1 files changed, 484 insertions, 310 deletions

diff --git a/drivers/hwmon/max6639.c b/drivers/hwmon/max6639.c
index aa7f21ab2395..32b4d54b2076 100644
--- a/drivers/hwmon/max6639.c
+++ b/drivers/hwmon/max6639.c
@@ -19,7 +19,8 @@
 #include <linux/hwmon-sysfs.h>
 #include <linux/err.h>
 #include <linux/mutex.h>
-#include <linux/platform_data/max6639.h>
+#include <linux/regmap.h>
+#include <linux/util_macros.h>
 
 /* Addresses to scan */
 static const unsigned short normal_i2c[] = { 0x2c, 0x2e, 0x2f, I2C_CLIENT_END };
@@ -54,11 +55,17 @@ static const unsigned short normal_i2c[] = { 0x2c, 0x2e, 0x2f, I2C_CLIENT_END };
 #define MAX6639_GCONFIG_PWM_FREQ_HI		0x08
 
 #define MAX6639_FAN_CONFIG1_PWM			0x80
-
+#define MAX6639_FAN_CONFIG3_FREQ_MASK		0x03
 #define MAX6639_FAN_CONFIG3_THERM_FULL_SPEED	0x40
 
+#define MAX6639_NUM_CHANNELS			2
+
 static const int rpm_ranges[] = { 2000, 4000, 8000, 16000 };
 
+/* Supported PWM frequency */
+static const unsigned int freq_table[] = { 20, 33, 50, 100, 5000, 8333, 12500,
+					   25000 };
+
 #define FAN_FROM_REG(val, rpm_range)	((val) == 0 || (val) == 255 ? \
 				0 : (rpm_ranges[rpm_range] * 30) / (val))
 #define TEMP_LIMIT_TO_REG(val)	clamp_val((val) / 1000, 0, 255)
@@ -67,323 +74,445 @@ static const int rpm_ranges[] = { 2000, 4000, 8000, 16000 };
  * Client data (each client gets its own)
  */
 struct max6639_data {
-	struct i2c_client *client;
+	struct regmap *regmap;
 	struct mutex update_lock;
-	bool valid;		/* true if following fields are valid */
-	unsigned long last_updated;	/* In jiffies */
-
-	/* Register values sampled regularly */
-	u16 temp[2];		/* Temperature, in 1/8 C, 0..255 C */
-	bool temp_fault[2];	/* Detected temperature diode failure */
-	u8 fan[2];		/* Register value: TACH count for fans >=30 */
-	u8 status;		/* Detected channel alarms and fan failures */
-
-	/* Register values only written to */
-	u8 pwm[2];		/* Register value: Duty cycle 0..120 */
-	u8 temp_therm[2];	/* THERM Temperature, 0..255 C (->_max) */
-	u8 temp_alert[2];	/* ALERT Temperature, 0..255 C (->_crit) */
-	u8 temp_ot[2];		/* OT Temperature, 0..255 C (->_emergency) */
 
 	/* Register values initialized only once */
-	u8 ppr;			/* Pulses per rotation 0..3 for 1..4 ppr */
-	u8 rpm_range;		/* Index in above rpm_ranges table */
+	u8 ppr[MAX6639_NUM_CHANNELS];	/* Pulses per rotation 0..3 for 1..4 ppr */
+	u8 rpm_range[MAX6639_NUM_CHANNELS]; /* Index in above rpm_ranges table */
 
 	/* Optional regulator for FAN supply */
 	struct regulator *reg;
 };
 
-static struct max6639_data *max6639_update_device(struct device *dev)
+static int max6639_temp_read_input(struct device *dev, int channel, long *temp)
 {
+	u32 regs[2] = { MAX6639_REG_TEMP_EXT(channel), MAX6639_REG_TEMP(channel) };
 	struct max6639_data *data = dev_get_drvdata(dev);
-	struct i2c_client *client = data->client;
-	struct max6639_data *ret = data;
-	int i;
-	int status_reg;
+	u8 regvals[2];
+	int res;
 
-	mutex_lock(&data->update_lock);
+	res = regmap_multi_reg_read(data->regmap, regs, regvals, 2);
+	if (res < 0)
+		return res;
 
-	if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
-		int res;
+	*temp = ((regvals[0] >> 5) | (regvals[1] << 3)) * 125;
 
-		dev_dbg(&client->dev, "Starting max6639 update\n");
+	return 0;
+}
 
-		status_reg = i2c_smbus_read_byte_data(client,
-						      MAX6639_REG_STATUS);
-		if (status_reg < 0) {
-			ret = ERR_PTR(status_reg);
-			goto abort;
-		}
+static int max6639_temp_read_fault(struct device *dev, int channel, long *fault)
+{
+	struct max6639_data *data = dev_get_drvdata(dev);
+	unsigned int val;
+	int res;
 
