hwmon: LM95245 driver

A hwmon driver for the National Semiconductor LM95245 dual temperature
sensors chip.

Signed-off-by: Alexander Stein <alexander.stein@systec-electronic.com>
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>

4 files changed, 586 insertions, 0 deletions

diff --git a/Documentation/hwmon/lm95245 b/Documentation/hwmon/lm95245
new file mode 100644
index 000000000000..cbd8aeab7124
--- /dev/null
+++ b/Documentation/hwmon/lm95245
@@ -0,0 +1,33 @@
+Kernel driver lm95245
+==================
+
+Supported chips:
+  * National Semiconductor LM95245
+    Addresses scanned: I2C 0x18, 0x19, 0x29, 0x4c, 0x4d
+    Datasheet: Publicly available at the National Semiconductor website
+               http://www.national.com/mpf/LM/LM95245.html
+
+
+Author: Alexander Stein <alexander.stein@systec-electronic.com>
+
+Description
+-----------
+
+The LM95245 is an 11-bit digital temperature sensor with a 2-wire System
+Management Bus (SMBus) interface and TruTherm technology that can monitor
+the temperature of a remote diode as well as its own temperature.
+The LM95245 can be used to very accurately monitor the temperature of
+external devices such as microprocessors.
+
+All temperature values are given in millidegrees Celsius. Local temperature
+is given within a range of -127 to +127.875 degrees. Remote temperatures are
+given within a range of -127 to +255 degrees. Resolution depends on
+temperature input and range.
+
+Each sensor has its own critical limit, but the hysteresis is common to all
+two channels.
+
+The lm95245 driver can change its update interval to a fixed set of values.
+It will round up to the next selectable interval. See the datasheet for exact
+values. Reading sensor values more often will do no harm, but will return
+'old' values.
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 1396290a31a4..166889b326ff 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -702,6 +702,15 @@ config SENSORS_LM95241
           This driver can also be built as a module.  If so, the module
           will be called lm95241.
 
+config SENSORS_LM95245
+        tristate "National Semiconductor LM95245 sensor chip"
+        depends on I2C && EXPERIMENTAL
+        help
+          If you say yes here you get support for LM95245 sensor chip.
+
+          This driver can also be built as a module.  If so, the module
+          will be called lm95245.
+
 config SENSORS_MAX1111
         tristate "Maxim MAX1111 Multichannel, Serial 8-bit ADC chip"
         depends on SPI_MASTER
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 1b7dc770aa60..9a4473993845 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -80,6 +80,7 @@ obj-$(CONFIG_SENSORS_LM90)	+= lm90.o
 obj-$(CONFIG_SENSORS_LM92)      += lm92.o
 obj-$(CONFIG_SENSORS_LM93)      += lm93.o
 obj-$(CONFIG_SENSORS_LM95241)   += lm95241.o
+obj-$(CONFIG_SENSORS_LM95245)   += lm95245.o
 obj-$(CONFIG_SENSORS_LTC4151)   += ltc4151.o
 obj-$(CONFIG_SENSORS_LTC4215)   += ltc4215.o
 obj-$(CONFIG_SENSORS_LTC4245)   += ltc4245.o
diff --git a/drivers/hwmon/lm95245.c b/drivers/hwmon/lm95245.c
new file mode 100644
index 000000000000..dce9e68241e6
--- /dev/null
+++ b/drivers/hwmon/lm95245.c
@@ -0,0 +1,543 @@
+/*
+ * Copyright (C) 2011 Alexander Stein <alexander.stein@systec-electronic.com>
+ *
+ * The LM95245 is a sensor chip made by National Semiconductors.
+ * It reports up to two temperatures (its own plus an external one).
