1 /*
2 * NEC NL8048HL11 Panel driver
3 *
4 * Copyright (C) 2010 Texas Instruments Inc.
5 * Author: Erik Gilling <konkers@android.com>
6 * Converted to new DSS device model: Tomi Valkeinen <tomi.valkeinen@ti.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 */
13
14 #include <linux/module.h>
15 #include <linux/delay.h>
16 #include <linux/spi/spi.h>
17 #include <linux/gpio/consumer.h>
18 #include <linux/of_gpio.h>
19
20 #include "../dss/omapdss.h"
21
22 struct panel_drv_data {
23 struct omap_dss_device dssdev;
24 struct omap_dss_device *in;
25
26 struct omap_video_timings videomode;
27
28 int data_lines;
29
30 int res_gpio;
31 int qvga_gpio;
32
33 struct spi_device *spi;
34 };
35
36 #define LCD_XRES 800
37 #define LCD_YRES 480
38 /*
39 * NEC PIX Clock Ratings
40 * MIN:21.8MHz TYP:23.8MHz MAX:25.7MHz
41 */
42 #define LCD_PIXEL_CLOCK 23800000
43
44 static const struct {
45 unsigned char addr;
46 unsigned char dat;
47 } nec_8048_init_seq[] = {
48 { 3, 0x01 }, { 0, 0x00 }, { 1, 0x01 }, { 4, 0x00 }, { 5, 0x14 },
49 { 6, 0x24 }, { 16, 0xD7 }, { 17, 0x00 }, { 18, 0x00 }, { 19, 0x55 },
50 { 20, 0x01 }, { 21, 0x70 }, { 22, 0x1E }, { 23, 0x25 }, { 24, 0x25 },
51 { 25, 0x02 }, { 26, 0x02 }, { 27, 0xA0 }, { 32, 0x2F }, { 33, 0x0F },
52 { 34, 0x0F }, { 35, 0x0F }, { 36, 0x0F }, { 37, 0x0F }, { 38, 0x0F },
53 { 39, 0x00 }, { 40, 0x02 }, { 41, 0x02 }, { 42, 0x02 }, { 43, 0x0F },
54 { 44, 0x0F }, { 45, 0x0F }, { 46, 0x0F }, { 47, 0x0F }, { 48, 0x0F },
55 { 49, 0x0F }, { 50, 0x00 }, { 51, 0x02 }, { 52, 0x02 }, { 53, 0x02 },
56 { 80, 0x0C }, { 83, 0x42 }, { 84, 0x42 }, { 85, 0x41 }, { 86, 0x14 },
57 { 89, 0x88 }, { 90, 0x01 }, { 91, 0x00 }, { 92, 0x02 }, { 93, 0x0C },
58 { 94, 0x1C }, { 95, 0x27 }, { 98, 0x49 }, { 99, 0x27 }, { 102, 0x76 },
59 { 103, 0x27 }, { 112, 0x01 }, { 113, 0x0E }, { 114, 0x02 },
60 { 115, 0x0C }, { 118, 0x0C }, { 121, 0x30 }, { 130, 0x00 },
61 { 131, 0x00 }, { 132, 0xFC }, { 134, 0x00 }, { 136, 0x00 },
62 { 138, 0x00 }, { 139, 0x00 }, { 140, 0x00 }, { 141, 0xFC },
63 { 143, 0x00 }, { 145, 0x00 }, { 147, 0x00 }, { 148, 0x00 },
64 { 149, 0x00 }, { 150, 0xFC }, { 152, 0x00 }, { 154, 0x00 },
65 { 156, 0x00 }, { 157, 0x00 }, { 2, 0x00 },
66 };
67
68 static const struct omap_video_timings nec_8048_panel_timings = {
69 .x_res = LCD_XRES,
70 .y_res = LCD_YRES,
71 .pixelclock = LCD_PIXEL_CLOCK,
72 .hfp = 6,
73 .hsw = 1,
74 .hbp = 4,
75 .vfp = 3,
76 .vsw = 1,
77 .vbp = 4,
78
79 .vsync_level = OMAPDSS_SIG_ACTIVE_LOW,
80 .hsync_level = OMAPDSS_SIG_ACTIVE_LOW,
81 .data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE,
82 .de_level = OMAPDSS_SIG_ACTIVE_HIGH,
83 .sync_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE,
84 };
85
86 #define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
87
nec_8048_spi_send(struct spi_device * spi,unsigned char reg_addr,unsigned char reg_data)88 static int nec_8048_spi_send(struct spi_device *spi, unsigned char reg_addr,
