Messages in this thread | | | Subject | Re: [PATCH 1/1 v3] hwmon: add support for Sensirion SHT3x sensors | From | Guenter Roeck <> | Date | Sun, 29 May 2016 09:06:22 -0700 |
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On 05/26/2016 12:25 AM, Pascal Sachs wrote: > From: David Frey <david.frey@sensirion.com> > > This driver implements support for the Sensirion SHT3x-DIS chip, > a humidity and temperature sensor. Temperature is measured > in degrees celsius, relative humidity is expressed as a percentage. > In the sysfs interface, all values are scaled by 1000, > i.e. the value for 31.5 degrees celsius is 31500. > > Signed-off-by: Pascal Sachs <pascal.sachs@sensirion.com> > --- > Patch was generated against kernel v4.6-rc7
Another note: Please Cc: linux-hwmon@vger.kernel.org; that makes it easier for me to track your patches.
Thanks, Guenter
> > Documentation/hwmon/sht3x | 72 ++++ > drivers/hwmon/Kconfig | 11 + > drivers/hwmon/Makefile | 1 + > drivers/hwmon/sht3x.c | 701 ++++++++++++++++++++++++++++++++++++ > include/linux/platform_data/sht3x.h | 25 ++ > 5 files changed, 810 insertions(+) > create mode 100644 Documentation/hwmon/sht3x > create mode 100644 drivers/hwmon/sht3x.c > create mode 100644 include/linux/platform_data/sht3x.h > > diff --git a/Documentation/hwmon/sht3x b/Documentation/hwmon/sht3x > new file mode 100644 > index 0000000..f5aa633 > --- /dev/null > +++ b/Documentation/hwmon/sht3x > @@ -0,0 +1,72 @@ > +Kernel driver sht3x > +=================== > + > +Supported chips: > + * Sensirion SHT3x-DIS > + Prefix: 'sht3x' > + Addresses scanned: none > + Datasheet: http://www.sensirion.com/fileadmin/user_upload/customers/sensirion/Dokumente/Humidity/Sensirion_Humidity_Datasheet_SHT3x_DIS.pdf > + > +Author: > + David Frey <david.frey@sensirion.com> > + Pascal Sachs <pascal.sachs@sensirion.com> > + > +Description > +----------- > + > +This driver implements support for the Sensirion SHT3x-DIS chip, a humidity > +and temperature sensor. Temperature is measured in degrees celsius, relative > +humidity is expressed as a percentage. In the sysfs interface, all values are > +scaled by 1000, i.e. the value for 31.5 degrees celsius is 31500. > + > +The device communicates with the I2C protocol. Sensors can have the I2C > +addresses 0x44 or 0x45, depending on the wiring. See > +Documentation/i2c/instantiating-devices for methods to instantiate the device. > + > +There are two options configurable by means of sht3x_platform_data: > +1. blocking (pull the I2C clock line down while performing the measurement) or > + non-blocking mode. Blocking mode will guarantee the fastest result but > + the I2C bus will be busy during that time. By default, non-blocking mode > + is used. Make sure clock-stretching works properly on your device if you > + want to use blocking mode. > +2. high or low accuracy. High accuracy is used by default and using it is > + strongly recommended. > + > +The sht3x sensor supports a single shot mode as well as 5 periodic measure > +modes, which can be controlled with the update_interval sysfs interface. > +The allowed update_interval in milliseconds are as follows: > + * 0 single shot mode > + * 2000 0.5 Hz periodic measurement > + * 1000 1 Hz periodic measurement > + * 500 2 Hz periodic measurement > + * 250 4 Hz periodic measurement > + * 100 10 Hz periodic measurement > + > +In the periodic measure