arch/arm/mach-pxa/htcuniversal/htcuniversal_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  * Based on code from older versions of htcuniversal_lcd.c
   8  *
   9  */
  10
  11 #include <linux/types.h>
  12 #include <linux/platform_device.h>
  13 #include <asm/arch/hardware.h>  /* for pxa-regs.h (__REG) */
  14 #include <asm/arch/pxa-regs.h>
  15 #include <asm/mach-types.h>     /* machine_is_htcuniversal */
  16 #include <linux/corgi_bl.h>
  17 #include <linux/err.h>
  18
  19 #include <asm/arch/htcuniversal-gpio.h>
  20 #include <asm/arch/htcuniversal-asic.h>
  21 #include <asm/hardware/ipaq-asic3.h>
  22 #include <linux/soc/asic3_base.h>
  23
  24 #define HTCUNIVERSAL_MAX_INTENSITY 0xc7
  25
  26 static void htcuniversal_set_bl_intensity(int intensity)
  27 {
  28         PWM_CTRL1 = 1;            /* pre-scaler */
  29         PWM_PWDUTY1 = intensity; /* duty cycle */
  30         PWM_PERVAL1 = HTCUNIVERSAL_MAX_INTENSITY+1;      /* period */
  31
  32         if (intensity > 0) {
  33                 pxa_set_cken(CKEN1_PWM1, 1);
  34                 asic3_set_gpio_out_d(&htcuniversal_asic3.dev,
  35                         (1<<GPIOD_FL_PWR_ON), (1<<GPIOD_FL_PWR_ON));
  36         } else {
  37                 pxa_set_cken(CKEN1_PWM1, 0);
  38                 asic3_set_gpio_out_d(&htcuniversal_asic3.dev,
  39                         (1<<GPIOD_FL_PWR_ON), 0);
  40         }
  41 }
  42
  43
  44 static struct corgibl_machinfo htcuniversal_bl_machinfo = {
  45         .default_intensity = HTCUNIVERSAL_MAX_INTENSITY / 4,
  46         .limit_mask = 0xff,
  47         .max_intensity = HTCUNIVERSAL_MAX_INTENSITY,
  48         .set_bl_intensity = htcuniversal_set_bl_intensity,
  49 };
  50
  51 struct platform_device htcuniversal_bl = {
  52         .name = "corgi-bl",
  53         .dev = {
  54                 .platform_data = &htcuniversal_bl_machinfo,
  55         },
  56 };
  57
  58 MODULE_AUTHOR("Paul Sokolovsky <pmiscml@gmail.com>");
  59 MODULE_DESCRIPTION("Backlight driver for HTC Universal");
  60 MODULE_LICENSE("GPL");