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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> | |
174cd4b1 | 61 | #include <linux/sched/signal.h> |
1da177e4 | 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; | |
9a69645d | 87 | int index; |
1da177e4 LT |
88 | }; |
89 | ||
dd5c472a SM |
90 | /* should we use PARDEVICE_MAX here? */ |
91 | static struct device *devices[PARPORT_MAX]; | |
92 | ||
9a69645d SM |
93 | static DEFINE_IDA(ida_index); |
94 | ||
1da177e4 LT |
95 | /* pp_struct.flags bitfields */ |
96 | #define PP_CLAIMED (1<<0) | |
97 | #define PP_EXCL (1<<1) | |
98 | ||
99 | /* Other constants */ | |
100 | #define PP_INTERRUPT_TIMEOUT (10 * HZ) /* 10s */ | |
101 | #define PP_BUFFER_SIZE 1024 | |
102 | #define PARDEVICE_MAX 8 | |
103 | ||
104 | /* ROUND_UP macro from fs/select.c */ | |
105 | #define ROUND_UP(x,y) (((x)+(y)-1)/(y)) | |
106 | ||
613655fa | 107 | static DEFINE_MUTEX(pp_do_mutex); |
3b9ab374 BJZ |
108 | |
109 | /* define fixed sized ioctl cmd for y2038 migration */ | |
110 | #define PPGETTIME32 _IOR(PP_IOCTL, 0x95, s32[2]) | |
111 | #define PPSETTIME32 _IOW(PP_IOCTL, 0x96, s32[2]) | |
112 | #define PPGETTIME64 _IOR(PP_IOCTL, 0x95, s64[2]) | |
113 | #define PPSETTIME64 _IOW(PP_IOCTL, 0x96, s64[2]) | |
114 | ||
783ea44d | 115 | static inline void pp_enable_irq(struct pp_struct *pp) |
1da177e4 LT |
116 | { |
117 | struct parport *port = pp->pdev->port; | |
27f3b8a3 | 118 | |
783ea44d | 119 | port->ops->enable_irq(port); |
1da177e4 LT |
120 | } |
121 | ||
d85c1a2d | 122 | static ssize_t pp_read(struct file *file, char __user *buf, size_t count, |
a7c71c07 | 123 | loff_t *ppos) |
1da177e4 | 124 | { |
496ad9aa | 125 | unsigned int minor = iminor(file_inode(file)); |
1da177e4 | 126 | struct pp_struct *pp = file->private_data; |
d85c1a2d | 127 | char *kbuffer; |
1da177e4 LT |
128 | ssize_t bytes_read = 0; |
129 | struct parport *pport; | |
130 | int mode; | |
131 | ||
132 | if (!(pp->flags & PP_CLAIMED)) { | |
133 | /* Don't have the port claimed */ | |
81fc401e | 134 | pr_debug(CHRDEV "%x: claim the port first\n", minor); |
1da177e4 LT |
135 | return -EINVAL; |
136 | } | |
137 | ||
138 | /* Trivial case. */ | |
139 | if (count == 0) | |
140 | return 0; | |
141 | ||
142 | kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL); | |
83e80605 | 143 | if (!kbuffer) |
1da177e4 | 144 | return -ENOMEM; |
1da177e4 LT |
145 | pport = pp->pdev->port; |
146 | mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR); | |
147 | ||
783ea44d | 148 | parport_set_timeout(pp->pdev, |
a7c71c07 SM |
149 | (file->f_flags & O_NONBLOCK) ? |
150 | PARPORT_INACTIVITY_O_NONBLOCK : | |
151 | pp->default_inactivity); | |
1da177e4 LT |
152 | |
153 | while (bytes_read == 0) { | |
154 | ssize_t need = min_t(unsigned long, count, PP_BUFFER_SIZE); | |
155 | ||
156 | if (mode == IEEE1284_MODE_EPP) { | |
157 | /* various specials for EPP mode */ | |
158 | int flags = 0; | |
159 | size_t (*fn)(struct parport *, void *, size_t, int); | |
160 | ||
83e80605 | 161 | if (pp->flags & PP_W91284PIC) |
1da177e4 | 162 | flags |= PARPORT_W91284PIC; |
83e80605 | 163 | if (pp->flags & PP_FASTREAD) |
1da177e4 | 164 | flags |= PARPORT_EPP_FAST; |
83e80605 | 165 | if (pport->ieee1284.mode & IEEE1284_ADDR) |
1da177e4 | 166 | fn = pport->ops->epp_read_addr; |
83e80605 | 167 | else |
1da177e4 | 168 | fn = pport->ops->epp_read_data; |
1da177e4 LT |
169 | bytes_read = (*fn)(pport, kbuffer, need, flags); |
170 | } else { | |
783ea44d | 171 | bytes_read = parport_read(pport, kbuffer, need); |
