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         /*
  20          * I don't think this is very reliable because pnp_disable_dev()
  21          * only clears out auto-assigned resources.
  22          */
  23         if (!pnp_port_start(dev, 0) && pnp_port_len(dev, 0) <= 1 &&
  24             !pnp_mem_start(dev, 0) && pnp_mem_len(dev, 0) <= 1 &&
  25             pnp_irq(dev, 0) == -1 && pnp_dma(dev, 0) == -1)
  26                 return 0;
  27         else
  28                 return 1;
  29 }
  30
  31 EXPORT_SYMBOL(pnp_is_active);
  32
  33 /*
  34  * Functionally similar to acpi_ex_eisa_id_to_string(), but that's
  35  * buried in the ACPI CA, and we can't depend on it being present.
  36  */
  37 void pnp_eisa_id_to_string(u32 id, char *str)
  38 {
  39         id = be32_to_cpu(id);
  40
  41         /*
  42          * According to the specs, the first three characters are five-bit
  43          * compressed ASCII, and the left-over high order bit should be zero.
  44          * However, the Linux ISAPNP code historically used six bits for the
  45          * first character, and there seem to be IDs that depend on that,
  46          * e.g., "nEC8241" in the Linux 8250_pnp serial driver and the
  47          * FreeBSD sys/pc98/cbus/sio_cbus.c driver.
  48          */
  49         str[0] = 'A' + ((id >> 26) & 0x3f) - 1;
  50         str[1] = 'A' + ((id >> 21) & 0x1f) - 1;
  51         str[2] = 'A' + ((id >> 16) & 0x1f) - 1;
  52         str[3] = hex_asc_hi(id >> 8);
  53         str[4] = hex_asc_lo(id >> 8);
  54         str[5] = hex_asc_hi(id);
  55         str[6] = hex_asc_lo(id);
  56         str[7] = '\0';
  57 }
  58
  59 char *pnp_resource_type_name(struct resource *res)
  60 {
  61         switch (pnp_resource_type(res)) {
  62         case IORESOURCE_IO:
  63                 return "io";
  64         case IORESOURCE_MEM:
  65                 return "mem";
  66         case IORESOURCE_IRQ:
  67                 return "irq";
  68         case IORESOURCE_DMA:
  69                 return "dma";
  70         }
  71         return NULL;
  72 }
  73
  74 void dbg_pnp_show_resources(struct pnp_dev *dev, char *desc)
  75 {
  76 #ifdef DEBUG
  77         char buf[128];
  78         int len = 0;
  79         struct pnp_resource *pnp_res;
  80         struct resource *res;
  81
  82         if (list_empty(&dev->resources)) {
  83                 dev_dbg(&dev->dev, "%s: no current resources\n", desc);
  84                 return;
  85         }
  86
  87         dev_dbg(&dev->dev, "%s: current resources:\n", desc);
  88         list_for_each_entry(pnp_res, &dev->resources, list) {
  89                 res = &pnp_res->res;
  90
  91                 len += snprintf(buf + len, sizeof(buf) - len, "  %-3s ",
  92                                 pnp_resource_type_name(res));
  93
  94                 if (res->flags & IORESOURCE_DISABLED) {
  95                         dev_dbg(&dev->dev, "%sdisabled\n", buf);
  96                         continue;
  97                 }
  98
  99                 switch (pnp_resource_type(res)) {
 100                 case IORESOURCE_IO:
 101                 case IORESOURCE_MEM:
 102                         len += snprintf(buf + len, sizeof(buf) - len,
 103                                         "%#llx-%#llx flags %#lx",
 104                                         (unsigned long long) res->start,
 105                                         (unsigned long long) res->end,
 106                                         res->flags);
 107                         break;
 108                 case IORESOURCE_IRQ:
 109                 case IORESOURCE_DMA:
 110                         len += snprintf(buf + len, sizeof(buf) - len,
 111                                         "%lld flags %#lx",
 112                                         (unsigned long long) res->start,
 113                                         res->flags);
 114                         break;
 115                 }
 116                 dev_dbg(&dev->dev, "%s\n", buf);
 117         }
 118 #endif
 119 }