Author: imp Date: Thu Aug 27 23:33:38 2015 New Revision: 287225 URL: https://svnweb.freebsd.org/changeset/base/287225
Log: New 1-Wire bus implementation. 1-Wire controller is abstracted, though only gpiobus configured via FDT is supported. Bus enumeration is supported. Devices are created for each device found. 1-Wire temperature controllers are supported, but other drivers could be written. Temperatures are polled and reported via a sysctl. Errors are reported via sysctl counters. Mis-wired bus detection is included for more trouble shooting. See ow(4), owc(4) and ow_temp(4) for details of what's supported and known issues. This has been tested on Raspberry Pi-B, Pi2 and Beagle Bone Black with up to 7 devices. Differential Revision: https://reviews.freebsd.org/D2956 Relnotes: yes MFC after: 2 weeks Reviewed by: loos@ (with many insightful comments) Added: head/share/man/man4/ow.4 (contents, props changed) head/share/man/man4/ow_temp.4 (contents, props changed) head/share/man/man4/owc.4 (contents, props changed) head/share/man/man9/owll.9 (contents, props changed) head/share/man/man9/own.9 (contents, props changed) head/sys/dev/ow/ head/sys/dev/ow/README.txt (contents, props changed) head/sys/dev/ow/ow.c (contents, props changed) head/sys/dev/ow/ow.h (contents, props changed) head/sys/dev/ow/ow_temp.c (contents, props changed) head/sys/dev/ow/owc_gpiobus.c (contents, props changed) head/sys/dev/ow/owll.h (contents, props changed) head/sys/dev/ow/owll_if.m (contents, props changed) head/sys/dev/ow/own.h (contents, props changed) head/sys/dev/ow/own_if.m (contents, props changed) head/sys/modules/ow/ head/sys/modules/ow/Makefile (contents, props changed) head/sys/modules/ow/ow/ head/sys/modules/ow/ow/Makefile (contents, props changed) head/sys/modules/ow/ow_temp/ head/sys/modules/ow/ow_temp/Makefile (contents, props changed) head/sys/modules/ow/owc/ head/sys/modules/ow/owc/Makefile (contents, props changed) Modified: head/share/man/man4/Makefile head/share/man/man9/Makefile head/sys/conf/files head/sys/modules/Makefile Modified: head/share/man/man4/Makefile ============================================================================== --- head/share/man/man4/Makefile Thu Aug 27 22:42:02 2015 (r287224) +++ head/share/man/man4/Makefile Thu Aug 27 23:33:38 2015 (r287225) @@ -379,6 +379,9 @@ MAN= aac.4 \ oce.4 \ ohci.4 \ orm.4 \ + ow.4 \ + ow_temp.4 \ + owc.4 \ ${_padlock.4} \ pass.4 \ patm.4 \ @@ -667,6 +670,7 @@ MLINKS+=nge.4 if_nge.4 MLINKS+=${_ntb.4} ${_if_ntb.4} \ ${_ntb.4} ${_ntb_hw.4} MLINKS+=${_nxge.4} ${_if_nxge.4} +MLINKS+=ow.4 onewire.4 MLINKS+=patm.4 if_patm.4 MLINKS+=pccbb.4 cbb.4 MLINKS+=pcm.4 snd.4 \ Added: head/share/man/man4/ow.4 ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/share/man/man4/ow.4 Thu Aug 27 23:33:38 2015 (r287225) @@ -0,0 +1,60 @@ +.\" +.\" Copyright (c) 2015 M. Warner Losh +.\" All rights reserved. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. The name of the author may not be used to endorse or promote products +.\" derived from this software without specific prior written permission. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND +.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE +.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +.\" SUCH DAMAGE. +.\" +.\" $FreeBSD$ +.