-		data->status = status_reg;
-
-		for (i = 0; i < 2; i++) {
-			res = i2c_smbus_read_byte_data(client,
-					MAX6639_REG_FAN_CNT(i));
-			if (res < 0) {
-				ret = ERR_PTR(res);
-				goto abort;
-			}
-			data->fan[i] = res;
-
-			res = i2c_smbus_read_byte_data(client,
-					MAX6639_REG_TEMP_EXT(i));
-			if (res < 0) {
-				ret = ERR_PTR(res);
-				goto abort;
-			}
-			data->temp[i] = res >> 5;
-			data->temp_fault[i] = res & 0x01;
-
-			res = i2c_smbus_read_byte_data(client,
-					MAX6639_REG_TEMP(i));
-			if (res < 0) {
-				ret = ERR_PTR(res);
-				goto abort;
-			}
-			data->temp[i] |= res << 3;
-		}
+	res = regmap_read(data->regmap, MAX6639_REG_TEMP_EXT(channel), &val);
+	if (res < 0)
+		return res;
 
-		data->last_updated = jiffies;
-		data->valid = true;
-	}
-abort:
-	mutex_unlock(&data->update_lock);
+	*fault = val & 1;
 
-	return ret;
+	return 0;
 }
 
-static ssize_t temp_input_show(struct device *dev,
-			       struct device_attribute *dev_attr, char *buf)
+static int max6639_temp_read_max(struct device *dev, int channel, long *max)
 {
-	long temp;
-	struct max6639_data *data = max6639_update_device(dev);
-	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
+	struct max6639_data *data = dev_get_drvdata(dev);
+	unsigned int val;
+	int res;
+
+	res = regmap_read(data->regmap, MAX6639_REG_THERM_LIMIT(channel), &val);
+	if (res < 0)
+		return res;
 
-	if (IS_ERR(data))
-		return PTR_ERR(data);
+	*max = (long)val * 1000;
 
-	temp = data->temp[attr->index] * 125;
-	return sprintf(buf, "%ld\n", temp);
+	return 0;
 }
 
-static ssize_t temp_fault_show(struct device *dev,
-			       struct device_attribute *dev_attr, char *buf)
+static int max6639_temp_read_crit(struct device *dev, int channel, long *crit)
 {
-	struct max6639_data *data = max6639_update_device(dev);
-	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
+	struct max6639_data *data = dev_get_drvdata(dev);
+	unsigned int val;
+	int res;
+
+	res = regmap_read(data->regmap, MAX6639_REG_ALERT_LIMIT(channel), &val);
+	if (res < 0)
+		return res;
 
-	if (IS_ERR(data))
-		return PTR_ERR(data);
+	*crit = (long)val * 1000;
 
-	return sprintf(buf, "%d\n", data->temp_fault[attr->index]);
+	return 0;
 }
 
-static ssize_t temp_max_show(struct device *dev,
-			     struct device_attribute *dev_attr, char *buf)
+static int max6639_temp_read_emergency(struct device *dev, int channel, long *emerg)
 {
-	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
 	struct max6639_data *data = dev_get_drvdata(dev);
+	unsigned int val;
+	int res;
 
-	return sprintf(buf, "%d\n", (data->temp_therm[attr->index] * 1000));
+	res = regmap_read(data->regmap, MAX6639_REG_OT_LIMIT(channel), &val);
+	if (res < 0)
+		return res;
+
+	*emerg = (long)val * 1000;
+
+	return 0;
 }
 
-static ssize_t temp_max_store(struct device *dev,
-			      struct device_attribute *dev_attr,
-			      const char *buf, size_t count)
+static int max6639_get_status(struct device *dev, unsigned int *status)
 {
-	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
 	struct max6639_data *data = dev_get_drvdata(dev);
-	struct i2c_client *client = data->client;
-	unsigned long val;
+	unsigned int val;
 	int res;
 
-	res = kstrtoul(buf, 10, &val);
-	if (res)
+	res = regmap_read(data->regmap, MAX6639_REG_STATUS, &val);
+	if (res < 0)
 		return res;
 
-	mutex_lock(&data->update_lock);
-	data->temp_therm[attr->index] = TEMP_LIMIT_TO_REG(val);
-	i2c_smbus_write_byte_data(client,
-				  MAX6639_REG_THERM_LIMIT(attr->index),
-				  data->temp_therm[attr->index]);
-	mutex_unlock(&data->update_lock);
-	return count;
+	*status = val;
+
+	return 0;
 }
 
-static ssize_t temp_crit_show(struct device *dev,
-			      struct device_attribute *dev_attr, char *buf)
+static int max6639_temp_set_max(struct max6639_data *data, int channel, long val)
 {
-	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
-	struct max6639_data *data = dev_get_drvdata(dev);
+	int res;
 
