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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_direct
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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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#if DT_HAS_COMPAT_STATUS_OKAY(DT_DRV_COMPAT)
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struct kscan_gpio_item_config
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{
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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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union work_reference {
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struct k_delayed_work delayed;
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struct k_work direct;
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};
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struct kscan_gpio_config
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{
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u8_t num_of_inputs;
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u8_t debounce_period;
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struct kscan_gpio_item_config inputs[];
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};
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struct kscan_gpio_data
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{
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#if defined(CONFIG_ZMK_KSCAN_GPIO_POLLING)
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struct k_timer poll_timer;
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#endif /* defined(CONFIG_ZMK_KSCAN_GPIO_POLLING) */
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kscan_callback_t callback;
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union work_reference work;
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struct device *dev;
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u32_t pin_state;
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struct device *inputs[];
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};
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static struct device **kscan_gpio_input_devices(struct device *dev)
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{
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struct kscan_gpio_data *data = dev->driver_data;
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return data->inputs;
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}
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static const struct kscan_gpio_item_config *kscan_gpio_input_configs(struct device *dev)
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{
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const struct kscan_gpio_config *cfg = dev->config_info;
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return cfg->inputs;
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}
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#if !defined(CONFIG_ZMK_KSCAN_GPIO_POLLING)
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struct kscan_gpio_irq_callback
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{
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union work_reference *work;
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u8_t debounce_period;
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struct gpio_callback callback;
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};
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static int kscan_gpio_config_interrupts(struct device *dev, gpio_flags_t flags)
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{
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const struct kscan_gpio_config *cfg = dev->config_info;
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struct device **devices = kscan_gpio_input_devices(dev);
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const struct kscan_gpio_item_config *configs = kscan_gpio_input_configs(dev);
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for (int i = 0; i < cfg->num_of_inputs; i++)
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{
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struct device *dev = devices[i];
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const struct kscan_gpio_item_config *cfg = &configs[i];
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int err = gpio_pin_interrupt_configure(dev, cfg->pin, flags);
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if (err)
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{
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LOG_ERR("Unable to enable matrix GPIO interrupt");
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return err;
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}
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}
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return 0;
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}
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static int kscan_gpio_direct_enable(struct device *dev)
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{
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return kscan_gpio_config_interrupts(dev,
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GPIO_INT_DEBOUNCE | GPIO_INT_EDGE_BOTH);
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}
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static int kscan_gpio_direct_disable(struct device *dev)
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{
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return kscan_gpio_config_interrupts(dev,
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GPIO_INT_DISABLE);
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}
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static void kscan_gpio_irq_callback_handler(struct device *dev,
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struct gpio_callback *cb, gpio_port_pins_t pin)
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{
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struct kscan_gpio_irq_callback *data =
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CONTAINER_OF(cb, struct kscan_gpio_irq_callback, callback);
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if (data->debounce_period > 0) {
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k_delayed_work_cancel(&data->work->delayed);
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k_delayed_work_submit(&data->work->delayed, K_MSEC(data->debounce_period));
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} else {
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k_work_submit(&data->work->direct);
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}
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}
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#else /* !defined(CONFIG_ZMK_KSCAN_GPIO_POLLING) */
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static void kscan_gpio_timer_handler(struct k_timer *timer)
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{
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struct kscan_gpio_data *data =
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CONTAINER_OF(timer, struct kscan_gpio_data, poll_timer);
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k_work_submit(&data->work.direct);
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}
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static int kscan_gpio_direct_enable(struct device *dev)
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{
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struct kscan_gpio_data *data = dev->driver_data;
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k_timer_start(&data->poll_timer, K_MSEC(10), K_MSEC(10));
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return 0;
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}
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static int kscan_gpio_direct_disable(struct device *dev)
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{
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struct kscan_gpio_data *data = dev->driver_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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#endif /* defined(CONFIG_ZMK_KSCAN_GPIO_POLLING) */
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static int kscan_gpio_direct_configure(struct device *dev, kscan_callback_t callback)
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{
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struct kscan_gpio_data *data = dev->driver_data;
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if (!callback)
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{
