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drivers: input: ili2132a: add support for ili2132a touch controller
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This commit adds basic ili2132a touch controller driver.

Signed-off-by: Joel Jaldemark <joeljaldemark@outlook.com>
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@Jaldemark
Jaldemark committed Oct 2, 2024
1 parent cdf6abc commit e31f3a0
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Showing 3 changed files with 85 additions and 80 deletions.
7 changes: 2 additions & 5 deletions drivers/input/Kconfig.ili2132a
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#
#Copyright (c) 2024 Joel Jaldemark
#
#SPDX-License-Identifier: Apache-2.0
#
#
menuconfig INPUT_ILI2132A

config INPUT_ILI2132A
bool "ILI2132A capacitive touch controller driver"
default y
depends on DT_HAS_ILITEK_ILI2132A_ENABLED
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157 changes: 82 additions & 75 deletions drivers/input/input_ili2132a.c
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#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(ili2132a, CONFIG_INPUT_LOG_LEVEL);

#define IS_TOUCHED_BIT 0x40

struct ili2132a_data {
const struct device *dev;
struct gpio_callback gpio_cb;
struct k_work work;
const struct device *dev;
struct gpio_callback gpio_cb;
struct k_work work;
};

struct ili2132a_config {
struct i2c_dt_spec bus;
struct gpio_dt_spec rst;
struct gpio_dt_spec irq;
struct i2c_dt_spec bus;
struct gpio_dt_spec rst;
struct gpio_dt_spec irq;
};

static void gpio_isr(const struct device *dev, struct gpio_callback *cb,
uint32_t pin)
static void gpio_isr(const struct device *dev, struct gpio_callback *cb, uint32_t pin)
{
struct ili2132a_data *data = CONTAINER_OF(cb, struct ili2132a_data, gpio_cb);
k_work_submit(&data->work);
struct ili2132a_data *data = CONTAINER_OF(cb, struct ili2132a_data, gpio_cb);

k_work_submit(&data->work);
}

static void ili2132a_process(const struct device *dev)
{
const struct ili2132a_config *dev_cfg = dev->config;
uint8_t buf[8];
uint16_t x, y;

i2c_read_dt(&dev_cfg->bus, buf, 8);
if (buf[1] & 0x40) {
x = (buf[3] << 8) + buf[2];
y = (buf[5] << 8) + buf[4];
input_report_abs(dev, INPUT_ABS_X, x, false, K_FOREVER);
input_report_abs(dev, INPUT_ABS_Y, y, false, K_FOREVER);
input_report_key(dev, INPUT_BTN_TOUCH, 1, true, K_FOREVER);
} else {
input_report_key(dev, INPUT_BTN_TOUCH, 0, true, K_FOREVER);
}
const struct ili2132a_config *dev_cfg = dev->config;
uint8_t buf[8];
uint16_t x, y;

i2c_read_dt(&dev_cfg->bus, buf, sizeof(buf));
if (buf[1] & IS_TOUCHED_BIT) {
x = (buf[3] << 8) + buf[2];
y = (buf[5] << 8) + buf[4];
input_report_abs(dev, INPUT_ABS_X, x, false, K_FOREVER);
input_report_abs(dev, INPUT_ABS_Y, y, false, K_FOREVER);
input_report_key(dev, INPUT_BTN_TOUCH, 1, true, K_FOREVER);
} else {
input_report_key(dev, INPUT_BTN_TOUCH, 0, true, K_FOREVER);
}
}

static void ili2132a_work_handler(struct k_work *work_item)
{
struct ili2132a_data *data = CONTAINER_OF(work_item, struct ili2132a_data, work);
ili2132a_process(data->dev);
struct ili2132a_data *data = CONTAINER_OF(work_item, struct ili2132a_data, work);

ili2132a_process(data->dev);
}

int ili2132a_init(const struct device *dev)
{
struct ili2132a_data *data = dev->data;
const struct ili2132a_config *dev_cfg = dev->config;
int ret;

if (!i2c_is_ready_dt(&dev_cfg->bus)) {
LOG_ERR("I2C controller device not ready");
}

data->dev = dev;

