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drivers/rtc/rtc-ds1307.c
19.3 KB
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/* * rtc-ds1307.c - RTC driver for some mostly-compatible I2C chips. * * Copyright (C) 2005 James Chapman (ds1337 core) * Copyright (C) 2006 David Brownell * * 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. */ #include <linux/module.h> #include <linux/init.h> #include <linux/slab.h> #include <linux/i2c.h> #include <linux/string.h> #include <linux/rtc.h> #include <linux/bcd.h> /* We can't determine type by probing, but if we expect pre-Linux code * to have set the chip up as a clock (turning on the oscillator and * setting the date and time), Linux can ignore the non-clock features. * That's a natural job for a factory or repair bench. |
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*/ enum ds_type { |
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ds_1307, ds_1337, ds_1338, ds_1339, ds_1340, m41t00, |
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// rs5c372 too? different address... }; |
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/* RTC registers don't differ much, except for the century flag */ #define DS1307_REG_SECS 0x00 /* 00-59 */ # define DS1307_BIT_CH 0x80 |
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# define DS1340_BIT_nEOSC 0x80 |
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#define DS1307_REG_MIN 0x01 /* 00-59 */ #define DS1307_REG_HOUR 0x02 /* 00-23, or 1-12{am,pm} */ |
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# define DS1307_BIT_12HR 0x40 /* in REG_HOUR */ # define DS1307_BIT_PM 0x20 /* in REG_HOUR */ |
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# define DS1340_BIT_CENTURY_EN 0x80 /* in REG_HOUR */ # define DS1340_BIT_CENTURY 0x40 /* in REG_HOUR */ #define DS1307_REG_WDAY 0x03 /* 01-07 */ #define DS1307_REG_MDAY 0x04 /* 01-31 */ #define DS1307_REG_MONTH 0x05 /* 01-12 */ # define DS1337_BIT_CENTURY 0x80 /* in REG_MONTH */ #define DS1307_REG_YEAR 0x06 /* 00-99 */ /* Other registers (control, status, alarms, trickle charge, NVRAM, etc) |
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* start at 7, and they differ a LOT. Only control and status matter for * basic RTC date and time functionality; be careful using them. |
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*/ |
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#define DS1307_REG_CONTROL 0x07 /* or ds1338 */ |
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# define DS1307_BIT_OUT 0x80 |
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# define DS1338_BIT_OSF 0x20 |
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# define DS1307_BIT_SQWE 0x10 # define DS1307_BIT_RS1 0x02 # define DS1307_BIT_RS0 0x01 #define DS1337_REG_CONTROL 0x0e # define DS1337_BIT_nEOSC 0x80 |
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# define DS1339_BIT_BBSQI 0x20 |
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# define DS1337_BIT_RS2 0x10 # define DS1337_BIT_RS1 0x08 # define DS1337_BIT_INTCN 0x04 # define DS1337_BIT_A2IE 0x02 # define DS1337_BIT_A1IE 0x01 |
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#define DS1340_REG_CONTROL 0x07 # define DS1340_BIT_OUT 0x80 # define DS1340_BIT_FT 0x40 # define DS1340_BIT_CALIB_SIGN 0x20 # define DS1340_M_CALIBRATION 0x1f |
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#define DS1340_REG_FLAG 0x09 # define DS1340_BIT_OSF 0x80 |
