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