From c789f1fb07e7c5acc04342cb2e2412aa71cd6c18 Mon Sep 17 00:00:00 2001 From: Franklin S Cooper Jr Date: Fri, 16 Oct 2015 15:34:05 -0700 Subject: [PATCH] Input: edt-ft5x06 - use max support points to determine how much to read Calculate the amount of data that needs to be read for the specified max number of support points. If the maximum number of support points changes then the amount that is read from the touch screen controller should reflect this. Signed-off-by: Franklin S Cooper Jr Signed-off-by: Dmitry Torokhov --- drivers/input/touchscreen/edt-ft5x06.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/input/touchscreen/edt-ft5x06.c b/drivers/input/touchscreen/edt-ft5x06.c index a8640c7b6713..a76bc486936c 100644 --- a/drivers/input/touchscreen/edt-ft5x06.c +++ b/drivers/input/touchscreen/edt-ft5x06.c @@ -168,9 +168,9 @@ static irqreturn_t edt_ft5x06_ts_isr(int irq, void *dev_id) struct edt_ft5x06_ts_data *tsdata = dev_id; struct device *dev = &tsdata->client->dev; u8 cmd; - u8 rdbuf[29]; + u8 rdbuf[31]; int i, type, x, y, id; - int offset, tplen, datalen; + int offset, tplen, datalen, crclen; int error; switch (tsdata->version) { @@ -178,14 +178,14 @@ static irqreturn_t edt_ft5x06_ts_isr(int irq, void *dev_id) cmd = 0xf9; /* tell the controller to send touch data */ offset = 5; /* where the actual touch data starts */ tplen = 4; /* data comes in so called frames */ - datalen = 26; /* how much bytes to listen for */ + crclen = 1; /* length of the crc data */ break; case M09: cmd = 0x02; offset = 1; tplen = 6; - datalen = 29; + crclen = 0; break; default: @@ -193,6 +193,7 @@ static irqreturn_t edt_ft5x06_ts_isr(int irq, void *dev_id) } memset(rdbuf, 0, sizeof(rdbuf)); + datalen = tplen * MAX_SUPPORT_POINTS + offset + crclen; error = edt_ft5x06_ts_readwrite(tsdata->client, sizeof(cmd), &cmd, -- 2.20.1