From 9a4aa7bfce3764b1795ce283b52808b72aad1a66 Mon Sep 17 00:00:00 2001 From: Mauro Carvalho Chehab Date: Tue, 16 May 2017 11:23:58 -0300 Subject: [PATCH] pnp.txt: standardize document format Each text file under Documentation follows a different format. Some doesn't even have titles! Change its representation to follow the adopted standard, using ReST markups for it to be parseable by Sphinx: - Use a markup for document title; - use :Author: and :Last updated: for authorship; - adjust whitespaces where needed; - mark literal blocks; - fix a few subtitle markups. Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Jonathan Corbet --- Documentation/pnp.txt | 343 +++++++++++++++++++++++------------------- 1 file changed, 192 insertions(+), 151 deletions(-) diff --git a/Documentation/pnp.txt b/Documentation/pnp.txt index 763e4659bf18..bab2d10631f0 100644 --- a/Documentation/pnp.txt +++ b/Documentation/pnp.txt @@ -1,98 +1,118 @@ +================================= Linux Plug and Play Documentation -by Adam Belay -last updated: Oct. 16, 2002 ---------------------------------------------------------------------------------------- +================================= +:Author: Adam Belay +:Last updated: Oct. 16, 2002 Overview -------- - Plug and Play provides a means of detecting and setting resources for legacy or + +Plug and Play provides a means of detecting and setting resources for legacy or otherwise unconfigurable devices. The Linux Plug and Play Layer provides these services to compatible drivers. - The User Interface ------------------ - The Linux Plug and Play user interface provides a means to activate PnP devices + +The Linux Plug and Play user interface provides a means to activate PnP devices for legacy and user level drivers that do not support Linux Plug and Play. The user interface is integrated into sysfs. In addition to the standard sysfs file the following are created in each device's directory: -id - displays a list of support EISA IDs -options - displays possible resource configurations -resources - displays currently allocated resources and allows resource changes +- id - displays a list of support EISA IDs +- options - displays possible resource configurations +- resources - displays currently allocated resources and allows resource changes --activating a device +activating a device +^^^^^^^^^^^^^^^^^^^ -#echo "auto" > resources +:: + + # echo "auto" > resources this will invoke the automatic resource config system to activate the device --manually activating a device +manually activating a device +^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +:: + + # echo "manual " > resources -#echo "manual " > resources - - the configuration number - - static or dynamic - static = for next boot - dynamic = now + - the configuration number + - static or dynamic + static = for next boot + dynamic = now --disabling a device +disabling a device +^^^^^^^^^^^^^^^^^^ -#echo "disable" > resources +:: + + # echo "disable" > resources EXAMPLE: Suppose you need to activate the floppy disk controller. -1.) change to the proper directory, in my case it is -/driver/bus/pnp/devices/00:0f -# cd /driver/bus/pnp/devices/00:0f -# cat name -PC standard floppy disk controller - -2.) check if the device is already active -# cat resources -DISABLED - -- Notice the string "DISABLED". This means the device is not active. - -3.) check the device's possible configurations (optional) -# cat options -Dependent: 01 - Priority acceptable - port 0x3f0-0x3f0, align 0x7, size 0x6, 16-bit address decoding - port 0x3f7-0x3f7, align 0x0, size 0x1, 16-bit address decoding - irq 6 - dma 2 8-bit compatible -Dependent: 02 - Priority acceptable - port 0x370-0x370, align 0x7, size 0x6, 16-bit address decoding - port 0x377-0x377, align 0x0, size 0x1, 16-bit address decoding - irq 6 - dma 2 8-bit compatible - -4.) now activate the device -# echo "auto" > resources - -5.) finally check if the device is active -# cat resources -io 0x3f0-0x3f5 -io 0x3f7-0x3f7 -irq 6 -dma 2 - -also there are a series of kernel parameters: -pnp_reserve_irq=irq1[,irq2] .... -pnp_reserve_dma=dma1[,dma2] .... -pnp_reserve_io=io1,size1[,io2,size2] .... -pnp_reserve_mem=mem1,size1[,mem2,size2] .... + +1. change to the proper directory, in my case it is + /driver/bus/pnp/devices/00:0f:: + + # cd /driver/bus/pnp/devices/00:0f + # cat name + PC standard floppy