tests: Mock file i/o for linux_mtd and linux_spi tests

This patch adds an init-shutdown test for linux_mtd. Since
linux_mtd is using file i/o operations, those are added to the
framework and mocked.

Another driver linux_spi which is also using file i/o, got an upgrade
in this patch, and it is now reading max buffer size from sysfs (using
mocked file i/o).

A good side-effect is that linux_mtd is the first test for opaque
masters, which is great to have in preparation for a change like
CB:56103 but for opaque masters.

BUG=b:181803212
TEST=builds and ninja test

Change-Id: I73f0d6ff2ad5074add7a721ed3416230d3647e3f
Signed-off-by: Anastasia Klimchuk <aklm@chromium.org>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/56413
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/tests/io_mock.h b/tests/io_mock.h
index c69cd38d..adb5f3b3 100644
--- a/tests/io_mock.h
+++ b/tests/io_mock.h
@@ -31,6 +31,9 @@
 #ifndef _IO_MOCK_H_
 #define _IO_MOCK_H_
 
+/* Required for `FILE *` */
+#include <stdio.h>
+
 /* Define libusb symbols to avoid dependency on libusb.h */
 struct libusb_device_handle;
 typedef struct libusb_device_handle libusb_device_handle;
@@ -79,6 +82,12 @@ struct io_mock {
 	int (*ioctl)(void *state, int fd, unsigned long request, va_list args);
 	int (*read)(void *state, int fd, void *buf, size_t sz);
 	int (*write)(void *state, int fd, const void *buf, size_t sz);
+
+	/* Standard I/O */
+	FILE* (*fopen)(void *state, const char *pathname, const char *mode);
+	char* (*fgets)(void *state, char *buf, int len, FILE *fp);
+	size_t (*fread)(void *state, void *buf, size_t size, size_t len, FILE *fp);
+	int (*fclose)(void *state, FILE *fp);
 };
 
 void io_mock_register(const struct io_mock *io);