1 files changed, 0 insertions, 746 deletions

diff --git a/packages/kexecboot/linux-kexecboot-2.6.24/tosa/0022-Provide-new-implementation-infrastructure-that-platf.patch b/packages/kexecboot/linux-kexecboot-2.6.24/tosa/0022-Provide-new-implementation-infrastructure-that-platf.patch
deleted file mode 100644
index f39fedbbaa..0000000000
--- a/packages/kexecboot/linux-kexecboot-2.6.24/tosa/0022-Provide-new-implementation-infrastructure-that-platf.patch
+++ /dev/null
@@ -1,746 +0,0 @@
-From 3a0251c01446f3a6763e4406ca5495102db63aa4 Mon Sep 17 00:00:00 2001
-From: David Brownell <dbrownell@users.sourceforge.net>
-Date: Fri, 18 Jan 2008 00:35:20 +0300
-Subject: [PATCH 22/64] 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>
----
- drivers/gpio/Makefile      |    2 +
- drivers/gpio/gpiolib.c     |  567 ++++++++++++++++++++++++++++++++++++++++++++
- include/asm-generic/gpio.h |   98 ++++++++
- 3 files changed, 667 insertions(+), 0 deletions(-)
- create mode 100644 drivers/gpio/gpiolib.c
-
-diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
-index cdbba6b..2db28ce 100644
---- a/drivers/gpio/Makefile
-+++ b/drivers/gpio/Makefile
-@@ -1,3 +1,5 @@
- # gpio support: dedicated expander chips, etc
- 
- ccflags-$(CONFIG_DEBUG_GPIO)	+= -DDEBUG
-+
-+obj-$(CONFIG_HAVE_GPIO_LIB)	+= gpiolib.o
-diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
-new file mode 100644
-index 0000000..d8db2f8
---- /dev/null
-+++ b/drivers/gpio/gpiolib.c
-@@ -0,0 +1,567 @@
-+#include <linux/kernel.h>
-+#include <linux/module.h>
-+#include <linux/irq.h>
-+#include <linux/spinlock.h>
-+
-+#include <asm/gpio.h>
-+
-+
-+/* Optional implementation infrastructure for GPIO interfaces.
-+ *
-+ * Platforms may want to use this if they tend to use very many GPIOs
-+ * that aren't part of a System-On-Chip core; or across I2C/SPI/etc.
-+ *
-+ * When kernel footprint or instruction count is an issue, simpler
-+ * implementations may be preferred.  The GPIO programming interface
-+ * allows for inlining speed-critical get/set operations for common
-+ * cases, so that access to SOC-integrated GPIOs can sometimes cost
-+ * only an instruction or two per bit.
-+ */
-+
-+
-+/* When debugging, extend minimal trust to callers and platform code.
-+ * Also emit diagnostic messages that may help initial bringup, when
-+ * board setup or driver bugs are most common.
-+ *
-+ * Otherwise, minimize overhead in what may be bitbanging codepaths.
-+ */
-+#ifdef	DEBUG
-+#define	extra_checks	1
-+#else
-+#define	extra_checks	0
-+#endif
-+
-+/* gpio_lock prevents conflicts during gpio_desc[] table updates.
-+ * While any GPIO is requested, its gpio_chip is not removable;
-+ * each GPIO's "requested" flag serves as a lock and refcount.
-+ */
-+static DEFINE_SPINLOCK(gpio_lock);
-+
-+struct gpio_desc {
-+	struct gpio_chip	*chip;
-+	unsigned long		flags;
-+/* flag symbols are bit numbers */
-+#define FLAG_REQUESTED	0
-+#define FLAG_IS_OUT	1
-+
-+#ifdef CONFIG_DEBUG_FS
-+	const char		*label;
-+#endif
-+};
-+static struct gpio_desc gpio_desc[ARCH_NR_GPIOS];
-+
-+static inline void desc_set_label(struct gpio_desc *d, const char *label)
-+{
-+#ifdef CONFIG_DEBUG_FS
-+	d->label = label;
-+#endif
-+}
-+
-+/* Warn when drivers omit gpio_request() calls -- legal but ill-advised
-+ * when setting direction, and otherwise illegal.  Until board setup code
-+ * and drivers use explicit requests everywhere (which won't happen when
-+ * those calls have no teeth) we can't avoid autorequesting.  This nag
-+ * message should motivate switching to explicit requests...
