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Commit b66545e7 authored by Andrew Victor's avatar Andrew Victor Committed by Russell King
Browse files

[ARM] 4602/3: AT91: debugfs interface to view GPIO pin state 



This patch adds a debug interface (if CONFIG_DEBUG_FS is selected) to
display the basic configuration and current state of the GPIO pins on
the Atmel AT91 processors.

Signed-off-by: default avatarAndrew Victor <andrew@sanpeople.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 9b73e76f

arch/arm/mach-at91/gpio.c

+62 −0
Original line number Original line Diff line number Diff line
@@ -13,6 +13,8 @@ 
#include <linux/errno.h>

#include <linux/errno.h>

#include <linux/interrupt.h>

#include <linux/interrupt.h>

#include <linux/irq.h>

#include <linux/irq.h>

#include <linux/debugfs.h>

#include <linux/seq_file.h>

#include <linux/kernel.h>

#include <linux/kernel.h>

#include <linux/list.h>

#include <linux/list.h>

#include <linux/module.h>

#include <linux/module.h>
@@ -414,6 +416,66 @@ static void gpio_irq_handler(unsigned irq, struct irq_desc *desc) 




/*--------------------------------------------------------------------------*/

/*--------------------------------------------------------------------------*/





#ifdef CONFIG_DEBUG_FS



static int at91_gpio_show(struct seq_file *s, void *unused)

{

	int bank, j;



	/* print heading */

	seq_printf(s, "Pin\t");

	for (bank = 0; bank < gpio_banks; bank++) {

		seq_printf(s, "PIO%c\t", 'A' + bank);

	};

	seq_printf(s, "\n\n");



	/* print pin status */

	for (j = 0; j < 32; j++) {

		seq_printf(s, "%i:\t", j);



		for (bank = 0; bank < gpio_banks; bank++) {

			unsigned	pin  = PIN_BASE + (32 * bank) + j;

			void __iomem	*pio = pin_to_controller(pin);

			unsigned	mask = pin_to_mask(pin);



			if (__raw_readl(pio + PIO_PSR) & mask)

				seq_printf(s, "GPIO:%s", __raw_readl(pio + PIO_PDSR) & mask ? "1" : "0");

			else

				seq_printf(s, "%s", __raw_readl(pio + PIO_ABSR) & mask ? "B" : "A");



			seq_printf(s, "\t");

		}



		seq_printf(s, "\n");

	}



	return 0;

}



static int at91_gpio_open(struct inode *inode, struct file *file)

{

	return single_open(file, at91_gpio_show, NULL);

}



static const struct file_operations at91_gpio_operations = {

	.open		= at91_gpio_open,

	.read		= seq_read,

	.llseek		= seq_lseek,

	.release	= single_release,

};



static int __init at91_gpio_debugfs_init(void)

{

	/* /sys/kernel/debug/at91_gpio */

	(void) debugfs_create_file("at91_gpio", S_IFREG | S_IRUGO, NULL, NULL, &at91_gpio_operations);

	return 0;

}

postcore_initcall(at91_gpio_debugfs_init);



#endif



/*--------------------------------------------------------------------------*/



/*

/*

 * Called from the processor-specific init to enable GPIO interrupt support.

 * Called from the processor-specific init to enable GPIO interrupt support.

 */

 */