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Diffstat (limited to 'firmware/target/arm/imx233/creative-zenxfi3/backlight-zenxfi3.c')
-rw-r--r--firmware/target/arm/imx233/creative-zenxfi3/backlight-zenxfi3.c85
1 files changed, 85 insertions, 0 deletions
diff --git a/firmware/target/arm/imx233/creative-zenxfi3/backlight-zenxfi3.c b/firmware/target/arm/imx233/creative-zenxfi3/backlight-zenxfi3.c
new file mode 100644
index 0000000000..59c3c133aa
--- /dev/null
+++ b/firmware/target/arm/imx233/creative-zenxfi3/backlight-zenxfi3.c
@@ -0,0 +1,85 @@
1/***************************************************************************
2 * __________ __ ___.
3 * Open \______ \ ____ ____ | | _\_ |__ _______ ___
4 * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
5 * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
6 * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
7 * \/ \/ \/ \/ \/
8 * $Id$
9 *
10 * Copyright (C) 2012 by Amaury Pouly
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version 2
15 * of the License, or (at your option) any later version.
16 *
17 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
18 * KIND, either express or implied.
19 *
20 ****************************************************************************/
21
22#include "config.h"
23#include "system.h"
24#include "lcd.h"
25#include "backlight.h"
26#include "backlight-target.h"
27#include "pwm-imx233.h"
28#include "mpr121.h"
29
30void _backlight_set_brightness(int brightness)
31{
32 imx233_pwm_setup_channel(2, 1024, HW_PWM_PERIODx__CDIV__DIV_1,
33 0, HW_PWM_PERIODx__STATE__HIGH,
34 (brightness * 1024) / 100, HW_PWM_PERIODx__STATE__LOW);
35 imx233_pwm_enable_channel(2, true);
36}
37
38bool _backlight_init(void)
39{
40 _backlight_set_brightness(DEFAULT_BRIGHTNESS_SETTING);
41 return true;
42}
43
44void _backlight_on(void)
45{
46#ifdef HAVE_LCD_ENABLE
47 lcd_enable(true); /* power on lcd + visible display */
48#endif
49 /* don't do anything special, the core will set the brightness */
50}
51
52void _backlight_off(void)
53{
54 /* there is no real on/off but we can set to 0 brightness */
55 _backlight_set_brightness(0);
56#ifdef HAVE_LCD_ENABLE
57 lcd_enable(false); /* power off visible display */
58#endif
59}
60
61/* ELE8 is the button light GPIO */
62void _buttonlight_on(void)
63{
64 /* assume mpr121 was initialized by button-zenxfi3.c */
65 mpr121_set_gpio_output(8, ELE_GPIO_SET);
66}
67
68void _buttonlight_off(void)
69{
70 /* assume mpr121 was initialized by button-zenxfi3.c */
71 mpr121_set_gpio_output(8, ELE_GPIO_CLR);
72}
73
74void _buttonlight_set_brightness(int brightness)
75{
76 /* assume mpr121 was initialized by button-zenxfi3.c */
77 /* since backlight brightness is the same for the screen and the button light,
78 * map [MIN_BRIGHTNESS_SETTING,MAX_BRIGHTNESS_SETTING] to
79 * [ELE_PWM_MIN_DUTY,ELE_PWM_MAX_DUTY] */
80 brightness = ELE_PWM_MIN_DUTY + (brightness - MIN_BRIGHTNESS_SETTING) *
81 (ELE_PWM_MAX_DUTY - ELE_PWM_MIN_DUTY + 1) /
82 (MAX_BRIGHTNESS_SETTING - MIN_BRIGHTNESS_SETTING + 1);
83 brightness = MIN(brightness, ELE_PWM_MAX_DUTY);
84 mpr121_set_gpio_pwm(8, brightness);
85}