120 lines
2.9 KiB
C
120 lines
2.9 KiB
C
/*
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* support.c - standard functions for the use of pnp protocol drivers
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*
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* Copyright 2003 Adam Belay <ambx1@neo.rr.com>
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*/
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#include <linux/module.h>
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#include <linux/ctype.h>
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#include <linux/pnp.h>
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#include "base.h"
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/**
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* pnp_is_active - Determines if a device is active based on its current
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* resources
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* @dev: pointer to the desired PnP device
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*/
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int pnp_is_active(struct pnp_dev *dev)
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{
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/*
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* I don't think this is very reliable because pnp_disable_dev()
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* only clears out auto-assigned resources.
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*/
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if (!pnp_port_start(dev, 0) && pnp_port_len(dev, 0) <= 1 &&
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!pnp_mem_start(dev, 0) && pnp_mem_len(dev, 0) <= 1 &&
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pnp_irq(dev, 0) == -1 && pnp_dma(dev, 0) == -1)
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return 0;
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else
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return 1;
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}
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EXPORT_SYMBOL(pnp_is_active);
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/*
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* Functionally similar to acpi_ex_eisa_id_to_string(), but that's
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* buried in the ACPI CA, and we can't depend on it being present.
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*/
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void pnp_eisa_id_to_string(u32 id, char *str)
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{
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id = be32_to_cpu(id);
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/*
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* According to the specs, the first three characters are five-bit
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* compressed ASCII, and the left-over high order bit should be zero.
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* However, the Linux ISAPNP code historically used six bits for the
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* first character, and there seem to be IDs that depend on that,
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* e.g., "nEC8241" in the Linux 8250_pnp serial driver and the
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* FreeBSD sys/pc98/cbus/sio_cbus.c driver.
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*/
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str[0] = 'A' + ((id >> 26) & 0x3f) - 1;
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str[1] = 'A' + ((id >> 21) & 0x1f) - 1;
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str[2] = 'A' + ((id >> 16) & 0x1f) - 1;
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str[3] = hex_asc_hi(id >> 8);
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str[4] = hex_asc_lo(id >> 8);
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str[5] = hex_asc_hi(id);
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str[6] = hex_asc_lo(id);
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str[7] = '\0';
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}
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char *pnp_resource_type_name(struct resource *res)
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{
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switch (pnp_resource_type(res)) {
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case IORESOURCE_IO:
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return "io";
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case IORESOURCE_MEM:
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return "mem";
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case IORESOURCE_IRQ:
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return "irq";
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case IORESOURCE_DMA:
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return "dma";
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}
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return NULL;
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}
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void dbg_pnp_show_resources(struct pnp_dev *dev, char *desc)
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{
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#ifdef DEBUG
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char buf[128];
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int len = 0;
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struct pnp_resource *pnp_res;
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struct resource *res;
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if (list_empty(&dev->resources)) {
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dev_dbg(&dev->dev, "%s: no current resources\n", desc);
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return;
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}
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dev_dbg(&dev->dev, "%s: current resources:\n", desc);
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list_for_each_entry(pnp_res, &dev->resources, list) {
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res = &pnp_res->res;
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len += snprintf(buf + len, sizeof(buf) - len, " %-3s ",
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pnp_resource_type_name(res));
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if (res->flags & IORESOURCE_DISABLED) {
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dev_dbg(&dev->dev, "%sdisabled\n", buf);
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continue;
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}
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switch (pnp_resource_type(res)) {
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case IORESOURCE_IO:
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case IORESOURCE_MEM:
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len += snprintf(buf + len, sizeof(buf) - len,
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"%#llx-%#llx flags %#lx",
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(unsigned long long) res->start,
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(unsigned long long) res->end,
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res->flags);
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break;
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case IORESOURCE_IRQ:
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case IORESOURCE_DMA:
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len += snprintf(buf + len, sizeof(buf) - len,
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"%lld flags %#lx",
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(unsigned long long) res->start,
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res->flags);
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break;
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}
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dev_dbg(&dev->dev, "%s\n", buf);
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}
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#endif
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}
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