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314 lines
7.5 KiB
314 lines
7.5 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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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/delay.h> |
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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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#include <linux/of.h> |
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#define DRIVER_NAME "tmp102" |
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#define TMP102_TEMP_REG 0x00 |
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#define TMP102_CONF_REG 0x01 |
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/* note: these bit definitions are byte swapped */ |
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#define TMP102_CONF_SD 0x0100 |
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#define TMP102_CONF_TM 0x0200 |
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#define TMP102_CONF_POL 0x0400 |
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#define TMP102_CONF_F0 0x0800 |
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#define TMP102_CONF_F1 0x1000 |
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#define TMP102_CONF_R0 0x2000 |
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#define TMP102_CONF_R1 0x4000 |
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#define TMP102_CONF_OS 0x8000 |
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#define TMP102_CONF_EM 0x0010 |
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#define TMP102_CONF_AL 0x0020 |
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#define TMP102_CONF_CR0 0x0040 |
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#define TMP102_CONF_CR1 0x0080 |
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#define TMP102_TLOW_REG 0x02 |
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#define TMP102_THIGH_REG 0x03 |
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#define TMP102_CONFREG_MASK (TMP102_CONF_SD | TMP102_CONF_TM | \ |
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TMP102_CONF_POL | TMP102_CONF_F0 | \ |
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TMP102_CONF_F1 | TMP102_CONF_OS | \ |
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TMP102_CONF_EM | TMP102_CONF_AL | \ |
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TMP102_CONF_CR0 | TMP102_CONF_CR1) |
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#define TMP102_CONFIG_CLEAR (TMP102_CONF_SD | TMP102_CONF_OS | \ |
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TMP102_CONF_CR0) |
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#define TMP102_CONFIG_SET (TMP102_CONF_TM | TMP102_CONF_EM | \ |
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TMP102_CONF_CR1) |
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#define CONVERSION_TIME_MS 35 /* in milli-seconds */ |
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struct tmp102 { |
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struct regmap *regmap; |
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u16 config_orig; |
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unsigned long ready_time; |
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}; |
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/* convert left adjusted 13-bit TMP102 register value to milliCelsius */ |
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static inline int tmp102_reg_to_mC(s16 val) |
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{ |
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return ((val & ~0x01) * 1000) / 128; |
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} |
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/* convert milliCelsius to left adjusted 13-bit TMP102 register value */ |
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static inline u16 tmp102_mC_to_reg(int val) |
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{ |
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return (val * 128) / 1000; |
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} |
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static int tmp102_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 tmp102 *tmp102 = 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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/* Is it too early to return a conversion ? */ |
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if (time_before(jiffies, tmp102->ready_time)) { |
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dev_dbg(dev, "%s: Conversion not ready yet..\n", __func__); |
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return -EAGAIN; |
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} |
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reg = TMP102_TEMP_REG; |
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break; |
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case hwmon_temp_max_hyst: |
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reg = TMP102_TLOW_REG; |
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break; |
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case hwmon_temp_max: |
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reg = TMP102_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(tmp102->regmap, reg, ®val); |
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if (err < 0) |
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return err; |
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*temp = tmp102_reg_to_mC(regval); |
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return 0; |
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} |
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static int tmp102_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 tmp102 *tmp102 = dev_get_drvdata(dev); |
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int reg; |
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switch (attr) { |
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case hwmon_temp_max_hyst: |
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reg = TMP102_TLOW_REG; |
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break; |
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case hwmon_temp_max: |
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reg = TMP102_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, -256000, 255000); |
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return regmap_write(tmp102->regmap, reg, tmp102_mC_to_reg(temp)); |
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} |
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static umode_t tmp102_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_max_hyst: |
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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 *tmp102_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_MAX_HYST), |
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NULL |
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}; |
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static const struct hwmon_ops tmp102_hwmon_ops = { |
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.is_visible = tmp102_is_visible, |
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.read = tmp102_read, |
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.write = tmp102_write, |
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}; |
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static const struct hwmon_chip_info tmp102_chip_info = { |
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.ops = &tmp102_hwmon_ops, |
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.info = tmp102_info, |
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}; |
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static void tmp102_restore_config(void *data) |
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{ |
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struct tmp102 *tmp102 = data; |
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regmap_write(tmp102->regmap, TMP102_CONF_REG, tmp102->config_orig); |
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} |
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static bool tmp102_is_writeable_reg(struct device *dev, unsigned int reg) |
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{ |
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return reg != TMP102_TEMP_REG; |
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} |
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static bool tmp102_is_volatile_reg(struct device *dev, unsigned int reg) |
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{ |
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return reg == TMP102_TEMP_REG; |
