From: Wu Zhangjin <wuzhangjin@xxxxxxxxx>
This patch adds hwmon driver for managing the temperature of battery,
cpu and controlling the fan.
Signed-off-by: Wu Zhangjin <wuzhangjin@xxxxxxxxx>
---
.../loongson/lemote-2f/yeeloong_laptop/Kconfig | 9 +
.../loongson/lemote-2f/yeeloong_laptop/Makefile | 1 +
.../lemote-2f/yeeloong_laptop/ec_kb3310b.h | 3 +
.../loongson/lemote-2f/yeeloong_laptop/hwmon.c | 241 ++++++++++++++++++++
4 files changed, 254 insertions(+), 0 deletions(-)
create mode 100644 arch/mips/loongson/lemote-2f/yeeloong_laptop/hwmon.c
diff --git a/arch/mips/loongson/lemote-2f/yeeloong_laptop/Kconfig b/arch/mips/loongson/lemote-2f/yeeloong_laptop/Kconfig
index e284c91..56cb584 100644
--- a/arch/mips/loongson/lemote-2f/yeeloong_laptop/Kconfig
+++ b/arch/mips/loongson/lemote-2f/yeeloong_laptop/Kconfig
@@ -28,4 +28,13 @@ config YEELOONG_BATTERY
This option adds APM emulated Battery Driver, which provides standard
interface for user-space applications to manage the battery.
+config YEELOONG_HWMON
+ tristate "Hardware Monitor Driver"
+ select HWMON
+ default y
+ help
+ This option adds hardware monitor driver, which provides standard
+ interface for lm-sensors to monitor the temperatures of CPU and
+ battery, the PWM of fan, the current, voltage of battery.
+
endif
diff --git a/arch/mips/loongson/lemote-2f/yeeloong_laptop/Makefile b/arch/mips/loongson/lemote-2f/yeeloong_laptop/Makefile
index 20fe0c6..73277a8 100644
--- a/arch/mips/loongson/lemote-2f/yeeloong_laptop/Makefile
+++ b/arch/mips/loongson/lemote-2f/yeeloong_laptop/Makefile
@@ -4,3 +4,4 @@ obj-y += ec_kb3310b.o
obj-$(CONFIG_YEELOONG_BACKLIGHT) += backlight.o
obj-$(CONFIG_YEELOONG_BATTERY) += battery.o
+obj-$(CONFIG_YEELOONG_HWMON) += hwmon.o
diff --git a/arch/mips/loongson/lemote-2f/yeeloong_laptop/ec_kb3310b.h b/arch/mips/loongson/lemote-2f/yeeloong_laptop/ec_kb3310b.h
index 0e3b5ad..674a543 100644
--- a/arch/mips/loongson/lemote-2f/yeeloong_laptop/ec_kb3310b.h
+++ b/arch/mips/loongson/lemote-2f/yeeloong_laptop/ec_kb3310b.h
@@ -22,6 +22,9 @@ extern int ec_get_event_num(void);
typedef int (*sci_handler) (int status);
extern sci_handler yeeloong_report_lid_status;
+extern void set_fan_pwm(int value);
+extern void set_fan_pwm_enable(int manual);
+
#define SCI_IRQ_NUM 0x0A
#define MAX_BRIGHTNESS 8
diff --git a/arch/mips/loongson/lemote-2f/yeeloong_laptop/hwmon.c b/arch/mips/loongson/lemote-2f/yeeloong_laptop/hwmon.c
new file mode 100644
index 0000000..22c5f1d
--- /dev/null
+++ b/arch/mips/loongson/lemote-2f/yeeloong_laptop/hwmon.c
@@ -0,0 +1,241 @@
+/*
+ * YeeLoong Hwmon Driver
+ *
+ * Copyright (C) 2009 Lemote Inc.
