Release 4.16 drivers/input/touchscreen/ad7879-spi.c

/*
 * AD7879/AD7889 touchscreen (SPI bus)
 *
 * Copyright (C) 2008-2010 Michael Hennerich, Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later.
 */

#include <linux/input.h>	/* BUS_SPI */
#include <linux/pm.h>
#include <linux/spi/spi.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/regmap.h>

#include "ad7879.h"


#define AD7879_DEVID		0x7A	
/* AD7879/AD7889 */


#define MAX_SPI_FREQ_HZ      5000000


#define AD7879_CMD_MAGIC     0xE0

#define AD7879_CMD_READ      BIT(2)


static const struct regmap_config ad7879_spi_regmap_config = {
	.reg_bits = 16,
	.val_bits = 16,
	.max_register = 15,
	.read_flag_mask = AD7879_CMD_MAGIC | AD7879_CMD_READ,
	.write_flag_mask = AD7879_CMD_MAGIC,
};



static int ad7879_spi_probe(struct spi_device *spi)
{
	struct regmap *regmap;

	/* don't exceed max specified SPI CLK frequency */
	if (spi->max_speed_hz > MAX_SPI_FREQ_HZ) {
		dev_err(&spi->dev, "SPI CLK %d Hz?\n", spi->max_speed_hz);
		return -EINVAL;
	}

	regmap = devm_regmap_init_spi(spi, &ad7879_spi_regmap_config);
	if (IS_ERR(regmap))
		return PTR_ERR(regmap);

	return ad7879_probe(&spi->dev, regmap, spi->irq, BUS_SPI, AD7879_DEVID);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Mike Frysinger
55
63.22%
1
33.33%
Dmitry Torokhov
32
36.78%
2
66.67%
Total
87
100.00%
3
100.00%

#ifdef CONFIG_OF

static const struct of_device_id ad7879_spi_dt_ids[] = {
	{ .compatible = "adi,ad7879", },
	{ }
};
MODULE_DEVICE_TABLE(of, ad7879_spi_dt_ids);
#endif


static struct spi_driver ad7879_spi_driver = {
	.driver = {
		.name	= "ad7879",
		.pm	= &ad7879_pm_ops,
		.of_match_table = of_match_ptr(ad7879_spi_dt_ids),
        },
	.probe		= ad7879_spi_probe,
};

module_spi_driver(ad7879_spi_driver);

MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
MODULE_DESCRIPTION("AD7879(-1) touchscreen SPI bus driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("spi:ad7879");
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Mike Frysinger
146
57.71%
1
11.11%
Dmitry Torokhov
55
21.74%
3
33.33%
Stefan Agner
41
16.21%
1
11.11%
Mark Brown
6
2.37%
1
11.11%
Paul Gortmaker
3
1.19%
1
11.11%
Michael Hennerich
1
0.40%
1
11.11%
Axel Lin
1
0.40%
1
11.11%
Total
253
100.00%
9
100.00%
Directory: drivers/input/touchscreen

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