mirror of https://gitee.com/openkylin/linux.git
w1: format for DocBook and fixes
Switch the code documentation format style to DocBook format, enable DocBook documentation generation, and fix some comments. Signed-off-by: David Fries <David@Fries.net> Acked-by: Evgeniy Polyakov <zbr@ioremap.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
David Fries
Greg Kroah-Hartman
parent
eb2c0da4ac
commit
b3be177a19
|
|
@ -14,7 +14,7 @@ DOCBOOKS := z8530book.xml device-drivers.xml \
|
|||
genericirq.xml s390-drivers.xml uio-howto.xml scsi.xml \
|
||||
80211.xml debugobjects.xml sh.xml regulator.xml \
|
||||
alsa-driver-api.xml writing-an-alsa-driver.xml \
|
||||
tracepoint.xml drm.xml media_api.xml
|
||||
tracepoint.xml drm.xml media_api.xml w1.xml
|
||||
|
||||
include $(srctree)/Documentation/DocBook/media/Makefile
|
||||
|
||||
|
|
|
|||
|
|
@ -0,0 +1,101 @@
|
|||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
|
||||
"http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd" []>
|
||||
|
||||
<book id="w1id">
|
||||
<bookinfo>
|
||||
<title>W1: Dallas' 1-wire bus</title>
|
||||
|
||||
<authorgroup>
|
||||
<author>
|
||||
<firstname>David</firstname>
|
||||
<surname>Fries</surname>
|
||||
<affiliation>
|
||||
<address>
|
||||
<email>David@Fries.net</email>
|
||||
</address>
|
||||
</affiliation>
|
||||
</author>
|
||||
|
||||
</authorgroup>
|
||||
|
||||
<copyright>
|
||||
<year>2013</year>
|
||||
<!--
|
||||
<holder></holder>
|
||||
-->
|
||||
</copyright>
|
||||
|
||||
<legalnotice>
|
||||
<para>
|
||||
This documentation is free software; you can redistribute
|
||||
it and/or modify it under the terms of the GNU General Public
|
||||
License version 2.
|
||||
</para>
|
||||
|
||||
<para>
|
||||
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.
|
||||
For more details see the file COPYING in the source
|
||||
distribution of Linux.
|
||||
</para>
|
||||
</legalnotice>
|
||||
</bookinfo>
|
||||
|
||||
<toc></toc>
|
||||
|
||||
<chapter id="w1_internal">
|
||||
<title>W1 API internal to the kernel</title>
|
||||
|
||||
<sect1 id="w1_internal_api">
|
||||
<title>W1 API internal to the kernel</title>
|
||||
<sect2 id="w1.h">
|
||||
<title>drivers/w1/w1.h</title>
|
||||
<para>W1 core functions.</para>
|
||||
!Idrivers/w1/w1.h
|
||||
</sect2>
|
||||
|
||||
<sect2 id="w1.c">
|
||||
<title>drivers/w1/w1.c</title>
|
||||
<para>W1 core functions.</para>
|
||||
!Idrivers/w1/w1.c
|
||||
</sect2>
|
||||
|
||||
<sect2 id="w1_family.h">
|
||||
<title>drivers/w1/w1_family.h</title>
|
||||
<para>Allows registering device family operations.</para>
|
||||
!Idrivers/w1/w1_family.h
|
||||
</sect2>
|
||||
|
||||
<sect2 id="w1_family.c">
|
||||
<title>drivers/w1/w1_family.c</title>
|
||||
<para>Allows registering device family operations.</para>
|
||||
!Edrivers/w1/w1_family.c
|
||||
</sect2>
|
||||
|
||||
<sect2 id="w1_int.c">
|
||||
<title>drivers/w1/w1_int.c</title>
|
||||
<para>W1 internal initialization for master devices.</para>
|
||||
!Edrivers/w1/w1_int.c
|
||||
</sect2>
|
||||
|
||||
<sect2 id="w1_netlink.h">
|
||||
<title>drivers/w1/w1_netlink.h</title>
|
||||
<para>W1 external netlink API structures and commands.</para>
|
||||
!Idrivers/w1/w1_netlink.h
|
||||
</sect2>
|
||||
|
||||
<sect2 id="w1_io.c">
|
||||
<title>drivers/w1/w1_io.c</title>
|
||||
<para>W1 input/output.</para>
|
||||
!Edrivers/w1/w1_io.c
|
||||
!Idrivers/w1/w1_io.c
|
||||
</sect2>
|
||||
|
||||
</sect1>
|
||||
|
||||
|
||||
</chapter>
|
||||
|
||||
</book>
|
||||
|
|
@ -5,8 +5,8 @@ Message types.
