On 10/15/2014 04:49 AM, Octavian Purdila wrote:
On Tue, Oct 14, 2014 at 6:41 PM, Guenter Roeck <linux@xxxxxxxxxxxx> wrote:
On Tue, Oct 14, 2014 at 05:48:14PM +0300, Octavian Purdila wrote:
This patch adds three new sysfs files: bus_frequency,
bus_min_frequency and bus_max_frequency which allows the user to view
or change the bus frequency on a per bus level.
<snip>
+
+static DEVICE_ATTR(bus_frequency, S_IRUGO, i2c_sysfs_freq_show,
+ i2c_sysfs_freq_store);
Consider using DEVICE_ATTR_RO here. Also, extra empty line.
Unfortunately that won't work because we must transform bus_frequency
to a RW entry (via is_visible) if the bus can change the frequency. We
Ah yes, you are right.
can't use DEVIE_ATTR_RW either, because transforming a RW entry to a
RO entry with is visible is not possible:
Why not ?
is_visible returns the desired mode. Just like you can return mode | S_IWUSR,
you can return mode & ~S_IWUSR.
Am I missing something ?
Guenter
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