[linux-2.6-block.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, prid_rev;

	reg = LOONGSON_CHIPTEMP(cpu);
	prid_rev = read_c0_prid() & PRID_REV_MASK;
	switch (prid_rev) {
	case PRID_REV_LOONGSON3A_R1:
		reg = (reg >> 8) & 0xff;
		break;
	case PRID_REV_LOONGSON3B_R1:
	case PRID_REV_LOONGSON3B_R2:
	case PRID_REV_LOONGSON3A_R2_0:
	case PRID_REV_LOONGSON3A_R2_1:
		reg = ((reg >> 8) & 0xff) - 100;
		break;
	case PRID_REV_LOONGSON3A_R3_0:
	case PRID_REV_LOONGSON3A_R3_1:
		reg = (reg & 0xffff)*731/0x4000 - 273;
		break;
	}
	return (int)reg * 1000;
}

static int nr_packages;
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_cpu_temp(struct device *dev,
			struct device_attribute *attr, char *buf);
static ssize_t cpu_temp_label(struct device *dev,
			struct device_attribute *attr, char *buf);

static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, get_cpu_temp, NULL, 1);
static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, cpu_temp_label, NULL, 1);
static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, get_cpu_temp, NULL, 2);
static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, cpu_temp_label, NULL, 2);
static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, get_cpu_temp, NULL, 3);
static SENSOR_DEVICE_ATTR(temp3_label, S_IRUGO, cpu_temp_label, NULL, 3);
static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, get_cpu_temp, NULL, 4);
static SENSOR_DEVICE_ATTR(temp4_label, S_IRUGO, cpu_temp_label, NULL, 4);

static const struct attribute *hwmon_cputemp[4][3] = {
	{
		&sensor_dev_attr_temp1_input.dev_attr.attr,
		&sensor_dev_attr_temp1_label.dev_attr.attr,
		NULL
	},
	{
		&sensor_dev_attr_temp2_input.dev_attr.attr,
		&sensor_dev_attr_temp2_label.dev_attr.attr,
		NULL
	},
	{
		&sensor_dev_attr_temp3_input.dev_attr.attr,
		&sensor_dev_attr_temp3_label.dev_attr.attr,
		NULL
	},
	{
		&sensor_dev_attr_temp4_input.dev_attr.attr,
		&sensor_dev_attr_temp4_label.dev_attr.attr,
		NULL
	}
};

static ssize_t cpu_temp_label(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	int id = (to_sensor_dev_attr(attr))->index - 1;
	return sprintf(buf, "CPU %d Temperature\n", id);
}

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

static int create_sysfs_cputemp_files(struct kobject *kobj)
{
	int i, ret = 0;

	for (i=0; i<nr_packages; i++)
		ret = sysfs_create_files(kobj, hwmon_cputemp[i]);

	return ret;
}

static void remove_sysfs_cputemp_files(struct kobject *kobj)
{
	int i;

	for (i=0; i<nr_packages; i++)
		sysfs_remove_files(kobj, hwmon_cputemp[i]);
}

#define CPU_THERMAL_THRESHOLD 90000
static struct delayed_work thermal_work;

static void do_thermal_timer(struct work_struct *work)
{
	int i, value, temp_max = 0;

	for (i=0; i<nr_packages; i++) {
		value = loongson3_cpu_temp(i);
		if (value > temp_max)
			temp_max = value;
	}

	if (temp_max <= 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;
	}

	nr_packages = loongson_sysconf.nr_cpus /
		loongson_sysconf.cores_per_package;

