drivers/thermal/int340x_thermal/int3400_thermal.c - arm/linux - Git at Google

 /*
  * INT3400 thermal driver
  *
  * Copyright (C) 2014, Intel Corporation
  * Authors: Zhang Rui <rui.zhang@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.
  *
  */

 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/acpi.h>
 #include <linux/thermal.h>
 #include "acpi_thermal_rel.h"

 #define INT3400_THERMAL_TABLE_CHANGED 0x83

 enum int3400_thermal_uuid {
 	INT3400_THERMAL_PASSIVE_1,
 	INT3400_THERMAL_ACTIVE,
 	INT3400_THERMAL_CRITICAL,
 	INT3400_THERMAL_MAXIMUM_UUID,
 };

 static char *int3400_thermal_uuids[INT3400_THERMAL_MAXIMUM_UUID] = {
 	"42A441D6-AE6A-462b-A84B-4A8CE79027D3",
 	"3A95C389-E4B8-4629-A526-C52C88626BAE",
 	"97C68AE7-15FA-499c-B8C9-5DA81D606E0A",
 };

 struct int3400_thermal_priv {
 	struct acpi_device *adev;
 	struct thermal_zone_device *thermal;
 	int mode;
 	int art_count;
 	struct art *arts;
 	int trt_count;
 	struct trt *trts;
 	u8 uuid_bitmap;
 	int rel_misc_dev_res;
 	int current_uuid_index;
 };

 static ssize_t available_uuids_show(struct device *dev,
 				    struct device_attribute *attr,
 				    char *buf)
 {
 	struct platform_device *pdev = to_platform_device(dev);
 	struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
 	int i;
 	int length = 0;

 	for (i = 0; i < INT3400_THERMAL_MAXIMUM_UUID; i++) {
 		if (priv->uuid_bitmap & (1 << i))
 			if (PAGE_SIZE - length > 0)
 				length += snprintf(&buf[length],
 						   PAGE_SIZE - length,
 						   "%s\n",
 						   int3400_thermal_uuids[i]);
 	}

 	return length;
 }

 static ssize_t current_uuid_show(struct device *dev,
 				 struct device_attribute *devattr, char *buf)
 {
 	struct platform_device *pdev = to_platform_device(dev);
 	struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);

 	if (priv->uuid_bitmap & (1 << priv->current_uuid_index))
 		return sprintf(buf, "%s\n",
 			       int3400_thermal_uuids[priv->current_uuid_index]);
 	else
 		return sprintf(buf, "INVALID\n");
 }

 static ssize_t current_uuid_store(struct device *dev,
 				  struct device_attribute *attr,
 				  const char *buf, size_t count)
 {
 	struct platform_device *pdev = to_platform_device(dev);
 	struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
 	int i;

 	for (i = 0; i < INT3400_THERMAL_MAXIMUM_UUID; ++i) {
 		if ((priv->uuid_bitmap & (1 << i)) &&
 		    !(strncmp(buf, int3400_thermal_uuids[i],
 			      sizeof(int3400_thermal_uuids[i]) - 1))) {
 			priv->current_uuid_index = i;
 			return count;
 		}
 	}

 	return -EINVAL;
 }

 static DEVICE_ATTR_RW(current_uuid);
 static DEVICE_ATTR_RO(available_uuids);
 static struct attribute *uuid_attrs[] = {
 	&dev_attr_available_uuids.attr,
 	&dev_attr_current_uuid.attr,
 	NULL
 };

 static const struct attribute_group uuid_attribute_group = {
 	.attrs = uuid_attrs,
 	.name = "uuids"
 };

 static int int3400_thermal_get_uuids(struct int3400_thermal_priv *priv)
 {
 	struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL};
 	union acpi_object *obja, *objb;
 	int i, j;
 	int result = 0;
 	acpi_status status;

 	status = acpi_evaluate_object(priv->adev->handle, "IDSP", NULL, &buf);
 	if (ACPI_FAILURE(status))
 		return -ENODEV;

 	obja = (union acpi_object *)buf.pointer;
 	if (obja->type != ACPI_TYPE_PACKAGE) {
 		result = -EINVAL;
 		goto end;
 	}

 	for (i = 0; i < obja->package.count; i++) {
 		objb = &obja->package.elements[i];
 		if (objb->type != ACPI_TYPE_BUFFER) {
 			result = -EINVAL;
 			goto end;
 		}

