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Commit c2efefb3 authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

ACPI / scan: Move sysfs-related device code to a separate file 



To reduce the size of scan.c and improve the readability of it, move
all code related to device sysfs, modalias creation etc. to a new
file called device_sysfs.c.

Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 21bdb584

drivers/acpi/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -24,7 +24,7 @@ acpi-y += nvs.o 
# Power management related files

acpi-y				+= wakeup.o

acpi-$(CONFIG_ACPI_SYSTEM_POWER_STATES_SUPPORT) += sleep.o

acpi-y				+= device_pm.o

acpi-y				+= device_sysfs.o device_pm.o

acpi-$(CONFIG_ACPI_SLEEP)	+= proc.o

drivers/acpi/device_sysfs.c

0 → 100644
+521 −0
Original line number Diff line number Diff line 
/*

 * drivers/acpi/device_sysfs.c - ACPI device sysfs attributes and modalias.

 *

 * Copyright (C) 2015, Intel Corp.

 * Author: Mika Westerberg <mika.westerberg@linux.intel.com>

 * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

 *

 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 *

 *  This program is free software; you can redistribute it and/or modify

 *  it under the terms of the GNU General Public License version 2 as published

 *  by the Free Software Foundation.

 *

 *  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.

 *

 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 */



#include <linux/acpi.h>

#include <linux/device.h>

#include <linux/export.h>

#include <linux/nls.h>



#include "internal.h"



/**

 * create_pnp_modalias - Create hid/cid(s) string for modalias and uevent

 * @acpi_dev: ACPI device object.

 * @modalias: Buffer to print into.

 * @size: Size of the buffer.

 *

 * Creates hid/cid(s) string needed for modalias and uevent

 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:

 * char *modalias: "acpi:IBM0001:ACPI0001"

 * Return: 0: no _HID and no _CID

 *         -EINVAL: output error

 *         -ENOMEM: output is truncated

*/

static int create_pnp_modalias(struct acpi_device *acpi_dev, char *modalias,

			       int size)

{

	int len;

	int count;

	struct acpi_hardware_id *id;



	/*

	 * Since we skip ACPI_DT_NAMESPACE_HID from the modalias below, 0 should

	 * be returned if ACPI_DT_NAMESPACE_HID is the only ACPI/PNP ID in the

	 * device's list.

	 */

	count = 0;

	list_for_each_entry(id, &acpi_dev->pnp.ids, list)

		if (strcmp(id->id, ACPI_DT_NAMESPACE_HID))

			count++;



	if (!count)

		return 0;



	len = snprintf(modalias, size, "acpi:");

	if (len <= 0)

		return len;



	size -= len;



	list_for_each_entry(id, &acpi_dev->pnp.ids, list) {

		if (!strcmp(id->id, ACPI_DT_NAMESPACE_HID))

			continue;



		count = snprintf(&modalias[len], size, "%s:", id->id);

		if (count < 0)

			return -EINVAL;



		if (count >= size)

			return -ENOMEM;



		len += count;

		size -= count;

	}

	modalias[len] = '\0';

	return len;

}



/**

 * create_of_modalias - Creates DT compatible string for modalias and uevent

 * @acpi_dev: ACPI device object.

 * @modalias: Buffer to print into.

 * @size: Size of the buffer.

 *

 * Expose DT compatible modalias as of:NnameTCcompatible.  This function should

 * only be called for devices having ACPI_DT_NAMESPACE_HID in their list of

 * ACPI/PNP IDs.

 */

static int create_of_modalias(struct acpi_device *acpi_dev, char *modalias,

			      int size)

{

	struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };

	const union acpi_object *of_compatible, *obj;

	int len, count;

	int i, nval;

	char *c;



	acpi_get_name(acpi_dev->handle, ACPI_SINGLE_NAME, &buf);

	/* DT strings are all in lower case */

	for (c = buf.pointer; *c != '\0'; c++)

		*c = tolower(*c);



	len = snprintf(modalias, size, "of:N%sT", (char *)buf.pointer);

	ACPI_FREE(buf.pointer);



	if (len <= 0)

		return len;



	of_compatible = acpi_dev->data.of_compatible;

	if (of_compatible->type == ACPI_TYPE_PACKAGE) {

		nval = of_compatible->package.count;

		obj = of_compatible->package.elements;

