Blame view
drivers/rtc/rtc-ds3234.c
4.67 KB
f60091575 rtc: rtc-ds3234 f... |
1 |
/* rtc-ds3234.c |
2f9b75e09 rtc: add device d... |
2 3 4 5 6 7 8 9 10 11 |
* * Driver for Dallas Semiconductor (DS3234) SPI RTC with Integrated Crystal * and SRAM. * * Copyright (C) 2008 MIMOMax Wireless Ltd. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * |
2f9b75e09 rtc: add device d... |
12 |
*/ |
f60091575 rtc: rtc-ds3234 f... |
13 14 |
#include <linux/init.h> #include <linux/module.h> |
2f9b75e09 rtc: add device d... |
15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 |
#include <linux/device.h> #include <linux/platform_device.h> #include <linux/rtc.h> #include <linux/spi/spi.h> #include <linux/bcd.h> #define DS3234_REG_SECONDS 0x00 #define DS3234_REG_MINUTES 0x01 #define DS3234_REG_HOURS 0x02 #define DS3234_REG_DAY 0x03 #define DS3234_REG_DATE 0x04 #define DS3234_REG_MONTH 0x05 #define DS3234_REG_YEAR 0x06 #define DS3234_REG_CENTURY (1 << 7) /* Bit 7 of the Month register */ #define DS3234_REG_CONTROL 0x0E #define DS3234_REG_CONT_STAT 0x0F |
f60091575 rtc: rtc-ds3234 f... |
32 |
static int ds3234_set_reg(struct device *dev, unsigned char address, |
2f9b75e09 rtc: add device d... |
33 34 35 36 37 38 39 40 |
unsigned char data) { struct spi_device *spi = to_spi_device(dev); unsigned char buf[2]; /* MSB must be '1' to indicate write */ buf[0] = address | 0x80; buf[1] = data; |
f60091575 rtc: rtc-ds3234 f... |
41 |
return spi_write_then_read(spi, buf, 2, NULL, 0); |
2f9b75e09 rtc: add device d... |
42 43 44 45 46 47 |
} static int ds3234_get_reg(struct device *dev, unsigned char address, unsigned char *data) { struct spi_device *spi = to_spi_device(dev); |
2f9b75e09 rtc: add device d... |
48 |
|
f60091575 rtc: rtc-ds3234 f... |
49 |
*data = address & 0x7f; |
2f9b75e09 rtc: add device d... |
50 |
|
f60091575 rtc: rtc-ds3234 f... |
51 |
return spi_write_then_read(spi, data, 1, data, 1); |
2f9b75e09 rtc: add device d... |
52 |
} |
f60091575 rtc: rtc-ds3234 f... |
53 |
static int ds3234_read_time(struct device *dev, struct rtc_time *dt) |
2f9b75e09 rtc: add device d... |
54 |
{ |
f60091575 rtc: rtc-ds3234 f... |
55 56 |
int err; unsigned char buf[8]; |
2f9b75e09 rtc: add device d... |
57 |
struct spi_device *spi = to_spi_device(dev); |
2f9b75e09 rtc: add device d... |
58 |
|
f60091575 rtc: rtc-ds3234 f... |
59 |
buf[0] = 0x00; /* Start address */ |
2f9b75e09 rtc: add device d... |
60 |
|
f60091575 rtc: rtc-ds3234 f... |
61 62 63 64 65 66 67 68 69 70 71 72 73 74 |
err = spi_write_then_read(spi, buf, 1, buf, 8); if (err != 0) return err; /* Seconds, Minutes, Hours, Day, Date, Month, Year */ dt->tm_sec = bcd2bin(buf[0]); dt->tm_min = bcd2bin(buf[1]); dt->tm_hour = bcd2bin(buf[2] & 0x3f); dt->tm_wday = bcd2bin(buf[3]) - 1; /* 0 = Sun */ dt->tm_mday = bcd2bin(buf[4]); dt->tm_mon = bcd2bin(buf[5] & 0x1f) - 1; /* 0 = Jan */ dt->tm_year = bcd2bin(buf[6] & 0xff) + 100; /* Assume 20YY */ return rtc_valid_tm(dt); |
2f9b75e09 rtc: add device d... |
75 |
} |
f60091575 rtc: rtc-ds3234 f... |
76 |
static int ds3234_set_time(struct device *dev, struct rtc_time *dt) |
2f9b75e09 rtc: add device d... |
77 |
{ |
2f9b75e09 rtc: add device d... |
78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 |
