2019-06-04 02:11:33 -06:00
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// SPDX-License-Identifier: GPL-2.0-only
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2006-03-27 02:16:44 -07:00
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/*
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* An I2C driver for the Philips PCF8563 RTC
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* Copyright 2005-06 Tower Technologies
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*
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* Author: Alessandro Zummo <a.zummo@towertech.it>
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* Maintainers: http://www.nslu2-linux.org/
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*
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* based on the other drivers in this same directory.
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*
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* http://www.semiconductors.philips.com/acrobat/datasheets/PCF8563-04.pdf
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*/
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2015-10-16 05:31:29 -06:00
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#include <linux/clk-provider.h>
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2006-03-27 02:16:44 -07:00
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#include <linux/i2c.h>
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#include <linux/bcd.h>
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#include <linux/rtc.h>
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include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 02:04:11 -06:00
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#include <linux/slab.h>
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2011-05-27 07:57:25 -06:00
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#include <linux/module.h>
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2012-07-30 15:41:59 -06:00
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#include <linux/of.h>
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2013-07-03 16:07:51 -06:00
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#include <linux/err.h>
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2006-03-27 02:16:44 -07:00
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#define PCF8563_REG_ST1 0x00 /* status */
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#define PCF8563_REG_ST2 0x01
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2019-12-18 01:25:53 -07:00
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#define PCF8563_BIT_AIE BIT(1)
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#define PCF8563_BIT_AF BIT(3)
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2014-12-10 16:53:34 -07:00
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#define PCF8563_BITS_ST2_N (7 << 5)
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2006-03-27 02:16:44 -07:00
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#define PCF8563_REG_SC 0x02 /* datetime */
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#define PCF8563_REG_MN 0x03
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#define PCF8563_REG_HR 0x04
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#define PCF8563_REG_DM 0x05
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#define PCF8563_REG_DW 0x06
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#define PCF8563_REG_MO 0x07
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#define PCF8563_REG_YR 0x08
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#define PCF8563_REG_AMN 0x09 /* alarm */
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2015-10-16 05:31:29 -06:00
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#define PCF8563_REG_CLKO 0x0D /* clock out */
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#define PCF8563_REG_CLKO_FE 0x80 /* clock out enabled */
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#define PCF8563_REG_CLKO_F_MASK 0x03 /* frequenc mask */
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#define PCF8563_REG_CLKO_F_32768HZ 0x00
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#define PCF8563_REG_CLKO_F_1024HZ 0x01
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#define PCF8563_REG_CLKO_F_32HZ 0x02
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#define PCF8563_REG_CLKO_F_1HZ 0x03
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2006-03-27 02:16:44 -07:00
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#define PCF8563_REG_TMRC 0x0E /* timer control */
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2014-12-10 16:53:43 -07:00
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#define PCF8563_TMRC_ENABLE BIT(7)
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#define PCF8563_TMRC_4096 0
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#define PCF8563_TMRC_64 1
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#define PCF8563_TMRC_1 2
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#define PCF8563_TMRC_1_60 3
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#define PCF8563_TMRC_MASK 3
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2006-03-27 02:16:44 -07:00
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#define PCF8563_REG_TMR 0x0F /* timer */
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#define PCF8563_SC_LV 0x80 /* low voltage */
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#define PCF8563_MO_C 0x80 /* century */
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2008-04-28 03:11:54 -06:00
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static struct i2c_driver pcf8563_driver;
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2007-02-08 15:20:24 -07:00
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struct pcf8563 {
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2008-04-28 03:11:54 -06:00
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struct rtc_device *rtc;
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2007-02-08 15:20:24 -07:00
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/*
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* The meaning of MO_C bit varies by the chip type.
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* From PCF8563 datasheet: this bit is toggled when the years
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* register overflows from 99 to 00
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* 0 indicates the century is 20xx
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* 1 indicates the century is 19xx
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* From RTC8564 datasheet: this bit indicates change of
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* century. When the year digit data overflows from 99 to 00,
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* this bit is set. By presetting it to 0 while still in the
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* 20th century, it will be set in year 2000, ...
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* There seems no reliable way to know how the system use this
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* bit. So let's do it heuristically, assuming we are live in
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* 1970...2069.
