Add meas-spec sensors common part
Measurement specialties drivers common part. These functions are used by further drivers in the patchset: TSYS01, TSYS02D, HTU21, MS5637, MS8607 Signed-off-by: Ludovic Tancerel <ludovic.tancerel@maplehightech.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Ludovic Tancerel
Jonathan Cameron
parent
f9ab96e212
commit
d574a87cc3
@ -3,5 +3,6 @@
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#
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source "drivers/iio/common/hid-sensors/Kconfig"
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source "drivers/iio/common/ms_sensors/Kconfig"
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source "drivers/iio/common/ssp_sensors/Kconfig"
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source "drivers/iio/common/st_sensors/Kconfig"
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@ -8,5 +8,6 @@
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# When adding new entries keep the list in alphabetical order
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obj-y += hid-sensors/
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obj-y += ms_sensors/
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obj-y += ssp_sensors/
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obj-y += st_sensors/
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6
drivers/iio/common/ms_sensors/Kconfig
Normal file
6
drivers/iio/common/ms_sensors/Kconfig
Normal file
@ -0,0 +1,6 @@
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#
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# Measurements Specialties sensors common library
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#
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config IIO_MS_SENSORS_I2C
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tristate
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5
drivers/iio/common/ms_sensors/Makefile
Normal file
5
drivers/iio/common/ms_sensors/Makefile
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@ -0,0 +1,5 @@
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#
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# Makefile for the Measurement Specialties sensor common modules.
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#
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obj-$(CONFIG_IIO_MS_SENSORS_I2C) += ms_sensors_i2c.o
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651
drivers/iio/common/ms_sensors/ms_sensors_i2c.c
Normal file
651
drivers/iio/common/ms_sensors/ms_sensors_i2c.c
Normal file
@ -0,0 +1,651 @@
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/*
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* Measurements Specialties driver common i2c functions
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*
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* Copyright (c) 2015 Measurement-Specialties
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*
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* Licensed under the GPL-2.
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*/
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#include <linux/module.h>
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#include <linux/iio/iio.h>
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#include <linux/device.h>
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#include <linux/delay.h>
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#include "ms_sensors_i2c.h"
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/* Conversion times in us */
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static const u16 ms_sensors_ht_t_conversion_time[] = { 50000, 25000,
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13000, 7000 };
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static const u16 ms_sensors_ht_h_conversion_time[] = { 16000, 3000,
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5000, 8000 };
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static const u16 ms_sensors_tp_conversion_time[] = { 500, 1100, 2100,
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4100, 8220, 16440 };
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#define MS_SENSORS_SERIAL_READ_MSB 0xFA0F
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#define MS_SENSORS_SERIAL_READ_LSB 0xFCC9
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#define MS_SENSORS_CONFIG_REG_WRITE 0xE6
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#define MS_SENSORS_CONFIG_REG_READ 0xE7
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#define MS_SENSORS_HT_T_CONVERSION_START 0xF3
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#define MS_SENSORS_HT_H_CONVERSION_START 0xF5
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#define MS_SENSORS_TP_PROM_READ 0xA0
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#define MS_SENSORS_TP_T_CONVERSION_START 0x50
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#define MS_SENSORS_TP_P_CONVERSION_START 0x40
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#define MS_SENSORS_TP_ADC_READ 0x00
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#define MS_SENSORS_NO_READ_CMD 0xFF
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/**
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* ms_sensors_reset() - Reset function
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* @cli: pointer to device client
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* @cmd: reset cmd. Depends on device in use
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* @delay: usleep minimal delay after reset command is issued
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*
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* Generic I2C reset function for Measurement Specialties devices.
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*
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* Return: 0 on success, negative errno otherwise.
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*/
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int ms_sensors_reset(void *cli, u8 cmd, unsigned int delay)
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{
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int ret;
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struct i2c_client *client = cli;
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ret = i2c_smbus_write_byte(client, cmd);
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if (ret) {
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dev_err(&client->dev, "Failed to reset device\n");
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return ret;
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}
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usleep_range(delay, delay + 1000);
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return 0;
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}
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EXPORT_SYMBOL(ms_sensors_reset);
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/**
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* ms_sensors_read_prom_word() - PROM word read function
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* @cli: pointer to device client
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* @cmd: PROM read cmd. Depends on device and prom id
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* @word: pointer to word destination value
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*
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* Generic i2c prom word read function for Measurement Specialties devices.
