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Linux/Documentation/admin-guide/gpio/gpio-mockup.rst

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Diff markup

Differences between /Documentation/admin-guide/gpio/gpio-mockup.rst (Architecture alpha) and /Documentation/admin-guide/gpio/gpio-mockup.rst (Architecture sparc64)


  1 .. SPDX-License-Identifier: GPL-2.0-only            1 .. SPDX-License-Identifier: GPL-2.0-only
  2                                                     2 
  3 GPIO Testing Driver                                 3 GPIO Testing Driver
  4 ===================                                 4 ===================
  5                                                     5 
  6 .. note::                                           6 .. note::
  7                                                     7 
  8    This module has been obsoleted by the more       8    This module has been obsoleted by the more flexible gpio-sim.rst.
  9    New developments should use that API and ex      9    New developments should use that API and existing developments are
 10    encouraged to migrate as soon as possible.      10    encouraged to migrate as soon as possible.
 11    This module will continue to be maintained      11    This module will continue to be maintained but no new features will be
 12    added.                                          12    added.
 13                                                    13 
 14 The GPIO Testing Driver (gpio-mockup) provides     14 The GPIO Testing Driver (gpio-mockup) provides a way to create simulated GPIO
 15 chips for testing purposes. The lines exposed      15 chips for testing purposes. The lines exposed by these chips can be accessed
 16 using the standard GPIO character device inter     16 using the standard GPIO character device interface as well as manipulated
 17 using the dedicated debugfs directory structur     17 using the dedicated debugfs directory structure.
 18                                                    18 
 19 Creating simulated chips using module params       19 Creating simulated chips using module params
 20 --------------------------------------------       20 --------------------------------------------
 21                                                    21 
 22 When loading the gpio-mockup driver a number o     22 When loading the gpio-mockup driver a number of parameters can be passed to the
 23 module.                                            23 module.
 24                                                    24 
 25     gpio_mockup_ranges                             25     gpio_mockup_ranges
 26                                                    26 
 27         This parameter takes an argument in th     27         This parameter takes an argument in the form of an array of integer
 28         pairs. Each pair defines the base GPIO     28         pairs. Each pair defines the base GPIO number (non-negative integer)
 29         and the first number after the last of     29         and the first number after the last of this chip. If the base GPIO
 30         is -1, the gpiolib will assign it auto     30         is -1, the gpiolib will assign it automatically. while the following
 31         parameter is the number of lines expos     31         parameter is the number of lines exposed by the chip.
 32                                                    32 
 33         Example: gpio_mockup_ranges=-1,8,-1,16     33         Example: gpio_mockup_ranges=-1,8,-1,16,405,409
 34                                                    34 
 35         The line above creates three chips. Th     35         The line above creates three chips. The first one will expose 8 lines,
 36         the second 16 and the third 4. The bas     36         the second 16 and the third 4. The base GPIO for the third chip is set
 37         to 405 while for two first chips it wi     37         to 405 while for two first chips it will be assigned automatically.
 38                                                    38 
 39     gpio_mockup_named_lines                        39     gpio_mockup_named_lines
 40                                                    40 
 41         This parameter doesn't take any argume     41         This parameter doesn't take any arguments. It lets the driver know that
 42         GPIO lines exposed by it should be nam     42         GPIO lines exposed by it should be named.
 43                                                    43 
 44         The name format is: gpio-mockup-X-Y wh     44         The name format is: gpio-mockup-X-Y where X is mockup chip's ID
 45         and Y is the line offset.                  45         and Y is the line offset.
 46                                                    46 
 47 Manipulating simulated lines                       47 Manipulating simulated lines
 48 ----------------------------                       48 ----------------------------
 49                                                    49 
 50 Each mockup chip creates its own subdirectory      50 Each mockup chip creates its own subdirectory in /sys/kernel/debug/gpio-mockup/.
 51 The directory is named after the chip's label.     51 The directory is named after the chip's label. A symlink is also created, named
 52 after the chip's name, which points to the lab     52 after the chip's name, which points to the label directory.
 53                                                    53 
 54 Inside each subdirectory, there's a separate a     54 Inside each subdirectory, there's a separate attribute for each GPIO line. The
 55 name of the attribute represents the line's of     55 name of the attribute represents the line's offset in the chip.
 56                                                    56 
 57 Reading from a line attribute returns the curr     57 Reading from a line attribute returns the current value. Writing to it (0 or 1)
 58 changes the configuration of the simulated pul     58 changes the configuration of the simulated pull-up/pull-down resistor
 59 (1 - pull-up, 0 - pull-down).                      59 (1 - pull-up, 0 - pull-down).
                                                      

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