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/*
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* Copyright (c) 2020 Peter Johanson <peter@peterjohanson.com>
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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_matrix
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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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#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 _KSCAN_GPIO_ROW_CFG_INIT(idx, n) _KSCAN_GPIO_ITEM_CFG_INIT(n, row_gpios, idx)
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#define _KSCAN_GPIO_COL_CFG_INIT(idx, n) _KSCAN_GPIO_ITEM_CFG_INIT(n, col_gpios, idx)
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static int kscan_gpio_config_interrupts(struct device **devices,
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const struct kscan_gpio_item_config *configs,
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size_t len, gpio_flags_t flags)
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{
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for (int i = 0; i < len; 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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#define INST_MATRIX_ROWS(n) DT_INST_PROP_LEN(n, row_gpios)
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#define INST_MATRIX_COLS(n) DT_INST_PROP_LEN(n, col_gpios)
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#define INST_OUTPUT_LEN(n) COND_CODE_0(DT_ENUM_IDX(DT_DRV_INST(n), diode_direction), (INST_MATRIX_ROWS(n)), (INST_MATRIX_COLS(n)))
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#define INST_INPUT_LEN(n) COND_CODE_0(DT_ENUM_IDX(DT_DRV_INST(n), diode_direction), (INST_MATRIX_COLS(n)), (INST_MATRIX_ROWS(n)))
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#define GPIO_INST_INIT(n) \
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struct kscan_gpio_irq_callback_##n \
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{ \
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struct COND_CODE_0(DT_INST_PROP(n, debounce_period), (k_work), (k_delayed_work)) * work; \
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struct gpio_callback callback; \
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}; \
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static struct kscan_gpio_irq_callback_##n \
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irq_callbacks_##n[INST_INPUT_LEN(n)]; \
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struct kscan_gpio_config_##n \
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{ \
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struct kscan_gpio_item_config rows[INST_MATRIX_ROWS(n)]; \
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struct kscan_gpio_item_config cols[INST_MATRIX_COLS(n)]; \
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}; \
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struct kscan_gpio_data_##n \
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{ \
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kscan_callback_t callback; \
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struct COND_CODE_0(DT_INST_PROP(n, debounce_period), (k_work), (k_delayed_work)) work; \
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bool matrix_state[INST_MATRIX_ROWS(n)][INST_MATRIX_COLS(n)]; \
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struct device *rows[INST_MATRIX_ROWS(n)]; \
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struct device *cols[INST_MATRIX_COLS(n)]; \
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struct device *dev; \
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}; \
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static struct device **kscan_gpio_input_devices_##n(struct device *dev) \
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{ \
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struct kscan_gpio_data_##n *data = dev->driver_data; \
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return (COND_CODE_0(DT_ENUM_IDX(DT_DRV_INST(n), diode_direction), (data->cols), (data->rows))); \
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} \
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static const struct kscan_gpio_item_config *kscan_gpio_input_configs_##n(struct device *dev) \
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{ \
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const struct kscan_gpio_config_##n *cfg = dev->config_info; \
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return ((COND_CODE_0(DT_ENUM_IDX(DT_DRV_INST(n), diode_direction), (cfg->cols), (cfg->rows)))); \
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} \
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static struct device **kscan_gpio_output_devices_##n(struct device *dev) \
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{ \
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struct kscan_gpio_data_##n *data = dev->driver_data; \
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return (COND_CODE_0(DT_ENUM_IDX(DT_DRV_INST(n), diode_direction), (data->rows), (data->cols))); \
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} \
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static const struct kscan_gpio_item_config *kscan_gpio_output_configs_##n(struct device *dev) \
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{ \
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const struct kscan_gpio_config_##n *cfg = dev->config_info; \
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return (COND_CODE_0(DT_ENUM_IDX(DT_DRV_INST(n), diode_direction), (cfg->rows), (cfg->cols))); \
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} \
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static int kscan_gpio_enable_interrupts_##n(struct device *dev) \
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{ \
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return kscan_gpio_config_interrupts(kscan_gpio_input_devices_##n(dev), kscan_gpio_input_configs_##n(dev), INST_INPUT_LEN(n), \
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GPIO_INT_DEBOUNCE | GPIO_INT_EDGE_BOTH); \
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} \
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static int kscan_gpio_disable_interrupts_##n(struct device *dev) \
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{ \
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return kscan_gpio_config_interrupts(kscan_gpio_input_devices_##n(dev), kscan_gpio_input_configs_##n(dev), INST_INPUT_LEN(n), \
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GPIO_INT_DISABLE); \
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} \
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static void kscan_gpio_set_output_state_##n(struct device *dev, int value) \
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{ \
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for (int i = 0; i < INST_OUTPUT_LEN(n); i++) \
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{ \
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struct device *in_dev = kscan_gpio_output_devices_##n(dev)[i]; \
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const struct kscan_gpio_item_config *cfg = &kscan_gpio_output_configs_##n(dev)[i]; \
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gpio_pin_set(in_dev, cfg->pin, value); \
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} \
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} \
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static void kscan_gpio_set_matrix_state_##n(bool state[INST_MATRIX_ROWS(n)][INST_MATRIX_COLS(n)], u32_t input_index, u32_t output_index, bool value) \
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{ \
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state[COND_CODE_0(DT_ENUM_IDX(DT_DRV_INST(n), diode_direction), (output_index), (input_index))][COND_CODE_0(DT_ENUM_IDX(DT_DRV_INST(n), diode_direction), (input_index), (output_index))] = value; \
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} \
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static int kscan_gpio_read_##n(struct device *dev) \
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{ \
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bool submit_follow_up_read = false; \
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struct kscan_gpio_data_##n *data = dev->driver_data; \
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static bool read_state[INST_MATRIX_ROWS(n)][INST_MATRIX_COLS(n)]; \
