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/*
* Copyright 2020 Google LLC
*
* SPDX-License-Identifier: Apache-2.0
*/
/**
* @file
* @brief Chrome OS-specific API for raw keyboard access
* This exists only support the interface expected by the Chrome OS EC. It seems
* better to implement this so we can make use of most of the existing code in
* its keyboard_scan.c file and thus make sure we operate the same way.
*
* It provides raw access to keyboard GPIOs.
*
* The keyboard matrix is read (by the caller, keyboard_scan.c in ECOS) by
* driving output signals on the column lines and reading the row lines.
*
* This API and any drivers should be removed once we can safely move to using
* the Zephyr kscan API.
*/
#ifndef ZEPHYR_INCLUDE_DRIVERS_CROS_KB_RAW_H_
#define ZEPHYR_INCLUDE_DRIVERS_CROS_KB_RAW_H_
#include <kernel.h>
#include <device.h>
/**
* @brief CROS Keyboard Raw Driver APIs
* @defgroup cros_kb_raw_interface CROS Keyboard Raw Driver APIs
* @ingroup io_interfaces
* @{
*/
/**
* @cond INTERNAL_HIDDEN
*
* cros keyboard raw driver API definition and system call entry points
*
* (Internal use only.)
*/
typedef int (*cros_kb_raw_api_init)(const struct device *dev);
typedef int (*cros_kb_raw_api_drive_column)(const struct device *dev, int col);
typedef int (*cros_kb_raw_api_read_rows)(const struct device *dev);
typedef int (*cros_kb_raw_api_enable_interrupt)(const struct device *dev,
int enable);
__subsystem struct cros_kb_raw_driver_api {
cros_kb_raw_api_init init;
cros_kb_raw_api_drive_column drive_colum;
cros_kb_raw_api_read_rows read_rows;
cros_kb_raw_api_enable_interrupt enable_interrupt;
};
/**
* @endcond
*/
/**
* @brief Initialize the raw keyboard interface.
*
* Must be called before any other functions in this interface.
*
* @param dev Pointer to the device structure for the keyboard driver instance.
*
* @return 0 If successful.
* @retval -ENOTSUP Not supported api function.
*/
__syscall int cros_kb_raw_init(const struct device *dev);
static inline int z_impl_cros_kb_raw_init(const struct device *dev)
{
const struct cros_kb_raw_driver_api *api =
(const struct cros_kb_raw_driver_api *)dev->api;
if (!api->init) {
return -ENOTSUP;
}
return api->init(dev);
}
/**
* @brief Drive the specified column low.
*
* Other columns are tristated. See enum keyboard_column_index for special
* values for <col>.
*
* @param dev Pointer to the device structure for the keyboard driver instance.
* @param col Specified column is driven to low.
*
* @return 0 If successful.
* @retval -ENOTSUP Not supported api function.
*/
__syscall int cros_kb_raw_drive_column(const struct device *dev, int col);
static inline int z_impl_cros_kb_raw_drive_column(const struct device *dev,
int col)
{
const struct cros_kb_raw_driver_api *api =
(const struct cros_kb_raw_driver_api *)dev->api;
if (!api->drive_colum) {
return -ENOTSUP;
}
return api->drive_colum(dev, col);
}
/**
* @brief Read raw row state.
*
* Bits are 1 if signal is present, 0 if not present.
*
* @param dev Pointer to the device structure for the keyboard driver instance.
*
* @return current raw row state value.
*/
__syscall int cros_kb_raw_read_rows(const struct device *dev);
static inline int z_impl_cros_kb_raw_read_rows(const struct device *dev)
{
const struct cros_kb_raw_driver_api *api =
(const struct cros_kb_raw_driver_api *)dev->api;
if (!api->read_rows) {
return 0;
}
return api->read_rows(dev);
}
/**
* @brief Enable or disable keyboard interrupts.
*
* Enabling interrupts will clear any pending interrupt bits. To avoid missing
* any interrupts that occur between the end of scanning and then, you should
* call cros_kb_raw_read_rows() after this. If it returns non-zero, disable
* interrupts and go back to polling mode instead of waiting for an interrupt.
*
* @param dev Pointer to the device structure for the keyboard driver instance.
* @param enable If 1, enable keyboard interrupt. Otherwise, disable it.
*
* @return 0 If successful.
* @retval -ENOTSUP Not supported api function.
*/
__syscall int cros_kb_raw_enable_interrupt(const struct device *dev,
int enable);
static inline int z_impl_cros_kb_raw_enable_interrupt(const struct device *dev,
int enable)
{
const struct cros_kb_raw_driver_api *api =
(const struct cros_kb_raw_driver_api *)dev->api;
if (!api->enable_interrupt) {
return -ENOTSUP;
}
return api->enable_interrupt(dev, enable);
}
/**
* @}
*/
#include <syscalls/cros_kb_raw.h>
#endif /* ZEPHYR_INCLUDE_DRIVERS_CROS_KB_RAW_H_ */
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