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1// SPDX-License-Identifier: GPL-2.02/*3 * support.c - standard functions for the use of pnp protocol drivers4 *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 current17 * resources18 * @dev: pointer to the desired PnP device19 */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 else31 return 1;32}33EXPORT_SYMBOL(pnp_is_active);34 35/*36 * Functionally similar to acpi_ex_eisa_id_to_string(), but that's37 * 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-bit45 * compressed ASCII, and the left-over high order bit should be zero.46 * However, the Linux ISAPNP code historically used six bits for the47 * first character, and there seem to be IDs that depend on that,48 * e.g., "nEC8241" in the Linux 8250_pnp serial driver and the49 * 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 else119 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