refactor(kscan): Fix polling of GPIO matrices.
* Add easier macros for conditional polling/interrupt code. * Properly continue polling on intervals, without extra enable/disable code for pins that is superfluous when not trying to deal with interupts firing. * Fix to allow multiple GPIO drivers when doing splits w/ IO expanders
This commit is contained in:
Pete Johanson
parent
2f352788c1
commit
6c7ab0ce53
1 changed files with 78 additions and 66 deletions
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@ -51,6 +51,11 @@ static int kscan_gpio_config_interrupts(const struct device **devices,
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}
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#endif
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#define COND_POLLING(code) COND_CODE_1(CONFIG_ZMK_KSCAN_MATRIX_POLLING, (code), ())
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#define COND_INTERRUPTS(code) COND_CODE_1(CONFIG_ZMK_KSCAN_MATRIX_POLLING, (), (code))
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#define COND_POLL_OR_INTERRUPTS(pollcode, intcode) \
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COND_CODE_1(CONFIG_ZMK_KSCAN_MATRIX_POLLING, pollcode, intcode)
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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) \
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@ -61,19 +66,21 @@ static int kscan_gpio_config_interrupts(const struct device **devices,
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(INST_MATRIX_ROWS(n)))
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#define GPIO_INST_INIT(n) \
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COND_INTERRUPTS( \
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struct kscan_gpio_irq_callback_##n { \
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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 COND_CODE_0(DT_INST_PROP(n, debounce_period), (k_work), (k_delayed_work)) * \
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work; \
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struct gpio_callback callback; \
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const struct device *dev; \
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}; \
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static struct kscan_gpio_irq_callback_##n irq_callbacks_##n[INST_INPUT_LEN(n)]; \
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static struct kscan_gpio_irq_callback_##n irq_callbacks_##n[INST_INPUT_LEN(n)];) \
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struct kscan_gpio_config_##n { \
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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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kscan_callback_t callback; \
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COND_CODE_1(CONFIG_ZMK_KSCAN_MATRIX_POLLING, (struct k_timer poll_timer;), ()) \
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COND_POLLING(struct k_timer poll_timer;) \
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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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const struct device *rows[INST_MATRIX_ROWS(n)]; \
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@ -102,17 +109,16 @@ static int kscan_gpio_config_interrupts(const struct device **devices,
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return ( \
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COND_CODE_0(DT_ENUM_IDX(DT_DRV_INST(n), diode_direction), (cfg->rows), (cfg->cols))); \
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} \
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COND_CODE_1(CONFIG_ZMK_KSCAN_MATRIX_POLLING, (), \
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( \
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COND_INTERRUPTS( \
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static int kscan_gpio_enable_interrupts_##n(const struct device *dev) { \
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return kscan_gpio_config_interrupts( \
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kscan_gpio_input_devices_##n(dev), kscan_gpio_input_configs_##n(dev), \
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return kscan_gpio_config_interrupts(kscan_gpio_input_devices_##n(dev), \
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kscan_gpio_input_configs_##n(dev), \
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INST_INPUT_LEN(n), GPIO_INT_LEVEL_ACTIVE); \
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} static int kscan_gpio_disable_interrupts_##n(const struct device *dev) { \
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return kscan_gpio_config_interrupts(kscan_gpio_input_devices_##n(dev), \
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kscan_gpio_input_configs_##n(dev), \
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INST_INPUT_LEN(n), GPIO_INT_DISABLE); \
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})) \
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}) \
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static void kscan_gpio_set_output_state_##n(const struct device *dev, int value) { \
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int err; \
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for (int i = 0; i < INST_OUTPUT_LEN(n); i++) { \
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@ -132,17 +138,22 @@ static int kscan_gpio_config_interrupts(const struct device **devices,
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(output_index))] = value; \
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} \
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static int kscan_gpio_read_##n(const struct device *dev) { \
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bool submit_follow_up_read = false; \
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COND_INTERRUPTS(bool submit_follow_up_read = false;) \
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struct kscan_gpio_data_##n *data = dev->data; \
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static bool read_state[INST_MATRIX_ROWS(n)][INST_MATRIX_COLS(n)]; \
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int err; \
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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_set_output_state_##n(dev, 0); \
