1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * TSC2004 touchscreen driver 4 * 5 * Copyright (C) 2015 QWERTY Embedded Design 6 * Copyright (C) 2015 EMAC Inc. 7 */ 8 9 #include <linux/module.h> 10 #include <linux/input.h> 11 #include <linux/of.h> 12 #include <linux/i2c.h> 13 #include <linux/regmap.h> 14 #include "tsc200x-core.h" 15 16 static const struct input_id tsc2004_input_id = { 17 .bustype = BUS_I2C, 18 .product = 2004, 19 }; 20 21 static int tsc2004_cmd(struct device *dev, u8 cmd) 22 { 23 u8 tx = TSC200X_CMD | TSC200X_CMD_12BIT | cmd; 24 s32 data; 25 struct i2c_client *i2c = to_i2c_client(dev); 26 27 data = i2c_smbus_write_byte(i2c, tx); 28 if (data < 0) { 29 dev_err(dev, "%s: failed, command: %x i2c error: %d\n", 30 __func__, cmd, data); 31 return data; 32 } 33 34 return 0; 35 } 36 37 static int tsc2004_probe(struct i2c_client *i2c) 38 39 { 40 return tsc200x_probe(&i2c->dev, i2c->irq, &tsc2004_input_id, 41 devm_regmap_init_i2c(i2c, &tsc200x_regmap_config), 42 tsc2004_cmd); 43 } 44 45 static const struct i2c_device_id tsc2004_idtable[] = { 46 { "tsc2004" }, 47 { } 48 }; 49 MODULE_DEVICE_TABLE(i2c, tsc2004_idtable); 50 51 #ifdef CONFIG_OF 52 static const struct of_device_id tsc2004_of_match[] = { 53 { .compatible = "ti,tsc2004" }, 54 { /* sentinel */ } 55 }; 56 MODULE_DEVICE_TABLE(of, tsc2004_of_match); 57 #endif 58 59 static struct i2c_driver tsc2004_driver = { 60 .driver = { 61 .name = "tsc2004", 62 .dev_groups = tsc200x_groups, 63 .of_match_table = of_match_ptr(tsc2004_of_match), 64 .pm = pm_sleep_ptr(&tsc200x_pm_ops), 65 }, 66 .id_table = tsc2004_idtable, 67 .probe = tsc2004_probe, 68 }; 69 module_i2c_driver(tsc2004_driver); 70 71 MODULE_AUTHOR("Michael Welling <mwelling@ieee.org>"); 72 MODULE_DESCRIPTION("TSC2004 Touchscreen Driver"); 73 MODULE_LICENSE("GPL"); 74