/* * Copyright (c) 2020 The ZMK Contributors * * SPDX-License-Identifier: MIT */ #define DT_DRV_COMPAT zmk_kscan_gpio_direct #include #include #include #include LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL); #if DT_HAS_COMPAT_STATUS_OKAY(DT_DRV_COMPAT) struct kscan_gpio_item_config { char *label; gpio_pin_t pin; gpio_flags_t flags; }; union work_reference { struct k_delayed_work delayed; struct k_work direct; }; struct kscan_gpio_config { u8_t num_of_inputs; u8_t debounce_period; struct kscan_gpio_item_config inputs[]; }; struct kscan_gpio_data { #if defined(CONFIG_ZMK_KSCAN_GPIO_POLLING) struct k_timer poll_timer; #endif /* defined(CONFIG_ZMK_KSCAN_GPIO_POLLING) */ kscan_callback_t callback; union work_reference work; struct device *dev; u32_t pin_state; struct device *inputs[]; }; static struct device **kscan_gpio_input_devices(struct device *dev) { struct kscan_gpio_data *data = dev->driver_data; return data->inputs; } static const struct kscan_gpio_item_config *kscan_gpio_input_configs(struct device *dev) { const struct kscan_gpio_config *cfg = dev->config_info; return cfg->inputs; } #if !defined(CONFIG_ZMK_KSCAN_GPIO_POLLING) struct kscan_gpio_irq_callback { union work_reference *work; u8_t debounce_period; struct gpio_callback callback; }; static int kscan_gpio_config_interrupts(struct device *dev, gpio_flags_t flags) { const struct kscan_gpio_config *cfg = dev->config_info; struct device **devices = kscan_gpio_input_devices(dev); const struct kscan_gpio_item_config *configs = kscan_gpio_input_configs(dev); for (int i = 0; i < cfg->num_of_inputs; i++) { struct device *dev = devices[i]; const struct kscan_gpio_item_config *cfg = &configs[i]; int err = gpio_pin_interrupt_configure(dev, cfg->pin, flags); if (err) { LOG_ERR("Unable to enable matrix GPIO interrupt"); return err; } } return 0; } static int kscan_gpio_direct_enable(struct device *dev) { return kscan_gpio_config_interrupts(dev, GPIO_INT_DEBOUNCE | GPIO_INT_EDGE_BOTH); } static int kscan_gpio_direct_disable(struct device *dev) { return kscan_gpio_config_interrupts(dev, GPIO_INT_DISABLE); } static void kscan_gpio_irq_callback_handler(struct device *dev, struct gpio_callback *cb, gpio_port_pins_t pin) { struct kscan_gpio_irq_callback *data = CONTAINER_OF(cb, struct kscan_gpio_irq_callback, callback); if (data->debounce_period > 0) { k_delayed_work_cancel(&data->work->delayed); k_delayed_work_submit(&data->work->delayed, K_MSEC(data->debounce_period)); } else { k_work_submit(&data->work->direct); } } #else /* !defined(CONFIG_ZMK_KSCAN_GPIO_POLLING) */ static void kscan_gpio_timer_handler(struct k_timer *timer) { struct kscan_gpio_data *data = CONTAINER_OF(timer, struct kscan_gpio_data, poll_timer); k_work_submit(&data->work.direct); } static int kscan_gpio_direct_enable(struct device *dev) { struct kscan_gpio_data *data = dev->driver_data; k_timer_start(&data->poll_timer, K_MSEC(10), K_MSEC(10)); return 0; } static int kscan_gpio_direct_disable(struct device *dev) { struct kscan_gpio_data *data = dev->driver_data; k_timer_stop(&data->poll_timer); return 0; } #endif /* defined(CONFIG_ZMK_KSCAN_GPIO_POLLING) */ static int kscan_gpio_direct_configure(struct device *dev, kscan_callback_t callback) { struct kscan_gpio_data *data = dev->driver_data; if (!callback) { return -EINVAL; } data->callback = callback; return 0; } static int kscan_gpio_read(struct device *dev) { struct kscan_gpio_data *data = dev->driver_data; const struct kscan_gpio_config *cfg = dev->config_info; u32_t read_state = data->pin_state; for (int i = 0; i < cfg->num_of_inputs; i++) { struct device *in_dev = kscan_gpio_input_devices(dev)[i]; const struct kscan_gpio_item_config *in_cfg = &kscan_gpio_input_configs(dev)[i]; WRITE_BIT(read_state, i, gpio_pin_get(in_dev, in_cfg->pin) > 0); } for (int i = 0; i < cfg->num_of_inputs; i++) { bool prev_pressed = BIT(i) & data->pin_state; bool pressed = BIT(i) & read_state; if (pressed != prev_pressed) { LOG_DBG("Sending event at %d,%d state %s", 0, i, (pressed ? "on" : "off")); WRITE_BIT(data->pin_state, i, pressed); data->callback(dev, 0, i, pressed); } } return 0; } static void kscan_gpio_work_handler(struct k_work *work) { struct kscan_gpio_data *data = CONTAINER_OF(work, struct kscan_gpio_data, work); kscan_gpio_read(data->dev); } static const struct kscan_driver_api gpio_driver_api = { .config = kscan_gpio_direct_configure, .enable_callback = kscan_gpio_direct_enable, .disable_callback = kscan_gpio_direct_disable, }; #define KSCAN_DIRECT_INPUT_ITEM(i,n) \ { \ .label = DT_INST_GPIO_LABEL_BY_IDX(n, input_gpios, i), \ .pin = DT_INST_GPIO_PIN_BY_IDX(n, input_gpios, i), \ .flags = DT_INST_GPIO_FLAGS_BY_IDX(n, input_gpios, i), \ }, #define INST_INPUT_LEN(n) DT_INST_PROP_LEN(n, input_gpios) #define GPIO_INST_INIT(n) \ COND_CODE_0(CONFIG_ZMK_KSCAN_GPIO_POLLING, (static struct kscan_gpio_irq_callback \ irq_callbacks_##n[INST_INPUT_LEN(n)];), ()) \ static struct kscan_gpio_data kscan_gpio_data_##n = { \ .inputs = { [INST_INPUT_LEN(n)-1] = NULL } \ }; \ static int kscan_gpio_init_##n(struct device *dev) \ { \ struct kscan_gpio_data *data = dev->driver_data; \ const struct kscan_gpio_config *cfg = dev->config_info; \ int err; \ struct device **input_devices = kscan_gpio_input_devices(dev); \ for (int i = 0; i < cfg->num_of_inputs; i++) \ { \ const struct kscan_gpio_item_config *in_cfg = &kscan_gpio_input_configs(dev)[i]; \ input_devices[i] = device_get_binding(in_cfg->label); \ if (!input_devices[i]) \ { \ LOG_ERR("Unable to find input GPIO device"); \ return -EINVAL; \ } \ err = gpio_pin_configure(input_devices[i], in_cfg->pin, GPIO_INPUT | in_cfg->flags); \ if (err) \ { \ LOG_ERR("Unable to configure pin %d on %s for input", in_cfg->pin, in_cfg->label); \ return err; \ } \ COND_CODE_0(CONFIG_ZMK_KSCAN_GPIO_POLLING, \ ( \ irq_callbacks_##n[i].work = &data->work; \ irq_callbacks_##n[i].debounce_period = cfg->debounce_period; \ gpio_init_callback(&irq_callbacks_##n[i].callback, kscan_gpio_irq_callback_handler, BIT(in_cfg->pin)); \ err = gpio_add_callback(input_devices[i], &irq_callbacks_##n[i].callback); \ if (err) \ { \ LOG_ERR("Error adding the callback to the column device"); \ return err; \ } \ ), ()) \ } \ data->dev = dev; \ COND_CODE_1(CONFIG_ZMK_KSCAN_GPIO_POLLING, (k_timer_init(&data->poll_timer, kscan_gpio_timer_handler, NULL);), ( )) \ if (cfg->debounce_period > 0) { \ k_delayed_work_init(&data->work.delayed, kscan_gpio_work_handler); \ } else { \ k_work_init(&data->work.direct, kscan_gpio_work_handler); \ } \ return 0; \ } \ static const struct kscan_gpio_config kscan_gpio_config_##n = { \ .inputs = { UTIL_LISTIFY(INST_INPUT_LEN(n), KSCAN_DIRECT_INPUT_ITEM, n) }, \ .num_of_inputs = INST_INPUT_LEN(n), \ .debounce_period = DT_INST_PROP(n, debounce_period) \ }; \ DEVICE_AND_API_INIT(kscan_gpio_##n, DT_INST_LABEL(n), kscan_gpio_init_##n, \ &kscan_gpio_data_##n, &kscan_gpio_config_##n, \ POST_KERNEL, CONFIG_ZMK_KSCAN_INIT_PRIORITY, \ &gpio_driver_api); DT_INST_FOREACH_STATUS_OKAY(GPIO_INST_INIT) #endif /* DT_HAS_COMPAT_STATUS_OKAY(DT_DRV_COMPAT) */