arch/arm/mach-pxa/htcapache/htcapache-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 Paul Sokolosvky
   7  *
   8  */
   9
  10 #include <linux/types.h>
  11 #include <linux/platform_device.h>
  12 #include <asm/arch/hardware.h>  /* for pxa-regs.h (__REG) */
  13 #include <asm/arch/pxa-regs.h>
  14 #include <linux/corgi_bl.h>
  15 #include <linux/err.h>
  16
  17 #include <asm/arch/htcapache-gpio.h>
  18
  19 #define MAX_INTENSITY 0xc7
  20
  21 static void set_bl_intensity(int intensity)
  22 {
  23         PWM_CTRL0 = 1;            /* pre-scaler */
  24         PWM_PWDUTY0 = intensity; /* duty cycle */
  25         PWM_PERVAL0 = MAX_INTENSITY+1;      /* period */
  26
  27         if (intensity > 0) {
  28                 pxa_set_cken(CKEN0_PWM0, 1);
  29         } else {
  30                 pxa_set_cken(CKEN0_PWM0, 0);
  31         }
  32 }
  33
  34 static struct corgibl_machinfo bl_machinfo = {
  35         .default_intensity = MAX_INTENSITY / 4,
  36         .limit_mask = 0xff,
  37         .max_intensity = MAX_INTENSITY,
  38         .set_bl_intensity = set_bl_intensity,
  39 };
  40
  41 struct platform_device htcapache_bl = {
  42         .name = "corgi-bl",
  43         .dev = {
  44                 .platform_data = &bl_machinfo,
  45         },
  46 };
  47
  48 MODULE_AUTHOR("Kevin O'Connor <kevin@koconnor.net>");
  49 MODULE_DESCRIPTION("Backlight driver for HTC Apache");
  50 MODULE_LICENSE("GPL");