From f7b9a18917b8ed913f33bda55a33a87cf419c352 Mon Sep 17 00:00:00 2001
From: Werner Almesberger <werner@almesberger.net>
Date: Mon, 20 Jun 2011 23:11:09 -0300
Subject: [PATCH] atusb/fw/: new request ATUSB_GPIO_CLEANUP to re-enable INT0

- board.h (gpio_cleanup), board_app.c (gpio_cleanup): restore INT0
  when done manipulating GPIOs
- board.c (gpio): updated comment explaining how to restore INT0
- include/atusb/ep0.h (enum atspi_requests), ep0.c
  (ATUSB_GPIO_CLEANUP): new request to return to normal operation
  after ATUSB_GPIO
---
 atusb/fw/board.h             | 1 +
 atusb/fw/board_app.c         | 8 +++++++-
 atusb/fw/ep0.c               | 3 +++
 atusb/fw/include/atusb/ep0.h | 2 ++
 4 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/atusb/fw/board.h b/atusb/fw/board.h
index 90fb584..cd94e24 100644
--- a/atusb/fw/board.h
+++ b/atusb/fw/board.h
@@ -81,6 +81,7 @@ uint64_t timer_read(void);
 void timer_init(void);
 
 int gpio(uint8_t port, uint8_t data, uint8_t dir, uint8_t mask, uint8_t *res);
+void gpio_cleanup(void);
 
 void board_init(void);
 void board_app_init(void);
diff --git a/atusb/fw/board_app.c b/atusb/fw/board_app.c
index 3721e8b..17859f8 100644
--- a/atusb/fw/board_app.c
+++ b/atusb/fw/board_app.c
@@ -93,7 +93,7 @@ void timer_init(void)
 
 int gpio(uint8_t port, uint8_t data, uint8_t dir, uint8_t mask, uint8_t *res)
 {
-	EIMSK = 0; /* must reset to recover INT_RF */
+	EIMSK = 0; /* recover INT_RF to ATUSB_GPIO_CLEANUP or an MCU reset */
 
 	switch (port) {
 	case 1:
@@ -138,6 +138,12 @@ int gpio(uint8_t port, uint8_t data, uint8_t dir, uint8_t mask, uint8_t *res)
 }
 
 
+void gpio_cleanup(void)
+{
+	EIMSK = 1 << 0;
+}
+
+
 ISR(INT0_vect)
 {
 	static uint8_t irq;
diff --git a/atusb/fw/ep0.c b/atusb/fw/ep0.c
index 656870b..83ab075 100644
--- a/atusb/fw/ep0.c
+++ b/atusb/fw/ep0.c
@@ -125,6 +125,9 @@ static int my_setup(const struct setup_request *setup)
 			return 0;
 		usb_send(&eps[0], buf, 3, NULL, NULL);
 		return 1;
+	case ATUSB_TO_DEV(ATUSB_GPIO_CLEANUP):
+		gpio_cleanup();
+		return 1;
 
 	case ATUSB_TO_DEV(ATUSB_SLP_TR):
 		debug("ATUSB_SLP_TR\n");
diff --git a/atusb/fw/include/atusb/ep0.h b/atusb/fw/include/atusb/ep0.h
index 4775c3c..391b114 100644
--- a/atusb/fw/include/atusb/ep0.h
+++ b/atusb/fw/include/atusb/ep0.h
@@ -27,6 +27,7 @@
  * ->host	ATUSB_TIMER		-		-	#bytes (6)
  * ->host	ATUSB_GPIO		dir+data	mask+p#	3
  * host->	ATUSB_SLP_TR		-		-	0
+ * host->	ATUSB_GPIO_CLEANUP	-		-	0
  *
  * host->	ATUSB_REG_WRITE		value		addr	0
  * ->host	ATUSB_REG_READ		-		addr	1
@@ -80,6 +81,7 @@ enum atspi_requests {
 	ATUSB_TIMER,
 	ATUSB_GPIO,
 	ATUSB_SLP_TR,
+	ATUSB_GPIO_CLEANUP,
 	ATUSB_REG_WRITE			= 0x20,	/* transceiver group */
 	ATUSB_REG_READ,
 	ATUSB_BUF_WRITE,