 		/* UUID must be 16 bytes */
 		if (objb->buffer.length != 16) {
 			result = -EINVAL;
 			goto end;
 		}

 		for (j = 0; j < INT3400_THERMAL_MAXIMUM_UUID; j++) {
 			guid_t guid;

 			guid_parse(int3400_thermal_uuids[j], &guid);
 			if (guid_equal((guid_t *)objb->buffer.pointer, &guid)) {
 				priv->uuid_bitmap |= (1 << j);
 				break;
 			}
 		}
 	}

 end:
 	kfree(buf.pointer);
 	return result;
 }

 static int int3400_thermal_run_osc(acpi_handle handle,
 				enum int3400_thermal_uuid uuid, bool enable)
 {
 	u32 ret, buf[2];
 	acpi_status status;
 	int result = 0;
 	struct acpi_osc_context context = {
 		.uuid_str = int3400_thermal_uuids[uuid],
 		.rev = 1,
 		.cap.length = 8,
 	};

 	buf[OSC_QUERY_DWORD] = 0;
 	buf[OSC_SUPPORT_DWORD] = enable;

 	context.cap.pointer = buf;

 	status = acpi_run_osc(handle, &context);
 	if (ACPI_SUCCESS(status)) {
 		ret = *((u32 *)(context.ret.pointer + 4));
 		if (ret != enable)
 			result = -EPERM;
 	} else
 		result = -EPERM;

 	kfree(context.ret.pointer);
 	return result;
 }

 static void int3400_notify(acpi_handle handle,
 			u32 event,
 			void *data)
 {
 	struct int3400_thermal_priv *priv = data;
 	char *thermal_prop[5];

 	if (!priv)
 		return;

 	switch (event) {
 	case INT3400_THERMAL_TABLE_CHANGED:
 		thermal_prop[0] = kasprintf(GFP_KERNEL, "NAME=%s",
 				priv->thermal->type);
 		thermal_prop[1] = kasprintf(GFP_KERNEL, "TEMP=%d",
 				priv->thermal->temperature);
 		thermal_prop[2] = kasprintf(GFP_KERNEL, "TRIP=");
 		thermal_prop[3] = kasprintf(GFP_KERNEL, "EVENT=%d",
 				THERMAL_TABLE_CHANGED);
 		thermal_prop[4] = NULL;
 		kobject_uevent_env(&priv->thermal->device.kobj, KOBJ_CHANGE,
 				thermal_prop);
 		break;
 	default:
 		dev_err(&priv->adev->dev, "Unsupported event [0x%x]\n", event);
 		break;
 	}
 }

 static int int3400_thermal_get_temp(struct thermal_zone_device *thermal,
 			int *temp)
 {
 	*temp = 20 * 1000; /* faked temp sensor with 20C */
 	return 0;
 }

 static int int3400_thermal_get_mode(struct thermal_zone_device *thermal,
 				enum thermal_device_mode *mode)
 {
 	struct int3400_thermal_priv *priv = thermal->devdata;

 	if (!priv)
 		return -EINVAL;

