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225 lines
5.1 KiB
225 lines
5.1 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Texas Instruments TMP103 SMBus temperature sensor driver |
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* Copyright (C) 2014 Heiko Schocher <[email protected]> |
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* |
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* Based on: |
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* Texas Instruments TMP102 SMBus temperature sensor driver |
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* |
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* Copyright (C) 2010 Steven King <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/slab.h> |
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#include <linux/i2c.h> |
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#include <linux/hwmon.h> |
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#include <linux/hwmon-sysfs.h> |
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#include <linux/err.h> |
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#include <linux/mutex.h> |
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#include <linux/device.h> |
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#include <linux/jiffies.h> |
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#include <linux/regmap.h> |
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#define TMP103_TEMP_REG 0x00 |
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#define TMP103_CONF_REG 0x01 |
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#define TMP103_TLOW_REG 0x02 |
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#define TMP103_THIGH_REG 0x03 |
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#define TMP103_CONF_M0 0x01 |
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#define TMP103_CONF_M1 0x02 |
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#define TMP103_CONF_LC 0x04 |
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#define TMP103_CONF_FL 0x08 |
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#define TMP103_CONF_FH 0x10 |
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#define TMP103_CONF_CR0 0x20 |
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#define TMP103_CONF_CR1 0x40 |
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#define TMP103_CONF_ID 0x80 |
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#define TMP103_CONF_SD (TMP103_CONF_M1) |
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#define TMP103_CONF_SD_MASK (TMP103_CONF_M0 | TMP103_CONF_M1) |
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#define TMP103_CONFIG (TMP103_CONF_CR1 | TMP103_CONF_M1) |
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#define TMP103_CONFIG_MASK (TMP103_CONF_CR0 | TMP103_CONF_CR1 | \ |
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TMP103_CONF_M0 | TMP103_CONF_M1) |
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static inline int tmp103_reg_to_mc(s8 val) |
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{ |
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return val * 1000; |
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} |
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static inline u8 tmp103_mc_to_reg(int val) |
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{ |
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return DIV_ROUND_CLOSEST(val, 1000); |
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} |
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static int tmp103_read(struct device *dev, enum hwmon_sensor_types type, |
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u32 attr, int channel, long *temp) |
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{ |
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struct regmap *regmap = dev_get_drvdata(dev); |
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unsigned int regval; |
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int err, reg; |
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switch (attr) { |
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case hwmon_temp_input: |
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reg = TMP103_TEMP_REG; |
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break; |
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case hwmon_temp_min: |
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reg = TMP103_TLOW_REG; |
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break; |
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case hwmon_temp_max: |
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reg = TMP103_THIGH_REG; |
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break; |
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default: |
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return -EOPNOTSUPP; |
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} |
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err = regmap_read(regmap, reg, ®val); |
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if (err < 0) |
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return err; |
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*temp = tmp103_reg_to_mc(regval); |
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return 0; |
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} |
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static int tmp103_write(struct device *dev, enum hwmon_sensor_types type, |
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u32 attr, int channel, long temp) |
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{ |
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struct regmap *regmap = dev_get_drvdata(dev); |
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int reg; |
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switch (attr) { |
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case hwmon_temp_min: |
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reg = TMP103_TLOW_REG; |
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break; |
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case hwmon_temp_max: |
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reg = TMP103_THIGH_REG; |
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break; |
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default: |
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return -EOPNOTSUPP; |
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} |
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temp = clamp_val(temp, -55000, 127000); |
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return regmap_write(regmap, reg, tmp103_mc_to_reg(temp)); |
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} |
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static umode_t tmp103_is_visible(const void *data, enum hwmon_sensor_types type, |
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u32 attr, int channel) |
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{ |
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if (type != hwmon_temp) |
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return 0; |
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switch (attr) { |
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case hwmon_temp_input: |
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return 0444; |
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case hwmon_temp_min: |
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case hwmon_temp_max: |
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return 0644; |
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default: |
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return 0; |
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} |
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} |
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static const struct hwmon_channel_info *tmp103_info[] = { |
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HWMON_CHANNEL_INFO(chip, |
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HWMON_C_REGISTER_TZ), |
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HWMON_CHANNEL_INFO(temp, |
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HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MIN), |
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NULL |
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}; |
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static const struct hwmon_ops tmp103_hwmon_ops = { |
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.is_visible = tmp103_is_visible, |
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.read = tmp103_read, |
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.write = tmp103_write, |
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}; |
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static const struct hwmon_chip_info tmp103_chip_info = { |
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.ops = &tmp103_hwmon_ops, |
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.info = tmp103_info, |
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}; |
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static bool tmp103_regmap_is_volatile(struct device *dev, unsigned int reg) |
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{ |
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return reg == TMP103_TEMP_REG; |
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} |
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static const struct regmap_config tmp103_regmap_config = { |
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.reg_bits = 8, |
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.val_bits = 8, |
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.max_register = TMP103_THIGH_REG, |
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.volatile_reg = tmp103_regmap_is_volatile, |
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}; |
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static int tmp103_probe(struct i2c_client *client) |
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{ |
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struct device *dev = &client->dev; |
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struct device *hwmon_dev; |
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struct regmap *regmap; |
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int ret; |
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regmap = devm_regmap_init_i2c(client, &tmp103_regmap_config); |
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if (IS_ERR(regmap)) { |
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dev_err(dev, "failed to allocate register map\n"); |
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return PTR_ERR(regmap); |
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} |
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ret = regmap_update_bits(regmap, TMP103_CONF_REG, TMP103_CONFIG_MASK, |
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TMP103_CONFIG); |
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if (ret < 0) { |
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dev_err(&client->dev, "error writing config register\n"); |
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return ret; |
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} |
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i2c_set_clientdata(client, regmap); |
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hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, |
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regmap, |
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&tmp103_chip_info, |
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NULL); |
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return PTR_ERR_OR_ZERO(hwmon_dev); |
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} |
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static int __maybe_unused tmp103_suspend(struct device *dev) |
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{ |
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struct regmap *regmap = dev_get_drvdata(dev); |
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return regmap_update_bits(regmap, TMP103_CONF_REG, |
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TMP103_CONF_SD_MASK, 0); |
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} |
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static int __maybe_unused tmp103_resume(struct device *dev) |
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{ |
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struct regmap *regmap = dev_get_drvdata(dev); |
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return regmap_update_bits(regmap, TMP103_CONF_REG, |
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TMP103_CONF_SD_MASK, TMP103_CONF_SD); |
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} |
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static SIMPLE_DEV_PM_OPS(tmp103_dev_pm_ops, tmp103_suspend, tmp103_resume); |
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static const struct i2c_device_id tmp103_id[] = { |
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{ "tmp103", 0 }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(i2c, tmp103_id); |
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static const struct of_device_id __maybe_unused tmp103_of_match[] = { |
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{ .compatible = "ti,tmp103" }, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(of, tmp103_of_match); |
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static struct i2c_driver tmp103_driver = { |
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.driver = { |
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.name = "tmp103", |
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.of_match_table = of_match_ptr(tmp103_of_match), |
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.pm = &tmp103_dev_pm_ops, |
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}, |
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.probe_new = tmp103_probe, |
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.id_table = tmp103_id, |
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}; |
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module_i2c_driver(tmp103_driver); |
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MODULE_AUTHOR("Heiko Schocher <[email protected]>"); |
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MODULE_DESCRIPTION("Texas Instruments TMP103 temperature sensor driver"); |
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MODULE_LICENSE("GPL");
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