1da177e4 LT |
172 | } |
173 | ||
174 | if (bytes_read != 0) | |
175 | break; | |
176 | ||
177 | if (file->f_flags & O_NONBLOCK) { | |
178 | bytes_read = -EAGAIN; | |
179 | break; | |
180 | } | |
181 | ||
783ea44d | 182 | if (signal_pending(current)) { |
1da177e4 LT |
183 | bytes_read = -ERESTARTSYS; |
184 | break; | |
185 | } | |
186 | ||
187 | cond_resched(); | |
188 | } | |
189 | ||
783ea44d | 190 | parport_set_timeout(pp->pdev, pp->default_inactivity); |
1da177e4 | 191 | |
783ea44d | 192 | if (bytes_read > 0 && copy_to_user(buf, kbuffer, bytes_read)) |
1da177e4 LT |
193 | bytes_read = -EFAULT; |
194 | ||
783ea44d SM |
195 | kfree(kbuffer); |
196 | pp_enable_irq(pp); | |
1da177e4 LT |
197 | return bytes_read; |
198 | } | |
199 | ||
d85c1a2d | 200 | static ssize_t pp_write(struct file *file, const char __user *buf, |
a7c71c07 | 201 | size_t count, loff_t *ppos) |
1da177e4 | 202 | { |
496ad9aa | 203 | unsigned int minor = iminor(file_inode(file)); |
1da177e4 | 204 | struct pp_struct *pp = file->private_data; |
d85c1a2d | 205 | char *kbuffer; |
1da177e4 LT |
206 | ssize_t bytes_written = 0; |
207 | ssize_t wrote; | |
208 | int mode; | |
209 | struct parport *pport; | |
210 | ||
211 | if (!(pp->flags & PP_CLAIMED)) { | |
212 | /* Don't have the port claimed */ | |
81fc401e | 213 | pr_debug(CHRDEV "%x: claim the port first\n", minor); |
1da177e4 LT |
214 | return -EINVAL; |
215 | } | |
216 | ||
217 | kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL); | |
83e80605 | 218 | if (!kbuffer) |
1da177e4 | 219 | return -ENOMEM; |
83e80605 | 220 | |
1da177e4 LT |
221 | pport = pp->pdev->port; |
222 | mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR); | |
223 | ||
783ea44d | 224 | parport_set_timeout(pp->pdev, |
a7c71c07 SM |
225 | (file->f_flags & O_NONBLOCK) ? |
226 | PARPORT_INACTIVITY_O_NONBLOCK : | |
227 | pp->default_inactivity); | |
1da177e4 LT |
228 | |
229 | while (bytes_written < count) { | |
230 | ssize_t n = min_t(unsigned long, count - bytes_written, PP_BUFFER_SIZE); | |
231 | ||
783ea44d | 232 | if (copy_from_user(kbuffer, buf + bytes_written, n)) { |
1da177e4 LT |
233 | bytes_written = -EFAULT; |
234 | break; | |
235 | } | |
236 | ||
237 | if ((pp->flags & PP_FASTWRITE) && (mode == IEEE1284_MODE_EPP)) { | |
238 | /* do a fast EPP write */ | |
239 | if (pport->ieee1284.mode & IEEE1284_ADDR) { | |
783ea44d | 240 | wrote = pport->ops->epp_write_addr(pport, |
1da177e4 LT |
241 | kbuffer, n, PARPORT_EPP_FAST); |
242 | } else { | |
783ea44d | 243 | wrote = pport->ops->epp_write_data(pport, |
1da177e4 LT |
244 | kbuffer, n, PARPORT_EPP_FAST); |
245 | } | |
246 | } else { | |
783ea44d | 247 | wrote = parport_write(pp->pdev->port, kbuffer, n); |
1da177e4 LT |
248 | } |
249 | ||
250 | if (wrote <= 0) { | |
83e80605 | 251 | if (!bytes_written) |
1da177e4 | 252 | bytes_written = wrote; |
1da177e4 LT |
253 | break; |
254 | } | |
255 | ||
256 | bytes_written += wrote; | |
257 | ||
258 | if (file->f_flags & O_NONBLOCK) { | |
259 | if (!bytes_written) | |
260 | bytes_written = -EAGAIN; | |
261 | break; | |
262 | } | |
263 | ||
783ea44d | 264 | if (signal_pending(current)) |
1da177e4 | 265 | break; |
1da177e4 LT |
266 | |
267 | cond_resched(); | |
268 | } | |
269 | ||
783ea44d | 270 | parport_set_timeout(pp->pdev, pp->default_inactivity); |
1da177e4 | 271 | |
783ea44d SM |
272 | kfree(kbuffer); |
273 | pp_enable_irq(pp); | |
1da177e4 LT |
274 | return bytes_written; |
275 | } | |
276 | ||
783ea44d | 277 | static void pp_irq(void *private) |
