openwrt-xburst/target/linux/atheros/patches-2.6.37/300-sysfs_for_gpio.patch

--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -111,7 +111,7 @@ config ATHEROS_AR231X
 	select SYS_HAS_CPU_MIPS32_R1
 	select SYS_SUPPORTS_BIG_ENDIAN
 	select SYS_SUPPORTS_32BIT_KERNEL
-	select GENERIC_GPIO
+	select ARCH_REQUIRE_GPIOLIB
 	select SYS_HAS_EARLY_PRINTK
 	help
 	  Support for AR231x and AR531x based boards
--- a/arch/mips/ar231x/Kconfig
+++ b/arch/mips/ar231x/Kconfig
@@ -13,7 +13,6 @@ config ATHEROS_AR2315
 	select SYS_HAS_CPU_MIPS32_R1
 	select SYS_SUPPORTS_32BIT_KERNEL
 	select SYS_SUPPORTS_BIG_ENDIAN
-	select GENERIC_GPIO
 	default y
 
 config ATHEROS_AR2315_PCI
--- a/arch/mips/ar231x/ar2315.c
+++ b/arch/mips/ar231x/ar2315.c
@@ -23,12 +23,12 @@
 #include <linux/reboot.h>
 #include <linux/delay.h>
 #include <linux/leds.h>
+#include <linux/gpio.h>
 #include <asm/bootinfo.h>
 #include <asm/reboot.h>
 #include <asm/time.h>
 #include <asm/irq.h>
 #include <asm/io.h>
-#include <asm/gpio.h>
 
 #include <ar231x_platform.h>
 #include <ar2315_regs.h>
@@ -312,17 +312,6 @@ ar2315_irq_init(void)
 	setup_irq(AR2315_IRQ_MISC_INTRS, &cascade);
 }
 
-const struct ar231x_gpiodev ar2315_gpiodev;
-
-static u32
-ar2315_gpio_get_output(void)
-{
-	u32 reg;
-	reg = ar231x_read_reg(AR2315_GPIO_CR);
-	reg &= ar2315_gpiodev.valid_mask;
-	return reg;
-}
-
 static u32
 ar2315_gpio_set_output(u32 mask, u32 val)
 {
@@ -336,11 +325,11 @@ ar2315_gpio_set_output(u32 mask, u32 val
 }
 
 static u32
-ar2315_gpio_get(void)
+ar2315_gpio_get(u32 valid_mask)
 {
 	u32 reg;
 	reg = ar231x_read_reg(AR2315_GPIO_DI);
-	reg &= ar2315_gpiodev.valid_mask;
+	reg &= valid_mask;
 	return reg;
 }
 
@@ -355,14 +344,75 @@ ar2315_gpio_set(u32 mask, u32 value)
 	return reg;
 }
 
-const struct ar231x_gpiodev ar2315_gpiodev = {
+/*
+ * gpiolib implementation.  Original legacy mask based methods
+ * preserved for now.
+ */
+static int
+ar2315_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
+{
+	struct ar231x_gpio_chip *gpch =
+		container_of(chip, struct ar231x_gpio_chip, chip);
+	u32 mask = 1 << gpio;
+	u32 rett;
+	if (!(gpch->valid_mask & mask))
+		return 0;
+	rett = ar2315_gpio_get(gpch->valid_mask);  // legacy code
+	return !!(rett & mask);
+}
+
+static void
+ar2315_gpio_set_value(struct gpio_chip *chip, unsigned gpio, int value)
+{
+	struct ar231x_gpio_chip *gpch =
+		container_of(chip, struct ar231x_gpio_chip, chip);
+	u32 mask = 1 << gpio;
+	if (!(gpch->valid_mask & mask))
+		return;
+	ar2315_gpio_set(mask, (!!value) * mask);  // legacy
+}
+
+static int
+ar2315_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
+{
+	struct ar231x_gpio_chip *gpch =
+		container_of(chip, struct ar231x_gpio_chip, chip);
+	u32 mask = 1 << gpio;
+	if (!(gpch->valid_mask & mask))
+		return -ENXIO;
+	ar2315_gpio_set_output(mask, 0);  // legacy
+	return 0;
+}
+
+static int
+ar2315_gpio_direction_output(struct gpio_chip *chip, unsigned gpio, int value)
+{
+	struct ar231x_gpio_chip *gpch =
+		container_of(chip, struct ar231x_gpio_chip, chip);
+	u32 mask = 1 << gpio;
+	if (!(gpch->valid_mask & mask))
+		return -ENXIO;
+	ar2315_gpio_set_output(mask, mask);  // both legacy
+	ar2315_gpio_set(mask, (!!value) * mask);
+	return 0;
+}
+
+static struct ar231x_gpio_chip ar2315_gpio_chip = {
 	.valid_mask = (1 << 22) - 1,
-	.get_output = ar2315_gpio_get_output,
-	.set_output = ar2315_gpio_set_output,
-	.get = ar2315_gpio_get,
-	.set = ar2315_gpio_set,
+	.chip = {
+		.label                  = "ar2315-gpio",
+		.direction_input        = ar2315_gpio_direction_input,
+		.direction_output       = ar2315_gpio_direction_output,
+		.set                    = ar2315_gpio_set_value,
+		.get                    = ar2315_gpio_get_value,
+		.base                   = 0,
+		.ngpio                  = AR531X_GPIO_IRQ_COUNT, // 22
+	}
 };
 
