2005-04-16 18:20:36 -04:00
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/*
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* PCF8563 RTC
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*
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* From Phillips' datasheet:
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*
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* The PCF8563 is a CMOS real-time clock/calendar optimized for low power
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2007-10-19 17:10:43 -04:00
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* consumption. A programmable clock output, interrupt output and voltage
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2005-04-16 18:20:36 -04:00
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* low detector are also provided. All address and data are transferred
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* serially via two-line bidirectional I2C-bus. Maximum bus speed is
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* 400 kbits/s. The built-in word address register is incremented
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2008-01-17 09:17:07 -05:00
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* automatically after each written or read byte.
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2005-04-16 18:20:36 -04:00
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*
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2008-01-17 09:17:07 -05:00
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* Copyright (c) 2002-2007, Axis Communications AB
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2005-04-16 18:20:36 -04:00
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* All rights reserved.
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*
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* Author: Tobias Anderberg <tobiasa@axis.com>.
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*
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/sched.h>
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#include <linux/init.h>
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#include <linux/fs.h>
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#include <linux/ioctl.h>
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#include <linux/delay.h>
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#include <linux/bcd.h>
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2008-01-17 09:17:07 -05:00
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#include <linux/mutex.h>
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2005-04-16 18:20:36 -04:00
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#include <asm/io.h>
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#include <asm/rtc.h>
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2008-01-17 09:17:07 -05:00
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2005-04-16 18:20:36 -04:00
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#include "i2c.h"
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2008-01-17 09:17:07 -05:00
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#define PCF8563_MAJOR 121 /* Local major number. */
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#define DEVICE_NAME "rtc" /* Name which is registered in /proc/devices. */
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2005-04-16 18:20:36 -04:00
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#define PCF8563_NAME "PCF8563"
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2008-01-17 09:17:07 -05:00
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#define DRIVER_VERSION "$Revision: 1.24 $"
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2005-04-16 18:20:36 -04:00
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/* I2C bus slave registers. */
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#define RTC_I2C_READ 0xa3
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#define RTC_I2C_WRITE 0xa2
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/* Two simple wrapper macros, saves a few keystrokes. */
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#define rtc_read(x) i2c_readreg(RTC_I2C_READ, x)
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#define rtc_write(x,y) i2c_writereg(RTC_I2C_WRITE, x, y)
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2005-07-27 14:44:34 -04:00
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2010-09-11 12:18:22 -04:00
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static DEFINE_MUTEX(pcf8563_mutex);
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2008-01-17 09:17:07 -05:00
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static DEFINE_MUTEX(rtc_lock); /* Protect state etc */
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2005-04-16 18:20:36 -04:00
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static const unsigned char days_in_month[] =
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{ 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
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2010-04-27 10:24:21 -04:00
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static long pcf8563_unlocked_ioctl(struct file *, unsigned int, unsigned long);
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2005-04-16 18:20:36 -04:00
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2008-01-17 09:17:07 -05:00
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/* Cache VL bit value read at driver init since writing the RTC_SECOND
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* register clears the VL status.
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*/
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static int voltage_low;
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2007-02-12 03:55:31 -05:00
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static const struct file_operations pcf8563_fops = {
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2005-04-16 18:20:36 -04:00
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.owner = THIS_MODULE,
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2010-04-27 10:24:21 -04:00
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.unlocked_ioctl = pcf8563_unlocked_ioctl,
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llseek: automatically add .llseek fop
All file_operations should get a .llseek operation so we can make
nonseekable_open the default for future file operations without a
.llseek pointer.
The three cases that we can automatically detect are no_llseek, seq_lseek
and default_llseek. For cases where we can we can automatically prove that
the file offset is always ignored, we use noop_llseek, which maintains
the current behavior of not returning an error from a seek.
New drivers should normally not use noop_llseek but instead use no_llseek
and call nonseekable_open at open time. Existing drivers can be converted
to do the same when the maintainer knows for certain that no user code
relies on calling seek on the device file.
The generated code is often incorrectly indented and right now contains
comments that clarify for each added line why a specific variant was
chosen. In the version that gets submitted upstream, the comments will
be gone and I will manually fix the indentation, because there does not
seem to be a way to do that using coccinelle.
