Merge branch 'gpio/next' of git://git.secretlab.ca/git/linux-2.6

* 'gpio/next' of git://git.secretlab.ca/git/linux-2.6:
  gpio/via: rename VIA local config struct
  basic_mmio_gpio: split into a gpio library and platform device
  gpio: remove some legacy comments in build files
  gpio: add trace events for setting direction and value
  gpio/pca953x: Use handle_simple_irq instead of handle_edge_irq
  gpiolib: export gpiochip_find
  gpio: remove redundant Kconfig depends on GPIOLIB
  basic_mmio_gpio: convert to non-__raw* accessors
  basic_mmio_gpio: support direction registers
  basic_mmio_gpio: support different input/output registers
  basic_mmio_gpio: detect output method at probe time
  basic_mmio_gpio: request register regions
  basic_mmio_gpio: allow overriding number of gpio
  basic_mmio_gpio: convert to platform_{get,set}_drvdata()
  basic_mmio_gpio: remove runtime width/endianness evaluation

drivers/gpio/Kconfig

 #
-# platform-neutral GPIO infrastructure and expanders
+# GPIO infrastructure and drivers
 #
 
 config ARCH_WANT_OPTIONAL_GPIOLIB
@@ -31,7 +31,7 @@ menuconfig GPIOLIB
 	help
 	  This enables GPIO support through the generic GPIO library.
 	  You only need to enable this, if you also want to enable
-	  one or more of the GPIO expansion card drivers below.
+	  one or more of the GPIO drivers below.
 
 	  If unsure, say N.
 
@@ -63,21 +63,26 @@ config GPIO_SYSFS
 	  Kernel drivers may also request that a particular GPIO be
 	  exported to userspace; this can be useful when debugging.
 
-# put expanders in the right section, in alphabetical order
+# put drivers in the right section, in alphabetical order
 
 config GPIO_MAX730X
 	tristate
 
-comment "Memory mapped GPIO expanders:"
+comment "Memory mapped GPIO drivers:"
+
+config GPIO_BASIC_MMIO_CORE
+	tristate
+	help
+	  Provides core functionality for basic memory-mapped GPIO controllers.
 
 config GPIO_BASIC_MMIO
 	tristate "Basic memory-mapped GPIO controllers support"
+	select GPIO_BASIC_MMIO_CORE
 	help
 	  Say yes here to support basic memory-mapped GPIO controllers.
 
 config GPIO_IT8761E
 	tristate "IT8761E GPIO support"
-	depends on GPIOLIB
 	help
 	  Say yes here to support GPIO functionality of IT8761E super I/O chip.
 
@@ -101,7 +106,7 @@ config GPIO_VR41XX
 
 config GPIO_SCH
 	tristate "Intel SCH/TunnelCreek GPIO"
-	depends on GPIOLIB && PCI && X86
+	depends on PCI && X86
 	select MFD_CORE
 	select LPC_SCH
 	help
@@ -121,7 +126,7 @@ config GPIO_SCH
 
 config GPIO_VX855
 	tristate "VIA VX855/VX875 GPIO"
-	depends on GPIOLIB && MFD_SUPPORT && PCI
+	depends on MFD_SUPPORT && PCI
 	select MFD_CORE
 	select MFD_VX855
 	help
@@ -347,13 +352,13 @@ config GPIO_ML_IOH
 
 config GPIO_TIMBERDALE
 	bool "Support for timberdale GPIO IP"
-	depends on MFD_TIMBERDALE && GPIOLIB && HAS_IOMEM
+	depends on MFD_TIMBERDALE && HAS_IOMEM
 	---help---
 	Add support for the GPIO IP in the timberdale FPGA.
 
 config GPIO_RDC321X
 	tristate "RDC R-321x GPIO support"
-	depends on PCI && GPIOLIB
+	depends on PCI
 	select MFD_SUPPORT
 	select MFD_CORE
 	select MFD_RDC321X

drivers/gpio/Makefile

-# generic gpio support: dedicated expander chips, etc
-#
-# NOTE: platform-specific GPIO drivers don't belong in the
-# drivers/gpio directory; put them with other platform setup
-# code, IRQ controllers, board init, etc.
+# generic gpio support: platform drivers, dedicated expander chips, etc
 
 ccflags-$(CONFIG_DEBUG_GPIO)	+= -DDEBUG
 
@@ -10,6 +6,7 @@ obj-$(CONFIG_GPIOLIB)		+= gpiolib.o
 
 obj-$(CONFIG_GPIO_ADP5520)	+= adp5520-gpio.o
 obj-$(CONFIG_GPIO_ADP5588)	+= adp5588-gpio.o
+obj-$(CONFIG_GPIO_BASIC_MMIO_CORE)	+= basic_mmio_gpio.o
 obj-$(CONFIG_GPIO_BASIC_MMIO)	+= basic_mmio_gpio.o
 obj-$(CONFIG_GPIO_LANGWELL)	+= langwell_gpio.o
 obj-$(CONFIG_GPIO_MAX730X)	+= max730x.o

