scoutos / prex-0.9.0 / bsp / drv / dev / rtc / rtc.c @ 03e9c04a
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1 | 03e9c04a | Brad Neuman | /*
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2 | * Copyright (c) 1988 University of Utah.
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3 | * Copyright (c) 1982, 1990, 1993
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4 | * The Regents of the University of California. All rights reserved.
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5 | *
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6 | * This code is derived from software contributed to Berkeley by
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7 | * the Systems Programming Group of the University of Utah Computer
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8 | * Science Department.
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9 | *
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10 | * Redistribution and use in source and binary forms, with or without
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11 | * modification, are permitted provided that the following conditions
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12 | * are met:
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13 | * 1. Redistributions of source code must retain the above copyright
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14 | * notice, this list of conditions and the following disclaimer.
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15 | * 2. Redistributions in binary form must reproduce the above copyright
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16 | * notice, this list of conditions and the following disclaimer in the
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17 | * documentation and/or other materials provided with the distribution.
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18 | * 3. Neither the name of the University nor the names of its contributors
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19 | * may be used to endorse or promote products derived from this software
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20 | * without specific prior written permission.
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21 | *
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22 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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23 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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24 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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25 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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27 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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28 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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29 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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30 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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31 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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32 | * SUCH DAMAGE.
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33 | *
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34 | * from: Utah $Hdr: clock.c 1.18 91/01/21$
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35 | *
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36 | * @(#)clock.c 8.2 (Berkeley) 1/12/94
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37 | */
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38 | |||
39 | /* Modified for Prex by Kohsuke Ohtani */
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40 | |||
41 | /*
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42 | * rtc.c - machine independent RTC driver
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43 | */
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44 | |||
45 | #include <sys/time.h> |
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46 | #include <sys/ioctl.h> |
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47 | |||
48 | #include <driver.h> |
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49 | #include <rtc.h> |
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50 | |||
51 | #define FEBRUARY 2 |
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52 | #define days_in_year(a) (leapyear(a) ? 366 : 365) |
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53 | #define days_in_month(a) (month_days[(a) - 1]) |
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54 | |||
55 | struct rtc_softc {
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56 | device_t dev; /* device object */
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57 | struct rtc_ops *ops; /* rtc operations */ |
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58 | void *aux; /* cookie data */ |
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59 | time_t boot_sec; /* Time (sec) at system boot */
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60 | u_long boot_ticks; /* Time (ticks) at system boot */
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61 | }; |
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62 | |||
63 | static int rtc_ioctl(device_t, u_long, void *); |
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64 | static int rtc_init(struct driver *); |
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65 | |||
66 | static struct devops rtc_devops = { |
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67 | /* open */ no_open,
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68 | /* close */ no_close,
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69 | /* read */ no_read,
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70 | /* write */ no_write,
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71 | /* ioctl */ rtc_ioctl,
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72 | /* devctl */ no_devctl,
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73 | }; |
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74 | |||
75 | struct driver rtc_driver = {
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76 | /* name */ "rtc", |
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77 | /* devops */ &rtc_devops,
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78 | /* devsz */ sizeof(struct rtc_softc), |
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79 | /* flags */ 0, |
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80 | /* probe */ NULL, |
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81 | /* init */ rtc_init,
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82 | /* shutdown */ NULL, |
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83 | }; |
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84 | |||
85 | static const int month_days[12] = { |
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86 | 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 |
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87 | }; |
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88 | |||
89 | static int |
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90 | leapyear(u_int year) |
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91 | { |
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92 | int rv = 0; |
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93 | |||
94 | if ((year & 3) == 0) { |
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95 | rv = 1;
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96 | if ((year % 100) == 0) { |
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97 | rv = 0;
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98 | if ((year % 400) == 0) |
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99 | rv = 1;
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100 | } |
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101 | } |
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102 | return (rv);
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103 | } |
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104 | |||
105 | time_t |
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106 | rtc_ymdhms_to_secs(struct clock_ymdhms *dt)
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107 | { |
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108 | time_t secs; |
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109 | u_int i, year, days; |
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110 | |||
111 | year = dt->year; |
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112 | |||
113 | /*
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114 | * Compute days since start of time.
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115 | * First from years, then from months.
