hwmon: Add support for MAX6642

MAX6642 is a SMBus-Compatible Remote/Local Temperature Sensor with
Overtemperature Alarm from Maxim.

Signed-off-by: Per Dalen <per.dalen@appeartv.com>
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>

4 files changed, 389 insertions, 0 deletions

diff --git a/Documentation/hwmon/max6642 b/Documentation/hwmon/max6642
new file mode 100644
index 000000000000..afbd3e4942e2
--- /dev/null
+++ b/Documentation/hwmon/max6642
@@ -0,0 +1,21 @@
+Kernel driver max6642
+=====================
+
+Supported chips:
+  * Maxim MAX6642
+    Prefix: 'max6642'
+    Addresses scanned: I2C 0x48-0x4f
+    Datasheet: Publicly available at the Maxim website
+               http://datasheets.maxim-ic.com/en/ds/MAX6642.pdf
+
+Authors:
+        Per Dalen <per.dalen@appeartv.com>
+
+Description
+-----------
+
+The MAX6642 is a digital temperature sensor. It senses its own temperature as
+well as the temperature on one external diode.
+
+All temperature values are given in degrees Celsius. Resolution
+is 0.25 degree for the local temperature and for the remote temperature.
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 50e40dbd8bb6..f2d48777c508 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -727,6 +727,17 @@ config SENSORS_MAX6639
           This driver can also be built as a module.  If so, the module
           will be called max6639.
 