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#define DS1337_REG_STATUS 0x0f # define DS1337_BIT_OSF 0x80 # define DS1337_BIT_A2I 0x02 # define DS1337_BIT_A1I 0x01 |
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#define DS1339_REG_ALARM1_SECS 0x07 |
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#define DS1339_REG_TRICKLE 0x10 struct ds1307 { |
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u8 regs[11]; |
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enum ds_type type; |
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unsigned long flags; #define HAS_NVRAM 0 /* bit 0 == sysfs file active */ #define HAS_ALARM 1 /* bit 1 == irq claimed */ |
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struct i2c_client *client; |
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struct rtc_device *rtc; |
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struct work_struct work; |
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}; |
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struct chip_desc { |
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unsigned nvram56:1; unsigned alarm:1; |
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}; |
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static const struct chip_desc chips[] = { [ds_1307] = { |
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.nvram56 = 1, |
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}, [ds_1337] = { |
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.alarm = 1, |
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}, [ds_1338] = { |
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.nvram56 = 1, |
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}, [ds_1339] = { |
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.alarm = 1, |
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}, [ds_1340] = { }, [m41t00] = { |
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}, }; |
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static const struct i2c_device_id ds1307_id[] = { { "ds1307", ds_1307 }, { "ds1337", ds_1337 }, { "ds1338", ds_1338 }, { "ds1339", ds_1339 }, { "ds1340", ds_1340 }, { "m41t00", m41t00 }, { } }; MODULE_DEVICE_TABLE(i2c, ds1307_id); |
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/*----------------------------------------------------------------------*/ /* * The IRQ logic includes a "real" handler running in IRQ context just * long enough to schedule this workqueue entry. We need a task context * to talk to the RTC, since I2C I/O calls require that; and disable the * IRQ until we clear its status on the chip, so that this handler can * work with any type of triggering (not just falling edge). * * The ds1337 and ds1339 both have two alarms, but we only use the first * one (with a "seconds" field). For ds1337 we expect nINTA is our alarm * signal; ds1339 chips have only one alarm signal. */ static void ds1307_work(struct work_struct *work) { struct ds1307 *ds1307; struct i2c_client *client; struct mutex *lock; int stat, control; ds1307 = container_of(work, struct ds1307, work); client = ds1307->client; lock = &ds1307->rtc->ops_lock; mutex_lock(lock); stat = i2c_smbus_read_byte_data(client, DS1337_REG_STATUS); if (stat < 0) goto out; if (stat & DS1337_BIT_A1I) { stat &= ~DS1337_BIT_A1I; i2c_smbus_write_byte_data(client, DS1337_REG_STATUS, stat); control = i2c_smbus_read_byte_data(client, DS1337_REG_CONTROL); if (control < 0) goto out; control &= ~DS1337_BIT_A1IE; i2c_smbus_write_byte_data(client, DS1337_REG_CONTROL, control); /* rtc_update_irq() assumes