT |
393 | |
394 | /* We may need to fix up the state machine. */ | |
395 | info = &pp->pdev->port->ieee1284; | |
396 | pp->saved_state.mode = info->mode; | |
397 | pp->saved_state.phase = info->phase; | |
398 | info->mode = pp->state.mode; | |
399 | info->phase = pp->state.phase; | |
783ea44d SM |
400 | pp->default_inactivity = parport_set_timeout(pp->pdev, 0); |
401 | parport_set_timeout(pp->pdev, pp->default_inactivity); | |
1da177e4 LT |
402 | |
403 | return 0; | |
404 | } | |
405 | case PPEXCL: | |
406 | if (pp->pdev) { | |
396ec3de SM |
407 | dev_dbg(&pp->pdev->dev, |
408 | "too late for PPEXCL; already registered\n"); | |
1da177e4 LT |
409 | if (pp->flags & PP_EXCL) |
410 | /* But it's not really an error. */ | |
411 | return 0; | |
412 | /* There's no chance of making the driver happy. */ | |
413 | return -EINVAL; | |
414 | } | |
415 | ||
416 | /* Just remember to register the device exclusively | |
417 | * when we finally do the registration. */ | |
418 | pp->flags |= PP_EXCL; | |
419 | return 0; | |
420 | case PPSETMODE: | |
421 | { | |
422 | int mode; | |
27f3b8a3 | 423 | |
783ea44d | 424 | if (copy_from_user(&mode, argp, sizeof(mode))) |
1da177e4 LT |
425 | return -EFAULT; |
426 | /* FIXME: validate mode */ | |
427 | pp->state.mode = mode; | |
783ea44d | 428 | pp->state.phase = init_phase(mode); |
1da177e4 LT |
429 | |
430 | if (pp->flags & PP_CLAIMED) { | |
431 | pp->pdev->port->ieee1284.mode = mode; | |
432 | pp->pdev->port->ieee1284.phase = pp->state.phase; | |
433 | } | |
434 | ||
435 | return 0; | |
436 | } | |
437 | case PPGETMODE: | |
438 | { | |
439 | int mode; | |
440 | ||
83e80605 | 441 | if (pp->flags & PP_CLAIMED) |
1da177e4 | 442 | mode = pp->pdev->port->ieee1284.mode; |
83e80605 | 443 | else |
1da177e4 | 444 | mode = pp->state.mode; |
83e80605 SM |
445 | |
446 | if (copy_to_user(argp, &mode, sizeof(mode))) | |
1da177e4 | 447 | return -EFAULT; |
1da177e4 LT |
448 | return 0; |
449 | } | |
450 | case PPSETPHASE: | |
451 | { | |
452 | int phase; | |
27f3b8a3 | 453 | |
83e80605 | 454 | if (copy_from_user(&phase, argp, sizeof(phase))) |
1da177e4 | 455 | return -EFAULT; |
83e80605 | 456 | |
1da177e4 LT |
457 | /* FIXME: validate phase */ |
458 | pp->state.phase = phase; | |
459 | ||
83e80605 | 460 | if (pp->flags & PP_CLAIMED) |
1da177e4 | 461 | pp->pdev->port->ieee1284.phase = phase; |
1da177e4 LT |
462 | |
463 | return 0; | |
464 | } | |
465 | case PPGETPHASE: | |
466 | { | |
467 | int phase; | |
468 | ||
83e80605 | 469 | if (pp->flags & PP_CLAIMED) |
1da177e4 | 470 | phase = pp->pdev->port->ieee1284.phase; |
83e80605 | 471 | else |
1da177e4 | 472 | phase = pp->state.phase; |
83e80605 | 473 | if (copy_to_user(argp, &phase, sizeof(phase))) |
1da177e4 | 474 | return -EFAULT; |
1da177e4 LT |
475 | return 0; |
476 | } | |
