524 lines
12 KiB
C
524 lines
12 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Intel menlow Driver for thermal management extension
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*
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* Copyright (C) 2008 Intel Corp
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* Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
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* Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
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*
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* This driver creates the sys I/F for programming the sensors.
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* It also implements the driver for intel menlow memory controller (hardware
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* id is INT0002) which makes use of the platform specific ACPI methods
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* to get/set bandwidth.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/acpi.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/pm.h>
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#include <linux/slab.h>
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#include <linux/thermal.h>
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#include <linux/types.h>
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#include <linux/units.h>
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MODULE_AUTHOR("Thomas Sujith");
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MODULE_AUTHOR("Zhang Rui");
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MODULE_DESCRIPTION("Intel Menlow platform specific driver");
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MODULE_LICENSE("GPL v2");
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/*
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* Memory controller device control
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*/
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#define MEMORY_GET_BANDWIDTH "GTHS"
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#define MEMORY_SET_BANDWIDTH "STHS"
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#define MEMORY_ARG_CUR_BANDWIDTH 1
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#define MEMORY_ARG_MAX_BANDWIDTH 0
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static void intel_menlow_unregister_sensor(void);
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/*
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* GTHS returning 'n' would mean that [0,n-1] states are supported
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* In that case max_cstate would be n-1
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* GTHS returning '0' would mean that no bandwidth control states are supported
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*/
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static int memory_get_max_bandwidth(struct thermal_cooling_device *cdev,
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unsigned long *max_state)
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{
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struct acpi_device *device = cdev->devdata;
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acpi_handle handle = device->handle;
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unsigned long long value;
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struct acpi_object_list arg_list;
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union acpi_object arg;
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acpi_status status = AE_OK;
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arg_list.count = 1;
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arg_list.pointer = &arg;
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arg.type = ACPI_TYPE_INTEGER;
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arg.integer.value = MEMORY_ARG_MAX_BANDWIDTH;
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status = acpi_evaluate_integer(handle, MEMORY_GET_BANDWIDTH,
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&arg_list, &value);
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if (ACPI_FAILURE(status))
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return -EFAULT;
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if (!value)
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return -EINVAL;
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*max_state = value - 1;
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return 0;
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}
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static int memory_get_cur_bandwidth(struct thermal_cooling_device *cdev,
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unsigned long *value)
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{
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struct acpi_device *device = cdev->devdata;
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acpi_handle handle = device->handle;
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unsigned long long result;
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struct acpi_object_list arg_list;
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union acpi_object arg;
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acpi_status status = AE_OK;
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arg_list.count = 1;
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arg_list.pointer = &arg;
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arg.type = ACPI_TYPE_INTEGER;
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arg.integer.value = MEMORY_ARG_CUR_BANDWIDTH;
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status = acpi_evaluate_integer(handle, MEMORY_GET_BANDWIDTH,
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&arg_list, &result);
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if (ACPI_FAILURE(status))
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return -EFAULT;
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*value = result;
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return 0;
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}
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static int memory_set_cur_bandwidth(struct thermal_cooling_device *cdev,
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unsigned long state)
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{
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struct acpi_device *device = cdev->devdata;
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acpi_handle handle = device->handle;
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struct acpi_object_list arg_list;
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union acpi_object arg;
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acpi_status status;
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unsigned long long temp;
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unsigned long max_state;
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if (memory_get_max_bandwidth(cdev, &max_state))
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return -EFAULT;
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if (state > max_state)