-	return sprintf(buf, "%d\n", (data->temp_alert[attr->index] * 1000));
+	res = regmap_write(data->regmap, MAX6639_REG_THERM_LIMIT(channel),
+			   TEMP_LIMIT_TO_REG(val));
+	return res;
 }
 
-static ssize_t temp_crit_store(struct device *dev,
-			       struct device_attribute *dev_attr,
-			       const char *buf, size_t count)
+static int max6639_temp_set_crit(struct max6639_data *data, int channel, long val)
 {
-	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
-	struct max6639_data *data = dev_get_drvdata(dev);
-	struct i2c_client *client = data->client;
-	unsigned long val;
 	int res;
 
-	res = kstrtoul(buf, 10, &val);
-	if (res)
-		return res;
+	res = regmap_write(data->regmap, MAX6639_REG_ALERT_LIMIT(channel), TEMP_LIMIT_TO_REG(val));
 
-	mutex_lock(&data->update_lock);
-	data->temp_alert[attr->index] = TEMP_LIMIT_TO_REG(val);
-	i2c_smbus_write_byte_data(client,
-				  MAX6639_REG_ALERT_LIMIT(attr->index),
-				  data->temp_alert[attr->index]);
-	mutex_unlock(&data->update_lock);
-	return count;
+	return res;
 }
 
-static ssize_t temp_emergency_show(struct device *dev,
-				   struct device_attribute *dev_attr,
-				   char *buf)
+static int max6639_temp_set_emergency(struct max6639_data *data, int channel, long val)
 {
-	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
-	struct max6639_data *data = dev_get_drvdata(dev);
+	int res;
 
-	return sprintf(buf, "%d\n", (data->temp_ot[attr->index] * 1000));
+	res = regmap_write(data->regmap, MAX6639_REG_OT_LIMIT(channel), TEMP_LIMIT_TO_REG(val));
+
+	return res;
 }
 
-static ssize_t temp_emergency_store(struct device *dev,
-				    struct device_attribute *dev_attr,
-				    const char *buf, size_t count)
+static int max6639_read_fan(struct device *dev, u32 attr, int channel,
+			    long *fan_val)
 {
-	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
 	struct max6639_data *data = dev_get_drvdata(dev);
-	struct i2c_client *client = data->client;
-	unsigned long val;
+	unsigned int val;
 	int res;
 
-	res = kstrtoul(buf, 10, &val);
-	if (res)
-		return res;
+	switch (attr) {
+	case hwmon_fan_input:
+		res = regmap_read(data->regmap, MAX6639_REG_FAN_CNT(channel), &val);
+		if (res < 0)
+			return res;
+		*fan_val = FAN_FROM_REG(val, data->rpm_range[channel]);
+		return 0;
+	case hwmon_fan_fault:
+		res = max6639_get_status(dev, &val);
+		if (res < 0)
+			return res;
+		*fan_val = !!(val & BIT(1 - channel));
+		return 0;
+	case hwmon_fan_pulses:
+		*fan_val = data->ppr[channel];
+		return 0;
+	default:
+		return -EOPNOTSUPP;
+	}
+}
 
-	mutex_lock(&data->update_lock);
-	data->temp_ot[attr->index] = TEMP_LIMIT_TO_REG(val);
-	i2c_smbus_write_byte_data(client,
-				  MAX6639_REG_OT_LIMIT(attr->index),
-				  data->temp_ot[attr->index]);
-	mutex_unlock(&data->update_lock);
-	return count;
+static int max6639_set_ppr(struct max6639_data *data, int channel, u8 ppr)
+{
+	/* Decrement the PPR value and shift left by 6 to match the register format */
+	return regmap_write(data->regmap, MAX6639_REG_FAN_PPR(channel), ppr-- << 6);
 }
 
-static ssize_t pwm_show(struct device *dev, struct device_attribute *dev_attr,
-			char *buf)
+static int max6639_write_fan(struct device *dev, u32 attr, int channel,
+			     long val)
 {
-	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
 	struct max6639_data *data = dev_get_drvdata(dev);
+	int err;
+
+	switch (attr) {
+	case hwmon_fan_pulses:
+		if (val <= 0 || val > 4)
+			return -EINVAL;
 
-	return sprintf(buf, "%d\n", data->pwm[attr->index] * 255 / 120);
+		mutex_lock(&data->update_lock);
+		/* Set Fan pulse per revolution */
+		err = max6639_set_ppr(data, channel, val);
+		if (err < 0) {
+			mutex_unlock(&data->update_lock);
+			return err;
+		}
+		data->ppr[channel] = val;
+
+		mutex_unlock(&data->update_lock);
+		return 0;
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static umode_t max6639_fan_is_visible(const void *_data, u32 attr, int channel)
+{
+	switch (attr) {
+	case hwmon_fan_input:
+	case hwmon_fan_fault:
+		return 0444;
+	case hwmon_fan_pulses:
+		return 0644;
+	default:
+		return 0;
+	}
 }
 
