hwmon: Driver for TI TMP103 temperature sensor
authorHeiko Schocher <hs@denx.de>
Wed, 18 Jun 2014 05:37:17 +0000 (07:37 +0200)
committerGuenter Roeck <linux@roeck-us.net>
Mon, 4 Aug 2014 14:01:33 +0000 (07:01 -0700)
Driver for the TI TMP103.

The TI TMP103 is similar to the TMP102.  It differs from the TMP102
by having only 8 bit registers.

Signed-off-by: Heiko Schocher <hs@denx.de>
[linux@roeck-us.net: Select REGMAP_I2C in Kconfig]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Documentation/devicetree/bindings/i2c/trivial-devices.txt
Documentation/hwmon/tmp103 [new file with mode: 0644]
drivers/hwmon/Kconfig
drivers/hwmon/Makefile
drivers/hwmon/tmp103.c [new file with mode: 0644]

index bef86e57c3889d4890ddd0212867c087ac72e989..fc944e0ed039ab20e0bc5132d65f075f450136db 100644 (file)
@@ -83,5 +83,6 @@ stm,m41t80            M41T80 - SERIAL ACCESS RTC WITH ALARMS
 taos,tsl2550           Ambient Light Sensor with SMBUS/Two Wire Serial Interface
 ti,tsc2003             I2C Touch-Screen Controller
 ti,tmp102              Low Power Digital Temperature Sensor with SMBUS/Two Wire Serial Interface
+ti,tmp103              Low Power Digital Temperature Sensor with SMBUS/Two Wire Serial Interface
 ti,tmp275              Digital Temperature Sensor
 winbond,wpct301                i2c trusted platform module (TPM)
diff --git a/Documentation/hwmon/tmp103 b/Documentation/hwmon/tmp103
new file mode 100644 (file)
index 0000000..ec00a15
--- /dev/null
@@ -0,0 +1,28 @@
+Kernel driver tmp103
+====================
+
+Supported chips:
+  * Texas Instruments TMP103
+    Prefix: 'tmp103'
+    Addresses scanned: none
+    Product info and datasheet: http://www.ti.com/product/tmp103
+
+Author:
+       Heiko Schocher <hs@denx.de>
+
+Description
+-----------
+
+The TMP103 is a digital output temperature sensor in a four-ball
+wafer chip-scale package (WCSP). The TMP103 is capable of reading
+temperatures to a resolution of 1°C. The TMP103 is specified for
+operation over a temperature range of –40°C to +125°C.
+
+Resolution: 8 Bits
+Accuracy: ±1°C Typ (–10°C to +100°C)
+
+The driver provides the common sysfs-interface for temperatures (see
+Documentation/hwmon/sysfs-interface under Temperatures).
+
+Please refer how to instantiate this driver:
+Documentation/i2c/instantiating-devices
index d8410df01fd2f974f8082bcf07c758069f85c40e..a01a166e511bad327bffaecc217ffaa3b4389f5e 100644 (file)
@@ -1405,6 +1405,17 @@ config SENSORS_TMP102
          This driver can also be built as a module.  If so, the module
          will be called tmp102.
 
