INA233 power monitor support
- Add PMBus driver for TI INA233 power monitor.
Change-Id: Iaea3047cb9d10e5c4751b61e1b609fe4800d4fa3
diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index 4001932..ffa1cab2 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -187,4 +187,10 @@
This driver can also be built as a module. If so, the module will
be called zl6100.
+config SENSORS_INA233
+ tristate "TI INA233"
+ default n
+ help
+ If you say yes here you get hardware monitoring support for TI INA233.
+
endif # PMBUS
diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
index e936442..12bbb4f 100644
--- a/drivers/hwmon/pmbus/Makefile
+++ b/drivers/hwmon/pmbus/Makefile
@@ -20,3 +20,4 @@
obj-$(CONFIG_SENSORS_UCD9000) += ucd9000.o
obj-$(CONFIG_SENSORS_UCD9200) += ucd9200.o
obj-$(CONFIG_SENSORS_ZL6100) += zl6100.o
+obj-$(CONFIG_SENSORS_INA233) += ina233.o
diff --git a/drivers/hwmon/pmbus/ina233.c b/drivers/hwmon/pmbus/ina233.c
new file mode 100644
index 0000000..185a246
--- /dev/null
+++ b/drivers/hwmon/pmbus/ina233.c
@@ -0,0 +1,79 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for the TI INA233 current/power monitor.
+ *
+ * Copyright (C) 2018 Google, Inc.
+ */
+
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include "pmbus.h"
+
+#define CAL_FACTOR 5120000 // 1mA / LSB
+#define MFR_CALIBRATION 0xD4
+
+static struct pmbus_driver_info ina233_info = {
+ .pages = 1,
+ .format[PSC_VOLTAGE_IN] = direct,
+ .format[PSC_VOLTAGE_OUT] = direct,
+ .format[PSC_CURRENT_IN] = direct,
+ .format[PSC_CURRENT_OUT] = direct,
+ .format[PSC_POWER] = direct,
+ .m[PSC_VOLTAGE_IN] = 8,
+ .b[PSC_VOLTAGE_IN] = 0,
+ .R[PSC_VOLTAGE_IN] = 2,
+ .m[PSC_VOLTAGE_OUT] = 8,
+ .b[PSC_VOLTAGE_OUT] = 0,
+ .R[PSC_VOLTAGE_OUT] = 2,
+ .m[PSC_CURRENT_IN] = 1000,
+ .b[PSC_CURRENT_IN] = 0,
+ .R[PSC_CURRENT_IN] = 0,
+ .m[PSC_CURRENT_OUT] = 1000,
+ .b[PSC_CURRENT_OUT] = 0,
+ .R[PSC_CURRENT_OUT] = 0,
+ .m[PSC_POWER] = 40,
+ .b[PSC_POWER] = 0,
+ .R[PSC_POWER] = 0,
+ .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN |
+ PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN | PMBUS_HAVE_POUT |
+ PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_INPUT,
+};
+
+static int ina233_probe(
+ struct i2c_client *client, const struct i2c_device_id *id)
+{
+ u32 shunt_val;
+ struct device *dev = &client->dev;
+
+ // Setup calibration register
+ if (of_property_read_u32(dev->of_node, "shunt-resistor", &shunt_val) <
+ 0) {
+ dev_err(dev, "No shunt-resistor property found!");
+ return -ENODEV;
+ }
+ i2c_smbus_write_word_data(
+ client, MFR_CALIBRATION, CAL_FACTOR / shunt_val);
+
+ return pmbus_do_probe(client, id, &ina233_info);
+}
+
+static const struct i2c_device_id ina233_id[] = {
+ { "ina233", 0 },
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, ina233_id);
+
+static struct i2c_driver ina233_driver = {
+ .driver = {
+ .name = "ina233",
+ },
+ .probe = ina233_probe,
+ .remove = pmbus_do_remove,
+ .id_table = ina233_id,
+ };
+module_i2c_driver(ina233_driver);
+
+MODULE_AUTHOR("Alex Van Damme <atv@google.com>");
+MODULE_DESCRIPTION("PMBus driver for TI INA233");
+MODULE_LICENSE("GPL v2");
