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/*
* 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>
#include <asm/uaccess.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 cr_panel *crp;
u8 dev_en;
crp = kzalloc(sizeof(*crp), GFP_KERNEL);
if (crp == NULL)
return -ENOMEM;
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;
}
crp->cr_backlight_device = backlight_device_register("cr-backlight",
&pdev->dev, NULL,
&cr_backlight_ops);
if (IS_ERR(crp->cr_backlight_device)) {
pci_dev_put(lpc_dev);
return PTR_ERR(crp->cr_backlight_device);
}
crp->cr_lcd_device = lcd_device_register("cr-lcd",
&pdev->dev,
&cr_lcd_ops);
if (IS_ERR(crp->cr_lcd_device)) {
pci_dev_put(lpc_dev);
return PTR_ERR(crp->cr_backlight_device);
}
pci_read_config_dword(lpc_dev, CRVML_REG_GPIOBAR,
&gpio_bar);
gpio_bar &= ~0x3F;
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");
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