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path: root/drivers/video/backlight/omap1_bl.c
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Diffstat (limited to 'drivers/video/backlight/omap1_bl.c')
-rw-r--r--drivers/video/backlight/omap1_bl.c175
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 000000000..69a49384b
--- /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");