mode, the sensor automatically triggers a measurement > +with the configured update interval on the chip. When a temperature or humidity > +reading exceeds the configured limits, the alert attribute is set to 1 and > +the alert pin on the sensor is set to high. > +When the temperature and humidity readings move back between the hysteresis > +values, the alert bit is set to 0 and the alert pin on the sensor is set to > +low. > + > +sysfs-Interface > +--------------- > + > +temp1_input: temperature input > +humidity1_input: humidity input > +temp1_max: temperature max value > +temp1_max_hyst: temperature hysteresis value for max limit > +humidity1_max: humidity max value > +humidity1_max_hyst: humidity hysteresis value for max limit > +temp1_min: temperature min value > +temp1_min_hyst: temperature hysteresis value for min limit > +humidity1_min: humidity min value > +humidity1_min_hyst: humidity hysteresis value for min limit > +temp1_alarm: alarm flag is set to 1 if the temperature is outside the > + configured limits. Alarm only works in periodic measure mode > +humidity1_alarm: alarm flag is set to 1 if the humidity is outside the > + configured limits. Alarm only works in periodic measure mode > +update_interval: update interval, 0 for single shot, interval in msec > + for periodic measurement. If the interval is not supported > + by the sensor, the next faster interval is chosen > diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig > index 5c2d13a..222c483 100644 > --- a/drivers/hwmon/Kconfig > +++ b/drivers/hwmon/Kconfig > @@ -1254,6 +1254,17 @@ config SENSORS_SHT21 > This driver can also be built as a module. If so, the module > will be called sht21. > > +config SENSORS_SHT3x > + tristate "Sensiron humidity and temperature sensors. SHT3x and compat." > + depends on I2C > + select CRC8 > + help > + If you say yes here you get support for the Sensiron SHT30 and SHT31 > + humidity and temperature sensors. > + > + This driver can also be built as a module. If so, the module > + will be called sht3x. > + > config SENSORS_SHTC1 > tristate "Sensiron humidity and temperature sensors. SHTC1 and compat." > depends on I2C > diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile > index 58cc3ac..999ff2d 100644 > --- a/drivers/hwmon/Makefile > +++ b/drivers/hwmon/Makefile > @@ -137,6 +137,7 @@ obj-$(CONFIG_SENSORS_SCH5627) += sch5627.o > obj-$(CONFIG_SENSORS_SCH5636) += sch5636.o > obj-$(CONFIG_SENSORS_SHT15) += sht15.o > obj-$(CONFIG_SENSORS_SHT21) += sht21.o > +obj-$(CONFIG_SENSORS_SHT3x) += sht3x.o > obj-$(CONFIG_SENSORS_SHTC1) += shtc1.o > obj-$(CONFIG_SENSORS_SIS5595) += sis5595.o > obj-$(CONFIG_SENSORS_SMM665) += smm665.o > diff --git a/drivers/hwmon/sht3x.c b/drivers/hwmon/sht3x.c > new file mode 100644 > index 0000000..a3d2130 > --- /dev/null > +++ b/drivers/hwmon/sht3x.c > @@ -0,0 +1,701 @@ > +/* Sensirion SHT3x-DIS humidity and temperature sensor driver. > + * The SHT3x comes in many different versions, this driver is for the > + * I2C version only. > + * > + * Copyright (C) 2016 Sensirion AG, Switzerland > + * Author: David Frey <david.frey@sensirion.com> > + * Author: Pascal Sachs <pascal.sachs@sensirion.com> > + * > + * This program is free software; you can redistribute it and/or modify > + * it under the terms of the GNU General Public License as published by > + * the Free Software Foundation; either version 