From patchwork Thu Jun 15 10:27:03 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Neil Armstrong X-Patchwork-Id: 13281038 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D2FC7C0015E for ; Thu, 15 Jun 2023 10:27:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239201AbjFOK1W (ORCPT ); Thu, 15 Jun 2023 06:27:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39254 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S245461AbjFOK1T (ORCPT ); Thu, 15 Jun 2023 06:27:19 -0400 Received: from mail-lj1-x22c.google.com (mail-lj1-x22c.google.com [IPv6:2a00:1450:4864:20::22c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EA404212A for ; Thu, 15 Jun 2023 03:27:14 -0700 (PDT) Received: by mail-lj1-x22c.google.com with SMTP id 38308e7fff4ca-2b4420a8c44so10723381fa.2 for ; Thu, 15 Jun 2023 03:27:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1686824833; x=1689416833; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=8ybjd+QrBvVu0zDRNg4Z7l4eXFNbVwdU/ccLoGQD+UU=; b=PraZBEsIv2ndh/VAfL+yzPSyodzZU5F33StuNRdOgWmWp3EphYnK9qGr1dvTjWQ4IC BzWYedH9lh7/+chaOuIAgcjv7eJmq6TKd/0t1Ya7x3VcZEz4kIilSGyMDqbSGnLfUCNl geVY9VyJDKHgIm6aLiwM3JLiCH6x+L6FBIduuN0krgUTCn9MwFeEyPb2CxOrNXs41ZkF l5fPdeF1dU3rYZ1bJFvUI1OlHdmVqfrdcy9sifcJp9MAEUBSaFp8pu+dYFNlLFG85vgz yfejVkjZKJSPiOtB8vhVGpsi/KCcyxnhs4DMLafCVftBfqBaak5TIUpa+ip4MkbUA3ec AvqQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1686824833; x=1689416833; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=8ybjd+QrBvVu0zDRNg4Z7l4eXFNbVwdU/ccLoGQD+UU=; b=HS4ebP4EZXhtiLcupnPQP9cRj6RCgJ8zSvuqts6LM0FGFFSjLivCTiW9FrTMkwjuNT iMCH5GhY8/fm2KmcD5rLLyaEFgrJNpa3NYUOv4QqGiypJUQVcYU1WOBTz/5g4Fj1013f vhLnOh3iN6e3iIRU1UnF/QJnHR/49uEvbxMzUgmMlAGWKWTHisa9/QXuKybDSTD9z7ne UQ4k/WmvvReUz1KRxafQPj1tCoxMbBU4eLtW1suwroNWOa1RBH4Y35lQNmlEaxilCgt2 L0Rw8LlOCm+TgBFrMQBx0Urd6TFL+4f365I4JFQJt55BKVx6GvTd1tF1ZrPAHLcALqKJ ey+g== X-Gm-Message-State: AC+VfDxfaT+vTfxthH317sBEXdzCcNhAB110I5EBFfQIS1uVdTXFvG/F egBCvA5/GEGxr1cnMtF6grX72A== X-Google-Smtp-Source: ACHHUZ7qeAJcv5BFQS0XYgCKkX1aZG4grPmZB98hbmT/omgQXZSZ6UKCcP8FIakHdb897dKAHzTH7A== X-Received: by 2002:a19:6d1c:0:b0:4f6:424c:4fa8 with SMTP id i28-20020a196d1c000000b004f6424c4fa8mr8736851lfc.17.1686824833128; Thu, 15 Jun 2023 03:27:13 -0700 (PDT) Received: from arrakeen.starnux.net ([2a01:e0a:982:cbb0:8261:5fff:fe11:bdda]) by smtp.gmail.com with ESMTPSA id u5-20020a5d5145000000b0030fa57d8064sm17332337wrt.52.2023.06.15.03.27.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 15 Jun 2023 03:27:12 -0700 (PDT) From: Neil Armstrong Date: Thu, 15 Jun 2023 12:27:03 +0200 Subject: [PATCH v2 4/4] input: touchscreen: add SPI support for Goodix Berlin Touchscreen IC MIME-Version: 1.0 Message-Id: <20230606-topic-goodix-berlin-upstream-initial-v2-4-26bc8fe1e90e@linaro.org> References: <20230606-topic-goodix-berlin-upstream-initial-v2-0-26bc8fe1e90e@linaro.org> In-Reply-To: <20230606-topic-goodix-berlin-upstream-initial-v2-0-26bc8fe1e90e@linaro.org> To: Dmitry Torokhov , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Bastien Nocera , Hans de Goede , Henrik Rydberg Cc: linux-input@vger.kernel.org, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Neil Armstrong X-Mailer: b4 0.12.