drivers/hwmon/pmbus: Add IBM P17531 driver

From: "Edward A. James" <[email protected]>

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

Signed-off-by Edward A. James <[email protected]>

---
 drivers/hwmon/pmbus/Kconfig  |  10 +++
 drivers/hwmon/pmbus/Makefile |   1 +
 drivers/hwmon/pmbus/p17531.c | 165 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 176 insertions(+)
 create mode 100644 drivers/hwmon/pmbus/p17531.c

drivers/hwmon/pmbus/Kconfig +10 -0

index 04f6baa..033aeda 100644
@@ -135,6 +135,16 @@ config SENSORS_MAX8688
          This driver can also be built as a module. If so, the module will
          be called max8688.
 
+config SENSORS_P17531
+       tristate "IBM P17531"
+       default n
+       help
+         If you say yes here you get hardware monitoring support for IBM
+         P17531 power supply.
+
+         This driver can also be built as a module. If so, the module will
+         be called p17531.
+
 config SENSORS_TPS40422
        tristate "TI TPS40422"
        default n

drivers/hwmon/pmbus/Makefile +1 -0

index 663801c..b0625ec 100644
@@ -14,6 +14,7 @@ obj-$(CONFIG_SENSORS_MAX20751)        += max20751.o
 obj-$(CONFIG_SENSORS_MAX31785) += max31785.o
 obj-$(CONFIG_SENSORS_MAX34440) += max34440.o
 obj-$(CONFIG_SENSORS_MAX8688)  += max8688.o
+obj-$(CONFIG_SENSORS_P17531)   += p17531.o
 obj-$(CONFIG_SENSORS_TPS40422) += tps40422.o
 obj-$(CONFIG_SENSORS_UCD9000)  += ucd9000.o
 obj-$(CONFIG_SENSORS_UCD9200)  += ucd9200.o

drivers/hwmon/pmbus/p17531.c new file +165 -1

new file mode 100644
index 0000000..2190f8c
@@ -0,0 +1,165 @@
+/*
+ * 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"
+
+#define P17531_MFR_FAN_FAULT                   BIT(0)
+#define P17531_MFR_THERMAL_FAULT               BIT(1)
+#define P17531_MFR_OV_FAULT                    BIT(2)
+#define P17531_MFR_UV_FAULT                    BIT(3)
+#define P17531_MFR_PS_KILL                     BIT(4)
+#define P17531_MFR_OC_FAULT                    BIT(5)
+#define P17531_MFR_VAUX_FAULT                  BIT(6)
+#define P17531_MFR_CURRENT_SHARE_WARNING       BIT(7)
+
+static int p17531_read_word_data(struct i2c_client *client, int page, int reg);
+
+static int p17531_read_byte_data(struct i2c_client *client, int page, int reg)
+{
+       int rc, mfr;
+
+       switch (reg) {
+       case PMBUS_STATUS_BYTE:
+       case PMBUS_STATUS_WORD:
+               rc = p17531_read_word_data(client, page, PMBUS_STATUS_WORD);
+               break;
+       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;
+
+               if (reg == PMBUS_STATUS_FAN_12) {
+                       if (mfr & P17531_MFR_FAN_FAULT)
+                               rc |= PB_FAN_FAN1_FAULT;
+               } else if (reg == PMBUS_STATUS_TEMPERATURE) {
+                       if (mfr & P17531_MFR_THERMAL_FAULT)
+                               rc |= PB_TEMP_OT_FAULT;
+               } else if (reg == PMBUS_STATUS_VOUT) {
+                       if (mfr &
+                           (P17531_MFR_OV_FAULT | P17531_MFR_VAUX_FAULT))
+                               rc |= PB_VOLTAGE_OV_FAULT;
+                       if (mfr & P17531_MFR_UV_FAULT)
+                               rc |= PB_VOLTAGE_UV_FAULT;
+               } else if (reg == PMBUS_STATUS_IOUT) {
+                       if (mfr & P17531_MFR_OC_FAULT)
+                               rc |= PB_IOUT_OC_FAULT;
+                       if (mfr & P17531_MFR_CURRENT_SHARE_WARNING)
+                               rc |= PB_CURRENT_SHARE_FAULT;
+               }
+               break;
+       default:
+               if (reg >= PMBUS_VIRT_BASE)
+                       return -ENXIO;
+
+               rc = pmbus_read_byte_data(client, page, reg);
+               break;
+       }
+
+       return rc;
+}
+
+static int p17531_read_word_data(struct i2c_client *client, int page, int reg)
+{
+       int rc, mfr;
+
+       switch (reg) {
+       case PMBUS_STATUS_BYTE:
+       case PMBUS_STATUS_WORD:
+               rc = pmbus_read_word_data(client, page, PMBUS_STATUS_WORD);
+               if (rc < 0)
+                       return rc;
+
+               mfr = pmbus_read_byte_data(client, page,
+                                          PMBUS_STATUS_MFR_SPECIFIC);
+               if (mfr < 0)
+                       return rc;
+
+               if (mfr & P17531_MFR_PS_KILL)
+                       rc |= PB_STATUS_OFF;
+
+               if (mfr)
+                       rc |= PB_STATUS_WORD_MFR;
+               break;
+       default:
+               if (reg >= PMBUS_VIRT_BASE)
+                       return -ENXIO;
+
+               rc = pmbus_read_word_data(client, page, reg);
+               if (rc < 0)
+                       rc = p17531_read_byte_data(client, page, reg);
+               break;
+       }
+
+       return rc;
+}
+
+static struct pmbus_driver_info p17531_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 = p17531_read_byte_data,
+       .read_word_data = p17531_read_word_data,
+};
+
+static int p17531_probe(struct i2c_client *client,
+                       const struct i2c_device_id *id)
+{
+       return pmbus_do_probe(client, id, &p17531_info);
+}
+
+static int p17531_remove(struct i2c_client *client)
+{
+       return pmbus_do_remove(client);
+}
+
+enum chips { p17531 };
+
+static const struct i2c_device_id p17531_id[] = {
+       { "p17531", p17531 },
+       { }
+};
+MODULE_DEVICE_TABLE(i2c, p17531_id);
+
+static const struct of_device_id p17531_of_match[] = {
+       { .compatible = "ibm,p17531" },
+       {}
+};
+MODULE_DEVICE_TABLE(of, p8_i2c_occ_of_match);
+
+static struct i2c_driver p17531_driver = {
+       .driver = {
+               .name = "p17531",
+               .of_match_table = p17531_of_match,
+       },
+       .probe = p17531_probe,
+       .remove = p17531_remove,
+       .id_table = p17531_id,
+};
+
+module_i2c_driver(p17531_driver);
+
+MODULE_AUTHOR("Eddie James");
+MODULE_DESCRIPTION("PMBus driver for IBM P17531");
+MODULE_LICENSE("GPL");
--

1.8.3.1