[deliverable/linux.git] / drivers / platform / mips / cpu_hwmon.c

#include <linux/err.h>
#include <linux/module.h>
#include <linux/reboot.h>
#include <linux/jiffies.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>

#include <loongson.h>
#include <boot_param.h>
#include <loongson_hwmon.h>

/*
 * Loongson-3 series cpu has two sensors inside,
 * each of them from 0 to 255,
 * if more than 127, that is dangerous.
 * here only provide sensor1 data, because it always hot than sensor0
 */
int loongson3_cpu_temp(int cpu)
{
	u32 reg;

	reg = LOONGSON_CHIPTEMP(cpu);
	if ((read_c0_prid() & PRID_REV_MASK) == PRID_REV_LOONGSON3A_R1)
		reg = (reg >> 8) & 0xff;
	else
		reg = ((reg >> 8) & 0xff) - 100;

	return (int)reg * 1000;
}

static struct device *cpu_hwmon_dev;

static ssize_t get_hwmon_name(struct device *dev,
			struct device_attribute *attr, char *buf);
static SENSOR_DEVICE_ATTR(name, S_IRUGO, get_hwmon_name, NULL, 0);

static struct attribute *cpu_hwmon_attributes[] = {
	&sensor_dev_attr_name.dev_attr.attr,
	NULL
};

/* Hwmon device attribute group */
static struct attribute_group cpu_hwmon_attribute_group = {
	.attrs = cpu_hwmon_attributes,
};

/* Hwmon device get name */
static ssize_t get_hwmon_name(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	return sprintf(buf, "cpu-hwmon\n");
}

static ssize_t get_cpu0_temp(struct device *dev,
			struct device_attribute *attr, char *buf);
static ssize_t get_cpu1_temp(struct device *dev,
			struct device_attribute *attr, char *buf);
static ssize_t cpu0_temp_label(struct device *dev,
			struct device_attribute *attr, char *buf);
static ssize_t cpu1_temp_label(struct device *dev,
			struct device_attribute *attr, char *buf);

static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, get_cpu0_temp, NULL, 1);
static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, cpu0_temp_label, NULL, 1);
static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, get_cpu1_temp, NULL, 2);
static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, cpu1_temp_label, NULL, 2);

static const struct attribute *hwmon_cputemp1[] = {
	&sensor_dev_attr_temp1_input.dev_attr.attr,
	&sensor_dev_attr_temp1_label.dev_attr.attr,
	NULL
};

static const struct attribute *hwmon_cputemp2[] = {
	&sensor_dev_attr_temp2_input.dev_attr.attr,
	&sensor_dev_attr_temp2_label.dev_attr.attr,
	NULL
};

static ssize_t cpu0_temp_label(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	return sprintf(buf, "CPU 0 Temperature\n");
}

static ssize_t cpu1_temp_label(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	return sprintf(buf, "CPU 1 Temperature\n");
}

static ssize_t get_cpu0_temp(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	int value = loongson3_cpu_temp(0);
	return sprintf(buf, "%d\n", value);
}

static ssize_t get_cpu1_temp(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	int value = loongson3_cpu_temp(1);
	return sprintf(buf, "%d\n", value);
}

static int create_sysfs_cputemp_files(struct kobject *kobj)
{
	int ret;

	ret = sysfs_create_files(kobj, hwmon_cputemp1);
	if (ret)
		goto sysfs_create_temp1_fail;

	if (loongson_sysconf.nr_cpus <= loongson_sysconf.cores_per_package)
		return 0;

	ret = sysfs_create_files(kobj, hwmon_cputemp2);
	if (ret)
		goto sysfs_create_temp2_fail;

	return 0;

sysfs_create_temp2_fail:
	sysfs_remove_files(kobj, hwmon_cputemp1);

sysfs_create_temp1_fail:
	return -1;
}

static void remove_sysfs_cputemp_files(struct kobject *kobj)
{
	sysfs_remove_files(&cpu_hwmon_dev->kobj, hwmon_cputemp1);

	if (loongson_sysconf.nr_cpus > loongson_sysconf.cores_per_package)
		sysfs_remove_files(&cpu_hwmon_dev->kobj, hwmon_cputemp2);
}

#define CPU_THERMAL_THRESHOLD 90000
static struct delayed_work thermal_work;

static void do_thermal_timer(struct work_struct *work)
{
	int value = loongson3_cpu_temp(0);
	if (value <= CPU_THERMAL_THRESHOLD)
		schedule_delayed_work(&thermal_work, msecs_to_jiffies(5000));
	else
		orderly_poweroff(true);
}

static int __init loongson_hwmon_init(void)
{
	int ret;

	pr_info("Loongson Hwmon Enter...\n");

	cpu_hwmon_dev = hwmon_device_register(NULL);
	if (IS_ERR(cpu_hwmon_dev)) {
		ret = -ENOMEM;
		pr_err("hwmon_device_register fail!\n");
		goto fail_hwmon_device_register;
	}

	ret = sysfs_create_group(&cpu_hwmon_dev->kobj,
				&cpu_hwmon_attribute_group);
	if (ret) {
		pr_err("fail to create loongson hwmon!\n");
		goto fail_sysfs_create_group_hwmon;
	}

	ret = create_sysfs_cputemp_files(&cpu_hwmon_dev->kobj);
	if (ret) {
		pr_err("fail to create cpu temperature interface!\n");
		goto fail_create_sysfs_cputemp_files;
	}

