diff --git a/arch/arm/plat-s3c/include/plat/adc.h b/arch/arm/plat-s3c/include/plat/adc.h
index ef92e50..d847bd4 100644
--- a/arch/arm/plat-s3c/include/plat/adc.h
+++ b/arch/arm/plat-s3c/include/plat/adc.h
@@ -22,7 +22,8 @@
 extern struct s3c_adc_client *
 	s3c_adc_register(struct platform_device *pdev,
 			 void (*select)(unsigned selected),
-			 void (*conv)(unsigned d0, unsigned d1),
+			 void (*conv)(unsigned d0, unsigned d1,
+				      unsigned *samples_left),
 			 unsigned int is_ts);
 
 extern void s3c_adc_release(struct s3c_adc_client *client);
diff --git a/arch/arm/plat-s3c24xx/adc.c b/arch/arm/plat-s3c24xx/adc.c
index 91adfa7..ee1baf1 100644
--- a/arch/arm/plat-s3c24xx/adc.c
+++ b/arch/arm/plat-s3c24xx/adc.c
@@ -45,7 +45,8 @@
 	unsigned char		 channel;
 
 	void	(*select_cb)(unsigned selected);
-	void	(*convert_cb)(unsigned val1, unsigned val2);
+	void	(*convert_cb)(unsigned val1, unsigned val2,
+			      unsigned *samples_left);
 };
 
 struct adc_device {
@@ -158,7 +159,8 @@
 
 struct s3c_adc_client *s3c_adc_register(struct platform_device *pdev,
 					void (*select)(unsigned int selected),
-					void (*conv)(unsigned d0, unsigned d1),
+					void (*conv)(unsigned d0, unsigned d1,
+						     unsigned *samples_left),
 					unsigned int is_ts)
 {
 	struct s3c_adc_client *client;
@@ -227,9 +229,10 @@
 	data1 = readl(adc->regs + S3C2410_ADCDAT1);
 	adc_dbg(adc, "read %d: 0x%04x, 0x%04x\n", client->nr_samples, data0, data1);
 
-	(client->convert_cb)(data0 & 0x3ff, data1 & 0x3ff);
+	client->nr_samples--;
+	(client->convert_cb)(data0 & 0x3ff, data1 & 0x3ff, &client->nr_samples);
 
-	if (--client->nr_samples > 0) {
+	if (client->nr_samples > 0) {
 		/* fire another conversion for this */
 
 		client->select_cb(1);