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*
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* Return: 0 on success, negative errno otherwise.
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*/
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int ms_sensors_read_prom_word(void *cli, int cmd, u16 *word)
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{
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int ret;
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struct i2c_client *client = (struct i2c_client *)cli;
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ret = i2c_smbus_read_word_swapped(client, cmd);
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if (ret < 0) {
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dev_err(&client->dev, "Failed to read prom word\n");
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return ret;
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}
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*word = ret;
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return 0;
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}
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EXPORT_SYMBOL(ms_sensors_read_prom_word);
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/**
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* ms_sensors_convert_and_read() - ADC conversion & read function
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* @cli: pointer to device client
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* @conv: ADC conversion command. Depends on device in use
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* @rd: ADC read command. Depends on device in use
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* @delay: usleep minimal delay after conversion command is issued
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* @adc: pointer to ADC destination value
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*
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* Generic ADC conversion & read function for Measurement Specialties
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* devices.
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* The function will issue conversion command, sleep appopriate delay, and
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* issue command to read ADC.
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*
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* Return: 0 on success, negative errno otherwise.
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*/
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int ms_sensors_convert_and_read(void *cli, u8 conv, u8 rd,
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unsigned int delay, u32 *adc)
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{
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int ret;
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u32 buf = 0;
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struct i2c_client *client = (struct i2c_client *)cli;
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/* Trigger conversion */
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ret = i2c_smbus_write_byte(client, conv);
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if (ret)
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goto err;
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usleep_range(delay, delay + 1000);
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/* Retrieve ADC value */
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if (rd != MS_SENSORS_NO_READ_CMD)
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ret = i2c_smbus_read_i2c_block_data(client, rd, 3, (u8 *)&buf);
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else
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ret = i2c_master_recv(client, (u8 *)&buf, 3);
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if (ret < 0)
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goto err;
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dev_dbg(&client->dev, "ADC raw value : %x\n", be32_to_cpu(buf) >> 8);
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*adc = be32_to_cpu(buf) >> 8;
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return 0;
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err:
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dev_err(&client->dev, "Unable to make sensor adc conversion\n");
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return ret;
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}
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EXPORT_SYMBOL(ms_sensors_convert_and_read);
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/**
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* ms_sensors_crc_valid() - CRC check function
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* @value: input and CRC compare value
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*
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* Cyclic Redundancy Check function used in TSYS02D, HTU21, MS8607.
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* This function performs a x^8 + x^5 + x^4 + 1 polynomial CRC.
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* The argument contains CRC value in LSB byte while the bytes 1 and 2
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* are used for CRC computation.
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*
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* Return: 1 if CRC is valid, 0 otherwise.
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*/
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static bool ms_sensors_crc_valid(u32 value)
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{
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u32 polynom = 0x988000; /* x^8 + x^5 + x^4 + 1 */
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u32 msb = 0x800000;
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u32 mask = 0xFF8000;
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u32 result = value & 0xFFFF00;
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u8 crc = value & 0xFF;
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while (msb != 0x80) {
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if (result & msb)
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result = ((result ^ polynom) & mask)
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| (result & ~mask);
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msb >>= 1;
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mask >>= 1;
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polynom >>= 1;
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}
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return result == crc;
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}
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/**
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* ms_sensors_read_serial() - Serial number read function
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* @cli: pointer to i2c client
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* @sn: pointer to 64-bits destination value
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*
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* Generic i2c serial number read function for Measurement Specialties devices.
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* This function is used for TSYS02d, HTU21, MS8607 chipset.
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* Refer to datasheet:
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* http://www.meas-spec.com/downloads/HTU2X_Serial_Number_Reading.pdf
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*
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* Sensor raw MSB serial number format is the following :
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* [ SNB3, CRC, SNB2, CRC, SNB1, CRC, SNB0, CRC]
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* Sensor raw LSB serial number format is the following :
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* [ X, X, SNC1, SNC0, CRC, SNA1, SNA0, CRC]
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* The resulting serial number is following :
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* [ SNA1, SNA0, SNB3, SNB2, SNB1, SNB0, SNC1, SNC0]
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*
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* Return: 0 on success, negative errno otherwise.
