Device migrations, driver migrations and more (#575)
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Ken Van Hoeylandt
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GitHub
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@@ -1,13 +1,22 @@
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// SPDX-License-Identifier: Apache-2.0
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#include <drivers/m5pm1.h>
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#include <m5pm1_module.h>
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#include <tactility/check.h>
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#include <tactility/device.h>
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#include <tactility/driver.h>
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#include <tactility/drivers/i2c_controller.h>
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#include <tactility/drivers/power_supply.h>
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#include <tactility/log.h>
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#include <freertos/FreeRTOS.h>
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#include <freertos/task.h>
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#define TAG "M5PM1"
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#include <new>
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constexpr auto* TAG = "M5PM1";
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// Rough LiPo discharge curve floor, used together with the configured reference voltage
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// (the 100% point) to estimate a charge percentage from the sensed battery voltage.
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static constexpr uint16_t POWER_SUPPLY_MIN_MV = 3200;
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// ---------------------------------------------------------------------------
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// Register map
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@@ -57,6 +66,127 @@ static constexpr TickType_t TIMEOUT = pdMS_TO_TICKS(50);
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#define GET_CONFIG(device) (static_cast<const M5pm1Config*>((device)->config))
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// ---------------------------------------------------------------------------
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// Power supply child device
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// ---------------------------------------------------------------------------
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static int estimate_capacity_from_mv(uint16_t battery_mv, uint32_t reference_mv) {
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if (battery_mv <= POWER_SUPPLY_MIN_MV) return 0;
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if (battery_mv >= reference_mv) return 100;
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return (battery_mv - POWER_SUPPLY_MIN_MV) * 100 / ((int)reference_mv - POWER_SUPPLY_MIN_MV);
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}
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static bool ps_supports_property(Device*, PowerSupplyProperty property) {
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return property == POWER_SUPPLY_PROP_IS_CHARGING ||
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property == POWER_SUPPLY_PROP_VOLTAGE ||
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property == POWER_SUPPLY_PROP_CAPACITY;
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}
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static error_t ps_get_property(Device* device, PowerSupplyProperty property, PowerSupplyPropertyValue* out_value) {
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// device_get_parent() here is the m5pm1 device itself (this child's parent), not the I2C bus.
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auto* parent = device_get_parent(device);
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if (property == POWER_SUPPLY_PROP_IS_CHARGING) {
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bool charging;
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error_t error = m5pm1_is_charging(parent, &charging);
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if (error != ERROR_NONE) return error;
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out_value->int_value = charging ? 1 : 0;
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return ERROR_NONE;
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}
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if (property == POWER_SUPPLY_PROP_VOLTAGE || property == POWER_SUPPLY_PROP_CAPACITY) {
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uint16_t battery_mv;
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error_t error = m5pm1_get_battery_voltage(parent, &battery_mv);
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if (error != ERROR_NONE) return error;
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out_value->int_value = (property == POWER_SUPPLY_PROP_VOLTAGE)
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? battery_mv
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: estimate_capacity_from_mv(battery_mv, GET_CONFIG(parent)->power_supply_reference_voltage_mv);
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return ERROR_NONE;
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}
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return ERROR_NOT_SUPPORTED;
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}
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static bool ps_supports_charge_control(Device*) { return false; }
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static bool ps_is_allowed_to_charge(Device*) { return false; }
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static error_t ps_set_allowed_to_charge(Device*, bool) { return ERROR_NOT_SUPPORTED; }
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static bool ps_supports_quick_charge(Device*) { return false; }
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static bool ps_is_quick_charge_enabled(Device*) { return false; }
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static error_t ps_set_quick_charge_enabled(Device*, bool) { return ERROR_NOT_SUPPORTED; }
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static bool ps_supports_power_off(Device*) { return true; }
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static error_t ps_power_off(Device* device) { return m5pm1_shutdown(device_get_parent(device)); }
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static constexpr PowerSupplyApi M5PM1_POWER_SUPPLY_API = {
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.supports_property = ps_supports_property,
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.get_property = ps_get_property,
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.supports_charge_control = ps_supports_charge_control,
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.is_allowed_to_charge = ps_is_allowed_to_charge,
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.set_allowed_to_charge = ps_set_allowed_to_charge,
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.supports_quick_charge = ps_supports_quick_charge,
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.is_quick_charge_enabled = ps_is_quick_charge_enabled,
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.set_quick_charge_enabled = ps_set_quick_charge_enabled,
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.supports_power_off = ps_supports_power_off,
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.power_off = ps_power_off,
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};
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// Registered (driver_construct_add() in module.cpp) so driver_bind() has a valid ->internal,
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// but never matched against a devicetree node: m5pm1_driver wires it up directly by pointer.
