diff options
Diffstat (limited to 'drivers/staging/iio/adc/ad7314.c')
-rw-r--r-- | drivers/staging/iio/adc/ad7314.c | 281 |
1 files changed, 0 insertions, 281 deletions
diff --git a/drivers/staging/iio/adc/ad7314.c b/drivers/staging/iio/adc/ad7314.c deleted file mode 100644 index 9070d9cac725..000000000000 --- a/drivers/staging/iio/adc/ad7314.c +++ /dev/null @@ -1,281 +0,0 @@ -/* - * 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 "../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); - iio_free_device(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); |