-+ */
-+static void gpio_ensure_requested(struct gpio_desc *desc)
-+{
-+	if (test_and_set_bit(FLAG_REQUESTED, &desc->flags) == 0) {
-+		pr_warning("GPIO-%d autorequested\n", (int)(desc - gpio_desc));
-+		desc_set_label(desc, "[auto]");
-+	}
-+}
-+
-+/* caller holds gpio_lock *OR* gpio is marked as requested */
-+static inline struct gpio_chip *gpio_to_chip(unsigned gpio)
-+{
-+	return gpio_desc[gpio].chip;
-+}
-+
-+/**
-+ * gpiochip_add() - register a gpio_chip
-+ * @chip: the chip to register, with chip->base initialized
-+ * Context: potentially before irqs or kmalloc will work
-+ *
-+ * Returns a negative errno if the chip can't be registered, such as
-+ * because the chip->base is invalid or already associated with a
-+ * different chip.  Otherwise it returns zero as a success code.
-+ */
-+int gpiochip_add(struct gpio_chip *chip)
-+{
-+	unsigned long	flags;
-+	int		status = 0;
-+	unsigned	id;
-+
-+	/* NOTE chip->base negative is reserved to mean a request for
-+	 * dynamic allocation.  We don't currently support that.
-+	 */
-+
-+	if (chip->base < 0 || (chip->base  + chip->ngpio) >= ARCH_NR_GPIOS) {
-+		status = -EINVAL;
-+		goto fail;
-+	}
-+
-+	spin_lock_irqsave(&gpio_lock, flags);
-+
-+	/* these GPIO numbers must not be managed by another gpio_chip */
-+	for (id = chip->base; id < chip->base + chip->ngpio; id++) {
-+		if (gpio_desc[id].chip != NULL) {
-+			status = -EBUSY;
-+			break;
-+		}
-+	}
-+	if (status == 0) {
-+		for (id = chip->base; id < chip->base + chip->ngpio; id++) {
-+			gpio_desc[id].chip = chip;
-+			gpio_desc[id].flags = 0;
-+		}
-+	}
-+
-+	spin_unlock_irqrestore(&gpio_lock, flags);
-+fail:
-+	/* failures here can mean systems won't boot... */
-+	if (status)
-+		pr_err("gpiochip_add: gpios %d..%d (%s) not registered\n",
-+			chip->base, chip->base + chip->ngpio,
-+			chip->label ? : "generic");
-+	return status;
-+}
-+EXPORT_SYMBOL_GPL(gpiochip_add);
-+
-+/**
-+ * gpiochip_remove() - unregister a gpio_chip
-+ * @chip: the chip to unregister
-+ *
-+ * A gpio_chip with any GPIOs still requested may not be removed.
-+ */
-+int gpiochip_remove(struct gpio_chip *chip)
-+{
-+	unsigned long	flags;
-+	int		status = 0;
-+	unsigned	id;
-+
-+	spin_lock_irqsave(&gpio_lock, flags);
-+
-+	for (id = chip->base; id < chip->base + chip->ngpio; id++) {
-+		if (test_bit(FLAG_REQUESTED, &gpio_desc[id].flags)) {
-+			status = -EBUSY;
-+			break;
-+		}
-+	}
-+	if (status == 0) {
-+		for (id = chip->base; id < chip->base + chip->ngpio; id++)
-+			gpio_desc[id].chip = NULL;
-+	}
-+
-+	spin_unlock_irqrestore(&gpio_lock, flags);
-+	return status;
-+}
-+EXPORT_SYMBOL_GPL(gpiochip_remove);
-+
-+
-+/* These "optional" allocation calls help prevent drivers from stomping
-+ * on each other, and help provide better diagnostics in debugfs.