|
|||
=============
|
||||
|
||||
There are three types of messages between w1 core and userspace:
|
||||
1. Events. They are generated each time new master or slave device
|
||||
found either due to automatic or requested search.
|
||||
1. Events. They are generated each time a new master or slave device
|
||||
is found either due to automatic or requested search.
|
||||
2. Userspace commands.
|
||||
3. Replies to userspace commands.
|
||||
|
||||
|
|
@ -131,7 +131,7 @@ of the w1_netlink_cmd structure and cn_msg.len will be equal to the sum
|
|||
of the sizeof(struct w1_netlink_msg) and sizeof(struct w1_netlink_cmd).
|
||||
If reply is generated for master or root command (which do not have
|
||||
w1_netlink_cmd attached), reply will contain only cn_msg and w1_netlink_msg
|
||||
structires.
|
||||
structures.
|
||||
|
||||
w1_netlink_msg.status field will carry positive error value
|
||||
(EINVAL for example) or zero in case of success.
|
||||
|
|
@ -160,7 +160,7 @@ procedure is started to select given device.
|
|||
Then all requested in w1_netlink_msg operations are performed one by one.
|
||||
If command requires reply (like read command) it is sent on command completion.
|
||||
|
||||
When all commands (w1_netlink_cmd) are processed muster device is unlocked
|
||||
When all commands (w1_netlink_cmd) are processed master device is unlocked
|
||||
and next w1_netlink_msg header processing started.
|
||||
|
||||
|
||||
|
|
|
|||
|
|
@ -50,8 +50,21 @@ int w1_max_slave_count = 64;
|
|||
int w1_max_slave_ttl = 10;
|
||||
|
||||
module_param_named(timeout, w1_timeout, int, 0);
|
||||
MODULE_PARM_DESC(timeout, "time in seconds between automatic slave searches");
|
||||
/* A search stops when w1_max_slave_count devices have been found in that
|
||||
* search. The next search will start over and detect the same set of devices
|
||||
* on a static 1-wire bus. Memory is not allocated based on this number, just
|
||||
* on the number of devices known to the kernel. Having a high number does not
|
||||
* consume additional resources. As a special case, if there is only one
|
||||
* device on the network and w1_max_slave_count is set to 1, the device id can
|
||||
* be read directly skipping the normal slower search process.
|
||||
*/
|
||||
module_param_named(max_slave_count, w1_max_slave_count, int, 0);
|
||||
MODULE_PARM_DESC(max_slave_count,
|
||||
"maximum number of slaves detected in a search");
|
||||
module_param_named(slave_ttl, w1_max_slave_ttl, int, 0);
|
||||
MODULE_PARM_DESC(slave_ttl,
|
||||
"Number of searches not seeing a slave before it will be removed");
|
||||
|
||||
DEFINE_MUTEX(w1_mlock);
|
||||
LIST_HEAD(w1_masters);
|
||||
|
|
@ -920,7 +933,12 @@ void w1_slave_found(struct w1_master *dev, u64 rn)
|
|||
}
|
||||
|
||||
/**
|
||||
* Performs a ROM Search & registers any devices found.
|
||||
* w1_search() - Performs a ROM Search & registers any devices found.
|
||||
* @dev: The master device to search
|
||||
* @search_type: W1_SEARCH to search all devices, or W1_ALARM_SEARCH
|
||||
* to return only devices in the alarmed state
|
||||
* @cb: Function to call when a device is found
|
||||
*
|
||||
* The 1-wire search is a simple binary tree search.
|
||||
* For each bit of the address, we read two bits and write one bit.
|
||||
* The bit written will put to sleep all devies that don't match that bit.
