79 struct hx711_data {  struct
101 static int hx711_cycle(struct hx711_data *hx711_data)  in hx711_cycle()  argument
111 	gpiod_set_value(hx711_data->gpiod_pd_sck, 1);  in hx711_cycle()
118 	ndelay(hx711_data->data_ready_delay_ns);  in hx711_cycle()
126 	gpiod_set_value(hx711_data->gpiod_pd_sck, 0);  in hx711_cycle()
133 	ndelay(hx711_data->data_ready_delay_ns);  in hx711_cycle()
136 	return gpiod_get_value(hx711_data->gpiod_dout);  in hx711_cycle()
139 static int hx711_read(struct hx711_data *hx711_data)  in hx711_read()  argument
143 	int val = gpiod_get_value(hx711_data->gpiod_dout);  in hx711_read()
151 		ret = hx711_cycle(hx711_data);  in hx711_read()
158 	for (i = 0; i < hx711_get_gain_to_pulse(hx711_data->gain_set); i++)  in hx711_read()
159 		hx711_cycle(hx711_data);  in hx711_read()
164 static int hx711_wait_for_ready(struct hx711_data *hx711_data)  in hx711_wait_for_ready()  argument
174 		val = gpiod_get_value(hx711_data->gpiod_dout);  in hx711_wait_for_ready()
186 static int hx711_reset(struct hx711_data *hx711_data)  in hx711_reset()  argument
188 	int val = hx711_wait_for_ready(hx711_data);  in hx711_reset()
200 		gpiod_set_value(hx711_data->gpiod_pd_sck, 1);  in hx711_reset()
202 		gpiod_set_value(hx711_data->gpiod_pd_sck, 0);  in hx711_reset()
204 		val = hx711_wait_for_ready(hx711_data);  in hx711_reset()
207 		hx711_data->gain_set = HX711_RESET_GAIN;  in hx711_reset()
213 static int hx711_set_gain_for_channel(struct hx711_data *hx711_data, int chan)  in hx711_set_gain_for_channel()  argument
218 		if (hx711_data->gain_set == 32) {  in hx711_set_gain_for_channel()
219 			hx711_data->gain_set = hx711_data->gain_chan_a;  in hx711_set_gain_for_channel()
221 			ret = hx711_read(hx711_data);  in hx711_set_gain_for_channel()
225 			ret = hx711_wait_for_ready(hx711_data);  in hx711_set_gain_for_channel()
230 		if (hx711_data->gain_set != 32) {  in hx711_set_gain_for_channel()
231 			hx711_data->gain_set = 32;  in hx711_set_gain_for_channel()
233 			ret = hx711_read(hx711_data);  in hx711_set_gain_for_channel()
237 			ret = hx711_wait_for_ready(hx711_data);  in hx711_set_gain_for_channel()
246 static int hx711_reset_read(struct hx711_data *hx711_data, int chan)  in hx711_reset_read()  argument
255 	if (hx711_reset(hx711_data)) {  in hx711_reset_read()
256 		dev_err(hx711_data->dev, "reset failed!");  in hx711_reset_read()
260 	ret = hx711_set_gain_for_channel(hx711_data, chan);  in hx711_reset_read()
264 	val = hx711_read(hx711_data);  in hx711_reset_read()
273 	struct hx711_data *hx711_data = iio_priv(indio_dev);  in hx711_read_raw()  local
277 		mutex_lock(&hx711_data->lock);  in hx711_read_raw()
279 		*val = hx711_reset_read(hx711_data, chan->channel);  in hx711_read_raw()
281 		mutex_unlock(&hx711_data->lock);  in hx711_read_raw()
288 		mutex_lock(&hx711_data->lock);  in hx711_read_raw()
290 		*val2 = hx711_get_gain_to_scale(hx711_data->gain_set);  in hx711_read_raw()
292 		mutex_unlock(&hx711_data->lock);  in hx711_read_raw()
306 	struct hx711_data *hx711_data = iio_priv(indio_dev);  in hx711_write_raw()  local
319 		mutex_lock(&hx711_data->lock);  in hx711_write_raw()
323 			mutex_unlock(&hx711_data->lock);  in hx711_write_raw()
327 		if (gain != hx711_data->gain_set) {  in hx711_write_raw()
328 			hx711_data->gain_set = gain;  in hx711_write_raw()
330 				hx711_data->gain_chan_a = gain;  in hx711_write_raw()
332 			ret = hx711_read(hx711_data);  in hx711_write_raw()
334 				mutex_unlock(&hx711_data->lock);  in hx711_write_raw()
339 		mutex_unlock(&hx711_data->lock);  in hx711_write_raw()
359 	struct hx711_data *hx711_data = iio_priv(indio_dev);  in hx711_trigger()  local
362 	mutex_lock(&hx711_data->lock);  in hx711_trigger()
364 	memset(hx711_data->buffer, 0, sizeof(hx711_data->buffer));  in hx711_trigger()
367 		hx711_data->buffer[j] = hx711_reset_read(hx711_data,  in hx711_trigger()
372 	iio_push_to_buffers_with_timestamp(indio_dev, hx711_data->buffer,  in hx711_trigger()
375 	mutex_unlock(&hx711_data->lock);  in hx711_trigger()
458 	struct hx711_data *hx711_data;  in hx711_probe()  local
463 	indio_dev = devm_iio_device_alloc(dev, sizeof(struct hx711_data));  in hx711_probe()
467 	hx711_data = iio_priv(indio_dev);  in hx711_probe()
468 	hx711_data->dev = dev;  in hx711_probe()
470 	mutex_init(&hx711_data->lock);  in hx711_probe()
476 	hx711_data->gpiod_pd_sck = devm_gpiod_get(dev, "sck", GPIOD_OUT_LOW);  in hx711_probe()
477 	if (IS_ERR(hx711_data->gpiod_pd_sck))  in hx711_probe()
478 		return dev_err_probe(dev, PTR_ERR(hx711_data->gpiod_pd_sck),  in hx711_probe()
485 	hx711_data->gpiod_dout = devm_gpiod_get(dev, "dout", GPIOD_IN);  in hx711_probe()
486 	if (IS_ERR(hx711_data->gpiod_dout))  in hx711_probe()
487 		return dev_err_probe(dev, PTR_ERR(hx711_data->gpiod_dout),  in hx711_probe()
514 	hx711_data->gain_set = 128;  in hx711_probe()
515 	hx711_data->gain_chan_a = 128;  in hx711_probe()
517 	hx711_data->clock_frequency = 400000;  in hx711_probe()
519 					&hx711_data->clock_frequency);  in hx711_probe()
525 	if (hx711_data->clock_frequency < 20000) {  in hx711_probe()
527 		hx711_data->clock_frequency = 400000;  in hx711_probe()
530 	hx711_data->data_ready_delay_ns =  in hx711_probe()
531 				1000000000 / hx711_data->clock_frequency;  in hx711_probe()