drivers/sdmmc/card_detect.c

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#include <debug.h>
#include <delayed_work.h>
#include <malloc.h>
#include <slist.h>
#include <workqueue.h>
#include <chip/portmux.h>
#include <gpio/gpio_irq_handler.h>
#include <sdmmc/sdmmc.h>

#include <app/timer.h>
#include <app/workqueue.h>

#define SDMMC_CD_DELAY_US       20000

struct sdmmc_cd {
        struct sdmmc_slot               *slot;
        gpio_pin_t                      pin;
        struct workqueue_item           work;
        struct delayed_work             dwork;
        struct gpio_irq_handler         irqh;
};

static void sdmmc_cd_interrupt(void *data)
{
        struct sdmmc_cd *cd = data;

        gpio_disable_interrupt(cd->pin);

        /* Wait for WP and CD signals to stabilize before detecting */
        delayed_work_run_us(&cd->dwork, &cd->work, SDMMC_CD_DELAY_US);
}

static void sdmmc_cd_process(void *data)
{
        struct sdmmc_cd *cd = data;
        int             value;

        gpio_clear_int_flag(cd->pin);
        gpio_enable_interrupt(cd->pin);

        value = !gpio_get_value(cd->pin);

        dbg_verbose("Notify slot%u card detect %d!\n", cd->slot->id, value);
        sdmmc_slot_notify_card_detect(cd->slot, value);
}

struct sdmmc_cd *sdmmc_cd_init(struct sdmmc_slot *slot, gpio_pin_t pin)
{
        struct sdmmc_cd *cd;

        cd = malloc(sizeof(struct sdmmc_cd));
        if (cd == NULL) {
                dbg_error("sdmmc_cd_init: Out of memory!\n");
                return NULL;
        }
        cd->slot = slot;
        cd->pin = pin;
        workqueue_init_item(&cd->work, sdmmc_cd_process, cd);
        delayed_work_init(&cd->dwork, &sdmmc_timer, &sdmmc_workqueue);

        gpio_init_irq_handler(&cd->irqh, pin, sdmmc_cd_interrupt, cd);

        gpio_register_irq_handler(&cd->irqh);

        return cd;
}

void sdmmc_cd_enable(struct sdmmc_cd *cd)
{
        /*
         * Wait for pins to stabilize after power-on, and send initial
         * slot notify event.
         */
        delayed_work_run_us(&cd->dwork, &cd->work, SDMMC_CD_DELAY_US);
}

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