+ * Author: Wu Zhangjin <wuzj@xxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/err.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+
+#include <asm/bootinfo.h>
+
+#include "ec_kb3310b.h"
+
+MODULE_AUTHOR("Wu Zhangjin <wuzj@xxxxxxxxxx>");
+MODULE_DESCRIPTION("YeeLoong laptop hwmon driver");
+MODULE_LICENSE("GPL");
+
+/* pwm(auto/manual) enable or not */
+static int get_fan_pwm_enable(void)
+{
+ return ec_read(REG_FAN_AUTO_MAN_SWITCH);
+}
+
+void set_fan_pwm_enable(int manual)
+{
+ ec_write(REG_FAN_AUTO_MAN_SWITCH, !!manual);
+}
+EXPORT_SYMBOL(set_fan_pwm_enable);
+
+static int get_fan_pwm(void)
+{
+ return ec_read(REG_FAN_SPEED_LEVEL);
+}
+
+void set_fan_pwm(int value)
+{
+ int status;
+
+ value = SENSORS_LIMIT(value, 0, 3);
+
+ /* If value is not ZERO, We should ensure it is on */
+ if (value != 0) {
+ status = ec_read(REG_FAN_STATUS);
+ if (status == 0)
+ ec_write(REG_FAN_CONTROL, BIT_FAN_CONTROL_ON);
+ }
+ ec_write(REG_FAN_SPEED_LEVEL, value);
+}
+EXPORT_SYMBOL(set_fan_pwm);
+
+static int get_fan_rpm(void)
+{
+ int value = 0;
+
+ value = FAN_SPEED_DIVIDER /
+ (((ec_read(REG_FAN_SPEED_HIGH) & 0x0f) << 8) |
+ ec_read(REG_FAN_SPEED_LOW));
+
+ return value;
+}
+
+static int get_cpu_temp(void)
+{
+ int value;
+
+ value = ec_read(REG_TEMPERATURE_VALUE);
+
+ if (value & (1 << 7))
+ value = (value & 0x7f) - 128;
+ else
+ value = value & 0xff;
+
+ return value * 1000;
+}
+
+static int get_battery_temp(void)
+{
+ int value;
+
+ value = (ec_read(REG_BAT_TEMPERATURE_HIGH) << 8) |
+ (ec_read(REG_BAT_TEMPERATURE_LOW));
+
+ return value * 1000;
+}
+
+static int get_battery_temp_alarm(void)
+{
+ int status;
+
+ status = (ec_read(REG_BAT_CHARGE_STATUS) &
+ BIT_BAT_CHARGE_STATUS_OVERTEMP);
+
+ return !!status;
+}
+
+static int get_battery_current(void)
+{
+ int value;
+
+ value = (ec_read(REG_BAT_CURRENT_HIGH) << 8) |
+ (ec_read(REG_BAT_CURRENT_LOW));
+
+ if (value & 0x8000)
+ value = 0xffff - value;
+
+ return value;
+}
+
+static int get_battery_voltage(void)
+{
+ int value;
+
+ value = (ec_read(REG_BAT_VOLTAGE_HIGH) << 8) |
+ (ec_read(REG_BAT_VOLTAGE_LOW));
+
+ return value;
+}
+
+
+static int parse_arg(const char *buf, unsigned long count, int *val)
+{
+ if (!count)
+ return 0;
+ if (sscanf(buf, "%i", val) != 1)
+ return -EINVAL;
+ return count;
+}
+
+static ssize_t store_sys_hwmon(void (*set) (int), const char *buf, size_t count)
+{
+ int rv, value;
+
+ rv = parse_arg(buf, count, &value);
+ if (rv > 0)
+ set(value);
+ return rv;
+}
+
+static ssize_t show_sys_hwmon(int (*get) (void), char *buf)
+{
+ return sprintf(buf, "%d\n", get());
+}
+
+#define CREATE_SENSOR_ATTR(_name, _mode, _set, _get) \
+ static ssize_t show_##_name(struct device *dev, \
+ struct device_attribute *attr, \
