93 lines
2.0 KiB
C
93 lines
2.0 KiB
C
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/*
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* TI LP88XX SPI Backlight Driver
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*
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* Copyright 2016 Texas Instruments
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/slab.h>
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#include <linux/spi/spi.h>
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#include "lp88xx.h"
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#define LP88XX_SPI_READ(reg) ((reg << 1) & 0x7ffe)
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#define LP88XX_SPI_WRITE(reg) ((reg << 1) | BIT(0))
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static int lp88xx_reg_read(void *p, u16 reg, u16 *val)
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{
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struct spi_device *spi = p;
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u16 cmd = LP88XX_SPI_READ(reg);
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return spi_write_then_read(spi, &cmd, 2, val, 2);
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}
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static int lp88xx_reg_write(void *p, u16 reg, u16 val)
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{
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struct spi_device *spi = p;
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u16 cmd[2];
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cmd[0] = LP88XX_SPI_WRITE(reg);
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cmd[1] = val;
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return spi_write(spi, (const u16 *)&cmd, 4);
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}
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static int lp88xx_probe(struct spi_device *spi)
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{
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struct lp88xx *lp;
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struct device *dev = &spi->dev;
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int ret;
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lp = devm_kzalloc(dev, sizeof(struct lp88xx), GFP_KERNEL);
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if (!lp)
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return -ENOMEM;
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lp->dev = dev;
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lp->priv = spi;
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lp->io.write = lp88xx_reg_write;
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lp->io.read = lp88xx_reg_read;
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spi_set_drvdata(spi, lp);
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spi->bits_per_word = 16;
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ret = spi_setup(spi);
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if (ret) {
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dev_err(dev, "Failed to setup SPI: %d\n", ret);
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return ret;
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}
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return lp88xx_common_probe(dev, lp);
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}
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static const struct of_device_id lp88xx_dt_ids[] = {
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{ .compatible = "ti,lp8580", },
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{ .compatible = "ti,lp8880", },
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{ }
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};
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MODULE_DEVICE_TABLE(of, lp88xx_dt_ids);
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static const struct spi_device_id lp88xx_ids[] = {
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{ "lp88xx", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(spi, lp88xx_ids);
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static struct spi_driver lp88xx_driver = {
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.driver = {
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.name = "lp88xx",
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.of_match_table = of_match_ptr(lp88xx_dt_ids),
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},
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.probe = lp88xx_probe,
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.id_table = lp88xx_ids,
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};
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module_spi_driver(lp88xx_driver);
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MODULE_DESCRIPTION("Texas Instruments LP88XX SPI Backlight driver");
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MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
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MODULE_LICENSE("GPL v2");
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