1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * NEC NL8048HL11 Panel driver
4 *
5 * Copyright (C) 2010 Texas Instruments Inc.
6 * Author: Erik Gilling <konkers@android.com>
7 * Converted to new DSS device model: Tomi Valkeinen <tomi.valkeinen@ti.com>
8 */
9
10#include <linux/delay.h>
11#include <linux/err.h>
12#include <linux/fb.h>
13#include <linux/gpio/consumer.h>
14#include <linux/module.h>
15#include <linux/spi/spi.h>
16
17#include <video/omapfb_dss.h>
18
19struct panel_drv_data {
20	struct omap_dss_device	dssdev;
21	struct omap_dss_device *in;
22
23	struct omap_video_timings videomode;
24
25	int data_lines;
26
27	struct gpio_desc *res_gpio;
28
29	struct spi_device *spi;
30};
31
32#define LCD_XRES		800
33#define LCD_YRES		480
34/*
35 * NEC PIX Clock Ratings
36 * MIN:21.8MHz TYP:23.8MHz MAX:25.7MHz
37 */
38#define LCD_PIXEL_CLOCK		23800000
39
40static const struct {
41	unsigned char addr;
42	unsigned char dat;
43} nec_8048_init_seq[] = {
44	{ 3, 0x01 }, { 0, 0x00 }, { 1, 0x01 }, { 4, 0x00 }, { 5, 0x14 },
45	{ 6, 0x24 }, { 16, 0xD7 }, { 17, 0x00 }, { 18, 0x00 }, { 19, 0x55 },
46	{ 20, 0x01 }, { 21, 0x70 }, { 22, 0x1E }, { 23, 0x25 },	{ 24, 0x25 },
47	{ 25, 0x02 }, { 26, 0x02 }, { 27, 0xA0 }, { 32, 0x2F }, { 33, 0x0F },
48	{ 34, 0x0F }, { 35, 0x0F }, { 36, 0x0F }, { 37, 0x0F },	{ 38, 0x0F },
49	{ 39, 0x00 }, { 40, 0x02 }, { 41, 0x02 }, { 42, 0x02 },	{ 43, 0x0F },
50	{ 44, 0x0F }, { 45, 0x0F }, { 46, 0x0F }, { 47, 0x0F },	{ 48, 0x0F },
51	{ 49, 0x0F }, { 50, 0x00 }, { 51, 0x02 }, { 52, 0x02 }, { 53, 0x02 },
52	{ 80, 0x0C }, { 83, 0x42 }, { 84, 0x42 }, { 85, 0x41 },	{ 86, 0x14 },
53	{ 89, 0x88 }, { 90, 0x01 }, { 91, 0x00 }, { 92, 0x02 },	{ 93, 0x0C },
54	{ 94, 0x1C }, { 95, 0x27 }, { 98, 0x49 }, { 99, 0x27 }, { 102, 0x76 },
55	{ 103, 0x27 }, { 112, 0x01 }, { 113, 0x0E }, { 114, 0x02 },
56	{ 115, 0x0C }, { 118, 0x0C }, { 121, 0x30 }, { 130, 0x00 },
57	{ 131, 0x00 }, { 132, 0xFC }, { 134, 0x00 }, { 136, 0x00 },
58	{ 138, 0x00 }, { 139, 0x00 }, { 140, 0x00 }, { 141, 0xFC },
59	{ 143, 0x00 }, { 145, 0x00 }, { 147, 0x00 }, { 148, 0x00 },
60	{ 149, 0x00 }, { 150, 0xFC }, { 152, 0x00 }, { 154, 0x00 },
61	{ 156, 0x00 }, { 157, 0x00 }, { 2, 0x00 },
62};
63
64static const struct omap_video_timings nec_8048_panel_timings = {
65	.x_res		= LCD_XRES,
66	.y_res		= LCD_YRES,
67	.pixelclock	= LCD_PIXEL_CLOCK,
68	.hfp		= 6,
69	.hsw		= 1,
70	.hbp		= 4,
71	.vfp		= 3,
72	.vsw		= 1,
73	.vbp		= 4,
74
75	.vsync_level	= OMAPDSS_SIG_ACTIVE_LOW,
76	.hsync_level	= OMAPDSS_SIG_ACTIVE_LOW,
77	.data_pclk_edge	= OMAPDSS_DRIVE_SIG_RISING_EDGE,
78	.de_level	= OMAPDSS_SIG_ACTIVE_HIGH,
79	.sync_pclk_edge	= OMAPDSS_DRIVE_SIG_RISING_EDGE,
80};
81
82#define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
83
84static int nec_8048_spi_send(struct spi_device *spi, unsigned char reg_addr,
85			unsigned char reg_data)
86{
87	int ret = 0;
88	unsigned int cmd = 0, data = 0;
89
90	cmd = 0x0000 | reg_addr; /* register address write */
91	data = 0x0100 | reg_data; /* register data write */
92	data = (cmd << 16) | data;
93
94	ret = spi_write(spi, (unsigned char *)&data, 4);
95	if (ret)
96		pr_err("error in spi_write %x\n", data);
97
98	return ret;
99}
100
101static int init_nec_8048_wvga_lcd(struct spi_device *spi)
102{
103	unsigned int i;
104	/* Initialization Sequence */
105	/* nec_8048_spi_send(spi, REG, VAL) */
