hwmon: (nct7802) Add pwmX_enable attribute

Introduced REG_SMARTFAN_EN, SMARTFAN_EN_SHIFT, pwmX_enable,
show_pwm_enable, store_pwm_enable.

Signed-off-by: Constantine Shulyupin <const@MakeLinux.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

1 files changed, 48 insertions, 0 deletions

diff --git a/drivers/hwmon/nct7802.c b/drivers/hwmon/nct7802.c
index 1c80aa48ee04..f4908bb228b8 100644
--- a/drivers/hwmon/nct7802.c
+++ b/drivers/hwmon/nct7802.c
@@ -53,6 +53,8 @@ static const u8 REG_VOLTAGE_LIMIT_MSB_SHIFT[2][5] = {
 #define REG_PECI_ENABLE         0x23
 #define REG_FAN_ENABLE          0x24
 #define REG_VMON_ENABLE         0x25
+#define REG_SMARTFAN_EN(x)      (0x64 + (x) / 2)
+#define SMARTFAN_EN_SHIFT(x)    ((x) % 2 * 4)
 #define REG_VENDOR_ID           0xfd
 #define REG_CHIP_ID             0xfe
 #define REG_VERSION_ID          0xff
@@ -151,6 +153,41 @@ static ssize_t store_pwm(struct device *dev, struct device_attribute *devattr,
         return err ? : count;
 }
 
+static ssize_t show_pwm_enable(struct device *dev,
+                               struct device_attribute *attr, char *buf)
+{
+        struct nct7802_data *data = dev_get_drvdata(dev);
+        struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
+        unsigned int reg, enabled;
+        int ret;
+
+        ret = regmap_read(data->regmap, REG_SMARTFAN_EN(sattr->index), &reg);
+        if (ret < 0)
+                return ret;
+        enabled = reg >> SMARTFAN_EN_SHIFT(sattr->index) & 1;
+        return sprintf(buf, "%u\n", enabled + 1);
+}
+
+static ssize_t store_pwm_enable(struct device *dev,
+                                struct device_attribute *attr,
+                                const char *buf, size_t count)
+{
+        struct nct7802_data *data = dev_get_drvdata(dev);
+        struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
+        u8 val;
+        int ret;
+
+        ret = kstrtou8(buf, 0, &val);
+        if (ret < 0)
+                return ret;
+        if (val < 1 || val > 2)
+                return -EINVAL;
+        ret = regmap_update_bits(data->regmap, REG_SMARTFAN_EN(sattr->index),
+                                 1 << SMARTFAN_EN_SHIFT(sattr->index),
+                                 (val - 1) << SMARTFAN_EN_SHIFT(sattr->index));
+        return ret ? : count;
+}
+
 static int nct7802_read_temp(struct nct7802_data *data,
                              u8 reg_temp, u8 reg_temp_low, int *temp)
 {
@@ -793,6 +830,14 @@ static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, show_pwm, store_pwm, 0x60);
 static SENSOR_DEVICE_ATTR(pwm2, S_IRUGO | S_IWUSR, show_pwm, store_pwm, 0x61);
 static SENSOR_DEVICE_ATTR(pwm3, S_IRUGO | S_IWUSR, show_pwm, store_pwm, 0x62);
 
+/* 7.2.95... Temperature to Fan mapping Relationships Register */
+static SENSOR_DEVICE_ATTR(pwm1_enable, S_IRUGO | S_IWUSR, show_pwm_enable,
+                          store_pwm_enable, 0);
+static SENSOR_DEVICE_ATTR(pwm2_enable, S_IRUGO | S_IWUSR, show_pwm_enable,
+                          store_pwm_enable, 1);
+static SENSOR_DEVICE_ATTR(pwm3_enable, S_IRUGO | S_IWUSR, show_pwm_enable,
+                          store_pwm_enable, 2);
+
 static struct attribute *nct7802_fan_attrs[] = {
         &sensor_dev_attr_fan1_input.dev_attr.attr,
         &sensor_dev_attr_fan1_min.dev_attr.attr,
@@ -832,10 +877,13 @@ static struct attribute_group nct7802_fan_group = {
 };
 
 static struct attribute *nct7802_pwm_attrs[] = {
+        &sensor_dev_attr_pwm1_enable.dev_attr.attr,
         &sensor_dev_attr_pwm1_mode.dev_attr.attr,
         &sensor_dev_attr_pwm1.dev_attr.attr,
+        &sensor_dev_attr_pwm2_enable.dev_attr.attr,
         &sensor_dev_attr_pwm2_mode.dev_attr.attr,
         &sensor_dev_attr_pwm2.dev_attr.attr,
+        &sensor_dev_attr_pwm3_enable.dev_attr.attr,
         &sensor_dev_attr_pwm3_mode.dev_attr.attr,
         &sensor_dev_attr_pwm3.dev_attr.attr,
         NULL