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/fb.h>
  24 #include <linux/err.h>
  25 #include <linux/slab.h>
  26 #include <linux/gpio.h>
  27
  28 #include <video/omapdss.h>
  29 #include <video/omap-panel-data.h>
  30
  31 static struct omap_video_timings sharp_ls_timings = {
  32         .x_res = 480,
  33         .y_res = 640,
  34
  35         .pixel_clock    = 19200,
  36
  37         .hsw            = 2,
  38         .hfp            = 1,
  39         .hbp            = 28,
  40
  41         .vsw            = 1,
  42         .vfp            = 1,
  43         .vbp            = 1,
  44
  45         .vsync_level    = OMAPDSS_SIG_ACTIVE_LOW,
  46         .hsync_level    = OMAPDSS_SIG_ACTIVE_LOW,
  47         .data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE,
  48         .de_level       = OMAPDSS_SIG_ACTIVE_HIGH,
  49         .sync_pclk_edge = OMAPDSS_DRIVE_SIG_OPPOSITE_EDGES,
  50 };
  51
  52 static inline struct panel_sharp_ls037v7dw01_data
  53 *get_panel_data(const struct omap_dss_device *dssdev)
  54 {
  55         return (struct panel_sharp_ls037v7dw01_data *) dssdev->data;
  56 }
  57
  58 static int sharp_ls_panel_probe(struct omap_dss_device *dssdev)
  59 {
  60         struct panel_sharp_ls037v7dw01_data *pd = get_panel_data(dssdev);
  61         int r;
  62
  63         if (!pd)
  64                 return -EINVAL;
  65
  66         dssdev->panel.timings = sharp_ls_timings;
  67
  68         if (gpio_is_valid(pd->mo_gpio)) {
  69                 r = devm_gpio_request_one(dssdev->dev, pd->mo_gpio,
  70                                 GPIOF_OUT_INIT_LOW, "lcd MO");
  71                 if (r)
  72                         return r;
  73         }
  74
  75         if (gpio_is_valid(pd->lr_gpio)) {
  76                 r = devm_gpio_request_one(dssdev->dev, pd->lr_gpio,
  77                                 GPIOF_OUT_INIT_HIGH, "lcd LR");
  78                 if (r)
  79                         return r;
  80         }
  81
  82         if (gpio_is_valid(pd->ud_gpio)) {
  83                 r = devm_gpio_request_one(dssdev->dev, pd->ud_gpio,
  84                                 GPIOF_OUT_INIT_HIGH, "lcd UD");
  85                 if (r)
  86                         return r;
  87         }
  88
  89         if (gpio_is_valid(pd->resb_gpio)) {
  90                 r = devm_gpio_request_one(dssdev->dev, pd->resb_gpio,
  91                                 GPIOF_OUT_INIT_LOW, "lcd RESB");
  92                 if (r)
  93                         return r;
  94         }
  95
  96         if (gpio_is_valid(pd->ini_gpio)) {
  97                 r = devm_gpio_request_one(dssdev->dev, pd->ini_gpio,
  98                                 GPIOF_OUT_INIT_LOW, "lcd INI");
  99                 if (r)
 100                         return r;
 101         }
 102
 103         return 0;
 104 }
 105
 106 static void __exit sharp_ls_panel_remove(struct omap_dss_device *dssdev)
 107 {
 108 }
 109
 110 static int sharp_ls_power_on(struct omap_dss_device *dssdev)
 111 {
 112         struct panel_sharp_ls037v7dw01_data *pd = get_panel_data(dssdev);
 113         int r = 0;
 114
 115         if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
 116                 return 0;
 117
 118         omapdss_dpi_set_timings(dssdev, &dssdev->panel.timings);
 119         omapdss_dpi_set_data_lines(dssdev, dssdev->phy.dpi.data_lines);
 120
 121         r = omapdss_dpi_display_enable(dssdev);
 122         if (r)
 123                 goto err0;
 124
 125         /* wait couple of vsyncs until enabling the LCD */
 126         msleep(50);
 127
 128         if (gpio_is_valid(pd->resb_gpio))
 129                 gpio_set_value_cansleep(pd->resb_gpio, 1);
 130
 131         if (gpio_is_valid(pd->ini_gpio))
 132                 gpio_set_value_cansleep(pd->ini_gpio, 1);
 133
 134         return 0;
 135 err0:
 136         return r;
 137 }
 138
 139 static void sharp_ls_power_off(struct omap_dss_device *dssdev)
 140 {
 141         struct panel_sharp_ls037v7dw01_data *pd = get_panel_data(dssdev);
 142
 143         if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
 144                 return;
 145
 146         if (gpio_is_valid(pd->ini_gpio))
 147                 gpio_set_value_cansleep(pd->ini_gpio, 0);
 148
 149         if (gpio_is_valid(pd->resb_gpio))
 150                 gpio_set_value_cansleep(pd->resb_gpio, 0);
 151
 152         /* wait at least 5 vsyncs after disabling the LCD */
 153
 154         msleep(100);
 155
 156         omapdss_dpi_display_disable(dssdev);
 157 }
 158
 159 static int sharp_ls_panel_enable(struct omap_dss_device *dssdev)
 160 {
 161         int r;
 162         r = sharp_ls_power_on(dssdev);
 163         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 164         return r;
 165 }
 166
 167 static void sharp_ls_panel_disable(struct omap_dss_device *dssdev)
 168 {
 169         sharp_ls_power_off(dssdev);
 170         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 171 }
 172
 173 static struct omap_dss_driver sharp_ls_driver = {
 174         .probe          = sharp_ls_panel_probe,
 175         .remove         = __exit_p(sharp_ls_panel_remove),
 176
 177         .enable         = sharp_ls_panel_enable,
 178         .disable        = sharp_ls_panel_disable,
 179
 180         .driver         = {
 181                 .name   = "sharp_ls_panel",
 182                 .owner  = THIS_MODULE,
 183         },
 184 };
 185
 186 static int __init sharp_ls_panel_drv_init(void)
 187 {
 188         return omap_dss_register_driver(&sharp_ls_driver);
 189 }
 190
 191 static void __exit sharp_ls_panel_drv_exit(void)
 192 {
 193         omap_dss_unregister_driver(&sharp_ls_driver);
 194 }
 195
 196 module_init(sharp_ls_panel_drv_init);
 197 module_exit(sharp_ls_panel_drv_exit);
 198 MODULE_LICENSE("GPL");