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// SPDX-License-Identifier: GPL-2.0
/*
* DSI interface to the Samsung S6E63M0 panel.
* (C) 2019 Linus Walleij
*/
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/of_device.h>
#include <drm/drm_mipi_dsi.h>
#include <drm/drm_print.h>
#include "panel-samsung-s6e63m0.h"
#define MCS_GLOBAL_PARAM 0xb0
#define S6E63M0_DSI_MAX_CHUNK 15 /* CMD + 15 bytes max */
static int s6e63m0_dsi_dcs_read(struct device *dev, const u8 cmd, u8 *data)
{
struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
int ret;
ret = mipi_dsi_dcs_read(dsi, cmd, data, 1);
if (ret < 0) {
dev_err(dev, "could not read DCS CMD %02x\n", cmd);
return ret;
}
dev_info(dev, "DSI read CMD %02x = %02x\n", cmd, *data);
return 0;
}
static int s6e63m0_dsi_dcs_write(struct device *dev, const u8 *data, size_t len)
{
struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
const u8 *seqp = data;
u8 cmd;
u8 cmdwritten;
int remain;
int chunk;
int ret;
dev_info(dev, "DSI writing dcs seq: %*ph\n", (int)len, data);
/* Pick out and skip past the DCS command */
cmd = *seqp;
seqp++;
cmdwritten = 0;
remain = len - 1;
chunk = remain;
/* Send max S6E63M0_DSI_MAX_CHUNK bytes at a time */
if (chunk > S6E63M0_DSI_MAX_CHUNK)
chunk = S6E63M0_DSI_MAX_CHUNK;
ret = mipi_dsi_dcs_write(dsi, cmd, seqp, chunk);
if (ret < 0) {
dev_err(dev, "error sending DCS command seq cmd %02x\n", cmd);
return ret;
}
cmdwritten += chunk;
seqp += chunk;
while (cmdwritten < remain) {
chunk = remain - cmdwritten;
if (chunk > S6E63M0_DSI_MAX_CHUNK)
chunk = S6E63M0_DSI_MAX_CHUNK;
ret = mipi_dsi_dcs_write(dsi, MCS_GLOBAL_PARAM, &cmdwritten, 1);
if (ret < 0) {
dev_err(dev, "error sending CMD %02x global param %02x\n",
cmd, cmdwritten);
return ret;
}
ret = mipi_dsi_dcs_write(dsi, cmd, seqp, chunk);
if (ret < 0) {
dev_err(dev, "error sending CMD %02x chunk\n", cmd);
return ret;
}
cmdwritten += chunk;
seqp += chunk;
}
dev_info(dev, "sent command %02x %02x bytes\n", cmd, cmdwritten);
usleep_range(8000, 9000);
return 0;
}
static int s6e63m0_dsi_probe(struct mipi_dsi_device *dsi)
{
struct device *dev = &dsi->dev;
int ret;
dsi->lanes = 2;
dsi->format = MIPI_DSI_FMT_RGB888;
dsi->hs_rate = 349440000;
dsi->lp_rate = 9600000;
dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
MIPI_DSI_MODE_EOT_PACKET |
MIPI_DSI_MODE_VIDEO_BURST;
ret = s6e63m0_probe(dev, s6e63m0_dsi_dcs_read, s6e63m0_dsi_dcs_write,
true);
if (ret)
return ret;
ret = mipi_dsi_attach(dsi);
if (ret < 0)
s6e63m0_remove(dev);
return ret;
}
static int s6e63m0_dsi_remove(struct mipi_dsi_device *dsi)
{
mipi_dsi_detach(dsi);
return s6e63m0_remove(&dsi->dev);
}
static const struct of_device_id s6e63m0_dsi_of_match[] = {
{ .compatible = "samsung,s6e63m0" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, s6e63m0_dsi_of_match);
static struct mipi_dsi_driver s6e63m0_dsi_driver = {
.probe = s6e63m0_dsi_probe,
.remove = s6e63m0_dsi_remove,
.driver = {
.name = "panel-samsung-s6e63m0",
.of_match_table = s6e63m0_dsi_of_match,
},
};
module_mipi_dsi_driver(s6e63m0_dsi_driver);
MODULE_AUTHOR("Linus Walleij <linusw@kernel.org>");
MODULE_DESCRIPTION("s6e63m0 LCD DSI Driver");
MODULE_LICENSE("GPL v2");
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