From patchwork Wed Dec 13 17:13:18 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Neil Armstrong X-Patchwork-Id: 754090 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="hX6BtFlN" Received: from mail-wm1-x32b.google.com (mail-wm1-x32b.google.com [IPv6:2a00:1450:4864:20::32b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8213D111 for ; Wed, 13 Dec 2023 09:13:26 -0800 (PST) Received: by mail-wm1-x32b.google.com with SMTP id 5b1f17b1804b1-40c48d7a7a7so30725015e9.3 for ; Wed, 13 Dec 2023 09:13:26 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1702487605; x=1703092405; darn=vger.kernel.org; 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=OxnVNSfczT25XAfpC4X+ICgFqABO9v8W+zLZSFvXeiM=; b=hX6BtFlNsUUCBB0i8bCvZMu4X7wMObrGy9LdpvXrch8K0+YJNanC7FLiKCczDgumh9 hGL8BWCtWR5+RU9E4Bn4A+ElaHl0OnJxG+kqPtQpZLQpt7nroEQDUWP/Eid0He+ViV3W EcO19EHBaJngHQMq+mIGN5wYfSamAtxQh2xSeZR9JxB97Oi4RSR5O/KRAdwyNDRF+a81 OHOQl929bB/TtzHHYubfEd0T7ekbiLxLop2mGZvH/Xz+Od1lkLHt4tyevk1+2ftIw0IV sI6zyWrGLLtphO0ew8CepCVFH/vaCSjaySWuPt7oBatdHwrmAIKegQ9HG4gXWb2matn4 bRng== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1702487605; x=1703092405; 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=OxnVNSfczT25XAfpC4X+ICgFqABO9v8W+zLZSFvXeiM=; b=VjvfqK3IVeWrEQUjJsnF0asItf8fGMVf+HmZ2JOt3WUaGy/utFy3c8KHYgaHjovCGr axWN8SIFlvtD4CjH4hbjctnq/YqJfjMnS4z7EGfWt8MyIkaegIeGoD75YzJnUsYIoZHz 2JBBBEZeb8QFCnpeBQ5T1wxiwjhnVJJI30FVcrT5JmfM6hk87qAIVxcS6fNIaefda/+/ R70keuW8dZGrDHpJTrpMmENsIVV2akUX242Kdp+rT8o3ed010Sm7Y1PK57ptGdnS13F+ J6KQFU+d7jFjgPGanSK45+g6DetdYp9fJ5CTgxps0CLYmgKc/tKPtR/E5XK0BL3GaLUW MqzQ== X-Gm-Message-State: AOJu0YxJc3FX64UM1bDD85QS81bmP8tHKmyYKQodzK4P9Msd4u6l/qXq wBoJ1+t6XTjp3+H0hic4y7h32w== X-Google-Smtp-Source: AGHT+IH1Dl/k4FwHknd8WNNERXzxdIk6D8+u0zwliSjifrDoKxzr6a7uVHIVoXTJdh3ZToafzMMAog== X-Received: by 2002:a7b:cb95:0:b0:40c:1946:be03 with SMTP id m21-20020a7bcb95000000b0040c1946be03mr4836755wmi.111.1702487604922; Wed, 13 Dec 2023 09:13:24 -0800 (PST) Received: from arrakeen.starnux.net ([2a01:e0a:982:cbb0:52eb:f6ff:feb3:451a]) by smtp.gmail.com with ESMTPSA id fs27-20020a05600c3f9b00b0040b36050f1bsm20711039wmb.44.2023.12.13.09.13.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 13 Dec 2023 09:13:24 -0800 (PST) From: Neil Armstrong Date: Wed, 13 Dec 2023 18:13:18 +0100 Subject: [PATCH v13 4/4] Input: goodix-berlin - add SPI support for Goodix Berlin Touchscreen IC Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20231213-topic-goodix-berlin-upstream-initial-v13-4-5d7a26a5eaa2@linaro.org> References: <20231213-topic-goodix-berlin-upstream-initial-v13-0-5d7a26a5eaa2@linaro.org> In-Reply-To: <20231213-topic-goodix-berlin-upstream-initial-v13-0-5d7a26a5eaa2@linaro.org> To: Dmitry Torokhov , linux-input@vger.kernel.org Cc: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Bastien Nocera , Hans de Goede , Henrik Rydberg , Jeff LaBundy , linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Neil Armstrong X-Mailer: b4 0.12.4 X-Developer-Signature: v=1; a=openpgp-sha256; l=8067; i=neil.armstrong@linaro.org; h=from:subject:message-id; bh=IRI86qOlgcP+lY+pewvMbMLCeQCDU17m1zaFOv0kod4=; b=owEBbQKS/ZANAwAKAXfc29rIyEnRAcsmYgBleeYvm2BQ9H2qKM6nS0xv74oPM4C33GxAOi+ExNtj 8mdRKHmJAjMEAAEKAB0WIQQ9U8YmyFYF/h30LIt33NvayMhJ0QUCZXnmLwAKCRB33NvayMhJ0fTZD/ 0ZG9+BCUZUOLEafoYDv3lf0SVGpWUHaYlnxTJlOEhinj8XyDpYjKo+Ip+GtDYL9/JSQfZNjBjwcK8A lcFFgyJNT87qoO3YlvdK/w1WCkbr2IWV8N4oAnoBqyujlKIhabzvbsSjG12SLdYzZg56KDQofxPmHn KQyPCd+ZpKoR/zVBwTrW747Y+F9S8iVuKbWPVddiiuSSqsigiooH8v9sTiJweXdocBgQ7IjKf6Z4Pg ospue5EQSVHUWp1AgyPFJadiA5inG+iRY3rcJRHiecmP2v1YB8aY7iEjS1bR6FUWEX91x+zMBoAhf4 n0dQ4eU969a1cPRjJawnGsFifxGJioSQ4kgVf2ZSsdJ1gn5s5XhX31ZIfT3R3/CkjqjxK3v8Fasxlx I2gOjwudIIGQlOK6Oc3pvj1+7tUwX+muVudZfWnpynnsWzEt84/B+iBN7N9eYegSNjmheJ3/iWgE1X 5yEQCy2CdXEcIpFQ9+2on5L3Ch9aMFs2Mes0nnZY75B0rImaaSFmKuCuXLR/8iPZiL8BePgtixTQfR 