diff options
Diffstat (limited to 'drivers/video/fbdev/omap/lcd_ams_delta.c')
| -rw-r--r-- | drivers/video/fbdev/omap/lcd_ams_delta.c | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/drivers/video/fbdev/omap/lcd_ams_delta.c b/drivers/video/fbdev/omap/lcd_ams_delta.c new file mode 100644 index 000000000..6f860c814 --- /dev/null +++ b/drivers/video/fbdev/omap/lcd_ams_delta.c @@ -0,0 +1,175 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Based on drivers/video/omap/lcd_inn1510.c + * + * LCD panel support for the Amstrad E3 (Delta) videophone. + * + * Copyright (C) 2006 Jonathan McDowell <noodles@earth.li> + */ + +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/io.h> +#include <linux/delay.h> +#include <linux/gpio/consumer.h> +#include <linux/lcd.h> + +#include <linux/soc/ti/omap1-io.h> + +#include "omapfb.h" + +#define AMS_DELTA_DEFAULT_CONTRAST 112 + +#define AMS_DELTA_MAX_CONTRAST 0x00FF +#define AMS_DELTA_LCD_POWER 0x0100 + + +/* LCD class device section */ + +static int ams_delta_lcd; +static struct gpio_desc *gpiod_vblen; +static struct gpio_desc *gpiod_ndisp; + +static int ams_delta_lcd_set_power(struct lcd_device *dev, int power) +{ + if (power == FB_BLANK_UNBLANK) { + if (!(ams_delta_lcd & AMS_DELTA_LCD_POWER)) { + omap_writeb(ams_delta_lcd & AMS_DELTA_MAX_CONTRAST, + OMAP_PWL_ENABLE); + omap_writeb(1, OMAP_PWL_CLK_ENABLE); + ams_delta_lcd |= AMS_DELTA_LCD_POWER; + } + } else { + if (ams_delta_lcd & AMS_DELTA_LCD_POWER) { + omap_writeb(0, OMAP_PWL_ENABLE); + omap_writeb(0, OMAP_PWL_CLK_ENABLE); + ams_delta_lcd &= ~AMS_DELTA_LCD_POWER; + } + } + return 0; +} + +static int ams_delta_lcd_set_contrast(struct lcd_device *dev, int value) +{ + if ((value >= 0) && (value <= AMS_DELTA_MAX_CONTRAST)) { + omap_writeb(value, OMAP_PWL_ENABLE); + ams_delta_lcd &= ~AMS_DELTA_MAX_CONTRAST; + ams_delta_lcd |= value; + } + return 0; +} + +#ifdef CONFIG_LCD_CLASS_DEVICE +static int ams_delta_lcd_get_power(struct lcd_device *dev) +{ + if (ams_delta_lcd & AMS_DELTA_LCD_POWER) + return FB_BLANK_UNBLANK; + else + return FB_BLANK_POWERDOWN; +} + +static int ams_delta_lcd_get_contrast(struct lcd_device *dev) +{ + if (!(ams_delta_lcd & AMS_DELTA_LCD_POWER)) + return 0; + + return ams_delta_lcd & AMS_DELTA_MAX_CONTRAST; +} + +static struct lcd_ops ams_delta_lcd_ops = { + .get_power = ams_delta_lcd_get_power, + .set_power = ams_delta_lcd_set_power, + .get_contrast = ams_delta_lcd_get_contrast, + .set_contrast = ams_delta_lcd_set_contrast, +}; +#endif + + +/* omapfb panel section */ + +static int ams_delta_panel_enable(struct lcd_panel *panel) +{ + gpiod_set_value(gpiod_ndisp, 1); + gpiod_set_value(gpiod_vblen, 1); + return 0; +} + +static void ams_delta_panel_disable(struct lcd_panel *panel) +{ + gpiod_set_value(gpiod_vblen, 0); + gpiod_set_value(gpiod_ndisp, 0); +} + +static struct lcd_panel ams_delta_panel = { + .name = "ams-delta", + .config = 0, + + .bpp = 12, + .data_lines = 16, + .x_res = 480, + .y_res = 320, + .pixel_clock = 4687, + .hsw = 3, + .hfp = 1, + .hbp = 1, + .vsw = 1, + .vfp = 0, + .vbp = 0, + .pcd = 0, + .acb = 37, + + .enable = ams_delta_panel_enable, + .disable = ams_delta_panel_disable, +}; + + +/* platform driver section */ + +static int ams_delta_panel_probe(struct platform_device *pdev) +{ + struct lcd_device *lcd_device = NULL; + + gpiod_vblen = devm_gpiod_get(&pdev->dev, "vblen", GPIOD_OUT_LOW); + if (IS_ERR(gpiod_vblen)) + return dev_err_probe(&pdev->dev, PTR_ERR(gpiod_vblen), + "VBLEN GPIO request failed\n"); + + gpiod_ndisp = devm_gpiod_get(&pdev->dev, "ndisp", GPIOD_OUT_LOW); + if (IS_ERR(gpiod_ndisp)) + return dev_err_probe(&pdev->dev, PTR_ERR(gpiod_ndisp), + "NDISP GPIO request failed\n"); + +#ifdef CONFIG_LCD_CLASS_DEVICE + lcd_device = lcd_device_register("omapfb", &pdev->dev, NULL, + &ams_delta_lcd_ops); + + if (IS_ERR(lcd_device)) { + int ret = PTR_ERR(lcd_device); + + dev_err(&pdev->dev, "failed to register device\n"); + return ret; + } + + platform_set_drvdata(pdev, lcd_device); + lcd_device->props.max_contrast = AMS_DELTA_MAX_CONTRAST; +#endif + + ams_delta_lcd_set_contrast(lcd_device, AMS_DELTA_DEFAULT_CONTRAST); + ams_delta_lcd_set_power(lcd_device, FB_BLANK_UNBLANK); + + omapfb_register_panel(&ams_delta_panel); + return 0; +} + +static struct platform_driver ams_delta_panel_driver = { + .probe = ams_delta_panel_probe, + .driver = { + .name = "lcd_ams_delta", + }, +}; + +module_platform_driver(ams_delta_panel_driver); + +MODULE_AUTHOR("Jonathan McDowell <noodles@earth.li>"); +MODULE_DESCRIPTION("LCD panel support for the Amstrad E3 (Delta) videophone"); +MODULE_LICENSE("GPL"); |