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/pm.h>
 
 14
 15#include "ad7879.h"
 16
 17#define AD7879_DEVID		0x79	/* AD7879-1/AD7889-1 */
 18
 19#ifdef CONFIG_PM
 20static int ad7879_i2c_suspend(struct device *dev)
 21{
 22	struct i2c_client *client = to_i2c_client(dev);
 23	struct ad7879 *ts = i2c_get_clientdata(client);
 24
 25	ad7879_suspend(ts);
 26
 27	return 0;
 28}
 29
 30static int ad7879_i2c_resume(struct device *dev)
 31{
 32	struct i2c_client *client = to_i2c_client(dev);
 33	struct ad7879 *ts = i2c_get_clientdata(client);
 34
 35	ad7879_resume(ts);
 36
 37	return 0;
 38}
 39
 40static SIMPLE_DEV_PM_OPS(ad7879_i2c_pm, ad7879_i2c_suspend, ad7879_i2c_resume);
 41#endif
 42
 43/* All registers are word-sized.
 44 * AD7879 uses a high-byte first convention.
 45 */
 46static int ad7879_i2c_read(struct device *dev, u8 reg)
 47{
 48	struct i2c_client *client = to_i2c_client(dev);
 49
 50	return swab16(i2c_smbus_read_word_data(client, reg));
 51}
 52
 53static int ad7879_i2c_multi_read(struct device *dev,
 54				 u8 first_reg, u8 count, u16 *buf)
 55{
 56	struct i2c_client *client = to_i2c_client(dev);
 57	u8 idx;
 58
 59	i2c_smbus_read_i2c_block_data(client, first_reg, count * 2, (u8 *)buf);
 60
 61	for (idx = 0; idx < count; ++idx)
 62		buf[idx] = swab16(buf[idx]);
 63
 64	return 0;
 65}
 66
 67static int ad7879_i2c_write(struct device *dev, u8 reg, u16 val)
 68{
 69	struct i2c_client *client = to_i2c_client(dev);
 70
 71	return i2c_smbus_write_word_data(client, reg, swab16(val));
 72}
 73
 74static const struct ad7879_bus_ops ad7879_i2c_bus_ops = {
 75	.bustype	= BUS_I2C,
 76	.read		= ad7879_i2c_read,
 77	.multi_read	= ad7879_i2c_multi_read,
 78	.write		= ad7879_i2c_write,
 79};
 80
 81static int __devinit ad7879_i2c_probe(struct i2c_client *client,
 82				      const struct i2c_device_id *id)
 83{
 84	struct ad7879 *ts;
 85
 86	if (!i2c_check_functionality(client->adapter,
 87				     I2C_FUNC_SMBUS_WORD_DATA)) {
 88		dev_err(&client->dev, "SMBUS Word Data not Supported\n");
 89		return -EIO;
 90	}
 91
 92	ts = ad7879_probe(&client->dev, AD7879_DEVID, client->irq,
 93			  &ad7879_i2c_bus_ops);
 94	if (IS_ERR(ts))
 95		return PTR_ERR(ts);
 96
 97	i2c_set_clientdata(client, ts);
 98
 99	return 0;
100}
101
102static int __devexit ad7879_i2c_remove(struct i2c_client *client)
103{
104	struct ad7879 *ts = i2c_get_clientdata(client);
105
106	ad7879_remove(ts);
107
108	return 0;
 
109}
110
111static const struct i2c_device_id ad7879_id[] = {
112	{ "ad7879", 0 },
113	{ "ad7889", 0 },
114	{ }
115};
116MODULE_DEVICE_TABLE(i2c, ad7879_id);
117
 
 
 
 
 
 
 
 
118static struct i2c_driver ad7879_i2c_driver = {
119	.driver = {
120		.name	= "ad7879",
121		.owner	= THIS_MODULE,
122#ifdef CONFIG_PM
123		.pm	= &ad7879_i2c_pm,
124#endif
125	},
126	.probe		= ad7879_i2c_probe,
127	.remove		= __devexit_p(ad7879_i2c_remove),
128	.id_table	= ad7879_id,
129};
130
131static int __init ad7879_i2c_init(void)
132{
133	return i2c_add_driver(&ad7879_i2c_driver);
134}
135module_init(ad7879_i2c_init);
136
137static void __exit ad7879_i2c_exit(void)
138{
139	i2c_del_driver(&ad7879_i2c_driver);
140}
141module_exit(ad7879_i2c_exit);
142
143MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
144MODULE_DESCRIPTION("AD7879(-1) touchscreen I2C bus driver");
145MODULE_LICENSE("GPL");
146MODULE_ALIAS("i2c:ad7879");

 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");