176 lines
4.0 KiB
C
176 lines
4.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Based on drivers/video/omap/lcd_inn1510.c
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*
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* LCD panel support for the Amstrad E3 (Delta) videophone.
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*
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* Copyright (C) 2006 Jonathan McDowell <noodles@earth.li>
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*/
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/io.h>
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#include <linux/delay.h>
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#include <linux/gpio/consumer.h>
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#include <linux/lcd.h>
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#include <mach/hardware.h>
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#include "omapfb.h"
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#define AMS_DELTA_DEFAULT_CONTRAST 112
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#define AMS_DELTA_MAX_CONTRAST 0x00FF
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#define AMS_DELTA_LCD_POWER 0x0100
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/* LCD class device section */
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static int ams_delta_lcd;
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static struct gpio_desc *gpiod_vblen;
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static struct gpio_desc *gpiod_ndisp;
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static int ams_delta_lcd_set_power(struct lcd_device *dev, int power)
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{
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if (power == FB_BLANK_UNBLANK) {
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if (!(ams_delta_lcd & AMS_DELTA_LCD_POWER)) {
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omap_writeb(ams_delta_lcd & AMS_DELTA_MAX_CONTRAST,
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OMAP_PWL_ENABLE);
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omap_writeb(1, OMAP_PWL_CLK_ENABLE);
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ams_delta_lcd |= AMS_DELTA_LCD_POWER;
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}
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} else {
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if (ams_delta_lcd & AMS_DELTA_LCD_POWER) {
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omap_writeb(0, OMAP_PWL_ENABLE);
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omap_writeb(0, OMAP_PWL_CLK_ENABLE);
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ams_delta_lcd &= ~AMS_DELTA_LCD_POWER;
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}
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}
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return 0;
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}
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static int ams_delta_lcd_set_contrast(struct lcd_device *dev, int value)
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{
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if ((value >= 0) && (value <= AMS_DELTA_MAX_CONTRAST)) {
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omap_writeb(value, OMAP_PWL_ENABLE);
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ams_delta_lcd &= ~AMS_DELTA_MAX_CONTRAST;
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ams_delta_lcd |= value;
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}
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return 0;
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}
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#ifdef CONFIG_LCD_CLASS_DEVICE
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static int ams_delta_lcd_get_power(struct lcd_device *dev)
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{
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if (ams_delta_lcd & AMS_DELTA_LCD_POWER)
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return FB_BLANK_UNBLANK;
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else
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return FB_BLANK_POWERDOWN;
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}
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static int ams_delta_lcd_get_contrast(struct lcd_device *dev)
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{
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if (!(ams_delta_lcd & AMS_DELTA_LCD_POWER))
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return 0;
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return ams_delta_lcd & AMS_DELTA_MAX_CONTRAST;
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}
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static struct lcd_ops ams_delta_lcd_ops = {
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.get_power = ams_delta_lcd_get_power,
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.set_power = ams_delta_lcd_set_power,
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.get_contrast = ams_delta_lcd_get_contrast,
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.set_contrast = ams_delta_lcd_set_contrast,
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};
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#endif
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/* omapfb panel section */
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static int ams_delta_panel_enable(struct lcd_panel *panel)
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{
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gpiod_set_value(gpiod_ndisp, 1);
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gpiod_set_value(gpiod_vblen, 1);
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return 0;
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}
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static void ams_delta_panel_disable(struct lcd_panel *panel)
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{
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gpiod_set_value(gpiod_vblen, 0);
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gpiod_set_value(gpiod_ndisp, 0);
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}
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static struct lcd_panel ams_delta_panel = {
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.name = "ams-delta",
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.config = 0,
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.bpp = 12,
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.data_lines = 16,
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.x_res = 480,
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.y_res = 320,
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.pixel_clock = 4687,
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.hsw = 3,
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.hfp = 1,
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.hbp = 1,
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.vsw = 1,
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.vfp = 0,
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.vbp = 0,
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.pcd = 0,
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.acb = 37,
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.enable = ams_delta_panel_enable,
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.disable = ams_delta_panel_disable,
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};
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/* platform driver section */
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static int ams_delta_panel_probe(struct platform_device *pdev)
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{
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struct lcd_device *lcd_device = NULL;
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int ret;
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gpiod_vblen = devm_gpiod_get(&pdev->dev, "vblen", GPIOD_OUT_LOW);
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if (IS_ERR(gpiod_vblen))
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return dev_err_probe(&pdev->dev, PTR_ERR(gpiod_vblen),
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"VBLEN GPIO request failed\n");
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gpiod_ndisp = devm_gpiod_get(&pdev->dev, "ndisp", GPIOD_OUT_LOW);
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if (IS_ERR(gpiod_ndisp))
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return dev_err_probe(&pdev->dev, PTR_ERR(gpiod_ndisp),
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"NDISP GPIO request failed\n");
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#ifdef CONFIG_LCD_CLASS_DEVICE
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lcd_device = lcd_device_register("omapfb", &pdev->dev, NULL,
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&ams_delta_lcd_ops);
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if (IS_ERR(lcd_device)) {
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ret = PTR_ERR(lcd_device);
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dev_err(&pdev->dev, "failed to register device\n");
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return ret;
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}
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platform_set_drvdata(pdev, lcd_device);
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lcd_device->props.max_contrast = AMS_DELTA_MAX_CONTRAST;
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#endif
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ams_delta_lcd_set_contrast(lcd_device, AMS_DELTA_DEFAULT_CONTRAST);
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ams_delta_lcd_set_power(lcd_device, FB_BLANK_UNBLANK);
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omapfb_register_panel(&ams_delta_panel);
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return 0;
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}
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static struct platform_driver ams_delta_panel_driver = {
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.probe = ams_delta_panel_probe,
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.driver = {
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.name = "lcd_ams_delta",
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},
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};
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module_platform_driver(ams_delta_panel_driver);
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MODULE_AUTHOR("Jonathan McDowell <noodles@earth.li>");
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MODULE_DESCRIPTION("LCD panel support for the Amstrad E3 (Delta) videophone");
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MODULE_LICENSE("GPL");
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