335 lines
8.5 KiB
C
335 lines
8.5 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 <linux/mod_devicetable.h>
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#include <acpi/acpi_bus.h>
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#include <acpi/actypes.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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* Finally, only devices that have a CRS method need to be in this list.
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*/
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static struct __initdata acpi_device_id excluded_id_list[] = {
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{"PNP0C09", 0}, /* EC */
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{"PNP0C0F", 0}, /* Link device */
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{"PNP0000", 0}, /* PIC */
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{"PNP0100", 0}, /* Timer */
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{"", 0},
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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_device_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,
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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,
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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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#ifdef CONFIG_ACPI_SLEEP
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static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
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{
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return acpi_bus_set_power((acpi_handle) dev->data,
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acpi_pm_device_sleep_state(&dev->dev,
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device_may_wakeup
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(&dev->dev),
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NULL));
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}
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static int pnpacpi_resume(struct pnp_dev *dev)
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{
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return acpi_bus_set_power((acpi_handle) dev->data, ACPI_STATE_D0);
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}
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#endif
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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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#ifdef CONFIG_ACPI_SLEEP
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.suspend = pnpacpi_suspend,
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.resume = pnpacpi_resume,
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#endif
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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 = kzalloc(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 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 = kzalloc(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,
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&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",
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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",
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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 = kzalloc(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,
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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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static int __init acpi_pnp_match(struct device *dev, void *_pnp)
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{
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struct acpi_device *acpi = to_acpi_device(dev);
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struct pnp_dev *pnp = _pnp;
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/* true means it matched */
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return acpi->flags.hardware_id
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&& !acpi_get_physical_device(acpi->handle)
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&& compare_pnp_id(pnp->id, acpi->pnp.hardware_id);
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}
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static int __init acpi_pnp_find_device(struct device *dev, acpi_handle * handle)
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{
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struct device *adev;
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struct acpi_device *acpi;
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adev = bus_find_device(&acpi_bus_type, NULL,
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to_pnp_dev(dev), acpi_pnp_match);
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if (!adev)
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return -ENODEV;
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acpi = to_acpi_device(adev);
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*handle = acpi->handle;
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put_device(adev);
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return 0;
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}
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/* complete initialization of a PNPACPI device includes having
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* pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
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*/
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static struct acpi_bus_type __initdata acpi_pnp_bus = {
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.bus = &pnp_bus_type,
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.find_device = acpi_pnp_find_device,
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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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register_acpi_bus_type(&acpi_pnp_bus);
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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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unregister_acpi_bus_type(&acpi_pnp_bus);
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pnp_platform_devices = 1;
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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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