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*/
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int ms_sensors_read_serial(struct i2c_client *client, u64 *sn)
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{
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u8 i;
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u64 rcv_buf = 0;
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u16 send_buf;
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int ret;
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struct i2c_msg msg[2] = {
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{
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.addr = client->addr,
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.flags = client->flags,
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.len = 2,
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.buf = (__u8 *)&send_buf,
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},
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{
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.addr = client->addr,
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.flags = client->flags | I2C_M_RD,
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.buf = (__u8 *)&rcv_buf,
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},
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};
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/* Read MSB part of serial number */
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send_buf = cpu_to_be16(MS_SENSORS_SERIAL_READ_MSB);
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msg[1].len = 8;
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ret = i2c_transfer(client->adapter, msg, 2);
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if (ret < 0) {
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dev_err(&client->dev, "Unable to read device serial number");
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return ret;
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}
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rcv_buf = be64_to_cpu(rcv_buf);
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dev_dbg(&client->dev, "Serial MSB raw : %llx\n", rcv_buf);
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for (i = 0; i < 64; i += 16) {
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if (!ms_sensors_crc_valid((rcv_buf >> i) & 0xFFFF))
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return -ENODEV;
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}
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*sn = (((rcv_buf >> 32) & 0xFF000000) |
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((rcv_buf >> 24) & 0x00FF0000) |
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((rcv_buf >> 16) & 0x0000FF00) |
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((rcv_buf >> 8) & 0x000000FF)) << 16;
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/* Read LSB part of serial number */
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send_buf = cpu_to_be16(MS_SENSORS_SERIAL_READ_LSB);
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msg[1].len = 6;
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rcv_buf = 0;
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ret = i2c_transfer(client->adapter, msg, 2);
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if (ret < 0) {
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dev_err(&client->dev, "Unable to read device serial number");
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return ret;
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}
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rcv_buf = be64_to_cpu(rcv_buf) >> 16;
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dev_dbg(&client->dev, "Serial MSB raw : %llx\n", rcv_buf);
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for (i = 0; i < 48; i += 24) {
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if (!ms_sensors_crc_valid((rcv_buf >> i) & 0xFFFFFF))
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return -ENODEV;
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}
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*sn |= (rcv_buf & 0xFFFF00) << 40 | (rcv_buf >> 32);
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return 0;
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}
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EXPORT_SYMBOL(ms_sensors_read_serial);
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static int ms_sensors_read_config_reg(struct i2c_client *client,
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u8 *config_reg)
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{
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int ret;
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ret = i2c_smbus_write_byte(client, MS_SENSORS_CONFIG_REG_READ);
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if (ret) {
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dev_err(&client->dev, "Unable to read config register");
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return ret;
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}
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ret = i2c_master_recv(client, config_reg, 1);
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if (ret < 0) {
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dev_err(&client->dev, "Unable to read config register");
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return ret;
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}
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dev_dbg(&client->dev, "Config register :%x\n", *config_reg);
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return 0;
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}
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/**
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* ms_sensors_write_resolution() - Set resolution function
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* @dev_data: pointer to temperature/humidity device data
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* @i: resolution index to set
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*
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* This function will program the appropriate resolution based on the index
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* provided when user space will set samp_freq channel.
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* This function is used for TSYS02D, HTU21 and MS8607 chipsets.
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*
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* Return: 0 on success, negative errno otherwise.
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*/
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ssize_t ms_sensors_write_resolution(struct ms_ht_dev *dev_data,
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u8 i)
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{
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u8 config_reg;
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int ret;
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ret = ms_sensors_read_config_reg(dev_data->client, &config_reg);
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if (ret)
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return ret;
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config_reg &= 0x7E;
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config_reg |= ((i & 1) << 7) + ((i & 2) >> 1);
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return i2c_smbus_write_byte_data(dev_data->client,
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MS_SENSORS_CONFIG_REG_WRITE,
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config_reg);
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}
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EXPORT_SYMBOL(ms_sensors_write_resolution);
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/**
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* ms_sensors_show_battery_low() - Show device battery low indicator
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* @dev_data: pointer to temperature/humidity device data
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* @buf: pointer to char buffer to write result
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*
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* This function will read battery indicator value in the device and
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* return 1 if the device voltage is below 2.25V.
