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