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116 | */
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117 | days = 0;
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118 | for (i = POSIX_BASE_YEAR; i < year; i++)
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119 | days += days_in_year(i); |
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120 | if (leapyear(year) && dt->mon > FEBRUARY)
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121 | days++; |
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122 | |||
123 | /* Months */
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124 | for (i = 1; i < dt->mon; i++) |
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125 | days += days_in_month(i); |
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126 | days += (dt->day - 1);
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127 | |||
128 | /* Add hours, minutes, seconds. */
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129 | secs = (time_t)(((days * 24 + dt->hour) * 60 + dt->min) |
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130 | * 60 + dt->sec);
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131 | |||
132 | return (secs);
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133 | } |
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134 | |||
135 | /* This function uses a copy of month_days[] */
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136 | #undef days_in_month
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137 | #define days_in_month(a) (mthdays[(a) - 1]) |
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138 | |||
139 | void
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140 | rtc_secs_to_ymdhms(time_t secs, struct clock_ymdhms *dt)
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141 | { |
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142 | u_int mthdays[12];
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143 | u_int i, days; |
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144 | u_int rsec; /* remainder seconds */
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145 | |||
146 | memcpy(mthdays, month_days, sizeof(mthdays));
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147 | |||
148 | days = secs / SECDAY; |
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149 | rsec = secs % SECDAY; |
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150 | |||
151 | /* Day of week (Note: 1/1/1970 was a Thursday) */
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152 | dt->dow = (days + 4) % 7; |
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153 | |||
154 | /* Subtract out whole years, counting them in i. */
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155 | for (i = POSIX_BASE_YEAR; days >= days_in_year(i); i++)
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156 | days -= days_in_year(i); |
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157 | dt->year = (u_short)i; |
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158 | |||
159 | /* Subtract out whole months, counting them in i. */
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160 | if (leapyear(i))
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161 | days_in_month(FEBRUARY) = 29;
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162 | for (i = 1; days >= days_in_month(i); i++) |
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163 | days -= days_in_month(i); |
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164 | dt->mon = i; |
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165 | |||
166 | /* Days are what is left over (+1) from all that. */
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167 | dt->day = days + 1;
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168 | |||
169 | /* Hours, minutes, seconds are easy */
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170 | dt->hour = rsec / 3600;
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171 | rsec = rsec % 3600;
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172 | dt->min = rsec / 60;
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173 | rsec = rsec % 60;
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174 | dt->sec = rsec; |
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175 | } |
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176 | |||
177 | static int |
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178 | rtc_ioctl(device_t dev, u_long cmd, void *arg)
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179 | { |
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180 | struct rtc_softc *sc = device_private(dev);
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181 | struct timeval tv;
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182 | int error = 0; |
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183 | u_long msec; |
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184 | |||
185 | switch (cmd) {
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186 | case RTCIOC_GET_TIME:
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187 | /*
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188 | * Calculate current time (sec/usec) from
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189 | * boot time and current tick count.
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190 | */
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191 | msec = hztoms(timer_ticks() - sc->boot_ticks); |
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192 | tv.tv_sec = sc->boot_sec + (msec / 1000);
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193 | tv.tv_usec = (long)((msec * 1000) % 1000000); |
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194 | if (copyout(&tv, arg, sizeof(tv))) |
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195 | return EFAULT;
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196 | break;
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197 | |||
198 | case RTCIOC_SET_TIME:
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199 | /*
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200 | * TODO: We need new capability to set time.
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201 | */
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202 | error = EINVAL; |
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203 | break;
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204 | default:
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205 | return EINVAL;
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206 | } |
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207 | return error;
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208 | } |
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209 | |||
210 | void
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211 | rtc_attach(struct rtc_ops *ops, void *aux) |
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212 | { |
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213 | struct rtc_softc *sc;
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214 | device_t dev; |
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215 | struct timeval tv;
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216 | |||
217 | dev = device_create(&rtc_driver, "rtc", D_CHR);
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218 | |||
219 | sc = device_private(dev); |
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220 | sc->dev = dev; |
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221 | sc->ops = ops; |
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222 | sc->aux = aux; |
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223 | |||
224 | /* Save boot time for later use. */
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225 | ops->gettime(aux, &tv); |
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226 | sc->boot_sec = tv.tv_sec; |
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227 | sc->boot_ticks = timer_ticks(); |
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228 | } |
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229 | |||
230 | static int |
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231 | rtc_init(struct driver *self)
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232 | { |
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233 | |||
234 | return 0; |
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235 | } |