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755 lines
20 KiB
755 lines
20 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* Sensirion SHT3x-DIS humidity and temperature sensor driver. |
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* The SHT3x comes in many different versions, this driver is for the |
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* I2C version only. |
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* |
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* Copyright (C) 2016 Sensirion AG, Switzerland |
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* Author: David Frey <[email protected]> |
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* Author: Pascal Sachs <[email protected]> |
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*/ |
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|
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#include <asm/page.h> |
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#include <linux/crc8.h> |
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#include <linux/delay.h> |
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#include <linux/err.h> |
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#include <linux/hwmon.h> |
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#include <linux/hwmon-sysfs.h> |
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#include <linux/i2c.h> |
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#include <linux/init.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/slab.h> |
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#include <linux/jiffies.h> |
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#include <linux/platform_data/sht3x.h> |
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|
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/* commands (high precision mode) */ |
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static const unsigned char sht3x_cmd_measure_blocking_hpm[] = { 0x2c, 0x06 }; |
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static const unsigned char sht3x_cmd_measure_nonblocking_hpm[] = { 0x24, 0x00 }; |
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|
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/* commands (low power mode) */ |
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static const unsigned char sht3x_cmd_measure_blocking_lpm[] = { 0x2c, 0x10 }; |
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static const unsigned char sht3x_cmd_measure_nonblocking_lpm[] = { 0x24, 0x16 }; |
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|
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/* commands for periodic mode */ |
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static const unsigned char sht3x_cmd_measure_periodic_mode[] = { 0xe0, 0x00 }; |
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static const unsigned char sht3x_cmd_break[] = { 0x30, 0x93 }; |
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|
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/* commands for heater control */ |
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static const unsigned char sht3x_cmd_heater_on[] = { 0x30, 0x6d }; |
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static const unsigned char sht3x_cmd_heater_off[] = { 0x30, 0x66 }; |
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|
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/* other commands */ |
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static const unsigned char sht3x_cmd_read_status_reg[] = { 0xf3, 0x2d }; |
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static const unsigned char sht3x_cmd_clear_status_reg[] = { 0x30, 0x41 }; |
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|
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/* delays for non-blocking i2c commands, both in us */ |
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#define SHT3X_NONBLOCKING_WAIT_TIME_HPM 15000 |
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#define SHT3X_NONBLOCKING_WAIT_TIME_LPM 4000 |
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|
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#define SHT3X_WORD_LEN 2 |
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#define SHT3X_CMD_LENGTH 2 |
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#define SHT3X_CRC8_LEN 1 |
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#define SHT3X_RESPONSE_LENGTH 6 |
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#define SHT3X_CRC8_POLYNOMIAL 0x31 |
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#define SHT3X_CRC8_INIT 0xFF |
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#define SHT3X_MIN_TEMPERATURE -45000 |
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#define SHT3X_MAX_TEMPERATURE 130000 |
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#define SHT3X_MIN_HUMIDITY 0 |
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#define SHT3X_MAX_HUMIDITY 100000 |
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|
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enum sht3x_chips { |
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sht3x, |
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sts3x, |
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}; |
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enum sht3x_limits { |
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limit_max = 0, |
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limit_max_hyst, |
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limit_min, |
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limit_min_hyst, |
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}; |
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DECLARE_CRC8_TABLE(sht3x_crc8_table); |
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|
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/* periodic measure commands (high precision mode) */ |
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static const char periodic_measure_commands_hpm[][SHT3X_CMD_LENGTH] = { |
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/* 0.5 measurements per second */ |
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{0x20, 0x32}, |
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/* 1 measurements per second */ |
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{0x21, 0x30}, |
