drivers/video/backlight/cr_bllcd.c - third_party/linux - Git at Google

 /*
  * Copyright (c) Intel Corp. 2007.
  * All Rights Reserved.
  *
  * Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
  * develop this driver.
  *
  * This file is part of the Carillo Ranch video subsystem driver.
  * The Carillo Ranch video subsystem driver is free software;
  * you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * The Carillo Ranch video subsystem driver is distributed
  * in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this driver; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  *
  * Authors:
  *   Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
  *   Alan Hourihane <alanh-at-tungstengraphics-dot-com>
  */

 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/platform_device.h>
 #include <linux/mutex.h>
 #include <linux/fb.h>
 #include <linux/backlight.h>
 #include <linux/lcd.h>
 #include <linux/pci.h>

 /* The LVDS- and panel power controls sits on the
  * GPIO port of the ISA bridge.
  */

 #define CRVML_DEVICE_LPC    0x27B8
 #define CRVML_REG_GPIOBAR   0x48
 #define CRVML_REG_GPIOEN    0x4C
 #define CRVML_GPIOEN_BIT    (1 << 4)
 #define CRVML_PANEL_PORT    0x38
 #define CRVML_LVDS_ON       0x00000001
 #define CRVML_PANEL_ON      0x00000002
 #define CRVML_BACKLIGHT_OFF 0x00000004

 /* The PLL Clock register sits on Host bridge */
 #define CRVML_DEVICE_MCH   0x5001
 #define CRVML_REG_MCHBAR   0x44
 #define CRVML_REG_MCHEN    0x54
 #define CRVML_MCHEN_BIT    (1 << 28)
 #define CRVML_MCHMAP_SIZE  4096
 #define CRVML_REG_CLOCK    0xc3c
 #define CRVML_CLOCK_SHIFT  8
 #define CRVML_CLOCK_MASK   0x00000f00

 static struct pci_dev *lpc_dev;
 static u32 gpio_bar;

 struct cr_panel {
 	struct backlight_device *cr_backlight_device;
 	struct lcd_device *cr_lcd_device;
 };

 static int cr_backlight_set_intensity(struct backlight_device *bd)
 {
 	int intensity = bd->props.brightness;
 	u32 addr = gpio_bar + CRVML_PANEL_PORT;
 	u32 cur = inl(addr);

 	if (bd->props.power == FB_BLANK_UNBLANK)
 		intensity = FB_BLANK_UNBLANK;
 	if (bd->props.fb_blank == FB_BLANK_UNBLANK)
 		intensity = FB_BLANK_UNBLANK;
 	if (bd->props.power == FB_BLANK_POWERDOWN)
 		intensity = FB_BLANK_POWERDOWN;
 	if (bd->props.fb_blank == FB_BLANK_POWERDOWN)
 		intensity = FB_BLANK_POWERDOWN;

 	if (intensity == FB_BLANK_UNBLANK) { /* FULL ON */
 		cur &= ~CRVML_BACKLIGHT_OFF;
 		outl(cur, addr);
 	} else if (intensity == FB_BLANK_POWERDOWN) { /* OFF */
 		cur |= CRVML_BACKLIGHT_OFF;
 		outl(cur, addr);
 	} /* anything else, don't bother */

 	return 0;
 }

 static int cr_backlight_get_intensity(struct backlight_device *bd)
 {
 	u32 addr = gpio_bar + CRVML_PANEL_PORT;
 	u32 cur = inl(addr);
 	u8 intensity;

 	if (cur & CRVML_BACKLIGHT_OFF)
 		intensity = FB_BLANK_POWERDOWN;
 	else
 		intensity = FB_BLANK_UNBLANK;

 	return intensity;
 }

 static struct backlight_ops cr_backlight_ops = {
 	.get_brightness = cr_backlight_get_intensity,
 	.update_status = cr_backlight_set_intensity,
 };

 static void cr_panel_on(void)
 {
 	u32 addr = gpio_bar + CRVML_PANEL_PORT;
 	u32 cur = inl(addr);

 	if (!(cur & CRVML_PANEL_ON)) {
 		/* Make sure LVDS controller is down. */
 		if (cur & 0x00000001) {
 			cur &= ~CRVML_LVDS_ON;
 			outl(cur, addr);
 		}
 		/* Power up Panel */
 		schedule_timeout(HZ / 10);
 		cur |= CRVML_PANEL_ON;
 		outl(cur, addr);
 	}

