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authorEdward A. James <eajames@us.ibm.com>2017-08-21 14:46:12 -0500
committerGuenter Roeck <linux@roeck-us.net>2017-08-29 18:06:18 -0700
commitf69316d62c7066edc4693b85c6e9f987eed62772 (patch)
tree77c8bbb6ab1349f650ada7d50819ee35edadf341 /drivers/hwmon
parent74560e4a440891649971a11e518681b088c6a1f9 (diff)
downloadlinux-f69316d62c7066edc4693b85c6e9f987eed62772.tar.bz2
hwmon: (pmbus) Add IBM Common Form Factor (CFF) power supply driver
Add the driver to monitor IBM CFF power supplies with hwmon over pmbus. Signed-off-by: Edward A. James <eajames@us.ibm.com> [groeck: drop 'default n'; include bitops.h instead of jiffies.h] Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon')
-rw-r--r--drivers/hwmon/pmbus/Kconfig9
-rw-r--r--drivers/hwmon/pmbus/Makefile1
-rw-r--r--drivers/hwmon/pmbus/ibm-cffps.c151
3 files changed, 161 insertions, 0 deletions
diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index 68d717a3fd59..522ac37d8a69 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -37,6 +37,15 @@ config SENSORS_ADM1275
This driver can also be built as a module. If so, the module will
be called adm1275.
+config SENSORS_IBM_CFFPS
+ tristate "IBM Common Form Factor Power Supply"
+ help
+ If you say yes here you get hardware monitoring support for the IBM
+ Common Form Factor power supply.
+
+ This driver can also be built as a module. If so, the module will
+ be called ibm-cffps.
+
config SENSORS_IR35221
tristate "Infineon IR35221"
default n
diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
index 75bb7ca619d9..737fa4efb3cc 100644
--- a/drivers/hwmon/pmbus/Makefile
+++ b/drivers/hwmon/pmbus/Makefile
@@ -5,6 +5,7 @@
obj-$(CONFIG_PMBUS) += pmbus_core.o
obj-$(CONFIG_SENSORS_PMBUS) += pmbus.o
obj-$(CONFIG_SENSORS_ADM1275) += adm1275.o
+obj-$(CONFIG_SENSORS_IBM_CFFPS) += ibm-cffps.o
obj-$(CONFIG_SENSORS_IR35221) += ir35221.o
obj-$(CONFIG_SENSORS_LM25066) += lm25066.o
obj-$(CONFIG_SENSORS_LTC2978) += ltc2978.o
diff --git a/drivers/hwmon/pmbus/ibm-cffps.c b/drivers/hwmon/pmbus/ibm-cffps.c
new file mode 100644
index 000000000000..cb56da6834e5
--- /dev/null
+++ b/drivers/hwmon/pmbus/ibm-cffps.c
@@ -0,0 +1,151 @@
+/*
+ * 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/bitops.h>
+#include <linux/device.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+
+#include "pmbus.h"
+
+/* STATUS_MFR_SPECIFIC bits */
+#define CFFPS_MFR_FAN_FAULT BIT(0)
+#define CFFPS_MFR_THERMAL_FAULT BIT(1)
+#define CFFPS_MFR_OV_FAULT BIT(2)
+#define CFFPS_MFR_UV_FAULT BIT(3)
+#define CFFPS_MFR_PS_KILL BIT(4)
+#define CFFPS_MFR_OC_FAULT BIT(5)
+#define CFFPS_MFR_VAUX_FAULT BIT(6)
+#define CFFPS_MFR_CURRENT_SHARE_WARNING BIT(7)
+
+static int ibm_cffps_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 the status register instead of an error,
+ * since we successfully read status.
+ */
+ return rc;
+
+ /* Add MFR_SPECIFIC bits to the standard pmbus status regs. */
+ if (reg == PMBUS_STATUS_FAN_12) {
+ if (mfr & CFFPS_MFR_FAN_FAULT)
+ rc |= PB_FAN_FAN1_FAULT;
+ } else if (reg == PMBUS_STATUS_TEMPERATURE) {
+ if (mfr & CFFPS_MFR_THERMAL_FAULT)
+ rc |= PB_TEMP_OT_FAULT;
+ } else if (reg == PMBUS_STATUS_VOUT) {
+ if (mfr & (CFFPS_MFR_OV_FAULT | CFFPS_MFR_VAUX_FAULT))
+ rc |= PB_VOLTAGE_OV_FAULT;
+ if (mfr & CFFPS_MFR_UV_FAULT)
+ rc |= PB_VOLTAGE_UV_FAULT;
+ } else if (reg == PMBUS_STATUS_IOUT) {
+ if (mfr & CFFPS_MFR_OC_FAULT)
+ rc |= PB_IOUT_OC_FAULT;
+ if (mfr & CFFPS_MFR_CURRENT_SHARE_WARNING)
+ rc |= PB_CURRENT_SHARE_FAULT;
+ }
+ break;
+ default:
+ rc = -ENODATA;
+ break;
+ }
+
+ return rc;
+}
+
+static int ibm_cffps_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 the status register instead of an error,
+ * since we successfully read status.
+ */
+ return rc;
+
+ if (mfr & CFFPS_MFR_PS_KILL)
+ rc |= PB_STATUS_OFF;
+ break;
+ default:
+ rc = -ENODATA;
+ break;
+ }
+
+ return rc;
+}
+
+static struct pmbus_driver_info ibm_cffps_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 = ibm_cffps_read_byte_data,
+ .read_word_data = ibm_cffps_read_word_data,
+};
+
+static int ibm_cffps_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ return pmbus_do_probe(client, id, &ibm_cffps_info);
+}
+
+static const struct i2c_device_id ibm_cffps_id[] = {
+ { "ibm_cffps1", 1 },
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, ibm_cffps_id);
+
+static const struct of_device_id ibm_cffps_of_match[] = {
+ { .compatible = "ibm,cffps1" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, ibm_cffps_of_match);
+
+static struct i2c_driver ibm_cffps_driver = {
+ .driver = {
+ .name = "ibm-cffps",
+ .of_match_table = ibm_cffps_of_match,
+ },
+ .probe = ibm_cffps_probe,
+ .remove = pmbus_do_remove,
+ .id_table = ibm_cffps_id,
+};
+
+module_i2c_driver(ibm_cffps_driver);
+
+MODULE_AUTHOR("Eddie James");
+MODULE_DESCRIPTION("PMBus driver for IBM Common Form Factor power supplies");
+MODULE_LICENSE("GPL");