-+ * They're called even less than the "set direction" calls.
-+ */
-+int gpio_request(unsigned gpio, const char *label)
-+{
-+	struct gpio_desc	*desc;
-+	int			status = -EINVAL;
-+	unsigned long		flags;
-+
-+	spin_lock_irqsave(&gpio_lock, flags);
-+
-+	if (gpio >= ARCH_NR_GPIOS)
-+		goto done;
-+	desc = &gpio_desc[gpio];
-+	if (desc->chip == NULL)
-+		goto done;
-+
-+	/* NOTE:  gpio_request() can be called in early boot,
-+	 * before IRQs are enabled.
-+	 */
-+
-+	if (test_and_set_bit(FLAG_REQUESTED, &desc->flags) == 0) {
-+		desc_set_label(desc, label ? : "?");
-+		status = 0;
-+	} else
-+		status = -EBUSY;
-+
-+done:
-+	if (status)
-+		pr_debug("gpio_request: gpio-%d (%s) status %d\n",
-+			gpio, label ? : "?", status);
-+	spin_unlock_irqrestore(&gpio_lock, flags);
-+	return status;
-+}
-+EXPORT_SYMBOL_GPL(gpio_request);
-+
-+void gpio_free(unsigned gpio)
-+{
-+	unsigned long		flags;
-+	struct gpio_desc	*desc;
-+
-+	if (gpio >= ARCH_NR_GPIOS) {
-+		WARN_ON(extra_checks);
-+		return;
-+	}
-+
-+	spin_lock_irqsave(&gpio_lock, flags);
-+
-+	desc = &gpio_desc[gpio];
-+	if (desc->chip && test_and_clear_bit(FLAG_REQUESTED, &desc->flags))
-+		desc_set_label(desc, NULL);
-+	else
-+		WARN_ON(extra_checks);
-+
-+	spin_unlock_irqrestore(&gpio_lock, flags);
-+}
-+EXPORT_SYMBOL_GPL(gpio_free);
-+
-+
-+/**
-+ * gpiochip_is_requested - return string iff signal was requested
-+ * @chip: controller managing the signal
-+ * @offset: of signal within controller's 0..(ngpio - 1) range
-+ *
-+ * Returns NULL if the GPIO is not currently requested, else a string.
-+ * If debugfs support is enabled, the string returned is the label passed
-+ * to gpio_request(); otherwise it is a meaningless constant.
-+ *
-+ * This function is for use by GPIO controller drivers.  The label can
-+ * help with diagnostics, and knowing that the signal is used as a GPIO
-+ * can help avoid accidentally multiplexing it to another controller.
-+ */
-+const char *gpiochip_is_requested(struct gpio_chip *chip, unsigned offset)
-+{
-+	unsigned gpio = chip->base + offset;
-+
-+	if (gpio >= ARCH_NR_GPIOS || gpio_desc[gpio].chip != chip)
-+		return NULL;
-+	if (test_bit(FLAG_REQUESTED, &gpio_desc[gpio].flags) == 0)
-+		return NULL;
-+#ifdef CONFIG_DEBUG_FS
-+	return gpio_desc[gpio].label;
-+#else
-+	return "?";
-+#endif
-+}
-+EXPORT_SYMBOL_GPL(gpiochip_is_requested);
-+
-+
-+/* Drivers MUST set GPIO direction before making get/set calls.  In
-+ * some cases this is done in early boot, before IRQs are enabled.
-+ *
-+ * As a rule these aren't called more than once (except for drivers
-+ * using the open-drain emulation idiom) so these are natural places
-+ * to accumulate extra debugging checks.  Note that we can't (yet)
-+ * rely on gpio_request() having been called beforehand.