+config SENSORS_MAX6642
+        tristate "Maxim MAX6642 sensor chip"
+        depends on I2C && EXPERIMENTAL
+        help
+          If you say yes here you get support for MAX6642 sensor chip.
+          MAX6642 is a SMBus-Compatible Remote/Local Temperature Sensor
+          with Overtemperature Alarm from Maxim.
+
+          This driver can also be built as a module.  If so, the module
+          will be called max6642.
+
 config SENSORS_MAX6650
         tristate "Maxim MAX6650 sensor chip"
         depends on I2C && EXPERIMENTAL
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 967d0ea9447f..2211752d73b6 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -85,6 +85,7 @@ obj-$(CONFIG_SENSORS_LTC4261)	+= ltc4261.o
 obj-$(CONFIG_SENSORS_MAX1111)   += max1111.o
 obj-$(CONFIG_SENSORS_MAX1619)   += max1619.o
 obj-$(CONFIG_SENSORS_MAX6639)   += max6639.o
+obj-$(CONFIG_SENSORS_MAX6642)   += max6642.o
 obj-$(CONFIG_SENSORS_MAX6650)   += max6650.o
 obj-$(CONFIG_SENSORS_MC13783_ADC)+= mc13783-adc.o
 obj-$(CONFIG_SENSORS_PC87360)   += pc87360.o
diff --git a/drivers/hwmon/max6642.c b/drivers/hwmon/max6642.c
new file mode 100644
index 000000000000..0f9fc40379cd
--- /dev/null
+++ b/drivers/hwmon/max6642.c
@@ -0,0 +1,356 @@
+/*
+ * Driver for +/-1 degree C, SMBus-Compatible Remote/Local Temperature Sensor
+ * with Overtemperature Alarm
+ *
+ * Copyright (C) 2011 AppearTV AS
+ *
+ * Derived from:
+ *
+ *  Based on the max1619 driver.
+ *  Copyright (C) 2003-2004 Alexey Fisher <fishor@mail.ru>
+ *                          Jean Delvare <khali@linux-fr.org>
+ *
+ * The MAX6642 is a sensor chip made by Maxim.
+ * It reports up to two temperatures (its own plus up to
+ * one external one). Complete datasheet can be
+ * obtained from Maxim's website at:
+ *   http://datasheets.maxim-ic.com/en/ds/MAX6642.pdf
+ *
+ * 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/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/jiffies.h>
+#include <linux/i2c.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/err.h>
+#include <linux/mutex.h>
+#include <linux/sysfs.h>
+
+static const unsigned short normal_i2c[] = {
+        0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, I2C_CLIENT_END };
+
+/*
+ * The MAX6642 registers
+ */
+
+#define MAX6642_REG_R_MAN_ID            0xFE
+#define MAX6642_REG_R_CONFIG            0x03
+#define MAX6642_REG_W_CONFIG            0x09
+#define MAX6642_REG_R_STATUS            0x02
+#define MAX6642_REG_R_LOCAL_TEMP        0x00
+#define MAX6642_REG_R_LOCAL_TEMPL       0x11
+#define MAX6642_REG_R_LOCAL_HIGH        0x05
+#define MAX6642_REG_W_LOCAL_HIGH        0x0B
+#define MAX6642_REG_R_REMOTE_TEMP       0x01
+#define MAX6642_REG_R_REMOTE_TEMPL      0x10
+#define MAX6642_REG_R_REMOTE_HIGH       0x07
+#define MAX6642_REG_W_REMOTE_HIGH       0x0D
+
+/*
+ * Conversions
+ */
+
+static int temp_from_reg10(int val)
+{
+        return val * 250;
+}
+
+static int temp_from_reg(int val)
+{
+        return val * 1000;
+}
+
+static int temp_to_reg(int val)
+{
+        return val / 1000;
+}
+
+/*
+ * Client data (each client gets its own)
+ */
+
+struct max6642_data {
+        struct device *hwmon_dev;
+        struct mutex update_lock;
+        bool valid; /* zero until following fields are valid */
+        unsigned long last_updated; /* in jiffies */
+
+        /* registers values */
+        u16 temp_input[2]; /* local/remote */
+        u16 temp_high[2]; /* local/remote */
+        u8 alarms;
+};
+
+/*
+ * Real code
+ */
+
+static void max6642_init_client(struct i2c_client *client)
+{
+        u8 config;
+        struct max6642_data *data = i2c_get_clientdata(client);
+
+        /*
+         * Start the conversions.
+         */
+        config = i2c_smbus_read_byte_data(client, MAX6642_REG_R_CONFIG);
+        if (config & 0x40)
+                i2c_smbus_write_byte_data(client, MAX6642_REG_W_CONFIG,
+                                          config & 0xBF); /* run */
+
+        data->temp_high[0] = i2c_smbus_read_byte_data(client,
+                                MAX6642_REG_R_LOCAL_HIGH);
+        data->temp_high[1] = i2c_smbus_read_byte_data(client,
+                                MAX6642_REG_R_REMOTE_HIGH);
+}
+
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int max6642_detect(struct i2c_client *client,
+                          struct i2c_board_info *info)
+{
+        struct i2c_adapter *adapter = client->adapter;
+        u8 reg_config, reg_status, man_id;
+
+        if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+                return -ENODEV;
+
+        /* identification */
+        man_id = i2c_smbus_read_byte_data(client, MAX6642_REG_R_MAN_ID);
+        if (man_id != 0x4D)
+                return -ENODEV;
+
+        /*
+         * We read the config and status register, the 4 lower bits in the
+         * config register should be zero and bit 5, 3, 1 and 0 should be
+         * zero in the status register.
+         */
+        reg_config = i2c_smbus_read_byte_data(client, MAX6642_REG_R_CONFIG);
+        reg_status = i2c_smbus_read_byte_data(client, MAX6642_REG_R_STATUS);
+        if (((reg_config & 0x0f) != 0x00) ||
+            ((reg_status & 0x2b) != 0x00))
+                return -ENODEV;
+
+        strlcpy(info->type, "max6642", I2C_NAME_SIZE);
+
+        return 0;
+}
+
+static struct max6642_data *max6642_update_device(struct device *dev)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+        struct max6642_data *data = i2c_get_clientdata(client);
+        u16 val, tmp;
+
+        mutex_lock(&data->update_lock);
+
+        if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
+                dev_dbg(&client->dev, "Updating max6642 data.\n");
+                val = i2c_smbus_read_byte_data(client,
+                                        MAX6642_REG_R_LOCAL_TEMPL);
+                tmp = (val >> 6) & 3;
+                val = i2c_smbus_read_byte_data(client,
+                                        MAX6642_REG_R_LOCAL_TEMP);
+                val = (val << 2) | tmp;