that it is called * from IRQ-disabled context. */ local_irq_disable(); rtc_update_irq(ds1307->rtc, 1, RTC_AF | RTC_IRQF); local_irq_enable(); } out: if (test_bit(HAS_ALARM, &ds1307->flags)) enable_irq(client->irq); mutex_unlock(lock); } static irqreturn_t ds1307_irq(int irq, void *dev_id) { struct i2c_client *client = dev_id; struct ds1307 *ds1307 = i2c_get_clientdata(client); disable_irq_nosync(irq); schedule_work(&ds1307->work); return IRQ_HANDLED; } /*----------------------------------------------------------------------*/ |
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static int ds1307_get_time(struct device *dev, struct rtc_time *t) { struct ds1307 *ds1307 = dev_get_drvdata(dev); int tmp; |
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/* read the RTC date and time registers all at once */ |
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tmp = i2c_smbus_read_i2c_block_data(ds1307->client, DS1307_REG_SECS, 7, ds1307->regs); if (tmp != 7) { |
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dev_err(dev, "%s error %d ", "read", tmp); return -EIO; } dev_dbg(dev, "%s: %02x %02x %02x %02x %02x %02x %02x ", "read", ds1307->regs[0], ds1307->regs[1], ds1307->regs[2], ds1307->regs[3], ds1307->regs[4], ds1307->regs[5], ds1307->regs[6]); |
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t->tm_sec = bcd2bin(ds1307->regs[DS1307_REG_SECS] & 0x7f); t->tm_min = bcd2bin(ds1307->regs[DS1307_REG_MIN] & 0x7f); |
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tmp = ds1307->regs[DS1307_REG_HOUR] & 0x3f; |
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t->tm_hour = bcd2bin(tmp); t->tm_wday = bcd2bin(ds1307->regs[DS1307_REG_WDAY] & 0x07) - 1; t->tm_mday = bcd2bin(ds1307->regs[DS1307_REG_MDAY] & 0x3f); |
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tmp = ds1307->regs[DS1307_REG_MONTH] & 0x1f; |
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t->tm_mon = bcd2bin(tmp) - 1; |
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/* assume 20YY not 19YY, and ignore DS1337_BIT_CENTURY */ |
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t->tm_year = bcd2bin(ds1307->regs[DS1307_REG_YEAR]) + 100; |
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dev_dbg(dev, "%s secs=%d, mins=%d, " "hours=%d, mday=%d, mon=%d, year=%d, wday=%d ", "read", t->tm_sec, t->tm_min, t->tm_hour, t->tm_mday, t->tm_mon, t->tm_year, t->tm_wday); |
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/* initial clock setting can be undefined */ return rtc_valid_tm(t); |
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} static int ds1307_set_time(struct device *dev, struct rtc_time *t) { struct ds1307 *ds1307 = dev_get_drvdata(dev); int result; int tmp; u8 *buf = ds1307->regs; dev_dbg(dev, "%s secs=%d, mins=%d, " "hours=%d, mday=%d, mon=%d, year=%d, wday=%d ", |
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"write", t->tm_sec, t->tm_min, t->tm_hour, t->tm_mday, t->tm_mon, t->tm_year, t->tm_wday); |
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buf[DS1307_REG_SECS] = bin2bcd(t->tm_sec); buf[DS1307_REG_MIN] = bin2bcd(t->tm_min); buf[DS1307_REG_HOUR] = bin2bcd(t->tm_hour); buf[DS1307_REG_WDAY] = bin2bcd(t->tm_wday + 1); buf[DS1307_REG_MDAY] = bin2bcd(t->tm_mday); buf[DS1307_REG_MONTH] = bin2bcd(t->tm_mon + 1); |
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/* assume 20YY not 19YY */ tmp = t->tm_year - 100; |
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buf[DS1307_REG_YEAR] = bin2bcd(tmp); |