	INIT_DEFERRABLE_WORK(&thermal_work, do_thermal_timer);
	schedule_delayed_work(&thermal_work, msecs_to_jiffies(20000));

	return ret;

fail_create_sysfs_cputemp_files:
	sysfs_remove_group(&cpu_hwmon_dev->kobj,
				&cpu_hwmon_attribute_group);

fail_sysfs_create_group_hwmon:
	hwmon_device_unregister(cpu_hwmon_dev);

fail_hwmon_device_register:
	return ret;
}

static void __exit loongson_hwmon_exit(void)
{
	cancel_delayed_work_sync(&thermal_work);
	remove_sysfs_cputemp_files(&cpu_hwmon_dev->kobj);
	sysfs_remove_group(&cpu_hwmon_dev->kobj,
				&cpu_hwmon_attribute_group);
	hwmon_device_unregister(cpu_hwmon_dev);
}

module_init(loongson_hwmon_init);
module_exit(loongson_hwmon_exit);

MODULE_AUTHOR("Yu Xiang <xiangy@lemote.com>");
MODULE_AUTHOR("Huacai Chen <chenhc@lemote.com>");
MODULE_DESCRIPTION("Loongson CPU Hwmon driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
64f09aa9 HC	1	#include <linux/err.h>
	2	#include <linux/module.h>
	3	#include <linux/reboot.h>
	4	#include <linux/jiffies.h>
	5	#include <linux/hwmon.h>
	6	#include <linux/hwmon-sysfs.h>
	7
	8	#include <loongson.h>
	9	#include <boot_param.h>
	10	#include <loongson_hwmon.h>
	11
	12	/*
	13	* Loongson-3 series cpu has two sensors inside,
	14	* each of them from 0 to 255,
	15	* if more than 127, that is dangerous.
	16	* here only provide sensor1 data, because it always hot than sensor0
	17	*/
	18	int loongson3_cpu_temp(int cpu)
	19	{
	20	u32 reg;
	21
	22	reg = LOONGSON_CHIPTEMP(cpu);
b2edcfc8	23	if ((read_c0_prid() & PRID_REV_MASK) == PRID_REV_LOONGSON3A_R1)
64f09aa9	24	reg = (reg >> 8) & 0xff;
b2edcfc8	25	else
64f09aa9 HC	26	reg = ((reg >> 8) & 0xff) - 100;
	27
	28	return (int)reg * 1000;
	29	}
	30
	31	static struct device *cpu_hwmon_dev;
	32
	33	static ssize_t get_hwmon_name(struct device *dev,
	34	struct device_attribute attr, char buf);
	35	static SENSOR_DEVICE_ATTR(name, S_IRUGO, get_hwmon_name, NULL, 0);
	36
	37	static struct attribute *cpu_hwmon_attributes[] = {
	38	&sensor_dev_attr_name.dev_attr.attr,
	39	NULL
	40	};
	41
	42	/* Hwmon device attribute group */
	43	static struct attribute_group cpu_hwmon_attribute_group = {
	44	.attrs = cpu_hwmon_attributes,
	45	};
	46
	47	/* Hwmon device get name */
	48	static ssize_t get_hwmon_name(struct device *dev,
	49	struct device_attribute attr, char buf)
	50	{
	51	return sprintf(buf, "cpu-hwmon\n");
	52	}
	53
	54	static ssize_t get_cpu0_temp(struct device *dev,
	55	struct device_attribute attr, char buf);
	56	static ssize_t get_cpu1_temp(struct device *dev,
	57	struct device_attribute attr, char buf);
	58	static ssize_t cpu0_temp_label(struct device *dev,
	59	struct device_attribute attr, char buf);
	60	static ssize_t cpu1_temp_label(struct device *dev,
	61	struct device_attribute attr, char buf);
	62
	63	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, get_cpu0_temp, NULL, 1);
	64	static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, cpu0_temp_label, NULL, 1);
	65	static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, get_cpu1_temp, NULL, 2);
	66	static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, cpu1_temp_label, NULL, 2);
	67
	68	static const struct attribute *hwmon_cputemp1[] = {
	69	&sensor_dev_attr_temp1_input.dev_attr.attr,
	70	&sensor_dev_attr_temp1_label.dev_attr.attr,
	71	NULL
	72	};
	73
	74	static const struct attribute *hwmon_cputemp2[] = {
	75	&sensor_dev_attr_temp2_input.dev_attr.attr,
	76	&sensor_dev_attr_temp2_label.dev_attr.attr,
	77	NULL
	78	};
	79
	80	static ssize_t cpu0_temp_label(struct device *dev,
	81	struct device_attribute attr, char buf)