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/* 2 measurements per second */ |
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{0x22, 0x36}, |
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/* 4 measurements per second */ |
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{0x23, 0x34}, |
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/* 10 measurements per second */ |
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{0x27, 0x37}, |
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}; |
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|
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/* periodic measure commands (low power mode) */ |
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static const char periodic_measure_commands_lpm[][SHT3X_CMD_LENGTH] = { |
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/* 0.5 measurements per second */ |
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{0x20, 0x2f}, |
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/* 1 measurements per second */ |
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{0x21, 0x2d}, |
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/* 2 measurements per second */ |
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{0x22, 0x2b}, |
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/* 4 measurements per second */ |
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{0x23, 0x29}, |
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/* 10 measurements per second */ |
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{0x27, 0x2a}, |
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}; |
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struct sht3x_limit_commands { |
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const char read_command[SHT3X_CMD_LENGTH]; |
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const char write_command[SHT3X_CMD_LENGTH]; |
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}; |
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static const struct sht3x_limit_commands limit_commands[] = { |
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/* temp1_max, humidity1_max */ |
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[limit_max] = { {0xe1, 0x1f}, {0x61, 0x1d} }, |
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/* temp_1_max_hyst, humidity1_max_hyst */ |
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[limit_max_hyst] = { {0xe1, 0x14}, {0x61, 0x16} }, |
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/* temp1_min, humidity1_min */ |
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[limit_min] = { {0xe1, 0x02}, {0x61, 0x00} }, |
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/* temp_1_min_hyst, humidity1_min_hyst */ |
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[limit_min_hyst] = { {0xe1, 0x09}, {0x61, 0x0B} }, |
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}; |
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#define SHT3X_NUM_LIMIT_CMD ARRAY_SIZE(limit_commands) |
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|
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static const u16 mode_to_update_interval[] = { |
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0, |
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2000, |
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1000, |
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500, |
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250, |
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100, |
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}; |
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struct sht3x_data { |
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struct i2c_client *client; |
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struct mutex i2c_lock; /* lock for sending i2c commands */ |
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struct mutex data_lock; /* lock for updating driver data */ |
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u8 mode; |
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const unsigned char *command; |
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u32 wait_time; /* in us*/ |
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unsigned long last_update; /* last update in periodic mode*/ |
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struct sht3x_platform_data setup; |
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|
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/* |
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* cached values for temperature and humidity and limits |
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* the limits arrays have the following order: |
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* max, max_hyst, min, min_hyst |
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*/ |
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int temperature; |
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int temperature_limits[SHT3X_NUM_LIMIT_CMD]; |
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u32 humidity; |
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u32 humidity_limits[SHT3X_NUM_LIMIT_CMD]; |
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}; |
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static u8 get_mode_from_update_interval(u16 value) |
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{ |
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size_t index; |
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u8 number_of_modes = ARRAY_SIZE(mode_to_update_interval); |
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if (value == 0) |
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return 0; |
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/* find next faster update interval */ |
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for (index = 1; index < number_of_modes; index++) { |
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if (mode_to_update_interval[index] <= value) |
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return index; |
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} |
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|
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return number_of_modes - 1; |
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} |
