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![Linus Torvalds](/assets/img/avatar_default.png)
Core changes - Return NULL from gpiod_get_optional() when GPIOLIB is disabled. This was a much discussed change. It affects use cases where people write drivers that might or might not be using GPIO resources. I have decided that this is the lesser evil right now. - Make gpiod_count() behave consistently across different hardware descriptions. - Fix the syntax around open drain/open source to not infer active high/low semantics. New drivers - A new single-register fixed-direction framework driver for hardware that have lines controlled by a single register that just work in one direction (out or in), including IRQ support. - Support the Fintek F71889A GPIO SuperIO controller. - Support the National NI 169445 MMIO GPIO. - Support for the X-Gene derivative of the DWC GPIO controller - Support for the Rohm BD9571MWV-M PMIC GPIO controller. - Refactor the Gemini GPIO driver to a generic Faraday FTGPIO driver and replace both the Gemini and the Moxa ART custom drivers with this driver. Driver improvements - A whole slew of drivers have their spinlocks chaned to raw spinlocks as they provide irqchips, and thus we are progressing on realtime compliance. - Use devm_irq_alloc_descs() in a slew of drivers, getting managed resources. - Support for the embedded PWM controller inside the MVEBU driver. - Debounce, open source and open drain support for the Aspeed driver. - Misc smaller fixes like spelling and syntax and whatnot. -----BEGIN PGP SIGNATURE----- iQIcBAABAgAGBQJZCusBAAoJEEEQszewGV1zengP/i3YgmSXJdaf26t/NxG3klU3 qx3akdQ3gEQ6BOlIY7Ew+b6qgMJynYNZa1trZgqTgLxPEKWjidyCgz+LHQ0OY+ir a7x6wr+gBj5WlgV+nBjVs4l6W8pVKCfnap/04OPEQDpxZOHs2LU5pqxxUZ9AxkKS urDFMDX55baFviQ+xAuHgamok87YoGP36A/e/fHIBepZmnochf0mCcPfIh0t8lRh s2x29PN5ZFRkl403RzjZfVCEMr9bMnSqmDquvPO++Kq0bL+3rOhuMErocd1Bg8ao LxBktkryujTaw699xK7Rq5SwcnOAPpaBY4NTmwsIJvAJuCh7qLy9JxQSBsSOT2bx 61NWUt5T/Xsi0ECYZM4YvsNpUP6XrpSTyG3c8T3fY9vXYLNKZBv1ht6OODpLeuke DxULAWP+DdzUS8a3qfKQvIJzSTloU31a1MBG58DWNJ072EQfa2YNaVE75VQk/z5/ 0xZbSHdPY/0Xgx8ltpKu37bSO676JiVQZZ1HEAuti4h21+USYueYD2L8/Bx4k9e/ 4UaOcw3MaCDHP/sf5hg17kQBjhhS0lV9Zv6H9QbHZUocJTJlIU+vXtgkQlrfi3n8 8j5m+ywVarmLtPqg1j2rqcw7LBCPe0qRXH3e5X/YmNMc3rH9bQz4cTo8ZSN9r8zS c17zGbbAqlGsBkpFAbQz =DGPb -----END PGP SIGNATURE----- Merge tag 'gpio-v4.12-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio Pull GPIO updates from Linus Walleij: "This is the bulk of GPIO changes for the v4.12 kernel cycle. Core changes: - Return NULL from gpiod_get_optional() when GPIOLIB is disabled. This was a much discussed change. It affects use cases where people write drivers that might or might not be using GPIO resources. I have decided that this is the lesser evil right now. - Make gpiod_count() behave consistently across different hardware descriptions. - Fix the syntax around open drain/open source to not infer active high/low semantics. New drivers: - A new single-register fixed-direction framework driver for hardware that have lines controlled by a single register that just work in one direction (out or in), including IRQ support. - Support the Fintek F71889A GPIO SuperIO controller. - Support the National NI 169445 MMIO GPIO. - Support for the X-Gene derivative of the DWC GPIO controller - Support for the Rohm BD9571MWV-M PMIC GPIO controller. - Refactor the Gemini GPIO driver to a generic Faraday FTGPIO driver and replace both the Gemini and the Moxa ART custom drivers with this driver. Driver improvements: - A whole slew of drivers have their spinlocks chaned to raw spinlocks as they provide irqchips, and thus we are progressing on realtime compliance. - Use devm_irq_alloc_descs() in a slew of drivers, getting managed resources. - Support for the embedded PWM controller inside the MVEBU driver. - Debounce, open source and open drain support for the Aspeed driver. - Misc smaller fixes like spelling and syntax and whatnot" * tag 'gpio-v4.12-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio: (77 commits) gpio: f7188x: Add a missing break gpio: omap: return error if requested debounce time is not possible gpio: Add ROHM BD9571MWV-M PMIC GPIO driver gpio: gpio-wcove: fix GPIO IRQ status mask gpio: DT bindings, move tca9554 from pcf857x to pca953x gpio: move tca9554 from pcf857x to pca953x gpio: arizona: Correct check whether the pin is an input gpio: Add XRA1403 DTS binding documentation dt-bindings: add exar to vendor prefixes list gpio: gpio-wcove: fix irq pending status bit width gpio: dwapb: use dwapb_read instead of readl_relaxed gpio: aspeed: Add open-source and open-drain support gpio: aspeed: Add debounce support gpio: aspeed: dt: Add optional clocks property gpio: aspeed: dt: Fix description alignment in bindings document gpio: mvebu: Add limited PWM support gpio: Use unsigned int for interrupt numbers gpio: f7188x: Add F71889A GPIO support. gpio: core: Decouple open drain/source flag with active low/high gpio: arizona: Correct handling for reading input GPIOs ...
478 lines
13 KiB
C
478 lines
13 KiB
C
#ifndef __LINUX_GPIO_CONSUMER_H
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#define __LINUX_GPIO_CONSUMER_H
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#include <linux/bug.h>
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#include <linux/err.h>
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#include <linux/kernel.h>
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struct device;
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/**
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* Opaque descriptor for a GPIO. These are obtained using gpiod_get() and are
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* preferable to the old integer-based handles.
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*
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* Contrary to integers, a pointer to a gpio_desc is guaranteed to be valid
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* until the GPIO is released.
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*/
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struct gpio_desc;
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/**
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* Struct containing an array of descriptors that can be obtained using
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* gpiod_get_array().
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*/
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struct gpio_descs {
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unsigned int ndescs;
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struct gpio_desc *desc[];
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};
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#define GPIOD_FLAGS_BIT_DIR_SET BIT(0)
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#define GPIOD_FLAGS_BIT_DIR_OUT BIT(1)
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#define GPIOD_FLAGS_BIT_DIR_VAL BIT(2)
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/**
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* Optional flags that can be passed to one of gpiod_* to configure direction
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* and output value. These values cannot be OR'd.
