+++ /dev/null
-/*
- * AD7314 digital temperature sensor driver for AD7314, ADT7301 and ADT7302
- *
- * Copyright 2010 Analog Devices Inc.
- *
- * Licensed under the GPL-2 or later.
- */
-
-#include <linux/device.h>
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/sysfs.h>
-#include <linux/spi/spi.h>
-#include <linux/module.h>
-
-#include "../iio.h"
-#include "../sysfs.h"
-
-/*
- * AD7314 power mode
- */
-#define AD7314_PD 0x2000
-
-/*
- * AD7314 temperature masks
- */
-#define AD7314_TEMP_SIGN 0x200
-#define AD7314_TEMP_MASK 0x7FE0
-#define AD7314_TEMP_OFFSET 5
-#define AD7314_TEMP_FLOAT_OFFSET 2
-#define AD7314_TEMP_FLOAT_MASK 0x3
-
-/*
- * ADT7301 and ADT7302 temperature masks
- */
-#define ADT7301_TEMP_SIGN 0x2000
-#define ADT7301_TEMP_MASK 0x2FFF
-#define ADT7301_TEMP_FLOAT_OFFSET 5
-#define ADT7301_TEMP_FLOAT_MASK 0x1F
-
-/*
- * struct ad7314_chip_info - chip specifc information
- */
-
-struct ad7314_chip_info {
- struct spi_device *spi_dev;
- s64 last_timestamp;
- u8 mode;
-};
-
-/*
- * ad7314 register access by SPI
- */
-
-static int ad7314_spi_read(struct ad7314_chip_info *chip, u16 *data)
-{
- struct spi_device *spi_dev = chip->spi_dev;
- int ret = 0;
- u16 value;
-
- ret = spi_read(spi_dev, (u8 *)&value, sizeof(value));
- if (ret < 0) {
- dev_err(&spi_dev->dev, "SPI read error\n");
- return ret;
- }
-
- *data = be16_to_cpu((u16)value);
-
- return ret;
-}
-
-static int ad7314_spi_write(struct ad7314_chip_info *chip, u16 data)
-{
- struct spi_device *spi_dev = chip->spi_dev;
- int ret = 0;
- u16 value = cpu_to_be16(data);
-
- ret = spi_write(spi_dev, (u8 *)&value, sizeof(value));
- if (ret < 0)
- dev_err(&spi_dev->dev, "SPI write error\n");
-
- return ret;
-}
-
-static ssize_t ad7314_show_mode(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_dev *dev_info = dev_get_drvdata(dev);
- struct ad7314_chip_info *chip = iio_priv(dev_info);
-
- if (chip->mode)
- return sprintf(buf, "power-save\n");
- else
- return sprintf(buf, "full\n");
-}
-
-static ssize_t ad7314_store_mode(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t len)
-{
- struct iio_dev *dev_info = dev_get_drvdata(dev);
- struct ad7314_chip_info *chip = iio_priv(dev_info);
- u16 mode = 0;
- int ret;
-
- if (!strcmp(buf, "full"))
- mode = AD7314_PD;
-
- ret = ad7314_spi_write(chip, mode);
- if (ret)
- return -EIO;
-
- chip->mode = mode;
-
- return len;
-}
-
-static IIO_DEVICE_ATTR(mode, S_IRUGO | S_IWUSR,
- ad7314_show_mode,
- ad7314_store_mode,
- 0);
-
-static ssize_t ad7314_show_available_modes(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- return sprintf(buf, "full\npower-save\n");
-}
-
-static IIO_DEVICE_ATTR(available_modes, S_IRUGO, ad7314_show_available_modes, NULL, 0);
-
-static ssize_t ad7314_show_temperature(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_dev *dev_info = dev_get_drvdata(dev);
- struct ad7314_chip_info *chip = iio_priv(dev_info);
- u16 data;
- char sign = ' ';
- int ret;
-
- if (chip->mode) {
- ret = ad7314_spi_write(chip, 0);
- if (ret)
- return -EIO;
- }
-
- ret = ad7314_spi_read(chip, &data);
