linux_dsm_epyc7002/drivers/w1/slaves/w1_therm.c
Zhang Rui 91a6902958 sysfs: add parameter "struct bin_attribute *" in .read/.write methods for sysfs binary attributes
Well, first of all, I don't want to change so many files either.

What I do:
Adding a new parameter "struct bin_attribute *" in the
.read/.write methods for the sysfs binary attributes.

In fact, only the four lines change in fs/sysfs/bin.c and
include/linux/sysfs.h do the real work.
But I have to update all the files that use binary attributes
to make them compatible with the new .read and .write methods.
I'm not sure if I missed any. :(

Why I do this:
For a sysfs attribute, we can get a pointer pointing to the
struct attribute in the .show/.store method,
while we can't do this for the binary attributes.
I don't know why this is different, but this does make it not
so handy to use the binary attributes as the regular ones.
So I think this patch is reasonable. :)

Who benefits from it:
The patch that exposes ACPI tables in sysfs
requires such an improvement.
All the table binary attributes share the same .read method.
Parameter "struct bin_attribute *" is used to get
the table signature and instance number which are used to
distinguish different ACPI table binary attributes.

Without this parameter, we need to offer different .read methods
for different ACPI table binary attributes.
This is impossible as there are various ACPI tables on different
platforms, and we don't know what they are until they are loaded.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2007-07-11 16:09:09 -07:00

259 lines
5.5 KiB
C

/*
* w1_therm.c
*
* Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru>
*
*
* This program is free software; you can redistribute it and/or modify
* it under the therms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <asm/types.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/sched.h>
#include <linux/device.h>
#include <linux/types.h>
#include <linux/delay.h>
#include "../w1.h"
#include "../w1_int.h"
#include "../w1_family.h"
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>");
MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol, temperature family.");
static u8 bad_roms[][9] = {
{0xaa, 0x00, 0x4b, 0x46, 0xff, 0xff, 0x0c, 0x10, 0x87},
{}
};
static ssize_t w1_therm_read_bin(struct kobject *, struct bin_attribute *,
char *, loff_t, size_t);
static struct bin_attribute w1_therm_bin_attr = {
.attr = {
.name = "w1_slave",
.mode = S_IRUGO,
},
.size = W1_SLAVE_DATA_SIZE,
.read = w1_therm_read_bin,
};
static int w1_therm_add_slave(struct w1_slave *sl)
{
return sysfs_create_bin_file(&sl->dev.kobj, &w1_therm_bin_attr);
}
static void w1_therm_remove_slave(struct w1_slave *sl)
{
sysfs_remove_bin_file(&sl->dev.kobj, &w1_therm_bin_attr);
}
static struct w1_family_ops w1_therm_fops = {
.add_slave = w1_therm_add_slave,
.remove_slave = w1_therm_remove_slave,
};
static struct w1_family w1_therm_family_DS18S20 = {
.fid = W1_THERM_DS18S20,
.fops = &w1_therm_fops,
};
static struct w1_family w1_therm_family_DS18B20 = {
.fid = W1_THERM_DS18B20,
.fops = &w1_therm_fops,
};
static struct w1_family w1_therm_family_DS1822 = {
.fid = W1_THERM_DS1822,
.fops = &w1_therm_fops,
};
struct w1_therm_family_converter
{
u8 broken;
u16 reserved;
struct w1_family *f;
int (*convert)(u8 rom[9]);
};
static inline int w1_DS18B20_convert_temp(u8 rom[9]);
static inline int w1_DS18S20_convert_temp(u8 rom[9]);
static struct w1_therm_family_converter w1_therm_families[] = {
{
.f = &w1_therm_family_DS18S20,
.convert = w1_DS18S20_convert_temp
},
{
.f = &w1_therm_family_DS1822,
.convert = w1_DS18B20_convert_temp
},
{
.f = &w1_therm_family_DS18B20,
.convert = w1_DS18B20_convert_temp
},
};
static inline int w1_DS18B20_convert_temp(u8 rom[9])
{
int t = (rom[1] << 8) | rom[0];
t /= 16;
return t;
}
static inline int w1_DS18S20_convert_temp(u8 rom[9])
{
int t, h;
if (!rom[7])
return 0;
if (rom[1] == 0)
t = ((s32)rom[0] >> 1)*1000;
else
t = 1000*(-1*(s32)(0x100-rom[0]) >> 1);
t -= 250;
h = 1000*((s32)rom[7] - (s32)rom[6]);
h /= (s32)rom[7];
t += h;
return t;
}
static inline int w1_convert_temp(u8 rom[9], u8 fid)
{
int i;
for (i = 0; i < ARRAY_SIZE(w1_therm_families); ++i)
if (w1_therm_families[i].f->fid == fid)
return w1_therm_families[i].convert(rom);
return 0;
}
static int w1_therm_check_rom(u8 rom[9])
{
int i;
for (i=0; i<sizeof(bad_roms)/9; ++i)
if (!memcmp(bad_roms[i], rom, 9))
return 1;
return 0;
}
static ssize_t w1_therm_read_bin(struct kobject *kobj,
struct bin_attribute *bin_attr,
char *buf, loff_t off, size_t count)
{
struct w1_slave *sl = kobj_to_w1_slave(kobj);
struct w1_master *dev = sl->master;
u8 rom[9], crc, verdict;
int i, max_trying = 10;
mutex_lock(&sl->master->mutex);
if (off > W1_SLAVE_DATA_SIZE) {
count = 0;
goto out;
}
if (off + count > W1_SLAVE_DATA_SIZE) {
count = 0;
goto out;
}
memset(buf, 0, count);
memset(rom, 0, sizeof(rom));
count = 0;
verdict = 0;
crc = 0;
while (max_trying--) {
if (!w1_reset_select_slave(sl)) {
int count = 0;
unsigned int tm = 750;
w1_write_8(dev, W1_CONVERT_TEMP);
msleep(tm);
if (!w1_reset_select_slave(sl)) {
w1_write_8(dev, W1_READ_SCRATCHPAD);
if ((count = w1_read_block(dev, rom, 9)) != 9) {
dev_warn(&dev->dev, "w1_read_block() returned %d instead of 9.\n", count);
}
crc = w1_calc_crc8(rom, 8);
if (rom[8] == crc && rom[0])
verdict = 1;
}
}
if (!w1_therm_check_rom(rom))
break;
}
for (i = 0; i < 9; ++i)
count += sprintf(buf + count, "%02x ", rom[i]);
count += sprintf(buf + count, ": crc=%02x %s\n",
crc, (verdict) ? "YES" : "NO");
if (verdict)
memcpy(sl->rom, rom, sizeof(sl->rom));
else
dev_warn(&dev->dev, "18S20 doesn't respond to CONVERT_TEMP.\n");
for (i = 0; i < 9; ++i)
count += sprintf(buf + count, "%02x ", sl->rom[i]);
count += sprintf(buf + count, "t=%d\n", w1_convert_temp(rom, sl->family->fid));
out:
mutex_unlock(&dev->mutex);
return count;
}
static int __init w1_therm_init(void)
{
int err, i;
for (i = 0; i < ARRAY_SIZE(w1_therm_families); ++i) {
err = w1_register_family(w1_therm_families[i].f);
if (err)
w1_therm_families[i].broken = 1;
}
return 0;
}
static void __exit w1_therm_fini(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(w1_therm_families); ++i)
if (!w1_therm_families[i].broken)
w1_unregister_family(w1_therm_families[i].f);
}
module_init(w1_therm_init);
module_exit(w1_therm_fini);