[PATCH 09/13] hwmon: Driver for TI TMP103 temperature sensor
From: Heiko Schocher
Date: Wed Jun 11 2014 - 02:28:30 EST
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@xxxxxxx>
Cc: Jean Delvare <khali@xxxxxxxxxxxx>
Cc: Guenter Roeck <linux@xxxxxxxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
---
Documentation/devicetree/bindings/hwmon/tmp103 | 30 +++
drivers/hwmon/Kconfig | 10 +
drivers/hwmon/Makefile | 1 +
drivers/hwmon/tmp103.c | 281 +++++++++++++++++++++++++
4 files changed, 322 insertions(+)
create mode 100644 Documentation/devicetree/bindings/hwmon/tmp103
create mode 100644 drivers/hwmon/tmp103.c
diff --git a/Documentation/devicetree/bindings/hwmon/tmp103 b/Documentation/devicetree/bindings/hwmon/tmp103
new file mode 100644
index 0000000..36d7b36
--- /dev/null
+++ b/Documentation/devicetree/bindings/hwmon/tmp103
@@ -0,0 +1,30 @@
+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@xxxxxxx>
+
+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 1ÂC. The TMP103 is specified for
+operation over a temperature range of â40ÂC to +125ÂC.
+
+Resolution: 8 Bits
+Accuracy: Â1ÂC Typ (â10ÂC to +100ÂC)
+
+The driver provides the common sysfs-interface for temperatures (see
+Documentation/hwmon/sysfs-interface under Temperatures).
+
+Required node properties:
+- compatible: manufacturer and chip name
+ "ti,tmp103"
+- reg: I2C bus address of the device
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 0034316..0f44dbb 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -1381,6 +1381,16 @@ 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
+ 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
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 11798ad..8e2f6a2 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -134,6 +134,7 @@ 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
index 0000000..0bd33d6
--- /dev/null
+++ b/drivers/hwmon/tmp103.c
@@ -0,0 +1,281 @@
+/*
+ * Texas Instruments TMP103 SMBus temperature sensor driver
+ * Copyright (C) 2014 Heiko Schocher <hs@xxxxxxx>
+ *
+ * Based on:
+ * Texas Instruments TMP102 SMBus temperature sensor driver
+ *
+ * Copyright (C) 2010 Steven King <sfking@xxxxxxxxx>
+ *
+ * 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>
+
+#define DRIVER_NAME "tmp103"
+
+#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_M0 | TMP103_CONF_M1)
+
+struct tmp103 {
+ struct device *hwmon_dev;
+ struct mutex lock;
+ u16 config_orig;
+ unsigned long last_update;
+ int temp[3];
+};
+
+static inline int tmp103_reg_to_mC(s8 val)
+{
+ return val * 1000;
+}
+
+static inline u8 tmp103_mC_to_reg(int val)
+{
+ return val / 1000;
+}
+
+static const u8 tmp103_reg[] = {
+ TMP103_TEMP_REG,
+ TMP103_TLOW_REG,
+ TMP103_THIGH_REG,
+};
+
+static struct tmp103 *tmp103_update_device(struct i2c_client *client)
+{
+ struct tmp103 *tmp103 = i2c_get_clientdata(client);
+
+ mutex_lock(&tmp103->lock);
+ if (time_after(jiffies, tmp103->last_update + HZ / 3)) {
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(tmp103->temp); ++i) {
+ int status = i2c_smbus_read_byte_data(client,
+ tmp103_reg[i]);
+ if (status > -1)
+ tmp103->temp[i] = tmp103_reg_to_mC(status);
+ }
+ tmp103->last_update = jiffies;
+ }
+ mutex_unlock(&tmp103->lock);
+ return tmp103;
+}
+
+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 tmp103 *tmp103 = tmp103_update_device(to_i2c_client(dev));
+
+ return sprintf(buf, "%d\n", tmp103->temp[sda->index]);
+}
+
+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 i2c_client *client = to_i2c_client(dev);
+ struct tmp103 *tmp103 = i2c_get_clientdata(client);
+ long val;
+ int status;
+
+ if (kstrtol(buf, 10, &val) < 0)
+ return -EINVAL;
+ val = clamp_val(val, -55000, 128000);
+
+ mutex_lock(&tmp103->lock);
+ tmp103->temp[sda->index] = val;
+ status = i2c_smbus_write_byte_data(client, tmp103_reg[sda->index],
+ tmp103_mC_to_reg(val));
+ mutex_unlock(&tmp103->lock);
+ return status ? : count;
+}
+
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, tmp103_show_temp, NULL , 0);
