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Date: Wed, 6 Feb 2008 17:33:41 +0100
To: Roel Kluin <12o3l@tiscali.nl>
Cc: Kristoffer Ericson <kristoffer.ericson@gmail.com>,
       Russell King <linux@arm.linux.org.uk>, rpurdie@openedhand.com,
       Linux-arm <linux-arm-kernel@lists.arm.linux.org.uk>,
       linux-main <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH/HP7XX] - Add combined LCD / BL driver for platform HP
 Jornada 7xx handhelds
Message-Id: <20080206173341.619c52c8.Kristoffer.ericson@gmail.com>
In-Reply-To: <47A9AA4F.80508@tiscali.nl>
References: <20080205195331.fa2ca02b.Kristoffer.ericson@gmail.com>
	<47A9A944.7090401@tiscali.nl>
	<47A9AA4F.80508@tiscali.nl>
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From: Kristoffer Ericson <kristoffer.ericson@gmail.com>
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Oki, here is attempt #2 (btw, new mail or just keep thread?)

Tested to build and checkpatch.

diff --git a/drivers/video/backlight/jornada720_bllcd.c b/drivers/video/backlight/jornada720_bllcd.c
new file mode 100644
index 0000000..e911a5e
--- /dev/null
+++ b/drivers/video/backlight/jornada720_bllcd.c
@@ -0,0 +1,286 @@
+/*
+ * drivers/video/backlight/jornada720_bllcd.c
+ *
+ * Backlight and LCD Driver for HP Jornada 720
+ * Copyright (C) 2007 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/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/backlight.h>
+#include <linux/lcd.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/fb.h>
+#include <linux/device.h>
+#include <asm/hardware.h>
+#include <asm/arch/jornada720.h>
+#include <video/s1d13xxxfb.h>
+
+MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
+MODULE_DESCRIPTION("HP Jornada 710/720/728 Backlight/LCD Driver");
+MODULE_LICENSE("GPL");
+
+#define JORNADA_LCD_MAX_CONTRAST	0xff
+#define JORNADA_LCD_DEFAULT_CONTRAST	0x80
+#define JORNADA_BL_MAX_BRIGHTNESS	0xff
+#define JORNADA_BL_DEFAULT_BRIGHTNESS	0x19
+
+struct jornada_bllcd_device {
+	struct backlight_device *jorn_backlight_device;
+	struct lcd_device *jorn_lcd_device;
+};
+
+/*
+ * BACKLIGHT HANDLING ROUTINES
+ */
+static int jornada_bl_get_brightness(struct backlight_device *dev)
+{
+	int ret;
+
+	/* check if backlight is on */
+	if (!(PPSR & PPC_LDD1))
+		return JORNADA_BL_MAX_BRIGHTNESS;
+
+	jornada_ssp_start();
+	if (jornada_ssp_inout(GETBRIGHTNESS) == -ETIMEDOUT) {
+		printk(KERN_ERR "jornada720_bl: GetBrightness failed\n");
+		ret = JORNADA_BL_MAX_BRIGHTNESS + 1;
+	} else
+		ret = jornada_ssp_inout(TXDUMMY);
+
+	jornada_ssp_end();
+
+	/* 0 is max brightness */
+	return (JORNADA_BL_MAX_BRIGHTNESS - ret);
+}
+
+static int jornada_bl_update_status(struct backlight_device *dev)
+{
+	int ret = 0;
+
+	jornada_ssp_start();
+
+	if (dev->props.power != FB_BLANK_UNBLANK ||
+		dev->props.fb_blank != FB_BLANK_UNBLANK) {
+		ret = jornada_ssp_inout(BRIGHTNESSOFF);
+		if (ret == -ETIMEDOUT)
+			printk(KERN_ERR "jornada720_bl:	\
+				BrightnessOff timeout\n");
+			/* backlight off */
+			PPSR &= ~PPC_LDD1;
+			PPDR |= PPC_LDD1;
+
+	} else	{	/* backlight on */
+			PPSR |= PPC_LDD1;
+			if ((jornada_ssp_inout(SETBRIGHTNESS)) == TXDUMMY) {
+			    /* send brightness value (0 is max, 255 lowest) */
+				if (jornada_ssp_byte(JORNADA_BL_MAX_BRIGHTNESS -
+					 dev->props.brightness) != -ETIMEDOUT)
+				ret = (JORNADA_BL_MAX_BRIGHTNESS -