|
||||
|
|
@ -930,8 +948,6 @@ void w1_slave_found(struct w1_master *dev, u64 rn)
|
|||
*
|
||||
* See "Application note 187 1-wire search algorithm" at www.maxim-ic.com
|
||||
*
|
||||
* @dev The master device to search
|
||||
* @cb Function to call when a device is found
|
||||
*/
|
||||
void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb)
|
||||
{
|
||||
|
|
@ -990,7 +1006,7 @@ void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb
|
|||
else
|
||||
search_bit = ((last_rn >> i) & 0x1);
|
||||
|
||||
/** Read two bits and write one bit */
|
||||
/* Read two bits and write one bit */
|
||||
triplet_ret = w1_triplet(dev, search_bit);
|
||||
|
||||
/* quit if no device responded */
|
||||
|
|
@ -1074,6 +1090,12 @@ static void w1_search_process(struct w1_master *dev, u8 search_type)
|
|||
w1_search_process_cb(dev, search_type, w1_slave_found);
|
||||
}
|
||||
|
||||
/**
|
||||
* w1_process_callbacks() - execute each dev->async_list callback entry
|
||||
* @dev: w1_master device
|
||||
*
|
||||
* Return: 1 if there were commands to executed 0 otherwise
|
||||
*/
|
||||
int w1_process_callbacks(struct w1_master *dev)
|
||||
{
|
||||
int ret = 0;
|
||||
|
|
|
|||
136
drivers/w1/w1.h
136
drivers/w1/w1.h
|
|
@ -22,6 +22,13 @@
|
|||
#ifndef __W1_H
|
||||
#define __W1_H
|
||||
|
||||
/**
|
||||
* struct w1_reg_num - broken out slave device id
|
||||
*
|
||||
* @family: identifies the type of device
|
||||
* @id: along with family is the unique device id
|
||||
* @crc: checksum of the other bytes
|
||||
*/
|
||||
struct w1_reg_num
|
||||
{
|
||||
#if defined(__LITTLE_ENDIAN_BITFIELD)
|
||||
|
|
@ -60,6 +67,22 @@ struct w1_reg_num
|
|||
#define W1_SLAVE_ACTIVE 0
|
||||
#define W1_SLAVE_DETACH 1
|
||||
|
||||
/**
|
||||
* struct w1_slave - holds a single slave device on the bus
|
||||
*
|
||||
* @owner: Points to the one wire "wire" kernel module.
|
||||
* @name: Device id is ascii.
|
||||
* @w1_slave_entry: data for the linked list
|
||||
* @reg_num: the slave id in binary
|
||||
* @refcnt: reference count, delete when 0
|
||||
* @flags: bit flags for W1_SLAVE_ACTIVE W1_SLAVE_DETACH
|
||||
* @ttl: decrement per search this slave isn't found, deatch at 0
|
||||
* @master: bus which this slave is on
|
||||
* @family: module for device family type
|
||||
* @family_data: pointer for use by the family module
|
||||
* @dev: kernel device identifier
|
||||
*
|
||||
*/
|
||||
struct w1_slave
|
||||
{
|
||||
struct module *owner;
|
||||
|
|
@ -80,77 +103,74 @@ typedef void (*w1_slave_found_callback)(struct w1_master *, u64);
|
|||
|
||||
|
||||
/**
|
||||
* struct w1_bus_master - operations available on a bus master
|
||||
*
|
||||
* @data: the first parameter in all the functions below
|
||||
*
|
||||
* @read_bit: Sample the line level @return the level read (0 or 1)
|
||||
*
|
||||
* @write_bit: Sets the line level
|
||||
*
|
||||
* @touch_bit: the lowest-level function for devices that really support the
|
||||
* 1-wire protocol.
|
||||
* touch_bit(0) = write-0 cycle
|
||||
* touch_bit(1) = write-1 / read cycle
|
||||
* @return the bit read (0 or 1)
|
||||
*
|
||||
* @read_byte: Reads a bytes. Same as 8 touch_bit(1) calls.
|
||||
* @return the byte read
|
||||
*
|
||||
* @write_byte: Writes a byte. Same as 8 touch_bit(x) calls.
|
||||
*
|
||||
* @read_block: Same as a series of read_byte() calls
|
||||
* @return the number of bytes read
|
||||
*
|
||||
* @write_block: Same as a series of write_byte() calls
|
||||
*
|
||||
* @triplet: Combines two reads and a smart write for ROM searches
|
||||
* @return bit0=Id bit1=comp_id bit2=dir_taken
|
||||
*
|
||||
* @reset_bus: long write-0 with a read for the presence pulse detection
|
||||
* @return -1=Error, 0=Device present, 1=No device present
|
||||
*
|
||||
* @set_pullup: Put out a strong pull-up pulse of the specified duration.