+// end of gpiolib
+
+
 static struct ar231x_eth ar2315_eth_data = {
 	.reset_base = AR2315_RESET,
 	.reset_mac = AR2315_RESET_ENET0,
@@ -496,7 +546,7 @@ static struct platform_device ar2315_gpi
 };
 
 static void __init
-ar2315_init_gpio(void)
+ar2315_init_gpio_leds(void)
 {
 	static char led_names[6][6];
 	int i, led = 0;
@@ -522,7 +572,7 @@ ar2315_init_gpio(void)
 	platform_device_register(&ar2315_gpio_leds);
 }
 #else
-static inline void ar2315_init_gpio(void)
+static inline void ar2315_init_gpio_leds(void)
 {
 }
 #endif
@@ -537,7 +587,7 @@ ar2315_init_devices(void)
 	ar231x_find_config(ar2315_flash_limit());
 	ar2315_eth_data.macaddr = ar231x_board.config->enet0_mac;
 
-	ar2315_init_gpio();
+	ar2315_init_gpio_leds();
 	platform_device_register(&ar2315_wdt);
 	platform_device_register(&ar2315_spiflash);
 	ar231x_add_ethernet(0, KSEG1ADDR(AR2315_ENET0), AR2315_IRQ_ENET0_INTRS,
@@ -633,6 +683,25 @@ ar2315_time_init(void)
 	mips_hpt_frequency = ar2315_cpu_frequency() / 2;
 }
 
+int __init
+ar2315_gpio_init(void)
+{
+	int ret;
+	struct ar231x_gpio_chip *gpch;
+	gpch = &ar2315_gpio_chip;
+	ret = gpiochip_add(&gpch->chip);
+	if (ret) {
+		printk(KERN_ERR "%s: failed to add gpiochip\n",
+			gpch->chip.label);
+		return ret;
+	}
+	printk(KERN_INFO "%s: registered %d GPIOs\n",
+		gpch->chip.label, gpch->chip.ngpio);
+	return ret;
+}
+
+
+
 void __init
 ar2315_prom_init(void)
 {
@@ -659,7 +728,7 @@ ar2315_prom_init(void)
 			ar231x_devtype = DEV_TYPE_AR2315;
 			break;
 	}
-	ar231x_gpiodev = &ar2315_gpiodev;
+	ar2315_gpio_init();
 	ar231x_board.devid = devid;
 }
 
--- a/arch/mips/ar231x/ar5312.c
+++ b/arch/mips/ar231x/ar5312.c
@@ -23,12 +23,12 @@
 #include <linux/kernel.h>
 #include <linux/reboot.h>
 #include <linux/leds.h>
+#include <linux/gpio.h>
 #include <asm/bootinfo.h>
 #include <asm/reboot.h>
 #include <asm/time.h>
 #include <asm/irq.h>
 #include <asm/io.h>
-#include <gpio.h>
 
 #include <ar231x_platform.h>
 #include <ar5312_regs.h>
@@ -160,17 +160,6 @@ void __init ar5312_irq_init(void)
 	setup_irq(AR5312_IRQ_MISC_INTRS, &cascade);
 }
 
-const struct ar231x_gpiodev ar5312_gpiodev;
-
-static u32
-ar5312_gpio_get_output(void)
-{
-	u32 reg;
-	reg = ~(ar231x_read_reg(AR531X_GPIO_CR));
-	reg &= ar5312_gpiodev.valid_mask;
-	return reg;
-}
-
 static u32
 ar5312_gpio_set_output(u32 mask, u32 val)
 {
@@ -184,11 +173,11 @@ ar5312_gpio_set_output(u32 mask, u32 val
 }
 
 static u32
-ar5312_gpio_get(void)
+ar5312_gpio_get(u32 valid_mask)
 {
 	u32 reg;
 	reg = ar231x_read_reg(AR531X_GPIO_DI);
-	reg &= ar5312_gpiodev.valid_mask;
+	reg &= valid_mask;
 	return reg;
 }
 
