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 } 210