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linux-stable/drivers/gpio/gpio-idio-16.h

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gpio: idio-16: Introduce the ACCES IDIO-16 GPIO library module Exposes consumer library functions to facilitate communication with devices within the ACCES IDIO-16 family such as the 104-IDIO-16 and the PCI-IDIO-16. A CONFIG_GPIO_IDIO_16 Kconfig option is introduced by this patch. Modules wanting access to these idio-16 library functions should select this Kconfig option and import the GPIO_IDIO_16 symbol namespace. Cc: Andy Shevchenko <andriy.shevchenko@intel.com> Signed-off-by: William Breathitt Gray <william.gray@linaro.org> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-09-18 16:50:43 +00:00
/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright 2022 William Breathitt Gray */
#ifndef _IDIO_16_H_
#define _IDIO_16_H_
gpio: idio-16: Migrate to the regmap API The regmap API supports IO port accessors so we can take advantage of regmap abstractions rather than handling access to the device registers directly in the driver. By leveraging the regmap API, the idio-16 library is reduced to simply a devm_idio_16_regmap_register() function and a configuration structure struct idio_16_regmap_config. Legacy functions and code will be removed once all consumers have migrated to the new idio-16 library interface. For IDIO-16 devices we have the following IRQ registers: Base Address +1 (Write): Clear Interrupt Base Address +2 (Read): Enable Interrupt Base Address +2 (Write): Disable Interrupt An interrupt is asserted whenever a change-of-state is detected on any of the inputs. Any write to 0x2 will disable interrupts, while any read will enable interrupts. Interrupts are cleared by a write to 0x1. For 104-IDIO-16 devices, there is no IRQ status register, so software has to assume that if an interrupt is raised then it was for the 104-IDIO-16 device. For PCI-IDIO-16 devices, there is an additional IRQ register: Base Address +6 (Read): Interrupt Status Interrupt status can be read from 0x6 where bit 2 set indicates that an IRQ has been generated. Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/b45081958ab53dfa697f4a8b15f1bfba46718068.1680618405.git.william.gray@linaro.org/ Signed-off-by: William Breathitt Gray <william.gray@linaro.org> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2023-08-10 22:00:38 +00:00
struct device;
struct regmap;
struct regmap_irq;
/**
* struct idio_16_regmap_config - Configuration for the IDIO-16 register map
* @parent: parent device
* @map: regmap for the IDIO-16 device
* @regmap_irqs: descriptors for individual IRQs
* @num_regmap_irqs: number of IRQ descriptors
* @irq: IRQ number for the IDIO-16 device
* @no_status: device has no status register
* @filters: device has input filters
*/
struct idio_16_regmap_config {
struct device *parent;
struct regmap *map;
const struct regmap_irq *regmap_irqs;
int num_regmap_irqs;
unsigned int irq;
bool no_status;
bool filters;
};
int devm_idio_16_regmap_register(struct device *dev, const struct idio_16_regmap_config *config);
gpio: idio-16: Introduce the ACCES IDIO-16 GPIO library module Exposes consumer library functions to facilitate communication with devices within the ACCES IDIO-16 family such as the 104-IDIO-16 and the PCI-IDIO-16. A CONFIG_GPIO_IDIO_16 Kconfig option is introduced by this patch. Modules wanting access to these idio-16 library functions should select this Kconfig option and import the GPIO_IDIO_16 symbol namespace. Cc: Andy Shevchenko <andriy.shevchenko@intel.com> Signed-off-by: William Breathitt Gray <william.gray@linaro.org> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-09-18 16:50:43 +00:00
#endif /* _IDIO_16_H_ */
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