drivers/video/fbdev/omap/lcd_ams_delta.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Based on drivers/video/omap/lcd_inn1510.c
   4  *
   5  * LCD panel support for the Amstrad E3 (Delta) videophone.
   6  *
   7  * Copyright (C) 2006 Jonathan McDowell <noodles@earth.li>
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/io.h>
  13 #include <linux/delay.h>
  14 #include <linux/gpio/consumer.h>
  15 #include <linux/lcd.h>
  16
  17 #include <linux/soc/ti/omap1-io.h>
  18
  19 #include "omapfb.h"
  20
  21 #define AMS_DELTA_DEFAULT_CONTRAST      112
  22
  23 #define AMS_DELTA_MAX_CONTRAST          0x00FF
  24 #define AMS_DELTA_LCD_POWER             0x0100
  25
  26
  27 /* LCD class device section */
  28
  29 static int ams_delta_lcd;
  30 static struct gpio_desc *gpiod_vblen;
  31 static struct gpio_desc *gpiod_ndisp;
  32
  33 static int ams_delta_lcd_set_power(struct lcd_device *dev, int power)
  34 {
  35         if (power == LCD_POWER_ON) {
  36                 if (!(ams_delta_lcd & AMS_DELTA_LCD_POWER)) {
  37                         omap_writeb(ams_delta_lcd & AMS_DELTA_MAX_CONTRAST,
  38                                         OMAP_PWL_ENABLE);
  39                         omap_writeb(1, OMAP_PWL_CLK_ENABLE);
  40                         ams_delta_lcd |= AMS_DELTA_LCD_POWER;
  41                 }
  42         } else {
  43                 if (ams_delta_lcd & AMS_DELTA_LCD_POWER) {
  44                         omap_writeb(0, OMAP_PWL_ENABLE);
  45                         omap_writeb(0, OMAP_PWL_CLK_ENABLE);
  46                         ams_delta_lcd &= ~AMS_DELTA_LCD_POWER;
  47                 }
  48         }
  49         return 0;
  50 }
  51
  52 static int ams_delta_lcd_set_contrast(struct lcd_device *dev, int value)
  53 {
  54         if ((value >= 0) && (value <= AMS_DELTA_MAX_CONTRAST)) {
  55                 omap_writeb(value, OMAP_PWL_ENABLE);
  56                 ams_delta_lcd &= ~AMS_DELTA_MAX_CONTRAST;
  57                 ams_delta_lcd |= value;
  58         }
  59         return 0;
  60 }
  61
  62 #ifdef CONFIG_LCD_CLASS_DEVICE
  63 static int ams_delta_lcd_get_power(struct lcd_device *dev)
  64 {
  65         if (ams_delta_lcd & AMS_DELTA_LCD_POWER)
  66                 return LCD_POWER_ON;
  67         else
  68                 return LCD_POWER_OFF;
  69 }
  70
  71 static int ams_delta_lcd_get_contrast(struct lcd_device *dev)
  72 {
  73         if (!(ams_delta_lcd & AMS_DELTA_LCD_POWER))
  74                 return 0;
  75
  76         return ams_delta_lcd & AMS_DELTA_MAX_CONTRAST;
  77 }
  78
  79 static const struct lcd_ops ams_delta_lcd_ops = {
  80         .get_power = ams_delta_lcd_get_power,
  81         .set_power = ams_delta_lcd_set_power,
  82         .get_contrast = ams_delta_lcd_get_contrast,
  83         .set_contrast = ams_delta_lcd_set_contrast,
  84 };
  85 #endif
  86
  87
  88 /* omapfb panel section */
  89
  90 static int ams_delta_panel_enable(struct lcd_panel *panel)
  91 {
  92         gpiod_set_value(gpiod_ndisp, 1);
  93         gpiod_set_value(gpiod_vblen, 1);
  94         return 0;
  95 }
  96
  97 static void ams_delta_panel_disable(struct lcd_panel *panel)
  98 {
  99         gpiod_set_value(gpiod_vblen, 0);
 100         gpiod_set_value(gpiod_ndisp, 0);
 101 }
 102
 103 static struct lcd_panel ams_delta_panel = {
 104         .name           = "ams-delta",
 105         .config         = 0,
 106
 107         .bpp            = 12,
 108         .data_lines     = 16,
 109         .x_res          = 480,
 110         .y_res          = 320,
 111         .pixel_clock    = 4687,
 112         .hsw            = 3,
 113         .hfp            = 1,
 114         .hbp            = 1,
 115         .vsw            = 1,
 116         .vfp            = 0,
 117         .vbp            = 0,
 118         .pcd            = 0,
 119         .acb            = 37,
 120
 121         .enable         = ams_delta_panel_enable,
 122         .disable        = ams_delta_panel_disable,
 123 };
 124
 125
 126 /* platform driver section */
 127
 128 static int ams_delta_panel_probe(struct platform_device *pdev)
 129 {
 130         struct lcd_device *lcd_device = NULL;
 131
 132         gpiod_vblen = devm_gpiod_get(&pdev->dev, "vblen", GPIOD_OUT_LOW);
 133         if (IS_ERR(gpiod_vblen))
 134                 return dev_err_probe(&pdev->dev, PTR_ERR(gpiod_vblen),
 135                                      "VBLEN GPIO request failed\n");
 136
 137         gpiod_ndisp = devm_gpiod_get(&pdev->dev, "ndisp", GPIOD_OUT_LOW);
 138         if (IS_ERR(gpiod_ndisp))
 139                 return dev_err_probe(&pdev->dev, PTR_ERR(gpiod_ndisp),
 140                                      "NDISP GPIO request failed\n");
 141
 142 #ifdef CONFIG_LCD_CLASS_DEVICE
 143         lcd_device = lcd_device_register("omapfb", &pdev->dev, NULL,
 144                                                 &ams_delta_lcd_ops);
 145
 146         if (IS_ERR(lcd_device)) {
 147                 int ret = PTR_ERR(lcd_device);
 148
 149                 dev_err(&pdev->dev, "failed to register device\n");
 150                 return ret;
 151         }
 152
 153         platform_set_drvdata(pdev, lcd_device);
 154         lcd_device->props.max_contrast = AMS_DELTA_MAX_CONTRAST;
 155 #endif
 156
 157         ams_delta_lcd_set_contrast(lcd_device, AMS_DELTA_DEFAULT_CONTRAST);
 158         ams_delta_lcd_set_power(lcd_device, LCD_POWER_ON);
 159
 160         omapfb_register_panel(&ams_delta_panel);
 161         return 0;
 162 }
 163
 164 static struct platform_driver ams_delta_panel_driver = {
 165         .probe          = ams_delta_panel_probe,
 166         .driver         = {
 167                 .name   = "lcd_ams_delta",
 168         },
 169 };
 170
 171 module_platform_driver(ams_delta_panel_driver);
 172
 173 MODULE_AUTHOR("Jonathan McDowell <noodles@earth.li>");
 174 MODULE_DESCRIPTION("LCD panel support for the Amstrad E3 (Delta) videophone");
 175 MODULE_LICENSE("GPL");