|
||||
* @return -1=Error, 0=completed
|
||||
*
|
||||
* @search: Really nice hardware can handles the different types of ROM search
|
||||
* w1_master* is passed to the slave found callback.
|
||||
* u8 is search_type, W1_SEARCH or W1_ALARM_SEARCH
|
||||
*
|
||||
* Note: read_bit and write_bit are very low level functions and should only
|
||||
* be used with hardware that doesn't really support 1-wire operations,
|
||||
* like a parallel/serial port.
|
||||
* Either define read_bit and write_bit OR define, at minimum, touch_bit and
|
||||
* reset_bus.
|
||||
*
|
||||
*/
|
||||
struct w1_bus_master
|
||||
{
|
||||
/** the first parameter in all the functions below */
|
||||
void *data;
|
||||
|
||||
/**
|
||||
* Sample the line level
|
||||
* @return the level read (0 or 1)
|
||||
*/
|
||||
u8 (*read_bit)(void *);
|
||||
|
||||
/** Sets the line level */
|
||||
void (*write_bit)(void *, u8);
|
||||
|
||||
/**
|
||||
* touch_bit is the lowest-level function for devices that really
|
||||
* support the 1-wire protocol.
|
||||
* touch_bit(0) = write-0 cycle
|
||||
* touch_bit(1) = write-1 / read cycle
|
||||
* @return the bit read (0 or 1)
|
||||
*/
|
||||
u8 (*touch_bit)(void *, u8);
|
||||
|
||||
/**
|
||||
* Reads a bytes. Same as 8 touch_bit(1) calls.
|
||||
* @return the byte read
|
||||
*/
|
||||
u8 (*read_byte)(void *);
|
||||
|
||||
/**
|
||||
* Writes a byte. Same as 8 touch_bit(x) calls.
|
||||
*/
|
||||
void (*write_byte)(void *, u8);
|
||||
|
||||
/**
|
||||
* Same as a series of read_byte() calls
|
||||
* @return the number of bytes read
|
||||
*/
|
||||
u8 (*read_block)(void *, u8 *, int);
|
||||
|
||||
/** Same as a series of write_byte() calls */
|
||||
void (*write_block)(void *, const u8 *, int);
|
||||
|
||||
/**
|
||||
* Combines two reads and a smart write for ROM searches
|
||||
* @return bit0=Id bit1=comp_id bit2=dir_taken
|
||||
*/
|
||||
u8 (*triplet)(void *, u8);
|
||||
|
||||
/**
|
||||
* long write-0 with a read for the presence pulse detection
|
||||
* @return -1=Error, 0=Device present, 1=No device present
|
||||
*/
|
||||
u8 (*reset_bus)(void *);
|
||||
|
||||
/**
|
||||
* Put out a strong pull-up pulse of the specified duration.
|
||||
* @return -1=Error, 0=completed
|
||||
*/
|
||||
u8 (*set_pullup)(void *, int);
|
||||
|
||||
/** Really nice hardware can handles the different types of ROM search
|
||||
* w1_master* is passed to the slave found callback.
