1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * interface.c - contains everything related to the user interface
4 *
5 * Some code, especially possible resource dumping is based on isapnp_proc.c (c) Jaroslav Kysela <perex@perex.cz>
6 * Copyright 2002 Adam Belay <ambx1@neo.rr.com>
7 * Copyright (C) 2008 Hewlett-Packard Development Company, L.P.
8 * Bjorn Helgaas <bjorn.helgaas@hp.com>
9 */
10
11 #include <linux/pnp.h>
12 #include <linux/string.h>
13 #include <linux/errno.h>
14 #include <linux/list.h>
15 #include <linux/types.h>
16 #include <linux/stat.h>
17 #include <linux/ctype.h>
18 #include <linux/slab.h>
19 #include <linux/mutex.h>
20
21 #include <linux/uaccess.h>
22
23 #include "base.h"
24
25 struct pnp_info_buffer {
26 char *buffer; /* pointer to begin of buffer */
27 char *curr; /* current position in buffer */
28 unsigned long size; /* current size */
29 unsigned long len; /* total length of buffer */
30 int stop; /* stop flag */
31 int error; /* error code */
32 };
33
34 typedef struct pnp_info_buffer pnp_info_buffer_t;
35
36 __printf(2, 3)
pnp_printf(pnp_info_buffer_t * buffer,char * fmt,...)37 static int pnp_printf(pnp_info_buffer_t * buffer, char *fmt, ...)
38 {
39 va_list args;
40 int res;
41
42 if (buffer->stop || buffer->error)
43 return 0;
44 va_start(args, fmt);
45 res = vsnprintf(buffer->curr, buffer->len - buffer->size, fmt, args);
46 va_end(args);
47 if (buffer->size + res >= buffer->len) {
48 buffer->stop = 1;
49 return 0;
50 }
51 buffer->curr += res;
52 buffer->size += res;
53 return res;
54 }
55
pnp_print_port(pnp_info_buffer_t * buffer,char * space,struct pnp_port * port)56 static void pnp_print_port(pnp_info_buffer_t * buffer, char *space,
57 struct pnp_port *port)
58 {
59 pnp_printf(buffer, "%sport %#llx-%#llx, align %#llx, size %#llx, "
60 "%i-bit address decoding\n", space,
61 (unsigned long long) port->min,
62 (unsigned long long) port->max,
63 port->align ? ((unsigned long long) port->align - 1) : 0,
64 (unsigned long long) port->size,
65 port->flags & IORESOURCE_IO_16BIT_ADDR ? 16 : 10);
66 }
67
pnp_print_irq(pnp_info_buffer_t * buffer,char * space,struct pnp_irq * irq)68 static void pnp_print_irq(pnp_info_buffer_t * buffer, char *space,
69 struct pnp_irq *irq)
70 {
71 int first = 1, i;
72
73 pnp_printf(buffer, "%sirq ", space);
74 for (i = 0; i < PNP_IRQ_NR; i++)
75 if (test_bit(i, irq->map.bits)) {
76 if (!first) {
77 pnp_printf(buffer, ",");
78 } else {
79 first = 0;
80 }
81 if (i == 2 || i == 9)
82 pnp_printf(buffer, "2/9");
83 else
84 pnp_printf(buffer, "%i", i);
85 }
86 if (bitmap_empty(irq->map.bits, PNP_IRQ_NR))
87 pnp_printf(buffer, "<none>");
88 if (irq->flags & IORESOURCE_IRQ_HIGHEDGE)
89 pnp_printf(buffer, " High-Edge");
90 if (irq->flags & IORESOURCE_IRQ_LOWEDGE)
91 pnp_printf(buffer, " Low-Edge");
92 if (irq->flags & IORESOURCE_IRQ_HIGHLEVEL)
93 pnp_printf(buffer, " High-Level");
94 if (irq->flags & IORESOURCE_IRQ_LOWLEVEL)
95 pnp_printf(buffer, " Low-Level");
96 if (irq->flags & IORESOURCE_IRQ_OPTIONAL)
97 pnp_printf(buffer, " (optional)");
98 pnp_printf(buffer, "\n");
99 }
100
pnp_print_dma(pnp_info_buffer_t * buffer,char * space,struct pnp_dma * dma)101 static void pnp_print_dma(pnp_info_buffer_t * buffer, char *space,
