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         .vsync_level    = OMAPDSS_SIG_ACTIVE_LOW,
  49         .hsync_level    = OMAPDSS_SIG_ACTIVE_LOW,
  50         .data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE,
  51         .de_level       = OMAPDSS_SIG_ACTIVE_HIGH,
  52         .sync_pclk_edge = OMAPDSS_DRIVE_SIG_OPPOSITE_EDGES,
  53 };
  54
  55 static int sharp_ls_bl_update_status(struct backlight_device *bl)
  56 {
  57         struct omap_dss_device *dssdev = dev_get_drvdata(&bl->dev);
  58         int level;
  59
  60         if (!dssdev->set_backlight)
  61                 return -EINVAL;
  62
  63         if (bl->props.fb_blank == FB_BLANK_UNBLANK &&
  64                         bl->props.power == FB_BLANK_UNBLANK)
  65                 level = bl->props.brightness;
  66         else
  67                 level = 0;
  68
  69         return dssdev->set_backlight(dssdev, level);
  70 }
  71
  72 static int sharp_ls_bl_get_brightness(struct backlight_device *bl)
  73 {
  74         if (bl->props.fb_blank == FB_BLANK_UNBLANK &&
  75                         bl->props.power == FB_BLANK_UNBLANK)
  76                 return bl->props.brightness;
  77
  78         return 0;
  79 }
  80
  81 static const struct backlight_ops sharp_ls_bl_ops = {
  82         .get_brightness = sharp_ls_bl_get_brightness,
  83         .update_status  = sharp_ls_bl_update_status,
  84 };
  85
  86
  87
  88 static int sharp_ls_panel_probe(struct omap_dss_device *dssdev)
  89 {
  90         struct backlight_properties props;
  91         struct backlight_device *bl;
  92         struct sharp_data *sd;
  93         int r;
  94
  95         dssdev->panel.timings = sharp_ls_timings;
  96
  97         sd = kzalloc(sizeof(*sd), GFP_KERNEL);
  98         if (!sd)
  99                 return -ENOMEM;
 100
 101         dev_set_drvdata(&dssdev->dev, sd);
 102
 103         memset(&props, 0, sizeof(struct backlight_properties));
 104         props.max_brightness = dssdev->max_backlight_level;
 105         props.type = BACKLIGHT_RAW;
 106
 107         bl = backlight_device_register("sharp-ls", &dssdev->dev, dssdev,
 108                         &sharp_ls_bl_ops, &props);
 109         if (IS_ERR(bl)) {
 110                 r = PTR_ERR(bl);
 111                 kfree(sd);
 112                 return r;
 113         }
 114         sd->bl = bl;
 115
 116         bl->props.fb_blank = FB_BLANK_UNBLANK;
 117         bl->props.power = FB_BLANK_UNBLANK;
 118         bl->props.brightness = dssdev->max_backlight_level;
 119         r = sharp_ls_bl_update_status(bl);
 120         if (r < 0)
 121                 dev_err(&dssdev->dev, "failed to set lcd brightness\n");
 122
 123         return 0;
 124 }
 125
 126 static void __exit sharp_ls_panel_remove(struct omap_dss_device *dssdev)
 127 {
 128         struct sharp_data *sd = dev_get_drvdata(&dssdev->dev);
 129         struct backlight_device *bl = sd->bl;
 130
 131         bl->props.power = FB_BLANK_POWERDOWN;
 132         sharp_ls_bl_update_status(bl);
 133         backlight_device_unregister(bl);
 134
 135         kfree(sd);
 136 }
 137
 138 static int sharp_ls_power_on(struct omap_dss_device *dssdev)
 139 {
 140         int r = 0;
 141
 142         if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
 143                 return 0;
 144
 145         r = omapdss_dpi_display_enable(dssdev);
 146         if (r)
 147                 goto err0;
 148
 149         /* wait couple of vsyncs until enabling the LCD */
 150         msleep(50);
 151
 152         if (dssdev->platform_enable) {
 153                 r = dssdev->platform_enable(dssdev);
 154                 if (r)
 155                         goto err1;
 156         }
 157
 158         return 0;
 159 err1:
 160         omapdss_dpi_display_disable(dssdev);
 161 err0:
 162         return r;
 163 }
 164
 165 static void sharp_ls_power_off(struct omap_dss_device *dssdev)
 166 {
 167         if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
 168                 return;
 169
 170         if (dssdev->platform_disable)
 171                 dssdev->platform_disable(dssdev);
 172
 173         /* wait at least 5 vsyncs after disabling the LCD */
 174
 175         msleep(100);
 176
 177         omapdss_dpi_display_disable(dssdev);
 178 }
 179
 180 static int sharp_ls_panel_enable(struct omap_dss_device *dssdev)
 181 {
 182         int r;
 183         r = sharp_ls_power_on(dssdev);
 184         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 185         return r;
 186 }
 187
 188 static void sharp_ls_panel_disable(struct omap_dss_device *dssdev)
 189 {
 190         sharp_ls_power_off(dssdev);
 191         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 192 }
 193
 194 static int sharp_ls_panel_suspend(struct omap_dss_device *dssdev)
 195 {
 196         sharp_ls_power_off(dssdev);
 197         dssdev->state = OMAP_DSS_DISPLAY_SUSPENDED;
 198         return 0;
 199 }
 200
 201 static int sharp_ls_panel_resume(struct omap_dss_device *dssdev)
 202 {
 203         int r;
 204         r = sharp_ls_power_on(dssdev);
 205         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 206         return r;
 207 }
 208
 209 static struct omap_dss_driver sharp_ls_driver = {
 210         .probe          = sharp_ls_panel_probe,
 211         .remove         = __exit_p(sharp_ls_panel_remove),
 212
 213         .enable         = sharp_ls_panel_enable,
 214         .disable        = sharp_ls_panel_disable,
 215         .suspend        = sharp_ls_panel_suspend,
 216         .resume         = sharp_ls_panel_resume,
 217
 218         .driver         = {
 219                 .name   = "sharp_ls_panel",
 220                 .owner  = THIS_MODULE,
 221         },
 222 };
 223
 224 static int __init sharp_ls_panel_drv_init(void)
 225 {
 226         return omap_dss_register_driver(&sharp_ls_driver);
 227 }
 228
 229 static void __exit sharp_ls_panel_drv_exit(void)
 230 {
 231         omap_dss_unregister_driver(&sharp_ls_driver);
 232 }
 233
 234 module_init(sharp_ls_panel_drv_init);
 235 module_exit(sharp_ls_panel_drv_exit);
 236 MODULE_LICENSE("GPL");