parport: remove superfluous local variable
[linux-2.6.git] / drivers / parport / procfs.c
1 /* Sysctl interface for parport devices.
2  * 
3  * Authors: David Campbell
4  *          Tim Waugh <tim@cyberelk.demon.co.uk>
5  *          Philip Blundell <philb@gnu.org>
6  *          Andrea Arcangeli
7  *          Riccardo Facchetti <fizban@tin.it>
8  *
9  * based on work by Grant Guenther <grant@torque.net>
10  *              and Philip Blundell
11  *
12  * Cleaned up include files - Russell King <linux@arm.uk.linux.org>
13  */
14
15 #include <linux/string.h>
16 #include <linux/init.h>
17 #include <linux/module.h>
18 #include <linux/errno.h>
19 #include <linux/kernel.h>
20 #include <linux/slab.h>
21 #include <linux/parport.h>
22 #include <linux/ctype.h>
23 #include <linux/sysctl.h>
24
25 #include <asm/uaccess.h>
26
27 #if defined(CONFIG_SYSCTL) && defined(CONFIG_PROC_FS)
28
29 #define PARPORT_MIN_TIMESLICE_VALUE 1ul 
30 #define PARPORT_MAX_TIMESLICE_VALUE ((unsigned long) HZ)
31 #define PARPORT_MIN_SPINTIME_VALUE 1
32 #define PARPORT_MAX_SPINTIME_VALUE 1000
33
34 static int do_active_device(ctl_table *table, int write, struct file *filp,
35                       void __user *result, size_t *lenp, loff_t *ppos)
36 {
37         struct parport *port = (struct parport *)table->extra1;
38         char buffer[256];
39         struct pardevice *dev;
40         int len = 0;
41
42         if (write)              /* can't happen anyway */
43                 return -EACCES;
44
45         if (*ppos) {
46                 *lenp = 0;
47                 return 0;
48         }
49         
50         for (dev = port->devices; dev ; dev = dev->next) {
51                 if(dev == port->cad) {
52                         len += sprintf(buffer, "%s\n", dev->name);
53                 }
54         }
55
56         if(!len) {
57                 len += sprintf(buffer, "%s\n", "none");
58         }
59
60         if (len > *lenp)
61                 len = *lenp;
62         else
63                 *lenp = len;
64
65         *ppos += len;
66
67         return copy_to_user(result, buffer, len) ? -EFAULT : 0;
68 }
69
70 #ifdef CONFIG_PARPORT_1284
71 static int do_autoprobe(ctl_table *table, int write, struct file *filp,
72                         void __user *result, size_t *lenp, loff_t *ppos)
73 {
74         struct parport_device_info *info = table->extra2;
75         const char *str;
76         char buffer[256];
77         int len = 0;
78
79         if (write) /* permissions stop this */
80                 return -EACCES;
81
82         if (*ppos) {
83                 *lenp = 0;
84                 return 0;
85         }
86         
87         if ((str = info->class_name) != NULL)
88                 len += sprintf (buffer + len, "CLASS:%s;\n", str);
89
90         if ((str = info->model) != NULL)
91                 len += sprintf (buffer + len, "MODEL:%s;\n", str);
92
93         if ((str = info->mfr) != NULL)
94                 len += sprintf (buffer + len, "MANUFACTURER:%s;\n", str);
95
96         if ((str = info->description) != NULL)
97                 len += sprintf (buffer + len, "DESCRIPTION:%s;\n", str);
98
99         if ((str = info->cmdset) != NULL)
100                 len += sprintf (buffer + len, "COMMAND SET:%s;\n", str);
101
102         if (len > *lenp)
103                 len = *lenp;
104         else
105                 *lenp = len;
106
107         *ppos += len;
108
109         return copy_to_user (result, buffer, len) ? -EFAULT : 0;
110 }
111 #endif /* IEEE1284.3 support. */
112
113 static int do_hardware_base_addr (ctl_table *table, int write,
114                                   struct file *filp, void __user *result,
115                                   size_t *lenp, loff_t *ppos)
116 {
117         struct parport *port = (struct parport *)table->extra1;
118         char buffer[20];
119         int len = 0;
120
121         if (*ppos) {
122                 *lenp = 0;
123                 return 0;
124         }
125
126         if (write) /* permissions prevent this anyway */
127                 return -EACCES;
128
129         len += sprintf (buffer, "%lu\t%lu\n", port->base, port->base_hi);
130
131         if (len > *lenp)
