Lines Matching +full:inactive +full:- +full:high +full:- +full:impedance
21 - Simple compile coverage with e.g. COMPILE_TEST - it does not matter that
25 - Truly optional GPIOLIB support - where the driver does not really make use
26 of the GPIOs on certain compile-time configurations for certain systems, but
27 will use it under other compile-time configurations. In this case the
35 All the functions that work with the descriptor-based GPIO interface are
45 With the descriptor-based interface, GPIOs are identified with an opaque,
46 non-forgeable handler that must be obtained through a call to one of the
62 see Documentation/driver-api/gpio/board.rst
78 whether the line is configured active high or active low (see
87 with IS_ERR() (they will never return a NULL pointer). -ENOENT will be returned
94 instead of -ENOENT if no GPIO has been assigned to the requested function::
108 -ENOSYS return codes. System integrators should however be careful to enable
127 The following function returns NULL instead of -ENOENT if no GPIOs have been
134 Device-managed variants of these functions are also defined::
173 The device-managed variants are, unsurprisingly::
184 -----------------
186 direction-setting flags have been given to gpiod_get*(), this is done by
195 for spinlock-safe GPIOs it is OK to use them before tasking is enabled, as part
212 Spinlock-Safe GPIO Access
213 -------------------------
215 don't need to sleep, and can safely be done from inside hard (non-threaded) IRQ
223 The values are boolean, zero for inactive, nonzero for active. When reading the
226 open-drain signaling and output latencies.
236 --------------------------
253 IRQ handler, and those accessors must be used instead of spinlock-safe
258 spinlock-safe calls.
264 ---------------------------------------
273 actively drive their output high (open drain) or low (open source), they just
274 switch their output to a high impedance value. The consumer should not need to
278 parameter "value" as "active" ("1") or "inactive" ("0"). The physical line
289 gpiod_set_raw_value(desc, 1); don't care high
290 gpiod_set_value(desc, 0); default (active high) low
291 gpiod_set_value(desc, 1); default (active high) high
292 gpiod_set_value(desc, 0); active low high
295 gpiod_set_value(desc, 1); open drain high impedance
296 gpiod_set_value(desc, 0); open source high impedance
297 gpiod_set_value(desc, 1); open source high
300 but it should be avoided as much as possible, especially by system-agnostic drivers
306 -------------------------
311 The following set of calls ignore the active-low or open drain property of a GPIO and
331 -------------------------------------------------
376 * array_size - the number of array elements
377 * desc_array - an array of GPIO descriptors
378 * array_info - optional information obtained from gpiod_get_array()
379 * value_bitmap - a bitmap to store the GPIOs' values (get) or
388 gpiod_set_array_value(my_gpio_descs->ndescs, my_gpio_descs->desc,
389 my_gpio_descs->info, my_gpio_value_bitmap);
415 --------------------
427 Non-error values returned from gpiod_to_irq() can be passed to request_irq() or
429 by the board-specific initialization code. Note that IRQ trigger options are
449 For details refer to Documentation/firmware-guide/acpi/gpio-properties.rst
455 integer-based interface. It is strongly recommended to update these to the new
458 and vice-versa::