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 ad7879 *ts; 31 struct regmap *regmap; 32 33 if (!i2c_check_functionality(client->adapter, 34 I2C_FUNC_SMBUS_WORD_DATA)) { 35 dev_err(&client->dev, "SMBUS Word Data not Supported\n"); 36 return -EIO; 37 } 38 39 regmap = devm_regmap_init_i2c(client, &ad7879_i2c_regmap_config); 40 if (IS_ERR(regmap)) 41 return PTR_ERR(regmap); 42 43 ts = ad7879_probe(&client->dev, regmap, client->irq, 44 BUS_I2C, AD7879_DEVID); 45 if (IS_ERR(ts)) 46 return PTR_ERR(ts); 47 48 return 0; 49 } 50 51 static const struct i2c_device_id ad7879_id[] = { 52 { "ad7879", 0 }, 53 { "ad7889", 0 }, 54 { } 55 }; 56 MODULE_DEVICE_TABLE(i2c, ad7879_id); 57 58 #ifdef CONFIG_OF 59 static const struct of_device_id ad7879_i2c_dt_ids[] = { 60 { .compatible = "adi,ad7879-1", }, 61 { } 62 }; 63 MODULE_DEVICE_TABLE(of, ad7879_i2c_dt_ids); 64 #endif 65 66 static struct i2c_driver ad7879_i2c_driver = { 67 .driver = { 68 .name = "ad7879", 69 .pm = &ad7879_pm_ops, 70 .of_match_table = of_match_ptr(ad7879_i2c_dt_ids), 71 }, 72 .probe = ad7879_i2c_probe, 73 .id_table = ad7879_id, 74 }; 75 76 module_i2c_driver(ad7879_i2c_driver); 77 78 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>"); 79 MODULE_DESCRIPTION("AD7879(-1) touchscreen I2C bus driver"); 80 MODULE_LICENSE("GPL"); 81