328 lines
9.0 KiB
C
328 lines
9.0 KiB
C
/*
|
|
* 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/drivers/kscan.h>
|
|
#include <zephyr/drivers/i2c.h>
|
|
#include <zephyr/drivers/gpio.h>
|
|
#include <zephyr/logging/log.h>
|
|
|
|
LOG_MODULE_REGISTER(cst816s, CONFIG_KSCAN_LOG_LEVEL);
|
|
|
|
#define CST816S_CHIP_ID 0xB4
|
|
|
|
#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_KSCAN_CST816S_INTERRUPT
|
|
const struct gpio_dt_spec int_gpio;
|
|
#endif
|
|
};
|
|
|
|
/** cst816s data. */
|
|
struct cst816s_data {
|
|
/** Device pointer. */
|
|
const struct device *dev;
|
|
/** KSCAN Callback. */
|
|
kscan_callback_t callback;
|
|
/** Work queue (for deferred read). */
|
|
struct k_work work;
|
|
|
|
#ifdef CONFIG_KSCAN_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;
|
|
struct cst816s_data *data = dev->data;
|
|
|
|
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 (data->callback) {
|
|
data->callback(dev, row, col, pressed);
|
|
}
|
|
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_KSCAN_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 int cst816s_configure(const struct device *dev,
|
|
kscan_callback_t callback)
|
|
{
|
|
struct cst816s_data *data = dev->data;
|
|
|
|
if (!callback) {
|
|
LOG_ERR("Invalid callback (NULL)");
|
|
return -EINVAL;
|
|
}
|
|
|
|
data->callback = callback;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cst816s_enable_callback(const struct device *dev)
|
|
{
|
|
struct cst816s_data *data = dev->data;
|
|
|
|
#ifdef CONFIG_KSCAN_CST816S_INTERRUPT
|
|
const struct cst816s_config *config = dev->config;
|
|
|
|
gpio_add_callback(config->int_gpio.port, &data->int_gpio_cb);
|
|
#else
|
|
k_timer_start(&data->timer, K_MSEC(CONFIG_KSCAN_CST816S_PERIOD),
|
|
K_MSEC(CONFIG_KSCAN_CST816S_PERIOD));
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cst816s_disable_callback(const struct device *dev)
|
|
{
|
|
struct cst816s_data *data = dev->data;
|
|
|
|
#ifdef CONFIG_KSCAN_CST816S_INTERRUPT
|
|
const struct cst816s_config *config = dev->config;
|
|
|
|
gpio_remove_callback(config->int_gpio.port, &data->int_gpio_cb);
|
|
#else
|
|
k_timer_stop(&data->timer);
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void cst816s_chip_reset(const struct device *dev)
|
|
{
|
|
const struct cst816s_config *config = dev->config;
|
|
int ret;
|
|
|
|
if (device_is_ready(config->rst_gpio.port)) {
|
|
ret = gpio_pin_configure_dt(&config->rst_gpio,
|
|
GPIO_OUTPUT_INACTIVE);
|
|
if (ret < 0) {
|
|
LOG_ERR("Could not configure reset GPIO pin");
|
|
return;
|
|
}
|
|
gpio_pin_set_dt(&config->rst_gpio, 1);
|
|
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_ID) {
|
|
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_KSCAN_CST816S_INTERRUPT
|
|
const struct cst816s_config *config = dev->config;
|
|
int ret;
|
|
|
|
if (!device_is_ready(config->int_gpio.port)) {
|
|
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));
|
|
#else
|
|
k_timer_init(&data->timer, cst816s_timer_handler, NULL);
|
|
#endif
|
|
|
|
return cst816s_chip_init(dev);
|
|
}
|
|
|
|
static const struct kscan_driver_api cst816s_driver_api = {
|
|
.config = cst816s_configure,
|
|
.enable_callback = cst816s_enable_callback,
|
|
.disable_callback = cst816s_disable_callback,
|
|
};
|
|
|
|
#define CST816S_DEFINE(index) \
|
|
static const struct cst816s_config cst816s_config_##index = { \
|
|
.i2c = I2C_DT_SPEC_INST_GET(index), \
|
|
COND_CODE_1(CONFIG_KSCAN_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_KSCAN_INIT_PRIORITY, \
|
|
&cst816s_driver_api);
|
|
|
|
DT_INST_FOREACH_STATUS_OKAY(CST816S_DEFINE)
|