|
||||
* u8 is search_type, W1_SEARCH or W1_ALARM_SEARCH
|
||||
*/
|
||||
void (*search)(void *, struct w1_master *,
|
||||
u8, w1_slave_found_callback);
|
||||
};
|
||||
|
|
@ -165,6 +185,37 @@ enum w1_master_flags {
|
|||
W1_WARN_MAX_COUNT = 1,
|
||||
};
|
||||
|
||||
/**
|
||||
* struct w1_master - one per bus master
|
||||
* @w1_master_entry: master linked list
|
||||
* @owner: module owner
|
||||
* @name: dynamically allocate bus name
|
||||
* @list_mutex: protect slist and async_list
|
||||
* @slist: linked list of slaves
|
||||
* @async_list: linked list of netlink commands to execute
|
||||
* @max_slave_count: maximum number of slaves to search for at a time
|
||||
* @slave_count: current number of slaves known
|
||||
* @attempts: number of searches ran
|
||||
* @slave_ttl: number of searches before a slave is timed out
|
||||
* @initialized: prevent init/removal race conditions
|
||||
* @id: w1 bus number
|
||||
* @search_count: number of automatic searches to run, -1 unlimited
|
||||
* @search_id: allows continuing a search
|
||||
* @refcnt: reference count
|
||||
* @priv: private data storage
|
||||
* @priv_size: size allocated
|
||||
* @enable_pullup: allows a strong pullup
|
||||
* @pullup_duration: time for the next strong pullup
|
||||
* @flags: one of w1_master_flags
|
||||
* @thread: thread for bus search and netlink commands
|
||||
* @mutex: protect most of w1_master
|
||||
* @bus_mutex: pretect concurrent bus access
|
||||
* @driver: sysfs driver
|
||||
* @dev: sysfs device
|
||||
* @bus_master: io operations available
|
||||
* @seq: sequence number used for netlink broadcasts
|
||||
* @portid: destination for the current netlink command
|
||||
*/
|
||||
struct w1_master
|
||||
{
|
||||
struct list_head w1_master_entry;
|
||||
|
|
@ -173,7 +224,7 @@ struct w1_master
|
|||
/* list_mutex protects just slist and async_list so slaves can be
|
||||
* searched for and async commands added while the master has
|
||||
* w1_master.mutex locked and is operating on the bus.
|
||||
* lock order w1_mlock, w1_master.mutex, w1_master_list_mutex
|
||||
* lock order w1_mlock, w1_master.mutex, w1_master.list_mutex
|
||||
*/
|
||||
struct mutex list_mutex;
|
||||
struct list_head slist;
|
||||
|
|
@ -290,7 +341,6 @@ extern int w1_max_slave_ttl;
|
|||
extern struct list_head w1_masters;
|
||||
extern struct mutex w1_mlock;
|
||||
|
||||
/* returns 1 if there were commands to executed 0 otherwise */
|
||||
extern int w1_process_callbacks(struct w1_master *dev);
|
||||
extern int w1_process(void *);
|
||||
|
||||
|
|
|
|||
|
|
@ -31,6 +31,10 @@
|
|||
DEFINE_SPINLOCK(w1_flock);
|
||||
static LIST_HEAD(w1_families);
|
||||
|
||||
/**
|
||||
* w1_register_family() - register a device family driver
|
||||
* @newf: family to register
|
||||
*/
|
||||
int w1_register_family(struct w1_family *newf)
|
||||
{
|
||||
struct list_head *ent, *n;
|
||||
|
|
@ -59,6 +63,10 @@ int w1_register_family(struct w1_family *newf)
|
|||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* w1_unregister_family() - unregister a device family driver
|
||||
* @fent: family to unregister
|
||||
*/
|
||||
void w1_unregister_family(struct w1_family *fent)
|
||||
{
|
||||
struct list_head *ent, *n;
|
||||
|
|
|
|||
|
|
@ -48,6 +48,12 @@
|
|||
|
||||
struct w1_slave;
|
||||
|
||||
/**
|
||||
* struct w1_family_ops - operations for a family type
|
||||
* @add_slave: add_slave
|
||||
* @remove_slave: remove_slave
|
||||
* @groups: sysfs group
|
||||
*/
|
||||
struct w1_family_ops
|
||||
{
|
||||
int (* add_slave)(struct w1_slave *);
|
||||
|
|
@ -55,6 +61,13 @@ struct w1_family_ops
|
|||
const struct attribute_group **groups;
|
||||
};
|
||||
|
||||
/**
|
||||
* struct w1_family - reference counted family structure.
