1 // SPDX-License-Identifier: GPL-2.0-or-later
3  *  ads7871 - driver for TI ADS7871 A/D converter
22 #define REG_GAIN_MUX	4 /*Gain/Mux Register*/
34 /*Instruction Bit masks*/
40 /*bit masks for Rev/Oscillator Control Register*/
44 #define MUX_G_BV	4 /*allows for reg = (gain << MUX_G_BV) | ...*/
47 /*bit masks for Rev/Oscillator Control Register*/
59 #include <linux/hwmon-sysfs.h>
69 static int ads7871_read_reg8(struct spi_device *spi, int reg)  in ads7871_read_reg8()  argument
72 	reg = reg | INST_READ_BM;  in ads7871_read_reg8()
73 	ret = spi_w8r8(spi, reg);  in ads7871_read_reg8()
77 static int ads7871_read_reg16(struct spi_device *spi, int reg)  in ads7871_read_reg16()  argument
80 	reg = reg | INST_READ_BM | INST_16BIT_BM;  in ads7871_read_reg16()
81 	ret = spi_w8r16(spi, reg);  in ads7871_read_reg16()
85 static int ads7871_write_reg8(struct spi_device *spi, int reg, u8 val)  in ads7871_write_reg8()  argument
87 	u8 tmp[2] = {reg, val};  in ads7871_write_reg8()
95 	struct spi_device *spi = pdata->spi;  in voltage_show()
100 	channel = attr->index;  in voltage_show()
129 		return -1;  in voltage_show()
158 	struct device *dev = &spi->dev;  in ads7871_probe()
165 	spi->mode = (SPI_MODE_0);  in ads7871_probe()
166 	spi->bits_per_word = 8;  in ads7871_probe()
182 		return -ENODEV;  in ads7871_probe()
186 		return -ENOMEM;  in ads7871_probe()
188 	pdata->spi = spi;  in ads7871_probe()
190 	hwmon_dev = devm_hwmon_device_register_with_groups(dev, spi->modalias,  in ads7871_probe()