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*/
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enum gpiod_flags {
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GPIOD_ASIS = 0,
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GPIOD_IN = GPIOD_FLAGS_BIT_DIR_SET,
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GPIOD_OUT_LOW = GPIOD_FLAGS_BIT_DIR_SET | GPIOD_FLAGS_BIT_DIR_OUT,
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GPIOD_OUT_HIGH = GPIOD_FLAGS_BIT_DIR_SET | GPIOD_FLAGS_BIT_DIR_OUT |
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GPIOD_FLAGS_BIT_DIR_VAL,
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};
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#ifdef CONFIG_GPIOLIB
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/* Return the number of GPIOs associated with a device / function */
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int gpiod_count(struct device *dev, const char *con_id);
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/* Acquire and dispose GPIOs */
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struct gpio_desc *__must_check gpiod_get(struct device *dev,
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const char *con_id,
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enum gpiod_flags flags);
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struct gpio_desc *__must_check gpiod_get_index(struct device *dev,
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const char *con_id,
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unsigned int idx,
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enum gpiod_flags flags);
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struct gpio_desc *__must_check gpiod_get_optional(struct device *dev,
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const char *con_id,
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enum gpiod_flags flags);
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struct gpio_desc *__must_check gpiod_get_index_optional(struct device *dev,
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const char *con_id,
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unsigned int index,
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enum gpiod_flags flags);
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struct gpio_descs *__must_check gpiod_get_array(struct device *dev,
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const char *con_id,
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enum gpiod_flags flags);
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struct gpio_descs *__must_check gpiod_get_array_optional(struct device *dev,
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const char *con_id,
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enum gpiod_flags flags);
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void gpiod_put(struct gpio_desc *desc);
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void gpiod_put_array(struct gpio_descs *descs);
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struct gpio_desc *__must_check devm_gpiod_get(struct device *dev,
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const char *con_id,
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enum gpiod_flags flags);
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struct gpio_desc *__must_check devm_gpiod_get_index(struct device *dev,
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const char *con_id,
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unsigned int idx,
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enum gpiod_flags flags);
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struct gpio_desc *__must_check devm_gpiod_get_optional(struct device *dev,
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const char *con_id,
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enum gpiod_flags flags);
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struct gpio_desc *__must_check
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devm_gpiod_get_index_optional(struct device *dev, const char *con_id,
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unsigned int index, enum gpiod_flags flags);
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struct gpio_descs *__must_check devm_gpiod_get_array(struct device *dev,
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const char *con_id,
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enum gpiod_flags flags);
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struct gpio_descs *__must_check
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devm_gpiod_get_array_optional(struct device *dev, const char *con_id,
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enum gpiod_flags flags);
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void devm_gpiod_put(struct device *dev, struct gpio_desc *desc);
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void devm_gpiod_put_array(struct device *dev, struct gpio_descs *descs);
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int gpiod_get_direction(struct gpio_desc *desc);
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int gpiod_direction_input(struct gpio_desc *desc);
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int gpiod_direction_output(struct gpio_desc *desc, int value);
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int gpiod_direction_output_raw(struct gpio_desc *desc, int value);
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/* Value get/set from non-sleeping context */
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int gpiod_get_value(const struct gpio_desc *desc);
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void gpiod_set_value(struct gpio_desc *desc, int value);
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void gpiod_set_array_value(unsigned int array_size,
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struct gpio_desc **desc_array, int *value_array);
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int gpiod_get_raw_value(const struct gpio_desc *desc);
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void gpiod_set_raw_value(struct gpio_desc *desc, int value);
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void gpiod_set_raw_array_value(unsigned int array_size,
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struct gpio_desc **desc_array,
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int *value_array);
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/* Value get/set from sleeping context */
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int gpiod_get_value_cansleep(const struct gpio_desc *desc);
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void gpiod_set_value_cansleep(struct gpio_desc *desc, int value);
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void gpiod_set_array_value_cansleep(unsigned int array_size,
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struct gpio_desc **desc_array,
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int *value_array);
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int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc);
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void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value);
