On Thu, 2011-09-29 at 08:11 -0400, Jonathan Cameron wrote:
> Currently dropped power down mode support.
> V2: Fixes:
> - messed up use of cache aligned store fixed.
> - correct output format to be milli degrees.
> - add documentation file.
>
> Signed-off-by: Jonathan Cameron <jic23@xxxxxxxxx>
Hi Jonathan,
almost there ...
> ---
> Untested, but trivial port.
>
> Documentation/hwmon/ad7314 | 25 ++++++
> drivers/hwmon/Kconfig | 10 +++
> drivers/hwmon/Makefile | 1 +
> drivers/hwmon/ad7314.c | 176 ++++++++++++++++++++++++++++++++++++++++++++
> 4 files changed, 212 insertions(+), 0 deletions(-)
>
> diff --git a/Documentation/hwmon/ad7314 b/Documentation/hwmon/ad7314
> new file mode 100644
> index 0000000..1b026a0
> --- /dev/null
> +++ b/Documentation/hwmon/ad7314
> @@ -0,0 +1,25 @@
> +Kernel driver ad7314
> +====================
> +
> +Supported chips:
> + * Analog Devices AD7314
> + Prefx: 'ad7314'
> + Datasheet: Publicaly available at Analog Devices website.
> + * Analog Devices ADT7301
> + Prefx: 'adt7301'
> + Datasheet: Publicaly available at Analog Devices website.
> + * Analog Devices ADT7302
> + Prefx: 'adt7302'
> + Datasheet: Publicaly available at Analog Devices website.
Publicaly -> Publicly
> +
> +Description
> +-----------
> +
> +Driver supports the above parts. The ad7314 has a 10 bit
> +sensor with 1lsb = 0.25 degrees centigrade. The adt7301 and
> +adt7302 have 14 bit sensors with 1lsb = 0.03125 degrees centigrade.
> +
> +Notes
> +-----
> +
> +Currently power down mode is not supported.
> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
> index 0b62c3c..e5d4daa 100644
> --- a/drivers/hwmon/Kconfig
> +++ b/drivers/hwmon/Kconfig
> @@ -68,6 +68,16 @@ config SENSORS_ABITUGURU3
> This driver can also be built as a module. If so, the module
> will be called abituguru3.
>
> +config SENSORS_AD7314
> + tristate "Analog Devices AD7314 and compatibles"
> + depends on SPI && EXPERIMENTAL
> + help
> + If you say yes here you get support for the Analog Devices
> + AD7314, ADT7301 and ADT7302 temperature sensors.
> +
> + This driver can also be built as a module. If so, the module
> + will be called ad7314.
> +
> config SENSORS_AD7414
> tristate "Analog Devices AD7414"
> depends on I2C && EXPERIMENTAL
> diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
> index 3c9ccef..228a4b7 100644
> --- a/drivers/hwmon/Makefile
> +++ b/drivers/hwmon/Makefile
> @@ -21,6 +21,7 @@ obj-$(CONFIG_SENSORS_W83791D) += w83791d.o
>
> obj-$(CONFIG_SENSORS_ABITUGURU) += abituguru.o
> obj-$(CONFIG_SENSORS_ABITUGURU3)+= abituguru3.o
> +obj-$(CONFIG_SENSORS_AD7314) += ad7314.o
> obj-$(CONFIG_SENSORS_AD7414) += ad7414.o
> obj-$(CONFIG_SENSORS_AD7418) += ad7418.o
> obj-$(CONFIG_SENSORS_ADCXX) += adcxx.o
> diff --git a/drivers/hwmon/ad7314.c b/drivers/hwmon/ad7314.c
> new file mode 100644
> index 0000000..a1fea9b
> --- /dev/null
> +++ b/drivers/hwmon/ad7314.c
> @@ -0,0 +1,176 @@
> +/*
> + * AD7314 digital temperature sensor driver for AD7314, ADT7301 and ADT7302
> + *
> + * Copyright 2010 Analog Devices Inc.
> + *
> + * Licensed under the GPL-2 or later.
