3 files changed, 355 insertions, 0 deletions

diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index fa609586c7c9..6dddad81281e 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -750,6 +750,16 @@ config SENSORS_DME1737
           This driver can also be built as a module.  If so, the module
           will be called dme1737.
 
+config SENSORS_EMC1403
+        tristate "SMSC EMC1403 thermal sensor"
+        depends on I2C
+        help
+          If you say yes here you get support for the SMSC EMC1403
+          temperature monitoring chip.
+
+          Threshold values can be configured using sysfs.
+          Data from the different diodes are accessible via sysfs.
+
 config SENSORS_SMSC47M1
         tristate "SMSC LPC47M10x and compatibles"
         help
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 86920fb34118..9b1364a4bd85 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -41,6 +41,7 @@ obj-$(CONFIG_SENSORS_ATXP1)	+= atxp1.o
 obj-$(CONFIG_SENSORS_CORETEMP)  += coretemp.o
 obj-$(CONFIG_SENSORS_DME1737)   += dme1737.o
 obj-$(CONFIG_SENSORS_DS1621)    += ds1621.o
+obj-$(CONFIG_SENSORS_EMC1403)   += emc1403.o
 obj-$(CONFIG_SENSORS_F71805F)   += f71805f.o
 obj-$(CONFIG_SENSORS_F71882FG)  += f71882fg.o
 obj-$(CONFIG_SENSORS_F75375S)   += f75375s.o
diff --git a/drivers/hwmon/emc1403.c b/drivers/hwmon/emc1403.c
new file mode 100644
index 000000000000..0e4b5642638d
--- /dev/null
+++ b/drivers/hwmon/emc1403.c
@@ -0,0 +1,344 @@
+/*
+ * emc1403.c - SMSC Thermal Driver
+ *
+ * Copyright (C) 2008 Intel Corp
+ *
+ *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * 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; version 2 of the License.
+ *
+ * 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.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * TODO
+ *      -       cache alarm and critical limit registers
+ *      -       add emc1404 support
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/err.h>
+#include <linux/sysfs.h>
+#include <linux/mutex.h>
+
+#define THERMAL_PID_REG         0xfd
+#define THERMAL_SMSC_ID_REG     0xfe
+#define THERMAL_REVISION_REG    0xff
+
+struct thermal_data {
+        struct device *hwmon_dev;
+        struct mutex mutex;
+        /* Cache the hyst value so we don't keep re-reading it. In theory
+           we could cache it forever as nobody else should be writing it. */
+        u8 cached_hyst;
+        unsigned long hyst_valid;
+};
+
+static ssize_t show_temp(struct device *dev,
+                        struct device_attribute *attr, char *buf)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+        struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
+        int retval = i2c_smbus_read_byte_data(client, sda->index);
+
+        if (retval < 0)
+                return retval;
+        return sprintf(buf, "%d000\n", retval);
+}
+
+static ssize_t show_bit(struct device *dev,
+                        struct device_attribute *attr, char *buf)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+        struct sensor_device_attribute_2 *sda = to_sensor_dev_attr_2(attr);
+        int retval = i2c_smbus_read_byte_data(client, sda->nr);
+
+        if (retval < 0)
+                return retval;
+        retval &= sda->index;
+        return sprintf(buf, "%d\n", retval ? 1 : 0);
+}
+
+static ssize_t store_temp(struct device *dev,
+                struct device_attribute *attr, const char *buf, size_t count)
+{
+        struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
+        struct i2c_client *client = to_i2c_client(dev);
+        unsigned long val;
+        int retval;
+
+        if (strict_strtoul(buf, 10, &val))
+                return -EINVAL;
+        retval = i2c_smbus_write_byte_data(client, sda->index,
+                                        DIV_ROUND_CLOSEST(val, 1000));
+        if (retval < 0)
+                return retval;
+        return count;
+}
+
+static ssize_t show_hyst(struct device *dev,
+                        struct device_attribute *attr, char *buf)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+        struct thermal_data *data = i2c_get_clientdata(client);
+        struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
+        int retval;
+        int hyst;
+
+        retval = i2c_smbus_read_byte_data(client, sda->index);
+        if (retval < 0)
+                return retval;
+
+        if (time_after(jiffies, data->hyst_valid)) {
+                hyst = i2c_smbus_read_byte_data(client, 0x21);
+                if (hyst < 0)
+                        return retval;
+                data->cached_hyst = hyst;
+                data->hyst_valid = jiffies + HZ;
+        }
+        return sprintf(buf, "%d000\n", retval - data->cached_hyst);
+}
+
+static ssize_t store_hyst(struct device *dev,
+                struct device_attribute *attr, const char *buf, size_t count)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+        struct thermal_data *data = i2c_get_clientdata(client);
+        struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
+        int retval;
+        int hyst;
+        unsigned long val;
+
+        if (strict_strtoul(buf, 10, &val))
+                return -EINVAL;
+
+        mutex_lock(&data->mutex);
+        retval = i2c_smbus_read_byte_data(client, sda->index);
+        if (retval < 0)
+                goto fail;
+
+        hyst = val - retval * 1000;
+        hyst = DIV_ROUND_CLOSEST(hyst, 1000);
+        if (hyst < 0 || hyst > 255) {
+                retval = -ERANGE;
+                goto fail;
+        }
+
+        retval = i2c_smbus_write_byte_data(client, 0x21, hyst);
+        if (retval == 0) {
+                retval = count;
+                data->cached_hyst = hyst;
+                data->hyst_valid = jiffies + HZ;
+        }
+fail:
+        mutex_unlock(&data->mutex);
+        return retval;
+}
+
+/*
+ *      Sensors. We pass the actual i2c register to the methods.
