drivers/video/omap2/displays/panel-sharp-ls037v7dw01.c

   1 /*
   2  * LCD panel driver for Sharp LS037V7DW01
   3  *
   4  * Copyright (C) 2008 Nokia Corporation
   5  * Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License version 2 as published by
   9  * the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along with
  17  * this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <linux/module.h>
  21 #include <linux/delay.h>
  22 #include <linux/device.h>
  23 #include <linux/backlight.h>
  24 #include <linux/fb.h>
  25 #include <linux/err.h>
  26 #include <linux/slab.h>
  27
  28 #include <video/omapdss.h>
  29
  30 struct sharp_data {
  31         struct backlight_device *bl;
  32 };
  33
  34 static struct omap_video_timings sharp_ls_timings = {
  35         .x_res = 480,
  36         .y_res = 640,
  37
  38         .pixel_clock    = 19200,
  39
  40         .hsw            = 2,
  41         .hfp            = 1,
  42         .hbp            = 28,
  43
  44         .vsw            = 1,
  45         .vfp            = 1,
  46         .vbp            = 1,
  47 };
  48
  49 static int sharp_ls_bl_update_status(struct backlight_device *bl)
  50 {
  51         struct omap_dss_device *dssdev = dev_get_drvdata(&bl->dev);
  52         int level;
  53
  54         if (!dssdev->set_backlight)
  55                 return -EINVAL;
  56
  57         if (bl->props.fb_blank == FB_BLANK_UNBLANK &&
  58                         bl->props.power == FB_BLANK_UNBLANK)
  59                 level = bl->props.brightness;
  60         else
  61                 level = 0;
  62
  63         return dssdev->set_backlight(dssdev, level);
  64 }
  65
  66 static int sharp_ls_bl_get_brightness(struct backlight_device *bl)
  67 {
  68         if (bl->props.fb_blank == FB_BLANK_UNBLANK &&
  69                         bl->props.power == FB_BLANK_UNBLANK)
  70                 return bl->props.brightness;
  71
  72         return 0;
  73 }
  74
  75 static const struct backlight_ops sharp_ls_bl_ops = {
  76         .get_brightness = sharp_ls_bl_get_brightness,
  77         .update_status  = sharp_ls_bl_update_status,
  78 };
  79
  80
  81
  82 static int sharp_ls_panel_probe(struct omap_dss_device *dssdev)
  83 {
  84         struct backlight_properties props;
  85         struct backlight_device *bl;
  86         struct sharp_data *sd;
  87         int r;
  88
  89         dssdev->panel.config = OMAP_DSS_LCD_TFT | OMAP_DSS_LCD_IVS |
  90                 OMAP_DSS_LCD_IHS;
  91         dssdev->panel.acb = 0x28;
  92         dssdev->panel.timings = sharp_ls_timings;
  93
  94         sd = kzalloc(sizeof(*sd), GFP_KERNEL);
  95         if (!sd)
  96                 return -ENOMEM;
  97
  98         dev_set_drvdata(&dssdev->dev, sd);
  99
 100         memset(&props, 0, sizeof(struct backlight_properties));
 101         props.max_brightness = dssdev->max_backlight_level;
 102         props.type = BACKLIGHT_RAW;
 103
 104         bl = backlight_device_register("sharp-ls", &dssdev->dev, dssdev,
 105                         &sharp_ls_bl_ops, &props);
 106         if (IS_ERR(bl)) {
 107                 r = PTR_ERR(bl);
 108                 kfree(sd);
 109                 return r;
 110         }
 111         sd->bl = bl;
 112
 113         bl->props.fb_blank = FB_BLANK_UNBLANK;
 114         bl->props.power = FB_BLANK_UNBLANK;
 115         bl->props.brightness = dssdev->max_backlight_level;
 116         r = sharp_ls_bl_update_status(bl);
 117         if (r < 0)
 118                 dev_err(&dssdev->dev, "failed to set lcd brightness\n");
 119
 120         return 0;
 121 }
 122
 123 static void __exit sharp_ls_panel_remove(struct omap_dss_device *dssdev)
 124 {
 125         struct sharp_data *sd = dev_get_drvdata(&dssdev->dev);
 126         struct backlight_device *bl = sd->bl;
 127
 128         bl->props.power = FB_BLANK_POWERDOWN;
 129         sharp_ls_bl_update_status(bl);
 130         backlight_device_unregister(bl);
 131
 132         kfree(sd);
 133 }
 134
 135 static int sharp_ls_power_on(struct omap_dss_device *dssdev)
 136 {
 137         int r = 0;
 138
 139         if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
 140                 return 0;
 141
 142         r = omapdss_dpi_display_enable(dssdev);
 143         if (r)
 144                 goto err0;
 145
 146         /* wait couple of vsyncs until enabling the LCD */
 147         msleep(50);
 148
 149         if (dssdev->platform_enable) {
 150                 r = dssdev->platform_enable(dssdev);
 151                 if (r)
 152                         goto err1;
 153         }
 154
 155         return 0;
 156 err1:
 157         omapdss_dpi_display_disable(dssdev);
 158 err0:
 159         return r;
 160 }
 161
 162 static void sharp_ls_power_off(struct omap_dss_device *dssdev)
 163 {
 164         if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
 165                 return;
 166
 167         if (dssdev->platform_disable)
 168                 dssdev->platform_disable(dssdev);
 169
 170         /* wait at least 5 vsyncs after disabling the LCD */
 171
 172         msleep(100);
 173
 174         omapdss_dpi_display_disable(dssdev);
 175 }
 176
 177 static int sharp_ls_panel_enable(struct omap_dss_device *dssdev)
 178 {
 179         int r;
 180         r = sharp_ls_power_on(dssdev);
 181         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 182         return r;
 183 }
 184
 185 static void sharp_ls_panel_disable(struct omap_dss_device *dssdev)
 186 {
 187         sharp_ls_power_off(dssdev);
 188         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 189 }
 190
 191 static int sharp_ls_panel_suspend(struct omap_dss_device *dssdev)
 192 {
 193         sharp_ls_power_off(dssdev);
 194         dssdev->state = OMAP_DSS_DISPLAY_SUSPENDED;
 195         return 0;
 196 }
 197
 198 static int sharp_ls_panel_resume(struct omap_dss_device *dssdev)
 199 {
 200         int r;
 201         r = sharp_ls_power_on(dssdev);
 202         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 203         return r;
 204 }
 205
 206 static struct omap_dss_driver sharp_ls_driver = {
 207         .probe          = sharp_ls_panel_probe,
 208         .remove         = __exit_p(sharp_ls_panel_remove),
 209
 210         .enable         = sharp_ls_panel_enable,
 211         .disable        = sharp_ls_panel_disable,
 212         .suspend        = sharp_ls_panel_suspend,
 213         .resume         = sharp_ls_panel_resume,
 214
 215         .driver         = {
 216                 .name   = "sharp_ls_panel",
 217                 .owner  = THIS_MODULE,
 218         },
 219 };
 220
 221 static int __init sharp_ls_panel_drv_init(void)
 222 {
 223         return omap_dss_register_driver(&sharp_ls_driver);
 224 }
 225
 226 static void __exit sharp_ls_panel_drv_exit(void)
 227 {
 228         omap_dss_unregister_driver(&sharp_ls_driver);
 229 }
 230
 231 module_init(sharp_ls_panel_drv_init);
 232 module_exit(sharp_ls_panel_drv_exit);
 233 MODULE_LICENSE("GPL");