On Thu, Apr 27, 2017 at 02:22:35PM +0200, Martin Kepplinger wrote: > The device could as well be in command mode, in which this driver cannot > handle the device. When opening the device, let's make sure the device > will be in the mode we expect it to be for this driver. > > Signed-off-by: Martin Kepplinger <[email protected]> > --- > drivers/input/touchscreen/ar1021_i2c.c | 15 +++++++++++++++ > 1 file changed, 15 insertions(+) > > diff --git a/drivers/input/touchscreen/ar1021_i2c.c > b/drivers/input/touchscreen/ar1021_i2c.c > index 1a94d8b..2a76231 100644 > --- a/drivers/input/touchscreen/ar1021_i2c.c > +++ b/drivers/input/touchscreen/ar1021_i2c.c > @@ -18,6 +18,12 @@ > #define AR1021_MAX_X 4095 > #define AR1021_MAX_Y 4095 > > +#define AR1021_CMD 0x55 > +#define AR1021_TOUCH 0x80 > + > +#define AR1021_CMD_ENABLE_TOUCH 0x12 > +#define AR1021_CMD_DISABLE_TOUCH 0x13 > + > struct ar1021_i2c { > struct i2c_client *client; > struct input_dev *input; > @@ -58,6 +64,15 @@ static int ar1021_i2c_open(struct input_dev *dev) > { > struct ar1021_i2c *ar1021 = input_get_drvdata(dev); > struct i2c_client *client = ar1021->client; > + int error; > + u8 cmd_enable_touch[3] = {AR1021_CMD, > + 0x01, /* number of bytes after this */ > + AR1021_CMD_ENABLE_TOUCH };
Changed to static const and applied, thank you. > + > + error = i2c_master_send(ar1021->client, cmd_enable_touch, > + sizeof(cmd_enable_touch)); > + if (error < 0) > + return error; > > enable_irq(client->irq); > > -- > 2.1.4 > -- Dmitry
