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zmk/app/drivers/zephyr/kscan_gpio_matrix.c

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/*
* Copyright (c) 2020 Peter Johanson <peter@peterjohanson.com>
*
* SPDX-License-Identifier: MIT
*/
#define DT_DRV_COMPAT zmk_kscan_gpio_matrix
#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;
};
#define _KSCAN_GPIO_ITEM_CFG_INIT(n, prop, idx) \
{ \
.label = DT_INST_GPIO_LABEL_BY_IDX(n, prop, idx), \
.pin = DT_INST_GPIO_PIN_BY_IDX(n, prop, idx), \
.flags = DT_INST_GPIO_FLAGS_BY_IDX(n, prop, idx), \
},
#define _KSCAN_GPIO_ROW_CFG_INIT(idx, n) _KSCAN_GPIO_ITEM_CFG_INIT(n, row_gpios, idx)
#define _KSCAN_GPIO_COL_CFG_INIT(idx, n) _KSCAN_GPIO_ITEM_CFG_INIT(n, col_gpios, idx)
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;
}
#define INST_MATRIX_ROWS(n) DT_INST_PROP_LEN(n, row_gpios)
#define INST_MATRIX_COLS(n) DT_INST_PROP_LEN(n, col_gpios)
#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)))
#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)))
#define GPIO_INST_INIT(n) \
struct kscan_gpio_irq_callback_##n \
{ \
struct COND_CODE_0(DT_INST_PROP(n, debounce_period), (k_work), (k_delayed_work)) * work; \
struct gpio_callback callback; \
}; \
static struct kscan_gpio_irq_callback_##n \
irq_callbacks_##n[INST_INPUT_LEN(n)]; \
struct kscan_gpio_config_##n \
{ \
struct kscan_gpio_item_config rows[INST_MATRIX_ROWS(n)]; \
struct kscan_gpio_item_config cols[INST_MATRIX_COLS(n)]; \
}; \
struct kscan_gpio_data_##n \
{ \
kscan_callback_t callback; \
struct COND_CODE_0(DT_INST_PROP(n, debounce_period), (k_work), (k_delayed_work)) work; \
bool matrix_state[INST_MATRIX_ROWS(n)][INST_MATRIX_COLS(n)]; \
struct device *rows[INST_MATRIX_ROWS(n)]; \
struct device *cols[INST_MATRIX_COLS(n)]; \
struct device *dev; \
}; \
static struct device **kscan_gpio_input_devices_##n(struct device *dev) \
{ \
struct kscan_gpio_data_##n *data = dev->driver_data; \
return (COND_CODE_0(DT_ENUM_IDX(DT_DRV_INST(n), diode_direction), (data->cols), (data->rows))); \
} \
static const struct kscan_gpio_item_config *kscan_gpio_input_configs_##n(struct device *dev) \
{ \
const struct kscan_gpio_config_##n *cfg = dev->config_info; \
return ((COND_CODE_0(DT_ENUM_IDX(DT_DRV_INST(n), diode_direction), (cfg->cols), (cfg->rows)))); \
} \
static struct device **kscan_gpio_output_devices_##n(struct device *dev) \
{ \
struct kscan_gpio_data_##n *data = dev->driver_data; \
return (COND_CODE_0(DT_ENUM_IDX(DT_DRV_INST(n), diode_direction), (data->rows), (data->cols))); \
} \
static const struct kscan_gpio_item_config *kscan_gpio_output_configs_##n(struct device *dev) \
{ \
const struct kscan_gpio_config_##n *cfg = dev->config_info; \
return (COND_CODE_0(DT_ENUM_IDX(DT_DRV_INST(n), diode_direction), (cfg->rows), (cfg->cols))); \
} \
static int kscan_gpio_enable_interrupts_##n(struct device *dev) \
{ \
return kscan_gpio_config_interrupts(kscan_gpio_input_devices_##n(dev), kscan_gpio_input_configs_##n(dev), INST_INPUT_LEN(n), \
GPIO_INT_DEBOUNCE | GPIO_INT_EDGE_BOTH); \
} \
static int kscan_gpio_disable_interrupts_##n(struct device *dev) \
{ \
return kscan_gpio_config_interrupts(kscan_gpio_input_devices_##n(dev), kscan_gpio_input_configs_##n(dev), INST_INPUT_LEN(n), \
GPIO_INT_DISABLE); \
} \
static void kscan_gpio_set_output_state_##n(struct device *dev, int value) \
{ \
for (int i = 0; i < INST_OUTPUT_LEN(n); i++) \
{ \
struct device *in_dev = kscan_gpio_output_devices_##n(dev)[i]; \
const struct kscan_gpio_item_config *cfg = &kscan_gpio_output_configs_##n(dev)[i]; \
gpio_pin_set(in_dev, cfg->pin, value); \
} \
} \
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) \
{ \
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; \
} \
static int kscan_gpio_read_##n(struct device *dev) \
{ \
bool submit_follow_up_read = false; \
struct kscan_gpio_data_##n *data = dev->driver_data; \
static bool read_state[INST_MATRIX_ROWS(n)][INST_MATRIX_COLS(n)]; \
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_##n(dev); \
kscan_gpio_set_output_state_##n(dev, 0); \
for (int o = 0; o < INST_OUTPUT_LEN(n); o++) \
{ \
struct device *out_dev = kscan_gpio_output_devices_##n(dev)[o]; \
