diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2016-12-13 07:54:57 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-12-13 07:54:57 -0800 |
| commit | 061ad5038ca5ac75419204b216bddc2806008ead (patch) | |
| tree | edd48af16a121d6a457f5e29119cac91b3a9c61c /drivers/gpio/gpiolib-devprop.c | |
| parent | e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba (diff) | |
| parent | acf1fcf77247efa01d7213f53082451f6c9c8f3b (diff) | |
Merge tag 'gpio-v4.10-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio
Pull GPIO updates from Luinus Walleij:
"Bulk GPIO changes for the v4.10 kernel cycle:
Core changes:
- Simplify threaded interrupt handling: instead of passing numbed
parameters to gpiochip_irqchip_add_chained() we create a new call:
gpiochip_irqchip_add_nested() so the two types are clearly
semantically different. Also make sure that all nested chips call
gpiochip_set_nested_irqchip() which is necessary for IRQ resend to
work properly if it happens.
- Return error on seek operations for the chardev.
- Clamp values set as part of gpio[d]_direction_output() so that
anything != 0 will be send down to the driver as "1" not the value
passed in.
- ACPI can now support naming of GPIO lines, hogs and holes in the
GPIO lists.
New drivers:
- The SX150x driver was deemed unfit for the GPIO subsystem and was
moved over to a combined GPIO+pinctrl driver in the pinctrl
subsystem.
New features:
- Various cleanups to various drivers"
* tag 'gpio-v4.10-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio: (49 commits)
gpio: merrifield: Implement gpio_get_direction callback
gpio: merrifield: Add support for hardware debouncer
gpio: chardev: Return error for seek operations
gpio: arizona: Tidy up probe error path
gpio: arizona: Remove pointless set of platform drvdata
gpio: pl061: delete platform data handling
gpio: pl061: move platform data into driver
gpio: pl061: rename variable from chip to pl061
gpio: pl061: rename state container struct
gpio: pl061: use local state for parent IRQ storage
gpio: set explicit nesting on drivers
gpio: simplify adding threaded interrupts
gpio: vf610: use builtin_platform_driver
gpio: axp209: use correct register for GPIO input status
gpio: stmpe: fix interrupt handling bug
gpio: em: depnd on ARCH_SHMOBILE
gpio: zx: depend on ARCH_ZX
gpio: x86: update config dependencies for x86 specific hardware
gpio: mb86s7x: use builtin_platform_driver
gpio: etraxfs: use builtin_platform_driver
...
Diffstat (limited to 'drivers/gpio/gpiolib-devprop.c')
| -rw-r--r-- | drivers/gpio/gpiolib-devprop.c | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/drivers/gpio/gpiolib-devprop.c b/drivers/gpio/gpiolib-devprop.c new file mode 100644 index 000000000000..27f383bda7d9 --- /dev/null +++ b/drivers/gpio/gpiolib-devprop.c @@ -0,0 +1,67 @@ +/* + * Device property helpers for GPIO chips. + * + * Copyright (C) 2016, Intel Corporation + * Author: Mika Westerberg <mika.westerberg@linux.intel.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/property.h> +#include <linux/slab.h> +#include <linux/gpio/consumer.h> +#include <linux/gpio/driver.h> + +#include "gpiolib.h" + +/** + * devprop_gpiochip_set_names - Set GPIO line names using device properties + * @chip: GPIO chip whose lines should be named, if possible + * + * Looks for device property "gpio-line-names" and if it exists assigns + * GPIO line names for the chip. The memory allocated for the assigned + * names belong to the underlying firmware node and should not be released + * by the caller. + */ +void devprop_gpiochip_set_names(struct gpio_chip *chip) +{ + struct gpio_device *gdev = chip->gpiodev; + const char **names; + int ret, i; + + if (!chip->parent) { + dev_warn(&gdev->dev, "GPIO chip parent is NULL\n"); + return; + } + + ret = device_property_read_string_array(chip->parent, "gpio-line-names", + NULL, 0); + if (ret < 0) + return; + + if (ret != gdev->ngpio) { + dev_warn(chip->parent, + "names %d do not match number of GPIOs %d\n", ret, + gdev->ngpio); + return; + } + + names = kcalloc(gdev->ngpio, sizeof(*names), GFP_KERNEL); + if (!names) + return; + + ret = device_property_read_string_array(chip->parent, "gpio-line-names", + names, gdev->ngpio); + if (ret < 0) { + dev_warn(chip->parent, "failed to read GPIO line names\n"); + kfree(names); + return; + } + + for (i = 0; i < gdev->ngpio; i++) + gdev->descs[i].name = names[i]; + + kfree(names); +} |