477 | case PPGETMODES: | |
478 | { | |
479 | unsigned int modes; | |
480 | ||
783ea44d | 481 | port = parport_find_number(minor); |
1da177e4 LT |
482 | if (!port) |
483 | return -ENODEV; | |
484 | ||
485 | modes = port->modes; | |
d98808a2 | 486 | parport_put_port(port); |
83e80605 | 487 | if (copy_to_user(argp, &modes, sizeof(modes))) |
1da177e4 | 488 | return -EFAULT; |
1da177e4 LT |
489 | return 0; |
490 | } | |
491 | case PPSETFLAGS: | |
492 | { | |
493 | int uflags; | |
494 | ||
83e80605 | 495 | if (copy_from_user(&uflags, argp, sizeof(uflags))) |
1da177e4 | 496 | return -EFAULT; |
1da177e4 LT |
497 | pp->flags &= ~PP_FLAGMASK; |
498 | pp->flags |= (uflags & PP_FLAGMASK); | |
499 | return 0; | |
500 | } | |
501 | case PPGETFLAGS: | |
502 | { | |
503 | int uflags; | |
504 | ||
505 | uflags = pp->flags & PP_FLAGMASK; | |
83e80605 | 506 | if (copy_to_user(argp, &uflags, sizeof(uflags))) |
1da177e4 | 507 | return -EFAULT; |
1da177e4 LT |
508 | return 0; |
509 | } | |
510 | } /* end switch() */ | |
511 | ||
512 | /* Everything else requires the port to be claimed, so check | |
513 | * that now. */ | |
514 | if ((pp->flags & PP_CLAIMED) == 0) { | |
81fc401e | 515 | pr_debug(CHRDEV "%x: claim the port first\n", minor); |
1da177e4 LT |
516 | return -EINVAL; |
517 | } | |
518 | ||
519 | port = pp->pdev->port; | |
520 | switch (cmd) { | |
1da177e4 | 521 | case PPRSTATUS: |
783ea44d SM |
522 | reg = parport_read_status(port); |
523 | if (copy_to_user(argp, ®, sizeof(reg))) | |
1da177e4 LT |
524 | return -EFAULT; |
525 | return 0; | |
526 | case PPRDATA: | |
783ea44d SM |
527 | reg = parport_read_data(port); |
528 | if (copy_to_user(argp, ®, sizeof(reg))) | |
1da177e4 LT |
529 | return -EFAULT; |
530 | return 0; | |
531 | case PPRCONTROL: | |
783ea44d SM |
532 | reg = parport_read_control(port); |
533 | if (copy_to_user(argp, ®, sizeof(reg))) | |
1da177e4 LT |
534 | return -EFAULT; |
535 | return 0; | |
536 | case PPYIELD: | |
783ea44d | 537 | parport_yield_blocking(pp->pdev); |
1da177e4 LT |
538 | return 0; |
539 | ||
540 | case PPRELEASE: | |
541 | /* Save the state machine's state. */ | |
542 | info = &pp->pdev->port->ieee1284; | |
543 | pp->state.mode = info->mode; | |
544 | pp->state.phase = info->phase; | |
545 | info->mode = pp->saved_state.mode; | |
546 | info->phase = pp->saved_state.phase; | |
783ea44d | 547 | parport_release(pp->pdev); |
1da177e4 LT |
548 | pp->flags &= ~PP_CLAIMED; |
549 | return 0; | |
550 | ||
551 | case PPWCONTROL: | |
783ea44d | 552 | if (copy_from_user(®, argp, sizeof(reg))) |
1da177e4 | 553 | return -EFAULT; |
783ea44d | 554 | parport_write_control(port, reg); |
1da177e4 LT |
555 | return 0; |
556 | ||
557 | case PPWDATA: | |
783ea44d | 558 | if (copy_from_user(®, argp, sizeof(reg))) |
1da177e4 | 559 | return -EFAULT; |
