2005-08-11 13:27:50 +00:00
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/*
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* w1_ds2433.c - w1 family 23 (DS2433) driver
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*
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* Copyright (c) 2005 Ben Gardner <bgardner@wabtec.com>
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*
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2005-08-17 11:24:37 +00:00
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* This source code is licensed under the GNU General Public License,
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* Version 2. See the file COPYING for more details.
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2005-08-11 13:27:50 +00:00
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/device.h>
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#include <linux/types.h>
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#include <linux/delay.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 08:04:11 +00:00
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#include <linux/slab.h>
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2006-12-07 04:39:27 +00:00
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#ifdef CONFIG_W1_SLAVE_DS2433_CRC
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2005-08-17 11:24:37 +00:00
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#include <linux/crc16.h>
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2005-09-12 13:12:43 +00:00
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#define CRC16_INIT 0
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#define CRC16_VALID 0xb001
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2005-08-17 11:24:37 +00:00
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#endif
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2005-08-11 13:27:50 +00:00
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2005-12-06 10:38:28 +00:00
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#include "../w1.h"
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#include "../w1_int.h"
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#include "../w1_family.h"
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2005-08-11 13:27:50 +00:00
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Ben Gardner <bgardner@wabtec.com>");
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MODULE_DESCRIPTION("w1 family 23 driver for DS2433, 4kb EEPROM");
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2013-05-26 18:06:50 +00:00
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MODULE_ALIAS("w1-family-" __stringify(W1_EEPROM_DS2433));
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2005-08-11 13:27:50 +00:00
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#define W1_EEPROM_SIZE 512
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2005-08-17 11:24:37 +00:00
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#define W1_PAGE_COUNT 16
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2005-08-11 13:27:50 +00:00
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#define W1_PAGE_SIZE 32
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#define W1_PAGE_BITS 5
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#define W1_PAGE_MASK 0x1F
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2005-08-17 11:24:37 +00:00
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#define W1_F23_TIME 300
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2005-08-11 13:27:50 +00:00
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#define W1_F23_READ_EEPROM 0xF0
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#define W1_F23_WRITE_SCRATCH 0x0F
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#define W1_F23_READ_SCRATCH 0xAA
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#define W1_F23_COPY_SCRATCH 0x55
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2005-08-17 11:24:37 +00:00
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struct w1_f23_data {
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u8 memory[W1_EEPROM_SIZE];
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u32 validcrc;
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};
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2005-08-11 13:27:50 +00:00
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/**
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* Check the file size bounds and adjusts count as needed.
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2005-08-17 11:24:37 +00:00
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* This would not be needed if the file size didn't reset to 0 after a write.
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2005-08-11 13:27:50 +00:00
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*/
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static inline size_t w1_f23_fix_count(loff_t off, size_t count, size_t size)
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{
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if (off > size)
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return 0;
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if ((off + count) > size)
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return (size - off);
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return count;
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}
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2006-12-07 04:39:27 +00:00
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#ifdef CONFIG_W1_SLAVE_DS2433_CRC
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2005-08-17 11:24:37 +00:00
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static int w1_f23_refresh_block(struct w1_slave *sl, struct w1_f23_data *data,
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int block)
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{
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u8 wrbuf[3];
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int off = block * W1_PAGE_SIZE;
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if (data->validcrc & (1 << block))
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return 0;
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if (w1_reset_select_slave(sl)) {
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data->validcrc = 0;
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return -EIO;
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}
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wrbuf[0] = W1_F23_READ_EEPROM;
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wrbuf[1] = off & 0xff;
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wrbuf[2] = off >> 8;
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w1_write_block(sl->master, wrbuf, 3);
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w1_read_block(sl->master, &data->memory[off], W1_PAGE_SIZE);
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/* cache the block if the CRC is valid */
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if (crc16(CRC16_INIT, &data->memory[off], W1_PAGE_SIZE) == CRC16_VALID)
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data->validcrc |= (1 << block);
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return 0;
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}
