1// SPDX-License-Identifier: GPL-2.0-or-later
 2/*
 3 * AD7879/AD7889 touchscreen (SPI bus)
 4 *
 5 * Copyright (C) 2008-2010 Michael Hennerich, Analog Devices Inc.
 
 
 6 */
 7
 8#include <linux/input.h>	/* BUS_SPI */
 9#include <linux/pm.h>
10#include <linux/spi/spi.h>
11#include <linux/module.h>
12#include <linux/of.h>
13#include <linux/regmap.h>
14
15#include "ad7879.h"
16
17#define AD7879_DEVID		0x7A	/* AD7879/AD7889 */
18
19#define MAX_SPI_FREQ_HZ      5000000
20
21#define AD7879_CMD_MAGIC     0xE0
22#define AD7879_CMD_READ      BIT(2)
23
24static const struct regmap_config ad7879_spi_regmap_config = {
25	.reg_bits = 16,
26	.val_bits = 16,
27	.max_register = 15,
28	.read_flag_mask = AD7879_CMD_MAGIC | AD7879_CMD_READ,
29	.write_flag_mask = AD7879_CMD_MAGIC,
30};
31
32static int ad7879_spi_probe(struct spi_device *spi)
33{
34	struct regmap *regmap;
35
36	/* don't exceed max specified SPI CLK frequency */
37	if (spi->max_speed_hz > MAX_SPI_FREQ_HZ) {
38		dev_err(&spi->dev, "SPI CLK %d Hz?\n", spi->max_speed_hz);
39		return -EINVAL;
40	}
41
42	regmap = devm_regmap_init_spi(spi, &ad7879_spi_regmap_config);
43	if (IS_ERR(regmap))
44		return PTR_ERR(regmap);
45
46	return ad7879_probe(&spi->dev, regmap, spi->irq, BUS_SPI, AD7879_DEVID);
47}
48
49#ifdef CONFIG_OF
50static const struct of_device_id ad7879_spi_dt_ids[] = {
51	{ .compatible = "adi,ad7879", },
52	{ }
53};
54MODULE_DEVICE_TABLE(of, ad7879_spi_dt_ids);
55#endif
56
57static struct spi_driver ad7879_spi_driver = {
58	.driver = {
59		.name	= "ad7879",
60		.pm	= &ad7879_pm_ops,
61		.of_match_table = of_match_ptr(ad7879_spi_dt_ids),
62	},
63	.probe		= ad7879_spi_probe,
64};
65
66module_spi_driver(ad7879_spi_driver);
67
68MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
69MODULE_DESCRIPTION("AD7879(-1) touchscreen SPI bus driver");
70MODULE_LICENSE("GPL");
71MODULE_ALIAS("spi:ad7879");

 
 1/*
 2 * AD7879/AD7889 touchscreen (SPI 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_SPI */
10#include <linux/pm.h>
11#include <linux/spi/spi.h>
12#include <linux/module.h>
13#include <linux/of.h>
14#include <linux/regmap.h>
15
16#include "ad7879.h"
17
18#define AD7879_DEVID		0x7A	/* AD7879/AD7889 */
19
20#define MAX_SPI_FREQ_HZ      5000000
21
22#define AD7879_CMD_MAGIC     0xE0
23#define AD7879_CMD_READ      BIT(2)
24
25static const struct regmap_config ad7879_spi_regmap_config = {
26	.reg_bits = 16,
27	.val_bits = 16,
28	.max_register = 15,
29	.read_flag_mask = AD7879_CMD_MAGIC | AD7879_CMD_READ,
30	.write_flag_mask = AD7879_CMD_MAGIC,
31};
32
33static int ad7879_spi_probe(struct spi_device *spi)
34{
35	struct regmap *regmap;
36
37	/* don't exceed max specified SPI CLK frequency */
38	if (spi->max_speed_hz > MAX_SPI_FREQ_HZ) {
39		dev_err(&spi->dev, "SPI CLK %d Hz?\n", spi->max_speed_hz);
40		return -EINVAL;
41	}
42
43	regmap = devm_regmap_init_spi(spi, &ad7879_spi_regmap_config);
44	if (IS_ERR(regmap))
45		return PTR_ERR(regmap);
46
47	return ad7879_probe(&spi->dev, regmap, spi->irq, BUS_SPI, AD7879_DEVID);
48}
49
50#ifdef CONFIG_OF
51static const struct of_device_id ad7879_spi_dt_ids[] = {
52	{ .compatible = "adi,ad7879", },
53	{ }
54};
55MODULE_DEVICE_TABLE(of, ad7879_spi_dt_ids);
56#endif
57
58static struct spi_driver ad7879_spi_driver = {
59	.driver = {
60		.name	= "ad7879",
61		.pm	= &ad7879_pm_ops,
62		.of_match_table = of_match_ptr(ad7879_spi_dt_ids),
63	},
64	.probe		= ad7879_spi_probe,
65};
66
67module_spi_driver(ad7879_spi_driver);
68
69MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
70MODULE_DESCRIPTION("AD7879(-1) touchscreen SPI bus driver");
71MODULE_LICENSE("GPL");
72MODULE_ALIAS("spi:ad7879");