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static int sht3x_read_from_command(struct i2c_client *client, |
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struct sht3x_data *data, |
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const char *command, |
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char *buf, int length, u32 wait_time) |
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{ |
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int ret; |
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mutex_lock(&data->i2c_lock); |
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ret = i2c_master_send(client, command, SHT3X_CMD_LENGTH); |
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if (ret != SHT3X_CMD_LENGTH) { |
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ret = ret < 0 ? ret : -EIO; |
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goto out; |
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} |
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if (wait_time) |
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usleep_range(wait_time, wait_time + 1000); |
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ret = i2c_master_recv(client, buf, length); |
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if (ret != length) { |
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ret = ret < 0 ? ret : -EIO; |
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goto out; |
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} |
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ret = 0; |
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out: |
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mutex_unlock(&data->i2c_lock); |
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return ret; |
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} |
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static int sht3x_extract_temperature(u16 raw) |
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{ |
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/* |
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* From datasheet: |
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* T = -45 + 175 * ST / 2^16 |
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* Adapted for integer fixed point (3 digit) arithmetic. |
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*/ |
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return ((21875 * (int)raw) >> 13) - 45000; |
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} |
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static u32 sht3x_extract_humidity(u16 raw) |
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{ |
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/* |
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* From datasheet: |
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* RH = 100 * SRH / 2^16 |
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* Adapted for integer fixed point (3 digit) arithmetic. |
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*/ |
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return (12500 * (u32)raw) >> 13; |
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} |
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static struct sht3x_data *sht3x_update_client(struct device *dev) |
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{ |
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struct sht3x_data *data = dev_get_drvdata(dev); |
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struct i2c_client *client = data->client; |
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u16 interval_ms = mode_to_update_interval[data->mode]; |
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unsigned long interval_jiffies = msecs_to_jiffies(interval_ms); |
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unsigned char buf[SHT3X_RESPONSE_LENGTH]; |
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u16 val; |
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int ret = 0; |
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mutex_lock(&data->data_lock); |
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/* |
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* Only update cached readings once per update interval in periodic |
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* mode. In single shot mode the sensor measures values on demand, so |
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* every time the sysfs interface is called, a measurement is triggered. |
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* In periodic mode however, the measurement process is handled |
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* internally by the sensor and reading out sensor values only makes |
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* sense if a new reading is available. |
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*/ |
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if (time_after(jiffies, data->last_update + interval_jiffies)) { |
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ret = sht3x_read_from_command(client, data, data->command, buf, |
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sizeof(buf), data->wait_time); |
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if (ret) |
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goto out; |
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val = be16_to_cpup((__be16 *)buf); |
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data->temperature = sht3x_extract_temperature(val); |
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val = be16_to_cpup((__be16 *)(buf + 3)); |
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data->humidity = sht3x_extract_humidity(val); |
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data->last_update = jiffies; |
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} |
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out: |
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mutex_unlock(&data->data_lock); |
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if (ret) |
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return ERR_PTR(ret); |
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return data; |
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} |
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/* sysfs attributes */ |