783ea44d | 560 | parport_write_data(port, reg); |
1da177e4 LT |
561 | return 0; |
562 | ||
563 | case PPFCONTROL: | |
783ea44d | 564 | if (copy_from_user(&mask, argp, |
a7c71c07 | 565 | sizeof(mask))) |
1da177e4 | 566 | return -EFAULT; |
783ea44d | 567 | if (copy_from_user(®, 1 + (unsigned char __user *) arg, |
a7c71c07 | 568 | sizeof(reg))) |
1da177e4 | 569 | return -EFAULT; |
783ea44d | 570 | parport_frob_control(port, mask, reg); |
1da177e4 LT |
571 | return 0; |
572 | ||
573 | case PPDATADIR: | |
783ea44d | 574 | if (copy_from_user(&mode, argp, sizeof(mode))) |
1da177e4 LT |
575 | return -EFAULT; |
576 | if (mode) | |
783ea44d | 577 | port->ops->data_reverse(port); |
1da177e4 | 578 | else |
783ea44d | 579 | port->ops->data_forward(port); |
1da177e4 LT |
580 | return 0; |
581 | ||
582 | case PPNEGOT: | |
783ea44d | 583 | if (copy_from_user(&mode, argp, sizeof(mode))) |
1da177e4 | 584 | return -EFAULT; |
783ea44d | 585 | switch ((ret = parport_negotiate(port, mode))) { |
1da177e4 LT |
586 | case 0: break; |
587 | case -1: /* handshake failed, peripheral not IEEE 1284 */ | |
588 | ret = -EIO; | |
589 | break; | |
590 | case 1: /* handshake succeeded, peripheral rejected mode */ | |
591 | ret = -ENXIO; | |
592 | break; | |
593 | } | |
783ea44d | 594 | pp_enable_irq(pp); |
1da177e4 LT |
595 | return ret; |
596 | ||
597 | case PPWCTLONIRQ: | |
783ea44d | 598 | if (copy_from_user(®, argp, sizeof(reg))) |
1da177e4 LT |
599 | return -EFAULT; |
600 | ||
601 | /* Remember what to set the control lines to, for next | |
602 | * time we get an interrupt. */ | |
603 | pp->irqctl = reg; | |
604 | pp->irqresponse = 1; | |
605 | return 0; | |
606 | ||
607 | case PPCLRIRQ: | |
783ea44d SM |
608 | ret = atomic_read(&pp->irqc); |
609 | if (copy_to_user(argp, &ret, sizeof(ret))) | |
1da177e4 | 610 | return -EFAULT; |
783ea44d | 611 | atomic_sub(ret, &pp->irqc); |
1da177e4 LT |
612 | return 0; |
613 | ||
3b9ab374 BJZ |
614 | case PPSETTIME32: |
615 | if (copy_from_user(time32, argp, sizeof(time32))) | |
1da177e4 | 616 | return -EFAULT; |
3b9ab374 | 617 | |
99817404 AB |
618 | if ((time32[0] < 0) || (time32[1] < 0)) |
619 | return -EINVAL; | |
620 | ||
3b9ab374 BJZ |
621 | return pp_set_timeout(pp->pdev, time32[0], time32[1]); |
622 | ||
623 | case PPSETTIME64: | |
624 | if (copy_from_user(time64, argp, sizeof(time64))) | |
625 | return -EFAULT; | |
626 | ||
99817404 AB |
627 | if ((time64[0] < 0) || (time64[1] < 0)) |
628 | return -EINVAL; | |
629 | ||
630 | if (IS_ENABLED(CONFIG_SPARC64) && !in_compat_syscall()) | |
631 | time64[1] >>= 32; | |
632 | ||
3b9ab374 BJZ |
633 | return pp_set_timeout(pp->pdev, time64[0], time64[1]); |
634 | ||
635 | case PPGETTIME32: | |
636 | jiffies_to_timespec64(pp->pdev->timeout, &ts); | |
637 | time32[0] = ts.tv_sec; | |
638 | time32[1] = ts.tv_nsec / NSEC_PER_USEC; | |