-+ */
-+
-+int gpio_direction_input(unsigned gpio)
-+{
-+	unsigned long		flags;
-+	struct gpio_chip	*chip;
-+	struct gpio_desc	*desc = &gpio_desc[gpio];
-+	int			status = -EINVAL;
-+
-+	spin_lock_irqsave(&gpio_lock, flags);
-+
-+	if (gpio >= ARCH_NR_GPIOS)
-+		goto fail;
-+	chip = desc->chip;
-+	if (!chip || !chip->get || !chip->direction_input)
-+		goto fail;
-+	gpio -= chip->base;
-+	if (gpio >= chip->ngpio)
-+		goto fail;
-+	gpio_ensure_requested(desc);
-+
-+	/* now we know the gpio is valid and chip won't vanish */
-+
-+	spin_unlock_irqrestore(&gpio_lock, flags);
-+
-+	might_sleep_if(extra_checks && chip->can_sleep);
-+
-+	status = chip->direction_input(chip, gpio);
-+	if (status == 0)
-+		clear_bit(FLAG_IS_OUT, &desc->flags);
-+	return status;
-+fail:
-+	spin_unlock_irqrestore(&gpio_lock, flags);
-+	if (status)
-+		pr_debug("%s: gpio-%d status %d\n",
-+			__FUNCTION__, gpio, status);
-+	return status;
-+}
-+EXPORT_SYMBOL_GPL(gpio_direction_input);
-+
-+int gpio_direction_output(unsigned gpio, int value)
-+{
-+	unsigned long		flags;
-+	struct gpio_chip	*chip;
-+	struct gpio_desc	*desc = &gpio_desc[gpio];
-+	int			status = -EINVAL;
-+
-+	spin_lock_irqsave(&gpio_lock, flags);
-+
-+	if (gpio >= ARCH_NR_GPIOS)
-+		goto fail;
-+	chip = desc->chip;
-+	if (!chip || !chip->set || !chip->direction_output)
-+		goto fail;
-+	gpio -= chip->base;
-+	if (gpio >= chip->ngpio)
-+		goto fail;
-+	gpio_ensure_requested(desc);
-+
-+	/* now we know the gpio is valid and chip won't vanish */
-+
-+	spin_unlock_irqrestore(&gpio_lock, flags);
-+
-+	might_sleep_if(extra_checks && chip->can_sleep);
-+
-+	status = chip->direction_output(chip, gpio, value);
-+	if (status == 0)
-+		set_bit(FLAG_IS_OUT, &desc->flags);
-+	return status;
-+fail:
-+	spin_unlock_irqrestore(&gpio_lock, flags);
-+	if (status)
-+		pr_debug("%s: gpio-%d status %d\n",
-+			__FUNCTION__, gpio, status);
-+	return status;
-+}
-+EXPORT_SYMBOL_GPL(gpio_direction_output);
-+
-+
-+/* I/O calls are only valid after configuration completed; the relevant
-+ * "is this a valid GPIO" error checks should already have been done.
-+ *
-+ * "Get" operations are often inlinable as reading a pin value register,
-+ * and masking the relevant bit in that register.
-+ *
-+ * When "set" operations are inlinable, they involve writing that mask to
-+ * one register to set a low value, or a different register to set it high.
-+ * Otherwise locking is needed, so there may be little value to inlining.
-+ *
-+ *------------------------------------------------------------------------
-+ *
-+ * IMPORTANT!!!  The hot paths -- get/set value -- assume that callers
-+ * have requested the GPIO.  That can include implicit requesting by
-+ * a direction setting call.  Marking a gpio as requested locks its chip
-+ * in memory, guaranteeing that these table lookups need no more locking
-+ * and that gpiochip_remove() will fail.
-+ *
-+ * REVISIT when debugging, consider adding some instrumentation to ensure
-+ * that the GPIO was actually requested.
-+ */
-+
-+/**
-+ * __gpio_get_value() - return a gpio's value
-+ * @gpio: gpio whose value will be returned
-+ * Context: any
-+ *
-+ * This is used directly or indirectly to implement gpio_get_value().
-+ * It returns the zero or nonzero value provided by the associated
-+ * gpio_chip.get() method; or zero if no such method is provided.