102 struct pnp_dma *dma)
103 {
104 int first = 1, i;
105 char *s;
106
107 pnp_printf(buffer, "%sdma ", space);
108 for (i = 0; i < 8; i++)
109 if (dma->map & (1 << i)) {
110 if (!first) {
111 pnp_printf(buffer, ",");
112 } else {
113 first = 0;
114 }
115 pnp_printf(buffer, "%i", i);
116 }
117 if (!dma->map)
118 pnp_printf(buffer, "<none>");
119 switch (dma->flags & IORESOURCE_DMA_TYPE_MASK) {
120 case IORESOURCE_DMA_8BIT:
121 s = "8-bit";
122 break;
123 case IORESOURCE_DMA_8AND16BIT:
124 s = "8-bit&16-bit";
125 break;
126 default:
127 s = "16-bit";
128 }
129 pnp_printf(buffer, " %s", s);
130 if (dma->flags & IORESOURCE_DMA_MASTER)
131 pnp_printf(buffer, " master");
132 if (dma->flags & IORESOURCE_DMA_BYTE)
133 pnp_printf(buffer, " byte-count");
134 if (dma->flags & IORESOURCE_DMA_WORD)
135 pnp_printf(buffer, " word-count");
136 switch (dma->flags & IORESOURCE_DMA_SPEED_MASK) {
137 case IORESOURCE_DMA_TYPEA:
138 s = "type-A";
139 break;
140 case IORESOURCE_DMA_TYPEB:
141 s = "type-B";
142 break;
143 case IORESOURCE_DMA_TYPEF:
144 s = "type-F";
145 break;
146 default:
147 s = "compatible";
148 break;
149 }
150 pnp_printf(buffer, " %s\n", s);
151 }
152
pnp_print_mem(pnp_info_buffer_t * buffer,char * space,struct pnp_mem * mem)153 static void pnp_print_mem(pnp_info_buffer_t * buffer, char *space,
154 struct pnp_mem *mem)
155 {
156 char *s;
157
158 pnp_printf(buffer, "%sMemory %#llx-%#llx, align %#llx, size %#llx",
159 space, (unsigned long long) mem->min,
160 (unsigned long long) mem->max,
161 (unsigned long long) mem->align,
162 (unsigned long long) mem->size);
163 if (mem->flags & IORESOURCE_MEM_WRITEABLE)
164 pnp_printf(buffer, ", writeable");
165 if (mem->flags & IORESOURCE_MEM_CACHEABLE)
166 pnp_printf(buffer, ", cacheable");
167 if (mem->flags & IORESOURCE_MEM_RANGELENGTH)
168 pnp_printf(buffer, ", range-length");
169 if (mem->flags & IORESOURCE_MEM_SHADOWABLE)
170 pnp_printf(buffer, ", shadowable");
171 if (mem->flags & IORESOURCE_MEM_EXPANSIONROM)
172 pnp_printf(buffer, ", expansion ROM");
173 switch (mem->flags & IORESOURCE_MEM_TYPE_MASK) {
174 case IORESOURCE_MEM_8BIT:
175 s = "8-bit";
176 break;
177 case IORESOURCE_MEM_8AND16BIT:
178 s = "8-bit&16-bit";
179 break;
180 case IORESOURCE_MEM_32BIT:
181 s = "32-bit";
182 break;
183 default:
184 s = "16-bit";
185 }
186 pnp_printf(buffer, ", %s\n", s);
187 }
188
pnp_print_option(pnp_info_buffer_t * buffer,char * space,struct pnp_option * option)189 static void pnp_print_option(pnp_info_buffer_t * buffer, char *space,
190 struct pnp_option *option)
191 {
192 switch (option->type) {
193 case IORESOURCE_IO:
194 pnp_print_port(buffer, space, &option->u.port);
195 break;
196 case IORESOURCE_MEM:
197 pnp_print_mem(buffer, space, &option->u.mem);
198 break;
199 case IORESOURCE_IRQ:
200 pnp_print_irq(buffer, space, &option->u.irq);
201 break;
202 case IORESOURCE_DMA:
203 pnp_print_dma(buffer, space, &option->u.dma);
204 break;
205 }
206 }
207
options_show(struct device * dmdev,struct device_attribute * attr,char * buf)208 static ssize_t options_show(struct device *dmdev, struct device_attribute *attr,
209 char *buf)
210 {
211 struct pnp_dev *dev = to_pnp_dev(dmdev);
212 pnp_info_buffer_t *buffer;
213 struct pnp_option *option;