	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	{
0a00024d	20	u32 reg, prid_rev;
64f09aa9 HC	21
64f09aa9 HC	22	reg = LOONGSON_CHIPTEMP(cpu);
0a00024d HC	23	prid_rev = read_c0_prid() & PRID_REV_MASK;
	24	switch (prid_rev) {
	25	case PRID_REV_LOONGSON3A_R1:
64f09aa9	26	reg = (reg >> 8) & 0xff;
0a00024d	27	break;
0a00024d HC	28	case PRID_REV_LOONGSON3B_R1:
0a00024d HC	29	case PRID_REV_LOONGSON3B_R2:
f3ade253 HC	30	case PRID_REV_LOONGSON3A_R2_0:
f3ade253 HC	31	case PRID_REV_LOONGSON3A_R2_1:
64f09aa9	32	reg = ((reg >> 8) & 0xff) - 100;
0a00024d	33	break;
7cff3f16 HC	34	case PRID_REV_LOONGSON3A_R3_0:
7cff3f16 HC	35	case PRID_REV_LOONGSON3A_R3_1:
0a00024d HC	36	reg = (reg & 0xffff)*731/0x4000 - 273;
	37	break;
	38	}
64f09aa9 HC	39	return (int)reg * 1000;
	40	}
	41
99b0b5a3	42	static int nr_packages;
64f09aa9 HC	43	static struct device *cpu_hwmon_dev;
	44
	45	static ssize_t get_hwmon_name(struct device *dev,
	46	struct device_attribute attr, char buf);
	47	static SENSOR_DEVICE_ATTR(name, S_IRUGO, get_hwmon_name, NULL, 0);
	48
	49	static struct attribute *cpu_hwmon_attributes[] = {
	50	&sensor_dev_attr_name.dev_attr.attr,
	51	NULL
	52	};
	53
	54	/* Hwmon device attribute group */
	55	static struct attribute_group cpu_hwmon_attribute_group = {
	56	.attrs = cpu_hwmon_attributes,
	57	};
	58
	59	/* Hwmon device get name */
	60	static ssize_t get_hwmon_name(struct device *dev,
	61	struct device_attribute attr, char buf)
	62	{
	63	return sprintf(buf, "cpu-hwmon\n");
	64	}
	65
99b0b5a3	66	static ssize_t get_cpu_temp(struct device *dev,
64f09aa9	67	struct device_attribute attr, char buf);
99b0b5a3	68	static ssize_t cpu_temp_label(struct device *dev,
64f09aa9 HC	69	struct device_attribute attr, char buf);
64f09aa9 HC	70
99b0b5a3 HC	71	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, get_cpu_temp, NULL, 1);
	72	static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, cpu_temp_label, NULL, 1);
	73	static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, get_cpu_temp, NULL, 2);
	74	static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, cpu_temp_label, NULL, 2);
	75	static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, get_cpu_temp, NULL, 3);
	76	static SENSOR_DEVICE_ATTR(temp3_label, S_IRUGO, cpu_temp_label, NULL, 3);
	77	static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, get_cpu_temp, NULL, 4);
	78	static SENSOR_DEVICE_ATTR(temp4_label, S_IRUGO, cpu_temp_label, NULL, 4);
	79
	80	static const struct attribute *hwmon_cputemp[4][3] = {
	81	{
	82	&sensor_dev_attr_temp1_input.dev_attr.attr,
	83	&sensor_dev_attr_temp1_label.dev_attr.attr,
	84	NULL
	85	},
	86	{
	87	&sensor_dev_attr_temp2_input.dev_attr.attr,
	88	&sensor_dev_attr_temp2_label.dev_attr.attr,
	89	NULL
	90	},
	91	{
	92	&sensor_dev_attr_temp3_input.dev_attr.attr,
	93	&sensor_dev_attr_temp3_label.dev_attr.attr,
	94	NULL
	95	},
	96	{
	97	&sensor_dev_attr_temp4_input.dev_attr.attr,
	98	&sensor_dev_attr_temp4_label.dev_attr.attr,
	99	NULL
	100	}
64f09aa9 HC	101	};
64f09aa9 HC	102
99b0b5a3	103	static ssize_t cpu_temp_label(struct device *dev,
64f09aa9 HC	104	struct device_attribute attr, char buf)
64f09aa9 HC	105	{
99b0b5a3 HC	106	int id = (to_sensor_dev_attr(attr))->index - 1;
99b0b5a3 HC	107	return sprintf(buf, "CPU %d Temperature\n", id);