1da177e4 | 278 | { |
5712cb3d | 279 | struct pp_struct *pp = private; |
1da177e4 LT |
280 | |
281 | if (pp->irqresponse) { | |
783ea44d | 282 | parport_write_control(pp->pdev->port, pp->irqctl); |
1da177e4 LT |
283 | pp->irqresponse = 0; |
284 | } | |
285 | ||
783ea44d SM |
286 | atomic_inc(&pp->irqc); |
287 | wake_up_interruptible(&pp->irq_wait); | |
1da177e4 LT |
288 | } |
289 | ||
783ea44d | 290 | static int register_device(int minor, struct pp_struct *pp) |
1da177e4 LT |
291 | { |
292 | struct parport *port; | |
d85c1a2d | 293 | struct pardevice *pdev = NULL; |
1da177e4 | 294 | char *name; |
8b7d3a9d | 295 | struct pardev_cb ppdev_cb; |
9a69645d | 296 | int rc = 0, index; |
1da177e4 | 297 | |
87575437 | 298 | name = kasprintf(GFP_KERNEL, CHRDEV "%x", minor); |
1da177e4 LT |
299 | if (name == NULL) |
300 | return -ENOMEM; | |
301 | ||
783ea44d | 302 | port = parport_find_number(minor); |
1da177e4 | 303 | if (!port) { |
826a4c65 | 304 | pr_warn("%s: no associated port!\n", name); |
0fa2c8eb CIK |
305 | rc = -ENXIO; |
306 | goto err; | |
1da177e4 LT |
307 | } |
308 | ||
9a69645d | 309 | index = ida_simple_get(&ida_index, 0, 0, GFP_KERNEL); |
8b7d3a9d SM |
310 | memset(&ppdev_cb, 0, sizeof(ppdev_cb)); |
311 | ppdev_cb.irq_func = pp_irq; | |
312 | ppdev_cb.flags = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0; | |
313 | ppdev_cb.private = pp; | |
9a69645d | 314 | pdev = parport_register_dev_model(port, name, &ppdev_cb, index); |
783ea44d | 315 | parport_put_port(port); |
1da177e4 LT |
316 | |
317 | if (!pdev) { | |
826a4c65 | 318 | pr_warn("%s: failed to register device!\n", name); |
0fa2c8eb | 319 | rc = -ENXIO; |
9a69645d | 320 | ida_simple_remove(&ida_index, index); |
0fa2c8eb | 321 | goto err; |
1da177e4 LT |
322 | } |
323 | ||
324 | pp->pdev = pdev; | |
9a69645d | 325 | pp->index = index; |
396ec3de | 326 | dev_dbg(&pdev->dev, "registered pardevice\n"); |
0fa2c8eb CIK |
327 | err: |
328 | kfree(name); | |
329 | return rc; | |
1da177e4 LT |
330 | } |
331 | ||
783ea44d | 332 | static enum ieee1284_phase init_phase(int mode) |
1da177e4 LT |
333 | { |
334 | switch (mode & ~(IEEE1284_DEVICEID | |
335 | | IEEE1284_ADDR)) { | |
336 | case IEEE1284_MODE_NIBBLE: | |
337 | case IEEE1284_MODE_BYTE: | |
338 | return IEEE1284_PH_REV_IDLE; | |
339 | } | |
340 | return IEEE1284_PH_FWD_IDLE; | |
341 | } | |
342 | ||
3b9ab374 BJZ |
343 | static int pp_set_timeout(struct pardevice *pdev, long tv_sec, int tv_usec) |
344 | { | |
345 | long to_jiffies; | |
346 | ||
347 | if ((tv_sec < 0) || (tv_usec < 0)) | |
348 | return -EINVAL; | |
349 | ||
350 | to_jiffies = usecs_to_jiffies(tv_usec); | |
351 | to_jiffies += tv_sec * HZ; | |
352 | if (to_jiffies <= 0) | |
353 | return -EINVAL; | |
354 | ||
355 | pdev->timeout = to_jiffies; | |
356 | return 0; | |
357 | } | |
358 | ||
6d535d3e | 359 | static int pp_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1da177e4 | 360 | { |
496ad9aa | 361 | unsigned int minor = iminor(file_inode(file)); |
1da177e4 | 362 | struct pp_struct *pp = file->private_data; |
d85c1a2d | 363 | struct parport *port; |
1da177e4 LT |
364 | void __user *argp = (void __user *)arg; |
365 | ||
366 | /* First handle the cases that don't take arguments. */ | |
367 | switch (cmd) { | |
368 | case PPCLAIM: | |
369 | { | |
370 | struct ieee1284_info *info; | |
371 | int ret; | |
372 | ||
373 | if (pp->flags & PP_CLAIMED) { | |
396ec3de | 374 | dev_dbg(&pp->pdev->dev, "you've already got it!\n"); |
1da177e4 LT |
375 | return -EINVAL; |
376 | } | |
377 | ||