\" +.Dd July 20, 2015 +.Dt OW 4 +.Os +.Sh NAME +.Nm ow +.Nd Dallas Semiconductor 1-Wire bus +.Sh SYNOPSIS +.Cd device ow +.Sh DESCRIPTION +The +.Nm +module implements the Dallas Semiconductor 1-Wire bus. +It attaches to the +.Xr owc 4 +driver, which implements the low-level signaling of the +1-Wire bus. +.Sh SEE ALSO +.Xr ow_temp 4 , +.Xr owc 4 , +.Xr owll 9 , +.Xr own 9 +.Sh LEGAL +.Tn 1-Wire +is a registered trademark of Maxim Integrated Products, Inc. +.Sh HISTORY +The +.Nm +driver first appeared in +.Fx 11.0 . +.Sh AUTHORS +The +.Nm +device driver and this manual page were written by +.An Warner Losh . Added: head/share/man/man4/ow_temp.4 ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/share/man/man4/ow_temp.4 Thu Aug 27 23:33:38 2015 (r287225) @@ -0,0 +1,155 @@ +.\" +.\" Copyright (c) 2015 M. Warner Losh +.\" All rights reserved. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. The name of the author may not be used to endorse or promote products +.\" derived from this software without specific prior written permission. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND +.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE +.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +.\" SUCH DAMAGE. +.\" +.\" $FreeBSD$ +.\" +.Dd July 20, 2015 +.Dt OW_TEMP 4 +.Os +.Sh NAME +.Nm ow_temp +.Nd Dallas Semiconductor 1-Wire Temperature sensor +.Sh SYNOPSIS +.Cd device ow_temp +.Sh DESCRIPTION +The +.Nm +module supports many of the 1-Wire temperature sensors. +.Pp +The sensor is read periodically and the results returned via a +.Xr sysctl 3 +as described below. +.Sh HARDWARE +These temperature sensors are supported by the +.Nm +driver: +.Bl -tag -width MAX31820 -compact +.It DS1820 +1-Wire Digital Thermometer +.It DS18S20 +High-Precision 1-Wire Digital Thermometer +.It DS18B20 +Programmable Resolution 1-Wire Digital Thermometer +.It DS1822 +Econo 1-Wire Digital Thermometer +.It DS1825 +Programmable Resolution 1-Wire Digital Thermometer with 4-bit ID +.It MAX31820 +1-Wire, Parasite-Power, Ambient Temperature Sensor +.El +.Pp +The driver supports Family codes 0x10, 0x22, 0x28, and 0x3b. +.Sh SYSCTL +The +.Nm +driver reports data via +.Xr sysctl 8 +entries in the device's node in the +.Xr sysctl 8 +tree: +.Bl -tag -width xxxxxxxxxx +.It temperature +The last temperature read, in milli-Kelvin. +.It badcrc +The number of CRC errors in reading the temperature form the +device. +Some CRC errors are to be expected. +High rates of CRC errors, however, generally indicate a noisy +environment, cabling issues, or too many devices on the bus. +.It badread +The number of times a non-CRC error was encountered reading the temperature +from the card. +This type of error is very rare. +.It reading_interval +The time, in ticks, between successive reads of the sensor. +.It parasite +This item is non-zero when the device is connected using its parasitic +power mode. +It can also indicate a wiring error. +.El +.Pp +Temperatures are reported in milli-Kelvin, even though the absolute +accuracy is around 0.2 degrees for the good devices and around 1 +degree for cheaper devices. +The devices report in steps of 0.0625 degrees. +The driver preserves the precision of the device's measurements +in its +.Xr sysctl 8 +reports. +These devices often have a much higher relative accuracy and +repeatability than their absolute accuracy. +This makes them well suited for control loops that strive for +stability and become possible if the full precision is preserved. +.Sh SEE ALSO +.Xr ow 4 , +.Xr owc 4 , +.Xr sysctl 8 , +.Xr owll 9 , +.Xr own 9 +.Sh LEGAL +.Tn 1-Wire +is a registered trademark of Maxim Integrated Products, Inc. +.Sh HISTORY +The +.Nm +driver