2 of the License, or > + * (at your option) any later version. > + * > + * This program is distributed in the hope that it will be useful, > + * but WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > + * GNU General Public License for more details. > + * > + */ > + > +#include <asm/page.h> > +#include <linux/crc8.h> > +#include <linux/delay.h> > +#include <linux/err.h> > +#include <linux/hwmon.h> > +#include <linux/hwmon-sysfs.h> > +#include <linux/i2c.h> > +#include <linux/init.h> > +#include <linux/kernel.h> > +#include <linux/module.h> > +#include <linux/slab.h> > +#include <linux/jiffies.h> > +#include <linux/platform_data/sht3x.h> > + > +/* commands (high precision mode) */ > +static const unsigned char sht3x_cmd_measure_blocking_hpm[] = { 0x2c, 0x06 }; > +static const unsigned char sht3x_cmd_measure_nonblocking_hpm[] = { 0x24, 0x00 }; > + > +/* commands (low power mode) */ > +static const unsigned char sht3x_cmd_measure_blocking_lpm[] = { 0x2c, 0x10 }; > +static const unsigned char sht3x_cmd_measure_nonblocking_lpm[] = { 0x24, 0x16 }; > + > +/* commands for periodic mode */ > +static const unsigned char sht3x_cmd_measure_periodic_mode[] = { 0xe0, 0x00 }; > +static const unsigned char sht3x_cmd_break[] = { 0x30, 0x93 }; > + > +/* other commands */ > +static const unsigned char sht3x_cmd_read_status_reg[] = { 0xf3, 0x2d }; > +static const unsigned char sht3x_cmd_clear_status_reg[] = { 0x30, 0x41 }; > + > +/* delays for non-blocking i2c commands, both in us */ > +#define SHT3X_NONBLOCKING_WAIT_TIME_HPM 15000 > +#define SHT3X_NONBLOCKING_WAIT_TIME_LPM 4000 > + > +#define SHT3X_WORD_LEN 2 > +#define SHT3X_CMD_LENGTH 2 > +#define SHT3X_CRC8_LEN 1 > +#define SHT3X_RESPONSE_LENGTH 6 > +#define SHT3X_CRC8_POLYNOMIAL 0x31 > +#define SHT3X_CRC8_INIT 0xFF > + > +enum sht3x_chips { > + sht3x, > + sts3x, > +}; > + > +DECLARE_CRC8_TABLE(sht3x_crc8_table); > + > +/* periodic measure commands (high precision mode) */ > +static const char periodic_measure_commands_hpm[][SHT3X_CMD_LENGTH] = { > + /* 0.5 measurements per second */ > + {0x20, 0x32}, > + /* 1 measurements per second */ > + {0x21, 0x30}, > + /* 2 measurements per second */ > + {0x22, 0x36}, > + /* 4 measurements per second */ > + {0x23, 0x34}, > + /* 10 measurements per second */ > + {0x27, 0x37}, > +}; > + > +/* periodic measure commands (low power mode) */ > +static const char periodic_measure_commands_lpm[][SHT3X_CMD_LENGTH] = { > + /* 0.5 measurements per second */ > + {0x20, 0x2f}, > + /* 1 measurements per second */ > + {0x21, 0x2d}, > + /* 2 measurements per second */ > + {0x22, 0x2b}, > + /* 4 measurements per second */ > + {0x23, 0x29}, > + /* 10 measurements per second */ > + {0x27, 0x2a}, > +}; > + > +struct sht3x_limit_commands { > + const char read_command[SHT3X_CMD_LENGTH]; > + const char write_command[SHT3X_CMD_LENGTH]; > +}; > + > +static const struct sht3x_limit_commands limit_commands[] = { > + /* temp1_max, humidity1_max */ > + { {0xe1, 0x1f}, {0x61, 0x1d} }, > + /* temp_1_max_hyst, humidity1_max_hyst */ > + { {0xe1, 0x14}, {0x61, 0x16} }, > + /* temp1_min, humidity1_min */ > + { {0xe1, 0x02}, {0x61, 0x00} }, > + /* temp_1_min_hyst, humidity1_min_hyst */ > + { {0xe1, 0x09}, {0x61, 0x0B} }, > +}; > + > +#define SHT3X_NUM_LIMIT_CMD ARRAY_SIZE(limit_commands) > + > +static const u16 mode_to_update_interval[] = { > + 0, > + 2000, > + 1000, > + 500, > + 