Index: uspace/drv/audio/sb16/dsp.c
===================================================================
--- uspace/drv/audio/sb16/dsp.c	(revision d5c1051faf4391647834d99babdd4a44ee5d9700)
+++ uspace/drv/audio/sb16/dsp.c	(revision e211ea04fccf33d4cb2092f630a29e893e096a02)
@@ -89,5 +89,5 @@
 }
 
-static inline int dsp_read(sb_dsp_t *dsp, uint8_t *data)
+static inline errno_t dsp_read(sb_dsp_t *dsp, uint8_t *data)
 {
 	assert(data);
@@ -106,5 +106,5 @@
 }
 
-static inline int dsp_write(sb_dsp_t *dsp, uint8_t data)
+static inline errno_t dsp_write(sb_dsp_t *dsp, uint8_t data)
 {
 	assert(dsp);
@@ -159,5 +159,5 @@
 }
 
-static inline int setup_dma(sb_dsp_t *dsp, uintptr_t pa, size_t size)
+static inline errno_t setup_dma(sb_dsp_t *dsp, uintptr_t pa, size_t size)
 {
 	async_sess_t *sess = ddf_dev_parent_sess_get(dsp->sb_dev);
@@ -168,5 +168,5 @@
 }
 
-static inline int setup_buffer(sb_dsp_t *dsp, size_t size)
+static inline errno_t setup_buffer(sb_dsp_t *dsp, size_t size)
 {
 	assert(dsp);
@@ -178,5 +178,5 @@
 	void *buffer = AS_AREA_ANY;
 	
-	int ret = dmamem_map_anonymous(size, DMAMEM_16MiB | 0x0000ffff,
+	errno_t ret = dmamem_map_anonymous(size, DMAMEM_16MiB | 0x0000ffff,
 	    AS_AREA_WRITE | AS_AREA_READ, 0, &pa, &buffer);
 	if (ret != EOK) {
@@ -202,5 +202,5 @@
 }
 
-int sb_dsp_init(sb_dsp_t *dsp, sb16_regs_t *regs, ddf_dev_t *dev,
+errno_t sb_dsp_init(sb_dsp_t *dsp, sb16_regs_t *regs, ddf_dev_t *dev,
     int dma8, int dma16)
 {
@@ -215,5 +215,5 @@
 	dsp_reset(dsp);
 	uint8_t response;
-	const int ret = dsp_read(dsp, &response);
+	const errno_t ret = dsp_read(dsp, &response);
 	if (ret != EOK) {
 		ddf_log_error("Failed to read DSP reset response value.");
@@ -294,5 +294,5 @@
 }
 
-int sb_dsp_get_buffer_position(sb_dsp_t *dsp, size_t *pos)
+errno_t sb_dsp_get_buffer_position(sb_dsp_t *dsp, size_t *pos)
 {
 	if (dsp->state == DSP_NO_BUFFER)
@@ -304,5 +304,5 @@
 	// TODO: Assumes DMA 16
 	size_t remain;
-	int rc = hw_res_dma_channel_remain(sess, dsp->dma16_channel, &remain);
+	errno_t rc = hw_res_dma_channel_remain(sess, dsp->dma16_channel, &remain);
 	if (rc == EOK) {
 		*pos = dsp->buffer.size - remain;
@@ -311,8 +311,8 @@
 }
 
-int sb_dsp_test_format(sb_dsp_t *dsp, unsigned *channels, unsigned *rate,
+errno_t sb_dsp_test_format(sb_dsp_t *dsp, unsigned *channels, unsigned *rate,
   pcm_sample_format_t *format)
 {
-	int ret = EOK;
+	errno_t ret = EOK;
 	if (*channels == 0 || *channels > 2) {
 		*channels = 2;
@@ -336,5 +336,5 @@
 }
 
-int sb_dsp_set_event_session(sb_dsp_t *dsp, async_sess_t *session)
+errno_t sb_dsp_set_event_session(sb_dsp_t *dsp, async_sess_t *session)
 {
 	assert(dsp);
@@ -353,5 +353,5 @@
 }
 
-int sb_dsp_get_buffer(sb_dsp_t *dsp, void **buffer, size_t *size)
+errno_t sb_dsp_get_buffer(sb_dsp_t *dsp, void **buffer, size_t *size)
 {
 	assert(dsp);
@@ -364,5 +364,5 @@
 	assert(dsp->buffer.data == NULL);
 
-	const int ret = setup_buffer(dsp, *size);
+	const errno_t ret = setup_buffer(dsp, *size);
 	if (ret == EOK) {
 		ddf_log_debug("Providing buffer: %p, %zu B.",
@@ -378,5 +378,5 @@
 }
 
-int sb_dsp_release_buffer(sb_dsp_t *dsp)
+errno_t sb_dsp_release_buffer(sb_dsp_t *dsp)
 {
 	assert(dsp);
@@ -392,5 +392,5 @@
 }
 
-int sb_dsp_start_playback(sb_dsp_t *dsp, unsigned frames,
+errno_t sb_dsp_start_playback(sb_dsp_t *dsp, unsigned frames,
     unsigned channels, unsigned sampling_rate, pcm_sample_format_t format)
 {
@@ -441,5 +441,5 @@
 }
 
-int sb_dsp_stop_playback(sb_dsp_t *dsp, bool immediate)
+errno_t sb_dsp_stop_playback(sb_dsp_t *dsp, bool immediate)
 {
 	assert(dsp);
@@ -471,5 +471,5 @@
 }
 
-int sb_dsp_start_capture(sb_dsp_t *dsp, unsigned frames,
+errno_t sb_dsp_start_capture(sb_dsp_t *dsp, unsigned frames,
     unsigned channels, unsigned sampling_rate, pcm_sample_format_t format)
 {
@@ -517,5 +517,5 @@
 }
 
-int sb_dsp_stop_capture(sb_dsp_t *dsp, bool immediate)
+errno_t sb_dsp_stop_capture(sb_dsp_t *dsp, bool immediate)
 {
 	assert(dsp);