hwmon: (pmbus) Add support for MAX20751

MAX20751 is a multiphase power controller with internal buck converter.
It uses VR12.0 to report the output voltage. This requires an explicit
driver, since the VR version can not be auto-detected.

The chip supports a manufacturer specific command to fine-tune the output
voltage.  This command is not currently supported.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/Documentation/hwmon/max20751 b/Documentation/hwmon/max20751
new file mode 100644 (file)
index 0000000..f9fa25e
--- /dev/null
+++ b/Documentation/hwmon/max20751
@@ -0,0 +1,77 @@
+Kernel driver max20751
+======================
+
+Supported chips:
+  * maxim MAX20751
+    Prefix: 'max20751'
+    Addresses scanned: -
+    Datasheet: http://datasheets.maximintegrated.com/en/ds/MAX20751.pdf
+    Application note: http://pdfserv.maximintegrated.com/en/an/AN5941.pdf
+
+Author: Guenter Roeck <linux@roeck-us.net>
+
+
+Description
+-----------
+
+This driver supports MAX20751 Multiphase Master with PMBus Interface
+and Internal Buck Converter.
+
+The driver is a client driver to the core PMBus driver.
+Please see Documentation/hwmon/pmbus for details on PMBus client drivers.
+
+
+Usage Notes
+-----------
+
+This driver does not auto-detect devices. You will have to instantiate the
+devices explicitly. Please see Documentation/i2c/instantiating-devices for
+details.
+
+
+Platform data support
+---------------------
+
+The driver supports standard PMBus driver platform data.
+
+
+Sysfs entries
+-------------
+
+The following attributes are supported.
+
+in1_label              "vin1"
+in1_input              Measured voltage.
+in1_min                        Minimum input voltage.
+in1_max                        Maximum input voltage.
+in1_lcrit              Critical minimum input voltage.
+in1_crit               Critical maximum input voltage.
+in1_min_alarm          Input voltage low alarm.
+in1_lcrit_alarm                Input voltage critical low alarm.
+in1_min_alarm          Input voltage low alarm.
+in1_max_alarm          Input voltage high alarm.
+
+in2_label              "vout1"
+in2_input              Measured voltage.
+in2_min                        Minimum output voltage.
+in2_max                        Maximum output voltage.
+in2_lcrit              Critical minimum output voltage.
+in2_crit               Critical maximum output voltage.
+in2_min_alarm          Output voltage low alarm.
+in2_lcrit_alarm                Output voltage critical low alarm.
+in2_min_alarm          Output voltage low alarm.
+in2_max_alarm          Output voltage high alarm.
+
+curr1_input            Measured output current.
+curr1_label            "iout1"
+curr1_max              Maximum output current.
+curr1_alarm            Current high alarm.
+
+temp1_input            Measured temperature.
+temp1_max              Maximum temperature.
+temp1_crit             Critical high temperature.
+temp1_max_alarm                Chip temperature high alarm.
+temp1_crit_alarm       Chip temperature critical high alarm.
+
+power1_input           Output power.
+power1_label           "pout1"

diff --git a/MAINTAINERS b/MAINTAINERS
index a9ae6c1..6a406b6 100644 (file)
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6539,6 +6539,13 @@ S:       Maintained
 F:     Documentation/hwmon/max16065
 F:     drivers/hwmon/max16065.c
 
+MAX20751 HARDWARE MONITOR DRIVER
+M:     Guenter Roeck <linux@roeck-us.net>
+L:     lm-sensors@lm-sensors.org
+S:     Maintained
+F:     Documentation/hwmon/max20751
+F:     drivers/hwmon/max20751.c
+
 MAX6650 HARDWARE MONITOR AND FAN CONTROLLER DRIVER
 M:     "Hans J. Koch" <hjk@hansjkoch.de>
 L:     lm-sensors@lm-sensors.org

diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index 67901cb..6e1e6fe 100644 (file)
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -73,6 +73,16 @@ config SENSORS_MAX16064
          This driver can also be built as a module. If so, the module will
          be called max16064.
 
+config SENSORS_MAX20751
+       tristate "Maxim MAX20751"
+       default n
+       help
+         If you say yes here you get hardware monitoring support for Maxim
+         MAX20751.
+
+         This driver can also be built as a module. If so, the module will
+         be called max20751.
+
 config SENSORS_MAX34440
        tristate "Maxim MAX34440 and compatibles"
        default n

diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
index 1454293..bce046d 100644 (file)
--- a/drivers/hwmon/pmbus/Makefile
+++ b/drivers/hwmon/pmbus/Makefile
@@ -8,6 +8,7 @@ obj-$(CONFIG_SENSORS_ADM1275)   += adm1275.o
 obj-$(CONFIG_SENSORS_LM25066)  += lm25066.o
 obj-$(CONFIG_SENSORS_LTC2978)  += ltc2978.o
 obj-$(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_TPS40422) += tps40422.o

diff --git a/drivers/hwmon/pmbus/max20751.c b/drivers/hwmon/pmbus/max20751.c
new file mode 100644 (file)
index 0000000..ab74aea
--- /dev/null
+++ b/drivers/hwmon/pmbus/max20751.c
@@ -0,0 +1,64 @@
+/*
+ * Hardware monitoring driver for Maxim MAX20751
+ *
+ * Copyright (c) 2015 Guenter Roeck
+ *
+ * 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/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include "pmbus.h"
+
+static struct pmbus_driver_info max20751_info = {
+       .pages = 1,
+       .format[PSC_VOLTAGE_IN] = linear,
+       .format[PSC_VOLTAGE_OUT] = vid,
+       .vrm_version = vr12,
+       .format[PSC_TEMPERATURE] = linear,
+       .format[PSC_CURRENT_OUT] = linear,
+       .format[PSC_POWER] = linear,
+       .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
+               PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
+               PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
+               PMBUS_HAVE_POUT,
+};
+
+static int max20751_probe(struct i2c_client *client,
+                         const struct i2c_device_id *id)
+{
+       return pmbus_do_probe(client, id, &max20751_info);
+}
+
+static const struct i2c_device_id max20751_id[] = {
+       {"max20751", 0},
+       {}
+};
+
+MODULE_DEVICE_TABLE(i2c, max20751_id);
+
+static struct i2c_driver max20751_driver = {
+       .driver = {
+                  .name = "max20751",
+                  },
+       .probe = max20751_probe,
+       .remove = pmbus_do_remove,
+       .id_table = max20751_id,
+};
+
+module_i2c_driver(max20751_driver);
+
+MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
+MODULE_DESCRIPTION("PMBus driver for Maxim MAX20751");
+MODULE_LICENSE("GPL");