mirror of https://gitee.com/openkylin/linux.git
347 lines
8.0 KiB
C
347 lines
8.0 KiB
C
/*
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* INT3400 thermal driver
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*
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* Copyright (C) 2014, Intel Corporation
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* Authors: Zhang Rui <rui.zhang@intel.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/acpi.h>
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#include <linux/thermal.h>
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#include "acpi_thermal_rel.h"
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enum int3400_thermal_uuid {
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INT3400_THERMAL_PASSIVE_1,
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INT3400_THERMAL_PASSIVE_2,
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INT3400_THERMAL_ACTIVE,
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INT3400_THERMAL_CRITICAL,
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INT3400_THERMAL_COOLING_MODE,
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INT3400_THERMAL_MAXIMUM_UUID,
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};
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static u8 *int3400_thermal_uuids[INT3400_THERMAL_MAXIMUM_UUID] = {
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"42A441D6-AE6A-462b-A84B-4A8CE79027D3",
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"9E04115A-AE87-4D1C-9500-0F3E340BFE75",
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"3A95C389-E4B8-4629-A526-C52C88626BAE",
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"97C68AE7-15FA-499c-B8C9-5DA81D606E0A",
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"16CAF1B7-DD38-40ed-B1C1-1B8A1913D531",
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};
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struct int3400_thermal_priv {
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struct acpi_device *adev;
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struct thermal_zone_device *thermal;
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int mode;
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int art_count;
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struct art *arts;
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int trt_count;
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struct trt *trts;
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u8 uuid_bitmap;
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int rel_misc_dev_res;
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int current_uuid_index;
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};
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static ssize_t available_uuids_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
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int i;
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int length = 0;
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for (i = 0; i < INT3400_THERMAL_MAXIMUM_UUID; i++) {
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if (priv->uuid_bitmap & (1 << i))
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if (PAGE_SIZE - length > 0)
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length += snprintf(&buf[length],
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PAGE_SIZE - length,
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"%s\n",
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int3400_thermal_uuids[i]);
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}
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return length;
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}
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static ssize_t current_uuid_show(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
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if (priv->uuid_bitmap & (1 << priv->current_uuid_index))
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return sprintf(buf, "%s\n",
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int3400_thermal_uuids[priv->current_uuid_index]);
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else
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return sprintf(buf, "INVALID\n");
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}
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static ssize_t current_uuid_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
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int i;
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for (i = 0; i < INT3400_THERMAL_MAXIMUM_UUID; ++i) {
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if ((priv->uuid_bitmap & (1 << i)) &&
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!(strncmp(buf, int3400_thermal_uuids[i],
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sizeof(int3400_thermal_uuids[i]) - 1))) {
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priv->current_uuid_index = i;
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return count;
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}
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}
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return -EINVAL;
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}
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static DEVICE_ATTR(current_uuid, 0644, current_uuid_show, current_uuid_store);
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static DEVICE_ATTR_RO(available_uuids);
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static struct attribute *uuid_attrs[] = {
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&dev_attr_available_uuids.attr,
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&dev_attr_current_uuid.attr,
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NULL
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};
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static struct attribute_group uuid_attribute_group = {
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.attrs = uuid_attrs,
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.name = "uuids"
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};
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static int int3400_thermal_get_uuids(struct int3400_thermal_priv *priv)
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{
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struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL};
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union acpi_object *obja, *objb;
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int i, j;
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int result = 0;
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acpi_status status;
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status = acpi_evaluate_object(priv->adev->handle, "IDSP", NULL, &buf);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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obja = (union acpi_object *)buf.pointer;
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if (obja->type != ACPI_TYPE_PACKAGE) {
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result = -EINVAL;
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goto end;
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}
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for (i = 0; i < obja->package.count; i++) {
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objb = &obja->package.elements[i];
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if (objb->type != ACPI_TYPE_BUFFER) {
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result = -EINVAL;
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goto end;
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}
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/* UUID must be 16 bytes */
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if (objb->buffer.length != 16) {
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result = -EINVAL;
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goto end;
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}
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for (j = 0; j < INT3400_THERMAL_MAXIMUM_UUID; j++) {
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u8 uuid[16];
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acpi_str_to_uuid(int3400_thermal_uuids[j], uuid);
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if (!strncmp(uuid, objb->buffer.pointer, 16)) {
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priv->uuid_bitmap |= (1 << j);
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break;
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}
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}
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}
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end:
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kfree(buf.pointer);
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return result;
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}
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static int int3400_thermal_run_osc(acpi_handle handle,
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enum int3400_thermal_uuid uuid, bool enable)
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{
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u32 ret, buf[2];
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acpi_status status;
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int result = 0;
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struct acpi_osc_context context = {
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.uuid_str = int3400_thermal_uuids[uuid],
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.rev = 1,
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.cap.length = 8,
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};
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buf[OSC_QUERY_DWORD] = 0;
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buf[OSC_SUPPORT_DWORD] = enable;
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context.cap.pointer = buf;
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status = acpi_run_osc(handle, &context);
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if (ACPI_SUCCESS(status)) {
