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Hi Dmitry,
Can you help review these two patches?
Haibo Chen
> -----Original Message-----
> From: haibo.chen@xxxxxxx <haibo.chen@xxxxxxx>
> Sent: 2020年2月11日 16:41
> To: dmitry.torokhov@xxxxxxxxx; linux-input@xxxxxxxxxxxxxxx
> Cc: BOUGH CHEN <haibo.chen@xxxxxxx>; dl-linux-imx
> <linux-imx@xxxxxxx>
> Subject: [PATCH 1/2] input: egalax_ts: switch to i2c interface before wake up
>
> From: Haibo Chen <haibo.chen@xxxxxxx>
>
> 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 <haibo.chen@xxxxxxx>
> ---
> 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 83ac8c128192..5e35ca5edc7b 100644
> --- a/drivers/input/touchscreen/egalax_ts.c
> +++ b/drivers/input/touchscreen/egalax_ts.c
> @@ -183,6 +183,20 @@ 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