 	*mode = priv->mode;

 	return 0;
 }

 static int int3400_thermal_set_mode(struct thermal_zone_device *thermal,
 				enum thermal_device_mode mode)
 {
 	struct int3400_thermal_priv *priv = thermal->devdata;
 	bool enable;
 	int result = 0;

 	if (!priv)
 		return -EINVAL;

 	if (mode == THERMAL_DEVICE_ENABLED)
 		enable = true;
 	else if (mode == THERMAL_DEVICE_DISABLED)
 		enable = false;
 	else
 		return -EINVAL;

 	if (enable != priv->mode) {
 		priv->mode = enable;
 		result = int3400_thermal_run_osc(priv->adev->handle,
 						 priv->current_uuid_index,
 						 enable);
 	}
 	return result;
 }

 static struct thermal_zone_device_ops int3400_thermal_ops = {
 	.get_temp = int3400_thermal_get_temp,
 };

 static struct thermal_zone_params int3400_thermal_params = {
 	.governor_name = "user_space",
 	.no_hwmon = true,
 };

 static int int3400_thermal_probe(struct platform_device *pdev)
 {
 	struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
 	struct int3400_thermal_priv *priv;
 	int result;

 	if (!adev)
 		return -ENODEV;

 	priv = kzalloc(sizeof(struct int3400_thermal_priv), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;

 	priv->adev = adev;

 	result = int3400_thermal_get_uuids(priv);
 	if (result)
 		goto free_priv;

 	result = acpi_parse_art(priv->adev->handle, &priv->art_count,
 				&priv->arts, true);
 	if (result)
 		dev_dbg(&pdev->dev, "_ART table parsing error\n");

 	result = acpi_parse_trt(priv->adev->handle, &priv->trt_count,
 				&priv->trts, true);
 	if (result)
 		dev_dbg(&pdev->dev, "_TRT table parsing error\n");

 	platform_set_drvdata(pdev, priv);

 	if (priv->uuid_bitmap & 1 << INT3400_THERMAL_PASSIVE_1) {
 		int3400_thermal_ops.get_mode = int3400_thermal_get_mode;
 		int3400_thermal_ops.set_mode = int3400_thermal_set_mode;
 	}
 	priv->thermal = thermal_zone_device_register("INT3400 Thermal", 0, 0,
 						priv, &int3400_thermal_ops,
 						&int3400_thermal_params, 0, 0);
 	if (IS_ERR(priv->thermal)) {
 		result = PTR_ERR(priv->thermal);
 		goto free_art_trt;
 	}

 	priv->rel_misc_dev_res = acpi_thermal_rel_misc_device_add(
 							priv->adev->handle);

 	result = sysfs_create_group(&pdev->dev.kobj, &uuid_attribute_group);
 	if (result)
 		goto free_zone;

 	result = acpi_install_notify_handler(
 			priv->adev->handle, ACPI_DEVICE_NOTIFY, int3400_notify,
 			(void *)priv);
 	if (result)
 		goto free_zone;

 	return 0;

 free_zone:
 	thermal_zone_device_unregister(priv->thermal);
 free_art_trt:
 	kfree(priv->trts);
 	kfree(priv->arts);
 free_priv:
 	kfree(priv);
 	return result;
 }

 static int int3400_thermal_remove(struct platform_device *pdev)
 {
 	struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);

 	acpi_remove_notify_handler(
 			priv->adev->handle, ACPI_DEVICE_NOTIFY,
 			int3400_notify);

 	if (!priv->rel_misc_dev_res)
 		acpi_thermal_rel_misc_device_remove(priv->adev->handle);

 	sysfs_remove_group(&pdev->dev.kobj, &uuid_attribute_group);
 	thermal_zone_device_unregister(priv->thermal);
 	kfree(priv->trts);
 	kfree(priv->arts);
 	kfree(priv);
 	return 0;
 }

 static const struct acpi_device_id int3400_thermal_match[] = {
 	{"INT3400", 0},
 	{}
 };

 MODULE_DEVICE_TABLE(acpi, int3400_thermal_match);

 static struct platform_driver int3400_thermal_driver = {
 	.probe = int3400_thermal_probe,
 	.remove = int3400_thermal_remove,
 	.driver = {
 		   .name = "int3400 thermal",
 		   .acpi_match_table = ACPI_PTR(int3400_thermal_match),
 		   },
 };

 module_platform_driver(int3400_thermal_driver);