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* This function is used for TSYS02D, HTU21 and MS8607 chipsets.
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*
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* Return: length of sprintf on success, negative errno otherwise.
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*/
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ssize_t ms_sensors_show_battery_low(struct ms_ht_dev *dev_data,
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char *buf)
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{
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int ret;
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u8 config_reg;
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mutex_lock(&dev_data->lock);
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ret = ms_sensors_read_config_reg(dev_data->client, &config_reg);
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mutex_unlock(&dev_data->lock);
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if (ret)
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return ret;
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return sprintf(buf, "%d\n", (config_reg & 0x40) >> 6);
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}
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EXPORT_SYMBOL(ms_sensors_show_battery_low);
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/**
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* ms_sensors_show_heater() - Show device heater
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* @dev_data: pointer to temperature/humidity device data
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* @buf: pointer to char buffer to write result
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*
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* This function will read heater enable value in the device and
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* return 1 if the heater is enabled.
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* This function is used for HTU21 and MS8607 chipsets.
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*
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* Return: length of sprintf on success, negative errno otherwise.
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*/
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ssize_t ms_sensors_show_heater(struct ms_ht_dev *dev_data,
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char *buf)
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{
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u8 config_reg;
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int ret;
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mutex_lock(&dev_data->lock);
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ret = ms_sensors_read_config_reg(dev_data->client, &config_reg);
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mutex_unlock(&dev_data->lock);
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if (ret)
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return ret;
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return sprintf(buf, "%d\n", (config_reg & 0x4) >> 2);
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}
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EXPORT_SYMBOL(ms_sensors_show_heater);
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/**
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* ms_sensors_write_heater() - Write device heater
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* @dev_data: pointer to temperature/humidity device data
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* @buf: pointer to char buffer from user space
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* @len: length of buf
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*
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* This function will write 1 or 0 value in the device
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* to enable or disable heater.
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* This function is used for HTU21 and MS8607 chipsets.
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*
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* Return: length of buffer, negative errno otherwise.
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*/
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ssize_t ms_sensors_write_heater(struct ms_ht_dev *dev_data,
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const char *buf, size_t len)
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{
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u8 val, config_reg;
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int ret;
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ret = kstrtou8(buf, 10, &val);
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if (ret)
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return ret;
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if (val > 1)
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return -EINVAL;
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mutex_lock(&dev_data->lock);
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ret = ms_sensors_read_config_reg(dev_data->client, &config_reg);
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if (ret) {
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mutex_unlock(&dev_data->lock);
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return ret;
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}
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config_reg &= 0xFB;
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config_reg |= val << 2;
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ret = i2c_smbus_write_byte_data(dev_data->client,
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MS_SENSORS_CONFIG_REG_WRITE,
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config_reg);
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mutex_unlock(&dev_data->lock);
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if (ret) {
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dev_err(&dev_data->client->dev, "Unable to write config register\n");
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return ret;
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}
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return len;
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}
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EXPORT_SYMBOL(ms_sensors_write_heater);
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/**
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* ms_sensors_ht_read_temperature() - Read temperature
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* @dev_data: pointer to temperature/humidity device data
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* @temperature:pointer to temperature destination value
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*
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* This function will get temperature ADC value from the device,
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* check the CRC and compute the temperature value.
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* This function is used for TSYS02D, HTU21 and MS8607 chipsets.
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*
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* Return: 0 on success, negative errno otherwise.
