From 83bed3c159f44bf2e205875feb8d932bbcf1b656 Mon Sep 17 00:00:00 2001 From: Jerome Brunet Date: Mon, 2 Dec 2024 11:28:01 +0100 Subject: hwmon: (pmbus/core) add wp module param Add a module parameter to force the write protection mode of pmbus chips. 4 protections modes are provided to start with: * 0: Remove the write protection * 1: Disable all writes except to the WRITE_PROTECT, OPERATION, PAGE, ON_OFF_CONFIG and VOUT_COMMAND commands * 2: Disable all writes except to the WRITE_PROTECT, OPERATION and PAGE commands * 3: Disable all writes except to the WRITE_PROTECT command Of course, if the parameter is not provided, the default write protection status of the pmbus chips is left untouched. Suggested-by: Guenter Roeck Signed-off-by: Jerome Brunet Signed-off-by: Guenter Roeck --- drivers/hwmon/pmbus/pmbus_core.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) (limited to 'drivers') diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c index 5976dd819b3c..a7000314e5ad 100644 --- a/drivers/hwmon/pmbus/pmbus_core.c +++ b/drivers/hwmon/pmbus/pmbus_core.c @@ -31,6 +31,9 @@ #define PMBUS_ATTR_ALLOC_SIZE 32 #define PMBUS_NAME_SIZE 24 +static int wp = -1; +module_param(wp, int, 0444); + struct pmbus_sensor { struct pmbus_sensor *next; char name[PMBUS_NAME_SIZE]; /* sysfs sensor name */ @@ -2669,6 +2672,32 @@ static void pmbus_init_wp(struct i2c_client *client, struct pmbus_data *data) { int ret; + switch (wp) { + case 0: + _pmbus_write_byte_data(client, -1, + PMBUS_WRITE_PROTECT, 0); + break; + + case 1: + _pmbus_write_byte_data(client, -1, + PMBUS_WRITE_PROTECT, PB_WP_VOUT); + break; + + case 2: + _pmbus_write_byte_data(client, -1, + PMBUS_WRITE_PROTECT, PB_WP_OP); + break; + + case 3: + _pmbus_write_byte_data(client, -1, + PMBUS_WRITE_PROTECT, PB_WP_ALL); + break; + + default: + /* Ignore the other values */ + break; + } + ret = _pmbus_read_byte_data(client, -1, PMBUS_WRITE_PROTECT); if (ret < 0) return; -- cgit v1.2.3