Device migrations and driver implementations (#564)
This commit is contained in:
Ken Van Hoeylandt
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@@ -0,0 +1,11 @@
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cmake_minimum_required(VERSION 3.20)
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include("${CMAKE_CURRENT_LIST_DIR}/../../Buildscripts/module.cmake")
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file(GLOB_RECURSE SOURCE_FILES "source/*.c*")
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tactility_add_module(tca9534-module
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SRCS ${SOURCE_FILES}
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INCLUDE_DIRS include/
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REQUIRES TactilityKernel
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)
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@@ -0,0 +1,195 @@
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Apache License
|
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==============
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_Version 2.0, January 2004_
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_<<http://www.apache.org/licenses/>>_
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### Terms and Conditions for use, reproduction, and distribution
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@@ -0,0 +1,7 @@
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# TCA9534 I/O expander
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A driver for the `TCA9534` 8-bit I2C-bus I/O expander by Texas Instruments.
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See https://www.ti.com/product/TCA9534
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License: [Apache v2.0](LICENSE-Apache-2.0.md)
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@@ -0,0 +1,5 @@
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description: TI TCA9534 8-bit I2C-bus I/O expander
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include: ["i2c-device.yaml"]
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compatible: "ti,tca9534"
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@@ -0,0 +1,3 @@
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dependencies:
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- TactilityKernel
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bindings: bindings
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@@ -0,0 +1,15 @@
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// SPDX-License-Identifier: Apache-2.0
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#pragma once
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#include <tactility/bindings/bindings.h>
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#include <drivers/tca9534.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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DEFINE_DEVICETREE(tca9534, struct Tca9534Config)
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#ifdef __cplusplus
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}
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#endif
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@@ -0,0 +1,17 @@
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// SPDX-License-Identifier: Apache-2.0
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#pragma once
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct Tca9534Config {
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/** Address on bus */
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uint8_t address;
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};
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#ifdef __cplusplus
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}
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#endif
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@@ -0,0 +1,14 @@
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// SPDX-License-Identifier: Apache-2.0
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#pragma once
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#include <tactility/module.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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extern struct Module tca9534_module;
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#ifdef __cplusplus
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}
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#endif
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@@ -0,0 +1,32 @@
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// SPDX-License-Identifier: Apache-2.0
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#include <tactility/check.h>
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#include <tactility/driver.h>
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#include <tactility/module.h>
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extern "C" {
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extern Driver tca9534_driver;
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static error_t start() {
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/* We crash when construct fails, because if a single driver fails to construct,
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* there is no guarantee that the previously constructed drivers can be destroyed */
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check(driver_construct_add(&tca9534_driver) == ERROR_NONE);
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return ERROR_NONE;
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}
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static error_t stop() {
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/* We crash when destruct fails, because if a single driver fails to destruct,
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* there is no guarantee that the previously destroyed drivers can be recovered */
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check(driver_remove_destruct(&tca9534_driver) == ERROR_NONE);
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return ERROR_NONE;
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}
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Module tca9534_module = {
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.name = "tca9534",
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.start = start,
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.stop = stop,
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.symbols = nullptr,
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.internal = nullptr
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};
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}
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@@ -0,0 +1,169 @@
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// SPDX-License-Identifier: Apache-2.0
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#include <drivers/tca9534.h>
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#include <tca9534_module.h>
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#include <tactility/device.h>
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#include <tactility/driver.h>
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#include <tactility/drivers/gpio_controller.h>
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#include <tactility/drivers/gpio_descriptor.h>
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#include <tactility/drivers/i2c_controller.h>
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#include <tactility/log.h>
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#define TAG "TCA9534"
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#define GET_CONFIG(device) (static_cast<const Tca9534Config*>((device)->config))
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constexpr auto TCA9534_REGISTER_INPUT = 0x00;
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constexpr auto TCA9534_REGISTER_OUTPUT = 0x01;
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constexpr auto TCA9534_REGISTER_POLARITY = 0x02;
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constexpr auto TCA9534_REGISTER_CONFIG = 0x03;
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static error_t start(Device* device) {
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auto* parent = device_get_parent(device);
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if (device_get_type(parent) != &I2C_CONTROLLER_TYPE) {
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LOG_E(TAG, "Parent device is not I2C");
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return ERROR_RESOURCE;
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}
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return gpio_controller_init_descriptors(device, 8, nullptr);
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}
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static error_t stop(Device* device) {
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check(gpio_controller_deinit_descriptors(device) == ERROR_NONE);
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return ERROR_NONE;
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}
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extern "C" {
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static error_t set_level(GpioDescriptor* descriptor, bool high) {
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auto* device = descriptor->controller;
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auto* parent = device_get_parent(device);
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auto address = GET_CONFIG(device)->address;
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uint8_t bit = 1 << descriptor->pin;
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return high
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? i2c_controller_register8_set_bits(parent, address, TCA9534_REGISTER_OUTPUT, bit, portMAX_DELAY)
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: i2c_controller_register8_reset_bits(parent, address, TCA9534_REGISTER_OUTPUT, bit, portMAX_DELAY);
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}
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static error_t get_level(GpioDescriptor* descriptor, bool* high) {
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auto* device = descriptor->controller;
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auto* parent = device_get_parent(device);
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auto address = GET_CONFIG(device)->address;
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uint8_t bits;
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error_t err = i2c_controller_register8_get(parent, address, TCA9534_REGISTER_INPUT, &bits, portMAX_DELAY);
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if (err != ERROR_NONE) {
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return err;
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}
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*high = (bits & (1 << descriptor->pin)) != 0;
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return ERROR_NONE;
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}
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static error_t set_flags(GpioDescriptor* descriptor, gpio_flags_t flags) {
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// The TCA9534 only supports direction and polarity inversion. Pull-up/down and
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// high-impedance are not present in its register map.