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return -EINVAL;
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arg_list.count = 1;
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arg_list.pointer = &arg;
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arg.type = ACPI_TYPE_INTEGER;
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arg.integer.value = state;
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status =
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acpi_evaluate_integer(handle, MEMORY_SET_BANDWIDTH, &arg_list,
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&temp);
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pr_info("Bandwidth value was %ld: status is %d\n", state, status);
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if (ACPI_FAILURE(status))
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return -EFAULT;
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return 0;
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}
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static const struct thermal_cooling_device_ops memory_cooling_ops = {
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.get_max_state = memory_get_max_bandwidth,
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.get_cur_state = memory_get_cur_bandwidth,
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.set_cur_state = memory_set_cur_bandwidth,
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};
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/*
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* Memory Device Management
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*/
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static int intel_menlow_memory_add(struct acpi_device *device)
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{
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int result = -ENODEV;
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struct thermal_cooling_device *cdev;
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if (!device)
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return -EINVAL;
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if (!acpi_has_method(device->handle, MEMORY_GET_BANDWIDTH))
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goto end;
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if (!acpi_has_method(device->handle, MEMORY_SET_BANDWIDTH))
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goto end;
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cdev = thermal_cooling_device_register("Memory controller", device,
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&memory_cooling_ops);
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if (IS_ERR(cdev)) {
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result = PTR_ERR(cdev);
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goto end;
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}
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device->driver_data = cdev;
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result = sysfs_create_link(&device->dev.kobj,
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&cdev->device.kobj, "thermal_cooling");
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if (result)
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goto unregister;
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result = sysfs_create_link(&cdev->device.kobj,
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&device->dev.kobj, "device");
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if (result) {
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sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
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goto unregister;
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}
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end:
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return result;
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unregister:
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thermal_cooling_device_unregister(cdev);
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return result;
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}
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static int intel_menlow_memory_remove(struct acpi_device *device)
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{
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struct thermal_cooling_device *cdev;
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if (!device)
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return -EINVAL;
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cdev = acpi_driver_data(device);
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if (!cdev)
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return -EINVAL;
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sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
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sysfs_remove_link(&cdev->device.kobj, "device");
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thermal_cooling_device_unregister(cdev);
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return 0;
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}
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static const struct acpi_device_id intel_menlow_memory_ids[] = {
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{"INT0002", 0},
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{"", 0},
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};
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static struct acpi_driver intel_menlow_memory_driver = {
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.name = "intel_menlow_thermal_control",
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.ids = intel_menlow_memory_ids,
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.ops = {
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.add = intel_menlow_memory_add,
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.remove = intel_menlow_memory_remove,
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},
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};
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/*
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* Sensor control on menlow platform
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*/
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#define THERMAL_AUX0 0
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#define THERMAL_AUX1 1
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#define GET_AUX0 "GAX0"
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#define GET_AUX1 "GAX1"
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#define SET_AUX0 "SAX0"
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#define SET_AUX1 "SAX1"
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struct intel_menlow_attribute {
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struct device_attribute attr;
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struct device *device;
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acpi_handle handle;
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struct list_head node;
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};