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COND_INTERRUPTS(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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const 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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err = gpio_pin_set(out_dev, out_cfg->pin, 1); \
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if (err) { \
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LOG_ERR("Failed to set output active (err %d)", err); \
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return err; \
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} \
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for (int i = 0; i < INST_INPUT_LEN(n); i++) { \
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const struct device *in_dev = kscan_gpio_input_devices_##n(dev)[i]; \
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const struct kscan_gpio_item_config *in_cfg = \
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@ -150,16 +161,20 @@ static int kscan_gpio_config_interrupts(const struct device **devices,
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kscan_gpio_set_matrix_state_##n(read_state, i, o, \
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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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err = gpio_pin_set(out_dev, out_cfg->pin, 0); \
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if (err) { \
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LOG_ERR("Failed to set output inactive (err %d)", err); \
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return err; \
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} \
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} \
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/* Set all our outputs as active again. */ \
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kscan_gpio_set_output_state_##n(dev, 1); \
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COND_INTERRUPTS(kscan_gpio_set_output_state_##n(dev, 1);) \
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for (int r = 0; r < INST_MATRIX_ROWS(n); r++) { \
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for (int c = 0; c < INST_MATRIX_COLS(n); c++) { \
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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 \
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* input GPIO pins */ \
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submit_follow_up_read = (submit_follow_up_read || pressed); \
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COND_INTERRUPTS(submit_follow_up_read = (submit_follow_up_read || pressed);) \
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if (pressed != data->matrix_state[r][c]) { \
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LOG_DBG("Sending event at %d,%d state %s", r, c, (pressed ? "on" : "off")); \
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data->matrix_state[r][c] = pressed; \
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@ -167,33 +182,31 @@ static int kscan_gpio_config_interrupts(const struct device **devices,
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} \
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} \
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} \
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COND_INTERRUPTS( \
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if (submit_follow_up_read) { \
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COND_CODE_0(DT_INST_PROP(n, debounce_period), ({ k_work_submit(&data->work); }), ({ \
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COND_CODE_0(DT_INST_PROP(n, debounce_period), ({ 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(5)); \
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})) \
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} else { \
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COND_CODE_1(CONFIG_ZMK_KSCAN_MATRIX_POLLING, (), \
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(kscan_gpio_enable_interrupts_##n(dev);)) \
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} \
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} else { kscan_gpio_enable_interrupts_##n(dev); }) \
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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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struct kscan_gpio_data_##n *data = 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( \
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COND_INTERRUPTS(static void kscan_gpio_irq_callback_handler_##n( \
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const struct device *dev, struct gpio_callback *cb, gpio_port_pins_t pin) { \
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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_1(CONFIG_ZMK_KSCAN_MATRIX_POLLING, (), \
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(kscan_gpio_disable_interrupts_##n(data->dev);)) \
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kscan_gpio_disable_interrupts_##n(data->dev); \
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COND_CODE_0(DT_INST_PROP(n, debounce_period), ({ k_work_submit(data->work); }), ({ \
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k_delayed_work_cancel(data->work); \
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k_delayed_work_submit(data->work, \
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K_MSEC(DT_INST_PROP(n, debounce_period))); \
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})) \
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} \
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}) \
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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}, .cols = {[INST_MATRIX_COLS(n) - 1] = NULL}}; \
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@ -207,25 +220,22 @@ static int kscan_gpio_config_interrupts(const struct device **devices,
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return 0; \
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}; \
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static int kscan_gpio_enable_##n(const struct device *dev) { \
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COND_CODE_1(CONFIG_ZMK_KSCAN_MATRIX_POLLING, \
