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zephyr/drivers/input/input_cst816s.c

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/*
* Copyright (c) 2021 Qingsong Gou <gouqs@hotmail.com>
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT hynitron_cst816s
#include <zephyr/sys/byteorder.h>
#include <zephyr/input/input.h>
#include <zephyr/drivers/i2c.h>
#include <zephyr/drivers/gpio.h>
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(cst816s, CONFIG_INPUT_LOG_LEVEL);
#define CST816S_CHIP_ID1 0xB4
#define CST816S_CHIP_ID2 0xB5
#define CST816S_REG_DATA 0x00
#define CST816S_REG_GESTURE_ID 0x01
#define CST816S_REG_FINGER_NUM 0x02
#define CST816S_REG_XPOS_H 0x03
#define CST816S_REG_XPOS_L 0x04
#define CST816S_REG_YPOS_H 0x05
#define CST816S_REG_YPOS_L 0x06
#define CST816S_REG_BPC0H 0xB0
#define CST816S_REG_BPC0L 0xB1
#define CST816S_REG_BPC1H 0xB2
#define CST816S_REG_BPC1L 0xB3
#define CST816S_REG_POWER_MODE 0xA5
#define CST816S_REG_CHIP_ID 0xA7
#define CST816S_REG_PROJ_ID 0xA8
#define CST816S_REG_FW_VERSION 0xA9
#define CST816S_REG_MOTION_MASK 0xEC
#define CST816S_REG_IRQ_PULSE_WIDTH 0xED
#define CST816S_REG_NOR_SCAN_PER 0xEE
#define CST816S_REG_MOTION_S1_ANGLE 0xEF
#define CST816S_REG_LP_SCAN_RAW1H 0xF0
#define CST816S_REG_LP_SCAN_RAW1L 0xF1
#define CST816S_REG_LP_SCAN_RAW2H 0xF2
#define CST816S_REG_LP_SCAN_RAW2L 0xF3
#define CST816S_REG_LP_AUTO_WAKEUP_TIME 0xF4
#define CST816S_REG_LP_SCAN_TH 0xF5
#define CST816S_REG_LP_SCAN_WIN 0xF6
#define CST816S_REG_LP_SCAN_FREQ 0xF7
#define CST816S_REG_LP_SCAN_I_DAC 0xF8
#define CST816S_REG_AUTOSLEEP_TIME 0xF9
#define CST816S_REG_IRQ_CTL 0xFA
#define CST816S_REG_DEBOUNCE_TIME 0xFB
#define CST816S_REG_LONG_PRESS_TIME 0xFC
#define CST816S_REG_IOCTL 0xFD
#define CST816S_REG_DIS_AUTO_SLEEP 0xFE
#define CST816S_MOTION_EN_CON_LR BIT(2)
#define CST816S_MOTION_EN_CON_UR BIT(1)
#define CST816S_MOTION_EN_DCLICK BIT(0)
#define CST816S_IRQ_EN_TEST BIT(7)
#define CST816S_IRQ_EN_TOUCH BIT(6)
#define CST816S_IRQ_EN_CHANGE BIT(5)
#define CST816S_IRQ_EN_MOTION BIT(4)
#define CST816S_IRQ_ONCE_WLP BIT(0)
#define CST816S_IOCTL_SOFT_RTS BIT(2)
#define CST816S_IOCTL_IIC_OD BIT(1)
#define CST816S_IOCTL_EN_1V8 BIT(0)
#define CST816S_POWER_MODE_SLEEP (0x03)
#define CST816S_POWER_MODE_EXPERIMENTAL (0x05)
#define CST816S_EVENT_BITS_POS (0x06)
#define CST816S_RESET_DELAY (5) /* in ms */
#define CST816S_WAIT_DELAY (50) /* in ms */
#define EVENT_PRESS_DOWN 0x00U
#define EVENT_LIFT_UP 0x01U
#define EVENT_CONTACT 0x02U
#define EVENT_NONE 0x03U
/** cst816s configuration (DT). */
struct cst816s_config {
struct i2c_dt_spec i2c;
const struct gpio_dt_spec rst_gpio;
#ifdef CONFIG_INPUT_CST816S_INTERRUPT
const struct gpio_dt_spec int_gpio;
#endif
};
/** cst816s data. */
struct cst816s_data {
/** Device pointer. */
const struct device *dev;
/** Work queue (for deferred read). */
struct k_work work;
#ifdef CONFIG_INPUT_CST816S_INTERRUPT
/** Interrupt GPIO callback. */
struct gpio_callback int_gpio_cb;
#else
/** Timer (polling mode). */
struct k_timer timer;
#endif
};
static int cst816s_process(const struct device *dev)
{
const struct cst816s_config *cfg = dev->config;
int r;
uint8_t event;
uint16_t row, col;
bool pressed;
uint16_t x;
uint16_t y;
r = i2c_burst_read_dt(&cfg->i2c, CST816S_REG_XPOS_H, (uint8_t *)&x, sizeof(x));
if (r < 0) {
LOG_ERR("Could not read x data");
return r;
}
r = i2c_burst_read_dt(&cfg->i2c, CST816S_REG_YPOS_H, (uint8_t *)&y, sizeof(y));
if (r < 0) {
LOG_ERR("Could not read y data");
return r;
}
col = sys_be16_to_cpu(x) & 0x0fff;
row = sys_be16_to_cpu(y) & 0x0fff;
event = (x & 0xff) >> CST816S_EVENT_BITS_POS;
pressed = (event == EVENT_PRESS_DOWN) || (event == EVENT_CONTACT);
LOG_DBG("event: %d, row: %d, col: %d", event, row, col);
