// SPDX-License-Identifier: GPL-2.0-or-later /* * ads7871 - driver for TI ADS7871 A/D converter * * Copyright (c) 2010 Paul Thomas <[email protected]> * * You need to have something like this in struct spi_board_info * { * .modalias = "ads7871", * .max_speed_hz = 2*1000*1000, * .chip_select = 0, * .bus_num = 1, * }, */ /*From figure 18 in the datasheet*/ /*Register addresses*/ #define REG_LS_BYTE … #define REG_MS_BYTE … #define REG_PGA_VALID … #define REG_AD_CONTROL … #define REG_GAIN_MUX … #define REG_IO_STATE … #define REG_IO_CONTROL … #define REG_OSC_CONTROL … #define REG_SER_CONTROL … #define REG_ID … /* * From figure 17 in the datasheet * These bits get ORed with the address to form * the instruction byte */ /*Instruction Bit masks*/ #define INST_MODE_BM … #define INST_READ_BM … #define INST_16BIT_BM … /*From figure 18 in the datasheet*/ /*bit masks for Rev/Oscillator Control Register*/ #define MUX_CNV_BV … #define MUX_CNV_BM … #define MUX_M3_BM … #define MUX_G_BV … /*From figure 18 in the datasheet*/ /*bit masks for Rev/Oscillator Control Register*/ #define OSC_OSCR_BM … #define OSC_OSCE_BM … #define OSC_REFE_BM … #define OSC_BUFE_BM … #define OSC_R2V_BM … #define OSC_RBG_BM … #include <linux/module.h> #include <linux/init.h> #include <linux/spi/spi.h> #include <linux/hwmon.h> #include <linux/hwmon-sysfs.h> #include <linux/err.h> #include <linux/delay.h> #define DEVICE_NAME … struct ads7871_data { … }; static int ads7871_read_reg8(struct spi_device *spi, int reg) { … } static int ads7871_read_reg16(struct spi_device *spi, int reg) { … } static int ads7871_write_reg8(struct spi_device *spi, int reg, u8 val) { … } static ssize_t voltage_show(struct device *dev, struct device_attribute *da, char *buf) { … } static SENSOR_DEVICE_ATTR_RO(in0_input, voltage, 0); static SENSOR_DEVICE_ATTR_RO(in1_input, voltage, 1); static SENSOR_DEVICE_ATTR_RO(in2_input, voltage, 2); static SENSOR_DEVICE_ATTR_RO(in3_input, voltage, 3); static SENSOR_DEVICE_ATTR_RO(in4_input, voltage, 4); static SENSOR_DEVICE_ATTR_RO(in5_input, voltage, 5); static SENSOR_DEVICE_ATTR_RO(in6_input, voltage, 6); static SENSOR_DEVICE_ATTR_RO(in7_input, voltage, 7); static struct attribute *ads7871_attrs[] = …; ATTRIBUTE_GROUPS(…); static int ads7871_probe(struct spi_device *spi) { … } static struct spi_driver ads7871_driver = …; module_spi_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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