 	/* Power up LVDS controller */

 	if (!(cur & CRVML_LVDS_ON)) {
 		schedule_timeout(HZ / 10);
 		outl(cur | CRVML_LVDS_ON, addr);
 	}
 }

 static void cr_panel_off(void)
 {
 	u32 addr = gpio_bar + CRVML_PANEL_PORT;
 	u32 cur = inl(addr);

 	/* Power down LVDS controller first to avoid high currents */
 	if (cur & CRVML_LVDS_ON) {
 		cur &= ~CRVML_LVDS_ON;
 		outl(cur, addr);
 	}
 	if (cur & CRVML_PANEL_ON) {
 		schedule_timeout(HZ / 10);
 		outl(cur & ~CRVML_PANEL_ON, addr);
 	}
 }

 static int cr_lcd_set_power(struct lcd_device *ld, int power)
 {
 	if (power == FB_BLANK_UNBLANK)
 		cr_panel_on();
 	if (power == FB_BLANK_POWERDOWN)
 		cr_panel_off();

 	return 0;
 }

 static struct lcd_ops cr_lcd_ops = {
 	.set_power = cr_lcd_set_power,
 };

 static int cr_backlight_probe(struct platform_device *pdev)
 {
 	struct backlight_device *bdp;
 	struct lcd_device *ldp;
 	struct cr_panel *crp;
 	u8 dev_en;

 	lpc_dev = pci_get_device(PCI_VENDOR_ID_INTEL,
 					CRVML_DEVICE_LPC, NULL);
 	if (!lpc_dev) {
 		printk("INTEL CARILLO RANCH LPC not found.\n");
 		return -ENODEV;
 	}

 	pci_read_config_byte(lpc_dev, CRVML_REG_GPIOEN, &dev_en);
 	if (!(dev_en & CRVML_GPIOEN_BIT)) {
 		printk(KERN_ERR
 		       "Carillo Ranch GPIO device was not enabled.\n");
 		pci_dev_put(lpc_dev);
 		return -ENODEV;
 	}

 	bdp = backlight_device_register("cr-backlight",
 					&pdev->dev, NULL, &cr_backlight_ops);
 	if (IS_ERR(bdp)) {
 		pci_dev_put(lpc_dev);
 		return PTR_ERR(bdp);
 	}

 	ldp = lcd_device_register("cr-lcd", &pdev->dev, NULL, &cr_lcd_ops);
 	if (IS_ERR(ldp)) {
 		backlight_device_unregister(bdp);
 		pci_dev_put(lpc_dev);
 		return PTR_ERR(bdp);
 	}

 	pci_read_config_dword(lpc_dev, CRVML_REG_GPIOBAR,
 			      &gpio_bar);
 	gpio_bar &= ~0x3F;

 	crp = kzalloc(sizeof(*crp), GFP_KERNEL);
 	if (!crp) {
 		lcd_device_unregister(ldp);
 		backlight_device_unregister(bdp);
 		pci_dev_put(lpc_dev);
 		return -ENOMEM;
 	}

 	crp->cr_backlight_device = bdp;
 	crp->cr_lcd_device = ldp;
 	crp->cr_backlight_device->props.power = FB_BLANK_UNBLANK;
 	crp->cr_backlight_device->props.brightness = 0;
 	crp->cr_backlight_device->props.max_brightness = 0;
 	cr_backlight_set_intensity(crp->cr_backlight_device);

