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Message-ID: <edb4c8f2-afef-4892-914f-33bd5b25301a@linaro.org>
Date: Fri, 7 Mar 2025 11:03:10 +0100
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Jens Reidel <adrian@...nlining.org>,
Dmitry Torokhov <dmitry.torokhov@...il.com>, Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
<conor+dt@...nel.org>, Bastien Nocera <hadess@...ess.net>,
Hans de Goede <hdegoede@...hat.com>
Cc: Luca Weiss <luca.weiss@...rphone.com>, linux-input@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
phone-devel@...r.kernel.org, linux@...nlining.org,
~postmarketos/upstreaming@...ts.sr.ht
Subject: Re: [PATCH v3 2/2] Input: goodix_berlin - Add support for Berlin-A
series
On 07/03/2025 10:48, Jens Reidel wrote:
> The current implementation of the goodix_berlin driver lacks support for
> revisions A and B of the Berlin IC. This change adds support for the
> gt9897 IC, which is a Berlin-A revision part.
>
> The differences between revision D and A are rather minor, a handful of
> address changes and a slightly larger read buffer. They were taken from
> the driver published by Goodix, which does a few more things that don't
> appear to be necessary for the touchscreen to work properly.
>
> Tested-by: Luca Weiss <luca.weiss@...rphone.com>
> Signed-off-by: Jens Reidel <adrian@...nlining.org>
> ---
> drivers/input/touchscreen/goodix_berlin.h | 16 ++++++-
> .../input/touchscreen/goodix_berlin_core.c | 21 ++++----
> drivers/input/touchscreen/goodix_berlin_i2c.c | 14 ++++--
> drivers/input/touchscreen/goodix_berlin_spi.c | 48 ++++++++++++++-----
> 4 files changed, 73 insertions(+), 26 deletions(-)
>
> diff --git a/drivers/input/touchscreen/goodix_berlin.h b/drivers/input/touchscreen/goodix_berlin.h
> index 38b6f9ddbdef..d8bbd4853206 100644
> --- a/drivers/input/touchscreen/goodix_berlin.h
> +++ b/drivers/input/touchscreen/goodix_berlin.h
> @@ -12,12 +12,26 @@
>
> #include <linux/pm.h>
>
> +#define GOODIX_BERLIN_FW_VERSION_INFO_ADDR_A 0x1000C
> +#define GOODIX_BERLIN_FW_VERSION_INFO_ADDR_D 0x10014
> +
> +#define GOODIX_BERLIN_IC_INFO_ADDR_A 0x10068
> +#define GOODIX_BERLIN_IC_INFO_ADDR_D 0x10070
> +
> +struct goodix_berlin_ic_data {
> + int fw_version_info_addr;
> + int ic_info_addr;
> + ssize_t read_dummy_len;
> + ssize_t read_prefix_len;
> +};
> +
> struct device;
> struct input_id;
> struct regmap;
>
> int goodix_berlin_probe(struct device *dev, int irq, const struct input_id *id,
> - struct regmap *regmap);
> + struct regmap *regmap,
> + const struct goodix_berlin_ic_data *ic_data);
>
> extern const struct dev_pm_ops goodix_berlin_pm_ops;
> extern const struct attribute_group *goodix_berlin_groups[];
> diff --git a/drivers/input/touchscreen/goodix_berlin_core.c b/drivers/input/touchscreen/goodix_berlin_core.c
> index f7ea443b152e..02a1d9a465f2 100644
> --- a/drivers/input/touchscreen/goodix_berlin_core.c
> +++ b/drivers/input/touchscreen/goodix_berlin_core.c
> @@ -12,7 +12,7 @@
> * to the previous generations.
> *
> * Currently the driver only handles Multitouch events with already
> - * programmed firmware and "config" for "Revision D" Berlin IC.
> + * programmed firmware and "config" for "Revision A/D" Berlin IC.
