diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/plat-nomadik/gpio.c | 92 |
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, }; |