hwmon: (pmbus) Add support for Maxim MAX34440/MAX34441

Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>

3 files changed, 210 insertions, 0 deletions

diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index de91d7d6a38e..19b0af40c7aa 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -789,6 +789,16 @@ config SENSORS_MAX16064
           This driver can also be built as a module. If so, the module will
           be called max16064.
 
+config SENSORS_MAX34440
+        tristate "Maxim MAX34440/MAX34441"
+        default n
+        help
+          If you say yes here you get hardware monitoring support for Maxim
+          MAX34440 and MAX34441.
+
+          This driver can also be built as a module. If so, the module will
+          be called max34440.
+
 config SENSORS_MAX8688
         tristate "Maxim MAX8688"
         default n
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 9788fe248c68..feacc7c243ce 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -118,6 +118,7 @@ obj-$(CONFIG_SENSORS_WM8350)	+= wm8350-hwmon.o
 obj-$(CONFIG_PMBUS)             += pmbus_core.o
 obj-$(CONFIG_SENSORS_PMBUS)     += pmbus.o
 obj-$(CONFIG_SENSORS_MAX16064)  += max16064.o
+obj-$(CONFIG_SENSORS_MAX34440)  += max34440.o
 obj-$(CONFIG_SENSORS_MAX8688)   += max8688.o
 
