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Release 4.14 drivers/hwmon/via-cputemp.c

Directory: drivers/hwmon
/*
 * via-cputemp.c - Driver for VIA CPU core temperature monitoring
 * Copyright (C) 2009 VIA Technologies, Inc.
 *
 * based on existing coretemp.c, which is
 *
 * Copyright (C) 2007 Rudolf Marek <r.marek@assembler.cz>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301 USA.
 */


#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/hwmon.h>
#include <linux/hwmon-vid.h>
#include <linux/sysfs.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/list.h>
#include <linux/platform_device.h>
#include <linux/cpu.h>
#include <asm/msr.h>
#include <asm/processor.h>
#include <asm/cpu_device_id.h>


#define DRVNAME	"via_cputemp"




enum { SHOW_TEMP, SHOW_LABEL, SHOW_NAME };

/*
 * Functions declaration
 */


struct via_cputemp_data {
	
struct device *hwmon_dev;
	
const char *name;
	
u8 vrm;
	
u32 id;
	
u32 msr_temp;
	
u32 msr_vid;
};

/*
 * Sysfs stuff
 */


static ssize_t show_name(struct device *dev, struct device_attribute *devattr, char *buf) { int ret; struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); struct via_cputemp_data *data = dev_get_drvdata(dev); if (attr->index == SHOW_NAME) ret = sprintf(buf, "%s\n", data->name); else /* show label */ ret = sprintf(buf, "Core %d\n", data->id); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Harald Welte82100.00%1100.00%
Total82100.00%1100.00%


static ssize_t show_temp(struct device *dev, struct device_attribute *devattr, char *buf) { struct via_cputemp_data *data = dev_get_drvdata(dev); u32 eax, edx; int err; err = rdmsr_safe_on_cpu(data->id, data->msr_temp, &eax, &edx); if (err) return -EAGAIN; return sprintf(buf, "%lu\n", ((unsigned long)eax & 0xffffff) * 1000); }

Contributors

PersonTokensPropCommitsCommitProp
Harald Welte8498.82%150.00%
Jean Delvare11.18%150.00%
Total85100.00%2100.00%


static ssize_t cpu0_vid_show(struct device *dev, struct device_attribute *devattr, char *buf) { struct via_cputemp_data *data = dev_get_drvdata(dev); u32 eax, edx; int err; err = rdmsr_safe_on_cpu(data->id, data->msr_vid, &eax, &edx); if (err) return -EAGAIN; return sprintf(buf, "%d\n", vid_from_reg(~edx & 0x7f, data->vrm)); }

Contributors

PersonTokensPropCommitsCommitProp
Jean Delvare8498.82%150.00%
Julia Lawall11.18%150.00%
Total85100.00%2100.00%

static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, SHOW_TEMP); static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_name, NULL, SHOW_LABEL); static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, SHOW_NAME); static struct attribute *via_cputemp_attributes[] = { &sensor_dev_attr_name.dev_attr.attr, &sensor_dev_attr_temp1_label.dev_attr.attr, &sensor_dev_attr_temp1_input.dev_attr.attr, NULL }; static const struct attribute_group via_cputemp_group = { .attrs = via_cputemp_attributes, }; /* Optional attributes */ static DEVICE_ATTR_RO(cpu0_vid);
static int via_cputemp_probe(struct platform_device *pdev) { struct via_cputemp_data *data; struct cpuinfo_x86 *c = &cpu_data(pdev->id); int err; u32 eax, edx; data = devm_kzalloc(&pdev->dev, sizeof(struct via_cputemp_data), GFP_KERNEL); if (!data) return -ENOMEM; data->id = pdev->id; data->name = "via_cputemp"; switch (c->x86_model) { case 0xA: /* C7 A */ case 0xD: /* C7 D */ data->msr_temp = 0x1169; data->msr_vid = 0x198; break; case 0xF: /* Nano */ data->msr_temp = 0x1423; break; default: return -ENODEV; } /* test if we can access the TEMPERATURE MSR */ err = rdmsr_safe_on_cpu(data->id, data->msr_temp, &eax, &edx); if (err) { dev_err(&pdev->dev, "Unable to access TEMPERATURE MSR, giving up\n"); return err; } platform_set_drvdata(pdev, data); err = sysfs_create_group(&pdev->dev.kobj, &via_cputemp_group); if (err) return err; if (data->msr_vid) data->vrm = vid_which_vrm(); if (data->vrm) { err = device_create_file(&pdev->dev, &dev_attr_cpu0_vid); if (err) goto exit_remove; } data->hwmon_dev = hwmon_device_register(&pdev->dev); if (IS_ERR(data->hwmon_dev)) { err = PTR_ERR(data->hwmon_dev); dev_err(&pdev->dev, "Class registration failed (%d)\n", err); goto exit_remove; } return 0; exit_remove: if (data->vrm) device_remove_file(&pdev->dev, &dev_attr_cpu0_vid); sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group); return err; }