7XYVWqrMqoHaEKaI9TEEtcDchbRivuqum7vennT/x1k1Vrp0djzU3oRl/WAm5JfpeF64XZdA+lXS/r +htNOaIUoxo9aOb6aSItt1vzq5e5cjKtpqmELzcB0CrZp6blI3YuQ4W8VVwg== X-Developer-Key: i=neil.armstrong@linaro.org; a=openpgp; fpr=89EC3D058446217450F22848169AB7B1A4CFF8AE 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 Reviewed-by: Jeff LaBundy Signed-off-by: Neil Armstrong --- drivers/input/touchscreen/Kconfig | 14 ++ drivers/input/touchscreen/Makefile | 1 + drivers/input/touchscreen/goodix_berlin_spi.c | 177 ++++++++++++++++++++++++++ 3 files changed, 192 insertions(+) diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig index cc7b88118158..c821fe3ee794 100644 --- a/drivers/input/touchscreen/Kconfig +++ b/drivers/input/touchscreen/Kconfig @@ -433,6 +433,20 @@ 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 REGMAP + 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 7ef677cf7a10..a81cb5aa21a5 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..502b143e9e05 --- /dev/null +++ b/drivers/input/touchscreen/goodix_berlin_spi.c @@ -0,0 +1,177 @@ +// 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 GOODIX_BERLIN_SPI_TRANS_PREFIX_LEN 1 +#define GOODIX_BERLIN_REGISTER_WIDTH 4 +#define GOODIX_BERLIN_SPI_READ_DUMMY_LEN 3 +#define GOODIX_BERLIN_SPI_READ_PREFIX_LEN (GOODIX_BERLIN_SPI_TRANS_PREFIX_LEN + \ + GOODIX_BERLIN_REGISTER_WIDTH + \ + GOODIX_BERLIN_SPI_READ_DUMMY_LEN) +#define GOODIX_BERLIN_SPI_WRITE_PREFIX_LEN (GOODIX_BERLIN_SPI_TRANS_PREFIX_LEN + \ + GOODIX_BERLIN_REGISTER_WIDTH) + +#define GOODIX_BERLIN_SPI_WRITE_FLAG 0xF0 +#define GOODIX_BERLIN_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 error; + + if (reg_size != GOODIX_BERLIN_REGISTER_WIDTH) + return -EINVAL; + + buf = kzalloc(GOODIX_BERLIN_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] = GOODIX_BERLIN_SPI_READ_FLAG; + put_unaligned_be32(*reg, buf + GOODIX_BERLIN_SPI_TRANS_PREFIX_LEN); + memset(buf + GOODIX_BERLIN_SPI_TRANS_PREFIX_LEN + GOODIX_BERLIN_REGISTER_WIDTH, + 0xff, GOODIX_BERLIN_SPI_READ_DUMMY_LEN); + + xfers.tx_buf = buf; + xfers.rx_buf = buf; + xfers.len = GOODIX_BERLIN_SPI_READ_PREFIX_LEN + val_size; + xfers.cs_change = 0; + spi_message_add_tail(&xfers, &spi_msg); + + error = spi_sync(spi, &spi_msg); + if (error < 0) + dev_err(&spi->dev, "spi transfer error, %d", error); + else + memcpy(val_buf, buf + GOODIX_BERLIN_SPI_READ_PREFIX_LEN, val_size); + + kfree(buf); + return error; +} + +static int goodix_berlin_spi_write(void *context, const void *data, + size_t count) +{ + unsigned int len = count - GOODIX_BERLIN_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 error; + + buf = kzalloc(GOODIX_BERLIN_SPI_WRITE_PREFIX_LEN + len, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + spi_message_init(&spi_msg); + memset(&xfers, 0, sizeof(xfers)); + + buf[0] = GOODIX_BERLIN_SPI_WRITE_FLAG; + put_unaligned_be32(*reg, buf + GOODIX_BERLIN_SPI_TRANS_PREFIX_LEN); + memcpy(buf + GOODIX_BERLIN_SPI_WRITE_PREFIX_LEN, + data + GOODIX_BERLIN_REGISTER_WIDTH, len); + + xfers.tx_buf = buf; + xfers.len = GOODIX_BERLIN_SPI_WRITE_PREFIX_LEN + len; + xfers.cs_change = 0; + spi_message_add_tail(&xfers, &spi_msg); + + error = spi_sync(spi, &spi_msg); + if (error < 0) + dev_err(&spi->dev, "spi transfer error, %d", error); + + kfree(buf); + return error; +} + +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; + + 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 = goodix_berlin_spi_regmap_conf; + regmap_config.max_raw_read = max_size - GOODIX_BERLIN_SPI_READ_PREFIX_LEN; + regmap_config.max_raw_write = max_size - GOODIX_BERLIN_SPI_WRITE_PREFIX_LEN; + + regmap = devm_regmap_init(&spi->dev, NULL, spi, ®map_config); + if (IS_ERR(regmap)) + return PTR_ERR(regmap); + + error = goodix_berlin_probe(&spi->dev, spi->irq, + &goodix_berlin_spi_input_id, regmap); + if (error) + return error; + + return 0; +} + +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 ");