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/*
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* Copyright (c) 2020 The ZMK Contributors
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*
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* SPDX-License-Identifier: MIT
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*/
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#define DT_DRV_COMPAT zmk_kscan_gpio_demux
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#include <device.h>
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#include <drivers/kscan.h>
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#include <drivers/gpio.h>
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#include <logging/log.h>
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LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
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struct kscan_gpio_item_config {
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char *label;
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gpio_pin_t pin;
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gpio_flags_t flags;
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};
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// Helper macro
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#define PWR_TWO(x) (1 << (x))
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// Define GPIO cfg
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#define _KSCAN_GPIO_ITEM_CFG_INIT(n, prop, idx) \
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{ \
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.label = DT_INST_GPIO_LABEL_BY_IDX(n, prop, idx), \
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.pin = DT_INST_GPIO_PIN_BY_IDX(n, prop, idx), \
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.flags = DT_INST_GPIO_FLAGS_BY_IDX(n, prop, idx), \
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},
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// Define row and col cfg
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#define _KSCAN_GPIO_INPUT_CFG_INIT(idx, n) _KSCAN_GPIO_ITEM_CFG_INIT(n, input_gpios, idx)
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#define _KSCAN_GPIO_OUTPUT_CFG_INIT(idx, n) _KSCAN_GPIO_ITEM_CFG_INIT(n, output_gpios, idx)
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// Check debounce config
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#define CHECK_DEBOUNCE_CFG(n, a, b) COND_CODE_0(DT_INST_PROP(n, debounce_period), a, b)
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// Define the row and column lengths
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#define INST_MATRIX_INPUTS(n) DT_INST_PROP_LEN(n, input_gpios)
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#define INST_DEMUX_GPIOS(n) DT_INST_PROP_LEN(n, output_gpios)
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#define INST_MATRIX_OUTPUTS(n) PWR_TWO(INST_DEMUX_GPIOS(n))
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#define POLL_INTERVAL(n) DT_INST_PROP(n, polling_interval_msec)
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#define GPIO_INST_INIT(n) \
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struct kscan_gpio_irq_callback_##n { \
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struct CHECK_DEBOUNCE_CFG(n, (k_work), (k_work_delayable)) * work; \
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struct gpio_callback callback; \
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const struct device *dev; \
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}; \
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\
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struct kscan_gpio_config_##n { \
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struct kscan_gpio_item_config rows[INST_MATRIX_INPUTS(n)]; \
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struct kscan_gpio_item_config cols[INST_DEMUX_GPIOS(n)]; \
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}; \
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\
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struct kscan_gpio_data_##n { \
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kscan_callback_t callback; \
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struct k_timer poll_timer; \
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struct CHECK_DEBOUNCE_CFG(n, (k_work), (k_work_delayable)) work; \
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bool matrix_state[INST_MATRIX_INPUTS(n)][INST_MATRIX_OUTPUTS(n)]; \
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const struct device *rows[INST_MATRIX_INPUTS(n)]; \
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const struct device *cols[INST_MATRIX_OUTPUTS(n)]; \
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const struct device *dev; \
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}; \
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/* IO/GPIO SETUP */ \
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/* gpio_input_devices are PHYSICAL IO devices */ \
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static const struct device **kscan_gpio_input_devices_##n(const struct device *dev) { \
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struct kscan_gpio_data_##n *data = dev->data; \
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return data->rows; \
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} \
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\
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static const struct kscan_gpio_item_config *kscan_gpio_input_configs_##n( \
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const struct device *dev) { \
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const struct kscan_gpio_config_##n *cfg = dev->config; \
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return cfg->rows; \
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} \
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\
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/* gpio_output_devices are PHYSICAL IO devices */ \
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static const struct device **kscan_gpio_output_devices_##n(const struct device *dev) { \
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struct kscan_gpio_data_##n *data = dev->data; \
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return data->cols; \
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} \
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\
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static const struct kscan_gpio_item_config *kscan_gpio_output_configs_##n( \
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const struct device *dev) { \
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const struct kscan_gpio_config_##n *cfg = dev->config; \
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/* If row2col, rows = outputs & cols = inputs */ \
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return cfg->cols; \
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} \
