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 <h...@denx.de> Cc: Jean Delvare <kh...@linux-fr.org> Cc: Guenter Roeck <li...@roeck-us.net> Cc: linux-kernel@vger.kernel.org --- 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 <h...@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). + +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 <h...@denx.de> + * + * Based on: + * Texas Instruments TMP102 SMBus temperature sensor driver + * + * Copyright (C) 2010 Steven King <sfk...@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> + +#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 <h...@denx.de>"); +MODULE_DESCRIPTION("Texas Instruments TMP103 temperature sensor driver"); +MODULE_LICENSE("GPL"); -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
