new file mode 100644
@@ -0,0 +1,13 @@
+HWMON I2C driver for IBM POWER CPU OCC (On Chip Controller)
+
+Required properties:
+ - compatible: must be "ibm,p8-occ-i2c"
+ - reg: physical address
+
+Example:
+i2c3: i2c-bus@100 {
+ occ@50 {
+ compatible = "ibm,p8-occ-i2c";
+ reg = <0x50>;
+ };
+};
@@ -13,3 +13,17 @@ menuconfig SENSORS_PPC_OCC
This driver can also be built as a module. If so, the module
will be called occ.
+
+if SENSORS_PPC_OCC
+
+config SENSORS_PPC_OCC_P8_I2C
+ tristate "POWER8 OCC hwmon support"
+ depends on I2C
+ help
+ Provide a hwmon sysfs interface for the POWER8 On-Chip Controller,
+ exposing temperature, frequency and power measurements.
+
+ This driver can also be built as a module. If so, the module will be
+ called p8-occ-i2c.
+
+endif
@@ -1 +1,2 @@
obj-$(CONFIG_SENSORS_PPC_OCC) += occ.o occ_sysfs.o
+obj-$(CONFIG_SENSORS_PPC_OCC_P8_I2C) += occ_scom_i2c.o occ_p8.o p8_occ_i2c.o
new file mode 100644
@@ -0,0 +1,104 @@
+/*
+ * p8_occ_i2c.c - hwmon OCC driver
+ *
+ * This file contains the i2c layer for accessing the P8 OCC over i2c bus.
+ *
+ * Copyright 2016 IBM Corp.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/slab.h>
+#include "occ_p8.h"
+#include "occ_scom_i2c.h"
+#include "occ_sysfs.h"
+#include "scom.h"
+
+#define P8_OCC_I2C_NAME "p8-occ-i2c"
+
+int p8_i2c_getscom(void *bus, u32 address, u64 *data)
+{
+ /* P8 i2c slave requires address to be shifted by 1 */
+ address = address << 1;
+
+ return occ_i2c_getscom(bus, address, data);
+}
+
+int p8_i2c_putscom(void *bus, u32 address, u32 data0, u32 data1)
+{
+ /* P8 i2c slave requires address to be shifted by 1 */
+ address = address << 1;
+
+ return occ_i2c_putscom(bus, address, data0, data1);
+}
+
+static struct occ_bus_ops p8_bus_ops = {
+ .getscom = p8_i2c_getscom,
+ .putscom = p8_i2c_putscom,
+};
+
+static int p8_occ_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct occ *occ;
+ struct occ_sysfs *hwmon;
+ const u32 *sensor_hwmon_configs = p8_get_sensor_hwmon_configs();
+
+ occ = p8_occ_start(&client->dev, client, &p8_bus_ops);
+ if (IS_ERR(occ))
+ return PTR_ERR(occ);
+
+ hwmon = occ_sysfs_start(&client->dev, occ, sensor_hwmon_configs,
+ P8_OCC_I2C_NAME);
+ if (IS_ERR(hwmon))
+ return PTR_ERR(hwmon);
+
+ i2c_set_clientdata(client, occ);
+
+ return 0;
+}
+
+/* used by old-style board info. */
+static const struct i2c_device_id occ_ids[] = {
+ { P8_OCC_I2C_NAME, 0 },
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, occ_ids);
+
+/* used by device table */
+static const struct of_device_id occ_of_match[] = {
+ { .compatible = "ibm,p8-occ-i2c" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, occ_of_match);
+
+static struct i2c_driver p8_occ_driver = {
+ .class = I2C_CLASS_HWMON,
+ .driver = {
+ .name = P8_OCC_I2C_NAME,
+ .of_match_table = occ_of_match,
+ },
+ .probe = p8_occ_probe,
+ .id_table = occ_ids,
+};
+
+module_i2c_driver(p8_occ_driver);
+
+MODULE_AUTHOR("Eddie James <eajames@us.ibm.com>");
+MODULE_DESCRIPTION("BMC P8 OCC hwmon driver");
+MODULE_LICENSE("GPL");