+ */
+
+static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO | S_IWUSR,
+        show_temp, store_temp, 0x06);
+static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR,
+        show_temp, store_temp, 0x05);
+static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO | S_IWUSR,
+        show_temp, store_temp, 0x20);
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0x00);
+static SENSOR_DEVICE_ATTR_2(temp1_min_alarm, S_IRUGO,
+        show_bit, NULL, 0x36, 0x01);
+static SENSOR_DEVICE_ATTR_2(temp1_max_alarm, S_IRUGO,
+        show_bit, NULL, 0x35, 0x01);
+static SENSOR_DEVICE_ATTR_2(temp1_crit_alarm, S_IRUGO,
+        show_bit, NULL, 0x37, 0x01);
+static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO | S_IWUSR,
+        show_hyst, store_hyst, 0x20);
+
+static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO | S_IWUSR,
+        show_temp, store_temp, 0x08);
+static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO | S_IWUSR,
+        show_temp, store_temp, 0x07);
+static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO | S_IWUSR,
+        show_temp, store_temp, 0x19);
+static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 0x01);
+static SENSOR_DEVICE_ATTR_2(temp2_min_alarm, S_IRUGO,
+        show_bit, NULL, 0x36, 0x02);
+static SENSOR_DEVICE_ATTR_2(temp2_max_alarm, S_IRUGO,
+        show_bit, NULL, 0x35, 0x02);
+static SENSOR_DEVICE_ATTR_2(temp2_crit_alarm, S_IRUGO,
+        show_bit, NULL, 0x37, 0x02);
+static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO | S_IWUSR,
+        show_hyst, store_hyst, 0x19);
+
+static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO | S_IWUSR,
+        show_temp, store_temp, 0x16);
+static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO | S_IWUSR,
+        show_temp, store_temp, 0x15);
+static SENSOR_DEVICE_ATTR(temp3_crit, S_IRUGO | S_IWUSR,
+        show_temp, store_temp, 0x1A);
+static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 0x23);
+static SENSOR_DEVICE_ATTR_2(temp3_min_alarm, S_IRUGO,
+        show_bit, NULL, 0x36, 0x04);
+static SENSOR_DEVICE_ATTR_2(temp3_max_alarm, S_IRUGO,
+        show_bit, NULL, 0x35, 0x04);
+static SENSOR_DEVICE_ATTR_2(temp3_crit_alarm, S_IRUGO,
+        show_bit, NULL, 0x37, 0x04);
+static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO | S_IWUSR,
+        show_hyst, store_hyst, 0x1A);
+
+static struct attribute *mid_att_thermal[] = {
+        &sensor_dev_attr_temp1_min.dev_attr.attr,
+        &sensor_dev_attr_temp1_max.dev_attr.attr,
+        &sensor_dev_attr_temp1_crit.dev_attr.attr,
+        &sensor_dev_attr_temp1_input.dev_attr.attr,
+        &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
+        &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
+        &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
+        &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
+        &sensor_dev_attr_temp2_min.dev_attr.attr,
+        &sensor_dev_attr_temp2_max.dev_attr.attr,
+        &sensor_dev_attr_temp2_crit.dev_attr.attr,
+        &sensor_dev_attr_temp2_input.dev_attr.attr,
+        &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
+        &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
+        &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
+        &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
+        &sensor_dev_attr_temp3_min.dev_attr.attr,
+        &sensor_dev_attr_temp3_max.dev_attr.attr,
+        &sensor_dev_attr_temp3_crit.dev_attr.attr,
+        &sensor_dev_attr_temp3_input.dev_attr.attr,
+        &sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
