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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/input/touchscreen/ad7879-spi.c | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/input/touchscreen/ad7879-spi.c')
-rw-r--r-- | drivers/input/touchscreen/ad7879-spi.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/ad7879-spi.c b/drivers/input/touchscreen/ad7879-spi.c new file mode 100644 index 000000000..50e889846 --- /dev/null +++ b/drivers/input/touchscreen/ad7879-spi.c @@ -0,0 +1,71 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * AD7879/AD7889 touchscreen (SPI bus) + * + * Copyright (C) 2008-2010 Michael Hennerich, Analog Devices Inc. + */ + +#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); +} + +#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"); |