> *
> * Support is missing for:
> * - ESD Management
> @@ -20,7 +20,7 @@
> * - "Config" update/flashing
> * - Stylus Events
> * - Gesture Events
> - * - Support for older revisions (A & B)
> + * - Support for revision B
> */
>
> #include <linux/bitfield.h>
> @@ -28,6 +28,7 @@
> #include <linux/input.h>
> #include <linux/input/mt.h>
> #include <linux/input/touchscreen.h>
> +#include <linux/property.h>
> #include <linux/regmap.h>
> #include <linux/regulator/consumer.h>
> #include <linux/sizes.h>
> @@ -53,10 +54,8 @@
>
> #define GOODIX_BERLIN_DEV_CONFIRM_VAL 0xAA
> #define GOODIX_BERLIN_BOOTOPTION_ADDR 0x10000
> -#define GOODIX_BERLIN_FW_VERSION_INFO_ADDR 0x10014
>
> #define GOODIX_BERLIN_IC_INFO_MAX_LEN SZ_1K
> -#define GOODIX_BERLIN_IC_INFO_ADDR 0x10070
>
> #define GOODIX_BERLIN_CHECKSUM_SIZE sizeof(u16)
>
> @@ -175,6 +174,8 @@ struct goodix_berlin_core {
> /* Runtime parameters extracted from IC_INFO buffer */
> u32 touch_data_addr;
>
> + const struct goodix_berlin_ic_data *ic_data;
> +
> struct goodix_berlin_event event;
> };
>
> @@ -299,7 +300,7 @@ static int goodix_berlin_read_version(struct goodix_berlin_core *cd)
> {
> int error;
>
> - error = regmap_raw_read(cd->regmap, GOODIX_BERLIN_FW_VERSION_INFO_ADDR,
> + error = regmap_raw_read(cd->regmap, cd->ic_data->fw_version_info_addr,
> &cd->fw_version, sizeof(cd->fw_version));
> if (error) {
> dev_err(cd->dev, "error reading fw version, %d\n", error);
> @@ -367,7 +368,7 @@ static int goodix_berlin_get_ic_info(struct goodix_berlin_core *cd)
> if (!afe_data)
> return -ENOMEM;
>
> - error = regmap_raw_read(cd->regmap, GOODIX_BERLIN_IC_INFO_ADDR,
> + error = regmap_raw_read(cd->regmap, cd->ic_data->ic_info_addr,
> &length_raw, sizeof(length_raw));
> if (error) {
> dev_err(cd->dev, "failed get ic info length, %d\n", error);
> @@ -380,8 +381,8 @@ static int goodix_berlin_get_ic_info(struct goodix_berlin_core *cd)
> return -EINVAL;
> }
>
> - error = regmap_raw_read(cd->regmap, GOODIX_BERLIN_IC_INFO_ADDR,
> - afe_data, length);
> + error = regmap_raw_read(cd->regmap, cd->ic_data->ic_info_addr, afe_data,
> + length);
> if (error) {
> dev_err(cd->dev, "failed get ic info data, %d\n", error);
> return error;
> @@ -716,7 +717,8 @@ const struct attribute_group *goodix_berlin_groups[] = {
> EXPORT_SYMBOL_GPL(goodix_berlin_groups);
>
> int goodix_berlin_probe(struct device *dev, int irq, const struct input_id *id,
> - struct regmap *regmap)
> + struct regmap *regmap,
> + const struct goodix_berlin_ic_data *ic_data)
> {
> struct goodix_berlin_core *cd;
> int error;
> @@ -733,6 +735,7 @@ int goodix_berlin_probe(struct device *dev, int irq, const struct input_id *id,
> cd->dev = dev;
> cd->regmap = regmap;
> cd->irq = irq;
> + cd->ic_data = ic_data;
>
> cd->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
> if (IS_ERR(cd->reset_gpio))
> diff --git a/drivers/input/touchscreen/goodix_berlin_i2c.c b/drivers/input/touchscreen/goodix_berlin_i2c.c
