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zmk/drivers/zephyr/kscan_gpio.c

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/*
* Copyright (c) 2020 Peter Johanson <peter@peterjohanson.com>
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT gpio_kscan
#include <device.h>
#include <drivers/kscan.h>
#include <drivers/gpio.h>
#include <logging/log.h>
LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
#define MATRIX_NODE_ID DT_DRV_INST(0)
#define MATRIX_ROWS DT_PROP_LEN(MATRIX_NODE_ID, row_gpios)
#define MATRIX_COLS DT_PROP_LEN(MATRIX_NODE_ID, col_gpios)
#if DT_ENUM_IDX(MATRIX_NODE_ID, diode_direction) == 0
#define SCAN_ROW_TO_COLUMN
#else
#define SCAN_COL_TO_ROW
#endif
struct kscan_gpio_item_config
{
char *label;
gpio_pin_t pin;
gpio_flags_t flags;
};
struct kscan_gpio_config
{
u8_t debounce_period;
struct kscan_gpio_item_config rows[MATRIX_ROWS];
struct kscan_gpio_item_config cols[MATRIX_COLS];
};
struct kscan_gpio_data
{
kscan_callback_t callback;
#if DT_PROP(MATRIX_NODE_ID, debounce_id) == 0
struct k_work work;
#else
struct k_delayed_work work;
#endif
bool matrix_state[MATRIX_ROWS][MATRIX_COLS];
struct device *rows[MATRIX_ROWS];
struct device *cols[MATRIX_COLS];
struct device *dev;
};
struct kscan_gpio_irq_callback
{
#if DT_PROP(MATRIX_NODE_ID, debounce_id) == 0
struct k_work *work;
#else
struct k_delayed_work *work;
#endif
struct gpio_callback callback;
};
static int kscan_gpio_config_interrupts(struct device **devices,
const struct kscan_gpio_item_config *configs,
size_t len, gpio_flags_t flags)
{
for (int i = 0; i < len; 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;
}
#ifdef SCAN_ROW_TO_COLUMN
static struct kscan_gpio_irq_callback irq_callbacks[MATRIX_COLS];
static int kscan_gpio_enable_interrupts(struct device *dev)
{
struct kscan_gpio_data *data = dev->driver_data;
const struct kscan_gpio_config *cfg = dev->config_info;
return kscan_gpio_config_interrupts(
data->cols, cfg->cols, MATRIX_COLS,
GPIO_INT_DEBOUNCE | GPIO_INT_EDGE_BOTH);
}
static int kscan_gpio_disable_interrupts(struct device *dev)
{
struct kscan_gpio_data *data = dev->driver_data;
const struct kscan_gpio_config *cfg = dev->config_info;
return kscan_gpio_config_interrupts(
data->cols, cfg->cols, MATRIX_COLS,
GPIO_INT_DISABLE);
}
static void kscan_gpio_set_row_state(struct device *dev, int value)
{
struct kscan_gpio_data *data = dev->driver_data;
const struct kscan_gpio_config *cfg = dev->config_info;
for (int r = 0; r < MATRIX_ROWS; r++)
{
struct device *row = data->rows[r];
const struct kscan_gpio_item_config *row_cfg = &cfg->rows[r];
gpio_pin_set(row, row_cfg->pin, value);
}
}
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;
static bool read_state[MATRIX_ROWS][MATRIX_COLS];
LOG_DBG("Scanning the matrix for updated state");
/* Disable our interrupts temporarily while we scan, to avoid */
/* re-entry while we iterate columns and set them active one by one */
/* to get pressed state for each matrix cell. */
kscan_gpio_disable_interrupts(dev);
kscan_gpio_set_row_state(dev, 0);
for (int r = 0; r < MATRIX_ROWS; r++)
{
struct device *row = data->rows[r];
