93 lines
2.2 KiB
C
93 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2023 Ky Co., Ltd.
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*
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*/
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/of_graph.h>
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#include <linux/regmap.h>
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struct ocp2138_dev {
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struct device *dev;
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struct regmap *regmap;
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struct i2c_client *client;
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};
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static const struct regmap_config ocp2138_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = 0xff,
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};
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static int ocp2138_probe(struct i2c_client *client)
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{
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struct ocp2138_dev *ocp2138;
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unsigned int value;
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dev_info(&client->dev, "%s()\n", __func__);
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
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dev_err(&client->dev, "Failed check I2C functionality");
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return -ENODEV;
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}
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ocp2138 = devm_kzalloc(&client->dev, sizeof(*ocp2138), GFP_KERNEL);
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if (!ocp2138)
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return -ENOMEM;
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i2c_set_clientdata(client, ocp2138);
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ocp2138->dev = &client->dev;
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ocp2138->client = client;
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ocp2138->regmap = devm_regmap_init_i2c(client, &ocp2138_regmap_config);
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if (IS_ERR(ocp2138->regmap)) {
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dev_err(ocp2138->dev, "regmap i2c init failed\n");
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return PTR_ERR(ocp2138->regmap);
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}
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regmap_write(ocp2138->regmap, 0x00, 0x14);
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regmap_write(ocp2138->regmap, 0x01, 0x14);
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regmap_write(ocp2138->regmap, 0xff, 0x80);
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regmap_read(ocp2138->regmap, 0x00, &value);
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dev_info(ocp2138->dev, "%s() 0x00 %d\n", __func__, value);
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regmap_read(ocp2138->regmap, 0x01, &value);
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dev_info(ocp2138->dev, "%s() 0x01 %d\n", __func__, value);
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regmap_read(ocp2138->regmap, 0xff, &value);
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dev_info(ocp2138->dev, "%s() 0xff %d\n", __func__, value);
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return 0;
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}
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static void ocp2138_remove(struct i2c_client *client)
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{
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dev_info(&client->dev, "%s()\n", __func__);
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}
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static const struct i2c_device_id ocp2138_ids[] = {
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{ "ocp2138", 0 },
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{},
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};
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MODULE_DEVICE_TABLE(i2c, ocp2138_ids);
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static const struct of_device_id ocp2138_of_match[] = {
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{ .compatible = "ky,lcd_bias_ocp2138", },
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{ },
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};
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MODULE_DEVICE_TABLE(of, ocp2138_of_match);
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static struct i2c_driver ocp2138_i2c_driver = {
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.driver = {
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.name = "ocp2138",
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.of_match_table = ocp2138_of_match,
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},
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.probe = ocp2138_probe,
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.remove = ocp2138_remove,
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.id_table = ocp2138_ids,
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};
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module_i2c_driver(ocp2138_i2c_driver);
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MODULE_DESCRIPTION("OCP2138 I2C Driver");
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MODULE_LICENSE("GPL v2"); |