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         case IORESOURCE_BUS:
  73                 return "bus";
  74         }
  75         return "unknown";
  76 }
  77
  78 void dbg_pnp_show_resources(struct pnp_dev *dev, char *desc)
  79 {
  80         struct pnp_resource *pnp_res;
  81
  82         if (list_empty(&dev->resources))
  83                 pnp_dbg(&dev->dev, "%s: no current resources\n", desc);
  84         else {
  85                 pnp_dbg(&dev->dev, "%s: current resources:\n", desc);
  86                 list_for_each_entry(pnp_res, &dev->resources, list)
  87                         pnp_dbg(&dev->dev, "%pr\n", &pnp_res->res);
  88         }
  89 }
  90
  91 char *pnp_option_priority_name(struct pnp_option *option)
  92 {
  93         switch (pnp_option_priority(option)) {
  94         case PNP_RES_PRIORITY_PREFERRED:
  95                 return "preferred";
  96         case PNP_RES_PRIORITY_ACCEPTABLE:
  97                 return "acceptable";
  98         case PNP_RES_PRIORITY_FUNCTIONAL:
  99                 return "functional";
 100         }
 101         return "invalid";
 102 }
 103
 104 void dbg_pnp_show_option(struct pnp_dev *dev, struct pnp_option *option)
 105 {
 106         char buf[128];
 107         int len = 0, i;
 108         struct pnp_port *port;
 109         struct pnp_mem *mem;
 110         struct pnp_irq *irq;
 111         struct pnp_dma *dma;
 112
 113         if (pnp_option_is_dependent(option))
 114                 len += scnprintf(buf + len, sizeof(buf) - len,
 115                                  "  dependent set %d (%s) ",
 116                                  pnp_option_set(option),
 117                                  pnp_option_priority_name(option));
 118         else
 119                 len += scnprintf(buf + len, sizeof(buf) - len,
 120                                  "  independent ");
 121
 122         switch (option->type) {
 123         case IORESOURCE_IO:
 124                 port = &option->u.port;
 125                 len += scnprintf(buf + len, sizeof(buf) - len, "io  min %#llx "
 126                                  "max %#llx align %lld size %lld flags %#x",
 127                                  (unsigned long long) port->min,
 128                                  (unsigned long long) port->max,
 129                                  (unsigned long long) port->align,
 130                                  (unsigned long long) port->size, port->flags);
 131                 break;
 132         case IORESOURCE_MEM:
 133                 mem = &option->u.mem;
 134                 len += scnprintf(buf + len, sizeof(buf) - len, "mem min %#llx "
 135                                  "max %#llx align %lld size %lld flags %#x",
 136                                  (unsigned long long) mem->min,
 137                                  (unsigned long long) mem->max,
 138                                  (unsigned long long) mem->align,
 139                                  (unsigned long long) mem->size, mem->flags);
 140                 break;
 141         case IORESOURCE_IRQ:
 142                 irq = &option->u.irq;
 143                 len += scnprintf(buf + len, sizeof(buf) - len, "irq");
 144                 if (bitmap_empty(irq->map.bits, PNP_IRQ_NR))
 145                         len += scnprintf(buf + len, sizeof(buf) - len,
 146                                          " <none>");
 147                 else {
 148                         for (i = 0; i < PNP_IRQ_NR; i++)
 149                                 if (test_bit(i, irq->map.bits))
 150                                         len += scnprintf(buf + len,
 151                                                          sizeof(buf) - len,
 152                                                          " %d", i);
 153                 }
 154                 len += scnprintf(buf + len, sizeof(buf) - len, " flags %#x",
 155                                  irq->flags);
 156                 if (irq->flags & IORESOURCE_IRQ_OPTIONAL)
 157                         len += scnprintf(buf + len, sizeof(buf) - len,
 158                                          " (optional)");
 159                 break;
 160         case IORESOURCE_DMA:
 161                 dma = &option->u.dma;
 162                 len += scnprintf(buf + len, sizeof(buf) - len, "dma");
 163                 if (!dma->map)
 164                         len += scnprintf(buf + len, sizeof(buf) - len,
 165                                          " <none>");
 166                 else {
 167                         for (i = 0; i < 8; i++)
 168                                 if (dma->map & (1 << i))
 169                                         len += scnprintf(buf + len,
 170                                                          sizeof(buf) - len,
 171                                                          " %d", i);
 172                 }
 173                 len += scnprintf(buf + len, sizeof(buf) - len, " (bitmask %#x) "
 174                                  "flags %#x", dma->map, dma->flags);
 175                 break;
 176         }
 177         pnp_dbg(&dev->dev, "%s\n", buf);
 178 }