1 /* 2 * support.c - standard functions for the use of pnp protocol drivers 3 * 4 * Copyright 2003 Adam Belay <ambx1@neo.rr.com> 5 */ 6 7 #include <linux/module.h> 8 #include <linux/ctype.h> 9 #include <linux/pnp.h> 10 #include "base.h" 11 12 /** 13 * pnp_is_active - Determines if a device is active based on its current 14 * resources 15 * @dev: pointer to the desired PnP device 16 */ 17 int pnp_is_active(struct pnp_dev *dev) 18 { 19 if (!pnp_port_start(dev, 0) && pnp_port_len(dev, 0) <= 1 && 20 !pnp_mem_start(dev, 0) && pnp_mem_len(dev, 0) <= 1 && 21 pnp_irq(dev, 0) == -1 && pnp_dma(dev, 0) == -1) 22 return 0; 23 else 24 return 1; 25 } 26 27 EXPORT_SYMBOL(pnp_is_active); 28 29 /* 30 * Functionally similar to acpi_ex_eisa_id_to_string(), but that's 31 * buried in the ACPI CA, and we can't depend on it being present. 32 */ 33 void pnp_eisa_id_to_string(u32 id, char *str) 34 { 35 id = be32_to_cpu(id); 36 37 /* 38 * According to the specs, the first three characters are five-bit 39 * compressed ASCII, and the left-over high order bit should be zero. 40 * However, the Linux ISAPNP code historically used six bits for the 41 * first character, and there seem to be IDs that depend on that, 42 * e.g., "nEC8241" in the Linux 8250_pnp serial driver and the 43 * FreeBSD sys/pc98/cbus/sio_cbus.c driver. 44 */ 45 str[0] = 'A' + ((id >> 26) & 0x3f) - 1; 46 str[1] = 'A' + ((id >> 21) & 0x1f) - 1; 47 str[2] = 'A' + ((id >> 16) & 0x1f) - 1; 48 str[3] = hex_asc((id >> 12) & 0xf); 49 str[4] = hex_asc((id >> 8) & 0xf); 50 str[5] = hex_asc((id >> 4) & 0xf); 51 str[6] = hex_asc((id >> 0) & 0xf); 52 str[7] = '\0'; 53 } 54 55 void dbg_pnp_show_resources(struct pnp_dev *dev, char *desc) 56 { 57 #ifdef DEBUG 58 struct resource *res; 59 int i; 60 61 dev_dbg(&dev->dev, "current resources: %s\n", desc); 62 63 for (i = 0; i < PNP_MAX_IRQ; i++) { 64 res = pnp_get_resource(dev, IORESOURCE_IRQ, i); 65 if (res && !(res->flags & IORESOURCE_UNSET)) 66 dev_dbg(&dev->dev, " irq %lld flags %#lx\n", 67 (unsigned long long) res->start, res->flags); 68 } 69 for (i = 0; i < PNP_MAX_DMA; i++) { 70 res = pnp_get_resource(dev, IORESOURCE_DMA, i); 71 if (res && !(res->flags & IORESOURCE_UNSET)) 72 dev_dbg(&dev->dev, " dma %lld flags %#lx\n", 73 (unsigned long long) res->start, res->flags); 74 } 75 for (i = 0; i < PNP_MAX_PORT; i++) { 76 res = pnp_get_resource(dev, IORESOURCE_IO, i); 77 if (res && !(res->flags & IORESOURCE_UNSET)) 78 dev_dbg(&dev->dev, " io %#llx-%#llx flags %#lx\n", 79 (unsigned long long) res->start, 80 (unsigned long long) res->end, res->flags); 81 } 82 for (i = 0; i < PNP_MAX_MEM; i++) { 83 res = pnp_get_resource(dev, IORESOURCE_MEM, i); 84 if (res && !(res->flags & IORESOURCE_UNSET)) 85 dev_dbg(&dev->dev, " mem %#llx-%#llx flags %#lx\n", 86 (unsigned long long) res->start, 87 (unsigned long long) res->end, res->flags); 88 } 89 #endif 90 } 91