@@ -203,14 +192,72 @@ ar5312_gpio_set(u32 mask, u32 value)
 	return reg;
 }
 
-const struct ar231x_gpiodev ar5312_gpiodev = {
-	.valid_mask = (1 << 8) - 1,
-	.get_output = ar5312_gpio_get_output,
-	.set_output = ar5312_gpio_set_output,
-	.get = ar5312_gpio_get,
-	.set = ar5312_gpio_set,
+/*
+ * gpiolib implementations. Original mask based methods preserved
+ */
+static int
+ar5312_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
+{
+	struct ar231x_gpio_chip *gpch =
+		container_of(chip, struct ar231x_gpio_chip, chip);
+	u32 mask = 1 << gpio;
+	u32 rett;
+	if (!(gpch->valid_mask & mask))
+		return 0;
+	rett = ar5312_gpio_get(gpch->valid_mask);
+	return !!(rett & mask);
+}
+
+static void
+ar5312_gpio_set_value(struct gpio_chip *chip, unsigned gpio, int value)
+{
+	struct ar231x_gpio_chip *gpch =
+		container_of(chip, struct ar231x_gpio_chip, chip);
+	u32 mask = 1 << gpio;
+	if (!(gpch->valid_mask & mask))
+		return;
+	ar5312_gpio_set(mask, (!!value) * mask);
+}
+
+static int
+ar5312_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
+{
+	struct ar231x_gpio_chip *gpch =
+		container_of(chip, struct ar231x_gpio_chip, chip);
+	u32 mask = 1 << gpio;
+	if (!(gpch->valid_mask & mask))
+		return -ENXIO;
+	ar5312_gpio_set_output(mask, 0);
+	return 0;
+}
+static int
+ar5312_gpio_direction_output(struct gpio_chip *chip, unsigned gpio, int value)
+{
+	struct ar231x_gpio_chip *gpch =
+		container_of(chip, struct ar231x_gpio_chip, chip);
+	u32 mask = 1 << gpio;
+	if (!(gpch->valid_mask & mask))
+		return -ENXIO;
+	ar5312_gpio_set_output(mask, mask);
+	ar5312_gpio_set(mask, (!!value) * mask);
+	return 0;
+}
+
+static struct ar231x_gpio_chip ar5312_gpio_chip = {
+	.valid_mask = (1 << 22) - 1,
+	.chip = {
+		.label                  = "ar5312-gpio",
+		.direction_input        = ar5312_gpio_direction_input,
+		.direction_output       = ar5312_gpio_direction_output,
+		.set                    = ar5312_gpio_set_value,
+		.get                    = ar5312_gpio_get_value,
+		.base                   = 0,
+		.ngpio                  = AR531X_GPIO_IRQ_COUNT, // 22
+	}
 };
 
+// end of gpiolib
+
 static struct physmap_flash_data ar5312_flash_data = {
 	.width = 2,
 };
@@ -486,6 +533,22 @@ ar5312_time_init(void)
 	mips_hpt_frequency = ar5312_cpu_frequency() / 2;
 }
 
+int __init
+ar5312_gpio_init(void)
+{
+	int ret;
+	struct ar231x_gpio_chip *gpch;
+	gpch = &ar5312_gpio_chip;
+	ret = gpiochip_add(&gpch->chip);
+	if (ret) {
+		printk(KERN_ERR "%s: failed to add gpiochip\n",
+			gpch->chip.label);
+		return ret;
+	}
+	printk(KERN_INFO "%s: registered %d GPIOs\n",
+		gpch->chip.label, gpch->chip.ngpio);
+	return ret;
+}
 
 void __init
 ar5312_prom_init(void)
@@ -509,7 +572,7 @@ ar5312_prom_init(void)
 	devid >>= AR531X_REV_WMAC_MIN_S;
 	devid &= AR531X_REV_CHIP;
 	ar231x_board.devid = (u16) devid;
-	ar231x_gpiodev = &ar5312_gpiodev;
+	ar5312_gpio_init();
 }
 
 void __init
--- a/arch/mips/ar231x/devices.c
+++ b/arch/mips/ar231x/devices.c
@@ -12,8 +12,6 @@
 
 struct ar231x_board_config ar231x_board;
 int ar231x_devtype = DEV_TYPE_UNKNOWN;
-const struct ar231x_gpiodev *ar231x_gpiodev;
-EXPORT_SYMBOL(ar231x_gpiodev);
 
 static struct resource ar231x_eth0_res[] = {
 	{
--- a/arch/mips/ar231x/devices.h
+++ b/arch/mips/ar231x/devices.h
@@ -1,5 +1,6 @@
 #ifndef __AR231X_DEVICES_H
 #define __AR231X_DEVICES_H
+#include <linux/gpio.h>
 
 enum {
 	/* handled by ar5312.c */
@@ -34,4 +35,8 @@ static inline bool is_5312(void)
 	return !is_2315();
 }
 
