drivers/pnp/support.c

   1 /*
   2  * support.c - standard functions for the use of pnp protocol drivers
   3  *
   4  * Copyright 2003 Adam Belay <ambx1@neo.rr.com>
   5  */
   6
   7 #include <linux/module.h>
   8 #include <linux/ctype.h>
   9 #include <linux/pnp.h>
  10 #include "base.h"
  11
  12 /**
  13  * pnp_is_active - Determines if a device is active based on its current
  14  *      resources
  15  * @dev: pointer to the desired PnP device
  16  */
  17 int pnp_is_active(struct pnp_dev *dev)
  18 {
  19         if (!pnp_port_start(dev, 0) && pnp_port_len(dev, 0) <= 1 &&
  20             !pnp_mem_start(dev, 0) && pnp_mem_len(dev, 0) <= 1 &&
  21             pnp_irq(dev, 0) == -1 && pnp_dma(dev, 0) == -1)
  22                 return 0;
  23         else
  24                 return 1;
  25 }
  26
  27 EXPORT_SYMBOL(pnp_is_active);
  28
  29 /*
  30  * Functionally similar to acpi_ex_eisa_id_to_string(), but that's
  31  * buried in the ACPI CA, and we can't depend on it being present.
  32  */
  33 void pnp_eisa_id_to_string(u32 id, char *str)
  34 {
  35         id = be32_to_cpu(id);
  36
  37         /*
  38          * According to the specs, the first three characters are five-bit
  39          * compressed ASCII, and the left-over high order bit should be zero.
  40          * However, the Linux ISAPNP code historically used six bits for the
  41          * first character, and there seem to be IDs that depend on that,
  42          * e.g., "nEC8241" in the Linux 8250_pnp serial driver and the
  43          * FreeBSD sys/pc98/cbus/sio_cbus.c driver.
  44          */
  45         str[0] = 'A' + ((id >> 26) & 0x3f) - 1;
  46         str[1] = 'A' + ((id >> 21) & 0x1f) - 1;
  47         str[2] = 'A' + ((id >> 16) & 0x1f) - 1;
  48         str[3] = hex_asc_hi(id >> 8);
  49         str[4] = hex_asc_lo(id >> 8);
  50         str[5] = hex_asc_hi(id);
  51         str[6] = hex_asc_lo(id);
  52         str[7] = '\0';
  53 }
  54
  55 void dbg_pnp_show_resources(struct pnp_dev *dev, char *desc)
  56 {
  57 #ifdef DEBUG
  58         struct resource *res;
  59         int i;
  60
  61         dev_dbg(&dev->dev, "current resources: %s\n", desc);
  62
  63         for (i = 0; i < PNP_MAX_IRQ; i++) {
  64                 res = pnp_get_resource(dev, IORESOURCE_IRQ, i);
  65                 if (res && !(res->flags & IORESOURCE_UNSET))
  66                         dev_dbg(&dev->dev, "  irq %lld flags %#lx\n",
  67                                 (unsigned long long) res->start, res->flags);
  68         }
  69         for (i = 0; i < PNP_MAX_DMA; i++) {
  70                 res = pnp_get_resource(dev, IORESOURCE_DMA, i);
  71                 if (res && !(res->flags & IORESOURCE_UNSET))
  72                         dev_dbg(&dev->dev, "  dma %lld flags %#lx\n",
  73                                 (unsigned long long) res->start, res->flags);
  74         }
  75         for (i = 0; i < PNP_MAX_PORT; i++) {
  76                 res = pnp_get_resource(dev, IORESOURCE_IO, i);
  77                 if (res && !(res->flags & IORESOURCE_UNSET))
  78                         dev_dbg(&dev->dev, "  io  %#llx-%#llx flags %#lx\n",
  79                                 (unsigned long long) res->start,
  80                                 (unsigned long long) res->end, res->flags);
  81         }
  82         for (i = 0; i < PNP_MAX_MEM; i++) {
  83                 res = pnp_get_resource(dev, IORESOURCE_MEM, i);
  84                 if (res && !(res->flags & IORESOURCE_UNSET))
  85                         dev_dbg(&dev->dev, "  mem %#llx-%#llx flags %#lx\n",
  86                                 (unsigned long long) res->start,
  87                                 (unsigned long long) res->end, res->flags);
  88         }
  89 #endif
  90 }