diff options
Diffstat (limited to 'firmware/drivers/rtc')
-rw-r--r-- | firmware/drivers/rtc/rtc_s35390a.c | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/firmware/drivers/rtc/rtc_s35390a.c b/firmware/drivers/rtc/rtc_s35390a.c new file mode 100644 index 0000000000..5e0c90926c --- /dev/null +++ b/firmware/drivers/rtc/rtc_s35390a.c | |||
@@ -0,0 +1,93 @@ | |||
1 | /*************************************************************************** | ||
2 | * __________ __ ___. | ||
3 | * Open \______ \ ____ ____ | | _\_ |__ _______ ___ | ||
4 | * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / | ||
5 | * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < | ||
6 | * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ | ||
7 | * \/ \/ \/ \/ \/ | ||
8 | * $Id$ | ||
9 | * | ||
10 | * Copyright (C) 2009 by Bertrik Sikken | ||
11 | * Copyright (C) 2008 by Robert Kukla | ||
12 | * | ||
13 | * This program is free software; you can redistribute it and/or | ||
14 | * modify it under the terms of the GNU General Public License | ||
15 | * as published by the Free Software Foundation; either version 2 | ||
16 | * of the License, or (at your option) any later version. | ||
17 | * | ||
18 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY | ||
19 | * KIND, either express or implied. | ||
20 | * | ||
21 | ****************************************************************************/ | ||
22 | #include "config.h" | ||
23 | #include "rtc.h" | ||
24 | #include "i2c-s5l8700.h" | ||
25 | |||
26 | /* Driver for the Seiko S35390A real-time clock chip with i2c interface | ||
27 | |||
28 | This driver was derived from rtc_mr100.c and adapted for the S35390A | ||
29 | used in the Meizu M3 (and possibly others). | ||
30 | */ | ||
31 | |||
32 | #define RTC_ADDR 0x60 | ||
33 | |||
34 | #define STATUS_REG1 0 | ||
35 | #define STATUS_REG2 1 | ||
36 | #define REALTIME_DATA1 2 | ||
37 | #define REALTIME_DATA2 3 | ||
38 | #define INT1_REG 4 | ||
39 | #define INT2_REG 5 | ||
40 | #define CLOCK_CORR_REG 6 | ||
41 | #define FREE_REG 7 | ||
42 | |||
43 | |||
44 | static void reverse_bits(unsigned char* v, int size) | ||
45 | { | ||
46 | static const unsigned char flipnibble[] = | ||
47 | {0x00, 0x08, 0x04, 0x0C, 0x02, 0x0A, 0x06, 0x0E, | ||
48 | 0x01, 0x09, 0x05, 0x0D, 0x03, 0x0B, 0x07, 0x0F}; | ||
49 | int i; | ||
50 | |||
51 | for (i = 0; i < size; i++) { | ||
52 | v[i] = (flipnibble[v[i] & 0x0F] << 4) | | ||
53 | flipnibble[(v[i] >> 4) & 0x0F]; | ||
54 | } | ||
55 | } | ||
56 | |||
57 | void rtc_init(void) | ||
58 | { | ||
59 | i2c_init(); | ||
60 | } | ||
61 | |||
62 | int rtc_read_datetime(unsigned char* buf) | ||
63 | { | ||
64 | unsigned char data[7]; | ||
65 | int i, ret; | ||
66 | |||
67 | ret = i2c_read(RTC_ADDR | (REALTIME_DATA1 << 1), -1, sizeof(data), data); | ||
68 | reverse_bits(data, sizeof(data)); | ||
69 | |||
70 | buf[4] &= 0x3f; /* mask out p.m. flag */ | ||
71 | |||
72 | for (i = 0; i < 7; i++) { | ||
73 | buf[i] = data[6 - i]; | ||
74 | } | ||
75 | |||
76 | return ret; | ||
77 | } | ||
78 | |||
79 | int rtc_write_datetime(unsigned char* buf) | ||
80 | { | ||
81 | unsigned char data[7]; | ||
82 | int i, ret; | ||
83 | |||
84 | for (i = 0; i < 7; i++) { | ||
85 | data[i] = buf[6 - i]; | ||
86 | } | ||
87 | |||
88 | reverse_bits(data, sizeof(data)); | ||
89 | ret = i2c_write(RTC_ADDR | (REALTIME_DATA1 << 1), -1, sizeof(data), data); | ||
90 | |||
91 | return ret; | ||
92 | } | ||
93 | |||