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Export a sysfs interface that would allow reading and writing touchscreen IC registers. With this interface many things can be done in usersapce such as firmware updates. An example tool that utilizes this interface for performing firmware updates can be found at [1]. [1] https://github.com/goodix/fwupdate_for_berlin_linux Signed-off-by: Charles Wang <charles.goodix@gmail.com> Link: https://lore.kernel.org/r/20240514115135.21410-1-charles.goodix@gmail.com Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
77 lines
1.9 KiB
C
77 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Goodix Berlin Touchscreen Driver
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*
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* Copyright (C) 2020 - 2021 Goodix, Inc.
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* Copyright (C) 2023 Linaro Ltd.
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*
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* Based on goodix_ts_berlin driver.
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*/
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#include <linux/i2c.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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#include <linux/input.h>
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#include "goodix_berlin.h"
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#define I2C_MAX_TRANSFER_SIZE 256
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static const struct regmap_config goodix_berlin_i2c_regmap_conf = {
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.reg_bits = 32,
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.val_bits = 8,
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.max_raw_read = I2C_MAX_TRANSFER_SIZE,
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.max_raw_write = I2C_MAX_TRANSFER_SIZE,
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};
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/* vendor & product left unassigned here, should probably be updated from fw info */
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static const struct input_id goodix_berlin_i2c_input_id = {
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.bustype = BUS_I2C,
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};
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static int goodix_berlin_i2c_probe(struct i2c_client *client)
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{
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struct regmap *regmap;
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int error;
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regmap = devm_regmap_init_i2c(client, &goodix_berlin_i2c_regmap_conf);
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if (IS_ERR(regmap))
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return PTR_ERR(regmap);
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error = goodix_berlin_probe(&client->dev, client->irq,
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&goodix_berlin_i2c_input_id, regmap);
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if (error)
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return error;
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return 0;
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}
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static const struct i2c_device_id goodix_berlin_i2c_id[] = {
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{ "gt9916" },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, goodix_berlin_i2c_id);
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static const struct of_device_id goodix_berlin_i2c_of_match[] = {
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{ .compatible = "goodix,gt9916", },
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{ }
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};
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MODULE_DEVICE_TABLE(of, goodix_berlin_i2c_of_match);
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static struct i2c_driver goodix_berlin_i2c_driver = {
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.driver = {
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.name = "goodix-berlin-i2c",
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.of_match_table = goodix_berlin_i2c_of_match,
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.pm = pm_sleep_ptr(&goodix_berlin_pm_ops),
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.dev_groups = goodix_berlin_groups,
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},
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.probe = goodix_berlin_i2c_probe,
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.id_table = goodix_berlin_i2c_id,
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};
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module_i2c_driver(goodix_berlin_i2c_driver);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Goodix Berlin I2C Touchscreen driver");
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MODULE_AUTHOR("Neil Armstrong <neil.armstrong@linaro.org>");
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