Some amount of new code is currently sitting in linux-next that should get
the same modifications, which I will do at the end of the merge window.
Many thanks to Julia Lawall for helping me learn to write a semantic
patch that does all this.
===== begin semantic patch =====
// This adds an llseek= method to all file operations,
// as a preparation for making no_llseek the default.
//
// The rules are
// - use no_llseek explicitly if we do nonseekable_open
// - use seq_lseek for sequential files
// - use default_llseek if we know we access f_pos
// - use noop_llseek if we know we don't access f_pos,
// but we still want to allow users to call lseek
//
@ open1 exists @
identifier nested_open;
@@
nested_open(...)
{
<+...
nonseekable_open(...)
...+>
}
@ open exists@
identifier open_f;
identifier i, f;
identifier open1.nested_open;
@@
int open_f(struct inode *i, struct file *f)
{
<+...
(
nonseekable_open(...)
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nested_open(...)
)
...+>
}
@ read disable optional_qualifier exists @
identifier read_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
expression E;
identifier func;
@@
ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off)
{
<+...
(
*off = E
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*off += E
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func(..., off, ...)
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E = *off
)
...+>
}
@ read_no_fpos disable optional_qualifier exists @
identifier read_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
@@
ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off)
{
... when != off
}
@ write @
identifier write_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
expression E;
identifier func;
@@
ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off)
{
<+...
(
*off = E
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*off += E
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func(..., off, ...)
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E = *off
)
...+>
}
@ write_no_fpos @
identifier write_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
@@
ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off)
{
... when != off
}
@ fops0 @
identifier fops;
@@
struct file_operations fops = {
...
};
@ has_llseek depends on fops0 @
identifier fops0.fops;
identifier llseek_f;
@@
struct file_operations fops = {
...
.llseek = llseek_f,
...
};
@ has_read depends on fops0 @
identifier fops0.fops;
identifier read_f;
@@
struct file_operations fops = {
...
.read = read_f,
...
};
@ has_write depends on fops0 @
identifier fops0.fops;
identifier write_f;
@@
struct file_operations fops = {
...
.write = write_f,
...
};
@ has_open depends on fops0 @
identifier fops0.fops;
identifier open_f;
@@
struct file_operations fops = {
...
.open = open_f,
...
};
// use no_llseek if we call nonseekable_open
////////////////////////////////////////////
@ nonseekable1 depends on !has_llseek && has_open @
identifier fops0.fops;
identifier nso ~= "nonseekable_open";
@@
struct file_operations fops = {
... .open = nso, ...
+.llseek = no_llseek, /* nonseekable */
};
@ nonseekable2 depends on !has_llseek @
identifier fops0.fops;
identifier open.open_f;
@@
struct file_operations fops = {
... .open = open_f, ...
+.llseek = no_llseek, /* open uses nonseekable */
};
// use seq_lseek for sequential files
/////////////////////////////////////
@ seq depends on !has_llseek @
identifier fops0.fops;
identifier sr ~= "seq_read";
@@
struct file_operations fops = {
... .read = sr, ...
+.llseek = seq_lseek, /* we have seq_read */
};
// use default_llseek if there is a readdir
///////////////////////////////////////////
@ fops1 depends on !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier readdir_e;
@@
// any other fop is used that changes pos
struct file_operations fops = {
... .readdir = readdir_e, ...
+.llseek = default_llseek, /* readdir is present */
};
// use default_llseek if at least one of read/write touches f_pos
/////////////////////////////////////////////////////////////////
@ fops2 depends on !fops1 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read.read_f;
@@
// read fops use offset
struct file_operations fops = {
... .read = read_f, ...
+.llseek = default_llseek, /* read accesses f_pos */
};
@ fops3 depends on !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier write.write_f;
@@
// write fops use offset
struct file_operations fops = {
... .write = write_f, ...
+ .llseek = default_llseek, /* write accesses f_pos */
};
// Use noop_llseek if neither read nor write accesses f_pos
///////////////////////////////////////////////////////////
@ fops4 depends on !fops1 && !fops2 && !fops3 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read_no_fpos.read_f;
identifier write_no_fpos.write_f;
@@
// write fops use offset
struct file_operations fops = {
...