132                 len = *lenp;
133         else
134                 *lenp = len;
135
136         *ppos += len;
137
138         return copy_to_user(result, buffer, len) ? -EFAULT : 0;
139 }
140
141 static int do_hardware_irq (ctl_table *table, int write,
142                             struct file *filp, void __user *result,
143                             size_t *lenp, loff_t *ppos)
144 {
145         struct parport *port = (struct parport *)table->extra1;
146         char buffer[20];
147         int len = 0;
148
149         if (*ppos) {
150                 *lenp = 0;
151                 return 0;
152         }
153
154         if (write) /* permissions prevent this anyway */
155                 return -EACCES;
156
157         len += sprintf (buffer, "%d\n", port->irq);
158
159         if (len > *lenp)
160                 len = *lenp;
161         else
162                 *lenp = len;
163
164         *ppos += len;
165
166         return copy_to_user(result, buffer, len) ? -EFAULT : 0;
167 }
168
169 static int do_hardware_dma (ctl_table *table, int write,
170                             struct file *filp, void __user *result,
171                             size_t *lenp, loff_t *ppos)
172 {
173         struct parport *port = (struct parport *)table->extra1;
174         char buffer[20];
175         int len = 0;
176
177         if (*ppos) {
178                 *lenp = 0;
179                 return 0;
180         }
181
182         if (write) /* permissions prevent this anyway */
183                 return -EACCES;
184
185         len += sprintf (buffer, "%d\n", port->dma);
186
187         if (len > *lenp)
188                 len = *lenp;
189         else
190                 *lenp = len;
191
192         *ppos += len;
193
194         return copy_to_user(result, buffer, len) ? -EFAULT : 0;
195 }
196
197 static int do_hardware_modes (ctl_table *table, int write,
198                               struct file *filp, void __user *result,
199                               size_t *lenp, loff_t *ppos)
200 {
201         struct parport *port = (struct parport *)table->extra1;
202         char buffer[40];
203         int len = 0;
204
205         if (*ppos) {
206                 *lenp = 0;
207                 return 0;
208         }
209
210         if (write) /* permissions prevent this anyway */
211                 return -EACCES;
212
213         {
214 #define printmode(x) {if(port->modes&PARPORT_MODE_##x){len+=sprintf(buffer+len,"%s%s",f?",":"",#x);f++;}}
215                 int f = 0;
216                 printmode(PCSPP);
217                 printmode(TRISTATE);
218                 printmode(COMPAT);
219                 printmode(EPP);
220                 printmode(ECP);
221                 printmode(DMA);
222 #undef printmode
223         }
224         buffer[len++] = '\n';
225
226         if (len > *lenp)
227                 len = *lenp;
228         else
229                 *lenp = len;
230
231         *ppos += len;
232
233         return copy_to_user(result, buffer, len) ? -EFAULT : 0;
234 }
235
236 #define PARPORT_PORT_DIR(CHILD) { .ctl_name = 0, .procname = NULL, .mode = 0555, .child = CHILD }
237 #define PARPORT_PARPORT_DIR(CHILD) { .ctl_name = DEV_PARPORT, .procname = "parport", \
238                                      .mode = 0555, .child = CHILD }
239 #define PARPORT_DEV_DIR(CHILD) { .ctl_name = CTL_DEV, .procname = "dev", .mode = 0555, .child = CHILD }
240 #define PARPORT_DEVICES_ROOT_DIR  {  .procname = "devices", \
241                                     .mode = 0555, .child = NULL }
242
243 static const unsigned long parport_min_timeslice_value =
244 PARPORT_MIN_TIMESLICE_VALUE;
245
246 static const unsigned long parport_max_timeslice_value =
247 PARPORT_MAX_TIMESLICE_VALUE;
248
249 static const  int parport_min_spintime_value =
250 PARPORT_MIN_SPINTIME_VALUE;
251
252 static const int parport_max_spintime_value =
253 PARPORT_MAX_SPINTIME_VALUE;
254
255
256 struct parport_sysctl_table {
257         struct ctl_table_header *sysctl_header;
258         ctl_table vars[12];
259         ctl_table device_dir[2];
260         ctl_table port_dir[2];
261         ctl_table parport_dir[2];
262         ctl_table dev_dir[2];
263 };
264
