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/*
* Copyright (c) 2020 The ZMK Contributors
*
* SPDX-License-Identifier: MIT
*/
#define DT_DRV_COMPAT zmk_kscan_gpio_direct
#include <device.h>
#include <drivers/kscan.h>
#include <drivers/gpio.h>
#include <logging/log.h>
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_DIRECT_POLLING)
struct k_timer poll_timer;
#endif /* defined(CONFIG_ZMK_KSCAN_DIRECT_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;
}
static void kscan_gpio_direct_queue_read(union work_reference *work, u8_t debounce_period) {
if (debounce_period > 0) {
k_delayed_work_cancel(&work->delayed);
k_delayed_work_submit(&work->delayed, K_MSEC(debounce_period));
} else {
k_work_submit(&work->direct);
}
}
#if !defined(CONFIG_ZMK_KSCAN_DIRECT_POLLING)
struct kscan_gpio_irq_callback {
struct device *dev;
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_LEVEL_ACTIVE);
}
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);
kscan_gpio_direct_disable(data->dev);
kscan_gpio_direct_queue_read(data->work, data->debounce_period);
}
#else /* !defined(CONFIG_ZMK_KSCAN_DIRECT_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);
kscan_gpio_direct_queue_read(&data->work, 0);
}
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_DIRECT_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;
bool submit_follow_up_read = false;
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) != 0;
submit_follow_up_read = (submit_follow_up_read || pressed);
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);
}
}
#if !defined(CONFIG_ZMK_KSCAN_DIRECT_POLLING)
if (submit_follow_up_read) {
kscan_gpio_direct_queue_read(&data->work, cfg->debounce_period);
} else {
kscan_gpio_direct_enable(dev);
}
#endif
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(IS_ENABLED(CONFIG_ZMK_KSCAN_DIRECT_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( \
IS_ENABLED(CONFIG_ZMK_KSCAN_DIRECT_POLLING), \
(irq_callbacks_##n[i].work = &data->work; irq_callbacks_##n[i].dev = dev; \
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(IS_ENABLED(CONFIG_ZMK_KSCAN_DIRECT_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) */
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