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[/] [test_project/] [trunk/] [linux_sd_driver/] [drivers/] [rtc/] [rtc-m48t86.c] - Blame information for rev 62

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Line No. Rev Author Line
1 62 marcus.erl
/*
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 * ST M48T86 / Dallas DS12887 RTC driver
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 * Copyright (c) 2006 Tower Technologies
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 *
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 * Author: Alessandro Zummo <a.zummo@towertech.it>
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License version 2 as
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 * published by the Free Software Foundation.
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 *
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 * This drivers only supports the clock running in BCD and 24H mode.
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 * If it will be ever adapted to binary and 12H mode, care must be taken
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 * to not introduce bugs.
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 */
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#include <linux/module.h>
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#include <linux/rtc.h>
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#include <linux/platform_device.h>
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#include <linux/m48t86.h>
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#include <linux/bcd.h>
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#define M48T86_REG_SEC          0x00
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#define M48T86_REG_SECALRM      0x01
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#define M48T86_REG_MIN          0x02
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#define M48T86_REG_MINALRM      0x03
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#define M48T86_REG_HOUR         0x04
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#define M48T86_REG_HOURALRM     0x05
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#define M48T86_REG_DOW          0x06 /* 1 = sunday */
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#define M48T86_REG_DOM          0x07
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#define M48T86_REG_MONTH        0x08 /* 1 - 12 */
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#define M48T86_REG_YEAR         0x09 /* 0 - 99 */
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#define M48T86_REG_A            0x0A
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#define M48T86_REG_B            0x0B
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#define M48T86_REG_C            0x0C
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#define M48T86_REG_D            0x0D
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#define M48T86_REG_B_H24        (1 << 1)
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#define M48T86_REG_B_DM         (1 << 2)
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#define M48T86_REG_B_SET        (1 << 7)
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#define M48T86_REG_D_VRT        (1 << 7)
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#define DRV_VERSION "0.1"
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44
 
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static int m48t86_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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        unsigned char reg;
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        struct platform_device *pdev = to_platform_device(dev);
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        struct m48t86_ops *ops = pdev->dev.platform_data;
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        reg = ops->readbyte(M48T86_REG_B);
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        if (reg & M48T86_REG_B_DM) {
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                /* data (binary) mode */
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                tm->tm_sec      = ops->readbyte(M48T86_REG_SEC);
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                tm->tm_min      = ops->readbyte(M48T86_REG_MIN);
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                tm->tm_hour     = ops->readbyte(M48T86_REG_HOUR) & 0x3F;
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                tm->tm_mday     = ops->readbyte(M48T86_REG_DOM);
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                /* tm_mon is 0-11 */
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                tm->tm_mon      = ops->readbyte(M48T86_REG_MONTH) - 1;
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                tm->tm_year     = ops->readbyte(M48T86_REG_YEAR) + 100;
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                tm->tm_wday     = ops->readbyte(M48T86_REG_DOW);
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        } else {
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                /* bcd mode */
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                tm->tm_sec      = BCD2BIN(ops->readbyte(M48T86_REG_SEC));
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                tm->tm_min      = BCD2BIN(ops->readbyte(M48T86_REG_MIN));
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                tm->tm_hour     = BCD2BIN(ops->readbyte(M48T86_REG_HOUR) & 0x3F);
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                tm->tm_mday     = BCD2BIN(ops->readbyte(M48T86_REG_DOM));
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                /* tm_mon is 0-11 */
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                tm->tm_mon      = BCD2BIN(ops->readbyte(M48T86_REG_MONTH)) - 1;
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                tm->tm_year     = BCD2BIN(ops->readbyte(M48T86_REG_YEAR)) + 100;
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                tm->tm_wday     = BCD2BIN(ops->readbyte(M48T86_REG_DOW));
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        }
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        /* correct the hour if the clock is in 12h mode */
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        if (!(reg & M48T86_REG_B_H24))
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                if (ops->readbyte(M48T86_REG_HOUR) & 0x80)
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                        tm->tm_hour += 12;
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        return 0;
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}
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static int m48t86_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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        unsigned char reg;
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        struct platform_device *pdev = to_platform_device(dev);
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        struct m48t86_ops *ops = pdev->dev.platform_data;
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        reg = ops->readbyte(M48T86_REG_B);
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        /* update flag and 24h mode */
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        reg |= M48T86_REG_B_SET | M48T86_REG_B_H24;
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        ops->writebyte(reg, M48T86_REG_B);
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        if (reg & M48T86_REG_B_DM) {
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                /* data (binary) mode */
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                ops->writebyte(tm->tm_sec, M48T86_REG_SEC);
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                ops->writebyte(tm->tm_min, M48T86_REG_MIN);
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                ops->writebyte(tm->tm_hour, M48T86_REG_HOUR);
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                ops->writebyte(tm->tm_mday, M48T86_REG_DOM);
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                ops->writebyte(tm->tm_mon + 1, M48T86_REG_MONTH);
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                ops->writebyte(tm->tm_year % 100, M48T86_REG_YEAR);
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                ops->writebyte(tm->tm_wday, M48T86_REG_DOW);
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        } else {
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                /* bcd mode */
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                ops->writebyte(BIN2BCD(tm->tm_sec), M48T86_REG_SEC);
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                ops->writebyte(BIN2BCD(tm->tm_min), M48T86_REG_MIN);
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                ops->writebyte(BIN2BCD(tm->tm_hour), M48T86_REG_HOUR);
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                ops->writebyte(BIN2BCD(tm->tm_mday), M48T86_REG_DOM);
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                ops->writebyte(BIN2BCD(tm->tm_mon + 1), M48T86_REG_MONTH);
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                ops->writebyte(BIN2BCD(tm->tm_year % 100), M48T86_REG_YEAR);
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                ops->writebyte(BIN2BCD(tm->tm_wday), M48T86_REG_DOW);
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        }
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        /* update ended */
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        reg &= ~M48T86_REG_B_SET;
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        ops->writebyte(reg, M48T86_REG_B);
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119
        return 0;
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}
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static int m48t86_rtc_proc(struct device *dev, struct seq_file *seq)
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{
124
        unsigned char reg;
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        struct platform_device *pdev = to_platform_device(dev);
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        struct m48t86_ops *ops = pdev->dev.platform_data;
127
 
