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
19 struct 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
41 static 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
65 static 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
nec_8048_spi_send(struct spi_device * spi,unsigned char reg_addr,unsigned char reg_data)85 static 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
init_nec_8048_wvga_lcd(struct spi_device * spi)102 static 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
nec_8048_connect(struct omap_dss_device * dssdev)116 static 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
121 if (omapdss_device_is_connected(dssdev))
122 return 0;
123
124 return in->ops.dpi->connect(in, dssdev);
125 }
126
nec_8048_disconnect(struct omap_dss_device * dssdev)127 static void nec_8048_disconnect(struct omap_dss_device *dssdev)
128 {
129 struct panel_drv_data *ddata = to_panel_data(dssdev);
130 struct omap_dss_device *in = ddata->in;
131
132 if (!omapdss_device_is_connected(dssdev))
133 return;
134
135 in->ops.dpi->disconnect(in, dssdev);
136 }
137
nec_8048_enable(struct omap_dss_device * dssdev)138 static int nec_8048_enable(struct omap_dss_device *dssdev)
139 {
140 struct panel_drv_data *ddata = to_panel_data(dssdev);
141 struct omap_dss_device *in = ddata->in;
142 int r;
143
144 if (!omapdss_device_is_connected(dssdev))
145 return -ENODEV;
146
147 if (omapdss_device_is_enabled(dssdev))
148 return 0;
149
150 if (ddata->data_lines)
151 in->ops.dpi->set_data_lines(in, ddata->data_lines);
152 in->ops.dpi->set_timings(in, &ddata->videomode);
153
154 r = in->ops.dpi->enable(in);
155 if (r)
156 return r;
157
158 if (gpio_is_valid(ddata->res_gpio))
159 gpio_set_value_cansleep(ddata->res_gpio, 1);
160
161 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
162
163 return 0;
164 }
165
nec_8048_disable(struct omap_dss_device * dssdev)166 static void nec_8048_disable(struct omap_dss_device *dssdev)
167 {
168 struct panel_drv_data *ddata = to_panel_data(dssdev);
169 struct omap_dss_device *in = ddata->in;
170
171 if (!omapdss_device_is_enabled(dssdev))
172 return;
173
174 if (gpio_is_valid(ddata->res_gpio))
175 gpio_set_value_cansleep(ddata->res_gpio, 0);
176
177 in->ops.dpi->disable(in);
178
179 dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
180 }
181
nec_8048_set_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)182 static void nec_8048_set_timings(struct omap_dss_device *dssdev,
183 struct omap_video_timings *timings)
184 {
185 struct panel_drv_data *ddata = to_panel_data(dssdev);
186 struct omap_dss_device *in = ddata->in;
187
188 ddata->videomode = *timings;
189 dssdev->panel.timings = *timings;
190
191 in->ops.dpi->set_timings(in, timings);
192 }
193
nec_8048_get_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)194 static void nec_8048_get_timings(struct omap_dss_device *dssdev,
195 struct omap_video_timings *timings)
196 {
197 struct panel_drv_data *ddata = to_panel_data(dssdev);
198
199 *timings = ddata->videomode;
200 }
201
nec_8048_check_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)202 static int nec_8048_check_timings(struct omap_dss_device *dssdev,
203 struct omap_video_timings *timings)
204 {
205 struct panel_drv_data *ddata = to_panel_data(dssdev);
206 struct omap_dss_device *in = ddata->in;
207
208 return in->ops.dpi->check_timings(in, timings);
209 }
210
211 static struct omap_dss_driver nec_8048_ops = {
212 .connect = nec_8048_connect,
213 .disconnect = nec_8048_disconnect,
214
215 .enable = nec_8048_enable,
216 .disable = nec_8048_disable,
217
218 .set_timings = nec_8048_set_timings,
219 .get_timings = nec_8048_get_timings,
220 .check_timings = nec_8048_check_timings,
221
222 .get_resolution = omapdss_default_get_resolution,
223 };
224
225
nec_8048_probe_of(struct spi_device * spi)226 static int nec_8048_probe_of(struct spi_device *spi)
227 {
228 struct device_node *node = spi->dev.of_node;
229 struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
230 struct omap_dss_device *in;
