From e55057e82ad413603fd45eac3b83b80acde780e1 Mon Sep 17 00:00:00 2001 From: Martin Kepplinger Date: Fri, 28 Apr 2017 09:58:12 -0700 Subject: [PATCH] Input: ar1021_i2c - enable touch mode during open 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 Signed-off-by: Dmitry Torokhov --- 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..21c74ee 100644 --- a/drivers/input/touchscreen/ar1021_i2c.c +++ b/drivers/input/touchscreen/ar1021_i2c.c @@ -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); -- 2.7.4