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*/
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int ms_sensors_ht_read_temperature(struct ms_ht_dev *dev_data,
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s32 *temperature)
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{
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int ret;
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u32 adc;
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u16 delay;
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mutex_lock(&dev_data->lock);
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delay = ms_sensors_ht_t_conversion_time[dev_data->res_index];
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ret = ms_sensors_convert_and_read(dev_data->client,
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MS_SENSORS_HT_T_CONVERSION_START,
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MS_SENSORS_NO_READ_CMD,
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delay, &adc);
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mutex_unlock(&dev_data->lock);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
if (!ms_sensors_crc_valid(adc)) {
|
||||
dev_err(&dev_data->client->dev,
|
||||
"Temperature read crc check error\n");
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
/* Temperature algorithm */
|
||||
*temperature = (((s64)(adc >> 8) * 175720) >> 16) - 46850;
|
||||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL(ms_sensors_ht_read_temperature);
|
||||
|
||||
/**
|
||||
* ms_sensors_ht_read_humidity() - Read humidity
|
||||
* @dev_data: pointer to temperature/humidity device data
|
||||
* @humidity: pointer to humidity destination value
|
||||
*
|
||||
* This function will get humidity ADC value from the device,
|
||||
* check the CRC and compute the temperature value.
|
||||
* This function is used for HTU21 and MS8607 chipsets.
|
||||
*
|
||||
* Return: 0 on success, negative errno otherwise.
|
||||
*/
|
||||
int ms_sensors_ht_read_humidity(struct ms_ht_dev *dev_data,
|
||||
u32 *humidity)
|
||||
{
|
||||
int ret;
|
||||
u32 adc;
|
||||
u16 delay;
|
||||
|
||||
mutex_lock(&dev_data->lock);
|
||||
delay = ms_sensors_ht_h_conversion_time[dev_data->res_index];
|
||||
ret = ms_sensors_convert_and_read(dev_data->client,
|
||||
MS_SENSORS_HT_H_CONVERSION_START,
|
||||
MS_SENSORS_NO_READ_CMD,
|
||||
delay, &adc);
|
||||
mutex_unlock(&dev_data->lock);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
if (!ms_sensors_crc_valid(adc)) {
|
||||
dev_err(&dev_data->client->dev,
|
||||
"Humidity read crc check error\n");
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
/* Humidity algorithm */
|
||||
*humidity = (((s32)(adc >> 8) * 12500) >> 16) * 10 - 6000;
|
||||
if (*humidity >= 100000)
|
||||
*humidity = 100000;
|
||||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL(ms_sensors_ht_read_humidity);
|
||||
|
||||
/**
|
||||
* ms_sensors_tp_crc_valid() - CRC check function for
|
||||
* Temperature and pressure devices.
|
||||
* This function is only used when reading PROM coefficients
|
||||
*
|
||||
* @prom: pointer to PROM coefficients array
|
||||
* @len: length of PROM coefficients array
|
||||
*
|
||||
* Return: True if CRC is ok.
|
||||
*/
|
||||
static bool ms_sensors_tp_crc_valid(u16 *prom, u8 len)
|
||||
{
|
||||
unsigned int cnt, n_bit;
|
||||
u16 n_rem = 0x0000, crc_read = prom[0], crc = (*prom & 0xF000) >> 12;
|
||||
|
||||
prom[len - 1] = 0;
|
||||
prom[0] &= 0x0FFF; /* Clear the CRC computation part */
|
||||
|
||||
for (cnt = 0; cnt < len * 2; cnt++) {
|
||||
if (cnt % 2 == 1)
|
||||
n_rem ^= prom[cnt >> 1] & 0x00FF;
|
||||
else
|
||||
n_rem ^= prom[cnt >> 1] >> 8;
|
||||
|
||||
for (n_bit = 8; n_bit > 0; n_bit--) {
|
||||
if (n_rem & 0x8000)
|
||||
n_rem = (n_rem << 1) ^ 0x3000;
|
||||
else
|
||||
n_rem <<= 1;
|
||||
}
|
||||
}
|
||||
n_rem >>= 12;
|
||||
prom[0] = crc_read;
|
||||
|
||||
return n_rem == crc;
|
||||
}
|
||||
|
||||
/**
|
||||
* ms_sensors_tp_read_prom() - prom coeff read function
|
||||
* @dev_data: pointer to temperature/pressure device data
|
||||
*
|
||||
* This function will read prom coefficients and check CRC.
|
||||
* This function is used for MS5637 and MS8607 chipsets.
|
||||
*
|
||||
* Return: 0 on success, negative errno otherwise.