+ * Complete datasheet can be obtained from National's website at:
+ *   http://www.national.com/ds.cgi/LM/LM95245.pdf
+ *
+ * This driver is based on lm95241.c
+ *
+ * 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>
+
+#define DEVNAME "lm95245"
+
+static const unsigned short normal_i2c[] = {
+        0x18, 0x19, 0x29, 0x4c, 0x4d, I2C_CLIENT_END };
+
+/* LM95245 registers */
+/* general registers */
+#define LM95245_REG_RW_CONFIG1          0x03
+#define LM95245_REG_RW_CONVERS_RATE     0x04
+#define LM95245_REG_W_ONE_SHOT          0x0F
+
+/* diode configuration */
+#define LM95245_REG_RW_CONFIG2          0xBF
+#define LM95245_REG_RW_REMOTE_OFFH      0x11
+#define LM95245_REG_RW_REMOTE_OFFL      0x12
+
+/* status registers */
+#define LM95245_REG_R_STATUS1           0x02
+#define LM95245_REG_R_STATUS2           0x33
+
+/* limit registers */
+#define LM95245_REG_RW_REMOTE_OS_LIMIT          0x07
+#define LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT     0x20
+#define LM95245_REG_RW_REMOTE_TCRIT_LIMIT       0x19
+#define LM95245_REG_RW_COMMON_HYSTERESIS        0x21
+
+/* temperature signed */
+#define LM95245_REG_R_LOCAL_TEMPH_S     0x00
+#define LM95245_REG_R_LOCAL_TEMPL_S     0x30
+#define LM95245_REG_R_REMOTE_TEMPH_S    0x01
+#define LM95245_REG_R_REMOTE_TEMPL_S    0x10
+/* temperature unsigned */
+#define LM95245_REG_R_REMOTE_TEMPH_U    0x31
+#define LM95245_REG_R_REMOTE_TEMPL_U    0x32
+
+/* id registers */
+#define LM95245_REG_R_MAN_ID            0xFE
+#define LM95245_REG_R_CHIP_ID           0xFF
+
+/* LM95245 specific bitfields */
+#define CFG_STOP                0x40
+#define CFG_REMOTE_TCRIT_MASK   0x10
+#define CFG_REMOTE_OS_MASK      0x08
+#define CFG_LOCAL_TCRIT_MASK    0x04
+#define CFG_LOCAL_OS_MASK       0x02
+
+#define CFG2_OS_A0              0x40
+#define CFG2_DIODE_FAULT_OS     0x20
+#define CFG2_DIODE_FAULT_TCRIT  0x10
+#define CFG2_REMOTE_TT          0x08
+#define CFG2_REMOTE_FILTER_DIS  0x00
+#define CFG2_REMOTE_FILTER_EN   0x06
+
+/* conversation rate in ms */
+#define RATE_CR0063     0x00
+#define RATE_CR0364     0x01
+#define RATE_CR1000     0x02
+#define RATE_CR2500     0x03
+
+#define STATUS1_DIODE_FAULT     0x04
+#define STATUS1_RTCRIT          0x02
+#define STATUS1_LOC             0x01
+
+#define MANUFACTURER_ID         0x01
+#define DEFAULT_REVISION        0xB3
+
+static const u8 lm95245_reg_address[] = {
+        LM95245_REG_R_LOCAL_TEMPH_S,
+        LM95245_REG_R_LOCAL_TEMPL_S,
+        LM95245_REG_R_REMOTE_TEMPH_S,
+        LM95245_REG_R_REMOTE_TEMPL_S,
+        LM95245_REG_R_REMOTE_TEMPH_U,
+        LM95245_REG_R_REMOTE_TEMPL_U,
+        LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT,
+        LM95245_REG_RW_REMOTE_TCRIT_LIMIT,
+        LM95245_REG_RW_COMMON_HYSTERESIS,
+        LM95245_REG_R_STATUS1,
+};
+
+/* Client data (each client gets its own) */
+struct lm95245_data {
+        struct device *hwmon_dev;
+        struct mutex update_lock;
+        unsigned long last_updated;     /* in jiffies */
+        unsigned long interval; /* in msecs */
+        bool valid;             /* zero until following fields are valid */
+        /* registers values */
+        u8 regs[ARRAY_SIZE(lm95245_reg_address)];
+        u8 config1, config2;
+};
+
+/* Conversions */
+static int temp_from_reg_unsigned(u8 val_h, u8 val_l)
+{
+        return val_h * 1000 + val_l * 1000 / 256;
+}
+
+static int temp_from_reg_signed(u8 val_h, u8 val_l)
+{
+        if (val_h & 0x80)
+                return (val_h - 0x100) * 1000;
+        return temp_from_reg_unsigned(val_h, val_l);
+}
+
+static struct lm95245_data *lm95245_update_device(struct device *dev)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+        struct lm95245_data *data = i2c_get_clientdata(client);
+
+        mutex_lock(&data->update_lock);
+
+        if (time_after(jiffies, data->last_updated
+                + msecs_to_jiffies(data->interval)) || !data->valid) {
+                int i;
+
+                dev_dbg(&client->dev, "Updating lm95245 data.\n");