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} |
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static const struct regmap_config tmp102_regmap_config = { |
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.reg_bits = 8, |
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.val_bits = 16, |
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.max_register = TMP102_THIGH_REG, |
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.writeable_reg = tmp102_is_writeable_reg, |
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.volatile_reg = tmp102_is_volatile_reg, |
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.val_format_endian = REGMAP_ENDIAN_BIG, |
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.cache_type = REGCACHE_RBTREE, |
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.use_single_read = true, |
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.use_single_write = true, |
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}; |
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static int tmp102_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 tmp102 *tmp102; |
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unsigned int regval; |
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int err; |
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if (!i2c_check_functionality(client->adapter, |
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I2C_FUNC_SMBUS_WORD_DATA)) { |
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dev_err(dev, |
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"adapter doesn't support SMBus word transactions\n"); |
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return -ENODEV; |
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} |
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tmp102 = devm_kzalloc(dev, sizeof(*tmp102), GFP_KERNEL); |
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if (!tmp102) |
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return -ENOMEM; |
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i2c_set_clientdata(client, tmp102); |
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tmp102->regmap = devm_regmap_init_i2c(client, &tmp102_regmap_config); |
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if (IS_ERR(tmp102->regmap)) |
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return PTR_ERR(tmp102->regmap); |
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err = regmap_read(tmp102->regmap, TMP102_CONF_REG, ®val); |
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if (err < 0) { |
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dev_err(dev, "error reading config register\n"); |
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return err; |
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} |
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if ((regval & ~TMP102_CONFREG_MASK) != |
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(TMP102_CONF_R0 | TMP102_CONF_R1)) { |
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dev_err(dev, "unexpected config register value\n"); |
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return -ENODEV; |
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} |
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tmp102->config_orig = regval; |
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err = devm_add_action_or_reset(dev, tmp102_restore_config, tmp102); |
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if (err) |
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return err; |
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regval &= ~TMP102_CONFIG_CLEAR; |
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regval |= TMP102_CONFIG_SET; |
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err = regmap_write(tmp102->regmap, TMP102_CONF_REG, regval); |
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if (err < 0) { |
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dev_err(dev, "error writing config register\n"); |
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return err; |
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} |
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/* |
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* Mark that we are not ready with data until the first |
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* conversion is complete |
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*/ |
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tmp102->ready_time = jiffies + msecs_to_jiffies(CONVERSION_TIME_MS); |
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hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, |
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tmp102, |
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&tmp102_chip_info, |
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NULL); |
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if (IS_ERR(hwmon_dev)) { |
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dev_dbg(dev, "unable to register hwmon device\n"); |
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return PTR_ERR(hwmon_dev); |
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} |
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dev_info(dev, "initialized\n"); |
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return 0; |
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} |
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#ifdef CONFIG_PM_SLEEP |
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static int tmp102_suspend(struct device *dev) |
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{ |
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struct i2c_client *client = to_i2c_client(dev); |
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struct tmp102 *tmp102 = i2c_get_clientdata(client); |
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return regmap_update_bits(tmp102->regmap, TMP102_CONF_REG, |
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TMP102_CONF_SD, TMP102_CONF_SD); |
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} |
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static int tmp102_resume(struct device *dev) |
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{ |
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struct i2c_client *client = to_i2c_client(dev); |
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struct tmp102 *tmp102 = i2c_get_clientdata(client); |
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int err; |
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err = regmap_update_bits(tmp102->regmap, TMP102_CONF_REG, |
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TMP102_CONF_SD, 0); |
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tmp102->ready_time = jiffies + msecs_to_jiffies(CONVERSION_TIME_MS); |
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return err; |
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} |
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#endif /* CONFIG_PM */ |
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static SIMPLE_DEV_PM_OPS(tmp102_dev_pm_ops, tmp102_suspend, tmp102_resume); |
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static const struct i2c_device_id tmp102_id[] = { |
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{ "tmp102", 0 }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(i2c, tmp102_id); |
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static const struct of_device_id __maybe_unused tmp102_of_match[] = { |
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{ .compatible = "ti,tmp102" }, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(of, tmp102_of_match); |
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static struct i2c_driver tmp102_driver = { |
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.driver.name = DRIVER_NAME, |
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.driver.of_match_table = of_match_ptr(tmp102_of_match), |
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.driver.pm = &tmp102_dev_pm_ops, |
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.probe_new = tmp102_probe, |
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.id_table = tmp102_id, |
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}; |
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module_i2c_driver(tmp102_driver); |
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MODULE_AUTHOR("Steven King <[email protected]>"); |
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MODULE_DESCRIPTION("Texas Instruments TMP102 temperature sensor driver"); |
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MODULE_LICENSE("GPL");
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