89 unsigned char reg_data)
90 {
91 int ret = 0;
92 unsigned int cmd = 0, data = 0;
93
94 cmd = 0x0000 | reg_addr; /* register address write */
95 data = 0x0100 | reg_data; /* register data write */
96 data = (cmd << 16) | data;
97
98 ret = spi_write(spi, (unsigned char *)&data, 4);
99 if (ret)
100 pr_err("error in spi_write %x\n", data);
101
102 return ret;
103 }
104
init_nec_8048_wvga_lcd(struct spi_device * spi)105 static int init_nec_8048_wvga_lcd(struct spi_device *spi)
106 {
107 unsigned int i;
108 /* Initialization Sequence */
109 /* nec_8048_spi_send(spi, REG, VAL) */
110 for (i = 0; i < (ARRAY_SIZE(nec_8048_init_seq) - 1); i++)
111 nec_8048_spi_send(spi, nec_8048_init_seq[i].addr,
112 nec_8048_init_seq[i].dat);
113 udelay(20);
114 nec_8048_spi_send(spi, nec_8048_init_seq[i].addr,
115 nec_8048_init_seq[i].dat);
116 return 0;
117 }
118
nec_8048_connect(struct omap_dss_device * dssdev)119 static int nec_8048_connect(struct omap_dss_device *dssdev)
120 {
121 struct panel_drv_data *ddata = to_panel_data(dssdev);
122 struct omap_dss_device *in = ddata->in;
123 int r;
124
125 if (omapdss_device_is_connected(dssdev))
126 return 0;
127
128 r = in->ops.dpi->connect(in, dssdev);
129 if (r)
130 return r;
131
132 return 0;
133 }
134
nec_8048_disconnect(struct omap_dss_device * dssdev)135 static void nec_8048_disconnect(struct omap_dss_device *dssdev)
136 {
137 struct panel_drv_data *ddata = to_panel_data(dssdev);
138 struct omap_dss_device *in = ddata->in;
139
140 if (!omapdss_device_is_connected(dssdev))
141 return;
142
143 in->ops.dpi->disconnect(in, dssdev);
144 }
145
nec_8048_enable(struct omap_dss_device * dssdev)146 static int nec_8048_enable(struct omap_dss_device *dssdev)
147 {
148 struct panel_drv_data *ddata = to_panel_data(dssdev);
149 struct omap_dss_device *in = ddata->in;
150 int r;
151
152 if (!omapdss_device_is_connected(dssdev))
153 return -ENODEV;
154
155 if (omapdss_device_is_enabled(dssdev))
156 return 0;
157
158 if (ddata->data_lines)
159 in->ops.dpi->set_data_lines(in, ddata->data_lines);
160 in->ops.dpi->set_timings(in, &ddata->videomode);
161
162 r = in->ops.dpi->enable(in);
163 if (r)
164 return r;
165
166 if (gpio_is_valid(ddata->res_gpio))
167 gpio_set_value_cansleep(ddata->res_gpio, 1);
168
169 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
170
171 return 0;
172 }
173
nec_8048_disable(struct omap_dss_device * dssdev)174 static void nec_8048_disable(struct omap_dss_device *dssdev)
175 {
176 struct panel_drv_data *ddata = to_panel_data(dssdev);
177 struct omap_dss_device *in = ddata->in;
178
179 if (!omapdss_device_is_enabled(dssdev))
180 return;
181
182 if (gpio_is_valid(ddata->res_gpio))
183 gpio_set_value_cansleep(ddata->res_gpio, 0);
184
185 in->ops.dpi->disable(in);
186
187 dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
188 }