.write = write_f,
.read = read_f,
...
+.llseek = noop_llseek, /* read and write both use no f_pos */
};
@ depends on has_write && !has_read && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier write_no_fpos.write_f;
@@
struct file_operations fops = {
... .write = write_f, ...
+.llseek = noop_llseek, /* write uses no f_pos */
};
@ depends on has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read_no_fpos.read_f;
@@
struct file_operations fops = {
... .read = read_f, ...
+.llseek = noop_llseek, /* read uses no f_pos */
};
@ depends on !has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
@@
struct file_operations fops = {
...
+.llseek = noop_llseek, /* no read or write fn */
};
===== End semantic patch =====
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Julia Lawall <julia@diku.dk>
Cc: Christoph Hellwig <hch@infradead.org>
2010-08-15 12:52:59 -04:00
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.llseek = noop_llseek,
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2005-04-16 18:20:36 -04:00
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};
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unsigned char
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2008-01-17 09:17:07 -05:00
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pcf8563_readreg(int reg)
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2005-04-16 18:20:36 -04:00
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{
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2008-01-17 09:17:07 -05:00
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unsigned char res = rtc_read(reg);
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/* The PCF8563 does not return 0 for unimplemented bits. */
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switch (reg) {
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case RTC_SECONDS:
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case RTC_MINUTES:
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res &= 0x7F;
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break;
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case RTC_HOURS:
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case RTC_DAY_OF_MONTH:
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res &= 0x3F;
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break;
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case RTC_WEEKDAY:
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res &= 0x07;
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break;
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case RTC_MONTH:
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res &= 0x1F;
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break;
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case RTC_CONTROL1:
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res &= 0xA8;
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break;
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case RTC_CONTROL2:
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res &= 0x1F;
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break;
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case RTC_CLOCKOUT_FREQ:
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case RTC_TIMER_CONTROL:
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res &= 0x83;
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break;
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2005-04-16 18:20:36 -04:00
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}
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return res;
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}
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void
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2008-01-17 09:17:07 -05:00
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pcf8563_writereg(int reg, unsigned char val)
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2005-04-16 18:20:36 -04:00
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{
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rtc_write(reg, val);
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}
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void
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get_rtc_time(struct rtc_time *tm)
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{
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2008-01-17 09:17:07 -05:00
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tm->tm_sec = rtc_read(RTC_SECONDS);
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tm->tm_min = rtc_read(RTC_MINUTES);
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2005-04-16 18:20:36 -04:00
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tm->tm_hour = rtc_read(RTC_HOURS);
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tm->tm_mday = rtc_read(RTC_DAY_OF_MONTH);
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2008-01-17 09:17:07 -05:00
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tm->tm_wday = rtc_read(RTC_WEEKDAY);
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tm->tm_mon = rtc_read(RTC_MONTH);
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2005-04-16 18:20:36 -04:00
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tm->tm_year = rtc_read(RTC_YEAR);
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2008-01-17 09:17:07 -05:00
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if (tm->tm_sec & 0x80) {
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printk(KERN_ERR "%s: RTC Voltage Low - reliable date/time "
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"information is no longer guaranteed!\n", PCF8563_NAME);
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}
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2005-04-16 18:20:36 -04:00
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2008-10-18 23:28:40 -04:00
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tm->tm_year = bcd2bin(tm->tm_year) +
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2008-01-17 09:17:07 -05:00
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((tm->tm_mon & 0x80) ? 100 : 0);
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tm->tm_sec &= 0x7F;
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tm->tm_min &= 0x7F;
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tm->tm_hour &= 0x3F;
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tm->tm_mday &= 0x3F;
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tm->tm_wday &= 0x07; /* Not coded in BCD. */
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tm->tm_mon &= 0x1F;
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2005-04-16 18:20:36 -04:00
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2008-10-18 23:28:40 -04:00
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tm->tm_sec = bcd2bin(tm->tm_sec);
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tm->tm_min = bcd2bin(tm->tm_min);
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tm->tm_hour = bcd2bin(tm->tm_hour);
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tm->tm_mday = bcd2bin(tm->tm_mday);
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tm->tm_mon = bcd2bin(tm->tm_mon);
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2005-04-16 18:20:36 -04:00
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tm->tm_mon--; /* Month is 1..12 in RTC but 0..11 in linux */
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}
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int __init
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pcf8563_init(void)
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{
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2008-01-17 09:17:07 -05:00
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static int res;
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static int first = 1;
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if (!first)
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return res;
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first = 0;
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/* Initiate the i2c protocol. */
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res = i2c_init();
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if (res < 0) {
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printk(KERN_CRIT "pcf8563_init: Failed to init i2c.\n");
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return res;
|
2005-07-27 14:44:34 -04:00
|
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}
|
2005-04-16 18:20:36 -04:00
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/*
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* First of all we need to reset the chip. This is done by
|
2008-01-17 09:17:07 -05:00
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* clearing control1, control2 and clk freq and resetting
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* all alarms.
