[4/6] hwmon: (max1619) Convert to with_info API

Commit Message

Guenter Roeck July 27, 2024, 2:38 p.m. UTC

Convert driver to with_info hwmon API to simplify the code and
with it its maintainability.

Signed-off-by: Guenter Roeck <[e-mail]>
---
 drivers/hwmon/max1619.c | 269 +++++++++++++++++++++++-----------------
 1 file changed, 157 insertions(+), 112 deletions(-)

Comments

Tzung-Bi Shih July 28, 2024, 4:26 a.m. UTC | #1

On Sat, Jul 27, 2024 at 07:38:18AM -0700, Guenter Roeck wrote:
> Convert driver to with_info hwmon API to simplify the code and
> with it its maintainability.
> 
> Signed-off-by: Guenter Roeck <[e-mail]>

Reviewed-by: Tzung-Bi Shih <[e-mail]>

Patch

diff --git a/drivers/hwmon/max1619.c b/drivers/hwmon/max1619.c
index ae0ea4156f24..966fe650aa59 100644
--- a/drivers/hwmon/max1619.c
+++ b/drivers/hwmon/max1619.c
@@ -14,20 +14,14 @@ 
 
 #include <linux/err.h>
 #include <linux/hwmon.h>
-#include <linux/hwmon-sysfs.h>
 #include <linux/i2c.h>
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/regmap.h>
-#include <linux/sysfs.h>
 
 static const unsigned short normal_i2c[] = {
 	0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
 
-/*
- * The MAX1619 registers
- */
-
 #define MAX1619_REG_LOCAL_TEMP		0x00
 #define MAX1619_REG_REMOTE_TEMP		0x01
 #define MAX1619_REG_STATUS		0x02
@@ -40,66 +34,6 @@  static const unsigned short normal_i2c[] = {
 #define MAX1619_REG_MAN_ID		0xFE
 #define MAX1619_REG_CHIP_ID		0xFF
 
-enum temp_index {
-	t_input1 = 0,
-	t_input2,
-	t_low2,
-	t_high2,
-	t_crit2,
-	t_hyst2,
-	t_num_regs
-};
-
-/*
- * Client data (each client gets its own)
- */
-
-static const u8 regs[t_num_regs] = {
-	[t_input1] = MAX1619_REG_LOCAL_TEMP,
-	[t_input2] = MAX1619_REG_REMOTE_TEMP,
-	[t_low2] = MAX1619_REG_REMOTE_LOW,
-	[t_high2] = MAX1619_REG_REMOTE_HIGH,
-	[t_crit2] = MAX1619_REG_REMOTE_CRIT,
-	[t_hyst2] = MAX1619_REG_REMOTE_CRIT_HYST,
-};
-
-/*
- * Sysfs stuff
- */
-
-static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
-			 char *buf)
-{
-	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
-	struct regmap *regmap = dev_get_drvdata(dev);
-	u32 temp;
-	int ret;
-
-	ret = regmap_read(regmap, regs[attr->index], &temp);
-	if (ret < 0)
-		return ret;
-
-	return sprintf(buf, "%d\n", sign_extend32(temp, 7) * 1000);
-}
-
-static ssize_t temp_store(struct device *dev,
-			  struct device_attribute *devattr, const char *buf,
-			  size_t count)
-{
-	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
-	struct regmap *regmap = dev_get_drvdata(dev);
-	long val;
-	int err = kstrtol(buf, 10, &val);
-	if (err)
-		return err;
-
-	val = DIV_ROUND_CLOSEST(clamp_val(val, -128000, 127000), 1000);
-	err = regmap_write(regmap, regs[attr->index], val);
-	if (err < 0)
-		return err;
-	return count;
-}
-
 static int get_alarms(struct regmap *regmap)
 {
 	static u32 regs[2] = { MAX1619_REG_STATUS, MAX1619_REG_CONFIG };
@@ -117,62 +51,175 @@  static int get_alarms(struct regmap *regmap)
 	return regdata[0] & 0x1e;
 }
 
