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/module.h>
11#include <linux/delay.h>
12#include <linux/spi/spi.h>
13#include <linux/fb.h>
14#include <linux/gpio.h>
15#include <linux/of_gpio.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	int res_gpio;
28	int qvga_gpio;
29
30	struct spi_device *spi;
31};
32
33#define LCD_XRES		800
34#define LCD_YRES		480
35/*
36 * NEC PIX Clock Ratings
37 * MIN:21.8MHz TYP:23.8MHz MAX:25.7MHz
38 */
39#define LCD_PIXEL_CLOCK		23800000
40
41static const struct {
42	unsigned char addr;
43	unsigned char dat;
44} nec_8048_init_seq[] = {
45	{ 3, 0x01 }, { 0, 0x00 }, { 1, 0x01 }, { 4, 0x00 }, { 5, 0x14 },
46	{ 6, 0x24 }, { 16, 0xD7 }, { 17, 0x00 }, { 18, 0x00 }, { 19, 0x55 },
47	{ 20, 0x01 }, { 21, 0x70 }, { 22, 0x1E }, { 23, 0x25 },	{ 24, 0x25 },
48	{ 25, 0x02 }, { 26, 0x02 }, { 27, 0xA0 }, { 32, 0x2F }, { 33, 0x0F },
49	{ 34, 0x0F }, { 35, 0x0F }, { 36, 0x0F }, { 37, 0x0F },	{ 38, 0x0F },
50	{ 39, 0x00 }, { 40, 0x02 }, { 41, 0x02 }, { 42, 0x02 },	{ 43, 0x0F },
51	{ 44, 0x0F }, { 45, 0x0F }, { 46, 0x0F }, { 47, 0x0F },	{ 48, 0x0F },
52	{ 49, 0x0F }, { 50, 0x00 }, { 51, 0x02 }, { 52, 0x02 }, { 53, 0x02 },
53	{ 80, 0x0C }, { 83, 0x42 }, { 84, 0x42 }, { 85, 0x41 },	{ 86, 0x14 },
54	{ 89, 0x88 }, { 90, 0x01 }, { 91, 0x00 }, { 92, 0x02 },	{ 93, 0x0C },
55	{ 94, 0x1C }, { 95, 0x27 }, { 98, 0x49 }, { 99, 0x27 }, { 102, 0x76 },
56	{ 103, 0x27 }, { 112, 0x01 }, { 113, 0x0E }, { 114, 0x02 },
57	{ 115, 0x0C }, { 118, 0x0C }, { 121, 0x30 }, { 130, 0x00 },
58	{ 131, 0x00 }, { 132, 0xFC }, { 134, 0x00 }, { 136, 0x00 },
59	{ 138, 0x00 }, { 139, 0x00 }, { 140, 0x00 }, { 141, 0xFC },
60	{ 143, 0x00 }, { 145, 0x00 }, { 147, 0x00 }, { 148, 0x00 },
61	{ 149, 0x00 }, { 150, 0xFC }, { 152, 0x00 }, { 154, 0x00 },
62	{ 156, 0x00 }, { 157, 0x00 }, { 2, 0x00 },
63};
64
65static const struct omap_video_timings nec_8048_panel_timings = {
66	.x_res		= LCD_XRES,
67	.y_res		= LCD_YRES,
68	.pixelclock	= LCD_PIXEL_CLOCK,
69	.hfp		= 6,
70	.hsw		= 1,
71	.hbp		= 4,
72	.vfp		= 3,
73	.vsw		= 1,
74	.vbp		= 4,
75
76	.vsync_level	= OMAPDSS_SIG_ACTIVE_LOW,
77	.hsync_level	= OMAPDSS_SIG_ACTIVE_LOW,
78	.data_pclk_edge	= OMAPDSS_DRIVE_SIG_RISING_EDGE,
79	.de_level	= OMAPDSS_SIG_ACTIVE_HIGH,
80	.sync_pclk_edge	= OMAPDSS_DRIVE_SIG_RISING_EDGE,
81};
82
83#define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
84
85static int nec_8048_spi_send(struct spi_device *spi, unsigned char reg_addr,
86			unsigned char reg_data)
87{
88	int ret = 0;
89	unsigned int cmd = 0, data = 0;
90
91	cmd = 0x0000 | reg_addr; /* register address write */
92	data = 0x0100 | reg_data; /* register data write */
93	data = (cmd << 16) | data;
94
95	ret = spi_write(spi, (unsigned char *)&data, 4);
96	if (ret)
97		pr_err("error in spi_write %x\n", data);
98
99	return ret;
100}
101
102static int init_nec_8048_wvga_lcd(struct spi_device *spi)
103{
104	unsigned int i;
105	/* Initialization Sequence */
106	/* nec_8048_spi_send(spi, REG, VAL) */
107	for (i = 0; i < (ARRAY_SIZE(nec_8048_init_seq) - 1); i++)
108		nec_8048_spi_send(spi, nec_8048_init_seq[i].addr,
109				nec_8048_init_seq[i].dat);
110	udelay(20);
111	nec_8048_spi_send(spi, nec_8048_init_seq[i].addr,
112				nec_8048_init_seq[i].dat);
113	return 0;
114}
115
116static int nec_8048_connect(struct omap_dss_device *dssdev)
117{
118	struct panel_drv_data *ddata = to_panel_data(dssdev);
119	struct omap_dss_device *in = ddata->in;
120	int r;
121
