hwmon: (w83791d) add pwm_enable support

Add support for pwm_enable.

Signed-off-by: Marc Hulsman <m.hulsman@tudelft.nl>
Acked-by: Hans de Goede <j.w.r.degoede@hhs.nl>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

2 files changed, 91 insertions, 1 deletions

diff --git a/Documentation/hwmon/w83791d b/Documentation/hwmon/w83791d
index 49c0e94a118c..b1e4798764e8 100644
--- a/Documentation/hwmon/w83791d
+++ b/Documentation/hwmon/w83791d
@@ -108,6 +108,17 @@ going forward.
 The driver reads the hardware chip values at most once every three seconds.
 User mode code requesting values more often will receive cached values.
 
+/sys files
+----------
+The sysfs-interface is documented in the 'sysfs-interface' file. Only
+chip-specific options are documented here.
+
+pwm[1-3]_enable -       this file controls mode of fan/temperature control for
+                        fan 1-3. Fan/PWM 4-5 only support manual mode.
+                            * 1 Manual mode
+                            * 2 Thermal Cruise mode   (no further support)
+                            * 3 Fan Speed Cruise mode (no further support)
+
 Alarms bitmap vs. beep_mask bitmask
 ------------------------------------
 For legacy code using the alarms and beep_mask files:
@@ -138,4 +149,4 @@ global_enable:  alarms: -------- beep_mask: 0x800000 (modified via beep_enable)
 
 W83791D TODO:
 ---------------
-Provide a patch for smart-fan control (still need appropriate motherboard/fans)
+Provide a patch for Thermal Cruise registers.
diff --git a/drivers/hwmon/w83791d.c b/drivers/hwmon/w83791d.c
index a8ff4e126713..a4d2b02d9e04 100644
--- a/drivers/hwmon/w83791d.c
+++ b/drivers/hwmon/w83791d.c
@@ -287,6 +287,8 @@ struct w83791d_data {
 
         /* PWMs */
         u8 pwm[5];              /* pwm duty cycle */
+        u8 pwm_enable[3];       /* pwm enable status for fan 1-3
+                                        (fan 4-5 only support manual mode) */
 
         /* Misc */
         u32 alarms;             /* realtime status register encoding,combined */
@@ -707,6 +709,71 @@ static struct sensor_device_attribute sda_pwm[] = {
                         show_pwm, store_pwm, 4),
 };
 
+static ssize_t show_pwmenable(struct device *dev, struct device_attribute *attr,
+                                char *buf)
+{
+        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
+        int nr = sensor_attr->index;
+        struct w83791d_data *data = w83791d_update_device(dev);
+        return sprintf(buf, "%u\n", data->pwm_enable[nr] + 1);
+}
+
+static ssize_t store_pwmenable(struct device *dev,
+                struct device_attribute *attr, const char *buf, size_t count)
+{
+        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
+        struct i2c_client *client = to_i2c_client(dev);
+        struct w83791d_data *data = i2c_get_clientdata(client);
+        int nr = sensor_attr->index;
+        unsigned long val;
+        u8 reg_cfg_tmp;
+        u8 reg_idx = 0;
+        u8 val_shift = 0;
+        u8 keep_mask = 0;
+
+        int ret = strict_strtoul(buf, 10, &val);
+
+        if (ret || val < 1 || val > 3)
+                return -EINVAL;
+
+        mutex_lock(&data->update_lock);
+        data->pwm_enable[nr] = val - 1;
+        switch (nr) {
+        case 0:
+                reg_idx = 0;
+                val_shift = 2;
+                keep_mask = 0xf3;
+                break;
+        case 1:
+                reg_idx = 0;
+                val_shift = 4;
+                keep_mask = 0xcf;
+                break;
+        case 2:
+                reg_idx = 1;
+                val_shift = 2;
+                keep_mask = 0xf3;
+                break;
+        }
+
+        reg_cfg_tmp = w83791d_read(client, W83791D_REG_FAN_CFG[reg_idx]);
+        reg_cfg_tmp = (reg_cfg_tmp & keep_mask) |
+                                        data->pwm_enable[nr] << val_shift;
+
+        w83791d_write(client, W83791D_REG_FAN_CFG[reg_idx], reg_cfg_tmp);
+        mutex_unlock(&data->update_lock);
+
+        return count;
+}
+static struct sensor_device_attribute sda_pwmenable[] = {
+        SENSOR_ATTR(pwm1_enable, S_IWUSR | S_IRUGO,
+                        show_pwmenable, store_pwmenable, 0),
+        SENSOR_ATTR(pwm2_enable, S_IWUSR | S_IRUGO,
+                        show_pwmenable, store_pwmenable, 1),
+        SENSOR_ATTR(pwm3_enable, S_IWUSR | S_IRUGO,
+                        show_pwmenable, store_pwmenable, 2),
+};
+
 /* read/write the temperature1, includes measured value and limits */
 static ssize_t show_temp1(struct device *dev, struct device_attribute *devattr,
                                 char *buf)
@@ -974,6 +1041,9 @@ static struct attribute *w83791d_attributes[] = {
         &sda_pwm[0].dev_attr.attr,
         &sda_pwm[1].dev_attr.attr,
         &sda_pwm[2].dev_attr.attr,
+        &sda_pwmenable[0].dev_attr.attr,
+        &sda_pwmenable[1].dev_attr.attr,
+        &sda_pwmenable[2].dev_attr.attr,
         NULL
 };
 
@@ -1325,6 +1395,15 @@ static struct w83791d_data *w83791d_update_device(struct device *dev)
                                                 W83791D_REG_PWM[i]);
                 }
 
+                /* Update PWM enable status */
+                for (i = 0; i < 2; i++) {
+                        reg_array_tmp[i] = w83791d_read(client,
+                                                W83791D_REG_FAN_CFG[i]);
+                }
+                data->pwm_enable[0] = (reg_array_tmp[0] >> 2) & 0x03;
+                data->pwm_enable[1] = (reg_array_tmp[0] >> 4) & 0x03;
+                data->pwm_enable[2] = (reg_array_tmp[1] >> 2) & 0x03;
+
                 /* Update the first temperature sensor */
                 for (i = 0; i < 3; i++) {
                         data->temp1[i] = w83791d_read(client,