Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * AD7879/AD7889 touchscreen (SPI bus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * Copyright (C) 2008-2010 Michael Hennerich, Analog Devices Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #include <linux/input.h>	/* BUS_SPI */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <linux/pm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/spi/spi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/regmap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include "ad7879.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #define AD7879_DEVID		0x7A	/* AD7879/AD7889 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #define MAX_SPI_FREQ_HZ      5000000
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #define AD7879_CMD_MAGIC     0xE0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #define AD7879_CMD_READ      BIT(2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) static const struct regmap_config ad7879_spi_regmap_config = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	.reg_bits = 16,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 	.val_bits = 16,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	.max_register = 15,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	.read_flag_mask = AD7879_CMD_MAGIC | AD7879_CMD_READ,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	.write_flag_mask = AD7879_CMD_MAGIC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) static int ad7879_spi_probe(struct spi_device *spi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	struct regmap *regmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 	/* don't exceed max specified SPI CLK frequency */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	if (spi->max_speed_hz > MAX_SPI_FREQ_HZ) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 		dev_err(&spi->dev, "SPI CLK %d Hz?\n", spi->max_speed_hz);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	regmap = devm_regmap_init_spi(spi, &ad7879_spi_regmap_config);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	if (IS_ERR(regmap))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 		return PTR_ERR(regmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	return ad7879_probe(&spi->dev, regmap, spi->irq, BUS_SPI, AD7879_DEVID);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) #ifdef CONFIG_OF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) static const struct of_device_id ad7879_spi_dt_ids[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 	{ .compatible = "adi,ad7879", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 	{ }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) MODULE_DEVICE_TABLE(of, ad7879_spi_dt_ids);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) static struct spi_driver ad7879_spi_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 	.driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 		.name	= "ad7879",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 		.pm	= &ad7879_pm_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 		.of_match_table = of_match_ptr(ad7879_spi_dt_ids),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 	.probe		= ad7879_spi_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) module_spi_driver(ad7879_spi_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) MODULE_DESCRIPTION("AD7879(-1) touchscreen SPI bus driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) MODULE_ALIAS("spi:ad7879");