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linux-stable/drivers/gpio
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Mika Westerberg 473ed7be0d gpio / ACPI: Add support for ACPI GPIO operation regions 
GPIO operation regions is a new feature introduced in ACPI 5.0
specification. This feature adds a way for platform ASL code to call back
to OS GPIO driver and toggle GPIO pins.

An example ASL code from Lenovo Miix 2 tablet with only relevant part
listed:

 Device (\_SB.GPO0)
 {
     Name (AVBL, Zero)
     Method (_REG, 2, NotSerialized)
     {
         If (LEqual (Arg0, 0x08))
         {
             // Marks the region available
             Store (Arg1, AVBL)
         }
     }

     OperationRegion (GPOP, GeneralPurposeIo, Zero, 0x0C)
     Field (GPOP, ByteAcc, NoLock, Preserve)
     {
         Connection (
             GpioIo (Exclusive, PullDefault, 0, 0, IoRestrictionOutputOnly,
                     "\\_SB.GPO0", 0x00, ResourceConsumer,,)
             {
                 0x003B
             }
         ),
         SHD3,   1,
     }
 }

 Device (SHUB)
 {
     Method (_PS0, 0, Serialized)
     {
         If (LEqual (\_SB.GPO0.AVBL, One))
         {
             Store (One, \_SB.GPO0.SHD3)
             Sleep (0x32)
         }
     }
     Method (_PS3, 0, Serialized)
     {
         If (LEqual (\_SB.GPO0.AVBL, One))
         {
             Store (Zero, \_SB.GPO0.SHD3)
         }
     }
 }

How this works is that whenever _PS0 or _PS3 method is run (typically when
SHUB device is transitioned to D0 or D3 respectively), ASL code checks if
the GPIO operation region is available (\_SB.GPO0.AVBL). If it is we go and
store either 0 or 1 to \_SB.GPO0.SHD3.

Now, when ACPICA notices ACPI GPIO operation region access (the store
above) it will call acpi_gpio_adr_space_handler() that then toggles the
GPIO accordingly using standard gpiolib interfaces.