drivers/gpio/gpiolib.c

@@ -12,6 +12,8 @@
 #include <linux/idr.h>
 #include <linux/slab.h>
 
+#define CREATE_TRACE_POINTS
+#include <trace/events/gpio.h>
 
 /* Optional implementation infrastructure for GPIO interfaces.
  *
@@ -1165,6 +1167,7 @@ struct gpio_chip *gpiochip_find(void *data,
 
 	return chip;
 }
+EXPORT_SYMBOL_GPL(gpiochip_find);
 
 /* These "optional" allocation calls help prevent drivers from stomping
  * on each other, and help provide better diagnostics in debugfs.
@@ -1404,6 +1407,8 @@ int gpio_direction_input(unsigned gpio)
 	status = chip->direction_input(chip, gpio);
 	if (status == 0)
 		clear_bit(FLAG_IS_OUT, &desc->flags);
+
+	trace_gpio_direction(chip->base + gpio, 1, status);
 lose:
 	return status;
 fail:
@@ -1457,6 +1462,8 @@ int gpio_direction_output(unsigned gpio, int value)
 	status = chip->direction_output(chip, gpio, value);
 	if (status == 0)
 		set_bit(FLAG_IS_OUT, &desc->flags);
+	trace_gpio_value(chip->base + gpio, 0, value);
+	trace_gpio_direction(chip->base + gpio, 0, status);
 lose:
 	return status;
 fail:
@@ -1546,10 +1553,13 @@ EXPORT_SYMBOL_GPL(gpio_set_debounce);
 int __gpio_get_value(unsigned gpio)
 {
 	struct gpio_chip	*chip;
+	int value;
 
 	chip = gpio_to_chip(gpio);
 	WARN_ON(chip->can_sleep);
-	return chip->get ? chip->get(chip, gpio - chip->base) : 0;
+	value = chip->get ? chip->get(chip, gpio - chip->base) : 0;
+	trace_gpio_value(gpio, 1, value);
+	return value;
 }
 EXPORT_SYMBOL_GPL(__gpio_get_value);
 
@@ -1568,6 +1578,7 @@ void __gpio_set_value(unsigned gpio, int value)
 
 	chip = gpio_to_chip(gpio);
 	WARN_ON(chip->can_sleep);
+	trace_gpio_value(gpio, 0, value);
 	chip->set(chip, gpio - chip->base, value);
 }
 EXPORT_SYMBOL_GPL(__gpio_set_value);
@@ -1618,10 +1629,13 @@ EXPORT_SYMBOL_GPL(__gpio_to_irq);
 int gpio_get_value_cansleep(unsigned gpio)
 {
 	struct gpio_chip	*chip;
+	int value;
 
 	might_sleep_if(extra_checks);
 	chip = gpio_to_chip(gpio);
-	return chip->get ? chip->get(chip, gpio - chip->base) : 0;
+	value = chip->get ? chip->get(chip, gpio - chip->base) : 0;
+	trace_gpio_value(gpio, 1, value);
+	return value;
 }
 EXPORT_SYMBOL_GPL(gpio_get_value_cansleep);
 
@@ -1631,6 +1645,7 @@ void gpio_set_value_cansleep(unsigned gpio, int value)
 
 	might_sleep_if(extra_checks);
 	chip = gpio_to_chip(gpio);
+	trace_gpio_value(gpio, 0, value);
 	chip->set(chip, gpio - chip->base, value);
 }
 EXPORT_SYMBOL_GPL(gpio_set_value_cansleep);

drivers/gpio/pca953x.c

@@ -397,7 +397,7 @@ static int pca953x_irq_setup(struct pca953x_chip *chip,
 
 			irq_set_chip_data(irq, chip);
 			irq_set_chip_and_handler(irq, &pca953x_irq_chip,
-						 handle_edge_irq);
+						 handle_simple_irq);
 #ifdef CONFIG_ARM
 			set_irq_flags(irq, IRQF_VALID);
 #else

drivers/video/via/via-gpio.c

@@ -145,7 +145,7 @@ static int via_gpio_get(struct gpio_chip *chip, unsigned int nr)
 }
 
