4  * SPDX-License-Identifier: Apache-2.0
56 #define START		      BIT(7)  macro
64 /* Read all Z1, X, Y, Z2 channels using 16 Clocks-per-Conversion mode.
65  * See the manual https://www.waveshare.com/w/upload/9/98/XPT2046-EN.pdf for details.
66  * Each follow-up command interleaves with previous conversion.
70 	[0] = START | CHANNEL(CH_Z1) | POWER_ON,
71 	[2] = START | CHANNEL(CH_Z2) | POWER_ON,
72 	[4] = START | CHANNEL(CH_X) | POWER_ON,
73 	[6] = START | CHANNEL(CH_Y) | POWER_OFF,
78 	struct xpt2046_data *data = CONTAINER_OF(cb, struct xpt2046_data, int_gpio_cb);  in xpt2046_isr_handler()  local
79 	const struct xpt2046_config *config = data->dev->config;  in xpt2046_isr_handler()
81 	gpio_remove_callback(config->int_gpio.port, &data->int_gpio_cb);  in xpt2046_isr_handler()
82 	k_work_submit(&data->work);  in xpt2046_isr_handler()
95 	uint8_t *buf = rx->buffers->buf;  in xpt2046_read_and_cumulate()
97 	meas->z += CONVERT_U16(buf, 1) + 4096 - CONVERT_U16(buf, 3);  in xpt2046_read_and_cumulate()
98 	meas->x += CONVERT_U16(buf, 5);  in xpt2046_read_and_cumulate()
99 	meas->y += CONVERT_U16(buf, 7);  in xpt2046_read_and_cumulate()
107 	struct xpt2046_data *data = CONTAINER_OF(dw, struct xpt2046_data, dwork);  in xpt2046_release_handler()  local
108 	struct xpt2046_config *config = (struct xpt2046_config *)data->dev->config;  in xpt2046_release_handler()
110 	if (!data->pressed) {  in xpt2046_release_handler()
115 	if (gpio_pin_get_dt(&config->int_gpio) == 0) {  in xpt2046_release_handler()
116 		data->pressed = false;  in xpt2046_release_handler()
117 		input_report_key(data->dev, INPUT_BTN_TOUCH, 0, true, K_FOREVER);  in xpt2046_release_handler()
119 		/* Re-check later */  in xpt2046_release_handler()
120 		k_work_reschedule(&data->dwork, K_MSEC(10));  in xpt2046_release_handler()
126 	struct xpt2046_data *data = CONTAINER_OF(kw, struct xpt2046_data, work);  in xpt2046_work_handler()  local
127 	struct xpt2046_config *config = (struct xpt2046_config *)data->dev->config;  in xpt2046_work_handler()
131 	const struct spi_buf rxb = {.buf = data->rbuf, .len = sizeof(data->rbuf)};  in xpt2046_work_handler()
136 	int rounds = config->reads;  in xpt2046_work_handler()
140 		if (xpt2046_read_and_cumulate(&config->bus, &tx_bufs, &rx_bufs, &meas) != 0) {  in xpt2046_work_handler()
150 	 * Use signed int32_t for calculation to ensure that we cover the roll-over to negative  in xpt2046_work_handler()
153 	int32_t mx = (config->screen_size_x << 16) / (config->max_x - config->min_x);  in xpt2046_work_handler()
154 	int32_t cx = (config->screen_size_x << 16) - mx * config->max_x;  in xpt2046_work_handler()
159 	int32_t my = (config->screen_size_y << 16) / (config->max_y - config->min_y);  in xpt2046_work_handler()
160 	int32_t cy = (config->screen_size_y << 16) - my * config->max_y;  in xpt2046_work_handler()
165 	bool pressed = meas.z > config->threshold;  in xpt2046_work_handler()
173 		input_report_abs(data->dev, INPUT_ABS_X, x, false, K_FOREVER);  in xpt2046_work_handler()
174 		input_report_abs(data->dev, INPUT_ABS_Y, y, false, K_FOREVER);  in xpt2046_work_handler()
175 		input_report_key(data->dev, INPUT_BTN_TOUCH, 1, true, K_FOREVER);  in xpt2046_work_handler()
177 		data->last_x = x;  in xpt2046_work_handler()
178 		data->last_y = y;  in xpt2046_work_handler()
179 		data->pressed = pressed;  in xpt2046_work_handler()
182 		k_work_reschedule(&data->dwork, K_MSEC(100));  in xpt2046_work_handler()
185 	ret = gpio_add_callback(config->int_gpio.port, &data->int_gpio_cb);  in xpt2046_work_handler()
195 	const struct xpt2046_config *config = dev->config;  in xpt2046_init()
196 	struct xpt2046_data *data = dev->data;  in xpt2046_init()  local
198 	if (!spi_is_ready_dt(&config->bus)) {  in xpt2046_init()
200 		return -ENODEV;  in xpt2046_init()
203 	data->dev = dev;  in xpt2046_init()
204 	k_work_init(&data->work, xpt2046_work_handler);  in xpt2046_init()
205 	k_work_init_delayable(&data->dwork, xpt2046_release_handler);  in xpt2046_init()
207 	if (!gpio_is_ready_dt(&config->int_gpio)) {  in xpt2046_init()
209 		return -ENODEV;  in xpt2046_init()
212 	r = gpio_pin_configure_dt(&config->int_gpio, GPIO_INPUT);  in xpt2046_init()
214 		LOG_ERR("Could not configure interrupt GPIO pin");  in xpt2046_init()
218 	r = gpio_pin_interrupt_configure_dt(&config->int_gpio, GPIO_INT_EDGE_TO_ACTIVE);  in xpt2046_init()
224 	gpio_init_callback(&data->int_gpio_cb, xpt2046_isr_handler, BIT(config->int_gpio.pin));  in xpt2046_init()
226 	r = gpio_add_callback(config->int_gpio.port, &data->int_gpio_cb);  in xpt2046_init()
232 	LOG_INF("Init '%s' device", dev->name);  in xpt2046_init()