From 9b0ce690ff0516956b9fa200f626f74455cf9e86 Mon Sep 17 00:00:00 2001 From: Mauro Carvalho Chehab Date: Tue, 4 Apr 2017 17:41:40 -0700 Subject: Input: convert gameport programming documentation into ReST format This file require minimum adjustments to be a valid ReST. Do it, in order to be able to parse it with Sphinx. Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Dmitry Torokhov --- Documentation/input/gameport-programming.txt | 83 ++++++++++++++++++++-------- 1 file changed, 59 insertions(+), 24 deletions(-) (limited to 'Documentation/input') diff --git a/Documentation/input/gameport-programming.txt b/Documentation/input/gameport-programming.txt index 03a74fc3b496..c96911df1c54 100644 --- a/Documentation/input/gameport-programming.txt +++ b/Documentation/input/gameport-programming.txt @@ -1,11 +1,12 @@ +~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Programming gameport drivers ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -1. A basic classic gameport -~~~~~~~~~~~~~~~~~~~~~~~~~~~ +A basic classic gameport +~~~~~~~~~~~~~~~~~~~~~~~~ If the gameport doesn't provide more than the inb()/outb() functionality, -the code needed to register it with the joystick drivers is simple: +the code needed to register it with the joystick drivers is simple:: struct gameport gameport; @@ -37,12 +38,12 @@ space only when something really is using it. Disable it again in the callback, so that it doesn't fail if some of the possible addresses are already occupied by other gameports. -2. Memory mapped gameport -~~~~~~~~~~~~~~~~~~~~~~~~~ +Memory mapped gameport +~~~~~~~~~~~~~~~~~~~~~~ When a gameport can be accessed through MMIO, this way is preferred, because it is faster, allowing more reads per second. Registering such a gameport -isn't as easy as a basic IO one, but not so much complex: +isn't as easy as a basic IO one, but not so much complex:: struct gameport gameport; @@ -53,19 +54,21 @@ isn't as easy as a basic IO one, but not so much complex: unsigned char my_read(struct gameport *gameport) { - return my_mmio; + return my_mmio; } gameport.read = my_read; gameport.trigger = my_trigger; gameport_register_port(&gameport); -3. Cooked mode gameport -~~~~~~~~~~~~~~~~~~~~~~~ +.. _gameport_pgm_cooked_mode: + +Cooked mode gameport +~~~~~~~~~~~~~~~~~~~~ There are gameports that can report the axis values as numbers, that means the driver doesn't have to measure them the old way - an ADC is built into -the gameport. To register a cooked gameport: +the gameport. To register a cooked gameport:: struct gameport gameport; @@ -95,8 +98,8 @@ See analog.c and input.c for handling of fuzz - the fuzz value determines the size of a gaussian filter window that is used to eliminate the noise in the data. -4. More complex gameports -~~~~~~~~~~~~~~~~~~~~~~~~~ +More complex gameports +~~~~~~~~~~~~~~~~~~~~~~ Gameports can support both raw and cooked modes. In that case combine either examples 1+2 or 1+3. Gameports can support internal calibration - see below, @@ -104,65 +107,91 @@ and also lightning.c and analog.c on how that works. If your driver supports more than one gameport instance simultaneously, use the ->private member of the gameport struct to point to your data. -5. Unregistering a gameport -~~~~~~~~~~~~~~~~~~~~~~~~~~~ +Unregistering a gameport +~~~~~~~~~~~~~~~~~~~~~~~~ + +Simple:: + + gameport_unregister_port(&gameport); + +The gameport structure +~~~~~~~~~~~~~~~~~~~~~~ -Simple: +.. note:: -gameport_unregister_port(&gameport); + This section is outdated. There are several fields here that don't + match what's there at include/linux/gameport.h. -6. The gameport structure -~~~~~~~~~~~~~~~~~~~~~~~~~ +:: -struct gameport { + struct gameport { void *private; A private pointer for free use in the gameport driver. (Not the joystick driver!) +:: + int number; Number assigned to the gameport when registered. Informational purpose only. +:: + int io; I/O address for use with raw mode. You have to either set this, or ->read() to some value if your gameport supports raw mode. +:: + int speed; Raw mode speed of the gameport reads in thousands of reads per second. +:: + int fuzz; If the gameport supports cooked mode, this should be set to a value that -represents the amount of noise in the data. See section 3. +represents the amount of noise in the data. See +:ref:`gameport_pgm_cooked_mode`. + +:: void (*trigger)(struct gameport *); Trigger. This function should trigger the ns558 oneshots. If set to NULL, outb(0xff, io) will be used. +:: + unsigned char (*read)(struct gameport *); Read the buttons and ns558 oneshot bits. If set to NULL, inb(io) will be used instead. - int (*cooked_read)(struct gameport *, int *axes, int *buttons); +:: + + int (*cooked_read)(struct gameport *, int *axes, int *buttons); If the gameport supports cooked mode, it should point this to its cooked read function. It should fill axes[0..3] with four values of the joystick axes and buttons[0] with four bits representing the buttons. - int (*calibrate)(struct gameport *, int *axes, int *max); +:: + + int (*calibrate)(struct gameport *, int *axes, int *max); Function for calibrating the ADC hardware. When called, axes[0..3] should be pre-filled by cooked data by the caller, max[0..3] should be pre-filled with expected maximums for each axis. The calibrate() function should set the sensitivity of the ADC hardware so that the maximums fit in its range and recompute the axes[] values to match the new sensitivity or re-read them from -the hardware so that they give valid values. +the hardware so that they give valid values. + +:: int (*open)(struct gameport *, int mode); @@ -172,16 +201,22 @@ Second, resource allocation can happen here. The port can also be enabled here. Prior to this call, other fields of the gameport struct (namely the io member) need not to be valid. +:: + void (*close)(struct gameport *); Close() should free the resources allocated by open, possibly disabling the gameport. +:: + struct gameport_dev *dev; struct gameport *next; For internal use by the gameport layer. -}; +:: + + }; Enjoy! -- cgit v1.2.3