64f09aa9 HC	108	}
64f09aa9 HC	109
99b0b5a3	110	static ssize_t get_cpu_temp(struct device *dev,
64f09aa9 HC	111	struct device_attribute attr, char buf)
64f09aa9 HC	112	{
99b0b5a3 HC	113	int id = (to_sensor_dev_attr(attr))->index - 1;
99b0b5a3 HC	114	int value = loongson3_cpu_temp(id);
64f09aa9 HC	115	return sprintf(buf, "%d\n", value);
	116	}
	117
	118	static int create_sysfs_cputemp_files(struct kobject *kobj)
	119	{
99b0b5a3	120	int i, ret = 0;
64f09aa9	121
99b0b5a3 HC	122	for (i=0; i<nr_packages; i++)
99b0b5a3 HC	123	ret = sysfs_create_files(kobj, hwmon_cputemp[i]);
64f09aa9	124
99b0b5a3	125	return ret;
64f09aa9 HC	126	}
	127
	128	static void remove_sysfs_cputemp_files(struct kobject *kobj)
	129	{
99b0b5a3	130	int i;
64f09aa9	131
99b0b5a3 HC	132	for (i=0; i<nr_packages; i++)
99b0b5a3 HC	133	sysfs_remove_files(kobj, hwmon_cputemp[i]);
64f09aa9 HC	134	}
	135
	136	#define CPU_THERMAL_THRESHOLD 90000
	137	static struct delayed_work thermal_work;
	138
	139	static void do_thermal_timer(struct work_struct *work)
	140	{
99b0b5a3 HC	141	int i, value, temp_max = 0;
	142
	143	for (i=0; i<nr_packages; i++) {
	144	value = loongson3_cpu_temp(i);
	145	if (value > temp_max)
	146	temp_max = value;
	147	}
	148
	149	if (temp_max <= CPU_THERMAL_THRESHOLD)
64f09aa9 HC	150	schedule_delayed_work(&thermal_work, msecs_to_jiffies(5000));
	151	else
	152	orderly_poweroff(true);
	153	}
	154
	155	static int __init loongson_hwmon_init(void)
	156	{
	157	int ret;
	158
	159	pr_info("Loongson Hwmon Enter...\n");
	160
	161	cpu_hwmon_dev = hwmon_device_register(NULL);
	162	if (IS_ERR(cpu_hwmon_dev)) {
	163	ret = -ENOMEM;
	164	pr_err("hwmon_device_register fail!\n");
	165	goto fail_hwmon_device_register;
	166	}
	167
99b0b5a3 HC	168	nr_packages = loongson_sysconf.nr_cpus /
	169	loongson_sysconf.cores_per_package;
	170
64f09aa9 HC	171	ret = sysfs_create_group(&cpu_hwmon_dev->kobj,
	172	&cpu_hwmon_attribute_group);
	173	if (ret) {
	174	pr_err("fail to create loongson hwmon!\n");
	175	goto fail_sysfs_create_group_hwmon;
	176	}
	177
	178	ret = create_sysfs_cputemp_files(&cpu_hwmon_dev->kobj);
	179	if (ret) {
c01e0159	180	pr_err("fail to create cpu temperature interface!\n");
64f09aa9 HC	181	goto fail_create_sysfs_cputemp_files;
	182	}
	183
	184	INIT_DEFERRABLE_WORK(&thermal_work, do_thermal_timer);
	185	schedule_delayed_work(&thermal_work, msecs_to_jiffies(20000));
	186
	187	return ret;
	188
	189	fail_create_sysfs_cputemp_files:
	190	sysfs_remove_group(&cpu_hwmon_dev->kobj,
	191	&cpu_hwmon_attribute_group);
	192
	193	fail_sysfs_create_group_hwmon:
	194	hwmon_device_unregister(cpu_hwmon_dev);
	195
	196	fail_hwmon_device_register:
	197	return ret;
	198	}
	199
	200	static void __exit loongson_hwmon_exit(void)
	201	{
	202	cancel_delayed_work_sync(&thermal_work);
	203	remove_sysfs_cputemp_files(&cpu_hwmon_dev->kobj);
	204	sysfs_remove_group(&cpu_hwmon_dev->kobj,
	205	&cpu_hwmon_attribute_group);
	206	hwmon_device_unregister(cpu_hwmon_dev);
	207	}
	208
	209	module_init(loongson_hwmon_init);
	210	module_exit(loongson_hwmon_exit);
	211
	212	MODULE_AUTHOR("Yu Xiang <xiangy@lemote.com>");
	213	MODULE_AUTHOR("Huacai Chen <chenhc@lemote.com>");
	214	MODULE_DESCRIPTION("Loongson CPU Hwmon driver");
	215	MODULE_LICENSE("GPL");