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static ssize_t temp1_input_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct sht3x_data *data = sht3x_update_client(dev); |
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if (IS_ERR(data)) |
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return PTR_ERR(data); |
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return sprintf(buf, "%d\n", data->temperature); |
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} |
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static ssize_t humidity1_input_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct sht3x_data *data = sht3x_update_client(dev); |
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if (IS_ERR(data)) |
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return PTR_ERR(data); |
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return sprintf(buf, "%u\n", data->humidity); |
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} |
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/* |
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* limits_update must only be called from probe or with data_lock held |
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*/ |
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static int limits_update(struct sht3x_data *data) |
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{ |
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int ret; |
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u8 index; |
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int temperature; |
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u32 humidity; |
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u16 raw; |
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char buffer[SHT3X_RESPONSE_LENGTH]; |
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const struct sht3x_limit_commands *commands; |
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struct i2c_client *client = data->client; |
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for (index = 0; index < SHT3X_NUM_LIMIT_CMD; index++) { |
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commands = &limit_commands[index]; |
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ret = sht3x_read_from_command(client, data, |
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commands->read_command, buffer, |
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SHT3X_RESPONSE_LENGTH, 0); |
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if (ret) |
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return ret; |
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raw = be16_to_cpup((__be16 *)buffer); |
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temperature = sht3x_extract_temperature((raw & 0x01ff) << 7); |
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humidity = sht3x_extract_humidity(raw & 0xfe00); |
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data->temperature_limits[index] = temperature; |
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data->humidity_limits[index] = humidity; |
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} |
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return ret; |
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} |
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static ssize_t temp1_limit_show(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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struct sht3x_data *data = dev_get_drvdata(dev); |
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u8 index = to_sensor_dev_attr(attr)->index; |
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int temperature_limit = data->temperature_limits[index]; |
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return scnprintf(buf, PAGE_SIZE, "%d\n", temperature_limit); |
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} |
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static ssize_t humidity1_limit_show(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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struct sht3x_data *data = dev_get_drvdata(dev); |
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u8 index = to_sensor_dev_attr(attr)->index; |
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u32 humidity_limit = data->humidity_limits[index]; |
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return scnprintf(buf, PAGE_SIZE, "%u\n", humidity_limit); |
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} |
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/* |
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* limit_store must only be called with data_lock held |
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*/ |
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static size_t limit_store(struct device *dev, |
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size_t count, |
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u8 index, |
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int temperature, |
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u32 humidity) |
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{ |
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char buffer[SHT3X_CMD_LENGTH + SHT3X_WORD_LEN + SHT3X_CRC8_LEN]; |
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char *position = buffer; |
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int ret; |
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u16 raw; |
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struct sht3x_data *data = dev_get_drvdata(dev); |
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struct i2c_client *client = data->client; |
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const struct sht3x_limit_commands *commands; |
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commands = &limit_commands[index]; |
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memcpy(position, commands->write_command, SHT3X_CMD_LENGTH); |
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position += SHT3X_CMD_LENGTH; |
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/* |
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* ST = (T + 45) / 175 * 2^16 |
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* SRH = RH / 100 * 2^16 |
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* adapted for fixed point arithmetic and packed the same as |
