1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * NEC NL8048HL11 Panel Driver
4 *
5 * Copyright (C) 2019 Texas Instruments Incorporated
6 *
7 * Based on the omapdrm-specific panel-nec-nl8048hl11 driver
8 *
9 * Copyright (C) 2010 Texas Instruments Incorporated
10 * Author: Erik Gilling <konkers@android.com>
11 */
12
13#include <linux/delay.h>
14#include <linux/gpio/consumer.h>
15#include <linux/module.h>
16#include <linux/pm.h>
17#include <linux/spi/spi.h>
18
19#include <drm/drm_connector.h>
20#include <drm/drm_modes.h>
21#include <drm/drm_panel.h>
22
23struct nl8048_panel {
24	struct drm_panel panel;
25
26	struct spi_device *spi;
27	struct gpio_desc *reset_gpio;
28};
29
30#define to_nl8048_device(p) container_of(p, struct nl8048_panel, panel)
31
32static int nl8048_write(struct nl8048_panel *lcd, unsigned char addr,
33			unsigned char value)
34{
35	u8 data[4] = { value, 0x01, addr, 0x00 };
36	int ret;
37
38	ret = spi_write(lcd->spi, data, sizeof(data));
39	if (ret)
40		dev_err(&lcd->spi->dev, "SPI write to %u failed: %d\n",
41			addr, ret);
42
43	return ret;
44}
45
46static int nl8048_init(struct nl8048_panel *lcd)
47{
48	static const struct {
49		unsigned char addr;
50		unsigned char data;
51	} nl8048_init_seq[] = {
52		{   3, 0x01 }, {   0, 0x00 }, {   1, 0x01 }, {   4, 0x00 },
53		{   5, 0x14 }, {   6, 0x24 }, {  16, 0xd7 }, {  17, 0x00 },
54		{  18, 0x00 }, {  19, 0x55 }, {  20, 0x01 }, {  21, 0x70 },
55		{  22, 0x1e }, {  23, 0x25 }, {  24, 0x25 }, {  25, 0x02 },
56		{  26, 0x02 }, {  27, 0xa0 }, {  32, 0x2f }, {  33, 0x0f },
57		{  34, 0x0f }, {  35, 0x0f }, {  36, 0x0f }, {  37, 0x0f },
58		{  38, 0x0f }, {  39, 0x00 }, {  40, 0x02 }, {  41, 0x02 },
59		{  42, 0x02 }, {  43, 0x0f }, {  44, 0x0f }, {  45, 0x0f },
60		{  46, 0x0f }, {  47, 0x0f }, {  48, 0x0f }, {  49, 0x0f },
61		{  50, 0x00 }, {  51, 0x02 }, {  52, 0x02 }, {  53, 0x02 },
62		{  80, 0x0c }, {  83, 0x42 }, {  84, 0x42 }, {  85, 0x41 },
63		{  86, 0x14 }, {  89, 0x88 }, {  90, 0x01 }, {  91, 0x00 },
64		{  92, 0x02 }, {  93, 0x0c }, {  94, 0x1c }, {  95, 0x27 },
65		{  98, 0x49 }, {  99, 0x27 }, { 102, 0x76 }, { 103, 0x27 },
66		{ 112, 0x01 }, { 113, 0x0e }, { 114, 0x02 }, { 115, 0x0c },
67		{ 118, 0x0c }, { 121, 0x30 }, { 130, 0x00 }, { 131, 0x00 },
68		{ 132, 0xfc }, { 134, 0x00 }, { 136, 0x00 }, { 138, 0x00 },
69		{ 139, 0x00 }, { 140, 0x00 }, { 141, 0xfc }, { 143, 0x00 },
70		{ 145, 0x00 }, { 147, 0x00 }, { 148, 0x00 }, { 149, 0x00 },
71		{ 150, 0xfc }, { 152, 0x00 }, { 154, 0x00 }, { 156, 0x00 },
72		{ 157, 0x00 },
73	};
74
75	unsigned int i;
76	int ret;
77
78	for (i = 0; i < ARRAY_SIZE(nl8048_init_seq); ++i) {
79		ret = nl8048_write(lcd, nl8048_init_seq[i].addr,
80				   nl8048_init_seq[i].data);
81		if (ret < 0)
82			return ret;
83	}
84
85	udelay(20);
86
87	return nl8048_write(lcd, 2, 0x00);
88}
89
90static int nl8048_disable(struct drm_panel *panel)
91{
92	struct nl8048_panel *lcd = to_nl8048_device(panel);
93
94	gpiod_set_value_cansleep(lcd->reset_gpio, 0);
95
96	return 0;
97}
98
99static int nl8048_enable(struct drm_panel *panel)
100{
101	struct nl8048_panel *lcd = to_nl8048_device(panel);
102
103	gpiod_set_value_cansleep(lcd->reset_gpio, 1);
104
105	return 0;
106}
107
108static const struct drm_display_mode nl8048_mode = {
109	/*  NEC PIX Clock Ratings MIN:21.8MHz TYP:23.8MHz MAX:25.7MHz */
110	.clock	= 23800,
111	.hdisplay = 800,
112	.hsync_start = 800 + 6,
113	.hsync_end = 800 + 6 + 1,
114	.htotal = 800 + 6 + 1 + 4,
115	.vdisplay = 480,
116	.vsync_start = 480 + 3,
