2 * Backlight Driver for Frontpath ProGear HX1050+
4 * Copyright (c) 2006 Marcin Juszkiewicz
6 * Based on Progear LCD driver by M Schacht
7 * <mschacht at alumni dot washington dot edu>
9 * Based on Sharp's Corgi Backlight Driver
10 * Based on Backlight Driver for HP Jornada 680
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation.
18 #include <linux/module.h>
19 #include <linux/kernel.h>
20 #include <linux/init.h>
21 #include <linux/platform_device.h>
22 #include <linux/mutex.h>
24 #include <linux/backlight.h>
25 #include <linux/pci.h>
29 #define HW_LEVEL_MAX 0x77
30 #define HW_LEVEL_MIN 0x4f
32 static struct pci_dev
*pmu_dev
= NULL
;
33 static struct pci_dev
*sb_dev
= NULL
;
35 static int progearbl_set_intensity(struct backlight_device
*bd
)
37 int intensity
= bd
->props
.brightness
;
39 if (bd
->props
.power
!= FB_BLANK_UNBLANK
)
41 if (bd
->props
.fb_blank
!= FB_BLANK_UNBLANK
)
44 pci_write_config_byte(pmu_dev
, PMU_LPCR
, intensity
+ HW_LEVEL_MIN
);
49 static int progearbl_get_intensity(struct backlight_device
*bd
)
52 pci_read_config_byte(pmu_dev
, PMU_LPCR
, &intensity
);
54 return intensity
- HW_LEVEL_MIN
;
57 static const struct backlight_ops progearbl_ops
= {
58 .get_brightness
= progearbl_get_intensity
,
59 .update_status
= progearbl_set_intensity
,
62 static int progearbl_probe(struct platform_device
*pdev
)
65 struct backlight_device
*progear_backlight_device
;
68 pmu_dev
= pci_get_device(PCI_VENDOR_ID_AL
, PCI_DEVICE_ID_AL_M7101
, NULL
);
70 printk("ALI M7101 PMU not found.\n");
74 sb_dev
= pci_get_device(PCI_VENDOR_ID_AL
, PCI_DEVICE_ID_AL_M1533
, NULL
);
76 printk("ALI 1533 SB not found.\n");
81 /* Set SB_MPS1 to enable brightness control. */
82 pci_read_config_byte(sb_dev
, SB_MPS1
, &temp
);
83 pci_write_config_byte(sb_dev
, SB_MPS1
, temp
| 0x20);
85 progear_backlight_device
= backlight_device_register("progear-bl",
88 if (IS_ERR(progear_backlight_device
)) {
89 ret
= PTR_ERR(progear_backlight_device
);
93 platform_set_drvdata(pdev
, progear_backlight_device
);
95 progear_backlight_device
->props
.power
= FB_BLANK_UNBLANK
;
96 progear_backlight_device
->props
.brightness
= HW_LEVEL_MAX
- HW_LEVEL_MIN
;
97 progear_backlight_device
->props
.max_brightness
= HW_LEVEL_MAX
- HW_LEVEL_MIN
;
98 progearbl_set_intensity(progear_backlight_device
);
104 pci_dev_put(pmu_dev
);
108 static int progearbl_remove(struct platform_device
*pdev
)
110 struct backlight_device
*bd
= platform_get_drvdata(pdev
);
111 backlight_device_unregister(bd
);
116 static struct platform_driver progearbl_driver
= {
117 .probe
= progearbl_probe
,
118 .remove
= progearbl_remove
,
120 .name
= "progear-bl",
124 static struct platform_device
*progearbl_device
;
126 static int __init
progearbl_init(void)
128 int ret
= platform_driver_register(&progearbl_driver
);
132 progearbl_device
= platform_device_register_simple("progear-bl", -1,
134 if (IS_ERR(progearbl_device
)) {
135 platform_driver_unregister(&progearbl_driver
);
136 return PTR_ERR(progearbl_device
);
142 static void __exit
progearbl_exit(void)
144 pci_dev_put(pmu_dev
);
147 platform_device_unregister(progearbl_device
);
148 platform_driver_unregister(&progearbl_driver
);
151 module_init(progearbl_init
);
152 module_exit(progearbl_exit
);
154 MODULE_AUTHOR("Marcin Juszkiewicz <linux@hrw.one.pl>");
155 MODULE_DESCRIPTION("ProGear Backlight Driver");
156 MODULE_LICENSE("GPL");