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Subject[PATCH] hwmon: (pmbus/ibm-cffps) Add another PSU CCIN to version detection
Date
There is an additional CCIN for the IBM CFFPS that may be classifed as
either version one or version two, based upon the rest of the bits of
the CCIN. Add support for it in the version detection.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
drivers/hwmon/pmbus/ibm-cffps.c | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/hwmon/pmbus/ibm-cffps.c b/drivers/hwmon/pmbus/ibm-cffps.c
index b9bfa43..7d300f2 100644
--- a/drivers/hwmon/pmbus/ibm-cffps.c
+++ b/drivers/hwmon/pmbus/ibm-cffps.c
@@ -33,9 +33,12 @@
#define CFFPS_INPUT_HISTORY_CMD 0xD6
#define CFFPS_INPUT_HISTORY_SIZE 100

+#define CFFPS_CCIN_REVISION GENMASK(7, 0)
+#define CFFPS_CCIN_REVISION_LEGACY 0xde
#define CFFPS_CCIN_VERSION GENMASK(15, 8)
#define CFFPS_CCIN_VERSION_1 0x2b
#define CFFPS_CCIN_VERSION_2 0x2e
+#define CFFPS_CCIN_VERSION_3 0x51

/* STATUS_MFR_SPECIFIC bits */
#define CFFPS_MFR_FAN_FAULT BIT(0)
@@ -486,11 +489,14 @@ static int ibm_cffps_probe(struct i2c_client *client,
vs = (enum versions)id->driver_data;

if (vs == cffps_unknown) {
+ u16 ccin_revision = 0;
u16 ccin_version = CFFPS_CCIN_VERSION_1;
int ccin = i2c_smbus_read_word_swapped(client, CFFPS_CCIN_CMD);

- if (ccin > 0)
+ if (ccin > 0) {
+ ccin_revision = FIELD_GET(CFFPS_CCIN_REVISION, ccin);
ccin_version = FIELD_GET(CFFPS_CCIN_VERSION, ccin);
+ }

switch (ccin_version) {
default:
@@ -500,6 +506,12 @@ static int ibm_cffps_probe(struct i2c_client *client,
case CFFPS_CCIN_VERSION_2:
vs = cffps2;
break;
+ case CFFPS_CCIN_VERSION_3:
+ if (ccin_revision == CFFPS_CCIN_REVISION_LEGACY)
+ vs = cffps1;
+ else
+ vs = cffps2;
+ break;
}

/* Set the client name to include the version number. */
--
1.8.3.1
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