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void gpiod_set_raw_array_value_cansleep(unsigned int array_size,
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struct gpio_desc **desc_array,
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int *value_array);
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int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce);
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int gpiod_is_active_low(const struct gpio_desc *desc);
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int gpiod_cansleep(const struct gpio_desc *desc);
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int gpiod_to_irq(const struct gpio_desc *desc);
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/* Convert between the old gpio_ and new gpiod_ interfaces */
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struct gpio_desc *gpio_to_desc(unsigned gpio);
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int desc_to_gpio(const struct gpio_desc *desc);
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/* Child properties interface */
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struct fwnode_handle;
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struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode,
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const char *propname, int index,
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enum gpiod_flags dflags,
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const char *label);
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struct gpio_desc *devm_fwnode_get_index_gpiod_from_child(struct device *dev,
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const char *con_id, int index,
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struct fwnode_handle *child,
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enum gpiod_flags flags,
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const char *label);
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#else /* CONFIG_GPIOLIB */
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static inline int gpiod_count(struct device *dev, const char *con_id)
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{
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return 0;
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}
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static inline struct gpio_desc *__must_check gpiod_get(struct device *dev,
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const char *con_id,
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enum gpiod_flags flags)
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{
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return ERR_PTR(-ENOSYS);
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}
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static inline struct gpio_desc *__must_check
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gpiod_get_index(struct device *dev,
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const char *con_id,
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unsigned int idx,
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enum gpiod_flags flags)
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{
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return ERR_PTR(-ENOSYS);
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}
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static inline struct gpio_desc *__must_check
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gpiod_get_optional(struct device *dev, const char *con_id,
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enum gpiod_flags flags)
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{
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return NULL;
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}
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static inline struct gpio_desc *__must_check
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gpiod_get_index_optional(struct device *dev, const char *con_id,
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unsigned int index, enum gpiod_flags flags)
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{
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return NULL;
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}
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static inline struct gpio_descs *__must_check
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gpiod_get_array(struct device *dev, const char *con_id,
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enum gpiod_flags flags)
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{
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return ERR_PTR(-ENOSYS);
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}
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static inline struct gpio_descs *__must_check
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gpiod_get_array_optional(struct device *dev, const char *con_id,
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enum gpiod_flags flags)
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{
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return NULL;
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}
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static inline void gpiod_put(struct gpio_desc *desc)
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{
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might_sleep();
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/* GPIO can never have been requested */
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WARN_ON(1);
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}
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static inline void gpiod_put_array(struct gpio_descs *descs)
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{
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might_sleep();
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/* GPIO can never have been requested */
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WARN_ON(1);
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}
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static inline struct gpio_desc *__must_check
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devm_gpiod_get(struct device *dev,
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const char *con_id,
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enum gpiod_flags flags)
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{
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return ERR_PTR(-ENOSYS);
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}
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static inline
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struct gpio_desc *__must_check
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devm_gpiod_get_index(struct device *dev,
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const char *con_id,
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unsigned int idx,
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enum gpiod_flags flags)
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{