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2006-12-07 04:39:27 +00:00
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#endif /* CONFIG_W1_SLAVE_DS2433_CRC */
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2005-08-17 11:24:37 +00:00
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2013-08-21 22:45:01 +00:00
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static ssize_t eeprom_read(struct file *filp, struct kobject *kobj,
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struct bin_attribute *bin_attr, char *buf,
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loff_t off, size_t count)
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2005-08-11 13:27:50 +00:00
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{
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struct w1_slave *sl = kobj_to_w1_slave(kobj);
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2006-12-07 04:39:27 +00:00
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#ifdef CONFIG_W1_SLAVE_DS2433_CRC
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2005-08-17 11:24:37 +00:00
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struct w1_f23_data *data = sl->family_data;
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int i, min_page, max_page;
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#else
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2005-08-11 13:27:50 +00:00
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u8 wrbuf[3];
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2005-08-17 11:24:37 +00:00
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#endif
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2005-08-11 13:27:50 +00:00
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if ((count = w1_f23_fix_count(off, count, W1_EEPROM_SIZE)) == 0)
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return 0;
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2012-05-18 05:59:52 +00:00
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mutex_lock(&sl->master->bus_mutex);
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2005-08-11 13:27:50 +00:00
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2006-12-07 04:39:27 +00:00
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#ifdef CONFIG_W1_SLAVE_DS2433_CRC
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2005-08-17 11:24:37 +00:00
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min_page = (off >> W1_PAGE_BITS);
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max_page = (off + count - 1) >> W1_PAGE_BITS;
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for (i = min_page; i <= max_page; i++) {
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if (w1_f23_refresh_block(sl, data, i)) {
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count = -EIO;
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goto out_up;
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}
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}
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memcpy(buf, &data->memory[off], count);
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2006-12-07 04:39:27 +00:00
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#else /* CONFIG_W1_SLAVE_DS2433_CRC */
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2005-08-17 11:24:37 +00:00
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2005-08-11 13:27:50 +00:00
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/* read directly from the EEPROM */
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if (w1_reset_select_slave(sl)) {
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count = -EIO;
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goto out_up;
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}
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wrbuf[0] = W1_F23_READ_EEPROM;
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wrbuf[1] = off & 0xff;
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wrbuf[2] = off >> 8;
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w1_write_block(sl->master, wrbuf, 3);
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w1_read_block(sl->master, buf, count);
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2006-12-07 04:39:27 +00:00
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#endif /* CONFIG_W1_SLAVE_DS2433_CRC */
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2005-08-17 11:24:37 +00:00
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2005-08-11 13:27:50 +00:00
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out_up:
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2012-05-18 05:59:52 +00:00
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mutex_unlock(&sl->master->bus_mutex);
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2005-08-11 13:27:50 +00:00
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return count;
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}
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/**
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* Writes to the scratchpad and reads it back for verification.
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2005-08-17 11:24:37 +00:00
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* Then copies the scratchpad to EEPROM.
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* The data must be on one page.
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2005-08-11 13:27:50 +00:00
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* The master must be locked.
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*
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* @param sl The slave structure
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* @param addr Address for the write
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* @param len length must be <= (W1_PAGE_SIZE - (addr & W1_PAGE_MASK))
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* @param data The data to write
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* @return 0=Success -1=failure
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*/
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static int w1_f23_write(struct w1_slave *sl, int addr, int len, const u8 *data)
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{
|
2009-02-27 22:02:58 +00:00
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#ifdef CONFIG_W1_SLAVE_DS2433_CRC
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struct w1_f23_data *f23 = sl->family_data;
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#endif
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2005-08-11 13:27:50 +00:00
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u8 wrbuf[4];
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u8 rdbuf[W1_PAGE_SIZE + 3];
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u8 es = (addr + len - 1) & 0x1f;
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/* Write the data to the scratchpad */
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if (w1_reset_select_slave(sl))
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return -1;
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wrbuf[0] = W1_F23_WRITE_SCRATCH;
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wrbuf[1] = addr & 0xff;
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wrbuf[2] = addr >> 8;
