From patchwork Wed Feb 7 13:00:37 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Florian Echtler X-Patchwork-Id: 10205137 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 0743260247 for ; Wed, 7 Feb 2018 13:01:10 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E699828F40 for ; Wed, 7 Feb 2018 13:01:09 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id DB33428F74; Wed, 7 Feb 2018 13:01:09 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7B76D28F40 for ; Wed, 7 Feb 2018 13:01:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754049AbeBGNBI (ORCPT ); Wed, 7 Feb 2018 08:01:08 -0500 Received: from butterbrot.org ([176.9.106.16]:44012 "EHLO butterbrot.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754026AbeBGNAo (ORCPT ); Wed, 7 Feb 2018 08:00:44 -0500 Received: from flunder.scc.uni-weimar.de (anna125.medien.uni-weimar.de [141.54.178.119]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) by butterbrot.org (Postfix) with ESMTPSA id 8C22E4AE01F4; Wed, 7 Feb 2018 14:00:43 +0100 (CET) From: Florian Echtler To: hverkuil@xs4all.nl, linux-media@vger.kernel.org Cc: linux-input@vger.kernel.org, modin@yuri.at, Florian Echtler Subject: [PATCH 3/4] add panel register access functions Date: Wed, 7 Feb 2018 14:00:37 +0100 Message-Id: <1518008438-26603-4-git-send-email-floe@butterbrot.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1518008438-26603-1-git-send-email-floe@butterbrot.org> References: <1518008438-26603-1-git-send-email-floe@butterbrot.org> Sender: linux-input-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP These functions provide write access to the internal LCD panel registers which also control the sensor. They can be used to disable the preprocessor, set the illumination brightness, and adjust gain/contrast (which are stored together in one register internally called "vsvideo"). Signed-off-by: Florian Echtler --- drivers/input/touchscreen/sur40.c | 75 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 75 insertions(+) diff --git a/drivers/input/touchscreen/sur40.c b/drivers/input/touchscreen/sur40.c index 8a5b031..d6fa25e 100644 --- a/drivers/input/touchscreen/sur40.c +++ b/drivers/input/touchscreen/sur40.c @@ -251,6 +251,81 @@ static int sur40_command(struct sur40_state *dev, 0x00, index, buffer, size, 1000); } +/* poke a byte in the panel register space */ +static int sur40_poke(struct sur40_state *dev, u8 offset, u8 value) +{ + int result; + u8 index = 0x96; // 0xae for permanent write + + result = usb_control_msg(dev->usbdev, usb_sndctrlpipe(dev->usbdev, 0), + SUR40_POKE, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT, + 0x32, index, NULL, 0, 1000); + if (result < 0) + goto error; + msleep(5); + + result = usb_control_msg(dev->usbdev, usb_sndctrlpipe(dev->usbdev, 0), + SUR40_POKE, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT, + 0x72, offset, NULL, 0, 1000); + if (result < 0) + goto error; + msleep(5); + + result = usb_control_msg(dev->usbdev, usb_sndctrlpipe(dev->usbdev, 0), + SUR40_POKE, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT, + 0xb2, value, NULL, 0, 1000); + if (result < 0) + goto error; + msleep(5); + +error: + return result; +} + +static int sur40_set_preprocessor(struct sur40_state *dev, u8 value) +{ + u8 setting_07[2] = { 0x01, 0x00 }; + u8 setting_17[2] = { 0x85, 0x80 }; + int result; + + if (value > 1) + return -ERANGE; + + result = usb_control_msg(dev->usbdev, usb_sndctrlpipe(dev->usbdev, 0), + SUR40_POKE, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT, + 0x07, setting_07[value], NULL, 0, 1000); + if (result < 0) + goto error; + msleep(5); + + result = usb_control_msg(dev->usbdev, usb_sndctrlpipe(dev->usbdev, 0), + SUR40_POKE, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT, + 0x17, setting_17[value], NULL, 0, 1000); + if (result < 0) + goto error; + msleep(5); + +error: + return result; +} + +static void sur40_set_vsvideo(struct sur40_state *handle, u8 value) +{ + int i; + + for (i = 0; i < 4; i++) + sur40_poke(handle, 0x1c+i, value); + handle->vsvideo = value; +} + +static void sur40_set_irlevel(struct sur40_state *handle, u8 value) +{ + int i; + + for (i = 0; i < 8; i++) + sur40_poke(handle, 0x08+(2*i), value); +} + /* Initialization routine, called from sur40_open */ static int sur40_init(struct sur40_state *dev) {