if (pressed) {
input_report_abs(dev, INPUT_ABS_X, col, false, K_FOREVER);
input_report_abs(dev, INPUT_ABS_Y, row, 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);
}
return r;
}
static void cst816s_work_handler(struct k_work *work)
{
struct cst816s_data *data = CONTAINER_OF(work, struct cst816s_data, work);
cst816s_process(data->dev);
}
#ifdef CONFIG_INPUT_CST816S_INTERRUPT
static void cst816s_isr_handler(const struct device *dev, struct gpio_callback *cb, uint32_t pins)
{
struct cst816s_data *data = CONTAINER_OF(cb, struct cst816s_data, int_gpio_cb);
k_work_submit(&data->work);
}
#else
static void cst816s_timer_handler(struct k_timer *timer)
{
struct cst816s_data *data = CONTAINER_OF(timer, struct cst816s_data, timer);
k_work_submit(&data->work);
}
#endif
static void cst816s_chip_reset(const struct device *dev)
{
const struct cst816s_config *config = dev->config;
int ret;
if (gpio_is_ready_dt(&config->rst_gpio)) {
ret = gpio_pin_configure_dt(&config->rst_gpio, GPIO_OUTPUT_ACTIVE);
if (ret < 0) {
LOG_ERR("Could not configure reset GPIO pin");
return;
}
k_msleep(CST816S_RESET_DELAY);
gpio_pin_set_dt(&config->rst_gpio, 0);
k_msleep(CST816S_WAIT_DELAY);
}
}
static int cst816s_chip_init(const struct device *dev)
{
const struct cst816s_config *cfg = dev->config;
int ret = 0;
uint8_t chip_id = 0;
cst816s_chip_reset(dev);
if (!device_is_ready(cfg->i2c.bus)) {
LOG_ERR("I2C bus %s not ready", cfg->i2c.bus->name);
return -ENODEV;
}
ret = i2c_reg_read_byte_dt(&cfg->i2c, CST816S_REG_CHIP_ID, &chip_id);
if (ret < 0) {
LOG_ERR("failed reading chip id");
return ret;
}
if ((chip_id != CST816S_CHIP_ID1) && (chip_id != CST816S_CHIP_ID2)) {
LOG_ERR("CST816S wrong chip id: returned 0x%x", chip_id);
return -ENODEV;
}
ret = i2c_reg_update_byte_dt(&cfg->i2c, CST816S_REG_IRQ_CTL,
CST816S_IRQ_EN_TOUCH | CST816S_IRQ_EN_CHANGE,
CST816S_IRQ_EN_TOUCH | CST816S_IRQ_EN_CHANGE);
if (ret < 0) {
LOG_ERR("Could not enable irq");
return ret;
}
return ret;
}
static int cst816s_init(const struct device *dev)
{
struct cst816s_data *data = dev->data;
data->dev = dev;
k_work_init(&data->work, cst816s_work_handler);
#ifdef CONFIG_INPUT_CST816S_INTERRUPT
const struct cst816s_config *config = dev->config;
int ret;
if (!gpio_is_ready_dt(&config->int_gpio)) {
LOG_ERR("GPIO port %s not ready", config->int_gpio.port->name);
return -ENODEV;
}
ret = gpio_pin_configure_dt(&config->int_gpio, GPIO_INPUT);
if (ret < 0) {
LOG_ERR("Could not configure interrupt GPIO pin");
return ret;
}
ret = gpio_pin_interrupt_configure_dt(&config->int_gpio, GPIO_INT_EDGE_TO_ACTIVE);
if (ret < 0) {
LOG_ERR("Could not configure interrupt GPIO interrupt.");
return ret;
}
gpio_init_callback(&data->int_gpio_cb, cst816s_isr_handler, BIT(config->int_gpio.pin));
ret = gpio_add_callback(config->int_gpio.port, &data->int_gpio_cb);
if (ret < 0) {
LOG_ERR("Could not set gpio callback");
return ret;
}
#else
k_timer_init(&data->timer, cst816s_timer_handler, NULL);
k_timer_start(&data->timer, K_MSEC(CONFIG_INPUT_CST816S_PERIOD),
K_MSEC(CONFIG_INPUT_CST816S_PERIOD));
#endif
return cst816s_chip_init(dev);
}
#define CST816S_DEFINE(index) \
static const struct cst816s_config cst816s_config_##index = { \
.i2c = I2C_DT_SPEC_INST_GET(index), \
COND_CODE_1(CONFIG_INPUT_CST816S_INTERRUPT, \
(.int_gpio = GPIO_DT_SPEC_INST_GET(index, irq_gpios),), ()) \
.rst_gpio = GPIO_DT_SPEC_INST_GET_OR(index, rst_gpios, {}), \
}; \
static struct cst816s_data cst816s_data_##index; \
DEVICE_DT_INST_DEFINE(index, cst816s_init, NULL, &cst816s_data_##index, \
&cst816s_config_##index, POST_KERNEL, CONFIG_INPUT_INIT_PRIORITY, \
NULL);
DT_INST_FOREACH_STATUS_OKAY(CST816S_DEFINE)
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