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a=openpgp; fpr=89EC3D058446217450F22848169AB7B1A4CFF8AE Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org Document the Goodix GT9916 wich is part of the "Berlin" serie of Touchscreen controllers IC from Goodix. Reviewed-by: Rob Herring Signed-off-by: Neil Armstrong --- .../bindings/input/touchscreen/goodix,gt9916.yaml | 95 ++++++++++++++++++++++ 1 file changed, 95 insertions(+) diff --git a/Documentation/devicetree/bindings/input/touchscreen/goodix,gt9916.yaml b/Documentation/devicetree/bindings/input/touchscreen/goodix,gt9916.yaml new file mode 100644 index 000000000000..d90f045ac06c --- /dev/null +++ b/Documentation/devicetree/bindings/input/touchscreen/goodix,gt9916.yaml @@ -0,0 +1,95 @@ +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/input/touchscreen/goodix,gt9916.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Goodix Berlin series touchscreen controller + +description: The Goodix Berlin series of touchscreen controllers + be connected to either I2C or SPI buses. + +maintainers: + - Neil Armstrong + +allOf: + - $ref: touchscreen.yaml# + - $ref: /schemas/spi/spi-peripheral-props.yaml# + +properties: + compatible: + enum: + - goodix,gt9916 + + reg: + maxItems: 1 + + interrupts: + maxItems: 1 + + reset-gpios: + maxItems: 1 + + avdd-supply: + description: Analog power supply regulator on AVDD pin + + vddio-supply: + description: power supply regulator on VDDIO pin + + spi-max-frequency: true + touchscreen-inverted-x: true + touchscreen-inverted-y: true + touchscreen-size-x: true + touchscreen-size-y: true + touchscreen-swapped-x-y: true + +additionalProperties: false + +required: + - compatible + - reg + - interrupts + - avdd-supply + - touchscreen-size-x + - touchscreen-size-y + +examples: + - | + #include + #include + i2c { + #address-cells = <1>; + #size-cells = <0>; + touchscreen@5d { + compatible = "goodix,gt9916"; + reg = <0x5d>; + interrupt-parent = <&gpio>; + interrupts = <25 IRQ_TYPE_LEVEL_LOW>; + reset-gpios = <&gpio1 1 GPIO_ACTIVE_LOW>; + avdd-supply = <&ts_avdd>; + touchscreen-size-x = <1024>; + touchscreen-size-y = <768>; + }; + }; + - | + #include + #include + spi { + #address-cells = <1>; + #size-cells = <0>; + num-cs = <1>; + cs-gpios = <&gpio 2 GPIO_ACTIVE_HIGH>; + touchscreen@0 { + compatible = "goodix,gt9916"; + reg = <0>; + interrupt-parent = <&gpio>; + interrupts = <25 IRQ_TYPE_LEVEL_LOW>; + reset-gpios = <&gpio1 1 GPIO_ACTIVE_LOW>; + avdd-supply = <&ts_avdd>; + spi-max-frequency = <1000000>; + touchscreen-size-x = <1024>; + touchscreen-size-y = <768>; + }; + }; + +... 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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 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 | 173 ++++++++++++++++++++++++++ 3 files changed, 188 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..1f57c3592918 --- /dev/null +++ b/drivers/input/touchscreen/goodix_berlin_spi.c @@ -0,0 +1,173 @@ +// 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); + + 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 ");