+                for (i = 0; i < ARRAY_SIZE(lm95245_reg_address); i++)
+                        data->regs[i]
+                          = i2c_smbus_read_byte_data(client,
+                                                     lm95245_reg_address[i]);
+                data->last_updated = jiffies;
+                data->valid = 1;
+        }
+
+        mutex_unlock(&data->update_lock);
+
+        return data;
+}
+
+static unsigned long lm95245_read_conversion_rate(struct i2c_client *client)
+{
+        int rate;
+        unsigned long interval;
+
+        rate = i2c_smbus_read_byte_data(client, LM95245_REG_RW_CONVERS_RATE);
+
+        switch (rate) {
+        case RATE_CR0063:
+                interval = 63;
+                break;
+        case RATE_CR0364:
+                interval = 364;
+                break;
+        case RATE_CR1000:
+                interval = 1000;
+                break;
+        case RATE_CR2500:
+        default:
+                interval = 2500;
+                break;
+        }
+
+        return interval;
+}
+
+static unsigned long lm95245_set_conversion_rate(struct i2c_client *client,
+                        unsigned long interval)
+{
+        int rate;
+
+        if (interval <= 63) {
+                interval = 63;
+                rate = RATE_CR0063;
+        } else if (interval <= 364) {
+                interval = 364;
+                rate = RATE_CR0364;
+        } else if (interval <= 1000) {
+                interval = 1000;
+                rate = RATE_CR1000;
+        } else {
+                interval = 2500;
+                rate = RATE_CR2500;
+        }
+
+        i2c_smbus_write_byte_data(client, LM95245_REG_RW_CONVERS_RATE, rate);
+
+        return interval;
+}
+
+/* Sysfs stuff */
+static ssize_t show_input(struct device *dev, struct device_attribute *attr,
+                          char *buf)
+{
+        struct lm95245_data *data = lm95245_update_device(dev);
+        int temp;
+        int index = to_sensor_dev_attr(attr)->index;
+
+        /*
+         * Index 0 (Local temp) is always signed
+         * Index 2 (Remote temp) has both signed and unsigned data
+         * use signed calculation for remote if signed bit is set
+         */
+        if (index == 0 || data->regs[index] & 0x80)
+                temp = temp_from_reg_signed(data->regs[index],
+                            data->regs[index + 1]);
+        else
+                temp = temp_from_reg_unsigned(data->regs[index + 2],
+                            data->regs[index + 3]);
+
+        return snprintf(buf, PAGE_SIZE - 1, "%d\n", temp);
+}
+
+static ssize_t show_limit(struct device *dev, struct device_attribute *attr,
+                         char *buf)
+{
+        struct lm95245_data *data = lm95245_update_device(dev);
+        int index = to_sensor_dev_attr(attr)->index;
+
+        return snprintf(buf, PAGE_SIZE - 1, "%d\n",
+                        data->regs[index] * 1000);
+}
+
+static ssize_t set_limit(struct device *dev, struct device_attribute *attr,
+                        const char *buf, size_t count)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+        struct lm95245_data *data = i2c_get_clientdata(client);
+        int index = to_sensor_dev_attr(attr)->index;
+        unsigned long val;
+
+        if (strict_strtoul(buf, 10, &val) < 0)
+                return -EINVAL;
+
+        val /= 1000;
+
+        val = SENSORS_LIMIT(val, 0, (index == 6 ? 127 : 255));
+
+        mutex_lock(&data->update_lock);
+
+        data->valid = 0;
+
+        i2c_smbus_write_byte_data(client, lm95245_reg_address[index], val);
+
+        mutex_unlock(&data->update_lock);
+
+        return count;
+}
+
+static ssize_t set_crit_hyst(struct device *dev, struct device_attribute *attr,
+                        const char *buf, size_t count)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+        struct lm95245_data *data = i2c_get_clientdata(client);
+        unsigned long val;
+