 ifeq ($(CONFIG_HWMON_DEBUG_CHIP),y)
diff --git a/drivers/hwmon/max34440.c b/drivers/hwmon/max34440.c
new file mode 100644
index 000000000000..992b701b4c5e
--- /dev/null
+++ b/drivers/hwmon/max34440.c
@@ -0,0 +1,199 @@
+/*
+ * Hardware monitoring driver for Maxim MAX34440/MAX34441
+ *
+ * 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/i2c.h>
+#include "pmbus.h"
+
+enum chips { max34440, max34441 };
+
+#define MAX34440_STATUS_OC_WARN         (1 << 0)
+#define MAX34440_STATUS_OC_FAULT        (1 << 1)
+#define MAX34440_STATUS_OT_FAULT        (1 << 5)
+#define MAX34440_STATUS_OT_WARN         (1 << 6)
+
+static int max34440_get_status(struct i2c_client *client, int page, int reg)
+{
+        int ret;
+        int mfg_status;
+
+        ret = pmbus_set_page(client, page);
+        if (ret < 0)
+                return ret;
+
+        switch (reg) {
+        case PMBUS_STATUS_IOUT:
+                mfg_status = pmbus_read_word_data(client, 0,
+                                                  PMBUS_STATUS_MFR_SPECIFIC);
+                if (mfg_status < 0)
+                        return mfg_status;
+                if (mfg_status & MAX34440_STATUS_OC_WARN)
+                        ret |= PB_IOUT_OC_WARNING;
+                if (mfg_status & MAX34440_STATUS_OC_FAULT)
+                        ret |= PB_IOUT_OC_FAULT;
+                break;
+        case PMBUS_STATUS_TEMPERATURE:
+                mfg_status = pmbus_read_word_data(client, 0,
+                                                  PMBUS_STATUS_MFR_SPECIFIC);
+                if (mfg_status < 0)
+                        return mfg_status;
+                if (mfg_status & MAX34440_STATUS_OT_WARN)
+                        ret |= PB_TEMP_OT_WARNING;
+                if (mfg_status & MAX34440_STATUS_OT_FAULT)
+                        ret |= PB_TEMP_OT_FAULT;
+                break;
+        default:
+                ret = -ENODATA;
+                break;
+        }
+        return ret;
+}
+
+static struct pmbus_driver_info max34440_info[] = {
+        [max34440] = {
+                .pages = 14,
+                .direct[PSC_VOLTAGE_IN] = true,
+                .direct[PSC_VOLTAGE_OUT] = true,
+                .direct[PSC_TEMPERATURE] = true,
+                .direct[PSC_CURRENT_OUT] = true,
+                .m[PSC_VOLTAGE_IN] = 1,
+                .b[PSC_VOLTAGE_IN] = 0,
+                .R[PSC_VOLTAGE_IN] = 3,     /* R = 0 in datasheet reflects mV */
+                .m[PSC_VOLTAGE_OUT] = 1,
+                .b[PSC_VOLTAGE_OUT] = 0,
+                .R[PSC_VOLTAGE_OUT] = 3,    /* R = 0 in datasheet reflects mV */
+                .m[PSC_CURRENT_OUT] = 1,
+                .b[PSC_CURRENT_OUT] = 0,
+                .R[PSC_CURRENT_OUT] = 3,    /* R = 0 in datasheet reflects mA */
+                .m[PSC_TEMPERATURE] = 1,
+                .b[PSC_TEMPERATURE] = 0,
+                .R[PSC_TEMPERATURE] = 2,
+                .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+                  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
+                .func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+                  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
+                .func[2] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+                  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
+                .func[3] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+                  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
+                .func[4] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+                  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
+                .func[5] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+                  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
+                .func[6] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+                .func[7] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+                .func[8] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+                .func[9] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+                .func[10] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+                .func[11] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+                .func[12] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+                .func[13] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+                .get_status = max34440_get_status,
+        },
+        [max34441] = {
+                .pages = 12,
+                .direct[PSC_VOLTAGE_IN] = true,
+                .direct[PSC_VOLTAGE_OUT] = true,
+                .direct[PSC_TEMPERATURE] = true,
+                .direct[PSC_CURRENT_OUT] = true,
+                .direct[PSC_FAN] = true,
+                .m[PSC_VOLTAGE_IN] = 1,
+                .b[PSC_VOLTAGE_IN] = 0,
+                .R[PSC_VOLTAGE_IN] = 3,
+                .m[PSC_VOLTAGE_OUT] = 1,
+                .b[PSC_VOLTAGE_OUT] = 0,
+                .R[PSC_VOLTAGE_OUT] = 3,
+                .m[PSC_CURRENT_OUT] = 1,
+                .b[PSC_CURRENT_OUT] = 0,
+                .R[PSC_CURRENT_OUT] = 3,
+                .m[PSC_TEMPERATURE] = 1,
+                .b[PSC_TEMPERATURE] = 0,
+                .R[PSC_TEMPERATURE] = 2,
+                .m[PSC_FAN] = 1,
+                .b[PSC_FAN] = 0,
+                .R[PSC_FAN] = 0,
+                .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+                  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
+                .func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+                  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
+                .func[2] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+                  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
+                .func[3] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+                  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
+                .func[4] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+                  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
+                .func[5] = PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12,
+                .func[6] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+                .func[7] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+                .func[8] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+                .func[9] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+                .func[10] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+                .func[11] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+                .get_status = max34440_get_status,
+        },
+};
+
+static int max34440_probe(struct i2c_client *client,
+                          const struct i2c_device_id *id)
+{
+        return pmbus_do_probe(client, id, &max34440_info[id->driver_data]);
+}
+
+static int max34440_remove(struct i2c_client *client)
+{
+        return pmbus_do_remove(client);
+}
+
+static const struct i2c_device_id max34440_id[] = {
+        {"max34440", max34440},
+        {"max34441", max34441},
+        {}
+};
+
+MODULE_DEVICE_TABLE(i2c, max34440_id);
+
+/* This is the driver that will be inserted */
+static struct i2c_driver max34440_driver = {
+        .driver = {
+                   .name = "max34440",
+                   },
+        .probe = max34440_probe,
+        .remove = max34440_remove,
+        .id_table = max34440_id,
+};
+
+static int __init max34440_init(void)
+{
+        return i2c_add_driver(&max34440_driver);
+}
+
+static void __exit max34440_exit(void)
+{
+        i2c_del_driver(&max34440_driver);
+}
+
+MODULE_AUTHOR("Guenter Roeck");
+MODULE_DESCRIPTION("PMBus driver for Maxim MAX34440/MAX34441");
+MODULE_LICENSE("GPL");
+module_init(max34440_init);
+module_exit(max34440_exit);