// SPDX-License-Identifier: GPL-2.0
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/spi/spi.h>
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#include <linux/delay.h>
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#include <drm/drm_print.h>
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#include "panel-samsung-s6e63m0.h"
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#define DATA_MASK 0x100
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static int s6e63m0_spi_dcs_read(struct device *dev, const u8 cmd, u8 *data)
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{
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/*
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* FIXME: implement reading DCS commands over SPI so we can
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* properly identify which physical panel is connected.
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*/
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*data = 0;
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return 0;
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}
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static int s6e63m0_spi_write_word(struct device *dev, u16 data)
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{
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struct spi_device *spi = to_spi_device(dev);
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struct spi_transfer xfer = {
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.len = 2,
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.tx_buf = &data,
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};
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struct spi_message msg;
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spi_message_init(&msg);
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spi_message_add_tail(&xfer, &msg);
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return spi_sync(spi, &msg);
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}
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static int s6e63m0_spi_dcs_write(struct device *dev, const u8 *data, size_t len)
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{
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int ret = 0;
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dev_dbg(dev, "SPI writing dcs seq: %*ph\n", (int)len, data);
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ret = s6e63m0_spi_write_word(dev, *data);
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while (!ret && --len) {
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++data;
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ret = s6e63m0_spi_write_word(dev, *data | DATA_MASK);
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}
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if (ret) {
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dev_err(dev, "SPI error %d writing dcs seq: %*ph\n", ret,
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(int)len, data);
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}
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usleep_range(300, 310);
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return ret;
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}
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static int s6e63m0_spi_probe(struct spi_device *spi)
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{
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struct device *dev = &spi->dev;
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int ret;
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spi->bits_per_word = 9;
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spi->mode = SPI_MODE_3;
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ret = spi_setup(spi);
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if (ret < 0) {
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dev_err(dev, "spi setup failed.\n");
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return ret;
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}
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return s6e63m0_probe(dev, s6e63m0_spi_dcs_read, s6e63m0_spi_dcs_write,
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false);
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}
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static int s6e63m0_spi_remove(struct spi_device *spi)
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{
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return s6e63m0_remove(&spi->dev);
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}
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static const struct of_device_id s6e63m0_spi_of_match[] = {
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{ .compatible = "samsung,s6e63m0" },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, s6e63m0_spi_of_match);
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static struct spi_driver s6e63m0_spi_driver = {
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.probe = s6e63m0_spi_probe,
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.remove = s6e63m0_spi_remove,
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.driver = {
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.name = "panel-samsung-s6e63m0",
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.of_match_table = s6e63m0_spi_of_match,
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},
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};
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module_spi_driver(s6e63m0_spi_driver);
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MODULE_AUTHOR("Paweł Chmiel <pawel.mikolaj.chmiel@gmail.com>");
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MODULE_DESCRIPTION("s6e63m0 LCD SPI Driver");
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MODULE_LICENSE("GPL v2");
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