[deliverable/linux.git] / drivers / thermal / int340x_thermal / int3400_thermal.c

/*
 * 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"

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

static u8 *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(current_uuid, 0644, current_uuid_show, current_uuid_store);
static DEVICE_ATTR_RO(available_uuids);
static struct attribute *uuid_attrs[] = {
	&dev_attr_available_uuids.attr,
	&dev_attr_current_uuid.attr,
	NULL
};

static 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++) {
			u8 uuid[16];

			acpi_str_to_uuid(int3400_thermal_uuids[j], uuid);
			if (!strncmp(uuid, objb->buffer.pointer, 16)) {
				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 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;

	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);

	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");
Commit	Line	Data
816cab93 ZR	1	/*
	2	* INT3400 thermal driver
	3	*
	4	* Copyright (C) 2014, Intel Corporation
	5	* Authors: Zhang Rui <rui.zhang@intel.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*
	11	*/
	12
	13	#include <linux/module.h>
	14	#include <linux/platform_device.h>
	15	#include <linux/acpi.h>
0ab15365	16	#include <linux/thermal.h>
6306e68a	17	#include "acpi_thermal_rel.h"
816cab93	18
c5738ddd ZR	19	enum int3400_thermal_uuid {
c5738ddd ZR	20	INT3400_THERMAL_PASSIVE_1,
c5738ddd ZR	21	INT3400_THERMAL_ACTIVE,
c5738ddd ZR	22	INT3400_THERMAL_CRITICAL,
c5738ddd ZR	23	INT3400_THERMAL_MAXIMUM_UUID,
	24	};
	25
	26	static u8 *int3400_thermal_uuids[INT3400_THERMAL_MAXIMUM_UUID] = {
	27	"42A441D6-AE6A-462b-A84B-4A8CE79027D3",
c5738ddd ZR	28	"3A95C389-E4B8-4629-A526-C52C88626BAE",
c5738ddd ZR	29	"97C68AE7-15FA-499c-B8C9-5DA81D606E0A",
c5738ddd ZR	30	};
c5738ddd ZR	31
816cab93 ZR	32	struct int3400_thermal_priv {
816cab93 ZR	33	struct acpi_device *adev;
0ab15365 ZR	34	struct thermal_zone_device *thermal;
0ab15365 ZR	35	int mode;
816cab93 ZR	36	int art_count;
	37	struct art *arts;
	38	int trt_count;
	39	struct trt *trts;
c5738ddd	40	u8 uuid_bitmap;
6306e68a	41	int rel_misc_dev_res;
19ecaea2 SP	42	int current_uuid_index;
	43	};
	44
	45	static ssize_t available_uuids_show(struct device *dev,
	46	struct device_attribute *attr,
	47	char *buf)
	48	{
	49	struct platform_device *pdev = to_platform_device(dev);
	50	struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
	51	int i;
	52	int length = 0;
	53
	54	for (i = 0; i < INT3400_THERMAL_MAXIMUM_UUID; i++) {
	55	if (priv->uuid_bitmap & (1 << i))
	56	if (PAGE_SIZE - length > 0)
	57	length += snprintf(&buf[length],
	58	PAGE_SIZE - length,
	59	"%s\n",
	60	int3400_thermal_uuids[i]);
	61	}
	62
	63	return length;
	64	}
	65
	66	static ssize_t current_uuid_show(struct device *dev,
	67	struct device_attribute devattr, char buf)
	68	{
	69	struct platform_device *pdev = to_platform_device(dev);
	70	struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
	71
	72	if (priv->uuid_bitmap & (1 << priv->current_uuid_index))
	73	return sprintf(buf, "%s\n",
	74	int3400_thermal_uuids[priv->current_uuid_index]);
	75	else
	76	return sprintf(buf, "INVALID\n");
	77	}
	78
	79	static ssize_t current_uuid_store(struct device *dev,
	80	struct device_attribute *attr,
	81	const char *buf, size_t count)
	82	{
	83	struct platform_device *pdev = to_platform_device(dev);
	84	struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
	85	int i;
	86
	87	for (i = 0; i < INT3400_THERMAL_MAXIMUM_UUID; ++i) {
	88	if ((priv->uuid_bitmap & (1 << i)) &&