disk controller + +2. check if the device is already active:: + + # cat resources + DISABLED + + - Notice the string "DISABLED". This means the device is not active. + +3. check the device's possible configurations (optional):: + + # cat options + Dependent: 01 - Priority acceptable + port 0x3f0-0x3f0, align 0x7, size 0x6, 16-bit address decoding + port 0x3f7-0x3f7, align 0x0, size 0x1, 16-bit address decoding + irq 6 + dma 2 8-bit compatible + Dependent: 02 - Priority acceptable + port 0x370-0x370, align 0x7, size 0x6, 16-bit address decoding + port 0x377-0x377, align 0x0, size 0x1, 16-bit address decoding + irq 6 + dma 2 8-bit compatible + +4. now activate the device:: + + # echo "auto" > resources + +5. finally check if the device is active:: + + # cat resources + io 0x3f0-0x3f5 + io 0x3f7-0x3f7 + irq 6 + dma 2 + +also there are a series of kernel parameters:: + + pnp_reserve_irq=irq1[,irq2] .... + pnp_reserve_dma=dma1[,dma2] .... + pnp_reserve_io=io1,size1[,io2,size2] .... + pnp_reserve_mem=mem1,size1[,mem2,size2] .... The Unified Plug and Play Layer ------------------------------- - All Plug and Play drivers, protocols, and services meet at a central location + +All Plug and Play drivers, protocols, and services meet at a central location called the Plug and Play Layer. This layer is responsible for the exchange of information between PnP drivers and PnP protocols. Thus it automatically forwards commands to the proper protocol. This makes writing PnP drivers @@ -101,64 +121,73 @@ significantly easier. The following functions are available from the Plug and Play Layer: pnp_get_protocol -- increments the number of uses by one + increments the number of uses by one pnp_put_protocol -- deincrements the number of uses by one + deincrements the number of uses by one pnp_register_protocol -- use this to register a new PnP protocol + use this to register a new PnP protocol pnp_unregister_protocol -- use this function to remove a PnP protocol from the Plug and Play Layer + use this function to remove a PnP protocol from the Plug and Play Layer pnp_register_driver -- adds a PnP driver to the Plug and Play Layer -- this includes driver model integration -- returns zero for success or a negative error number for failure; count + adds a PnP driver to the Plug and Play Layer + + this includes driver model integration + returns zero for success or a negative error number for failure; count calls to the .add() method if you need to know how many devices bind to the driver pnp_unregister_driver -- removes a PnP driver from the Plug and Play Layer + removes a PnP driver from the Plug and Play Layer Plug and Play Protocols ----------------------- - This section contains information for PnP protocol developers. + +This section contains information for PnP protocol developers. The following Protocols are currently available in the computing world: -- PNPBIOS: used for system devices such as serial and parallel ports. -- ISAPNP: provides PnP support for the ISA bus -- ACPI: among its many uses, ACPI provides information about system level -devices. + +- PNPBIOS: + used for system devices such as serial and parallel ports. +- ISAPNP: + provides PnP support for the ISA bus +- ACPI: + among its many uses, ACPI provides information about system level + devices. + It is meant to replace the PNPBIOS. It is not currently supported by Linux Plug and Play but it is planned to be in the near future. Requirements for a Linux PnP protocol: -1.) the protocol must use EISA IDs -2.) the protocol must inform the PnP Layer of a device's current configuration +1. the protocol must use EISA IDs +2. the protocol must inform the PnP Layer of a device's current configuration + - the ability to set resources is optional but preferred. The following are PnP protocol related functions: pnp_add_device -- use this function to add a PnP device to the PnP layer -- only call this function when all wanted values are set in the pnp_dev -structure + use this function to add a PnP device to the PnP layer + + only call this function when all wanted values are set in the pnp_dev + structure pnp_init_device -- call this to initialize the PnP structure + call this to initialize the PnP structure pnp_remove_device -- call this to remove a device from the Plug and Play Layer. -- it will fail if the device is still in use. -- automatically will free