From 78562296535bbd78d75664ca6e51680a48eec677 Mon Sep 17 00:00:00 2001 From: Haibo Chen Date: Thu, 3 Aug 2017 17:02:42 +0800 Subject: [PATCH] MLK-15950 input: egalax_ts: switch to i2c interface before wake up MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit For HannStar (HSD100PXN1 Rev: 1-A00C11 F/W:0634) LVDS touch screen, it has a special request for the EETI touch controller. The host needs to trigger I2C event to device FW at booting first, and then the FW can switch to I2C interface. Otherwise, the FW can’t work with I2C interface, and can't generate any interrupt when touch the screen. This patch send an I2C command before the device wake up, make sure the device switch to I2C interface first. Signed-off-by: Haibo Chen Reviewed-by: Andy Duan --- drivers/input/touchscreen/egalax_ts.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/drivers/input/touchscreen/egalax_ts.c b/drivers/input/touchscreen/egalax_ts.c index 1afc08b08155..d5f41cbb599e 100644 --- a/drivers/input/touchscreen/egalax_ts.c +++ b/drivers/input/touchscreen/egalax_ts.c @@ -186,6 +186,20 @@ static int egalax_ts_probe(struct i2c_client *client, ts->client = client; ts->input_dev = input_dev; + /* HannStar (HSD100PXN1 Rev: 1-A00C11 F/W:0634) LVDS touch + * screen needs to trigger I2C event to device FW at booting + * first, and then the FW can switch to I2C interface. + * Otherwise, the FW can’t work with I2C interface. So here + * just use the exist function egalax_firmware_version() to + * send a I2C command to the device, make sure the device FW + * switch to I2C interface. + */ + error = egalax_firmware_version(client); + if (error) { + dev_err(&client->dev, "Failed to switch to I2C interface\n"); + return error; + } + /* controller may be in sleep, wake it up. */ error = egalax_wake_up_device(client); if (error) { -- 2.17.1