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51c1064e82
linux/drivers/gpio
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Bartosz Golaszewski 51c1064e82 gpiolib: add new ioctl() for monitoring changes in line info 
Currently there is no way for user-space to be informed about changes
in status of GPIO lines e.g. when someone else requests the line or its
config changes. We can only periodically re-read the line-info. This
is fine for simple one-off user-space tools, but any daemon that provides
a centralized access to GPIO chips would benefit hugely from an event
driven line info synchronization.

This patch adds a new ioctl() that allows user-space processes to reuse
the file descriptor associated with the character device for watching
any changes in line properties. Every such event contains the updated
line information.

Currently the events are generated on three types of status changes: when
a line is requested, when it's released and when its config is changed.
The first two are self-explanatory. For the third one: this will only
happen when another user-space process calls the new SET_CONFIG ioctl()
as any changes that can happen from within the kernel (i.e.
set_transitory() or set_debounce()) are of no interest to user-space.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
2020-02-12 12:05:47 +01:00
..
gpio-74x164.c gpio: 74x164: utilize the for_each_set_clump8 macro 2019-12-04 19:44:12 -08:00
gpio-74xx-mmio.c gpio: Use new GPIO_LINE_DIRECTION 2019-11-07 09:27:48 +01:00
gpio-104-dio-48e.c gpio: 104-dio-48e: utilize for_each_set_clump8 macro 2019-12-04 19:44:12 -08:00
gpio-104-idi-48.c gpio: 104-idi-48: utilize for_each_set_clump8 macro 2019-12-04 19:44:12 -08:00
gpio-104-idio-16.c gpio: Use new GPIO_LINE_DIRECTION 2019-11-07 09:27:48 +01:00
gpio-adnp.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
gpio-adp5520.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 149 2019-05-30 11:25:18 -07:00
gpio-adp5588.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 149 2019-05-30 11:25:18 -07:00
gpio-altera-a10sr.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 201 2019-05-30 11:29:52 -07:00
gpio-altera.c gpio: altera: change to platform_get_irq_optional to avoid false-positive error 2020-01-09 10:35:05 +01:00
gpio-amd8111.c gpio: amd8111: Include proper header 2018-01-13 22:22:49 +01:00
gpio-amd-fch.c gpio: Use new GPIO_LINE_DIRECTION 2019-11-07 09:27:48 +01:00
gpio-amdpt.c Bulk GPIO changes for the v5.3 kernel cycle: 2019-07-09 09:07:00 -07:00
gpio-arizona.c gpio: arizona: Use local copy of pdata 2019-08-05 11:42:29 +02:00
gpio-aspeed-sgpio.c gpio: aspeed-sgpio: fixed typos 2020-01-23 16:16:05 +01:00
gpio-aspeed.c gpio: aspeed-sgpio: fixed typos 2020-01-23 16:16:05 +01:00
gpio-ath79.c gpio: ath79: use devm_platform_ioremap_resource() 2019-10-09 18:20:19 +02:00
gpio-bcm-kona.c gpio: bcm-kona: use platform_irq_count 2019-12-11 11:06:31 +01:00
gpio-bd9571mwv.c gpio: Use new GPIO_LINE_DIRECTION 2019-11-07 09:27:48 +01:00
gpio-bd70528.c This is the bulk of GPIO changes for the v5.5 kernel cycle 2019-12-01 17:56:50 -08:00
gpio-bd71828.c gpio: bd71828: Initial support for ROHM BD71828 PMIC GPIOs 2020-01-24 07:23:10 +00:00