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=7579; i=neil.armstrong@linaro.org; h=from:subject:message-id; bh=M9Fcb2iZK373bguA+9fk5ubbR87iAMaN2qDGauqltKw=; b=owEBbQKS/ZANAwAKAXfc29rIyEnRAcsmYgBkiud7lyWVyYJVEyeKyBFPvd4pUOtGXU32o0vVILXx CgV0G/SJAjMEAAEKAB0WIQQ9U8YmyFYF/h30LIt33NvayMhJ0QUCZIrnewAKCRB33NvayMhJ0VnqD/ 9N6ChGooUY0+tNEH3tDsGm0iuu3pzYn7ALlfW9ygFkWfNhl1GI5v/es5iRy/HjRTE5k9207MGdMXvQ VIHCZsAcqVp9kJRbQ6SIkZKiteXEeLb0XUurCsmb4ZScyh0P/aqX1qi1z/5YJ6NlPMPNDmZRMpmLzo YTjAt+f448wWBI9pXyCJWwvF1Mk99RvFqyye8vVj1MTZfxhWXD6iXyyWU/NS3jOvYgqaPS1yr5gvhG eutzpyV+wJQmONmmNTamT98UDDtAfCFAfyq5YV/QA80dAaEYI0WQjZwW8S6QnGxNzRDztsGgR5+4o6 GwzDORj3iH4RrYB6YMi0GRr4HK2bKVIbRjCF/uYsyIEetQkDeBkUBkqi7DwPWbnkSHXyvSb/+MLU0v TuYttB1MxarlqLKNefEMFKZscRZLBi2d+cVLQhG/n5lBLtysESisb4kToVZQOdPDzfWiBLLoU15tuU 06ImYR5/G+Q5zLaGTeg3yemGonCe5uvJv22EkicmroXIOBn61fFnwGJCSPMgRfzjnEi65HX3dPY/ty /VZ2CbR8vCiBrHLZ4kYERY0OGKhvpR+2DfdMzTc/l0VStbiX36G40DSFSBMn33WlGcp6GwG4+DANm2 v9ENovCUeZJ4820MrvOeLlELF6CbzVNaCcUSAo3mnSwumGnBuHPCnaBexxag== X-Developer-Key: i=neil.armstrong@linaro.org; a=openpgp; fpr=89EC3D058446217450F22848169AB7B1A4CFF8AE Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org Add initial support for the new Goodix "Berlin" touchscreen ICs over the SPI interface. The driver doesn't use the regmap_spi code since the SPI messages needs to be prefixed, thus this custom regmap code. This initial driver is derived from the Goodix goodix_ts_berlin available at [1] and [2] and only supports the GT9916 IC present on the Qualcomm SM8550 MTP & QRD touch panel. The current implementation only supports BerlinD, aka GT9916. [1] https://github.com/goodix/goodix_ts_berlin [2] https://git.codelinaro.org/clo/la/platform/vendor/opensource/touch-drivers Signed-off-by: Neil Armstrong --- drivers/input/touchscreen/Kconfig | 13 ++ drivers/input/touchscreen/Makefile | 1 + drivers/input/touchscreen/goodix_berlin_spi.c | 172 ++++++++++++++++++++++++++ 3 files changed, 186 insertions(+) diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig index 5e21cca6025d..2d86615e5090 100644 --- a/drivers/input/touchscreen/Kconfig +++ b/drivers/input/touchscreen/Kconfig @@ -435,6 +435,19 @@ config TOUCHSCREEN_GOODIX_BERLIN_I2C To compile this driver as a module, choose M here: the module will be called goodix_berlin_i2c. +config TOUCHSCREEN_GOODIX_BERLIN_SPI + tristate "Goodix Berlin SPI touchscreen" + depends on SPI_MASTER + select TOUCHSCREEN_GOODIX_BERLIN_CORE + help + Say Y here if you have a Goodix Berlin IC