Merge tag 'gpio-v4.4-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio

Pull GPIO updates from Linus Walleij:
 "Here is the bulk of GPIO changes for the v4.4 development cycle.

  The only changes hitting outside drivers/gpio are in the pin control
  subsystem and these seem to have settled nicely in linux-next.

  Development mistakes and catfights are nicely documented in the
  reverts as you can see.  The outcome of the ABI fight is that we're
  working on a chardev ABI for GPIO now, where hope to show results for
  the v4.5 kernel.

  Summary of changes:

  GPIO core:
   - Define and handle flags for open drain/open collector and open
     source/open emitter, also know as "single-ended" configurations.
   - Generic request/free operations that handle calling out to the
     (optional) pin control backend.
   - Some refactoring related to an ABI change that did not happen, yet
     provide useful.
   - Added a real-time compliance checklist.  Many GPIO chips have
     irqchips, and need to think this over with the RT patches going
     upstream.
   - Restructure, fix and clean up Kconfig menus a bit.

  New drivers:
   - New driver for AMD Promony.
   - New driver for ACCES 104-IDIO-16, a port-mapped I/O card,
     ISA-style.  Very retro.

  Subdriver changes:
   - OMAP changes to handle real time requirements.
   - Handle trigger types for edge and level IRQs on PL061 properly.  As
     this hardware is very common it needs to set a proper example for
     others to follow.
   - Some container_of() cleanups.
   - Delete the unused MSM driver in favor of the driver that is
     embedded inside the pin control driver.
   - Cleanup of the ath79 GPIO driver used by many, many OpenWRT router
     targets.
   - A consolidated IT87xx driver replacing the earlier very specific
     IT8761e driver.
   - Handle the TI TCA9539 in the PCA953x driver.  Also handle ACPI
     devices in this subdriver.
   - Drop xilinx arch dependencies as these FPGAs seem to profilate over
     a few different architectures.  MIPS and ARM come to mind"

* tag 'gpio-v4.4-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio: (57 commits)
  gpio: fix up SPI submenu
  gpio: drop surplus I2C dependencies
  gpio: drop surplus X86 dependencies
  gpio: dt-bindings: document the official use of "ngpios"
  gpio: MAINTAINERS: Add an entry for the ATH79 GPIO driver
  gpio / ACPI: Allow shared GPIO event to be read via operation region
  gpio: group port-mapped I/O drivers in a menu
  gpio: Add ACCES 104-IDIO-16 driver maintainer entry
  gpio: zynq: Document interrupt-controller DT binding
  gpio: xilinx: Drop architecture dependencies
  gpio: generic: Revert to old error handling in bgpio_map
  gpio: add a real time compliance notes
  Revert "gpio: add a real time compliance checklist"
  gpio: Add GPIO support for the ACCES 104-IDIO-16
  gpio: driver for AMD Promontory
  gpio: xlp: Convert to use gpiolib irqchip helpers
  gpio: add a real time compliance checklist
  gpio/xilinx: enable for MIPS
  gpiolib: Add and use OF_GPIO_SINGLE_ENDED flag
  gpiolib: Split GPIO flags parsing and GPIO configuration
  ...

