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authorRabin Vincent <rabin.vincent@stericsson.com>2010-03-04 13:09:05 +0100
committerLinus Walleij <linus.walleij@linaro.org>2011-03-14 14:05:15 +0100
commitd0b543c772af20f576e204cae442ccfd221631a7 (patch)
treeaf998ba41832776ed506bd071c8708969d42515a /arch/arm/plat-nomadik/gpio.c
parentplat-nomadik: support varying number of GPIOs per block (diff)
downloadlinux-d0b543c772af20f576e204cae442ccfd221631a7.tar.xz
linux-d0b543c772af20f576e204cae442ccfd221631a7.zip
plat-nomadik: add custom dbg_show for GPIO
Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'arch/arm/plat-nomadik/gpio.c')
-rw-r--r--arch/arm/plat-nomadik/gpio.c92
1 files changed, 92 insertions, 0 deletions
diff --git a/arch/arm/plat-nomadik/gpio.c b/arch/arm/plat-nomadik/gpio.c
index 30bb92a746e1..5b5fd1ee3c04 100644
--- a/arch/arm/plat-nomadik/gpio.c
+++ b/arch/arm/plat-nomadik/gpio.c
@@ -604,6 +604,97 @@ static int nmk_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
return NOMADIK_GPIO_TO_IRQ(nmk_chip->chip.base) + offset;
}
+#ifdef CONFIG_DEBUG_FS
+
+#include <linux/seq_file.h>
+
+static void nmk_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
+{
+ int mode;
+ unsigned i;
+ unsigned gpio = chip->base;
+ int is_out;
+ struct nmk_gpio_chip *nmk_chip =
+ container_of(chip, struct nmk_gpio_chip, chip);
+ const char *modes[] = {
+ [NMK_GPIO_ALT_GPIO] = "gpio",
+ [NMK_GPIO_ALT_A] = "altA",
+ [NMK_GPIO_ALT_B] = "altB",
+ [NMK_GPIO_ALT_C] = "altC",
+ };
+
+ for (i = 0; i < chip->ngpio; i++, gpio++) {
+ const char *label = gpiochip_is_requested(chip, i);
+ bool pull;
+ u32 bit = 1 << i;
+
+ if (!label)
+ continue;
+
+ is_out = readl(nmk_chip->addr + NMK_GPIO_DIR) & bit;
+ pull = !(readl(nmk_chip->addr + NMK_GPIO_PDIS) & bit);
+ mode = nmk_gpio_get_mode(gpio);
+ seq_printf(s, " gpio-%-3d (%-20.20s) %s %s %s %s",
+ gpio, label,
+ is_out ? "out" : "in ",
+ chip->get
+ ? (chip->get(chip, i) ? "hi" : "lo")
+ : "? ",
+ (mode < 0) ? "unknown" : modes[mode],
+ pull ? "pull" : "none");
+
+ if (!is_out) {
+ int irq = gpio_to_irq(gpio);
+ struct irq_desc *desc = irq_to_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");
+ }
+}
+
+#else
+#define nmk_gpio_dbg_show NULL
+#endif
+
/* This structure is replicated for each GPIO block allocated at probe time */
static struct gpio_chip nmk_gpio_template = {
.direction_input = nmk_gpio_make_input,
@@ -611,6 +702,7 @@ static struct gpio_chip nmk_gpio_template = {
.direction_output = nmk_gpio_make_output,
.set = nmk_gpio_set_output,
.to_irq = nmk_gpio_to_irq,
+ .dbg_show = nmk_gpio_dbg_show,
.can_sleep = 0,
};