Commit Graph

11 Commits

Author SHA1 Message Date
Adrian Chadd
74ab90b71e Fix broken locking that I introduced in the previous commit. 2011-12-20 03:25:11 +00:00
Adrian Chadd
ddd7699151 Remove these locks - they aren't strictly needed and cause measurable
performance issues.

* Access to the GPIO bus is already locked by requesting
  and releasing the bus - thus the lock isn't really needed
  for each GPIO pin change.
* Don't lock and unlock the GPIO bus for -each- i2c access -
  the i2c bus code is already doing this by calling the upper
  layer callback to request/release the bus. This thus locks
  the bus for the entirety of the transaction.

TODO:

* Further verify that everything is correctly requesting/
  releasing the GPIO bus.
* Look at how to lock the GPIO pin configuration stuff,
  potentially by locking/unlocking the bus at the gpiobus
  layer.
2011-12-20 00:33:56 +00:00
Adrian Chadd
935225501b Modify the GPIO i2c bus code to allow for arbitrary data/clock
pins, rather than defaulting to 0 and 1.

This way the pin order can be reversed.  It is reversed with the
TP-Link TL-WR1043nd.

Submitted by:	Stefan Bethke <stb@lassitu.de>
2011-12-04 12:10:24 +00:00
Hans Petter Selasky
3b12bdb58f Rename device_delete_all_children() into device_delete_children().
Suggested by:	jhb @ and marius @
MFC after:	1 week
2011-11-22 21:56:55 +00:00
Marius Strobl
4b7ec27007 - There's no need to overwrite the default device method with the default
one. Interestingly, these are actually the default for quite some time
  (bus_generic_driver_added(9) since r52045 and bus_generic_print_child(9)
  since r52045) but even recently added device drivers do this unnecessarily.
  Discussed with: jhb, marcel
- While at it, use DEVMETHOD_END.
  Discussed with: jhb
- Also while at it, use __FBSDID.
2011-11-22 21:28:20 +00:00
Hans Petter Selasky
11bcf702f4 Move the device_delete_all_children() function from usb_util.c
to kern/subr_bus.c. Simplify this function so that it no longer
depends on malloc() to execute. Identify a few other places where
it makes sense to use device_delete_all_children().

MFC after:	1 week
2011-11-19 10:11:50 +00:00
Ed Schouten
a185bd12f3 Get rid of D_PSEUDO.
It seems the D_PSEUDO flag was meant to allow make_dev() to return NULL.
Nowadays we have a different interface for that; make_dev_p(). There's
no need to keep it there.

While there, remove an unneeded D_NEEDMINOR from the gpio driver.

Discussed with:	gonzo@ (gpio)
2011-10-18 08:09:44 +00:00
Andrew Thompson
54873b4cd6 Add a GPIO driver for the Gateworks Cambria platform.
The external gpio pins are connected to a PLD on the i2c bus, unfortunatley
this device does not conform by failing to send an ack after each byte written.
The iicbb driver will abort the transfer when the address is not ack'd and it
would introduce a lot of churn to be able to pass a flag down to
iicbb_start/iicbb_write. Instead we do bad things by grabbing the iicbus but
then doing our own bit banging.
2010-11-11 20:18:33 +00:00
Andrew Thompson
cac6df751b Set the pin to output on attach, we can't assume it already is.
Reviewed by:	gonzo
2010-11-08 03:08:01 +00:00
Oleksandr Tymoshenko
5f958b8534 Fix legal staff in GPIO sources:
- license clause now contains "AUTHOR AND CONTRIBUTORS"
        instead of just "AUTHOR"
    - Add license/copyright to gpioc.c

Spotted by: Edward Tomasz Napierala, Andrew Turner
2010-09-29 20:53:33 +00:00
Oleksandr Tymoshenko
6b34b16ea5 Initial GPIO bus support. Includes:
- GPIO bus controller interface
  - GPIO bus interface
  - Implementation of GPIO led(4) compatible device
  - Implementation of iic(4) bus over GPIO (author: Luiz Otavio O Souza)

Tested by: Luiz Otavio O Souza, Alexandr Rybalko
2010-09-28 03:24:53 +00:00