1// SPDX-License-Identifier: GPL-2.0-or-later
 2/*
 3 * AD7879-1/AD7889-1 touchscreen (I2C bus)
 4 *
 5 * Copyright (C) 2008-2010 Michael Hennerich, Analog Devices Inc.
 
 
 6 */
 7
 8#include <linux/input.h>	/* BUS_I2C */
 9#include <linux/i2c.h>
10#include <linux/module.h>
11#include <linux/types.h>
12#include <linux/of.h>
13#include <linux/pm.h>
14#include <linux/regmap.h>
15
16#include "ad7879.h"
17
18#define AD7879_DEVID		0x79	/* AD7879-1/AD7889-1 */
19
20static const struct regmap_config ad7879_i2c_regmap_config = {
21	.reg_bits = 8,
22	.val_bits = 16,
23	.max_register = 15,
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
24};
25
26static int ad7879_i2c_probe(struct i2c_client *client)
 
27{
28	struct regmap *regmap;
29
30	if (!i2c_check_functionality(client->adapter,
31				     I2C_FUNC_SMBUS_WORD_DATA)) {
32		dev_err(&client->dev, "SMBUS Word Data not Supported\n");
33		return -EIO;
34	}
35
36	regmap = devm_regmap_init_i2c(client, &ad7879_i2c_regmap_config);
37	if (IS_ERR(regmap))
38		return PTR_ERR(regmap);
 
 
 
 
 
 
 
 
 
 
 
 
39
40	return ad7879_probe(&client->dev, regmap, client->irq,
41			    BUS_I2C, AD7879_DEVID);
42}
43
44static const struct i2c_device_id ad7879_id[] = {
45	{ "ad7879", 0 },
46	{ "ad7889", 0 },
47	{ }
48};
49MODULE_DEVICE_TABLE(i2c, ad7879_id);
50
51#ifdef CONFIG_OF
52static const struct of_device_id ad7879_i2c_dt_ids[] = {
53	{ .compatible = "adi,ad7879-1", },
54	{ }
55};
56MODULE_DEVICE_TABLE(of, ad7879_i2c_dt_ids);
57#endif
58
59static struct i2c_driver ad7879_i2c_driver = {
60	.driver = {
61		.name		= "ad7879",
62		.dev_groups	= ad7879_groups,
63		.pm		= &ad7879_pm_ops,
64		.of_match_table	= of_match_ptr(ad7879_i2c_dt_ids),
65	},
66	.probe		= ad7879_i2c_probe,
 
67	.id_table	= ad7879_id,
68};
69
70module_i2c_driver(ad7879_i2c_driver);
71
72MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
73MODULE_DESCRIPTION("AD7879(-1) touchscreen I2C bus driver");
74MODULE_LICENSE("GPL");

 
  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
 16#include "ad7879.h"
 17
 18#define AD7879_DEVID		0x79	/* AD7879-1/AD7889-1 */
 19
 20/* All registers are word-sized.
 21 * AD7879 uses a high-byte first convention.
 22 */
 23static int ad7879_i2c_read(struct device *dev, u8 reg)
 24{
 25	struct i2c_client *client = to_i2c_client(dev);
 26
 27	return i2c_smbus_read_word_swapped(client, reg);
 28}
 29
 30static int ad7879_i2c_multi_read(struct device *dev,
 31				 u8 first_reg, u8 count, u16 *buf)
 32{
 33	struct i2c_client *client = to_i2c_client(dev);
 34	u8 idx;
 35
 36	i2c_smbus_read_i2c_block_data(client, first_reg, count * 2, (u8 *)buf);
 37
 38	for (idx = 0; idx < count; ++idx)
 39		buf[idx] = swab16(buf[idx]);
 40
 41	return 0;
 42}
 43
 44static int ad7879_i2c_write(struct device *dev, u8 reg, u16 val)
 45{
 46	struct i2c_client *client = to_i2c_client(dev);
 47
 48	return i2c_smbus_write_word_swapped(client, reg, val);
 49}
 50
 51static const struct ad7879_bus_ops ad7879_i2c_bus_ops = {
 52	.bustype	= BUS_I2C,
 53	.read		= ad7879_i2c_read,
 54	.multi_read	= ad7879_i2c_multi_read,
 55	.write		= ad7879_i2c_write,
 56};
 57
 58static int ad7879_i2c_probe(struct i2c_client *client,
 59				      const struct i2c_device_id *id)
 60{
 61	struct ad7879 *ts;
 62
 63	if (!i2c_check_functionality(client->adapter,
 64				     I2C_FUNC_SMBUS_WORD_DATA)) {
 65		dev_err(&client->dev, "SMBUS Word Data not Supported\n");
 66		return -EIO;
 67	}
 68
 69	ts = ad7879_probe(&client->dev, AD7879_DEVID, client->irq,
 70			  &ad7879_i2c_bus_ops);
 71	if (IS_ERR(ts))
 72		return PTR_ERR(ts);
 73
 74	i2c_set_clientdata(client, ts);
 75
 76	return 0;
 77}
 78
 79static int ad7879_i2c_remove(struct i2c_client *client)
 80{
 81	struct ad7879 *ts = i2c_get_clientdata(client);
 82
 83	ad7879_remove(ts);
 84
 85	return 0;
 
 86}
 87
 88static const struct i2c_device_id ad7879_id[] = {
 89	{ "ad7879", 0 },
 90	{ "ad7889", 0 },
 91	{ }
 92};
 93MODULE_DEVICE_TABLE(i2c, ad7879_id);
 94
 95#ifdef CONFIG_OF
 96static const struct of_device_id ad7879_i2c_dt_ids[] = {
 97	{ .compatible = "adi,ad7879-1", },
 98	{ }
 99};
100MODULE_DEVICE_TABLE(of, ad7879_i2c_dt_ids);
101#endif
102
103static struct i2c_driver ad7879_i2c_driver = {
104	.driver = {
105		.name	= "ad7879",
106		.pm	= &ad7879_pm_ops,
107		.of_match_table = of_match_ptr(ad7879_i2c_dt_ids),
 
108	},
109	.probe		= ad7879_i2c_probe,
110	.remove		= ad7879_i2c_remove,
111	.id_table	= ad7879_id,
112};
113
114module_i2c_driver(ad7879_i2c_driver);
115
116MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
117MODULE_DESCRIPTION("AD7879(-1) touchscreen I2C bus driver");
118MODULE_LICENSE("GPL");