Signed-off-by: LeoLiu-oc
<LeoLiu-oc@zhaoxin.com>
---
drivers/hwmon/Kconfig | 9 +
drivers/hwmon/Makefile | 1 +
drivers/hwmon/via-cputemp.c | 1 -
drivers/hwmon/zhaoxin-cputemp.c | 292
++++++++++++++++++++++++++++++++
4 files changed, 302 insertions(+), 1 deletion(-)
create mode 100644 drivers/hwmon/zhaoxin-cputemp.c
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 0c2b032ee617..c11c3c46898a 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -1889,6 +1889,15 @@ config SENSORS_VIA_CPUTEMP
sensor inside your CPU. Supported are all known variants of
the VIA C7 and Nano.
+config SENSORS_ZHAOXIN_CPUTEMP
+ tristate "Zhaoxin CPU temperature sensor"
+ depends on X86
+ select HWMON_VID
+ help
+ If you say yes here you get support for the temperature
+ sensor inside your CPU. Supported are all known variants of
+ the Zhaoxin processors.
+
config SENSORS_VIA686A
tristate "VIA686A"
depends on PCI
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 9db2903b61e5..2427687972c9 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -184,6 +184,7 @@ obj-$(CONFIG_SENSORS_TMP421) += tmp421.o
obj-$(CONFIG_SENSORS_TMP513) += tmp513.o
obj-$(CONFIG_SENSORS_VEXPRESS) += vexpress-hwmon.o
obj-$(CONFIG_SENSORS_VIA_CPUTEMP)+= via-cputemp.o
+obj-$(CONFIG_SENSORS_ZHAOXIN_CPUTEMP) += zhaoxin-cputemp.o
obj-$(CONFIG_SENSORS_VIA686A) += via686a.o
obj-$(CONFIG_SENSORS_VT1211) += vt1211.o
obj-$(CONFIG_SENSORS_VT8231) += vt8231.o
diff --git a/drivers/hwmon/via-cputemp.c
b/drivers/hwmon/via-cputemp.c
index e5d18dac8ee7..0a5057dbe51a 100644
--- a/drivers/hwmon/via-cputemp.c
+++ b/drivers/hwmon/via-cputemp.c
@@ -273,7 +273,6 @@ static const struct x86_cpu_id __initconst
cputemp_ids[] = {
X86_MATCH_VENDOR_FAM_MODEL(CENTAUR, 6,
X86_CENTAUR_FAM6_C7_A, NULL),
X86_MATCH_VENDOR_FAM_MODEL(CENTAUR, 6,
X86_CENTAUR_FAM6_C7_D, NULL),
X86_MATCH_VENDOR_FAM_MODEL(CENTAUR, 6,
X86_CENTAUR_FAM6_NANO, NULL),
- X86_MATCH_VENDOR_FAM_MODEL(CENTAUR, 7, X86_MODEL_ANY, NULL),
{}
};
MODULE_DEVICE_TABLE(x86cpu, cputemp_ids);
diff --git a/drivers/hwmon/zhaoxin-cputemp.c
b/drivers/hwmon/zhaoxin-cputemp.c
new file mode 100644
index 000000000000..dcedb51515f0
--- /dev/null
+++ b/drivers/hwmon/zhaoxin-cputemp.c
@@ -0,0 +1,292 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * zhaoxin-cputemp.c - Driver for Zhaoxin CPU core temperature
monitoring
+ */
+
+#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 "zhaoxin_cputemp"
+
+enum { SHOW_TEMP, SHOW_LABEL, SHOW_NAME };
+
+/* Functions declaration */
+
+struct zhaoxin_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 zhaoxin_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 zhaoxin_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 zhaoxin_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 *zhaoxin_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 zhaoxin_cputemp_group = {
+ .attrs = zhaoxin_cputemp_attributes,
+};
+
+/* Optional attributes */
+static DEVICE_ATTR_RO(cpu0_vid);
+
+static int zhaoxin_cputemp_probe(struct platform_device *pdev)
+{
+ struct zhaoxin_cputemp_data *data;
+ int err;
+ u32 eax, edx;
+
+ data = devm_kzalloc(&pdev->dev, sizeof(struct
zhaoxin_cputemp_data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->id = pdev->id;
+ data->name = "zhaoxin_cputemp";
+ data->msr_temp = 0x1423;
+
+ /* 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,
&zhaoxin_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,
&zhaoxin_cputemp_group);
+ return err;
+}
+
+static int zhaoxin_cputemp_remove(struct platform_device *pdev)
+{
+ struct zhaoxin_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,
&zhaoxin_cputemp_group);
+ return 0;
+}
+
+static struct platform_driver zhaoxin_cputemp_driver = {
+ .driver = {
+ .name = DRVNAME,
+ },
+ .probe = zhaoxin_cputemp_probe,
+ .remove = zhaoxin_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 zhaoxin_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 zhaoxin_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_MATCH_VENDOR_FAM_MODEL(CENTAUR, 7, X86_MODEL_ANY, NULL),
+ X86_MATCH_VENDOR_FAM_MODEL(ZHAOXIN, 7, X86_MODEL_ANY, NULL),
+ {}
+};
+MODULE_DEVICE_TABLE(x86cpu, cputemp_ids);
+
+static enum cpuhp_state zhaoxin_temp_online;
+
+static int __init zhaoxin_cputemp_init(void)
+{
+ int err;
+
+ if (!x86_match_cpu(cputemp_ids))
+ return -ENODEV;
+
+ err = platform_driver_register(&zhaoxin_cputemp_driver);
+ if (err)
+ goto exit;
+
+ err = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN,
"hwmon/zhaoxin:online",
+ zhaoxin_cputemp_online,
zhaoxin_cputemp_down_prep);
+ if (err < 0)
+ goto exit_driver_unreg;
+ zhaoxin_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(zhaoxin_temp_online);
+#endif
+exit_driver_unreg:
+ platform_driver_unregister(&zhaoxin_cputemp_driver);
+exit:
+ return err;
+}
+
+static void __exit zhaoxin_cputemp_exit(void)
+{
+ cpuhp_remove_state(zhaoxin_temp_online);
+ platform_driver_unregister(&zhaoxin_cputemp_driver);
+}
+
+MODULE_DESCRIPTION("Zhaoxin CPU temperature monitor");
+MODULE_LICENSE("GPL");
+
+module_init(zhaoxin_cputemp_init)
+module_exit(zhaoxin_cputemp_exit)
--
2.20.1