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return ERR_PTR(-ENOSYS);
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}
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static inline struct gpio_desc *__must_check
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devm_gpiod_get_optional(struct device *dev, const char *con_id,
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enum gpiod_flags flags)
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{
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return NULL;
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}
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static inline struct gpio_desc *__must_check
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devm_gpiod_get_index_optional(struct device *dev, const char *con_id,
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unsigned int index, enum gpiod_flags flags)
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{
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return NULL;
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}
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static inline struct gpio_descs *__must_check
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devm_gpiod_get_array(struct device *dev, const char *con_id,
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enum gpiod_flags flags)
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{
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return ERR_PTR(-ENOSYS);
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}
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static inline struct gpio_descs *__must_check
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devm_gpiod_get_array_optional(struct device *dev, const char *con_id,
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enum gpiod_flags flags)
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{
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return NULL;
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}
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static inline void devm_gpiod_put(struct device *dev, struct gpio_desc *desc)
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{
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might_sleep();
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/* GPIO can never have been requested */
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WARN_ON(1);
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}
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static inline void devm_gpiod_put_array(struct device *dev,
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struct gpio_descs *descs)
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{
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might_sleep();
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/* GPIO can never have been requested */
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WARN_ON(1);
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}
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static inline int gpiod_get_direction(const struct gpio_desc *desc)
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{
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/* GPIO can never have been requested */
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WARN_ON(1);
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return -ENOSYS;
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}
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static inline int gpiod_direction_input(struct gpio_desc *desc)
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{
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/* GPIO can never have been requested */
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WARN_ON(1);
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return -ENOSYS;
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}
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static inline int gpiod_direction_output(struct gpio_desc *desc, int value)
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{
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/* GPIO can never have been requested */
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WARN_ON(1);
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return -ENOSYS;
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}
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static inline int gpiod_direction_output_raw(struct gpio_desc *desc, int value)
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{
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/* GPIO can never have been requested */
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WARN_ON(1);
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return -ENOSYS;
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}
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static inline int gpiod_get_value(const struct gpio_desc *desc)
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{
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/* GPIO can never have been requested */
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WARN_ON(1);
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return 0;
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}
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static inline void gpiod_set_value(struct gpio_desc *desc, int value)
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{
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/* GPIO can never have been requested */
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WARN_ON(1);
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}
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static inline void gpiod_set_array_value(unsigned int array_size,
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struct gpio_desc **desc_array,
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int *value_array)
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{
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/* GPIO can never have been requested */
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WARN_ON(1);
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}
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static inline int gpiod_get_raw_value(const struct gpio_desc *desc)
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{
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/* GPIO can never have been requested */
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WARN_ON(1);
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return 0;
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}
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static inline void gpiod_set_raw_value(struct gpio_desc *desc, int value)
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{
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/* GPIO can never have been requested */
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WARN_ON(1);
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}
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static inline void gpiod_set_raw_array_value(unsigned int array_size,
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struct gpio_desc **desc_array,