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static LIST_HEAD(intel_menlow_attr_list);
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static DEFINE_MUTEX(intel_menlow_attr_lock);
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/*
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* sensor_get_auxtrip - get the current auxtrip value from sensor
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* @name: Thermalzone name
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* @auxtype : AUX0/AUX1
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* @buf: syfs buffer
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*/
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static int sensor_get_auxtrip(acpi_handle handle, int index,
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unsigned long long *value)
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{
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acpi_status status;
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if ((index != 0 && index != 1) || !value)
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return -EINVAL;
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status = acpi_evaluate_integer(handle, index ? GET_AUX1 : GET_AUX0,
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NULL, value);
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if (ACPI_FAILURE(status))
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return -EIO;
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return 0;
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}
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/*
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* sensor_set_auxtrip - set the new auxtrip value to sensor
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* @name: Thermalzone name
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* @auxtype : AUX0/AUX1
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* @buf: syfs buffer
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*/
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static int sensor_set_auxtrip(acpi_handle handle, int index, int value)
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{
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acpi_status status;
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union acpi_object arg = {
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ACPI_TYPE_INTEGER
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};
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struct acpi_object_list args = {
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1, &arg
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};
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unsigned long long temp;
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if (index != 0 && index != 1)
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return -EINVAL;
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status = acpi_evaluate_integer(handle, index ? GET_AUX0 : GET_AUX1,
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NULL, &temp);
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if (ACPI_FAILURE(status))
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return -EIO;
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if ((index && value < temp) || (!index && value > temp))
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return -EINVAL;
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arg.integer.value = value;
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status = acpi_evaluate_integer(handle, index ? SET_AUX1 : SET_AUX0,
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&args, &temp);
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if (ACPI_FAILURE(status))
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return -EIO;
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/* do we need to check the return value of SAX0/SAX1 ? */
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return 0;
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}
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#define to_intel_menlow_attr(_attr) \
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container_of(_attr, struct intel_menlow_attribute, attr)
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static ssize_t aux_show(struct device *dev, struct device_attribute *dev_attr,
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char *buf, int idx)
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{
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struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
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unsigned long long value;
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int result;
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result = sensor_get_auxtrip(attr->handle, idx, &value);
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if (result)
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return result;
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return sprintf(buf, "%lu", deci_kelvin_to_celsius(value));
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}
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static ssize_t aux0_show(struct device *dev,
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struct device_attribute *dev_attr, char *buf)
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{
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return aux_show(dev, dev_attr, buf, 0);
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}
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static ssize_t aux1_show(struct device *dev,
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struct device_attribute *dev_attr, char *buf)
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{
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return aux_show(dev, dev_attr, buf, 1);
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}
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static ssize_t aux_store(struct device *dev, struct device_attribute *dev_attr,
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const char *buf, size_t count, int idx)
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{
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struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
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int value;
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int result;
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/*Sanity check; should be a positive integer */
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if (!sscanf(buf, "%d", &value))
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return -EINVAL;
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if (value < 0)
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return -EINVAL;
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result = sensor_set_auxtrip(attr->handle, idx,
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celsius_to_deci_kelvin(value));
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return result ? result : count;
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}
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static ssize_t aux0_store(struct device *dev,