	} else { /* Must be ACPI_TYPE_STRING. */

		nval = 1;

		obj = of_compatible;

	}

	for (i = 0; i < nval; i++, obj++) {

		count = snprintf(&modalias[len], size, "C%s",

				 obj->string.pointer);

		if (count < 0)

			return -EINVAL;



		if (count >= size)

			return -ENOMEM;



		len += count;

		size -= count;

	}

	modalias[len] = '\0';

	return len;

}



int __acpi_device_uevent_modalias(struct acpi_device *adev,

				  struct kobj_uevent_env *env)

{

	int len;



	if (!adev)

		return -ENODEV;



	if (list_empty(&adev->pnp.ids))

		return 0;



	if (add_uevent_var(env, "MODALIAS="))

		return -ENOMEM;



	len = create_pnp_modalias(adev, &env->buf[env->buflen - 1],

				  sizeof(env->buf) - env->buflen);

	if (len < 0)

		return len;



	env->buflen += len;

	if (!adev->data.of_compatible)

		return 0;



	if (len > 0 && add_uevent_var(env, "MODALIAS="))

		return -ENOMEM;



	len = create_of_modalias(adev, &env->buf[env->buflen - 1],

				 sizeof(env->buf) - env->buflen);

	if (len < 0)

		return len;



	env->buflen += len;



	return 0;

}



/**

 * acpi_device_uevent_modalias - uevent modalias for ACPI-enumerated devices.

 *

 * Create the uevent modalias field for ACPI-enumerated devices.

 *

 * Because other buses do not support ACPI HIDs & CIDs, e.g. for a device with

 * hid:IBM0001 and cid:ACPI0001 you get: "acpi:IBM0001:ACPI0001".

 */

int acpi_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env)

{

	return __acpi_device_uevent_modalias(acpi_companion_match(dev), env);

}

EXPORT_SYMBOL_GPL(acpi_device_uevent_modalias);



static int __acpi_device_modalias(struct acpi_device *adev, char *buf, int size)

{

	int len, count;



	if (!adev)

		return -ENODEV;



	if (list_empty(&adev->pnp.ids))

		return 0;



	len = create_pnp_modalias(adev, buf, size - 1);

	if (len < 0) {

		return len;

	} else if (len > 0) {

		buf[len++] = '\n';

		size -= len;

	}

	if (!adev->data.of_compatible)

		return len;



	count = create_of_modalias(adev, buf + len, size - 1);

	if (count < 0) {

		return count;

	} else if (count > 0) {

		len += count;

		buf[len++] = '\n';

	}



	return len;

}



/**

 * acpi_device_modalias - modalias sysfs attribute for ACPI-enumerated devices.

 *

 * Create the modalias sysfs attribute for ACPI-enumerated devices.

 *

 * Because other buses do not support ACPI HIDs & CIDs, e.g. for a device with

 * hid:IBM0001 and cid:ACPI0001 you get: "acpi:IBM0001:ACPI0001".

 */

int acpi_device_modalias(struct device *dev, char *buf, int size)

{

	return __acpi_device_modalias(acpi_companion_match(dev), buf, size);

}

EXPORT_SYMBOL_GPL(acpi_device_modalias);



static ssize_t

acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {

	return __acpi_device_modalias(to_acpi_device(dev), buf, 1024);

}

static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);



static ssize_t real_power_state_show(struct device *dev,

				     struct device_attribute *attr, char *buf)

{

	struct acpi_device *adev = to_acpi_device(dev);

	int state;

	int ret;



	ret = acpi_device_get_power(adev, &state);

	if (ret)

		return ret;



	return sprintf(buf, "%s\n", acpi_power_state_string(state));

}



static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);



static ssize_t power_state_show(struct device *dev,

				struct device_attribute *attr, char *buf)

{

	struct acpi_device *adev = to_acpi_device(dev);



	return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));

}



static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);



static ssize_t

acpi_eject_store(struct device *d, struct device_attribute *attr,

		const char *buf, size_t count)

