Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / video / backlight / jornada720_bl.c

diff --git a/kernel/drivers/video/backlight/jornada720_bl.c b/kernel/drivers/video/backlight/jornada720_bl.c
new file mode 100644 (file)
index 0000000..7e6ff53
--- /dev/null
+++ b/kernel/drivers/video/backlight/jornada720_bl.c
@@ -0,0 +1,154 @@
+/*
+ *
+ * Backlight driver for HP Jornada 700 series (710/720/728)
+ * Copyright (C) 2006-2009 Kristoffer Ericson <kristoffer.ericson@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 or any later version as published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/backlight.h>
+#include <linux/device.h>
+#include <linux/fb.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include <mach/jornada720.h>
+#include <mach/hardware.h>
+
+#include <video/s1d13xxxfb.h>
+
+#define BL_MAX_BRIGHT  255
+#define BL_DEF_BRIGHT  25
+
+static int jornada_bl_get_brightness(struct backlight_device *bd)
+{
+       int ret;
+
+       /* check if backlight is on */
+       if (!(PPSR & PPC_LDD1))
+               return 0;
+
+       jornada_ssp_start();
+
+       /* cmd should return txdummy */
+       ret = jornada_ssp_byte(GETBRIGHTNESS);
+
+       if (jornada_ssp_byte(GETBRIGHTNESS) != TXDUMMY) {
+               dev_err(&bd->dev, "get brightness timeout\n");
+               jornada_ssp_end();
+               return -ETIMEDOUT;
+       }
+
+       /* exchange txdummy for value */
+       ret = jornada_ssp_byte(TXDUMMY);
+
+       jornada_ssp_end();
+
+       return BL_MAX_BRIGHT - ret;
+}
+
+static int jornada_bl_update_status(struct backlight_device *bd)
+{
+       int ret = 0;
+
+       jornada_ssp_start();
+
+       /* If backlight is off then really turn it off */
+       if ((bd->props.power != FB_BLANK_UNBLANK) || (bd->props.fb_blank != FB_BLANK_UNBLANK)) {
+               ret = jornada_ssp_byte(BRIGHTNESSOFF);
+               if (ret != TXDUMMY) {
+                       dev_info(&bd->dev, "brightness off timeout\n");
+                       /* turn off backlight */
+                       PPSR &= ~PPC_LDD1;
+                       PPDR |= PPC_LDD1;
+                       ret = -ETIMEDOUT;
+               }
+       } else  /* turn on backlight */
+               PPSR |= PPC_LDD1;
+
+               /* send command to our mcu */
+               if (jornada_ssp_byte(SETBRIGHTNESS) != TXDUMMY) {
+                       dev_info(&bd->dev, "failed to set brightness\n");
+                       ret = -ETIMEDOUT;
+                       goto out;
+               }
+
+               /*
+                * at this point we expect that the mcu has accepted
+                * our command and is waiting for our new value
+                * please note that maximum brightness is 255,
+                * but due to physical layout it is equal to 0, so we simply
+                * invert the value (MAX VALUE - NEW VALUE).
+                */
+               if (jornada_ssp_byte(BL_MAX_BRIGHT - bd->props.brightness)
+                       != TXDUMMY) {
+                       dev_err(&bd->dev, "set brightness failed\n");
+                       ret = -ETIMEDOUT;
+               }
+
+               /*
+                * If infact we get an TXDUMMY as output we are happy and dont
+                * make any further comments about it
+                */
+out:
+       jornada_ssp_end();
+
+       return ret;
+}
+
+static const struct backlight_ops jornada_bl_ops = {
+       .get_brightness = jornada_bl_get_brightness,
+       .update_status = jornada_bl_update_status,
+       .options = BL_CORE_SUSPENDRESUME,
+};
+
+static int jornada_bl_probe(struct platform_device *pdev)
+{
+       struct backlight_properties props;
+       int ret;
+       struct backlight_device *bd;
+
+       memset(&props, 0, sizeof(struct backlight_properties));
+       props.type = BACKLIGHT_RAW;
+       props.max_brightness = BL_MAX_BRIGHT;
+
+       bd = devm_backlight_device_register(&pdev->dev, S1D_DEVICENAME,
+                                       &pdev->dev, NULL, &jornada_bl_ops,
+                                       &props);
+       if (IS_ERR(bd)) {
+               ret = PTR_ERR(bd);
+               dev_err(&pdev->dev, "failed to register device, err=%x\n", ret);
+               return ret;
+       }
+
+       bd->props.power = FB_BLANK_UNBLANK;
+       bd->props.brightness = BL_DEF_BRIGHT;
+       /*
+        * note. make sure max brightness is set otherwise
+        * you will get seemingly non-related errors when
+        * trying to change brightness
+        */
+       jornada_bl_update_status(bd);
+
+       platform_set_drvdata(pdev, bd);
+       dev_info(&pdev->dev, "HP Jornada 700 series backlight driver\n");
+
+       return 0;
+}
+
+static struct platform_driver jornada_bl_driver = {
+       .probe          = jornada_bl_probe,
+       .driver = {
+               .name   = "jornada_bl",
+       },
+};
+
+module_platform_driver(jornada_bl_driver);
+
+MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson>");
+MODULE_DESCRIPTION("HP Jornada 710/720/728 Backlight driver");
+MODULE_LICENSE("GPL");