1 files changed, 216 insertions, 0 deletions

diff --git a/drivers/gpio/gpio-104-idio-16.c b/drivers/gpio/gpio-104-idio-16.c
new file mode 100644
index 000000000000..5400d7d4d8fd
--- /dev/null
+++ b/drivers/gpio/gpio-104-idio-16.c
@@ -0,0 +1,216 @@
+/*
+ * GPIO driver for the ACCES 104-IDIO-16 family
+ * Copyright (C) 2015 William Breathitt Gray
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ */
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/gpio/driver.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock.h>
+
+static unsigned idio_16_base;
+module_param(idio_16_base, uint, 0);
+MODULE_PARM_DESC(idio_16_base, "ACCES 104-IDIO-16 base address");
+
+/**
+ * struct idio_16_gpio - GPIO device private data structure
+ * @chip:	instance of the gpio_chip
+ * @lock:	synchronization lock to prevent gpio_set race conditions
+ * @base:	base port address of the GPIO device
+ * @extent:	extent of port address region of the GPIO device
+ * @out_state:	output bits state
+ */
+struct idio_16_gpio {
+	struct gpio_chip chip;
+	spinlock_t lock;
+	unsigned base;
+	unsigned extent;
+	unsigned out_state;
+};
+
+static int idio_16_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
+{
+	if (offset > 15)
+		return 1;
+
+	return 0;
+}
+
+static int idio_16_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
+{
+	return 0;
+}
+
+static int idio_16_gpio_direction_output(struct gpio_chip *chip,
+	unsigned offset, int value)
+{
+	chip->set(chip, offset, value);
+	return 0;
+}
+
+static struct idio_16_gpio *to_idio16gpio(struct gpio_chip *gc)
+{
+	return container_of(gc, struct idio_16_gpio, chip);
+}
+
+static int idio_16_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+	struct idio_16_gpio *const idio16gpio = to_idio16gpio(chip);
+	const unsigned BIT_MASK = 1U << (offset-16);
+
+	if (offset < 16)
+		return -EINVAL;
+
+	if (offset < 24)
+		return !!(inb(idio16gpio->base + 1) & BIT_MASK);
+
+	return !!(inb(idio16gpio->base + 5) & (BIT_MASK>>8));
+}
+
+static void idio_16_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+	struct idio_16_gpio *const idio16gpio = to_idio16gpio(chip);
+	const unsigned BIT_MASK = 1U << offset;
+	unsigned long flags;
+
+	if (offset > 15)
+		return;
+
+	spin_lock_irqsave(&idio16gpio->lock, flags);
+
+	if (value)
+		idio16gpio->out_state |= BIT_MASK;
+	else
+		idio16gpio->out_state &= ~BIT_MASK;
+
+	if (offset > 7)
+		outb(idio16gpio->out_state >> 8, idio16gpio->base + 4);
+	else
+		outb(idio16gpio->out_state, idio16gpio->base);
+
+	spin_unlock_irqrestore(&idio16gpio->lock, flags);
+}
+
+static int __init idio_16_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct idio_16_gpio *idio16gpio;
+	int err;
+
+	const unsigned BASE = idio_16_base;
+	const unsigned EXTENT = 8;
+	const char *const NAME = dev_name(dev);
+
+	idio16gpio = devm_kzalloc(dev, sizeof(*idio16gpio), GFP_KERNEL);
+	if (!idio16gpio)
+		return -ENOMEM;
+
+	if (!request_region(BASE, EXTENT, NAME)) {
+		dev_err(dev, "Unable to lock %s port addresses (0x%X-0x%X)\n",
+			NAME, BASE, BASE + EXTENT);
+		err = -EBUSY;
+		goto err_lock_io_port;
+	}
+
+	idio16gpio->chip.label = NAME;
+	idio16gpio->chip.dev = dev;
+	idio16gpio->chip.owner = THIS_MODULE;
+	idio16gpio->chip.base = -1;
+	idio16gpio->chip.ngpio = 32;
+	idio16gpio->chip.get_direction = idio_16_gpio_get_direction;
+	idio16gpio->chip.direction_input = idio_16_gpio_direction_input;
+	idio16gpio->chip.direction_output = idio_16_gpio_direction_output;
+	idio16gpio->chip.get = idio_16_gpio_get;
+	idio16gpio->chip.set = idio_16_gpio_set;
+	idio16gpio->base = BASE;
+	idio16gpio->extent = EXTENT;
+	idio16gpio->out_state = 0xFFFF;
+
+	spin_lock_init(&idio16gpio->lock);
+
+	dev_set_drvdata(dev, idio16gpio);
+
+	err = gpiochip_add(&idio16gpio->chip);
+	if (err) {
+		dev_err(dev, "GPIO registering failed (%d)\n", err);
+		goto err_gpio_register;
+	}
+
+	return 0;
+
+err_gpio_register:
+	release_region(BASE, EXTENT);
+err_lock_io_port:
+	return err;
+}
+
+static int idio_16_remove(struct platform_device *pdev)
+{
+	struct idio_16_gpio *const idio16gpio = platform_get_drvdata(pdev);
+
+	gpiochip_remove(&idio16gpio->chip);
+	release_region(idio16gpio->base, idio16gpio->extent);
+
+	return 0;
+}
+
+static struct platform_device *idio_16_device;
+
+static struct platform_driver idio_16_driver = {
+	.driver = {
+		.name = "104-idio-16"
+	},
+	.remove = idio_16_remove
+};
+
+static void __exit idio_16_exit(void)
+{
+	platform_device_unregister(idio_16_device);
+	platform_driver_unregister(&idio_16_driver);
+}
+
+static int __init idio_16_init(void)
+{
+	int err;
+
+	idio_16_device = platform_device_alloc(idio_16_driver.driver.name, -1);
+	if (!idio_16_device)
+		return -ENOMEM;
+
+	err = platform_device_add(idio_16_device);
+	if (err)
+		goto err_platform_device;
+
+	err = platform_driver_probe(&idio_16_driver, idio_16_probe);
+	if (err)
+		goto err_platform_driver;
+
+	return 0;
+
+err_platform_driver:
+	platform_device_del(idio_16_device);
+err_platform_device:
+	platform_device_put(idio_16_device);
+	return err;
+}
+
+module_init(idio_16_init);
+module_exit(idio_16_exit);
+
+MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>");
+MODULE_DESCRIPTION("ACCES 104-IDIO-16 GPIO driver");
+MODULE_LICENSE("GPL");