-static ssize_t alarms_show(struct device *dev, struct device_attribute *attr,
-			   char *buf)
+static int max1619_temp_read(struct regmap *regmap, u32 attr, int channel, long *val)
 {
-	struct regmap *regmap = dev_get_drvdata(dev);
-	int alarms;
+	int reg = -1, alarm_bit = 0;
+	u32 temp;
+	int ret;
 
-	alarms = get_alarms(regmap);
-	if (alarms < 0)
-		return alarms;
-
-	return sprintf(buf, "%d\n", alarms);
+	switch (attr) {
+	case hwmon_temp_input:
+		reg = channel ? MAX1619_REG_REMOTE_TEMP : MAX1619_REG_LOCAL_TEMP;
+		break;
+	case hwmon_temp_min:
+		reg = MAX1619_REG_REMOTE_LOW;
+		break;
+	case hwmon_temp_max:
+		reg = MAX1619_REG_REMOTE_HIGH;
+		break;
+	case hwmon_temp_crit:
+		reg = MAX1619_REG_REMOTE_CRIT;
+		break;
+	case hwmon_temp_crit_hyst:
+		reg = MAX1619_REG_REMOTE_CRIT_HYST;
+		break;
+	case hwmon_temp_min_alarm:
+		alarm_bit = 3;
+		break;
+	case hwmon_temp_max_alarm:
+		alarm_bit = 4;
+		break;
+	case hwmon_temp_crit_alarm:
+		alarm_bit = 1;
+		break;
+	case hwmon_temp_fault:
+		alarm_bit = 2;
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+	if (reg >= 0) {
+		ret = regmap_read(regmap, reg, &temp);
+		if (ret < 0)
+			return ret;
+		*val = sign_extend32(temp, 7) * 1000;
+	} else {
+		ret = get_alarms(regmap);
+		if (ret < 0)
+			return ret;
+		*val = !!(ret & BIT(alarm_bit));
+	}
+	return 0;
 }
 
-static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
-			  char *buf)
+static int max1619_chip_read(struct regmap *regmap, u32 attr, long *val)
 {
-	int bitnr = to_sensor_dev_attr(attr)->index;
-	struct regmap *regmap = dev_get_drvdata(dev);
 	int alarms;
 
-	alarms = get_alarms(regmap);
-	if (alarms < 0)
-		return alarms;
-
-	return sprintf(buf, "%d\n", (alarms >> bitnr) & 1);
+	switch (attr) {
+	case hwmon_chip_alarms:
+		alarms = get_alarms(regmap);
+		if (alarms < 0)
+			return alarms;
+		*val = alarms;
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+	return 0;
 }
 
-static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, t_input1);
-static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, t_input2);
-static SENSOR_DEVICE_ATTR_RW(temp2_min, temp, t_low2);
-static SENSOR_DEVICE_ATTR_RW(temp2_max, temp, t_high2);
-static SENSOR_DEVICE_ATTR_RW(temp2_crit, temp, t_crit2);
-static SENSOR_DEVICE_ATTR_RW(temp2_crit_hyst, temp, t_hyst2);
+static int max1619_read(struct device *dev, enum hwmon_sensor_types type,
+			u32 attr, int channel, long *val)
+{
+	struct regmap *regmap = dev_get_drvdata(dev);
 
-static DEVICE_ATTR_RO(alarms);
-static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, 1);
-static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 2);
-static SENSOR_DEVICE_ATTR_RO(temp2_min_alarm, alarm, 3);
-static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 4);
+	switch (type) {
+	case hwmon_chip:
+		return max1619_chip_read(regmap, attr, val);
+	case hwmon_temp:
+		return max1619_temp_read(regmap, attr, channel, val);
+	default:
+		return -EOPNOTSUPP;
+	}
+}
 