const struct kscan_gpio_item_config *row_cfg = &cfg->rows[r];
gpio_pin_set(row, row_cfg->pin, 1);
for (int c = 0; c < MATRIX_COLS; c++)
{
struct device *col = data->cols[c];
const struct kscan_gpio_item_config *col_cfg = &cfg->cols[c];
read_state[r][c] =
gpio_pin_get(col, col_cfg->pin) > 0;
}
gpio_pin_set(row, row_cfg->pin, 0);
}
/* Set all our outputs as active again, then re-enable interrupts, */
/* so we can trigger interrupts again for future press/release */
kscan_gpio_set_row_state(dev, 1);
kscan_gpio_enable_interrupts(dev);
for (int r = 0; r < MATRIX_ROWS; r++)
{
for (int c = 0; c < MATRIX_COLS; c++)
{
bool pressed = read_state[r][c];
if (pressed != data->matrix_state[r][c])
{
LOG_DBG("Sending event at %d,%d state %s",
r, c, (pressed ? "on" : "off"));
data->matrix_state[r][c] = pressed;
data->callback(dev, r, c, pressed);
}
}
}
return 0;
}
#else
static struct kscan_gpio_irq_callback irq_callbacks[MATRIX_ROWS];
static int kscan_gpio_enable_interrupts(struct device *dev)
{
struct kscan_gpio_data *data = dev->driver_data;
const struct kscan_gpio_config *cfg = dev->config_info;
return kscan_gpio_config_interrupts(data->rows, cfg->rows, MATRIX_ROWS,
GPIO_INT_DEBOUNCE | GPIO_INT_EDGE_BOTH);
}
static int kscan_gpio_disable_interrupts(struct device *dev)
{
struct kscan_gpio_data *data = dev->driver_data;
const struct kscan_gpio_config *cfg = dev->config_info;
return kscan_gpio_config_interrupts(data->rows, cfg->rows, MATRIX_ROWS,
GPIO_INT_DISABLE);
}
static void kscan_gpio_set_column_state(struct device *dev, int value)
{
struct kscan_gpio_data *data = dev->driver_data;
const struct kscan_gpio_config *cfg = dev->config_info;
for (int c = 0; c < MATRIX_COLS; c++)
{
struct device *col = data->cols[c];
const struct kscan_gpio_item_config *col_cfg = &cfg->cols[c];
gpio_pin_set(col, col_cfg->pin, value);
}
}
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;
static bool read_state[MATRIX_ROWS][MATRIX_COLS];
LOG_DBG("Scanning the matrix for updated state");
/* Disable our interrupts temporarily while we scan, to avoid */
/* re-entry while we iterate columns and set them active one by one */
/* to get pressed state for each matrix cell. */
kscan_gpio_disable_interrupts(dev);
kscan_gpio_set_column_state(dev, 0);
for (int c = 0; c < MATRIX_COLS; c++)
{
struct device *col = data->cols[c];
const struct kscan_gpio_item_config *col_cfg = &cfg->cols[c];
gpio_pin_set(col, col_cfg->pin, 1);
for (int r = 0; r < MATRIX_ROWS; r++)
{
struct device *row = data->rows[r];
const struct kscan_gpio_item_config *row_cfg = &cfg->rows[r];
read_state[r][c] =
gpio_pin_get(row, row_cfg->pin) > 0;
}
gpio_pin_set(col, col_cfg->pin, 0);
}
/* Set all our outputs as active again, then re-enable interrupts, */
/* so we can trigger interrupts again for future press/release */
kscan_gpio_set_column_state(dev, 1);
kscan_gpio_enable_interrupts(dev);
for (int r = 0; r < MATRIX_ROWS; r++)
{
for (int c = 0; c < MATRIX_COLS; c++)
{
bool pressed = read_state[r][c];
if (pressed != data->matrix_state[r][c])
{
LOG_DBG("Sending event at %d,%d state %s",
r, c, (pressed ? "on" : "off"));
