src/sys/dev/gpio, branch release/10.1.0

MFC r266922:

2014-08-20T17:39:53Z

Add a bounds verification to the SCL and SDA pin values. At attach, print the SCL and SDA pin numbers. Remove a stray blank line. Remove the GPIOBUS locking from gpioiic_reset(), it is already called with this lock held. This fixes a crash when you try to scan the iicbus with i2c(8).

MFC r265012, r265191, r265289, r265310

2014-05-15T15:15:23Z

r265012: Fix the gpio-specifier decoding by respecting the GPIO controller's #gpio-cells property. Add a new ofw_bus method (OFW_BUS_MAP_GPIOS()) that allows the GPIO controller to implement its own mapping to deal with gpio-specifiers, allowing the decoding of gpio-specifiers to be controller specific. The default ofw_bus_map_gpios() decodes the linux standard (#gpio-cells = <2>) and the FreeBSD standard (#gpio-cells = <3>). It pass the gpio-specifier flag field to the children as an ivar variable so they can act upon. r265191: Remove unnecessary headers. Sort out the headers. Add a missing header on ofw_gpiobus.c (it was working because of sys/libkern.h). r265289: eally sort out the headers. sys/systm.h must always come after sys/param.h. Remove sys/types.h which should never be included together with sys/param.h. Add sys/malloc.h for correctness even if it seems to don't be needed. Remove more unused headers found by unusedinc (from bde@). r265310: Move gpiobus routines to dev/gpio. Avoid polluting ofw_bus with bus specific parts.

MFC r258046, r258047, r258050, r259035, r259036, r259037, r261842, r261843,

2014-05-15T01:27:53Z

r261844, r261845, r261846, r262194, r262522, r262559 r258046: Fix a typo on a comment in ofw_bus_if.m, the default method will return -1 when a node doesn't exist. r258047: Move the KASSERT() check to the point before the increase of number of pins. r258050: Fix gpiobus to return BUS_PROBE_GENERIC insted of BUS_PROBE_SPECIFIC (0) so it can be overriden by its OFW/FDT version. Give a chance for GPIO devices that implement the device_identify method to attach. r259035: Remove unnecessary includes and an unused softc variable. While here apply two minor style(9) fixes. r259036: Move the GPIOBUS_SET_PINFLAGS(..., ..., pin, GPIO_PIN_OUTPUT) to led(4) control callback function. This makes gpioled(4) works even if the pin is accidentally set to an input. r259037: Fix the pin value reading on AM335x. Because of the inverted logic it was always returning '0' for all the reads, even for the outputs. It is now known to work with gpioiic(4) and gpioled(4). r261842: Add an OFW GPIO compatible bus. This allows the use of the DTS files to describe GPIO bindings in the system. Move the GPIOBUS lock macros to gpiobusvar.h as they are now shared between the OFW and the non OFW versions of GPIO bus. Export gpiobus_print_pins() so it can also be used on the OFW GPIO bus. r261843: Add OFW support to the in tree gpio compatible devices: gpioiic(4) and gpioled(4). Tested on RPi and BBB (using the hardware I2C controller and gpioiic(4) for the I2C tests). It was also verified for regressions on RSPRO (MIPS/ar71xx) used as reference for a non OFW-based system. Update the gpioled(4) and gpioiic(4) man pages with some details and examples about the FDT/OFW support. Some compatibility details pointed out by imp@ will follow in subsequent commits. r261844: Allow the use of OFW I2C bus together with iicbb(4) on OFW-based systems. This change makes ofw_iicbus attach to iicbb(4) controllers in addition to the already supported i2c host bridges (iichb). On iicbb(4) allow the direct access of the OFW parent node by its children, so they can be directly attached to iicbb(4) node on the DTS without the need of describing the i2c bus. r261845: Allow the use of the OFW GPIO bus for ti_gpio and bcm2835_gpio. With this change the gpio children can be described as directly connected to the GPIO controller without the need of describing the OFW GPIO bus itself on the DTS file. With this commit the OFW GPIO bus is fully functional on BBB and RPi. GPIO controllers which want to use the OFW GPIO bus will need similar changes. r261846: Make the gpioled(4) work out of the box on BBB. Add gpioled(4) to BEAGLEBONE kernel and add the description of the four on-board leds of beaglebone-black to its DTS file. r262194: Remove an unnecessary header. r262522: Fix make depend for iicbus. r262559: Inspired by r262522, fix make depend. This fixes the build of gpio modules.

Minor printf nit to keep out clean

2013-09-05T16:38:26Z

Properly free gpiobus ivars when gpiobus_parse_pins() fails and also on

2013-08-28T14:39:24Z

gpiobus detachment. Suggested by: imp Approved by: adrian (mentor)

Style fixes

2012-11-23T19:20:38Z

- Remove C++ - style comments - Use proper device name in panic messages

Remove extra semicolon which rendered condition useless

2012-04-02T00:11:26Z

Submitted by: Stefan Farfelder

Fix broken locking that I introduced in the previous commit.

2011-12-20T03:25:11Z

Remove these locks - they aren't strictly needed and cause measurable

2011-12-20T00:33:56Z

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.

Modify the GPIO i2c bus code to allow for arbitrary data/clock

2011-12-04T12:10:24Z

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