250, > + 100, > +}; > + > +struct sht3x_data { > + struct i2c_client *client; > + struct mutex i2c_lock; /* lock for sending i2c commands */ > + struct mutex data_lock; /* lock for updating driver data */ > + > + u8 mode; > + const unsigned char *command; > + u32 wait_time; /* in us*/ > + unsigned long last_update; /* last update in periodic mode*/ > + > + struct sht3x_platform_data setup; > + > + /* > + * cached values for temperature and humidity and limits > + * the limits arrays have the following order: > + * max, max_hyst, min, min_hyst > + */ > + int temperature; > + int temperature_limits[SHT3X_NUM_LIMIT_CMD]; > + u32 humidity; > + u32 humidity_limits[SHT3X_NUM_LIMIT_CMD]; > +}; > + > +static u8 get_mode_from_update_interval(u16 value) > +{ > + size_t index; > + u8 number_of_modes = ARRAY_SIZE(mode_to_update_interval); > + > + if (value == 0) > + return 0; > + > + /* find next faster update interval */ > + for (index = 1; index < number_of_modes; index++) { > + if (mode_to_update_interval[index] <= value) > + return index; > + } > + > + return number_of_modes - 1; > +} > + > +static int sht3x_read_from_command(struct i2c_client *client, > + struct sht3x_data *data, > + const char *command, > + char *buf, int length, u32 wait_time) > +{ > + int ret; > + > + mutex_lock(&data->i2c_lock); > + ret = i2c_master_send(client, command, SHT3X_CMD_LENGTH); > + > + if (ret != SHT3X_CMD_LENGTH) { > + ret = ret < 0 ? ret : -EIO; > + goto out; > + } > + > + if (wait_time) > + usleep_range(wait_time, wait_time + 1000); > + > + ret = i2c_master_recv(client, buf, length); > + if (ret != length) { > + ret = ret < 0 ? ret : -EIO; > + goto out; > + } > + > + ret = 0; > +out: > + mutex_unlock(&data->i2c_lock); > + return ret; > +} > + > +static int sht3x_extract_temperature(u16 raw) > +{ > + /* > + * From datasheet: > + * T = -45 + 175 * ST / 2^16 > + * Adapted for integer fixed point (3 digit) arithmetic. > + */ > + return ((21875 * (int)raw) >> 13) - 45000; > +} > + > +static u32 sht3x_extract_humidity(u16 raw) > +{ > + /* > + * From datasheet: > + * RH = 100 * SRH / 2^16 > + * Adapted for integer fixed point (3 digit) arithmetic. > + */ > + return (12500 * (int)raw) >> 13; > +} > + > +static struct sht3x_data *sht3x_update_client(struct device *dev) > +{ > + struct sht3x_data *data = dev_get_drvdata(dev); > + struct i2c_client *client = data->client; > + u16 interval_ms = mode_to_update_interval[data->mode]; > + unsigned long interval_jiffies = msecs_to_jiffies(interval_ms); > + unsigned char buf[SHT3X_RESPONSE_LENGTH]; > + u16 val; > + int ret; > + > + /* only update once per interval in periodic mode */ > + if (time_after(jiffies, data->last_update + interval_jiffies)) { > + ret = sht3x_read_from_command(client, data, data->command, buf, > + sizeof(buf), data->wait_time); > + if (ret) > + return ERR_PTR(ret); > + > + mutex_lock(&data->data_lock); > + val = be16_to_cpup((__be16 *)buf); > + data->temperature = sht3x_extract_temperature(val); > + val = be16_to_cpup((__be16 *)(buf + 3)); > + data->humidity = sht3x_extract_humidity(val); > + data->last_update = jiffies; > + mutex_unlock(&data->data_lock); > + } > + > + return data; > +} > + > +/* sysfs attributes */ > +static ssize_t temp1_input_show(struct device *dev, > + struct device_attribute *attr, char *buf) > +{ > + struct sht3x_data *data = sht3x_update_client(dev); > + > + if (IS_ERR(data)) > + return PTR_ERR(data); > + > + return sprintf(buf, "%d\n", data->temperature); > +} > + > +static ssize_t humidity1_input_show(struct device *dev, > + struct device_attribute *attr, char *buf) > +{ > + struct sht3x_data *data = sht3x_update_client(dev); > + > + if (IS_ERR(data)) > + return PTR_ERR(data); > + > + return sprintf(buf, "%d\n", data->humidity); > +} > + > +static int limits_update(struct sht3x_data *data) > +{ > + int ret; > + u8 index; > + int temperature; > + u32 humidity; > + u16 raw; > + char buffer[SHT3X_RESPONSE_LENGTH]; > + const struct sht3x_limit_commands *commands; > + struct i2c_client *client = data->client; > + > + for (index = 0; index < SHT3X_NUM_LIMIT_CMD; index++) { > + commands = &limit_commands[index]; > + ret = sht3x_read_from_command(client, data, > + commands->read_command, buffer, > + SHT3X_RESPONSE_LENGTH, 0); > + > + if (ret) > + return ret; > + > + raw = be16_to_cpup((__be16 *)buffer); > + temperature = sht3x_extract_temperature((raw & 0x01ff) << 7); > + humidity = sht3x_extract_humidity(raw & 0xfe00); > + mutex_lock(&data->data_lock); > + data->temperature_limits[index] = temperature; > + data->humidity_limits[index] = humidity; > + mutex_unlock(&data->data_lock); > + } > + > + return ret; > +} > + > +static ssize_t temp1_limit_show(struct device *dev, > + struct device_attribute *attr, > + char *buf) > +{ > + int temperature_limit; > + u8 index; > + struct sht3x_data *data = dev_get_drvdata(dev); > + > + index = to_sensor_dev_attr(attr)->index; > + temperature_limit = data->temperature_limits[index]; > + > + return scnprintf(buf, PAGE_SIZE, "%d\n", temperature_limit); > +} > + > +static ssize_t humidity1_limit_show(struct device *dev, > + struct device_attribute *attr, > + char *buf) > +{ > + int humidity_limit; > + u8 index; > + struct sht3x_data *data = dev_get_drvdata(dev); > + > + index = to_sensor_dev_attr(attr)->index; > + humidity_limit = data->humidity_limits[index]; > + > + return scnprintf(buf, PAGE_SIZE, "%d\n", humidity_limit); > +} > + > +static size_t limit_store(struct device *dev, > + struct device_attribute *attr, > + size_t count, > + int temperature, > + u32 humidity) > +{ > + char buffer[SHT3X_CMD_LENGTH + SHT3X_WORD_LEN + SHT3X_CRC8_LEN]; > + char *position = buffer; > + int ret; > + u16 raw; > + u8 index; > + struct sht3x_data *data = dev_get_drvdata(dev); > + struct i2c_client *client = data->client; > + const struct sht3x_limit_commands *commands; > + > + index = to_sensor_dev_attr(attr)->index; > + commands = &limit_commands[index]; > + > + memcpy(position, commands->write_command, SHT3X_CMD_LENGTH); > + position += SHT3X_CMD_LENGTH; > + /* > + * ST = (T + 45) / 175 * 2^16 > + * SRH = RH / 100 * 2^16 > + * adapted for fixed point arithmetic and packed the same as > + * in limit_show() > + */ > + raw = ((u32)(temperature + 45000) * 24543) >> (16 + 7); > + raw |= ((humidity * 42950) >> 16) & 0xfe00; > + > + *(__be16 *)(position) = cpu_to_be16(raw); > + position += SHT3X_WORD_LEN; > + *position = crc8(sht3x_crc8_table, > + position - SHT3X_WORD_LEN, > + SHT3X_WORD_LEN, > + SHT3X_CRC8_INIT); > + > + mutex_lock(&data->i2c_lock); > + ret = i2c_master_send(client, buffer, sizeof(buffer)); > + mutex_unlock(&data->i2c_lock); > + if (ret != sizeof(buffer)) { > + ret = ret < 0 ? ret : -EIO; > + } else { > + mutex_lock(&data->data_lock); > + data->temperature_limits[index] = temperature; > + data->humidity_limits[index] = humidity; > + mutex_unlock(&data->data_lock); > + } > + ret = count; > + > + return ret; > +} > + > +static ssize_t temp1_limit_store(struct device *dev, > + struct device_attribute *attr, > + const char *buf, > + size_t count) > +{ > + int temperature; > + u32 humidity; > + u8 index; > + int ret; > + struct sht3x_data *data = dev_get_drvdata(dev); > + > + ret = kstrtoint(buf, 0, &temperature); > + > + if (ret) > + return -EINVAL; > + > + temperature = clamp_val(temperature, -45000, 130000); > + > + index = to_sensor_dev_attr(attr)->index; > + humidity = data->humidity_limits[index]; > + > + ret = limit_store(dev, attr, count, temperature, humidity); > + > + return ret; > +} > + > +static ssize_t humidity1_limit_store(struct device *dev, > + struct device_attribute *attr, > + const char *buf, > + size_t count) > +{ > + int temperature; > + u32 humidity; > + u8 index; > + int ret; > + struct sht3x_data *data = dev_get_drvdata(dev); > + > + ret = kstrtou32(buf, 0, &humidity); > + > + if (ret) > + return -EINVAL; > + > + humidity = clamp_val(humidity, 0, 100000); > + index = to_sensor_dev_attr(attr)->index; > + temperature = data->temperature_limits[index]; > + > + ret = limit_store(dev, attr, count, temperature, humidity); > + > + return ret; > +} > + > +static void sht3x_select_command(struct sht3x_data *data) > +{ > + /* > + * In blocking mode (clock stretching mode) the I2C bus > + * is blocked for other traffic, thus the call to i2c_master_recv() > + * will wait until the data is ready. For non blocking mode, we > + * have to wait ourselves. > + */ > + if (data->mode > 0) { > + data->command = sht3x_cmd_measure_periodic_mode; > + data->wait_time = 0; > + } else if (data->setup.blocking_io) { > + data->command = data->setup.high_precision ? > + sht3x_cmd_measure_blocking_hpm : > + sht3x_cmd_measure_blocking_lpm; > + data->wait_time = 0; > + } else { > + if (data->setup.high_precision) { > + data->command = sht3x_cmd_measure_nonblocking_hpm; > + data->wait_time = SHT3X_NONBLOCKING_WAIT_TIME_HPM; > + } else { > + data->command = sht3x_cmd_measure_nonblocking_lpm; > + data->wait_time = SHT3X_NONBLOCKING_WAIT_TIME_LPM; > + } > + } > +} > + > +static int status_register_read(struct device *dev, > + struct device_attribute *attr, > + char *buffer, int length) > +{ > + int ret; > + > + struct sht3x_data *data = dev_get_drvdata(dev); > + struct i2c_client *client = data->client; > + > + ret = sht3x_read_from_command(client, data, sht3x_cmd_read_status_reg, > + buffer, length, 0); > + > + return ret; > +} > + > +static ssize_t temp1_alarm_show(struct device *dev, > + struct device_attribute *attr, > + char *buf) > +{ > + int ret; > + int length = SHT3X_WORD_LEN + SHT3X_CRC8_LEN; > + char buffer[length]; > + > + ret = status_register_read(dev, attr, buffer, length); > + > + if (ret) > + return ret; > + > + return scnprintf(buf, PAGE_SIZE, "%d\n", (buffer[0] & 0x04) == 0x04); > +} > + > +static ssize_t humidity1_alarm_show(struct device *dev, > + struct device_attribute *attr, > + char *buf) > +{ > + int ret; > + int length = SHT3X_WORD_LEN + SHT3X_CRC8_LEN; > + char buffer[length]; > + > + ret = status_register_read(dev, attr, buffer, length); > + > + if (ret) > + return ret; > + > + return scnprintf(buf, PAGE_SIZE, "%d\n", (buffer[0] & 0x08) == 