hwmon: (pmbus) Add client driver for LM25066, LM5064, and LM5066

PMBus client driver supporting National Semiconductor LM25066, LM5064, and LM5066.

Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Reviewed-by: Robert Coulson <robert.coulson@ericsson.com>

6 files changed, 444 insertions, 1 deletions

diff --git a/Documentation/hwmon/lm25066 b/Documentation/hwmon/lm25066
new file mode 100644
index 000000000000..a21db81c4591
--- /dev/null
+++ b/Documentation/hwmon/lm25066
@@ -0,0 +1,90 @@
+Kernel driver max8688
+=====================
+
+Supported chips:
+  * National Semiconductor LM25066
+    Prefix: 'lm25066'
+    Addresses scanned: -
+    Datasheets:
+        http://www.national.com/pf/LM/LM25066.html
+        http://www.national.com/pf/LM/LM25066A.html
+  * National Semiconductor LM5064
+    Prefix: 'lm5064'
+    Addresses scanned: -
+    Datasheet:
+        http://www.national.com/pf/LM/LM5064.html
+  * National Semiconductor LM5066
+    Prefix: 'lm5066'
+    Addresses scanned: -
+    Datasheet:
+        http://www.national.com/pf/LM/LM5066.html
+
+Author: Guenter Roeck <guenter.roeck@ericsson.com>
+
+
+Description
+-----------
+
+This driver supports hardware montoring for National Semiconductor LM25066,
+LM5064, and LM5064 Power Management, Monitoring, Control, and Protection ICs.
+
+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. Limits are read-write; all other
+attributes are read-only.
+
+in1_label               "vin"
+in1_input               Measured input voltage.
+in1_average             Average measured input voltage.
+in1_min                 Minimum input voltage.
+in1_max                 Maximum input voltage.
+in1_min_alarm           Input voltage low alarm.
+in1_max_alarm           Input voltage high alarm.
+
+in2_label               "vout1"
+in2_input               Measured output voltage.
+in2_average             Average measured output voltage.
+in2_min                 Minimum output voltage.
+in2_min_alarm           Output voltage low alarm.
+
+in3_label               "vout2"
+in3_input               Measured voltage on vaux pin
+
+curr1_label             "iin"
+curr1_input             Measured input current.
+curr1_average           Average measured input current.
+curr1_max               Maximum input current.
+curr1_max_alarm         Input current high alarm.
+
+power1_label            "pin"
+power1_input            Measured input power.
+power1_average          Average measured input power.
+power1_max              Maximum input power limit.
+power1_alarm            Input power alarm
+power1_input_highest    Historical maximum power.
+power1_reset_history    Write any value to reset maximum power history.
+
+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.
diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index 0a822a45085d..c9237b9dcff2 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -35,6 +35,16 @@ config SENSORS_ADM1275
           This driver can also be built as a module. If so, the module will
           be called adm1275.
 
+config SENSORS_LM25066
+        tristate "National Semiconductor LM25066 and compatibles"
+        default n
+        help
+          If you say yes here you get hardware monitoring support for National
+          Semiconductor LM25066, LM5064, and LM5066.
+
+          This driver can also be built as a module. If so, the module will
+          be called lm25066.
+
 config SENSORS_MAX16064
         tristate "Maxim MAX16064"
         default n
diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
index 0178f81829d0..623eedb1ed9a 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_LM25066)   += lm25066.o
 obj-$(CONFIG_SENSORS_MAX16064)  += max16064.o
 obj-$(CONFIG_SENSORS_MAX34440)  += max34440.o
 obj-$(CONFIG_SENSORS_MAX8688)   += max8688.o
diff --git a/drivers/hwmon/pmbus/lm25066.c b/drivers/hwmon/pmbus/lm25066.c
new file mode 100644
index 000000000000..d4bc114572de
--- /dev/null
+++ b/drivers/hwmon/pmbus/lm25066.c
@@ -0,0 +1,340 @@
+/*
+ * Hardware monitoring driver for LM25066 / LM5064 / LM5066
+ *
+ * Copyright (c) 2011 Ericsson AB.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include "pmbus.h"
+
+enum chips { lm25066, lm5064, lm5066 };
+
+#define LM25066_READ_VAUX               0xd0
+#define LM25066_MFR_READ_IIN            0xd1
+#define LM25066_MFR_READ_PIN            0xd2
+#define LM25066_MFR_IIN_OC_WARN_LIMIT   0xd3
+#define LM25066_MFR_PIN_OP_WARN_LIMIT   0xd4
+#define LM25066_READ_PIN_PEAK           0xd5
+#define LM25066_CLEAR_PIN_PEAK          0xd6
+#define LM25066_DEVICE_SETUP            0xd9
+#define LM25066_READ_AVG_VIN            0xdc
+#define LM25066_READ_AVG_VOUT           0xdd
+#define LM25066_READ_AVG_IIN            0xde
+#define LM25066_READ_AVG_PIN            0xdf
+
+#define LM25066_DEV_SETUP_CL            (1 << 4)        /* Current limit */
+
+struct lm25066_data {
+        int id;
+        struct pmbus_driver_info info;
+};
+
+#define to_lm25066_data(x)  container_of(x, struct lm25066_data, info)
+
+static int lm25066_read_word_data(struct i2c_client *client, int page, int reg)
+{
+        const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+        const struct lm25066_data *data = to_lm25066_data(info);
+        int ret;
+
+        if (page > 1)
+                return -EINVAL;
+
+        /* Map READ_VAUX into READ_VOUT register on page 1 */
+        if (page == 1) {