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struct device_attribute *dev_attr,
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const char *buf, size_t count)
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{
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return aux_store(dev, dev_attr, buf, count, 0);
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}
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static ssize_t aux1_store(struct device *dev,
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struct device_attribute *dev_attr,
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const char *buf, size_t count)
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{
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return aux_store(dev, dev_attr, buf, count, 1);
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}
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/* BIOS can enable/disable the thermal user application in dabney platform */
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#define BIOS_ENABLED "\\_TZ.GSTS"
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static ssize_t bios_enabled_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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acpi_status status;
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unsigned long long bios_enabled;
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status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &bios_enabled);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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return sprintf(buf, "%s\n", bios_enabled ? "enabled" : "disabled");
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}
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static int intel_menlow_add_one_attribute(char *name, umode_t mode, void *show,
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void *store, struct device *dev,
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acpi_handle handle)
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{
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struct intel_menlow_attribute *attr;
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int result;
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attr = kzalloc(sizeof(struct intel_menlow_attribute), GFP_KERNEL);
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if (!attr)
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return -ENOMEM;
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sysfs_attr_init(&attr->attr.attr); /* That is consistent naming :D */
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attr->attr.attr.name = name;
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attr->attr.attr.mode = mode;
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attr->attr.show = show;
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attr->attr.store = store;
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attr->device = dev;
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|
|
attr->handle = handle;
|
||
|
|
|
||
|
|
result = device_create_file(dev, &attr->attr);
|
||
|
|
if (result) {
|
||
|
|
kfree(attr);
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
mutex_lock(&intel_menlow_attr_lock);
|
||
|
|
list_add_tail(&attr->node, &intel_menlow_attr_list);
|
||
|
|
mutex_unlock(&intel_menlow_attr_lock);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static acpi_status intel_menlow_register_sensor(acpi_handle handle, u32 lvl,
|
||
|
|
void *context, void **rv)
|
||
|
|
{
|
||
|
|
acpi_status status;
|
||
|
|
acpi_handle dummy;
|
||
|
|
struct thermal_zone_device *thermal;
|
||
|
|
int result;
|
||
|
|
|
||
|
|
result = acpi_bus_get_private_data(handle, (void **)&thermal);
|
||
|
|
if (result)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
/* _TZ must have the AUX0/1 methods */
|
||
|
|
status = acpi_get_handle(handle, GET_AUX0, &dummy);
|
||
|
|
if (ACPI_FAILURE(status))
|
||
|
|
return (status == AE_NOT_FOUND) ? AE_OK : status;
|
||
|
|
|
||
|
|
status = acpi_get_handle(handle, SET_AUX0, &dummy);
|
||
|
|
if (ACPI_FAILURE(status))
|
||
|
|
return (status == AE_NOT_FOUND) ? AE_OK : status;
|
||
|
|
|
||
|
|
result = intel_menlow_add_one_attribute("aux0", 0644,
|
||
|
|
aux0_show, aux0_store,
|
||
|
|
&thermal->device, handle);
|
||
|
|
if (result)
|
||
|
|
return AE_ERROR;
|
||
|
|
|
||
|
|
status = acpi_get_handle(handle, GET_AUX1, &dummy);
|
||
|
|
if (ACPI_FAILURE(status))
|
||
|
|
goto aux1_not_found;
|
||
|
|
|
||
|
|
status = acpi_get_handle(handle, SET_AUX1, &dummy);
|
||
|
|
if (ACPI_FAILURE(status))
|
||
|
|
goto aux1_not_found;
|
||
|
|
|
||
|
|
result = intel_menlow_add_one_attribute("aux1", 0644,
|
||
|
|
aux1_show, aux1_store,
|
||
|
|
&thermal->device, handle);
|
||
|
|
if (result) {
|
||
|
|
intel_menlow_unregister_sensor();
|
||
|
|
return AE_ERROR;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* create the "dabney_enabled" attribute which means the user app
|
||
|
|
* should be loaded or not
|
||
|
|
*/
|
||
|
|
|
||
|
|
result = intel_menlow_add_one_attribute("bios_enabled", 0444,
|
||
|
|
bios_enabled_show, NULL,
|
||
|
|
&thermal->device, handle);
|
||
|
|
if (result) {
|
||
|
|
intel_menlow_unregister_sensor();
|
||
|
|
return AE_ERROR;
|
||
|
|
}
|
||
|
|
|
||
|
|
return AE_OK;
|
||
|
|
|
||
|
|
aux1_not_found:
|
||
|
|
if (status == AE_NOT_FOUND)
|
||
|
|
return AE_OK;
|
||
|
|
|
||
|
|
intel_menlow_unregister_sensor();
|
||
|
|
return status;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void intel_menlow_unregister_sensor(void)
|
||
|
|
{
|
||
|
|
struct intel_menlow_attribute *pos, *next;
|
||
|
|
|
||
|
|
mutex_lock(&intel_menlow_attr_lock);
|
||
|
|
list_for_each_entry_safe(pos, next, &intel_menlow_attr_list, node) {
|
||
|
|
list_del(&pos->node);
|
||
|
|
device_remove_file(pos->device, &pos->attr);
|
||
|
|
kfree(pos);
|
||
|
|
}
|
||
|
|
mutex_unlock(&intel_menlow_attr_lock);
|
||
|
|
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int __init intel_menlow_module_init(void)
|
||
|
|
{
|
||
|
|
int result = -ENODEV;
|
||
|
|
acpi_status status;
|
||
|
|
unsigned long long enable;
|
||
|
|
|
||
|
|
if (acpi_disabled)
|
||
|
|
return result;
|
||
|
|
|
||
|
|
/* Looking for the \_TZ.GSTS method */
|
||
|
|
status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &enable);
|
||
|
|
if (ACPI_FAILURE(status) || !enable)
|
||
|
|
return -ENODEV;
|
||
|
|
|
||
|
|
/* Looking for ACPI device MEM0 with hardware id INT0002 */
|
||
|
|
result = acpi_bus_register_driver(&intel_menlow_memory_driver);
|
||
|
|
if (result)
|
||
|
|
return result;
|
||
|
|
|
||
|
|
/* Looking for sensors in each ACPI thermal zone */
|
||
|
|
status = acpi_walk_namespace(ACPI_TYPE_THERMAL, ACPI_ROOT_OBJECT,
|
||
|
|
ACPI_UINT32_MAX,
|
||
|
|
intel_menlow_register_sensor, NULL, NULL, NULL);
|
||
|
|
if (ACPI_FAILURE(status)) {
|
||
|
|
acpi_bus_unregister_driver(&intel_menlow_memory_driver);
|
||
|
|
return -ENODEV;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void __exit intel_menlow_module_exit(void)
|
||
|
|
{
|
||
|
|
acpi_bus_unregister_driver(&intel_menlow_memory_driver);
|
||
|
|
intel_menlow_unregister_sensor();
|
||
|
|
}
|
||
|
|
|
||
|
|
module_init(intel_menlow_module_init);
|
||
|
|
module_exit(intel_menlow_module_exit);
|