265 static const struct parport_sysctl_table parport_sysctl_template = {
266         .sysctl_header = NULL,
267         {
268                 {
269                         .procname       = "spintime",
270                         .data           = NULL,
271                         .maxlen         = sizeof(int),
272                         .mode           = 0644,
273                         .proc_handler   = &proc_dointvec_minmax,
274                         .extra1         = (void*) &parport_min_spintime_value,
275                         .extra2         = (void*) &parport_max_spintime_value
276                 },
277                 {
278                         .procname       = "base-addr",
279                         .data           = NULL,
280                         .maxlen         = 0,
281                         .mode           = 0444,
282                         .proc_handler   = &do_hardware_base_addr
283                 },
284                 {
285                         .procname       = "irq",
286                         .data           = NULL,
287                         .maxlen         = 0,
288                         .mode           = 0444,
289                         .proc_handler   = &do_hardware_irq
290                 },
291                 {
292                         .procname       = "dma",
293                         .data           = NULL,
294                         .maxlen         = 0,
295                         .mode           = 0444,
296                         .proc_handler   = &do_hardware_dma
297                 },
298                 {
299                         .procname       = "modes",
300                         .data           = NULL,
301                         .maxlen         = 0,
302                         .mode           = 0444,
303                         .proc_handler   = &do_hardware_modes
304                 },
305                 PARPORT_DEVICES_ROOT_DIR,
306 #ifdef CONFIG_PARPORT_1284
307                 {
308                         .procname       = "autoprobe",
309                         .data           = NULL,
310                         .maxlen         = 0,
311                         .mode           = 0444,
312                         .proc_handler   = &do_autoprobe
313                 },
314                 {
315                         .procname       = "autoprobe0",
316                         .data           = NULL,
317                         .maxlen         = 0,
318                         .mode           = 0444,
319                         .proc_handler   =  &do_autoprobe
320                 },
321                 {
322                         .procname       = "autoprobe1",
323                         .data           = NULL,
324                         .maxlen         = 0,
325                         .mode           = 0444,
326                         .proc_handler   = &do_autoprobe
327                 },
328                 {
329                         .procname       = "autoprobe2",
330                         .data           = NULL,
331                         .maxlen         = 0,
332                         .mode           = 0444,
333                         .proc_handler   = &do_autoprobe
334                 },
335                 {
336                         .procname       = "autoprobe3",
337                         .data           = NULL,
338                         .maxlen         = 0,
339                         .mode           = 0444,
340                         .proc_handler   = &do_autoprobe
341                 },
342 #endif /* IEEE 1284 support */
343                 {}
344         },
345         {
346                 {
347                         .procname       = "active",
348                         .data           = NULL,
349                         .maxlen         = 0,
350                         .mode           = 0444,
351                         .proc_handler   = &do_active_device
352                 },
353                 {}
354         },
355         {
356                 PARPORT_PORT_DIR(NULL),
357                 {}
358         },
359         {
360                 PARPORT_PARPORT_DIR(NULL),
361                 {}
362         },