+					dev->props.brightness);
+			} else
+				printk(KERN_ERR "jornada720_bl:	\
+					SetBrightness timeout\n");
+		}
+	jornada_ssp_end();
+
+	return ret;
+}
+
+/*
+ * LCD HANDLING FUNCTIONS
+ */
+static int jornada_lcd_set_contrast(struct lcd_device *pdev, int contrast)
+{
+	int ret = 0;
+
+	jornada_ssp_start();
+
+	ret = jornada_ssp_inout(SETCONTRAST);
+
+	if (ret == -ETIMEDOUT)
+		printk(KERN_ERR "jornada_lcd: failure to set contrast\n");
+	 else
+		ret = jornada_ssp_byte(contrast);
+
+	jornada_ssp_end();
+
+	return ret;
+}
+
+static int jornada_lcd_set_power(struct lcd_device  *pdev, int power)
+{
+	if (power != FB_BLANK_UNBLANK) {
+		/* turn off LCD */
+		PPSR &= ~PPC_LDD2;
+		PPDR |= PPC_LDD2;
+	} else {
+		/* turn on LCD */
+		PPSR |= PPC_LDD2;
+		}
+
+	return 0;
+}
+
+static int jornada_lcd_get_power(struct lcd_device *pdev)
+{
+	if (PPSR & PPC_LDD2)
+		return FB_BLANK_UNBLANK;
+	else
+		return FB_BLANK_POWERDOWN;
+}
+
+static int jornada_lcd_get_contrast(struct lcd_device *pdev)
+{
+	int ret;
+
+	/* Don't set contrast on off powerd LCD */
+	if (jornada_lcd_get_power(pdev) != FB_BLANK_UNBLANK)
+		return 0;
+
+	jornada_ssp_start();
+
+	ret = jornada_ssp_inout(GETCONTRAST);
+	if (ret != -ETIMEDOUT)
+		ret = jornada_ssp_inout(TXDUMMY);
+	else {
+		printk(KERN_ERR "jornada_lcd: getcontrast failed!\n");
+		ret = JORNADA_BL_MAX_BRIGHTNESS + 1;
+	}
+
+	jornada_ssp_end();
+
+	return ret;
+}
+
+static struct backlight_ops jornada_bl_ops = {
+	.get_brightness = jornada_bl_get_brightness,
+	.update_status = jornada_bl_update_status,
+};
+
+static struct lcd_ops jornada_lcd_ops = {
+	.get_contrast = jornada_lcd_get_contrast,
+	.set_contrast = jornada_lcd_set_contrast,
+	.get_power = jornada_lcd_get_power,
+	.set_power = jornada_lcd_set_power,
+};
+
+static int jornada_bl_probe(struct platform_device *pdev)
+{
+	struct jornada_bllcd_device *bllcd;
+
+	bllcd = kzalloc(sizeof(*bllcd), GFP_KERNEL);
+	if (bllcd == NULL)
+		return -ENOMEM;
+
+	/* bl driver - name must match fb driver name */
+	bllcd->jorn_backlight_device = backlight_device_register(S1D_DEVICENAME,
+		&pdev->dev, NULL, &jornada_bl_ops);
+
+	if (IS_ERR(bllcd->jorn_backlight_device)) {
+		kfree(bllcd);
+		return PTR_ERR(bllcd->jorn_backlight_device);
+	}
+
+	/* lcd driver */
+	bllcd->jorn_lcd_device = lcd_device_register(S1D_DEVICENAME,
+				&pdev->dev, NULL, &jornada_lcd_ops);
+	if (IS_ERR(bllcd->jorn_lcd_device)) {
+		kfree(bllcd);
+		return PTR_ERR(bllcd->jorn_lcd_device);
+	}
+
+	jornada_lcd_set_contrast(bllcd->jorn_lcd_device,
+			JORNADA_LCD_DEFAULT_CONTRAST);
+	jornada_lcd_set_power(bllcd->jorn_lcd_device,
+			FB_BLANK_UNBLANK);
+
+	msleep(100);
+
+	bllcd->jorn_backlight_device->props.power
+		= FB_BLANK_UNBLANK;
+	bllcd->jorn_backlight_device->props.brightness
+		= JORNADA_BL_DEFAULT_BRIGHTNESS;
+	jornada_bl_update_status(bllcd->jorn_backlight_device);
+
+	platform_set_drvdata(pdev, bllcd);
+	printk(KERN_INFO "HP Jornada 7xx Backlight/LCD driver activated\n");
+
+	return 0;
+}
+
+static int jornada_bl_remove(struct platform_device *pdev)
+{
+	struct jornada_bllcd_device *bllcd = platform_get_drvdata(pdev);
+
+	bllcd->jorn_backlight_device->props.power = FB_BLANK_POWERDOWN;
+	bllcd->jorn_backlight_device->props.brightness = 0;
+	bllcd->jorn_backlight_device->props.max_brightness = 0;
+
+	backlight_device_unregister(bllcd->jorn_backlight_device);
