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![Thomas Gleixner](/assets/img/avatar_default.png)
The new macro set has a consistent namespace and uses C99 initializers instead of the grufty C89 ones. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Link: https://lkml.kernel.org/r/20200320131509.859324598@linutronix.de
329 lines
7.1 KiB
C
329 lines
7.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* via-cputemp.c - Driver for VIA CPU core temperature monitoring
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* Copyright (C) 2009 VIA Technologies, Inc.
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*
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* based on existing coretemp.c, which is
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*
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* Copyright (C) 2007 Rudolf Marek <r.marek@assembler.cz>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-vid.h>
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#include <linux/sysfs.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/err.h>
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#include <linux/mutex.h>
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#include <linux/list.h>
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#include <linux/platform_device.h>
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#include <linux/cpu.h>
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#include <asm/msr.h>
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#include <asm/processor.h>
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#include <asm/cpu_device_id.h>
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#define DRVNAME "via_cputemp"
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enum { SHOW_TEMP, SHOW_LABEL, SHOW_NAME };
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/*
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* Functions declaration
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*/
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struct via_cputemp_data {
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struct device *hwmon_dev;
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const char *name;
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u8 vrm;
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u32 id;
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u32 msr_temp;
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u32 msr_vid;
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};
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/*
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* Sysfs stuff
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*/
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static ssize_t name_show(struct device *dev, struct device_attribute *devattr,
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char *buf)
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{
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int ret;
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct via_cputemp_data *data = dev_get_drvdata(dev);
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if (attr->index == SHOW_NAME)
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ret = sprintf(buf, "%s\n", data->name);
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else /* show label */
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ret = sprintf(buf, "Core %d\n", data->id);
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return ret;
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}
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static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
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char *buf)
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{
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struct via_cputemp_data *data = dev_get_drvdata(dev);
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u32 eax, edx;
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int err;
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err = rdmsr_safe_on_cpu(data->id, data->msr_temp, &eax, &edx);
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if (err)
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return -EAGAIN;
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return sprintf(buf, "%lu\n", ((unsigned long)eax & 0xffffff) * 1000);
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}
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static ssize_t cpu0_vid_show(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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struct via_cputemp_data *data = dev_get_drvdata(dev);
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u32 eax, edx;
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int err;
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err = rdmsr_safe_on_cpu(data->id, data->msr_vid, &eax, &edx);
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if (err)
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return -EAGAIN;
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return sprintf(buf, "%d\n", vid_from_reg(~edx & 0x7f, data->vrm));
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}
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static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, SHOW_TEMP);
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static SENSOR_DEVICE_ATTR_RO(temp1_label, name, SHOW_LABEL);
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static SENSOR_DEVICE_ATTR_RO(name, name, SHOW_NAME);
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static struct attribute *via_cputemp_attributes[] = {
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&sensor_dev_attr_name.dev_attr.attr,
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&sensor_dev_attr_temp1_label.dev_attr.attr,
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&sensor_dev_attr_temp1_input.dev_attr.attr,
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NULL
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};
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static const struct attribute_group via_cputemp_group = {
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.attrs = via_cputemp_attributes,
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};
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/* Optional attributes */
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static DEVICE_ATTR_RO(cpu0_vid);
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static int via_cputemp_probe(struct platform_device *pdev)
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{
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struct via_cputemp_data *data;
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struct cpuinfo_x86 *c = &cpu_data(pdev->id);
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int err;
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u32 eax, edx;
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data = devm_kzalloc(&pdev->dev, sizeof(struct via_cputemp_data),
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GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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data->id = pdev->id;
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data->name = "via_cputemp";
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if (c->x86 == 7) {
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data->msr_temp = 0x1423;
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} else {
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switch (c->x86_model) {
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case 0xA:
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/* C7 A */
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case 0xD:
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/* C7 D */
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data->msr_temp = 0x1169;
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data->msr_vid = 0x198;
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break;
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case 0xF:
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/* Nano */
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data->msr_temp = 0x1423;
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break;
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default:
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return -ENODEV;
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}
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}
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/* test if we can access the TEMPERATURE MSR */
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err = rdmsr_safe_on_cpu(data->id, data->msr_temp, &eax, &edx);
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if (err) {
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dev_err(&pdev->dev,
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"Unable to access TEMPERATURE MSR, giving up\n");
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return err;
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}
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platform_set_drvdata(pdev, data);
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err = sysfs_create_group(&pdev->dev.kobj, &via_cputemp_group);
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if (err)
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return err;
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if (data->msr_vid)
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data->vrm = vid_which_vrm();
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if (data->vrm) {
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err = device_create_file(&pdev->dev, &dev_attr_cpu0_vid);
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if (err)
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goto exit_remove;
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}
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data->hwmon_dev = hwmon_device_register(&pdev->dev);
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if (IS_ERR(data->hwmon_dev)) {
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err = PTR_ERR(data->hwmon_dev);