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int *value_array)
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{
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/* GPIO can never have been requested */
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WARN_ON(1);
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}
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static inline int gpiod_get_value_cansleep(const struct gpio_desc *desc)
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{
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/* GPIO can never have been requested */
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WARN_ON(1);
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return 0;
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}
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static inline void gpiod_set_value_cansleep(struct gpio_desc *desc, int value)
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{
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/* GPIO can never have been requested */
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WARN_ON(1);
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}
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static inline void gpiod_set_array_value_cansleep(unsigned int array_size,
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struct gpio_desc **desc_array,
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int *value_array)
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{
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/* GPIO can never have been requested */
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WARN_ON(1);
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}
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static inline int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc)
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{
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/* GPIO can never have been requested */
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WARN_ON(1);
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return 0;
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}
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static inline void gpiod_set_raw_value_cansleep(struct gpio_desc *desc,
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int value)
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{
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/* GPIO can never have been requested */
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WARN_ON(1);
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}
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static inline void gpiod_set_raw_array_value_cansleep(unsigned int array_size,
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struct gpio_desc **desc_array,
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int *value_array)
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{
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/* GPIO can never have been requested */
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WARN_ON(1);
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}
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static inline int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce)
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{
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/* GPIO can never have been requested */
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WARN_ON(1);
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return -ENOSYS;
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}
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static inline int gpiod_is_active_low(const struct gpio_desc *desc)
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{
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/* GPIO can never have been requested */
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WARN_ON(1);
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return 0;
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}
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static inline int gpiod_cansleep(const struct gpio_desc *desc)
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{
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/* GPIO can never have been requested */
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WARN_ON(1);
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return 0;
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}
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static inline int gpiod_to_irq(const struct gpio_desc *desc)
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{
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/* GPIO can never have been requested */
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WARN_ON(1);
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return -EINVAL;
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}
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static inline struct gpio_desc *gpio_to_desc(unsigned gpio)
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{
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return ERR_PTR(-EINVAL);
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}
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static inline int desc_to_gpio(const struct gpio_desc *desc)
|
|
{
|
|
/* GPIO can never have been requested */
|
|
WARN_ON(1);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Child properties interface */
|
|
struct fwnode_handle;
|
|
|
|
static inline
|
|
struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode,
|
|
const char *propname, int index,
|
|
enum gpiod_flags dflags,
|
|
const char *label)
|
|
{
|
|
return ERR_PTR(-ENOSYS);
|
|
}
|
|
|
|
static inline
|
|
struct gpio_desc *devm_fwnode_get_index_gpiod_from_child(struct device *dev,
|
|
const char *con_id, int index,
|
|
struct fwnode_handle *child,
|
|
enum gpiod_flags flags,
|
|
const char *label)
|
|
{
|
|
return ERR_PTR(-ENOSYS);
|
|
}
|
|
|
|
#endif /* CONFIG_GPIOLIB */
|
|
|
|
static inline
|
|
struct gpio_desc *devm_fwnode_get_gpiod_from_child(struct device *dev,
|
|
const char *con_id,
|
|
struct fwnode_handle *child,
|
|
enum gpiod_flags flags,
|
|
const char *label)
|
|
{
|
|
return devm_fwnode_get_index_gpiod_from_child(dev, con_id, 0, child,
|
|
flags, label);
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_GPIOLIB) && IS_ENABLED(CONFIG_GPIO_SYSFS)
|
|
|
|
int gpiod_export(struct gpio_desc *desc, bool direction_may_change);
|
|
int gpiod_export_link(struct device *dev, const char *name,
|
|
struct gpio_desc *desc);
|
|
void gpiod_unexport(struct gpio_desc *desc);
|
|
|
|
#else /* CONFIG_GPIOLIB && CONFIG_GPIO_SYSFS */
|
|
|
|
static inline int gpiod_export(struct gpio_desc *desc,
|
|
bool direction_may_change)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
static inline int gpiod_export_link(struct device *dev, const char *name,
|
|
struct gpio_desc *desc)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
static inline void gpiod_unexport(struct gpio_desc *desc)
|
|
{
|
|
}
|
|
|
|
#endif /* CONFIG_GPIOLIB && CONFIG_GPIO_SYSFS */
|
|
|
|
#endif
|