3b9ab374 BJZ |
639 | |
640 | if (copy_to_user(argp, time32, sizeof(time32))) | |
641 | return -EFAULT; | |
642 | ||
1da177e4 LT |
643 | return 0; |
644 | ||
3b9ab374 BJZ |
645 | case PPGETTIME64: |
646 | jiffies_to_timespec64(pp->pdev->timeout, &ts); | |
647 | time64[0] = ts.tv_sec; | |
648 | time64[1] = ts.tv_nsec / NSEC_PER_USEC; | |
99817404 AB |
649 | |
650 | if (IS_ENABLED(CONFIG_SPARC64) && !in_compat_syscall()) | |
651 | time64[1] <<= 32; | |
3b9ab374 BJZ |
652 | |
653 | if (copy_to_user(argp, time64, sizeof(time64))) | |
1da177e4 | 654 | return -EFAULT; |
3b9ab374 | 655 | |
1da177e4 LT |
656 | return 0; |
657 | ||
658 | default: | |
396ec3de | 659 | dev_dbg(&pp->pdev->dev, "What? (cmd=0x%x)\n", cmd); |
1da177e4 LT |
660 | return -EINVAL; |
661 | } | |
662 | ||
663 | /* Keep the compiler happy */ | |
664 | return 0; | |
665 | } | |
666 | ||
6d535d3e AC |
667 | static long pp_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
668 | { | |
669 | long ret; | |
27f3b8a3 | 670 | |
613655fa | 671 | mutex_lock(&pp_do_mutex); |
6d535d3e | 672 | ret = pp_do_ioctl(file, cmd, arg); |
613655fa | 673 | mutex_unlock(&pp_do_mutex); |
6d535d3e AC |
674 | return ret; |
675 | } | |
676 | ||
d85c1a2d | 677 | static int pp_open(struct inode *inode, struct file *file) |
1da177e4 LT |
678 | { |
679 | unsigned int minor = iminor(inode); | |
680 | struct pp_struct *pp; | |
681 | ||
682 | if (minor >= PARPORT_MAX) | |
683 | return -ENXIO; | |
684 | ||
783ea44d | 685 | pp = kmalloc(sizeof(struct pp_struct), GFP_KERNEL); |
1da177e4 LT |
686 | if (!pp) |
687 | return -ENOMEM; | |
688 | ||
689 | pp->state.mode = IEEE1284_MODE_COMPAT; | |
783ea44d | 690 | pp->state.phase = init_phase(pp->state.mode); |
1da177e4 LT |
691 | pp->flags = 0; |
692 | pp->irqresponse = 0; | |
783ea44d SM |
693 | atomic_set(&pp->irqc, 0); |
694 | init_waitqueue_head(&pp->irq_wait); | |
1da177e4 LT |
695 | |
696 | /* Defer the actual device registration until the first claim. | |
697 | * That way, we know whether or not the driver wants to have | |
698 | * exclusive access to the port (PPEXCL). | |
699 | */ | |
700 | pp->pdev = NULL; | |
701 | file->private_data = pp; | |
702 | ||
703 | return 0; | |
704 | } | |
705 | ||
d85c1a2d | 706 | static int pp_release(struct inode *inode, struct file *file) |
1da177e4 LT |
707 | { |
708 | unsigned int minor = iminor(inode); | |
709 | struct pp_struct *pp = file->private_data; | |
710 | int compat_negot; | |
711 | ||
712 | compat_negot = 0; | |
713 | if (!(pp->flags & PP_CLAIMED) && pp->pdev && | |
714 | (pp->state.mode != IEEE1284_MODE_COMPAT)) { | |
3c8db584 | 715 | struct ieee1284_info *info; |
1da177e4 LT |
716 | |
717 | /* parport released, but not in compatibility mode */ | |
783ea44d | 718 | parport_claim_or_block(pp->pdev); |