gpio-brcmstb.c gpio: Remove dev_err() usage after platform_get_irq() 2019-08-05 13:25:34 +02:00
gpio-bt8xx.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 61 2019-05-24 17:36:45 +02:00
gpio-cadence.c gpio: cadence: Pass irqchip when adding gpiochip 2019-08-15 09:44:19 +02:00
gpio-clps711x.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
gpio-creg-snps.c gpio: aspeed-sgpio: fixed typos 2020-01-23 16:16:05 +01:00
gpio-crystalcove.c gpio: crystalcove: Convert to use SPDX identifier 2019-02-08 15:55:40 +02:00
gpio-cs5535.c docs: driver-model: move it to the driver-api book 2019-07-15 11:03:02 -03:00
gpio-da9052.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
gpio-da9055.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
gpio-davinci.c gpio: davinci: silence error prints in case of EPROBE_DEFER 2019-07-15 11:52:34 +02:00
gpio-dln2.c gpio: Use new GPIO_LINE_DIRECTION 2019-11-07 09:27:48 +01:00
gpio-dwapb.c gpiolib: acpi: Split ACPI stuff to gpiolib-acpi.h 2019-07-31 00:57:21 +02:00
gpio-eic-sprd.c gpio: eic: sprd: Fix the incorrect EIC offset when toggling 2019-10-01 11:50:40 +02:00
gpio-em.c gpio: em: Use platform_get_irq() to obtain interrupts 2019-11-13 13:47:48 +01:00
gpio-ep93xx.c gpio: ep93xx: Pass irqchip when adding gpiochip 2019-09-04 10:59:10 +02:00
gpio-exar.c gpio: Use new GPIO_LINE_DIRECTION 2019-11-07 09:27:48 +01:00
gpio-f7188x.c gpio: Use new GPIO_LINE_DIRECTION 2019-11-07 09:27:48 +01:00
gpio-ftgpio010.c gpio: ftgpio: Fix an error handling path in 'ftgpio_gpio_probe()' 2019-08-23 12:02:34 +02:00
gpio-ge.c gpio: ge: Fix build warning 2018-05-16 14:35:24 +02:00
gpio-gpio-mm.c gpio: gpio-mm: utilize for_each_set_clump8 macro 2019-12-04 19:44:12 -08:00
gpio-grgpio.c gpio: Remove the unused flags 2020-01-15 11:24:19 +01:00
gpio-gw-pld.c gpio: Add a Gateworks PLD GPIO driver 2019-02-09 11:33:37 +01:00
gpio-hlwd.c gpio: hlwd: Pass irqchip when adding gpiochip 2019-08-15 09:57:29 +02:00
gpio-htc-egpio.c gpio: Use new GPIO_LINE_DIRECTION 2019-11-07 09:27:48 +01:00
gpio-ich.c gpio: Use new GPIO_LINE_DIRECTION 2019-11-07 09:27:48 +01:00
gpio-intel-mid.c gpio: intel-mid: Move hardware initialization to callback 2019-10-15 01:18:51 +02:00
gpio-iop.c Merge branch 'i2c/for-5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2019-07-15 21:10:39 -07:00
gpio-it87.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 300 2019-06-05 17:37:00 +02:00
gpio-ixp4xx.c gpio: updates for v5.4 2019-09-03 16:04:19 +02:00
gpio-janz-ttl.c Bulk GPIO changes for the v5.3 kernel cycle: 2019-07-09 09:07:00 -07:00
gpio-kempld.c gpio: Use new GPIO_LINE_DIRECTION 2019-11-07 09:27:48 +01:00
gpio-logicvc.c gpio: Add support for the Xylon LogiCVC GPIOs 2019-12-13 09:50:29 +01:00
gpio-loongson1.c drivers: gpio: loongon1: use devm_platform_ioremap_resource() 2019-04-05 00:04:26 +07:00
gpio-loongson.c MIPS: Loongson64: Rename CPU TYPES 2019-10-31 15:03:10 -07:00
gpio-lp873x.c gpio: Use new GPIO_LINE_DIRECTION 2019-11-07 09:27:48 +01:00
gpio-lp3943.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 372 2019-06-05 17:37:10 +02:00
gpio-lp87565.c gpio: Use new GPIO_LINE_DIRECTION 2019-11-07 09:27:48 +01:00