ret = gpio_pin_configure_dt(&dev_cfg->irq, GPIO_INPUT);
if (ret < 0) {
LOG_ERR("Could not configure interrupt gpio");
return ret;
}
ret = gpio_pin_configure_dt(&dev_cfg->rst, GPIO_OUTPUT_ACTIVE);
if (ret < 0) {
LOG_ERR("Could not configure reset gpio");
return ret;
}
ret = gpio_pin_set_dt(&dev_cfg->rst, 0);
if (ret < 0) {
return ret;
}

gpio_init_callback(&data->gpio_cb, gpio_isr, BIT(dev_cfg->irq.pin));
ret = gpio_add_callback(dev_cfg->irq.port, &data->gpio_cb);
if (ret < 0) {
LOG_ERR("Could not set gpio callback");
return ret;
}
ret = gpio_pin_interrupt_configure_dt(&dev_cfg->irq, GPIO_INT_EDGE_FALLING);
if (ret < 0) {
LOG_ERR("Could not configure intterupt");
return ret;
}
k_work_init(&data->work, ili2132a_work_handler);

return 0;
struct ili2132a_data *data = dev->data;
const struct ili2132a_config *dev_cfg = dev->config;
int ret;

if (!i2c_is_ready_dt(&dev_cfg->bus)) {
LOG_ERR("I2C controller device not ready");
}

data->dev = dev;

ret = gpio_pin_configure_dt(&dev_cfg->irq, GPIO_INPUT);
if (ret < 0) {
LOG_ERR("Could not configure interrupt gpio");
return ret;
}

ret = gpio_pin_configure_dt(&dev_cfg->rst, GPIO_OUTPUT_ACTIVE);
if (ret < 0) {
LOG_ERR("Could not configure reset gpio");
return ret;
}

ret = gpio_pin_set_dt(&dev_cfg->rst, 0);
if (ret < 0) {
return ret;
}

gpio_init_callback(&data->gpio_cb, gpio_isr, BIT(dev_cfg->irq.pin));
ret = gpio_add_callback(dev_cfg->irq.port, &data->gpio_cb);
if (ret < 0) {
LOG_ERR("Could not set gpio callback");
return ret;
}

ret = gpio_pin_interrupt_configure_dt(&dev_cfg->irq, GPIO_INT_EDGE_FALLING);
if (ret < 0) {
LOG_ERR("Could not configure intterupt");
return ret;
}

k_work_init(&data->work, ili2132a_work_handler);

return 0;
}
#define ILI2132A_INIT(index) \
static const struct ili2132a_config ili2132a_config_##index = { \
.bus = I2C_DT_SPEC_INST_GET(index), \
.rst = GPIO_DT_SPEC_INST_GET(index, rst_gpios), \
.irq = GPIO_DT_SPEC_INST_GET(index, irq_gpios), \
}; \
static struct ili2132a_data ili2132a_data_##index; \
DEVICE_DT_INST_DEFINE(index, ili2132a_init, NULL, \
&ili2132a_data_##index, &ili2132a_config_##index,\
POST_KERNEL, CONFIG_INPUT_INIT_PRIORITY, NULL);
#define ILI2132A_INIT(index) \
static const struct ili2132a_config ili2132a_config_##index = { \
.bus = I2C_DT_SPEC_INST_GET(index), \
.rst = GPIO_DT_SPEC_INST_GET(index, rst_gpios), \
.irq = GPIO_DT_SPEC_INST_GET(index, irq_gpios), \
}; \
static struct ili2132a_data ili2132a_data_##index; \
DEVICE_DT_INST_DEFINE(index, ili2132a_init, NULL, &ili2132a_data_##index, \
&ili2132a_config_##index, POST_KERNEL, CONFIG_INPUT_INIT_PRIORITY, \
NULL);

DT_INST_FOREACH_STATUS_OKAY(ILI2132A_INIT)
1 change: 1 addition & 0 deletions dts/bindings/input/ilitek,ili2132a.yaml
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# Copyright (c) 2024 Joel Jaldemark
# SPDX-License-Identifier: Apache-2.0

description: ILI2143A capactitive touch controller

compatible: "ilitek,ili2132a"
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