On 06/23/2013 10:30 PM, Peter Meerwald wrote:
> Signed-off-by: Peter Meerwald <pmeerw@xxxxxxxxxx>
Applied to the togreg branch of iio.git
> ---
> drivers/iio/dac/mcp4725.c | 64 +++++++++++++++++++++++++++++++++++++++++++++--
> 1 file changed, 62 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/iio/dac/mcp4725.c b/drivers/iio/dac/mcp4725.c
> index a612ec7..cb9db90 100644
> --- a/drivers/iio/dac/mcp4725.c
> +++ b/drivers/iio/dac/mcp4725.c
> @@ -12,14 +12,13 @@
> * driver for the Microchip I2C 12-bit digital-to-analog converter (DAC)
> * (7-bit I2C slave address 0x60, the three LSBs can be configured in
> * hardware)
> - *
> - * writing the DAC value to EEPROM is not supported
> */
>
> #include <linux/module.h>
> #include <linux/init.h>
> #include <linux/i2c.h>
> #include <linux/err.h>
> +#include <linux/delay.h>
>
> #include <linux/iio/iio.h>
> #include <linux/iio/sysfs.h>
> @@ -64,6 +63,66 @@ static SIMPLE_DEV_PM_OPS(mcp4725_pm_ops, mcp4725_suspend, mcp4725_resume);
> #define MCP4725_PM_OPS NULL
> #endif
>
> +static int mcp4725_store_eeprom(struct device *dev,
> + struct device_attribute *attr, const char *buf, size_t len)
> +{
> + struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> + struct mcp4725_data *data = iio_priv(indio_dev);
> + int tries = 20;
> + u8 inoutbuf[3];
> + bool state;
> + int ret;
> +
> + ret = strtobool(buf, &state);
> + if (ret < 0)
> + return ret;
> +
> + if (!state)
> + return 0;
> +
> + inoutbuf[0] = 0x60; /* write EEPROM */
> + inoutbuf[1] = data->dac_value >> 4;
> + inoutbuf[2] = (data->dac_value & 0xf) << 4;
> +
> + ret = i2c_master_send(data->client, inoutbuf, 3);
> + if (ret < 0)
> + return ret;
> + else if (ret != 3)
> + return -EIO;
> +
> + /* wait for write complete, takes up to 50ms */
> + while (tries--) {
> + msleep(20);
> + ret = i2c_master_recv(data->client, inoutbuf, 3);
> + if (ret < 0)
> + return ret;
> + else if (ret != 3)
> + return -EIO;
> +
> + if (inoutbuf[0] & 0x80)
> + break;
> + }
> +
> + if (tries < 0) {
> + dev_err(&data->client->dev,
> + "mcp4725_store_eeprom() failed, incomplete\n");
> + return -EIO;
> + }
> +
> + return len;
> +}
> +
> +static IIO_DEVICE_ATTR(store_eeprom, S_IWUSR, NULL, mcp4725_store_eeprom, 0);
> +
> +static struct attribute *mcp4725_attributes[] = {
> + &iio_dev_attr_store_eeprom.dev_attr.attr,
> + NULL,
> +};
> +
> +static const struct attribute_group mcp4725_attribute_group = {
> + .attrs = mcp4725_attributes,
> +};
> +
> static const struct iio_chan_spec mcp4725_channel = {
> .type = IIO_VOLTAGE,
> .indexed = 1,
> @@ -138,6 +197,7 @@ static int mcp4725_write_raw(struct iio_dev *indio_dev,
> static const struct iio_info mcp4725_info = {
> .read_raw = mcp4725_read_raw,
> .write_raw = mcp4725_write_raw,
> + .attrs = &mcp4725_attribute_group,
> .driver_module = THIS_MODULE,
> };
>
>
--
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