gpio-lpc18xx.c drivers: gpio: lpc18xx: use devm_platform_ioremap_resource() 2019-04-05 00:04:26 +07:00
gpio-lpc32xx.c gpio: lpc32xx: allow building on non-lpc32xx targets 2019-08-15 21:33:07 +02:00
gpio-madera.c gpio: Use new GPIO_LINE_DIRECTION 2019-11-07 09:27:48 +01:00
gpio-max730x.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
gpio-max732x.c Bulk GPIO changes for the v5.3 kernel cycle: 2019-07-09 09:07:00 -07:00
gpio-max3191x.c gpio: max3191x: utilize the for_each_set_clump8 macro 2019-12-04 19:44:13 -08:00
gpio-max7300.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
gpio-max7301.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
gpio-max77620.c This is the bulk of GPIO changes for the v5.5 kernel cycle 2019-12-01 17:56:50 -08:00
gpio-max77650.c gpio: max77650: add MODULE_ALIAS() 2019-07-29 00:03:52 +02:00
gpio-mb86s7x.c gpiolib: acpi: Split ACPI stuff to gpiolib-acpi.h 2019-07-31 00:57:21 +02:00
gpio-mc9s08dz60.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 2019-05-30 11:26:37 -07:00
gpio-mc33880.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 176 2019-05-30 11:29:19 -07:00
gpio-menz127.c drivers: mcb: use symbol namespaces 2019-11-03 19:54:53 +01:00
gpio-merrifield.c gpio: merrifield: Pass irqchip when adding gpiochip 2019-11-13 15:30:53 +02:00
gpio-ml-ioh.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 167 2019-05-30 11:26:39 -07:00
gpio-mlxbf.c gpio: mlxbf: remove unused including <linux/version.h> 2019-04-08 08:47:06 +02:00
gpio-mm-lantiq.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
gpio-mmio.c gpio: mmio: remove untrue leftover comment 2019-11-13 13:49:42 +01:00
gpio-mockup.c Linux 5.5-rc6 2020-01-17 08:59:29 +01:00
gpio-moxtet.c gpio: Use new GPIO_LINE_DIRECTION 2019-11-07 09:27:48 +01:00
gpio-mpc8xxx.c Linux 5.5-rc6 2020-01-17 08:59:29 +01:00
gpio-mpc5200.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 333 2019-06-05 17:37:06 +02:00
gpio-msic.c gpio: msic: Convert to use SPDX identifier 2019-02-08 15:55:41 +02:00
gpio-mt7621.c gpio: Drop the chained IRQ handler assign function 2020-01-23 15:54:32 +01:00
gpio-mvebu.c gpio: mvebu: clear irq in edge cause register before unmask edge irq 2020-01-23 15:52:40 +01:00
gpio-mxc.c gpio: mxc: Only get the second IRQ when there is more than one IRQ 2019-10-01 11:24:18 +02:00
gpio-mxs.c gpio: Use new GPIO_LINE_DIRECTION 2019-11-07 09:27:48 +01:00
gpio-octeon.c drivers: gpio: octeon: use devm_platform_ioremap_resource() 2019-04-05 00:04:27 +07:00
gpio-omap.c gpio: Use new GPIO_LINE_DIRECTION 2019-11-07 09:27:48 +01:00
gpio-palmas.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 201 2019-05-30 11:29:52 -07:00
gpio-pca953x.c Linux 5.5-rc6 2020-01-17 08:59:29 +01:00
gpio-pcf857x.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 61 2019-05-24 17:36:45 +02:00
gpio-pch.c gpio: pch: Use dev_get_drvdata 2019-07-23 18:59:05 +03:00
gpio-pci-idio-16.c gpio: pci-idio-16: utilize for_each_set_clump8 macro 2019-12-04 19:44:12 -08:00
gpio-pcie-idio-24.c gpio: pcie-idio-24: utilize for_each_set_clump8 macro 2019-12-04 19:44:12 -08:00
gpio-pisosr.c gpio: pisosr: utilize the for_each_set_clump8 macro 2019-12-04 19:44:13 -08:00
gpio-pl061.c gpio: Use new GPIO_LINE_DIRECTION 2019-11-07 09:27:48 +01:00
