From: "Edward A. James" <eaja...@us.ibm.com>

Add the driver to monitor POWER system power supplies with hwmon over
pmbus.

Signed-off-by: Edward A. James <eaja...@us.ibm.com>
---
 drivers/hwmon/pmbus/Kconfig   |  10 +++
 drivers/hwmon/pmbus/Makefile  |   1 +
 drivers/hwmon/pmbus/powerps.c | 144 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 155 insertions(+)
 create mode 100644 drivers/hwmon/pmbus/powerps.c

diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index 68d717a..8925c1a 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -125,6 +125,16 @@ config SENSORS_MAX8688
          This driver can also be built as a module. If so, the module will
          be called max8688.
 
+config SENSORS_POWERPS
+       tristate "IBM POWER System Power Supply"
+       default n
+       help
+         If you say yes here you get hardware monitoring support for the IBM
+         POWER system power supply.
+
+         This driver can also be built as a module. If so, the module will
+         be called powerps.
+
 config SENSORS_TPS40422
        tristate "TI TPS40422"
        default n
diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
index 75bb7ca..3303af5 100644
--- a/drivers/hwmon/pmbus/Makefile
+++ b/drivers/hwmon/pmbus/Makefile
@@ -13,6 +13,7 @@ obj-$(CONFIG_SENSORS_MAX16064)        += max16064.o
 obj-$(CONFIG_SENSORS_MAX20751) += max20751.o
 obj-$(CONFIG_SENSORS_MAX34440) += max34440.o
 obj-$(CONFIG_SENSORS_MAX8688)  += max8688.o
+obj-$(CONFIG_SENSORS_POWERPS)  += powerps.o
 obj-$(CONFIG_SENSORS_TPS40422) += tps40422.o
 obj-$(CONFIG_SENSORS_UCD9000)  += ucd9000.o
 obj-$(CONFIG_SENSORS_UCD9200)  += ucd9200.o
diff --git a/drivers/hwmon/pmbus/powerps.c b/drivers/hwmon/pmbus/powerps.c
new file mode 100644
index 0000000..21d28f2
--- /dev/null
+++ b/drivers/hwmon/pmbus/powerps.c
@@ -0,0 +1,144 @@
+/*
+ * Copyright 2017 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.
+ */
+
+#include <linux/device.h>
+#include <linux/i2c.h>
+#include <linux/jiffies.h>
+#include <linux/module.h>
+
+#include "pmbus.h"
+
+/* STATUS_MFR_SPECIFIC bits */
+#define POWERPS_MFR_FAN_FAULT                  BIT(0)
+#define POWERPS_MFR_THERMAL_FAULT              BIT(1)
+#define POWERPS_MFR_OV_FAULT                   BIT(2)
+#define POWERPS_MFR_UV_FAULT                   BIT(3)
+#define POWERPS_MFR_PS_KILL                    BIT(4)
+#define POWERPS_MFR_OC_FAULT                   BIT(5)
+#define POWERPS_MFR_VAUX_FAULT                 BIT(6)
+#define POWERPS_MFR_CURRENT_SHARE_WARNING      BIT(7)
+
+static int powerps_read_byte_data(struct i2c_client *client, int page, int reg)
+{
+       int rc, mfr;
+
+       switch (reg) {
+       case PMBUS_STATUS_VOUT:
+       case PMBUS_STATUS_IOUT:
+       case PMBUS_STATUS_TEMPERATURE:
+       case PMBUS_STATUS_FAN_12:
+               rc = pmbus_read_byte_data(client, page, reg);
+               if (rc < 0)
+                       return rc;
+
+               mfr = pmbus_read_byte_data(client, page,
+                                          PMBUS_STATUS_MFR_SPECIFIC);
+               if (mfr < 0)
+                       return rc;
+
+               /* Add MFR_SPECIFIC bits to the standard pmbus status regs. */
+               if (reg == PMBUS_STATUS_FAN_12) {
+                       if (mfr & POWERPS_MFR_FAN_FAULT)
+                               rc |= PB_FAN_FAN1_FAULT;
+               } else if (reg == PMBUS_STATUS_TEMPERATURE) {
+                       if (mfr & POWERPS_MFR_THERMAL_FAULT)
+                               rc |= PB_TEMP_OT_FAULT;
+               } else if (reg == PMBUS_STATUS_VOUT) {
+                       if (mfr &
+                           (POWERPS_MFR_OV_FAULT | POWERPS_MFR_VAUX_FAULT))
+                               rc |= PB_VOLTAGE_OV_FAULT;
+                       if (mfr & POWERPS_MFR_UV_FAULT)
+                               rc |= PB_VOLTAGE_UV_FAULT;
+               } else if (reg == PMBUS_STATUS_IOUT) {
+                       if (mfr & POWERPS_MFR_OC_FAULT)
+                               rc |= PB_IOUT_OC_FAULT;
+                       if (mfr & POWERPS_MFR_CURRENT_SHARE_WARNING)
+                               rc |= PB_CURRENT_SHARE_FAULT;
+               }
+               break;
+       default:
+               rc = -ENODATA;
+               break;
+       }
+
+       return rc;
+}
+
+static int powerps_read_word_data(struct i2c_client *client, int page, int reg)
+{
+       int rc, mfr;
+
+       switch (reg) {
+       case PMBUS_STATUS_WORD:
+               rc = pmbus_read_word_data(client, page, reg);
+               if (rc < 0)
+                       return rc;
+
+               mfr = pmbus_read_byte_data(client, page,
+                                          PMBUS_STATUS_MFR_SPECIFIC);
+               if (mfr < 0)
+                       return rc;
+
+               if (mfr & POWERPS_MFR_PS_KILL)
+                       rc |= PB_STATUS_OFF;
+               break;
+       default:
+               rc = -ENODATA;
+               break;
+       }
+
+       return rc;
+}
+
+static struct pmbus_driver_info powerps_info = {
+       .pages = 1,
+       .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
+               PMBUS_HAVE_PIN | PMBUS_HAVE_FAN12 | PMBUS_HAVE_TEMP |
+               PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_VOUT |
+               PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_INPUT |
+               PMBUS_HAVE_STATUS_TEMP | PMBUS_HAVE_STATUS_FAN12,
+       .read_byte_data = powerps_read_byte_data,
+       .read_word_data = powerps_read_word_data,
+       .debugfs = true,
+};
+
+static int powerps_probe(struct i2c_client *client,
+                        const struct i2c_device_id *id)
+{
+       return pmbus_do_probe(client, id, &powerps_info);
+}
+
+static const struct i2c_device_id powerps_id[] = {
+       { "power_ps", 1 },
+       {}
+};
+MODULE_DEVICE_TABLE(i2c, powerps_id);
+
+/* IBM provides many compatible power supplies; use a generic name. */
+static const struct of_device_id powerps_of_match[] = {
+       { .compatible = "ibm,power-ps" },
+       {}
+};
+MODULE_DEVICE_TABLE(of, powerps_of_match);
+
+static struct i2c_driver powerps_driver = {
+       .driver = {
+               .name = "powerps",
+               .of_match_table = powerps_of_match,
+       },
+       .probe = powerps_probe,
+       .remove = pmbus_do_remove,
+       .id_table = powerps_id,
+};
+
+module_i2c_driver(powerps_driver);
+
+MODULE_AUTHOR("Eddie James");
+MODULE_DESCRIPTION("PMBus driver for POWER system power supplies");
+MODULE_LICENSE("GPL");
-- 
1.8.3.1

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