122	if (omapdss_device_is_connected(dssdev))
123		return 0;
124
125	r = in->ops.dpi->connect(in, dssdev);
126	if (r)
127		return r;
128
129	return 0;
130}
131
132static void nec_8048_disconnect(struct omap_dss_device *dssdev)
133{
134	struct panel_drv_data *ddata = to_panel_data(dssdev);
135	struct omap_dss_device *in = ddata->in;
136
137	if (!omapdss_device_is_connected(dssdev))
138		return;
139
140	in->ops.dpi->disconnect(in, dssdev);
141}
142
143static int nec_8048_enable(struct omap_dss_device *dssdev)
144{
145	struct panel_drv_data *ddata = to_panel_data(dssdev);
146	struct omap_dss_device *in = ddata->in;
147	int r;
148
149	if (!omapdss_device_is_connected(dssdev))
150		return -ENODEV;
151
152	if (omapdss_device_is_enabled(dssdev))
153		return 0;
154
155	if (ddata->data_lines)
156		in->ops.dpi->set_data_lines(in, ddata->data_lines);
157	in->ops.dpi->set_timings(in, &ddata->videomode);
158
159	r = in->ops.dpi->enable(in);
160	if (r)
161		return r;
162
163	if (gpio_is_valid(ddata->res_gpio))
164		gpio_set_value_cansleep(ddata->res_gpio, 1);
165
166	dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
167
168	return 0;
169}
170
171static void nec_8048_disable(struct omap_dss_device *dssdev)
172{
173	struct panel_drv_data *ddata = to_panel_data(dssdev);
174	struct omap_dss_device *in = ddata->in;
175
176	if (!omapdss_device_is_enabled(dssdev))
177		return;
178
179	if (gpio_is_valid(ddata->res_gpio))
180		gpio_set_value_cansleep(ddata->res_gpio, 0);
181
182	in->ops.dpi->disable(in);
183
184	dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
185}
186
187static void nec_8048_set_timings(struct omap_dss_device *dssdev,
188		struct omap_video_timings *timings)
189{
190	struct panel_drv_data *ddata = to_panel_data(dssdev);
191	struct omap_dss_device *in = ddata->in;
192
193	ddata->videomode = *timings;
194	dssdev->panel.timings = *timings;
195
196	in->ops.dpi->set_timings(in, timings);
197}
198
199static void nec_8048_get_timings(struct omap_dss_device *dssdev,
200		struct omap_video_timings *timings)
201{
202	struct panel_drv_data *ddata = to_panel_data(dssdev);
203
204	*timings = ddata->videomode;
205}
206
207static int nec_8048_check_timings(struct omap_dss_device *dssdev,
208		struct omap_video_timings *timings)
209{
210	struct panel_drv_data *ddata = to_panel_data(dssdev);
211	struct omap_dss_device *in = ddata->in;
212
213	return in->ops.dpi->check_timings(in, timings);
214}
215
216static struct omap_dss_driver nec_8048_ops = {
217	.connect	= nec_8048_connect,
218	.disconnect	= nec_8048_disconnect,
219
220	.enable		= nec_8048_enable,
221	.disable	= nec_8048_disable,
222
223	.set_timings	= nec_8048_set_timings,
224	.get_timings	= nec_8048_get_timings,
225	.check_timings	= nec_8048_check_timings,
226
227	.get_resolution	= omapdss_default_get_resolution,
228};
229
230
231static int nec_8048_probe_of(struct spi_device *spi)
232{
233	struct device_node *node = spi->dev.of_node;
234	struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
235	struct omap_dss_device *in;
236	int gpio;
237
238	gpio = of_get_named_gpio(node, "reset-gpios", 0);
239	if (!gpio_is_valid(gpio)) {
240		dev_err(&spi->dev, "failed to parse enable gpio\n");
241		return gpio;
242	}
243	ddata->res_gpio = gpio;
244
245	/* XXX the panel spec doesn't mention any QVGA pin?? */
246	ddata->qvga_gpio = -ENOENT;
247
248	in = omapdss_of_find_source_for_first_ep(node);
249	if (IS_ERR(in)) {
250		dev_err(&spi->dev, "failed to find video source\n");
