drivers/pnp/interface.c

   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)
  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
  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
  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
 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
 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
 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
 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
 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
 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
 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
 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 };