const struct kscan_gpio_item_config *out_cfg = &kscan_gpio_output_configs_##n(dev)[o]; \
gpio_pin_set(out_dev, out_cfg->pin, 1); \
for (int i = 0; i < INST_INPUT_LEN(n); i++) \
{ \
struct device *in_dev = kscan_gpio_input_devices_##n(dev)[i]; \
const struct kscan_gpio_item_config *in_cfg = &kscan_gpio_input_configs_##n(dev)[i]; \
kscan_gpio_set_matrix_state_##n(read_state, i, o, gpio_pin_get(in_dev, in_cfg->pin) > 0); \
} \
gpio_pin_set(out_dev, out_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_output_state_##n(dev, 1); \
kscan_gpio_enable_interrupts_##n(dev); \
for (int r = 0; r < INST_MATRIX_ROWS(n); r++) \
{ \
for (int c = 0; c < INST_MATRIX_COLS(n); c++) \
{ \
bool pressed = read_state[r][c]; \
/* Follow up reads needed because further interrupts won't fire on already tripped input GPIO pins */ \
submit_follow_up_read = (submit_follow_up_read || pressed); \
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); \
} \
} \
} \
if (submit_follow_up_read) { \
COND_CODE_0(DT_INST_PROP(n, debounce_period), \
({ k_work_submit(&data->work); }), \
({ \
k_delayed_work_cancel(&data->work); \
k_delayed_work_submit(&data->work, K_MSEC(1)); })) \
} \
return 0; \
} \
static void kscan_gpio_work_handler_##n(struct k_work *work) \
{ \
struct kscan_gpio_data_##n *data = \
CONTAINER_OF(work, struct kscan_gpio_data_##n, work); \
kscan_gpio_read_##n(data->dev); \
} \
static void kscan_gpio_irq_callback_handler_##n(struct device *dev, \
struct gpio_callback *cb, gpio_port_pins_t pin) \
{ \
struct kscan_gpio_irq_callback_##n *data = \
CONTAINER_OF(cb, struct kscan_gpio_irq_callback_##n, callback); \
COND_CODE_0(DT_INST_PROP(n, debounce_period), \
({ k_work_submit(data->work); }), \
({ \
k_delayed_work_cancel(data->work); \
k_delayed_work_submit(data->work, K_MSEC(DT_INST_PROP(n, debounce_period))); })) \
} \
static struct kscan_gpio_data_##n kscan_gpio_data_##n = { \
.rows = { [INST_MATRIX_ROWS(n)-1] = NULL}, \
.cols = { [INST_MATRIX_COLS(n)-1] = NULL }\
}; \
static int kscan_gpio_configure_##n(struct device *dev, kscan_callback_t callback) \
{ \
struct kscan_gpio_data_##n *data = dev->driver_data; \
if (!callback) \
{ \
return -EINVAL; \
} \
data->callback = callback; \
return 0; \
} \
static int kscan_gpio_init_##n(struct device *dev) \
{ \
struct kscan_gpio_data_##n *data = dev->driver_data; \
int err; \
struct device **input_devices = kscan_gpio_input_devices_##n(dev); \
for (int i = 0; i < INST_INPUT_LEN(n); i++) \
{ \
const struct kscan_gpio_item_config *in_cfg = &kscan_gpio_input_configs_##n(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; \
} \
irq_callbacks_##n[i].work = &data->work; \
gpio_init_callback(&irq_callbacks_##n[i].callback, kscan_gpio_irq_callback_handler_##n, 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; \
} \
} \
struct device **output_devices = kscan_gpio_output_devices_##n(dev); \
for (int o = 0; o < INST_OUTPUT_LEN(n); o++) \
{ \
const struct kscan_gpio_item_config *out_cfg = &kscan_gpio_output_configs_##n(dev)[o]; \
output_devices[o] = device_get_binding(out_cfg->label); \
if (!output_devices[o]) \
{ \
LOG_ERR("Unable to find output GPIO device"); \
return -EINVAL; \
} \
err = gpio_pin_configure(output_devices[o], out_cfg->pin, GPIO_OUTPUT_ACTIVE | out_cfg->flags); \
if (err) \
{ \
LOG_ERR("Unable to configure pin %d on %s for output", out_cfg->pin, out_cfg->label); \
return err; \
} \
} \
data->dev = dev; \
(COND_CODE_0(DT_INST_PROP(n, debounce_period), (k_work_init), (k_delayed_work_init)))(&data->work, kscan_gpio_work_handler_##n); \
return 0; \
} \
static const struct kscan_driver_api gpio_driver_api_##n = { \
.config = kscan_gpio_configure_##n, \
.enable_callback = kscan_gpio_enable_interrupts_##n, \
.disable_callback = kscan_gpio_disable_interrupts_##n, \
}; \
static const struct kscan_gpio_config_##n kscan_gpio_config_##n = { \
.rows = { UTIL_LISTIFY(INST_MATRIX_ROWS(n), _KSCAN_GPIO_ROW_CFG_INIT, n) }, \
.cols = { UTIL_LISTIFY(INST_MATRIX_COLS(n), _KSCAN_GPIO_COL_CFG_INIT, n) }, \
}; \
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_##n);
DT_INST_FOREACH_STATUS_OKAY(GPIO_INST_INIT)
#endif /* DT_HAS_COMPAT_STATUS_OKAY(DT_DRV_COMPAT) */