-+ */
-+int __gpio_get_value(unsigned gpio)
-+{
-+	struct gpio_chip	*chip;
-+
-+	chip = gpio_to_chip(gpio);
-+	WARN_ON(extra_checks && chip->can_sleep);
-+	return chip->get ? chip->get(chip, gpio - chip->base) : 0;
-+}
-+EXPORT_SYMBOL_GPL(__gpio_get_value);
-+
-+/**
-+ * __gpio_set_value() - assign a gpio's value
-+ * @gpio: gpio whose value will be assigned
-+ * @value: value to assign
-+ * Context: any
-+ *
-+ * This is used directly or indirectly to implement gpio_set_value().
-+ * It invokes the associated gpio_chip.set() method.
-+ */
-+void __gpio_set_value(unsigned gpio, int value)
-+{
-+	struct gpio_chip	*chip;
-+
-+	chip = gpio_to_chip(gpio);
-+	WARN_ON(extra_checks && chip->can_sleep);
-+	chip->set(chip, gpio - chip->base, value);
-+}
-+EXPORT_SYMBOL_GPL(__gpio_set_value);
-+
-+/**
-+ * __gpio_cansleep() - report whether gpio value access will sleep
-+ * @gpio: gpio in question
-+ * Context: any
-+ *
-+ * This is used directly or indirectly to implement gpio_cansleep().  It
-+ * returns nonzero if access reading or writing the GPIO value can sleep.
-+ */
-+int __gpio_cansleep(unsigned gpio)
-+{
-+	struct gpio_chip	*chip;
-+
-+	/* only call this on GPIOs that are valid! */
-+	chip = gpio_to_chip(gpio);
-+
-+	return chip->can_sleep;
-+}
-+EXPORT_SYMBOL_GPL(__gpio_cansleep);
-+
-+
-+
-+/* There's no value in making it easy to inline GPIO calls that may sleep.
-+ * Common examples include ones connected to I2C or SPI chips.
-+ */
-+
-+int gpio_get_value_cansleep(unsigned gpio)
-+{
-+	struct gpio_chip	*chip;
-+
-+	might_sleep_if(extra_checks);
-+	chip = gpio_to_chip(gpio);
-+	return chip->get(chip, gpio - chip->base);
-+}
-+EXPORT_SYMBOL_GPL(gpio_get_value_cansleep);
-+
-+void gpio_set_value_cansleep(unsigned gpio, int value)
-+{
-+	struct gpio_chip	*chip;
-+
-+	might_sleep_if(extra_checks);
-+	chip = gpio_to_chip(gpio);
-+	chip->set(chip, gpio - chip->base, value);
-+}
-+EXPORT_SYMBOL_GPL(gpio_set_value_cansleep);
-+
-+
-+#ifdef CONFIG_DEBUG_FS
-+
-+#include <linux/debugfs.h>
-+#include <linux/seq_file.h>
-+
-+
-+static void gpiolib_dbg_show(struct seq_file *s, struct gpio_chip *chip)
-+{
-+	unsigned		i;
-+	unsigned		gpio = chip->base;
-+	struct gpio_desc	*gdesc = &gpio_desc[gpio];
-+	int			is_out;
-+
-+	for (i = 0; i < chip->ngpio; i++, gpio++, gdesc++) {
-+		if (!test_bit(FLAG_REQUESTED, &gdesc->flags))
-+			continue;
-+
-+		is_out = test_bit(FLAG_IS_OUT, &gdesc->flags);
-+		seq_printf(s, " gpio-%-3d (%-12s) %s %s",
-+			gpio, gdesc->label,
-+			is_out ? "out" : "in ",
-+			chip->get
-+				? (chip->get(chip, i) ? "hi" : "lo")
-+				: "?  ");
-+
-+		if (!is_out) {
-+			int		irq = gpio_to_irq(gpio);
-+			struct irq_desc	*desc = irq_desc + irq;
-+
-+			/* This races with request_irq(), set_irq_type(),
-+			 * and set_irq_wake() ... but those are "rare".
