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/regulator/consumer.h>
  24 #include <linux/err.h>
  25
  26 #include <plat/display.h>
  27
  28 struct sharp_data {
  29         /* XXX This regulator should actually be in SDP board file, not here,
  30          * as it doesn't actually power the LCD, but something else that
  31          * affects the output to LCD (I think. Somebody clarify). It doesn't do
  32          * harm here, as SDP is the only board using this currently */
  33         struct regulator *vdvi_reg;
  34 };
  35
  36 static struct omap_video_timings sharp_ls_timings = {
  37         .x_res = 480,
  38         .y_res = 640,
  39
  40         .pixel_clock    = 19200,
  41
  42         .hsw            = 2,
  43         .hfp            = 1,
  44         .hbp            = 28,
  45
  46         .vsw            = 1,
  47         .vfp            = 1,
  48         .vbp            = 1,
  49 };
  50
  51 static int sharp_ls_panel_probe(struct omap_dss_device *dssdev)
  52 {
  53         struct sharp_data *sd;
  54
  55         dssdev->panel.config = OMAP_DSS_LCD_TFT | OMAP_DSS_LCD_IVS |
  56                 OMAP_DSS_LCD_IHS;
  57         dssdev->panel.acb = 0x28;
  58         dssdev->panel.timings = sharp_ls_timings;
  59
  60         sd = kzalloc(sizeof(*sd), GFP_KERNEL);
  61         if (!sd)
  62                 return -ENOMEM;
  63
  64         dev_set_drvdata(&dssdev->dev, sd);
  65
  66         sd->vdvi_reg = regulator_get(&dssdev->dev, "vdvi");
  67         if (IS_ERR(sd->vdvi_reg)) {
  68                 kfree(sd);
  69                 pr_err("failed to get VDVI regulator\n");
  70                 return PTR_ERR(sd->vdvi_reg);
  71         }
  72
  73         return 0;
  74 }
  75
  76 static void sharp_ls_panel_remove(struct omap_dss_device *dssdev)
  77 {
  78         struct sharp_data *sd = dev_get_drvdata(&dssdev->dev);
  79
  80         regulator_put(sd->vdvi_reg);
  81
  82         kfree(sd);
  83 }
  84
  85 static int sharp_ls_panel_enable(struct omap_dss_device *dssdev)
  86 {
  87         struct sharp_data *sd = dev_get_drvdata(&dssdev->dev);
  88         int r = 0;
  89
  90         /* wait couple of vsyncs until enabling the LCD */
  91         msleep(50);
  92
  93         regulator_enable(sd->vdvi_reg);
  94
  95         if (dssdev->platform_enable)
  96                 r = dssdev->platform_enable(dssdev);
  97
  98         return r;
  99 }
 100
 101 static void sharp_ls_panel_disable(struct omap_dss_device *dssdev)
 102 {
 103         struct sharp_data *sd = dev_get_drvdata(&dssdev->dev);
 104
 105         if (dssdev->platform_disable)
 106                 dssdev->platform_disable(dssdev);
 107
 108         regulator_disable(sd->vdvi_reg);
 109
 110         /* wait at least 5 vsyncs after disabling the LCD */
 111
 112         msleep(100);
 113 }
 114
 115 static int sharp_ls_panel_suspend(struct omap_dss_device *dssdev)
 116 {
 117         sharp_ls_panel_disable(dssdev);
 118         return 0;
 119 }
 120
 121 static int sharp_ls_panel_resume(struct omap_dss_device *dssdev)
 122 {
 123         return sharp_ls_panel_enable(dssdev);
 124 }
 125
 126 static struct omap_dss_driver sharp_ls_driver = {
 127         .probe          = sharp_ls_panel_probe,
 128         .remove         = sharp_ls_panel_remove,
 129
 130         .enable         = sharp_ls_panel_enable,
 131         .disable        = sharp_ls_panel_disable,
 132         .suspend        = sharp_ls_panel_suspend,
 133         .resume         = sharp_ls_panel_resume,
 134
 135         .driver         = {
 136                 .name   = "sharp_ls_panel",
 137                 .owner  = THIS_MODULE,
 138         },
 139 };
 140
 141 static int __init sharp_ls_panel_drv_init(void)
 142 {
 143         return omap_dss_register_driver(&sharp_ls_driver);
 144 }
 145
 146 static void __exit sharp_ls_panel_drv_exit(void)
 147 {
 148         omap_dss_unregister_driver(&sharp_ls_driver);
 149 }
 150
 151 module_init(sharp_ls_panel_drv_init);
 152 module_exit(sharp_ls_panel_drv_exit);
 153 MODULE_LICENSE("GPL");