+struct ar231x_gpio_chip {
+	u32 valid_mask;
+	struct gpio_chip chip;
+};
 #endif
--- a/arch/mips/ar231x/reset.c
+++ b/arch/mips/ar231x/reset.c
@@ -6,11 +6,11 @@
 #include <linux/workqueue.h>
 #include <linux/skbuff.h>
 #include <linux/netlink.h>
+#include <linux/gpio.h>
 #include <net/sock.h>
 #include <asm/uaccess.h>
 #include <ar231x_platform.h>
 #include <ar231x.h>
-#include <gpio.h>
 #include "devices.h"
 
 #define AR531X_RESET_GPIO_IRQ	(AR531X_GPIO_IRQ(ar231x_board.config->resetConfigGpio))
@@ -85,13 +85,12 @@ static void
 reset_button_poll(unsigned long unused)
 {
 	struct event_t *event;
-	int gpio = ~0;
+	int gpio = 0;
 
 	if(!no_release_workaround)
 		return;
 
-	gpio = ar231x_gpiodev->get();
-	gpio &= (1 << (AR531X_RESET_GPIO_IRQ - AR531X_GPIO_IRQ_BASE));
+	gpio = gpio_get_value(AR531X_RESET_GPIO_IRQ - AR531X_GPIO_IRQ_BASE);
 	if(gpio) {
 		rst_button_timer.expires = jiffies + (HZ / 4);
 		add_timer(&rst_button_timer);
@@ -113,7 +112,7 @@ button_handler(int irq, void *dev_id)
 {
 	static int pressed = 0;
 	struct event_t *event;
-	u32 gpio = ~0;
+	u32 gpio = 0;
 
 	event = (struct event_t *) kzalloc(sizeof(struct event_t), GFP_ATOMIC);
 	if (!event)
@@ -121,7 +120,7 @@ button_handler(int irq, void *dev_id)
 
 	pressed = !pressed;
 
-	gpio = ar231x_gpiodev->get() & (1 << (irq - AR531X_GPIO_IRQ_BASE));
+	gpio = gpio_get_value(irq - AR531X_GPIO_IRQ_BASE);
 
 	event->set = gpio;
 	if(!event->set)
--- a/arch/mips/include/asm/mach-ar231x/gpio.h
+++ b/arch/mips/include/asm/mach-ar231x/gpio.h
@@ -3,66 +3,15 @@
 
 #include <ar231x.h>
 
-struct ar231x_gpiodev {
-	u32 valid_mask;
-	u32 (*get_output)(void);
-	u32 (*set_output)(u32 mask, u32 val);
-	u32 (*get)(void);
-	u32 (*set)(u32 mask, u32 val);
-};
-
-extern const struct ar231x_gpiodev *ar231x_gpiodev;
+#define gpio_get_value __gpio_get_value
+#define gpio_set_value __gpio_set_value
+#define gpio_cansleep __gpio_cansleep
 
 /*
  * Wrappers for the generic GPIO layer
  */
 
-static inline int gpio_direction_input(unsigned gpio) {
-	u32 mask = 1 << gpio;
-
-	if (!(ar231x_gpiodev->valid_mask & mask))
-		return -ENXIO;
-
-	ar231x_gpiodev->set_output(mask, 0);
-	return 0;
-}
-
-static inline void gpio_set_value(unsigned gpio, int value) {
-	u32 mask = 1 << gpio;
-
-	if (!(ar231x_gpiodev->valid_mask & mask))
-		return;
-
-	ar231x_gpiodev->set(mask, (!!value) * mask);
-}
-
-static inline int gpio_direction_output(unsigned gpio, int value) {
-	u32 mask = 1 << gpio;
-
-	if (!(ar231x_gpiodev->valid_mask & mask))
-		return -ENXIO;
-
-	ar231x_gpiodev->set_output(mask, mask);
-	ar231x_gpiodev->set(mask, (!!value) * mask);
-	return 0;
-}
-
-/* Reads the gpio pin.  Unchecked function */
-static inline int gpio_get_value(unsigned gpio) {
-	u32 mask = 1 << gpio;
-
-	if (!(ar231x_gpiodev->valid_mask & mask))
-		return 0;
-
-	return !!(ar231x_gpiodev->get() & mask);
-}
-
-static inline int gpio_request(unsigned gpio, const char *label) {
-	return 0;
-}
-
-static inline void gpio_free(unsigned gpio) {
-}
+/* not sure if these are used? */
 
 /* Returns IRQ to attach for gpio.  Unchecked function */
 static inline int gpio_to_irq(unsigned gpio) {
@@ -74,11 +23,6 @@ static inline int irq_to_gpio(unsigned i
 	return (irq - (AR531X_GPIO_IRQ(0)));
 }
 
-static inline int gpio_set_debounce(unsigned gpio, unsigned debounce)
-{
-	return -ENOSYS;
-}
-
 #include <asm-generic/gpio.h> /* cansleep wrappers */
 
 #endif