first appeared in +.Fx 11.0 . +.Sh AUTHORS +The +.Nm +device driver and this manual page were written by +.An Warner Losh . +.Sh BUGS +The parasitic mode of the devices does not work. +It requires support from the +.Xr owc 4 +driver that is unimplemented. +.Pp +The ID bits from the +.Em DS1825 +are not recognized or reported. +.Pp +The type of the device is not reported via +.Xr sysctl 8 . +.Pp +Alarm mode is not supported. +It is not possible to set the low and high alarm temperatures. +.Pp +There is no way to write to the EEPROM. +.Pp +.Dq Convert Temperature +requests are sent directly to the device. +There is no way to use the broadcast ability of the 1-Wire bus to do +all the conversions in parallel. +.Pp +It is not possible to set the precision on those devices that support +it. +.Pp +The time to convert is fixed at 1 second, even though some devices are +faster. +.Pp +There is no character device to supply a stream of readings to a +program. +Programs interested in the temperature must poll the sysctl to get the +temperature. Added: head/share/man/man4/owc.4 ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/share/man/man4/owc.4 Thu Aug 27 23:33:38 2015 (r287225) @@ -0,0 +1,95 @@ +.\" +.\" Copyright (c) 2015 M. Warner Losh +.\" All rights reserved. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. The name of the author may not be used to endorse or promote products +.\" derived from this software without specific prior written permission. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND +.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE +.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +.\" SUCH DAMAGE. +.\" +.\" $FreeBSD$ +.\" +.Dd July 20, 2015 +.Dt OWC 4 +.Os +.Sh NAME +.Nm owc +.Nd Dallas Semiconductor 1-Wire Controller +.Sh SYNOPSIS +.Cd device owc +.Sh DESCRIPTION +The +.Nm +module implements Dallas Semiconductor 1-Wire signaling. +It attaches the +.Xr ow 4 +driver 1-Wire bus protocol. +The +.Nm +device implements the Link Layer of the 1-Wire bus protocol stack. +.Pp +Bit banging a pin on a +.Xr gpiobus 4 +is the only supported controller. +Both standard and overdrive transfer timings are implemented. +Strong pull-up functionality needed to support parasitic mode is not +implemented. +.Pp +To enable 1-Wire for FDT systems requires modifying the DTS for your +board to add something like: +.Bd -literal +/ { + ... + onewire { + compatible = "w1-gpio"; + gpios = <&gpio 4 1>; + }; + ... +}; +.Ed +.Pp +The gpios property describes the GPIO pin the 1-Wire bus is connected +to. +For more details about the +.Va gpios +property, please consult +.Pa /usr/src/sys/boot/fdt/dts/bindings-gpio.txt . +.Sh SEE ALSO +.Xr gpiobus 4 , +.Xr ow 4 , +.Xr ow_temp 4 , +.Xr owll 9 , +.Xr own 9 +.Sh LEGAL +.Tn 1-Wire +is a registered trademark of Maxim Integrated Products, Inc. +.Sh HISTORY +The +.Nm +driver first appeared in +.Fx 11.0 . +.Sh AUTHORS +The +.Nm +device driver and this manual page were written by +.An Warner Losh . +.Sh CAVEATS +The gpio driver implements timing by busy waiting, which can cause a +high load on slower systems. +.Sh BUGS +Overdrive mode has not actually been tested. Modified: head/share/man/man9/Makefile ============================================================================== --- head/share/man/man9/Makefile Thu Aug 27 22:42:02 2015 (r287224) +++ head/share/man/man9/Makefile Thu Aug 27 23:33:38 2015 (r287225) @@ -190,6 +190,8 @@ MAN= accept_filter.9 \ netisr.9 \ nv.9 \ osd.9 \ + owll.9 \ + own.9 \ panic.9 \ pbuf.9 \ PCBGROUP.9 \ Added: head/share/man/man9/owll.9 ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/share/man/man9/owll.9 Thu Aug 27 23:33:38 2015 (r287225) @@ -0,0 +1,93 @@ +.