378 | /* Deferred device registration. */ | |
379 | if (!pp->pdev) { | |
783ea44d | 380 | int err = register_device(minor, pp); |
27f3b8a3 | 381 | |
83e80605 | 382 | if (err) |
1da177e4 | 383 | return err; |
1da177e4 LT |
384 | } |
385 | ||
783ea44d | 386 | ret = parport_claim_or_block(pp->pdev); |
1da177e4 LT |
387 | if (ret < 0) |
388 | return ret; | |
389 | ||
390 | pp->flags |= PP_CLAIMED; | |
391 | ||
392 | /* For interrupt-reporting to work, we need to be | |
393 | * informed of each interrupt. */ | |
783ea44d | 394 | pp_enable_irq(pp); |
1da177e4 LT |
395 | |
396 | /* We may need to fix up the state machine. */ | |
397 | info = &pp->pdev->port->ieee1284; | |
398 | pp->saved_state.mode = info->mode; | |
399 | pp->saved_state.phase = info->phase; | |
400 | info->mode = pp->state.mode; | |
401 | info->phase = pp->state.phase; | |
783ea44d SM |
402 | pp->default_inactivity = parport_set_timeout(pp->pdev, 0); |
403 | parport_set_timeout(pp->pdev, pp->default_inactivity); | |
1da177e4 LT |
404 | |
405 | return 0; | |
406 | } | |
407 | case PPEXCL: | |
408 | if (pp->pdev) { | |
396ec3de SM |
409 | dev_dbg(&pp->pdev->dev, |
410 | "too late for PPEXCL; already registered\n"); | |
1da177e4 LT |
411 | if (pp->flags & PP_EXCL) |
412 | /* But it's not really an error. */ | |
413 | return 0; | |
414 | /* There's no chance of making the driver happy. */ | |
415 | return -EINVAL; | |
416 | } | |
417 | ||
418 | /* Just remember to register the device exclusively | |
419 | * when we finally do the registration. */ | |
420 | pp->flags |= PP_EXCL; | |
421 | return 0; | |
422 | case PPSETMODE: | |
423 | { | |
424 | int mode; | |
27f3b8a3 | 425 | |
783ea44d | 426 | if (copy_from_user(&mode, argp, sizeof(mode))) |
1da177e4 LT |
427 | return -EFAULT; |
428 | /* FIXME: validate mode */ | |
429 | pp->state.mode = mode; | |
783ea44d | 430 | pp->state.phase = init_phase(mode); |
1da177e4 LT |
431 | |
432 | if (pp->flags & PP_CLAIMED) { | |
433 | pp->pdev->port->ieee1284.mode = mode; | |
434 | pp->pdev->port->ieee1284.phase = pp->state.phase; | |
435 | } | |
436 | ||
437 | return 0; | |
438 | } | |
439 | case PPGETMODE: | |
440 | { | |
441 | int mode; | |
442 | ||
83e80605 | 443 | if (pp->flags & PP_CLAIMED) |
1da177e4 | 444 | mode = pp->pdev->port->ieee1284.mode; |
83e80605 | 445 | else |
1da177e4 | 446 | mode = pp->state.mode; |
83e80605 SM |
447 | |
448 | if (copy_to_user(argp, &mode, sizeof(mode))) | |
1da177e4 | 449 | return -EFAULT; |
1da177e4 LT |
450 | return 0; |
451 | } | |
452 | case PPSETPHASE: | |
453 | { | |
454 | int phase; | |
27f3b8a3 | 455 | |
83e80605 | 456 | if (copy_from_user(&phase, argp, sizeof(phase))) |
1da177e4 | 457 | return -EFAULT; |
83e80605 | 458 | |
1da177e4 LT |
459 | /* FIXME: validate phase */ |
460 | pp->state.phase = phase; | |
461 | ||
83e80605 | 462 | if (pp->flags & PP_CLAIMED) |
1da177e4 | 463 | pp->pdev->port->ieee1284.phase = phase; |
1da177e4 LT |
464 | |
465 | return 0; | |
466 | } | |
467 | case PPGETPHASE: | |
468 | { | |
469 | int phase; | |
470 | ||
83e80605 | 471 | if (pp->flags & PP_CLAIMED) |
1da177e4 | 472 | phase = pp->pdev->port->ieee1284.phase; |
83e80605 | 473 | else |
1da177e4 | 474 | phase = pp->state.phase; |
83e80605 | 475 | if (copy_to_user(argp, &phase, sizeof(phase))) |
1da177e4 | 476 | return -EFAULT; |
1da177e4 LT |
477 | return 0; |
478 | } | |
479 | case PPGETMODES: | |
480 | { | |
481 | unsigned int modes; | |
482 | ||
783ea44d | 483 | port = parport_find_number(minor); |
1da177e4 LT |
484 | if (!port) |
485 | return -ENODEV; | |
