1 /*
2 * NEC NL8048HL11 Panel driver
3 *
4 * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
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 videomode vm;
27
28 int res_gpio;
29 int qvga_gpio;
30
31 struct spi_device *spi;
32 };
33
34 #define LCD_XRES 800
35 #define LCD_YRES 480
36 /*
37 * NEC PIX Clock Ratings
38 * MIN:21.8MHz TYP:23.8MHz MAX:25.7MHz
39 */
40 #define LCD_PIXEL_CLOCK 23800000
41
42 static const struct {
43 unsigned char addr;
44 unsigned char dat;
45 } nec_8048_init_seq[] = {
46 { 3, 0x01 }, { 0, 0x00 }, { 1, 0x01 }, { 4, 0x00 }, { 5, 0x14 },
47 { 6, 0x24 }, { 16, 0xD7 }, { 17, 0x00 }, { 18, 0x00 }, { 19, 0x55 },
48 { 20, 0x01 }, { 21, 0x70 }, { 22, 0x1E }, { 23, 0x25 }, { 24, 0x25 },
49 { 25, 0x02 }, { 26, 0x02 }, { 27, 0xA0 }, { 32, 0x2F }, { 33, 0x0F },
50 { 34, 0x0F }, { 35, 0x0F }, { 36, 0x0F }, { 37, 0x0F }, { 38, 0x0F },
51 { 39, 0x00 }, { 40, 0x02 }, { 41, 0x02 }, { 42, 0x02 }, { 43, 0x0F },
52 { 44, 0x0F }, { 45, 0x0F }, { 46, 0x0F }, { 47, 0x0F }, { 48, 0x0F },
53 { 49, 0x0F }, { 50, 0x00 }, { 51, 0x02 }, { 52, 0x02 }, { 53, 0x02 },
54 { 80, 0x0C }, { 83, 0x42 }, { 84, 0x42 }, { 85, 0x41 }, { 86, 0x14 },
55 { 89, 0x88 }, { 90, 0x01 }, { 91, 0x00 }, { 92, 0x02 }, { 93, 0x0C },
56 { 94, 0x1C }, { 95, 0x27 }, { 98, 0x49 }, { 99, 0x27 }, { 102, 0x76 },
57 { 103, 0x27 }, { 112, 0x01 }, { 113, 0x0E }, { 114, 0x02 },
58 { 115, 0x0C }, { 118, 0x0C }, { 121, 0x30 }, { 130, 0x00 },
59 { 131, 0x00 }, { 132, 0xFC }, { 134, 0x00 }, { 136, 0x00 },
60 { 138, 0x00 }, { 139, 0x00 }, { 140, 0x00 }, { 141, 0xFC },
61 { 143, 0x00 }, { 145, 0x00 }, { 147, 0x00 }, { 148, 0x00 },
62 { 149, 0x00 }, { 150, 0xFC }, { 152, 0x00 }, { 154, 0x00 },
63 { 156, 0x00 }, { 157, 0x00 }, { 2, 0x00 },
64 };
65
66 static const struct videomode nec_8048_panel_vm = {
67 .hactive = LCD_XRES,
68 .vactive = LCD_YRES,
69 .pixelclock = LCD_PIXEL_CLOCK,
70 .hfront_porch = 6,
71 .hsync_len = 1,
72 .hback_porch = 4,
73 .vfront_porch = 3,
74 .vsync_len = 1,
75 .vback_porch = 4,
76
77 .flags = DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_LOW |
78 DISPLAY_FLAGS_DE_HIGH | DISPLAY_FLAGS_SYNC_POSEDGE |
79 DISPLAY_FLAGS_PIXDATA_POSEDGE,
80 };
81
82 #define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
83
nec_8048_spi_send(struct spi_device * spi,unsigned char reg_addr,unsigned char reg_data)84 static 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
init_nec_8048_wvga_lcd(struct spi_device * spi)101 static 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
nec_8048_connect(struct omap_dss_device * dssdev)115 static 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;
119 int r;
120
121 if (omapdss_device_is_connected(dssdev))
122 return 0;
123
124 in = omapdss_of_find_source_for_first_ep(dssdev->dev->of_node);
125 if (IS_ERR(in)) {
126 dev_err(dssdev->dev, "failed to find video source\n");
127 return PTR_ERR(in);
128 }
129
130 r = in->ops.dpi->connect(in, dssdev);
131 if (r) {
132 omap_dss_put_device(in);
133 return r;
134 }
135
136 ddata->in = in;
137 return 0;
138 }
139
nec_8048_disconnect(struct omap_dss_device * dssdev)140 static void nec_8048_disconnect(struct omap_dss_device *dssdev)
141 {
142 struct panel_drv_data *ddata = to_panel_data(dssdev);