 MODULE_DESCRIPTION("INT3400 Thermal driver");
 MODULE_AUTHOR("Zhang Rui <rui.zhang@intel.com>");
 MODULE_LICENSE("GPL");
	/*
	* INT3400 thermal driver
	*
	* Copyright (C) 2014, Intel Corporation
	* Authors: Zhang Rui <rui.zhang@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.
	*
	*/

	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/acpi.h>
	#include <linux/thermal.h>
	#include "acpi_thermal_rel.h"

	#define INT3400_THERMAL_TABLE_CHANGED 0x83

	enum int3400_thermal_uuid {
	INT3400_THERMAL_PASSIVE_1,
	INT3400_THERMAL_ACTIVE,
	INT3400_THERMAL_CRITICAL,
	INT3400_THERMAL_MAXIMUM_UUID,
	};

	static char *int3400_thermal_uuids[INT3400_THERMAL_MAXIMUM_UUID] = {
	"42A441D6-AE6A-462b-A84B-4A8CE79027D3",
	"3A95C389-E4B8-4629-A526-C52C88626BAE",
	"97C68AE7-15FA-499c-B8C9-5DA81D606E0A",
	};

	struct int3400_thermal_priv {
	struct acpi_device *adev;
	struct thermal_zone_device *thermal;
	int mode;
	int art_count;
	struct art *arts;
	int trt_count;
	struct trt *trts;
	u8 uuid_bitmap;
	int rel_misc_dev_res;
	int current_uuid_index;
	};

	static ssize_t available_uuids_show(struct device *dev,
	struct device_attribute *attr,
	char *buf)
	{
	struct platform_device *pdev = to_platform_device(dev);
	struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
	int i;
	int length = 0;

	for (i = 0; i < INT3400_THERMAL_MAXIMUM_UUID; i++) {
	if (priv->uuid_bitmap & (1 << i))
	if (PAGE_SIZE - length > 0)
	length += snprintf(&buf[length],
	PAGE_SIZE - length,
	"%s\n",
	int3400_thermal_uuids[i]);
	}

	return length;
	}

	static ssize_t current_uuid_show(struct device *dev,
	struct device_attribute devattr, char buf)
	{
	struct platform_device *pdev = to_platform_device(dev);
	struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);

	if (priv->uuid_bitmap & (1 << priv->current_uuid_index))
	return sprintf(buf, "%s\n",
	int3400_thermal_uuids[priv->current_uuid_index]);
	else
	return sprintf(buf, "INVALID\n");
	}

	static ssize_t current_uuid_store(struct device *dev,
	struct device_attribute *attr,
	const char *buf, size_t count)
	{
	struct platform_device *pdev = to_platform_device(dev);
	struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
	int i;

	for (i = 0; i < INT3400_THERMAL_MAXIMUM_UUID; ++i) {
	if ((priv->uuid_bitmap & (1 << i)) &&
	!(strncmp(buf, int3400_thermal_uuids[i],
	sizeof(int3400_thermal_uuids[i]) - 1))) {
	priv->current_uuid_index = i;
	return count;
	}
	}

	return -EINVAL;
	}

	static DEVICE_ATTR_RW(current_uuid);
	static DEVICE_ATTR_RO(available_uuids);
	static struct attribute *uuid_attrs[] = {
	&dev_attr_available_uuids.attr,
	&dev_attr_current_uuid.attr,
	NULL
	};

	static const struct attribute_group uuid_attribute_group = {
	.attrs = uuid_attrs,
	.name = "uuids"
	};

	static int int3400_thermal_get_uuids(struct int3400_thermal_priv *priv)
	{
	struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL};
	union acpi_object obja, objb;
	int i, j;
	int result = 0;
	acpi_status status;

	status = acpi_evaluate_object(priv->adev->handle, "IDSP", NULL, &buf);
	if (ACPI_FAILURE(status))
	return -ENODEV;

	obja = (union acpi_object *)buf.pointer;
	if (obja->type != ACPI_TYPE_PACKAGE) {
	result = -EINVAL;
	goto end;
	}

	for (i = 0; i < obja->package.count; i++) {
	objb = &obja->package.elements[i];
	if (objb->type != ACPI_TYPE_BUFFER) {
	result = -EINVAL;
	goto end;
	}