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*/
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int c_polarity; /* 0: MO_C=1 means 19xx, otherwise MO_C=1 means 20xx */
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2014-08-08 15:20:18 -06:00
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struct i2c_client *client;
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2015-10-16 05:31:29 -06:00
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#ifdef CONFIG_COMMON_CLK
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struct clk_hw clkout_hw;
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#endif
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2007-02-08 15:20:24 -07:00
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};
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2014-08-08 15:20:16 -06:00
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static int pcf8563_read_block_data(struct i2c_client *client, unsigned char reg,
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unsigned char length, unsigned char *buf)
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2006-03-27 02:16:44 -07:00
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{
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struct i2c_msg msgs[] = {
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2012-10-04 18:14:25 -06:00
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{/* setup read ptr */
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.addr = client->addr,
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.len = 1,
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2014-08-08 15:20:16 -06:00
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.buf = ®,
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2012-10-04 18:14:25 -06:00
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},
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2014-08-08 15:20:16 -06:00
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{
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2012-10-04 18:14:25 -06:00
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.addr = client->addr,
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.flags = I2C_M_RD,
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2014-08-08 15:20:16 -06:00
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.len = length,
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2012-10-04 18:14:25 -06:00
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.buf = buf
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},
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2006-03-27 02:16:44 -07:00
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};
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if ((i2c_transfer(client->adapter, msgs, 2)) != 2) {
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2008-04-28 03:12:00 -06:00
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dev_err(&client->dev, "%s: read error\n", __func__);
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2006-03-27 02:16:44 -07:00
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return -EIO;
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}
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2014-08-08 15:20:16 -06:00
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return 0;
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}
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static int pcf8563_write_block_data(struct i2c_client *client,
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unsigned char reg, unsigned char length,
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unsigned char *buf)
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{
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int i, err;
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for (i = 0; i < length; i++) {
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unsigned char data[2] = { reg + i, buf[i] };
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err = i2c_master_send(client, data, sizeof(data));
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if (err != sizeof(data)) {
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dev_err(&client->dev,
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"%s: err=%d addr=%02x, data=%02x\n",
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__func__, err, data[0], data[1]);
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return -EIO;
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}
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}
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return 0;
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}
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2014-08-08 15:20:18 -06:00
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static int pcf8563_set_alarm_mode(struct i2c_client *client, bool on)
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{
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2014-12-10 16:53:31 -07:00
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unsigned char buf;
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2014-08-08 15:20:18 -06:00
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int err;
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2014-12-10 16:53:31 -07:00
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err = pcf8563_read_block_data(client, PCF8563_REG_ST2, 1, &buf);
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2014-08-08 15:20:18 -06:00
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if (err < 0)
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return err;
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if (on)
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2014-12-10 16:53:31 -07:00
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buf |= PCF8563_BIT_AIE;
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2014-08-08 15:20:18 -06:00
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else
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2014-12-10 16:53:31 -07:00
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buf &= ~PCF8563_BIT_AIE;
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2014-08-08 15:20:18 -06:00
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2014-12-10 16:53:34 -07:00
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buf &= ~(PCF8563_BIT_AF | PCF8563_BITS_ST2_N);
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2014-08-08 15:20:18 -06:00
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2014-12-10 16:53:31 -07:00
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err = pcf8563_write_block_data(client, PCF8563_REG_ST2, 1, &buf);
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2014-08-08 15:20:18 -06:00
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if (err < 0) {
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dev_err(&client->dev, "%s: write error\n", __func__);
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return -EIO;
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}
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return 0;
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}
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static int pcf8563_get_alarm_mode(struct i2c_client *client, unsigned char *en,
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unsigned char *pen)
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{
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unsigned char buf;
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int err;
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err = pcf8563_read_block_data(client, PCF8563_REG_ST2, 1, &buf);
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if (err)
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return err;
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if (en)
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*en = !!(buf & PCF8563_BIT_AIE);
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if (pen)
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*pen = !!(buf & PCF8563_BIT_AF);
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return 0;
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}
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static irqreturn_t pcf8563_irq(int irq, void *dev_id)
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{
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struct pcf8563 *pcf8563 = i2c_get_clientdata(dev_id);
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int err;
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char pending;
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err = pcf8563_get_alarm_mode(pcf8563->client, NULL, &pending);
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2014-10-13 16:53:07 -06:00
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if (err)
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2014-10-13 16:53:10 -06:00
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return IRQ_NONE;
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2014-08-08 15:20:18 -06:00
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if (pending) {
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rtc_update_irq(pcf8563->rtc, 1, RTC_IRQF | RTC_AF);
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pcf8563_set_alarm_mode(pcf8563->client, 1);
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return IRQ_HANDLED;
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}
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return IRQ_NONE;
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}
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2014-08-08 15:20:16 -06:00
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/*
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* In the routines that deal directly with the pcf8563 hardware, we use
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* rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch.