0x08); > +} > + > +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, "%d\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 -EINVAL; > + > + mode = get_mode_from_update_interval(update_interval); > + > + /* mode did not change */ > + if (mode == data->mode) > + return count; > + > + mutex_lock(&data->i2c_lock); > + mutex_lock(&data->data_lock); > + /* abort periodic measure */ > + 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(temp1_input, S_IRUGO, temp1_input_show, NULL, 0); > +static SENSOR_DEVICE_ATTR(humidity1_input, S_IRUGO, humidity1_input_show, > + NULL, 0); > +static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, temp1_limit_show, > + temp1_limit_store, 0); > +static SENSOR_DEVICE_ATTR(humidity1_max, S_IRUGO | S_IWUSR, > + humidity1_limit_show, humidity1_limit_store, 0); > +static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IRUGO | S_IWUSR, temp1_limit_show, > + temp1_limit_store, 1); > +static SENSOR_DEVICE_ATTR(humidity1_max_hyst, S_IRUGO | S_IWUSR, > + humidity1_limit_show, humidity1_limit_store, 1); > +static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO | S_IWUSR, temp1_limit_show, > + temp1_limit_store, 2); > +static SENSOR_DEVICE_ATTR(humidity1_min, S_IRUGO | S_IWUSR, > + humidity1_limit_show, humidity1_limit_store, 2); > +static SENSOR_DEVICE_ATTR(temp1_min_hyst, S_IRUGO | S_IWUSR, > + temp1_limit_show, temp1_limit_store, 3); > +static SENSOR_DEVICE_ATTR(humidity1_min_hyst, S_IRUGO | S_IWUSR, > + humidity1_limit_show, humidity1_limit_store, 3); > +static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, temp1_alarm_show, NULL, 3); > +static SENSOR_DEVICE_ATTR(humidity1_alarm, S_IRUGO, humidity1_alarm_show, > + NULL, 3); > +static SENSOR_DEVICE_ATTR(update_interval, S_IRUGO | S_IWUSR, > + update_interval_show, update_interval_store, 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_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 int sht3x_probe(struct i2c_client *client, > + const struct i2c_device_id *id) > +{ > + 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 = 0; > + 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); > + > + ret = limits_update(data); > + if (ret) > + return ret; > + > + if (id->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 = 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"); > diff --git a/include/linux/platform_data/sht3x.h b/include/linux/platform_data/sht3x.h > new file mode 100644 > index 0000000..46af9a0 > --- /dev/null > +++ b/include/linux/platform_data/sht3x.h > @@ -0,0 +1,25 @@ > +/* > + * Copyright (C) 2015 Sensirion AG, Switzerland > + * Author: David Frey <david.frey@sensirion.com> > + * Author: Pascal Sachs <pascal.sachs@sensirion.com> > + * > + * This program is free software; you can redistribute it and/or modify > + * it under the terms of the GNU General Public License as published by > + * the Free Software Foundation; either version 2 of the License, or > + * (at your option) any later version. > + * > + * This program is distributed in the hope that it will be useful, > + * but WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > + * GNU General Public License for more details. > + * > + */ > + > +#ifndef __SHT3X_H_ > +#define __SHT3X_H_ > + > +struct sht3x_platform_data { > + bool blocking_io; > + bool high_precision; > +}; > +#endif /* __SHT3X_H_ */ >
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