-static ssize_t pwm_store(struct device *dev,
-			 struct device_attribute *dev_attr, const char *buf,
-			 size_t count)
+static int max6639_read_pwm(struct device *dev, u32 attr, int channel,
+			    long *pwm_val)
 {
-	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
+	u32 regs[2] = { MAX6639_REG_FAN_CONFIG3(channel), MAX6639_REG_GCONFIG };
 	struct max6639_data *data = dev_get_drvdata(dev);
-	struct i2c_client *client = data->client;
-	unsigned long val;
+	unsigned int val;
+	u8 regvals[2];
 	int res;
+	u8 i;
+
+	switch (attr) {
+	case hwmon_pwm_input:
+		res = regmap_read(data->regmap, MAX6639_REG_TARGTDUTY(channel), &val);
+		if (res < 0)
+			return res;
+		*pwm_val = val * 255 / 120;
+		return 0;
+	case hwmon_pwm_freq:
+		res = regmap_multi_reg_read(data->regmap, regs, regvals, 2);
+		if (res < 0)
+			return res;
+		i = regvals[0] & MAX6639_FAN_CONFIG3_FREQ_MASK;
+		if (regvals[1] & MAX6639_GCONFIG_PWM_FREQ_HI)
+			i |= 0x4;
+		*pwm_val = freq_table[i];
+		return 0;
+	default:
+		return -EOPNOTSUPP;
+	}
+}
 
-	res = kstrtoul(buf, 10, &val);
-	if (res)
-		return res;
+static int max6639_write_pwm(struct device *dev, u32 attr, int channel,
+			     long val)
+{
+	struct max6639_data *data = dev_get_drvdata(dev);
+	int err;
+	u8 i;
+
+	switch (attr) {
+	case hwmon_pwm_input:
+		if (val < 0 || val > 255)
+			return -EINVAL;
+		err = regmap_write(data->regmap, MAX6639_REG_TARGTDUTY(channel),
+				   val * 120 / 255);
+		return err;
+	case hwmon_pwm_freq:
+		val = clamp_val(val, 0, 25000);
+
+		i = find_closest(val, freq_table, ARRAY_SIZE(freq_table));
+
+		mutex_lock(&data->update_lock);
+		err = regmap_update_bits(data->regmap, MAX6639_REG_FAN_CONFIG3(channel),
+					 MAX6639_FAN_CONFIG3_FREQ_MASK, i);
+		if (err < 0) {
+			mutex_unlock(&data->update_lock);
+			return err;
+		}
 
-	val = clamp_val(val, 0, 255);
+		if (i >> 2)
+			err = regmap_set_bits(data->regmap, MAX6639_REG_GCONFIG,
+					      MAX6639_GCONFIG_PWM_FREQ_HI);
+		else
+			err = regmap_clear_bits(data->regmap, MAX6639_REG_GCONFIG,
+						MAX6639_GCONFIG_PWM_FREQ_HI);
 
-	mutex_lock(&data->update_lock);
-	data->pwm[attr->index] = (u8)(val * 120 / 255);
-	i2c_smbus_write_byte_data(client,
-				  MAX6639_REG_TARGTDUTY(attr->index),
-				  data->pwm[attr->index]);
-	mutex_unlock(&data->update_lock);
-	return count;
+		mutex_unlock(&data->update_lock);
+		return err;
+	default:
+		return -EOPNOTSUPP;
+	}
 }
 
-static ssize_t fan_input_show(struct device *dev,
-			      struct device_attribute *dev_attr, char *buf)
+static umode_t max6639_pwm_is_visible(const void *_data, u32 attr, int channel)
 {
-	struct max6639_data *data = max6639_update_device(dev);
-	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
+	switch (attr) {
+	case hwmon_pwm_input:
+	case hwmon_pwm_freq:
+		return 0644;
+	default:
+		return 0;
+	}
+}
 
-	if (IS_ERR(data))
-		return PTR_ERR(data);
+static int max6639_read_temp(struct device *dev, u32 attr, int channel,
+			     long *val)
+{
+	unsigned int status;
+	int res;
 