1da177e4 LT |
719 | pp->flags |= PP_CLAIMED; |
720 | info = &pp->pdev->port->ieee1284; | |
721 | pp->saved_state.mode = info->mode; | |
722 | pp->saved_state.phase = info->phase; | |
723 | info->mode = pp->state.mode; | |
724 | info->phase = pp->state.phase; | |
725 | compat_negot = 1; | |
726 | } else if ((pp->flags & PP_CLAIMED) && pp->pdev && | |
727 | (pp->pdev->port->ieee1284.mode != IEEE1284_MODE_COMPAT)) { | |
728 | compat_negot = 2; | |
729 | } | |
730 | if (compat_negot) { | |
783ea44d | 731 | parport_negotiate(pp->pdev->port, IEEE1284_MODE_COMPAT); |
396ec3de SM |
732 | dev_dbg(&pp->pdev->dev, |
733 | "negotiated back to compatibility mode because user-space forgot\n"); | |
1da177e4 LT |
734 | } |
735 | ||
7bdd9695 | 736 | if ((pp->flags & PP_CLAIMED) && pp->pdev) { |
1da177e4 LT |
737 | struct ieee1284_info *info; |
738 | ||
739 | info = &pp->pdev->port->ieee1284; | |
740 | pp->state.mode = info->mode; | |
741 | pp->state.phase = info->phase; | |
742 | info->mode = pp->saved_state.mode; | |
743 | info->phase = pp->saved_state.phase; | |
783ea44d | 744 | parport_release(pp->pdev); |
1da177e4 | 745 | if (compat_negot != 1) { |
81fc401e | 746 | pr_debug(CHRDEV "%x: released pardevice " |
1da177e4 LT |
747 | "because user-space forgot\n", minor); |
748 | } | |
749 | } | |
750 | ||
751 | if (pp->pdev) { | |
783ea44d | 752 | parport_unregister_device(pp->pdev); |
9a69645d | 753 | ida_simple_remove(&ida_index, pp->index); |
1da177e4 | 754 | pp->pdev = NULL; |
81fc401e | 755 | pr_debug(CHRDEV "%x: unregistered pardevice\n", minor); |
1da177e4 LT |
756 | } |
757 | ||
783ea44d | 758 | kfree(pp); |
1da177e4 LT |
759 | |
760 | return 0; | |
761 | } | |
762 | ||
763 | /* No kernel lock held - fine */ | |
afc9a42b | 764 | static __poll_t pp_poll(struct file *file, poll_table *wait) |
1da177e4 LT |
765 | { |
766 | struct pp_struct *pp = file->private_data; | |
afc9a42b | 767 | __poll_t mask = 0; |
1da177e4 | 768 | |
783ea44d SM |
769 | poll_wait(file, &pp->irq_wait, wait); |
770 | if (atomic_read(&pp->irqc)) | |
a9a08845 | 771 | mask |= EPOLLIN | EPOLLRDNORM; |
1da177e4 LT |
772 | |
773 | return mask; | |
774 | } | |
775 | ||
ca8eca68 | 776 | static struct class *ppdev_class; |
1da177e4 | 777 | |
62322d25 | 778 | static const struct file_operations pp_fops = { |
1da177e4 LT |
779 | .owner = THIS_MODULE, |
780 | .llseek = no_llseek, | |
781 | .read = pp_read, | |
782 | .write = pp_write, | |
783 | .poll = pp_poll, | |
6d535d3e | 784 | .unlocked_ioctl = pp_ioctl, |
407e9ef7 | 785 | .compat_ioctl = compat_ptr_ioctl, |
1da177e4 LT |
786 | .open = pp_open, |
787 | .release = pp_release, | |
788 | }; | |
789 | ||
790 | static void pp_attach(struct parport *port) | |
791 | { | |
dd5c472a SM |
792 | struct device *ret; |
793 | ||
794 | if (devices[port->number]) | |