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*/
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2019-08-29 15:25:46 -06:00
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static int pcf8563_rtc_read_time(struct device *dev, struct rtc_time *tm)
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2014-08-08 15:20:16 -06:00
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{
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2019-08-29 15:25:46 -06:00
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struct i2c_client *client = to_i2c_client(dev);
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2014-08-08 15:20:16 -06:00
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struct pcf8563 *pcf8563 = i2c_get_clientdata(client);
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unsigned char buf[9];
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int err;
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err = pcf8563_read_block_data(client, PCF8563_REG_ST1, 9, buf);
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if (err)
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return err;
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2012-05-29 16:07:36 -06:00
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if (buf[PCF8563_REG_SC] & PCF8563_SC_LV) {
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2015-05-28 00:48:45 -06:00
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dev_err(&client->dev,
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2006-03-27 02:16:44 -07:00
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"low voltage detected, date/time is not reliable.\n");
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2015-05-28 00:48:45 -06:00
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return -EINVAL;
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2012-05-29 16:07:36 -06:00
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}
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2006-03-27 02:16:44 -07:00
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dev_dbg(&client->dev,
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"%s: raw data is st1=%02x, st2=%02x, sec=%02x, min=%02x, hr=%02x, "
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"mday=%02x, wday=%02x, mon=%02x, year=%02x\n",
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2008-04-28 03:12:00 -06:00
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__func__,
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2006-03-27 02:16:44 -07:00
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buf[0], buf[1], buf[2], buf[3],
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buf[4], buf[5], buf[6], buf[7],
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buf[8]);
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2008-10-18 21:28:41 -06:00
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tm->tm_sec = bcd2bin(buf[PCF8563_REG_SC] & 0x7F);
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tm->tm_min = bcd2bin(buf[PCF8563_REG_MN] & 0x7F);
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tm->tm_hour = bcd2bin(buf[PCF8563_REG_HR] & 0x3F); /* rtc hr 0-23 */
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tm->tm_mday = bcd2bin(buf[PCF8563_REG_DM] & 0x3F);
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2006-03-27 02:16:44 -07:00
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tm->tm_wday = buf[PCF8563_REG_DW] & 0x07;
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2008-10-18 21:28:41 -06:00
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tm->tm_mon = bcd2bin(buf[PCF8563_REG_MO] & 0x1F) - 1; /* rtc mn 1-12 */
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2019-08-29 15:25:47 -06:00
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tm->tm_year = bcd2bin(buf[PCF8563_REG_YR]) + 100;
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2007-02-08 15:20:24 -07:00
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/* detect the polarity heuristically. see note above. */
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pcf8563->c_polarity = (buf[PCF8563_REG_MO] & PCF8563_MO_C) ?
