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         char buf[128];
  79         int len;
  80         struct pnp_resource *pnp_res;
  81         struct resource *res;
  82
  83         if (list_empty(&dev->resources)) {
  84                 pnp_dbg(&dev->dev, "%s: no current resources\n", desc);
  85                 return;
  86         }
  87
  88         pnp_dbg(&dev->dev, "%s: current resources:\n", desc);
  89         list_for_each_entry(pnp_res, &dev->resources, list) {
  90                 res = &pnp_res->res;
  91                 len = 0;
  92
  93                 len += scnprintf(buf + len, sizeof(buf) - len, "  %-3s ",
  94                                  pnp_resource_type_name(res));
  95
  96                 if (res->flags & IORESOURCE_DISABLED) {
  97                         pnp_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 += scnprintf(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 += scnprintf(buf + len, sizeof(buf) - len,
 113                                          "%lld flags %#lx",
 114                                          (unsigned long long) res->start,
 115                                          res->flags);
 116                         break;
 117                 }
 118                 pnp_dbg(&dev->dev, "%s\n", buf);
 119         }
 120 }
 121
 122 char *pnp_option_priority_name(struct pnp_option *option)
 123 {
 124         switch (pnp_option_priority(option)) {
 125         case PNP_RES_PRIORITY_PREFERRED:
 126                 return "preferred";
 127         case PNP_RES_PRIORITY_ACCEPTABLE:
 128                 return "acceptable";
 129         case PNP_RES_PRIORITY_FUNCTIONAL:
 130                 return "functional";
 131         }
 132         return "invalid";
 133 }
 134
 135 void dbg_pnp_show_option(struct pnp_dev *dev, struct pnp_option *option)
 136 {
 137         char buf[128];
 138         int len = 0, i;
 139         struct pnp_port *port;
 140         struct pnp_mem *mem;
 141         struct pnp_irq *irq;
 142         struct pnp_dma *dma;
 143
 144         if (pnp_option_is_dependent(option))
 145                 len += scnprintf(buf + len, sizeof(buf) - len,
 146                                  "  dependent set %d (%s) ",
 147                                  pnp_option_set(option),
 148                                  pnp_option_priority_name(option));
 149         else
 150                 len += scnprintf(buf + len, sizeof(buf) - len,
 151                                  "  independent ");
 152
 153         switch (option->type) {
 154         case IORESOURCE_IO:
 155                 port = &option->u.port;
 156                 len += scnprintf(buf + len, sizeof(buf) - len, "io  min %#llx "
 157                                  "max %#llx align %lld size %lld flags %#x",
 158                                  (unsigned long long) port->min,
 159                                  (unsigned long long) port->max,
 160                                  (unsigned long long) port->align,
 161                                  (unsigned long long) port->size, port->flags);
 162                 break;
 163         case IORESOURCE_MEM:
 164                 mem = &option->u.mem;
 165                 len += scnprintf(buf + len, sizeof(buf) - len, "mem min %#llx "
 166                                  "max %#llx align %lld size %lld flags %#x",
 167                                  (unsigned long long) mem->min,
 168                                  (unsigned long long) mem->max,
 169                                  (unsigned long long) mem->align,
 170                                  (unsigned long long) mem->size, mem->flags);
 171                 break;
 172         case IORESOURCE_IRQ:
 173                 irq = &option->u.irq;
 174                 len += scnprintf(buf + len, sizeof(buf) - len, "irq");
 175                 if (bitmap_empty(irq->map.bits, PNP_IRQ_NR))
 176                         len += scnprintf(buf + len, sizeof(buf) - len,
 177                                          " <none>");
 178                 else {
 179                         for (i = 0; i < PNP_IRQ_NR; i++)
 180                                 if (test_bit(i, irq->map.bits))
 181                                         len += scnprintf(buf + len,
 182                                                          sizeof(buf) - len,
 183                                                          " %d", i);
 184                 }
 185                 len += scnprintf(buf + len, sizeof(buf) - len, " flags %#x",
 186                                  irq->flags);
 187                 if (irq->flags & IORESOURCE_IRQ_OPTIONAL)
 188                         len += scnprintf(buf + len, sizeof(buf) - len,
 189                                          " (optional)");
 190                 break;
 191         case IORESOURCE_DMA:
 192                 dma = &option->u.dma;
 193                 len += scnprintf(buf + len, sizeof(buf) - len, "dma");
 194                 if (!dma->map)
 195                         len += scnprintf(buf + len, sizeof(buf) - len,
 196                                          " <none>");
 197                 else {
 198                         for (i = 0; i < 8; i++)
 199                                 if (dma->map & (1 << i))
 200                                         len += scnprintf(buf + len,
 201                                                          sizeof(buf) - len,
 202                                                          " %d", i);
 203                 }
 204                 len += scnprintf(buf + len, sizeof(buf) - len, " (bitmask %#x) "
 205                                  "flags %#x", dma->map, dma->flags);
 206                 break;
 207         }
 208         pnp_dbg(&dev->dev, "%s\n", buf);
 209 }