gpio-pmic-eic-sprd.c gpio: Remove dev_err() usage after platform_get_irq() 2019-08-05 13:25:34 +02:00
gpio-pxa.c gpio: pxa: Avoid a warning when gpio0 and gpio1 IRQS are not there 2020-02-10 10:50:58 +01:00
gpio-raspberrypi-exp.c gpio: Use new GPIO_LINE_DIRECTION 2019-11-07 09:27:48 +01:00
gpio-rc5t583.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 201 2019-05-30 11:29:52 -07:00
gpio-rcar.c gpio: rcar: Use proper irq_chip name 2019-11-12 16:30:30 +01:00
gpio-rda.c gpio: Add RDA Micro GPIO controller support 2019-10-29 15:12:52 +01:00
gpio-rdc321x.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 61 2019-05-24 17:36:45 +02:00
gpio-reg.c gpio: Use new GPIO_LINE_DIRECTION 2019-11-07 09:27:48 +01:00
gpio-sa1100.c gpio: Use new GPIO_LINE_DIRECTION 2019-11-07 09:27:48 +01:00
gpio-sama5d2-piobu.c gpio: remove unneeded MODULE_VERSION() usage 2019-12-12 17:09:50 +01:00
gpio-sch311x.c gpio: Use new GPIO_LINE_DIRECTION 2019-11-07 09:27:48 +01:00
gpio-sch.c gpio: Use new GPIO_LINE_DIRECTION 2019-11-07 09:27:48 +01:00
gpio-sifive.c gpio/sifive: Add GPIO driver for SiFive SoCs 2020-01-20 19:10:03 +00:00
gpio-siox.c gpio: Use new GPIO_LINE_DIRECTION 2019-11-07 09:27:48 +01:00
gpio-sodaville.c gpio: sodaville: Convert to use SPDX identifier 2018-12-07 17:34:08 +02:00
gpio-spear-spics.c drivers: gpio: spear-spics: use devm_platform_ioremap_resource() 2019-04-05 00:04:27 +07:00
gpio-sprd.c gpio: Remove dev_err() usage after platform_get_irq() 2019-08-05 13:25:34 +02:00
gpio-sta2x11.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 333 2019-06-05 17:37:06 +02:00
gpio-stmpe.c gpio: Use new GPIO_LINE_DIRECTION 2019-11-07 09:27:48 +01:00
gpio-stp-xway.c Bulk GPIO changes for the v5.3 kernel cycle: 2019-07-09 09:07:00 -07:00
gpio-syscon.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
gpio-tb10x.c gpio: remove unneeded MODULE_VERSION() usage 2019-12-12 17:09:50 +01:00
gpio-tc3589x.c gpio: Use new GPIO_LINE_DIRECTION 2019-11-07 09:27:48 +01:00
gpio-tegra186.c gpiolib: Add support for the irqdomain which doesn't use irq_fwspec as arg 2020-01-15 11:17:44 +01:00
gpio-tegra.c gpio: tegra: Use NOIRQ phase for suspend/resume 2019-12-20 10:58:23 +01:00
gpio-thunderx.c gpio: thunderx: Switch to GPIOLIB_IRQCHIP 2020-01-15 11:18:29 +01:00
gpio-timberdale.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 176 2019-05-30 11:29:19 -07:00
gpio-tpic2810.c gpio: Use new GPIO_LINE_DIRECTION 2019-11-07 09:27:48 +01:00
gpio-tps6586x.c gpio: tps65xxx: Use SPDX license tag 2018-09-04 08:22:47 +02:00
gpio-tps65086.c gpio: Use new GPIO_LINE_DIRECTION 2019-11-07 09:27:48 +01:00
gpio-tps65218.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 111 2019-05-24 17:39:01 +02:00
gpio-tps65910.c gpio: tps65xxx: Use SPDX license tag 2018-09-04 08:22:47 +02:00
gpio-tps65912.c gpio: Use new GPIO_LINE_DIRECTION 2019-11-07 09:27:48 +01:00
gpio-tps68470.c gpio: Use new GPIO_LINE_DIRECTION 2019-11-07 09:27:48 +01:00
gpio-tqmx86.c gpio: Use new GPIO_LINE_DIRECTION 2019-11-07 09:27:48 +01:00
gpio-ts4800.c drivers: gpio: ts4800: use devm_platform_ioremap_resource() 2019-04-05 00:04:28 +07:00
gpio-ts4900.c gpio: Use new GPIO_LINE_DIRECTION 2019-11-07 09:27:48 +01:00
