2  * Marvell Berlin2 ADC driver
6  * Antoine Tenart <antoine.tenart@free-electrons.com>
31 #define  BERLIN2_SM_CTRL_ADC_SEL(x)		((x) << 5)	/* 0-15 */
51 #define  BERLIN2_SM_CTRL_TSEN_MODE_0_125	(0x0 << 22)	/* 0-125 C */
52 #define  BERLIN2_SM_CTRL_TSEN_MODE_10_50	(0x1 << 22)	/* 10-50 C */
57 #define  BERLIN2_SM_ADC_STATUS_DATA_RDY(x)	BIT(x)		/* 0-15 */
59 #define  BERLIN2_SM_ADC_STATUS_INT_EN(x)	(BIT(x) << 16)	/* 0-15 */
96 	BERLIN2_ADC_CHANNEL(4, IIO_VOLTAGE),	/* reserved */
97 	BERLIN2_ADC_CHANNEL(5, IIO_VOLTAGE),	/* reserved */
105 	BERLIN2_ADC_CHANNEL(7, IIO_VOLTAGE),	/* reserved */
114 	mutex_lock(&priv->lock);  in berlin2_adc_read()
117 	regmap_write(priv->regmap, BERLIN2_SM_ADC_STATUS,  in berlin2_adc_read()
120 	/* Configure the ADC */  in berlin2_adc_read()
121 	regmap_update_bits(priv->regmap, BERLIN2_SM_CTRL,  in berlin2_adc_read()
128 	ret = wait_event_interruptible_timeout(priv->wq, priv->data_available,  in berlin2_adc_read()
132 	regmap_clear_bits(priv->regmap, BERLIN2_SM_ADC_STATUS,  in berlin2_adc_read()
136 		ret = -ETIMEDOUT;  in berlin2_adc_read()
138 		mutex_unlock(&priv->lock);  in berlin2_adc_read()
142 	regmap_clear_bits(priv->regmap, BERLIN2_SM_CTRL,  in berlin2_adc_read()
145 	data = priv->data;  in berlin2_adc_read()
146 	priv->data_available = false;  in berlin2_adc_read()
148 	mutex_unlock(&priv->lock);  in berlin2_adc_read()
158 	mutex_lock(&priv->lock);  in berlin2_adc_tsen_read()
161 	regmap_write(priv->regmap, BERLIN2_SM_TSEN_STATUS,  in berlin2_adc_tsen_read()
164 	/* Configure the ADC */  in berlin2_adc_tsen_read()
165 	regmap_update_bits(priv->regmap, BERLIN2_SM_CTRL,  in berlin2_adc_tsen_read()
171 	regmap_update_bits(priv->regmap, BERLIN2_SM_TSEN_CTRL,  in berlin2_adc_tsen_read()
179 	ret = wait_event_interruptible_timeout(priv->wq, priv->data_available,  in berlin2_adc_tsen_read()
183 	regmap_clear_bits(priv->regmap, BERLIN2_SM_TSEN_STATUS,  in berlin2_adc_tsen_read()
187 		ret = -ETIMEDOUT;  in berlin2_adc_tsen_read()
189 		mutex_unlock(&priv->lock);  in berlin2_adc_tsen_read()
193 	regmap_clear_bits(priv->regmap, BERLIN2_SM_TSEN_CTRL,  in berlin2_adc_tsen_read()
196 	data = priv->data;  in berlin2_adc_tsen_read()
197 	priv->data_available = false;  in berlin2_adc_tsen_read()
199 	mutex_unlock(&priv->lock);  in berlin2_adc_tsen_read()
212 		if (chan->type != IIO_VOLTAGE)  in berlin2_adc_read_raw()
213 			return -EINVAL;  in berlin2_adc_read_raw()
215 		*val = berlin2_adc_read(indio_dev, chan->channel);  in berlin2_adc_read_raw()
221 		if (chan->type != IIO_TEMP)  in berlin2_adc_read_raw()
222 			return -EINVAL;  in berlin2_adc_read_raw()
229 			temp -= 4096;  in berlin2_adc_read_raw()
232 		*val = ((temp * 100000) / 264 - 270000);  in berlin2_adc_read_raw()
238 	return -EINVAL;  in berlin2_adc_read_raw()
