hwmon: (pmbus) Add support for Maxim MAX8688

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

3 files changed, 169 insertions, 0 deletions

diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index ac116693e357..521f191fcbe3 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -779,6 +779,16 @@ config SENSORS_PMBUS
           This driver can also be built as a module. If so, the module will
           be called pmbus.
 
+config SENSORS_MAX8688
+        tristate "Maxim MAX8688"
+        default n
+        help
+          If you say yes here you get hardware monitoring support for Maxim
+          MAX8688.
+
+          This driver can also be built as a module. If so, the module will
+          be called max8688.
+
 endif # PMBUS
 
 config SENSORS_SHT15
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 09e67955fd57..0e7cf92d1b56 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -117,6 +117,7 @@ obj-$(CONFIG_SENSORS_WM8350)	+= wm8350-hwmon.o
 # PMBus drivers
 obj-$(CONFIG_PMBUS)             += pmbus_core.o
 obj-$(CONFIG_SENSORS_PMBUS)     += pmbus.o
+obj-$(CONFIG_SENSORS_MAX8688)   += max8688.o
 
 ifeq ($(CONFIG_HWMON_DEBUG_CHIP),y)
 EXTRA_CFLAGS += -DDEBUG
diff --git a/drivers/hwmon/max8688.c b/drivers/hwmon/max8688.c
new file mode 100644
index 000000000000..8ebfef2ecf26
--- /dev/null
+++ b/drivers/hwmon/max8688.c
@@ -0,0 +1,158 @@
+/*
+ * Hardware monitoring driver for Maxim MAX8688
+ *
+ * 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"
+
+#define MAX8688_MFG_STATUS              0xd8
+
+#define MAX8688_STATUS_OC_FAULT         (1 << 4)
+#define MAX8688_STATUS_OV_FAULT         (1 << 5)
+#define MAX8688_STATUS_OV_WARNING       (1 << 8)
+#define MAX8688_STATUS_UV_FAULT         (1 << 9)
+#define MAX8688_STATUS_UV_WARNING       (1 << 10)
+#define MAX8688_STATUS_UC_FAULT         (1 << 11)
+#define MAX8688_STATUS_OC_WARNING       (1 << 12)
+#define MAX8688_STATUS_OT_FAULT         (1 << 13)
+#define MAX8688_STATUS_OT_WARNING       (1 << 14)
+
+static int max8688_get_status(struct i2c_client *client, int page, int reg)
+{
+        int ret = 0;
+        int mfg_status;
+
+        if (page)
+                return -EINVAL;
+
+        switch (reg) {
+        case PMBUS_STATUS_VOUT:
+                mfg_status = pmbus_read_word_data(client, 0,
+                                                  MAX8688_MFG_STATUS);
+                if (mfg_status < 0)
+                        return mfg_status;
+                if (mfg_status & MAX8688_STATUS_UV_WARNING)
+                        ret |= PB_VOLTAGE_UV_WARNING;
+                if (mfg_status & MAX8688_STATUS_UV_FAULT)
+                        ret |= PB_VOLTAGE_UV_FAULT;
+                if (mfg_status & MAX8688_STATUS_OV_WARNING)
+                        ret |= PB_VOLTAGE_OV_WARNING;
+                if (mfg_status & MAX8688_STATUS_OV_FAULT)
+                        ret |= PB_VOLTAGE_OV_FAULT;
+                break;
+        case PMBUS_STATUS_IOUT:
+                mfg_status = pmbus_read_word_data(client, 0,
+                                                  MAX8688_MFG_STATUS);
+                if (mfg_status < 0)
+                        return mfg_status;
+                if (mfg_status & MAX8688_STATUS_UC_FAULT)
+                        ret |= PB_IOUT_UC_FAULT;
+                if (mfg_status & MAX8688_STATUS_OC_WARNING)
+                        ret |= PB_IOUT_OC_WARNING;
+                if (mfg_status & MAX8688_STATUS_OC_FAULT)
+                        ret |= PB_IOUT_OC_FAULT;
+                break;
+        case PMBUS_STATUS_TEMPERATURE:
+                mfg_status = pmbus_read_word_data(client, 0,
+                                                  MAX8688_MFG_STATUS);
+                if (mfg_status < 0)
+                        return mfg_status;
+                if (mfg_status & MAX8688_STATUS_OT_WARNING)
+                        ret |= PB_TEMP_OT_WARNING;
+                if (mfg_status & MAX8688_STATUS_OT_FAULT)
+                        ret |= PB_TEMP_OT_FAULT;
+                break;
+        default:
+                ret = -ENODATA;
+                break;
+        }
+        return ret;
+}
+
+static struct pmbus_driver_info max8688_info = {
+        .pages = 1,
+        .direct[PSC_VOLTAGE_IN] = true,
+        .direct[PSC_VOLTAGE_OUT] = true,
+        .direct[PSC_TEMPERATURE] = true,
+        .direct[PSC_CURRENT_OUT] = true,
+        .m[PSC_VOLTAGE_IN] = 19995,
+        .b[PSC_VOLTAGE_IN] = 0,
+        .R[PSC_VOLTAGE_IN] = -1,
+        .m[PSC_VOLTAGE_OUT] = 19995,
+        .b[PSC_VOLTAGE_OUT] = 0,
+        .R[PSC_VOLTAGE_OUT] = -1,
+        .m[PSC_CURRENT_OUT] = 23109,
+        .b[PSC_CURRENT_OUT] = 0,
+        .R[PSC_CURRENT_OUT] = -2,
+        .m[PSC_TEMPERATURE] = -7612,
+        .b[PSC_TEMPERATURE] = 335,
+        .R[PSC_TEMPERATURE] = -3,
+        .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | PMBUS_HAVE_TEMP
+                | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT
+                | PMBUS_HAVE_STATUS_TEMP,
+        .get_status = max8688_get_status,
+};
+
+static int max8688_probe(struct i2c_client *client,
+                         const struct i2c_device_id *id)
+{
+        return pmbus_do_probe(client, id, &max8688_info);
+}
+
+static int max8688_remove(struct i2c_client *client)
+{
+        return pmbus_do_remove(client);
+}
+
+static const struct i2c_device_id max8688_id[] = {
+        {"max8688", 0},
+        { }
+};
+
+MODULE_DEVICE_TABLE(i2c, max8688_id);
+
+/* This is the driver that will be inserted */
+static struct i2c_driver max8688_driver = {
+        .driver = {
+                   .name = "max8688",
+                   },
+        .probe = max8688_probe,
+        .remove = max8688_remove,
+        .id_table = max8688_id,
+};
+
+static int __init max8688_init(void)
+{
+        return i2c_add_driver(&max8688_driver);
+}
+
+static void __exit max8688_exit(void)
+{
+        i2c_del_driver(&max8688_driver);
+}
+
+MODULE_AUTHOR("Guenter Roeck");
+MODULE_DESCRIPTION("PMBus driver for Maxim MAX8688");
+MODULE_LICENSE("GPL");
+module_init(max8688_init);
+module_exit(max8688_exit);