99 lines
2.4 KiB
C
99 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2025 Pengutronix
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*
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* Author: Steffen Trumtrar <kernel@pengutronix.de>
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/spi/spi.h>
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#include "leds-lp5860.h"
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#define LP5860_SPI_WRITE_FLAG BIT(13)
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/*
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* The lp5860 uses a rather uncommon SPI data format: The R/W flag is on BIT(5) in the two address
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* bytes; BIT(4) to BIT(0) are don't care. Therefore it has 10 bits for the address and 6 bits for
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* padding the address. The address bytes are sent MSB first. Matching the cores registers to regmap
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* results in write_flag_mask being BIT(13).
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*/
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static const struct regmap_config lp5860_regmap_config = {
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.name = "lp5860",
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.reg_bits = 10,
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.pad_bits = 6,
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.val_bits = 8,
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.write_flag_mask = LP5860_SPI_WRITE_FLAG,
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.reg_format_endian = REGMAP_ENDIAN_BIG,
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.max_register = LP5860_MAX_REG,
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};
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static int lp5860_probe(struct spi_device *spi)
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{
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struct device *dev = &spi->dev;
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struct lp5860 *lp5860;
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unsigned int multi_leds;
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multi_leds = device_get_child_node_count(dev);
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if (!multi_leds) {
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dev_err(dev, "LEDs are not defined in Device Tree!");
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return -ENODEV;
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}
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if (multi_leds > LP5860_MAX_LED) {
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dev_err(dev, "Too many LEDs specified.\n");
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return -EINVAL;
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}
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lp5860 = devm_kzalloc(dev, struct_size(lp5860, leds, multi_leds),
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GFP_KERNEL);
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if (!lp5860)
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return -ENOMEM;
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lp5860->regmap = devm_regmap_init_spi(spi, &lp5860_regmap_config);
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if (IS_ERR(lp5860->regmap))
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return dev_err_probe(&spi->dev, PTR_ERR(lp5860->regmap),
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"Failed to initialise Regmap.\n");
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lp5860->dev = dev;
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mutex_init(&lp5860->lock);
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spi_set_drvdata(spi, lp5860);
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return lp5860_device_init(dev);
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}
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static void lp5860_remove(struct spi_device *spi)
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{
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struct lp5860 *lp5860 = spi_get_drvdata(spi);
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mutex_destroy(&lp5860->lock);
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lp5860_device_remove(&spi->dev);
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}
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static const struct of_device_id lp5860_of_match[] = {
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{ .compatible = "ti,lp5860" },
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{}
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};
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MODULE_DEVICE_TABLE(of, lp5860_of_match);
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static struct spi_driver lp5860_driver = {
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.driver = {
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.name = "lp5860-spi",
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.of_match_table = lp5860_of_match,
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},
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.probe = lp5860_probe,
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.remove = lp5860_remove,
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};
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module_spi_driver(lp5860_driver);
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MODULE_AUTHOR("Steffen Trumtrar <kernel@pengutronix.de>");
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MODULE_DESCRIPTION("TI LP5860 RGB LED SPI driver");
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MODULE_LICENSE("GPL");
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