143 struct omap_dss_device *in = ddata->in;
144
145 if (!omapdss_device_is_connected(dssdev))
146 return;
147
148 in->ops.dpi->disconnect(in, dssdev);
149
150 omap_dss_put_device(in);
151 ddata->in = NULL;
152 }
153
nec_8048_enable(struct omap_dss_device * dssdev)154 static int nec_8048_enable(struct omap_dss_device *dssdev)
155 {
156 struct panel_drv_data *ddata = to_panel_data(dssdev);
157 struct omap_dss_device *in = ddata->in;
158 int r;
159
160 if (!omapdss_device_is_connected(dssdev))
161 return -ENODEV;
162
163 if (omapdss_device_is_enabled(dssdev))
164 return 0;
165
166 in->ops.dpi->set_timings(in, &ddata->vm);
167
168 r = in->ops.dpi->enable(in);
169 if (r)
170 return r;
171
172 if (gpio_is_valid(ddata->res_gpio))
173 gpio_set_value_cansleep(ddata->res_gpio, 1);
174
175 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
176
177 return 0;
178 }
179
nec_8048_disable(struct omap_dss_device * dssdev)180 static void nec_8048_disable(struct omap_dss_device *dssdev)
181 {
182 struct panel_drv_data *ddata = to_panel_data(dssdev);
183 struct omap_dss_device *in = ddata->in;
184
185 if (!omapdss_device_is_enabled(dssdev))
186 return;
187
188 if (gpio_is_valid(ddata->res_gpio))
189 gpio_set_value_cansleep(ddata->res_gpio, 0);
190
191 in->ops.dpi->disable(in);
192
193 dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
194 }
195
nec_8048_set_timings(struct omap_dss_device * dssdev,struct videomode * vm)196 static void nec_8048_set_timings(struct omap_dss_device *dssdev,
197 struct videomode *vm)
198 {
199 struct panel_drv_data *ddata = to_panel_data(dssdev);
200 struct omap_dss_device *in = ddata->in;
201
202 ddata->vm = *vm;
203 dssdev->panel.vm = *vm;
204
205 in->ops.dpi->set_timings(in, vm);
206 }
207
nec_8048_get_timings(struct omap_dss_device * dssdev,struct videomode * vm)208 static void nec_8048_get_timings(struct omap_dss_device *dssdev,
209 struct videomode *vm)
210 {
211 struct panel_drv_data *ddata = to_panel_data(dssdev);
212
213 *vm = ddata->vm;
214 }
215
nec_8048_check_timings(struct omap_dss_device * dssdev,struct videomode * vm)216 static int nec_8048_check_timings(struct omap_dss_device *dssdev,
217 struct videomode *vm)
218 {
219 struct panel_drv_data *ddata = to_panel_data(dssdev);
220 struct omap_dss_device *in = ddata->in;
221
222 return in->ops.dpi->check_timings(in, vm);
223 }
224
225 static struct omap_dss_driver nec_8048_ops = {
226 .connect = nec_8048_connect,
227 .disconnect = nec_8048_disconnect,
228
229 .enable = nec_8048_enable,
230 .disable = nec_8048_disable,
231
232 .set_timings = nec_8048_set_timings,
233 .get_timings = nec_8048_get_timings,
234 .check_timings = nec_8048_check_timings,
235 };
236
nec_8048_probe_of(struct spi_device * spi)237 static int nec_8048_probe_of(struct spi_device *spi)
238 {
239 struct device_node *node = spi->dev.of_node;
240 struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
241 int gpio;
242
243 gpio = of_get_named_gpio(node, "reset-gpios", 0);
244 if (!gpio_is_valid(gpio)) {
245 dev_err(&spi->dev, "failed to parse enable gpio\n");
246 return gpio;
247 }
248 ddata->res_gpio = gpio;
249
250 /* XXX the panel spec doesn't mention any QVGA pin?? */
251 ddata->qvga_gpio = -ENOENT;
252
253 return 0;
254 }
255
