LXR linux/drivers/pnp/support.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * support.c - standard functions for the use of pnp protocol drivers
   4 *
   5 * Copyright 2003 Adam Belay <ambx1@neo.rr.com>
   6 * Copyright (C) 2008 Hewlett-Packard Development Company, L.P.
   7 *      Bjorn Helgaas <bjorn.helgaas@hp.com>
   8 */
   9
  10#include <linux/module.h>
  11#include <linux/ctype.h>
  12#include <linux/pnp.h>
  13#include "base.h"
  14
  15/**
  16 * pnp_is_active - Determines if a device is active based on its current
  17 *      resources
  18 * @dev: pointer to the desired PnP device
  19 */
  20int pnp_is_active(struct pnp_dev *dev)
  21{
  22        /*
  23         * I don't think this is very reliable because pnp_disable_dev()
  24         * only clears out auto-assigned resources.
  25         */
  26        if (!pnp_port_start(dev, 0) && pnp_port_len(dev, 0) <= 1 &&
  27            !pnp_mem_start(dev, 0) && pnp_mem_len(dev, 0) <= 1 &&
  28            pnp_irq(dev, 0) == -1 && pnp_dma(dev, 0) == -1)
  29                return 0;
  30        else
  31                return 1;
  32}
  33EXPORT_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 */
  39void 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
  61char *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
  78void 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
  91char *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
 104void 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}
 179