	/* UUID must be 16 bytes */
	if (objb->buffer.length != 16) {
	result = -EINVAL;
	goto end;
	}

	for (j = 0; j < INT3400_THERMAL_MAXIMUM_UUID; j++) {
	guid_t guid;

	guid_parse(int3400_thermal_uuids[j], &guid);
	if (guid_equal((guid_t *)objb->buffer.pointer, &guid)) {
	priv->uuid_bitmap \|= (1 << j);
	break;
	}
	}
	}

	end:
	kfree(buf.pointer);
	return result;
	}

	static int int3400_thermal_run_osc(acpi_handle handle,
	enum int3400_thermal_uuid uuid, bool enable)
	{
	u32 ret, buf[2];
	acpi_status status;
	int result = 0;
	struct acpi_osc_context context = {
	.uuid_str = int3400_thermal_uuids[uuid],
	.rev = 1,
	.cap.length = 8,
	};

	buf[OSC_QUERY_DWORD] = 0;
	buf[OSC_SUPPORT_DWORD] = enable;

	context.cap.pointer = buf;

	status = acpi_run_osc(handle, &context);
	if (ACPI_SUCCESS(status)) {
	ret = ((u32 )(context.ret.pointer + 4));
	if (ret != enable)
	result = -EPERM;
	} else
	result = -EPERM;

	kfree(context.ret.pointer);
	return result;
	}

	static void int3400_notify(acpi_handle handle,
	u32 event,
	void *data)
	{
	struct int3400_thermal_priv *priv = data;
	char *thermal_prop[5];

	if (!priv)
	return;

	switch (event) {
	case INT3400_THERMAL_TABLE_CHANGED:
	thermal_prop[0] = kasprintf(GFP_KERNEL, "NAME=%s",
	priv->thermal->type);
	thermal_prop[1] = kasprintf(GFP_KERNEL, "TEMP=%d",
	priv->thermal->temperature);
	thermal_prop[2] = kasprintf(GFP_KERNEL, "TRIP=");
	thermal_prop[3] = kasprintf(GFP_KERNEL, "EVENT=%d",
	THERMAL_TABLE_CHANGED);
	thermal_prop[4] = NULL;
	kobject_uevent_env(&priv->thermal->device.kobj, KOBJ_CHANGE,
	thermal_prop);
	break;
	default:
	dev_err(&priv->adev->dev, "Unsupported event [0x%x]\n", event);
	break;
	}
	}

	static int int3400_thermal_get_temp(struct thermal_zone_device *thermal,
	int *temp)
	{
	temp = 20 1000; /* faked temp sensor with 20C */
	return 0;
	}

	static int int3400_thermal_get_mode(struct thermal_zone_device *thermal,
	enum thermal_device_mode *mode)
	{
	struct int3400_thermal_priv *priv = thermal->devdata;

	if (!priv)
	return -EINVAL;

