diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/hwmon/max6650.c | 86 |
1 files changed, 85 insertions, 1 deletions
diff --git a/drivers/hwmon/max6650.c b/drivers/hwmon/max6650.c index f27af6a9da41..86142a858238 100644 --- a/drivers/hwmon/max6650.c +++ b/drivers/hwmon/max6650.c @@ -12,7 +12,7 @@ * also work with the MAX6651. It does not distinguish max6650 and max6651 * chips. * - * Tha datasheet was last seen at: + * The datasheet was last seen at: * * http://pdfserv.maxim-ic.com/en/ds/MAX6650-MAX6651.pdf * @@ -98,6 +98,16 @@ I2C_CLIENT_INSMOD_1(max6650); #define MAX6650_CFG_MODE_OPEN_LOOP 0x30 #define MAX6650_COUNT_MASK 0x03 +/* + * Alarm status register bits + */ + +#define MAX6650_ALRM_MAX 0x01 +#define MAX6650_ALRM_MIN 0x02 +#define MAX6650_ALRM_TACH 0x04 +#define MAX6650_ALRM_GPIO1 0x08 +#define MAX6650_ALRM_GPIO2 0x10 + /* Minimum and maximum values of the FAN-RPM */ #define FAN_RPM_MIN 240 #define FAN_RPM_MAX 30000 @@ -151,6 +161,7 @@ struct max6650_data u8 tach[4]; u8 count; u8 dac; + u8 alarm; }; static ssize_t get_fan(struct device *dev, struct device_attribute *devattr, @@ -418,6 +429,33 @@ static ssize_t set_div(struct device *dev, struct device_attribute *devattr, return count; } +/* + * Get alarm stati: + * Possible values: + * 0 = no alarm + * 1 = alarm + */ + +static ssize_t get_alarm(struct device *dev, struct device_attribute *devattr, + char *buf) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); + struct max6650_data *data = max6650_update_device(dev); + struct i2c_client *client = to_i2c_client(dev); + int alarm = 0; + + if (data->alarm & attr->index) { + mutex_lock(&data->update_lock); + alarm = 1; + data->alarm &= ~attr->index; + data->alarm |= i2c_smbus_read_byte_data(client, + MAX6650_REG_ALARM); + mutex_unlock(&data->update_lock); + } + + return sprintf(buf, "%d\n", alarm); +} + static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, get_fan, NULL, 0); static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, get_fan, NULL, 1); static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, get_fan, NULL, 2); @@ -426,7 +464,41 @@ static DEVICE_ATTR(fan1_target, S_IWUSR | S_IRUGO, get_target, set_target); static DEVICE_ATTR(fan1_div, S_IWUSR | S_IRUGO, get_div, set_div); static DEVICE_ATTR(pwm1_enable, S_IWUSR | S_IRUGO, get_enable, set_enable); static DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, get_pwm, set_pwm); +static SENSOR_DEVICE_ATTR(fan1_max_alarm, S_IRUGO, get_alarm, NULL, + MAX6650_ALRM_MAX); +static SENSOR_DEVICE_ATTR(fan1_min_alarm, S_IRUGO, get_alarm, NULL, + MAX6650_ALRM_MIN); +static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, get_alarm, NULL, + MAX6650_ALRM_TACH); +static SENSOR_DEVICE_ATTR(gpio1_alarm, S_IRUGO, get_alarm, NULL, + MAX6650_ALRM_GPIO1); +static SENSOR_DEVICE_ATTR(gpio2_alarm, S_IRUGO, get_alarm, NULL, + MAX6650_ALRM_GPIO2); + +static mode_t max6650_attrs_visible(struct kobject *kobj, struct attribute *a, + int n) +{ + struct device *dev = container_of(kobj, struct device, kobj); + struct i2c_client *client = to_i2c_client(dev); + u8 alarm_en = i2c_smbus_read_byte_data(client, MAX6650_REG_ALARM_EN); + struct device_attribute *devattr; + /* + * Hide the alarms that have not been enabled by the firmware + */ + + devattr = container_of(a, struct device_attribute, attr); + if (devattr == &sensor_dev_attr_fan1_max_alarm.dev_attr + || devattr == &sensor_dev_attr_fan1_min_alarm.dev_attr + || devattr == &sensor_dev_attr_fan1_fault.dev_attr + || devattr == &sensor_dev_attr_gpio1_alarm.dev_attr + || devattr == &sensor_dev_attr_gpio2_alarm.dev_attr) { + if (!(alarm_en & to_sensor_dev_attr(devattr)->index)) + return 0; + } + + return a->mode; +} static struct attribute *max6650_attrs[] = { &sensor_dev_attr_fan1_input.dev_attr.attr, @@ -437,11 +509,17 @@ static struct attribute *max6650_attrs[] = { &dev_attr_fan1_div.attr, &dev_attr_pwm1_enable.attr, &dev_attr_pwm1.attr, + &sensor_dev_attr_fan1_max_alarm.dev_attr.attr, + &sensor_dev_attr_fan1_min_alarm.dev_attr.attr, + &sensor_dev_attr_fan1_fault.dev_attr.attr, + &sensor_dev_attr_gpio1_alarm.dev_attr.attr, + &sensor_dev_attr_gpio2_alarm.dev_attr.attr, NULL }; static struct attribute_group max6650_attr_grp = { .attrs = max6650_attrs, + .is_visible = max6650_attrs_visible, }; /* @@ -659,6 +737,12 @@ static struct max6650_data *max6650_update_device(struct device *dev) MAX6650_REG_COUNT); data->dac = i2c_smbus_read_byte_data(client, MAX6650_REG_DAC); + /* Alarms are cleared on read in case the condition that + * caused the alarm is removed. Keep the value latched here + * for providing the register through different alarm files. */ + data->alarm |= i2c_smbus_read_byte_data(client, + MAX6650_REG_ALARM); + data->last_updated = jiffies; data->valid = 1; } |