- if (ret)
- return -EIO;
-
- if (chip->mode)
- ad7314_spi_write(chip, chip->mode);
-
- if (strcmp(dev_info->name, "ad7314")) {
- data = (data & AD7314_TEMP_MASK) >>
- AD7314_TEMP_OFFSET;
- if (data & AD7314_TEMP_SIGN) {
- data = (AD7314_TEMP_SIGN << 1) - data;
- sign = '-';
- }
-
- return sprintf(buf, "%c%d.%.2d\n", sign,
- data >> AD7314_TEMP_FLOAT_OFFSET,
- (data & AD7314_TEMP_FLOAT_MASK) * 25);
- } else {
- data &= ADT7301_TEMP_MASK;
- if (data & ADT7301_TEMP_SIGN) {
- data = (ADT7301_TEMP_SIGN << 1) - data;
- sign = '-';
- }
-
- return sprintf(buf, "%c%d.%.5d\n", sign,
- data >> ADT7301_TEMP_FLOAT_OFFSET,
- (data & ADT7301_TEMP_FLOAT_MASK) * 3125);
- }
-}
-
-static IIO_DEVICE_ATTR(temperature, S_IRUGO, ad7314_show_temperature, NULL, 0);
-
-static struct attribute *ad7314_attributes[] = {
- &iio_dev_attr_available_modes.dev_attr.attr,
- &iio_dev_attr_mode.dev_attr.attr,
- &iio_dev_attr_temperature.dev_attr.attr,
- NULL,
-};
-
-static const struct attribute_group ad7314_attribute_group = {
- .attrs = ad7314_attributes,
-};
-
-static const struct iio_info ad7314_info = {
- .attrs = &ad7314_attribute_group,
- .driver_module = THIS_MODULE,
-};
-/*
- * device probe and remove
- */
-
-static int __devinit ad7314_probe(struct spi_device *spi_dev)
-{
- struct ad7314_chip_info *chip;
- struct iio_dev *indio_dev;
- int ret = 0;
-
- indio_dev = iio_allocate_device(sizeof(*chip));
- if (indio_dev == NULL) {
- ret = -ENOMEM;
- goto error_ret;
- }
- chip = iio_priv(indio_dev);
- /* this is only used for device removal purposes */
- dev_set_drvdata(&spi_dev->dev, chip);
-
- chip->spi_dev = spi_dev;
-
- indio_dev->name = spi_get_device_id(spi_dev)->name;
- indio_dev->dev.parent = &spi_dev->dev;
- indio_dev->info = &ad7314_info;
-
- ret = iio_device_register(indio_dev);
- if (ret)
- goto error_free_dev;
-
- dev_info(&spi_dev->dev, "%s temperature sensor registered.\n",
- indio_dev->name);
-
- return 0;
-error_free_dev:
- iio_free_device(indio_dev);
-error_ret:
- return ret;
-}
-
-static int __devexit ad7314_remove(struct spi_device *spi_dev)
-{
- struct iio_dev *indio_dev = dev_get_drvdata(&spi_dev->dev);
-
- dev_set_drvdata(&spi_dev->dev, NULL);
- iio_device_unregister(indio_dev);
-
- return 0;
-}
-
-static const struct spi_device_id ad7314_id[] = {
- { "adt7301", 0 },
- { "adt7302", 0 },
- { "ad7314", 0 },
- {}
-};
-
-static struct spi_driver ad7314_driver = {
- .driver = {
- .name = "ad7314",
- .bus = &spi_bus_type,
- .owner = THIS_MODULE,
- },
- .probe = ad7314_probe,
- .remove = __devexit_p(ad7314_remove),
- .id_table = ad7314_id,
-};
-
-static __init int ad7314_init(void)
-{
- return spi_register_driver(&ad7314_driver);
-}
-
-static __exit void ad7314_exit(void)
-{
- spi_unregister_driver(&ad7314_driver);
-}
-
-MODULE_AUTHOR("Sonic Zhang <sonic.zhang@analog.com>");
-MODULE_DESCRIPTION("Analog Devices AD7314, ADT7301 and ADT7302 digital"
- " temperature sensor driver");
-MODULE_LICENSE("GPL v2");
-
-module_init(ad7314_init);
-module_exit(ad7314_exit);
projects / karo-tx-linux.git / commitdiff