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return -EINVAL;
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}
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data->callback = callback;
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return 0;
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}
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static int kscan_gpio_read(struct device *dev)
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{
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struct kscan_gpio_data *data = dev->driver_data;
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const struct kscan_gpio_config *cfg = dev->config_info;
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u32_t read_state = data->pin_state;
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for (int i = 0; i < cfg->num_of_inputs; i++)
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{
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struct device *in_dev = kscan_gpio_input_devices(dev)[i];
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const struct kscan_gpio_item_config *in_cfg = &kscan_gpio_input_configs(dev)[i];
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WRITE_BIT(read_state, i, gpio_pin_get(in_dev, in_cfg->pin) > 0);
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}
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for (int i = 0; i < cfg->num_of_inputs; i++)
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{
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bool prev_pressed = BIT(i) & data->pin_state;
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bool pressed = BIT(i) & read_state;
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if (pressed != prev_pressed)
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{
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LOG_DBG("Sending event at %d,%d state %s",
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0, i, (pressed ? "on" : "off"));
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WRITE_BIT(data->pin_state, i, pressed);
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data->callback(dev, 0, i, pressed);
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}
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}
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return 0;
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}
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static void kscan_gpio_work_handler(struct k_work *work)
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{
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struct kscan_gpio_data *data =
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CONTAINER_OF(work, struct kscan_gpio_data, work);
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kscan_gpio_read(data->dev);
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}
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static const struct kscan_driver_api gpio_driver_api = {
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.config = kscan_gpio_direct_configure,
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.enable_callback = kscan_gpio_direct_enable,
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.disable_callback = kscan_gpio_direct_disable,
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};
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#define KSCAN_DIRECT_INPUT_ITEM(i,n) \
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{ \
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.label = DT_INST_GPIO_LABEL_BY_IDX(n, input_gpios, i), \
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.pin = DT_INST_GPIO_PIN_BY_IDX(n, input_gpios, i), \
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.flags = DT_INST_GPIO_FLAGS_BY_IDX(n, input_gpios, i), \
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},
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#define INST_INPUT_LEN(n) DT_INST_PROP_LEN(n, input_gpios)
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#define GPIO_INST_INIT(n) \
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COND_CODE_0(CONFIG_ZMK_KSCAN_GPIO_POLLING, (static struct kscan_gpio_irq_callback \
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irq_callbacks_##n[INST_INPUT_LEN(n)];), ()) \
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static struct kscan_gpio_data kscan_gpio_data_##n = { \
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.inputs = { [INST_INPUT_LEN(n)-1] = NULL } \
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}; \
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static int kscan_gpio_init_##n(struct device *dev) \
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{ \
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struct kscan_gpio_data *data = dev->driver_data; \
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const struct kscan_gpio_config *cfg = dev->config_info; \
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int err; \
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struct device **input_devices = kscan_gpio_input_devices(dev); \
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for (int i = 0; i < cfg->num_of_inputs; i++) \
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{ \
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const struct kscan_gpio_item_config *in_cfg = &kscan_gpio_input_configs(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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{ \
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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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{ \
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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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} \
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COND_CODE_0(CONFIG_ZMK_KSCAN_GPIO_POLLING, \
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( \
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irq_callbacks_##n[i].work = &data->work; \
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irq_callbacks_##n[i].debounce_period = cfg->debounce_period; \
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gpio_init_callback(&irq_callbacks_##n[i].callback, kscan_gpio_irq_callback_handler, BIT(in_cfg->pin)); \
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err = gpio_add_callback(input_devices[i], &irq_callbacks_##n[i].callback); \
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if (err) \
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{ \
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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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} \
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data->dev = dev; \
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COND_CODE_1(CONFIG_ZMK_KSCAN_GPIO_POLLING, (k_timer_init(&data->poll_timer, kscan_gpio_timer_handler, NULL);), ( )) \
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if (cfg->debounce_period > 0) { \
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k_delayed_work_init(&data->work.delayed, kscan_gpio_work_handler); \
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} else { \
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k_work_init(&data->work.direct, kscan_gpio_work_handler); \
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} \
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return 0; \
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} \
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static const struct kscan_gpio_config kscan_gpio_config_##n = { \
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.inputs = { UTIL_LISTIFY(INST_INPUT_LEN(n), KSCAN_DIRECT_INPUT_ITEM, n) }, \
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.num_of_inputs = INST_INPUT_LEN(n), \
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.debounce_period = DT_INST_PROP(n, debounce_period) \
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}; \
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DEVICE_AND_API_INIT(kscan_gpio_##n, DT_INST_LABEL(n), kscan_gpio_init_##n, \
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&kscan_gpio_data_##n, &kscan_gpio_config_##n, \
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POST_KERNEL, CONFIG_ZMK_KSCAN_INIT_PRIORITY, \
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&gpio_driver_api);
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DT_INST_FOREACH_STATUS_OKAY(GPIO_INST_INIT)
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#endif /* DT_HAS_COMPAT_STATUS_OKAY(DT_DRV_COMPAT) */
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