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Date: Wed, 06 Feb 2008 13:34:12 +0100
From: Roel Kluin <12o3l@...cali.nl>
To: Kristoffer Ericson <kristoffer.ericson@...il.com>
CC: Russell King <linux@....linux.org.uk>, rpurdie@...nedhand.com,
Linux-arm <linux-arm-kernel@...ts.arm.linux.org.uk>,
linux-main <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH/HP7XX] - Add combined LCD / BL driver for platform HP
Jornada 7xx handhelds
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
> new file mode 100644
> index 0000000..4967b86
> --- /dev/null
> +++ b/drivers/video/backlight/jornada720_bllcd.c
> @@ -0,0 +1,284 @@
> +/*
> + * drivers/video/backlight/jornada720_bllcd.c
> + *
> + * Backlight and LCD Driver for HP Jornada 720
> + * Copyright (C) 2007 Kristoffer Ericson <Kristoffer.Ericson@...il.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@...il.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 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);
> +
> + jornada_ssp_end();
> +
> + /* 0 is max brightness */
> + return (255 - ret);
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");
> + else {
> + /* backlight off */
> + PPSR &= ~PPC_LDD1;
> + PPDR |= PPC_LDD1;
> + }
> + } else {/* backlight on */
> + PPSR |= PPC_LDD1;
missing curly bracket
> +
> + if ((jornada_ssp_inout(SETBRIGHTNESS)) == TXDUMMY) {
> + /* send brightness value (0 is max, 255 lowest) */
> + if (jornada_ssp_byte(255 - dev->props.brightness) != -ETIMEDOUT)
> + ret = (255 - dev->props.brightness);
similarly JORNADA_BL_MAX_BRIGHTNESS in the three lines above
> + } 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_INFO "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;
wrong indent
> +
> + 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_INFO "jornada_lcd: getcontrast failed!\n");
> + ret = 256;
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_bl",
> + },
> +};
> +
> +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);
--
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