1 // SPDX-License-Identifier: GPL-2.0-only
3  * Copyright (C) 2014-2015 Pengutronix, Markus Pargmann <mpa@pengutronix.de>
5  * This is the driver for the imx25 GCQ (Generic Conversion Queue)
6  * connected to the imx25 ADC.
9 #include <dt-bindings/iio/adc/fsl-imx25-gcq.h>
13 #include <linux/mfd/imx25-tsadc.h>
22 static const char * const driver_name = "mx25-gcq";
86 	regmap_read(priv->regs, MX25_ADCQ_SR, &stats);  in mx25_gcq_irq()
89 		regmap_update_bits(priv->regs, MX25_ADCQ_MR,  in mx25_gcq_irq()
91 		complete(&priv->completed);  in mx25_gcq_irq()
95 	regmap_update_bits(priv->regs, MX25_ADCQ_CR, MX25_ADCQ_CR_FQS, 0);  in mx25_gcq_irq()
98 	regmap_write(priv->regs, MX25_ADCQ_SR, MX25_ADCQ_SR_FRR |  in mx25_gcq_irq()
114 	regmap_write(priv->regs, MX25_ADCQ_ITEM_7_0,  in mx25_gcq_get_raw_value()
115 		     MX25_ADCQ_ITEM(0, chan->channel));  in mx25_gcq_get_raw_value()
117 	regmap_update_bits(priv->regs, MX25_ADCQ_MR, MX25_ADCQ_MR_EOQ_IRQ, 0);  in mx25_gcq_get_raw_value()
120 	regmap_update_bits(priv->regs, MX25_ADCQ_CR, MX25_ADCQ_CR_FQS,  in mx25_gcq_get_raw_value()
124 		&priv->completed, MX25_GCQ_TIMEOUT);  in mx25_gcq_get_raw_value()
130 		return -ETIMEDOUT;  in mx25_gcq_get_raw_value()
133 	regmap_read(priv->regs, MX25_ADCQ_FIFO, &data);  in mx25_gcq_get_raw_value()
149 		mutex_lock(&priv->lock);  in mx25_gcq_read_raw()
150 		ret = mx25_gcq_get_raw_value(&indio_dev->dev, chan, priv, val);  in mx25_gcq_read_raw()
151 		mutex_unlock(&priv->lock);  in mx25_gcq_read_raw()
155 		*val = priv->channel_vref_mv[chan->channel];  in mx25_gcq_read_raw()
160 		return -EINVAL;  in mx25_gcq_read_raw()
181 	if (priv->vref[refp])  in mx25_gcq_ext_regulator_setup()
184 	ret = snprintf(reg_name, sizeof(reg_name), "vref-%s",  in mx25_gcq_ext_regulator_setup()
189 	priv->vref[refp] = devm_regulator_get_optional(dev, reg_name);  in mx25_gcq_ext_regulator_setup()
190 	if (IS_ERR(priv->vref[refp]))  in mx25_gcq_ext_regulator_setup()
191 		return dev_err_probe(dev, PTR_ERR(priv->vref[refp]),  in mx25_gcq_ext_regulator_setup()
201 	struct device_node *np = pdev->dev.of_node;  in mx25_gcq_setup_cfgs()
203 	struct device *dev = &pdev->dev;  in mx25_gcq_setup_cfgs()
211 		regmap_write(priv->regs, MX25_ADCQ_CFG(i),  in mx25_gcq_setup_cfgs()
235 			return -EINVAL;  in mx25_gcq_setup_cfgs()
238 		of_property_read_u32(child, "fsl,adc-refp", &refp);  in mx25_gcq_setup_cfgs()
239 		of_property_read_u32(child, "fsl,adc-refn", &refn);  in mx25_gcq_setup_cfgs()
245 			ret = mx25_gcq_ext_regulator_setup(&pdev->dev, priv, refp);  in mx25_gcq_setup_cfgs()
250 			priv->channel_vref_mv[reg] =  in mx25_gcq_setup_cfgs()
251 				regulator_get_voltage(priv->vref[refp]);  in mx25_gcq_setup_cfgs()
253 			priv->channel_vref_mv[reg] /= 1000;  in mx25_gcq_setup_cfgs()
256 			priv->channel_vref_mv[reg] = 2500;  in mx25_gcq_setup_cfgs()
261 			return -EINVAL;  in mx25_gcq_setup_cfgs()
272 			dev_err(dev, "Invalid fsl,adc-refp property value\n");  in mx25_gcq_setup_cfgs()
274 			return -EINVAL;  in mx25_gcq_setup_cfgs()
277 			dev_err(dev, "Invalid fsl,adc-refn property value\n");  in mx25_gcq_setup_cfgs()
279 			return -EINVAL;  in mx25_gcq_setup_cfgs()
282 		regmap_update_bits(priv->regs, MX25_ADCQ_CFG(reg),  in mx25_gcq_setup_cfgs()
287 	regmap_update_bits(priv->regs, MX25_ADCQ_CR,  in mx25_gcq_setup_cfgs()
291 	regmap_write(priv->regs, MX25_ADCQ_CR,  in mx25_gcq_setup_cfgs()
301 	struct mx25_tsadc *tsadc = dev_get_drvdata(pdev->dev.parent);  in mx25_gcq_probe()
302 	struct device *dev = &pdev->dev;  in mx25_gcq_probe()
309 		return -ENOMEM;  in mx25_gcq_probe()
317 	priv->regs = devm_regmap_init_mmio(dev, mem, &mx25_gcq_regconfig);  in mx25_gcq_probe()
318 	if (IS_ERR(priv->regs)) {  in mx25_gcq_probe()
320 		return PTR_ERR(priv->regs);  in mx25_gcq_probe()
323 	mutex_init(&priv->lock);  in mx25_gcq_probe()
325 	init_completion(&priv->completed);  in mx25_gcq_probe()
332 		if (!priv->vref[i])  in mx25_gcq_probe()
335 		ret = regulator_enable(priv->vref[i]);  in mx25_gcq_probe()
340 	priv->clk = tsadc->clk;  in mx25_gcq_probe()
341 	ret = clk_prepare_enable(priv->clk);  in mx25_gcq_probe()
351 	priv->irq = ret;  in mx25_gcq_probe()
352 	ret = request_irq(priv->irq, mx25_gcq_irq, 0, pdev->name, priv);  in mx25_gcq_probe()
358 	indio_dev->channels = mx25_gcq_channels;  in mx25_gcq_probe()
359 	indio_dev->num_channels = ARRAY_SIZE(mx25_gcq_channels);  in mx25_gcq_probe()
360 	indio_dev->info = &mx25_gcq_iio_info;  in mx25_gcq_probe()
361 	indio_dev->name = driver_name;  in mx25_gcq_probe()
374 	free_irq(priv->irq, priv);  in mx25_gcq_probe()
376 	clk_disable_unprepare(priv->clk);  in mx25_gcq_probe()
380 	for (; i-- > 0;) {  in mx25_gcq_probe()
381 		if (priv->vref[i])  in mx25_gcq_probe()
382 			regulator_disable(priv->vref[i]);  in mx25_gcq_probe()
394 	free_irq(priv->irq, priv);  in mx25_gcq_remove()
395 	clk_disable_unprepare(priv->clk);  in mx25_gcq_remove()
396 	for (i = 4; i-- > 0;) {  in mx25_gcq_remove()
397 		if (priv->vref[i])  in mx25_gcq_remove()
398 			regulator_disable(priv->vref[i]);  in mx25_gcq_remove()
405 	{ .compatible = "fsl,imx25-gcq", },
412 		.name	= "mx25-gcq",