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fba09e817c
Add initial support for the new Goodix "Berlin" touchscreen ICs over the I2C interface. 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 <jeff@labundy.com> Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org> Link: https://lore.kernel.org/r/20240129-topic-goodix-berlin-upstream-initial-v15-3-6f7d096c0a0a@linaro.org Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
75 lines
1.8 KiB
C
75 lines
1.8 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", 0 },
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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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},
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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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