diff options
Diffstat (limited to 'firmware/target/arm/imx233/samsung-ypz5/backlight-ypz5.c')
-rw-r--r-- | firmware/target/arm/imx233/samsung-ypz5/backlight-ypz5.c | 149 |
1 files changed, 0 insertions, 149 deletions
diff --git a/firmware/target/arm/imx233/samsung-ypz5/backlight-ypz5.c b/firmware/target/arm/imx233/samsung-ypz5/backlight-ypz5.c deleted file mode 100644 index b02c3a1d16..0000000000 --- a/firmware/target/arm/imx233/samsung-ypz5/backlight-ypz5.c +++ /dev/null | |||
@@ -1,149 +0,0 @@ | |||
1 | /*************************************************************************** | ||
2 | * __________ __ ___. | ||
3 | * Open \______ \ ____ ____ | | _\_ |__ _______ ___ | ||
4 | * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / | ||
5 | * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < | ||
6 | * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ | ||
7 | * \/ \/ \/ \/ \/ | ||
8 | * | ||
9 | * Copyright (C) 2013 by Lorenzo Miori | ||
10 | * | ||
11 | * This program is free software; you can redistribute it and/or | ||
12 | * modify it under the terms of the GNU General Public License | ||
13 | * as published by the Free Software Foundation; either version 2 | ||
14 | * of the License, or (at your option) any later version. | ||
15 | * | ||
16 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY | ||
17 | * KIND, either express or implied. | ||
18 | * | ||
19 | ****************************************************************************/ | ||
20 | |||
21 | #include "config.h" | ||
22 | #include "system.h" | ||
23 | #include "lcd.h" | ||
24 | #include "backlight.h" | ||
25 | #include "backlight-target.h" | ||
26 | #include "pinctrl-imx233.h" | ||
27 | |||
28 | /** | ||
29 | * AAT3151 Backlight Controller | ||
30 | */ | ||
31 | |||
32 | /* Timings */ | ||
33 | #define TIME_OFF 500 | ||
34 | #define TIME_LOW 50 | ||
35 | #define TIME_HI 50 | ||
36 | #define TIME_LAT 500 | ||
37 | |||
38 | /* Number of raising edges to select the particular register */ | ||
39 | #define D1_D4_CURRENT_E 17 | ||
40 | #define D1_D3_CURRENT_E 18 | ||
41 | #define D4_CURRENT_E 19 | ||
42 | #define MAX_CURRENT_E 20 | ||
43 | #define LOW_CURRENT_E 21 | ||
44 | |||
45 | /* The actual register address / number */ | ||
46 | #define D1_D4_CURRENT 1 | ||
47 | #define D1_D3_CURRENT 2 | ||
48 | #define D4_CURRENT 3 | ||
49 | #define MAX_CURRENT 4 | ||
50 | #define LOW_CURRENT 5 | ||
51 | |||
52 | /* Valid values for LOW_CURRENT register */ | ||
53 | #define MAX_CURRENT_20 1 | ||
54 | #define MAX_CURRENT_30 2 | ||
55 | #define MAX_CURRENT_15 3 | ||
56 | #define MAX_CURRENT_LOW_CURRENT 4 | ||
57 | |||
58 | static int current_level = -1; | ||
59 | |||
60 | static void create_raising_edges(int num) | ||
61 | { | ||
62 | while (num--) | ||
63 | { | ||
64 | /* Setting a register takes a sufficient small amount of time, | ||
65 | * in the order of 50 ns. Thus the necessary 2 delays TIME_LOW/TIME_HI | ||
66 | * are not strictly necessary */ | ||
67 | imx233_pinctrl_set_gpio(3, 13, false); | ||
68 | imx233_pinctrl_set_gpio(3, 13, true); | ||
69 | } | ||
70 | } | ||
71 | |||
72 | static void aat3151_write(int addr, int data) | ||
73 | { | ||
74 | create_raising_edges(16 + addr); | ||
75 | udelay(TIME_LAT); | ||
76 | create_raising_edges(data); | ||
77 | udelay(TIME_LAT); | ||
78 | } | ||
79 | |||
80 | void backlight_hw_brightness(int level) | ||
81 | { | ||
82 | /* Don't try to reset backlight if not necessary | ||
83 | * Moreover this helps to avoid flickering when | ||
84 | * being in some screens like USB mode and | ||
85 | * pressing some keys / touchpad... | ||
86 | */ | ||
87 | if (current_level == level) return; | ||
88 | |||
89 | /* Check for limits and adjust in case */ | ||
90 | level = MIN(MAX_BRIGHTNESS_SETTING, MAX(0, level)); | ||
91 | |||
92 | if (level == 0) | ||
93 | { | ||
94 | /* Set pin low for a sufficient time, puts the device into low-power consumption state | ||
95 | * In other words backlight goes off | ||
96 | */ | ||
97 | imx233_pinctrl_set_gpio(3, 13, false); | ||
98 | udelay(TIME_OFF); | ||
99 | } | ||
100 | else | ||
101 | { | ||
102 | if (level > 3) { | ||
103 | /* This enables 16 levels of backlight */ | ||
104 | aat3151_write(MAX_CURRENT, MAX_CURRENT_15); | ||
105 | /* Set the value according Table 1 in datasheet | ||
106 | * For MAX_CURRENT_15, the scale is from 0 mA to 15 mA in 16 steps | ||
107 | */ | ||
108 | aat3151_write(D1_D3_CURRENT, 19 - level); | ||
109 | } | ||
110 | else { | ||
111 | /* This enables other 4 levels of backlight */ | ||
112 | aat3151_write(MAX_CURRENT, MAX_CURRENT_LOW_CURRENT); | ||
113 | /* Set the value according Table 1 in datasheet | ||
114 | * For LOW_CURRENT, there is no "real" scale. We have scattered values. | ||
115 | * We are interested in the last 3 -> 0.5 mA; 1 mA; 2 mA | ||
116 | */ | ||
117 | aat3151_write(LOW_CURRENT, 13 + level); | ||
118 | } | ||
119 | } | ||
120 | current_level = level; | ||
121 | } | ||
122 | |||
123 | bool backlight_hw_init(void) | ||
124 | { | ||
125 | imx233_pinctrl_acquire(3, 13, "backlight"); | ||
126 | imx233_pinctrl_set_function(3, 13, PINCTRL_FUNCTION_GPIO); | ||
127 | imx233_pinctrl_set_drive(3, 13, PINCTRL_DRIVE_4mA); | ||
128 | imx233_pinctrl_enable_gpio(3, 13, true); | ||
129 | imx233_pinctrl_set_gpio(3, 13, false); | ||
130 | return true; | ||
131 | } | ||
132 | |||
133 | void backlight_hw_on(void) | ||
134 | { | ||
135 | #ifdef HAVE_LCD_ENABLE | ||
136 | lcd_enable(true); /* power on lcd + visible display */ | ||
137 | #endif | ||
138 | /* restore the previous backlight level */ | ||
139 | backlight_hw_brightness(backlight_brightness); | ||
140 | } | ||
141 | |||
142 | void backlight_hw_off(void) | ||
143 | { | ||
144 | /* there is no real on/off but we can set to 0 brightness */ | ||
145 | backlight_hw_brightness(0); | ||
146 | #ifdef HAVE_LCD_ENABLE | ||
147 | lcd_enable(false); /* power off visible display */ | ||
148 | #endif | ||
149 | } | ||