> index ad7a60d94338..059a25537aad 100644
> --- a/drivers/input/touchscreen/goodix_berlin_i2c.c
> +++ b/drivers/input/touchscreen/goodix_berlin_i2c.c
> @@ -31,6 +31,8 @@ static const struct input_id goodix_berlin_i2c_input_id = {
>
> static int goodix_berlin_i2c_probe(struct i2c_client *client)
> {
> + const struct goodix_berlin_ic_data *ic_data =
> + i2c_get_match_data(cd->dev);
> struct regmap *regmap;
> int error;
>
> @@ -39,22 +41,28 @@ static int goodix_berlin_i2c_probe(struct i2c_client *client)
> return PTR_ERR(regmap);
>
> error = goodix_berlin_probe(&client->dev, client->irq,
> - &goodix_berlin_i2c_input_id, regmap);
> + &goodix_berlin_i2c_input_id, regmap,
> + ic_data);
> if (error)
> return error;
>
> return 0;
> }
>
> +static const struct goodix_berlin_ic_data gt9916_data = {
> + .fw_version_info_addr = GOODIX_BERLIN_FW_VERSION_INFO_ADDR_D,
> + .ic_info_addr = GOODIX_BERLIN_IC_INFO_ADDR_D,
> +};
> +
> static const struct i2c_device_id goodix_berlin_i2c_id[] = {
> - { "gt9916" },
> + { .name = "gt9916", .driver_data = (long)>9916_data },
> { }
> };
>
> MODULE_DEVICE_TABLE(i2c, goodix_berlin_i2c_id);
>
> static const struct of_device_id goodix_berlin_i2c_of_match[] = {
> - { .compatible = "goodix,gt9916", },
> + { .compatible = "goodix,gt9916", .data = >9916_data },
> { }
> };
> MODULE_DEVICE_TABLE(of, goodix_berlin_i2c_of_match);
> diff --git a/drivers/input/touchscreen/goodix_berlin_spi.c b/drivers/input/touchscreen/goodix_berlin_spi.c
> index 0662e87b8692..01f850f484c2 100644
> --- a/drivers/input/touchscreen/goodix_berlin_spi.c
> +++ b/drivers/input/touchscreen/goodix_berlin_spi.c
> @@ -18,10 +18,14 @@
>
> #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 + \
> +#define GOODIX_BERLIN_SPI_READ_DUMMY_LEN_A 4
> +#define GOODIX_BERLIN_SPI_READ_DUMMY_LEN_D 3
> +#define GOODIX_BERLIN_SPI_READ_PREFIX_LEN_A (GOODIX_BERLIN_SPI_TRANS_PREFIX_LEN + \
> GOODIX_BERLIN_REGISTER_WIDTH + \
> - GOODIX_BERLIN_SPI_READ_DUMMY_LEN)
> + GOODIX_BERLIN_SPI_READ_DUMMY_LEN_A)
> +#define GOODIX_BERLIN_SPI_READ_PREFIX_LEN_D (GOODIX_BERLIN_SPI_TRANS_PREFIX_LEN + \
> + GOODIX_BERLIN_REGISTER_WIDTH + \
> + GOODIX_BERLIN_SPI_READ_DUMMY_LEN_D)
> #define GOODIX_BERLIN_SPI_WRITE_PREFIX_LEN (GOODIX_BERLIN_SPI_TRANS_PREFIX_LEN + \
> GOODIX_BERLIN_REGISTER_WIDTH)
>
> @@ -33,6 +37,7 @@ static int goodix_berlin_spi_read(void *context, const void *reg_buf,
> size_t val_size)
> {
> struct spi_device *spi = context;
> + const struct goodix_berlin_ic_data *ic_data = spi_get_device_match_data(spi);
> struct spi_transfer xfers;
> struct spi_message spi_msg;
> const u32 *reg = reg_buf; /* reg is stored as native u32 at start of buffer */
> @@ -42,23 +47,22 @@ static int goodix_berlin_spi_read(void *context, const void *reg_buf,
> return -EINVAL;
>
> u8 *buf __free(kfree) =
> - kzalloc(GOODIX_BERLIN_SPI_READ_PREFIX_LEN + val_size,