214 int ret, dep = 0, set = 0;
215 char *indent;
216
217 buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
218 if (!buffer)
219 return -ENOMEM;
220
221 buffer->len = PAGE_SIZE;
222 buffer->buffer = buf;
223 buffer->curr = buffer->buffer;
224
225 list_for_each_entry(option, &dev->options, list) {
226 if (pnp_option_is_dependent(option)) {
227 indent = " ";
228 if (!dep || pnp_option_set(option) != set) {
229 set = pnp_option_set(option);
230 dep = 1;
231 pnp_printf(buffer, "Dependent: %02i - "
232 "Priority %s\n", set,
233 pnp_option_priority_name(option));
234 }
235 } else {
236 dep = 0;
237 indent = "";
238 }
239 pnp_print_option(buffer, indent, option);
240 }
241
242 ret = (buffer->curr - buf);
243 kfree(buffer);
244 return ret;
245 }
246 static DEVICE_ATTR_RO(options);
247
resources_show(struct device * dmdev,struct device_attribute * attr,char * buf)248 static ssize_t resources_show(struct device *dmdev,
249 struct device_attribute *attr, char *buf)
250 {
251 struct pnp_dev *dev = to_pnp_dev(dmdev);
252 pnp_info_buffer_t *buffer;
253 struct pnp_resource *pnp_res;
254 struct resource *res;
255 int ret;
256
257 if (!dev)
258 return -EINVAL;
259
260 buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
261 if (!buffer)
262 return -ENOMEM;
263
264 buffer->len = PAGE_SIZE;
265 buffer->buffer = buf;
266 buffer->curr = buffer->buffer;
267
268 pnp_printf(buffer, "state = %s\n", dev->active ? "active" : "disabled");
269
270 list_for_each_entry(pnp_res, &dev->resources, list) {
271 res = &pnp_res->res;
272
273 pnp_printf(buffer, pnp_resource_type_name(res));
274
275 if (res->flags & IORESOURCE_DISABLED) {
276 pnp_printf(buffer, " disabled\n");
277 continue;
278 }
279
280 switch (pnp_resource_type(res)) {
281 case IORESOURCE_IO:
282 case IORESOURCE_MEM:
283 case IORESOURCE_BUS:
284 pnp_printf(buffer, " %#llx-%#llx%s\n",
285 (unsigned long long) res->start,
286 (unsigned long long) res->end,
287 res->flags & IORESOURCE_WINDOW ?
288 " window" : "");
289 break;
290 case IORESOURCE_IRQ:
291 case IORESOURCE_DMA:
292 pnp_printf(buffer, " %lld\n",
293 (unsigned long long) res->start);
294 break;
295 }
296 }
297
298 ret = (buffer->curr - buf);
299 kfree(buffer);
300 return ret;
301 }
302
pnp_get_resource_value(char * buf,unsigned long type,resource_size_t * start,resource_size_t * end,unsigned long * flags)303 static char *pnp_get_resource_value(char *buf,
304 unsigned long type,
305 resource_size_t *start,
306 resource_size_t *end,
307 unsigned long *flags)
308 {
309 if (start)
310 *start = 0;
311 if (end)
312 *end = 0;
313 if (flags)
314 *flags = 0;
315
316 /* TBD: allow for disabled resources */
317
318 buf = skip_spaces(buf);
319 if (start) {
320 *start = simple_strtoull(buf, &buf, 0);
321 if (end) {
322 buf = skip_spaces(buf);
323 if (*buf == '-') {
324 buf = skip_spaces(buf + 1);
325 *end = simple_strtoull(buf, &buf, 0);
326 } else
327 *end = *start;
328 }
329 }
330
331 /* TBD: allow for additional flags, e.g., IORESOURCE_WINDOW */
332
333 return buf;
334 }
335
resources_store(struct device * dmdev,struct device_attribute * attr,const char * ubuf,size_t count)336 static ssize_t resources_store(struct device *dmdev,
337 struct device_attribute *attr, const char *ubuf,
338 size_t count)
339 {