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if (flags & (GPIO_FLAG_PULL_UP | GPIO_FLAG_PULL_DOWN | GPIO_FLAG_HIGH_IMPEDANCE)) {
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return ERROR_NOT_SUPPORTED;
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||||
}
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||||
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||||
// The polarity register only inverts what's read back from an input pin;
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||||
// set_level() still drives outputs at the raw level. Accepting ACTIVE_LOW
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// on an output would silently not do what it implies.
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if ((flags & GPIO_FLAG_ACTIVE_LOW) && (flags & GPIO_FLAG_DIRECTION_OUTPUT)) {
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return ERROR_NOT_SUPPORTED;
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}
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||||
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auto* device = descriptor->controller;
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||||
auto* parent = device_get_parent(device);
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||||
auto address = GET_CONFIG(device)->address;
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||||
uint8_t bit = 1 << descriptor->pin;
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||||
error_t err;
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||||
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// Direction: configuration bit is 1 for input, 0 for output.
|
||||
if (flags & GPIO_FLAG_DIRECTION_OUTPUT) {
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||||
err = i2c_controller_register8_reset_bits(parent, address, TCA9534_REGISTER_CONFIG, bit, portMAX_DELAY);
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||||
} else {
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||||
err = i2c_controller_register8_set_bits(parent, address, TCA9534_REGISTER_CONFIG, bit, portMAX_DELAY);
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||||
}
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||||
|
||||
if (err != ERROR_NONE) {
|
||||
return err;
|
||||
}
|
||||
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||||
// Polarity inversion (mainly relevant for active-low inputs).
|
||||
if (flags & GPIO_FLAG_ACTIVE_LOW) {
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||||
err = i2c_controller_register8_set_bits(parent, address, TCA9534_REGISTER_POLARITY, bit, portMAX_DELAY);
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||||
} else {
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||||
err = i2c_controller_register8_reset_bits(parent, address, TCA9534_REGISTER_POLARITY, bit, portMAX_DELAY);
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||||
}
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||||
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||||
return err;
|
||||
}
|
||||
|
||||
static error_t get_flags(GpioDescriptor* descriptor, gpio_flags_t* flags) {
|
||||
auto* device = descriptor->controller;
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||||
auto* parent = device_get_parent(device);
|
||||
auto address = GET_CONFIG(device)->address;
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||||
uint8_t bit = 1 << descriptor->pin;
|
||||
uint8_t val;
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error_t err;
|
||||
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gpio_flags_t f = GPIO_FLAG_NONE;
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||||
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||||
err = i2c_controller_register8_get(parent, address, TCA9534_REGISTER_CONFIG, &val, portMAX_DELAY);
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||||
if (err != ERROR_NONE) return err;
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||||
f |= (val & bit) ? GPIO_FLAG_DIRECTION_INPUT : GPIO_FLAG_DIRECTION_OUTPUT;
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||||
|
||||
err = i2c_controller_register8_get(parent, address, TCA9534_REGISTER_POLARITY, &val, portMAX_DELAY);
|
||||
if (err != ERROR_NONE) return err;
|
||||
f |= (val & bit) ? GPIO_FLAG_ACTIVE_LOW : GPIO_FLAG_ACTIVE_HIGH;
|
||||
|
||||
*flags = f;
|
||||
return ERROR_NONE;
|
||||
}
|
||||
|
||||
static error_t get_native_pin_number(GpioDescriptor* descriptor, void* pin_number) {
|
||||
return ERROR_NOT_SUPPORTED;
|
||||
}
|
||||
|
||||
static error_t add_callback(GpioDescriptor* descriptor, void (*callback)(void*), void* arg) {
|
||||
return ERROR_NOT_SUPPORTED;
|
||||
}
|
||||
|
||||
static error_t remove_callback(GpioDescriptor* descriptor) {
|
||||
return ERROR_NOT_SUPPORTED;
|
||||
}
|
||||
|
||||
static error_t enable_interrupt(GpioDescriptor* descriptor) {
|
||||
return ERROR_NOT_SUPPORTED;
|
||||
}
|
||||
|
||||
static error_t disable_interrupt(GpioDescriptor* descriptor) {
|
||||
return ERROR_NOT_SUPPORTED;
|
||||
}
|
||||
|
||||
const static GpioControllerApi tca9534_gpio_api = {
|
||||
.set_level = set_level,
|
||||
.get_level = get_level,
|
||||
.set_flags = set_flags,
|
||||
.get_flags = get_flags,
|
||||
.get_native_pin_number = get_native_pin_number,
|
||||
.add_callback = add_callback,
|
||||
.remove_callback = remove_callback,
|
||||
.enable_interrupt = enable_interrupt,
|
||||
.disable_interrupt = disable_interrupt
|
||||
};
|
||||
|
||||
Driver tca9534_driver = {
|
||||
.name = "tca9534",
|
||||
.compatible = (const char*[]) { "ti,tca9534", nullptr },
|
||||
.start_device = start,
|
||||
.stop_device = stop,
|
||||
.api = static_cast<const void*>(&tca9534_gpio_api),
|
||||
.device_type = &GPIO_CONTROLLER_TYPE,
|
||||
.owner = &tca9534_module,
|
||||
.internal = nullptr
|
||||
};
|
||||
|
||||
}
|
||||
Reference in New Issue
Block a user