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(tm->tm_year >= 100) : (tm->tm_year < 100);
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2006-03-27 02:16:44 -07:00
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dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
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"mday=%d, mon=%d, year=%d, wday=%d\n",
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2008-04-28 03:12:00 -06:00
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__func__,
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2006-03-27 02:16:44 -07:00
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tm->tm_sec, tm->tm_min, tm->tm_hour,
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tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
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return 0;
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}
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2019-08-29 15:25:46 -06:00
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static int pcf8563_rtc_set_time(struct device *dev, struct rtc_time *tm)
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2006-03-27 02:16:44 -07:00
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{
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2019-08-29 15:25:46 -06:00
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struct i2c_client *client = to_i2c_client(dev);
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2008-04-28 03:11:54 -06:00
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struct pcf8563 *pcf8563 = i2c_get_clientdata(client);
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2006-03-27 02:16:44 -07:00
|
|
|
unsigned char buf[9];
|
|
|
|
|
|
|
|
dev_dbg(&client->dev, "%s: secs=%d, mins=%d, hours=%d, "
|
|
|
|
"mday=%d, mon=%d, year=%d, wday=%d\n",
|
2008-04-28 03:12:00 -06:00
|
|
|
__func__,
|
2006-03-27 02:16:44 -07:00
|
|
|
tm->tm_sec, tm->tm_min, tm->tm_hour,
|
|
|
|
tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
|
|
|
|
|
|
|
|
/* hours, minutes and seconds */
|
2008-10-18 21:28:41 -06:00
|
|
|
buf[PCF8563_REG_SC] = bin2bcd(tm->tm_sec);
|
|
|
|
buf[PCF8563_REG_MN] = bin2bcd(tm->tm_min);
|
|
|
|
buf[PCF8563_REG_HR] = bin2bcd(tm->tm_hour);
|
2006-03-27 02:16:44 -07:00
|
|
|
|
2008-10-18 21:28:41 -06:00
|
|
|
buf[PCF8563_REG_DM] = bin2bcd(tm->tm_mday);
|
2006-03-27 02:16:44 -07:00
|
|
|
|
|
|
|
/* month, 1 - 12 */
|
2008-10-18 21:28:41 -06:00
|
|
|
buf[PCF8563_REG_MO] = bin2bcd(tm->tm_mon + 1);
|
2006-03-27 02:16:44 -07:00
|
|
|
|
|
|
|
/* year and century */
|
2019-08-29 15:25:47 -06:00
|
|
|
buf[PCF8563_REG_YR] = bin2bcd(tm->tm_year - 100);
|
2007-02-08 15:20:24 -07:00
|
|
|
if (pcf8563->c_polarity ? (tm->tm_year >= 100) : (tm->tm_year < 100))
|
2006-03-27 02:16:44 -07:00
|
|
|
buf[PCF8563_REG_MO] |= PCF8563_MO_C;
|
|
|
|
|
|
|
|
buf[PCF8563_REG_DW] = tm->tm_wday & 0x07;
|
|
|
|
|
2015-04-16 13:45:01 -06:00
|
|
|
return pcf8563_write_block_data(client, PCF8563_REG_SC,
|
2014-08-08 15:20:16 -06:00
|
|
|
9 - PCF8563_REG_SC, buf + PCF8563_REG_SC);
|
2006-03-27 02:16:44 -07:00
|
|
|
}
|
|
|
|
|
2012-05-29 16:07:36 -06:00
|
|
|
static int pcf8563_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
|
|
|
|
{
|
2019-12-14 15:02:50 -07:00
|
|
|
struct i2c_client *client = to_i2c_client(dev);
|
