1 // SPDX-License-Identifier: GPL-2.0
5  * Author: Ziyuan Xu <xzy.xu@rock-chips.com>
17  * id:			the index of analog switch inputs
19  * gpio_mask:		set the value of switch-gpios with mask, that
20  *			makes the 'id' connect to 'saradc_chan_id'.
23 	u32 id;  member
29 	.id = _index,					\
46  * gpios:		pointer of digital enable input gpios
54 	struct gpio_descs *gpios;  member
68 	chan_data = &muxadc->data->chans[index];  in gpio_muxadc_chan_read_by_index()
69 	for (i = 0; i < muxadc->gpios->ndescs; i++) {  in gpio_muxadc_chan_read_by_index()
70 		struct gpio_desc *gpiod = muxadc->gpios->desc[i];  in gpio_muxadc_chan_read_by_index()
71 		int gpio_val = chan_data->gpio_mask & BIT(i) ? 1 : 0;  in gpio_muxadc_chan_read_by_index()
76 	saradc_chan_id = chan_data->saradc_chan_id;  in gpio_muxadc_chan_read_by_index()
77 	saradc_chan = &muxadc->adc_chans[saradc_chan_id];  in gpio_muxadc_chan_read_by_index()
91 						     chan->channel, val);  in gpio_muxadc_read_raw()
94 		return -EINVAL;  in gpio_muxadc_read_raw()
156 	struct device *dev = &pdev->dev;  in gpio_muxadc_probe()
157 	struct device_node *np = pdev->dev.of_node;  in gpio_muxadc_probe()
162 		return -ENOMEM;  in gpio_muxadc_probe()
169 		return -ENODEV;  in gpio_muxadc_probe()
171 	muxadc->data = match->data;  in gpio_muxadc_probe()
173 	muxadc->gpios = devm_gpiod_get_array(dev, "switch", GPIOD_OUT_LOW);  in gpio_muxadc_probe()
174 	if (IS_ERR(muxadc->gpios)) {  in gpio_muxadc_probe()
175 		dev_err(dev, "property of switch-gpios not specified\n");  in gpio_muxadc_probe()
176 		return PTR_ERR(muxadc->gpios);  in gpio_muxadc_probe()
179 	muxadc->adc_chans = iio_channel_get_all(dev);  in gpio_muxadc_probe()
180 	if (IS_ERR(muxadc->adc_chans))  in gpio_muxadc_probe()
181 		return PTR_ERR(muxadc->adc_chans);  in gpio_muxadc_probe()
184 	 * comparison with chan_data->saradc_nr_chans. Otherwise it  in gpio_muxadc_probe()
187 	while (muxadc->adc_chans[nr_adc_chans].indio_dev)  in gpio_muxadc_probe()
189 	if (muxadc->data->saradc_nr_chans != nr_adc_chans) {  in gpio_muxadc_probe()
190 		dev_err(dev, "the number of io-channels is mismatch\n");  in gpio_muxadc_probe()
191 		return -EINVAL;  in gpio_muxadc_probe()
194 	muxadc->nr_chans = of_property_count_strings(np, "labels");  in gpio_muxadc_probe()
195 	if (muxadc->nr_chans != muxadc->data->nr_chans) {  in gpio_muxadc_probe()
197 			muxadc->nr_chans);  in gpio_muxadc_probe()
198 		return -EINVAL;  in gpio_muxadc_probe()
201 	muxadc->muxchans = devm_kcalloc(dev, muxadc->nr_chans,  in gpio_muxadc_probe()
204 	if (!muxadc->muxchans)  in gpio_muxadc_probe()
205 		return -ENOMEM;  in gpio_muxadc_probe()
207 	for (i = 0; i < muxadc->nr_chans; i++) {  in gpio_muxadc_probe()
212 		muxadc->muxchans[i].type = IIO_VOLTAGE;  in gpio_muxadc_probe()
213 		muxadc->muxchans[i].channel = i;  in gpio_muxadc_probe()
214 		muxadc->muxchans[i].info_mask_separate = BIT(IIO_CHAN_INFO_RAW);  in gpio_muxadc_probe()
216 					      &muxadc->muxchans[i].extend_name);  in gpio_muxadc_probe()
219 	indio_dev->name = dev_name(dev);  in gpio_muxadc_probe()
220 	indio_dev->dev.parent = dev;  in gpio_muxadc_probe()
221 	indio_dev->dev.of_node = dev->of_node;  in gpio_muxadc_probe()
222 	indio_dev->info = &gpio_muxadc_iio_info;  in gpio_muxadc_probe()
223 	indio_dev->modes = INDIO_DIRECT_MODE;  in gpio_muxadc_probe()
224 	indio_dev->channels = muxadc->muxchans;  in gpio_muxadc_probe()
225 	indio_dev->num_channels = muxadc->nr_chans;  in gpio_muxadc_probe()
242 		.name	= "gpio-muxadc",
249 MODULE_AUTHOR("Ziyuan Xu <xzy.xu@rock-chips.com>");