drivers/video/omap2/displays/panel-nec-nl8048hl11-01b.c

   1 /*
   2  * Support for NEC-nl8048hl11-01b panel driver
   3  *
   4  * Copyright (C) 2010 Texas Instruments Inc.
   5  * Author: Erik Gilling <konkers@android.com>
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 as published by
   8  * the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along with
  16  * this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/delay.h>
  21 #include <linux/spi/spi.h>
  22 #include <linux/backlight.h>
  23 #include <linux/fb.h>
  24
  25 #include <video/omapdss.h>
  26
  27 #define LCD_XRES                800
  28 #define LCD_YRES                480
  29 /*
  30  * NEC PIX Clock Ratings
  31  * MIN:21.8MHz TYP:23.8MHz MAX:25.7MHz
  32  */
  33 #define LCD_PIXEL_CLOCK         23800
  34
  35 struct nec_8048_data {
  36         struct backlight_device *bl;
  37 };
  38
  39 static const struct {
  40         unsigned char addr;
  41         unsigned char dat;
  42 } nec_8048_init_seq[] = {
  43         { 3, 0x01 }, { 0, 0x00 }, { 1, 0x01 }, { 4, 0x00 }, { 5, 0x14 },
  44         { 6, 0x24 }, { 16, 0xD7 }, { 17, 0x00 }, { 18, 0x00 }, { 19, 0x55 },
  45         { 20, 0x01 }, { 21, 0x70 }, { 22, 0x1E }, { 23, 0x25 }, { 24, 0x25 },
  46         { 25, 0x02 }, { 26, 0x02 }, { 27, 0xA0 }, { 32, 0x2F }, { 33, 0x0F },
  47         { 34, 0x0F }, { 35, 0x0F }, { 36, 0x0F }, { 37, 0x0F }, { 38, 0x0F },
  48         { 39, 0x00 }, { 40, 0x02 }, { 41, 0x02 }, { 42, 0x02 }, { 43, 0x0F },
  49         { 44, 0x0F }, { 45, 0x0F }, { 46, 0x0F }, { 47, 0x0F }, { 48, 0x0F },
  50         { 49, 0x0F }, { 50, 0x00 }, { 51, 0x02 }, { 52, 0x02 }, { 53, 0x02 },
  51         { 80, 0x0C }, { 83, 0x42 }, { 84, 0x42 }, { 85, 0x41 }, { 86, 0x14 },
  52         { 89, 0x88 }, { 90, 0x01 }, { 91, 0x00 }, { 92, 0x02 }, { 93, 0x0C },
  53         { 94, 0x1C }, { 95, 0x27 }, { 98, 0x49 }, { 99, 0x27 }, { 102, 0x76 },
  54         { 103, 0x27 }, { 112, 0x01 }, { 113, 0x0E }, { 114, 0x02 },
  55         { 115, 0x0C }, { 118, 0x0C }, { 121, 0x30 }, { 130, 0x00 },
  56         { 131, 0x00 }, { 132, 0xFC }, { 134, 0x00 }, { 136, 0x00 },
  57         { 138, 0x00 }, { 139, 0x00 }, { 140, 0x00 }, { 141, 0xFC },
  58         { 143, 0x00 }, { 145, 0x00 }, { 147, 0x00 }, { 148, 0x00 },
  59         { 149, 0x00 }, { 150, 0xFC }, { 152, 0x00 }, { 154, 0x00 },
  60         { 156, 0x00 }, { 157, 0x00 }, { 2, 0x00 },
  61 };
  62
  63 /*
  64  * NEC NL8048HL11-01B  Manual
  65  * defines HFB, HSW, HBP, VFP, VSW, VBP as shown below
  66  */
  67
  68 static struct omap_video_timings nec_8048_panel_timings = {
  69         /* 800 x 480 @ 60 Hz  Reduced blanking VESA CVT 0.31M3-R */
  70         .x_res          = LCD_XRES,
  71         .y_res          = LCD_YRES,
  72         .pixel_clock    = LCD_PIXEL_CLOCK,
  73         .hfp            = 6,
  74         .hsw            = 1,
  75         .hbp            = 4,
  76         .vfp            = 3,
  77         .vsw            = 1,
  78         .vbp            = 4,
  79 };
  80
  81 static int nec_8048_bl_update_status(struct backlight_device *bl)
  82 {
  83         struct omap_dss_device *dssdev = dev_get_drvdata(&bl->dev);
  84         int level;
  85
  86         if (!dssdev->set_backlight)
  87                 return -EINVAL;
  88
  89         if (bl->props.fb_blank == FB_BLANK_UNBLANK &&
  90                         bl->props.power == FB_BLANK_UNBLANK)
  91                 level = bl->props.brightness;
  92         else
  93                 level = 0;
  94
  95         return dssdev->set_backlight(dssdev, level);
  96 }
  97
  98 static int nec_8048_bl_get_brightness(struct backlight_device *bl)
  99 {
 100         if (bl->props.fb_blank == FB_BLANK_UNBLANK &&
