linux-kernel - [PATCH] hwmon: (adm1275) Enable adm1278 VOUT sampling

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Message-Id: <20161014100605.23887-1-joel@jms.id.au>
Date:   Fri, 14 Oct 2016 20:36:05 +1030
From:   Joel Stanley <joel@....id.au>
To:     linux@...ck-us.net, jdelvare@...e.com
Cc:     Yi Li <adamliyi@....com>, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] hwmon: (adm1275) Enable adm1278 VOUT sampling

From: Yi Li <adamliyi@....com>

The adm1278 can optionally monitor the VOUT pin. This functionality is
not enabled at reset, so PMON_CONFIG needs to be modified in order to
enable it.

Signed-off-by: Yi Li <adamliyi@....com>
Signed-off-by: Joel Stanley <joel@....id.au>
---

Guenter, I'm not sure if this is a valid thing to do in the probe function. If
not, can you suggest an alternative method for enabling this?

 drivers/hwmon/pmbus/adm1275.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/hwmon/pmbus/adm1275.c b/drivers/hwmon/pmbus/adm1275.c
index 3baa4f4a8c5e..7d1f5f7891cc 100644
--- a/drivers/hwmon/pmbus/adm1275.c
+++ b/drivers/hwmon/pmbus/adm1275.c
@@ -500,6 +500,19 @@ static int adm1275_probe(struct i2c_client *client,
 		tindex = 3;
 
 		info->func[0] |= PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT;
+
+		/* By default when reset VOUT is not enabled */
+		if (!(config & ADM1278_VOUT_EN)) {
+			config |= ADM1278_VOUT_EN;
+			ret = i2c_smbus_write_byte_data(client,
+							ADM1275_PMON_CONFIG,
+							config);
+			if (ret < 0) {
+				dev_warn(&client->dev,
+					"Failed to enable VOUT monitoring\n");
+			}
+		}
+
 		if (config & ADM1278_TEMP1_EN)
 			info->func[0] |=
 				PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
-- 
2.9.3