+	lcd_device_unregister(bllcd->jorn_lcd_device);
+
+	return 0;
+}
+
+static int jornada_bl_suspend(struct platform_device *pdev, pm_message_t state)
+{
+	struct jornada_bllcd_device *bllcd = platform_get_drvdata(pdev);
+
+	bllcd->jorn_backlight_device->props.power = FB_BLANK_POWERDOWN;
+	bllcd->jorn_backlight_device->props.brightness = 0;
+	bllcd->jorn_backlight_device->props.max_brightness = 0;
+	jornada_bl_update_status(bllcd->jorn_backlight_device);
+
+	jornada_lcd_set_power(bllcd->jorn_lcd_device, FB_BLANK_POWERDOWN);
+
+	return 0;
+}
+
+static int jornada_bl_resume(struct platform_device *pdev)
+{
+	struct jornada_bllcd_device *bllcd = platform_get_drvdata(pdev);
+
+	bllcd->jorn_backlight_device->props.power
+		= FB_BLANK_UNBLANK;
+	bllcd->jorn_backlight_device->props.brightness
+		= JORNADA_BL_DEFAULT_BRIGHTNESS;
+	bllcd->jorn_backlight_device->props.max_brightness
+		= JORNADA_BL_MAX_BRIGHTNESS;
+	jornada_bl_update_status(bllcd->jorn_backlight_device);
+
+	jornada_lcd_set_power(bllcd->jorn_lcd_device, FB_BLANK_UNBLANK);
+
+	return 0;
+}
+
+static struct platform_driver jornada_bl_driver = {
+	.probe	= jornada_bl_probe,
+	.remove	= jornada_bl_remove,
+#ifdef CONFIG_PM
+	.suspend = jornada_bl_suspend,
+	.resume = jornada_bl_resume,
+#endif
+	.driver = {
+	    .name = "jornada_bllcd",
+	},
+};
+
+static int __init jornada_bl_init(void)
+{
+	return platform_driver_register(&jornada_bl_driver);
+}
+
+static void __exit jornada_bl_exit(void)
+{
+	platform_driver_unregister(&jornada_bl_driver);
+}
+
+module_init(jornada_bl_init);
+module_exit(jornada_bl_exit);

On Wed, 06 Feb 2008 13:38:39 +0100
Roel Kluin <12o3l@tiscali.nl> wrote:
> Roel Kluin wrote:
> > Kristoffer Ericson wrote:
> >> Greetings,
> >>
> >> Richard I've cleaned up the driver by checking with checkpatch.pl as Russell suggested. I would appreciate it if you could
> >> look through the patch again and give comments since the patch looks somewhat different.
> >>
> >> I can add patch for Kconfig/Makefile later on but suspect there will be some changes required before that.
> >>
> >> Oh and to answer your question regarding MAX/MIN values of the backlight, 0 = max and 255 = min. So we simply turn it around
> >> by returning 255 - value. Same thing when we need to set value.
> >>
> >> Best wishes
> >> Kristoffer Ericson
> >>
> >> diff --git a/drivers/video/backlight/jornada720_bllcd.c b/drivers/video/backlight/jornada720_bllcd.c
> 
> >> +static int jornada_bl_get_brightness(struct backlight_device *dev)
> >> +{
> >> +	int ret;
> >> +
> >> +	/* check if backlight is on */
> >> +	if (!(PPSR & PPC_LDD1))
> >> +		return 255;
> > return JORNADA_BL_MAX_BRIGHTNESS;
> > 
> >> +
> >> +	jornada_ssp_start();
> >> +	if (jornada_ssp_inout(GETBRIGHTNESS) == -ETIMEDOUT) {
> >> +		printk(KERN_ERR "jornada720_bl: GetBrightness failed\n");
> >> +		ret = 256;
> > ret = JORNADA_BL_MAX_BRIGHTNESS + 1;
> >> +	} else
> >> +		ret = jornada_ssp_inout(TXDUMMY);
> 
> forgot to mention missing curly bracket here
> 
> >> +
> >> +	jornada_ssp_end();
> >> +
> >> +	/* 0 is max brightness */
> >> +	return (255 - ret);
> > return (JORNADA_BL_MAX_BRIGHTNESS - ret);
> >> +}

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--Multipart=_Wed__6_Feb_2008_17_33_41_+0100_zmSlnqkEcDuPui=w--
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