+        if (strict_strtoul(buf, 10, &val) < 0)
+                return -EINVAL;
+
+        val /= 1000;
+
+        val = SENSORS_LIMIT(val, 0, 31);
+
+        mutex_lock(&data->update_lock);
+
+        data->valid = 0;
+
+        /* shared crit hysteresis */
+        i2c_smbus_write_byte_data(client, LM95245_REG_RW_COMMON_HYSTERESIS,
+                val);
+
+        mutex_unlock(&data->update_lock);
+
+        return count;
+}
+
+static ssize_t show_type(struct device *dev, struct device_attribute *attr,
+                         char *buf)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+        struct lm95245_data *data = i2c_get_clientdata(client);
+
+        return snprintf(buf, PAGE_SIZE - 1,
+                data->config2 & CFG2_REMOTE_TT ? "1\n" : "2\n");
+}
+
+static ssize_t set_type(struct device *dev, struct device_attribute *attr,
+                        const char *buf, size_t count)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+        struct lm95245_data *data = i2c_get_clientdata(client);
+        unsigned long val;
+
+        if (strict_strtoul(buf, 10, &val) < 0)
+                return -EINVAL;
+        if (val != 1 && val != 2)
+                return -EINVAL;
+
+        mutex_lock(&data->update_lock);
+
+        if (val == 1)
+                data->config2 |= CFG2_REMOTE_TT;
+        else
+                data->config2 &= ~CFG2_REMOTE_TT;
+
+        data->valid = 0;
+
+        i2c_smbus_write_byte_data(client, LM95245_REG_RW_CONFIG2,
+                                  data->config2);
+
+        mutex_unlock(&data->update_lock);
+
+        return count;
+}
+
+static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
+                         char *buf)
+{
+        struct lm95245_data *data = lm95245_update_device(dev);
+        int index = to_sensor_dev_attr(attr)->index;
+
+        return snprintf(buf, PAGE_SIZE - 1, "%d\n",
+                        !!(data->regs[9] & index));
+}
+
+static ssize_t show_interval(struct device *dev, struct device_attribute *attr,
+                             char *buf)
+{
+        struct lm95245_data *data = lm95245_update_device(dev);
+
+        return snprintf(buf, PAGE_SIZE - 1, "%lu\n", data->interval);
+}
+
+static ssize_t set_interval(struct device *dev, struct device_attribute *attr,
+                            const char *buf, size_t count)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+        struct lm95245_data *data = i2c_get_clientdata(client);
+        unsigned long val;
+
+        if (strict_strtoul(buf, 10, &val) < 0)
+                return -EINVAL;
+
+        mutex_lock(&data->update_lock);
+
+        data->interval = lm95245_set_conversion_rate(client, val);
+
+        mutex_unlock(&data->update_lock);
+
+        return count;
+}
+
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_input, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_limit,
+                set_limit, 6);
+static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_limit,
+                set_crit_hyst, 8);
+static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL,
+                STATUS1_LOC);
+
+static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_input, NULL, 2);
+static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_limit,
+                set_limit, 7);
+static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IWUSR | S_IRUGO, show_limit,
+                set_crit_hyst, 8);
+static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL,
+                STATUS1_RTCRIT);
+static SENSOR_DEVICE_ATTR(temp2_type, S_IWUSR | S_IRUGO, show_type,
+                set_type, 0);
+static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL,
+                STATUS1_DIODE_FAULT);
+
+static DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO, show_interval,
+                set_interval);
+
+static struct attribute *lm95245_attributes[] = {
+        &sensor_dev_attr_temp1_input.dev_attr.attr,
+        &sensor_dev_attr_temp1_crit.dev_attr.attr,