246 	regmap_read(priv->regmap, BERLIN2_SM_ADC_STATUS, &val);  in berlin2_adc_irq()
248 		regmap_read(priv->regmap, BERLIN2_SM_ADC_DATA, &priv->data);  in berlin2_adc_irq()
249 		priv->data &= BERLIN2_SM_ADC_MASK;  in berlin2_adc_irq()
252 		regmap_write(priv->regmap, BERLIN2_SM_ADC_STATUS, val);  in berlin2_adc_irq()
254 		priv->data_available = true;  in berlin2_adc_irq()
255 		wake_up_interruptible(&priv->wq);  in berlin2_adc_irq()
266 	regmap_read(priv->regmap, BERLIN2_SM_TSEN_STATUS, &val);  in berlin2_adc_tsen_irq()
268 		regmap_read(priv->regmap, BERLIN2_SM_TSEN_DATA, &priv->data);  in berlin2_adc_tsen_irq()
269 		priv->data &= BERLIN2_SM_TSEN_MASK;  in berlin2_adc_tsen_irq()
272 		regmap_write(priv->regmap, BERLIN2_SM_TSEN_STATUS, val);  in berlin2_adc_tsen_irq()
274 		priv->data_available = true;  in berlin2_adc_tsen_irq()
275 		wake_up_interruptible(&priv->wq);  in berlin2_adc_tsen_irq()
295 	struct device_node *parent_np = of_get_parent(pdev->dev.of_node);  in berlin2_adc_probe()
299 	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*priv));  in berlin2_adc_probe()
302 		return -ENOMEM;  in berlin2_adc_probe()
307 	priv->regmap = syscon_node_to_regmap(parent_np);  in berlin2_adc_probe()
309 	if (IS_ERR(priv->regmap))  in berlin2_adc_probe()
310 		return PTR_ERR(priv->regmap);  in berlin2_adc_probe()
312 	irq = platform_get_irq_byname(pdev, "adc");  in berlin2_adc_probe()
320 	ret = devm_request_irq(&pdev->dev, irq, berlin2_adc_irq, 0,  in berlin2_adc_probe()
321 			       pdev->dev.driver->name, indio_dev);  in berlin2_adc_probe()
325 	ret = devm_request_irq(&pdev->dev, tsen_irq, berlin2_adc_tsen_irq,  in berlin2_adc_probe()
326 			       0, pdev->dev.driver->name, indio_dev);  in berlin2_adc_probe()
330 	init_waitqueue_head(&priv->wq);  in berlin2_adc_probe()
331 	mutex_init(&priv->lock);  in berlin2_adc_probe()
333 	indio_dev->name = dev_name(&pdev->dev);  in berlin2_adc_probe()
334 	indio_dev->modes = INDIO_DIRECT_MODE;  in berlin2_adc_probe()
335 	indio_dev->info = &berlin2_adc_info;  in berlin2_adc_probe()
337 	indio_dev->channels = berlin2_adc_channels;  in berlin2_adc_probe()
338 	indio_dev->num_channels = ARRAY_SIZE(berlin2_adc_channels);  in berlin2_adc_probe()
340 	/* Power up the ADC */  in berlin2_adc_probe()
341 	regmap_set_bits(priv->regmap, BERLIN2_SM_CTRL,  in berlin2_adc_probe()
344 	ret = devm_add_action_or_reset(&pdev->dev, berlin2_adc_powerdown,  in berlin2_adc_probe()
345 				       priv->regmap);  in berlin2_adc_probe()
349 	return devm_iio_device_register(&pdev->dev, indio_dev);  in berlin2_adc_probe()
353 	{ .compatible = "marvell,berlin2-adc", },
360 		.name		= "berlin2-adc",
367 MODULE_AUTHOR("Antoine Tenart <antoine.tenart@free-electrons.com>");
368 MODULE_DESCRIPTION("Marvell Berlin2 ADC driver");