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switch (ds1307->type) { case ds_1337: case ds_1339: |
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buf[DS1307_REG_MONTH] |= DS1337_BIT_CENTURY; |
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break; case ds_1340: |
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buf[DS1307_REG_HOUR] |= DS1340_BIT_CENTURY_EN | DS1340_BIT_CENTURY; |
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break; default: break; } |
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dev_dbg(dev, "%s: %02x %02x %02x %02x %02x %02x %02x ", "write", buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]); |
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result = i2c_smbus_write_i2c_block_data(ds1307->client, 0, 7, buf); if (result < 0) { dev_err(dev, "%s error %d ", "write", result); return result; |
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} return 0; } |
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static int ds1337_read_alarm(struct device *dev, struct rtc_wkalrm *t) |
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{ struct i2c_client *client = to_i2c_client(dev); struct ds1307 *ds1307 = i2c_get_clientdata(client); int ret; if (!test_bit(HAS_ALARM, &ds1307->flags)) return -EINVAL; /* read all ALARM1, ALARM2, and status registers at once */ |
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ret = i2c_smbus_read_i2c_block_data(client, DS1339_REG_ALARM1_SECS, 9, ds1307->regs); if (ret != 9) { |
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dev_err(dev, "%s error %d ", "alarm read", ret); return -EIO; } dev_dbg(dev, "%s: %02x %02x %02x %02x, %02x %02x %02x, %02x %02x ", "alarm read", ds1307->regs[0], ds1307->regs[1], ds1307->regs[2], ds1307->regs[3], ds1307->regs[4], ds1307->regs[5], ds1307->regs[6], ds1307->regs[7], ds1307->regs[8]); /* report alarm time (ALARM1); assume 24 hour and day-of-month modes, * and that all four fields are checked matches */ t->time.tm_sec = bcd2bin(ds1307->regs[0] & 0x7f); t->time.tm_min = bcd2bin(ds1307->regs[1] & 0x7f); t->time.tm_hour = bcd2bin(ds1307->regs[2] & 0x3f); t->time.tm_mday = bcd2bin(ds1307->regs[3] & 0x3f); t->time.tm_mon = -1; t->time.tm_year = -1; t->time.tm_wday = -1; t->time.tm_yday = -1; t->time.tm_isdst = -1; /* ... and status */ t->enabled = !!(ds1307->regs[7] & DS1337_BIT_A1IE); t->pending = !!(ds1307->regs[8] & DS1337_BIT_A1I); dev_dbg(dev, "%s secs=%d, mins=%d, " "hours=%d, mday=%d, enabled=%d, pending=%d ", "alarm read", t->time.tm_sec, t->time.tm_min, t->time.tm_hour, t->time.tm_mday, t->enabled, t->pending); return 0; } |
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static int ds1337_set_alarm(struct device *dev, struct rtc_wkalrm *t) |
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{ struct i2c_client *client = to_i2c_client(dev); struct ds1307 *ds1307 = i2c_get_clientdata(client); unsigned char *buf = ds1307->regs; u8 control, status; int ret; if (!test_bit(HAS_ALARM, &ds1307->flags)) return -EINVAL; dev_dbg(dev, "%s secs=%d, mins=%d, " "hours=%d, mday=%d, enabled=%d, pending=%d ", "alarm set", t->time.tm_sec, t->time.tm_min, t->time.tm_hour, t->time.tm_mday, t->enabled, t->pending); /* read current status of both alarms and the chip */ |
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ret = i2c_smbus_read_i2c_block_data(client, DS1339_REG_ALARM1_SECS, 9, buf); if (ret != 9) { |