117	.vsync_end = 480 + 3 + 1,
118	.vtotal = 480 + 3 + 1 + 4,
119	.type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
120	.flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
121	.width_mm = 89,
122	.height_mm = 53,
123};
124
125static int nl8048_get_modes(struct drm_panel *panel,
126			    struct drm_connector *connector)
127{
128	struct drm_display_mode *mode;
129
130	mode = drm_mode_duplicate(connector->dev, &nl8048_mode);
131	if (!mode)
132		return -ENOMEM;
133
134	drm_mode_set_name(mode);
135	drm_mode_probed_add(connector, mode);
136
137	connector->display_info.width_mm = nl8048_mode.width_mm;
138	connector->display_info.height_mm = nl8048_mode.height_mm;
139	connector->display_info.bus_flags = DRM_BUS_FLAG_DE_HIGH
140					  | DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE
141					  | DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE;
142
143	return 1;
144}
145
146static const struct drm_panel_funcs nl8048_funcs = {
147	.disable = nl8048_disable,
148	.enable = nl8048_enable,
149	.get_modes = nl8048_get_modes,
150};
151
152static int __maybe_unused nl8048_suspend(struct device *dev)
153{
154	struct nl8048_panel *lcd = dev_get_drvdata(dev);
155
156	nl8048_write(lcd, 2, 0x01);
157	msleep(40);
158
159	return 0;
160}
161
162static int __maybe_unused nl8048_resume(struct device *dev)
163{
164	struct nl8048_panel *lcd = dev_get_drvdata(dev);
165
166	/* Reinitialize the panel. */
167	spi_setup(lcd->spi);
168	nl8048_write(lcd, 2, 0x00);
169	nl8048_init(lcd);
170
171	return 0;
172}
173
174static SIMPLE_DEV_PM_OPS(nl8048_pm_ops, nl8048_suspend, nl8048_resume);
175
176static int nl8048_probe(struct spi_device *spi)
177{
178	struct nl8048_panel *lcd;
179	int ret;
180
181	lcd = devm_kzalloc(&spi->dev, sizeof(*lcd), GFP_KERNEL);
182	if (!lcd)
183		return -ENOMEM;
184
185	spi_set_drvdata(spi, lcd);
186	lcd->spi = spi;
187
188	lcd->reset_gpio = devm_gpiod_get(&spi->dev, "reset", GPIOD_OUT_LOW);
189	if (IS_ERR(lcd->reset_gpio)) {
190		dev_err(&spi->dev, "failed to parse reset gpio\n");
191		return PTR_ERR(lcd->reset_gpio);
192	}
193
194	spi->mode = SPI_MODE_0;
195	spi->bits_per_word = 32;
196
197	ret = spi_setup(spi);
198	if (ret < 0) {
199		dev_err(&spi->dev, "failed to setup SPI: %d\n", ret);
200		return ret;
201	}
202
203	ret = nl8048_init(lcd);
204	if (ret < 0)
205		return ret;
206
207	drm_panel_init(&lcd->panel, &lcd->spi->dev, &nl8048_funcs,
208		       DRM_MODE_CONNECTOR_DPI);
209
210	drm_panel_add(&lcd->panel);
211
212	return 0;
213}
214
215static void nl8048_remove(struct spi_device *spi)
216{
217	struct nl8048_panel *lcd = spi_get_drvdata(spi);
218
219	drm_panel_remove(&lcd->panel);
220	drm_panel_disable(&lcd->panel);
221	drm_panel_unprepare(&lcd->panel);
222}
223
224static const struct of_device_id nl8048_of_match[] = {
225	{ .compatible = "nec,nl8048hl11", },
226	{ /* sentinel */ },
227};
228
229MODULE_DEVICE_TABLE(of, nl8048_of_match);
230
231static const struct spi_device_id nl8048_ids[] = {
232	{ "nl8048hl11", 0 },
233	{ /* sentinel */ }
234};
235
236MODULE_DEVICE_TABLE(spi, nl8048_ids);
237
238static struct spi_driver nl8048_driver = {
239	.probe		= nl8048_probe,
240	.remove		= nl8048_remove,
241	.id_table	= nl8048_ids,
242	.driver		= {
243		.name	= "panel-nec-nl8048hl11",
244		.pm	= &nl8048_pm_ops,
245		.of_match_table = nl8048_of_match,
246	},
247};
248
249module_spi_driver(nl8048_driver);
250
251MODULE_AUTHOR("Erik Gilling <konkers@android.com>");
252MODULE_DESCRIPTION("NEC-NL8048HL11 Driver");
253MODULE_LICENSE("GPL");
254