70 struct dht11 {  struct
94 static void dht11_edges_print(struct dht11 *dht11)  in dht11_edges_print()  argument
98 	dev_dbg(dht11->dev, "%d edges detected:\n", dht11->num_edges);  in dht11_edges_print()
99 	for (i = 1; i < dht11->num_edges; ++i) {  in dht11_edges_print()
100 		dev_dbg(dht11->dev, "%d: %lld ns %s\n", i,  in dht11_edges_print()
101 			dht11->edges[i].ts - dht11->edges[i - 1].ts,  in dht11_edges_print()
102 			dht11->edges[i - 1].value ? "high" : "low");  in dht11_edges_print()
121 static int dht11_decode(struct dht11 *dht11, int offset)  in dht11_decode()  argument
128 		t = dht11->edges[offset + 2 * i + 2].ts -  in dht11_decode()
129 			dht11->edges[offset + 2 * i + 1].ts;  in dht11_decode()
130 		if (!dht11->edges[offset + 2 * i + 1].value) {  in dht11_decode()
131 			dev_dbg(dht11->dev,  in dht11_decode()
146 		dev_dbg(dht11->dev, "invalid checksum\n");  in dht11_decode()
150 	dht11->timestamp = ktime_get_boottime_ns();  in dht11_decode()
152 		dht11->temperature = (((temp_int & 0x7f) << 8) + temp_dec) *  in dht11_decode()
154 		dht11->humidity = ((hum_int << 8) + hum_dec) * 100;  in dht11_decode()
156 		dht11->temperature = temp_int * 1000;  in dht11_decode()
157 		dht11->humidity = hum_int * 1000;  in dht11_decode()
159 		dev_err(dht11->dev,  in dht11_decode()
174 	struct dht11 *dht11 = iio_priv(iio);  in dht11_handle_irq()  local
176 	if (dht11->num_edges < DHT11_EDGES_PER_READ && dht11->num_edges >= 0) {  in dht11_handle_irq()
177 		dht11->edges[dht11->num_edges].ts = ktime_get_boottime_ns();  in dht11_handle_irq()
178 		dht11->edges[dht11->num_edges++].value =  in dht11_handle_irq()
179 						gpiod_get_value(dht11->gpiod);  in dht11_handle_irq()
181 		if (dht11->num_edges >= DHT11_EDGES_PER_READ)  in dht11_handle_irq()
182 			complete(&dht11->completion);  in dht11_handle_irq()
192 	struct dht11 *dht11 = iio_priv(iio_dev);  in dht11_read_raw()  local
195 	mutex_lock(&dht11->lock);  in dht11_read_raw()
196 	if (dht11->timestamp + DHT11_DATA_VALID_TIME < ktime_get_boottime_ns()) {  in dht11_read_raw()
198 		dev_dbg(dht11->dev, "current timeresolution: %dns\n", timeres);  in dht11_read_raw()
200 			dev_err(dht11->dev, "timeresolution %dns too low\n",  in dht11_read_raw()
210 			dev_warn(dht11->dev,  in dht11_read_raw()
214 		reinit_completion(&dht11->completion);  in dht11_read_raw()
216 		dht11->num_edges = 0;  in dht11_read_raw()
217 		ret = gpiod_direction_output(dht11->gpiod, 0);  in dht11_read_raw()
222 		ret = gpiod_direction_input(dht11->gpiod);  in dht11_read_raw()
226 		ret = request_irq(dht11->irq, dht11_handle_irq,  in dht11_read_raw()
232 		ret = wait_for_completion_killable_timeout(&dht11->completion,  in dht11_read_raw()
235 		free_irq(dht11->irq, iio_dev);  in dht11_read_raw()
238 		dht11_edges_print(dht11);  in dht11_read_raw()
241 		if (ret == 0 && dht11->num_edges < DHT11_EDGES_PER_READ - 1) {  in dht11_read_raw()
242 			dev_err(dht11->dev, "Only %d signal edges detected\n",  in dht11_read_raw()
243 				dht11->num_edges);  in dht11_read_raw()
250 				dht11->num_edges - DHT11_EDGES_PER_READ;  in dht11_read_raw()
252 			ret = dht11_decode(dht11, offset);  in dht11_read_raw()
263 		*val = dht11->temperature;  in dht11_read_raw()
265 		*val = dht11->humidity;  in dht11_read_raw()
269 	dht11->num_edges = -1;  in dht11_read_raw()
270 	mutex_unlock(&dht11->lock);  in dht11_read_raw()
294 	struct dht11 *dht11;  in dht11_probe()  local
297 	iio = devm_iio_device_alloc(dev, sizeof(*dht11));  in dht11_probe()
303 	dht11 = iio_priv(iio);  in dht11_probe()
304 	dht11->dev = dev;  in dht11_probe()
305 	dht11->gpiod = devm_gpiod_get(dev, NULL, GPIOD_IN);  in dht11_probe()
306 	if (IS_ERR(dht11->gpiod))  in dht11_probe()
307 		return PTR_ERR(dht11->gpiod);  in dht11_probe()
309 	dht11->irq = gpiod_to_irq(dht11->gpiod);  in dht11_probe()
310 	if (dht11->irq < 0) {  in dht11_probe()
311 		dev_err(dev, "GPIO %d has no interrupt\n", desc_to_gpio(dht11->gpiod));  in dht11_probe()
315 	dht11->timestamp = ktime_get_boottime_ns() - DHT11_DATA_VALID_TIME - 1;  in dht11_probe()
316 	dht11->num_edges = -1;  in dht11_probe()
320 	init_completion(&dht11->completion);  in dht11_probe()
321 	mutex_init(&dht11->lock);  in dht11_probe()