363         {
364                 PARPORT_DEV_DIR(NULL),
365                 {}
366         }
367 };
368
369 struct parport_device_sysctl_table
370 {
371         struct ctl_table_header *sysctl_header;
372         ctl_table vars[2];
373         ctl_table device_dir[2];
374         ctl_table devices_root_dir[2];
375         ctl_table port_dir[2];
376         ctl_table parport_dir[2];
377         ctl_table dev_dir[2];
378 };
379
380 static const struct parport_device_sysctl_table
381 parport_device_sysctl_template = {
382         .sysctl_header = NULL,
383         {
384                 {
385                         .procname       = "timeslice",
386                         .data           = NULL,
387                         .maxlen         = sizeof(unsigned long),
388                         .mode           = 0644,
389                         .proc_handler   = &proc_doulongvec_ms_jiffies_minmax,
390                         .extra1         = (void*) &parport_min_timeslice_value,
391                         .extra2         = (void*) &parport_max_timeslice_value
392                 },
393         },
394         {
395                 {
396                         .ctl_name       = 0,
397                         .procname       = NULL,
398                         .data           = NULL,
399                         .maxlen         = 0,
400                         .mode           = 0555,
401                         .child          = NULL
402                 },
403                 {}
404         },
405         {
406                 PARPORT_DEVICES_ROOT_DIR,
407                 {}
408         },
409         {
410                 PARPORT_PORT_DIR(NULL),
411                 {}
412         },
413         {
414                 PARPORT_PARPORT_DIR(NULL),
415                 {}
416         },
417         {
418                 PARPORT_DEV_DIR(NULL),
419                 {}
420         }
421 };
422
423 struct parport_default_sysctl_table
424 {
425         struct ctl_table_header *sysctl_header;
426         ctl_table vars[3];
427         ctl_table default_dir[2];
428         ctl_table parport_dir[2];
429         ctl_table dev_dir[2];
430 };
431
432 static struct parport_default_sysctl_table
433 parport_default_sysctl_table = {
434         .sysctl_header  = NULL,
435         {
436                 {
437                         .procname       = "timeslice",
438                         .data           = &parport_default_timeslice,
439                         .maxlen         = sizeof(parport_default_timeslice),
440                         .mode           = 0644,
441                         .proc_handler   = &proc_doulongvec_ms_jiffies_minmax,
442                         .extra1         = (void*) &parport_min_timeslice_value,
443                         .extra2         = (void*) &parport_max_timeslice_value
444                 },
445                 {
446                         .procname       = "spintime",
447                         .data           = &parport_default_spintime,
448                         .maxlen         = sizeof(parport_default_spintime),
449                         .mode           = 0644,
450                         .proc_handler   = &proc_dointvec_minmax,
451                         .extra1         = (void*) &parport_min_spintime_value,
452                         .extra2         = (void*) &parport_max_spintime_value
453                 },
454                 {}
455         },
456         {
457                 {
458                         .ctl_name       = DEV_PARPORT_DEFAULT,
459                         .procname       = "default",
460                         .mode           = 0555,
461                         .child          = parport_default_sysctl_table.vars
462                 },
463                 {}
464         },
465         {
466                 PARPORT_PARPORT_DIR(parport_default_sysctl_table.default_dir),
467                 {}
468         },
469         {
470                 PARPORT_DEV_DIR(parport_default_sysctl_table.parport_dir),
471                 {}
472         }
473 };
474
475
476 int parport_proc_register(struct parport *port)
477 {
478         struct parport_sysctl_table *t;
479         int i;