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* in limit_show() |
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*/ |
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raw = ((u32)(temperature + 45000) * 24543) >> (16 + 7); |
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raw |= ((humidity * 42950) >> 16) & 0xfe00; |
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*((__be16 *)position) = cpu_to_be16(raw); |
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position += SHT3X_WORD_LEN; |
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*position = crc8(sht3x_crc8_table, |
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position - SHT3X_WORD_LEN, |
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SHT3X_WORD_LEN, |
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SHT3X_CRC8_INIT); |
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mutex_lock(&data->i2c_lock); |
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ret = i2c_master_send(client, buffer, sizeof(buffer)); |
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mutex_unlock(&data->i2c_lock); |
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if (ret != sizeof(buffer)) |
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return ret < 0 ? ret : -EIO; |
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data->temperature_limits[index] = temperature; |
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data->humidity_limits[index] = humidity; |
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return count; |
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} |
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static ssize_t temp1_limit_store(struct device *dev, |
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struct device_attribute *attr, |
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const char *buf, |
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size_t count) |
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{ |
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int temperature; |
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int ret; |
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struct sht3x_data *data = dev_get_drvdata(dev); |
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u8 index = to_sensor_dev_attr(attr)->index; |
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ret = kstrtoint(buf, 0, &temperature); |
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if (ret) |
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return ret; |
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temperature = clamp_val(temperature, SHT3X_MIN_TEMPERATURE, |
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SHT3X_MAX_TEMPERATURE); |
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mutex_lock(&data->data_lock); |
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ret = limit_store(dev, count, index, temperature, |
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data->humidity_limits[index]); |
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mutex_unlock(&data->data_lock); |
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return ret; |
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} |
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static ssize_t humidity1_limit_store(struct device *dev, |
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struct device_attribute *attr, |
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const char *buf, |
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size_t count) |
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{ |
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u32 humidity; |
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int ret; |
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struct sht3x_data *data = dev_get_drvdata(dev); |
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u8 index = to_sensor_dev_attr(attr)->index; |
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ret = kstrtou32(buf, 0, &humidity); |
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if (ret) |
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return ret; |
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humidity = clamp_val(humidity, SHT3X_MIN_HUMIDITY, SHT3X_MAX_HUMIDITY); |
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mutex_lock(&data->data_lock); |
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ret = limit_store(dev, count, index, data->temperature_limits[index], |
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humidity); |
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mutex_unlock(&data->data_lock); |
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return ret; |
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} |
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static void sht3x_select_command(struct sht3x_data *data) |
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{ |
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/* |
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* In blocking mode (clock stretching mode) the I2C bus |
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* is blocked for other traffic, thus the call to i2c_master_recv() |
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* will wait until the data is ready. For non blocking mode, we |
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* have to wait ourselves. |
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*/ |
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if (data->mode > 0) { |
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data->command = sht3x_cmd_measure_periodic_mode; |
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data->wait_time = 0; |
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} else if (data->setup.blocking_io) { |
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data->command = data->setup.high_precision ? |
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sht3x_cmd_measure_blocking_hpm : |
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sht3x_cmd_measure_blocking_lpm; |
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data->wait_time = 0; |
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} else { |
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if (data->setup.high_precision) { |