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dev_err(dev, "%s error %d ", "alarm write", ret); return -EIO; } control = ds1307->regs[7]; status = ds1307->regs[8]; dev_dbg(dev, "%s: %02x %02x %02x %02x, %02x %02x %02x, %02x %02x ", "alarm set (old status)", ds1307->regs[0], ds1307->regs[1], ds1307->regs[2], ds1307->regs[3], ds1307->regs[4], ds1307->regs[5], ds1307->regs[6], control, status); /* set ALARM1, using 24 hour and day-of-month modes */ |
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buf[0] = bin2bcd(t->time.tm_sec); buf[1] = bin2bcd(t->time.tm_min); buf[2] = bin2bcd(t->time.tm_hour); buf[3] = bin2bcd(t->time.tm_mday); /* set ALARM2 to non-garbage */ buf[4] = 0; buf[5] = 0; buf[6] = 0; /* optionally enable ALARM1 */ buf[7] = control & ~(DS1337_BIT_A1IE | DS1337_BIT_A2IE); if (t->enabled) { dev_dbg(dev, "alarm IRQ armed "); buf[7] |= DS1337_BIT_A1IE; /* only ALARM1 is used */ } buf[8] = status & ~(DS1337_BIT_A1I | DS1337_BIT_A2I); |
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ret = i2c_smbus_write_i2c_block_data(client, DS1339_REG_ALARM1_SECS, 9, buf); if (ret < 0) { |
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dev_err(dev, "can't set alarm time "); |
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return ret; |
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} return 0; } static int ds1307_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) { struct i2c_client *client = to_i2c_client(dev); struct ds1307 *ds1307 = i2c_get_clientdata(client); int ret; switch (cmd) { case RTC_AIE_OFF: if (!test_bit(HAS_ALARM, &ds1307->flags)) return -ENOTTY; ret = i2c_smbus_read_byte_data(client, DS1337_REG_CONTROL); if (ret < 0) return ret; ret &= ~DS1337_BIT_A1IE; ret = i2c_smbus_write_byte_data(client, DS1337_REG_CONTROL, ret); if (ret < 0) return ret; break; case RTC_AIE_ON: if (!test_bit(HAS_ALARM, &ds1307->flags)) return -ENOTTY; ret = i2c_smbus_read_byte_data(client, DS1337_REG_CONTROL); if (ret < 0) return ret; ret |= DS1337_BIT_A1IE; ret = i2c_smbus_write_byte_data(client, DS1337_REG_CONTROL, ret); if (ret < 0) return ret; break; default: return -ENOIOCTLCMD; } return 0; } |
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static const struct rtc_class_ops ds13xx_rtc_ops = { |
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.read_time = ds1307_get_time, .set_time = ds1307_set_time, |
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.read_alarm = ds1337_read_alarm, .set_alarm = ds1337_set_alarm, |
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.ioctl = ds1307_ioctl, |
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}; |
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/*----------------------------------------------------------------------*/ #define NVRAM_SIZE 56 static ssize_t ds1307_nvram_read(struct kobject *kobj, struct bin_attribute *attr, char *buf, loff_t off, size_t count) { struct i2c_client *client; struct ds1307 *ds1307; |
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int result; |
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client = kobj_to_i2c_client(kobj); |
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ds1307 = i2c_get_clientdata(client); if (unlikely(off >= NVRAM_SIZE)) return 0; if ((off + count) > NVRAM_SIZE) count = NVRAM_SIZE - off; if (unlikely(!count)) return count; |
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result = i2c_smbus_read_i2c_block_data(client, 8 + off, count, buf); if (result < 0) |
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dev_err(&client->dev, "%s error %d ", "nvram read", result); |
