The PWM duty cycle frequenty attributes are improperly named
(fanN_div instead of pwmN_div) and contain raw values instead of
actual frequencies. Rename them and fix their contents.

Also improve the logic when the user asks for a new frequency, to
always pick the closest supported frequency. The algorithm could
certainly be optimized, but the operation is infrequent enough that
I don't think it's worth the effort.
Signed-off-by: NJean Delvare <khali@linux-fr.org>

The W83795G can be configured to set the in0, in1 and/or in2 voltage
limits dynamically based on VID input pins. Switch the respective
sysfs attributes to read-only.
Signed-off-by: NJean Delvare <khali@linux-fr.org>

Misplaced parentheses caused the wrong register value to be read,
resulting in random LSB for fan speed values and limits.
Signed-off-by: NJean Delvare <khali@linux-fr.org>

* The data structure is zalloc'd, so no need to set individual fields
  to 0 explicitly.
* Refactor the handling of pins that can be used for either
  temperature or voltage monitoring.
* Misc other clean-ups.
Signed-off-by: NJean Delvare <khali@linux-fr.org>

Gain bit set means 1x gain and cleared means 8x gain, not the other
way around.
Signed-off-by: NJean Delvare <khali@linux-fr.org>

This saves an SMBus write if monitoring was already enabled.
Signed-off-by: NJean Delvare <khali@linux-fr.org>

Attribute structures can be made const. Same for the I2C address
list.
Signed-off-by: NJean Delvare <khali@linux-fr.org>

Only create fan[1-8]_target files when the fan in question can be
controlled (PWM output is present.) Also name these files according
to the standard.
Signed-off-by: NJean Delvare <khali@linux-fr.org>

Use a dedicated 2D array for PWM attributes. This way, PWM attributes
are handled the same way as other attributes, this is more consistent.
Signed-off-by: NJean Delvare <khali@linux-fr.org>

Use 2D arrays for in, fan, temp and dts device attributes. Using
linear arrays is too risky as we have to skip some groups depending
on the device model and configuration. Adding or removing an
attribute would let the driver build silently but then it would crash
at runtime. With 2D arrays, the consistency checking happens at build
time, which is much safer.
Signed-off-by: NJean Delvare <khali@linux-fr.org>

Functions w83795_create_files and w83795_remove_files iterate over
the same set of files, just calling a different function. Merge them
into a single function which takes the action as a parameter. This
saves code, and also ensure that file creation and deletion are in
sync.
Signed-off-by: NJean Delvare <khali@linux-fr.org>

Function w83795_probe() is way too big, move file creation to a separate
function to make it more readable.
Signed-off-by: NJean Delvare <khali@linux-fr.org>

Sysfs files must be removed on device removal but also when device
registration fails. Move the code to a separate function to avoid
code redundancy.
Signed-off-by: NJean Delvare <khali@linux-fr.org>

Check for additional identification registers. Improve debugging
messages on failed detection.
Signed-off-by: NJean Delvare <khali@linux-fr.org>

Move the bank selection code to a separate function, to avoid
duplicating it in read and write functions. Improve error reporting
on register access error.
Signed-off-by: NJean Delvare <khali@linux-fr.org>

Enum chips and chip_types are redundant, get rid of the former. Fix
the detection code to properly identify the chip variant and name the
client accordingly.
Signed-off-by: NJean Delvare <khali@linux-fr.org>

* Improve driver description.
* Drop unused macro.
* Drop unreachable code.
Signed-off-by: NJean Delvare <khali@linux-fr.org>

There is still much work needed, but I wanted to give Wei the credit
he deserves. I've merged some of my own fixes already, to make
gcc and checkpatch happy. Individual fixes and improvements from me
will follow.

[JD: Fix build errors]
[JD: Coding style cleanups]
[JD: Get rid of forward declarations]
[JD: Drop VID support]
[JD: Drop fault output control feature]
[JD: Use lowercase for inline function names]
[JD: Use strict variants of the strtol/ul functions]
[JD: Shorten the read and write function names]
Signed-off-by: NJean Delvare <khali@linux-fr.org>