kernel-ark/drivers/pnp/pnpacpi/core.c
Bjorn Helgaas 8f81dd1498 PNP: notice whether we have PNP devices (PNPBIOS or PNPACPI)
This series converts i386 and x86_64 legacy serial ports to be platform
devices and prevents probing for them if we have PNP.

This prevents double discovery, where a device was found both by the legacy
probe and by 8250_pnp.

This also prevents the serial driver from claiming IRDA devices (unless they
have a UART PNP ID).  The serial legacy probe sometimes assumed the wrong IRQ,
so the user had to use "setserial" to fix it.

Removing the need for setserial to make IRDA devices work seems good, but it
does break some things.  In particular, you may need to keep setserial from
poking legacy UART stuff back in by doing something like "dpkg-reconfigure
setserial" with the "kernel" option.  Otherwise, the setserial-discovered
"UART" will claim resources and prevent the IRDA driver from loading.

This patch:

If we can discover devices using PNP, we can skip some legacy probes.  This
flag ("pnp_platform_devices") indicates that PNPBIOS or PNPACPI is enabled and
should tell us about builtin devices.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Cc: Keith Owens <kaos@ocs.com.au>
Cc: Len Brown <lenb@kernel.org>
Cc: Adam Belay <ambx1@neo.rr.com>
Cc: Matthieu CASTET <castet.matthieu@free.fr>
Cc: Jean Tourrilhes <jt@hpl.hp.com>
Cc: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: Ville Syrjala <syrjala@sci.fi>
Cc: Russell King <rmk+serial@arm.linux.org.uk>
Cc: Samuel Ortiz <samuel@sortiz.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-08 11:15:23 -07:00