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return result; |
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} static ssize_t ds1307_nvram_write(struct kobject *kobj, struct bin_attribute *attr, char *buf, loff_t off, size_t count) { struct i2c_client *client; |
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int result; |
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client = kobj_to_i2c_client(kobj); |
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if (unlikely(off >= NVRAM_SIZE)) return -EFBIG; if ((off + count) > NVRAM_SIZE) count = NVRAM_SIZE - off; if (unlikely(!count)) return count; |
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result = i2c_smbus_write_i2c_block_data(client, 8 + off, count, buf); if (result < 0) { dev_err(&client->dev, "%s error %d ", "nvram write", result); return result; } return count; |
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} static struct bin_attribute nvram = { .attr = { .name = "nvram", .mode = S_IRUGO | S_IWUSR, |
682d73f68 rtc-ds1307 export... |
515 516 517 518 519 520 521 522 |
}, .read = ds1307_nvram_read, .write = ds1307_nvram_write, .size = NVRAM_SIZE, }; /*----------------------------------------------------------------------*/ |
1abb0dc92 [PATCH] "RTC-fram... |
523 |
static struct i2c_driver ds1307_driver; |
d2653e927 i2c: Add support ... |
524 525 |
static int __devinit ds1307_probe(struct i2c_client *client, const struct i2c_device_id *id) |
1abb0dc92 [PATCH] "RTC-fram... |
526 527 528 |
{ struct ds1307 *ds1307; int err = -ENODEV; |
1abb0dc92 [PATCH] "RTC-fram... |
529 |
int tmp; |
3760f7367 i2c: Convert most... |
530 |
const struct chip_desc *chip = &chips[id->driver_data]; |
c065f35c1 rtc-ds1307 become... |
531 |
struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); |
cb49a5e9e rtc-ds1307: alarm... |
532 |
int want_irq = false; |
fed40b734 rtc-ds1307: SMBus... |
533 |
unsigned char *buf; |
1abb0dc92 [PATCH] "RTC-fram... |
534 |
|
c065f35c1 rtc-ds1307 become... |
535 |
if (!i2c_check_functionality(adapter, |
fed40b734 rtc-ds1307: SMBus... |
536 537 |
I2C_FUNC_SMBUS_WRITE_BYTE_DATA | I2C_FUNC_SMBUS_I2C_BLOCK)) |
c065f35c1 rtc-ds1307 become... |
538 539 540 541 |
return -EIO; if (!(ds1307 = kzalloc(sizeof(struct ds1307), GFP_KERNEL))) return -ENOMEM; |
045e0e85f rtc-ds1307 cleanups |
542 543 |
ds1307->client = client; |
1abb0dc92 [PATCH] "RTC-fram... |
544 |
i2c_set_clientdata(client, ds1307); |
3760f7367 i2c: Convert most... |
545 |
ds1307->type = id->driver_data; |
fed40b734 rtc-ds1307: SMBus... |
546 |
buf = ds1307->regs; |
045e0e85f rtc-ds1307 cleanups |
547 548 549 550 |
switch (ds1307->type) { case ds_1337: case ds_1339: |
cb49a5e9e rtc-ds1307: alarm... |
551 552 553 554 555 |
/* has IRQ? */ if (ds1307->client->irq > 0 && chip->alarm) { INIT_WORK(&ds1307->work, ds1307_work); want_irq = true; } |
be5f59f4b rtc-ds1307: oscil... |
556 |
/* get registers that the "rtc" read below won't read... */ |
fed40b734 rtc-ds1307: SMBus... |
557 558 |
tmp = i2c_smbus_read_i2c_block_data(ds1307->client, DS1337_REG_CONTROL, 2, buf); |
1abb0dc92 [PATCH] "RTC-fram... |
559 560 561 562 563 564 |
if (tmp != 2) { pr_debug("read error %d ", tmp); err = -EIO; goto exit_free; } |
be5f59f4b rtc-ds1307: oscil... |
565 566 |
/* oscillator off? turn it on, so clock can tick. */ if (ds1307->regs[0] & DS1337_BIT_nEOSC) |
cb49a5e9e rtc-ds1307: alarm... |
567 568 569 570 571 572 573 574 575 576 577 578 579 580 |