-	return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[attr->index],
-		       data->rpm_range));
+	switch (attr) {
+	case hwmon_temp_input:
+		res = max6639_temp_read_input(dev, channel, val);
+		return res;
+	case hwmon_temp_fault:
+		res = max6639_temp_read_fault(dev, channel, val);
+		return res;
+	case hwmon_temp_max:
+		res = max6639_temp_read_max(dev, channel, val);
+		return res;
+	case hwmon_temp_crit:
+		res = max6639_temp_read_crit(dev, channel, val);
+		return res;
+	case hwmon_temp_emergency:
+		res = max6639_temp_read_emergency(dev, channel, val);
+		return res;
+	case hwmon_temp_max_alarm:
+		res = max6639_get_status(dev, &status);
+		if (res < 0)
+			return res;
+		*val = !!(status & BIT(3 - channel));
+		return 0;
+	case hwmon_temp_crit_alarm:
+		res = max6639_get_status(dev, &status);
+		if (res < 0)
+			return res;
+		*val = !!(status & BIT(7 - channel));
+		return 0;
+	case hwmon_temp_emergency_alarm:
+		res = max6639_get_status(dev, &status);
+		if (res < 0)
+			return res;
+		*val = !!(status & BIT(5 - channel));
+		return 0;
+	default:
+		return -EOPNOTSUPP;
+	}
 }
 
-static ssize_t alarm_show(struct device *dev,
-			  struct device_attribute *dev_attr, char *buf)
+static int max6639_write_temp(struct device *dev, u32 attr, int channel,
+			      long val)
 {
-	struct max6639_data *data = max6639_update_device(dev);
-	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
+	struct max6639_data *data = dev_get_drvdata(dev);
 
-	if (IS_ERR(data))
-		return PTR_ERR(data);
+	switch (attr) {
+	case hwmon_temp_max:
+		return max6639_temp_set_max(data, channel, val);
+	case hwmon_temp_crit:
+		return max6639_temp_set_crit(data, channel, val);
+	case hwmon_temp_emergency:
+		return max6639_temp_set_emergency(data, channel, val);
+	default:
+		return -EOPNOTSUPP;
+	}
+}
 
-	return sprintf(buf, "%d\n", !!(data->status & (1 << attr->index)));
+static umode_t max6639_temp_is_visible(const void *_data, u32 attr, int channel)
+{
+	switch (attr) {
+	case hwmon_temp_input:
+	case hwmon_temp_fault:
+	case hwmon_temp_max_alarm:
+	case hwmon_temp_crit_alarm:
+	case hwmon_temp_emergency_alarm:
+		return 0444;
+	case hwmon_temp_max:
+	case hwmon_temp_crit:
+	case hwmon_temp_emergency:
+		return 0644;
+	default:
+		return 0;
+	}
+}
+
+static int max6639_read(struct device *dev, enum hwmon_sensor_types type,
+			u32 attr, int channel, long *val)
+{
+	switch (type) {
+	case hwmon_fan:
+		return max6639_read_fan(dev, attr, channel, val);
+	case hwmon_pwm:
+		return max6639_read_pwm(dev, attr, channel, val);
+	case hwmon_temp:
+		return max6639_read_temp(dev, attr, channel, val);
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static int max6639_write(struct device *dev, enum hwmon_sensor_types type,
+			 u32 attr, int channel, long val)
+{
+	switch (type) {
+	case hwmon_fan:
+		return max6639_write_fan(dev, attr, channel, val);
+	case hwmon_pwm:
+		return max6639_write_pwm(dev, attr, channel, val);
+	case hwmon_temp:
+		return max6639_write_temp(dev, attr, channel, val);
+	default:
+		return -EOPNOTSUPP;
+	}
 }
 