data->matrix_state[r][c] = pressed;
data->callback(dev, r, c, pressed);
}
}
}
return 0;
}
#endif
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 DT_PROP(MATRIX_NODE_ID, debounce_id) == 0
k_work_submit(data->work);
#else
k_delayed_work_cancel(data->work);
k_delayed_work_submit(data->work,
K_MSEC(DT_PROP(MATRIX_NODE_ID, debounce_id)));
#endif
}
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 int kscan_gpio_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_init(struct device *dev)
{
struct kscan_gpio_data *data = dev->driver_data;
const struct kscan_gpio_config *cfg = dev->config_info;
int err;
#ifdef SCAN_ROW_TO_COLUMN
gpio_flags_t col_gpio_dir = GPIO_INPUT;
gpio_flags_t row_gpio_dir = GPIO_OUTPUT_ACTIVE;
#else
gpio_flags_t col_gpio_dir = GPIO_OUTPUT_ACTIVE;
gpio_flags_t row_gpio_dir = GPIO_INPUT;
#endif
for (int c = 0; c < MATRIX_COLS; c++)
{
const struct kscan_gpio_item_config *item_cfg = &cfg->cols[c];
data->cols[c] = device_get_binding(item_cfg->label);
if (data->cols[c] == NULL)
{
LOG_ERR("Unable to find column GPIO device\n");
return -EINVAL;
}
err = gpio_pin_configure(data->cols[c],
item_cfg->pin,
col_gpio_dir | item_cfg->flags);
if (err)
{
LOG_ERR("Unable to configure column GPIO pin");
return -EINVAL;
}
#ifdef SCAN_ROW_TO_COLUMN
irq_callbacks[c].work = &data->work;
gpio_init_callback(&irq_callbacks[c].callback,
kscan_gpio_irq_callback_handler,
BIT(item_cfg->pin));
if (gpio_add_callback(data->cols[c], &irq_callbacks[c].callback))
{
LOG_ERR("Error adding the callback to the column device");
}
#endif
}
for (int r = 0; r < MATRIX_ROWS; r++)
{
const struct kscan_gpio_item_config *item_cfg = &cfg->rows[r];
data->rows[r] = device_get_binding(item_cfg->label);
if (data->rows[r] == NULL)
{
LOG_ERR("Unable to find row GPIO device\n");
return -EINVAL;
}
int err = gpio_pin_configure(data->rows[r],
item_cfg->pin,
row_gpio_dir | item_cfg->flags);
if (err)
{
LOG_ERR("Unable to configure row GPIO pin");
return -EINVAL;
}
#ifdef SCAN_COL_TO_ROW
irq_callbacks[r].work = &data->work;
gpio_init_callback(&irq_callbacks[r].callback,
kscan_gpio_irq_callback_handler,
BIT(item_cfg->pin));
gpio_add_callback(data->rows[r], &irq_callbacks[r].callback);
#endif
}
data->dev = dev;
#if DT_PROP(MATRIX_NODE_ID, debounce_id) == 0
k_work_init(&data->work, kscan_gpio_work_handler);
#else
k_delayed_work_init(&data->work, kscan_gpio_work_handler);
#endif
return 0;
}
static const struct kscan_driver_api gpio_driver_api = {
.config = kscan_gpio_configure,
.enable_callback = kscan_gpio_enable_interrupts,
.disable_callback = kscan_gpio_disable_interrupts,
};
#define _KSCAN_GPIO_ITEM_CFG_INIT(prop, idx) \
{ \
.label = DT_GPIO_LABEL_BY_IDX(MATRIX_NODE_ID, prop, idx), \
.pin = DT_GPIO_PIN_BY_IDX(MATRIX_NODE_ID, prop, idx), \
.flags = DT_GPIO_FLAGS_BY_IDX(MATRIX_NODE_ID, prop, idx), \
}
static const struct kscan_gpio_config kscan_gpio_config = {
.rows = {
#if DT_PROP_HAS_IDX(MATRIX_NODE_ID, row_gpios, 0)
_KSCAN_GPIO_ITEM_CFG_INIT(row_gpios, 0),
#endif
#if DT_PROP_HAS_IDX(MATRIX_NODE_ID, row_gpios, 1)
_KSCAN_GPIO_ITEM_CFG_INIT(row_gpios, 1),
#endif