\" +.\" Copyright (c) 2015 M. Warner Losh +.\" All rights reserved. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. The name of the author may not be used to endorse or promote products +.\" derived from this software without specific prior written permission. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND +.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE +.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +.\" SUCH DAMAGE. +.\" +.\" $FreeBSD$ +.\" +.Dd July 20, 2015 +.Dt OWLL 9 +.Os +.Sh NAME +.Nm owll +.Nm OWLL_WRITE_ONE, +.Nm OWLL_WRITE_ZERO, +.Nm OWLL_READ_DATA, +.Nm OWLL_REASET_AND_PRESENCE +.Nd Dallas Semiconductor 1-Wire Link Layer Interface +.Sh SYNOPSIS +.Ft int +.Fn OWLL_WRITE_ONE "device_t lldev" "struct ow_timing *timing" +.Ft int +.Fn OWLL_WRITE_ZERO "device_t lldev" "struct ow_timing *timing" +.Ft int +.Fn OWLL_READ_DATA "device_t lldev" "struct ow_timing *timing" "int *bit" +.Ft int +.Fn OWLL_RESET_AND_PRESENCE "device_t lldev" "struct ow_timing *timing" "int *bit" +.Sh DESCRIPTION +The +.Nm +interface provides access to the link layer of the Dallas +Semiconductor 1-Wire from upper layers of the protocol. +.Pp +.Fn OWLL_WRITE_ONE +and +.Fn OWLL_WRITE_ZERO +writes a one bitor a zero bit respectively on the 1-Wire bus. +.Pp +.Fn OWLL_READ_DATA +reads one bit from the 1-Wire bus. +This is often referred to as a +.Dq Read Time Slot +in the 1-Wire device data sheets. +.Pp +The +.Fn OWLL_RESET_AND_PRESENCE +function starts a reset sequence and detects if any device(s) are +present on the bus. +This is the beginning of all 1-Wire transactions. +.Sh NOTES +This interface is intended to be used only by the +.Xr ow 4 +device to talk to the low-level bus. +By convention, the device that implements this interface is called +.Xr owc 4 . +Only devices that implement +.Xr own 9 +should call these interfaces. +.Sh SEE ALSO +.Xr ow 4 , +.Xr owc 4 , +.Xr own 9 +.Sh LEGAL +.Tn 1-Wire +is a registered trademark of Maxim Integrated Products, Inc. +.Sh HISTORY +The +.Nm +driver first appeared in +.Fx 11.0 . +.Sh AUTHORS +The +.Nm +device driver and this manual page were written by +.An Warner Losh . Added: head/share/man/man9/own.9 ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/share/man/man9/own.9 Thu Aug 27 23:33:38 2015 (r287225) @@ -0,0 +1,230 @@ +.\" +.\" Copyright (c) 2015 M. Warner Losh +.\" All rights reserved. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. The name of the author may not be used to endorse or promote products +.\" derived from this software without specific prior written permission. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND +.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE +.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +.\" SUCH DAMAGE. +.\" +.\" $FreeBSD$ +.