/* * Backlight Driver for Frontpath ProGear HX1050+ * * Copyright (c) 2006 Marcin Juszkiewicz * * Based on Progear LCD driver by M Schacht * <mschacht at alumni dot washington dot edu> * * Based on Sharp's Corgi Backlight Driver * Based on Backlight Driver for HP Jornada 680 * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * */ #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/pci.h> #define PMU_LPCR 0xB0 #define SB_MPS1 0x61 #define HW_LEVEL_MAX 0x77 #define HW_LEVEL_MIN 0x4f static struct pci_dev *pmu_dev = NULL; static struct pci_dev *sb_dev = NULL; static int progearbl_set_intensity(struct backlight_device *bd) { int intensity = bd->props.brightness; if (bd->props.power != FB_BLANK_UNBLANK) intensity = 0; if (bd->props.fb_blank != FB_BLANK_UNBLANK) intensity = 0; pci_write_config_byte(pmu_dev, PMU_LPCR, intensity + HW_LEVEL_MIN); return 0; } static int progearbl_get_intensity(struct backlight_device *bd) { u8 intensity; pci_read_config_byte(pmu_dev, PMU_LPCR, &intensity); return intensity - HW_LEVEL_MIN; } static const struct backlight_ops progearbl_ops = { .get_brightness = progearbl_get_intensity, .update_status = progearbl_set_intensity, }; static int progearbl_probe(struct platform_device *pdev) { struct backlight_properties props; u8 temp; struct backlight_device *progear_backlight_device; int ret; pmu_dev = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M7101, NULL); if (!pmu_dev) { printk("ALI M7101 PMU not found.\n"); return -ENODEV; } sb_dev = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533, NULL); if (!sb_dev) { printk("ALI 1533 SB not found.\n"); ret = -ENODEV; goto put_pmu; } /* Set SB_MPS1 to enable brightness control. */ pci_read_config_byte(sb_dev, SB_MPS1, &temp); pci_write_config_byte(sb_dev, SB_MPS1, temp | 0x20); memset(&props, 0, sizeof(struct backlight_properties)); props.type = BACKLIGHT_RAW; props.max_brightness = HW_LEVEL_MAX - HW_LEVEL_MIN; progear_backlight_device = backlight_device_register("progear-bl", &pdev->dev, NULL, &progearbl_ops, &props); if (IS_ERR(progear_backlight_device)) { ret = PTR_ERR(progear_backlight_device); goto put_sb; } platform_set_drvdata(pdev, progear_backlight_device); progear_backlight_device->props.power = FB_BLANK_UNBLANK; progear_backlight_device->props.brightness = HW_LEVEL_MAX - HW_LEVEL_MIN; progearbl_set_intensity(progear_backlight_device); return 0; put_sb: pci_dev_put(sb_dev); put_pmu: pci_dev_put(pmu_dev); return ret; } static int progearbl_remove(struct platform_device *pdev) { struct backlight_device *bd = platform_get_drvdata(pdev); backlight_device_unregister(bd); return 0; } static struct platform_driver progearbl_driver = { .probe = progearbl_probe, .remove = progearbl_remove, .driver = { .name = "progear-bl", }, }; static struct platform_device *progearbl_device; static int __init progearbl_init(void) { int ret = platform_driver_register(&progearbl_driver); if (ret) return ret; progearbl_device = platform_device_register_simple("progear-bl", -1, NULL, 0); if (IS_ERR(progearbl_device)) { platform_driver_unregister(&progearbl_driver); return PTR_ERR(progearbl_device); } return 0; } static void __exit progearbl_exit(void) { pci_dev_put(pmu_dev); pci_dev_put(sb_dev); platform_device_unregister(progearbl_device); platform_driver_unregister(&progearbl_driver); } module_init(progearbl_init); module_exit(progearbl_exit); MODULE_AUTHOR("Marcin Juszkiewicz <linux@hrw.one.pl>"); MODULE_DESCRIPTION("ProGear Backlight Driver"); MODULE_LICENSE("GPL");