-+			 *
-+			 * More significantly, trigger type flags aren't
-+			 * currently maintained by genirq.
-+			 */
-+			if (irq >= 0 && desc->action) {
-+				char *trigger;
-+
-+				switch (desc->status & IRQ_TYPE_SENSE_MASK) {
-+				case IRQ_TYPE_NONE:
-+					trigger = "(default)";
-+					break;
-+				case IRQ_TYPE_EDGE_FALLING:
-+					trigger = "edge-falling";
-+					break;
-+				case IRQ_TYPE_EDGE_RISING:
-+					trigger = "edge-rising";
-+					break;
-+				case IRQ_TYPE_EDGE_BOTH:
-+					trigger = "edge-both";
-+					break;
-+				case IRQ_TYPE_LEVEL_HIGH:
-+					trigger = "level-high";
-+					break;
-+				case IRQ_TYPE_LEVEL_LOW:
-+					trigger = "level-low";
-+					break;
-+				default:
-+					trigger = "?trigger?";
-+					break;
-+				}
-+
-+				seq_printf(s, " irq-%d %s%s",
-+					irq, trigger,
-+					(desc->status & IRQ_WAKEUP)
-+						? " wakeup" : "");
-+			}
-+		}
-+
-+		seq_printf(s, "\n");
-+	}
-+}
-+
-+static int gpiolib_show(struct seq_file *s, void *unused)
-+{
-+	struct gpio_chip	*chip = NULL;
-+	unsigned		gpio;
-+	int			started = 0;
-+
-+	/* REVISIT this isn't locked against gpio_chip removal ... */
-+
-+	for (gpio = 0; gpio < ARCH_NR_GPIOS; gpio++) {
-+		if (chip == gpio_desc[gpio].chip)
-+			continue;
-+		chip = gpio_desc[gpio].chip;
-+		if (!chip)
-+			continue;
-+
-+		seq_printf(s, "%sGPIOs %d-%d, %s%s:\n",
-+				started ? "\n" : "",
-+				chip->base, chip->base + chip->ngpio - 1,
-+				chip->label ? : "generic",
-+				chip->can_sleep ? ", can sleep" : "");
-+		started = 1;
-+		if (chip->dbg_show)
-+			chip->dbg_show(s, chip);
-+		else
-+			gpiolib_dbg_show(s, chip);
-+	}
-+	return 0;
-+}
-+
-+static int gpiolib_open(struct inode *inode, struct file *file)
-+{
-+	return single_open(file, gpiolib_show, NULL);
-+}
-+
-+static struct file_operations gpiolib_operations = {
-+	.open		= gpiolib_open,
-+	.read		= seq_read,
-+	.llseek		= seq_lseek,
-+	.release	= single_release,
-+};
-+
-+static int __init gpiolib_debugfs_init(void)
-+{
-+	/* /sys/kernel/debug/gpio */
-+	(void) debugfs_create_file("gpio", S_IFREG | S_IRUGO,
-+				NULL, NULL, &gpiolib_operations);
-+	return 0;
-+}
-+subsys_initcall(gpiolib_debugfs_init);
-+
-+#endif	/* DEBUG_FS */
-diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h
-index 2d0aab1..f29a502 100644
---- a/include/asm-generic/gpio.h
-+++ b/include/asm-generic/gpio.h
-@@ -1,6 +1,102 @@
- #ifndef _ASM_GENERIC_GPIO_H
- #define _ASM_GENERIC_GPIO_H
- 
-+#ifdef CONFIG_HAVE_GPIO_LIB
-+
-+/* Platforms may implement their GPIO interface with library code,
-+ * at a small performance cost for non-inlined operations and some
-+ * extra memory (for code and for per-GPIO table entries).
-+ *
-+ * While the GPIO programming interface defines valid GPIO numbers
-+ * to be in the range 0..MAX_INT, this library restricts them to the
-+ * smaller range 0..ARCH_NR_GPIOS.
