introduce gpio sample

Signed-off-by: Thanos Makatos <thanos.makatos@nutanix.com>

2 files changed, 40 insertions, 0 deletions

diff --git a/samples/CMakeLists.txt b/samples/CMakeLists.txt
index d12a813..8a03c30 100644
--- a/samples/CMakeLists.txt
+++ b/samples/CMakeLists.txt
@@ -30,3 +30,6 @@
 
 add_executable(test_read test_read.c)
 add_executable(test_mmap test_mmap.c)
+
+add_executable(gpio-pci-idio-16 gpio-pci-idio-16.c)
+target_link_libraries(gpio-pci-idio-16 muser)
diff --git a/samples/gpio-pci-idio-16.c b/samples/gpio-pci-idio-16.c
new file mode 100644
index 0000000..e16cae2
--- /dev/null
+++ b/samples/gpio-pci-idio-16.c
@@ -0,0 +1,37 @@
+/* gpio-pci-idio-16 */
+
+#include <stdio.h>
+
+#include "../lib/muser.h"
+
+ssize_t
+bar2_access(void *pvt, char * const buf, size_t count, loff_t offset,
+           const bool is_write)
+{
+    static char n;
+
+    if (offset == 0 && !is_write)
+        buf[0] = n++ / 3;
+
+    return count;
+}
+
+int main(int argc, char **argv)
+{
+    lm_dev_info_t dev_info = {
+        .pci_info = {
+            .id = {.vid = 0x494F, .did = 0x0DC8 },
+            .reg_info[LM_DEV_BAR2_REG_IDX] = {
+                .flags = LM_REG_FLAG_RW,
+                .size = 0x100,
+                .fn = &bar2_access
+            },
+            .irq_count[LM_DEV_INTX_IRQ_IDX] = 1,
+        },
+        .uuid = argv[1],
+    };
+
+    return lm_ctx_run(&dev_info);
+}
+
+/* ex: set tabstop=4 shiftwidth=4 softtabstop=4 expandtab: */