[WIP] Add devmem2 based tests

Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>

3 files changed, 97 insertions, 17 deletions

diff --git a/compatible_devices.c b/compatible_devices.c
index dd82b29..d63d6bc 100644
--- a/compatible_devices.c
+++ b/compatible_devices.c
@@ -269,6 +269,21 @@ int device_is_compatible(int debug)
 	return false;
 }
 
+bool device_has_devmem2(int debug)
+{
+	int rc = 0;
+	int err;
+
+	rc = system("devmem2 2>&1 > /dev/null");
+	if (rc != 256) {
+		err = errno;
+		printf("%s: rc=%d errno=%d\n", __func__, rc, err);
+		return false;
+	}
+
+	return true;
+}
+
 bool device_has_gpioget(int debug)
 {
 	int rc = 0;
diff --git a/compatible_devices.h b/compatible_devices.h
index 5c0ea99..4d5c8df 100644
--- a/compatible_devices.h
+++ b/compatible_devices.h
@@ -20,6 +20,7 @@
 
 #include <stdbool.h>
 
+bool device_has_devmem2(int debug);
 bool device_has_gpioget(int debug);
 bool device_has_gpioset(int debug);
 int device_is_compatible(int debug);
diff --git a/tests.c b/tests.c
index 0279354..1e94dba 100644
--- a/tests.c
+++ b/tests.c
@@ -31,8 +31,9 @@
 
 #include "tests.h"
 
-static int test_output_value(int debug, char *devmem, int fd, size_t page_size,
-			     char *bank, int gpio_offset)
+static int test_output_value_with_libgpiod(int debug, char *devmem, int fd,
+					   size_t page_size, char *bank,
+					   int gpio_offset)
 {
 	char *gpioset_high_command;
 	char *gpioset_low_command;
@@ -78,8 +79,61 @@ static int test_output_value(int debug, char *devmem, int fd, size_t page_size,
 	return 0;
 }
 
-static int test_direction(int debug, char *devmem, int fd, size_t page_size,
-			  char *bank, int gpio_offset)
+static int test_flash_with_devmem2(int debug, char *devmem, int fd,
+				   size_t page_size)
+{
+	int rc;
+
+	/* On Parabola with the nonfree u-boot and the Replicant 11 kernel,
+	 * the gpio value register is 0x0 after boot, so I hope that it is safe
+	 * to set it to 0x0 too on Replicant 6, even if after boot, its value
+	 * is 0x1.
+	 * We also used the default values after booting Parabola for the gpio
+	 * direction register.
+	 */
+
+	/* Set the GPIO to input */
+	rc = system("devmem2 0x11400260 w 0x2000");
+	assert(rc == 0);
+
+	rc = gpio_get_direction(devmem, fd, page_size, "gpj1", 1);
+	assert (rc == GPIO_INPUT);
+
+	/* Set the GPIO to output */
+	rc = system("devmem2 0x11400260 w 0x2002");
+	assert(rc == 0);
+
+	rc = gpio_get_direction(devmem, fd, page_size, "gpj1", 1);
+	assert (rc == GPIO_OUTPUT);
+
+	/* Set the pin LOW */
+	rc = system("devmem2 0x11400264 w 0");
+	assert(rc == 0);
+
+	rc = gpio_get_output_value(devmem, fd, page_size, "gpj1", 1);
+	assert (rc == GPIO_VALUE_LOW);
+
+	/* Set the pin HIGH */
+	rc = system("devmem2 0x11400264 w 2");
+	assert(rc == 0);
+
+	rc = gpio_get_output_value(devmem, fd, page_size, "gpj1", 1);
+	assert (rc == GPIO_VALUE_HIGH);
+
+	/* Set it to low again */
+	rc = system("devmem2 0x11400264 w 0");
+	assert(rc == 0);
+
+	rc = gpio_get_output_value(devmem, fd, page_size, "gpj1", 1);
+	assert (rc == GPIO_VALUE_LOW);
+
+	return 0;
+
+}
+
+static int test_direction_with_libgpiod(int debug, char *devmem, int fd,
+					size_t page_size, char *bank,
+					int gpio_offset)
 {
 	char *gpioget_command;
 	char *gpioset_command;
@@ -122,27 +176,37 @@ static int test_direction(int debug, char *devmem, int fd, size_t page_size,
 
 int run_tests(int debug, char *devmem, int fd, size_t page_size)
 {
+	bool has_devmem2;
 	bool has_gpioget;
 	bool has_gpioset;
 
+	has_devmem2 = device_has_devmem2(debug);
 	has_gpioget = device_has_gpioget(debug);
-	if (!has_gpioget) {
-		printf("[ !! ] gpioget not found: skipping tests\n");
-	}
-
 	has_gpioset = device_has_gpioset(debug);
-	if (!has_gpioset) {
-		printf("[ !! ] gpioset not found: skipping tests\n");
-	}
 
-	if (!has_gpioget || !has_gpioset)
-		return -1;
+	if (has_gpioget && has_gpioset) {
+		test_direction_with_libgpiod(debug, devmem, fd, page_size, "gpj1", 1);
+		printf("[ OK ] libgpiod GPIO direction test\n");
+
+		test_output_value_with_libgpiod(debug, devmem, fd, page_size, "gpj1", 1);
+		printf("[ OK ] libgpiod GPIO output value test\n");
+	} else {
+		if (!has_gpioget)
+			printf("[ !! ] gpioget not found: skipping"
+			       " libgpiod direction and output tests\n");
 
-	test_direction(debug, devmem, fd, page_size, "gpj1", 1);
-	printf("[ OK ] GPIO direction\n");
+		if (!has_gpioset)
+			printf("[ !! ] gpioset not found: skipping"
+			       " libgpiod direction and output tests\n");
+	}
 
-	test_output_value(debug, devmem, fd, page_size, "gpj1", 1);
-	printf("[ OK ] GPIO output value\n");
+	if (has_devmem2) {
+		test_flash_with_devmem2(debug, devmem, fd, page_size);
+		printf("[ OK ] devmem2 GPIO direction and output test\n");
+	} else {
+		printf("[ !! ] devmem2 not found: skipping"
+			       " devmem2 direction and output tests\n");
+	}
 
 	return 0;
 }