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 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 52 static 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 57 static const struct i2c_device_id goodix_berlin_i2c_id[] = { 58 { .name = "gt9916", .driver_data = (long)>9916_data }, 59 { } 60 }; 61 62 MODULE_DEVICE_TABLE(i2c, goodix_berlin_i2c_id); 63 64 static const struct of_device_id goodix_berlin_i2c_of_match[] = { 65 { .compatible = "goodix,gt9916", .data = >9916_data }, 66 { } 67 }; 68 MODULE_DEVICE_TABLE(of, goodix_berlin_i2c_of_match); 69 70 static 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 }; 80 module_i2c_driver(goodix_berlin_i2c_driver); 81 82 MODULE_LICENSE("GPL"); 83 MODULE_DESCRIPTION("Goodix Berlin I2C Touchscreen driver"); 84 MODULE_AUTHOR("Neil Armstrong <neil.armstrong@linaro.org>"); 85