486 | ||
487 | modes = port->modes; | |
d98808a2 | 488 | parport_put_port(port); |
83e80605 | 489 | if (copy_to_user(argp, &modes, sizeof(modes))) |
1da177e4 | 490 | return -EFAULT; |
1da177e4 LT |
491 | return 0; |
492 | } | |
493 | case PPSETFLAGS: | |
494 | { | |
495 | int uflags; | |
496 | ||
83e80605 | 497 | if (copy_from_user(&uflags, argp, sizeof(uflags))) |
1da177e4 | 498 | return -EFAULT; |
1da177e4 LT |
499 | pp->flags &= ~PP_FLAGMASK; |
500 | pp->flags |= (uflags & PP_FLAGMASK); | |
501 | return 0; | |
502 | } | |
503 | case PPGETFLAGS: | |
504 | { | |
505 | int uflags; | |
506 | ||
507 | uflags = pp->flags & PP_FLAGMASK; | |
83e80605 | 508 | if (copy_to_user(argp, &uflags, sizeof(uflags))) |
1da177e4 | 509 | return -EFAULT; |
1da177e4 LT |
510 | return 0; |
511 | } | |
512 | } /* end switch() */ | |
513 | ||
514 | /* Everything else requires the port to be claimed, so check | |
515 | * that now. */ | |
516 | if ((pp->flags & PP_CLAIMED) == 0) { | |
81fc401e | 517 | pr_debug(CHRDEV "%x: claim the port first\n", minor); |
1da177e4 LT |
518 | return -EINVAL; |
519 | } | |
520 | ||
521 | port = pp->pdev->port; | |
522 | switch (cmd) { | |
523 | struct ieee1284_info *info; | |
524 | unsigned char reg; | |
525 | unsigned char mask; | |
526 | int mode; | |
3b9ab374 BJZ |
527 | s32 time32[2]; |
528 | s64 time64[2]; | |
529 | struct timespec64 ts; | |
1da177e4 | 530 | int ret; |
1da177e4 LT |
531 | |
532 | case PPRSTATUS: | |
783ea44d SM |
533 | reg = parport_read_status(port); |
534 | if (copy_to_user(argp, ®, sizeof(reg))) | |
1da177e4 LT |
535 | return -EFAULT; |
536 | return 0; | |
537 | case PPRDATA: | |
783ea44d SM |
538 | reg = parport_read_data(port); |
539 | if (copy_to_user(argp, ®, sizeof(reg))) | |
1da177e4 LT |
540 | return -EFAULT; |
541 | return 0; | |
542 | case PPRCONTROL: | |
783ea44d SM |
543 | reg = parport_read_control(port); |
544 | if (copy_to_user(argp, ®, sizeof(reg))) | |
1da177e4 LT |
545 | return -EFAULT; |
546 | return 0; | |
547 | case PPYIELD: | |
783ea44d | 548 | parport_yield_blocking(pp->pdev); |
1da177e4 LT |
549 | return 0; |
550 | ||
551 | case PPRELEASE: | |
552 | /* Save the state machine's state. */ | |
553 | info = &pp->pdev->port->ieee1284; | |
554 | pp->state.mode = info->mode; | |
555 | pp->state.phase = info->phase; | |
556 | info->mode = pp->saved_state.mode; | |
557 | info->phase = pp->saved_state.phase; | |
783ea44d | 558 | parport_release(pp->pdev); |
1da177e4 LT |
559 | pp->flags &= ~PP_CLAIMED; |
560 | return 0; | |
561 | ||
562 | case PPWCONTROL: | |
783ea44d | 563 | if (copy_from_user(®, argp, sizeof(reg))) |
1da177e4 | 564 | return -EFAULT; |
783ea44d | 565 | parport_write_control(port, reg); |
1da177e4 LT |
566 | return 0; |
567 | ||
568 | case PPWDATA: | |
783ea44d | 569 | if (copy_from_user(®, argp, sizeof(reg))) |
1da177e4 | 570 | return -EFAULT; |
783ea44d | 571 | parport_write_data(port, reg); |
1da177e4 LT |
572 | return 0; |
573 | ||
574 | case PPFCONTROL: | |
783ea44d | 575 | if (copy_from_user(&mask, argp, |
a7c71c07 | 576 | sizeof(mask))) |
1da177e4 | 577 | return -EFAULT; |
783ea44d | 578 | if (copy_from_user(®, 1 + (unsigned char __user *) arg, |
a7c71c07 | 579 | sizeof(reg))) |
1da177e4 | 580 | return -EFAULT; |
783ea44d | 581 | parport_frob_control(port, mask, reg); |
1da177e4 LT |
582 | return 0; |
583 | ||
584 | case PPDATADIR: | |
783ea44d | 585 | if (copy_from_user(&mode, argp, sizeof(mode))) |
1da177e4 LT |
586 | return -EFAULT; |
587 | if (mode) | |