\" +.Dd July 20, 2015 +.Dt OWN 9 +.Os +.Sh NAME +.Nm own , +.Nm own_send_command , +.Nm own_commmand_wait , +.Nm own_self_command , +.Nm own_acquire_bus , +.Nm own crc , +.Nm own_release_bus , +.Nm OWN_ACQUIRE_BUS , +.Nm OWN_CRC , +.Nm OWN_RELEASE_BUS , +.Nm OWN_SEND_COMMAND +.Nd Dallas Semiconductor 1-Wire Network and Transport Interface +.Sh SYNOPSIS +.In sys/bus.h +.In dev/ow/own.h +.Ft int +.Fn own_send_command "device_t pdev" "struct ow_cmd *cmd" +.Ft int +.Fn own_command_wait "device_t pdev" "struct ow_cmd *cmd" +.Ft int +.Fn own_self_command "device_t pdev" "struct ow_cmd *cmd" "uint8_t xpt_cmd" +.Ft int +.Fn own_acquire_bus "device_t pdev" "int how" +.Ft int +.Fn own_release_bus "device_t pdev" +.Ft int +.Fn own_crc "device_t pdev" "uint8_t *buffer" "size_t len" +.Ft int +.Fn OWN_SEND_COMMAND "device_t ndev" "device_t pdev" "struct ow_cmd *cmd" +.Ft int +.Fn OWN_ACQUIRE_BUS "device_t ndev" "device_t pdev" "int how" +.Ft void +.Fn OWN_RELEASE_BUS "device_t ndev" "device_t pdev" +.Ft uint8_t +.Fn OWN_CRC "device_t ndev" "device_t pdev" "uint8_t *buffer" "size_t len" +.Sh DESCRIPTION +The +.Nm +interface defines three sets of functions for interacting with 1-Wire +devices: +sending commands, +reserving the bus, +and +ensuring data integrity. +Wrappers are provided for the raw +.Nm OWN +.Xr kobj 9 +interfaces and should be used for improved safety over the +.Xr kobj 9 +ones. +.Ss Bus Commands +The 1-Wire bus defines different layers of access to the devices on +the bus. +The +.Nm +functions provide access to the network and transport layers. +The network layer designates the next command as being either for all +devices on the bus, or for a specific device. +The network layer also specifies the speed used by the link layer. +.Pp +.Vt "struct ow_cmd" +encapsulates network access, speed, and timing information. +It specifies the commands to send and whether or not to read data. +Its members are: +.Bl -tag -width ".Va xxxx" +.It Va flags +Flags controlling the interpretation of the structure. +These flags are defined in +.In dev/ow/ow.h : +.Bl -tag -width indent +.It OW_FLAG_OVERDRIVE +Send +.Va xpt_cmd +bytes and read +.Va xpt_read +bytes at overdrive speed. +.It OW_FLAG_READ_BIT +Interpret +.Va xpt_read_len +to be in bits to be read after +.Va xpt_cmd +rather than bytes. +.El +.It Va rom_cmd +ROM command bytes to send. +.It Va rom_len +Number of ROM command bytes to send. +.It Va rom_read_len +Number of bytes to read after sending the ROM command. +.It Va rom_read +Buffer for bytes read after the ROM command. +.It Va xpt_cmd +Transport command to send. +.It Va xpt_len +Length of the transport command bytes to send. +Specify 0 for no transport command. +.It Va xpt_read_len +Number of bytes to read after +.Va xpt_cmd +bytes are sent. +If the +.Dv OW_FLAG_READ_BIT +bit is set in +.Va flags , +then it is the number of bits to read. +Bits read are packed into bytes. +.It Va xpt_read +Buffer for data read. +.El +.Pp +.Fn own_command_wait +acquires the 1-Wire bus, waiting if necessary, +sends the command, +and +then releases the bus. +.Fn own_send_command +sends the command without bus reservation. +.Fa pdev +is the client device (the presentation layer device) sending the command. +The +.Fa cmd +argument describes the transaction to send to the 1-Wire bus. +.Pp +.Fn own_self_command +fills in +.Fa cmd +with a MATCH_ROM ROM command, the ROM address of +.Fa pdev +and the +.Fa xpt_cmd +as a convenient way to create directed commands. +.Ss Bus Reservation +The 1-Wire system includes an advisory lock for the bus that +presentation layer devices can use to coordinate access. +Locking is purely advisory at this time. +.Pp +.Fn own_acquire_bus +reserves the bus. +It waits indefinitely if the +.Fa how +argument is +.Dv OWN_WAIT +and returns the error +.Dv EWOULDBLOCK +if passed +.Dv OWN_DONTWAIT +when the bus is owned by another client. +.Pp +.Fn own_release_bus +releases the bus. +.Ss Data Integrity +.Fn own_crc +computes