+config SENSORS_TMP103
+       tristate "Texas Instruments TMP103"
+       depends on I2C
+       select REGMAP_I2C
+       help
+         If you say yes here you get support for Texas Instruments TMP103
+         sensor chips.
+
+         This driver can also be built as a module.  If so, the module
+         will be called tmp103.
+
 config SENSORS_TMP401
        tristate "Texas Instruments TMP401 and compatibles"
        depends on I2C
index b5914d8f770cd4a749b4984f38199f15fc04deec..1362382a3187056463aadfc1fb517046a37cfc00 100644 (file)
@@ -136,6 +136,7 @@ obj-$(CONFIG_SENSORS_SMSC47M192)+= smsc47m192.o
 obj-$(CONFIG_SENSORS_AMC6821)  += amc6821.o
 obj-$(CONFIG_SENSORS_THMC50)   += thmc50.o
 obj-$(CONFIG_SENSORS_TMP102)   += tmp102.o
+obj-$(CONFIG_SENSORS_TMP103)   += tmp103.o
 obj-$(CONFIG_SENSORS_TMP401)   += tmp401.o
 obj-$(CONFIG_SENSORS_TMP421)   += tmp421.o
 obj-$(CONFIG_SENSORS_TWL4030_MADC)+= twl4030-madc-hwmon.o
diff --git a/drivers/hwmon/tmp103.c b/drivers/hwmon/tmp103.c
new file mode 100644 (file)
index 0000000..e69dbca
--- /dev/null
@@ -0,0 +1,205 @@
+/*
+ * Texas Instruments TMP103 SMBus temperature sensor driver
+ * Copyright (C) 2014 Heiko Schocher <hs@denx.de>
+ *
+ * Based on:
+ * Texas Instruments TMP102 SMBus temperature sensor driver
+ *
+ * Copyright (C) 2010 Steven King <sfking@fdwdc.com>
+ *
+ * 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.
+ *
+ */
+
+#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/mutex.h>
+#include <linux/device.h>
+#include <linux/jiffies.h>
+#include <linux/regmap.h>
+
+#define TMP103_TEMP_REG                0x00
+#define TMP103_CONF_REG                0x01
+#define TMP103_TLOW_REG                0x02
+#define TMP103_THIGH_REG       0x03
+
+#define TMP103_CONF_M0         0x01
+#define TMP103_CONF_M1         0x02
+#define TMP103_CONF_LC         0x04
+#define TMP103_CONF_FL         0x08
+#define TMP103_CONF_FH         0x10
+#define TMP103_CONF_CR0                0x20
+#define TMP103_CONF_CR1                0x40
+#define TMP103_CONF_ID         0x80
+#define TMP103_CONF_SD         (TMP103_CONF_M1)
+#define TMP103_CONF_SD_MASK    (TMP103_CONF_M0 | TMP103_CONF_M1)
+
+#define TMP103_CONFIG          (TMP103_CONF_CR1 | TMP103_CONF_M1)
+#define TMP103_CONFIG_MASK     (TMP103_CONF_CR0 | TMP103_CONF_CR1 | \
+                                TMP103_CONF_M0 | TMP103_CONF_M1)
+
+static inline int tmp103_reg_to_mc(s8 val)
+{
+       return val * 1000;
+}
+
+static inline u8 tmp103_mc_to_reg(int val)
+{
+       return DIV_ROUND_CLOSEST(val, 1000);
+}
+
+static ssize_t tmp103_show_temp(struct device *dev,
+                               struct device_attribute *attr,
+                               char *buf)
+{
+       struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
+       struct regmap *regmap = dev_get_drvdata(dev);
+       unsigned int regval;
+       int ret;
+
+       ret = regmap_read(regmap, sda->index, &regval);
+       if (ret < 0)
+               return ret;
+
+       return sprintf(buf, "%d\n", tmp103_reg_to_mc(regval));
+}
+
+static ssize_t tmp103_set_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 regmap *regmap = dev_get_drvdata(dev);
+       long val;
+       int ret;
+
+       if (kstrtol(buf, 10, &val) < 0)
+               return -EINVAL;
+
+       val = clamp_val(val, -55000, 127000);
+       ret = regmap_write(regmap, sda->index, tmp103_mc_to_reg(val));
+       return ret ? ret : count;
+}
+
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, tmp103_show_temp, NULL ,
+                         TMP103_TEMP_REG);
+
+static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, tmp103_show_temp,
+                         tmp103_set_temp, TMP103_TLOW_REG);
+
+static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, tmp103_show_temp,
+                         tmp103_set_temp, TMP103_THIGH_REG);
+
+static struct attribute *tmp103_attrs[] = {
+       &sensor_dev_attr_temp1_input.dev_attr.attr,
+       &sensor_dev_attr_temp1_min.dev_attr.attr,
+       &sensor_dev_attr_temp1_max.dev_attr.attr,
+       NULL
+};
+ATTRIBUTE_GROUPS(tmp103);
+
+static bool tmp103_regmap_is_volatile(struct device *dev, unsigned int reg)
+{
+       return reg == TMP103_TEMP_REG;
+}
+
+static struct regmap_config tmp103_regmap_config = {
+       .reg_bits = 8,
+       .val_bits = 8,
+       .max_register = TMP103_THIGH_REG,
+       .volatile_reg = tmp103_regmap_is_volatile,
+};
+
+static int tmp103_probe(struct i2c_client *client,
+                       const struct i2c_device_id *id)
+{
+       struct device *dev = &client->dev;
+       struct device *hwmon_dev;
+       struct regmap *regmap;
+       int ret;
+
+       if (!i2c_check_functionality(client->adapter,
+                                    I2C_FUNC_SMBUS_BYTE_DATA)) {
+               dev_err(&client->dev,
+                       "adapter doesn't support SMBus byte transactions\n");
+               return -ENODEV;
+       }
+
+       regmap = devm_regmap_init_i2c(client, &tmp103_regmap_config);
+       if (IS_ERR(regmap)) {
+               dev_err(dev, "failed to allocate register map\n");
+               return PTR_ERR(regmap);
+       }
+
+       ret = regmap_update_bits(regmap, TMP103_CONF_REG, TMP103_CONFIG_MASK,
+                                TMP103_CONFIG);
+       if (ret < 0) {
+               dev_err(&client->dev, "error writing config register\n");
+               return ret;
+       }
+
+       hwmon_dev = hwmon_device_register_with_groups(dev, client->name,
+                                                     regmap, tmp103_groups);
+       return PTR_ERR_OR_ZERO(hwmon_dev);
+}
+
+#ifdef CONFIG_PM
+static int tmp103_suspend(struct device *dev)
+{
+       struct regmap *regmap = dev_get_drvdata(dev);
+
+       return regmap_update_bits(regmap, TMP103_CONF_REG,
+                                 TMP103_CONF_SD_MASK, 0);
+}
+
+static int tmp103_resume(struct device *dev)
+{
+       struct regmap *regmap = dev_get_drvdata(dev);
+
+       return regmap_update_bits(regmap, TMP103_CONF_REG,
+                                 TMP103_CONF_SD_MASK, TMP103_CONF_SD);
+}
+
+static const struct dev_pm_ops tmp103_dev_pm_ops = {
+       .suspend        = tmp103_suspend,
+       .resume         = tmp103_resume,
+};
+
+#define TMP103_DEV_PM_OPS (&tmp103_dev_pm_ops)
+#else
+#define        TMP103_DEV_PM_OPS NULL
+#endif /* CONFIG_PM */
+
+static const struct i2c_device_id tmp103_id[] = {
+       { "tmp103", 0 },
+       { }
+};
+MODULE_DEVICE_TABLE(i2c, tmp103_id);
+
+static struct i2c_driver tmp103_driver = {
+       .driver = {
+               .name   = "tmp103",
+               .pm     = TMP103_DEV_PM_OPS,
+       },
+       .probe          = tmp103_probe,
+       .id_table       = tmp103_id,
+};
+
+module_i2c_driver(tmp103_driver);
+
+MODULE_AUTHOR("Heiko Schocher <hs@denx.de>");
+MODULE_DESCRIPTION("Texas Instruments TMP103 temperature sensor driver");
+MODULE_LICENSE("GPL");