sdmmc_poll: add edge triggered polling support

commit 69a36026f89247a076ee8ca5232d068f241e6879
Author: Aidan MacDonald <[email protected]>
Date:   Wed Aug 19 11:07:05 2026 +0100

    sdmmc_poll: add edge triggered polling support
    
    Change-Id: I958a09efc055d474da5e03a06d80719dbb2f5b14

diff --git a/firmware/drivers/sdmmc_poll.c b/firmware/drivers/sdmmc_poll.c
index 4c28e9aea3..1e1d9d5baf 100644
--- a/firmware/drivers/sdmmc_poll.c
+++ b/firmware/drivers/sdmmc_poll.c
@@ -42,7 +42,10 @@ static int sdmmc_poll_timeout(struct timeout *tmo)
         sdmmc_host_set_medium_present(poll->host, true);
     }
 
-    return SDCARD_POLL_TICKS;
+    if (poll->is_polling || (poll->curr_state != poll->last_state))
+        return SDCARD_POLL_TICKS;
+
+    return 0;
 }
 
 void sdmmc_poll_init(struct sdmmc_poll *poll,
@@ -58,7 +61,15 @@ void sdmmc_poll_init(struct sdmmc_poll *poll,
 }
 
 void sdmmc_poll_start(struct sdmmc_poll *poll)
+{
+    poll->is_polling = true;
+    timeout_register(&poll->timeout, sdmmc_poll_timeout,
+                     SDCARD_POLL_TICKS, (intptr_t)poll);
+}
+
+void sdmmc_poll_event(struct sdmmc_poll *poll)
 {
     timeout_register(&poll->timeout, sdmmc_poll_timeout,
                      SDCARD_POLL_TICKS, (intptr_t)poll);
+    sdmmc_poll_timeout(&poll->timeout);
 }
diff --git a/firmware/export/sdmmc_poll.h b/firmware/export/sdmmc_poll.h
index 3472c2b888..3323644e2f 100644
--- a/firmware/export/sdmmc_poll.h
+++ b/firmware/export/sdmmc_poll.h
@@ -32,6 +32,7 @@ struct sdmmc_poll
     bool (*check_inserted)(void);
 
     bool is_inserted;
+    bool is_polling;
     bool last_state;
     bool curr_state;
 };
@@ -42,7 +43,11 @@ struct sdmmc_poll
  * in insertion state is detected via the check_inserted()
  * callback.
  *
- * Call sdmmc_poll_start() to start the poll timer.
+ * Call sdmmc_poll_start() to start the poll timer if you
+ * use level triggered polling.
+ *
+ * To use edge triggered events call sdmmc_poll_event() if
+ * the return value of check_inserted() may have changed.
  *
  * Changes in the insertion state are debounced before they
  * are reported to the sdmmc_host.
@@ -52,5 +57,6 @@ void sdmmc_poll_init(struct sdmmc_poll *poll,
                      struct sdmmc_host *host,
                      bool (*check_inserted) (void));
 void sdmmc_poll_start(struct sdmmc_poll *poll);
+void sdmmc_poll_event(struct sdmmc_poll *poll);
 
 #endif /* __SDMMC_POLL_H__ */
-- 
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