 101                         bl->props.power == FB_BLANK_UNBLANK)
 102                 return bl->props.brightness;
 103
 104         return 0;
 105 }
 106
 107 static const struct backlight_ops nec_8048_bl_ops = {
 108         .get_brightness = nec_8048_bl_get_brightness,
 109         .update_status  = nec_8048_bl_update_status,
 110 };
 111
 112 static int nec_8048_panel_probe(struct omap_dss_device *dssdev)
 113 {
 114         struct backlight_device *bl;
 115         struct nec_8048_data *necd;
 116         struct backlight_properties props;
 117         int r;
 118
 119         dssdev->panel.config = OMAP_DSS_LCD_TFT | OMAP_DSS_LCD_IVS |
 120                                 OMAP_DSS_LCD_IHS | OMAP_DSS_LCD_RF |
 121                                 OMAP_DSS_LCD_ONOFF;
 122         dssdev->panel.timings = nec_8048_panel_timings;
 123
 124         necd = kzalloc(sizeof(*necd), GFP_KERNEL);
 125         if (!necd)
 126                 return -ENOMEM;
 127
 128         dev_set_drvdata(&dssdev->dev, necd);
 129
 130         memset(&props, 0, sizeof(struct backlight_properties));
 131         props.max_brightness = 255;
 132
 133         bl = backlight_device_register("nec-8048", &dssdev->dev, dssdev,
 134                         &nec_8048_bl_ops, &props);
 135         if (IS_ERR(bl)) {
 136                 r = PTR_ERR(bl);
 137                 kfree(necd);
 138                 return r;
 139         }
 140         necd->bl = bl;
 141
 142         bl->props.fb_blank = FB_BLANK_UNBLANK;
 143         bl->props.power = FB_BLANK_UNBLANK;
 144         bl->props.max_brightness = dssdev->max_backlight_level;
 145         bl->props.brightness = dssdev->max_backlight_level;
 146
 147         r = nec_8048_bl_update_status(bl);
 148         if (r < 0)
 149                 dev_err(&dssdev->dev, "failed to set lcd brightness\n");
 150
 151         return 0;
 152 }
 153
 154 static void nec_8048_panel_remove(struct omap_dss_device *dssdev)
 155 {
 156         struct nec_8048_data *necd = dev_get_drvdata(&dssdev->dev);
 157         struct backlight_device *bl = necd->bl;
 158
 159         bl->props.power = FB_BLANK_POWERDOWN;
 160         nec_8048_bl_update_status(bl);
 161         backlight_device_unregister(bl);
 162
 163         kfree(necd);
 164 }
 165
 166 static int nec_8048_panel_enable(struct omap_dss_device *dssdev)
 167 {
 168         int r = 0;
 169         struct nec_8048_data *necd = dev_get_drvdata(&dssdev->dev);
 170         struct backlight_device *bl = necd->bl;
 171
 172         if (dssdev->platform_enable) {
 173                 r = dssdev->platform_enable(dssdev);
 174                 if (r)
 175                         return r;
 176         }
 177
 178         r = nec_8048_bl_update_status(bl);
 179         if (r < 0)
 180                 dev_err(&dssdev->dev, "failed to set lcd brightness\n");
 181
 182         r = omapdss_dpi_display_enable(dssdev);
 183
 184         return r;
 185 }
 186
 187 static void nec_8048_panel_disable(struct omap_dss_device *dssdev)
 188 {
 189         struct nec_8048_data *necd = dev_get_drvdata(&dssdev->dev);
 190         struct backlight_device *bl = necd->bl;
 191
 192         omapdss_dpi_display_disable(dssdev);
 193
 194         bl->props.brightness = 0;
 195         nec_8048_bl_update_status(bl);
 196
 197         if (dssdev->platform_disable)
 198                 dssdev->platform_disable(dssdev);
 199 }
 200
 201 static int nec_8048_panel_suspend(struct omap_dss_device *dssdev)
 202 {
 203         nec_8048_panel_disable(dssdev);
 204         return 0;
 205 }
 206
 207 static int nec_8048_panel_resume(struct omap_dss_device *dssdev)
 208 {
 209         return nec_8048_panel_enable(dssdev);
 210 }
 211
 212 static int nec_8048_recommended_bpp(struct omap_dss_device *dssdev)
