[PATCH linux dev-4.10 v2 2/5] drivers/hwmon/pmbus: p17531: Add non-hwmon attributes

[Eddie James]

From: "Edward A. James" <eajames at us.ibm.com>

Add sysfs entries to dump out PS registers and clear faults.

Signed-off-by: Edward A. James <eajames at us.ibm.com>
---
 drivers/hwmon/pmbus/p17531.c | 80 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 80 insertions(+)

diff --git a/drivers/hwmon/pmbus/p17531.c b/drivers/hwmon/pmbus/p17531.c
index 2190f8c..4b2d7e1 100644
--- a/drivers/hwmon/pmbus/p17531.c
+++ b/drivers/hwmon/pmbus/p17531.c
@@ -9,8 +9,10 @@
 
 #include <linux/device.h>
 #include <linux/i2c.h>
+#include <linux/hwmon-sysfs.h>
 #include <linux/jiffies.h>
 #include <linux/module.h>
+#include <linux/sysfs.h>
 
 #include "pmbus.h"
 
@@ -123,14 +125,92 @@ static int p17531_read_word_data(struct i2c_client *client, int page, int reg)
 	.read_word_data = p17531_read_word_data,
 };
 
+static ssize_t p17531_clear_faults(struct device *dev,
+				   struct device_attribute *dev_attr,
+				   const char *buf, size_t count)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+
+	pmbus_clear_faults(client);
+
+	return count;
+}
+static DEVICE_ATTR(clear_faults, 0200, NULL, p17531_clear_faults);
+
+static ssize_t p17531_show_status_word(struct device *dev,
+				       struct device_attribute *dev_attr,
+				       char *buf)
+{
+	int rc;
+	struct i2c_client *client = to_i2c_client(dev);
+
+	rc = pmbus_read_word_data(client, 0, PMBUS_STATUS_WORD);
+	if (rc < 0)
+		return rc;
+
+	return snprintf(buf, PAGE_SIZE - 1, "%04x\n", rc);
+}
+static DEVICE_ATTR(status_word, 0444, p17531_show_status_word, NULL);
+
+static ssize_t p17531_show_status_byte(struct device *dev,
+				       struct device_attribute *dev_attr,
+				       char *buf)
+{
+	int rc;
+	struct i2c_client *client = to_i2c_client(dev);
+	struct sensor_device_attribute *sattr = to_sensor_dev_attr(dev_attr);
+
+	rc = pmbus_read_byte_data(client, 0, PMBUS_STATUS_VOUT + sattr->index);
+	if (rc < 0)
+		return rc;
+
+	return snprintf(buf, PAGE_SIZE - 1, "%02x\n", rc);
+}
+
+static SENSOR_DEVICE_ATTR(status_vout, 0444, p17531_show_status_byte, NULL, 0);
+static SENSOR_DEVICE_ATTR(status_iout, 0444, p17531_show_status_byte, NULL, 1);
+static SENSOR_DEVICE_ATTR(status_input, 0444, p17531_show_status_byte, NULL,
+			  2);
+static SENSOR_DEVICE_ATTR(status_temp, 0444, p17531_show_status_byte, NULL, 3);
+static SENSOR_DEVICE_ATTR(status_cml, 0444, p17531_show_status_byte, NULL, 4);
+static SENSOR_DEVICE_ATTR(status_other, 0444, p17531_show_status_byte, NULL,
+			  5);
+static SENSOR_DEVICE_ATTR(status_mfr, 0444, p17531_show_status_byte, NULL, 6);
+static SENSOR_DEVICE_ATTR(status_fan, 0444, p17531_show_status_byte, NULL, 7);
+
+static struct attribute *p17531_attributes[] = {
+	&dev_attr_clear_faults.attr,
+	&dev_attr_status_word.attr,
+	&sensor_dev_attr_status_vout.dev_attr.attr,
+	&sensor_dev_attr_status_iout.dev_attr.attr,
+	&sensor_dev_attr_status_input.dev_attr.attr,
+	&sensor_dev_attr_status_temp.dev_attr.attr,
+	&sensor_dev_attr_status_cml.dev_attr.attr,
+	&sensor_dev_attr_status_other.dev_attr.attr,
+	&sensor_dev_attr_status_mfr.dev_attr.attr,
+	&sensor_dev_attr_status_fan.dev_attr.attr,
+	NULL
+};
+
+static const struct attribute_group p17531_attribute_group = {
+	.attrs = p17531_attributes,
+};
+
 static int p17531_probe(struct i2c_client *client,
 			const struct i2c_device_id *id)
 {
+	int rc = sysfs_create_group(&client->dev.kobj,
+				    &p17531_attribute_group);
+	if (rc)
+		return rc;
+
 	return pmbus_do_probe(client, id, &p17531_info);
 }
 
 static int p17531_remove(struct i2c_client *client)
 {
+	sysfs_remove_group(&client->dev.kobj, &p17531_attribute_group);
+
 	return pmbus_do_remove(client);
 }
 
-- 
1.8.3.1