-static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0);
-static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_input, 1);
-static SENSOR_DEVICE_ATTR_RO(temp1_fault, temp_fault, 0);
-static SENSOR_DEVICE_ATTR_RO(temp2_fault, temp_fault, 1);
-static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_max, 0);
-static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_max, 1);
-static SENSOR_DEVICE_ATTR_RW(temp1_crit, temp_crit, 0);
-static SENSOR_DEVICE_ATTR_RW(temp2_crit, temp_crit, 1);
-static SENSOR_DEVICE_ATTR_RW(temp1_emergency, temp_emergency, 0);
-static SENSOR_DEVICE_ATTR_RW(temp2_emergency, temp_emergency, 1);
-static SENSOR_DEVICE_ATTR_RW(pwm1, pwm, 0);
-static SENSOR_DEVICE_ATTR_RW(pwm2, pwm, 1);
-static SENSOR_DEVICE_ATTR_RO(fan1_input, fan_input, 0);
-static SENSOR_DEVICE_ATTR_RO(fan2_input, fan_input, 1);
-static SENSOR_DEVICE_ATTR_RO(fan1_fault, alarm, 1);
-static SENSOR_DEVICE_ATTR_RO(fan2_fault, alarm, 0);
-static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 3);
-static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 2);
-static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 7);
-static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, 6);
-static SENSOR_DEVICE_ATTR_RO(temp1_emergency_alarm, alarm, 5);
-static SENSOR_DEVICE_ATTR_RO(temp2_emergency_alarm, alarm, 4);
-
-
-static struct attribute *max6639_attrs[] = {
-	&sensor_dev_attr_temp1_input.dev_attr.attr,
-	&sensor_dev_attr_temp2_input.dev_attr.attr,
-	&sensor_dev_attr_temp1_fault.dev_attr.attr,
-	&sensor_dev_attr_temp2_fault.dev_attr.attr,
-	&sensor_dev_attr_temp1_max.dev_attr.attr,
-	&sensor_dev_attr_temp2_max.dev_attr.attr,
-	&sensor_dev_attr_temp1_crit.dev_attr.attr,
-	&sensor_dev_attr_temp2_crit.dev_attr.attr,
-	&sensor_dev_attr_temp1_emergency.dev_attr.attr,
-	&sensor_dev_attr_temp2_emergency.dev_attr.attr,
-	&sensor_dev_attr_pwm1.dev_attr.attr,
-	&sensor_dev_attr_pwm2.dev_attr.attr,
-	&sensor_dev_attr_fan1_input.dev_attr.attr,
-	&sensor_dev_attr_fan2_input.dev_attr.attr,
-	&sensor_dev_attr_fan1_fault.dev_attr.attr,
-	&sensor_dev_attr_fan2_fault.dev_attr.attr,
-	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
-	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
-	&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
-	&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
-	&sensor_dev_attr_temp1_emergency_alarm.dev_attr.attr,
-	&sensor_dev_attr_temp2_emergency_alarm.dev_attr.attr,
+static umode_t max6639_is_visible(const void *data,
+				  enum hwmon_sensor_types type,
+				  u32 attr, int channel)
+{
+	switch (type) {
+	case hwmon_fan:
+		return max6639_fan_is_visible(data, attr, channel);
+	case hwmon_pwm:
+		return max6639_pwm_is_visible(data, attr, channel);
+	case hwmon_temp:
+		return max6639_temp_is_visible(data, attr, channel);
+	default:
+		return 0;
+	}
+}
+
+static const struct hwmon_channel_info * const max6639_info[] = {
+	HWMON_CHANNEL_INFO(fan,
+			   HWMON_F_INPUT | HWMON_F_FAULT | HWMON_F_PULSES,
+			   HWMON_F_INPUT | HWMON_F_FAULT | HWMON_F_PULSES),
+	HWMON_CHANNEL_INFO(pwm,
+			   HWMON_PWM_INPUT | HWMON_PWM_FREQ,
+			   HWMON_PWM_INPUT | HWMON_PWM_FREQ),
+	HWMON_CHANNEL_INFO(temp,
+			   HWMON_T_INPUT | HWMON_T_FAULT | HWMON_T_MAX | HWMON_T_MAX_ALARM |
+			   HWMON_T_CRIT | HWMON_T_CRIT_ALARM | HWMON_T_EMERGENCY |
+			   HWMON_T_EMERGENCY_ALARM,
+			   HWMON_T_INPUT | HWMON_T_FAULT | HWMON_T_MAX | HWMON_T_MAX_ALARM |
+			   HWMON_T_CRIT | HWMON_T_CRIT_ALARM | HWMON_T_EMERGENCY |
+			   HWMON_T_EMERGENCY_ALARM),
 	NULL
 };
-ATTRIBUTE_GROUPS(max6639);
+
+static const struct hwmon_ops max6639_hwmon_ops = {
+	.is_visible = max6639_is_visible,
+	.read = max6639_read,
+	.write = max6639_write,
+};
+
+static const struct hwmon_chip_info max6639_chip_info = {
+	.ops = &max6639_hwmon_ops,
+	.info = max6639_info,
+};
 
 /*
  *  returns respective index in rpm_ranges table
@@ -401,101 +530,125 @@ static int rpm_range_to_reg(int range)
 	return 1; /* default: 4000 RPM */
 }
 
+static int max6639_probe_child_from_dt(struct i2c_client *client,
+				       struct device_node *child,
+				       struct max6639_data *data)
+
+{
+	struct device *dev = &client->dev;
+	u32 i;
+	int err, val;
+
+	err = of_property_read_u32(child, "reg", &i);
+	if (err) {
+		dev_err(dev, "missing reg property of %pOFn\n", child);
+		return err;
+	}
+
+	if (i > 1) {
+		dev_err(dev, "Invalid fan index reg %d\n", i);
+		return -EINVAL;
+	}
+
+	err = of_property_read_u32(child, "pulses-per-revolution", &val);
+	if (!err) {
+		if (val < 1 || val > 5) {
+			dev_err(dev, "invalid pulses-per-revolution %d of %pOFn\n", val, child);
+			return -EINVAL;
+		}
+		data->ppr[i] = val;
+	}
+
+	err = of_property_read_u32(child, "max-rpm", &val);
+	if (!err)
+		data->rpm_range[i] = rpm_range_to_reg(val);
+
+	return 0;
+}
+
 static int max6639_init_client(struct i2c_client *client,
 			       struct max6639_data *data)
 {
-	struct max6639_platform_data *max6639_info =
-		dev_get_platdata(&client->dev);
-	int i;
-	int rpm_range = 1; /* default: 4000 RPM */
-	int err;
+	struct device *dev = &client->dev;
+	const struct device_node *np = dev->of_node;
+	struct device_node *child;
+	int i, err;
 
