On Wed, Dec 21, 2011 at 06:09:52PM -0800, Christopher Heiny wrote:
> +
> +/* Helper fn to convert a byte array representing a short in the RMI
> + * endian-ness to a short in the native processor's specific endianness.
> + * We don't use ntohs/htons here because, well, we're not dealing with
> + * a pair of shorts. And casting dest to short* wouldn't work, because
> + * that would imply knowing the byte order of short in the first place.
> + */
> +static inline void batohs(unsigned short *dest, unsigned char *src)
> +{
> + *dest = src[1] * 0x100 + src[0];
> +}
> +
> +/* Helper function to convert a short (in host processor endianess) to
> + * a byte array in the RMI endianess for shorts. See above comment for
> + * why we dont us htons or something like that.
> + */
> +static inline void hstoba(unsigned char *dest, unsigned short src)
> +{
> + dest[0] = src % 0x100;
> + dest[1] = src / 0x100;
> +}
We have nice set of be/le16_to_cpu and cpu_to_be/le16 helpers that do
just that and in much more efficient way.
> +
> +/* Utility routine to handle writes to read-only attributes. Hopefully
> + * this will never happen, but if the user does something stupid, we don't
> + * want to accept it quietly (which is what can happen if you just put NULL
> + * for the attribute's store function).
> + */
> +static inline ssize_t rmi_store_error(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t count)
> +{
> + dev_warn(dev,
> + "RMI4 WARNING: Attempt to write %d characters to read-only "
> + "attribute %s.", count, attr->attr.name);
> + return -EPERM;
> +}
> +
> +/* Utility routine to handle reads of write-only attributes. Hopefully
> + * this will never happen, but if the user does something stupid, we don't
> + * want to accept it quietly (which is what can happen if you just put NULL
> + * for the attribute's show function).
> + */
> +static inline ssize_t rmi_show_error(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + dev_warn(dev,
> + "RMI4 WARNING: Attempt to read from write-only attribute %s.",
> + attr->attr.name);
> + return -EPERM;
> +}
Although these methods are not needed, a general comment nonetheless: do
not put in header files and mark inline functions which address is taken
and used elsewhere.
Thanks.
--
Dmitry
--
To unsubscribe from this list: send the line "unsubscribe linux-input" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