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w1_write_block(sl->master, wrbuf, 3);
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w1_write_block(sl->master, data, len);
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/* Read the scratchpad and verify */
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if (w1_reset_select_slave(sl))
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return -1;
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w1_write_8(sl->master, W1_F23_READ_SCRATCH);
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w1_read_block(sl->master, rdbuf, len + 3);
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/* Compare what was read against the data written */
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if ((rdbuf[0] != wrbuf[1]) || (rdbuf[1] != wrbuf[2]) ||
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(rdbuf[2] != es) || (memcmp(data, &rdbuf[3], len) != 0))
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return -1;
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/* Copy the scratchpad to EEPROM */
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|
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if (w1_reset_select_slave(sl))
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return -1;
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|
|
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wrbuf[0] = W1_F23_COPY_SCRATCH;
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wrbuf[3] = es;
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w1_write_block(sl->master, wrbuf, 4);
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/* Sleep for 5 ms to wait for the write to complete */
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msleep(5);
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|
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/* Reset the bus to wake up the EEPROM (this may not be needed) */
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|
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w1_reset_bus(sl->master);
|
2009-02-27 22:02:58 +00:00
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#ifdef CONFIG_W1_SLAVE_DS2433_CRC
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f23->validcrc &= ~(1 << (addr >> W1_PAGE_BITS));
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#endif
|
2005-08-11 13:27:50 +00:00
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return 0;
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}
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|
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|
2013-08-21 22:45:01 +00:00
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|
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static ssize_t eeprom_write(struct file *filp, struct kobject *kobj,
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struct bin_attribute *bin_attr, char *buf,
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loff_t off, size_t count)
|
2005-08-11 13:27:50 +00:00
|
|
|
{
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|
|
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struct w1_slave *sl = kobj_to_w1_slave(kobj);
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|
|
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int addr, len, idx;
|
|
|
|
|
|
|
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if ((count = w1_f23_fix_count(off, count, W1_EEPROM_SIZE)) == 0)
|
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|
return 0;
|
|
|
|
|
2006-12-07 04:39:27 +00:00
|
|
|
#ifdef CONFIG_W1_SLAVE_DS2433_CRC
|
2005-08-17 11:24:37 +00:00
|
|
|
/* can only write full blocks in cached mode */
|
|
|
|
if ((off & W1_PAGE_MASK) || (count & W1_PAGE_MASK)) {
|
2005-09-12 13:12:43 +00:00
|
|
|
dev_err(&sl->dev, "invalid offset/count off=%d cnt=%zd\n",
|
2005-08-17 11:24:37 +00:00
|
|
|
(int)off, count);
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|
|
return -EINVAL;
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|
|
|
}
|
|
|
|
|
|
|
|
/* make sure the block CRCs are valid */
|
|
|
|
for (idx = 0; idx < count; idx += W1_PAGE_SIZE) {
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|
|
|
if (crc16(CRC16_INIT, &buf[idx], W1_PAGE_SIZE) != CRC16_VALID) {
|
|
|
|
dev_err(&sl->dev, "bad CRC at offset %d\n", (int)off);
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|
|
|
return -EINVAL;
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|
|
|
}
|
|
|
|
}
|
2006-12-07 04:39:27 +00:00
|
|
|
#endif /* CONFIG_W1_SLAVE_DS2433_CRC */
|
2005-08-17 11:24:37 +00:00
|
|
|
|
2012-05-18 05:59:52 +00:00
|
|
|
mutex_lock(&sl->master->bus_mutex);
|
2005-08-11 13:27:50 +00:00
|
|
|
|
|
|
|
/* Can only write data to one page at a time */
|
|
|
|
idx = 0;
|
|
|
|
while (idx < count) {
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|
|
|
addr = off + idx;
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|
|
len = W1_PAGE_SIZE - (addr & W1_PAGE_MASK);
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if (len > (count - idx))
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len = count - idx;
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|
|
|
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|
|
if (w1_f23_write(sl, addr, len, &buf[idx]) < 0) {
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|
|
count = -EIO;
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|
|
goto out_up;
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|
|
|
}
|
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|
|
idx += len;
|
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|
}
|
|
|
|
|
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|
out_up:
|
2012-05-18 05:59:52 +00:00
|
|
|
mutex_unlock(&sl->master->bus_mutex);
|
2005-08-11 13:27:50 +00:00
|
|
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|
return count;
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|
|
}
|
|
|
|
|
2013-08-21 22:45:01 +00:00
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|
|
static BIN_ATTR_RW(eeprom, W1_EEPROM_SIZE);
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|
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|
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|
|
static struct bin_attribute *w1_f23_bin_attributes[] = {
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|
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&bin_attr_eeprom,
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|
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NULL,
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|
|
};
|
|
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|
|
static const struct attribute_group w1_f23_group = {
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|
|
.bin_attrs = w1_f23_bin_attributes,
|
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|
|
};
|
|
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|
|
static const struct attribute_group *w1_f23_groups[] = {
|
|
|
|
&w1_f23_group,
|
|
|
|
NULL,
|
2005-08-11 13:27:50 +00:00
|
|
|
};
|
|
|
|
|
|
|
|
static int w1_f23_add_slave(struct w1_slave *sl)
|
|
|
|
{
|
2006-12-07 04:39:27 +00:00
|
|
|
#ifdef CONFIG_W1_SLAVE_DS2433_CRC
|
2005-08-17 11:24:37 +00:00
|
|
|
struct w1_f23_data *data;
|
|
|
|
|
some kmalloc/memset ->kzalloc (tree wide)
Transform some calls to kmalloc/memset to a single kzalloc (or kcalloc).