783ea44d | 588 | port->ops->data_reverse(port); |
1da177e4 | 589 | else |
783ea44d | 590 | port->ops->data_forward(port); |
1da177e4 LT |
591 | return 0; |
592 | ||
593 | case PPNEGOT: | |
783ea44d | 594 | if (copy_from_user(&mode, argp, sizeof(mode))) |
1da177e4 | 595 | return -EFAULT; |
783ea44d | 596 | switch ((ret = parport_negotiate(port, mode))) { |
1da177e4 LT |
597 | case 0: break; |
598 | case -1: /* handshake failed, peripheral not IEEE 1284 */ | |
599 | ret = -EIO; | |
600 | break; | |
601 | case 1: /* handshake succeeded, peripheral rejected mode */ | |
602 | ret = -ENXIO; | |
603 | break; | |
604 | } | |
783ea44d | 605 | pp_enable_irq(pp); |
1da177e4 LT |
606 | return ret; |
607 | ||
608 | case PPWCTLONIRQ: | |
783ea44d | 609 | if (copy_from_user(®, argp, sizeof(reg))) |
1da177e4 LT |
610 | return -EFAULT; |
611 | ||
612 | /* Remember what to set the control lines to, for next | |
613 | * time we get an interrupt. */ | |
614 | pp->irqctl = reg; | |
615 | pp->irqresponse = 1; | |
616 | return 0; | |
617 | ||
618 | case PPCLRIRQ: | |
783ea44d SM |
619 | ret = atomic_read(&pp->irqc); |
620 | if (copy_to_user(argp, &ret, sizeof(ret))) | |
1da177e4 | 621 | return -EFAULT; |
783ea44d | 622 | atomic_sub(ret, &pp->irqc); |
1da177e4 LT |
623 | return 0; |
624 | ||
3b9ab374 BJZ |
625 | case PPSETTIME32: |
626 | if (copy_from_user(time32, argp, sizeof(time32))) | |
1da177e4 | 627 | return -EFAULT; |
3b9ab374 BJZ |
628 | |
629 | return pp_set_timeout(pp->pdev, time32[0], time32[1]); | |
630 | ||
631 | case PPSETTIME64: | |
632 | if (copy_from_user(time64, argp, sizeof(time64))) | |
633 | return -EFAULT; | |
634 | ||
635 | return pp_set_timeout(pp->pdev, time64[0], time64[1]); | |
636 | ||
637 | case PPGETTIME32: | |
638 | jiffies_to_timespec64(pp->pdev->timeout, &ts); | |
639 | time32[0] = ts.tv_sec; | |
640 | time32[1] = ts.tv_nsec / NSEC_PER_USEC; | |
641 | if ((time32[0] < 0) || (time32[1] < 0)) | |
1da177e4 | 642 | return -EINVAL; |
3b9ab374 BJZ |
643 | |
644 | if (copy_to_user(argp, time32, sizeof(time32))) | |
645 | return -EFAULT; | |
646 | ||
1da177e4 LT |
647 | return 0; |
648 | ||
3b9ab374 BJZ |
649 | case PPGETTIME64: |
650 | jiffies_to_timespec64(pp->pdev->timeout, &ts); | |
651 | time64[0] = ts.tv_sec; | |
652 | time64[1] = ts.tv_nsec / NSEC_PER_USEC; | |
653 | if ((time64[0] < 0) || (time64[1] < 0)) | |
654 | return -EINVAL; | |
655 | ||
656 | if (copy_to_user(argp, time64, sizeof(time64))) | |
1da177e4 | 657 | return -EFAULT; |
3b9ab374 | 658 | |
1da177e4 LT |
659 | return 0; |
660 | ||
661 | default: | |
396ec3de | 662 | dev_dbg(&pp->pdev->dev, "What? (cmd=0x%x)\n", cmd); |
1da177e4 LT |
663 | return -EINVAL; |
664 | } | |
665 | ||
666 | /* Keep the compiler happy */ | |
667 | return 0; | |
668 | } | |
669 | ||
6d535d3e AC |
670 | static long pp_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
671 | { | |
672 | long ret; | |
27f3b8a3 | 673 | |
613655fa | 674 | mutex_lock(&pp_do_mutex); |
6d535d3e | 675 | ret = pp_do_ioctl(file, cmd, arg); |
613655fa | 676 | mutex_unlock(&pp_do_mutex); |
6d535d3e AC |
677 | return ret; |
678 | } | |
679 | ||
17a3596f BJZ |
680 | #ifdef CONFIG_COMPAT |
681 | static long pp_compat_ioctl(struct file *file, unsigned int cmd, | |
a7c71c07 | 682 | unsigned long arg) |
17a3596f BJZ |
683 | { |
684 | return pp_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); | |
685 | } | |
686 | #endif | |
687 | ||
d85c1a2d | 688 | static int pp_open(struct inode *inode, struct file *file) |
1da177e4 LT |
689 | { |