	89	!(strncmp(buf, int3400_thermal_uuids[i],
	90	sizeof(int3400_thermal_uuids[i]) - 1))) {
	91	priv->current_uuid_index = i;
	92	return count;
	93	}
	94	}
	95
	96	return -EINVAL;
	97	}
	98
	99	static DEVICE_ATTR(current_uuid, 0644, current_uuid_show, current_uuid_store);
	100	static DEVICE_ATTR_RO(available_uuids);
	101	static struct attribute *uuid_attrs[] = {
	102	&dev_attr_available_uuids.attr,
	103	&dev_attr_current_uuid.attr,
	104	NULL
	105	};
106
107	static struct attribute_group uuid_attribute_group = {
108	.attrs = uuid_attrs,
109	.name = "uuids"
816cab93 ZR	110	};
816cab93 ZR	111
c5738ddd ZR	112	static int int3400_thermal_get_uuids(struct int3400_thermal_priv *priv)
	113	{
	114	struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL};
	115	union acpi_object obja, objb;
	116	int i, j;
	117	int result = 0;
	118	acpi_status status;
	119
	120	status = acpi_evaluate_object(priv->adev->handle, "IDSP", NULL, &buf);
	121	if (ACPI_FAILURE(status))
	122	return -ENODEV;
	123
	124	obja = (union acpi_object *)buf.pointer;
	125	if (obja->type != ACPI_TYPE_PACKAGE) {
	126	result = -EINVAL;
	127	goto end;
	128	}
	129
	130	for (i = 0; i < obja->package.count; i++) {
	131	objb = &obja->package.elements[i];
	132	if (objb->type != ACPI_TYPE_BUFFER) {
	133	result = -EINVAL;
	134	goto end;
	135	}
	136
	137	/* UUID must be 16 bytes */
	138	if (objb->buffer.length != 16) {
	139	result = -EINVAL;
	140	goto end;
	141	}
	142
	143	for (j = 0; j < INT3400_THERMAL_MAXIMUM_UUID; j++) {
	144	u8 uuid[16];
	145
	146	acpi_str_to_uuid(int3400_thermal_uuids[j], uuid);
	147	if (!strncmp(uuid, objb->buffer.pointer, 16)) {
	148	priv->uuid_bitmap \|= (1 << j);
	149	break;
	150	}
	151	}
	152	}
	153
	154	end:
	155	kfree(buf.pointer);
	156	return result;
	157	}
	158
0ab15365 ZR	159	static int int3400_thermal_run_osc(acpi_handle handle,
	160	enum int3400_thermal_uuid uuid, bool enable)
	161	{
	162	u32 ret, buf[2];
	163	acpi_status status;
	164	int result = 0;
	165	struct acpi_osc_context context = {
	166	.uuid_str = int3400_thermal_uuids[uuid],
	167	.rev = 1,
	168	.cap.length = 8,
	169	};
	170
	171	buf[OSC_QUERY_DWORD] = 0;
	172	buf[OSC_SUPPORT_DWORD] = enable;
	173
	174	context.cap.pointer = buf;
	175
	176	status = acpi_run_osc(handle, &context);
	177	if (ACPI_SUCCESS(status)) {
	178	ret = ((u32 )(context.ret.pointer + 4));
	179	if (ret != enable)
	180	result = -EPERM;
	181	} else
	182	result = -EPERM;
	183
	184	kfree(context.ret.pointer);
	185	return result;
	186	}
	187
0ab15365	188	static int int3400_thermal_get_temp(struct thermal_zone_device *thermal,
17e8351a	189	int *temp)
0ab15365 ZR	190	{
	191	temp = 20 1000; /* faked temp sensor with 20C */
	192	return 0;
	193	}
	194
	195	static int int3400_thermal_get_mode(struct thermal_zone_device *thermal,
	196	enum thermal_device_mode *mode)
	197	{
	198	struct int3400_thermal_priv *priv = thermal->devdata;
	199
	200	if (!priv)
	201	return -EINVAL;
	202
	203	*mode = priv->mode;
	204
	205	return 0;
	206	}
	207
	208	static int int3400_thermal_set_mode(struct thermal_zone_device *thermal,
	209	enum thermal_device_mode mode)
	210	{
	211	struct int3400_thermal_priv *priv = thermal->devdata;
	212	bool enable;
	213	int result = 0;
	214
	215	if (!priv)
	216	return -EINVAL;
	217
	218	if (mode == THERMAL_DEVICE_ENABLED)
	219	enable = true;
	220	else if (mode == THERMAL_DEVICE_DISABLED)
	221	enable = false;
	222	else
	223	return -EINVAL;
	224
	225	if (enable != priv->mode) {
	226	priv->mode = enable;
