1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * DSI interface to the Samsung S6E63M0 panel.
  4 * (C) 2019 Linus Walleij
  5 */
  6
  7#include <linux/module.h>
  8#include <linux/delay.h>
  9#include <linux/of_device.h>
 10
 11#include <drm/drm_mipi_dsi.h>
 12#include <drm/drm_print.h>
 13
 14#include "panel-samsung-s6e63m0.h"
 15
 16#define MCS_GLOBAL_PARAM	0xb0
 17#define S6E63M0_DSI_MAX_CHUNK	15 /* CMD + 15 bytes max */
 18
 19static int s6e63m0_dsi_dcs_read(struct device *dev, const u8 cmd, u8 *data)
 20{
 21	struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
 22	int ret;
 23
 24	ret = mipi_dsi_dcs_read(dsi, cmd, data, 1);
 25	if (ret < 0) {
 26		dev_err(dev, "could not read DCS CMD %02x\n", cmd);
 27		return ret;
 28	}
 29
 30	dev_dbg(dev, "DSI read CMD %02x = %02x\n", cmd, *data);
 31
 32	return 0;
 33}
 34
 35static int s6e63m0_dsi_dcs_write(struct device *dev, const u8 *data, size_t len)
 36{
 37	struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
 38	const u8 *seqp = data;
 39	u8 cmd;
 40	u8 cmdwritten;
 41	int remain;
 42	int chunk;
 43	int ret;
 44
 45	dev_dbg(dev, "DSI writing dcs seq: %*ph\n", (int)len, data);
 46
 47	/* Pick out and skip past the DCS command */
 48	cmd = *seqp;
 49	seqp++;
 50	cmdwritten = 0;
 51	remain = len - 1;
 52	chunk = remain;
 53
 54	/* Send max S6E63M0_DSI_MAX_CHUNK bytes at a time */
 55	if (chunk > S6E63M0_DSI_MAX_CHUNK)
 56		chunk = S6E63M0_DSI_MAX_CHUNK;
 57	ret = mipi_dsi_dcs_write(dsi, cmd, seqp, chunk);
 58	if (ret < 0) {
 59		dev_err(dev, "error sending DCS command seq cmd %02x\n", cmd);
 60		return ret;
 61	}
 62	cmdwritten += chunk;
 63	seqp += chunk;
 64
 65	while (cmdwritten < remain) {
 66		chunk = remain - cmdwritten;
 67		if (chunk > S6E63M0_DSI_MAX_CHUNK)
 68			chunk = S6E63M0_DSI_MAX_CHUNK;
 69		ret = mipi_dsi_dcs_write(dsi, MCS_GLOBAL_PARAM, &cmdwritten, 1);
 70		if (ret < 0) {
 71			dev_err(dev, "error sending CMD %02x global param %02x\n",
 72				cmd, cmdwritten);
 73			return ret;
 74		}
 75		ret = mipi_dsi_dcs_write(dsi, cmd, seqp, chunk);
 76		if (ret < 0) {
 77			dev_err(dev, "error sending CMD %02x chunk\n", cmd);
 78			return ret;
 79		}
 80		cmdwritten += chunk;
 81		seqp += chunk;
 82	}
 83	dev_dbg(dev, "sent command %02x %02x bytes\n", cmd, cmdwritten);
 84
 85	usleep_range(8000, 9000);
 86
 87	return 0;
 88}
 89
 90static int s6e63m0_dsi_probe(struct mipi_dsi_device *dsi)
 91{
 92	struct device *dev = &dsi->dev;
 93	int ret;
 94
 95	dsi->lanes = 2;
 96	dsi->format = MIPI_DSI_FMT_RGB888;
 97	dsi->hs_rate = 349440000;
 98	dsi->lp_rate = 9600000;
 99	dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
100		MIPI_DSI_MODE_VIDEO_BURST;
101
102	ret = s6e63m0_probe(dev, s6e63m0_dsi_dcs_read, s6e63m0_dsi_dcs_write,
103			    true);
104	if (ret)
105		return ret;
106
107	ret = mipi_dsi_attach(dsi);
108	if (ret < 0)
109		s6e63m0_remove(dev);
110
111	return ret;
112}
113
114static int s6e63m0_dsi_remove(struct mipi_dsi_device *dsi)
115{
116	mipi_dsi_detach(dsi);
117	return s6e63m0_remove(&dsi->dev);
118}
119
120static const struct of_device_id s6e63m0_dsi_of_match[] = {
121	{ .compatible = "samsung,s6e63m0" },
122	{ /* sentinel */ }
123};
124MODULE_DEVICE_TABLE(of, s6e63m0_dsi_of_match);
125
126static struct mipi_dsi_driver s6e63m0_dsi_driver = {
127	.probe			= s6e63m0_dsi_probe,
128	.remove			= s6e63m0_dsi_remove,
129	.driver			= {
130		.name		= "panel-samsung-s6e63m0",
131		.of_match_table = s6e63m0_dsi_of_match,
132	},
133};
134module_mipi_dsi_driver(s6e63m0_dsi_driver);
135
136MODULE_AUTHOR("Linus Walleij <linusw@kernel.org>");
137MODULE_DESCRIPTION("s6e63m0 LCD DSI Driver");
138MODULE_LICENSE("GPL v2");