the 1-Wire standard CRC function over the data +passed in +.Fa buffer +and +.Fa len +and returns the result. +.Ss Notes +The 1-Wire standard (Maxim AN937) defines layers that are akin to ISO +networking layers. +The lowest relevant layer, the link layer, defines the polling windows +and the timing of the signaling of different modes. +The network layer is built on top of the link layer +and is used to address devices in a unicast or multicast manner. +The transport layer defines commands and responses from the devices. +The presentation layer is composed of the device specific commands and +actions used to control the specific 1-Wire devices on bus. +.Pp +These interfaces are implemented by the +.Xr ow 4 +device. +Presentation layer devices (children of the newbus +.Xr ow 4 +device) should only call the functions described here. +The functionality provided by the +.Xr owc 4 +device (specifically the +.Xr owll 9 +interface) should only be called by the +.Xr ow 4 +driver. +.Sh SEE ALSO +.Xr ow 4 , +.Xr owc 4 , +.Xr owll 9 +.Pa http://pdfserv.maximintegrated.com/en/an/AN937.pdf +.Sh LEGAL +.Tn 1-Wire +is a registered trademark of Maxim Integrated Products, Inc. +.Sh HISTORY +The +.Nm +driver first appeared in +.Fx 11.0 . +.Sh AUTHORS +The +.Nm +device driver and this manual page were written by +.An Warner Losh . Modified: head/sys/conf/files ============================================================================== --- head/sys/conf/files Thu Aug 27 22:42:02 2015 (r287224) +++ head/sys/conf/files Thu Aug 27 23:33:38 2015 (r287225) @@ -2088,6 +2088,13 @@ dev/ofw/ofw_iicbus.c optional fdt iicbu dev/ofw/ofwbus.c optional fdt dev/ofw/openfirm.c optional fdt dev/ofw/openfirmio.c optional fdt +dev/ow/ow.c optional ow \ + dependency "owll_if.h" \ + dependency "own_if.h" +dev/ow/owll_if.m optional ow +dev/ow/own_if.m optional ow +dev/ow/ow_temp.c optional ow_temp +dev/ow/owc_gpiobus.c optional owc gpio dev/patm/if_patm.c optional patm pci dev/patm/if_patm_attach.c optional patm pci dev/patm/if_patm_intr.c optional patm pci Added: head/sys/dev/ow/README.txt ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/sys/dev/ow/README.txt Thu Aug 27 23:33:38 2015 (r287225) @@ -0,0 +1,19 @@ +Quick Design Document for 1-wire bus + +In new bus terms, 1-wire devices are attached to 1-wire buses (ow) +which are attached to a one wire bridge (owc). + +The implementation follows the terminology used in the Maxim AN927 +Application note which defines the 1-wire bus as implemented for the +iButton product. This is considered to be the canonical definition of +the 1-wire bus. This means that the 1-wire bridge will implement the +owll(9) interface. ow is one wire. ll is for Link Level to mirror the ISO +stack terminology used by AN927. The 1-wire bus is implemented in the ow(4) +device, which implements the own(9) interface (n for network, the layer +described in the AN927). The presentation layer and above is the +responsibility of the client device drivers to implement. + +Client drivers may only call the own(9) interface. The ow(4) driver +calls the owll(9) interface and implements the own(9). + +$FreeBSD$ Added: head/sys/dev/ow/ow.c ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/sys/dev/ow/ow.c Thu Aug 27 23:33:38 2015 (r287225) @@ -0,0 +1,639 @@ +/*- + * Copyright (c) 2015 M. Warner Losh <i...