|
||||
* @family_entry: family linked list
|
||||
* @fid: 8 bit family identifier
|
||||
* @fops: operations for this family
|
||||
* @refcnt: reference counter
|
||||
*/
|
||||
struct w1_family
|
||||
{
|
||||
struct list_head family_entry;
|
||||
|
|
|
|||
|
|
@ -105,6 +105,10 @@ static void w1_free_dev(struct w1_master *dev)
|
|||
device_unregister(&dev->dev);
|
||||
}
|
||||
|
||||
/**
|
||||
* w1_add_master_device() - registers a new master device
|
||||
* @master: master bus device to register
|
||||
*/
|
||||
int w1_add_master_device(struct w1_bus_master *master)
|
||||
{
|
||||
struct w1_master *dev, *entry;
|
||||
|
|
@ -227,6 +231,10 @@ void __w1_remove_master_device(struct w1_master *dev)
|
|||
w1_free_dev(dev);
|
||||
}
|
||||
|
||||
/**
|
||||
* w1_remove_master_device() - unregister a master device
|
||||
* @bm: master bus device to remove
|
||||
*/
|
||||
void w1_remove_master_device(struct w1_bus_master *bm)
|
||||
{
|
||||
struct w1_master *dev, *found = NULL;
|
||||
|
|
|
|||
|
|
@ -62,7 +62,9 @@ static void w1_write_bit(struct w1_master *dev, int bit);
|
|||
static u8 w1_read_bit(struct w1_master *dev);
|
||||
|
||||
/**
|
||||
* Generates a write-0 or write-1 cycle and samples the level.
|
||||
* w1_touch_bit() - Generates a write-0 or write-1 cycle and samples the level.
|
||||
* @dev: the master device
|
||||
* @bit: 0 - write a 0, 1 - write a 0 read the level
|
||||
*/
|
||||
static u8 w1_touch_bit(struct w1_master *dev, int bit)
|
||||
{
|
||||
|
|
@ -77,7 +79,10 @@ static u8 w1_touch_bit(struct w1_master *dev, int bit)
|
|||
}
|
||||
|
||||
/**
|
||||
* Generates a write-0 or write-1 cycle.
|
||||
* w1_write_bit() - Generates a write-0 or write-1 cycle.
|
||||
* @dev: the master device
|
||||
* @bit: bit to write
|
||||
*
|
||||
* Only call if dev->bus_master->touch_bit is NULL
|
||||
*/
|
||||
static void w1_write_bit(struct w1_master *dev, int bit)
|
||||
|
|
@ -102,11 +107,12 @@ static void w1_write_bit(struct w1_master *dev, int bit)
|
|||
}
|
||||
|
||||
/**
|
||||
* w1_pre_write() - pre-write operations
|
||||
* @dev: the master device
|
||||
*
|
||||
* Pre-write operation, currently only supporting strong pullups.
|
||||
* Program the hardware for a strong pullup, if one has been requested and
|
||||
* the hardware supports it.
|
||||
*
|
||||
* @param dev the master device
|
||||
*/
|
||||
static void w1_pre_write(struct w1_master *dev)
|
||||
{
|
||||
|
|
@ -118,11 +124,12 @@ static void w1_pre_write(struct w1_master *dev)
|
|||
}
|
||||
|
||||
/**
|
||||
* w1_post_write() - post-write options
|
||||
* @dev: the master device
|
||||
*
|
||||
* Post-write operation, currently only supporting strong pullups.
|
||||
* If a strong pullup was requested, clear it if the hardware supports
|
||||
* them, or execute the delay otherwise, in either case clear the request.
|
||||
*
|
||||
* @param dev the master device
|
||||
*/
|
||||
static void w1_post_write(struct w1_master *dev)
|
||||
{
|
||||
|
|
@ -136,10 +143,9 @@ static void w1_post_write(struct w1_master *dev)
|
|||
}
|
||||
|
||||
/**
|
||||
* Writes 8 bits.
|
||||
*
|
||||
* @param dev the master device
|
||||
* @param byte the byte to write
|
||||
* w1_write_8() - Writes 8 bits.
|
||||
* @dev: the master device
|
||||
* @byte: the byte to write
|
||||
*/
|
||||
void w1_write_8(struct w1_master *dev, u8 byte)
|
||||
{
|
||||
|
|
@ -161,7 +167,9 @@ EXPORT_SYMBOL_GPL(w1_write_8);
|
|||
|
||||
|
||||
/**
|
||||
* Generates a write-1 cycle and samples the level.
|
||||
* w1_read_bit() - Generates a write-1 cycle and samples the level.
|
||||
* @dev: the master device
|
||||
*
|
||||
* Only call if dev->bus_master->touch_bit is NULL
|
||||
*/
|
||||
static u8 w1_read_bit(struct w1_master *dev)
|
||||
|
|
@ -185,16 +193,17 @@ static u8 w1_read_bit(struct w1_master *dev)
|
|||
}
|
||||
|
||||
/**
|
||||
* Does a triplet - used for searching ROM addresses.