|
||||
*/
|
||||
int ms_sensors_tp_read_prom(struct ms_tp_dev *dev_data)
|
||||
{
|
||||
int i, ret;
|
||||
|
||||
for (i = 0; i < MS_SENSORS_TP_PROM_WORDS_NB; i++) {
|
||||
ret = ms_sensors_read_prom_word(
|
||||
dev_data->client,
|
||||
MS_SENSORS_TP_PROM_READ + (i << 1),
|
||||
&dev_data->prom[i]);
|
||||
|
||||
if (ret)
|
||||
return ret;
|
||||
}
|
||||
|
||||
if (!ms_sensors_tp_crc_valid(dev_data->prom,
|
||||
MS_SENSORS_TP_PROM_WORDS_NB + 1)) {
|
||||
dev_err(&dev_data->client->dev,
|
||||
"Calibration coefficients crc check error\n");
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL(ms_sensors_tp_read_prom);
|
||||
|
||||
/**
|
||||
* ms_sensors_read_temp_and_pressure() - read temp and pressure
|
||||
* @dev_data: pointer to temperature/pressure device data
|
||||
* @temperature:pointer to temperature destination value
|
||||
* @pressure: pointer to pressure destination value
|
||||
*
|
||||
* This function will read ADC and compute pressure and temperature value.
|
||||
* This function is used for MS5637 and MS8607 chipsets.
|
||||
*
|
||||
* Return: 0 on success, negative errno otherwise.
|
||||
*/
|
||||
int ms_sensors_read_temp_and_pressure(struct ms_tp_dev *dev_data,
|
||||
int *temperature,
|
||||
unsigned int *pressure)
|
||||
{
|
||||
int ret;
|
||||
u32 t_adc, p_adc;
|
||||
s32 dt, temp;
|
||||
s64 off, sens, t2, off2, sens2;
|
||||
u16 *prom = dev_data->prom, delay;
|
||||
|
||||
mutex_lock(&dev_data->lock);
|
||||
delay = ms_sensors_tp_conversion_time[dev_data->res_index];
|
||||
|
||||
ret = ms_sensors_convert_and_read(
|
||||
dev_data->client,
|
||||
MS_SENSORS_TP_T_CONVERSION_START +
|
||||
dev_data->res_index * 2,
|
||||
MS_SENSORS_TP_ADC_READ,
|
||||
delay, &t_adc);
|
||||
if (ret) {
|
||||
mutex_unlock(&dev_data->lock);
|
||||
return ret;
|
||||
}
|
||||
|
||||
ret = ms_sensors_convert_and_read(
|
||||
dev_data->client,
|
||||
MS_SENSORS_TP_P_CONVERSION_START +
|
||||
dev_data->res_index * 2,
|
||||
MS_SENSORS_TP_ADC_READ,
|
||||
delay, &p_adc);
|
||||
mutex_unlock(&dev_data->lock);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
dt = (s32)t_adc - (prom[5] << 8);
|
||||
|
||||
/* Actual temperature = 2000 + dT * TEMPSENS */
|
||||
temp = 2000 + (((s64)dt * prom[6]) >> 23);
|
||||
|
||||
/* Second order temperature compensation */
|
||||
if (temp < 2000) {
|
||||
s64 tmp = (s64)temp - 2000;
|
||||
|
||||
t2 = (3 * ((s64)dt * (s64)dt)) >> 33;
|
||||
off2 = (61 * tmp * tmp) >> 4;
|
||||
sens2 = (29 * tmp * tmp) >> 4;
|
||||
|
||||
if (temp < -1500) {
|
||||
s64 tmp = (s64)temp + 1500;
|
||||
|
||||
off2 += 17 * tmp * tmp;
|
||||
sens2 += 9 * tmp * tmp;
|
||||
}
|
||||
} else {
|
||||
t2 = (5 * ((s64)dt * (s64)dt)) >> 38;
|
||||
off2 = 0;
|
||||
sens2 = 0;
|
||||
}
|
||||
|
||||
/* OFF = OFF_T1 + TCO * dT */
|
||||
off = (((s64)prom[2]) << 17) + ((((s64)prom[4]) * (s64)dt) >> 6);
|
||||
off -= off2;
|
||||
|
||||
/* Sensitivity at actual temperature = SENS_T1 + TCS * dT */
|
||||
sens = (((s64)prom[1]) << 16) + (((s64)prom[3] * dt) >> 7);
|
||||
sens -= sens2;
|
||||
|
||||
/* Temperature compensated pressure = D1 * SENS - OFF */
