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 char *pnp_resource_type_name(struct resource *res)
  56 {
  57         switch (pnp_resource_type(res)) {
  58         case IORESOURCE_IO:
  59                 return "io";
  60         case IORESOURCE_MEM:
  61                 return "mem";
  62         case IORESOURCE_IRQ:
  63                 return "irq";
  64         case IORESOURCE_DMA:
  65                 return "dma";
  66         }
  67         return NULL;
  68 }
  69
  70 void dbg_pnp_show_resources(struct pnp_dev *dev, char *desc)
  71 {
  72 #ifdef DEBUG
  73         struct resource *res;
  74         int i;
  75
  76         dev_dbg(&dev->dev, "current resources: %s\n", desc);
  77
  78         for (i = 0; i < PNP_MAX_IRQ; i++) {
  79                 res = pnp_get_resource(dev, IORESOURCE_IRQ, i);
  80                 if (res && !(res->flags & IORESOURCE_UNSET))
  81                         dev_dbg(&dev->dev, "  irq %lld flags %#lx%s%s\n",
  82                                 (unsigned long long) res->start, res->flags,
  83                                 res->flags & IORESOURCE_DISABLED ?
  84                                         " DISABLED" : "",
  85                                 res->flags & IORESOURCE_AUTO ?
  86                                         " AUTO" : "");
  87         }
  88         for (i = 0; i < PNP_MAX_DMA; i++) {
  89                 res = pnp_get_resource(dev, IORESOURCE_DMA, i);
  90                 if (res && !(res->flags & IORESOURCE_UNSET))
  91                         dev_dbg(&dev->dev, "  dma %lld flags %#lx%s%s\n",
  92                                 (unsigned long long) res->start, res->flags,
  93                                 res->flags & IORESOURCE_DISABLED ?
  94                                         " DISABLED" : "",
  95                                 res->flags & IORESOURCE_AUTO ?
  96                                         " AUTO" : "");
  97         }
  98         for (i = 0; i < PNP_MAX_PORT; i++) {
  99                 res = pnp_get_resource(dev, IORESOURCE_IO, i);
 100                 if (res && !(res->flags & IORESOURCE_UNSET))
 101                         dev_dbg(&dev->dev, "  io  %#llx-%#llx flags %#lx"
 102                                 "%s%s\n",
 103                                 (unsigned long long) res->start,
 104                                 (unsigned long long) res->end, res->flags,
 105                                 res->flags & IORESOURCE_DISABLED ?
 106                                         " DISABLED" : "",
 107                                 res->flags & IORESOURCE_AUTO ?
 108                                         " AUTO" : "");
 109         }
 110         for (i = 0; i < PNP_MAX_MEM; i++) {
 111                 res = pnp_get_resource(dev, IORESOURCE_MEM, i);
 112                 if (res && !(res->flags & IORESOURCE_UNSET))
 113                         dev_dbg(&dev->dev, "  mem %#llx-%#llx flags %#lx"
 114                                 "%s%s\n",
 115                                 (unsigned long long) res->start,
 116                                 (unsigned long long) res->end, res->flags,
 117                                 res->flags & IORESOURCE_DISABLED ?
 118                                         " DISABLED" : "",
 119                                 res->flags & IORESOURCE_AUTO ?
 120                                         " AUTO" : "");
 121         }
 122 #endif
 123 }