106	for (i = 0; i < (ARRAY_SIZE(nec_8048_init_seq) - 1); i++)
107		nec_8048_spi_send(spi, nec_8048_init_seq[i].addr,
108				nec_8048_init_seq[i].dat);
109	udelay(20);
110	nec_8048_spi_send(spi, nec_8048_init_seq[i].addr,
111				nec_8048_init_seq[i].dat);
112	return 0;
113}
114
115static int nec_8048_connect(struct omap_dss_device *dssdev)
116{
117	struct panel_drv_data *ddata = to_panel_data(dssdev);
118	struct omap_dss_device *in = ddata->in;
119
120	if (omapdss_device_is_connected(dssdev))
121		return 0;
122
123	return in->ops.dpi->connect(in, dssdev);
124}
125
126static void nec_8048_disconnect(struct omap_dss_device *dssdev)
127{
128	struct panel_drv_data *ddata = to_panel_data(dssdev);
129	struct omap_dss_device *in = ddata->in;
130
131	if (!omapdss_device_is_connected(dssdev))
132		return;
133
134	in->ops.dpi->disconnect(in, dssdev);
135}
136
137static int nec_8048_enable(struct omap_dss_device *dssdev)
138{
139	struct panel_drv_data *ddata = to_panel_data(dssdev);
140	struct omap_dss_device *in = ddata->in;
141	int r;
142
143	if (!omapdss_device_is_connected(dssdev))
144		return -ENODEV;
145
146	if (omapdss_device_is_enabled(dssdev))
147		return 0;
148
149	if (ddata->data_lines)
150		in->ops.dpi->set_data_lines(in, ddata->data_lines);
151	in->ops.dpi->set_timings(in, &ddata->videomode);
152
153	r = in->ops.dpi->enable(in);
154	if (r)
155		return r;
156
157	/* Apparently existing DTSes use incorrect polarity (active high) */
158	gpiod_set_value_cansleep(ddata->res_gpio, 1);
159
160	dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
161
162	return 0;
163}
164
165static void nec_8048_disable(struct omap_dss_device *dssdev)
166{
167	struct panel_drv_data *ddata = to_panel_data(dssdev);
168	struct omap_dss_device *in = ddata->in;
169
170	if (!omapdss_device_is_enabled(dssdev))
171		return;
172
173	/* Apparently existing DTSes use incorrect polarity (active high) */
174	gpiod_set_value_cansleep(ddata->res_gpio, 0);
175
176	in->ops.dpi->disable(in);
177
178	dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
179}
180
181static void nec_8048_set_timings(struct omap_dss_device *dssdev,
182		struct omap_video_timings *timings)
183{
184	struct panel_drv_data *ddata = to_panel_data(dssdev);
185	struct omap_dss_device *in = ddata->in;
186
187	ddata->videomode = *timings;
188	dssdev->panel.timings = *timings;
189
190	in->ops.dpi->set_timings(in, timings);
191}
192
193static void nec_8048_get_timings(struct omap_dss_device *dssdev,
194		struct omap_video_timings *timings)
195{
196	struct panel_drv_data *ddata = to_panel_data(dssdev);
197
198	*timings = ddata->videomode;
199}
200
201static int nec_8048_check_timings(struct omap_dss_device *dssdev,
202		struct omap_video_timings *timings)
203{
204	struct panel_drv_data *ddata = to_panel_data(dssdev);
205	struct omap_dss_device *in = ddata->in;
206
207	return in->ops.dpi->check_timings(in, timings);
208}
209
210static struct omap_dss_driver nec_8048_ops = {
211	.connect	= nec_8048_connect,
212	.disconnect	= nec_8048_disconnect,
213
214	.enable		= nec_8048_enable,
215	.disable	= nec_8048_disable,
216
217	.set_timings	= nec_8048_set_timings,
218	.get_timings	= nec_8048_get_timings,
219	.check_timings	= nec_8048_check_timings,
220
221	.get_resolution	= omapdss_default_get_resolution,
222};
223
224static int nec_8048_probe(struct spi_device *spi)