 	/* Reset chip to default values, see below for GCONFIG setup */
-	err = i2c_smbus_write_byte_data(client, MAX6639_REG_GCONFIG,
-				  MAX6639_GCONFIG_POR);
+	err = regmap_write(data->regmap, MAX6639_REG_GCONFIG, MAX6639_GCONFIG_POR);
 	if (err)
-		goto exit;
+		return err;
 
 	/* Fans pulse per revolution is 2 by default */
-	if (max6639_info && max6639_info->ppr > 0 &&
-			max6639_info->ppr < 5)
-		data->ppr = max6639_info->ppr;
-	else
-		data->ppr = 2;
-	data->ppr -= 1;
+	data->ppr[0] = 2;
+	data->ppr[1] = 2;
 
-	if (max6639_info)
-		rpm_range = rpm_range_to_reg(max6639_info->rpm_range);
-	data->rpm_range = rpm_range;
+	/* default: 4000 RPM */
+	data->rpm_range[0] = 1;
+	data->rpm_range[1] = 1;
 
-	for (i = 0; i < 2; i++) {
+	for_each_child_of_node(np, child) {
+		if (strcmp(child->name, "fan"))
+			continue;
+
+		err = max6639_probe_child_from_dt(client, child, data);
+		if (err) {
+			of_node_put(child);
+			return err;
+		}
+	}
+
+	for (i = 0; i < MAX6639_NUM_CHANNELS; i++) {
+		err = regmap_set_bits(data->regmap, MAX6639_REG_OUTPUT_MASK, BIT(1 - i));
+		if (err)
+			return err;
 
 		/* Set Fan pulse per revolution */
-		err = i2c_smbus_write_byte_data(client,
-				MAX6639_REG_FAN_PPR(i),
-				data->ppr << 6);
+		err = max6639_set_ppr(data, i, data->ppr[i]);
 		if (err)
-			goto exit;
+			return err;
 
 		/* Fans config PWM, RPM */
-		err = i2c_smbus_write_byte_data(client,
-			MAX6639_REG_FAN_CONFIG1(i),
-			MAX6639_FAN_CONFIG1_PWM | rpm_range);
+		err = regmap_write(data->regmap, MAX6639_REG_FAN_CONFIG1(i),
+				   MAX6639_FAN_CONFIG1_PWM | data->rpm_range[i]);
 		if (err)
-			goto exit;
+			return err;
 
 		/* Fans PWM polarity high by default */
-		if (max6639_info && max6639_info->pwm_polarity == 0)
-			err = i2c_smbus_write_byte_data(client,
-				MAX6639_REG_FAN_CONFIG2a(i), 0x00);
-		else
-			err = i2c_smbus_write_byte_data(client,
-				MAX6639_REG_FAN_CONFIG2a(i), 0x02);
+		err = regmap_write(data->regmap, MAX6639_REG_FAN_CONFIG2a(i), 0x00);
 		if (err)
-			goto exit;
+			return err;
 
 		/*
 		 * /THERM full speed enable,
 		 * PWM frequency 25kHz, see also GCONFIG below
 		 */
-		err = i2c_smbus_write_byte_data(client,
-			MAX6639_REG_FAN_CONFIG3(i),
-			MAX6639_FAN_CONFIG3_THERM_FULL_SPEED | 0x03);
+		err = regmap_write(data->regmap, MAX6639_REG_FAN_CONFIG3(i),
+				   MAX6639_FAN_CONFIG3_THERM_FULL_SPEED | 0x03);
 		if (err)
-			goto exit;
+			return err;
 
 		/* Max. temp. 80C/90C/100C */
-		data->temp_therm[i] = 80;
-		data->temp_alert[i] = 90;
-		data->temp_ot[i] = 100;
-		err = i2c_smbus_write_byte_data(client,
-				MAX6639_REG_THERM_LIMIT(i),
-				data->temp_therm[i]);
+		err = regmap_write(data->regmap, MAX6639_REG_THERM_LIMIT(i), 80);
 		if (err)
-			goto exit;
-		err = i2c_smbus_write_byte_data(client,
-				MAX6639_REG_ALERT_LIMIT(i),
-				data->temp_alert[i]);
+			return err;
+		err = regmap_write(data->regmap, MAX6639_REG_ALERT_LIMIT(i), 90);
 		if (err)
-			goto exit;
-		err = i2c_smbus_write_byte_data(client,
-				MAX6639_REG_OT_LIMIT(i), data->temp_ot[i]);
+			return err;
+		err = regmap_write(data->regmap, MAX6639_REG_OT_LIMIT(i), 100);
 		if (err)
-			goto exit;
+			return err;
 
