@@ -18,6 +18,127 @@ static const struct regulator_desc __maybe_unused tda38640_reg_desc[] = {
PMBUS_REGULATOR("vout", 0),
};
+struct tda38640_data {
+ struct pmbus_driver_info info;
+ u32 en_pin_lvl;
+};
+
+#define to_tda38640_data(x) container_of(x, struct tda38640_data, info)
+
+/*
+ * Map PB_ON_OFF_CONFIG_POLARITY_HIGH to PB_OPERATION_CONTROL_ON.
+ */
+static int tda38640_read_byte_data(struct i2c_client *client, int page, int reg)
+{
+ const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+ struct tda38640_data *data = to_tda38640_data(info);
+ int ret, on_off_config, enabled;
+
+ if (reg != PMBUS_OPERATION)
+ return -ENODATA;
+
+ ret = pmbus_read_byte_data(client, page, reg);
+ if (ret < 0)
+ return ret;
+
+ on_off_config = pmbus_read_byte_data(client, page,
+ PMBUS_ON_OFF_CONFIG);
+ if (on_off_config < 0)
+ return on_off_config;
+
+ enabled = !!(on_off_config & PB_ON_OFF_CONFIG_POLARITY_HIGH);
+
+ enabled ^= data->en_pin_lvl;
+ if (enabled)
+ ret &= ~PB_OPERATION_CONTROL_ON;
+ else
+ ret |= PB_OPERATION_CONTROL_ON;
+
+ return ret;
+}
+
+/*
+ * Map PB_OPERATION_CONTROL_ON to PB_ON_OFF_CONFIG_POLARITY_HIGH.
+ */
+static int tda38640_write_byte_data(struct i2c_client *client, int page,
+ int reg, u8 byte)
+{
+ const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+ struct tda38640_data *data = to_tda38640_data(info);
+ int enable, ret;
+
+ if (reg != PMBUS_OPERATION)
+ return -ENODATA;
+
+ enable = !!(byte & PB_OPERATION_CONTROL_ON);
+
+ byte &= ~PB_OPERATION_CONTROL_ON;
+ ret = pmbus_write_byte_data(client, page, reg, byte);
+ if (ret < 0)
+ return ret;
+
+ enable ^= data->en_pin_lvl;
+
+ return pmbus_update_byte_data(client, page, PMBUS_ON_OFF_CONFIG,
+ PB_ON_OFF_CONFIG_POLARITY_HIGH,
+ enable ? 0 : PB_ON_OFF_CONFIG_POLARITY_HIGH);
+}
+
+static int svid_mode(struct i2c_client *client, struct tda38640_data *data)
+{
+ /* PMBUS_MFR_READ(0xD0) + MTP Address offset */
+ u8 write_buf[] = {0xd0, 0x44, 0x00};
+ u8 read_buf[2];
+ int ret, svid;
+ bool off, reg_en_pin_pol;
+
+ struct i2c_msg msgs[2] = {
+ {
+ .addr = client->addr,
+ .flags = 0,
+ .buf = write_buf,
+ .len = sizeof(write_buf),
+ },
+ {
+ .addr = client->addr,
+ .flags = I2C_M_RD,
+ .buf = read_buf,
+ .len = sizeof(read_buf),
+ }
+ };
+
+ ret = i2c_transfer(client->adapter, msgs, 2);
+ if (ret < 0) {
+ dev_err(&client->dev, "i2c_transfer failed. %d", ret);
+ return ret;
+ }
+
+ /*
+ * 0x44[15] determines PMBus Operating Mode
+ * If bit is set then it is SVID mode.
+ */
+ svid = !!(read_buf[1] & BIT(7));
+
+ /*
+ * Determine EN pin level for use in SVID mode.
+ * This is done with help of STATUS_BYTE bit 6(OFF) & ON_OFF_CONFIG bit 2(EN pin polarity).
+ */
+ if (svid) {
+ ret = i2c_smbus_read_byte_data(client, PMBUS_STATUS_BYTE);
+ if (ret < 0)
+ return ret;
+ off = !!(ret & PB_STATUS_OFF);
+
+ ret = i2c_smbus_read_byte_data(client, PMBUS_ON_OFF_CONFIG);
+ if (ret < 0)
+ return ret;
+ reg_en_pin_pol = !!(ret & PB_ON_OFF_CONFIG_POLARITY_HIGH);
+ data->en_pin_lvl = off ^ reg_en_pin_pol;
+ }
+
+ return svid;
+}
+
static struct pmbus_driver_info tda38640_info = {
.pages = 1,
.format[PSC_VOLTAGE_IN] = linear,
@@ -26,7 +147,6 @@ static struct pmbus_driver_info tda38640_info = {
.format[PSC_CURRENT_IN] = linear,
.format[PSC_POWER] = linear,
.format[PSC_TEMPERATURE] = linear,
-
.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT
| PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP
| PMBUS_HAVE_IIN
@@ -41,7 +161,37 @@ static struct pmbus_driver_info tda38640_info = {
static int tda38640_probe(struct i2c_client *client)
{
- return pmbus_do_probe(client, &tda38640_info);
+ struct tda38640_data *data;
+ int svid;
+
+ data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+ memcpy(&data->info, &tda38640_info, sizeof(tda38640_info));
+
+ if (IS_ENABLED(CONFIG_SENSORS_TDA38640_REGULATOR) && \
+ of_property_read_bool(client->dev.of_node, "infineon,en-pin-fixed-level")) {
+ svid = svid_mode(client, data);
+ if (svid < 0) {
+ dev_err_probe(&client->dev, svid, "Could not determine operating mode.");
+ return svid;
+ }
+
+ /*
+ * Apply ON_OFF_CONFIG workaround as enabling the regulator using the
+ * OPERATION register doesn't work in SVID mode.
+ *
+ * One should configure PMBUS_ON_OFF_CONFIG here, but
+ * PB_ON_OFF_CONFIG_POWERUP_CONTROL and PB_ON_OFF_CONFIG_EN_PIN_REQ
+ * are ignored by the device.
+ * Only PB_ON_OFF_CONFIG_POLARITY_HIGH has an effect.
+ */
+ if (svid) {
+ data->info.read_byte_data = tda38640_read_byte_data;
+ data->info.write_byte_data = tda38640_write_byte_data;
+ }
+ }
+ return pmbus_do_probe(client, &data->info);
}
static const struct i2c_device_id tda38640_id[] = {