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path: root/drivers/input/touchscreen/ads7846.c
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Diffstat (limited to 'drivers/input/touchscreen/ads7846.c')
-rw-r--r--drivers/input/touchscreen/ads7846.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/input/touchscreen/ads7846.c b/drivers/input/touchscreen/ads7846.c
index 0f5f968592bd..04edc8f7122f 100644
--- a/drivers/input/touchscreen/ads7846.c
+++ b/drivers/input/touchscreen/ads7846.c
@@ -668,18 +668,22 @@ static int ads7846_no_filter(void *ads, int data_idx, int *val)
static int ads7846_get_value(struct ads7846 *ts, struct spi_message *m)
{
+ int value;
struct spi_transfer *t =
list_entry(m->transfers.prev, struct spi_transfer, transfer_list);
if (ts->model == 7845) {
- return be16_to_cpup((__be16 *)&(((char*)t->rx_buf)[1])) >> 3;
+ value = be16_to_cpup((__be16 *)&(((char *)t->rx_buf)[1]));
} else {
/*
* adjust: on-wire is a must-ignore bit, a BE12 value, then
* padding; built from two 8 bit values written msb-first.
*/
- return be16_to_cpup((__be16 *)t->rx_buf) >> 3;
+ value = be16_to_cpup((__be16 *)t->rx_buf);
}
+
+ /* enforce ADC output is 12 bits width */
+ return (value >> 3) & 0xfff;
}
static void ads7846_update_value(struct spi_message *m, int val)