+        &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
+        &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
+        &sensor_dev_attr_temp2_input.dev_attr.attr,
+        &sensor_dev_attr_temp2_crit.dev_attr.attr,
+        &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
+        &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
+        &sensor_dev_attr_temp2_type.dev_attr.attr,
+        &sensor_dev_attr_temp2_fault.dev_attr.attr,
+        &dev_attr_update_interval.attr,
+        NULL
+};
+
+static const struct attribute_group lm95245_group = {
+        .attrs = lm95245_attributes,
+};
+
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int lm95245_detect(struct i2c_client *new_client,
+                          struct i2c_board_info *info)
+{
+        struct i2c_adapter *adapter = new_client->adapter;
+
+        if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+                return -ENODEV;
+
+        if (i2c_smbus_read_byte_data(new_client, LM95245_REG_R_MAN_ID)
+                        != MANUFACTURER_ID
+                || i2c_smbus_read_byte_data(new_client, LM95245_REG_R_CHIP_ID)
+                        != DEFAULT_REVISION)
+                return -ENODEV;
+
+        strlcpy(info->type, DEVNAME, I2C_NAME_SIZE);
+        return 0;
+}
+
+static void lm95245_init_client(struct i2c_client *client)
+{
+        struct lm95245_data *data = i2c_get_clientdata(client);
+
+        data->valid = 0;
+        data->interval = lm95245_read_conversion_rate(client);
+
+        data->config1 = i2c_smbus_read_byte_data(client,
+                LM95245_REG_RW_CONFIG1);
+        data->config2 = i2c_smbus_read_byte_data(client,
+                LM95245_REG_RW_CONFIG2);
+
+        if (data->config1 & CFG_STOP) {
+                /* Clear the standby bit */
+                data->config1 &= ~CFG_STOP;
+                i2c_smbus_write_byte_data(client, LM95245_REG_RW_CONFIG1,
+                        data->config1);
+        }
+}
+
+static int lm95245_probe(struct i2c_client *new_client,
+                         const struct i2c_device_id *id)
+{
+        struct lm95245_data *data;
+        int err;
+
+        data = kzalloc(sizeof(struct lm95245_data), GFP_KERNEL);
+        if (!data) {
+                err = -ENOMEM;
+                goto exit;
+        }
+
+        i2c_set_clientdata(new_client, data);
+        mutex_init(&data->update_lock);
+
+        /* Initialize the LM95245 chip */
+        lm95245_init_client(new_client);
+
+        /* Register sysfs hooks */
+        err = sysfs_create_group(&new_client->dev.kobj, &lm95245_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, &lm95245_group);
+exit_free:
+        kfree(data);
+exit:
+        return err;
+}
+
+static int lm95245_remove(struct i2c_client *client)
+{
+        struct lm95245_data *data = i2c_get_clientdata(client);
+
+        hwmon_device_unregister(data->hwmon_dev);
+        sysfs_remove_group(&client->dev.kobj, &lm95245_group);
+
+        kfree(data);
+        return 0;
+}
+
+/* Driver data (common to all clients) */
+static const struct i2c_device_id lm95245_id[] = {
+        { DEVNAME, 0 },
+        { }
+};
+MODULE_DEVICE_TABLE(i2c, lm95245_id);
+
+static struct i2c_driver lm95245_driver = {
+        .class          = I2C_CLASS_HWMON,
+        .driver = {
+                .name   = DEVNAME,
+        },
+        .probe          = lm95245_probe,
+        .remove         = lm95245_remove,
+        .id_table       = lm95245_id,
+        .detect         = lm95245_detect,
+        .address_list   = normal_i2c,
+};
+
+static int __init sensors_lm95245_init(void)
+{
+        return i2c_add_driver(&lm95245_driver);
+}
+
+static void __exit sensors_lm95245_exit(void)
+{
+        i2c_del_driver(&lm95245_driver);
+}
+
+MODULE_AUTHOR("Alexander Stein <alexander.stein@systec-electronic.com>");
+MODULE_DESCRIPTION("LM95245 sensor driver");
+MODULE_LICENSE("GPL");
+
+module_init(sensors_lm95245_init);
+module_exit(sensors_lm95245_exit);