690 | unsigned int minor = iminor(inode); | |
691 | struct pp_struct *pp; | |
692 | ||
693 | if (minor >= PARPORT_MAX) | |
694 | return -ENXIO; | |
695 | ||
783ea44d | 696 | pp = kmalloc(sizeof(struct pp_struct), GFP_KERNEL); |
1da177e4 LT |
697 | if (!pp) |
698 | return -ENOMEM; | |
699 | ||
700 | pp->state.mode = IEEE1284_MODE_COMPAT; | |
783ea44d | 701 | pp->state.phase = init_phase(pp->state.mode); |
1da177e4 LT |
702 | pp->flags = 0; |
703 | pp->irqresponse = 0; | |
783ea44d SM |
704 | atomic_set(&pp->irqc, 0); |
705 | init_waitqueue_head(&pp->irq_wait); | |
1da177e4 LT |
706 | |
707 | /* Defer the actual device registration until the first claim. | |
708 | * That way, we know whether or not the driver wants to have | |
709 | * exclusive access to the port (PPEXCL). | |
710 | */ | |
711 | pp->pdev = NULL; | |
712 | file->private_data = pp; | |
713 | ||
714 | return 0; | |
715 | } | |
716 | ||
d85c1a2d | 717 | static int pp_release(struct inode *inode, struct file *file) |
1da177e4 LT |
718 | { |
719 | unsigned int minor = iminor(inode); | |
720 | struct pp_struct *pp = file->private_data; | |
721 | int compat_negot; | |
722 | ||
723 | compat_negot = 0; | |
724 | if (!(pp->flags & PP_CLAIMED) && pp->pdev && | |
725 | (pp->state.mode != IEEE1284_MODE_COMPAT)) { | |
3c8db584 | 726 | struct ieee1284_info *info; |
1da177e4 LT |
727 | |
728 | /* parport released, but not in compatibility mode */ | |
783ea44d | 729 | parport_claim_or_block(pp->pdev); |
1da177e4 LT |
730 | pp->flags |= PP_CLAIMED; |
731 | info = &pp->pdev->port->ieee1284; | |
732 | pp->saved_state.mode = info->mode; | |
733 | pp->saved_state.phase = info->phase; | |
734 | info->mode = pp->state.mode; | |
735 | info->phase = pp->state.phase; | |
736 | compat_negot = 1; | |
737 | } else if ((pp->flags & PP_CLAIMED) && pp->pdev && | |
738 | (pp->pdev->port->ieee1284.mode != IEEE1284_MODE_COMPAT)) { | |
739 | compat_negot = 2; | |
740 | } | |
741 | if (compat_negot) { | |
783ea44d | 742 | parport_negotiate(pp->pdev->port, IEEE1284_MODE_COMPAT); |
396ec3de SM |
743 | dev_dbg(&pp->pdev->dev, |
744 | "negotiated back to compatibility mode because user-space forgot\n"); | |
1da177e4 LT |
745 | } |
746 | ||
747 | if (pp->flags & PP_CLAIMED) { | |
748 | struct ieee1284_info *info; | |
749 | ||
750 | info = &pp->pdev->port->ieee1284; | |
751 | pp->state.mode = info->mode; | |
752 | pp->state.phase = info->phase; | |
753 | info->mode = pp->saved_state.mode; | |
754 | info->phase = pp->saved_state.phase; | |
783ea44d | 755 | parport_release(pp->pdev); |
1da177e4 | 756 | if (compat_negot != 1) { |
81fc401e | 757 | pr_debug(CHRDEV "%x: released pardevice " |
1da177e4 LT |
758 | "because user-space forgot\n", minor); |
759 | } | |
760 | } | |
761 | ||
762 | if (pp->pdev) { | |
783ea44d | 763 | parport_unregister_device(pp->pdev); |
9a69645d | 764 | ida_simple_remove(&ida_index, pp->index); |
1da177e4 | 765 | pp->pdev = NULL; |
81fc401e | 766 | pr_debug(CHRDEV "%x: unregistered pardevice\n", minor); |
1da177e4 LT |
767 | } |
768 | ||
783ea44d | 769 | kfree(pp); |
1da177e4 LT |
770 | |
771 | return 0; | |
772 | } | |
773 | ||
774 | /* No kernel lock held - fine */ | |
d85c1a2d | 775 | static unsigned int pp_poll(struct file *file, poll_table *wait) |
1da177e4 LT |
776 | { |
777 | struct pp_struct *pp = file->private_data; | |
778 | unsigned int mask = 0; | |
779 | ||
783ea44d SM |
780 | poll_wait(file, &pp->irq_wait, wait); |
781 | if (atomic_read(&pp->irqc)) | |
1da177e4 LT |
782 | mask |= POLLIN | POLLRDNORM; |
783 | ||