306 lines
7.9 KiB
C

/*
* pnpacpi -- PnP ACPI driver
*
* Copyright (c) 2004 Matthieu Castet <castet.matthieu@free.fr>
* Copyright (c) 2004 Li Shaohua <shaohua.li@intel.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/acpi.h>
#include <linux/pnp.h>
#include <acpi/acpi_bus.h>
#include "pnpacpi.h"
static int num = 0;
/* We need only to blacklist devices that have already an acpi driver that
* can't use pnp layer. We don't need to blacklist device that are directly
* used by the kernel (PCI root, ...), as it is harmless and there were
* already present in pnpbios. But there is an exception for devices that
* have irqs (PIC, Timer) because we call acpi_register_gsi.
* Finaly only devices that have a CRS method need to be in this list.
*/
static char __initdata excluded_id_list[] =
"PNP0C09," /* EC */
"PNP0C0F," /* Link device */
"PNP0000," /* PIC */
"PNP0100," /* Timer */
;
static inline int is_exclusive_device(struct acpi_device *dev)
{
return (!acpi_match_ids(dev, excluded_id_list));
}
/*
* Compatible Device IDs
*/
#define TEST_HEX(c) \
if (!(('0' <= (c) && (c) <= '9') || ('A' <= (c) && (c) <= 'F'))) \
return 0
#define TEST_ALPHA(c) \
if (!('@' <= (c) || (c) <= 'Z')) \
return 0
static int __init ispnpidacpi(char *id)
{
TEST_ALPHA(id[0]);
TEST_ALPHA(id[1]);
TEST_ALPHA(id[2]);
TEST_HEX(id[3]);
TEST_HEX(id[4]);
TEST_HEX(id[5]);
TEST_HEX(id[6]);
if (id[7] != '\0')
return 0;
return 1;
}
static void __init pnpidacpi_to_pnpid(char *id, char *str)
{
str[0] = id[0];
str[1] = id[1];
str[2] = id[2];
str[3] = tolower(id[3]);
str[4] = tolower(id[4]);
str[5] = tolower(id[5]);
str[6] = tolower(id[6]);
str[7] = '\0';
}
static int pnpacpi_get_resources(struct pnp_dev * dev, struct pnp_resource_table * res)
{
acpi_status status;
status = pnpacpi_parse_allocated_resource((acpi_handle)dev->data,
&dev->res);
return ACPI_FAILURE(status) ? -ENODEV : 0;
}
static int pnpacpi_set_resources(struct pnp_dev * dev, struct pnp_resource_table * res)
{
acpi_handle handle = dev->data;
struct acpi_buffer buffer;
int ret = 0;
acpi_status status;
ret = pnpacpi_build_resource_template(handle, &buffer);
if (ret)
return ret;
ret = pnpacpi_encode_resources(res, &buffer);
if (ret) {
kfree(buffer.pointer);
return ret;
}
status = acpi_set_current_resources(handle, &buffer);
if (ACPI_FAILURE(status))
ret = -EINVAL;
kfree(buffer.pointer);
return ret;
}
static int pnpacpi_disable_resources(struct pnp_dev *dev)
{
acpi_status status;
/* acpi_unregister_gsi(pnp_irq(dev, 0)); */
status = acpi_evaluate_object((acpi_handle)dev->data,
"_DIS", NULL, NULL);
return ACPI_FAILURE(status) ? -ENODEV : 0;
}
static struct pnp_protocol pnpacpi_protocol = {
.name = "Plug and Play ACPI",
.get = pnpacpi_get_resources,
.set = pnpacpi_set_resources,
.disable = pnpacpi_disable_resources,
};
static int __init pnpacpi_add_device(struct acpi_device *device)
{
acpi_handle temp = NULL;
acpi_status status;
struct pnp_id *dev_id;
struct pnp_dev *dev;
status = acpi_get_handle(device->handle, "_CRS", &temp);
if (ACPI_FAILURE(status) || !ispnpidacpi(acpi_device_hid(device)) ||
is_exclusive_device(device))
return 0;
pnp_dbg("ACPI device : hid %s", acpi_device_hid(device));
dev = kzalloc(sizeof(struct pnp_dev), GFP_KERNEL);
if (!dev) {
pnp_err("Out of memory");
return -ENOMEM;
}
dev->data = device->handle;
/* .enabled means if the device can decode the resources */
dev->active = device->status.enabled;
status = acpi_get_handle(device->handle, "_SRS", &temp);
if (ACPI_SUCCESS(status))
dev->capabilities |= PNP_CONFIGURABLE;
dev->capabilities |= PNP_READ;
if (device->flags.dynamic_status)
dev->capabilities |= PNP_WRITE;
if (device->flags.removable)
dev->capabilities |= PNP_REMOVABLE;
status = acpi_get_handle(device->handle, "_DIS", &temp);
if (ACPI_SUCCESS(status))
dev->capabilities |= PNP_DISABLE;
dev->protocol = &pnpacpi_protocol;
if (strlen(acpi_device_name(device)))
strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
else
strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
dev->number = num;
/* set the initial values for the PnP device */
dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
if (!dev_id)
goto err;
pnpidacpi_to_pnpid(acpi_device_hid(device), dev_id->id);
pnp_add_id(dev_id, dev);
if(dev->active) {
/* parse allocated resource */
status = pnpacpi_parse_allocated_resource(device->handle, &dev->res);
if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
pnp_err("PnPACPI: METHOD_NAME__CRS failure for %s", dev_id->id);
goto err1;
}
}
if(dev->capabilities & PNP_CONFIGURABLE) {
status = pnpacpi_parse_resource_option_data(device->handle,
dev);
if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
pnp_err("PnPACPI: METHOD_NAME__PRS failure for %s", dev_id->id);
goto err1;
}
}
/* parse compatible ids */
if (device->flags.compatible_ids) {
struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
int i;
for (i = 0; i < cid_list->count; i++) {
if (!ispnpidacpi(cid_list->id[i].value))
continue;
dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
if (!dev_id)
continue;
pnpidacpi_to_pnpid(cid_list->id[i].value, dev_id->id);
pnp_add_id(dev_id, dev);
}
}
/* clear out the damaged flags */
if (!dev->active)
pnp_init_resource_table(&dev->res);
pnp_add_device(dev);
num ++;
return AE_OK;
err1:
kfree(dev_id);
err:
kfree(dev);
return -EINVAL;
}
static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
u32 lvl, void *context, void **rv)
{
struct acpi_device *device;
if (!acpi_bus_get_device(handle, &device))
pnpacpi_add_device(device);
else
return AE_CTRL_DEPTH;
return AE_OK;
}
static int __init acpi_pnp_match(struct device *dev, void *_pnp)
{
struct acpi_device *acpi = to_acpi_device(dev);
struct pnp_dev *pnp = _pnp;
/* true means it matched */
return acpi->flags.hardware_id
&& !acpi_get_physical_device(acpi->handle)
&& compare_pnp_id(pnp->id, acpi->pnp.hardware_id);
}
static int __init acpi_pnp_find_device(struct device *dev, acpi_handle *handle)
{
struct device *adev;
struct acpi_device *acpi;
adev = bus_find_device(&acpi_bus_type, NULL,
to_pnp_dev(dev),
acpi_pnp_match);
if (!adev)
return -ENODEV;
acpi = to_acpi_device(adev);
*handle = acpi->handle;
put_device(adev);
return 0;
}
/* complete initialization of a PNPACPI device includes having
* pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
*/
static struct acpi_bus_type __initdata acpi_pnp_bus = {
.bus = &pnp_bus_type,
.find_device = acpi_pnp_find_device,
};
int pnpacpi_disabled __initdata;
static int __init pnpacpi_init(void)
{
if (acpi_disabled || pnpacpi_disabled) {
pnp_info("PnP ACPI: disabled");
return 0;
}
pnp_info("PnP ACPI init");
pnp_register_protocol(&pnpacpi_protocol);
register_acpi_bus_type(&acpi_pnp_bus);
acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
pnp_info("PnP ACPI: found %d devices", num);
unregister_acpi_bus_type(&acpi_pnp_bus);
pnp_platform_devices = 1;
return 0;
}
subsys_initcall(pnpacpi_init);
static int __init pnpacpi_setup(char *str)
{
if (str == NULL)
return 1;
if (!strncmp(str, "off", 3))
pnpacpi_disabled = 1;
return 1;
}
__setup("pnpacpi=", pnpacpi_setup);
#if 0
EXPORT_SYMBOL(pnpacpi_protocol);
#endif