[PATCH 3/3] pmbus: max31785: Add handler for set_page() and PMBUS_CLEAR_FAULTS virt pages

[Andrew Jeffery]

The max31785 uses the concept of 'virtual pages' to manage dual tach
fan inputs. These pages don't exist in hardware by definition, so don't
send spurious PAGE or CLEAR_FAULTS commands to the device for these
pages.

Signed-off-by: Andrew Jeffery <andrew at aj.id.au>
---
 drivers/hwmon/pmbus/max31785.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/hwmon/pmbus/max31785.c b/drivers/hwmon/pmbus/max31785.c
index 6a0d289ad346..a1e5f24c9744 100644
--- a/drivers/hwmon/pmbus/max31785.c
+++ b/drivers/hwmon/pmbus/max31785.c
@@ -117,11 +117,23 @@ static int max31785_read_byte_data(struct i2c_client *client, int page,
 	return -ENODATA;
 }
 
+static int max31785_set_page(struct i2c_client *client, int page)
+{
+	return (page < MAX31785_NR_PAGES) ? -ENODATA : 0;
+}
+
 static int max31785_write_byte(struct i2c_client *client, int page, u8 value)
 {
 	if (page < MAX31785_NR_PAGES)
 		return -ENODATA;
 
+	switch (value) {
+	case PMBUS_CLEAR_FAULTS:
+		return 0;
+	default:
+		break;
+	}
+
 	return -ENOTSUPP;
 }
 
@@ -604,6 +616,7 @@ static int max31785_of_tmp_config(struct i2c_client *client,
 static const struct pmbus_driver_info max31785_info = {
 	.pages = MAX31785_NR_PAGES,
 
+	.set_page = max31785_set_page,
 	.write_word_data = max31785_write_word_data,
 	.read_byte_data = max31785_read_byte_data,
 	.read_word_data = max31785_read_word_data,
-- 
2.11.0