ds1307->regs[0] &= ~DS1337_BIT_nEOSC; /* Using IRQ? Disable the square wave and both alarms. * For ds1339, be sure alarms can trigger when we're * running on Vbackup (BBSQI); we assume ds1337 will * ignore that bit */ if (want_irq) { ds1307->regs[0] |= DS1337_BIT_INTCN | DS1339_BIT_BBSQI; ds1307->regs[0] &= ~(DS1337_BIT_A2IE | DS1337_BIT_A1IE); } i2c_smbus_write_byte_data(client, DS1337_REG_CONTROL, ds1307->regs[0]); |
be5f59f4b rtc-ds1307: oscil... |
581 582 583 584 585 586 587 |
/* oscillator fault? clear flag, and warn */ if (ds1307->regs[1] & DS1337_BIT_OSF) { i2c_smbus_write_byte_data(client, DS1337_REG_STATUS, ds1307->regs[1] & ~DS1337_BIT_OSF); dev_warn(&client->dev, "SET TIME! "); |
1abb0dc92 [PATCH] "RTC-fram... |
588 |
} |
045e0e85f rtc-ds1307 cleanups |
589 590 591 592 |
break; default: break; } |
1abb0dc92 [PATCH] "RTC-fram... |
593 594 595 |
read_rtc: /* read RTC registers */ |
fed40b734 rtc-ds1307: SMBus... |
596 597 |
tmp = i2c_smbus_read_i2c_block_data(ds1307->client, 0, 8, buf); if (tmp != 8) { |
1abb0dc92 [PATCH] "RTC-fram... |
598 599 600 601 602 603 604 605 606 607 608 |
pr_debug("read error %d ", tmp); err = -EIO; goto exit_free; } /* minimal sanity checking; some chips (like DS1340) don't * specify the extra bits as must-be-zero, but there are * still a few values that are clearly out-of-range. */ tmp = ds1307->regs[DS1307_REG_SECS]; |
045e0e85f rtc-ds1307 cleanups |
609 610 |
switch (ds1307->type) { case ds_1307: |
045e0e85f rtc-ds1307 cleanups |
611 |
case m41t00: |
be5f59f4b rtc-ds1307: oscil... |
612 |
/* clock halted? turn it on, so clock can tick. */ |
045e0e85f rtc-ds1307 cleanups |
613 |
if (tmp & DS1307_BIT_CH) { |
be5f59f4b rtc-ds1307: oscil... |
614 615 616 |
i2c_smbus_write_byte_data(client, DS1307_REG_SECS, 0); dev_warn(&client->dev, "SET TIME! "); |
045e0e85f rtc-ds1307 cleanups |
617 |
goto read_rtc; |
1abb0dc92 [PATCH] "RTC-fram... |
618 |
} |
045e0e85f rtc-ds1307 cleanups |
619 |
break; |
be5f59f4b rtc-ds1307: oscil... |
620 621 |
case ds_1338: /* clock halted? turn it on, so clock can tick. */ |
045e0e85f rtc-ds1307 cleanups |
622 |
if (tmp & DS1307_BIT_CH) |
be5f59f4b rtc-ds1307: oscil... |
623 624 625 626 627 |
i2c_smbus_write_byte_data(client, DS1307_REG_SECS, 0); /* oscillator fault? clear flag, and warn */ if (ds1307->regs[DS1307_REG_CONTROL] & DS1338_BIT_OSF) { i2c_smbus_write_byte_data(client, DS1307_REG_CONTROL, |
bd16f9ebd rtc-ds1307: typo ... |
628 |
ds1307->regs[DS1307_REG_CONTROL] |
be5f59f4b rtc-ds1307: oscil... |
629 630 631 632 633 |
& ~DS1338_BIT_OSF); dev_warn(&client->dev, "SET TIME! "); goto read_rtc; } |
045e0e85f rtc-ds1307 cleanups |
634 |
break; |
fcd8db002 rtc ds1307: ds_13... |
635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 |
case ds_1340: /* clock halted? turn it on, so clock can tick. */ if (tmp & DS1340_BIT_nEOSC) i2c_smbus_write_byte_data(client, DS1307_REG_SECS, 0); tmp = i2c_smbus_read_byte_data(client, DS1340_REG_FLAG); if (tmp < 0) { pr_debug("read error %d ", tmp); err = -EIO; goto exit_free; } /* oscillator fault? clear flag, and warn */ if (tmp & DS1340_BIT_OSF) { i2c_smbus_write_byte_data(client, DS1340_REG_FLAG, 0); dev_warn(&client->dev, "SET TIME! "); } break; |
c065f35c1 rtc-ds1307 become... |
655 656 |
case ds_1337: case ds_1339: |
045e0e85f rtc-ds1307 cleanups |
657 |
break; |
1abb0dc92 [PATCH] "RTC-fram... |
658 |
} |
045e0e85f rtc-ds1307 cleanups |
659 |
|
1abb0dc92 [PATCH] "RTC-fram... |
660 |
tmp = ds1307->regs[DS1307_REG_HOUR]; |
c065f35c1 rtc-ds1307 become... |
661 662 663 664 665 666 667 668 669 670 671 672 673 674 |
