516 lines
14 KiB
C
516 lines
14 KiB
C
/*
|
|
* 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);
|