2019-12-14 15:02:51 -07:00
|
|
|
int ret;
|
2012-05-29 16:07:36 -06:00
|
|
|
|
|
|
|
switch (cmd) {
|
|
|
|
case RTC_VL_READ:
|
2019-12-14 15:02:50 -07:00
|
|
|
ret = i2c_smbus_read_byte_data(client, PCF8563_REG_SC);
|
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
|
|
|
|
2019-12-14 15:02:51 -07:00
|
|
|
return put_user(ret & PCF8563_SC_LV ? RTC_VL_DATA_INVALID : 0,
|
|
|
|
(unsigned int __user *)arg);
|
2012-05-29 16:07:36 -06:00
|
|
|
default:
|
|
|
|
return -ENOIOCTLCMD;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2014-08-08 15:20:18 -06:00
|
|
|
static int pcf8563_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *tm)
|
|
|
|
{
|
|
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
|
|
unsigned char buf[4];
|
|
|
|
int err;
|
|
|
|
|
|
|
|
err = pcf8563_read_block_data(client, PCF8563_REG_AMN, 4, buf);
|
|
|
|
if (err)
|
|
|
|
return err;
|
|
|
|
|
|
|
|
dev_dbg(&client->dev,
|
|
|
|
"%s: raw data is min=%02x, hr=%02x, mday=%02x, wday=%02x\n",
|
|
|
|
__func__, buf[0], buf[1], buf[2], buf[3]);
|
|
|
|
|
2016-07-11 02:05:27 -06:00
|
|
|
tm->time.tm_sec = 0;
|
2014-08-08 15:20:18 -06:00
|
|
|
tm->time.tm_min = bcd2bin(buf[0] & 0x7F);
|
2014-12-10 16:53:37 -07:00
|
|
|
tm->time.tm_hour = bcd2bin(buf[1] & 0x3F);
|
|
|
|
tm->time.tm_mday = bcd2bin(buf[2] & 0x3F);
|
2014-08-08 15:20:18 -06:00
|
|
|
tm->time.tm_wday = bcd2bin(buf[3] & 0x7);
|
|
|
|
|
|
|
|
err = pcf8563_get_alarm_mode(client, &tm->enabled, &tm->pending);
|
|
|
|
if (err < 0)
|
|
|
|
return err;
|
|
|
|
|
|
|
|
dev_dbg(&client->dev, "%s: tm is mins=%d, hours=%d, mday=%d, wday=%d,"
|
|
|
|
" enabled=%d, pending=%d\n", __func__, tm->time.tm_min,
|
|
|
|
tm->time.tm_hour, tm->time.tm_mday, tm->time.tm_wday,
|
|
|
|
tm->enabled, tm->pending);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int pcf8563_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *tm)
|
|
|
|
{
|
|
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
|
|
unsigned char buf[4];
|
|
|
|
int err;
|
2014-12-10 16:53:40 -07:00
|
|
|
|
|
|
|
/* The alarm has no seconds, round up to nearest minute */
|
|
|
|
if (tm->time.tm_sec) {
|
2015-06-11 20:04:09 -06:00
|
|
|
time64_t alarm_time = rtc_tm_to_time64(&tm->time);
|
|
|
|
|
|
|
|
alarm_time += 60 - tm->time.tm_sec;
|
|
|
|
rtc_time64_to_tm(alarm_time, &tm->time);
|
2014-12-10 16:53:40 -07:00
|
|
|
}
|
2014-08-08 15:20:18 -06:00
|
|
|
|
|
|
|
dev_dbg(dev, "%s, min=%d hour=%d wday=%d mday=%d "
|
|
|
|
"enabled=%d pending=%d\n", __func__,
|
|
|
|
tm->time.tm_min, tm->time.tm_hour, tm->time.tm_wday,
|
|
|
|
tm->time.tm_mday, tm->enabled, tm->pending);
|
|
|
|
|
|
|
|
buf[0] = bin2bcd(tm->time.tm_min);
|
|
|
|
buf[1] = bin2bcd(tm->time.tm_hour);
|
|
|
|
buf[2] = bin2bcd(tm->time.tm_mday);
|
|
|
|
buf[3] = tm->time.tm_wday & 0x07;
|
|
|
|
|
|
|
|
err = pcf8563_write_block_data(client, PCF8563_REG_AMN, 4, buf);
|
|
|
|
if (err)
|
|
|
|
return err;
|
|
|
|
|
2017-11-07 21:27:45 -07:00
|
|
|
return pcf8563_set_alarm_mode(client, !!tm->enabled);
|
2014-08-08 15:20:18 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
static int pcf8563_irq_enable(struct device *dev, unsigned int enabled)
|
|
|
|
{
|
2014-12-10 16:53:46 -07:00
|
|
|
dev_dbg(dev, "%s: en=%d\n", __func__, enabled);
|
2014-08-08 15:20:18 -06:00
|
|
|
return pcf8563_set_alarm_mode(to_i2c_client(dev), !!enabled);
|
|
|
|
}
|
|
