drivers/input/touchscreen/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
  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>");