mirror of https://gitee.com/openkylin/linux.git
119 lines
3.0 KiB
C
119 lines
3.0 KiB
C
/*
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* w1_smem.c
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*
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* Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the smems of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <asm/types.h>
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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 "w1.h"
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#include "w1_io.h"
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#include "w1_int.h"
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#include "w1_family.h"
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>");
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MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol, 64bit memory family.");
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static ssize_t w1_smem_read_name(struct device *, char *);
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static ssize_t w1_smem_read_val(struct device *, char *);
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static ssize_t w1_smem_read_bin(struct kobject *, char *, loff_t, size_t);
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static struct w1_family_ops w1_smem_fops = {
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.rname = &w1_smem_read_name,
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.rbin = &w1_smem_read_bin,
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.rval = &w1_smem_read_val,
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.rvalname = "id",
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};
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static ssize_t w1_smem_read_name(struct device *dev, char *buf)
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{
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struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
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return sprintf(buf, "%s\n", sl->name);
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}
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static ssize_t w1_smem_read_val(struct device *dev, char *buf)
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{
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struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
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int i;
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ssize_t count = 0;
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for (i = 0; i < 9; ++i)
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count += sprintf(buf + count, "%02x ", ((u8 *)&sl->reg_num)[i]);
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count += sprintf(buf + count, "\n");
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return count;
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}
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static ssize_t w1_smem_read_bin(struct kobject *kobj, char *buf, loff_t off, size_t count)
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{
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struct w1_slave *sl = container_of(container_of(kobj, struct device, kobj),
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struct w1_slave, dev);
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int i;
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atomic_inc(&sl->refcnt);
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if (down_interruptible(&sl->master->mutex)) {
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count = 0;
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goto out_dec;
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}
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if (off > W1_SLAVE_DATA_SIZE) {
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count = 0;
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goto out;
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}
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if (off + count > W1_SLAVE_DATA_SIZE) {
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count = 0;
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goto out;
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}
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for (i = 0; i < 9; ++i)
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count += sprintf(buf + count, "%02x ", ((u8 *)&sl->reg_num)[i]);
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count += sprintf(buf + count, "\n");
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out:
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up(&sl->master->mutex);
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out_dec:
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atomic_dec(&sl->refcnt);
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return count;
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}
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static struct w1_family w1_smem_family = {
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.fid = W1_FAMILY_SMEM,
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.fops = &w1_smem_fops,
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};
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static int __init w1_smem_init(void)
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{
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return w1_register_family(&w1_smem_family);
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}
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static void __exit w1_smem_fini(void)
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{
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w1_unregister_family(&w1_smem_family);
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}
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module_init(w1_smem_init);
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module_exit(w1_smem_fini);
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