/* * 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> */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #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 <linux/slab.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 const 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_properties props; 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) { pr_err("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)) { pr_err("Carillo Ranch GPIO device was not enabled.\n"); pci_dev_put(lpc_dev); return -ENODEV; } memset(&props, 0, sizeof(struct backlight_properties)); props.type = BACKLIGHT_RAW; bdp = backlight_device_register("cr-backlight", &pdev->dev, NULL, &cr_backlight_ops, &props); 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(ldp); } pci_read_config_dword(lpc_dev, CRVML_REG_GPIOBAR, &gpio_bar); gpio_bar &= ~0x3F; crp = devm_kzalloc(&pdev->dev, 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; 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) return ret; crp = platform_device_register_simple("cr_backlight", -1, NULL, 0); if (IS_ERR(crp)) { platform_driver_unregister(&cr_backlight_driver); return PTR_ERR(crp); } pr_info("Carillo Ranch Backlight Driver Initialized.\n"); return 0; } 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");