0ab15365	227	result = int3400_thermal_run_osc(priv->adev->handle,
19ecaea2 SP	228	priv->current_uuid_index,
19ecaea2 SP	229	enable);
0ab15365 ZR	230	}
	231	return result;
	232	}
	233
	234	static struct thermal_zone_device_ops int3400_thermal_ops = {
	235	.get_temp = int3400_thermal_get_temp,
	236	};
	237
	238	static struct thermal_zone_params int3400_thermal_params = {
	239	.governor_name = "user_space",
	240	.no_hwmon = true,
	241	};
	242
816cab93 ZR	243	static int int3400_thermal_probe(struct platform_device *pdev)
	244	{
	245	struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
	246	struct int3400_thermal_priv *priv;
	247	int result;
	248
	249	if (!adev)
	250	return -ENODEV;
	251
	252	priv = kzalloc(sizeof(struct int3400_thermal_priv), GFP_KERNEL);
	253	if (!priv)
	254	return -ENOMEM;
	255
	256	priv->adev = adev;
	257
c5738ddd ZR	258	result = int3400_thermal_get_uuids(priv);
	259	if (result)
	260	goto free_priv;
	261
6306e68a JP	262	result = acpi_parse_art(priv->adev->handle, &priv->art_count,
6306e68a JP	263	&priv->arts, true);
816cab93	264	if (result)
f1260791	265	dev_dbg(&pdev->dev, "_ART table parsing error\n");
6306e68a JP	266
	267	result = acpi_parse_trt(priv->adev->handle, &priv->trt_count,
	268	&priv->trts, true);
816cab93	269	if (result)
f1260791	270	dev_dbg(&pdev->dev, "_TRT table parsing error\n");
816cab93 ZR	271
	272	platform_set_drvdata(pdev, priv);
	273
0ab15365 ZR	274	if (priv->uuid_bitmap & 1 << INT3400_THERMAL_PASSIVE_1) {
	275	int3400_thermal_ops.get_mode = int3400_thermal_get_mode;
	276	int3400_thermal_ops.set_mode = int3400_thermal_set_mode;
	277	}
	278	priv->thermal = thermal_zone_device_register("INT3400 Thermal", 0, 0,
	279	priv, &int3400_thermal_ops,
	280	&int3400_thermal_params, 0, 0);
	281	if (IS_ERR(priv->thermal)) {
	282	result = PTR_ERR(priv->thermal);
f1260791	283	goto free_art_trt;
0ab15365 ZR	284	}
0ab15365 ZR	285
6306e68a JP	286	priv->rel_misc_dev_res = acpi_thermal_rel_misc_device_add(
	287	priv->adev->handle);
	288
19ecaea2 SP	289	result = sysfs_create_group(&pdev->dev.kobj, &uuid_attribute_group);
	290	if (result)
	291	goto free_zone;
	292
816cab93	293	return 0;
19ecaea2 SP	294
	295	free_zone:
	296	thermal_zone_device_unregister(priv->thermal);
f1260791	297	free_art_trt:
0ab15365	298	kfree(priv->trts);
816cab93 ZR	299	kfree(priv->arts);
	300	free_priv:
	301	kfree(priv);
	302	return result;
	303	}
	304
	305	static int int3400_thermal_remove(struct platform_device *pdev)
	306	{
	307	struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
	308
6306e68a JP	309	if (!priv->rel_misc_dev_res)
	310	acpi_thermal_rel_misc_device_remove(priv->adev->handle);
	311
19ecaea2	312	sysfs_remove_group(&pdev->dev.kobj, &uuid_attribute_group);
0ab15365	313	thermal_zone_device_unregister(priv->thermal);
816cab93 ZR	314	kfree(priv->trts);
	315	kfree(priv->arts);
	316	kfree(priv);
	317	return 0;
	318	}
	319
	320	static const struct acpi_device_id int3400_thermal_match[] = {
	321	{"INT3400", 0},
	322	{}
	323	};
	324
	325	MODULE_DEVICE_TABLE(acpi, int3400_thermal_match);
	326
	327	static struct platform_driver int3400_thermal_driver = {
	328	.probe = int3400_thermal_probe,
	329	.remove = int3400_thermal_remove,
	330	.driver = {
	331	.name = "int3400 thermal",
816cab93 ZR	332	.acpi_match_table = ACPI_PTR(int3400_thermal_match),
	333	},
	334	};
	335
	336	module_platform_driver(int3400_thermal_driver);
	337
	338	MODULE_DESCRIPTION("INT3400 Thermal driver");
	339	MODULE_AUTHOR("Zhang Rui <rui.zhang@intel.com>");
	340	MODULE_LICENSE("GPL");