189
nec_8048_set_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)190 static void nec_8048_set_timings(struct omap_dss_device *dssdev,
191 struct omap_video_timings *timings)
192 {
193 struct panel_drv_data *ddata = to_panel_data(dssdev);
194 struct omap_dss_device *in = ddata->in;
195
196 ddata->videomode = *timings;
197 dssdev->panel.timings = *timings;
198
199 in->ops.dpi->set_timings(in, timings);
200 }
201
nec_8048_get_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)202 static void nec_8048_get_timings(struct omap_dss_device *dssdev,
203 struct omap_video_timings *timings)
204 {
205 struct panel_drv_data *ddata = to_panel_data(dssdev);
206
207 *timings = ddata->videomode;
208 }
209
nec_8048_check_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)210 static int nec_8048_check_timings(struct omap_dss_device *dssdev,
211 struct omap_video_timings *timings)
212 {
213 struct panel_drv_data *ddata = to_panel_data(dssdev);
214 struct omap_dss_device *in = ddata->in;
215
216 return in->ops.dpi->check_timings(in, timings);
217 }
218
219 static struct omap_dss_driver nec_8048_ops = {
220 .connect = nec_8048_connect,
221 .disconnect = nec_8048_disconnect,
222
223 .enable = nec_8048_enable,
224 .disable = nec_8048_disable,
225
226 .set_timings = nec_8048_set_timings,
227 .get_timings = nec_8048_get_timings,
228 .check_timings = nec_8048_check_timings,
229
230 .get_resolution = omapdss_default_get_resolution,
231 };
232
nec_8048_probe_of(struct spi_device * spi)233 static int nec_8048_probe_of(struct spi_device *spi)
234 {
235 struct device_node *node = spi->dev.of_node;
236 struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
237 struct omap_dss_device *in;
238 int gpio;
239
240 gpio = of_get_named_gpio(node, "reset-gpios", 0);
241 if (!gpio_is_valid(gpio)) {
242 dev_err(&spi->dev, "failed to parse enable gpio\n");
243 return gpio;
244 }
245 ddata->res_gpio = gpio;
246
247 /* XXX the panel spec doesn't mention any QVGA pin?? */
248 ddata->qvga_gpio = -ENOENT;
249
250 in = omapdss_of_find_source_for_first_ep(node);
251 if (IS_ERR(in)) {
252 dev_err(&spi->dev, "failed to find video source\n");
253 return PTR_ERR(in);
254 }
255
256 ddata->in = in;
257
258 return 0;
259 }
260
nec_8048_probe(struct spi_device * spi)261 static int nec_8048_probe(struct spi_device *spi)
262 {
263 struct panel_drv_data *ddata;
264 struct omap_dss_device *dssdev;
265 int r;
266
267 dev_dbg(&spi->dev, "%s\n", __func__);
268
269 spi->mode = SPI_MODE_0;
270 spi->bits_per_word = 32;
271
272 r = spi_setup(spi);
273 if (r < 0) {
274 dev_err(&spi->dev, "spi_setup failed: %d\n", r);
275 return r;
276 }
277
278 init_nec_8048_wvga_lcd(spi);
279
280 ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL);
281 if (ddata == NULL)
282 return -ENOMEM;
283
284 dev_set_drvdata(&spi->dev, ddata);
285
286 ddata->spi = spi;
287
288 if (!spi->dev.of_node)
