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This commit adds basic ili2132a touch controller driver. Signed-off-by: Joel Jaldemark <joeljaldemark@outlook.com>pull/79608/head
6 changed files with 176 additions and 0 deletions
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# Copyright (c) 2024 Joel Jaldemark |
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# SPDX-License-Identifier: Apache-2.0 |
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config INPUT_ILI2132A |
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bool "ILI2132A capacitive touch controller driver" |
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default y |
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depends on DT_HAS_ILITEK_ILI2132A_ENABLED |
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select I2C |
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help |
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Enable driver for ilitek ili2132a touch controller |
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/*
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* Copyright (c) 2024 Joel Jaldemark |
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* |
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* SPDX-License-Identifier: Apache-2.0 |
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*/ |
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#define DT_DRV_COMPAT ilitek_ili2132a |
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#include <zephyr/drivers/gpio.h> |
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#include <zephyr/drivers/i2c.h> |
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#include <zephyr/input/input.h> |
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#include <zephyr/pm/device.h> |
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#include <zephyr/sys/byteorder.h> |
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#include <zephyr/logging/log.h> |
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LOG_MODULE_REGISTER(ili2132a, CONFIG_INPUT_LOG_LEVEL); |
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#define IS_TOUCHED_BIT 0x40 |
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#define TIP 1 |
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#define X_COORD 2 |
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#define Y_COORD 4 |
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struct ili2132a_data { |
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const struct device *dev; |
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struct gpio_callback gpio_cb; |
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struct k_work work; |
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}; |
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struct ili2132a_config { |
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struct i2c_dt_spec i2c; |
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struct gpio_dt_spec rst; |
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struct gpio_dt_spec irq; |
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}; |
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static void gpio_isr(const struct device *dev, struct gpio_callback *cb, uint32_t pin) |
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{ |
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struct ili2132a_data *data = CONTAINER_OF(cb, struct ili2132a_data, gpio_cb); |
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k_work_submit(&data->work); |
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} |
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static void ili2132a_process(const struct device *dev) |
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{ |
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const struct ili2132a_config *dev_cfg = dev->config; |
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uint8_t buf[8]; |
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uint16_t x, y; |
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i2c_read_dt(&dev_cfg->i2c, buf, sizeof(buf)); |
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if (buf[TIP] & IS_TOUCHED_BIT) { |
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x = sys_get_le16(&buf[X_COORD]); |
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y = sys_get_le16(&buf[Y_COORD]); |
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input_report_abs(dev, INPUT_ABS_X, x, false, K_FOREVER); |
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input_report_abs(dev, INPUT_ABS_Y, y, false, K_FOREVER); |
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input_report_key(dev, INPUT_BTN_TOUCH, 1, true, K_FOREVER); |
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} else { |
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input_report_key(dev, INPUT_BTN_TOUCH, 0, true, K_FOREVER); |
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} |
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} |
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static void ili2132a_work_handler(struct k_work *work_item) |
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{ |
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struct ili2132a_data *data = CONTAINER_OF(work_item, struct ili2132a_data, work); |
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ili2132a_process(data->dev); |
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} |
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static int ili2132a_init(const struct device *dev) |
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{ |
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struct ili2132a_data *data = dev->data; |
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const struct ili2132a_config *dev_cfg = dev->config; |
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int ret; |
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if (!i2c_is_ready_dt(&dev_cfg->i2c)) { |
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LOG_ERR("%s is not ready", dev_cfg->i2c.bus->name); |
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return -ENODEV; |
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} |
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if (!gpio_is_ready_dt(&dev_cfg->rst)) { |
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LOG_ERR("Reset GPIO controller device not ready"); |
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return -ENODEV; |
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} |
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if (!gpio_is_ready_dt(&dev_cfg->irq)) { |
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LOG_ERR("Interrupt GPIO controller device not ready"); |
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return -ENODEV; |
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} |
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data->dev = dev; |
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ret = gpio_pin_configure_dt(&dev_cfg->irq, GPIO_INPUT); |
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if (ret < 0) { |
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LOG_ERR("Could not configure interrupt gpio"); |
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return ret; |
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} |
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ret = gpio_pin_configure_dt(&dev_cfg->rst, GPIO_OUTPUT_ACTIVE); |
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if (ret < 0) { |
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LOG_ERR("Could not configure reset gpio"); |
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return ret; |
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} |
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ret = gpio_pin_set_dt(&dev_cfg->rst, 0); |
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if (ret < 0) { |
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return ret; |
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} |
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gpio_init_callback(&data->gpio_cb, gpio_isr, BIT(dev_cfg->irq.pin)); |
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ret = gpio_add_callback(dev_cfg->irq.port, &data->gpio_cb); |
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if (ret < 0) { |
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LOG_ERR("Could not set gpio callback"); |
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return ret; |
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} |
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ret = gpio_pin_interrupt_configure_dt(&dev_cfg->irq, GPIO_INT_EDGE_FALLING); |
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if (ret < 0) { |
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LOG_ERR("Could not configure interrupt"); |
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return ret; |
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} |
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k_work_init(&data->work, ili2132a_work_handler); |
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return 0; |
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} |
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#define ILI2132A_INIT(index) \ |
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static const struct ili2132a_config ili2132a_config_##index = { \ |
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.i2c = I2C_DT_SPEC_INST_GET(index), \ |
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.rst = GPIO_DT_SPEC_INST_GET(index, rst_gpios), \ |
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.irq = GPIO_DT_SPEC_INST_GET(index, irq_gpios), \ |
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}; \ |
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static struct ili2132a_data ili2132a_data_##index; \ |
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DEVICE_DT_INST_DEFINE(index, ili2132a_init, NULL, &ili2132a_data_##index, \ |
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&ili2132a_config_##index, POST_KERNEL, CONFIG_INPUT_INIT_PRIORITY, \ |
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NULL); |
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DT_INST_FOREACH_STATUS_OKAY(ILI2132A_INIT) |
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# Copyright (c) 2024 Joel Jaldemark |
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# SPDX-License-Identifier: Apache-2.0 |
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description: ILI2132A capacitive touch controller |
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compatible: "ilitek,ili2132a" |
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include: i2c-device.yaml |
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properties: |
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irq-gpios: |
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type: phandle-array |
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required: true |
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description: | |
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Interrupt pin |
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rst-gpios: |
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type: phandle-array |
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required: true |
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description: | |
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Reset pin |
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