iio: introduce type casts to avoid __ucmpdi2 calls

This patch type casts the switch control variable to 32 bits in order to
prevent a call __ucmpdi2 generated by some versions of gcc.

This fixes an undefined reference to `__ucmpdi2' when compiled for arch/blackfin
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/iio/adc/ad7192.c

@@ -795,7 +795,7 @@ static ssize_t ad7192_set(struct device *dev,
 		return -EBUSY;
 	}
 
-	switch (this_attr->address) {
+	switch ((u32) this_attr->address) {
 	case AD7192_REG_GPOCON:
 		if (val)
 			st->gpocon |= AD7192_GPOCON_BPDSW;

drivers/staging/iio/adc/ad7280a.c

@@ -600,7 +600,7 @@ static ssize_t ad7280_read_channel_config(struct device *dev,
 	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 	unsigned val;
 
-	switch (this_attr->address) {
+	switch ((u32) this_attr->address) {
 	case AD7280A_CELL_OVERVOLTAGE:
 		val = 1000 + (st->cell_threshhigh * 1568) / 100;
 		break;
@@ -636,7 +636,7 @@ static ssize_t ad7280_write_channel_config(struct device *dev,
 	if (ret)
 		return ret;
 
-	switch (this_attr->address) {
+	switch ((u32) this_attr->address) {
 	case AD7280A_CELL_OVERVOLTAGE:
 	case AD7280A_CELL_UNDERVOLTAGE:
 		val = ((val - 1000) * 100) / 1568; /* LSB 15.68mV */
@@ -652,7 +652,7 @@ static ssize_t ad7280_write_channel_config(struct device *dev,
 	val = clamp(val, 0L, 0xFFL);
 
 	mutex_lock(&indio_dev->mlock);
-	switch (this_attr->address) {
+	switch ((u32) this_attr->address) {
 	case AD7280A_CELL_OVERVOLTAGE:
 		st->cell_threshhigh = val;
 		break;

drivers/staging/iio/dds/ad9832.c

@@ -88,7 +88,7 @@ static ssize_t ad9832_write(struct device *dev,
 		goto error_ret;
 
 	mutex_lock(&indio_dev->mlock);
-	switch (this_attr->address) {
+	switch ((u32) this_attr->address) {
 	case AD9832_FREQ0HM:
 	case AD9832_FREQ1HM:
 		ret = ad9832_write_frequency(st, this_attr->address, val);

drivers/staging/iio/dds/ad9834.c

@@ -77,7 +77,7 @@ static ssize_t ad9834_write(struct device *dev,
 		goto error_ret;
 
 	mutex_lock(&indio_dev->mlock);
-	switch (this_attr->address) {
+	switch ((u32) this_attr->address) {
 	case AD9834_REG_FREQ0:
 	case AD9834_REG_FREQ1:
 		ret = ad9834_write_frequency(st, this_attr->address, val);
@@ -153,7 +153,7 @@ static ssize_t ad9834_store_wavetype(struct device *dev,
 
 	mutex_lock(&indio_dev->mlock);
 
-	switch (this_attr->address) {
+	switch ((u32) this_attr->address) {
 	case 0:
 		if (sysfs_streq(buf, "sine")) {
 			st->control &= ~AD9834_MODE;

drivers/staging/iio/impedance-analyzer/ad5933.c

@@ -329,7 +329,7 @@ static ssize_t ad5933_show(struct device *dev,
 	int ret = 0, len = 0;
 
 	mutex_lock(&indio_dev->mlock);
-	switch (this_attr->address) {
+	switch ((u32) this_attr->address) {
 	case AD5933_OUT_RANGE:
 		len = sprintf(buf, "%d\n",
 			      st->range_avail[(st->ctrl_hb >> 1) & 0x3]);
@@ -380,7 +380,7 @@ static ssize_t ad5933_store(struct device *dev,
 	}
 
 	mutex_lock(&indio_dev->mlock);
-	switch (this_attr->address) {
+	switch ((u32) this_attr->address) {
 	case AD5933_OUT_RANGE:
 		for (i = 0; i < 4; i++)
 			if (val == st->range_avail[i]) {