2 * INT3400 thermal driver
4 * Copyright (C) 2014, Intel Corporation
5 * Authors: Zhang Rui <rui.zhang@intel.com>
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.
13 #include <linux/module.h>
14 #include <linux/platform_device.h>
15 #include <linux/acpi.h>
16 #include <linux/thermal.h>
17 #include "acpi_thermal_rel.h"
19 enum int3400_thermal_uuid {
20 INT3400_THERMAL_PASSIVE_1,
21 INT3400_THERMAL_ACTIVE,
22 INT3400_THERMAL_CRITICAL,
23 INT3400_THERMAL_ADAPTIVE_PERFORMANCE,
24 INT3400_THERMAL_EMERGENCY_CALL_MODE,
25 INT3400_THERMAL_PASSIVE_2,
26 INT3400_THERMAL_POWER_BOSS,
27 INT3400_THERMAL_VIRTUAL_SENSOR,
28 INT3400_THERMAL_COOLING_MODE,
29 INT3400_THERMAL_HARDWARE_DUTY_CYCLING,
30 INT3400_THERMAL_MAXIMUM_UUID,
33 static u8 *int3400_thermal_uuids[INT3400_THERMAL_MAXIMUM_UUID] = {
34 "42A441D6-AE6A-462b-A84B-4A8CE79027D3",
35 "3A95C389-E4B8-4629-A526-C52C88626BAE",
36 "97C68AE7-15FA-499c-B8C9-5DA81D606E0A",
37 "63BE270F-1C11-48FD-A6F7-3AF253FF3E2D",
38 "5349962F-71E6-431D-9AE8-0A635B710AEE",
39 "9E04115A-AE87-4D1C-9500-0F3E340BFE75",
40 "F5A35014-C209-46A4-993A-EB56DE7530A1",
41 "6ED722A7-9240-48A5-B479-31EEF723D7CF",
42 "16CAF1B7-DD38-40ED-B1C1-1B8A1913D531",
43 "BE84BABF-C4D4-403D-B495-3128FD44dAC1",
46 struct int3400_thermal_priv {
47 struct acpi_device *adev;
48 struct thermal_zone_device *thermal;
56 int current_uuid_index;
59 static ssize_t available_uuids_show(struct device *dev,
60 struct device_attribute *attr,
63 struct platform_device *pdev = to_platform_device(dev);
64 struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
68 for (i = 0; i < INT3400_THERMAL_MAXIMUM_UUID; i++) {
69 if (priv->uuid_bitmap & (1 << i))
70 if (PAGE_SIZE - length > 0)
71 length += snprintf(&buf[length],
74 int3400_thermal_uuids[i]);
80 static ssize_t current_uuid_show(struct device *dev,
81 struct device_attribute *devattr, char *buf)
83 struct platform_device *pdev = to_platform_device(dev);
84 struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
86 if (priv->uuid_bitmap & (1 << priv->current_uuid_index))
87 return sprintf(buf, "%s\n",
88 int3400_thermal_uuids[priv->current_uuid_index]);
90 return sprintf(buf, "INVALID\n");
93 static ssize_t current_uuid_store(struct device *dev,
94 struct device_attribute *attr,
95 const char *buf, size_t count)
97 struct platform_device *pdev = to_platform_device(dev);
98 struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
101 for (i = 0; i < INT3400_THERMAL_MAXIMUM_UUID; ++i) {
102 if ((priv->uuid_bitmap & (1 << i)) &&
103 !(strncmp(buf, int3400_thermal_uuids[i],
104 sizeof(int3400_thermal_uuids[i]) - 1))) {
105 priv->current_uuid_index = i;
113 static DEVICE_ATTR(current_uuid, 0644, current_uuid_show, current_uuid_store);
114 static DEVICE_ATTR_RO(available_uuids);
115 static struct attribute *uuid_attrs[] = {
116 &dev_attr_available_uuids.attr,
117 &dev_attr_current_uuid.attr,
121 static struct attribute_group uuid_attribute_group = {
126 static int int3400_thermal_get_uuids(struct int3400_thermal_priv *priv)
128 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL};
129 union acpi_object *obja, *objb;
134 status = acpi_evaluate_object(priv->adev->handle, "IDSP", NULL, &buf);
135 if (ACPI_FAILURE(status))
138 obja = (union acpi_object *)buf.pointer;
139 if (obja->type != ACPI_TYPE_PACKAGE) {
144 for (i = 0; i < obja->package.count; i++) {
145 objb = &obja->package.elements[i];
146 if (objb->type != ACPI_TYPE_BUFFER) {
151 /* UUID must be 16 bytes */
152 if (objb->buffer.length != 16) {
