linux-kernel - [PATCH 2/2] hwmon: (pmbus/ibm-cffps) Use MFR

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Message-Id: <20211004144339.2634330-2-bjwyman@gmail.com>
Date:   Mon,  4 Oct 2021 14:43:39 +0000
From:   Brandon Wyman <bjwyman@...il.com>
To:     Joel Stanley <joel@....id.au>, openbmc@...ts.ozlabs.org,
        Guenter Roeck <linux@...ck-us.net>,
        Jean Delvare <jdelvare@...e.com>, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org, Eddie James <eajames@...ux.ibm.com>
Cc:     Brandon Wyman <bjwyman@...il.com>
Subject: [PATCH 2/2] hwmon: (pmbus/ibm-cffps) Use MFR_ID to choose version

There are multiple power supplies that will indicate
CFFPS_CCIN_VERSION_1, use the manufacturer ID to determine if it should
be treated as version cffps1 or version cffps2.

Signed-off-by: Brandon Wyman <bjwyman@...il.com>
---
 drivers/hwmon/pmbus/ibm-cffps.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/hwmon/pmbus/ibm-cffps.c b/drivers/hwmon/pmbus/ibm-cffps.c
index 2ee47cbbb665..292c87331f2b 100644
--- a/drivers/hwmon/pmbus/ibm-cffps.c
+++ b/drivers/hwmon/pmbus/ibm-cffps.c
@@ -502,16 +502,29 @@ static int ibm_cffps_probe(struct i2c_client *client)
 		u16 ccin_revision = 0;
 		u16 ccin_version = CFFPS_CCIN_VERSION_1;
 		int ccin = i2c_smbus_read_word_swapped(client, CFFPS_CCIN_CMD);
+		char mfg_id[I2C_SMBUS_BLOCK_MAX + 2] = { 0 };
 
 		if (ccin > 0) {
 			ccin_revision = FIELD_GET(CFFPS_CCIN_REVISION, ccin);
 			ccin_version = FIELD_GET(CFFPS_CCIN_VERSION, ccin);
 		}
 
+		rc = i2c_smbus_read_block_data(client, PMBUS_MFR_ID,
+				mfg_id);
+		if (rc < 0) {
+			dev_err(&client->dev,
+					"Failed to read Manufacturer ID\n");
+			return rc;
+		}
+
 		switch (ccin_version) {
 		default:
 		case CFFPS_CCIN_VERSION_1:
-			vs = cffps1;
+			if ((strncmp(mfg_id, "ACBE", 4) == 0) ||
+					(strncmp(mfg_id, "ARTE", 4) == 0))
+				vs = cffps1;
+			else
+				vs = cffps2;
 			break;
 		case CFFPS_CCIN_VERSION_2:
 			vs = cffps2;
-- 
2.25.1