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