1 // SPDX-License-Identifier: GPL-2.0-only
3  * max31722 - hwmon driver for Maxim Integrated MAX31722/MAX31723 SPI
10 #include <linux/hwmon-sysfs.h>
13 #include <linux/spi/spi.h>
27 	u8 mode;  member
30 static int max31722_set_mode(struct max31722_data *data, u8 mode)  in max31722_set_mode()  argument
33 	struct spi_device *spi = data->spi_device;  in max31722_set_mode()  local
36 		(data->mode & MAX31722_MODE_MASK) | mode  in max31722_set_mode()
39 	ret = spi_write(spi, &buf, sizeof(buf));  in max31722_set_mode()
41 		dev_err(&spi->dev, "failed to set sensor mode.\n");  in max31722_set_mode()
44 	data->mode = (data->mode & MAX31722_MODE_MASK) | mode;  in max31722_set_mode()
55 	ret = spi_w8r16(data->spi_device, MAX31722_REG_TEMP_LSB);  in max31722_temp_show()
71 static int max31722_probe(struct spi_device *spi)  in max31722_probe()  argument
76 	data = devm_kzalloc(&spi->dev, sizeof(*data), GFP_KERNEL);  in max31722_probe()
78 		return -ENOMEM;  in max31722_probe()
80 	spi_set_drvdata(spi, data);  in max31722_probe()
81 	data->spi_device = spi;  in max31722_probe()
86 	data->mode = MAX31722_MODE_CONTINUOUS | MAX31722_RESOLUTION_12BIT;  in max31722_probe()
91 	data->hwmon_dev = hwmon_device_register_with_groups(&spi->dev,  in max31722_probe()
92 							    spi->modalias,  in max31722_probe()
95 	if (IS_ERR(data->hwmon_dev)) {  in max31722_probe()
97 		return PTR_ERR(data->hwmon_dev);  in max31722_probe()
103 static void max31722_remove(struct spi_device *spi)  in max31722_remove()  argument
105 	struct max31722_data *data = spi_get_drvdata(spi);  in max31722_remove()
108 	hwmon_device_unregister(data->hwmon_dev);  in max31722_remove()
113 		dev_warn(&spi->dev, "Failed to put device in stand-by mode\n");  in max31722_remove()
139 MODULE_DEVICE_TABLE(spi, max31722_spi_id);