lkml.org 
[lkml]   [2009]   [Dec]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    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


    \
     
     \ /
      Last update: 2009-12-04 14:39    [W:0.034 / U:122.464 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site