switch (ds1307->type) { case ds_1340: case m41t00: /* NOTE: ignores century bits; fix before deploying * systems that will run through year 2100. */ break; default: if (!(tmp & DS1307_BIT_12HR)) break; /* Be sure we're in 24 hour mode. Multi-master systems * take note... */ |
fe20ba70a drivers/rtc/: use... |
675 |
tmp = bcd2bin(tmp & 0x1f); |
c065f35c1 rtc-ds1307 become... |
676 677 678 679 |
if (tmp == 12) tmp = 0; if (ds1307->regs[DS1307_REG_HOUR] & DS1307_BIT_PM) tmp += 12; |
1abb0dc92 [PATCH] "RTC-fram... |
680 681 |
i2c_smbus_write_byte_data(client, DS1307_REG_HOUR, |
fe20ba70a drivers/rtc/: use... |
682 |
bin2bcd(tmp)); |
1abb0dc92 [PATCH] "RTC-fram... |
683 |
} |
1abb0dc92 [PATCH] "RTC-fram... |
684 685 686 687 688 689 690 |
ds1307->rtc = rtc_device_register(client->name, &client->dev, &ds13xx_rtc_ops, THIS_MODULE); if (IS_ERR(ds1307->rtc)) { err = PTR_ERR(ds1307->rtc); dev_err(&client->dev, "unable to register the class device "); |
c065f35c1 rtc-ds1307 become... |
691 |
goto exit_free; |
1abb0dc92 [PATCH] "RTC-fram... |
692 |
} |
cb49a5e9e rtc-ds1307: alarm... |
693 694 695 696 697 698 699 700 701 702 703 704 705 |
if (want_irq) { err = request_irq(client->irq, ds1307_irq, 0, ds1307->rtc->name, client); if (err) { dev_err(&client->dev, "unable to request IRQ! "); goto exit_irq; } set_bit(HAS_ALARM, &ds1307->flags); dev_dbg(&client->dev, "got IRQ %d ", client->irq); } |
682d73f68 rtc-ds1307 export... |
706 707 708 |
if (chip->nvram56) { err = sysfs_create_bin_file(&client->dev.kobj, &nvram); if (err == 0) { |
cb49a5e9e rtc-ds1307: alarm... |
709 |
set_bit(HAS_NVRAM, &ds1307->flags); |
682d73f68 rtc-ds1307 export... |
710 711 712 713 |
dev_info(&client->dev, "56 bytes nvram "); } } |
1abb0dc92 [PATCH] "RTC-fram... |
714 |
return 0; |
cb49a5e9e rtc-ds1307: alarm... |
715 716 717 |
exit_irq: if (ds1307->rtc) rtc_device_unregister(ds1307->rtc); |
1abb0dc92 [PATCH] "RTC-fram... |
718 719 |
exit_free: kfree(ds1307); |
1abb0dc92 [PATCH] "RTC-fram... |
720 721 |
return err; } |
c065f35c1 rtc-ds1307 become... |
722 |
static int __devexit ds1307_remove(struct i2c_client *client) |
1abb0dc92 [PATCH] "RTC-fram... |
723 |
{ |
cb49a5e9e rtc-ds1307: alarm... |
724 725 726 727 728 729 |
struct ds1307 *ds1307 = i2c_get_clientdata(client); if (test_and_clear_bit(HAS_ALARM, &ds1307->flags)) { free_irq(client->irq, client); cancel_work_sync(&ds1307->work); } |
1abb0dc92 [PATCH] "RTC-fram... |
730 |
|
cb49a5e9e rtc-ds1307: alarm... |
731 |
if (test_and_clear_bit(HAS_NVRAM, &ds1307->flags)) |
682d73f68 rtc-ds1307 export... |
732 |
sysfs_remove_bin_file(&client->dev.kobj, &nvram); |
1abb0dc92 [PATCH] "RTC-fram... |
733 |
rtc_device_unregister(ds1307->rtc); |
1abb0dc92 [PATCH] "RTC-fram... |
734 735 736 737 738 739 |
kfree(ds1307); return 0; } static struct i2c_driver ds1307_driver = { .driver = { |
c065f35c1 rtc-ds1307 become... |
740 |
.name = "rtc-ds1307", |
1abb0dc92 [PATCH] "RTC-fram... |
741 742 |
.owner = THIS_MODULE, }, |
c065f35c1 rtc-ds1307 become... |
743 744 |
.probe = ds1307_probe, .remove = __devexit_p(ds1307_remove), |
3760f7367 i2c: Convert most... |
745 |
.id_table = ds1307_id, |
1abb0dc92 [PATCH] "RTC-fram... |
746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 |
}; static int __init ds1307_init(void) { return i2c_add_driver(&ds1307_driver); } module_init(ds1307_init); static void __exit ds1307_exit(void) { i2c_del_driver(&ds1307_driver); } module_exit(ds1307_exit); MODULE_DESCRIPTION("RTC driver for DS1307 and similar chips"); MODULE_LICENSE("GPL"); |