|
2005-04-16 18:20:36 -04:00
|
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*/
|
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if (rtc_write(RTC_CONTROL1, 0x00) < 0)
|
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goto err;
|
|
|
|
|
|
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if (rtc_write(RTC_CONTROL2, 0x00) < 0)
|
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goto err;
|
|
|
|
|
|
|
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if (rtc_write(RTC_CLOCKOUT_FREQ, 0x00) < 0)
|
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|
|
goto err;
|
|
|
|
|
2008-01-17 09:17:07 -05:00
|
|
|
if (rtc_write(RTC_TIMER_CONTROL, 0x03) < 0)
|
2005-04-16 18:20:36 -04:00
|
|
|
goto err;
|
2008-01-17 09:17:07 -05:00
|
|
|
|
2005-04-16 18:20:36 -04:00
|
|
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/* Reset the alarms. */
|
2008-01-17 09:17:07 -05:00
|
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if (rtc_write(RTC_MINUTE_ALARM, 0x80) < 0)
|
2005-04-16 18:20:36 -04:00
|
|
|
goto err;
|
2008-01-17 09:17:07 -05:00
|
|
|
|
|
|
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if (rtc_write(RTC_HOUR_ALARM, 0x80) < 0)
|
2005-04-16 18:20:36 -04:00
|
|
|
goto err;
|
2008-01-17 09:17:07 -05:00
|
|
|
|
|
|
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if (rtc_write(RTC_DAY_ALARM, 0x80) < 0)
|
2005-04-16 18:20:36 -04:00
|
|
|
goto err;
|
2008-01-17 09:17:07 -05:00
|
|
|
|
|
|
|
if (rtc_write(RTC_WEEKDAY_ALARM, 0x80) < 0)
|
2005-04-16 18:20:36 -04:00
|
|
|
goto err;
|
2008-01-17 09:17:07 -05:00
|
|
|
|
|
|
|
/* Check for low voltage, and warn about it. */
|
|
|
|
if (rtc_read(RTC_SECONDS) & 0x80) {
|
|
|
|
voltage_low = 1;
|
|
|
|
printk(KERN_WARNING "%s: RTC Voltage Low - reliable "
|
|
|
|
"date/time information is no longer guaranteed!\n",
|
|
|
|
PCF8563_NAME);
|
|
|
|
}
|
|
|
|
|
|
|
|
return res;
|
2005-04-16 18:20:36 -04:00
|
|
|
|
|
|
|
err:
|
|
|
|
printk(KERN_INFO "%s: Error initializing chip.\n", PCF8563_NAME);
|
2008-01-17 09:17:07 -05:00
|
|
|
res = -1;
|
|
|
|
return res;
|
2005-04-16 18:20:36 -04:00
|
|
|
}
|
|
|
|
|
|
|
|
void __exit
|
|
|
|
pcf8563_exit(void)
|
|
|
|
{
|
2007-07-19 04:47:50 -04:00
|
|
|
unregister_chrdev(PCF8563_MAJOR, DEVICE_NAME);
|
2005-04-16 18:20:36 -04:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* ioctl calls for this driver. Why return -ENOTTY upon error? Because
|
|
|
|
* POSIX says so!
