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plat-nomadik: add custom dbg_show for GPIO

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Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Rabin Vincent 2010-03-04 17:39:05 +05:30 committed by Linus Walleij
parent e493e06fed
commit d0b543c772
1 changed files with 92 additions and 0 deletions
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92
arch/arm/plat-nomadik/gpio.c
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@ -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,
};