| Michael Welling | a748941 | 2015-11-02 22:54:23 -0800 | [diff] [blame] | 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 int tsc2004_cmd(struct device *dev, u8 cmd) |
| 26 | { |
| 27 | u8 tx = TSC200X_CMD | TSC200X_CMD_12BIT | cmd; |
| 28 | s32 data; |
| 29 | struct i2c_client *i2c = to_i2c_client(dev); |
| 30 | |
| 31 | data = i2c_smbus_write_byte(i2c, tx); |
| 32 | if (data < 0) { |
| 33 | dev_err(dev, "%s: failed, command: %x i2c error: %d\n", |
| 34 | __func__, cmd, data); |
| 35 | return data; |
| 36 | } |
| 37 | |
| 38 | return 0; |
| 39 | } |
| 40 | |
| 41 | static int tsc2004_probe(struct i2c_client *i2c, |
| 42 | const struct i2c_device_id *id) |
| 43 | |
| 44 | { |
| 45 | return tsc200x_probe(&i2c->dev, i2c->irq, BUS_I2C, |
| 46 | devm_regmap_init_i2c(i2c, &tsc200x_regmap_config), |
| 47 | tsc2004_cmd); |
| 48 | } |
| 49 | |
| 50 | static int tsc2004_remove(struct i2c_client *i2c) |
| 51 | { |
| 52 | return tsc200x_remove(&i2c->dev); |
| 53 | } |
| 54 | |
| 55 | static const struct i2c_device_id tsc2004_idtable[] = { |
| 56 | { "tsc2004", 0 }, |
| 57 | { } |
| 58 | }; |
| 59 | MODULE_DEVICE_TABLE(i2c, tsc2004_idtable); |
| 60 | |
| 61 | #ifdef CONFIG_OF |
| 62 | static const struct of_device_id tsc2004_of_match[] = { |
| 63 | { .compatible = "ti,tsc2004" }, |
| 64 | { /* sentinel */ } |
| 65 | }; |
| 66 | MODULE_DEVICE_TABLE(of, tsc2004_of_match); |
| 67 | #endif |
| 68 | |
| 69 | static struct i2c_driver tsc2004_driver = { |
| 70 | .driver = { |
| 71 | .name = "tsc2004", |
| 72 | .of_match_table = of_match_ptr(tsc2004_of_match), |
| 73 | .pm = &tsc200x_pm_ops, |
| 74 | }, |
| 75 | .id_table = tsc2004_idtable, |
| 76 | .probe = tsc2004_probe, |
| 77 | .remove = tsc2004_remove, |
| 78 | }; |
| 79 | module_i2c_driver(tsc2004_driver); |
| 80 | |
| 81 | MODULE_AUTHOR("Michael Welling <mwelling@ieee.org>"); |
| 82 | MODULE_DESCRIPTION("TSC2004 Touchscreen Driver"); |
| 83 | MODULE_LICENSE("GPL"); |