|
|
|
|
*/
|
2010-04-27 10:24:21 -04:00
|
|
|
static int pcf8563_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
|
2005-04-16 18:20:36 -04:00
|
|
|
{
|
|
|
|
/* Some sanity checks. */
|
|
|
|
if (_IOC_TYPE(cmd) != RTC_MAGIC)
|
|
|
|
return -ENOTTY;
|
|
|
|
|
|
|
|
if (_IOC_NR(cmd) > RTC_MAX_IOCTL)
|
|
|
|
return -ENOTTY;
|
|
|
|
|
|
|
|
switch (cmd) {
|
2008-01-17 09:17:07 -05:00
|
|
|
case RTC_RD_TIME:
|
|
|
|
{
|
|
|
|
struct rtc_time tm;
|
2005-04-16 18:20:36 -04:00
|
|
|
|
2008-01-17 09:17:07 -05:00
|
|
|
mutex_lock(&rtc_lock);
|
|
|
|
memset(&tm, 0, sizeof tm);
|
|
|
|
get_rtc_time(&tm);
|
2005-04-16 18:20:36 -04:00
|
|
|
|
2008-01-17 09:17:07 -05:00
|
|
|
if (copy_to_user((struct rtc_time *) arg, &tm,
|
|
|
|
sizeof tm)) {
|
2008-06-29 16:50:56 -04:00
|
|
|
mutex_unlock(&rtc_lock);
|
2008-01-17 09:17:07 -05:00
|
|
|
return -EFAULT;
|
|
|
|
}
|
|
|
|
|
|
|
|
mutex_unlock(&rtc_lock);
|
2005-04-16 18:20:36 -04:00
|
|
|
|
2008-01-17 09:17:07 -05:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
case RTC_SET_TIME:
|
|
|
|
{
|
|
|
|
int leap;
|
|
|
|
int year;
|
|
|
|
int century;
|
|
|
|
struct rtc_time tm;
|
|
|
|
|
|
|
|
memset(&tm, 0, sizeof tm);
|
|
|
|
if (!capable(CAP_SYS_TIME))
|
|
|
|
return -EPERM;
|
|
|
|
|
|
|
|
if (copy_from_user(&tm, (struct rtc_time *) arg, sizeof tm))
|
|
|
|
return -EFAULT;
|
|
|
|
|
|
|
|
/* Convert from struct tm to struct rtc_time. */
|
|
|
|
tm.tm_year += 1900;
|
|
|
|
tm.tm_mon += 1;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Check if tm.tm_year is a leap year. A year is a leap
|
|
|
|
* year if it is divisible by 4 but not 100, except
|
|
|
|
* that years divisible by 400 _are_ leap years.
|
|
|
|
*/
|
|
|
|
year = tm.tm_year;
|
|
|
|
leap = (tm.tm_mon == 2) &&
|
|
|
|
((year % 4 == 0 && year % 100 != 0) || year % 400 == 0);
|
|
|
|
|
|
|
|
/* Perform some sanity checks. */
|
|
|
|
if ((tm.tm_year < 1970) ||
|
|
|
|
(tm.tm_mon > 12) ||
|
|
|
|
(tm.tm_mday == 0) ||
|
|
|
|
(tm.tm_mday > days_in_month[tm.tm_mon] + leap) ||
|
|
|
|
(tm.tm_wday >= 7) ||
|
|
|
|
(tm.tm_hour >= 24) ||
|
|
|
|
(tm.tm_min >= 60) ||
|
|
|
|
(tm.tm_sec >= 60))
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
century = (tm.tm_year >= 2000) ? 0x80 : 0;
|
|
|
|
tm.tm_year = tm.tm_year % 100;
|
|
|
|
|
2008-10-18 23:28:40 -04:00
|
|
|
tm.tm_year = bin2bcd(tm.tm_year);
|
|
|
|
tm.tm_mon = bin2bcd(tm.tm_mon);
|
|
|
|
tm.tm_mday = bin2bcd(tm.tm_mday);
|
|
|
|
tm.tm_hour = bin2bcd(tm.tm_hour);
|
|
|
|
tm.tm_min = bin2bcd(tm.tm_min);
|
|
|
|
tm.tm_sec = bin2bcd(tm.tm_sec);
|
2008-01-17 09:17:07 -05:00
|
|
|
tm.tm_mon |= century;
|
|
|
|
|
|
|
|
mutex_lock(&rtc_lock);
|
|
|
|
|
|
|
|
rtc_write(RTC_YEAR, tm.tm_year);
|
|
|
|
rtc_write(RTC_MONTH, tm.tm_mon);
|
|
|
|
rtc_write(RTC_WEEKDAY, tm.tm_wday); /* Not coded in BCD. */
|
|
|
|
rtc_write(RTC_DAY_OF_MONTH, tm.tm_mday);