|
|
|
2015-10-16 05:31:29 -06:00
|
|
|
#ifdef CONFIG_COMMON_CLK
|
|
|
|
/*
|
|
|
|
* Handling of the clkout
|
|
|
|
*/
|
|
|
|
|
|
|
|
#define clkout_hw_to_pcf8563(_hw) container_of(_hw, struct pcf8563, clkout_hw)
|
|
|
|
|
2019-11-07 17:24:49 -07:00
|
|
|
static const int clkout_rates[] = {
|
2015-10-16 05:31:29 -06:00
|
|
|
32768,
|
|
|
|
1024,
|
|
|
|
32,
|
|
|
|
1,
|
|
|
|
};
|
|
|
|
|
|
|
|
static unsigned long pcf8563_clkout_recalc_rate(struct clk_hw *hw,
|
|
|
|
unsigned long parent_rate)
|
|
|
|
{
|
|
|
|
struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw);
|
|
|
|
struct i2c_client *client = pcf8563->client;
|
|
|
|
unsigned char buf;
|
|
|
|
int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf);
|
|
|
|
|
|
|
|
if (ret < 0)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
buf &= PCF8563_REG_CLKO_F_MASK;
|
2017-11-07 05:12:17 -07:00
|
|
|
return clkout_rates[buf];
|
2015-10-16 05:31:29 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
static long pcf8563_clkout_round_rate(struct clk_hw *hw, unsigned long rate,
|
|
|
|
unsigned long *prate)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
|
|
|
for (i = 0; i < ARRAY_SIZE(clkout_rates); i++)
|
|
|
|
if (clkout_rates[i] <= rate)
|
|
|
|
return clkout_rates[i];
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int pcf8563_clkout_set_rate(struct clk_hw *hw, unsigned long rate,
|
|
|
|
unsigned long parent_rate)
|
|
|
|
{
|
|
|
|
struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw);
|
|
|
|
struct i2c_client *client = pcf8563->client;
|
|
|
|
unsigned char buf;
|
|
|
|
int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf);
|
|
|
|
int i;
|
|
|
|
|
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
for (i = 0; i < ARRAY_SIZE(clkout_rates); i++)
|
|
|
|
if (clkout_rates[i] == rate) {
|
|
|
|
buf &= ~PCF8563_REG_CLKO_F_MASK;
|
|
|
|
buf |= i;
|
|
|
|
ret = pcf8563_write_block_data(client,
|
|
|
|
PCF8563_REG_CLKO, 1,
|
|
|
|
&buf);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int pcf8563_clkout_control(struct clk_hw *hw, bool enable)
|
|
|
|
{
|
|
|
|
struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw);
|
|
|
|
struct i2c_client *client = pcf8563->client;
|
|
|
|
unsigned char buf;
|
|
|
|
int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf);
|
|
|
|
|
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
if (enable)
|
|
|
|
buf |= PCF8563_REG_CLKO_FE;
|
|
|
|
else
|
|
|
|
buf &= ~PCF8563_REG_CLKO_FE;
|
|
|
|
|
|
|
|
ret = pcf8563_write_block_data(client, PCF8563_REG_CLKO, 1, &buf);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int pcf8563_clkout_prepare(struct clk_hw *hw)
|
|
|
|
{
|
|
|
|
return pcf8563_clkout_control(hw, 1);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void pcf8563_clkout_unprepare(struct clk_hw *hw)
|
|
|
|
{
|
|
|
|
pcf8563_clkout_control(hw, 0);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int pcf8563_clkout_is_prepared(struct clk_hw *hw)
|
|
|
|
{
|
|
|
|
struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw);
|
|
|
|
struct i2c_client *client = pcf8563->client;
|
|
|
|
unsigned char buf;
|
|
|
|
int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf);
|
|
|
|
|
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
return !!(buf & PCF8563_REG_CLKO_FE);
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct clk_ops pcf8563_clkout_ops = {
