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_info(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_info(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_info(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");
139