784 | return mask; | |
785 | } | |
786 | ||
ca8eca68 | 787 | static struct class *ppdev_class; |
1da177e4 | 788 | |
62322d25 | 789 | static const struct file_operations pp_fops = { |
1da177e4 LT |
790 | .owner = THIS_MODULE, |
791 | .llseek = no_llseek, | |
792 | .read = pp_read, | |
793 | .write = pp_write, | |
794 | .poll = pp_poll, | |
6d535d3e | 795 | .unlocked_ioctl = pp_ioctl, |
17a3596f BJZ |
796 | #ifdef CONFIG_COMPAT |
797 | .compat_ioctl = pp_compat_ioctl, | |
798 | #endif | |
1da177e4 LT |
799 | .open = pp_open, |
800 | .release = pp_release, | |
801 | }; | |
802 | ||
803 | static void pp_attach(struct parport *port) | |
804 | { | |
dd5c472a SM |
805 | struct device *ret; |
806 | ||
807 | if (devices[port->number]) | |
808 | return; | |
809 | ||
810 | ret = device_create(ppdev_class, port->dev, | |
811 | MKDEV(PP_MAJOR, port->number), NULL, | |
812 | "parport%d", port->number); | |
813 | if (IS_ERR(ret)) { | |
814 | pr_err("Failed to create device parport%d\n", | |
815 | port->number); | |
816 | return; | |
817 | } | |
818 | devices[port->number] = ret; | |
1da177e4 LT |
819 | } |
820 | ||
821 | static void pp_detach(struct parport *port) | |
822 | { | |
dd5c472a SM |
823 | if (!devices[port->number]) |
824 | return; | |
825 | ||
04880eda | 826 | device_destroy(ppdev_class, MKDEV(PP_MAJOR, port->number)); |
dd5c472a | 827 | devices[port->number] = NULL; |
1da177e4 LT |
828 | } |
829 | ||
8b7d3a9d SM |
830 | static int pp_probe(struct pardevice *par_dev) |
831 | { | |
832 | struct device_driver *drv = par_dev->dev.driver; | |
833 | int len = strlen(drv->name); | |
834 | ||
835 | if (strncmp(par_dev->name, drv->name, len)) | |
836 | return -ENODEV; | |
837 | ||
838 | return 0; | |
839 | } | |
840 | ||
1da177e4 LT |
841 | static struct parport_driver pp_driver = { |
842 | .name = CHRDEV, | |
8b7d3a9d SM |
843 | .probe = pp_probe, |
844 | .match_port = pp_attach, | |
1da177e4 | 845 | .detach = pp_detach, |
8b7d3a9d | 846 | .devmodel = true, |
1da177e4 LT |
847 | }; |
848 | ||
783ea44d | 849 | static int __init ppdev_init(void) |
1da177e4 | 850 | { |
8ab5e4c1 | 851 | int err = 0; |
1da177e4 | 852 | |
783ea44d | 853 | if (register_chrdev(PP_MAJOR, CHRDEV, &pp_fops)) { |
826a4c65 | 854 | pr_warn(CHRDEV ": unable to get major %d\n", PP_MAJOR); |
1da177e4 LT |
855 | return -EIO; |
856 | } | |
ca8eca68 | 857 | ppdev_class = class_create(THIS_MODULE, CHRDEV); |
1da177e4 LT |
858 | if (IS_ERR(ppdev_class)) { |
859 | err = PTR_ERR(ppdev_class); | |
860 | goto out_chrdev; | |
861 | } | |
9a32bb39 AK |
862 | err = parport_register_driver(&pp_driver); |
863 | if (err < 0) { | |
826a4c65 | 864 | pr_warn(CHRDEV ": unable to register with parport\n"); |
1da177e4 LT |
865 | goto out_class; |
866 | } | |
867 | ||
826a4c65 | 868 | pr_info(PP_VERSION "\n"); |
1da177e4 LT |
869 | goto out; |
870 | ||
871 | out_class: | |
ca8eca68 | 872 | class_destroy(ppdev_class); |
1da177e4 LT |
873 | out_chrdev: |
874 | unregister_chrdev(PP_MAJOR, CHRDEV); | |
875 | out: | |
876 | return err; | |
877 | } | |
878 | ||
783ea44d | 879 | static void __exit ppdev_cleanup(void) |
1da177e4 | 880 | { |
1da177e4 | 881 | /* Clean up all parport stuff */ |
1da177e4 | 882 | parport_unregister_driver(&pp_driver); |
ca8eca68 | 883 | class_destroy(ppdev_class); |
783ea44d | 884 | unregister_chrdev(PP_MAJOR, CHRDEV); |
1da177e4 LT |
885 | } |
886 | ||
887 | module_init(ppdev_init); | |
888 | module_exit(ppdev_cleanup); | |
889 | ||
890 | MODULE_LICENSE("GPL"); | |
891 | MODULE_ALIAS_CHARDEV_MAJOR(PP_MAJOR); |