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  * Copyright (C) 2008 Hewlett-Packard Development Company, L.P.
   6  *      Bjorn Helgaas <bjorn.helgaas@hp.com>
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/ctype.h>
  11 #include <linux/pnp.h>
  12 #include "base.h"
  13
  14 /**
  15  * pnp_is_active - Determines if a device is active based on its current
  16  *      resources
  17  * @dev: pointer to the desired PnP device
  18  */
  19 int pnp_is_active(struct pnp_dev *dev)
  20 {
  21         /*
  22          * I don't think this is very reliable because pnp_disable_dev()
  23          * only clears out auto-assigned resources.
  24          */
  25         if (!pnp_port_start(dev, 0) && pnp_port_len(dev, 0) <= 1 &&
  26             !pnp_mem_start(dev, 0) && pnp_mem_len(dev, 0) <= 1 &&
  27             pnp_irq(dev, 0) == -1 && pnp_dma(dev, 0) == -1)
  28                 return 0;
  29         else
  30                 return 1;
  31 }
  32
  33 EXPORT_SYMBOL(pnp_is_active);
  34
  35 /*
  36  * Functionally similar to acpi_ex_eisa_id_to_string(), but that's
  37  * buried in the ACPI CA, and we can't depend on it being present.
  38  */
  39 void pnp_eisa_id_to_string(u32 id, char *str)
  40 {
  41         id = be32_to_cpu(id);
  42
  43         /*
  44          * According to the specs, the first three characters are five-bit
  45          * compressed ASCII, and the left-over high order bit should be zero.
  46          * However, the Linux ISAPNP code historically used six bits for the
  47          * first character, and there seem to be IDs that depend on that,
  48          * e.g., "nEC8241" in the Linux 8250_pnp serial driver and the
  49          * FreeBSD sys/pc98/cbus/sio_cbus.c driver.
  50          */
  51         str[0] = 'A' + ((id >> 26) & 0x3f) - 1;
  52         str[1] = 'A' + ((id >> 21) & 0x1f) - 1;
  53         str[2] = 'A' + ((id >> 16) & 0x1f) - 1;
  54         str[3] = hex_asc_hi(id >> 8);
  55         str[4] = hex_asc_lo(id >> 8);
  56         str[5] = hex_asc_hi(id);
  57         str[6] = hex_asc_lo(id);
  58         str[7] = '\0';
  59 }
  60
  61 char *pnp_resource_type_name(struct resource *res)
  62 {
  63         switch (pnp_resource_type(res)) {
  64         case IORESOURCE_IO:
  65                 return "io";
  66         case IORESOURCE_MEM:
  67                 return "mem";
  68         case IORESOURCE_IRQ:
  69                 return "irq";
  70         case IORESOURCE_DMA:
  71                 return "dma";
  72         }
  73         return NULL;
  74 }
  75
  76 void dbg_pnp_show_resources(struct pnp_dev *dev, char *desc)
  77 {
  78 #ifdef DEBUG
  79         char buf[128];
  80         int len = 0;
  81         struct pnp_resource *pnp_res;
  82         struct resource *res;
  83
  84         if (list_empty(&dev->resources)) {
  85                 dev_dbg(&dev->dev, "%s: no current resources\n", desc);
  86                 return;
  87         }
  88
  89         dev_dbg(&dev->dev, "%s: current resources:\n", desc);
  90         list_for_each_entry(pnp_res, &dev->resources, list) {
  91                 res = &pnp_res->res;
  92
  93                 len += snprintf(buf + len, sizeof(buf) - len, "  %-3s ",
  94                                 pnp_resource_type_name(res));
  95
  96                 if (res->flags & IORESOURCE_DISABLED) {
  97                         dev_dbg(&dev->dev, "%sdisabled\n", buf);
  98                         continue;
  99                 }
 100
 101                 switch (pnp_resource_type(res)) {
 102                 case IORESOURCE_IO:
 103                 case IORESOURCE_MEM:
 104                         len += snprintf(buf + len, sizeof(buf) - len,
 105                                         "%#llx-%#llx flags %#lx",
 106                                         (unsigned long long) res->start,
 107                                         (unsigned long long) res->end,
 108                                         res->flags);
 109                         break;
 110                 case IORESOURCE_IRQ:
 111                 case IORESOURCE_DMA:
 112                         len += snprintf(buf + len, sizeof(buf) - len,
 113                                         "%lld flags %#lx",
 114                                         (unsigned long long) res->start,
 115                                         res->flags);
 116                         break;
 117                 }
 118                 dev_dbg(&dev->dev, "%s\n", buf);
