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// SPDX-License-Identifier: GPL-2.0
#include <linux/device.h>
#include <linux/module.h>
#include <linux/spi/spi.h>
#include <linux/delay.h>
#include <drm/drm_print.h>
#include "panel-samsung-s6e63m0.h"
#define DATA_MASK 0x100
static int s6e63m0_spi_dcs_read(struct device *dev, const u8 cmd, u8 *data)
{
struct spi_device *spi = to_spi_device(dev);
u16 buf[1];
u16 rbuf[1];
int ret;
/* SPI buffers are always in CPU order */
buf[0] = (u16)cmd;
ret = spi_write_then_read(spi, buf, 2, rbuf, 2);
dev_dbg(dev, "READ CMD: %04x RET: %04x\n", buf[0], rbuf[0]);
if (!ret)
/* These high 8 bits of the 9 contains the readout */
*data = (rbuf[0] & 0x1ff) >> 1;
return ret;
}
static int s6e63m0_spi_write_word(struct device *dev, u16 data)
{
struct spi_device *spi = to_spi_device(dev);
/* SPI buffers are always in CPU order */
return spi_write(spi, &data, 2);
}
static int s6e63m0_spi_dcs_write(struct device *dev, const u8 *data, size_t len)
{
int ret = 0;
dev_dbg(dev, "SPI writing dcs seq: %*ph\n", (int)len, data);
/*
* This sends 9 bits with the first bit (bit 8) set to 0
* This indicates that this is a command. Anything after the
* command is data.
*/
ret = s6e63m0_spi_write_word(dev, *data);
while (!ret && --len) {
++data;
/* This sends 9 bits with the first bit (bit 8) set to 1 */
ret = s6e63m0_spi_write_word(dev, *data | DATA_MASK);
}
if (ret) {
dev_err(dev, "SPI error %d writing dcs seq: %*ph\n", ret,
(int)len, data);
}
usleep_range(300, 310);
return ret;
}
static int s6e63m0_spi_probe(struct spi_device *spi)
{
struct device *dev = &spi->dev;
int ret;
spi->bits_per_word = 9;
/* Preserve e.g. SPI_3WIRE setting */
spi->mode |= SPI_MODE_3;
ret = spi_setup(spi);
if (ret < 0) {
dev_err(dev, "spi setup failed.\n");
return ret;
}
return s6e63m0_probe(dev, s6e63m0_spi_dcs_read, s6e63m0_spi_dcs_write,
false);
}
static int s6e63m0_spi_remove(struct spi_device *spi)
{
return s6e63m0_remove(&spi->dev);
}
static const struct of_device_id s6e63m0_spi_of_match[] = {
{ .compatible = "samsung,s6e63m0" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, s6e63m0_spi_of_match);
static struct spi_driver s6e63m0_spi_driver = {
.probe = s6e63m0_spi_probe,
.remove = s6e63m0_spi_remove,
.driver = {
.name = "panel-samsung-s6e63m0",
.of_match_table = s6e63m0_spi_of_match,
},
};
module_spi_driver(s6e63m0_spi_driver);
MODULE_AUTHOR("Paweł Chmiel <pawel.mikolaj.chmiel@gmail.com>");
MODULE_DESCRIPTION("s6e63m0 LCD SPI Driver");
MODULE_LICENSE("GPL v2");
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