cregit-Linux how code gets into the kernel

Release 4.14 drivers/hwmon/max31722.c

Directory: drivers/hwmon
/*
 * max31722 - hwmon driver for Maxim Integrated MAX31722/MAX31723 SPI
 * digital thermometer and thermostats.
 *
 * Copyright (c) 2016, Intel Corporation.
 *
 * This file is subject to the terms and conditions of version 2 of
 * the GNU General Public License. See the file COPYING in the main
 * directory of this archive for more details.
 */

#include <linux/acpi.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/spi/spi.h>


#define MAX31722_REG_CFG				0x00

#define MAX31722_REG_TEMP_LSB				0x01


#define MAX31722_MODE_CONTINUOUS			0x00

#define MAX31722_MODE_STANDBY				0x01

#define MAX31722_MODE_MASK				0xFE

#define MAX31722_RESOLUTION_12BIT			0x06

#define MAX31722_WRITE_MASK				0x80


struct max31722_data {
	
struct device *hwmon_dev;
	
struct spi_device *spi_device;
	
u8 mode;
};


static int max31722_set_mode(struct max31722_data *data, u8 mode) { int ret; struct spi_device *spi = data->spi_device; u8 buf[2] = { MAX31722_REG_CFG | MAX31722_WRITE_MASK, (data->mode & MAX31722_MODE_MASK) | mode }; ret = spi_write(spi, &buf, sizeof(buf)); if (ret < 0) { dev_err(&spi->dev, "failed to set sensor mode.\n"); return ret; } data->mode = (data->mode & MAX31722_MODE_MASK) | mode; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Tiberiu Breana101100.00%1100.00%
Total101100.00%1100.00%


static ssize_t max31722_show_temp(struct device *dev, struct device_attribute *attr, char *buf) { ssize_t ret; struct max31722_data *data = dev_get_drvdata(dev); ret = spi_w8r16(data->spi_device, MAX31722_REG_TEMP_LSB); if (ret < 0) return ret; /* Keep 12 bits and multiply by the scale of 62.5 millidegrees/bit. */ return sprintf(buf, "%d\n", (s16)le16_to_cpu(ret) * 125 / 32); }

Contributors

PersonTokensPropCommitsCommitProp
Tiberiu Breana74100.00%1100.00%
Total74100.00%1100.00%

static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, max31722_show_temp, NULL, 0); static struct attribute *max31722_attrs[] = { &sensor_dev_attr_temp1_input.dev_attr.attr, NULL, }; ATTRIBUTE_GROUPS(max31722);
static int max31722_probe(struct spi_device *spi) { int ret; struct max31722_data *data; data = devm_kzalloc(&spi->dev, sizeof(*data), GFP_KERNEL); if (!data) return -ENOMEM; spi_set_drvdata(spi, data); data->spi_device = spi; /* * Set SD bit to 0 so we can have continuous measurements. * Set resolution to 12 bits for maximum precision. */ data->mode = MAX31722_MODE_CONTINUOUS | MAX31722_RESOLUTION_12BIT; ret = max31722_set_mode(data, MAX31722_MODE_CONTINUOUS); if (ret < 0) return ret; data->hwmon_dev = hwmon_device_register_with_groups(&spi->dev, spi->modalias, data, max31722_groups); if (IS_ERR(data->hwmon_dev)) { max31722_set_mode(data, MAX31722_MODE_STANDBY); return PTR_ERR(data->hwmon_dev); } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Tiberiu Breana135100.00%1100.00%
Total135100.00%1100.00%


static int max31722_remove(struct spi_device *spi) { struct max31722_data *data = spi_get_drvdata(spi); hwmon_device_unregister(data->hwmon_dev); return max31722_set_mode(data, MAX31722_MODE_STANDBY); }

Contributors

PersonTokensPropCommitsCommitProp
Tiberiu Breana36100.00%1100.00%
Total36100.00%1100.00%


static int __maybe_unused max31722_suspend(struct device *dev) { struct spi_device *spi_device = to_spi_device(dev); struct max31722_data *data = spi_get_drvdata(spi_device); return max31722_set_mode(data, MAX31722_MODE_STANDBY); }

Contributors

PersonTokensPropCommitsCommitProp
Tiberiu Breana40100.00%1100.00%
Total40100.00%1100.00%


static int __maybe_unused max31722_resume(struct device *dev) { struct spi_device *spi_device = to_spi_device(dev); struct max31722_data *data = spi_get_drvdata(spi_device); return max31722_set_mode(data, MAX31722_MODE_CONTINUOUS); }

Contributors

PersonTokensPropCommitsCommitProp
Tiberiu Breana40100.00%1100.00%
Total40100.00%1100.00%

static SIMPLE_DEV_PM_OPS(max31722_pm_ops, max31722_suspend, max31722_resume); static const struct spi_device_id max31722_spi_id[] = { {"max31722", 0}, {"max31723", 0}, {} }; static const struct acpi_device_id __maybe_unused max31722_acpi_id[] = { {"MAX31722", 0}, {"MAX31723", 0}, {} }; MODULE_DEVICE_TABLE(spi, max31722_spi_id); static struct spi_driver max31722_driver = { .driver = { .name = "max31722", .pm = &max31722_pm_ops, .acpi_match_table = ACPI_PTR(max31722_acpi_id), }, .probe = max31722_probe, .remove = max31722_remove, .id_table = max31722_spi_id, }; module_spi_driver(max31722_driver); MODULE_AUTHOR("Tiberiu Breana <tiberiu.a.breana@intel.com>"); MODULE_DESCRIPTION("max31722 sensor driver"); MODULE_LICENSE("GPL v2");

Overall Contributors

PersonTokensPropCommitsCommitProp
Tiberiu Breana658100.00%1100.00%
Total658100.00%1100.00%
Directory: drivers/hwmon
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.