1 files changed, 287 insertions, 0 deletions

diff --git a/drivers/video/backlight/cr_bllcd.c b/drivers/video/backlight/cr_bllcd.c
new file mode 100644
index 000000000000..e9bbc3455c94
--- /dev/null
+++ b/drivers/video/backlight/cr_bllcd.c
@@ -0,0 +1,287 @@
+/*
+ * 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");