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![Stephen Kitt](/assets/img/avatar_default.png)
Many hwmon drivers don't use the id information provided by the old i2c probe function, and the remainder can easily be adapted to the new form ("probe_new") by calling i2c_match_id explicitly. This avoids scanning the identifier tables during probes. Drivers which didn't use the id are converted as-is; drivers which did are modified as follows: * if the information in i2c_client is sufficient, that's used instead (client->name); * anything else is handled by calling i2c_match_id() with the same level of error-handling (if any) as before. A few drivers aren't included in this patch because they have a different set of maintainers. They will be covered by other patches. Signed-off-by: Stephen Kitt <steve@sk2.org> Link: https://lore.kernel.org/r/20200813160222.1503401-1-steve@sk2.org Signed-off-by: Guenter Roeck <linux@roeck-us.net>
755 lines
20 KiB
C
755 lines
20 KiB
C
// 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 <david.frey@sensirion.com>
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* Author: Pascal Sachs <pascal.sachs@sensirion.com>
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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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/* 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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/* 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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/* 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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/* 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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/* 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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/* 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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#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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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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/* 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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/* 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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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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* 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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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);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return scnprintf(buf, PAGE_SIZE, "%d\n", !!(buffer[0] & 0x04));
|
|
}
|
|
|
|
static ssize_t humidity1_alarm_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
char buffer[SHT3X_WORD_LEN + SHT3X_CRC8_LEN];
|
|
int ret;
|
|
|
|
ret = status_register_read(dev, attr, buffer,
|
|
SHT3X_WORD_LEN + SHT3X_CRC8_LEN);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return scnprintf(buf, PAGE_SIZE, "%d\n", !!(buffer[0] & 0x08));
|
|
}
|
|
|
|
static ssize_t heater_enable_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
char buffer[SHT3X_WORD_LEN + SHT3X_CRC8_LEN];
|
|
int ret;
|
|
|
|
ret = status_register_read(dev, attr, buffer,
|
|
SHT3X_WORD_LEN + SHT3X_CRC8_LEN);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return scnprintf(buf, PAGE_SIZE, "%d\n", !!(buffer[0] & 0x20));
|
|
}
|
|
|
|
static ssize_t heater_enable_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf,
|
|
size_t count)
|
|
{
|
|
struct sht3x_data *data = dev_get_drvdata(dev);
|
|
struct i2c_client *client = data->client;
|
|
int ret;
|
|
bool status;
|
|
|
|
ret = kstrtobool(buf, &status);
|
|
if (ret)
|
|
return ret;
|
|
|
|
mutex_lock(&data->i2c_lock);
|
|
|
|
if (status)
|
|
ret = i2c_master_send(client, (char *)&sht3x_cmd_heater_on,
|
|
SHT3X_CMD_LENGTH);
|
|
else
|
|
ret = i2c_master_send(client, (char *)&sht3x_cmd_heater_off,
|
|
SHT3X_CMD_LENGTH);
|
|
|
|
mutex_unlock(&data->i2c_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t update_interval_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct sht3x_data *data = dev_get_drvdata(dev);
|
|
|
|
return scnprintf(buf, PAGE_SIZE, "%u\n",
|
|
mode_to_update_interval[data->mode]);
|
|
}
|
|
|
|
static ssize_t update_interval_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf,
|
|
size_t count)
|
|
{
|
|
u16 update_interval;
|
|
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 <david.frey@sensirion.com>");
|
|
MODULE_AUTHOR("Pascal Sachs <pascal.sachs@sensirion.com>");
|
|
MODULE_DESCRIPTION("Sensirion SHT3x humidity and temperature sensor driver");
|
|
MODULE_LICENSE("GPL");
|