ds3234_set_reg(dev, DS3234_REG_SECONDS, bin2bcd(dt->tm_sec)); ds3234_set_reg(dev, DS3234_REG_MINUTES, bin2bcd(dt->tm_min)); ds3234_set_reg(dev, DS3234_REG_HOURS, bin2bcd(dt->tm_hour) & 0x3f); /* 0 = Sun */ ds3234_set_reg(dev, DS3234_REG_DAY, bin2bcd(dt->tm_wday + 1)); ds3234_set_reg(dev, DS3234_REG_DATE, bin2bcd(dt->tm_mday)); /* 0 = Jan */ ds3234_set_reg(dev, DS3234_REG_MONTH, bin2bcd(dt->tm_mon + 1)); /* Assume 20YY although we just want to make sure not to go negative. */ if (dt->tm_year > 100) dt->tm_year -= 100; ds3234_set_reg(dev, DS3234_REG_YEAR, bin2bcd(dt->tm_year)); return 0; } |
2f9b75e09 rtc: add device d... |
97 98 99 100 |
static const struct rtc_class_ops ds3234_rtc_ops = { .read_time = ds3234_read_time, .set_time = ds3234_set_time, }; |
bcc378e77 rtc: ds3234 doesn... |
101 |
static int __devinit ds3234_probe(struct spi_device *spi) |
2f9b75e09 rtc: add device d... |
102 103 104 |
{ struct rtc_device *rtc; unsigned char tmp; |
2f9b75e09 rtc: add device d... |
105 |
int res; |
2f9b75e09 rtc: add device d... |
106 107 108 |
spi->mode = SPI_MODE_3; spi->bits_per_word = 8; spi_setup(spi); |
2f9b75e09 rtc: add device d... |
109 |
res = ds3234_get_reg(&spi->dev, DS3234_REG_SECONDS, &tmp); |
f60091575 rtc: rtc-ds3234 f... |
110 |
if (res != 0) |
2f9b75e09 rtc: add device d... |
111 |
return res; |
2f9b75e09 rtc: add device d... |
112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 |
/* Control settings * * CONTROL_REG * BIT 7 6 5 4 3 2 1 0 * EOSC BBSQW CONV RS2 RS1 INTCN A2IE A1IE * * 0 0 0 1 1 1 0 0 * * CONTROL_STAT_REG * BIT 7 6 5 4 3 2 1 0 * OSF BB32kHz CRATE1 CRATE0 EN32kHz BSY A2F A1F * * 1 0 0 0 1 0 0 0 */ ds3234_get_reg(&spi->dev, DS3234_REG_CONTROL, &tmp); ds3234_set_reg(&spi->dev, DS3234_REG_CONTROL, tmp & 0x1c); ds3234_get_reg(&spi->dev, DS3234_REG_CONT_STAT, &tmp); ds3234_set_reg(&spi->dev, DS3234_REG_CONT_STAT, tmp & 0x88); /* Print our settings */ ds3234_get_reg(&spi->dev, DS3234_REG_CONTROL, &tmp); dev_info(&spi->dev, "Control Reg: 0x%02x ", tmp); ds3234_get_reg(&spi->dev, DS3234_REG_CONT_STAT, &tmp); dev_info(&spi->dev, "Ctrl/Stat Reg: 0x%02x ", tmp); |
f60091575 rtc: rtc-ds3234 f... |
141 142 143 144 145 146 |
rtc = rtc_device_register("ds3234", &spi->dev, &ds3234_rtc_ops, THIS_MODULE); if (IS_ERR(rtc)) return PTR_ERR(rtc); dev_set_drvdata(&spi->dev, rtc); |
2f9b75e09 rtc: add device d... |
147 148 |
return 0; } |
bcc378e77 rtc: ds3234 doesn... |
149 |
static int __devexit ds3234_remove(struct spi_device *spi) |
2f9b75e09 rtc: add device d... |
150 |
{ |
42fea15d6 spi/rtc-{ds1390,d... |
151 |
struct rtc_device *rtc = spi_get_drvdata(spi); |
2f9b75e09 rtc: add device d... |
152 |
|
f60091575 rtc: rtc-ds3234 f... |
153 |
rtc_device_unregister(rtc); |
2f9b75e09 rtc: add device d... |
154 155 156 157 158 159 |
return 0; } static struct spi_driver ds3234_driver = { .driver = { .name = "ds3234", |
2f9b75e09 rtc: add device d... |
160 161 162 163 164 165 166 167 |
.owner = THIS_MODULE, }, .probe = ds3234_probe, .remove = __devexit_p(ds3234_remove), }; static __init int ds3234_init(void) { |
2f9b75e09 rtc: add device d... |
168 169 170 171 172 173 174 175 176 177 178 179 180 |
return spi_register_driver(&ds3234_driver); } module_init(ds3234_init); static __exit void ds3234_exit(void) { spi_unregister_driver(&ds3234_driver); } module_exit(ds3234_exit); MODULE_DESCRIPTION("DS3234 SPI RTC driver"); MODULE_AUTHOR("Dennis Aberilla <denzzzhome@yahoo.com>"); MODULE_LICENSE("GPL"); |
e0626e384 spi: prefix modal... |
181 |
MODULE_ALIAS("spi:ds3234"); |