cregit-Linux how code gets into the kernel

Release 4.11 drivers/w1/slaves/w1_ds2406.c

/*
 * w1_ds2406.c - w1 family 12 (DS2406) driver
 * based on w1_ds2413.c by Mariusz Bialonczyk <manio@skyboo.net>
 *
 * Copyright (c) 2014 Scott Alfter <scott@alfter.us>
 *
 * This source code is licensed under the GNU General Public License,
 * Version 2. See the file COPYING for more details.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/device.h>
#include <linux/types.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/crc16.h>

#include "../w1.h"
#include "../w1_int.h"
#include "../w1_family.h"

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Scott Alfter <scott@alfter.us>");
MODULE_DESCRIPTION("w1 family 12 driver for DS2406 2 Pin IO");


#define W1_F12_FUNC_READ_STATUS		   0xAA

#define W1_F12_FUNC_WRITE_STATUS	   0x55


static ssize_t w1_f12_read_state( struct file *filp, struct kobject *kobj, struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count) { u8 w1_buf[6]={W1_F12_FUNC_READ_STATUS, 7, 0, 0, 0, 0}; struct w1_slave *sl = kobj_to_w1_slave(kobj); u16 crc=0; int i; ssize_t rtnval=1; if (off != 0) return 0; if (!buf) return -EINVAL; mutex_lock(&sl->master->bus_mutex); if (w1_reset_select_slave(sl)) { mutex_unlock(&sl->master->bus_mutex); return -EIO; } w1_write_block(sl->master, w1_buf, 3); w1_read_block(sl->master, w1_buf+3, 3); for (i=0; i<6; i++) crc=crc16_byte(crc, w1_buf[i]); if (crc==0xb001) /* good read? */ *buf=((w1_buf[3]>>5)&3)|0x30; else rtnval=-EIO; mutex_unlock(&sl->master->bus_mutex); return rtnval; }

Contributors

PersonTokensPropCommitsCommitProp
Scott Alfter218100.00%1100.00%
Total218100.00%1100.00%


static ssize_t w1_f12_write_output( struct file *filp, 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); u8 w1_buf[6]={W1_F12_FUNC_WRITE_STATUS, 7, 0, 0, 0, 0}; u16 crc=0; int i; ssize_t rtnval=1; if (count != 1 || off != 0) return -EFAULT; mutex_lock(&sl->master->bus_mutex); if (w1_reset_select_slave(sl)) { mutex_unlock(&sl->master->bus_mutex); return -EIO; } w1_buf[3] = (((*buf)&3)<<5)|0x1F; w1_write_block(sl->master, w1_buf, 4); w1_read_block(sl->master, w1_buf+4, 2); for (i=0; i<6; i++) crc=crc16_byte(crc, w1_buf[i]); if (crc==0xb001) /* good read? */ w1_write_8(sl->master, 0xFF); else rtnval=-EIO; mutex_unlock(&sl->master->bus_mutex); return rtnval; }

Contributors

PersonTokensPropCommitsCommitProp
Scott Alfter225100.00%1100.00%
Total225100.00%1100.00%

#define NB_SYSFS_BIN_FILES 2 static struct bin_attribute w1_f12_sysfs_bin_files[NB_SYSFS_BIN_FILES] = { { .attr = { .name = "state", .mode = S_IRUGO, }, .size = 1, .read = w1_f12_read_state, }, { .attr = { .name = "output", .mode = S_IRUGO | S_IWUSR | S_IWGRP, }, .size = 1, .write = w1_f12_write_output, } };
static int w1_f12_add_slave(struct w1_slave *sl) { int err = 0; int i; for (i = 0; i < NB_SYSFS_BIN_FILES && !err; ++i) err = sysfs_create_bin_file( &sl->dev.kobj, &(w1_f12_sysfs_bin_files[i])); if (err) while (--i >= 0) sysfs_remove_bin_file(&sl->dev.kobj, &(w1_f12_sysfs_bin_files[i])); return err; }

Contributors

PersonTokensPropCommitsCommitProp
Scott Alfter87100.00%1100.00%
Total87100.00%1100.00%


static void w1_f12_remove_slave(struct w1_slave *sl) { int i; for (i = NB_SYSFS_BIN_FILES - 1; i >= 0; --i) sysfs_remove_bin_file(&sl->dev.kobj, &(w1_f12_sysfs_bin_files[i])); }

Contributors

PersonTokensPropCommitsCommitProp
Scott Alfter47100.00%1100.00%
Total47100.00%1100.00%

static struct w1_family_ops w1_f12_fops = { .add_slave = w1_f12_add_slave, .remove_slave = w1_f12_remove_slave, }; static struct w1_family w1_family_12 = { .fid = W1_FAMILY_DS2406, .fops = &w1_f12_fops, }; module_w1_family(w1_family_12);

Overall Contributors

PersonTokensPropCommitsCommitProp
Scott Alfter74499.73%150.00%
Andrew F. Davis20.27%150.00%
Total746100.00%2100.00%
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.