1 /* 2 * TSC2004 touchscreen driver 3 * 4 * Copyright (C) 2015 QWERTY Embedded Design 5 * Copyright (C) 2015 EMAC Inc. 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 */ 17 18 #include <linux/module.h> 19 #include <linux/input.h> 20 #include <linux/of.h> 21 #include <linux/i2c.h> 22 #include <linux/regmap.h> 23 #include "tsc200x-core.h" 24 25 static const struct input_id tsc2004_input_id = { 26 .bustype = BUS_I2C, 27 .product = 2004, 28 }; 29 30 static int tsc2004_cmd(struct device *dev, u8 cmd) 31 { 32 u8 tx = TSC200X_CMD | TSC200X_CMD_12BIT | cmd; 33 s32 data; 34 struct i2c_client *i2c = to_i2c_client(dev); 35 36 data = i2c_smbus_write_byte(i2c, tx); 37 if (data < 0) { 38 dev_err(dev, "%s: failed, command: %x i2c error: %d\n", 39 __func__, cmd, data); 40 return data; 41 } 42 43 return 0; 44 } 45 46 static int tsc2004_probe(struct i2c_client *i2c, 47 const struct i2c_device_id *id) 48 49 { 50 return tsc200x_probe(&i2c->dev, i2c->irq, &tsc2004_input_id, 51 devm_regmap_init_i2c(i2c, &tsc200x_regmap_config), 52 tsc2004_cmd); 53 } 54 55 static int tsc2004_remove(struct i2c_client *i2c) 56 { 57 return tsc200x_remove(&i2c->dev); 58 } 59 60 static const struct i2c_device_id tsc2004_idtable[] = { 61 { "tsc2004", 0 }, 62 { } 63 }; 64 MODULE_DEVICE_TABLE(i2c, tsc2004_idtable); 65 66 #ifdef CONFIG_OF 67 static const struct of_device_id tsc2004_of_match[] = { 68 { .compatible = "ti,tsc2004" }, 69 { /* sentinel */ } 70 }; 71 MODULE_DEVICE_TABLE(of, tsc2004_of_match); 72 #endif 73 74 static struct i2c_driver tsc2004_driver = { 75 .driver = { 76 .name = "tsc2004", 77 .of_match_table = of_match_ptr(tsc2004_of_match), 78 .pm = &tsc200x_pm_ops, 79 }, 80 .id_table = tsc2004_idtable, 81 .probe = tsc2004_probe, 82 .remove = tsc2004_remove, 83 }; 84 module_i2c_driver(tsc2004_driver); 85 86 MODULE_AUTHOR("Michael Welling <mwelling@ieee.org>"); 87 MODULE_DESCRIPTION("TSC2004 Touchscreen Driver"); 88 MODULE_LICENSE("GPL"); 89