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ret = *((u32 *)(context.ret.pointer + 4));
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if (ret != enable)
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result = -EPERM;
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} else
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result = -EPERM;
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kfree(context.ret.pointer);
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return result;
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}
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static int int3400_thermal_get_temp(struct thermal_zone_device *thermal,
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unsigned long *temp)
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{
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*temp = 20 * 1000; /* faked temp sensor with 20C */
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return 0;
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}
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static int int3400_thermal_get_mode(struct thermal_zone_device *thermal,
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enum thermal_device_mode *mode)
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{
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struct int3400_thermal_priv *priv = thermal->devdata;
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if (!priv)
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return -EINVAL;
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*mode = priv->mode;
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return 0;
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}
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static int int3400_thermal_set_mode(struct thermal_zone_device *thermal,
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enum thermal_device_mode mode)
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{
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struct int3400_thermal_priv *priv = thermal->devdata;
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bool enable;
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int result = 0;
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if (!priv)
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return -EINVAL;
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if (mode == THERMAL_DEVICE_ENABLED)
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enable = true;
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else if (mode == THERMAL_DEVICE_DISABLED)
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enable = false;
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else
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return -EINVAL;
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if (enable != priv->mode) {
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priv->mode = enable;
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result = int3400_thermal_run_osc(priv->adev->handle,
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priv->current_uuid_index,
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enable);
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}
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return result;
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}
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static struct thermal_zone_device_ops int3400_thermal_ops = {
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.get_temp = int3400_thermal_get_temp,
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};
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static struct thermal_zone_params int3400_thermal_params = {
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.governor_name = "user_space",
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.no_hwmon = true,
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};
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static int int3400_thermal_probe(struct platform_device *pdev)
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{
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struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
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struct int3400_thermal_priv *priv;
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int result;
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if (!adev)
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return -ENODEV;
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priv = kzalloc(sizeof(struct int3400_thermal_priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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priv->adev = adev;
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result = int3400_thermal_get_uuids(priv);
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if (result)
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goto free_priv;
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result = acpi_parse_art(priv->adev->handle, &priv->art_count,
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&priv->arts, true);
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if (result)
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goto free_priv;
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result = acpi_parse_trt(priv->adev->handle, &priv->trt_count,
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&priv->trts, true);
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if (result)
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goto free_art;
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platform_set_drvdata(pdev, priv);
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if (priv->uuid_bitmap & 1 << INT3400_THERMAL_PASSIVE_1) {
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int3400_thermal_ops.get_mode = int3400_thermal_get_mode;
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int3400_thermal_ops.set_mode = int3400_thermal_set_mode;
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}
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priv->thermal = thermal_zone_device_register("INT3400 Thermal", 0, 0,
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priv, &int3400_thermal_ops,
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&int3400_thermal_params, 0, 0);
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if (IS_ERR(priv->thermal)) {
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result = PTR_ERR(priv->thermal);
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goto free_trt;
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}
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priv->rel_misc_dev_res = acpi_thermal_rel_misc_device_add(
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priv->adev->handle);
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result = sysfs_create_group(&pdev->dev.kobj, &uuid_attribute_group);
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if (result)
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goto free_zone;
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return 0;
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free_zone:
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thermal_zone_device_unregister(priv->thermal);
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free_trt:
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kfree(priv->trts);
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free_art:
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kfree(priv->arts);
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free_priv:
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kfree(priv);
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return result;
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}
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static int int3400_thermal_remove(struct platform_device *pdev)
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{
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struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
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if (!priv->rel_misc_dev_res)
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acpi_thermal_rel_misc_device_remove(priv->adev->handle);
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sysfs_remove_group(&pdev->dev.kobj, &uuid_attribute_group);
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thermal_zone_device_unregister(priv->thermal);
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kfree(priv->trts);
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kfree(priv->arts);
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kfree(priv);
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return 0;
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}
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static const struct acpi_device_id int3400_thermal_match[] = {
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{"INT3400", 0},
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{}
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};
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MODULE_DEVICE_TABLE(acpi, int3400_thermal_match);
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static struct platform_driver int3400_thermal_driver = {
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.probe = int3400_thermal_probe,
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.remove = int3400_thermal_remove,
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.driver = {
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.name = "int3400 thermal",
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.acpi_match_table = ACPI_PTR(int3400_thermal_match),
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},
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};
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module_platform_driver(int3400_thermal_driver);
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MODULE_DESCRIPTION("INT3400 Thermal driver");
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MODULE_AUTHOR("Zhang Rui <rui.zhang@intel.com>");
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MODULE_LICENSE("GPL");
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