mem used by the device and related structures + call this to remove a device from the Plug and Play Layer. + it will fail if the device is still in use. + automatically will free mem used by the device and related structures pnp_add_id -- adds an EISA ID to the list of supported IDs for the specified device + adds an EISA ID to the list of supported IDs for the specified device For more information consult the source of a protocol such as /drivers/pnp/pnpbios/core.c. @@ -167,85 +196,97 @@ For more information consult the source of a protocol such as Linux Plug and Play Drivers --------------------------- - This section contains information for Linux PnP driver developers. + +This section contains information for Linux PnP driver developers. The New Way -........... -1.) first make a list of supported EISA IDS -ex: -static const struct pnp_id pnp_dev_table[] = { - /* Standard LPT Printer Port */ - {.id = "PNP0400", .driver_data = 0}, - /* ECP Printer Port */ - {.id = "PNP0401", .driver_data = 0}, - {.id = ""} -}; - -Please note that the character 'X' can be used as a wild card in the function -portion (last four characters). -ex: +^^^^^^^^^^^ + +1. first make a list of supported EISA IDS + + ex:: + + static const struct pnp_id pnp_dev_table[] = { + /* Standard LPT Printer Port */ + {.id = "PNP0400", .driver_data = 0}, + /* ECP Printer Port */ + {.id = "PNP0401", .driver_data = 0}, + {.id = ""} + }; + + Please note that the character 'X' can be used as a wild card in the function + portion (last four characters). + + ex:: + /* Unknown PnP modems */ { "PNPCXXX", UNKNOWN_DEV }, -Supported PnP card IDs can optionally be defined. -ex: -static const struct pnp_id pnp_card_table[] = { - { "ANYDEVS", 0 }, - { "", 0 } -}; - -2.) Optionally define probe and remove functions. It may make sense not to -define these functions if the driver already has a reliable method of detecting -the resources, such as the parport_pc driver. -ex: -static int -serial_pnp_probe(struct pnp_dev * dev, const struct pnp_id *card_id, const - struct pnp_id *dev_id) -{ -. . . - -ex: -static void serial_pnp_remove(struct pnp_dev * dev) -{ -. . . - -consult /drivers/serial/8250_pnp.c for more information. - -3.) create a driver structure -ex: - -static struct pnp_driver serial_pnp_driver = { - .name = "serial", - .card_id_table = pnp_card_table, - .id_table = pnp_dev_table, - .probe = serial_pnp_probe, - .remove = serial_pnp_remove, -}; - -* name and id_table cannot be NULL. - -4.) register the driver -ex: - -static int __init serial8250_pnp_init(void) -{ - return pnp_register_driver(&serial_pnp_driver); -} + Supported PnP card IDs can optionally be defined. + ex:: + + static const struct pnp_id pnp_card_table[] = { + { "ANYDEVS", 0 }, + { "", 0 } + }; + +2. Optionally define probe and remove functions. It may make sense not to + define these functions if the driver already has a reliable method of detecting + the resources, such as the parport_pc driver. + + ex:: + + static int + serial_pnp_probe(struct pnp_dev * dev, const struct pnp_id *card_id, const + struct pnp_id *dev_id) + { + . . . + + ex:: + + static void serial_pnp_remove(struct pnp_dev * dev) + { + . . . + + consult /drivers/serial/8250_pnp.c for more information. + +3. create a driver structure + + ex:: + + static struct pnp_driver serial_pnp_driver = { + .name = "serial", + .card_id_table = pnp_card_table, + .id_table = pnp_dev_table, + .probe = serial_pnp_probe, + .remove = serial_pnp_remove, + }; + + * name and id_table cannot be NULL. + +4. register the driver + + ex:: + + static int __init serial8250_pnp_init(void) + { + return pnp_register_driver(&serial_pnp_driver); + } The Old Way -........... +^^^^^^^^^^^ A series of compatibility functions have been created to make it easy to convert ISAPNP drivers. They should serve as a temporary solution only. -They are as follows: +They are as follows:: -struct pnp_card *pnp_find_card(unsigned short vendor, - unsigned short device, - struct pnp_card *from) + struct pnp_card *pnp_find_card(unsigned short vendor, + unsigned short device, + struct pnp_card *from) -struct pnp_dev *pnp_find_dev(struct pnp_card *card, - unsigned short vendor, - unsigned short function, - struct pnp_dev *from) + struct pnp_dev *pnp_find_dev(struct pnp_card *card, + unsigned short vendor, + unsigned short function, + struct pnp_dev *from) -- 2.20.1