225{
226	struct panel_drv_data *ddata;
227	struct omap_dss_device *dssdev;
228	int r;
229
230	dev_dbg(&spi->dev, "%s\n", __func__);
231
232	if (!spi->dev.of_node)
233		return -ENODEV;
234
235	spi->mode = SPI_MODE_0;
236	spi->bits_per_word = 32;
237
238	r = spi_setup(spi);
239	if (r < 0) {
240		dev_err(&spi->dev, "spi_setup failed: %d\n", r);
241		return r;
242	}
243
244	init_nec_8048_wvga_lcd(spi);
245
246	ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL);
247	if (ddata == NULL)
248		return -ENOMEM;
249
250	dev_set_drvdata(&spi->dev, ddata);
251
252	ddata->spi = spi;
253
254	ddata->in = omapdss_of_find_source_for_first_ep(spi->dev.of_node);
255	r = PTR_ERR_OR_ZERO(ddata->in);
256	if (r) {
257		dev_err(&spi->dev, "failed to find video source: %d\n", r);
258		return r;
259	}
260
261	ddata->res_gpio = devm_gpiod_get(&spi->dev, "reset", GPIOD_OUT_LOW);
262	r = PTR_ERR_OR_ZERO(ddata->res_gpio);
263	if (r) {
264		dev_err(&spi->dev, "failed to request reset gpio: %d\n", r);
265		goto err_gpio;
266	}
267
268	gpiod_set_consumer_name(ddata->res_gpio, "lcd RES");
269
270	ddata->videomode = nec_8048_panel_timings;
271
272	dssdev = &ddata->dssdev;
273	dssdev->dev = &spi->dev;
274	dssdev->driver = &nec_8048_ops;
275	dssdev->type = OMAP_DISPLAY_TYPE_DPI;
276	dssdev->owner = THIS_MODULE;
277	dssdev->panel.timings = ddata->videomode;
278
279	r = omapdss_register_display(dssdev);
280	if (r) {
281		dev_err(&spi->dev, "Failed to register panel\n");
282		goto err_reg;
283	}
284
285	return 0;
286
287err_reg:
288err_gpio:
289	omap_dss_put_device(ddata->in);
290	return r;
291}
292
293static void nec_8048_remove(struct spi_device *spi)
294{
295	struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
296	struct omap_dss_device *dssdev = &ddata->dssdev;
297	struct omap_dss_device *in = ddata->in;
298
299	dev_dbg(&ddata->spi->dev, "%s\n", __func__);
300
301	omapdss_unregister_display(dssdev);
302
303	nec_8048_disable(dssdev);
304	nec_8048_disconnect(dssdev);
305
306	omap_dss_put_device(in);
307}
308
309#ifdef CONFIG_PM_SLEEP
310static int nec_8048_suspend(struct device *dev)
311{
312	struct spi_device *spi = to_spi_device(dev);
313
314	nec_8048_spi_send(spi, 2, 0x01);
315	mdelay(40);
316
317	return 0;
318}
319
320static int nec_8048_resume(struct device *dev)
321{
322	struct spi_device *spi = to_spi_device(dev);
323
324	/* reinitialize the panel */
325	spi_setup(spi);
326	nec_8048_spi_send(spi, 2, 0x00);
327	init_nec_8048_wvga_lcd(spi);
328
329	return 0;
330}
331static SIMPLE_DEV_PM_OPS(nec_8048_pm_ops, nec_8048_suspend,
332		nec_8048_resume);
333#define NEC_8048_PM_OPS (&nec_8048_pm_ops)
334#else
335#define NEC_8048_PM_OPS NULL
336#endif
337
338static const struct of_device_id nec_8048_of_match[] = {
339	{ .compatible = "omapdss,nec,nl8048hl11", },
340	{},
341};
342
343MODULE_DEVICE_TABLE(of, nec_8048_of_match);
344
345static struct spi_driver nec_8048_driver = {
346	.driver = {
347		.name	= "panel-nec-nl8048hl11",
348		.pm	= NEC_8048_PM_OPS,
349		.of_match_table = nec_8048_of_match,
350		.suppress_bind_attrs = true,
351	},
352	.probe	= nec_8048_probe,
353	.remove	= nec_8048_remove,
354};
355
356module_spi_driver(nec_8048_driver);
357
358MODULE_ALIAS("spi:nec,nl8048hl11");
359MODULE_AUTHOR("Erik Gilling <konkers@android.com>");
360MODULE_DESCRIPTION("NEC-NL8048HL11 Driver");
361MODULE_LICENSE("GPL");
362