 119         }
 120 #endif
 121 }
 122
 123 char *pnp_option_priority_name(struct pnp_option *option)
 124 {
 125         switch (pnp_option_priority(option)) {
 126         case PNP_RES_PRIORITY_PREFERRED:
 127                 return "preferred";
 128         case PNP_RES_PRIORITY_ACCEPTABLE:
 129                 return "acceptable";
 130         case PNP_RES_PRIORITY_FUNCTIONAL:
 131                 return "functional";
 132         }
 133         return "invalid";
 134 }
 135
 136 void dbg_pnp_show_option(struct pnp_dev *dev, struct pnp_option *option)
 137 {
 138 #ifdef DEBUG
 139         char buf[128];
 140         int len = 0, i;
 141         struct pnp_port *port;
 142         struct pnp_mem *mem;
 143         struct pnp_irq *irq;
 144         struct pnp_dma *dma;
 145
 146         if (pnp_option_is_dependent(option))
 147                 len += snprintf(buf + len, sizeof(buf) - len,
 148                                 "  dependent set %d (%s) ",
 149                                 pnp_option_set(option),
 150                                 pnp_option_priority_name(option));
 151         else
 152                 len += snprintf(buf + len, sizeof(buf) - len, "  independent ");
 153
 154         switch (option->type) {
 155         case IORESOURCE_IO:
 156                 port = &option->u.port;
 157                 len += snprintf(buf + len, sizeof(buf) - len, "io  min %#llx "
 158                                 "max %#llx align %lld size %lld flags %#x",
 159                                 (unsigned long long) port->min,
 160                                 (unsigned long long) port->max,
 161                                 (unsigned long long) port->align,
 162                                 (unsigned long long) port->size, port->flags);
 163                 break;
 164         case IORESOURCE_MEM:
 165                 mem = &option->u.mem;
 166                 len += snprintf(buf + len, sizeof(buf) - len, "mem min %#llx "
 167                                 "max %#llx align %lld size %lld flags %#x",
 168                                 (unsigned long long) mem->min,
 169                                 (unsigned long long) mem->max,
 170                                 (unsigned long long) mem->align,
 171                                 (unsigned long long) mem->size, mem->flags);
 172                 break;
 173         case IORESOURCE_IRQ:
 174                 irq = &option->u.irq;
 175                 len += snprintf(buf + len, sizeof(buf) - len, "irq");
 176                 if (bitmap_empty(irq->map.bits, PNP_IRQ_NR))
 177                         len += snprintf(buf + len, sizeof(buf) - len,
 178                                         " <none>");
 179                 else {
 180                         for (i = 0; i < PNP_IRQ_NR; i++)
 181                                 if (test_bit(i, irq->map.bits))
 182                                         len += snprintf(buf + len,
 183                                                         sizeof(buf) - len,
 184                                                         " %d", i);
 185                 }
 186                 len += snprintf(buf + len, sizeof(buf) - len, " flags %#x",
 187                                 irq->flags);
 188                 if (irq->flags & IORESOURCE_IRQ_OPTIONAL)
 189                         len += snprintf(buf + len, sizeof(buf) - len,
 190                                         " (optional)");
 191                 break;
 192         case IORESOURCE_DMA:
 193                 dma = &option->u.dma;
 194                 len += snprintf(buf + len, sizeof(buf) - len, "dma");
 195                 if (!dma->map)
 196                         len += snprintf(buf + len, sizeof(buf) - len,
 197                                         " <none>");
 198                 else {
 199                         for (i = 0; i < 8; i++)
 200                                 if (dma->map & (1 << i))
 201                                         len += snprintf(buf + len,
 202                                                         sizeof(buf) - len,
 203                                                         " %d", i);
 204                 }
 205                 len += snprintf(buf + len, sizeof(buf) - len, " (bitmask %#x) "
 206                                 "flags %#x", dma->map, dma->flags);
 207                 break;
 208         }
 209         dev_dbg(&dev->dev, "%s\n", buf);
 210 #endif
 211 }