iio/adc/sun20i-gpadc-iio.c

1 // SPDX-License-Identifier: GPL-2.0
3  * GPADC driver for sunxi platforms (D1, T113-S3 and R329)
20 #define SUN20I_GPADC_DRIVER_NAME	"sun20i-gpadc"
68 	mutex_lock(&info->lock);  in sun20i_gpadc_adc_read()
70 	reinit_completion(&info->completion);  in sun20i_gpadc_adc_read()
72 	if (info->last_channel != chan->channel) {  in sun20i_gpadc_adc_read()
73 		info->last_channel = chan->channel;  in sun20i_gpadc_adc_read()
76 		writel(SUN20I_GPADC_CS_EN_ADC_CH(chan->channel),  in sun20i_gpadc_adc_read()
77 		       info->regs + SUN20I_GPADC_CS_EN);  in sun20i_gpadc_adc_read()
80 		writel(SUN20I_GPADC_DATA_INTC_CH_DATA_IRQ_EN(chan->channel),  in sun20i_gpadc_adc_read()
81 		       info->regs + SUN20I_GPADC_DATA_INTC);  in sun20i_gpadc_adc_read()
85 	ctrl = readl(info->regs + SUN20I_GPADC_CTRL);  in sun20i_gpadc_adc_read()
87 	writel(ctrl, info->regs + SUN20I_GPADC_CTRL);  in sun20i_gpadc_adc_read()
96 	if (!wait_for_completion_timeout(&info->completion, msecs_to_jiffies(10))) {  in sun20i_gpadc_adc_read()
97 		ret = -ETIMEDOUT;  in sun20i_gpadc_adc_read()
102 	*val = readl(info->regs + SUN20I_GPADC_CH_DATA(chan->channel));  in sun20i_gpadc_adc_read()
105 	mutex_unlock(&info->lock);  in sun20i_gpadc_adc_read()
125 		return -EINVAL;  in sun20i_gpadc_read_raw()
134 	writel(GENMASK(31, 0), info->regs + SUN20I_GPADC_DATA_INTS);  in sun20i_gpadc_irq_handler()
136 	complete(&info->completion);  in sun20i_gpadc_irq_handler()
162 		return dev_err_probe(dev, -ENODEV, "no channel children\n");  in sun20i_gpadc_alloc_channels()
167 		return -ENOMEM;  in sun20i_gpadc_alloc_channels()
186 	indio_dev->channels = channels;  in sun20i_gpadc_alloc_channels()
187 	indio_dev->num_channels = num_channels;  in sun20i_gpadc_alloc_channels()
194 	struct device *dev = &pdev->dev;  in sun20i_gpadc_probe()
204 		return -ENOMEM;  in sun20i_gpadc_probe()
207 	info->last_channel = -1;  in sun20i_gpadc_probe()
209 	mutex_init(&info->lock);  in sun20i_gpadc_probe()
210 	init_completion(&info->completion);  in sun20i_gpadc_probe()
216 	indio_dev->info = &sun20i_gpadc_iio_info;  in sun20i_gpadc_probe()
217 	indio_dev->name = SUN20I_GPADC_DRIVER_NAME;  in sun20i_gpadc_probe()
219 	info->regs = devm_platform_ioremap_resource(pdev, 0);  in sun20i_gpadc_probe()
220 	if (IS_ERR(info->regs))  in sun20i_gpadc_probe()
221 		return PTR_ERR(info->regs);  in sun20i_gpadc_probe()
250 	       info->regs + SUN20I_GPADC_CTRL);  in sun20i_gpadc_probe()
260 	{ .compatible = "allwinner,sun20i-d1-gpadc" },