|
|
|
|
.prepare = pcf8563_clkout_prepare,
|
|
|
|
.unprepare = pcf8563_clkout_unprepare,
|
|
|
|
.is_prepared = pcf8563_clkout_is_prepared,
|
|
|
|
.recalc_rate = pcf8563_clkout_recalc_rate,
|
|
|
|
.round_rate = pcf8563_clkout_round_rate,
|
|
|
|
.set_rate = pcf8563_clkout_set_rate,
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct clk *pcf8563_clkout_register_clk(struct pcf8563 *pcf8563)
|
|
|
|
{
|
|
|
|
struct i2c_client *client = pcf8563->client;
|
|
|
|
struct device_node *node = client->dev.of_node;
|
|
|
|
struct clk *clk;
|
|
|
|
struct clk_init_data init;
|
|
|
|
int ret;
|
|
|
|
unsigned char buf;
|
|
|
|
|
|
|
|
/* disable the clkout output */
|
|
|
|
buf = 0;
|
|
|
|
ret = pcf8563_write_block_data(client, PCF8563_REG_CLKO, 1, &buf);
|
|
|
|
if (ret < 0)
|
|
|
|
return ERR_PTR(ret);
|
|
|
|
|
|
|
|
init.name = "pcf8563-clkout";
|
|
|
|
init.ops = &pcf8563_clkout_ops;
|
2016-04-19 19:12:19 -06:00
|
|
|
init.flags = 0;
|
2015-10-16 05:31:29 -06:00
|
|
|
init.parent_names = NULL;
|
|
|
|
init.num_parents = 0;
|
|
|
|
pcf8563->clkout_hw.init = &init;
|
|
|
|
|
|
|
|
/* optional override of the clockname */
|
|
|
|
of_property_read_string(node, "clock-output-names", &init.name);
|
|
|
|
|
|
|
|
/* register the clock */
|
|
|
|
clk = devm_clk_register(&client->dev, &pcf8563->clkout_hw);
|
|
|
|
|
|
|
|
if (!IS_ERR(clk))
|
|
|
|
of_clk_add_provider(node, of_clk_src_simple_get, clk);
|
|
|
|
|
|
|
|
return clk;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
2006-10-01 00:28:17 -06:00
|
|
|
static const struct rtc_class_ops pcf8563_rtc_ops = {
|
2012-05-29 16:07:36 -06:00
|
|
|
.ioctl = pcf8563_rtc_ioctl,
|
2006-03-27 02:16:44 -07:00
|
|
|
.read_time = pcf8563_rtc_read_time,
|
|
|
|
.set_time = pcf8563_rtc_set_time,
|
2014-08-08 15:20:18 -06:00
|
|
|
.read_alarm = pcf8563_rtc_read_alarm,
|
|
|
|
.set_alarm = pcf8563_rtc_set_alarm,
|
|
|
|
.alarm_irq_enable = pcf8563_irq_enable,
|
2006-03-27 02:16:44 -07:00
|
|
|
};
|
|
|
|
|
2008-04-29 15:11:39 -06:00
|
|
|
static int pcf8563_probe(struct i2c_client *client,
|
|
|
|
const struct i2c_device_id *id)
|
2006-03-27 02:16:44 -07:00
|
|
|
{
|
2007-02-08 15:20:24 -07:00
|
|
|
struct pcf8563 *pcf8563;
|
2014-08-08 15:20:18 -06:00
|
|
|
int err;
|
2014-12-10 16:53:43 -07:00
|
|
|
unsigned char buf;
|
2006-03-27 02:16:44 -07:00
|
|
|
|
2008-04-28 03:11:54 -06:00
|
|
|
dev_dbg(&client->dev, "%s\n", __func__);
|
2006-03-27 02:16:44 -07:00
|
|
|
|
2008-04-28 03:11:54 -06:00
|
|
|
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
|
|
|
|
return -ENODEV;
|
2006-03-27 02:16:44 -07:00
|
|
|
|
2013-04-29 17:20:49 -06:00
|
|
|
pcf8563 = devm_kzalloc(&client->dev, sizeof(struct pcf8563),
|
|
|
|
GFP_KERNEL);
|
2008-04-28 03:11:54 -06:00
|
|
|
if (!pcf8563)
|
|
|
|
return -ENOMEM;
|
2006-03-27 02:16:44 -07:00
|
|
|
|
2009-12-15 17:45:53 -07:00
|
|
|
i2c_set_clientdata(client, pcf8563);
|
2014-08-08 15:20:18 -06:00
|
|
|
pcf8563->client = client;
|
|
|
|
device_set_wakeup_capable(&client->dev, 1);
|
2009-12-15 17:45:53 -07:00
|
|
|
|
2014-12-10 16:53:43 -07:00
|
|
|
/* Set timer to lowest frequency to save power (ref Haoyu datasheet) */
|
|
|
|
buf = PCF8563_TMRC_1_60;
|
|
|
|
err = pcf8563_write_block_data(client, PCF8563_REG_TMRC, 1, &buf);
|
|
|
|
if (err < 0) {
|
|
|
|
dev_err(&client->dev, "%s: write error\n", __func__);
