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 #ifdef DEBUG 79 char buf[128]; 80 int len = 0; 81 struct pnp_resource *pnp_res; 82 struct resource *res; 83 84 if (list_empty(&dev->resources)) { 85 dev_dbg(&dev->dev, "%s: no current resources\n", desc); 86 return; 87 } 88 89 dev_dbg(&dev->dev, "%s: current resources:\n", desc); 90 list_for_each_entry(pnp_res, &dev->resources, list) { 91 res = &pnp_res->res; 92 93 len += snprintf(buf + len, sizeof(buf) - len, " %-3s ", 94 pnp_resource_type_name(res)); 95 96 if (res->flags & IORESOURCE_DISABLED) { 97 dev_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 += snprintf(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 += snprintf(buf + len, sizeof(buf) - len, 113 "%lld flags %#lx", 114 (unsigned long long) res->start, 115 res->flags); 116 break; 117 } 118 dev_dbg(&dev->dev, "%s\n", buf); 119 } 120 #endif 121 } 122 123 char *pnp_option_priority_name(struct pnp_option *option) 124 { 125 switch (pnp_option_priority(option)) { 126 case PNP_RES_PRIORITY_PREFERRED: 127 return "preferred"; 128 case PNP_RES_PRIORITY_ACCEPTABLE: 129 return "acceptable"; 130 case PNP_RES_PRIORITY_FUNCTIONAL: 131 return "functional"; 132 } 133 return "invalid"; 134 } 135 136 void dbg_pnp_show_option(struct pnp_dev *dev, struct pnp_option *option) 137 { 138 #ifdef DEBUG 139 char buf[128]; 140 int len = 0, i; 141 struct pnp_port *port; 142 struct pnp_mem *mem; 143 struct pnp_irq *irq; 144 struct pnp_dma *dma; 145 146 if (pnp_option_is_dependent(option)) 147 len += snprintf(buf + len, sizeof(buf) - len, 148 " dependent set %d (%s) ", 149 pnp_option_set(option), 150 pnp_option_priority_name(option)); 151 else 152 len += snprintf(buf + len, sizeof(buf) - len, " independent "); 153 154 switch (option->type) { 155 case IORESOURCE_IO: 156 port = &option->u.port; 157 len += snprintf(buf + len, sizeof(buf) - len, "io min %#llx " 158 "max %#llx align %lld size %lld flags %#x", 159 (unsigned long long) port->min, 160 (unsigned long long) port->max, 161 (unsigned long long) port->align, 162 (unsigned long long) port->size, port->flags); 163 break; 164 case IORESOURCE_MEM: 165 mem = &option->u.mem; 166 len += snprintf(buf + len, sizeof(buf) - len, "mem min %#llx " 167 "max %#llx align %lld size %lld flags %#x", 168 (unsigned long long) mem->min, 169 (unsigned long long) mem->max, 170 (unsigned long long) mem->align, 171 (unsigned long long) mem->size, mem->flags); 172 break; 173 case IORESOURCE_IRQ: 174 irq = &option->u.irq; 175 len += snprintf(buf + len, sizeof(buf) - len, "irq"); 176 if (bitmap_empty(irq->map.bits, PNP_IRQ_NR)) 177 len += snprintf(buf + len, sizeof(buf) - len, 178 " <none>"); 179 else { 180 for (i = 0; i < PNP_IRQ_NR; i++) 181 if (test_bit(i, irq->map.bits)) 182 len += snprintf(buf + len, 183 sizeof(buf) - len, 184 " %d", i); 185 } 186 len += snprintf(buf + len, sizeof(buf) - len, " flags %#x", 187 irq->flags); 188 if (irq->flags & IORESOURCE_IRQ_OPTIONAL) 189 len += snprintf(buf + len, sizeof(buf) - len, 190 " (optional)"); 191 break; 192 case IORESOURCE_DMA: 193 dma = &option->u.dma; 194 len += snprintf(buf + len, sizeof(buf) - len, "dma"); 195 if (!dma->map) 196 len += snprintf(buf + len, sizeof(buf) - len, 197 " <none>"); 198 else { 199 for (i = 0; i < 8; i++) 200 if (dma->map & (1 << i)) 201 len += snprintf(buf + len, 202 sizeof(buf) - len, 203 " %d", i); 204 } 205 len += snprintf(buf + len, sizeof(buf) - len, " (bitmask %#x) " 206 "flags %#x", dma->map, dma->flags); 207 break; 208 } 209 dev_dbg(&dev->dev, "%s\n", buf); 210 #endif 211 } 212