connected to + your system via SPI. + + If unsure, say N. + + To compile this driver as a module, choose M here: the + module will be called goodix_berlin_spi. + config TOUCHSCREEN_HIDEEP tristate "HiDeep Touch IC" depends on I2C diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile index 921a2da0c2be..29524e8a83db 100644 --- a/drivers/input/touchscreen/Makefile +++ b/drivers/input/touchscreen/Makefile @@ -49,6 +49,7 @@ obj-$(CONFIG_TOUCHSCREEN_FUJITSU) += fujitsu_ts.o obj-$(CONFIG_TOUCHSCREEN_GOODIX) += goodix_ts.o obj-$(CONFIG_TOUCHSCREEN_GOODIX_BERLIN_CORE) += goodix_berlin_core.o obj-$(CONFIG_TOUCHSCREEN_GOODIX_BERLIN_I2C) += goodix_berlin_i2c.o +obj-$(CONFIG_TOUCHSCREEN_GOODIX_BERLIN_SPI) += goodix_berlin_spi.o obj-$(CONFIG_TOUCHSCREEN_HIDEEP) += hideep.o obj-$(CONFIG_TOUCHSCREEN_HYNITRON_CSTXXX) += hynitron_cstxxx.o obj-$(CONFIG_TOUCHSCREEN_ILI210X) += ili210x.o diff --git a/drivers/input/touchscreen/goodix_berlin_spi.c b/drivers/input/touchscreen/goodix_berlin_spi.c new file mode 100644 index 000000000000..3a1bc251b32d --- /dev/null +++ b/drivers/input/touchscreen/goodix_berlin_spi.c @@ -0,0 +1,172 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Goodix Berlin Touchscreen Driver + * + * Copyright (C) 2020 - 2021 Goodix, Inc. + * Copyright (C) 2023 Linaro Ltd. + * + * Based on goodix_ts_berlin driver. + */ +#include +#include +#include +#include +#include + +#include "goodix_berlin.h" + +#define SPI_TRANS_PREFIX_LEN 1 +#define REGISTER_WIDTH 4 +#define SPI_READ_DUMMY_LEN 3 +#define SPI_READ_PREFIX_LEN (SPI_TRANS_PREFIX_LEN + REGISTER_WIDTH + SPI_READ_DUMMY_LEN) +#define SPI_WRITE_PREFIX_LEN (SPI_TRANS_PREFIX_LEN + REGISTER_WIDTH) + +#define SPI_WRITE_FLAG 0xF0 +#define SPI_READ_FLAG 0xF1 + +static int goodix_berlin_spi_read(void *context, const void *reg_buf, + size_t reg_size, void *val_buf, + size_t val_size) +{ + struct spi_device *spi = context; + struct spi_transfer xfers; + struct spi_message spi_msg; + const u32 *reg = reg_buf; /* reg is stored as native u32 at start of buffer */ + u8 *buf; + int ret; + + if (reg_size != REGISTER_WIDTH) + return -EINVAL; + + buf = kzalloc(SPI_READ_PREFIX_LEN + val_size, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + spi_message_init(&spi_msg); + memset(&xfers, 0, sizeof(xfers)); + + /* buffer format: 0xF1 + addr(4bytes) + dummy(3bytes) + data */ + buf[0] = SPI_READ_FLAG; + put_unaligned_be32(*reg, buf + SPI_TRANS_PREFIX_LEN); + memset(buf + SPI_TRANS_PREFIX_LEN + REGISTER_WIDTH, 0xff, + SPI_READ_DUMMY_LEN); + + xfers.tx_buf = buf; + xfers.rx_buf = buf; + xfers.len = SPI_READ_PREFIX_LEN + val_size; + xfers.cs_change = 0; + spi_message_add_tail(&xfers, &spi_msg); + + ret = spi_sync(spi, &spi_msg); + if (ret < 0) + dev_err(&spi->dev, "transfer error:%d", ret); + else + memcpy(val_buf, buf + SPI_READ_PREFIX_LEN, val_size); + + kfree(buf); + return