drivers/video/backlight/h2200_bl.c

   1 /*
   2  * LCD backlight support for iPAQ H2200
   3  *
   4  * Copyright (c) 2004 Andrew Zabolotny
   5  * Copyright (c) 2004-6 Matt Reimer
   6  *
   7  * This file is subject to the terms and conditions of the GNU General Public
   8  * License.  See the file COPYING in the main directory of this archive for
   9  * more details.
  10  */
  11
  12 #include <linux/platform_device.h>
  13 #include <asm/arch/hardware.h>
  14 #include <asm/arch/pxa-regs.h>
  15 #include <asm/arch/h2200-gpio.h>
  16 #include <asm/arch/sharpsl.h>
  17
  18 #define H2200_MAX_INTENSITY 0x3ff
  19
  20 static
  21 void h2200_set_bl_intensity(int intensity)
  22 {
  23         if (intensity < 7) intensity = 0;
  24
  25         PWM_CTRL0 = 1;
  26         PWM_PERVAL0 = H2200_MAX_INTENSITY;
  27         PWM_PWDUTY0 = intensity;
  28
  29         if (intensity) {
  30                 pxa_gpio_mode(GPIO16_PWM0_MD);
  31                 pxa_set_cken(CKEN0_PWM0, 1);
  32                 SET_H2200_GPIO(BACKLIGHT_ON, 1);
  33         } else {
  34                 pxa_set_cken(CKEN0_PWM0, 0);
  35                 SET_H2200_GPIO(BACKLIGHT_ON, 0);
  36         }
  37 }
  38
  39 static struct corgibl_machinfo h2200_bl_machinfo = {
  40         .max_intensity = H2200_MAX_INTENSITY,
  41         .default_intensity = H2200_MAX_INTENSITY,
  42         .limit_mask = 0xff, /* limit brightness to about 1/4 on low battery */
  43         .set_bl_intensity = h2200_set_bl_intensity,
  44 };
  45
  46 struct platform_device h2200_bl = {
  47         .name = "corgi-bl",
  48         .dev = {
  49                 .platform_data = &h2200_bl_machinfo,
  50         },
  51 };
  52
  53 static int __init h2200_bl_init(void)
  54 {
  55         return platform_device_register(&h2200_bl);
  56 }
  57
  58 static void __exit h2200_bl_exit(void)
  59 {
  60         platform_device_unregister(&h2200_bl);
  61 }
  62
  63 module_init(h2200_bl_init);
  64 module_exit(h2200_bl_exit);
  65
  66 MODULE_AUTHOR("Andrew Zabolotny, Matt Reimer <mreimer@vpop.net>");
  67 MODULE_DESCRIPTION("Backlight driver for iPAQ H2200");
  68 MODULE_LICENSE("GPL");