Implement the support by registering GPIO operation region handlers for all
GPIO devices that have an ACPI handle. First time the GPIO is used by the
ASL code we make sure that the GPIO stays requested until the GPIO chip
driver itself is unloaded. If we find out that the GPIO is already
requested we just toggle it according to the value got from ASL code.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2014-03-14 17:25:02 +01:00
..
devres.c gpiolib: devres: add missing headers 2013-10-29 18:26:14 -07:00
gpio-74x164.c gpio: 74x164: Driver cleanup 2013-12-12 14:28:12 +01:00
gpio-adnp.c Merge branch 'mark-irqs' into devel 2013-12-04 14:48:17 +01:00
gpio-adp5520.c gpio/pinctrl: make gpio_chip members typed boolean 2013-12-04 14:42:46 +01:00
gpio-adp5588.c gpio: adp5588 - add support for gpio names 2014-02-13 13:52:44 +01:00
gpio-amd8111.c gpio: remove DEFINE_PCI_DEVICE_TABLE macro 2013-12-03 13:16:09 +01:00
gpio-arizona.c gpio/pinctrl: make gpio_chip members typed boolean 2013-12-04 14:42:46 +01:00
gpio-bcm-kona.c Linux 3.14-rc6 2014-03-14 10:26:45 +01:00
gpio-bt8xx.c gpio/pinctrl: make gpio_chip members typed boolean 2013-12-04 14:42:46 +01:00
gpio-clps711x.c Linux 3.14-rc6 2014-03-14 10:26:45 +01:00
gpio-cs5535.c gpio: remove use of __devexit 2012-11-28 11:39:59 -08:00
gpio-da9052.c gpio/pinctrl: make gpio_chip members typed boolean 2013-12-04 14:42:46 +01:00
gpio-da9055.c gpio/pinctrl: make gpio_chip members typed boolean 2013-12-04 14:42:46 +01:00
gpio-davinci.c gpio: davinci: fix gpio selection for OF 2014-03-11 11:14:19 +01:00
gpio-dwapb.c gpio: add a driver for the Synopsys DesignWare APB GPIO block 2014-03-05 08:59:45 +08:00
gpio-em.c Merge branch 'mark-irqs' into devel 2013-12-04 14:48:17 +01:00
gpio-ep93xx.c gpio: ep93xx: get rid of bogus __raw* accessors 2013-10-16 09:59:54 +02:00
gpio-f7188x.c gpio: f7188x: set can_sleep attribute 2014-01-07 19:02:01 +01:00
gpio-ge.c
gpio-generic.c gpio: generic: clamp retured value to [0,1] 2014-02-06 10:33:48 +01:00
gpio-grgpio.c gpio: grgpio: Staticize local symbols 2013-06-19 21:40:38 +02:00
gpio-ich.c gpio: ich: Add output levels cache support 2014-02-12 16:12:22 +01:00
gpio-intel-mid.c Linux 3.14-rc6 2014-03-14 10:26:45 +01:00
gpio-iop.c ARM: plat-iop: pass physical base for GPIO 2013-09-20 23:05:19 +02:00
gpio-it8761e.c
gpio-janz-ttl.c gpio: use dev_get_platdata() 2013-08-16 15:24:35 +02:00
gpio-kempld.c gpio/pinctrl: make gpio_chip members typed boolean 2013-12-04 14:42:46 +01:00
gpio-ks8695.c gpio/pinctrl: make gpio_chip members typed boolean 2013-12-04 14:42:46 +01:00
gpio-lp3943.c gpio: lp3943: Remove redundant of_match_ptr helper 2014-01-21 08:29:00 +00:00
gpio-lpc32xx.c gpio/pinctrl: make gpio_chip members typed boolean 2013-12-04 14:42:46 +01:00
gpio-lynxpoint.c Merge branch 'mark-irqs' into devel 2013-12-04 14:48:17 +01:00
gpio-max730x.c gpio: max730x: Remove redundant dev_set_drvdata 2014-01-02 13:54:34 +01:00
gpio-max732x.c gpio: max732x: Fix possible NULL pointer dereference on i2c_new_dummy error 2014-03-12 14:50:51 +01:00
gpio-max7300.c gpio: max7300: use devm_kzalloc() 2013-03-27 16:05:11 +01:00
gpio-max7301.c gpio: max7301: Reverting "Do not force SPI speed when using OF Platform" 2013-08-23 19:44:28 +02:00
gpio-mc9s08dz60.c gpio/pinctrl: make gpio_chip members typed boolean 2013-12-04 14:42:46 +01:00
gpio-mc33880.c gpio/pinctrl: make gpio_chip members typed boolean 2013-12-04 14:42:46 +01:00
gpio-mcp23s08.c gpio: mcp23s08: trivial: fixed coding style issues 2014-03-12 14:52:14 +01:00
gpio-ml-ioh.c gpio/pinctrl: make gpio_chip members typed boolean 2013-12-04 14:42:46 +01:00
gpio-mm-lantiq.c GPIO: MIPS: lantiq: convert gpio-mm-lantiq to OF and of_mm_gpio 2012-05-21 14:31:53 +01:00
gpio-moxart.c gpio: moxart: remove redundant dev_err call in moxart_gpio_probe() 2013-12-20 10:22:19 +01:00
gpio-mpc8xxx.c powerpc/gpio: Fix the wrong GPIO input data on MPC8572/MPC8536 2013-12-03 13:10:48 +01:00
gpio-mpc5200.c gpio: remove use of __devinit 2012-11-28 11:39:33 -08:00
gpio-msic.c gpio/pinctrl: make gpio_chip members typed boolean 2013-12-04 14:42:46 +01:00
gpio-msm-v1.c gpio_msm: Fix build error due to missing err.h 2013-07-31 00:34:31 +02:00
gpio-msm-v2.c GPIO tree bulk changes for v3.14 2014-01-21 10:09:12 -08:00
gpio-mvebu.c gpio: mvebu: use chained_irq_{enter,exit} for GIC compatibility 2014-02-12 16:23:58 +01:00
