/* * Copyright (c) 2021 Qingsong Gou * * SPDX-License-Identifier: Apache-2.0 */ #define DT_DRV_COMPAT hynitron_cst816s #include #include #include #include #include LOG_MODULE_REGISTER(cst816s, CONFIG_INPUT_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_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_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_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)