gpio-ts5500.c gpio: ts5500: Delete platform data handling 2018-09-04 08:22:47 +02:00
gpio-twl4030.c gpio: Use new GPIO_LINE_DIRECTION 2019-11-07 09:27:48 +01:00
gpio-twl6040.c gpio: Use new GPIO_LINE_DIRECTION 2019-11-07 09:27:48 +01:00
gpio-ucb1400.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
gpio-uniphier.c gpio: uniphier: utilize for_each_set_clump8 macro 2019-12-04 19:44:12 -08:00
gpio-vf610.c gpio: vf610: Pass irqchip when adding gpiochip 2019-08-23 09:41:18 +02:00
gpio-viperboard.c gpio: viperboard: Replace 'unsigned' with 'unsigned int' 2019-08-05 11:26:58 +02:00
gpio-vr41xx.c gpio: vr41xx: Use devm_platform_ioremap_resource() 2019-06-27 15:56:51 +01:00
gpio-vx855.c gpio: vx855: fixed a typo 2020-01-15 13:45:01 +01:00
gpio-wcd934x.c gpio: wcd934x: Fix logic of wcd_gpio_get 2020-02-10 10:50:58 +01:00
gpio-wcove.c gpio: Use new GPIO_LINE_DIRECTION 2019-11-07 09:27:48 +01:00
gpio-winbond.c gpio: winbond: Add driver 2018-01-09 14:51:00 +01:00
gpio-wm831x.c gpio: wm8xxx: Cut down on boilerplate 2018-09-17 10:55:24 -07:00
gpio-wm8350.c gpio: wm8xxx: Cut down on boilerplate 2018-09-17 10:55:24 -07:00
gpio-wm8994.c gpio: wm8xxx: Cut down on boilerplate 2018-09-17 10:55:24 -07:00
gpio-ws16c48.c gpio: ws16c48: utilize for_each_set_clump8 macro 2019-12-04 19:44:12 -08:00
gpio-xgene-sb.c gpiolib: acpi: Split ACPI stuff to gpiolib-acpi.h 2019-07-31 00:57:21 +02:00
gpio-xgene.c gpio: Use new GPIO_LINE_DIRECTION 2019-11-07 09:27:48 +01:00
gpio-xgs-iproc.c This is the bulk of pin control changes for the v5.6 kernel cycle: 2020-01-29 09:51:36 -08:00
gpio-xilinx.c Bulk GPIO changes for the v5.3 kernel cycle: 2019-07-09 09:07:00 -07:00
gpio-xlp.c gpio: xlp: Pass irqchip when adding gpiochip 2019-08-15 09:55:07 +02:00
gpio-xra1403.c gpio: Use new GPIO_LINE_DIRECTION 2019-11-07 09:27:48 +01:00
gpio-xtensa.c gpio: xtensa: fix driver build 2019-12-09 10:40:18 +01:00
gpio-zevio.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
gpio-zx.c gpio: zx: Pass irqchip when adding gpiochip 2019-08-23 09:40:44 +02:00
gpio-zynq.c gpio: zynq: Fix for bug in zynq_gpio_restore_context API 2020-01-07 11:24:44 +01:00
gpiolib-acpi.c gpiolib: acpi: Add honor_wakeup module-option + quirk mechanism 2020-01-07 12:58:15 +01:00
gpiolib-acpi.h gpiolib: acpi: make acpi_can_fallback_to_crs() static 2019-09-10 11:34:20 +01:00
gpiolib-devprop.c gpiolib: devprop: Fix syntax error 2019-04-08 11:20:12 +02:00
gpiolib-devres.c treewide: remove redundant IS_ERR() before error code check 2020-02-04 03:05:27 +00:00
gpiolib-legacy.c gpio: Use SPDX header for core library 2018-09-25 09:08:48 +02:00
gpiolib-of.c treewide: remove redundant IS_ERR() before error code check 2020-02-04 03:05:27 +00:00
gpiolib-of.h gpio: of: Make of_get_named_gpiod_flags() private 2019-09-11 14:45:01 +01:00
gpiolib-sysfs.c gpiolib: Add GPIOCHIP_NAME definition 2019-12-12 11:36:13 +01:00
gpiolib.c gpiolib: add new ioctl() for monitoring changes in line info 2020-02-12 12:05:47 +01:00
gpiolib.h gpiolib: add new ioctl() for monitoring changes in line info 2020-02-12 12:05:47 +01:00
Kconfig - New Drivers 2020-02-03 14:51:57 +00:00
Makefile - New Drivers 2020-02-03 14:51:57 +00:00
TODO gpio: Update TODO 2020-01-09 03:01:33 +01:00