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230 lines
11 KiB
230 lines
11 KiB
/* |
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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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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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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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#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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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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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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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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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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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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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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return kscan_gpio_config_interrupts(dev, 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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return kscan_gpio_config_interrupts(dev, GPIO_INT_DISABLE); |
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} |
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static void kscan_gpio_irq_callback_handler(struct device *dev, struct gpio_callback *cb, |
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gpio_port_pins_t pin) { |
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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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struct kscan_gpio_data *data = 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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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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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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struct kscan_gpio_data *data = dev->driver_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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return 0; |
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} |
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static int kscan_gpio_read(struct device *dev) { |
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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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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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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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LOG_DBG("Sending event at %d,%d state %s", 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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struct kscan_gpio_data *data = 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, \ |
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(static struct kscan_gpio_irq_callback 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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static int kscan_gpio_init_##n(struct device *dev) { \ |
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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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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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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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} \ |
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COND_CODE_0( \ |
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CONFIG_ZMK_KSCAN_GPIO_POLLING, \ |
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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, \ |
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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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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, \ |
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(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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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, POST_KERNEL, \ |
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CONFIG_ZMK_KSCAN_INIT_PRIORITY, &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) */ |