128
        reg = ops->readbyte(M48T86_REG_B);
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130
        seq_printf(seq, "mode\t\t: %s\n",
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                 (reg & M48T86_REG_B_DM) ? "binary" : "bcd");
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        reg = ops->readbyte(M48T86_REG_D);
134
 
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        seq_printf(seq, "battery\t\t: %s\n",
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                 (reg & M48T86_REG_D_VRT) ? "ok" : "exhausted");
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138
        return 0;
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}
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141
static const struct rtc_class_ops m48t86_rtc_ops = {
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        .read_time      = m48t86_rtc_read_time,
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        .set_time       = m48t86_rtc_set_time,
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        .proc           = m48t86_rtc_proc,
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};
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static int __devinit m48t86_rtc_probe(struct platform_device *dev)
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{
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        unsigned char reg;
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        struct m48t86_ops *ops = dev->dev.platform_data;
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        struct rtc_device *rtc = rtc_device_register("m48t86",
152
                                &dev->dev, &m48t86_rtc_ops, THIS_MODULE);
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154
        if (IS_ERR(rtc))
155
                return PTR_ERR(rtc);
156
 
157
        platform_set_drvdata(dev, rtc);
158
 
159
        /* read battery status */
160
        reg = ops->readbyte(M48T86_REG_D);
161
        dev_info(&dev->dev, "battery %s\n",
162
                (reg & M48T86_REG_D_VRT) ? "ok" : "exhausted");
163
 
164
        return 0;
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}
166
 
167
static int __devexit m48t86_rtc_remove(struct platform_device *dev)
168
{
169
        struct rtc_device *rtc = platform_get_drvdata(dev);
170
 
171
        if (rtc)
172
                rtc_device_unregister(rtc);
173
 
174
        platform_set_drvdata(dev, NULL);
175
 
176
        return 0;
177
}
178
 
179
static struct platform_driver m48t86_rtc_platform_driver = {
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        .driver         = {
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                .name   = "rtc-m48t86",
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                .owner  = THIS_MODULE,
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        },
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        .probe          = m48t86_rtc_probe,
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        .remove         = __devexit_p(m48t86_rtc_remove),
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};
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188
static int __init m48t86_rtc_init(void)
189
{
190
        return platform_driver_register(&m48t86_rtc_platform_driver);
191
}
192
 
193
static void __exit m48t86_rtc_exit(void)
194
{
195
        platform_driver_unregister(&m48t86_rtc_platform_driver);
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}
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198
MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
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MODULE_DESCRIPTION("M48T86 RTC driver");
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MODULE_LICENSE("GPL");
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MODULE_VERSION(DRV_VERSION);
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203
module_init(m48t86_rtc_init);
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module_exit(m48t86_rtc_exit);

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