 
-static struct viafb_gpio_cfg gpio_config = {
+static struct viafb_gpio_cfg viafb_gpio_config = {
 	.gpio_chip = {
 		.label = "VIAFB onboard GPIO",
 		.owner = THIS_MODULE,
@@ -183,8 +183,8 @@ static int viafb_gpio_resume(void *private)
 {
 	int i;
 
-	for (i = 0; i < gpio_config.gpio_chip.ngpio; i += 2)
-		viafb_gpio_enable(gpio_config.active_gpios[i]);
+	for (i = 0; i < viafb_gpio_config.gpio_chip.ngpio; i += 2)
+		viafb_gpio_enable(viafb_gpio_config.active_gpios[i]);
 	return 0;
 }
 
@@ -201,9 +201,9 @@ int viafb_gpio_lookup(const char *name)
 {
 	int i;
 
-	for (i = 0; i < gpio_config.gpio_chip.ngpio; i++)
-		if (!strcmp(name, gpio_config.active_gpios[i]->vg_name))
-			return gpio_config.gpio_chip.base + i;
+	for (i = 0; i < viafb_gpio_config.gpio_chip.ngpio; i++)
+		if (!strcmp(name, viafb_gpio_config.active_gpios[i]->vg_name))
+			return viafb_gpio_config.gpio_chip.base + i;
 	return -1;
 }
 EXPORT_SYMBOL_GPL(viafb_gpio_lookup);
@@ -229,14 +229,15 @@ static __devinit int viafb_gpio_probe(struct platform_device *platdev)
 		for (gpio = viafb_all_gpios;
 		     gpio < viafb_all_gpios + VIAFB_NUM_GPIOS; gpio++)
 			if (gpio->vg_port_index == port_cfg[i].ioport_index) {
-				gpio_config.active_gpios[ngpio] = gpio;
-				gpio_config.gpio_names[ngpio] = gpio->vg_name;
+				viafb_gpio_config.active_gpios[ngpio] = gpio;
+				viafb_gpio_config.gpio_names[ngpio] =
+					gpio->vg_name;
 				ngpio++;
 			}
 	}
-	gpio_config.gpio_chip.ngpio = ngpio;
-	gpio_config.gpio_chip.names = gpio_config.gpio_names;
-	gpio_config.vdev = vdev;
+	viafb_gpio_config.gpio_chip.ngpio = ngpio;
+	viafb_gpio_config.gpio_chip.names = viafb_gpio_config.gpio_names;
+	viafb_gpio_config.vdev = vdev;
 	if (ngpio == 0) {
 		printk(KERN_INFO "viafb: no GPIOs configured\n");
 		return 0;
@@ -245,18 +246,18 @@ static __devinit int viafb_gpio_probe(struct platform_device *platdev)
 	 * Enable the ports.  They come in pairs, with a single
 	 * enable bit for both.
 	 */
-	spin_lock_irqsave(&gpio_config.vdev->reg_lock, flags);
+	spin_lock_irqsave(&viafb_gpio_config.vdev->reg_lock, flags);
 	for (i = 0; i < ngpio; i += 2)
-		viafb_gpio_enable(gpio_config.active_gpios[i]);
-	spin_unlock_irqrestore(&gpio_config.vdev->reg_lock, flags);
+		viafb_gpio_enable(viafb_gpio_config.active_gpios[i]);
+	spin_unlock_irqrestore(&viafb_gpio_config.vdev->reg_lock, flags);
 	/*
 	 * Get registered.
 	 */
-	gpio_config.gpio_chip.base = -1;  /* Dynamic */
-	ret = gpiochip_add(&gpio_config.gpio_chip);
+	viafb_gpio_config.gpio_chip.base = -1;  /* Dynamic */
+	ret = gpiochip_add(&viafb_gpio_config.gpio_chip);
 	if (ret) {
 		printk(KERN_ERR "viafb: failed to add gpios (%d)\n", ret);
-		gpio_config.gpio_chip.ngpio = 0;
+		viafb_gpio_config.gpio_chip.ngpio = 0;
 	}
 #ifdef CONFIG_PM
 	viafb_pm_register(&viafb_gpio_pm_hooks);
@@ -277,8 +278,8 @@ static int viafb_gpio_remove(struct platform_device *platdev)
 	/*
 	 * Get unregistered.
 	 */
-	if (gpio_config.gpio_chip.ngpio > 0) {
-		ret = gpiochip_remove(&gpio_config.gpio_chip);
+	if (viafb_gpio_config.gpio_chip.ngpio > 0) {
+		ret = gpiochip_remove(&viafb_gpio_config.gpio_chip);
 		if (ret) { /* Somebody still using it? */
 			printk(KERN_ERR "Viafb: GPIO remove failed\n");
 			return ret;
@@ -287,11 +288,11 @@ static int viafb_gpio_remove(struct platform_device *platdev)
 	/*
 	 * Disable the ports.
 	 */
-	spin_lock_irqsave(&gpio_config.vdev->reg_lock, flags);
-	for (i = 0; i < gpio_config.gpio_chip.ngpio; i += 2)
-		viafb_gpio_disable(gpio_config.active_gpios[i]);
-	gpio_config.gpio_chip.ngpio = 0;
-	spin_unlock_irqrestore(&gpio_config.vdev->reg_lock, flags);
+	spin_lock_irqsave(&viafb_gpio_config.vdev->reg_lock, flags);
+	for (i = 0; i < viafb_gpio_config.gpio_chip.ngpio; i += 2)
+		viafb_gpio_disable(viafb_gpio_config.active_gpios[i]);
+	viafb_gpio_config.gpio_chip.ngpio = 0;
+	spin_unlock_irqrestore(&viafb_gpio_config.vdev->reg_lock, flags);
 	return ret;
 }
 

