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