ret; +} + +static int goodix_berlin_spi_write(void *context, const void *data, + size_t count) +{ + unsigned int len = count - REGISTER_WIDTH; + struct spi_device *spi = context; + struct spi_transfer xfers; + struct spi_message spi_msg; + const u32 *reg = data; /* reg is stored as native u32 at start of buffer */ + u8 *buf; + int ret; + + buf = kzalloc(SPI_WRITE_PREFIX_LEN + len, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + spi_message_init(&spi_msg); + memset(&xfers, 0, sizeof(xfers)); + + buf[0] = SPI_WRITE_FLAG; + put_unaligned_be32(*reg, buf + SPI_TRANS_PREFIX_LEN); + memcpy(buf + SPI_WRITE_PREFIX_LEN, data + REGISTER_WIDTH, len); + + xfers.tx_buf = buf; + xfers.len = SPI_WRITE_PREFIX_LEN + len; + xfers.cs_change = 0; + spi_message_add_tail(&xfers, &spi_msg); + + ret = spi_sync(spi, &spi_msg); + if (ret < 0) + dev_err(&spi->dev, "transfer error:%d", ret); + + kfree(buf); + return ret; +} + +static const struct regmap_config goodix_berlin_spi_regmap_conf = { + .reg_bits = 32, + .val_bits = 8, + .read = goodix_berlin_spi_read, + .write = goodix_berlin_spi_write, +}; + +/* vendor & product left unassigned here, should probably be updated from fw info */ +static const struct input_id goodix_berlin_spi_input_id = { + .bustype = BUS_SPI, +}; + +static int goodix_berlin_spi_probe(struct spi_device *spi) +{ + struct regmap_config *regmap_config; + struct regmap *regmap; + size_t max_size; + int error = 0; + + regmap_config = devm_kmemdup(&spi->dev, &goodix_berlin_spi_regmap_conf, + sizeof(*regmap_config), GFP_KERNEL); + if (!regmap_config) + return -ENOMEM; + + spi->mode = SPI_MODE_0; + spi->bits_per_word = 8; + error = spi_setup(spi); + if (error) + return error; + + max_size = spi_max_transfer_size(spi); + regmap_config->max_raw_read = max_size - SPI_READ_PREFIX_LEN; + regmap_config->max_raw_write = max_size - SPI_WRITE_PREFIX_LEN; + + regmap = devm_regmap_init(&spi->dev, NULL, spi, regmap_config); + if (IS_ERR(regmap)) + return PTR_ERR(regmap); + + return goodix_berlin_probe(&spi->dev, spi->irq, + &goodix_berlin_spi_input_id, regmap); +} + +static const struct spi_device_id goodix_berlin_spi_ids[] = { + { "gt9916" }, + { }, +}; +MODULE_DEVICE_TABLE(spi, goodix_berlin_spi_ids); + +static const struct of_device_id goodix_berlin_spi_of_match[] = { + { .compatible = "goodix,gt9916", }, + { } +}; +MODULE_DEVICE_TABLE(of, goodix_berlin_spi_of_match); + +static struct spi_driver goodix_berlin_spi_driver = { + .driver = { + .name = "goodix-berlin-spi", + .of_match_table = goodix_berlin_spi_of_match, + .pm = pm_sleep_ptr(&goodix_berlin_pm_ops), + }, + .probe = goodix_berlin_spi_probe, + .id_table = goodix_berlin_spi_ids, +}; +module_spi_driver(goodix_berlin_spi_driver); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Goodix Berlin SPI Touchscreen driver"); +MODULE_AUTHOR("Neil Armstrong ");