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/* POLLING SETUP */ \
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static void kscan_gpio_timer_handler(struct k_timer *timer) { \
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struct kscan_gpio_data_##n *data = \
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CONTAINER_OF(timer, struct kscan_gpio_data_##n, poll_timer); \
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k_work_submit(&data->work.work); \
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} \
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\
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/* Read the state of the input GPIOs */ \
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/* This is the core matrix_scan func */ \
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static int kscan_gpio_read_##n(const struct device *dev) { \
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bool submit_follow_up_read = false; \
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struct kscan_gpio_data_##n *data = dev->data; \
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static bool read_state[INST_MATRIX_INPUTS(n)][INST_MATRIX_OUTPUTS(n)]; \
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for (int o = 0; o < INST_MATRIX_OUTPUTS(n); o++) { \
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/* Iterate over bits and set GPIOs accordingly */ \
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for (uint8_t bit = 0; bit < INST_DEMUX_GPIOS(n); bit++) { \
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uint8_t state = (o & (0b1 << bit)) >> bit; \
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const struct device *out_dev = kscan_gpio_output_devices_##n(dev)[bit]; \
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const struct kscan_gpio_item_config *out_cfg = \
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&kscan_gpio_output_configs_##n(dev)[bit]; \
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gpio_pin_set(out_dev, out_cfg->pin, state); \
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} \
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/* Let the col settle before reading the rows */ \
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k_usleep(1); \
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\
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for (int i = 0; i < INST_MATRIX_INPUTS(n); i++) { \
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/* Get the input device (port) */ \
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const struct device *in_dev = kscan_gpio_input_devices_##n(dev)[i]; \
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/* Get the input device config (pin) */ \
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const struct kscan_gpio_item_config *in_cfg = \
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&kscan_gpio_input_configs_##n(dev)[i]; \
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read_state[i][o] = gpio_pin_get(in_dev, in_cfg->pin) > 0; \
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} \
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} \
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for (int r = 0; r < INST_MATRIX_INPUTS(n); r++) { \
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for (int c = 0; c < INST_MATRIX_OUTPUTS(n); c++) { \
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bool pressed = read_state[r][c]; \
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submit_follow_up_read = (submit_follow_up_read || pressed); \
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if (pressed != data->matrix_state[r][c]) { \
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LOG_DBG("Sending event at %d,%d state %s", r, c, (pressed ? "on" : "off")); \
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data->matrix_state[r][c] = pressed; \
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data->callback(dev, r, c, pressed); \
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} \
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} \
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} \
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if (submit_follow_up_read) { \
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CHECK_DEBOUNCE_CFG(n, ({ k_work_submit(&data->work); }), \
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({ k_work_reschedule(&data->work, K_MSEC(5)); })) \
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} \
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return 0; \
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} \
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\
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static void kscan_gpio_work_handler_##n(struct k_work *work) { \
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struct kscan_gpio_data_##n *data = CONTAINER_OF(work, struct kscan_gpio_data_##n, work); \
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kscan_gpio_read_##n(data->dev); \
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} \
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\
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static struct kscan_gpio_data_##n kscan_gpio_data_##n = { \
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.rows = {[INST_MATRIX_INPUTS(n) - 1] = NULL}, .cols = {[INST_DEMUX_GPIOS(n) - 1] = NULL}}; \
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\
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/* KSCAN API configure function */ \
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static int kscan_gpio_configure_##n(const struct device *dev, kscan_callback_t callback) { \
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LOG_DBG("KSCAN API configure"); \
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struct kscan_gpio_data_##n *data = dev->data; \
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if (!callback) { \
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return -EINVAL; \
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} \
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data->callback = callback; \
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LOG_DBG("Configured GPIO %d", n); \
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return 0; \
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}; \
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\
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/* KSCAN API enable function */ \
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static int kscan_gpio_enable_##n(const struct device *dev) { \
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LOG_DBG("KSCAN API enable"); \
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struct kscan_gpio_data_##n *data = dev->data; \
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/* TODO: we might want a follow up to hook into the sleep state hooks in Zephyr, */ \
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/* and disable this timer when we enter a sleep state */ \
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k_timer_start(&data->poll_timer, K_MSEC(POLL_INTERVAL(n)), K_MSEC(POLL_INTERVAL(n))); \