	82	{
c01e0159	83	return sprintf(buf, "CPU 0 Temperature\n");
64f09aa9 HC	84	}
	85
	86	static ssize_t cpu1_temp_label(struct device *dev,
	87	struct device_attribute attr, char buf)
	88	{
c01e0159	89	return sprintf(buf, "CPU 1 Temperature\n");
64f09aa9 HC	90	}
	91
	92	static ssize_t get_cpu0_temp(struct device *dev,
	93	struct device_attribute attr, char buf)
	94	{
	95	int value = loongson3_cpu_temp(0);
	96	return sprintf(buf, "%d\n", value);
	97	}
	98
	99	static ssize_t get_cpu1_temp(struct device *dev,
	100	struct device_attribute attr, char buf)
	101	{
	102	int value = loongson3_cpu_temp(1);
	103	return sprintf(buf, "%d\n", value);
	104	}
	105
	106	static int create_sysfs_cputemp_files(struct kobject *kobj)
	107	{
	108	int ret;
	109
	110	ret = sysfs_create_files(kobj, hwmon_cputemp1);
	111	if (ret)
	112	goto sysfs_create_temp1_fail;
	113
	114	if (loongson_sysconf.nr_cpus <= loongson_sysconf.cores_per_package)
	115	return 0;
	116
	117	ret = sysfs_create_files(kobj, hwmon_cputemp2);
	118	if (ret)
	119	goto sysfs_create_temp2_fail;
	120
	121	return 0;
	122
	123	sysfs_create_temp2_fail:
	124	sysfs_remove_files(kobj, hwmon_cputemp1);
	125
	126	sysfs_create_temp1_fail:
	127	return -1;
	128	}
	129
	130	static void remove_sysfs_cputemp_files(struct kobject *kobj)
	131	{
	132	sysfs_remove_files(&cpu_hwmon_dev->kobj, hwmon_cputemp1);
	133
	134	if (loongson_sysconf.nr_cpus > loongson_sysconf.cores_per_package)
	135	sysfs_remove_files(&cpu_hwmon_dev->kobj, hwmon_cputemp2);
	136	}
	137
	138	#define CPU_THERMAL_THRESHOLD 90000
	139	static struct delayed_work thermal_work;
	140
	141	static void do_thermal_timer(struct work_struct *work)
	142	{
	143	int value = loongson3_cpu_temp(0);
	144	if (value <= CPU_THERMAL_THRESHOLD)
	145	schedule_delayed_work(&thermal_work, msecs_to_jiffies(5000));
	146	else
	147	orderly_poweroff(true);
	148	}
	149
	150	static int __init loongson_hwmon_init(void)
	151	{
	152	int ret;
	153
154	pr_info("Loongson Hwmon Enter...\n");
155
156	cpu_hwmon_dev = hwmon_device_register(NULL);
157	if (IS_ERR(cpu_hwmon_dev)) {
158	ret = -ENOMEM;
159	pr_err("hwmon_device_register fail!\n");
160	goto fail_hwmon_device_register;
161	}
162
163	ret = sysfs_create_group(&cpu_hwmon_dev->kobj,
164	&cpu_hwmon_attribute_group);
165	if (ret) {
166	pr_err("fail to create loongson hwmon!\n");
167	goto fail_sysfs_create_group_hwmon;
168	}
169
170	ret = create_sysfs_cputemp_files(&cpu_hwmon_dev->kobj);
171	if (ret) {
c01e0159	172	pr_err("fail to create cpu temperature interface!\n");
64f09aa9 HC	173	goto fail_create_sysfs_cputemp_files;
	174	}
	175
	176	INIT_DEFERRABLE_WORK(&thermal_work, do_thermal_timer);
	177	schedule_delayed_work(&thermal_work, msecs_to_jiffies(20000));
	178
	179	return ret;
	180
	181	fail_create_sysfs_cputemp_files:
	182	sysfs_remove_group(&cpu_hwmon_dev->kobj,
	183	&cpu_hwmon_attribute_group);
	184
	185	fail_sysfs_create_group_hwmon:
	186	hwmon_device_unregister(cpu_hwmon_dev);
	187
	188	fail_hwmon_device_register:
	189	return ret;
	190	}
	191
	192	static void __exit loongson_hwmon_exit(void)
	193	{
	194	cancel_delayed_work_sync(&thermal_work);
	195	remove_sysfs_cputemp_files(&cpu_hwmon_dev->kobj);
	196	sysfs_remove_group(&cpu_hwmon_dev->kobj,
	197	&cpu_hwmon_attribute_group);
	198	hwmon_device_unregister(cpu_hwmon_dev);
	199	}
	200
	201	module_init(loongson_hwmon_init);
	202	module_exit(loongson_hwmon_exit);
	203
	204	MODULE_AUTHOR("Yu Xiang <xiangy@lemote.com>");
	205	MODULE_AUTHOR("Huacai Chen <chenhc@lemote.com>");
	206	MODULE_DESCRIPTION("Loongson CPU Hwmon driver");
	207	MODULE_LICENSE("GPL");