+ char *buf) \
+ { \
+ return show_sys_hwmon(_set, buf); \
+ } \
+ static ssize_t store_##_name(struct device *dev, \
+ struct device_attribute *attr, \
+ const char *buf, size_t count) \
+ { \
+ return store_sys_hwmon(_get, buf, count); \
+ } \
+ static SENSOR_DEVICE_ATTR(_name, _mode, show_##_name, store_##_name, 0);
+
+CREATE_SENSOR_ATTR(fan1_input, S_IRUGO, get_fan_rpm, NULL);
+CREATE_SENSOR_ATTR(pwm1, S_IRUGO | S_IWUSR, get_fan_pwm, set_fan_pwm);
+CREATE_SENSOR_ATTR(pwm1_enable, S_IRUGO | S_IWUSR, get_fan_pwm_enable,
+ set_fan_pwm_enable);
+CREATE_SENSOR_ATTR(temp1_input, S_IRUGO, get_cpu_temp, NULL);
+CREATE_SENSOR_ATTR(temp2_input, S_IRUGO, get_battery_temp, NULL);
+CREATE_SENSOR_ATTR(temp2_max_alarm, S_IRUGO, get_battery_temp_alarm, NULL);
+CREATE_SENSOR_ATTR(curr1_input, S_IRUGO, get_battery_current, NULL);
+CREATE_SENSOR_ATTR(in1_input, S_IRUGO, get_battery_voltage, NULL);
+
+static ssize_t
+show_name(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ return sprintf(buf, "yeeloong\n");
+}
+
+static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0);
+
+static struct attribute *hwmon_attributes[] = {
+ &sensor_dev_attr_pwm1.dev_attr.attr,
+ &sensor_dev_attr_pwm1_enable.dev_attr.attr,
+ &sensor_dev_attr_fan1_input.dev_attr.attr,
+ &sensor_dev_attr_temp1_input.dev_attr.attr,
+ &sensor_dev_attr_temp2_input.dev_attr.attr,
+ &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
+ &sensor_dev_attr_curr1_input.dev_attr.attr,
+ &sensor_dev_attr_in1_input.dev_attr.attr,
+ &sensor_dev_attr_name.dev_attr.attr,
+ NULL
+};
+
+static struct attribute_group hwmon_attribute_group = {
+ .attrs = hwmon_attributes
+};
+
+struct device *yeeloong_hwmon_dev;
+
+static int __init yeeloong_hwmon_init(void)
+{
+ int ret;
+
+ if (mips_machtype != MACH_LEMOTE_YL2F89) {
+ pr_err("This Driver is only for YeeLoong laptop\n");
+ return -EFAULT;
+ }
+
+ yeeloong_hwmon_dev = hwmon_device_register(NULL);
+ if (IS_ERR(yeeloong_hwmon_dev)) {
+ pr_err("Fail to register yeeloong hwmon device\n");
+ yeeloong_hwmon_dev = NULL;
+ return PTR_ERR(yeeloong_hwmon_dev);
+ }
+ ret = sysfs_create_group(&yeeloong_hwmon_dev->kobj,
+ &hwmon_attribute_group);
+ if (ret) {
+ sysfs_remove_group(&yeeloong_hwmon_dev->kobj,
+ &hwmon_attribute_group);
+ hwmon_device_unregister(yeeloong_hwmon_dev);
+ yeeloong_hwmon_dev = NULL;
+ }
+ /* ensure fan is set to auto mode */
+ set_fan_pwm_enable(BIT_FAN_AUTO);
+
+ return 0;
+}
+
+static void __exit yeeloong_hwmon_exit(void)
+{
+ if (yeeloong_hwmon_dev) {
+ sysfs_remove_group(&yeeloong_hwmon_dev->kobj,
+ &hwmon_attribute_group);
+ hwmon_device_unregister(yeeloong_hwmon_dev);
+ yeeloong_hwmon_dev = NULL;
+ }
+}
+
+module_init(yeeloong_hwmon_init);
+module_exit(yeeloong_hwmon_exit);
--
1.6.2.1