#if DT_PROP_HAS_IDX(MATRIX_NODE_ID, row_gpios, 2)
_KSCAN_GPIO_ITEM_CFG_INIT(row_gpios, 2),
#endif
#if DT_PROP_HAS_IDX(MATRIX_NODE_ID, row_gpios, 3)
_KSCAN_GPIO_ITEM_CFG_INIT(row_gpios, 3),
#endif
#if DT_PROP_HAS_IDX(MATRIX_NODE_ID, row_gpios, 4)
_KSCAN_GPIO_ITEM_CFG_INIT(row_gpios, 4),
#endif
#if DT_PROP_HAS_IDX(MATRIX_NODE_ID, row_gpios, 5)
_KSCAN_GPIO_ITEM_CFG_INIT(row_gpios, 5),
#endif
#if DT_PROP_HAS_IDX(MATRIX_NODE_ID, row_gpios, 6)
_KSCAN_GPIO_ITEM_CFG_INIT(row_gpios, 6),
#endif
#if DT_PROP_HAS_IDX(MATRIX_NODE_ID, row_gpios, 7)
_KSCAN_GPIO_ITEM_CFG_INIT(row_gpios, 7),
#endif
#if DT_PROP_HAS_IDX(MATRIX_NODE_ID, row_gpios, 8)
_KSCAN_GPIO_ITEM_CFG_INIT(row_gpios, 8),
#endif
#if DT_PROP_HAS_IDX(MATRIX_NODE_ID, row_gpios, 9)
_KSCAN_GPIO_ITEM_CFG_INIT(row_gpios, 9),
#endif
#if DT_PROP_HAS_IDX(MATRIX_NODE_ID, row_gpios, 10)
_KSCAN_GPIO_ITEM_CFG_INIT(row_gpios, 10),
#endif
},
.cols = {
#if DT_PROP_HAS_IDX(MATRIX_NODE_ID, col_gpios, 0)
_KSCAN_GPIO_ITEM_CFG_INIT(col_gpios, 0),
#endif
#if DT_PROP_HAS_IDX(MATRIX_NODE_ID, col_gpios, 1)
_KSCAN_GPIO_ITEM_CFG_INIT(col_gpios, 1),
#endif
#if DT_PROP_HAS_IDX(MATRIX_NODE_ID, col_gpios, 2)
_KSCAN_GPIO_ITEM_CFG_INIT(col_gpios, 2),
#endif
#if DT_PROP_HAS_IDX(MATRIX_NODE_ID, col_gpios, 3)
_KSCAN_GPIO_ITEM_CFG_INIT(col_gpios, 3),
#endif
#if DT_PROP_HAS_IDX(MATRIX_NODE_ID, col_gpios, 4)
_KSCAN_GPIO_ITEM_CFG_INIT(col_gpios, 4),
#endif
#if DT_PROP_HAS_IDX(MATRIX_NODE_ID, col_gpios, 5)
_KSCAN_GPIO_ITEM_CFG_INIT(col_gpios, 5),
#endif
#if DT_PROP_HAS_IDX(MATRIX_NODE_ID, col_gpios, 6)
_KSCAN_GPIO_ITEM_CFG_INIT(col_gpios, 6),
#endif
#if DT_PROP_HAS_IDX(MATRIX_NODE_ID, col_gpios, 7)
_KSCAN_GPIO_ITEM_CFG_INIT(col_gpios, 7),
#endif
#if DT_PROP_HAS_IDX(MATRIX_NODE_ID, col_gpios, 8)
_KSCAN_GPIO_ITEM_CFG_INIT(col_gpios, 8),
#endif
#if DT_PROP_HAS_IDX(MATRIX_NODE_ID, col_gpios, 9)
_KSCAN_GPIO_ITEM_CFG_INIT(col_gpios, 9),
#endif
#if DT_PROP_HAS_IDX(MATRIX_NODE_ID, col_gpios, 10)
_KSCAN_GPIO_ITEM_CFG_INIT(col_gpios, 10),
#endif
#if DT_PROP_HAS_IDX(MATRIX_NODE_ID, col_gpios, 11)
_KSCAN_GPIO_ITEM_CFG_INIT(col_gpios, 11),
#endif
#if DT_PROP_HAS_IDX(MATRIX_NODE_ID, col_gpios, 12)
_KSCAN_GPIO_ITEM_CFG_INIT(col_gpios, 12),
#endif
#if DT_PROP_HAS_IDX(MATRIX_NODE_ID, col_gpios, 13)
_KSCAN_GPIO_ITEM_CFG_INIT(col_gpios, 13),
#endif
#if DT_PROP_HAS_IDX(MATRIX_NODE_ID, col_gpios, 14)
_KSCAN_GPIO_ITEM_CFG_INIT(col_gpios, 14),
#endif
#if DT_PROP_HAS_IDX(MATRIX_NODE_ID, col_gpios, 15)
_KSCAN_GPIO_ITEM_CFG_INIT(col_gpios, 15),
#endif
#if DT_PROP_HAS_IDX(MATRIX_NODE_ID, col_gpios, 16)
_KSCAN_GPIO_ITEM_CFG_INIT(col_gpios, 16),
#endif
#if DT_PROP_HAS_IDX(MATRIX_NODE_ID, col_gpios, 17)
_KSCAN_GPIO_ITEM_CFG_INIT(col_gpios, 17),
#endif
#if DT_PROP_HAS_IDX(MATRIX_NODE_ID, col_gpios, 18)
_KSCAN_GPIO_ITEM_CFG_INIT(col_gpios, 18),
#endif
#if DT_PROP_HAS_IDX(MATRIX_NODE_ID, col_gpios, 19)
_KSCAN_GPIO_ITEM_CFG_INIT(col_gpios, 19),
#endif
}};
static struct kscan_gpio_data kscan_gpio_data;
DEVICE_AND_API_INIT(kscan_gpio, DT_INST_LABEL(0), kscan_gpio_init,
&kscan_gpio_data, &kscan_gpio_config,
POST_KERNEL, CONFIG_ZMK_KSCAN_INIT_PRIORITY,
&gpio_driver_api);