| /* |
| * 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 name_show(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; |
| } |
| |
| static ssize_t temp_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_temp, &eax, &edx); |
| if (err) |
| return -EAGAIN; |
| |
| return sprintf(buf, "%lu\n", ((unsigned long)eax & 0xffffff) * 1000); |
| } |
| |
| 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)); |
| } |
| |
| static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, SHOW_TEMP); |
| static SENSOR_DEVICE_ATTR_RO(temp1_label, name, SHOW_LABEL); |
| static SENSOR_DEVICE_ATTR_RO(name, name, 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"; |
| |
| if (c->x86 == 7) { |
| data->msr_temp = 0x1423; |
| } else { |
| 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; |
| } |
| |
| 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; |
| } |
| |
| 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; |
| } |
| |
| 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; |
| } |
| |
| 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 */ |
| { X86_VENDOR_CENTAUR, 7, X86_MODEL_ANY, }, |
| {} |
| }; |
| 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; |
| } |
| |
| static void __exit via_cputemp_exit(void) |
| { |
| cpuhp_remove_state(via_temp_online); |
| platform_driver_unregister(&via_cputemp_driver); |
| } |
| |
| 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) |