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 20 static 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 */ 28 static const struct input_id goodix_berlin_i2c_input_id = { 29 .bustype = BUS_I2C, 30 }; 31 32 static int goodix_berlin_i2c_probe(struct i2c_client *client) 33 { 34 struct regmap *regmap; 35 int error; 36 37 regmap = devm_regmap_init_i2c(client, &goodix_berlin_i2c_regmap_conf); 38 if (IS_ERR(regmap)) 39 return PTR_ERR(regmap); 40 41 error = goodix_berlin_probe(&client->dev, client->irq, 42 &goodix_berlin_i2c_input_id, regmap); 43 if (error) 44 return error; 45 46 return 0; 47 } 48 49 static const struct i2c_device_id goodix_berlin_i2c_id[] = { 50 { "gt9916" }, 51 { } 52 }; 53 54 MODULE_DEVICE_TABLE(i2c, goodix_berlin_i2c_id); 55 56 static const struct of_device_id goodix_berlin_i2c_of_match[] = { 57 { .compatible = "goodix,gt9916", }, 58 { } 59 }; 60 MODULE_DEVICE_TABLE(of, goodix_berlin_i2c_of_match); 61 62 static struct i2c_driver goodix_berlin_i2c_driver = { 63 .driver = { 64 .name = "goodix-berlin-i2c", 65 .of_match_table = goodix_berlin_i2c_of_match, 66 .pm = pm_sleep_ptr(&goodix_berlin_pm_ops), 67 .dev_groups = goodix_berlin_groups, 68 }, 69 .probe = goodix_berlin_i2c_probe, 70 .id_table = goodix_berlin_i2c_id, 71 }; 72 module_i2c_driver(goodix_berlin_i2c_driver); 73 74 MODULE_LICENSE("GPL"); 75 MODULE_DESCRIPTION("Goodix Berlin I2C Touchscreen driver"); 76 MODULE_AUTHOR("Neil Armstrong <neil.armstrong@linaro.org>"); 77