gpio-mxc.c gpio: mxc: Do not hard code return value 2014-01-02 13:55:53 +01:00
gpio-mxs.c gpio: gpio-mxs: Remove unneeded dt checks 2013-11-06 10:51:24 +01:00
gpio-octeon.c gpio/pinctrl: make gpio_chip members typed boolean 2013-12-04 14:42:46 +01:00
gpio-omap.c gpio: omap: Use devm_ioremap_resource() 2014-02-24 14:44:43 +01:00
gpio-palmas.c gpio/pinctrl: make gpio_chip members typed boolean 2013-12-04 14:42:46 +01:00
gpio-pca953x.c gpio: pca953x: Fix gpio_base may not default to -1 2014-02-13 14:04:30 +01:00
gpio-pcf857x.c gpio/pinctrl: make gpio_chip members typed boolean 2013-12-04 14:42:46 +01:00
gpio-pch.c gpio/pinctrl: make gpio_chip members typed boolean 2013-12-04 14:42:46 +01:00
gpio-pl061.c gpio: gpio-pl061: Use %pa to print 'resource_size_t' 2014-03-07 09:19:38 +08:00
gpio-pxa.c gpio: pxa: clamp gpio get value to [0,1] 2014-01-15 08:56:20 +01:00
gpio-rc5t583.c gpio: rc5t583: Remove redundant check 2014-02-24 14:51:49 +01:00
gpio-rcar.c GPIO tree bulk changes for v3.14 2014-01-21 10:09:12 -08:00
gpio-rdc321x.c gpio: use dev_get_platdata() 2013-08-16 15:24:35 +02:00
gpio-sa1100.c ARM: 7841/1: sa1100: remove complex GPIO interface 2013-10-29 11:01:02 +00:00
gpio-samsung.c ARM: S5P[v210|c100|64x0]: Fix build error 2014-01-15 13:48:06 +01:00
gpio-sch.c gpio: Don't override the error code in probe error handling 2013-05-20 20:27:30 +02:00
gpio-sch311x.c gpio: sch311x: fix compilation error 2013-12-23 18:12:48 +01:00
gpio-sodaville.c gpio: sodaville: fix some error return code on error path 2013-12-20 10:23:18 +01:00
gpio-spear-spics.c drivers/gpio: simplify use of devm_ioremap_resource 2013-08-16 17:16:31 +02:00
gpio-sta2x11.c gpio/pinctrl: make gpio_chip members typed boolean 2013-12-04 14:42:46 +01:00
gpio-stmpe.c gpio/pinctrl: make gpio_chip members typed boolean 2013-12-04 14:42:46 +01:00
gpio-stp-xway.c gpio: gpio-stp-xway.c: fix checkpatch error 2013-03-27 16:05:16 +01:00
gpio-sx150x.c gpio/pinctrl: make gpio_chip members typed boolean 2013-12-04 14:42:46 +01:00
gpio-tb10x.c gpio: tb10x: Remove redundant of_match_ptr helper 2014-01-02 14:03:22 +01:00
gpio-tc3589x.c gpio/pinctrl: make gpio_chip members typed boolean 2013-12-04 14:42:46 +01:00
gpio-tegra.c gpio: tegra: add missing error handling to probe 2013-12-11 13:37:48 +01:00
gpio-timberdale.c gpio/pinctrl: make gpio_chip members typed boolean 2013-12-04 14:42:46 +01:00
gpio-tps6586x.c gpio/pinctrl: make gpio_chip members typed boolean 2013-12-04 14:42:46 +01:00
gpio-tps65910.c gpio/pinctrl: make gpio_chip members typed boolean 2013-12-04 14:42:46 +01:00
gpio-tps65912.c gpio/pinctrl: make gpio_chip members typed boolean 2013-12-04 14:42:46 +01:00
gpio-ts5500.c gpio: use dev_get_platdata() 2013-08-16 15:24:35 +02:00
gpio-twl4030.c GPIO tree bulk changes for v3.14 2014-01-21 10:09:12 -08:00
gpio-twl6040.c gpio/pinctrl: make gpio_chip members typed boolean 2013-12-04 14:42:46 +01:00
gpio-tz1090-pdc.c gpio-tz1090-pdc: add TZ1090 PDC gpio driver 2013-07-20 19:03:48 +02:00
gpio-tz1090.c gpio-tz1090: Replace commas with semi-colons 2014-03-07 11:57:00 +08:00
gpio-ucb1400.c Linux 3.13-rc3 2013-12-09 14:04:37 +01:00
gpio-viperboard.c gpio/pinctrl: make gpio_chip members typed boolean 2013-12-04 14:42:46 +01:00
gpio-vr41xx.c gpio: remove use of __devexit 2012-11-28 11:39:59 -08:00
gpio-vx855.c gpio/pinctrl: make gpio_chip members typed boolean 2013-12-04 14:42:46 +01:00
gpio-wm831x.c gpio/pinctrl: make gpio_chip members typed boolean 2013-12-04 14:42:46 +01:00
gpio-wm8350.c gpio/pinctrl: make gpio_chip members typed boolean 2013-12-04 14:42:46 +01:00
gpio-wm8994.c gpio/pinctrl: make gpio_chip members typed boolean 2013-12-04 14:42:46 +01:00
gpio-xilinx.c GPIO: xilinx: Use BIT macro 2013-06-17 07:47:33 +02:00
gpio-xtensa.c gpio: xtensa: fix build when XCHAL_HAVE_CP is 0 2014-02-03 09:11:45 +01:00
gpio-zevio.c gpio: New driver for LSI ZEVIO SoCs 2014-02-27 10:30:42 +01:00
gpiolib-acpi.c gpio / ACPI: Add support for ACPI GPIO operation regions 2014-03-14 17:25:02 +01:00
gpiolib-of.c gpio: gpiolib-of: Use PTR_ERR_OR_ZERO 2014-02-06 10:33:46 +01:00
gpiolib.c gpio: clamp returned values to the boolean range 2014-03-14 10:17:03 +01:00
gpiolib.h gpiolib: Allow GPIO chips to request their own GPIOs 2014-03-13 10:32:18 +01:00
Kconfig Linux 3.14-rc6 2014-03-14 10:26:45 +01:00
Makefile gpio: remove obsolete tnetv107x driver 2014-03-05 10:44:44 +08:00