{

	struct acpi_device *acpi_device = to_acpi_device(d);

	acpi_object_type not_used;

	acpi_status status;



	if (!count || buf[0] != '1')

		return -EINVAL;



	if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled)

	    && !acpi_device->driver)

		return -ENODEV;



	status = acpi_get_type(acpi_device->handle, &not_used);

	if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable)

		return -ENODEV;



	get_device(&acpi_device->dev);

	status = acpi_hotplug_schedule(acpi_device, ACPI_OST_EC_OSPM_EJECT);

	if (ACPI_SUCCESS(status))

		return count;



	put_device(&acpi_device->dev);

	acpi_evaluate_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT,

			  ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);

	return status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;

}



static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);



static ssize_t

acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {

	struct acpi_device *acpi_dev = to_acpi_device(dev);



	return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));

}

static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);



static ssize_t acpi_device_uid_show(struct device *dev,

				    struct device_attribute *attr, char *buf)

{

	struct acpi_device *acpi_dev = to_acpi_device(dev);



	return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);

}

static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);



static ssize_t acpi_device_adr_show(struct device *dev,

				    struct device_attribute *attr, char *buf)

{

	struct acpi_device *acpi_dev = to_acpi_device(dev);



	return sprintf(buf, "0x%08x\n",

		       (unsigned int)(acpi_dev->pnp.bus_address));

}

static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);



static ssize_t

acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {

	struct acpi_device *acpi_dev = to_acpi_device(dev);

	struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};

	int result;



	result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);

	if (result)

		goto end;



	result = sprintf(buf, "%s\n", (char*)path.pointer);

	kfree(path.pointer);

end:

	return result;

}

static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);



/* sysfs file that shows description text from the ACPI _STR method */

static ssize_t description_show(struct device *dev,

				struct device_attribute *attr,

				char *buf) {

	struct acpi_device *acpi_dev = to_acpi_device(dev);

	int result;



	if (acpi_dev->pnp.str_obj == NULL)

		return 0;



	/*

	 * The _STR object contains a Unicode identifier for a device.

	 * We need to convert to utf-8 so it can be displayed.

	 */

	result = utf16s_to_utf8s(

		(wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,

		acpi_dev->pnp.str_obj->buffer.length,

		UTF16_LITTLE_ENDIAN, buf,

		PAGE_SIZE);



	buf[result++] = '\n';



	return result;

}

static DEVICE_ATTR(description, 0444, description_show, NULL);



static ssize_t

acpi_device_sun_show(struct device *dev, struct device_attribute *attr,

		     char *buf) {

	struct acpi_device *acpi_dev = to_acpi_device(dev);

	acpi_status status;

	unsigned long long sun;



	status = acpi_evaluate_integer(acpi_dev->handle, "_SUN", NULL, &sun);

	if (ACPI_FAILURE(status))

		return -ENODEV;



	return sprintf(buf, "%llu\n", sun);

}

static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);



static ssize_t status_show(struct device *dev, struct device_attribute *attr,

				char *buf) {

	struct acpi_device *acpi_dev = to_acpi_device(dev);

	acpi_status status;

	unsigned long long sta;



	status = acpi_evaluate_integer(acpi_dev->handle, "_STA", NULL, &sta);

	if (ACPI_FAILURE(status))

		return -ENODEV;



	return sprintf(buf, "%llu\n", sta);

}

static DEVICE_ATTR_RO(status);



/**

 * acpi_device_setup_files - Create sysfs attributes of an ACPI device.

 * @dev: ACPI device object.

 */

int acpi_device_setup_files(struct acpi_device *dev)

{

	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};

	acpi_status status;

	int result = 0;



	/*

	 * Devices gotten from FADT don't have a "path" attribute

	 */

	if (dev->handle) {

		result = device_create_file(&dev->dev, &dev_attr_path);

		if (result)

			goto end;

	}



	if (!list_empty(&dev->pnp.ids)) {

		result = device_create_file(&dev->dev, &dev_attr_hid);

		if (result)

			goto end;



		result = device_create_file(&dev->dev, &dev_attr_modalias);

		if (result)

			goto end;