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return 0; \
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}; \
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\
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/* KSCAN API disable function */ \
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static int kscan_gpio_disable_##n(const struct device *dev) { \
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LOG_DBG("KSCAN API disable"); \
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struct kscan_gpio_data_##n *data = dev->data; \
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k_timer_stop(&data->poll_timer); \
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return 0; \
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}; \
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\
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/* GPIO init function*/ \
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static int kscan_gpio_init_##n(const struct device *dev) { \
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LOG_DBG("KSCAN GPIO init"); \
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struct kscan_gpio_data_##n *data = dev->data; \
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int err; \
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/* configure input devices*/ \
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const struct device **input_devices = kscan_gpio_input_devices_##n(dev); \
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for (int i = 0; i < INST_MATRIX_INPUTS(n); i++) { \
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const struct kscan_gpio_item_config *in_cfg = &kscan_gpio_input_configs_##n(dev)[i]; \
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input_devices[i] = device_get_binding(in_cfg->label); \
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if (!input_devices[i]) { \
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LOG_ERR("Unable to find input GPIO device"); \
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return -EINVAL; \
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} \
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err = gpio_pin_configure(input_devices[i], in_cfg->pin, GPIO_INPUT | in_cfg->flags); \
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if (err) { \
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LOG_ERR("Unable to configure pin %d on %s for input", in_cfg->pin, in_cfg->label); \
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return err; \
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} else { \
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LOG_DBG("Configured pin %d on %s for input", in_cfg->pin, in_cfg->label); \
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} \
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if (err) { \
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LOG_ERR("Error adding the callback to the column device"); \
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return err; \
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} \
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} \
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/* configure output devices*/ \
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const struct device **output_devices = kscan_gpio_output_devices_##n(dev); \
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for (int o = 0; o < INST_DEMUX_GPIOS(n); o++) { \
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const struct kscan_gpio_item_config *out_cfg = &kscan_gpio_output_configs_##n(dev)[o]; \
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output_devices[o] = device_get_binding(out_cfg->label); \
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if (!output_devices[o]) { \
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LOG_ERR("Unable to find output GPIO device"); \
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return -EINVAL; \
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} \
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err = gpio_pin_configure(output_devices[o], out_cfg->pin, \
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GPIO_OUTPUT_ACTIVE | out_cfg->flags); \
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if (err) { \
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LOG_ERR("Unable to configure pin %d on %s for output", out_cfg->pin, \
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out_cfg->label); \
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return err; \
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} else { \
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LOG_DBG("Configured pin %d on %s for output", out_cfg->pin, out_cfg->label); \
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} \
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} \
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data->dev = dev; \
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\
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k_timer_init(&data->poll_timer, kscan_gpio_timer_handler, NULL); \
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\
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(CHECK_DEBOUNCE_CFG(n, (k_work_init), (k_work_init_delayable)))( \
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&data->work, kscan_gpio_work_handler_##n); \
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return 0; \
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} \
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\
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static const struct kscan_driver_api gpio_driver_api_##n = { \
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.config = kscan_gpio_configure_##n, \
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.enable_callback = kscan_gpio_enable_##n, \
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.disable_callback = kscan_gpio_disable_##n, \
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}; \
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\
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static const struct kscan_gpio_config_##n kscan_gpio_config_##n = { \
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.rows = {UTIL_LISTIFY(INST_MATRIX_INPUTS(n), _KSCAN_GPIO_INPUT_CFG_INIT, n)}, \
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.cols = {UTIL_LISTIFY(INST_DEMUX_GPIOS(n), _KSCAN_GPIO_OUTPUT_CFG_INIT, n)}, \
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}; \
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\
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DEVICE_DT_INST_DEFINE(n, kscan_gpio_init_##n, NULL, &kscan_gpio_data_##n, \
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&kscan_gpio_config_##n, APPLICATION, CONFIG_APPLICATION_INIT_PRIORITY, \
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&gpio_driver_api_##n);
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DT_INST_FOREACH_STATUS_OKAY(GPIO_INST_INIT)
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