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Input: ar1021_i2c - enable touch mode during open

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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 <martin.kepplinger@ginzinger.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Martin Kepplinger 2017-04-28 09:58:12 -07:00 committed by Dmitry Torokhov
parent aea415b1d1
commit e55057e82a
1 changed files with 15 additions and 0 deletions
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15
drivers/input/touchscreen/ar1021_i2c.c
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@ -18,6 +18,10 @@
#define AR1021_MAX_X 4095
#define AR1021_MAX_Y 4095
#define AR1021_CMD 0x55
#define AR1021_CMD_ENABLE_TOUCH 0x12
struct ar1021_i2c {
struct i2c_client *client;
struct input_dev *input;
@ -56,8 +60,19 @@ out:
static int ar1021_i2c_open(struct input_dev *dev)
{
static const u8 cmd_enable_touch[] = {
AR1021_CMD,
0x01, /* number of bytes after this */
AR1021_CMD_ENABLE_TOUCH
};
struct ar1021_i2c *ar1021 = input_get_drvdata(dev);
struct i2c_client *client = ar1021->client;
int error;
error = i2c_master_send(ar1021->client, cmd_enable_touch,
sizeof(cmd_enable_touch));
if (error < 0)
return error;
enable_irq(client->irq);