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dev_err(&pdev->dev, "Class registration failed (%d)\n",
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err);
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goto exit_remove;
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}
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return 0;
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exit_remove:
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if (data->vrm)
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device_remove_file(&pdev->dev, &dev_attr_cpu0_vid);
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sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group);
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return err;
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}
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static int via_cputemp_remove(struct platform_device *pdev)
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{
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struct via_cputemp_data *data = platform_get_drvdata(pdev);
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hwmon_device_unregister(data->hwmon_dev);
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if (data->vrm)
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device_remove_file(&pdev->dev, &dev_attr_cpu0_vid);
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sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group);
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return 0;
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}
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static struct platform_driver via_cputemp_driver = {
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.driver = {
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.name = DRVNAME,
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},
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.probe = via_cputemp_probe,
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.remove = via_cputemp_remove,
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};
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struct pdev_entry {
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struct list_head list;
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struct platform_device *pdev;
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unsigned int cpu;
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};
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static LIST_HEAD(pdev_list);
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static DEFINE_MUTEX(pdev_list_mutex);
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static int via_cputemp_online(unsigned int cpu)
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{
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int err;
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struct platform_device *pdev;
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struct pdev_entry *pdev_entry;
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pdev = platform_device_alloc(DRVNAME, cpu);
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if (!pdev) {
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err = -ENOMEM;
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pr_err("Device allocation failed\n");
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goto exit;
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}
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pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL);
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if (!pdev_entry) {
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err = -ENOMEM;
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goto exit_device_put;
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}
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err = platform_device_add(pdev);
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if (err) {
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pr_err("Device addition failed (%d)\n", err);
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goto exit_device_free;
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}
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pdev_entry->pdev = pdev;
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pdev_entry->cpu = cpu;
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mutex_lock(&pdev_list_mutex);
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list_add_tail(&pdev_entry->list, &pdev_list);
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mutex_unlock(&pdev_list_mutex);
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return 0;
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exit_device_free:
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kfree(pdev_entry);
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exit_device_put:
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platform_device_put(pdev);
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exit:
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return err;
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}
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static int via_cputemp_down_prep(unsigned int cpu)
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{
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struct pdev_entry *p;
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mutex_lock(&pdev_list_mutex);
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list_for_each_entry(p, &pdev_list, list) {
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if (p->cpu == cpu) {
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platform_device_unregister(p->pdev);
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list_del(&p->list);
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mutex_unlock(&pdev_list_mutex);
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kfree(p);
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return 0;
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}
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}
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mutex_unlock(&pdev_list_mutex);
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return 0;
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}
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static const struct x86_cpu_id __initconst cputemp_ids[] = {
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X86_MATCH_VENDOR_FAM_MODEL(CENTAUR, 6, X86_CENTAUR_FAM6_C7_A, NULL),
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X86_MATCH_VENDOR_FAM_MODEL(CENTAUR, 6, X86_CENTAUR_FAM6_C7_D, NULL),
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X86_MATCH_VENDOR_FAM_MODEL(CENTAUR, 6, X86_CENTAUR_FAM6_NANO, NULL),
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X86_MATCH_VENDOR_FAM_MODEL(CENTAUR, 7, X86_MODEL_ANY, NULL),
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{}
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};
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MODULE_DEVICE_TABLE(x86cpu, cputemp_ids);
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static enum cpuhp_state via_temp_online;
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static int __init via_cputemp_init(void)
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{
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int err;
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if (!x86_match_cpu(cputemp_ids))
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return -ENODEV;
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err = platform_driver_register(&via_cputemp_driver);
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if (err)
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goto exit;
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err = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "hwmon/via:online",
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via_cputemp_online, via_cputemp_down_prep);
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if (err < 0)
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goto exit_driver_unreg;
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via_temp_online = err;
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#ifndef CONFIG_HOTPLUG_CPU
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if (list_empty(&pdev_list)) {
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err = -ENODEV;
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goto exit_hp_unreg;
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}
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#endif
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return 0;
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#ifndef CONFIG_HOTPLUG_CPU
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exit_hp_unreg:
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cpuhp_remove_state_nocalls(via_temp_online);
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#endif
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exit_driver_unreg:
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platform_driver_unregister(&via_cputemp_driver);
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exit:
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return err;
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}
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static void __exit via_cputemp_exit(void)
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{
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cpuhp_remove_state(via_temp_online);
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platform_driver_unregister(&via_cputemp_driver);
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}
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MODULE_AUTHOR("Harald Welte <HaraldWelte@viatech.com>");
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MODULE_DESCRIPTION("VIA CPU temperature monitor");
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MODULE_LICENSE("GPL");
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module_init(via_cputemp_init)
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module_exit(via_cputemp_exit)
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