tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
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)>9916_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 = >9916_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>");