	}



	/*

	 * If device has _STR, 'description' file is created

	 */

	if (acpi_has_method(dev->handle, "_STR")) {

		status = acpi_evaluate_object(dev->handle, "_STR",

					NULL, &buffer);

		if (ACPI_FAILURE(status))

			buffer.pointer = NULL;

		dev->pnp.str_obj = buffer.pointer;

		result = device_create_file(&dev->dev, &dev_attr_description);

		if (result)

			goto end;

	}



	if (dev->pnp.type.bus_address)

		result = device_create_file(&dev->dev, &dev_attr_adr);

	if (dev->pnp.unique_id)

		result = device_create_file(&dev->dev, &dev_attr_uid);



	if (acpi_has_method(dev->handle, "_SUN")) {

		result = device_create_file(&dev->dev, &dev_attr_sun);

		if (result)

			goto end;

	}



	if (acpi_has_method(dev->handle, "_STA")) {

		result = device_create_file(&dev->dev, &dev_attr_status);

		if (result)

			goto end;

	}



        /*

         * If device has _EJ0, 'eject' file is created that is used to trigger

         * hot-removal function from userland.

         */

	if (acpi_has_method(dev->handle, "_EJ0")) {

		result = device_create_file(&dev->dev, &dev_attr_eject);

		if (result)

			return result;

	}



	if (dev->flags.power_manageable) {

		result = device_create_file(&dev->dev, &dev_attr_power_state);

		if (result)

			return result;



		if (dev->power.flags.power_resources)

			result = device_create_file(&dev->dev,

						    &dev_attr_real_power_state);

	}



end:

	return result;

}



/**

 * acpi_device_remove_files - Remove sysfs attributes of an ACPI device.

 * @dev: ACPI device object.

 */

void acpi_device_remove_files(struct acpi_device *dev)

{

	if (dev->flags.power_manageable) {

		device_remove_file(&dev->dev, &dev_attr_power_state);

		if (dev->power.flags.power_resources)

			device_remove_file(&dev->dev,

					   &dev_attr_real_power_state);

	}



	/*

	 * If device has _STR, remove 'description' file

	 */

	if (acpi_has_method(dev->handle, "_STR")) {

		kfree(dev->pnp.str_obj);

		device_remove_file(&dev->dev, &dev_attr_description);

	}

	/*

	 * If device has _EJ0, remove 'eject' file.

	 */

	if (acpi_has_method(dev->handle, "_EJ0"))

		device_remove_file(&dev->dev, &dev_attr_eject);



	if (acpi_has_method(dev->handle, "_SUN"))

		device_remove_file(&dev->dev, &dev_attr_sun);



	if (dev->pnp.unique_id)

		device_remove_file(&dev->dev, &dev_attr_uid);

	if (dev->pnp.type.bus_address)

		device_remove_file(&dev->dev, &dev_attr_adr);

	device_remove_file(&dev->dev, &dev_attr_modalias);

	device_remove_file(&dev->dev, &dev_attr_hid);

	if (acpi_has_method(dev->handle, "_STA"))

		device_remove_file(&dev->dev, &dev_attr_status);

	if (dev->handle)

		device_remove_file(&dev->dev, &dev_attr_path);

}

drivers/acpi/internal.h

+9 −0
Original line number Diff line number Diff line
@@ -93,11 +93,20 @@ int acpi_device_add(struct acpi_device *device, 
		    void (*release)(struct device *));

void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,

			     int type, unsigned long long sta);

int acpi_device_setup_files(struct acpi_device *dev);

void acpi_device_remove_files(struct acpi_device *dev);

void acpi_device_add_finalize(struct acpi_device *device);

void acpi_free_pnp_ids(struct acpi_device_pnp *pnp);

bool acpi_device_is_present(struct acpi_device *adev);

bool acpi_device_is_battery(struct acpi_device *adev);



/* --------------------------------------------------------------------------

                     Device Matching and Notification

   -------------------------------------------------------------------------- */

struct acpi_device *acpi_companion_match(const struct device *dev);

int __acpi_device_uevent_modalias(struct acpi_device *adev,

				  struct kobj_uevent_env *env);



/* --------------------------------------------------------------------------

                                  Power Resource

   -------------------------------------------------------------------------- */

drivers/acpi/scan.c

+1 −482

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