-+ */
-+
-+#ifndef ARCH_NR_GPIOS
-+#define ARCH_NR_GPIOS		256
-+#endif
-+
-+struct seq_file;
-+
-+/**
-+ * struct gpio_chip - abstract a GPIO controller
-+ * @label: for diagnostics
-+ * @direction_input: configures signal "offset" as input, or returns error
-+ * @get: returns value for signal "offset"; for output signals this
-+ *	returns either the value actually sensed, or zero
-+ * @direction_output: configures signal "offset" as output, or returns error
-+ * @set: assigns output value for signal "offset"
-+ * @dbg_show: optional routine to show contents in debugfs; default code
-+ *	will be used when this is omitted, but custom code can show extra
-+ *	state (such as pullup/pulldown configuration).
-+ * @base: identifies the first GPIO number handled by this chip; or, if
-+ *	negative during registration, requests dynamic ID allocation.
-+ * @ngpio: the number of GPIOs handled by this controller; the last GPIO
-+ *	handled is (base + ngpio - 1).
-+ * @can_sleep: flag must be set iff get()/set() methods sleep, as they
-+ *	must while accessing GPIO expander chips over I2C or SPI
-+ *
-+ * A gpio_chip can help platforms abstract various sources of GPIOs so
-+ * they can all be accessed through a common programing interface.
-+ * Example sources would be SOC controllers, FPGAs, multifunction
-+ * chips, dedicated GPIO expanders, and so on.
-+ *
-+ * Each chip controls a number of signals, identified in method calls
-+ * by "offset" values in the range 0..(@ngpio - 1).  When those signals
-+ * are referenced through calls like gpio_get_value(gpio), the offset
-+ * is calculated by subtracting @base from the gpio number.
-+ */
-+struct gpio_chip {
-+	char			*label;
-+
-+	int			(*direction_input)(struct gpio_chip *chip,
-+						unsigned offset);
-+	int			(*get)(struct gpio_chip *chip,
-+						unsigned offset);
-+	int			(*direction_output)(struct gpio_chip *chip,
-+						unsigned offset, int value);
-+	void			(*set)(struct gpio_chip *chip,
-+						unsigned offset, int value);
-+	void			(*dbg_show)(struct seq_file *s,
-+						struct gpio_chip *chip);
-+	int			base;
-+	u16			ngpio;
-+	unsigned		can_sleep:1;
-+};
-+
-+extern const char *gpiochip_is_requested(struct gpio_chip *chip,
-+			unsigned offset);
-+
-+/* add/remove chips */
-+extern int gpiochip_add(struct gpio_chip *chip);
-+extern int __must_check gpiochip_remove(struct gpio_chip *chip);
-+
-+
-+/* Always use the library code for GPIO management calls,
-+ * or when sleeping may be involved.
-+ */
-+extern int gpio_request(unsigned gpio, const char *label);
-+extern void gpio_free(unsigned gpio);
-+
-+extern int gpio_direction_input(unsigned gpio);
-+extern int gpio_direction_output(unsigned gpio, int value);
-+
-+extern int gpio_get_value_cansleep(unsigned gpio);
-+extern void gpio_set_value_cansleep(unsigned gpio, int value);
-+
-+
-+/* A platform's <asm/gpio.h> code may want to inline the I/O calls when
-+ * the GPIO is constant and refers to some always-present controller,
-+ * giving direct access to chip registers and tight bitbanging loops.
-+ */
-+extern int __gpio_get_value(unsigned gpio);
-+extern void __gpio_set_value(unsigned gpio, int value);
-+
-+extern int __gpio_cansleep(unsigned gpio);
-+
-+
-+#else
-+
- /* platforms that don't directly support access to GPIOs through I2C, SPI,
-  * or other blocking infrastructure can use these wrappers.
-  */
-@@ -22,4 +118,6 @@ static inline void gpio_set_value_cansleep(unsigned gpio, int value)
- 	gpio_set_value(gpio, value);
- }
- 
-+#endif
-+
- #endif /* _ASM_GENERIC_GPIO_H */
--- 
-1.5.3.8
-