nec_8048_probe(struct spi_device * spi)256 static int nec_8048_probe(struct spi_device *spi)
257 {
258 struct panel_drv_data *ddata;
259 struct omap_dss_device *dssdev;
260 int r;
261
262 dev_dbg(&spi->dev, "%s\n", __func__);
263
264 spi->mode = SPI_MODE_0;
265 spi->bits_per_word = 32;
266
267 r = spi_setup(spi);
268 if (r < 0) {
269 dev_err(&spi->dev, "spi_setup failed: %d\n", r);
270 return r;
271 }
272
273 init_nec_8048_wvga_lcd(spi);
274
275 ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL);
276 if (ddata == NULL)
277 return -ENOMEM;
278
279 dev_set_drvdata(&spi->dev, ddata);
280
281 ddata->spi = spi;
282
283 r = nec_8048_probe_of(spi);
284 if (r)
285 return r;
286
287 if (gpio_is_valid(ddata->qvga_gpio)) {
288 r = devm_gpio_request_one(&spi->dev, ddata->qvga_gpio,
289 GPIOF_OUT_INIT_HIGH, "lcd QVGA");
290 if (r)
291 return r;
292 }
293
294 if (gpio_is_valid(ddata->res_gpio)) {
295 r = devm_gpio_request_one(&spi->dev, ddata->res_gpio,
296 GPIOF_OUT_INIT_LOW, "lcd RES");
297 if (r)
298 return r;
299 }
300
301 ddata->vm = nec_8048_panel_vm;
302
303 dssdev = &ddata->dssdev;
304 dssdev->dev = &spi->dev;
305 dssdev->driver = &nec_8048_ops;
306 dssdev->type = OMAP_DISPLAY_TYPE_DPI;
307 dssdev->owner = THIS_MODULE;
308 dssdev->panel.vm = ddata->vm;
309
310 r = omapdss_register_display(dssdev);
311 if (r) {
312 dev_err(&spi->dev, "Failed to register panel\n");
313 return r;
314 }
315
316 return 0;
317 }
318
nec_8048_remove(struct spi_device * spi)319 static int nec_8048_remove(struct spi_device *spi)
320 {
321 struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
322 struct omap_dss_device *dssdev = &ddata->dssdev;
323
324 dev_dbg(&ddata->spi->dev, "%s\n", __func__);
325
326 omapdss_unregister_display(dssdev);
327
328 nec_8048_disable(dssdev);
329 nec_8048_disconnect(dssdev);
330
331 return 0;
332 }
333
334 #ifdef CONFIG_PM_SLEEP
nec_8048_suspend(struct device * dev)335 static int nec_8048_suspend(struct device *dev)
336 {
337 struct spi_device *spi = to_spi_device(dev);
338
339 nec_8048_spi_send(spi, 2, 0x01);
340 mdelay(40);
341
342 return 0;
343 }
344
nec_8048_resume(struct device * dev)345 static int nec_8048_resume(struct device *dev)
346 {
347 struct spi_device *spi = to_spi_device(dev);
348
349 /* reinitialize the panel */
350 spi_setup(spi);
351 nec_8048_spi_send(spi, 2, 0x00);
352 init_nec_8048_wvga_lcd(spi);
353
354 return 0;
355 }
356 static SIMPLE_DEV_PM_OPS(nec_8048_pm_ops, nec_8048_suspend,
357 nec_8048_resume);
358 #define NEC_8048_PM_OPS (&nec_8048_pm_ops)
359 #else
360 #define NEC_8048_PM_OPS NULL
361 #endif
362
363 static const struct of_device_id nec_8048_of_match[] = {
364 { .compatible = "omapdss,nec,nl8048hl11", },
365 {},
366 };
367
368 MODULE_DEVICE_TABLE(of, nec_8048_of_match);
369
370 static struct spi_driver nec_8048_driver = {
371 .driver = {
372 .name = "panel-nec-nl8048hl11",
373 .pm = NEC_8048_PM_OPS,
374 .of_match_table = nec_8048_of_match,
375 .suppress_bind_attrs = true,
376 },
377 .probe = nec_8048_probe,
378 .remove = nec_8048_remove,
379 };
380
381 module_spi_driver(nec_8048_driver);
382
383 MODULE_ALIAS("spi:nec,nl8048hl11");
384 MODULE_AUTHOR("Erik Gilling <konkers@android.com>");
385 MODULE_DESCRIPTION("NEC-NL8048HL11 Driver");
386 MODULE_LICENSE("GPL");
387