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/* Disable our interrupts temporarily while we scan, to avoid */ \
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/* re-entry while we iterate columns and set them active one by one */ \
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/* to get pressed state for each matrix cell. */ \
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kscan_gpio_disable_interrupts_##n(dev); \
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kscan_gpio_set_output_state_##n(dev, 0); \
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for (int o = 0; o < INST_OUTPUT_LEN(n); o++) \
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{ \
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struct device *out_dev = kscan_gpio_output_devices_##n(dev)[o]; \
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const struct kscan_gpio_item_config *out_cfg = &kscan_gpio_output_configs_##n(dev)[o]; \
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gpio_pin_set(out_dev, out_cfg->pin, 1); \
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for (int i = 0; i < INST_INPUT_LEN(n); i++) \
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{ \
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struct device *in_dev = kscan_gpio_input_devices_##n(dev)[i]; \
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const struct kscan_gpio_item_config *in_cfg = &kscan_gpio_input_configs_##n(dev)[i]; \
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kscan_gpio_set_matrix_state_##n(read_state, i, o, gpio_pin_get(in_dev, in_cfg->pin) > 0); \
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} \
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gpio_pin_set(out_dev, out_cfg->pin, 0); \
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} \
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/* Set all our outputs as active again, then re-enable interrupts, */ \
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/* so we can trigger interrupts again for future press/release */ \
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kscan_gpio_set_output_state_##n(dev, 1); \
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kscan_gpio_enable_interrupts_##n(dev); \
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for (int r = 0; r < INST_MATRIX_ROWS(n); r++) \
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{ \
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for (int c = 0; c < INST_MATRIX_COLS(n); c++) \
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{ \
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bool pressed = read_state[r][c]; \
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/* Follow up reads needed because further interrupts won't fire on already tripped input GPIO pins */ \
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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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{ \
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LOG_DBG("Sending event at %d,%d state %s", \
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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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COND_CODE_0(DT_INST_PROP(n, debounce_period), \
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({ k_work_submit(&data->work); }), \
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({ \
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k_delayed_work_cancel(&data->work); \
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k_delayed_work_submit(&data->work, K_MSEC(1)); })) \
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} \
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return 0; \
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} \
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static void kscan_gpio_work_handler_##n(struct k_work *work) \
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{ \
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struct kscan_gpio_data_##n *data = \
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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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static void kscan_gpio_irq_callback_handler_##n(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_##n *data = \
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CONTAINER_OF(cb, struct kscan_gpio_irq_callback_##n, callback); \
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COND_CODE_0(DT_INST_PROP(n, debounce_period), \
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({ k_work_submit(data->work); }), \
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({ \
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k_delayed_work_cancel(data->work); \
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k_delayed_work_submit(data->work, K_MSEC(DT_INST_PROP(n, debounce_period))); })) \
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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_ROWS(n)-1] = NULL}, \
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.cols = { [INST_MATRIX_COLS(n)-1] = NULL }\
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}; \
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static int kscan_gpio_configure_##n(struct device *dev, kscan_callback_t callback) \
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{ \
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struct kscan_gpio_data_##n *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_init_##n(struct device *dev) \
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{ \
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struct kscan_gpio_data_##n *data = dev->driver_data; \
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int err; \
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struct device **input_devices = kscan_gpio_input_devices_##n(dev); \
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for (int i = 0; i < INST_INPUT_LEN(n); i++) \
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{ \
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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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{ \
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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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irq_callbacks_##n[i].work = &data->work; \
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gpio_init_callback(&irq_callbacks_##n[i].callback, kscan_gpio_irq_callback_handler_##n, 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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struct device **output_devices = kscan_gpio_output_devices_##n(dev); \
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for (int o = 0; o < INST_OUTPUT_LEN(n); o++) \
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{ \
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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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{ \
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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, GPIO_OUTPUT_ACTIVE | out_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 output", out_cfg->pin, out_cfg->label); \
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return err; \
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} \
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} \
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data->dev = dev; \
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(COND_CODE_0(DT_INST_PROP(n, debounce_period), (k_work_init), (k_delayed_work_init)))(&data->work, kscan_gpio_work_handler_##n); \
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return 0; \
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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_interrupts_##n, \
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.disable_callback = kscan_gpio_disable_interrupts_##n, \
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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_ROWS(n), _KSCAN_GPIO_ROW_CFG_INIT, n) }, \
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.cols = { UTIL_LISTIFY(INST_MATRIX_COLS(n), _KSCAN_GPIO_COL_CFG_INIT, n) }, \
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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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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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#endif /* DT_HAS_COMPAT_STATUS_OKAY(DT_DRV_COMPAT) */
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