480
481         t = kmalloc(sizeof(*t), GFP_KERNEL);
482         if (t == NULL)
483                 return -ENOMEM;
484         memcpy(t, &parport_sysctl_template, sizeof(*t));
485
486         t->device_dir[0].extra1 = port;
487
488         for (i = 0; i < 5; i++)
489                 t->vars[i].extra1 = port;
490
491         t->vars[0].data = &port->spintime;
492         t->vars[5].child = t->device_dir;
493         
494         for (i = 0; i < 5; i++)
495                 t->vars[6 + i].extra2 = &port->probe_info[i];
496
497         t->port_dir[0].procname = port->name;
498         t->port_dir[0].ctl_name = 0;
499
500         t->port_dir[0].child = t->vars;
501         t->parport_dir[0].child = t->port_dir;
502         t->dev_dir[0].child = t->parport_dir;
503
504         t->sysctl_header = register_sysctl_table(t->dev_dir);
505         if (t->sysctl_header == NULL) {
506                 kfree(t);
507                 t = NULL;
508         }
509         port->sysctl_table = t;
510         return 0;
511 }
512
513 int parport_proc_unregister(struct parport *port)
514 {
515         if (port->sysctl_table) {
516                 struct parport_sysctl_table *t = port->sysctl_table;
517                 port->sysctl_table = NULL;
518                 unregister_sysctl_table(t->sysctl_header);
519                 kfree(t);
520         }
521         return 0;
522 }
523
524 int parport_device_proc_register(struct pardevice *device)
525 {
526         struct parport_device_sysctl_table *t;
527         struct parport * port = device->port;
528         
529         t = kmalloc(sizeof(*t), GFP_KERNEL);
530         if (t == NULL)
531                 return -ENOMEM;
532         memcpy(t, &parport_device_sysctl_template, sizeof(*t));
533
534         t->dev_dir[0].child = t->parport_dir;
535         t->parport_dir[0].child = t->port_dir;
536         t->port_dir[0].procname = port->name;
537         t->port_dir[0].ctl_name = 0;
538         t->port_dir[0].child = t->devices_root_dir;
539         t->devices_root_dir[0].child = t->device_dir;
540
541         t->device_dir[0].ctl_name = 0;
542         t->device_dir[0].procname = device->name;
543         t->device_dir[0].child = t->vars;
544         t->vars[0].data = &device->timeslice;
545
546         t->sysctl_header = register_sysctl_table(t->dev_dir);
547         if (t->sysctl_header == NULL) {
548                 kfree(t);
549                 t = NULL;
550         }
551         device->sysctl_table = t;
552         return 0;
553 }
554
555 int parport_device_proc_unregister(struct pardevice *device)
556 {
557         if (device->sysctl_table) {
558                 struct parport_device_sysctl_table *t = device->sysctl_table;
559                 device->sysctl_table = NULL;
560                 unregister_sysctl_table(t->sysctl_header);
561                 kfree(t);
562         }
563         return 0;
564 }
565
566 static int __init parport_default_proc_register(void)
567 {
568         parport_default_sysctl_table.sysctl_header =
569                 register_sysctl_table(parport_default_sysctl_table.dev_dir);
570         return 0;
571 }
572
573 static void __exit parport_default_proc_unregister(void)
574 {
575         if (parport_default_sysctl_table.sysctl_header) {
576                 unregister_sysctl_table(parport_default_sysctl_table.
577                                         sysctl_header);
578                 parport_default_sysctl_table.sysctl_header = NULL;
579         }
580 }
581
582 #else /* no sysctl or no procfs*/
583
584 int parport_proc_register(struct parport *pp)
585 {
586         return 0;
587 }
588
589 int parport_proc_unregister(struct parport *pp)
590 {
591         return 0;
592 }
593
594 int parport_device_proc_register(struct pardevice *device)
595 {
596         return 0;
597 }
598
599 int parport_device_proc_unregister(struct pardevice *device)
600 {
601         return 0;
602 }
603
604 static int __init parport_default_proc_register (void)
605 {
606         return 0;
607 }
608
609 static void __exit parport_default_proc_unregister (void)
610 {
611 }
612 #endif
613
614 module_init(parport_default_proc_register)
615 module_exit(parport_default_proc_unregister)