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(struct kscan_gpio_data_##n *data = dev->data; \
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k_timer_start(&data->poll_timer, K_MSEC(10), K_MSEC(10)); return 0;), \
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COND_POLL_OR_INTERRUPTS((struct kscan_gpio_data_##n *data = dev->data; \
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k_timer_start(&data->poll_timer, K_MSEC(10), K_MSEC(10)); \
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return 0;), \
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(int err = kscan_gpio_enable_interrupts_##n(dev); \
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if (err) { return err; } return kscan_gpio_read_##n(dev);)) \
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}; \
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static int kscan_gpio_disable_##n(const struct device *dev) { \
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COND_CODE_1(CONFIG_ZMK_KSCAN_MATRIX_POLLING, \
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(struct kscan_gpio_data_##n *data = dev->data; \
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COND_POLL_OR_INTERRUPTS((struct kscan_gpio_data_##n *data = dev->data; \
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k_timer_stop(&data->poll_timer); return 0;), \
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(return kscan_gpio_disable_interrupts_##n(dev);)) \
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}; \
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COND_CODE_1(CONFIG_ZMK_KSCAN_MATRIX_POLLING, \
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(static void kscan_gpio_timer_handler(struct k_timer *timer) { \
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COND_POLLING(static void kscan_gpio_timer_handler_##n(struct k_timer *timer) { \
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struct kscan_gpio_data_##n *data = \
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CONTAINER_OF(timer, struct kscan_gpio_data_##n, poll_timer); \
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k_work_submit(&data->work.work); \
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}), \
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()) \
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}) \
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static int kscan_gpio_init_##n(const struct device *dev) { \
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struct kscan_gpio_data_##n *data = dev->data; \
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int err; \
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@ -244,15 +254,15 @@ static int kscan_gpio_config_interrupts(const struct device **devices,
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} else { \
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LOG_DBG("Configured pin %d on %s for input", in_cfg->pin, in_cfg->label); \
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} \
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irq_callbacks_##n[i].work = &data->work; \
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irq_callbacks_##n[i].dev = dev; \
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COND_INTERRUPTS( \
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irq_callbacks_##n[i].work = &data->work; irq_callbacks_##n[i].dev = dev; \
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gpio_init_callback(&irq_callbacks_##n[i].callback, \
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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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LOG_ERR("Error adding the callback to the column device"); \
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LOG_ERR("Error adding the callback to the input device"); \
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return err; \
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} \
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}) \
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} \
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const 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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@ -262,8 +272,8 @@ static int kscan_gpio_config_interrupts(const struct device **devices,
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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, \
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GPIO_OUTPUT_ACTIVE | out_cfg->flags); \
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err = \
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gpio_pin_configure(output_devices[o], out_cfg->pin, GPIO_OUTPUT | out_cfg->flags); \
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if (err) { \
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LOG_ERR("Unable to configure pin %d on %s for output", out_cfg->pin, \
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out_cfg->label); \
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@ -271,10 +281,12 @@ static int kscan_gpio_config_interrupts(const struct device **devices,
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} \
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} \
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data->dev = dev; \
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COND_CODE_1(CONFIG_ZMK_KSCAN_MATRIX_POLLING, \
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(k_timer_init(&data->poll_timer, kscan_gpio_timer_handler, NULL);), ()) \
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(COND_CODE_0(DT_INST_PROP(n, debounce_period), (k_work_init), (k_delayed_work_init)))( \
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&data->work, kscan_gpio_work_handler_##n); \
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COND_POLL_OR_INTERRUPTS( \
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(k_timer_init(&data->poll_timer, kscan_gpio_timer_handler_##n, NULL); \
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kscan_gpio_set_output_state_##n(dev, 0);), \
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(kscan_gpio_set_output_state_##n(dev, 1);)) \
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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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