diff options
Diffstat (limited to 'drivers/video/backlight/omap1_bl.c')
| -rw-r--r-- | drivers/video/backlight/omap1_bl.c | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/drivers/video/backlight/omap1_bl.c b/drivers/video/backlight/omap1_bl.c new file mode 100644 index 0000000000..69a49384b3 --- /dev/null +++ b/drivers/video/backlight/omap1_bl.c @@ -0,0 +1,175 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Backlight driver for OMAP based boards. + * + * Copyright (c) 2006 Andrzej Zaborowski <balrog@zabor.org> + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/platform_device.h> +#include <linux/fb.h> +#include <linux/backlight.h> +#include <linux/slab.h> +#include <linux/platform_data/omap1_bl.h> + +#include <linux/soc/ti/omap1-io.h> +#include <linux/soc/ti/omap1-mux.h> + +#define OMAPBL_MAX_INTENSITY 0xff + +struct omap_backlight { + int powermode; + int current_intensity; + + struct device *dev; + struct omap_backlight_config *pdata; +}; + +static inline void omapbl_send_intensity(int intensity) +{ + omap_writeb(intensity, OMAP_PWL_ENABLE); +} + +static inline void omapbl_send_enable(int enable) +{ + omap_writeb(enable, OMAP_PWL_CLK_ENABLE); +} + +static void omapbl_blank(struct omap_backlight *bl, int mode) +{ + if (bl->pdata->set_power) + bl->pdata->set_power(bl->dev, mode); + + switch (mode) { + case FB_BLANK_NORMAL: + case FB_BLANK_VSYNC_SUSPEND: + case FB_BLANK_HSYNC_SUSPEND: + case FB_BLANK_POWERDOWN: + omapbl_send_intensity(0); + omapbl_send_enable(0); + break; + + case FB_BLANK_UNBLANK: + omapbl_send_intensity(bl->current_intensity); + omapbl_send_enable(1); + break; + } +} + +#ifdef CONFIG_PM_SLEEP +static int omapbl_suspend(struct device *dev) +{ + struct backlight_device *bl_dev = dev_get_drvdata(dev); + struct omap_backlight *bl = bl_get_data(bl_dev); + + omapbl_blank(bl, FB_BLANK_POWERDOWN); + return 0; +} + +static int omapbl_resume(struct device *dev) +{ + struct backlight_device *bl_dev = dev_get_drvdata(dev); + struct omap_backlight *bl = bl_get_data(bl_dev); + + omapbl_blank(bl, bl->powermode); + return 0; +} +#endif + +static int omapbl_set_power(struct backlight_device *dev, int state) +{ + struct omap_backlight *bl = bl_get_data(dev); + + omapbl_blank(bl, state); + bl->powermode = state; + + return 0; +} + +static int omapbl_update_status(struct backlight_device *dev) +{ + struct omap_backlight *bl = bl_get_data(dev); + + if (bl->current_intensity != dev->props.brightness) { + if (bl->powermode == FB_BLANK_UNBLANK) + omapbl_send_intensity(dev->props.brightness); + bl->current_intensity = dev->props.brightness; + } + + if (dev->props.fb_blank != bl->powermode) + omapbl_set_power(dev, dev->props.fb_blank); + + return 0; +} + +static int omapbl_get_intensity(struct backlight_device *dev) +{ + struct omap_backlight *bl = bl_get_data(dev); + + return bl->current_intensity; +} + +static const struct backlight_ops omapbl_ops = { + .get_brightness = omapbl_get_intensity, + .update_status = omapbl_update_status, +}; + +static int omapbl_probe(struct platform_device *pdev) +{ + struct backlight_properties props; + struct backlight_device *dev; + struct omap_backlight *bl; + struct omap_backlight_config *pdata = dev_get_platdata(&pdev->dev); + + if (!pdata) + return -ENXIO; + + bl = devm_kzalloc(&pdev->dev, sizeof(struct omap_backlight), + GFP_KERNEL); + if (unlikely(!bl)) + return -ENOMEM; + + memset(&props, 0, sizeof(struct backlight_properties)); + props.type = BACKLIGHT_RAW; + props.max_brightness = OMAPBL_MAX_INTENSITY; + dev = devm_backlight_device_register(&pdev->dev, "omap-bl", &pdev->dev, + bl, &omapbl_ops, &props); + if (IS_ERR(dev)) + return PTR_ERR(dev); + + bl->powermode = FB_BLANK_POWERDOWN; + bl->current_intensity = 0; + + bl->pdata = pdata; + bl->dev = &pdev->dev; + + platform_set_drvdata(pdev, dev); + + omap_cfg_reg(PWL); /* Conflicts with UART3 */ + + dev->props.fb_blank = FB_BLANK_UNBLANK; + dev->props.brightness = pdata->default_intensity; + omapbl_update_status(dev); + + dev_info(&pdev->dev, "OMAP LCD backlight initialised\n"); + + return 0; +} + +static SIMPLE_DEV_PM_OPS(omapbl_pm_ops, omapbl_suspend, omapbl_resume); + +static struct platform_driver omapbl_driver = { + .probe = omapbl_probe, + .driver = { + .name = "omap-bl", + .pm = &omapbl_pm_ops, + }, +}; + +module_platform_driver(omapbl_driver); + +MODULE_AUTHOR("Andrzej Zaborowski <balrog@zabor.org>"); +MODULE_DESCRIPTION("OMAP LCD Backlight driver"); +MODULE_LICENSE("GPL"); |