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 #define INT3400_THERMAL_TABLE_CHANGED 0x83
21 enum int3400_thermal_uuid {
22 INT3400_THERMAL_PASSIVE_1,
23 INT3400_THERMAL_ACTIVE,
24 INT3400_THERMAL_CRITICAL,
25 INT3400_THERMAL_ADAPTIVE_PERFORMANCE,
26 INT3400_THERMAL_EMERGENCY_CALL_MODE,
27 INT3400_THERMAL_PASSIVE_2,
28 INT3400_THERMAL_POWER_BOSS,
29 INT3400_THERMAL_VIRTUAL_SENSOR,
30 INT3400_THERMAL_COOLING_MODE,
31 INT3400_THERMAL_HARDWARE_DUTY_CYCLING,
32 INT3400_THERMAL_MAXIMUM_UUID,
35 static char *int3400_thermal_uuids[INT3400_THERMAL_MAXIMUM_UUID] = {
36 "42A441D6-AE6A-462b-A84B-4A8CE79027D3",
37 "3A95C389-E4B8-4629-A526-C52C88626BAE",
38 "97C68AE7-15FA-499c-B8C9-5DA81D606E0A",
39 "63BE270F-1C11-48FD-A6F7-3AF253FF3E2D",
40 "5349962F-71E6-431D-9AE8-0A635B710AEE",
41 "9E04115A-AE87-4D1C-9500-0F3E340BFE75",
42 "F5A35014-C209-46A4-993A-EB56DE7530A1",
43 "6ED722A7-9240-48A5-B479-31EEF723D7CF",
44 "16CAF1B7-DD38-40ED-B1C1-1B8A1913D531",
45 "BE84BABF-C4D4-403D-B495-3128FD44dAC1",
48 struct int3400_thermal_priv {
49 struct acpi_device *adev;
50 struct thermal_zone_device *thermal;
58 int current_uuid_index;
61 static ssize_t available_uuids_show(struct device *dev,
62 struct device_attribute *attr,
65 struct platform_device *pdev = to_platform_device(dev);
66 struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
70 for (i = 0; i < INT3400_THERMAL_MAXIMUM_UUID; i++) {
71 if (priv->uuid_bitmap & (1 << i))
72 if (PAGE_SIZE - length > 0)
73 length += snprintf(&buf[length],
76 int3400_thermal_uuids[i]);
82 static ssize_t current_uuid_show(struct device *dev,
83 struct device_attribute *devattr, char *buf)
85 struct platform_device *pdev = to_platform_device(dev);
86 struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
88 if (priv->uuid_bitmap & (1 << priv->current_uuid_index))
89 return sprintf(buf, "%s\n",
90 int3400_thermal_uuids[priv->current_uuid_index]);
92 return sprintf(buf, "INVALID\n");
95 static ssize_t current_uuid_store(struct device *dev,
96 struct device_attribute *attr,
97 const char *buf, size_t count)
99 struct platform_device *pdev = to_platform_device(dev);
100 struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
103 for (i = 0; i < INT3400_THERMAL_MAXIMUM_UUID; ++i) {
104 if ((priv->uuid_bitmap & (1 << i)) &&
105 !(strncmp(buf, int3400_thermal_uuids[i],
106 sizeof(int3400_thermal_uuids[i]) - 1))) {
107 priv->current_uuid_index = i;
115 static DEVICE_ATTR_RW(current_uuid);
116 static DEVICE_ATTR_RO(available_uuids);
117 static struct attribute *uuid_attrs[] = {
118 &dev_attr_available_uuids.attr,
119 &dev_attr_current_uuid.attr,
123 static const struct attribute_group uuid_attribute_group = {
128 static int int3400_thermal_get_uuids(struct int3400_thermal_priv *priv)
130 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL};
131 union acpi_object *obja, *objb;
136 status = acpi_evaluate_object(priv->adev->handle, "IDSP", NULL, &buf);
137 if (ACPI_FAILURE(status))
140 obja = (union acpi_object *)buf.pointer;
141 if (obja->type != ACPI_TYPE_PACKAGE) {
146 for (i = 0; i < obja->package.count; i++) {
147 objb = &obja->package.elements[i];
148 if (objb->type != ACPI_TYPE_BUFFER) {
153 /* UUID must be 16 bytes */
154 if (objb->buffer.length != 16) {
159 for (j = 0; j < INT3400_THERMAL_MAXIMUM_UUID; j++) {
162 guid_parse(int3400_thermal_uuids[j], &guid);
163 if (guid_equal((guid_t *)objb->buffer.pointer, &guid)) {
164 priv->uuid_bitmap |= (1 << j);
175 static int int3400_thermal_run_osc(acpi_handle handle,
176 enum int3400_thermal_uuid uuid, bool enable)
181 struct acpi_osc_context context = {
182 .uuid_str = int3400_thermal_uuids[uuid],
187 buf[OSC_QUERY_DWORD] = 0;
188 buf[OSC_SUPPORT_DWORD] = enable;
190 context.cap.pointer = buf;
192 status = acpi_run_osc(handle, &context);
193 if (ACPI_SUCCESS(status)) {
194 ret = *((u32 *)(context.ret.pointer + 4));