340 struct pnp_dev *dev = to_pnp_dev(dmdev);
341 char *buf = (void *)ubuf;
342 int retval = 0;
343
344 if (dev->status & PNP_ATTACHED) {
345 retval = -EBUSY;
346 dev_info(&dev->dev, "in use; can't configure\n");
347 goto done;
348 }
349
350 buf = skip_spaces(buf);
351 if (!strncasecmp(buf, "disable", 7)) {
352 retval = pnp_disable_dev(dev);
353 goto done;
354 }
355 if (!strncasecmp(buf, "activate", 8)) {
356 retval = pnp_activate_dev(dev);
357 goto done;
358 }
359 if (!strncasecmp(buf, "fill", 4)) {
360 if (dev->active)
361 goto done;
362 retval = pnp_auto_config_dev(dev);
363 goto done;
364 }
365 if (!strncasecmp(buf, "auto", 4)) {
366 if (dev->active)
367 goto done;
368 pnp_init_resources(dev);
369 retval = pnp_auto_config_dev(dev);
370 goto done;
371 }
372 if (!strncasecmp(buf, "clear", 5)) {
373 if (dev->active)
374 goto done;
375 pnp_init_resources(dev);
376 goto done;
377 }
378 if (!strncasecmp(buf, "get", 3)) {
379 mutex_lock(&pnp_res_mutex);
380 if (pnp_can_read(dev))
381 dev->protocol->get(dev);
382 mutex_unlock(&pnp_res_mutex);
383 goto done;
384 }
385 if (!strncasecmp(buf, "set", 3)) {
386 resource_size_t start;
387 resource_size_t end;
388 unsigned long flags;
389
390 if (dev->active)
391 goto done;
392 buf += 3;
393 pnp_init_resources(dev);
394 mutex_lock(&pnp_res_mutex);
395 while (1) {
396 buf = skip_spaces(buf);
397 if (!strncasecmp(buf, "io", 2)) {
398 buf = pnp_get_resource_value(buf + 2,
399 IORESOURCE_IO,
400 &start, &end,
401 &flags);
402 pnp_add_io_resource(dev, start, end, flags);
403 } else if (!strncasecmp(buf, "mem", 3)) {
404 buf = pnp_get_resource_value(buf + 3,
405 IORESOURCE_MEM,
406 &start, &end,
407 &flags);
408 pnp_add_mem_resource(dev, start, end, flags);
409 } else if (!strncasecmp(buf, "irq", 3)) {
410 buf = pnp_get_resource_value(buf + 3,
411 IORESOURCE_IRQ,
412 &start, NULL,
413 &flags);
414 pnp_add_irq_resource(dev, start, flags);
415 } else if (!strncasecmp(buf, "dma", 3)) {
416 buf = pnp_get_resource_value(buf + 3,
417 IORESOURCE_DMA,
418 &start, NULL,
419 &flags);
420 pnp_add_dma_resource(dev, start, flags);
421 } else if (!strncasecmp(buf, "bus", 3)) {
422 buf = pnp_get_resource_value(buf + 3,
423 IORESOURCE_BUS,
424 &start, &end,
425 NULL);
426 pnp_add_bus_resource(dev, start, end);
427 } else
428 break;
429 }
430 mutex_unlock(&pnp_res_mutex);
431 goto done;
432 }
433
434 done:
435 if (retval < 0)
436 return retval;
437 return count;
438 }
439 static DEVICE_ATTR_RW(resources);
440
id_show(struct device * dmdev,struct device_attribute * attr,char * buf)441 static ssize_t id_show(struct device *dmdev, struct device_attribute *attr,
442 char *buf)
443 {
444 char *str = buf;
445 struct pnp_dev *dev = to_pnp_dev(dmdev);
446 struct pnp_id *pos = dev->id;
447
448 while (pos) {
449 str += sprintf(str, "%s\n", pos->id);
450 pos = pos->next;
451 }
452 return (str - buf);
453 }
454 static DEVICE_ATTR_RO(id);
455
456 static struct attribute *pnp_dev_attrs[] = {
457 &dev_attr_resources.attr,
458 &dev_attr_options.attr,
459 &dev_attr_id.attr,
460 NULL,
461 };
462
463 static const struct attribute_group pnp_dev_group = {
464 .attrs = pnp_dev_attrs,
465 };
466
467 const struct attribute_group *pnp_dev_groups[] = {
468 &pnp_dev_group,
469 NULL,
470 };
471