arch/arm/mach-pxa/h3900/h3900_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 the code by Jamie Hicks and others
   8  *
   9  */
  10
  11 #include <linux/types.h>
  12 #include <asm/arch/hardware.h>  /* for pxa-regs.h (__REG) */
  13 #include <linux/platform_device.h>
  14 #include <asm/arch/pxa-regs.h>  /* LCCR[0,1,2,3]* */
  15 #include <asm/mach-types.h>     /* machine_is_h3900 */
  16 #include <linux/corgi_bl.h>
  17 #include <linux/err.h>
  18
  19 #include <asm/arch/h3900-gpio.h>
  20 #include <asm/arch/h3900-asic.h>
  21 #include <asm/hardware/ipaq-asic3.h>
  22 #include <linux/soc/asic2_base.h>
  23 #include <linux/soc/asic3_base.h>
  24
  25 #define H3900_DEFAULT_INTENSITY (0x100 / 4)
  26
  27 extern struct platform_device h3900_asic3, h3900_asic2;
  28
  29 static void h3900_set_bl_intensity(int intensity)
  30 {
  31         if (intensity > 0) {
  32                 asic2_clock_enable(&h3900_asic2.dev, ASIC2_CLOCK_PWM | ASIC2_CLOCK_EX1,
  33                                          ASIC2_CLOCK_PWM | ASIC2_CLOCK_EX1);
  34                 asic2_set_pwm(&h3900_asic2.dev, _IPAQ_ASIC2_PWM_0_Base, intensity, 0x100,
  35                                     PWM_TIMEBASE_ENABLE | 0x8);
  36                 asic3_set_gpio_out_b(&h3900_asic3.dev, GPIO3_FL_PWR_ON, GPIO3_FL_PWR_ON);
  37         } else {
  38                 asic3_set_gpio_out_b (&h3900_asic3.dev, GPIO3_FL_PWR_ON, 0);
  39                 asic2_set_pwm(&h3900_asic2.dev, _IPAQ_ASIC2_PWM_0_Base, 0, 0, 0);
  40                 asic2_clock_enable(&h3900_asic2.dev, ASIC2_CLOCK_PWM, 0);
  41         }
  42 }
  43
  44
  45 static struct corgibl_machinfo h3900_bl_machinfo = {
  46         .default_intensity = H3900_DEFAULT_INTENSITY,
  47         .limit_mask = 0xffff,
  48         .max_intensity = 0x100,
  49         .set_bl_intensity = h3900_set_bl_intensity,
  50 };
  51
  52 struct platform_device h3900_bl = {
  53         .name = "corgi-bl",
  54         .dev = {
  55                 .platform_data = &h3900_bl_machinfo,
  56         },
  57 };
  58
  59 MODULE_AUTHOR("Paul Sokolovsky <pmiscml@gmail.com>");
  60 MODULE_DESCRIPTION("Backlight driver for iPAQ h3900");
  61 MODULE_LICENSE("GPL");
  62