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