 	cr_lcd_set_power(crp->cr_lcd_device, FB_BLANK_UNBLANK);

 	platform_set_drvdata(pdev, crp);

 	return 0;
 }

 static int cr_backlight_remove(struct platform_device *pdev)
 {
 	struct cr_panel *crp = platform_get_drvdata(pdev);
 	crp->cr_backlight_device->props.power = FB_BLANK_POWERDOWN;
 	crp->cr_backlight_device->props.brightness = 0;
 	crp->cr_backlight_device->props.max_brightness = 0;
 	cr_backlight_set_intensity(crp->cr_backlight_device);
 	cr_lcd_set_power(crp->cr_lcd_device, FB_BLANK_POWERDOWN);
 	backlight_device_unregister(crp->cr_backlight_device);
 	lcd_device_unregister(crp->cr_lcd_device);
 	pci_dev_put(lpc_dev);

 	return 0;
 }

 static struct platform_driver cr_backlight_driver = {
 	.probe = cr_backlight_probe,
 	.remove = cr_backlight_remove,
 	.driver = {
 		   .name = "cr_backlight",
 		   },
 };

 static struct platform_device *crp;

 static int __init cr_backlight_init(void)
 {
 	int ret = platform_driver_register(&cr_backlight_driver);

 	if (!ret) {
 		crp = platform_device_alloc("cr_backlight", -1);
 		if (!crp)
 			return -ENOMEM;

 		ret = platform_device_add(crp);

 		if (ret) {
 			platform_device_put(crp);
 			platform_driver_unregister(&cr_backlight_driver);
 		}
 	}

 	printk("Carillo Ranch Backlight Driver Initialized.\n");

 	return ret;
 }

 static void __exit cr_backlight_exit(void)
 {
 	platform_device_unregister(crp);
 	platform_driver_unregister(&cr_backlight_driver);
 }

 module_init(cr_backlight_init);
 module_exit(cr_backlight_exit);

 MODULE_AUTHOR("Tungsten Graphics Inc.");
 MODULE_DESCRIPTION("Carillo Ranch Backlight Driver");
 MODULE_LICENSE("GPL");
	/*
	* Copyright (c) Intel Corp. 2007.
	* All Rights Reserved.
	*
	* Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
	* develop this driver.
	*
	* This file is part of the Carillo Ranch video subsystem driver.
	* The Carillo Ranch video subsystem driver is free software;
	* you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* The Carillo Ranch video subsystem driver is distributed
	* in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this driver; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	*
	* Authors:
	* Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
	* Alan Hourihane <alanh-at-tungstengraphics-dot-com>
	*/

	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/init.h>
	#include <linux/platform_device.h>
	#include <linux/mutex.h>
	#include <linux/fb.h>
	#include <linux/backlight.h>
	#include <linux/lcd.h>
	#include <linux/pci.h>

	/* The LVDS- and panel power controls sits on the
	* GPIO port of the ISA bridge.
	*/

	#define CRVML_DEVICE_LPC 0x27B8
	#define CRVML_REG_GPIOBAR 0x48
	#define CRVML_REG_GPIOEN 0x4C
	#define CRVML_GPIOEN_BIT (1 << 4)
	#define CRVML_PANEL_PORT 0x38
	#define CRVML_LVDS_ON 0x00000001
	#define CRVML_PANEL_ON 0x00000002
	#define CRVML_BACKLIGHT_OFF 0x00000004

