arch/arm/mach-pxa/asus730/a730_bl.c

   1 /*
   2  * Use consistent with the GNU GPL is permitted,
   3  * provided that this copyright notice is
   4  * preserved in its entirety in all copies and derived works.
   5  *
   6  * Copyright (C) 2006 Serge Nikolaenko
   7  *
   8  */
   9
  10 #include <linux/types.h>
  11 #include <asm/arch/hardware.h>  /* for pxa-regs.h (__REG) */
  12 #include <linux/platform_device.h>
  13 #include <asm/arch/pxa-regs.h>  /* LCCR[0,1,2,3]* */
  14 #include <asm/mach-types.h>
  15 #include <linux/backlight.h>    /* backlight_device */
  16 #include <linux/err.h>
  17
  18 #include <asm/arch/asus730-gpio.h>
  19 #include <asm/arch/sharpsl.h> /* for struct corgibl_machinfo */
  20
  21 #include "../generic.h"
  22
  23 #define A730_MAX_INTENSITY 0xff
  24 #define A730_DEFAULT_INTENSITY (A730_MAX_INTENSITY / 4)
  25
  26 static int cur_int;
  27
  28 static void a730_set_bl_intensity(int intensity)
  29 {
  30         printk("intensity=0x%x\n", intensity);
  31         if (intensity < 0 || intensity > 255) return;
  32         cur_int = intensity;
  33
  34         pxa_gpio_mode(GPIO_NR_A730_BACKLIGHT_EN | GPIO_OUT);
  35         SET_A730_GPIO(BACKLIGHT_EN, intensity != 0);
  36         PWM_CTRL0 = 1;
  37         //PWM_PWDUTY0 = intensity;
  38         //PWM_PERVAL0 = A730_MAX_INTENSITY;
  39
  40         if (intensity)
  41         {
  42                 pxa_set_cken(CKEN0_PWM0, 1);
  43                 PWM_PWDUTY0 = intensity;
  44                 PWM_PERVAL0 = A730_MAX_INTENSITY;
  45         }
  46         else
  47         {
  48                 PWM_PWDUTY0 = A730_MAX_INTENSITY;
  49                 PWM_PERVAL0 = 0;
  50                 pxa_set_cken(CKEN0_PWM0, 0);
  51         }
  52 }
  53
  54 static struct corgibl_machinfo a730_bl_machinfo = {
  55         .default_intensity = A730_DEFAULT_INTENSITY,
  56         .limit_mask = 0xff,
  57         .max_intensity = A730_MAX_INTENSITY,
  58         .set_bl_intensity = a730_set_bl_intensity,
  59 };
  60
  61 struct platform_device a730_bl = {
  62         .name = "corgi-bl",
  63         .dev = {
  64                 .platform_data = &a730_bl_machinfo,
  65         },
  66 };
  67
  68 MODULE_AUTHOR("Serge Nikolaenko <mypal_hh@utl.ru>");
  69 MODULE_DESCRIPTION("Backlight driver for ASUS A730(W)");
  70 MODULE_LICENSE("GPL");