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Driver m5pm1_power_supply_driver = {
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.name = "m5pm1-power-supply",
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.compatible = (const char*[]) { "m5pm1-power-supply", nullptr },
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.start_device = nullptr,
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.stop_device = nullptr,
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.api = &M5PM1_POWER_SUPPLY_API,
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.device_type = &POWER_SUPPLY_TYPE,
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.owner = &m5pm1_module,
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.internal = nullptr
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};
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struct M5pm1Internal {
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Device* power_supply_device = nullptr;
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};
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static error_t create_power_supply_child(Device* parent, Device*& out_child) {
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auto* child = new(std::nothrow) Device { .address = 0, .name = "m5pm1-power-supply", .config = nullptr, .parent = nullptr, .internal = nullptr };
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if (child == nullptr) {
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return ERROR_OUT_OF_MEMORY;
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}
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error_t error = device_construct(child);
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if (error != ERROR_NONE) {
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delete child;
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return error;
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}
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device_set_parent(child, parent);
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device_set_driver(child, &m5pm1_power_supply_driver);
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error = device_add(child);
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if (error != ERROR_NONE) {
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device_destruct(child);
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delete child;
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return error;
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}
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error = device_start(child);
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if (error != ERROR_NONE) {
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device_remove(child);
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device_destruct(child);
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delete child;
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return error;
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}
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out_child = child;
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return ERROR_NONE;
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}
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static void destroy_power_supply_child(Device* child) {
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check(device_stop(child) == ERROR_NONE);
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check(device_remove(child) == ERROR_NONE);
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check(device_destruct(child) == ERROR_NONE);
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delete child;
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}
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// ---------------------------------------------------------------------------
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// Driver lifecycle
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// ---------------------------------------------------------------------------
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@@ -83,6 +213,19 @@ static error_t start(Device* device) {
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vTaskDelay(pdMS_TO_TICKS(20 * (attempt + 1)));
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}
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auto* internal = new(std::nothrow) M5pm1Internal();
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if (internal == nullptr) {
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return ERROR_OUT_OF_MEMORY;
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}
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error_t error = create_power_supply_child(device, internal->power_supply_device);
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if (error != ERROR_NONE) {
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delete internal;
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return error;
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}
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device_set_driver_data(device, internal);
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if (!awake) {
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LOG_E(TAG, "M5PM1 not responding — LCD power will not be enabled");
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return ERROR_NONE; // non-fatal: don't crash the kernel
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@@ -126,10 +269,22 @@ static error_t start(Device* device) {
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LOG_W(TAG, "Failed to configure speaker amp pin");
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}
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if (spk_ok && GET_CONFIG(device)->speaker_amp_enable_at_boot) {
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if (i2c_controller_register8_set_bits(i2c, addr, REG_GPIO_OUT, SPEAKER_AMP_BIT, TIMEOUT) == ERROR_NONE) {
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LOG_I(TAG, "Speaker amp enabled at boot");
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} else {
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LOG_W(TAG, "Failed to enable speaker amp at boot");
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}
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}
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return ERROR_NONE;
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}
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static error_t stop(Device* device) {
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auto* internal = static_cast<M5pm1Internal*>(device_get_driver_data(device));
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destroy_power_supply_child(internal->power_supply_device);
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device_set_driver_data(device, nullptr);
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delete internal;
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return ERROR_NONE;
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}
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