From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/drivers/w1/slaves/w1_ds2406.c | 168 +++++++++++++++++++++++++++++++++++ 1 file changed, 168 insertions(+) create mode 100644 kernel/drivers/w1/slaves/w1_ds2406.c (limited to 'kernel/drivers/w1/slaves/w1_ds2406.c') diff --git a/kernel/drivers/w1/slaves/w1_ds2406.c b/kernel/drivers/w1/slaves/w1_ds2406.c new file mode 100644 index 000000000..d488961a8 --- /dev/null +++ b/kernel/drivers/w1/slaves/w1_ds2406.c @@ -0,0 +1,168 @@ +/* + * w1_ds2406.c - w1 family 12 (DS2406) driver + * based on w1_ds2413.c by Mariusz Bialonczyk + * + * Copyright (c) 2014 Scott Alfter + * + * This source code is licensed under the GNU General Public License, + * Version 2. See the file COPYING for more details. + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include "../w1.h" +#include "../w1_int.h" +#include "../w1_family.h" + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Scott Alfter "); +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; +} + +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; +} + +#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; +} + +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])); +} + +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, +}; + +static int __init w1_f12_init(void) +{ + return w1_register_family(&w1_family_12); +} + +static void __exit w1_f12_exit(void) +{ + w1_unregister_family(&w1_family_12); +} + +module_init(w1_f12_init); +module_exit(w1_f12_exit); -- cgit 1.2.3-korg