289 return -ENODEV;
290
291 r = nec_8048_probe_of(spi);
292 if (r)
293 return r;
294
295 if (gpio_is_valid(ddata->qvga_gpio)) {
296 r = devm_gpio_request_one(&spi->dev, ddata->qvga_gpio,
297 GPIOF_OUT_INIT_HIGH, "lcd QVGA");
298 if (r)
299 goto err_gpio;
300 }
301
302 if (gpio_is_valid(ddata->res_gpio)) {
303 r = devm_gpio_request_one(&spi->dev, ddata->res_gpio,
304 GPIOF_OUT_INIT_LOW, "lcd RES");
305 if (r)
306 goto err_gpio;
307 }
308
309 ddata->videomode = nec_8048_panel_timings;
310
311 dssdev = &ddata->dssdev;
312 dssdev->dev = &spi->dev;
313 dssdev->driver = &nec_8048_ops;
314 dssdev->type = OMAP_DISPLAY_TYPE_DPI;
315 dssdev->owner = THIS_MODULE;
316 dssdev->panel.timings = ddata->videomode;
317
318 r = omapdss_register_display(dssdev);
319 if (r) {
320 dev_err(&spi->dev, "Failed to register panel\n");
321 goto err_reg;
322 }
323
324 return 0;
325
326 err_reg:
327 err_gpio:
328 omap_dss_put_device(ddata->in);
329 return r;
330 }
331
nec_8048_remove(struct spi_device * spi)332 static int nec_8048_remove(struct spi_device *spi)
333 {
334 struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
335 struct omap_dss_device *dssdev = &ddata->dssdev;
336 struct omap_dss_device *in = ddata->in;
337
338 dev_dbg(&ddata->spi->dev, "%s\n", __func__);
339
340 omapdss_unregister_display(dssdev);
341
342 nec_8048_disable(dssdev);
343 nec_8048_disconnect(dssdev);
344
345 omap_dss_put_device(in);
346
347 return 0;
348 }
349
350 #ifdef CONFIG_PM_SLEEP
nec_8048_suspend(struct device * dev)351 static int nec_8048_suspend(struct device *dev)
352 {
353 struct spi_device *spi = to_spi_device(dev);
354
355 nec_8048_spi_send(spi, 2, 0x01);
356 mdelay(40);
357
358 return 0;
359 }
360
nec_8048_resume(struct device * dev)361 static int nec_8048_resume(struct device *dev)
362 {
363 struct spi_device *spi = to_spi_device(dev);
364
365 /* reinitialize the panel */
366 spi_setup(spi);
367 nec_8048_spi_send(spi, 2, 0x00);
368 init_nec_8048_wvga_lcd(spi);
369
370 return 0;
371 }
372 static SIMPLE_DEV_PM_OPS(nec_8048_pm_ops, nec_8048_suspend,
373 nec_8048_resume);
374 #define NEC_8048_PM_OPS (&nec_8048_pm_ops)
375 #else
376 #define NEC_8048_PM_OPS NULL
377 #endif
378
379 static const struct of_device_id nec_8048_of_match[] = {
380 { .compatible = "omapdss,nec,nl8048hl11", },
381 {},
382 };
383
384 MODULE_DEVICE_TABLE(of, nec_8048_of_match);
385
386 static struct spi_driver nec_8048_driver = {
387 .driver = {
388 .name = "panel-nec-nl8048hl11",
389 .pm = NEC_8048_PM_OPS,
390 .of_match_table = nec_8048_of_match,
391 .suppress_bind_attrs = true,
392 },
393 .probe = nec_8048_probe,
394 .remove = nec_8048_remove,
395 };
396
397 module_spi_driver(nec_8048_driver);
398
399 MODULE_ALIAS("spi:nec,nl8048hl11");
400 MODULE_AUTHOR("Erik Gilling <konkers@android.com>");
401 MODULE_DESCRIPTION("NEC-NL8048HL11 Driver");
402 MODULE_LICENSE("GPL");
403