	/* The PLL Clock register sits on Host bridge */
	#define CRVML_DEVICE_MCH 0x5001
	#define CRVML_REG_MCHBAR 0x44
	#define CRVML_REG_MCHEN 0x54
	#define CRVML_MCHEN_BIT (1 << 28)
	#define CRVML_MCHMAP_SIZE 4096
	#define CRVML_REG_CLOCK 0xc3c
	#define CRVML_CLOCK_SHIFT 8
	#define CRVML_CLOCK_MASK 0x00000f00

	static struct pci_dev *lpc_dev;
	static u32 gpio_bar;

	struct cr_panel {
	struct backlight_device *cr_backlight_device;
	struct lcd_device *cr_lcd_device;
	};

	static int cr_backlight_set_intensity(struct backlight_device *bd)
	{
	int intensity = bd->props.brightness;
	u32 addr = gpio_bar + CRVML_PANEL_PORT;
	u32 cur = inl(addr);

	if (bd->props.power == FB_BLANK_UNBLANK)
	intensity = FB_BLANK_UNBLANK;
	if (bd->props.fb_blank == FB_BLANK_UNBLANK)
	intensity = FB_BLANK_UNBLANK;
	if (bd->props.power == FB_BLANK_POWERDOWN)
	intensity = FB_BLANK_POWERDOWN;
	if (bd->props.fb_blank == FB_BLANK_POWERDOWN)
	intensity = FB_BLANK_POWERDOWN;

	if (intensity == FB_BLANK_UNBLANK) { /* FULL ON */
	cur &= ~CRVML_BACKLIGHT_OFF;
	outl(cur, addr);
	} else if (intensity == FB_BLANK_POWERDOWN) { /* OFF */
	cur \|= CRVML_BACKLIGHT_OFF;
	outl(cur, addr);
	} /* anything else, don't bother */

	return 0;
	}

	static int cr_backlight_get_intensity(struct backlight_device *bd)
	{
	u32 addr = gpio_bar + CRVML_PANEL_PORT;
	u32 cur = inl(addr);
	u8 intensity;

	if (cur & CRVML_BACKLIGHT_OFF)
	intensity = FB_BLANK_POWERDOWN;
	else
	intensity = FB_BLANK_UNBLANK;

	return intensity;
	}

	static struct backlight_ops cr_backlight_ops = {
	.get_brightness = cr_backlight_get_intensity,
	.update_status = cr_backlight_set_intensity,
	};

	static void cr_panel_on(void)
	{
	u32 addr = gpio_bar + CRVML_PANEL_PORT;
	u32 cur = inl(addr);

	if (!(cur & CRVML_PANEL_ON)) {
	/* Make sure LVDS controller is down. */
	if (cur & 0x00000001) {
	cur &= ~CRVML_LVDS_ON;
	outl(cur, addr);
	}
	/* Power up Panel */
	schedule_timeout(HZ / 10);
	cur \|= CRVML_PANEL_ON;
	outl(cur, addr);
	}

	/* Power up LVDS controller */

	if (!(cur & CRVML_LVDS_ON)) {
	schedule_timeout(HZ / 10);
	outl(cur \| CRVML_LVDS_ON, addr);
	}
	}

	static void cr_panel_off(void)
	{
	u32 addr = gpio_bar + CRVML_PANEL_PORT;
	u32 cur = inl(addr);

	/* Power down LVDS controller first to avoid high currents */
	if (cur & CRVML_LVDS_ON) {
	cur &= ~CRVML_LVDS_ON;
	outl(cur, addr);
	}
	if (cur & CRVML_PANEL_ON) {
	schedule_timeout(HZ / 10);
	outl(cur & ~CRVML_PANEL_ON, addr);
	}
	}

	static int cr_lcd_set_power(struct lcd_device *ld, int power)
	{
	if (power == FB_BLANK_UNBLANK)
	cr_panel_on();
	if (power == FB_BLANK_POWERDOWN)
	cr_panel_off();

	return 0;
	}

	static struct lcd_ops cr_lcd_ops = {
	.set_power = cr_lcd_set_power,
	};

	static int cr_backlight_probe(struct platform_device *pdev)
	{
	struct backlight_device *bdp;
	struct lcd_device *ldp;
	struct cr_panel *crp;
	u8 dev_en;