> - GFP_KERNEL);
> + kzalloc(ic_data->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 */
> + /* buffer format: 0xF1 + addr(4bytes) + dummy(3/4bytes) + 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);
> + 0xff, ic_data->read_dummy_len);
>
> xfers.tx_buf = buf;
> xfers.rx_buf = buf;
> - xfers.len = GOODIX_BERLIN_SPI_READ_PREFIX_LEN + val_size;
> + xfers.len = ic_data->read_prefix_len + val_size;
> xfers.cs_change = 0;
> spi_message_add_tail(&xfers, &spi_msg);
>
> @@ -68,7 +72,7 @@ static int goodix_berlin_spi_read(void *context, const void *reg_buf,
> return error;
> }
>
> - memcpy(val_buf, buf + GOODIX_BERLIN_SPI_READ_PREFIX_LEN, val_size);
> + memcpy(val_buf, buf + ic_data->read_prefix_len, val_size);
> return error;
> }
>
> @@ -123,6 +127,7 @@ static const struct input_id goodix_berlin_spi_input_id = {
>
> static int goodix_berlin_spi_probe(struct spi_device *spi)
> {
> + const struct goodix_berlin_ic_data *ic_data = spi_get_device_match_data(spi);
> struct regmap_config regmap_config;
> struct regmap *regmap;
> size_t max_size;
> @@ -137,7 +142,7 @@ static int goodix_berlin_spi_probe(struct spi_device *spi)
> 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_read = max_size - ic_data->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);
> @@ -145,21 +150,38 @@ static int goodix_berlin_spi_probe(struct spi_device *spi)
> return PTR_ERR(regmap);
>
> error = goodix_berlin_probe(&spi->dev, spi->irq,
> - &goodix_berlin_spi_input_id, regmap);
> + &goodix_berlin_spi_input_id, regmap,
> + ic_data);
> if (error)
> return error;
>
> return 0;
> }
>
> +static const struct goodix_berlin_ic_data gt9897_data = {
> + .fw_version_info_addr = GOODIX_BERLIN_FW_VERSION_INFO_ADDR_A,
> + .ic_info_addr = GOODIX_BERLIN_IC_INFO_ADDR_A,
> + .read_dummy_len = GOODIX_BERLIN_SPI_READ_DUMMY_LEN_A,
> + .read_prefix_len = GOODIX_BERLIN_SPI_READ_PREFIX_LEN_A,
> +};
> +
> +static const struct goodix_berlin_ic_data gt9916_data = {
> + .fw_version_info_addr = GOODIX_BERLIN_FW_VERSION_INFO_ADDR_D,
> + .ic_info_addr = GOODIX_BERLIN_IC_INFO_ADDR_D,
> + .read_dummy_len = GOODIX_BERLIN_SPI_READ_DUMMY_LEN_D,
> + .read_prefix_len = GOODIX_BERLIN_SPI_READ_PREFIX_LEN_D,
> +};
> +
> static const struct spi_device_id goodix_berlin_spi_ids[] = {
> - { "gt9916" },
> + { .name = "gt9897", .driver_data = (long)>9897_data },
> + { .name = "gt9916", .driver_data = (long)>9916_data },
> { },
> };
> MODULE_DEVICE_TABLE(spi, goodix_berlin_spi_ids);
>
> static const struct of_device_id goodix_berlin_spi_of_match[] = {
> - { .compatible = "goodix,gt9916", },
> + { .compatible = "goodix,gt9897", .data = >9897_data },
> + { .compatible = "goodix,gt9916", .data = >9916_data },
> { }
> };
> MODULE_DEVICE_TABLE(of, goodix_berlin_spi_of_match);
Thanks !
Reviewed-by: Neil Armstrong <neil.armstrong@...aro.org>
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