251		return PTR_ERR(in);
252	}
253
254	ddata->in = in;
255
256	return 0;
257}
258
259static int nec_8048_probe(struct spi_device *spi)
260{
261	struct panel_drv_data *ddata;
262	struct omap_dss_device *dssdev;
263	int r;
264
265	dev_dbg(&spi->dev, "%s\n", __func__);
266
267	if (!spi->dev.of_node)
268		return -ENODEV;
269
270	spi->mode = SPI_MODE_0;
271	spi->bits_per_word = 32;
272
273	r = spi_setup(spi);
274	if (r < 0) {
275		dev_err(&spi->dev, "spi_setup failed: %d\n", r);
276		return r;
277	}
278
279	init_nec_8048_wvga_lcd(spi);
280
281	ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL);
282	if (ddata == NULL)
283		return -ENOMEM;
284
285	dev_set_drvdata(&spi->dev, ddata);
286
287	ddata->spi = spi;
288
289	r = nec_8048_probe_of(spi);
290	if (r)
291		return r;
292
293	if (gpio_is_valid(ddata->qvga_gpio)) {
294		r = devm_gpio_request_one(&spi->dev, ddata->qvga_gpio,
295				GPIOF_OUT_INIT_HIGH, "lcd QVGA");
296		if (r)
297			goto err_gpio;
298	}
299
300	if (gpio_is_valid(ddata->res_gpio)) {
301		r = devm_gpio_request_one(&spi->dev, ddata->res_gpio,
302				GPIOF_OUT_INIT_LOW, "lcd RES");
303		if (r)
304			goto err_gpio;
305	}
306
307	ddata->videomode = nec_8048_panel_timings;
308
309	dssdev = &ddata->dssdev;
310	dssdev->dev = &spi->dev;
311	dssdev->driver = &nec_8048_ops;
312	dssdev->type = OMAP_DISPLAY_TYPE_DPI;
313	dssdev->owner = THIS_MODULE;
314	dssdev->panel.timings = ddata->videomode;
315
316	r = omapdss_register_display(dssdev);
317	if (r) {
318		dev_err(&spi->dev, "Failed to register panel\n");
319		goto err_reg;
320	}
321
322	return 0;
323
324err_reg:
325err_gpio:
326	omap_dss_put_device(ddata->in);
327	return r;
328}
329
330static int nec_8048_remove(struct spi_device *spi)
331{
332	struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
333	struct omap_dss_device *dssdev = &ddata->dssdev;
334	struct omap_dss_device *in = ddata->in;
335
336	dev_dbg(&ddata->spi->dev, "%s\n", __func__);
337
338	omapdss_unregister_display(dssdev);
339
340	nec_8048_disable(dssdev);
341	nec_8048_disconnect(dssdev);
342
343	omap_dss_put_device(in);
344
345	return 0;
346}
347
348#ifdef CONFIG_PM_SLEEP
349static int nec_8048_suspend(struct device *dev)
350{
351	struct spi_device *spi = to_spi_device(dev);
352
353	nec_8048_spi_send(spi, 2, 0x01);
354	mdelay(40);
355
356	return 0;
357}
358
359static int nec_8048_resume(struct device *dev)
360{
361	struct spi_device *spi = to_spi_device(dev);
362
363	/* reinitialize the panel */
364	spi_setup(spi);
365	nec_8048_spi_send(spi, 2, 0x00);
366	init_nec_8048_wvga_lcd(spi);
367
368	return 0;
369}
370static SIMPLE_DEV_PM_OPS(nec_8048_pm_ops, nec_8048_suspend,
371		nec_8048_resume);
372#define NEC_8048_PM_OPS (&nec_8048_pm_ops)
373#else
374#define NEC_8048_PM_OPS NULL
375#endif
376
377static const struct of_device_id nec_8048_of_match[] = {
378	{ .compatible = "omapdss,nec,nl8048hl11", },
379	{},
380};
381
382MODULE_DEVICE_TABLE(of, nec_8048_of_match);
383
384static struct spi_driver nec_8048_driver = {
385	.driver = {
386		.name	= "panel-nec-nl8048hl11",
387		.pm	= NEC_8048_PM_OPS,
388		.of_match_table = nec_8048_of_match,
389		.suppress_bind_attrs = true,
390	},
391	.probe	= nec_8048_probe,
392	.remove	= nec_8048_remove,
393};
394
395module_spi_driver(nec_8048_driver);
396
397MODULE_ALIAS("spi:nec,nl8048hl11");
398MODULE_AUTHOR("Erik Gilling <konkers@android.com>");
399MODULE_DESCRIPTION("NEC-NL8048HL11 Driver");
400MODULE_LICENSE("GPL");
401