Contributors

PersonTokensPropCommitsCommitProp
Harald Welte23473.82%133.33%
Jean Delvare6721.14%133.33%
Guenter Roeck165.05%133.33%
Total317100.00%3100.00%


static int via_cputemp_remove(struct platform_device *pdev) { struct via_cputemp_data *data = platform_get_drvdata(pdev); hwmon_device_unregister(data->hwmon_dev); if (data->vrm) device_remove_file(&pdev->dev, &dev_attr_cpu0_vid); sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Harald Welte4472.13%150.00%
Jean Delvare1727.87%150.00%
Total61100.00%2100.00%

static struct platform_driver via_cputemp_driver = { .driver = { .name = DRVNAME, }, .probe = via_cputemp_probe, .remove = via_cputemp_remove, }; struct pdev_entry { struct list_head list; struct platform_device *pdev; unsigned int cpu; }; static LIST_HEAD(pdev_list); static DEFINE_MUTEX(pdev_list_mutex);
static int via_cputemp_online(unsigned int cpu) { int err; struct platform_device *pdev; struct pdev_entry *pdev_entry; pdev = platform_device_alloc(DRVNAME, cpu); if (!pdev) { err = -ENOMEM; pr_err("Device allocation failed\n"); goto exit; } pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL); if (!pdev_entry) { err = -ENOMEM; goto exit_device_put; } err = platform_device_add(pdev); if (err) { pr_err("Device addition failed (%d)\n", err); goto exit_device_free; } pdev_entry->pdev = pdev; pdev_entry->cpu = cpu; mutex_lock(&pdev_list_mutex); list_add_tail(&pdev_entry->list, &pdev_list); mutex_unlock(&pdev_list_mutex); return 0; exit_device_free: kfree(pdev_entry); exit_device_put: platform_device_put(pdev); exit: return err; }

Contributors

PersonTokensPropCommitsCommitProp
Harald Welte15295.00%133.33%
Joe Perches74.38%133.33%
Sebastian Andrzej Siewior10.62%133.33%
Total160100.00%3100.00%


static int via_cputemp_down_prep(unsigned int cpu) { struct pdev_entry *p; mutex_lock(&pdev_list_mutex); list_for_each_entry(p, &pdev_list, list) { if (p->cpu == cpu) { platform_device_unregister(p->pdev); list_del(&p->list); mutex_unlock(&pdev_list_mutex); kfree(p); return 0; } } mutex_unlock(&pdev_list_mutex); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Harald Welte6683.54%133.33%
Jan Beulich78.86%133.33%
Sebastian Andrzej Siewior67.59%133.33%
Total79100.00%3100.00%

static const struct x86_cpu_id __initconst cputemp_ids[] = { { X86_VENDOR_CENTAUR, 6, 0xa, }, /* C7 A */ { X86_VENDOR_CENTAUR, 6, 0xd, }, /* C7 D */ { X86_VENDOR_CENTAUR, 6, 0xf, }, /* Nano */ {} }; MODULE_DEVICE_TABLE(x86cpu, cputemp_ids); static enum cpuhp_state via_temp_online;
static int __init via_cputemp_init(void) { int err; if (!x86_match_cpu(cputemp_ids)) return -ENODEV; err = platform_driver_register(&via_cputemp_driver); if (err) goto exit; err = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "hwmon/via:online", via_cputemp_online, via_cputemp_down_prep); if (err < 0) goto exit_driver_unreg; via_temp_online = err; #ifndef CONFIG_HOTPLUG_CPU if (list_empty(&pdev_list)) { err = -ENODEV; goto exit_hp_unreg; } #endif return 0; #ifndef CONFIG_HOTPLUG_CPU exit_hp_unreg: cpuhp_remove_state_nocalls(via_temp_online); #endif exit_driver_unreg: platform_driver_unregister(&via_cputemp_driver); exit: return err; }

Contributors

PersonTokensPropCommitsCommitProp
Harald Welte7060.34%125.00%
Sebastian Andrzej Siewior3328.45%125.00%
Jan Beulich86.90%125.00%
Andi Kleen54.31%125.00%
Total116100.00%4100.00%


static void __exit via_cputemp_exit(void) { cpuhp_remove_state(via_temp_online); platform_driver_unregister(&via_cputemp_driver); }

Contributors

PersonTokensPropCommitsCommitProp
Harald Welte1890.00%150.00%
Sebastian Andrzej Siewior210.00%150.00%
Total20100.00%2100.00%

MODULE_AUTHOR("Harald Welte <HaraldWelte@viatech.com>"); MODULE_DESCRIPTION("VIA CPU temperature monitor"); MODULE_LICENSE("GPL"); module_init(via_cputemp_init) module_exit(via_cputemp_exit)

Overall Contributors

PersonTokensPropCommitsCommitProp
Harald Welte99274.87%111.11%
Jean Delvare18513.96%111.11%
Andi Kleen534.00%111.11%
Sebastian Andrzej Siewior473.55%111.11%
Jan Beulich161.21%222.22%
Guenter Roeck161.21%111.11%
Joe Perches141.06%111.11%
Julia Lawall20.15%111.11%
Total1325100.00%9100.00%
Directory: drivers/hwmon
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