drivers/pnp/pnpacpi/core.c - linux - Git at Google

 /*
  * 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 <linux/mod_devicetable.h>
 #include <acpi/acpi_bus.h>
 #include <acpi/actypes.h>

 #include "../base.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.
  * Finally, only devices that have a CRS method need to be in this list.
  */
 static struct acpi_device_id excluded_id_list[] __initdata = {
 	{"PNP0C09", 0},		/* EC */
 	{"PNP0C0F", 0},		/* Link device */
 	{"PNP0000", 0},		/* PIC */
 	{"PNP0100", 0},		/* Timer */
 	{"", 0},
 };

 static inline int __init is_exclusive_device(struct acpi_device *dev)
 {
 	return (!acpi_match_device_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 int pnpacpi_get_resources(struct pnp_dev *dev)
 {
 	dev_dbg(&dev->dev, "get resources\n");
 	return pnpacpi_parse_allocated_resource(dev);
 }

 static int pnpacpi_set_resources(struct pnp_dev *dev)
 {
 	acpi_handle handle = dev->data;
 	struct acpi_buffer buffer;
 	int ret;
 	acpi_status status;

 	dev_dbg(&dev->dev, "set resources\n");
 	ret = pnpacpi_build_resource_template(dev, &buffer);
 	if (ret)
 		return ret;
 	ret = pnpacpi_encode_resources(dev, &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;
 }

 #ifdef CONFIG_ACPI_SLEEP
 static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
 {
 	int power_state;

 	power_state = acpi_pm_device_sleep_state(&dev->dev, NULL);
 	if (power_state < 0)
 		power_state = (state.event == PM_EVENT_ON) ?
 				ACPI_STATE_D0 : ACPI_STATE_D3;

 	return acpi_bus_set_power((acpi_handle) dev->data, power_state);
 }

 static int pnpacpi_resume(struct pnp_dev *dev)
 {
 	return acpi_bus_set_power((acpi_handle) dev->data, ACPI_STATE_D0);
 }
 #endif

 static struct pnp_protocol pnpacpi_protocol = {
 	.name	 = "Plug and Play ACPI",
 	.get	 = pnpacpi_get_resources,
 	.set	 = pnpacpi_set_resources,
 	.disable = pnpacpi_disable_resources,
 #ifdef CONFIG_ACPI_SLEEP
 	.suspend = pnpacpi_suspend,
 	.resume = pnpacpi_resume,
 #endif
 };

 static int __init pnpacpi_add_device(struct acpi_device *device)
 {
 	acpi_handle temp = NULL;
 	acpi_status status;
 	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;

 	dev = pnp_alloc_dev(&pnpacpi_protocol, num, acpi_device_hid(device));
 	if (!dev)
 		return -ENOMEM;

 	dev->data = device->handle;
 	/* .enabled means 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_CONFIGURABLE))
 		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;

 	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));

 	if (dev->active)
 		pnpacpi_parse_allocated_resource(dev);

 	if (dev->capabilities & PNP_CONFIGURABLE)
 		pnpacpi_parse_resource_option_data(dev);

 	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;
 			pnp_add_id(dev, cid_list->id[i].value);
 		}
 	}

 	/* clear out the damaged flags */
 	if (!dev->active)
 		pnp_init_resources(dev);
 	pnp_add_device(dev);
 	num++;

 	return AE_OK;
 }

 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;
 }

 fs_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);
	/*
	* 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 <linux/mod_devicetable.h>
	#include <acpi/acpi_bus.h>
	#include <acpi/actypes.h>

	#include "../base.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.
	* Finally, only devices that have a CRS method need to be in this list.
	*/
	static struct acpi_device_id excluded_id_list[] __initdata = {
	{"PNP0C09", 0}, /* EC */
	{"PNP0C0F", 0}, /* Link device */
	{"PNP0000", 0}, /* PIC */
	{"PNP0100", 0}, /* Timer */
	{"", 0},
	};

	static inline int __init is_exclusive_device(struct acpi_device *dev)
	{
	return (!acpi_match_device_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 int pnpacpi_get_resources(struct pnp_dev *dev)
	{
	dev_dbg(&dev->dev, "get resources\n");
	return pnpacpi_parse_allocated_resource(dev);
	}

	static int pnpacpi_set_resources(struct pnp_dev *dev)
	{
	acpi_handle handle = dev->data;
	struct acpi_buffer buffer;
	int ret;
	acpi_status status;

	dev_dbg(&dev->dev, "set resources\n");
	ret = pnpacpi_build_resource_template(dev, &buffer);
	if (ret)
	return ret;
	ret = pnpacpi_encode_resources(dev, &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;
	}

	#ifdef CONFIG_ACPI_SLEEP
	static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
	{
	int power_state;

	power_state = acpi_pm_device_sleep_state(&dev->dev, NULL);
	if (power_state < 0)
	power_state = (state.event == PM_EVENT_ON) ?
	ACPI_STATE_D0 : ACPI_STATE_D3;

	return acpi_bus_set_power((acpi_handle) dev->data, power_state);
	}

	static int pnpacpi_resume(struct pnp_dev *dev)
	{
	return acpi_bus_set_power((acpi_handle) dev->data, ACPI_STATE_D0);
	}
	#endif

	static struct pnp_protocol pnpacpi_protocol = {
	.name = "Plug and Play ACPI",
	.get = pnpacpi_get_resources,
	.set = pnpacpi_set_resources,
	.disable = pnpacpi_disable_resources,
	#ifdef CONFIG_ACPI_SLEEP
	.suspend = pnpacpi_suspend,
	.resume = pnpacpi_resume,
	#endif
	};

	static int __init pnpacpi_add_device(struct acpi_device *device)
	{
	acpi_handle temp = NULL;
	acpi_status status;
	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;

	dev = pnp_alloc_dev(&pnpacpi_protocol, num, acpi_device_hid(device));
	if (!dev)
	return -ENOMEM;

	dev->data = device->handle;
	/* .enabled means 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_CONFIGURABLE))
	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;

	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));

	if (dev->active)
	pnpacpi_parse_allocated_resource(dev);

	if (dev->capabilities & PNP_CONFIGURABLE)
	pnpacpi_parse_resource_option_data(dev);

	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;
	pnp_add_id(dev, cid_list->id[i].value);
	}
	}

	/* clear out the damaged flags */
	if (!dev->active)
	pnp_init_resources(dev);
	pnp_add_device(dev);
	num++;

	return AE_OK;
	}

	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;
	}

	fs_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);