157 for (j = 0; j < INT3400_THERMAL_MAXIMUM_UUID; j++) {
160 acpi_str_to_uuid(int3400_thermal_uuids[j], uuid);
161 if (!strncmp(uuid, objb->buffer.pointer, 16)) {
162 priv->uuid_bitmap |= (1 << j);
173 static int int3400_thermal_run_osc(acpi_handle handle,
174 enum int3400_thermal_uuid uuid, bool enable)
179 struct acpi_osc_context context = {
180 .uuid_str = int3400_thermal_uuids[uuid],
185 buf[OSC_QUERY_DWORD] = 0;
186 buf[OSC_SUPPORT_DWORD] = enable;
188 context.cap.pointer = buf;
190 status = acpi_run_osc(handle, &context);
191 if (ACPI_SUCCESS(status)) {
192 ret = *((u32 *)(context.ret.pointer + 4));
198 kfree(context.ret.pointer);
202 static int int3400_thermal_get_temp(struct thermal_zone_device *thermal,
205 *temp = 20 * 1000; /* faked temp sensor with 20C */
209 static int int3400_thermal_get_mode(struct thermal_zone_device *thermal,
210 enum thermal_device_mode *mode)
212 struct int3400_thermal_priv *priv = thermal->devdata;
222 static int int3400_thermal_set_mode(struct thermal_zone_device *thermal,
223 enum thermal_device_mode mode)
225 struct int3400_thermal_priv *priv = thermal->devdata;
232 if (mode == THERMAL_DEVICE_ENABLED)
234 else if (mode == THERMAL_DEVICE_DISABLED)
239 if (enable != priv->mode) {
241 result = int3400_thermal_run_osc(priv->adev->handle,
242 priv->current_uuid_index,
248 static struct thermal_zone_device_ops int3400_thermal_ops = {
249 .get_temp = int3400_thermal_get_temp,
252 static struct thermal_zone_params int3400_thermal_params = {
253 .governor_name = "user_space",
257 static int int3400_thermal_probe(struct platform_device *pdev)
259 struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
260 struct int3400_thermal_priv *priv;
266 priv = kzalloc(sizeof(struct int3400_thermal_priv), GFP_KERNEL);
272 result = int3400_thermal_get_uuids(priv);
276 result = acpi_parse_art(priv->adev->handle, &priv->art_count,
279 dev_dbg(&pdev->dev, "_ART table parsing error\n");
281 result = acpi_parse_trt(priv->adev->handle, &priv->trt_count,
284 dev_dbg(&pdev->dev, "_TRT table parsing error\n");
286 platform_set_drvdata(pdev, priv);
288 int3400_thermal_ops.get_mode = int3400_thermal_get_mode;
289 int3400_thermal_ops.set_mode = int3400_thermal_set_mode;
291 priv->thermal = thermal_zone_device_register("INT3400 Thermal", 0, 0,
292 priv, &int3400_thermal_ops,
293 &int3400_thermal_params, 0, 0);
294 if (IS_ERR(priv->thermal)) {
295 result = PTR_ERR(priv->thermal);
299 priv->rel_misc_dev_res = acpi_thermal_rel_misc_device_add(
302 result = sysfs_create_group(&pdev->dev.kobj, &uuid_attribute_group);
309 thermal_zone_device_unregister(priv->thermal);
318 static int int3400_thermal_remove(struct platform_device *pdev)
320 struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
322 if (!priv->rel_misc_dev_res)
323 acpi_thermal_rel_misc_device_remove(priv->adev->handle);
325 sysfs_remove_group(&pdev->dev.kobj, &uuid_attribute_group);
326 thermal_zone_device_unregister(priv->thermal);
333 static const struct acpi_device_id int3400_thermal_match[] = {
338 MODULE_DEVICE_TABLE(acpi, int3400_thermal_match);
340 static struct platform_driver int3400_thermal_driver = {
341 .probe = int3400_thermal_probe,
342 .remove = int3400_thermal_remove,
344 .name = "int3400 thermal",
345 .acpi_match_table = ACPI_PTR(int3400_thermal_match),
349 module_platform_driver(int3400_thermal_driver);
351 MODULE_DESCRIPTION("INT3400 Thermal driver");
352 MODULE_AUTHOR("Zhang Rui <rui.zhang@intel.com>");
353 MODULE_LICENSE("GPL");