|
||||
*temperature = (temp - t2) * 10;
|
||||
*pressure = (u32)(((((s64)p_adc * sens) >> 21) - off) >> 15);
|
||||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL(ms_sensors_read_temp_and_pressure);
|
||||
|
||||
MODULE_DESCRIPTION("Measurement-Specialties common i2c driver");
|
||||
MODULE_AUTHOR("William Markezana <william.markezana@meas-spec.com>");
|
||||
MODULE_AUTHOR("Ludovic Tancerel <ludovic.tancerel@maplehightech.com>");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
|
||||
66
drivers/iio/common/ms_sensors/ms_sensors_i2c.h
Normal file
66
drivers/iio/common/ms_sensors/ms_sensors_i2c.h
Normal file
@ -0,0 +1,66 @@
|
||||
/*
|
||||
* Measurements Specialties common sensor driver
|
||||
*
|
||||
* Copyright (c) 2015 Measurement-Specialties
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*/
|
||||
|
||||
#ifndef _MS_SENSORS_I2C_H
|
||||
#define _MS_SENSORS_I2C_H
|
||||
|
||||
#include <linux/i2c.h>
|
||||
#include <linux/mutex.h>
|
||||
|
||||
#define MS_SENSORS_TP_PROM_WORDS_NB 7
|
||||
|
||||
/**
|
||||
* struct ms_ht_dev - Humidity/Temperature sensor device structure
|
||||
* @client: i2c client
|
||||
* @lock: lock protecting the i2c conversion
|
||||
* @res_index: index to selected sensor resolution
|
||||
*/
|
||||
struct ms_ht_dev {
|
||||
struct i2c_client *client;
|
||||
struct mutex lock;
|
||||
u8 res_index;
|
||||
};
|
||||
|
||||
/**
|
||||
* struct ms_tp_dev - Temperature/Pressure sensor device structure
|
||||
* @client: i2c client
|
||||
* @lock: lock protecting the i2c conversion
|
||||
* @prom: array of PROM coefficients used for conversion. Added element
|
||||
* for CRC computation
|
||||
* @res_index: index to selected sensor resolution
|
||||
*/
|
||||
struct ms_tp_dev {
|
||||
struct i2c_client *client;
|
||||
struct mutex lock;
|
||||
u16 prom[MS_SENSORS_TP_PROM_WORDS_NB + 1];
|
||||
u8 res_index;
|
||||
};
|
||||
|
||||
int ms_sensors_reset(void *cli, u8 cmd, unsigned int delay);
|
||||
int ms_sensors_read_prom_word(void *cli, int cmd, u16 *word);
|
||||
int ms_sensors_convert_and_read(void *cli, u8 conv, u8 rd,
|
||||
unsigned int delay, u32 *adc);
|
||||
int ms_sensors_read_serial(struct i2c_client *client, u64 *sn);
|
||||
ssize_t ms_sensors_show_serial(struct ms_ht_dev *dev_data, char *buf);
|
||||
ssize_t ms_sensors_write_resolution(struct ms_ht_dev *dev_data, u8 i);
|
||||
ssize_t ms_sensors_show_battery_low(struct ms_ht_dev *dev_data, char *buf);
|
||||
ssize_t ms_sensors_show_heater(struct ms_ht_dev *dev_data, char *buf);
|
||||
ssize_t ms_sensors_write_heater(struct ms_ht_dev *dev_data,
|
||||
const char *buf, size_t len);
|
||||
int ms_sensors_ht_read_temperature(struct ms_ht_dev *dev_data,
|
||||
s32 *temperature);
|
||||
int ms_sensors_ht_read_humidity(struct ms_ht_dev *dev_data,
|
||||
u32 *humidity);
|
||||
int ms_sensors_tp_read_prom(struct ms_tp_dev *dev_data);
|
||||
int ms_sensors_read_temp_and_pressure(struct ms_tp_dev *dev_data,
|
||||
int *temperature,
|
||||
unsigned int *pressure);
|
||||
|
||||
#endif /* _MS_SENSORS_I2C_H */
|
||||
Loading…
Reference in New Issue
Block a user