231 int gpio;
232
233 gpio = of_get_named_gpio(node, "reset-gpios", 0);
234 if (!gpio_is_valid(gpio)) {
235 dev_err(&spi->dev, "failed to parse enable gpio\n");
236 return gpio;
237 }
238 ddata->res_gpio = gpio;
239
240 /* XXX the panel spec doesn't mention any QVGA pin?? */
241 ddata->qvga_gpio = -ENOENT;
242
243 in = omapdss_of_find_source_for_first_ep(node);
244 if (IS_ERR(in)) {
245 dev_err(&spi->dev, "failed to find video source\n");
246 return PTR_ERR(in);
247 }
248
249 ddata->in = in;
250
251 return 0;
252 }
253
nec_8048_probe(struct spi_device * spi)254 static int nec_8048_probe(struct spi_device *spi)
255 {
256 struct panel_drv_data *ddata;
257 struct omap_dss_device *dssdev;
258 int r;
259
260 dev_dbg(&spi->dev, "%s\n", __func__);
261
262 if (!spi->dev.of_node)
263 return -ENODEV;
264
265 spi->mode = SPI_MODE_0;
266 spi->bits_per_word = 32;
267
268 r = spi_setup(spi);
269 if (r < 0) {
270 dev_err(&spi->dev, "spi_setup failed: %d\n", r);
271 return r;
272 }
273
274 init_nec_8048_wvga_lcd(spi);
275
276 ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL);
277 if (ddata == NULL)
278 return -ENOMEM;
279
280 dev_set_drvdata(&spi->dev, ddata);
281
282 ddata->spi = spi;
283
284 r = nec_8048_probe_of(spi);
285 if (r)
286 return r;
287
288 if (gpio_is_valid(ddata->qvga_gpio)) {
289 r = devm_gpio_request_one(&spi->dev, ddata->qvga_gpio,
290 GPIOF_OUT_INIT_HIGH, "lcd QVGA");
291 if (r)
292 goto err_gpio;
293 }
294
295 if (gpio_is_valid(ddata->res_gpio)) {
296 r = devm_gpio_request_one(&spi->dev, ddata->res_gpio,
297 GPIOF_OUT_INIT_LOW, "lcd RES");
298 if (r)
299 goto err_gpio;
300 }
301
302 ddata->videomode = nec_8048_panel_timings;
303
304 dssdev = &ddata->dssdev;
305 dssdev->dev = &spi->dev;
306 dssdev->driver = &nec_8048_ops;
307 dssdev->type = OMAP_DISPLAY_TYPE_DPI;
308 dssdev->owner = THIS_MODULE;
309 dssdev->panel.timings = ddata->videomode;
310
311 r = omapdss_register_display(dssdev);
312 if (r) {
313 dev_err(&spi->dev, "Failed to register panel\n");
314 goto err_reg;
315 }
316
317 return 0;
318
319 err_reg:
320 err_gpio:
321 omap_dss_put_device(ddata->in);
322 return r;
323 }
324
nec_8048_remove(struct spi_device * spi)325 static void nec_8048_remove(struct spi_device *spi)
326 {
327 struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
328 struct omap_dss_device *dssdev = &ddata->dssdev;
329 struct omap_dss_device *in = ddata->in;
330
331 dev_dbg(&ddata->spi->dev, "%s\n", __func__);
332
333 omapdss_unregister_display(dssdev);
334
335 nec_8048_disable(dssdev);
336 nec_8048_disconnect(dssdev);
337
338 omap_dss_put_device(in);
339 }
340
341 #ifdef CONFIG_PM_SLEEP
nec_8048_suspend(struct device * dev)342 static int nec_8048_suspend(struct device *dev)
343 {
344 struct spi_device *spi = to_spi_device(dev);
345
346 nec_8048_spi_send(spi, 2, 0x01);
347 mdelay(40);
348
349 return 0;
350 }
351
nec_8048_resume(struct device * dev)352 static int nec_8048_resume(struct device *dev)
353 {
354 struct spi_device *spi = to_spi_device(dev);
355
356 /* reinitialize the panel */
357 spi_setup(spi);
358 nec_8048_spi_send(spi, 2, 0x00);
359 init_nec_8048_wvga_lcd(spi);
360
361 return 0;
362 }
363 static SIMPLE_DEV_PM_OPS(nec_8048_pm_ops, nec_8048_suspend,
364 nec_8048_resume);
365 #define NEC_8048_PM_OPS (&nec_8048_pm_ops)
366 #else
367 #define NEC_8048_PM_OPS NULL
368 #endif
369
370 static const struct of_device_id nec_8048_of_match[] = {
371 { .compatible = "omapdss,nec,nl8048hl11", },
372 {},
373 };
374
375 MODULE_DEVICE_TABLE(of, nec_8048_of_match);
376
377 static struct spi_driver nec_8048_driver = {
378 .driver = {
379 .name = "panel-nec-nl8048hl11",
380 .pm = NEC_8048_PM_OPS,
381 .of_match_table = nec_8048_of_match,
382 .suppress_bind_attrs = true,
383 },
384 .probe = nec_8048_probe,
385 .remove = nec_8048_remove,
386 };
387
388 module_spi_driver(nec_8048_driver);
389
390 MODULE_ALIAS("spi:nec,nl8048hl11");
391 MODULE_AUTHOR("Erik Gilling <konkers@android.com>");
392 MODULE_DESCRIPTION("NEC-NL8048HL11 Driver");
393 MODULE_LICENSE("GPL");
394