-static struct attribute *max1619_attrs[] = {
-	&sensor_dev_attr_temp1_input.dev_attr.attr,
-	&sensor_dev_attr_temp2_input.dev_attr.attr,
-	&sensor_dev_attr_temp2_min.dev_attr.attr,
-	&sensor_dev_attr_temp2_max.dev_attr.attr,
-	&sensor_dev_attr_temp2_crit.dev_attr.attr,
-	&sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
+static int max1619_write(struct device *dev, enum hwmon_sensor_types type,
+			 u32 attr, int channel, long val)
+{
+	struct regmap *regmap = dev_get_drvdata(dev);
+	int reg;
 
-	&dev_attr_alarms.attr,
-	&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
-	&sensor_dev_attr_temp2_fault.dev_attr.attr,
-	&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
-	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
+	if (type != hwmon_temp)
+		return -EOPNOTSUPP;
+
+	switch (attr) {
+	case hwmon_temp_min:
+		reg = MAX1619_REG_REMOTE_LOW;
+		break;
+	case hwmon_temp_max:
+		reg = MAX1619_REG_REMOTE_HIGH;
+		break;
+	case hwmon_temp_crit:
+		reg = MAX1619_REG_REMOTE_CRIT;
+		break;
+	case hwmon_temp_crit_hyst:
+		reg = MAX1619_REG_REMOTE_CRIT_HYST;
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+	val = DIV_ROUND_CLOSEST(clamp_val(val, -128000, 127000), 1000);
+	return regmap_write(regmap, reg, val);
+}
+
+static umode_t max1619_is_visible(const void *_data, enum hwmon_sensor_types type,
+				  u32 attr, int channel)
+{
+	switch (type) {
+	case hwmon_chip:
+		switch (attr) {
+		case hwmon_chip_alarms:
+			return 0444;
+		default:
+			break;
+		}
+		break;
+	case hwmon_temp:
+		switch (attr) {
+		case hwmon_temp_input:
+			return 0444;
+		case hwmon_temp_min:
+		case hwmon_temp_max:
+		case hwmon_temp_crit:
+		case hwmon_temp_crit_hyst:
+			return 0644;
+		case hwmon_temp_min_alarm:
+		case hwmon_temp_max_alarm:
+		case hwmon_temp_crit_alarm:
+		case hwmon_temp_fault:
+			return 0444;
+		default:
+			break;
+		}
+		break;
+	default:
+		break;
+	}
+	return 0;
+}
+
+static const struct hwmon_channel_info * const max1619_info[] = {
+	HWMON_CHANNEL_INFO(chip, HWMON_C_ALARMS),
+	HWMON_CHANNEL_INFO(temp,
+			   HWMON_T_INPUT,
+			   HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |
+			   HWMON_T_CRIT | HWMON_T_CRIT_HYST |
+			   HWMON_T_MIN_ALARM | HWMON_T_MAX_ALARM |
+			   HWMON_T_CRIT_ALARM | HWMON_T_FAULT),
 	NULL
 };
-ATTRIBUTE_GROUPS(max1619);
+
+static const struct hwmon_ops max1619_hwmon_ops = {
+	.is_visible = max1619_is_visible,
+	.read = max1619_read,
+	.write = max1619_write,
+};
+
+static const struct hwmon_chip_info max1619_chip_info = {
+	.ops = &max1619_hwmon_ops,
+	.info = max1619_info,
+};
 
 /* Return 0 if detection is successful, -ENODEV otherwise */
 static int max1619_detect(struct i2c_client *client,
@@ -266,10 +313,8 @@  static int max1619_probe(struct i2c_client *client)
 	if (IS_ERR(regmap))
 		return PTR_ERR(regmap);
 
-	hwmon_dev = devm_hwmon_device_register_with_groups(dev,
-							   client->name,
-							   regmap,
-							   max1619_groups);
+	hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
+							 regmap, &max1619_chip_info, NULL);
 	return PTR_ERR_OR_ZERO(hwmon_dev);
 }