1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * AD7879-1/AD7889-1 touchscreen (I2C bus) 4 * 5 * Copyright (C) 2008-2010 Michael Hennerich, Analog Devices Inc. 6 */ 7 8 #include <linux/input.h> /* BUS_I2C */ 9 #include <linux/i2c.h> 10 #include <linux/module.h> 11 #include <linux/types.h> 12 #include <linux/of.h> 13 #include <linux/pm.h> 14 #include <linux/regmap.h> 15 16 #include "ad7879.h" 17 18 #define AD7879_DEVID 0x79 /* AD7879-1/AD7889-1 */ 19 20 static const struct regmap_config ad7879_i2c_regmap_config = { 21 .reg_bits = 8, 22 .val_bits = 16, 23 .max_register = 15, 24 }; 25 26 static int ad7879_i2c_probe(struct i2c_client *client, 27 const struct i2c_device_id *id) 28 { 29 struct regmap *regmap; 30 31 if (!i2c_check_functionality(client->adapter, 32 I2C_FUNC_SMBUS_WORD_DATA)) { 33 dev_err(&client->dev, "SMBUS Word Data not Supported\n"); 34 return -EIO; 35 } 36 37 regmap = devm_regmap_init_i2c(client, &ad7879_i2c_regmap_config); 38 if (IS_ERR(regmap)) 39 return PTR_ERR(regmap); 40 41 return ad7879_probe(&client->dev, regmap, client->irq, 42 BUS_I2C, AD7879_DEVID); 43 } 44 45 static const struct i2c_device_id ad7879_id[] = { 46 { "ad7879", 0 }, 47 { "ad7889", 0 }, 48 { } 49 }; 50 MODULE_DEVICE_TABLE(i2c, ad7879_id); 51 52 #ifdef CONFIG_OF 53 static const struct of_device_id ad7879_i2c_dt_ids[] = { 54 { .compatible = "adi,ad7879-1", }, 55 { } 56 }; 57 MODULE_DEVICE_TABLE(of, ad7879_i2c_dt_ids); 58 #endif 59 60 static struct i2c_driver ad7879_i2c_driver = { 61 .driver = { 62 .name = "ad7879", 63 .pm = &ad7879_pm_ops, 64 .of_match_table = of_match_ptr(ad7879_i2c_dt_ids), 65 }, 66 .probe = ad7879_i2c_probe, 67 .id_table = ad7879_id, 68 }; 69 70 module_i2c_driver(ad7879_i2c_driver); 71 72 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>"); 73 MODULE_DESCRIPTION("AD7879(-1) touchscreen I2C bus driver"); 74 MODULE_LICENSE("GPL"); 75