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
2019-06-03 22:23:36 -06:00
|
|
|
/* Clear flags and disable interrupts */
|
|
|
|
buf = 0;
|
|
|
|
err = pcf8563_write_block_data(client, PCF8563_REG_ST2, 1, &buf);
|
|
|
|
if (err < 0) {
|
|
|
|
dev_err(&client->dev, "%s: write error\n", __func__);
|
2014-12-10 16:53:46 -07:00
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
2019-08-29 15:25:45 -06:00
|
|
|
pcf8563->rtc = devm_rtc_allocate_device(&client->dev);
|
2014-08-08 15:20:18 -06:00
|
|
|
if (IS_ERR(pcf8563->rtc))
|
|
|
|
return PTR_ERR(pcf8563->rtc);
|
|
|
|
|
2019-08-29 15:25:45 -06:00
|
|
|
pcf8563->rtc->ops = &pcf8563_rtc_ops;
|
|
|
|
/* the pcf8563 alarm only supports a minute accuracy */
|
|
|
|
pcf8563->rtc->uie_unsupported = 1;
|
2019-08-29 15:25:47 -06:00
|
|
|
pcf8563->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
|
|
|
|
pcf8563->rtc->range_max = RTC_TIMESTAMP_END_2099;
|
|
|
|
pcf8563->rtc->set_start_time = true;
|
2019-08-29 15:25:45 -06:00
|
|
|
|
2014-08-08 15:20:18 -06:00
|
|
|
if (client->irq > 0) {
|
|
|
|
err = devm_request_threaded_irq(&client->dev, client->irq,
|
|
|
|
NULL, pcf8563_irq,
|
2019-06-03 22:23:35 -06:00
|
|
|
IRQF_SHARED | IRQF_ONESHOT | IRQF_TRIGGER_LOW,
|
2017-06-02 06:03:39 -06:00
|
|
|
pcf8563_driver.driver.name, client);
|
2014-08-08 15:20:18 -06:00
|
|
|
if (err) {
|
|
|
|
dev_err(&client->dev, "unable to request IRQ %d\n",
|
|
|
|
client->irq);
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2019-08-29 15:25:45 -06:00
|
|
|
err = rtc_register_device(pcf8563->rtc);
|
|
|
|
if (err)
|
|
|
|
return err;
|
|
|
|
|
2015-10-16 05:31:29 -06:00
|
|
|
#ifdef CONFIG_COMMON_CLK
|
|
|
|
/* register clk in common clk framework */
|
|
|
|
pcf8563_clkout_register_clk(pcf8563);
|
|
|
|
#endif
|
|
|
|
|
2014-08-08 15:20:18 -06:00
|
|
|
return 0;
|
2006-03-27 02:16:44 -07:00
|
|
|
}
|
|
|
|
|
2008-04-29 15:11:40 -06:00
|
|
|
static const struct i2c_device_id pcf8563_id[] = {
|
|
|
|
{ "pcf8563", 0 },
|
2008-07-12 14:47:56 -06:00
|
|
|
{ "rtc8564", 0 },
|
2008-04-29 15:11:40 -06:00
|
|
|
{ }
|
|
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(i2c, pcf8563_id);
|
|
|
|
|
2012-07-30 15:41:59 -06:00
|
|
|
#ifdef CONFIG_OF
|
2012-12-21 14:09:38 -07:00
|
|
|
static const struct of_device_id pcf8563_of_match[] = {
|
2012-07-30 15:41:59 -06:00
|
|
|
{ .compatible = "nxp,pcf8563" },
|
2019-08-29 15:25:43 -06:00
|
|
|
{ .compatible = "epson,rtc8564" },
|
2019-08-29 15:25:44 -06:00
|
|
|
{ .compatible = "microcrystal,rv8564" },
|
2012-07-30 15:41:59 -06:00
|
|
|
{}
|
|
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, pcf8563_of_match);
|
|
|
|
#endif
|
|
|
|
|
2008-04-28 03:11:54 -06:00
|
|
|
static struct i2c_driver pcf8563_driver = {
|
|
|
|
.driver = {
|
|
|
|
.name = "rtc-pcf8563",
|
2012-07-30 15:41:59 -06:00
|
|
|
.of_match_table = of_match_ptr(pcf8563_of_match),
|
2008-04-28 03:11:54 -06:00
|
|
|
},
|
|
|
|
.probe = pcf8563_probe,
|
2008-04-29 15:11:40 -06:00
|
|
|
.id_table = pcf8563_id,
|
2008-04-28 03:11:54 -06:00
|
|
|
};
|
|
|
|
|
2012-03-23 16:02:31 -06:00
|
|
|
module_i2c_driver(pcf8563_driver);
|
2006-03-27 02:16:44 -07:00
|
|
|
|
|
|
|
MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
|
|
|
|
MODULE_DESCRIPTION("Philips PCF8563/Epson RTC8564 RTC driver");
|
|
|
|
MODULE_LICENSE("GPL");
|