1 // SPDX-License-Identifier: GPL-2.0
2 
3 #include <linux/device.h>
4 #include <linux/module.h>
5 #include <linux/spi/spi.h>
6 #include <linux/delay.h>
7 
8 #include <drm/drm_mipi_dbi.h>
9 #include <drm/drm_print.h>
10 
11 #include "panel-samsung-s6e63m0.h"
12 
13 static const u8 s6e63m0_dbi_read_commands[] = {
14 	MCS_READ_ID1,
15 	MCS_READ_ID2,
16 	MCS_READ_ID3,
17 	0, /* sentinel */
18 };
19 
20 static int s6e63m0_spi_dcs_read(struct device *dev, void *trsp,
21 				const u8 cmd, u8 *data)
22 {
23 	struct mipi_dbi *dbi = trsp;
24 	int ret;
25 
26 	ret = mipi_dbi_command_read(dbi, cmd, data);
27 	if (ret)
28 		dev_err(dev, "error on DBI read command %02x\n", cmd);
29 
30 	return ret;
31 }
32 
33 static int s6e63m0_spi_dcs_write(struct device *dev, void *trsp,
34 				 const u8 *data, size_t len)
35 {
36 	struct mipi_dbi *dbi = trsp;
37 	int ret;
38 
39 	ret = mipi_dbi_command_stackbuf(dbi, data[0], (data + 1), (len - 1));
40 	usleep_range(300, 310);
41 
42 	return ret;
43 }
44 
45 static int s6e63m0_spi_probe(struct spi_device *spi)
46 {
47 	struct device *dev = &spi->dev;
48 	struct mipi_dbi *dbi;
49 	int ret;
50 
51 	dbi = devm_kzalloc(dev, sizeof(*dbi), GFP_KERNEL);
52 	if (!dbi)
53 		return -ENOMEM;
54 
55 	ret = mipi_dbi_spi_init(spi, dbi, NULL);
56 	if (ret)
57 		return dev_err_probe(dev, ret, "MIPI DBI init failed\n");
58 	/* Register our custom MCS read commands */
59 	dbi->read_commands = s6e63m0_dbi_read_commands;
60 
61 	return s6e63m0_probe(dev, dbi, s6e63m0_spi_dcs_read,
62 			     s6e63m0_spi_dcs_write, false);
63 }
64 
65 static int s6e63m0_spi_remove(struct spi_device *spi)
66 {
67 	return s6e63m0_remove(&spi->dev);
68 }
69 
70 static const struct of_device_id s6e63m0_spi_of_match[] = {
71 	{ .compatible = "samsung,s6e63m0" },
72 	{ /* sentinel */ }
73 };
74 MODULE_DEVICE_TABLE(of, s6e63m0_spi_of_match);
75 
76 static struct spi_driver s6e63m0_spi_driver = {
77 	.probe			= s6e63m0_spi_probe,
78 	.remove			= s6e63m0_spi_remove,
79 	.driver			= {
80 		.name		= "panel-samsung-s6e63m0",
81 		.of_match_table = s6e63m0_spi_of_match,
82 	},
83 };
84 module_spi_driver(s6e63m0_spi_driver);
85 
86 MODULE_AUTHOR("Paweł Chmiel <pawel.mikolaj.chmiel@gmail.com>");
87 MODULE_DESCRIPTION("s6e63m0 LCD SPI Driver");
88 MODULE_LICENSE("GPL v2");
89