From: Patrick Rudolph <patrick.rudolph@xxxxxxxxxxxxx>
The MP2971/MP2973 use a custom 16bit register format for
SMBALERT_MASK which doesn't follow the PMBUS specification.
Map the PMBUS defined bits used by the common code onto the custom
format used by MPS and since the SMBALERT_MASK is currently never read
by common code only implement the mapping for write transactions.
Signed-off-by: Patrick Rudolph <patrick.rudolph@xxxxxxxxxxxxx>
Signed-off-by: Naresh Solanki <naresh.solanki@xxxxxxxxxxxxx>
---
Changes in V3:
1. Avoid precedence issues in Macro
2. Optimise macro.
Changes in V2:
1. Add/Update comment
2. Update SWAP define to include both variable.
3. Add defines for each bits of SMBALERT mask.
---
drivers/hwmon/pmbus/mp2975.c | 77 ++++++++++++++++++++++++++++++++++++
1 file changed, 77 insertions(+)
diff --git a/drivers/hwmon/pmbus/mp2975.c b/drivers/hwmon/pmbus/mp2975.c
index e5fa10b3b8bc..953c02a2aeb5 100644
--- a/drivers/hwmon/pmbus/mp2975.c
+++ b/drivers/hwmon/pmbus/mp2975.c
@@ -392,6 +392,82 @@ static int mp2973_read_word_data(struct i2c_client *client, int page,
return ret;
}
+static int mp2973_write_word_data(struct i2c_client *client, int page,
+ int reg, u16 word)
+{
+ u8 target, mask;
+ int ret;
+
+ if (reg != PMBUS_SMBALERT_MASK)
+ return -ENODATA;
+
+ /*
+ * Vendor-specific SMBALERT_MASK register with 16 maskable bits.
+ */
+ ret = pmbus_read_word_data(client, 0, 0, PMBUS_SMBALERT_MASK);
+ if (ret < 0)
+ return ret;
+
+ target = word & 0xff;
+ mask = word >> 8;
+
+/*
+ * Set/Clear 'bit' in 'ret' based on condition followed by define for each bit in SMBALERT_MASK.
+ * Also bit 2 & 15 are reserved.
+ */
+#define SWAP(val, mask, cond, bit) (((mask) & (cond)) ? ((val) & ~BIT(bit)) : ((val) | BIT(bit)))
+
+#define MP2973_TEMP_OT 0
+#define MP2973_VIN_UVLO 1
+#define MP2973_VIN_OVP 3
+#define MP2973_MTP_FAULT 4
+#define MP2973_OTHER_COMM 5
+#define MP2973_MTP_BLK_TRIG 6
+#define MP2973_PACKET_ERROR 7
+#define MP2973_INVALID_DATA 8
+#define MP2973_INVALID_COMMAND 9
+#define MP2973_IOUT_OC_LV 10
+#define MP2973_IOUT_OC 11
+#define MP2973_VOUT_MAX_MIN_WARNING 12
+#define MP2973_VOLTAGE_UV 13
+#define MP2973_VOLTAGE_OV 14
+
+ switch (target) {
+ case PMBUS_STATUS_CML:
+ ret = SWAP(ret, mask, PB_CML_FAULT_INVALID_DATA, MP2973_INVALID_DATA);
+ ret = SWAP(ret, mask, PB_CML_FAULT_INVALID_COMMAND, MP2973_INVALID_COMMAND);
+ ret = SWAP(ret, mask, PB_CML_FAULT_OTHER_COMM, MP2973_OTHER_COMM);
+ ret = SWAP(ret, mask, PB_CML_FAULT_PACKET_ERROR, MP2973_PACKET_ERROR);
+ break;
+ case PMBUS_STATUS_VOUT:
+ ret = SWAP(ret, mask, PB_VOLTAGE_UV_FAULT, MP2973_VOLTAGE_UV);
+ ret = SWAP(ret, mask, PB_VOLTAGE_OV_FAULT, MP2973_VOLTAGE_OV);
+ break;
+ case PMBUS_STATUS_IOUT:
+ ret = SWAP(ret, mask, PB_IOUT_OC_FAULT, MP2973_IOUT_OC);
+ ret = SWAP(ret, mask, PB_IOUT_OC_LV_FAULT, MP2973_IOUT_OC_LV);
+ break;
+ case PMBUS_STATUS_TEMPERATURE:
+ ret = SWAP(ret, mask, PB_TEMP_OT_FAULT, MP2973_TEMP_OT);
+ break;
+ /*
+ * Map remaining bits to MFR specific to let the PMBUS core mask
+ * those bits by default.
+ */
+ case PMBUS_STATUS_MFR_SPECIFIC:
+ ret = SWAP(ret, mask, BIT(1), MP2973_VIN_UVLO);
+ ret = SWAP(ret, mask, BIT(3), MP2973_VIN_OVP);
+ ret = SWAP(ret, mask, BIT(4), MP2973_MTP_FAULT);
+ ret = SWAP(ret, mask, BIT(6), MP2973_MTP_BLK_TRIG);
+ break;
+ default:
+ return 0;
+ }
+#undef SWAP
+
+ return pmbus_write_word_data(client, 0, PMBUS_SMBALERT_MASK, ret);
+}
+
static int mp2975_read_word_data(struct i2c_client *client, int page,
int phase, int reg)
{
@@ -907,6 +983,7 @@ static struct pmbus_driver_info mp2973_info = {
PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP | PMBUS_HAVE_POUT |
PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT,
.read_word_data = mp2973_read_word_data,
+ .write_word_data = mp2973_write_word_data,
#if IS_ENABLED(CONFIG_SENSORS_MP2975_REGULATOR)
.num_regulators = 1,
.reg_desc = mp2975_reg_desc,
base-commit: 8debe3c1295ef36958dae77487eed9cf6584c008
--
2.42.0
