kernel-ark/include/asm-generic
David Brownell d2876d08d8 gpiolib: add gpio provider infrastructure
Provide new implementation infrastructure that platforms may choose to use
when implementing the GPIO programming interface.  Platforms can update their
GPIO support to use this.  In many cases the incremental cost to access a
non-inlined GPIO should be less than a dozen instructions, with the memory
cost being about a page (total) of extra data and code.  The upside is:

  * Providing two features which were "want to have (but OK to defer)" when
    GPIO interfaces were first discussed in November 2006:

    -	A "struct gpio_chip" to plug in GPIOs that aren't directly supported
	by SOC platforms, but come from FPGAs or other multifunction devices
	using conventional device registers (like UCB-1x00 or SM501 GPIOs,
	and southbridges in PCs with more open specs than usual).

    -	Full support for message-based GPIO expanders, where registers are
	accessed through sleeping I/O calls.  Previous support for these
	"cansleep" calls was just stubs.  (One example: the widely used
	pcf8574 I2C chips, with 8 GPIOs each.)

  * Including a non-stub implementation of the gpio_{request,free}() calls,
    making those calls much more useful.  The diagnostic labels are also
    recorded given DEBUG_FS, so /sys/kernel/debug/gpio can show a snapshot
    of all GPIOs known to this infrastructure.

The driver programming interfaces introduced in 2.6.21 do not change at all;
this infrastructure is entirely below those covers.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Jean Delvare <khali@linux-fr.org>
Cc: Eric Miao <eric.miao@marvell.com>
Cc: Haavard Skinnemoen <hskinnemoen@atmel.com>
Cc: Philipp Zabel <philipp.zabel@gmail.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Ben Gardner <bgardner@wabtec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-02-05 09:44:12 -08:00
..
bitops ext4: Add ext4_find_next_bit() 2008-01-28 23:58:27 -05:00
4level-fixup.h
atomic.h atomic.h: atomic_add_unless as inline. Remove system.h atomic.h circular dependency 2007-05-08 11:15:20 -07:00
audit_change_attr.h
audit_dir_write.h
audit_read.h
audit_signal.h [PATCH] add SIGNAL syscall class (v3) 2007-05-11 05:38:25 -04:00
audit_write.h
bitops.h forbid asm/bitops.h direct inclusion 2007-10-19 11:53:41 -07:00
bug.h debug: move WARN_ON() out of line 2008-01-30 13:32:50 +01:00
cputime.h
device.h
div64.h
dma-mapping-broken.h dma-mapping: prevent dma dependent code from linking on !HAS_DMA archs 2007-07-16 09:05:45 -07:00
dma-mapping.h
emergency-restart.h
errno-base.h
errno.h
fcntl.h Introduce O_CLOEXEC 2007-07-16 09:05:45 -07:00
futex.h
gpio.h gpiolib: add gpio provider infrastructure 2008-02-05 09:44:12 -08:00
ide_iops.h
ioctl.h
iomap.h
irq_regs.h
Kbuild remove include/asm-*/ipc.h 2007-10-17 08:42:55 -07:00
Kbuild.asm unexport asm/shmparam.h 2007-10-17 08:42:47 -07:00
kdebug.h move die notifier handling to common code 2007-05-08 11:15:04 -07:00
libata-portmap.h libata-portmap: Remove unused definitions 2007-10-12 14:55:37 -04:00
local.h local_t: architecture independent extension 2007-05-08 11:15:20 -07:00
memory_model.h Generic Virtual Memmap support for SPARSEMEM 2007-10-16 09:42:51 -07:00
mm_hooks.h [PATCH] x86: PARAVIRT: add hooks to intercept mm creation and destruction 2007-05-02 19:27:14 +02:00
mman.h
mutex-dec.h
mutex-null.h
mutex-xchg.h
page.h
pci-dma-compat.h
pci.h
percpu.h x86/non-x86: percpu, node ids, apic ids x86.git fixup 2008-01-30 13:33:32 +01:00
pgtable-nopmd.h
pgtable-nopud.h
pgtable.h flush icache before set_pte() on ia64: flush icache at set_pte 2007-10-16 09:42:59 -07:00
poll.h Consolidate asm/poll.h 2007-05-11 08:29:34 -07:00
resource.h sched: SCHED_FIFO/SCHED_RR watchdog timer 2008-01-25 21:08:27 +01:00
rtc.h x86: fix RTC lockdep warning: potential hardirq recursion 2008-02-04 16:48:10 +01:00
sections.h
siginfo.h
signal.h
statfs.h
termios.h Define termios_1 functions for powerpc, s390, avr32 and frv 2007-09-12 09:08:05 -07:00
tlb.h asm-generic/tlb.h: remove <linux/quicklist.h> 2008-02-04 16:48:00 +01:00
topology.h
uaccess.h
unaligned.h use __val in __get_unaligned 2007-07-31 15:39:42 -07:00
vmlinux.lds.h x86: add testcases for RODATA and NX protections/attributes 2008-01-30 13:34:08 +01:00
xor.h