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Subject[PATCH v7 5/8] Loongson: YeeLoong: add hardware monitoring driver
Date
From: Wu Zhangjin <wuzhangjin@gmail.com>

This patch adds hardware monitoring driver, it provides standard
interface(/sys/class/hwmon/) for lm-sensors/sensors-applet to monitor
the temperatures of CPU and battery, the PWM of fan, the current,
voltage of battery.

Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
---
drivers/platform/mips/Kconfig | 1 +
drivers/platform/mips/yeeloong_laptop.c | 221 +++++++++++++++++++++++++++++++
2 files changed, 222 insertions(+), 0 deletions(-)
diff --git a/drivers/platform/mips/Kconfig b/drivers/platform/mips/Kconfig
index 0c6b5ad..9c8385c 100644
--- a/drivers/platform/mips/Kconfig
+++ b/drivers/platform/mips/Kconfig
@@ -20,6 +20,7 @@ config LEMOTE_YEELOONG2F
select BACKLIGHT_CLASS_DEVICE
select SYS_SUPPORTS_APM_EMULATION
select APM_EMULATION
+ select HWMON
default m
help
YeeLoong netbook is a mini laptop made by Lemote, which is basically
diff --git a/drivers/platform/mips/yeeloong_laptop.c b/drivers/platform/mips/yeeloong_laptop.c
index 729e368..644aaa7 100644
--- a/drivers/platform/mips/yeeloong_laptop.c
+++ b/drivers/platform/mips/yeeloong_laptop.c
@@ -14,6 +14,8 @@
#include <linux/backlight.h> /* for backlight subdriver */
#include <linux/fb.h>
#include <linux/apm-emulation.h>/* for battery subdriver */
+#include <linux/hwmon.h> /* for hwmon subdriver */
+#include <linux/hwmon-sysfs.h>

#include <ec_kb3310b.h>

@@ -184,6 +186,217 @@ static void yeeloong_battery_exit(void)
apm_get_power_status = NULL;
}

+/* hwmon subdriver */
+
+/* pwm(auto/manual) enable or not */
+static int get_fan_pwm_enable(void)
+{
+ return ec_read(REG_FAN_AUTO_MAN_SWITCH);
+}
+
+static void set_fan_pwm_enable(int manual)
+{
+ ec_write(REG_FAN_AUTO_MAN_SWITCH, !!manual);
+}
+
+static int get_fan_pwm(void)
+{
+ return ec_read(REG_FAN_SPEED_LEVEL);
+}
+
+static 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);
+}
+
+static int get_fan_rpm(void)
+{
+ int value;
+
+ 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
+};
+
+static struct device *yeeloong_hwmon_dev;
+
+static int yeeloong_hwmon_init(void)
+{
+ int ret;
+
+ 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) {
+ hwmon_device_unregister(yeeloong_hwmon_dev);
+ yeeloong_hwmon_dev = NULL;
+ return ret;
+ }
+ /* ensure fan is set to auto mode */
+ set_fan_pwm_enable(BIT_FAN_AUTO);
+
+ return 0;
+}
+
+static void 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;
+ }
+}
+
static struct platform_device_id platform_device_ids[] = {
{
.name = "yeeloong_laptop",
@@ -223,11 +436,19 @@ static int __init yeeloong_init(void)

yeeloong_battery_init();

+ ret = yeeloong_hwmon_init();
+ if (ret) {
+ pr_err("Fail to register yeeloong hwmon driver.\n");
+ yeeloong_hwmon_exit();
+ return ret;
+ }
+
return 0;
}

static void __exit yeeloong_exit(void)
{
+ yeeloong_hwmon_exit();
yeeloong_battery_exit();
yeeloong_backlight_exit();
platform_driver_unregister(&platform_driver);
--
1.6.2.1


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