@freebsd.org> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice unmodified, this list of conditions, and the following + * disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/kernel.h> + +#include <sys/bus.h> +#include <sys/errno.h> +#include <sys/libkern.h> +#include <sys/malloc.h> +#include <sys/module.h> + +#include <dev/ow/ow.h> +#include <dev/ow/owll.h> +#include <dev/ow/own.h> + +/* + * lldev - link level device + * ndev - network / transport device (this module) + * pdev - presentation device (children of this module) + */ + +typedef int ow_enum_fn(device_t, device_t); +typedef int ow_found_fn(device_t, romid_t); + +struct ow_softc +{ + device_t dev; /* Newbus driver back pointer */ + struct mtx mtx; /* bus mutex */ + device_t owner; /* bus owner, if != NULL */ +}; + +struct ow_devinfo +{ + romid_t romid; +}; + +static int ow_acquire_bus(device_t ndev, device_t pdev, int how); +static void ow_release_bus(device_t ndev, device_t pdev); + +#define OW_LOCK(_sc) mtx_lock(&(_sc)->mtx) +#define OW_UNLOCK(_sc) mtx_unlock(&(_sc)->mtx) +#define OW_LOCK_DESTROY(_sc) mtx_destroy(&_sc->mtx) +#define OW_ASSERT_LOCKED(_sc) mtx_assert(&_sc->mtx, MA_OWNED) +#define OW_ASSERT_UNLOCKED(_sc) mtx_assert(&_sc->mtx, MA_NOTOWNED) + +static MALLOC_DEFINE(M_OW, "ow", "House keeping data for 1wire bus"); + +static struct ow_timing timing_regular = { + .t_slot = 60, /* 60 to 120 */ + .t_low0 = 60, /* really 60 to 120 */ + .t_low1 = 1, /* really 1 to 15 */ + .t_release = 45, /* <= 45us */ + .t_rec = 1, /* at least 1us */ + .t_rdv = 15, /* 15us */ + .t_rstl = 480, /* 480us or more */ + .t_rsth = 480, /* 480us or more */ + .t_pdl = 60, /* 60us to 240us */ + .t_pdh = 60, /* 15us to 60us */ + .t_lowr = 1, /* 1us */ +}; + +/* NB: Untested */ +static struct ow_timing timing_overdrive = { + .t_slot = 11, /* 6us to 16us */ + .t_low0 = 6, /* really 6 to 16 */ + .t_low1 = 1, /* really 1 to 2 */ + .t_release = 4, /* <= 4us */ + .t_rec = 1, /* at least 1us */ + .t_rdv = 2, /* 2us */ + .t_rstl = 48, /* 48us to 80us */ + .t_rsth = 48, /* 48us or more */ + .t_pdl = 8, /* 8us to 24us */ + .t_pdh = 2, /* 2us to 6us */ + .t_lowr = 1, /* 1us */ +}; + +static void +ow_send_byte(device_t lldev, struct ow_timing *t, uint8_t byte) +{ + int i; + + for (i = 0; i < 8; i++) + if (byte & (1 << i)) + OWLL_WRITE_ONE(lldev, t); + else + OWLL_WRITE_ZERO(lldev, t); +} + +static void +ow_read_byte(device_t lldev, struct ow_timing *t, uint8_t *bytep) +{ + int i; + uint8_t byte = 0; + int bit; + + for (i = 0; i < 8; i++) { + OWLL_READ_DATA(lldev, t, &bit); + byte |= bit << i; + } + *bytep = byte; +} + +static int +ow_send_command(device_t ndev, device_t pdev, struct ow_cmd *cmd) +{ + int present, i, bit, tries; + device_t lldev; + struct ow_timing *t; + + lldev = device_get_parent(ndev); + + /* + * Retry the reset a couple of times before giving up. + */ + tries = 4; + do { + OWLL_RESET_AND_PRESENCE(lldev, &timing_regular, &present); + if (present == 1) + device_printf(ndev, "Reset said no device on bus?.\n"); + } while (present == 1 && tries-- > 0); + if (present == 1) { + device_printf(ndev, "Reset said the device wasn't there.\n"); + return ENOENT; /* No devices acked the RESET */ + } + if (present == -1) { + device_printf(ndev, "Reset discovered bus wired wrong.