goodix_berlin_i2c.c

 1// SPDX-License-Identifier: GPL-2.0-or-later
 2/*
 3 * Goodix Berlin Touchscreen Driver
 4 *
 5 * Copyright (C) 2020 - 2021 Goodix, Inc.
 6 * Copyright (C) 2023 Linaro Ltd.
 7 *
 8 * Based on goodix_ts_berlin driver.
 9 */
10#include <linux/i2c.h>
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/regmap.h>
14#include <linux/input.h>
15
16#include "goodix_berlin.h"
17
18#define I2C_MAX_TRANSFER_SIZE		256
19
20static const struct regmap_config goodix_berlin_i2c_regmap_conf = {
21	.reg_bits = 32,
22	.val_bits = 8,
23	.max_raw_read = I2C_MAX_TRANSFER_SIZE,
24	.max_raw_write = I2C_MAX_TRANSFER_SIZE,
25};
26
27/* vendor & product left unassigned here, should probably be updated from fw info */
28static const struct input_id goodix_berlin_i2c_input_id = {
29	.bustype = BUS_I2C,
30};
31
32static int goodix_berlin_i2c_probe(struct i2c_client *client)
33{
34	const struct goodix_berlin_ic_data *ic_data =
35		i2c_get_match_data(client);
36	struct regmap *regmap;
37	int error;
38
39	regmap = devm_regmap_init_i2c(client, &goodix_berlin_i2c_regmap_conf);
40	if (IS_ERR(regmap))
41		return PTR_ERR(regmap);
42
43	error = goodix_berlin_probe(&client->dev, client->irq,
44				    &goodix_berlin_i2c_input_id, regmap,
45				    ic_data);
46	if (error)
47		return error;
48
49	return 0;
50}
51
52static const struct goodix_berlin_ic_data gt9916_data = {
53	.fw_version_info_addr = GOODIX_BERLIN_FW_VERSION_INFO_ADDR_D,
54	.ic_info_addr = GOODIX_BERLIN_IC_INFO_ADDR_D,
55};
56
57static const struct i2c_device_id goodix_berlin_i2c_id[] = {
58	{ .name = "gt9916", .driver_data = (long)&gt9916_data },
59	{ }
60};
61
62MODULE_DEVICE_TABLE(i2c, goodix_berlin_i2c_id);
63
64static const struct of_device_id goodix_berlin_i2c_of_match[] = {
65	{ .compatible = "goodix,gt9916", .data = &gt9916_data },
66	{ }
67};
68MODULE_DEVICE_TABLE(of, goodix_berlin_i2c_of_match);
69
70static struct i2c_driver goodix_berlin_i2c_driver = {
71	.driver = {
72		.name = "goodix-berlin-i2c",
73		.of_match_table = goodix_berlin_i2c_of_match,
74		.pm = pm_sleep_ptr(&goodix_berlin_pm_ops),
75		.dev_groups = goodix_berlin_groups,
76	},
77	.probe = goodix_berlin_i2c_probe,
78	.id_table = goodix_berlin_i2c_id,
79};
80module_i2c_driver(goodix_berlin_i2c_driver);
81
82MODULE_LICENSE("GPL");
83MODULE_DESCRIPTION("Goodix Berlin I2C Touchscreen driver");
84MODULE_AUTHOR("Neil Armstrong <neil.armstrong@linaro.org>");