795 | return; | |
796 | ||
797 | ret = device_create(ppdev_class, port->dev, | |
798 | MKDEV(PP_MAJOR, port->number), NULL, | |
799 | "parport%d", port->number); | |
800 | if (IS_ERR(ret)) { | |
801 | pr_err("Failed to create device parport%d\n", | |
802 | port->number); | |
803 | return; | |
804 | } | |
805 | devices[port->number] = ret; | |
1da177e4 LT |
806 | } |
807 | ||
808 | static void pp_detach(struct parport *port) | |
809 | { | |
dd5c472a SM |
810 | if (!devices[port->number]) |
811 | return; | |
812 | ||
04880eda | 813 | device_destroy(ppdev_class, MKDEV(PP_MAJOR, port->number)); |
dd5c472a | 814 | devices[port->number] = NULL; |
1da177e4 LT |
815 | } |
816 | ||
8b7d3a9d SM |
817 | static int pp_probe(struct pardevice *par_dev) |
818 | { | |
819 | struct device_driver *drv = par_dev->dev.driver; | |
820 | int len = strlen(drv->name); | |
821 | ||
822 | if (strncmp(par_dev->name, drv->name, len)) | |
823 | return -ENODEV; | |
824 | ||
825 | return 0; | |
826 | } | |
827 | ||
1da177e4 LT |
828 | static struct parport_driver pp_driver = { |
829 | .name = CHRDEV, | |
8b7d3a9d SM |
830 | .probe = pp_probe, |
831 | .match_port = pp_attach, | |
1da177e4 | 832 | .detach = pp_detach, |
8b7d3a9d | 833 | .devmodel = true, |
1da177e4 LT |
834 | }; |
835 | ||
783ea44d | 836 | static int __init ppdev_init(void) |
1da177e4 | 837 | { |
8ab5e4c1 | 838 | int err = 0; |
1da177e4 | 839 | |
783ea44d | 840 | if (register_chrdev(PP_MAJOR, CHRDEV, &pp_fops)) { |
826a4c65 | 841 | pr_warn(CHRDEV ": unable to get major %d\n", PP_MAJOR); |
1da177e4 LT |
842 | return -EIO; |
843 | } | |
ca8eca68 | 844 | ppdev_class = class_create(THIS_MODULE, CHRDEV); |
1da177e4 LT |
845 | if (IS_ERR(ppdev_class)) { |
846 | err = PTR_ERR(ppdev_class); | |
847 | goto out_chrdev; | |
848 | } | |
9a32bb39 AK |
849 | err = parport_register_driver(&pp_driver); |
850 | if (err < 0) { | |
826a4c65 | 851 | pr_warn(CHRDEV ": unable to register with parport\n"); |
1da177e4 LT |
852 | goto out_class; |
853 | } | |
854 | ||
826a4c65 | 855 | pr_info(PP_VERSION "\n"); |
1da177e4 LT |
856 | goto out; |
857 | ||
858 | out_class: | |
ca8eca68 | 859 | class_destroy(ppdev_class); |
1da177e4 LT |
860 | out_chrdev: |
861 | unregister_chrdev(PP_MAJOR, CHRDEV); | |
862 | out: | |
863 | return err; | |
864 | } | |
865 | ||
783ea44d | 866 | static void __exit ppdev_cleanup(void) |
1da177e4 | 867 | { |
1da177e4 | 868 | /* Clean up all parport stuff */ |
1da177e4 | 869 | parport_unregister_driver(&pp_driver); |
ca8eca68 | 870 | class_destroy(ppdev_class); |
783ea44d | 871 | unregister_chrdev(PP_MAJOR, CHRDEV); |
1da177e4 LT |
872 | } |
873 | ||
874 | module_init(ppdev_init); | |
875 | module_exit(ppdev_cleanup); | |
876 | ||
877 | MODULE_LICENSE("GPL"); | |
878 | MODULE_ALIAS_CHARDEV_MAJOR(PP_MAJOR); |