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data->command = sht3x_cmd_measure_nonblocking_hpm; |
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data->wait_time = SHT3X_NONBLOCKING_WAIT_TIME_HPM; |
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} else { |
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data->command = sht3x_cmd_measure_nonblocking_lpm; |
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data->wait_time = SHT3X_NONBLOCKING_WAIT_TIME_LPM; |
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} |
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} |
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} |
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static int status_register_read(struct device *dev, |
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struct device_attribute *attr, |
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char *buffer, int length) |
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{ |
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int ret; |
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struct sht3x_data *data = dev_get_drvdata(dev); |
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struct i2c_client *client = data->client; |
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ret = sht3x_read_from_command(client, data, sht3x_cmd_read_status_reg, |
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buffer, length, 0); |
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return ret; |
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} |
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static ssize_t temp1_alarm_show(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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char buffer[SHT3X_WORD_LEN + SHT3X_CRC8_LEN]; |
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int ret; |
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ret = status_register_read(dev, attr, buffer, |
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SHT3X_WORD_LEN + SHT3X_CRC8_LEN); |
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if (ret) |
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return ret; |
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return scnprintf(buf, PAGE_SIZE, "%d\n", !!(buffer[0] & 0x04)); |
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} |
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static ssize_t humidity1_alarm_show(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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char buffer[SHT3X_WORD_LEN + SHT3X_CRC8_LEN]; |
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int ret; |
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ret = status_register_read(dev, attr, buffer, |
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SHT3X_WORD_LEN + SHT3X_CRC8_LEN); |
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if (ret) |
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return ret; |
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return scnprintf(buf, PAGE_SIZE, "%d\n", !!(buffer[0] & 0x08)); |
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} |
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static ssize_t heater_enable_show(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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char buffer[SHT3X_WORD_LEN + SHT3X_CRC8_LEN]; |
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int ret; |
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ret = status_register_read(dev, attr, buffer, |
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SHT3X_WORD_LEN + SHT3X_CRC8_LEN); |
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if (ret) |
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return ret; |
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return scnprintf(buf, PAGE_SIZE, "%d\n", !!(buffer[0] & 0x20)); |
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} |
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static ssize_t heater_enable_store(struct device *dev, |
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struct device_attribute *attr, |
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const char *buf, |
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size_t count) |
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{ |
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struct sht3x_data *data = dev_get_drvdata(dev); |
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struct i2c_client *client = data->client; |
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int ret; |
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bool status; |
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ret = kstrtobool(buf, &status); |
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if (ret) |
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return ret; |
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mutex_lock(&data->i2c_lock); |
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if (status) |
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ret = i2c_master_send(client, (char *)&sht3x_cmd_heater_on, |
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SHT3X_CMD_LENGTH); |
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else |
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ret = i2c_master_send(client, (char *)&sht3x_cmd_heater_off, |
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SHT3X_CMD_LENGTH); |
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mutex_unlock(&data->i2c_lock); |
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return ret; |
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} |
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static ssize_t update_interval_show(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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struct sht3x_data *data = dev_get_drvdata(dev); |
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|
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return scnprintf(buf, PAGE_SIZE, "%u\n", |
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mode_to_update_interval[data->mode]); |
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} |
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|
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static ssize_t update_interval_store(struct device *dev, |
