From: Wu Zhangjin <wuzhangjin@xxxxxxxxx>
Changes from v11 5/8:
o add a get_bat_info() macro to cleanup the battery related
operation.
Changes from v10 5/8:
o ensure the whole fan related source code follow the hwmon
interfaces.
Changes from v9 5/8:
o ensure the fan controlling interface is compatible with the
one described in Documentation/hwmon/sysfs-interface
----------------
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.
Please refer to Documentation/hwmon/userspace-tools and
Documentation/hwmon/sysfs-interface to get more information about the
hwmon.
Acked-by: Pavel Machek <pavel@xxxxxx>
Signed-off-by: Wu Zhangjin <wuzhangjin@xxxxxxxxx>
---
drivers/platform/mips/Kconfig | 1 +
drivers/platform/mips/yeeloong_laptop.c | 253 ++++++++++++++++++++++++++++++-
2 files changed, 250 insertions(+), 4 deletions(-)
diff --git a/drivers/platform/mips/Kconfig b/drivers/platform/mips/Kconfig
index c1ba03d..d4ce744 100644
--- a/drivers/platform/mips/Kconfig
+++ b/drivers/platform/mips/Kconfig
@@ -18,6 +18,7 @@ config LEMOTE_YEELOONG2F
tristate "Lemote YeeLoong Laptop"
depends on LEMOTE_MACH2F
select BACKLIGHT_CLASS_DEVICE
+ select HWMON
help
YeeLoong netbook is a mini laptop made by Lemote, which is basically
compatible to FuLoong2F mini PC, but it has an extra Embedded
diff --git a/drivers/platform/mips/yeeloong_laptop.c b/drivers/platform/mips/yeeloong_laptop.c
index 31fbb49..7182580 100644
--- a/drivers/platform/mips/yeeloong_laptop.c
+++ b/drivers/platform/mips/yeeloong_laptop.c
@@ -12,6 +12,8 @@
#include <linux/platform_device.h>
#include <linux/backlight.h> /* for backlight subdriver */
#include <linux/fb.h>
+#include <linux/hwmon.h> /* for hwmon subdriver */
+#include <linux/hwmon-sysfs.h>
#include <ec_kb3310b.h>
@@ -27,10 +29,7 @@ static int yeeloong_set_brightness(struct backlight_device *bd)
bd->props.power == FB_BLANK_UNBLANK) ?
bd->props.brightness : 0;
- if (level > MAX_BRIGHTNESS)
- level = MAX_BRIGHTNESS;
- else if (level < 0)
- level = 0;
+ level = SENSORS_LIMIT(level, 0, MAX_BRIGHTNESS);
/* Avoid to modify the brightness when EC is tuning it */
if (old_level != level) {
@@ -84,6 +83,244 @@ static void yeeloong_backlight_exit(void)
}
}
+/* hwmon subdriver */
+
+#define MIN_FAN_SPEED 0
+#define MAX_FAN_SPEED 3
+
+static int get_fan_pwm_enable(void)
+{
+ int level, mode;
+
+ level = ec_read(REG_FAN_SPEED_LEVEL);
+ mode = ec_read(REG_FAN_AUTO_MAN_SWITCH);
+
+ if (level == MAX_FAN_SPEED && mode == BIT_FAN_MANUAL)
+ mode = 0;
+ else if (mode == BIT_FAN_MANUAL)
+ mode = 1;
+ else
+ mode = 2;
+
+ return mode;
+}
+
+static void set_fan_pwm_enable(int mode)
+{
+ switch (mode) {
+ case 0:
+ /* fullspeed */
+ ec_write(REG_FAN_AUTO_MAN_SWITCH, BIT_FAN_MANUAL);
+ ec_write(REG_FAN_SPEED_LEVEL, MAX_FAN_SPEED);
+ break;
+ case 1:
+ ec_write(REG_FAN_AUTO_MAN_SWITCH, BIT_FAN_MANUAL);
+ break;
+ case 2:
+ ec_write(REG_FAN_AUTO_MAN_SWITCH, BIT_FAN_AUTO);
+ break;
+ default:
+ break;
+ }
+}
+
+static int get_fan_pwm(void)
+{
+ return ec_read(REG_FAN_SPEED_LEVEL);
+}
+
+static void set_fan_pwm(int value)
+{
+ int mode;
+
+ mode = ec_read(REG_FAN_AUTO_MAN_SWITCH);
+ if (mode != BIT_FAN_MANUAL)
+ return;
+
+ value = SENSORS_LIMIT(value, 0, 3);
+
+ /* We must ensure the fan is on */
+ if (value > 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)
+{
+ s8 value;
+
+ value = ec_read(REG_TEMPERATURE_VALUE);
+
+ return value * 1000;
+}
+
+static int get_cpu_temp_max(void)
+{
+ return 60 * 1000;
+}
+
+#define get_bat_info(type) \
+ ((ec_read(REG_BAT_##type##_HIGH) << 8) | \
+ (ec_read(REG_BAT_##type##_LOW)))
+
+static int get_battery_temp(void)
+{
+ int value;
+
+ value = get_bat_info(TEMPERATURE);
+
+ 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)
+{
+ s16 value;
+
+ value = get_bat_info(CURRENT);
+
+ return -value;
+}
+
+static int get_battery_voltage(void)
+{
+ int value;
+
+ value = get_bat_info(VOLTAGE);
+
+ return value;
+}
+
+static ssize_t store_sys_hwmon(void (*set) (int), const char *buf, size_t count)
+{
+ int ret;
+ unsigned long value;
+
+ if (!count)
+ return 0;
+
+ ret = strict_strtoul(buf, 10, &value);
+ if (ret)
+ return ret;
+
+ set(value);
+
+ return count;
+}
+
+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(temp1_max, S_IRUGO, get_cpu_temp_max, 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_temp1_max.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(2);
+
+ 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",
@@ -121,11 +358,19 @@ static int __init yeeloong_init(void)
return ret;
}
+ 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_backlight_exit();
platform_driver_unregister(&platform_driver);
--
1.6.6