+
+static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, tmp103_show_temp,
+ tmp103_set_temp, 1);
+
+static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, tmp103_show_temp,
+ tmp103_set_temp, 2);
+
+static struct attribute *tmp103_attributes[] = {
+ &sensor_dev_attr_temp1_input.dev_attr.attr,
+ &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
+ &sensor_dev_attr_temp1_max.dev_attr.attr,
+ NULL
+};
+
+static const struct attribute_group tmp103_attr_group = {
+ .attrs = tmp103_attributes,
+};
+
+#define TMP103_CONFIG (TMP103_CONF_CR1 | TMP103_CONF_M1)
+#define TMP103_CONFIG_RD_ONLY (TMP103_CONF_CR1 | TMP103_CONF_M1)
+
+static int tmp103_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct tmp103 *tmp103;
+ int status;
+
+ if (!i2c_check_functionality(client->adapter,
+ I2C_FUNC_SMBUS_WORD_DATA)) {
+ dev_err(&client->dev,
+ "adapter doesn't support SMBus word transactions\n");
+ return -ENODEV;
+ }
+
+ tmp103 = devm_kzalloc(&client->dev, sizeof(*tmp103), GFP_KERNEL);
+ if (!tmp103)
+ return -ENOMEM;
+
+ i2c_set_clientdata(client, tmp103);
+
+ status = i2c_smbus_read_byte_data(client, TMP103_CONF_REG);
+ if (status < 0) {
+ dev_err(&client->dev, "error reading config register\n");
+ return status;
+ }
+ tmp103->config_orig = status;
+ status = i2c_smbus_write_byte_data(client, TMP103_CONF_REG,
+ TMP103_CONFIG);
+ if (status < 0) {
+ dev_err(&client->dev, "error writing config register\n");
+ goto fail_restore_config;
+ }
+ status = i2c_smbus_read_byte_data(client, TMP103_CONF_REG);
+ if (status < 0) {
+ dev_err(&client->dev, "error reading config register\n");
+ goto fail_restore_config;
+ }
+ if (status != TMP103_CONFIG) {
+ dev_err(&client->dev, "config settings did not stick\n");
+ status = -ENODEV;
+ goto fail_restore_config;
+ }
+ tmp103->last_update = jiffies - HZ;
+ mutex_init(&tmp103->lock);
+
+ status = sysfs_create_group(&client->dev.kobj, &tmp103_attr_group);
+ if (status) {
+ dev_dbg(&client->dev, "could not create sysfs files\n");
+ goto fail_restore_config;
+ }
+ tmp103->hwmon_dev = hwmon_device_register(&client->dev);
+ if (IS_ERR(tmp103->hwmon_dev)) {
+ dev_dbg(&client->dev, "unable to register hwmon device\n");
+ status = PTR_ERR(tmp103->hwmon_dev);
+ goto fail_remove_sysfs;
+ }
+
+ dev_info(&client->dev, "initialized\n");
+
+ return 0;
+
+fail_remove_sysfs:
+ sysfs_remove_group(&client->dev.kobj, &tmp103_attr_group);
+fail_restore_config:
+ i2c_smbus_write_word_swapped(client, TMP103_CONF_REG,
+ tmp103->config_orig);
+ return status;
+}
+
+static int tmp103_remove(struct i2c_client *client)
+{
+ struct tmp103 *tmp103 = i2c_get_clientdata(client);
+
+ hwmon_device_unregister(tmp103->hwmon_dev);
+ sysfs_remove_group(&client->dev.kobj, &tmp103_attr_group);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int tmp103_suspend(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ int config;
+
+ config = i2c_smbus_read_word_swapped(client, TMP103_CONF_REG);
+ if (config < 0)
+ return config;
+
+ config &= ~TMP103_CONF_SD;
+ return i2c_smbus_write_word_swapped(client, TMP103_CONF_REG, config);
+}
+
+static int tmp103_resume(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ int config;
+
+ config = i2c_smbus_read_word_swapped(client, TMP103_CONF_REG);
+ if (config < 0)
+ return config;
+
+ config |= TMP103_CONF_SD;
+ return i2c_smbus_write_word_swapped(client, TMP103_CONF_REG, config);
+}
+
+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[] = {
+ { DRIVER_NAME, 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, tmp103_id);
+
+static struct i2c_driver tmp103_driver = {
+ .driver.name = DRIVER_NAME,
+ .driver.pm = TMP103_DEV_PM_OPS,
+ .probe = tmp103_probe,
+ .remove = tmp103_remove,
+ .id_table = tmp103_id,
+};
+
+module_i2c_driver(tmp103_driver);
+
+MODULE_AUTHOR("Heiko Schocher <hs@xxxxxxx>");
+MODULE_DESCRIPTION("Texas Instruments TMP103 temperature sensor driver");
+MODULE_LICENSE("GPL");
--
1.8.3.1
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