200 kfree(context.ret.pointer);
204 static void int3400_notify(acpi_handle handle,
208 struct int3400_thermal_priv *priv = data;
209 char *thermal_prop[5];
215 case INT3400_THERMAL_TABLE_CHANGED:
216 thermal_prop[0] = kasprintf(GFP_KERNEL, "NAME=%s",
217 priv->thermal->type);
218 thermal_prop[1] = kasprintf(GFP_KERNEL, "TEMP=%d",
219 priv->thermal->temperature);
220 thermal_prop[2] = kasprintf(GFP_KERNEL, "TRIP=");
221 thermal_prop[3] = kasprintf(GFP_KERNEL, "EVENT=%d",
222 THERMAL_TABLE_CHANGED);
223 thermal_prop[4] = NULL;
224 kobject_uevent_env(&priv->thermal->device.kobj, KOBJ_CHANGE,
228 /* Ignore unknown notification codes sent to INT3400 device */
233 static int int3400_thermal_get_temp(struct thermal_zone_device *thermal,
236 *temp = 20 * 1000; /* faked temp sensor with 20C */
240 static int int3400_thermal_get_mode(struct thermal_zone_device *thermal,
241 enum thermal_device_mode *mode)
243 struct int3400_thermal_priv *priv = thermal->devdata;
253 static int int3400_thermal_set_mode(struct thermal_zone_device *thermal,
254 enum thermal_device_mode mode)
256 struct int3400_thermal_priv *priv = thermal->devdata;
263 if (mode == THERMAL_DEVICE_ENABLED)
265 else if (mode == THERMAL_DEVICE_DISABLED)
270 if (enable != priv->mode) {
272 result = int3400_thermal_run_osc(priv->adev->handle,
273 priv->current_uuid_index,
279 static struct thermal_zone_device_ops int3400_thermal_ops = {
280 .get_temp = int3400_thermal_get_temp,
283 static struct thermal_zone_params int3400_thermal_params = {
284 .governor_name = "user_space",
288 static int int3400_thermal_probe(struct platform_device *pdev)
290 struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
291 struct int3400_thermal_priv *priv;
297 priv = kzalloc(sizeof(struct int3400_thermal_priv), GFP_KERNEL);
303 result = int3400_thermal_get_uuids(priv);
307 result = acpi_parse_art(priv->adev->handle, &priv->art_count,
310 dev_dbg(&pdev->dev, "_ART table parsing error\n");
312 result = acpi_parse_trt(priv->adev->handle, &priv->trt_count,
315 dev_dbg(&pdev->dev, "_TRT table parsing error\n");
317 platform_set_drvdata(pdev, priv);
319 int3400_thermal_ops.get_mode = int3400_thermal_get_mode;
320 int3400_thermal_ops.set_mode = int3400_thermal_set_mode;
322 priv->thermal = thermal_zone_device_register("INT3400 Thermal", 0, 0,
323 priv, &int3400_thermal_ops,
324 &int3400_thermal_params, 0, 0);
325 if (IS_ERR(priv->thermal)) {
326 result = PTR_ERR(priv->thermal);
330 priv->rel_misc_dev_res = acpi_thermal_rel_misc_device_add(
333 result = sysfs_create_group(&pdev->dev.kobj, &uuid_attribute_group);
337 result = acpi_install_notify_handler(
338 priv->adev->handle, ACPI_DEVICE_NOTIFY, int3400_notify,
346 sysfs_remove_group(&pdev->dev.kobj, &uuid_attribute_group);
348 if (!priv->rel_misc_dev_res)
349 acpi_thermal_rel_misc_device_remove(priv->adev->handle);
350 thermal_zone_device_unregister(priv->thermal);
359 static int int3400_thermal_remove(struct platform_device *pdev)
361 struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
363 acpi_remove_notify_handler(
364 priv->adev->handle, ACPI_DEVICE_NOTIFY,
367 if (!priv->rel_misc_dev_res)
368 acpi_thermal_rel_misc_device_remove(priv->adev->handle);
370 sysfs_remove_group(&pdev->dev.kobj, &uuid_attribute_group);
371 thermal_zone_device_unregister(priv->thermal);
378 static const struct acpi_device_id int3400_thermal_match[] = {
383 MODULE_DEVICE_TABLE(acpi, int3400_thermal_match);
385 static struct platform_driver int3400_thermal_driver = {
386 .probe = int3400_thermal_probe,
387 .remove = int3400_thermal_remove,
389 .name = "int3400 thermal",
390 .acpi_match_table = ACPI_PTR(int3400_thermal_match),
394 module_platform_driver(int3400_thermal_driver);
396 MODULE_DESCRIPTION("INT3400 Thermal driver");
397 MODULE_AUTHOR("Zhang Rui <rui.zhang@intel.com>");
398 MODULE_LICENSE("GPL");