	*mode = priv->mode;

	return 0;
	}

	static int int3400_thermal_set_mode(struct thermal_zone_device *thermal,
	enum thermal_device_mode mode)
	{
	struct int3400_thermal_priv *priv = thermal->devdata;
	bool enable;
	int result = 0;

	if (!priv)
	return -EINVAL;

	if (mode == THERMAL_DEVICE_ENABLED)
	enable = true;
	else if (mode == THERMAL_DEVICE_DISABLED)
	enable = false;
	else
	return -EINVAL;

	if (enable != priv->mode) {
	priv->mode = enable;
	result = int3400_thermal_run_osc(priv->adev->handle,
	priv->current_uuid_index,
	enable);
	}
	return result;
	}

	static struct thermal_zone_device_ops int3400_thermal_ops = {
	.get_temp = int3400_thermal_get_temp,
	};

	static struct thermal_zone_params int3400_thermal_params = {
	.governor_name = "user_space",
	.no_hwmon = true,
	};

	static int int3400_thermal_probe(struct platform_device *pdev)
	{
	struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
	struct int3400_thermal_priv *priv;
	int result;

	if (!adev)
	return -ENODEV;

	priv = kzalloc(sizeof(struct int3400_thermal_priv), GFP_KERNEL);
	if (!priv)
	return -ENOMEM;

	priv->adev = adev;

	result = int3400_thermal_get_uuids(priv);
	if (result)
	goto free_priv;

	result = acpi_parse_art(priv->adev->handle, &priv->art_count,
	&priv->arts, true);
	if (result)
	dev_dbg(&pdev->dev, "_ART table parsing error\n");

	result = acpi_parse_trt(priv->adev->handle, &priv->trt_count,
	&priv->trts, true);
	if (result)
	dev_dbg(&pdev->dev, "_TRT table parsing error\n");

	platform_set_drvdata(pdev, priv);

	if (priv->uuid_bitmap & 1 << INT3400_THERMAL_PASSIVE_1) {
	int3400_thermal_ops.get_mode = int3400_thermal_get_mode;
	int3400_thermal_ops.set_mode = int3400_thermal_set_mode;
	}
	priv->thermal = thermal_zone_device_register("INT3400 Thermal", 0, 0,
	priv, &int3400_thermal_ops,
	&int3400_thermal_params, 0, 0);
	if (IS_ERR(priv->thermal)) {
	result = PTR_ERR(priv->thermal);
	goto free_art_trt;
	}

	priv->rel_misc_dev_res = acpi_thermal_rel_misc_device_add(
	priv->adev->handle);

	result = sysfs_create_group(&pdev->dev.kobj, &uuid_attribute_group);
	if (result)
	goto free_zone;

	result = acpi_install_notify_handler(
	priv->adev->handle, ACPI_DEVICE_NOTIFY, int3400_notify,
	(void *)priv);
	if (result)
	goto free_zone;

	return 0;

	free_zone:
	thermal_zone_device_unregister(priv->thermal);
	free_art_trt:
	kfree(priv->trts);
	kfree(priv->arts);
	free_priv:
	kfree(priv);
	return result;
	}

	static int int3400_thermal_remove(struct platform_device *pdev)
	{
	struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);

	acpi_remove_notify_handler(
	priv->adev->handle, ACPI_DEVICE_NOTIFY,
	int3400_notify);

	if (!priv->rel_misc_dev_res)
	acpi_thermal_rel_misc_device_remove(priv->adev->handle);

	sysfs_remove_group(&pdev->dev.kobj, &uuid_attribute_group);
	thermal_zone_device_unregister(priv->thermal);
	kfree(priv->trts);
	kfree(priv->arts);
	kfree(priv);
	return 0;
	}

	static const struct acpi_device_id int3400_thermal_match[] = {
	{"INT3400", 0},
	{}
	};

	MODULE_DEVICE_TABLE(acpi, int3400_thermal_match);

	static struct platform_driver int3400_thermal_driver = {
	.probe = int3400_thermal_probe,
	.remove = int3400_thermal_remove,
	.driver = {
	.name = "int3400 thermal",
	.acpi_match_table = ACPI_PTR(int3400_thermal_match),
	},
	};

	module_platform_driver(int3400_thermal_driver);

	MODULE_DESCRIPTION("INT3400 Thermal driver");
	MODULE_AUTHOR("Zhang Rui <rui.zhang@intel.com>");
	MODULE_LICENSE("GPL");