\n"); + return ENOENT; + } + + for (i = 0; i < cmd->rom_len; i++) + ow_send_byte(lldev, &timing_regular, cmd->rom_cmd[i]); + for (i = 0; i < cmd->rom_read_len; i++) + ow_read_byte(lldev, &timing_regular, cmd->rom_read + i); + if (cmd->xpt_len) { + /* + * Per AN937, the reset pulse and ROM level are always + * done with the regular timings. Certain ROM commands + * put the device into overdrive mode for the remainder + * of the data transfer, which is why we have to pass the + * timings here. Commands that need to be handled like this + * are expected to be flagged by the client. + */ + t = (cmd->flags & OW_FLAG_OVERDRIVE) ? + &timing_overdrive : &timing_regular; + for (i = 0; i < cmd->xpt_len; i++) + ow_send_byte(lldev, t, cmd->xpt_cmd[i]); + if (cmd->flags & OW_FLAG_READ_BIT) { + memset(cmd->xpt_read, 0, (cmd->xpt_read_len + 7) / 8); + for (i = 0; i < cmd->xpt_read_len; i++) { + OWLL_READ_DATA(lldev, t, &bit); + cmd->xpt_read[i / 8] |= bit << (i % 8); + } + } else { + for (i = 0; i < cmd->xpt_read_len; i++) + ow_read_byte(lldev, t, cmd->xpt_read + i); + } + } + return 0; +} + +static int +ow_search_rom(device_t lldev, device_t dev) +{ + struct ow_cmd cmd; + + memset(&cmd, 0, sizeof(cmd)); + cmd.rom_cmd[0] = SEARCH_ROM; + cmd.rom_len = 1; + return ow_send_command(lldev, dev, &cmd); +} + +#if 0 +static int +ow_alarm_search(device_t lldev, device_t dev) +{ + struct ow_cmd cmd; + + memset(&cmd, 0, sizeof(cmd)); + cmd.rom_cmd[0] = ALARM_SEARCH; + cmd.rom_len = 1; + return ow_send_command(lldev, dev, &cmd); +} +#endif + +static int +ow_add_child(device_t dev, romid_t romid) +{ + struct ow_devinfo *di; + device_t child; + + di = malloc(sizeof(*di), M_OW, M_WAITOK); + di->romid = romid; + child = device_add_child(dev, NULL, -1); + if (child == NULL) { + free(di, M_OW); + return ENOMEM; + } + device_set_ivars(child, di); + return (0); +} + +static device_t +ow_child_by_romid(device_t dev, romid_t romid) +{ + device_t *children, retval, child; + int nkid, i; + struct ow_devinfo *di; + + if (device_get_children(dev, &children, &nkid) != 0) + return (NULL); + retval = NULL; + for (i = 0; i < nkid; i++) { + child = children[i]; + di = device_get_ivars(child); + if (di->romid == romid) { + retval = child; + break; + } + } + free(children, M_TEMP); + + return (retval); +} + +/* + * CRC generator table -- taken from AN937 DOW CRC LOOKUP FUNCTION Table 2 + */ +const uint8_t ow_crc_table[] = { + 0, 94, 188, 226, 97, 63, 221, 131, 194, 156, 126, 32, 163, 253, 31, 65, + 157, 195, 33, 127, 252, 162, 64, 30, 95, 1, 227, 189, 62, 96, 130, 220, + 35, 125, 159, 193, 66, 28, 254, 160, 225, 191, 93, 3, 128, 222, 60, 98, + 190, 224, 2, 92, 223, 129, 99, 61, 124, 34, 192, 158, 29, 67, 161, 255, + 70, 24, 250, 164, 39, 121, 155, 197, 132, 218, 56, 102, 229, 187, 89, 7, + 219, 133,103, 57, 186, 228, 6, 88, 25, 71, 165, 251, 120, 38, 196, 154, + 101, 59, 217, 135, 4, 90, 184, 230, 167, 249, 27, 69, 198, 152, 122, 36, + 248, 166, 68, 26, 153, 199, 37, 123, 58, 100, 134, 216, 91, 5, 231, 185, + 140,210, 48, 110, 237, 179, 81, 15, 78, 16, 242, 172, 47, 113,147, 205, + 17, 79, 173, 243, 112, 46, 204, 146, 211,141, 111, 49, 178, 236, 14, 80, + 175, 241, 19, 77, 206, 144, 114, 44, 109, 51, 209, 143, 12, 82,176, 238, + 50, 108, 142, 208, 83, 13, 239, 177, 240, 174, 76, 18, 145, 207, 45, 115, + 202, 148, 118, 40, 171, 245, 23, 73, 8, 86, 180, 234, 105, 55, 213, 139, + 87, 9, 235, 181, 54, 104, 138, 212, 149, 203, 41, 119, 244, 170, 72, 22, + 233, 183, 85, 11, 136, 214, 52, 106, 43, 117, 151, 201, 74, 20, 246, 168, + 116, 42, 200, 150, 21, 75, 169, 247, 182, 232, 10, 84, 215, 137, 107, 53 +}; + +/* + * Converted from DO_CRC page 131 ANN937 + */ +static uint8_t +ow_crc(device_t ndev, device_t pdev, uint8_t *buffer, size_t len) +{ *** DIFF OUTPUT TRUNCATED AT 1000 LINES *** _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
