Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=b66545e7ae80b4b0eef3f7884ef9260455070be9
Commit: b66545e7ae80b4b0eef3f7884ef9260455070be9
Parent: 9b73e76f3cf63379dcf45fcd4f112f5812418d0a
Author: Andrew Victor <[EMAIL PROTECTED]>
AuthorDate: Fri Nov 23 16:09:10 2007 +0100
Committer: Russell King <[EMAIL PROTECTED]>
CommitDate: Sat Jan 26 15:00:30 2008 +0000
[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: Andrew Victor <[EMAIL PROTECTED]>
Signed-off-by: Russell King <[EMAIL PROTECTED]>
---
arch/arm/mach-at91/gpio.c | 62 +++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 62 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mach-at91/gpio.c b/arch/arm/mach-at91/gpio.c
index aa2d365..6aeddd6 100644
--- a/arch/arm/mach-at91/gpio.c
+++ b/arch/arm/mach-at91/gpio.c
@@ -13,6 +13,8 @@
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
#include <linux/kernel.h>
#include <linux/list.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.
*/
-
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