From: Sonic Zhang <sonic.zhang@xxxxxxxxxx> Signed-off-by: Sonic Zhang <sonic.zhang@xxxxxxxxxx> Signed-off-by: Mike Frysinger <vapier@xxxxxxxxxx> --- drivers/staging/iio/adc/Kconfig | 7 + drivers/staging/iio/adc/Makefile | 1 + drivers/staging/iio/adc/ad7314.c | 308 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 316 insertions(+), 0 deletions(-) create mode 100644 drivers/staging/iio/adc/ad7314.c diff --git a/drivers/staging/iio/adc/Kconfig b/drivers/staging/iio/adc/Kconfig index 847f5f2..6d3b8bc 100644 --- a/drivers/staging/iio/adc/Kconfig +++ b/drivers/staging/iio/adc/Kconfig @@ -54,3 +54,10 @@ config AD7298 help Say yes here to build support for Analog Devices AD7298 temperature sensors and ADC. + +config AD7314 + tristate "Analog Devices AD7314 temperature sensor driver" + depends on SPI + help + Say yes here to build support for Analog Devices AD7314 + temperature sensors. diff --git a/drivers/staging/iio/adc/Makefile b/drivers/staging/iio/adc/Makefile index d0ea747..04fd93b 100644 --- a/drivers/staging/iio/adc/Makefile +++ b/drivers/staging/iio/adc/Makefile @@ -10,3 +10,4 @@ obj-$(CONFIG_AD7150) += ad7150.o obj-$(CONFIG_AD7152) += ad7152.o obj-$(CONFIG_AD7291) += ad7291.o obj-$(CONFIG_AD7298) += ad7298.o +obj-$(CONFIG_AD7314) += ad7314.o diff --git a/drivers/staging/iio/adc/ad7314.c b/drivers/staging/iio/adc/ad7314.c new file mode 100644 index 0000000..8c17b1f --- /dev/null +++ b/drivers/staging/iio/adc/ad7314.c @@ -0,0 +1,308 @@ +/* + * AD7314 digital temperature sensor driver for AD7314, ADT7301 and ADT7302 + * + * Copyright 2010 Analog Devices Inc. + * + * Licensed under the GPL-2 or later. + */ + +#include <linux/interrupt.h> +#include <linux/gpio.h> +#include <linux/workqueue.h> +#include <linux/device.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/sysfs.h> +#include <linux/list.h> +#include <linux/spi/spi.h> +#include <linux/rtc.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 { + const char *name; + struct spi_device *spi_dev; + struct iio_dev *indio_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 = dev_info->dev_data; + + 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 = dev_info->dev_data; + 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 = dev_info->dev_data; + 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(chip->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 ssize_t ad7314_show_name(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad7314_chip_info *chip = dev_info->dev_data; + return sprintf(buf, "%s\n", chip->name); +} + +static IIO_DEVICE_ATTR(name, S_IRUGO, ad7314_show_name, 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, + &iio_dev_attr_name.dev_attr.attr, + NULL, +}; + +static const struct attribute_group ad7314_attribute_group = { + .attrs = ad7314_attributes, +}; + +/* + * device probe and remove + */ + +static int __devinit ad7314_probe(struct spi_device *spi_dev) +{ + struct ad7314_chip_info *chip; + int ret = 0; + + chip = kzalloc(sizeof(struct ad7314_chip_info), GFP_KERNEL); + + if (chip == NULL) + return -ENOMEM; + + /* this is only used for device removal purposes */ + dev_set_drvdata(&spi_dev->dev, chip); + + chip->spi_dev = spi_dev; + chip->name = spi_dev->modalias; + + chip->indio_dev = iio_allocate_device(); + if (chip->indio_dev == NULL) { + ret = -ENOMEM; + goto error_free_chip; + } + + chip->indio_dev->dev.parent = &spi_dev->dev; + chip->indio_dev->attrs = &ad7314_attribute_group; + chip->indio_dev->dev_data = (void *)chip; + chip->indio_dev->driver_module = THIS_MODULE; + + ret = iio_device_register(chip->indio_dev); + if (ret) + goto error_free_dev; + + dev_info(&spi_dev->dev, "%s temperature sensor registered.\n", + chip->name); + + return 0; +error_free_dev: + iio_free_device(chip->indio_dev); +error_free_chip: + kfree(chip); + + return ret; +} + +static int __devexit ad7314_remove(struct spi_device *spi_dev) +{ + struct ad7314_chip_info *chip = dev_get_drvdata(&spi_dev->dev); + struct iio_dev *indio_dev = chip->indio_dev; + + dev_set_drvdata(&spi_dev->dev, NULL); + if (spi_dev->irq) + iio_unregister_interrupt_line(indio_dev, 0); + iio_device_unregister(indio_dev); + iio_free_device(chip->indio_dev); + kfree(chip); + + 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@xxxxxxxxxx>"); +MODULE_DESCRIPTION("Analog Devices AD7314, ADT7301 and ADT7302 digital" + " temperature sensor driver"); +MODULE_LICENSE("GPL v2"); + +module_init(ad7314_init); +module_exit(ad7314_exit); -- 1.7.3.2 -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html