include/linux/basic_mmio_gpio.h

@@ -13,8 +13,64 @@
 #ifndef __BASIC_MMIO_GPIO_H
 #define __BASIC_MMIO_GPIO_H
 
+#include <linux/gpio.h>
+#include <linux/types.h>
+#include <linux/compiler.h>
+
 struct bgpio_pdata {
 	int base;
+	int ngpio;
 };
 
+struct device;
+
+struct bgpio_chip {
+	struct gpio_chip gc;
+
+	unsigned long (*read_reg)(void __iomem *reg);
+	void (*write_reg)(void __iomem *reg, unsigned long data);
+
+	void __iomem *reg_dat;
+	void __iomem *reg_set;
+	void __iomem *reg_clr;
+	void __iomem *reg_dir;
+
+	/* Number of bits (GPIOs): <register width> * 8. */
+	int bits;
+
+	/*
+	 * Some GPIO controllers work with the big-endian bits notation,
+	 * e.g. in a 8-bits register, GPIO7 is the least significant bit.
+	 */
+	unsigned long (*pin2mask)(struct bgpio_chip *bgc, unsigned int pin);
+
+	/*
+	 * Used to lock bgpio_chip->data. Also, this is needed to keep
+	 * shadowed and real data registers writes together.
+	 */
+	spinlock_t lock;
+
+	/* Shadowed data register to clear/set bits safely. */
+	unsigned long data;
+
+	/* Shadowed direction registers to clear/set direction safely. */
+	unsigned long dir;
+};
+
+static inline struct bgpio_chip *to_bgpio_chip(struct gpio_chip *gc)
+{
+	return container_of(gc, struct bgpio_chip, gc);
+}
+
+int __devexit bgpio_remove(struct bgpio_chip *bgc);
+int __devinit bgpio_init(struct bgpio_chip *bgc,
+			 struct device *dev,
+			 unsigned long sz,
+			 void __iomem *dat,
+			 void __iomem *set,
+			 void __iomem *clr,
+			 void __iomem *dirout,
+			 void __iomem *dirin,
+			 bool big_endian);
+
 #endif /* __BASIC_MMIO_GPIO_H */

include/trace/events/gpio.h

+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM gpio
+
+#if !defined(_TRACE_GPIO_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_GPIO_H
+
+#include <linux/tracepoint.h>
+
+TRACE_EVENT(gpio_direction,
+
+	TP_PROTO(unsigned gpio, int in, int err),
+
+	TP_ARGS(gpio, in, err),
+
+	TP_STRUCT__entry(
+		__field(unsigned, gpio)
+		__field(int, in)
+		__field(int, err)
+	),
+
+	TP_fast_assign(
+		__entry->gpio = gpio;
+		__entry->in = in;
+		__entry->err = err;
+	),
+
+	TP_printk("%u %3s (%d)", __entry->gpio,
+		__entry->in ? "in" : "out", __entry->err)
+);
+
+TRACE_EVENT(gpio_value,
+
+	TP_PROTO(unsigned gpio, int get, int value),
+
+	TP_ARGS(gpio, get, value),
+
+	TP_STRUCT__entry(
+		__field(unsigned, gpio)
+		__field(int, get)
+		__field(int, value)
+	),
+
+	TP_fast_assign(
+		__entry->gpio = gpio;
+		__entry->get = get;
+		__entry->value = value;
+	),
+
+	TP_printk("%u %3s %d", __entry->gpio,
+		__entry->get ? "get" : "set", __entry->value)
+);
+
+#endif /* if !defined(_TRACE_GPIO_H) || defined(TRACE_HEADER_MULTI_READ) */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>