diff options
Diffstat (limited to 'drivers/input/touchscreen/ads7846.c')
| -rw-r--r-- | drivers/input/touchscreen/ads7846.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/drivers/input/touchscreen/ads7846.c b/drivers/input/touchscreen/ads7846.c index 607f18af7010..066dc04003fa 100644 --- a/drivers/input/touchscreen/ads7846.c +++ b/drivers/input/touchscreen/ads7846.c @@ -331,7 +331,7 @@ struct ser_req { u8 ref_off; u16 scratch; struct spi_message msg; - struct spi_transfer xfer[6]; + struct spi_transfer xfer[8]; /* * DMA (thus cache coherency maintenance) requires the * transfer buffers to live in their own cache lines. @@ -405,9 +405,19 @@ static int ads7846_read12_ser(struct device *dev, unsigned command) req->xfer[5].rx_buf = &req->scratch; req->xfer[5].len = 2; - CS_CHANGE(req->xfer[5]); spi_message_add_tail(&req->xfer[5], &req->msg); + /* clear the command register */ + req->scratch = 0; + req->xfer[6].tx_buf = &req->scratch; + req->xfer[6].len = 1; + spi_message_add_tail(&req->xfer[6], &req->msg); + + req->xfer[7].rx_buf = &req->scratch; + req->xfer[7].len = 2; + CS_CHANGE(req->xfer[7]); + spi_message_add_tail(&req->xfer[7], &req->msg); + mutex_lock(&ts->lock); ads7846_stop(ts); status = spi_sync(spi, &req->msg); |