 		/* PWM 120/120 (i.e. 100%) */
-		data->pwm[i] = 120;
-		err = i2c_smbus_write_byte_data(client,
-				MAX6639_REG_TARGTDUTY(i), data->pwm[i]);
+		err = regmap_write(data->regmap, MAX6639_REG_TARGTDUTY(i), 120);
 		if (err)
-			goto exit;
+			return err;
 	}
 	/* Start monitoring */
-	err = i2c_smbus_write_byte_data(client, MAX6639_REG_GCONFIG,
-		MAX6639_GCONFIG_DISABLE_TIMEOUT | MAX6639_GCONFIG_CH2_LOCAL |
-		MAX6639_GCONFIG_PWM_FREQ_HI);
-exit:
-	return err;
+	return regmap_write(data->regmap, MAX6639_REG_GCONFIG,
+			    MAX6639_GCONFIG_DISABLE_TIMEOUT | MAX6639_GCONFIG_CH2_LOCAL |
+			    MAX6639_GCONFIG_PWM_FREQ_HI);
+
 }
 
 /* Return 0 if detection is successful, -ENODEV otherwise */
@@ -524,6 +677,32 @@ static void max6639_regulator_disable(void *data)
 	regulator_disable(data);
 }
 
+static bool max6639_regmap_is_volatile(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case MAX6639_REG_TEMP(0):
+	case MAX6639_REG_TEMP_EXT(0):
+	case MAX6639_REG_TEMP(1):
+	case MAX6639_REG_TEMP_EXT(1):
+	case MAX6639_REG_STATUS:
+	case MAX6639_REG_FAN_CNT(0):
+	case MAX6639_REG_FAN_CNT(1):
+	case MAX6639_REG_TARGTDUTY(0):
+	case MAX6639_REG_TARGTDUTY(1):
+		return true;
+	default:
+		return false;
+	}
+}
+
+static const struct regmap_config max6639_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = MAX6639_REG_DEVREV,
+	.cache_type = REGCACHE_MAPLE,
+	.volatile_reg = max6639_regmap_is_volatile,
+};
+
 static int max6639_probe(struct i2c_client *client)
 {
 	struct device *dev = &client->dev;
@@ -535,7 +714,11 @@ static int max6639_probe(struct i2c_client *client)
 	if (!data)
 		return -ENOMEM;
 
-	data->client = client;
+	data->regmap = devm_regmap_init_i2c(client, &max6639_regmap_config);
+	if (IS_ERR(data->regmap))
+		return dev_err_probe(dev,
+				     PTR_ERR(data->regmap),
+				     "regmap initialization failed\n");
 
 	data->reg = devm_regulator_get_optional(dev, "fan");
 	if (IS_ERR(data->reg)) {
@@ -565,31 +748,26 @@ static int max6639_probe(struct i2c_client *client)
 	if (err < 0)
 		return err;
 
-	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
-							   data,
-							   max6639_groups);
+	hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
+							 data, &max6639_chip_info,
+							 NULL);
+
 	return PTR_ERR_OR_ZERO(hwmon_dev);
 }
 
 static int max6639_suspend(struct device *dev)
 {
-	struct i2c_client *client = to_i2c_client(dev);
 	struct max6639_data *data = dev_get_drvdata(dev);
-	int ret = i2c_smbus_read_byte_data(client, MAX6639_REG_GCONFIG);
-
-	if (ret < 0)
-		return ret;
 
 	if (data->reg)
 		regulator_disable(data->reg);
 
-	return i2c_smbus_write_byte_data(client,
-			MAX6639_REG_GCONFIG, ret | MAX6639_GCONFIG_STANDBY);
+	return regmap_write_bits(data->regmap, MAX6639_REG_GCONFIG, MAX6639_GCONFIG_STANDBY,
+				 MAX6639_GCONFIG_STANDBY);
 }
 
 static int max6639_resume(struct device *dev)
 {
-	struct i2c_client *client = to_i2c_client(dev);
 	struct max6639_data *data = dev_get_drvdata(dev);
 	int ret;
 
@@ -601,16 +779,12 @@ static int max6639_resume(struct device *dev)
 		}
 	}
 
-	ret = i2c_smbus_read_byte_data(client, MAX6639_REG_GCONFIG);
-	if (ret < 0)
-		return ret;
-
-	return i2c_smbus_write_byte_data(client,
-			MAX6639_REG_GCONFIG, ret & ~MAX6639_GCONFIG_STANDBY);
+	return regmap_write_bits(data->regmap, MAX6639_REG_GCONFIG, MAX6639_GCONFIG_STANDBY,
+				 ~MAX6639_GCONFIG_STANDBY);
 }
 
 static const struct i2c_device_id max6639_id[] = {
-	{"max6639", 0},
+	{"max6639"},
 	{ }
 };