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struct device_attribute *attr, |
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const char *buf, |
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size_t count) |
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{ |
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u16 update_interval; |
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u8 mode; |
|
int ret; |
|
const char *command; |
|
struct sht3x_data *data = dev_get_drvdata(dev); |
|
struct i2c_client *client = data->client; |
|
|
|
ret = kstrtou16(buf, 0, &update_interval); |
|
if (ret) |
|
return ret; |
|
|
|
mode = get_mode_from_update_interval(update_interval); |
|
|
|
mutex_lock(&data->data_lock); |
|
/* mode did not change */ |
|
if (mode == data->mode) { |
|
mutex_unlock(&data->data_lock); |
|
return count; |
|
} |
|
|
|
mutex_lock(&data->i2c_lock); |
|
/* |
|
* Abort periodic measure mode. |
|
* To do any changes to the configuration while in periodic mode, we |
|
* have to send a break command to the sensor, which then falls back |
|
* to single shot (mode = 0). |
|
*/ |
|
if (data->mode > 0) { |
|
ret = i2c_master_send(client, sht3x_cmd_break, |
|
SHT3X_CMD_LENGTH); |
|
if (ret != SHT3X_CMD_LENGTH) |
|
goto out; |
|
data->mode = 0; |
|
} |
|
|
|
if (mode > 0) { |
|
if (data->setup.high_precision) |
|
command = periodic_measure_commands_hpm[mode - 1]; |
|
else |
|
command = periodic_measure_commands_lpm[mode - 1]; |
|
|
|
/* select mode */ |
|
ret = i2c_master_send(client, command, SHT3X_CMD_LENGTH); |
|
if (ret != SHT3X_CMD_LENGTH) |
|
goto out; |
|
} |
|
|
|
/* select mode and command */ |
|
data->mode = mode; |
|
sht3x_select_command(data); |
|
|
|
out: |
|
mutex_unlock(&data->i2c_lock); |
|
mutex_unlock(&data->data_lock); |
|
if (ret != SHT3X_CMD_LENGTH) |
|
return ret < 0 ? ret : -EIO; |
|
|
|
return count; |
|
} |
|
|
|
static SENSOR_DEVICE_ATTR_RO(temp1_input, temp1_input, 0); |
|
static SENSOR_DEVICE_ATTR_RO(humidity1_input, humidity1_input, 0); |
|
static SENSOR_DEVICE_ATTR_RW(temp1_max, temp1_limit, limit_max); |
|
static SENSOR_DEVICE_ATTR_RW(humidity1_max, humidity1_limit, limit_max); |
|
static SENSOR_DEVICE_ATTR_RW(temp1_max_hyst, temp1_limit, limit_max_hyst); |
|
static SENSOR_DEVICE_ATTR_RW(humidity1_max_hyst, humidity1_limit, |
|
limit_max_hyst); |
|
static SENSOR_DEVICE_ATTR_RW(temp1_min, temp1_limit, limit_min); |
|
static SENSOR_DEVICE_ATTR_RW(humidity1_min, humidity1_limit, limit_min); |
|
static SENSOR_DEVICE_ATTR_RW(temp1_min_hyst, temp1_limit, limit_min_hyst); |
|
static SENSOR_DEVICE_ATTR_RW(humidity1_min_hyst, humidity1_limit, |
|
limit_min_hyst); |
|
static SENSOR_DEVICE_ATTR_RO(temp1_alarm, temp1_alarm, 0); |
|
static SENSOR_DEVICE_ATTR_RO(humidity1_alarm, humidity1_alarm, 0); |
|
static SENSOR_DEVICE_ATTR_RW(heater_enable, heater_enable, 0); |
|
static SENSOR_DEVICE_ATTR_RW(update_interval, update_interval, 0); |
|
|
|
static struct attribute *sht3x_attrs[] = { |
|
&sensor_dev_attr_temp1_input.dev_attr.attr, |
|
&sensor_dev_attr_humidity1_input.dev_attr.attr, |
|
&sensor_dev_attr_temp1_max.dev_attr.attr, |
|
&sensor_dev_attr_temp1_max_hyst.dev_attr.attr, |
|
&sensor_dev_attr_humidity1_max.dev_attr.attr, |
|
&sensor_dev_attr_humidity1_max_hyst.dev_attr.attr, |
|
&sensor_dev_attr_temp1_min.dev_attr.attr, |
|
&sensor_dev_attr_temp1_min_hyst.dev_attr.attr, |
|
&sensor_dev_attr_humidity1_min.dev_attr.attr, |
|
&sensor_dev_attr_humidity1_min_hyst.dev_attr.attr, |
|
&sensor_dev_attr_temp1_alarm.dev_attr.attr, |
|
&sensor_dev_attr_humidity1_alarm.dev_attr.attr, |
|
&sensor_dev_attr_heater_enable.dev_attr.attr, |
|
&sensor_dev_attr_update_interval.dev_attr.attr, |
|
NULL |
|
}; |
|
|
|
static struct attribute *sts3x_attrs[] = { |
|
&sensor_dev_attr_temp1_input.dev_attr.attr, |
|
NULL |
|
}; |
|
|
|
ATTRIBUTE_GROUPS(sht3x); |
|
ATTRIBUTE_GROUPS(sts3x); |
|
|
|
static const struct i2c_device_id sht3x_ids[]; |
|
|
|
static int sht3x_probe(struct i2c_client *client) |
|
{ |
|
int ret; |
|
struct sht3x_data *data; |
|
struct device *hwmon_dev; |
|
struct i2c_adapter *adap = client->adapter; |
|
struct device *dev = &client->dev; |
|
const struct attribute_group **attribute_groups; |
|
|
|
/* |
|
* we require full i2c support since the sht3x uses multi-byte read and |
|
* writes as well as multi-byte commands which are not supported by |
|
* the smbus protocol |
|
*/ |
|
if (!i2c_check_functionality(adap, I2C_FUNC_I2C)) |
|
return -ENODEV; |
|
|
|
ret = i2c_master_send(client, sht3x_cmd_clear_status_reg, |
|
SHT3X_CMD_LENGTH); |
|
if (ret != SHT3X_CMD_LENGTH) |
|
return ret < 0 ? ret : -ENODEV; |
|
|
|
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); |
|
if (!data) |
|
return -ENOMEM; |
|
|
|
data->setup.blocking_io = false; |
|
data->setup.high_precision = true; |
|
data->mode = 0; |
|
data->last_update = jiffies - msecs_to_jiffies(3000); |
|
data->client = client; |
|
crc8_populate_msb(sht3x_crc8_table, SHT3X_CRC8_POLYNOMIAL); |
|
|
|
if (client->dev.platform_data) |
|
data->setup = *(struct sht3x_platform_data *)dev->platform_data; |
|
|
|
sht3x_select_command(data); |
|
|
|
mutex_init(&data->i2c_lock); |
|
mutex_init(&data->data_lock); |
|
|
|
/* |
|
* An attempt to read limits register too early |
|
* causes a NACK response from the chip. |
|
* Waiting for an empirical delay of 500 us solves the issue. |
|
*/ |
|
usleep_range(500, 600); |
|
|
|
ret = limits_update(data); |
|
if (ret) |
|
return ret; |
|
|
|
if (i2c_match_id(sht3x_ids, client)->driver_data == sts3x) |
|
attribute_groups = sts3x_groups; |
|
else |
|
attribute_groups = sht3x_groups; |
|
|
|
hwmon_dev = devm_hwmon_device_register_with_groups(dev, |
|
client->name, |
|
data, |
|
attribute_groups); |
|
|
|
if (IS_ERR(hwmon_dev)) |
|
dev_dbg(dev, "unable to register hwmon device\n"); |
|
|
|
return PTR_ERR_OR_ZERO(hwmon_dev); |
|
} |
|
|
|
/* device ID table */ |
|
static const struct i2c_device_id sht3x_ids[] = { |
|
{"sht3x", sht3x}, |
|
{"sts3x", sts3x}, |
|
{} |
|
}; |
|
|
|
MODULE_DEVICE_TABLE(i2c, sht3x_ids); |
|
|
|
static struct i2c_driver sht3x_i2c_driver = { |
|
.driver.name = "sht3x", |
|
.probe_new = sht3x_probe, |
|
.id_table = sht3x_ids, |
|
}; |
|
|
|
module_i2c_driver(sht3x_i2c_driver); |
|
|
|
MODULE_AUTHOR("David Frey <[email protected]>"); |
|
MODULE_AUTHOR("Pascal Sachs <[email protected]>"); |
|
MODULE_DESCRIPTION("Sensirion SHT3x humidity and temperature sensor driver"); |
|
MODULE_LICENSE("GPL");
|
|
|