1 /* 2 * AD7879-1/AD7889-1 touchscreen (I2C bus) 3 * 4 * Copyright (C) 2008-2010 Michael Hennerich, Analog Devices Inc. 5 * 6 * Licensed under the GPL-2 or later. 7 */ 8 9 #include <linux/input.h> /* BUS_I2C */ 10 #include <linux/i2c.h> 11 #include <linux/module.h> 12 #include <linux/types.h> 13 #include <linux/of.h> 14 #include <linux/pm.h> 15 #include <linux/regmap.h> 16 17 #include "ad7879.h" 18 19 #define AD7879_DEVID 0x79 /* AD7879-1/AD7889-1 */ 20 21 static const struct regmap_config ad7879_i2c_regmap_config = { 22 .reg_bits = 8, 23 .val_bits = 16, 24 .max_register = 15, 25 }; 26 27 static int ad7879_i2c_probe(struct i2c_client *client, 28 const struct i2c_device_id *id) 29 { 30 struct regmap *regmap; 31 32 if (!i2c_check_functionality(client->adapter, 33 I2C_FUNC_SMBUS_WORD_DATA)) { 34 dev_err(&client->dev, "SMBUS Word Data not Supported\n"); 35 return -EIO; 36 } 37 38 regmap = devm_regmap_init_i2c(client, &ad7879_i2c_regmap_config); 39 if (IS_ERR(regmap)) 40 return PTR_ERR(regmap); 41 42 return ad7879_probe(&client->dev, regmap, client->irq, 43 BUS_I2C, AD7879_DEVID); 44 } 45 46 static const struct i2c_device_id ad7879_id[] = { 47 { "ad7879", 0 }, 48 { "ad7889", 0 }, 49 { } 50 }; 51 MODULE_DEVICE_TABLE(i2c, ad7879_id); 52 53 #ifdef CONFIG_OF 54 static const struct of_device_id ad7879_i2c_dt_ids[] = { 55 { .compatible = "adi,ad7879-1", }, 56 { } 57 }; 58 MODULE_DEVICE_TABLE(of, ad7879_i2c_dt_ids); 59 #endif 60 61 static struct i2c_driver ad7879_i2c_driver = { 62 .driver = { 63 .name = "ad7879", 64 .pm = &ad7879_pm_ops, 65 .of_match_table = of_match_ptr(ad7879_i2c_dt_ids), 66 }, 67 .probe = ad7879_i2c_probe, 68 .id_table = ad7879_id, 69 }; 70 71 module_i2c_driver(ad7879_i2c_driver); 72 73 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>"); 74 MODULE_DESCRIPTION("AD7879(-1) touchscreen I2C bus driver"); 75 MODULE_LICENSE("GPL"); 76