Here is a short excerpt of the semantic patch performing
this transformation:
@@
type T2;
expression x;
identifier f,fld;
expression E;
expression E1,E2;
expression e1,e2,e3,y;
statement S;
@@
x =
- kmalloc
+ kzalloc
(E1,E2)
... when != \(x->fld=E;\|y=f(...,x,...);\|f(...,x,...);\|x=E;\|while(...) S\|for(e1;e2;e3) S\)
- memset((T2)x,0,E1);
@@
expression E1,E2,E3;
@@
- kzalloc(E1 * E2,E3)
+ kcalloc(E1,E2,E3)
[akpm@linux-foundation.org: get kcalloc args the right way around]
Signed-off-by: Yoann Padioleau <padator@wanadoo.fr>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Acked-by: Russell King <rmk@arm.linux.org.uk>
Cc: Bryan Wu <bryan.wu@analog.com>
Acked-by: Jiri Slaby <jirislaby@gmail.com>
Cc: Dave Airlie <airlied@linux.ie>
Acked-by: Roland Dreier <rolandd@cisco.com>
Cc: Jiri Kosina <jkosina@suse.cz>
Acked-by: Dmitry Torokhov <dtor@mail.ru>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Acked-by: Pierre Ossman <drzeus-list@drzeus.cx>
Cc: Jeff Garzik <jeff@garzik.org>
Cc: "David S. Miller" <davem@davemloft.net>
Acked-by: Greg KH <greg@kroah.com>
Cc: James Bottomley <James.Bottomley@steeleye.com>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-07-19 08:49:03 +00:00
|
|
|
data = kzalloc(sizeof(struct w1_f23_data), GFP_KERNEL);
|
2005-08-17 11:24:37 +00:00
|
|
|
if (!data)
|
|
|
|
return -ENOMEM;
|
|
|
|
sl->family_data = data;
|
|
|
|
|
2006-12-07 04:39:27 +00:00
|
|
|
#endif /* CONFIG_W1_SLAVE_DS2433_CRC */
|
2013-08-21 22:45:01 +00:00
|
|
|
return 0;
|
2005-08-11 13:27:50 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static void w1_f23_remove_slave(struct w1_slave *sl)
|
|
|
|
{
|
2006-12-07 04:39:27 +00:00
|
|
|
#ifdef CONFIG_W1_SLAVE_DS2433_CRC
|
2005-11-07 09:01:32 +00:00
|
|
|
kfree(sl->family_data);
|
|
|
|
sl->family_data = NULL;
|
2006-12-07 04:39:27 +00:00
|
|
|
#endif /* CONFIG_W1_SLAVE_DS2433_CRC */
|
2005-08-11 13:27:50 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static struct w1_family_ops w1_f23_fops = {
|
|
|
|
.add_slave = w1_f23_add_slave,
|
|
|
|
.remove_slave = w1_f23_remove_slave,
|
2013-08-21 22:45:01 +00:00
|
|
|
.groups = w1_f23_groups,
|
2005-08-11 13:27:50 +00:00
|
|
|
};
|
|
|
|
|
|
|
|
static struct w1_family w1_family_23 = {
|
|
|
|
.fid = W1_EEPROM_DS2433,
|
|
|
|
.fops = &w1_f23_fops,
|
|
|
|
};
|
|
|
|
|
|
|
|
static int __init w1_f23_init(void)
|
|
|
|
{
|
|
|
|
return w1_register_family(&w1_family_23);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit w1_f23_fini(void)
|
|
|
|
{
|
|
|
|
w1_unregister_family(&w1_family_23);
|
|
|
|
}
|
|
|
|
|
|
|
|
module_init(w1_f23_init);
|
|
|
|
module_exit(w1_f23_fini);
|