 213 {
 214         return 16;
 215 }
 216
 217 static struct omap_dss_driver nec_8048_driver = {
 218         .probe                  = nec_8048_panel_probe,
 219         .remove                 = nec_8048_panel_remove,
 220         .enable                 = nec_8048_panel_enable,
 221         .disable                = nec_8048_panel_disable,
 222         .suspend                = nec_8048_panel_suspend,
 223         .resume                 = nec_8048_panel_resume,
 224         .get_recommended_bpp    = nec_8048_recommended_bpp,
 225
 226         .driver         = {
 227                 .name           = "NEC_8048_panel",
 228                 .owner          = THIS_MODULE,
 229         },
 230 };
 231
 232 static int nec_8048_spi_send(struct spi_device *spi, unsigned char reg_addr,
 233                         unsigned char reg_data)
 234 {
 235         int ret = 0;
 236         unsigned int cmd = 0, data = 0;
 237
 238         cmd = 0x0000 | reg_addr; /* register address write */
 239         data = 0x0100 | reg_data ; /* register data write */
 240         data = (cmd << 16) | data;
 241
 242         ret = spi_write(spi, (unsigned char *)&data, 4);
 243         if (ret)
 244                 pr_err("error in spi_write %x\n", data);
 245
 246         return ret;
 247 }
 248
 249 static int init_nec_8048_wvga_lcd(struct spi_device *spi)
 250 {
 251         unsigned int i;
 252         /* Initialization Sequence */
 253         /* nec_8048_spi_send(spi, REG, VAL) */
 254         for (i = 0; i < (ARRAY_SIZE(nec_8048_init_seq) - 1); i++)
 255                 nec_8048_spi_send(spi, nec_8048_init_seq[i].addr,
 256                                 nec_8048_init_seq[i].dat);
 257         udelay(20);
 258         nec_8048_spi_send(spi, nec_8048_init_seq[i].addr,
 259                                 nec_8048_init_seq[i].dat);
 260         return 0;
 261 }
 262
 263 static int nec_8048_spi_probe(struct spi_device *spi)
 264 {
 265         spi->mode = SPI_MODE_0;
 266         spi->bits_per_word = 32;
 267         spi_setup(spi);
 268
 269         init_nec_8048_wvga_lcd(spi);
 270
 271         return omap_dss_register_driver(&nec_8048_driver);
 272 }
 273
 274 static int nec_8048_spi_remove(struct spi_device *spi)
 275 {
 276         omap_dss_unregister_driver(&nec_8048_driver);
 277
 278         return 0;
 279 }
 280
 281 static int nec_8048_spi_suspend(struct spi_device *spi, pm_message_t mesg)
 282 {
 283         nec_8048_spi_send(spi, 2, 0x01);
 284         mdelay(40);
 285
 286         return 0;
 287 }
 288
 289 static int nec_8048_spi_resume(struct spi_device *spi)
 290 {
 291         /* reinitialize the panel */
 292         spi_setup(spi);
 293         nec_8048_spi_send(spi, 2, 0x00);
 294         init_nec_8048_wvga_lcd(spi);
 295
 296         return 0;
 297 }
 298
 299 static struct spi_driver nec_8048_spi_driver = {
 300         .probe          = nec_8048_spi_probe,
 301         .remove         = __devexit_p(nec_8048_spi_remove),
 302         .suspend        = nec_8048_spi_suspend,
 303         .resume         = nec_8048_spi_resume,
 304         .driver         = {
 305                 .name   = "nec_8048_spi",
 306                 .bus    = &spi_bus_type,
 307                 .owner  = THIS_MODULE,
 308         },
 309 };
 310
 311 static int __init nec_8048_lcd_init(void)
 312 {
 313         return spi_register_driver(&nec_8048_spi_driver);
 314 }
 315
 316 static void __exit nec_8048_lcd_exit(void)
 317 {
 318         return spi_unregister_driver(&nec_8048_spi_driver);
 319 }
 320
 321 module_init(nec_8048_lcd_init);
 322 module_exit(nec_8048_lcd_exit);
 323 MODULE_AUTHOR("Erik Gilling <konkers@android.com>");
 324 MODULE_DESCRIPTION("NEC-nl8048hl11-01b Driver");
 325 MODULE_LICENSE("GPL");