|
||||
* w1_triplet() - * Does a triplet - used for searching ROM addresses.
|
||||
* @dev: the master device
|
||||
* @bdir: the bit to write if both id_bit and comp_bit are 0
|
||||
*
|
||||
* Return bits:
|
||||
* bit 0 = id_bit
|
||||
* bit 1 = comp_bit
|
||||
* bit 2 = dir_taken
|
||||
* If both bits 0 & 1 are set, the search should be restarted.
|
||||
*
|
||||
* @param dev the master device
|
||||
* @param bdir the bit to write if both id_bit and comp_bit are 0
|
||||
* @return bit fields - see above
|
||||
* Return: bit fields - see above
|
||||
*/
|
||||
u8 w1_triplet(struct w1_master *dev, int bdir)
|
||||
{
|
||||
|
|
@ -226,10 +235,10 @@ u8 w1_triplet(struct w1_master *dev, int bdir)
|
|||
}
|
||||
|
||||
/**
|
||||
* Reads 8 bits.
|
||||
* w1_read_8() - Reads 8 bits.
|
||||
* @dev: the master device
|
||||
*
|
||||
* @param dev the master device
|
||||
* @return the byte read
|
||||
* Return: the byte read
|
||||
*/
|
||||
u8 w1_read_8(struct w1_master *dev)
|
||||
{
|
||||
|
|
@ -247,11 +256,10 @@ u8 w1_read_8(struct w1_master *dev)
|
|||
EXPORT_SYMBOL_GPL(w1_read_8);
|
||||
|
||||
/**
|
||||
* Writes a series of bytes.
|
||||
*
|
||||
* @param dev the master device
|
||||
* @param buf pointer to the data to write
|
||||
* @param len the number of bytes to write
|
||||
* w1_write_block() - Writes a series of bytes.
|
||||
* @dev: the master device
|
||||
* @buf: pointer to the data to write
|
||||
* @len: the number of bytes to write
|
||||
*/
|
||||
void w1_write_block(struct w1_master *dev, const u8 *buf, int len)
|
||||
{
|
||||
|
|
@ -269,11 +277,10 @@ void w1_write_block(struct w1_master *dev, const u8 *buf, int len)
|
|||
EXPORT_SYMBOL_GPL(w1_write_block);
|
||||
|
||||
/**
|
||||
* Touches a series of bytes.
|
||||
*
|
||||
* @param dev the master device
|
||||
* @param buf pointer to the data to write
|
||||
* @param len the number of bytes to write
|
||||
* w1_touch_block() - Touches a series of bytes.
|
||||
* @dev: the master device
|
||||
* @buf: pointer to the data to write
|
||||
* @len: the number of bytes to write
|
||||
*/
|
||||
void w1_touch_block(struct w1_master *dev, u8 *buf, int len)
|
||||
{
|
||||
|
|
@ -294,12 +301,11 @@ void w1_touch_block(struct w1_master *dev, u8 *buf, int len)
|
|||
EXPORT_SYMBOL_GPL(w1_touch_block);
|
||||
|
||||
/**
|
||||
* Reads a series of bytes.
|
||||
*
|
||||
* @param dev the master device
|
||||
* @param buf pointer to the buffer to fill
|
||||
* @param len the number of bytes to read
|
||||
* @return the number of bytes read
|
||||
* w1_read_block() - Reads a series of bytes.
|
||||
* @dev: the master device
|
||||
* @buf: pointer to the buffer to fill
|
||||
* @len: the number of bytes to read
|
||||
* Return: the number of bytes read
|
||||
*/
|
||||
u8 w1_read_block(struct w1_master *dev, u8 *buf, int len)
|
||||
{
|
||||
|
|
@ -319,10 +325,9 @@ u8 w1_read_block(struct w1_master *dev, u8 *buf, int len)
|
|||
EXPORT_SYMBOL_GPL(w1_read_block);
|
||||
|
||||
/**
|
||||
* Issues a reset bus sequence.
|
||||
*
|
||||
* @param dev The bus master pointer
|
||||
* @return 0=Device present, 1=No device present or error
|
||||
* w1_reset_bus() - Issues a reset bus sequence.