	lpc_dev = pci_get_device(PCI_VENDOR_ID_INTEL,
	CRVML_DEVICE_LPC, NULL);
	if (!lpc_dev) {
	printk("INTEL CARILLO RANCH LPC not found.\n");
	return -ENODEV;
	}

	pci_read_config_byte(lpc_dev, CRVML_REG_GPIOEN, &dev_en);
	if (!(dev_en & CRVML_GPIOEN_BIT)) {
	printk(KERN_ERR
	"Carillo Ranch GPIO device was not enabled.\n");
	pci_dev_put(lpc_dev);
	return -ENODEV;
	}

	bdp = backlight_device_register("cr-backlight",
	&pdev->dev, NULL, &cr_backlight_ops);
	if (IS_ERR(bdp)) {
	pci_dev_put(lpc_dev);
	return PTR_ERR(bdp);
	}

	ldp = lcd_device_register("cr-lcd", &pdev->dev, NULL, &cr_lcd_ops);
	if (IS_ERR(ldp)) {
	backlight_device_unregister(bdp);
	pci_dev_put(lpc_dev);
	return PTR_ERR(bdp);
	}

	pci_read_config_dword(lpc_dev, CRVML_REG_GPIOBAR,
	&gpio_bar);
	gpio_bar &= ~0x3F;

	crp = kzalloc(sizeof(*crp), GFP_KERNEL);
	if (!crp) {
	lcd_device_unregister(ldp);
	backlight_device_unregister(bdp);
	pci_dev_put(lpc_dev);
	return -ENOMEM;
	}

	crp->cr_backlight_device = bdp;
	crp->cr_lcd_device = ldp;
	crp->cr_backlight_device->props.power = FB_BLANK_UNBLANK;
	crp->cr_backlight_device->props.brightness = 0;
	crp->cr_backlight_device->props.max_brightness = 0;
	cr_backlight_set_intensity(crp->cr_backlight_device);

	cr_lcd_set_power(crp->cr_lcd_device, FB_BLANK_UNBLANK);

	platform_set_drvdata(pdev, crp);

	return 0;
	}

	static int cr_backlight_remove(struct platform_device *pdev)
	{
	struct cr_panel *crp = platform_get_drvdata(pdev);
	crp->cr_backlight_device->props.power = FB_BLANK_POWERDOWN;
	crp->cr_backlight_device->props.brightness = 0;
	crp->cr_backlight_device->props.max_brightness = 0;
	cr_backlight_set_intensity(crp->cr_backlight_device);
	cr_lcd_set_power(crp->cr_lcd_device, FB_BLANK_POWERDOWN);
	backlight_device_unregister(crp->cr_backlight_device);
	lcd_device_unregister(crp->cr_lcd_device);
	pci_dev_put(lpc_dev);

	return 0;
	}

	static struct platform_driver cr_backlight_driver = {
	.probe = cr_backlight_probe,
	.remove = cr_backlight_remove,
	.driver = {
	.name = "cr_backlight",
	},
	};

	static struct platform_device *crp;

	static int __init cr_backlight_init(void)
	{
	int ret = platform_driver_register(&cr_backlight_driver);

	if (!ret) {
	crp = platform_device_alloc("cr_backlight", -1);
	if (!crp)
	return -ENOMEM;

	ret = platform_device_add(crp);

	if (ret) {
	platform_device_put(crp);
	platform_driver_unregister(&cr_backlight_driver);
	}
	}

	printk("Carillo Ranch Backlight Driver Initialized.\n");

	return ret;
	}

	static void __exit cr_backlight_exit(void)
	{
	platform_device_unregister(crp);
	platform_driver_unregister(&cr_backlight_driver);
	}

	module_init(cr_backlight_init);
	module_exit(cr_backlight_exit);

	MODULE_AUTHOR("Tungsten Graphics Inc.");
	MODULE_DESCRIPTION("Carillo Ranch Backlight Driver");
	MODULE_LICENSE("GPL");