> + *
> + * Conversion to hwmon from IIO done by Jonathan Cameron <jic23@xxxxxxxxx>
> + */
> +#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 <linux/hwmon.h>
> +#include <linux/hwmon-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
> +
> +/*
> + * ADT7301 and ADT7302 temperature masks
> + */
> +#define ADT7301_TEMP_SIGN 0x2000
> +#define ADT7301_TEMP_MASK 0x3FFF
> +
> +enum ad7314_variant {
> + adt7301,
> + adt7302,
> + ad7314,
> +};
> +
> +struct ad7314_data {
> + struct spi_device *spi_dev;
> + struct device *hwmon_dev;
> + u16 rx ____cacheline_aligned;
> +};
> +
> +static int ad7314_spi_read(struct ad7314_data *chip, s16 *data)
> +{
> + int ret;
> +
> + ret = spi_read(chip->spi_dev, (u8 *)&chip->rx, sizeof(chip->rx));
> + if (ret < 0) {
> + dev_err(&chip->spi_dev->dev, "SPI read error\n");
> + return ret;
> + }
> +
> + *data = be16_to_cpu(chip->rx);
> +
> + return ret;
> +}
> +
> +static ssize_t ad7314_show_temperature(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct ad7314_data *chip = dev_get_drvdata(dev);
> + s16 data;
> + int ret;
> +
> + ret = ad7314_spi_read(chip, &data);
> + if (ret < 0)
> + return ret;
> + switch (spi_get_device_id(chip->spi_dev)->driver_data) {
> + case ad7314:
> + data = (data & AD7314_TEMP_MASK) >> AD7314_TEMP_OFFSET;
> + data = (data << 6) >> 6;
> +
> + return sprintf(buf, "%d\n", 250 * data);
> + case adt7301:
> + case adt7302:
> + /*
> + * Documented as a 13 bit twos complement register
> + * with a sign bit - which is a 14 bit 2's complement
> + * register. 1lsb - 31.25 milli degrees centigrade
> + */
> + data &= ADT7301_TEMP_MASK;
> + data = (data << 2) >> 2;
> +
> + return sprintf(buf, "%d\n", (3125 * (int)data)/100);
You don't need a typecast here (like with the first sprintf). There
should be spaces around '/' (CodingStyle 3.1).
Even better would be to use
DIV_ROUND_CLOSEST(data * 3125, 100)
to reduce the rounding error.
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO,
> + ad7314_show_temperature, NULL, 0);
> +
> +static struct attribute *ad7314_attributes[] = {
> + &sensor_dev_attr_temp1_input.dev_attr.attr,
> + NULL,
> +};
> +
> +static const struct attribute_group ad7314_group = {
> + .attrs = ad7314_attributes,
> +};
> +
> +static int __devinit ad7314_probe(struct spi_device *spi_dev)
> +{
> + int ret;
> + struct ad7314_data *chip;
> +
> + chip = kzalloc(sizeof(*chip), GFP_KERNEL);
> + if (chip == NULL) {
> + ret = -ENOMEM;
> + goto error_ret;
> + }
> + dev_set_drvdata(&spi_dev->dev, chip);
> +
> + ret = sysfs_create_group(&spi_dev->dev.kobj, &ad7314_group);
> + if (ret < 0)
> + goto error_free_chip;
> +
Something missing here which I didn't notice at first ... but you do
remove the hwmon device below, so it makes sense to create it ;).
chip->hwmon_dev = hwmon_device_register(&spi_dev->dev);
if (IS_ERR(chip->hwmon_dev)) {
err = PTR_ERR(chip->hwmon_dev);
goto error_remove_group;
}
> + return 0;
error_remove_group:
sysfs_remove_group(&spi_dev->dev.kobj, &ad7314_group);
> +error_free_chip:
> + kfree(chip);
> +error_ret:
> + return ret;
> +}
> +
> +static int __devexit ad7314_remove(struct spi_device *spi_dev)
> +{
> + struct ad7314_data *chip = dev_get_drvdata(&spi_dev->dev);
> +
> + hwmon_device_unregister(chip->hwmon_dev);
> + sysfs_remove_group(&spi_dev->dev.kobj, &ad7314_group);
> + kfree(chip);
> +
> + return 0;
> +}
> +
> +static const struct spi_device_id ad7314_id[] = {
> + { "adt7301", adt7301 },
> + { "adt7302", adt7302 },
> + { "ad7314", ad7314 },
> + {}
> +};
> +
> +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);
> +}
> +module_init(ad7314_init);
> +
> +static __exit void ad7314_exit(void)
> +{
> + spi_unregister_driver(&ad7314_driver);
> +}
> +module_exit(ad7314_exit);
> +
> +MODULE_AUTHOR("Sonic Zhang <sonic.zhang@xxxxxxxxxx>");
> +MODULE_DESCRIPTION("Analog Devices AD7314, ADT7301 and ADT7302 digital"
> + " temperature sensor driver");
> +MODULE_LICENSE("GPL v2");
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