|
||||
* @dev: the master device
|
||||
* Return: 0=Device present, 1=No device present or error
|
||||
*/
|
||||
int w1_reset_bus(struct w1_master *dev)
|
||||
{
|
||||
|
|
@ -383,12 +388,15 @@ void w1_search_devices(struct w1_master *dev, u8 search_type, w1_slave_found_cal
|
|||
}
|
||||
|
||||
/**
|
||||
* w1_reset_select_slave() - reset and select a slave
|
||||
* @sl: the slave to select
|
||||
*
|
||||
* Resets the bus and then selects the slave by sending either a skip rom
|
||||
* or a rom match.
|
||||
* or a rom match. A skip rom is issued if there is only one device
|
||||
* registered on the bus.
|
||||
* The w1 master lock must be held.
|
||||
*
|
||||
* @param sl the slave to select
|
||||
* @return 0=success, anything else=error
|
||||
* Return: 0=success, anything else=error
|
||||
*/
|
||||
int w1_reset_select_slave(struct w1_slave *sl)
|
||||
{
|
||||
|
|
@ -409,6 +417,9 @@ int w1_reset_select_slave(struct w1_slave *sl)
|
|||
EXPORT_SYMBOL_GPL(w1_reset_select_slave);
|
||||
|
||||
/**
|
||||
* w1_reset_resume_command() - resume instead of another match ROM
|
||||
* @dev: the master device
|
||||
*
|
||||
* When the workflow with a slave amongst many requires several
|
||||
* successive commands a reset between each, this function is similar
|
||||
* to doing a reset then a match ROM for the last matched ROM. The
|
||||
|
|
@ -420,8 +431,6 @@ EXPORT_SYMBOL_GPL(w1_reset_select_slave);
|
|||
* doesn't work of course, but the resume command is the next best thing.
|
||||
*
|
||||
* The w1 master lock must be held.
|
||||
*
|
||||
* @param dev the master device
|
||||
*/
|
||||
int w1_reset_resume_command(struct w1_master *dev)
|
||||
{
|
||||
|
|
@ -435,6 +444,10 @@ int w1_reset_resume_command(struct w1_master *dev)
|
|||
EXPORT_SYMBOL_GPL(w1_reset_resume_command);
|
||||
|
||||
/**
|
||||
* w1_next_pullup() - register for a strong pullup
|
||||
* @dev: the master device
|
||||
* @delay: time in milliseconds
|
||||
*
|
||||
* Put out a strong pull-up of the specified duration after the next write
|
||||
* operation. Not all hardware supports strong pullups. Hardware that
|
||||
* doesn't support strong pullups will sleep for the given time after the
|
||||
|
|
@ -442,8 +455,7 @@ EXPORT_SYMBOL_GPL(w1_reset_resume_command);
|
|||
* the next write, specifying zero will clear a previous request.
|
||||
* The w1 master lock must be held.
|
||||
*
|
||||
* @param delay time in milliseconds
|
||||
* @return 0=success, anything else=error
|
||||
* Return: 0=success, anything else=error
|
||||
*/
|
||||
void w1_next_pullup(struct w1_master *dev, int delay)
|
||||
{
|
||||
|
|
|
|||
|
|
@ -27,7 +27,8 @@
|
|||
|
||||
#include "w1.h"
|
||||
|
||||
/** enum w1_netlink_message_types - message type
|
||||
/**
|
||||
* enum w1_netlink_message_types - message type
|
||||
*
|
||||
* @W1_SLAVE_ADD: notification that a slave device was added
|
||||
* @W1_SLAVE_REMOVE: notification that a slave device was removed
|
||||
|
|
@ -63,7 +64,8 @@ struct w1_netlink_msg
|
|||
__u8 data[0];
|
||||
};
|
||||
|
||||
/** enum w1_commands - commands available for master or slave operations
|
||||
/**
|
||||
* enum w1_commands - commands available for master or slave operations
|
||||
* @W1_CMD_READ: read len bytes
|
||||
* @W1_CMD_WRITE: write len bytes
|
||||
* @W1_CMD_SEARCH: initiate a standard search, returns only the slave
|
||||
|
|
|
|||
Loading…
Reference in New Issue