On Wednesday, October 07, 2009 1:01 PM, Daniel Mack wrote:
> This is actually too trivial to publish, but to export the function of
> that chip to the userspace, a module like this is needed.
>
> Signed-off-by: Daniel Mack <[email protected]>
> Cc: Andrew Morton <[email protected]>
> Cc: David Brownell <[email protected]>
> Cc: [email protected]
> ---
[snip]
> +static ssize_t dac7512_store_val(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t count)
> +{
> + struct spi_device *spi = to_spi_device(dev);
> + unsigned char tmp[2];
> + unsigned long val;
> +
> + if (strict_strtoul(buf, 10, &val) < 0)
> + return -EINVAL;
> +
> + tmp[0] = val >> 8;
> + tmp[1] = val & 0xff;
> + spi_write(spi, tmp, sizeof(tmp));
> + return count;
> +}
> +
> +static DEVICE_ATTR(value, S_IWUSR | S_IRUGO,
> + NULL, dac7512_store_val);
You have declared the "value" device attribute with mode S_IWUSR | S_IRUGO
but have not provided a show callback.
Regards,
Hartley
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