|
|
|
|
rtc_write(RTC_HOURS, tm.tm_hour);
|
|
|
|
rtc_write(RTC_MINUTES, tm.tm_min);
|
|
|
|
rtc_write(RTC_SECONDS, tm.tm_sec);
|
|
|
|
|
|
|
|
mutex_unlock(&rtc_lock);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
case RTC_VL_READ:
|
|
|
|
if (voltage_low) {
|
|
|
|
printk(KERN_ERR "%s: RTC Voltage Low - "
|
|
|
|
"reliable date/time information is no "
|
|
|
|
"longer guaranteed!\n", PCF8563_NAME);
|
2005-04-16 18:20:36 -04:00
|
|
|
}
|
|
|
|
|
2008-01-17 09:17:07 -05:00
|
|
|
if (copy_to_user((int *) arg, &voltage_low, sizeof(int)))
|
|
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
case RTC_VL_CLR:
|
|
|
|
{
|
|
|
|
/* Clear the VL bit in the seconds register in case
|
|
|
|
* the time has not been set already (which would
|
|
|
|
* have cleared it). This does not really matter
|
|
|
|
* because of the cached voltage_low value but do it
|
|
|
|
* anyway for consistency. */
|
|
|
|
|
|
|
|
int ret = rtc_read(RTC_SECONDS);
|
|
|
|
|
|
|
|
rtc_write(RTC_SECONDS, (ret & 0x7F));
|
|
|
|
|
|
|
|
/* Clear the cached value. */
|
|
|
|
voltage_low = 0;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
default:
|
|
|
|
return -ENOTTY;
|
2005-04-16 18:20:36 -04:00
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2010-04-27 10:24:21 -04:00
|
|
|
static long pcf8563_unlocked_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
|
2010-09-11 12:18:22 -04:00
|
|
|
mutex_lock(&pcf8563_mutex);
|
2010-04-27 10:24:21 -04:00
|
|
|
return pcf8563_ioctl(filp, cmd, arg);
|
2010-09-11 12:18:22 -04:00
|
|
|
mutex_unlock(&pcf8563_mutex);
|
2010-04-27 10:24:21 -04:00
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2008-01-17 09:17:07 -05:00
|
|
|
static int __init pcf8563_register(void)
|
2005-04-16 18:20:36 -04:00
|
|
|
{
|
2008-01-17 09:17:07 -05:00
|
|
|
if (pcf8563_init() < 0) {
|
|
|
|
printk(KERN_INFO "%s: Unable to initialize Real-Time Clock "
|
|
|
|
"Driver, %s\n", PCF8563_NAME, DRIVER_VERSION);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
2005-04-16 18:20:36 -04:00
|
|
|
if (register_chrdev(PCF8563_MAJOR, DEVICE_NAME, &pcf8563_fops) < 0) {
|
2007-02-17 14:12:12 -05:00
|
|
|
printk(KERN_INFO "%s: Unable to get major number %d for RTC device.\n",
|
2005-04-16 18:20:36 -04:00
|
|
|
PCF8563_NAME, PCF8563_MAJOR);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
2008-01-17 09:17:07 -05:00
|
|
|
printk(KERN_INFO "%s Real-Time Clock Driver, %s\n", PCF8563_NAME,
|
|
|
|
DRIVER_VERSION);
|
|
|
|
|
|
|
|
/* Check for low voltage, and warn about it. */
|
|
|
|
if (voltage_low) {
|
|
|
|
printk(KERN_WARNING "%s: RTC Voltage Low - reliable date/time "
|
|
|
|
"information is no longer guaranteed!\n", PCF8563_NAME);
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
2005-04-16 18:20:36 -04:00
|
|
|
}
|
|
|
|
|
|
|
|
module_init(pcf8563_register);
|
|
|
|
module_exit(pcf8563_exit);
|