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 { 28 struct regmap *regmap; 29 30 if (!i2c_check_functionality(client->adapter, 31 I2C_FUNC_SMBUS_WORD_DATA)) { 32 dev_err(&client->dev, "SMBUS Word Data not Supported\n"); 33 return -EIO; 34 } 35 36 regmap = devm_regmap_init_i2c(client, &ad7879_i2c_regmap_config); 37 if (IS_ERR(regmap)) 38 return PTR_ERR(regmap); 39 40 return ad7879_probe(&client->dev, regmap, client->irq, 41 BUS_I2C, AD7879_DEVID); 42 } 43 44 static const struct i2c_device_id ad7879_id[] = { 45 { "ad7879", 0 }, 46 { "ad7889", 0 }, 47 { } 48 }; 49 MODULE_DEVICE_TABLE(i2c, ad7879_id); 50 51 #ifdef CONFIG_OF 52 static const struct of_device_id ad7879_i2c_dt_ids[] = { 53 { .compatible = "adi,ad7879-1", }, 54 { } 55 }; 56 MODULE_DEVICE_TABLE(of, ad7879_i2c_dt_ids); 57 #endif 58 59 static struct i2c_driver ad7879_i2c_driver = { 60 .driver = { 61 .name = "ad7879", 62 .dev_groups = ad7879_groups, 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