+                data->temp_input[0] = val;
+                val = i2c_smbus_read_byte_data(client,
+                                        MAX6642_REG_R_REMOTE_TEMPL);
+                tmp = (val >> 6) & 3;
+                val = i2c_smbus_read_byte_data(client,
+                                        MAX6642_REG_R_REMOTE_TEMP);
+                val = (val << 2) | tmp;
+                data->temp_input[1] = val;
+                data->alarms = i2c_smbus_read_byte_data(client,
+                                        MAX6642_REG_R_STATUS);
+
+                data->last_updated = jiffies;
+                data->valid = 1;
+        }
+
+        mutex_unlock(&data->update_lock);
+
+        return data;
+}
+
+/*
+ * Sysfs stuff
+ */
+
+static ssize_t show_temp_max10(struct device *dev,
+                               struct device_attribute *dev_attr, char *buf)
+{
+        struct max6642_data *data = max6642_update_device(dev);
+        struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
+
+        return sprintf(buf, "%d\n",
+                       temp_from_reg10(data->temp_input[attr->index]));
+}
+
+static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr,
+                             char *buf)
+{
+        struct max6642_data *data = max6642_update_device(dev);
+        struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(attr);
+
+        return sprintf(buf, "%d\n", temp_from_reg(data->temp_high[attr2->nr]));
+}
+
+static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
+                            const char *buf, size_t count)
+{
+        unsigned long val;
+        int err;
+        struct i2c_client *client = to_i2c_client(dev);
+        struct max6642_data *data = i2c_get_clientdata(client);
+        struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(attr);
+
+        err = strict_strtoul(buf, 10, &val);
+        if (err < 0)
+                return err;
+
+        mutex_lock(&data->update_lock);
+        data->temp_high[attr2->nr] = SENSORS_LIMIT(temp_to_reg(val), 0, 255);
+        i2c_smbus_write_byte_data(client, attr2->index,
+                                  data->temp_high[attr2->nr]);
+        mutex_unlock(&data->update_lock);
+        return count;
+}
+
+static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
+                          char *buf)
+{
+        int bitnr = to_sensor_dev_attr(attr)->index;
+        struct max6642_data *data = max6642_update_device(dev);
+        return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
+}
+
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_max10, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_max10, NULL, 1);
+static SENSOR_DEVICE_ATTR_2(temp1_max, S_IWUSR | S_IRUGO, show_temp_max,
+                            set_temp_max, 0, MAX6642_REG_W_LOCAL_HIGH);
+static SENSOR_DEVICE_ATTR_2(temp2_max, S_IWUSR | S_IRUGO, show_temp_max,
+                            set_temp_max, 1, MAX6642_REG_W_REMOTE_HIGH);
+static SENSOR_DEVICE_ATTR(temp_fault, S_IRUGO, show_alarm, NULL, 2);
+static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6);
+static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4);
+
+static struct attribute *max6642_attributes[] = {
+        &sensor_dev_attr_temp1_input.dev_attr.attr,
+        &sensor_dev_attr_temp2_input.dev_attr.attr,
+        &sensor_dev_attr_temp1_max.dev_attr.attr,
+        &sensor_dev_attr_temp2_max.dev_attr.attr,
+
+        &sensor_dev_attr_temp_fault.dev_attr.attr,
+        &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
+        &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
+        NULL
+};
+
+static const struct attribute_group max6642_group = {
+        .attrs = max6642_attributes,
+};
+
+static int max6642_probe(struct i2c_client *new_client,
+                         const struct i2c_device_id *id)
+{
+        struct max6642_data *data;
+        int err;
+
+        data = kzalloc(sizeof(struct max6642_data), GFP_KERNEL);
+        if (!data) {
+                err = -ENOMEM;
+                goto exit;
+        }
+
+        i2c_set_clientdata(new_client, data);
+        mutex_init(&data->update_lock);
+
+        /* Initialize the MAX6642 chip */
+        max6642_init_client(new_client);
+
+        /* Register sysfs hooks */
+        err = sysfs_create_group(&new_client->dev.kobj, &max6642_group);
+        if (err)
+                goto exit_free;
+
+        data->hwmon_dev = hwmon_device_register(&new_client->dev);
+        if (IS_ERR(data->hwmon_dev)) {
+                err = PTR_ERR(data->hwmon_dev);
+                goto exit_remove_files;
+        }
+
+        return 0;
+
+exit_remove_files:
+        sysfs_remove_group(&new_client->dev.kobj, &max6642_group);
+exit_free:
+        kfree(data);
+exit:
+        return err;
+}
+
+static int max6642_remove(struct i2c_client *client)
+{
+        struct max6642_data *data = i2c_get_clientdata(client);
+
+        hwmon_device_unregister(data->hwmon_dev);
+        sysfs_remove_group(&client->dev.kobj, &max6642_group);
+
+        kfree(data);
+        return 0;
+}
+
+/*
+ * Driver data (common to all clients)
+ */
+
+static const struct i2c_device_id max6642_id[] = {
+        { "max6642", 0 },
+        { }
+};
+MODULE_DEVICE_TABLE(i2c, max6642_id);
+
+static struct i2c_driver max6642_driver = {
+        .class          = I2C_CLASS_HWMON,
+        .driver = {
+                .name   = "max6642",
+        },
+        .probe          = max6642_probe,
+        .remove         = max6642_remove,
+        .id_table       = max6642_id,
+        .detect         = max6642_detect,
+        .address_list   = normal_i2c,
+};
+
+static int __init max6642_init(void)
+{
+        return i2c_add_driver(&max6642_driver);
+}
+
+static void __exit max6642_exit(void)
+{
+        i2c_del_driver(&max6642_driver);
+}
+
+MODULE_AUTHOR("Per Dalen <per.dalen@appeartv.com>");
+MODULE_DESCRIPTION("MAX6642 sensor driver");
+MODULE_LICENSE("GPL");
+
+module_init(max6642_init);
+module_exit(max6642_exit);