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71 lines
1.7 KiB
71 lines
1.7 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* AD7879/AD7889 touchscreen (SPI bus) |
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* |
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* Copyright (C) 2008-2010 Michael Hennerich, Analog Devices Inc. |
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*/ |
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#include <linux/input.h> /* BUS_SPI */ |
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#include <linux/pm.h> |
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#include <linux/spi/spi.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/regmap.h> |
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#include "ad7879.h" |
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#define AD7879_DEVID 0x7A /* AD7879/AD7889 */ |
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#define MAX_SPI_FREQ_HZ 5000000 |
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#define AD7879_CMD_MAGIC 0xE0 |
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#define AD7879_CMD_READ BIT(2) |
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static const struct regmap_config ad7879_spi_regmap_config = { |
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.reg_bits = 16, |
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.val_bits = 16, |
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.max_register = 15, |
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.read_flag_mask = AD7879_CMD_MAGIC | AD7879_CMD_READ, |
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.write_flag_mask = AD7879_CMD_MAGIC, |
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}; |
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static int ad7879_spi_probe(struct spi_device *spi) |
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{ |
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struct regmap *regmap; |
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/* don't exceed max specified SPI CLK frequency */ |
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if (spi->max_speed_hz > MAX_SPI_FREQ_HZ) { |
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dev_err(&spi->dev, "SPI CLK %d Hz?\n", spi->max_speed_hz); |
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return -EINVAL; |
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} |
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regmap = devm_regmap_init_spi(spi, &ad7879_spi_regmap_config); |
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if (IS_ERR(regmap)) |
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return PTR_ERR(regmap); |
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return ad7879_probe(&spi->dev, regmap, spi->irq, BUS_SPI, AD7879_DEVID); |
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} |
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#ifdef CONFIG_OF |
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static const struct of_device_id ad7879_spi_dt_ids[] = { |
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{ .compatible = "adi,ad7879", }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(of, ad7879_spi_dt_ids); |
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#endif |
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static struct spi_driver ad7879_spi_driver = { |
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.driver = { |
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.name = "ad7879", |
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.pm = &ad7879_pm_ops, |
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.of_match_table = of_match_ptr(ad7879_spi_dt_ids), |
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}, |
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.probe = ad7879_spi_probe, |
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}; |
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module_spi_driver(ad7879_spi_driver); |
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MODULE_AUTHOR("Michael Hennerich <[email protected]>"); |
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MODULE_DESCRIPTION("AD7879(-1) touchscreen SPI bus driver"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("spi:ad7879");
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