+        &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
+        &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
+        &sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
+        NULL
+};
+
+static const struct attribute_group m_thermal_gr = {
+        .attrs = mid_att_thermal
+};
+
+static int emc1403_detect(struct i2c_client *client,
+                        struct i2c_board_info *info)
+{
+        int id;
+        /* Check if thermal chip is SMSC and EMC1403 */
+
+        id = i2c_smbus_read_byte_data(client, THERMAL_SMSC_ID_REG);
+        if (id != 0x5d)
+                return -ENODEV;
+
+        /* Note: 0x25 is the 1404 which is very similar and this
+           driver could be extended */
+        id = i2c_smbus_read_byte_data(client, THERMAL_PID_REG);
+        if (id != 0x21)
+                return -ENODEV;
+
+        id = i2c_smbus_read_byte_data(client, THERMAL_REVISION_REG);
+        if (id != 0x01)
+                return -ENODEV;
+
+        strlcpy(info->type, "emc1403", I2C_NAME_SIZE);
+        return 0;
+}
+
+static int emc1403_probe(struct i2c_client *client,
+                        const struct i2c_device_id *id)
+{
+        int res;
+        struct thermal_data *data;
+
+        data = kzalloc(sizeof(struct thermal_data), GFP_KERNEL);
+        if (data == NULL) {
+                dev_warn(&client->dev, "out of memory");
+                return -ENOMEM;
+        }
+
+        i2c_set_clientdata(client, data);
+        mutex_init(&data->mutex);
+        data->hyst_valid = jiffies - 1;         /* Expired */
+
+        res = sysfs_create_group(&client->dev.kobj, &m_thermal_gr);
+        if (res) {
+                dev_warn(&client->dev, "create group failed\n");
+                hwmon_device_unregister(data->hwmon_dev);
+                goto thermal_error1;
+        }
+        data->hwmon_dev = hwmon_device_register(&client->dev);
+        if (IS_ERR(data->hwmon_dev)) {
+                res = PTR_ERR(data->hwmon_dev);
+                dev_warn(&client->dev, "register hwmon dev failed\n");
+                goto thermal_error2;
+        }
+        dev_info(&client->dev, "EMC1403 Thermal chip found\n");
+        return res;
+
+thermal_error2:
+        sysfs_remove_group(&client->dev.kobj, &m_thermal_gr);
+thermal_error1:
+        kfree(data);
+        return res;
+}
+
+static int emc1403_remove(struct i2c_client *client)
+{
+        struct thermal_data *data = i2c_get_clientdata(client);
+
+        hwmon_device_unregister(data->hwmon_dev);
+        sysfs_remove_group(&client->dev.kobj, &m_thermal_gr);
+        kfree(data);
+        return 0;
+}
+
+static const unsigned short emc1403_address_list[] = {
+        0x18, 0x2a, 0x4c, 0x4d, I2C_CLIENT_END
+};
+
+static const struct i2c_device_id emc1403_idtable[] = {
+        { "emc1403", 0 },
+        { }
+};
+MODULE_DEVICE_TABLE(i2c, emc1403_idtable);
+
+static struct i2c_driver sensor_emc1403 = {
+        .class = I2C_CLASS_HWMON,
+        .driver = {
+                .name = "emc1403",
+        },
+        .detect = emc1403_detect,
+        .probe = emc1403_probe,
+        .remove = emc1403_remove,
+        .id_table = emc1403_idtable,
+        .address_list = emc1403_address_list,
+};
+
+static int __init sensor_emc1403_init(void)
+{
+        return i2c_add_driver(&sensor_emc1403);
+}
+
+static void  __exit sensor_emc1403_exit(void)
+{
+        i2c_del_driver(&sensor_emc1403);
+}
+
+module_init(sensor_emc1403_init);
+module_exit(sensor_emc1403_exit);
+
+MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com");
+MODULE_DESCRIPTION("emc1403 Thermal Driver");
+MODULE_LICENSE("GPL v2");