hwmon: (pmbus/lm25066) Ignore byte writes to non-zero pages

pmbus_clear_faults() attempts to clear faults on non-existing real pages.
As a result, the command error bit in the status register is set, and faults
are not really cleared.

All byte writes to non-zero pages are requests to clear the status register
on that page. Since non-zero pages are virtual and do not exist on the chip,
there is nothing to do, and such requests have to be ignored. This fixes
above problem.

Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Reviewed-by: Robert Coulson <robert.coulson@ericsson.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/hwmon/pmbus/lm25066.c b/drivers/hwmon/pmbus/lm25066.c
index d4bc114572de..ac254fba551b 100644
--- a/drivers/hwmon/pmbus/lm25066.c
+++ b/drivers/hwmon/pmbus/lm25066.c
@@ -161,6 +161,17 @@ static int lm25066_write_word_data(struct i2c_client *client, int page, int reg,
         return ret;
 }
 
+static int lm25066_write_byte(struct i2c_client *client, int page, u8 value)
+{
+        if (page > 1)
+                return -EINVAL;
+
+        if (page == 0)
+                return pmbus_write_byte(client, 0, value);
+
+        return 0;
+}
+
 static int lm25066_probe(struct i2c_client *client,
                           const struct i2c_device_id *id)
 {
@@ -204,6 +215,7 @@ static int lm25066_probe(struct i2c_client *client,
 
         info->read_word_data = lm25066_read_word_data;
         info->write_word_data = lm25066_write_word_data;
+        info->write_byte = lm25066_write_byte;
 
         switch (id->driver_data) {
         case lm25066: