1 // SPDX-License-Identifier: GPL-2.0-only
3  * IIO DAC driver for NXP LPC18xx DAC
8  *  - Interrupts
9  *  - DMA
24 /* LPC18XX DAC registers and bits */
52 	struct lpc18xx_dac *dac = iio_priv(indio_dev);  in lpc18xx_dac_read_raw()  local
57 		reg = readl(dac->base + LPC18XX_DAC_CR);  in lpc18xx_dac_read_raw()
64 		*val = regulator_get_voltage(dac->vref) / 1000;  in lpc18xx_dac_read_raw()
70 	return -EINVAL;  in lpc18xx_dac_read_raw()
77 	struct lpc18xx_dac *dac = iio_priv(indio_dev);  in lpc18xx_dac_write_raw()  local
83 			return -EINVAL;  in lpc18xx_dac_write_raw()
88 		mutex_lock(&dac->lock);  in lpc18xx_dac_write_raw()
89 		writel(reg, dac->base + LPC18XX_DAC_CR);  in lpc18xx_dac_write_raw()
90 		writel(LPC18XX_DAC_CTRL_DMA_ENA, dac->base + LPC18XX_DAC_CTRL);  in lpc18xx_dac_write_raw()
91 		mutex_unlock(&dac->lock);  in lpc18xx_dac_write_raw()
96 	return -EINVAL;  in lpc18xx_dac_write_raw()
107 	struct lpc18xx_dac *dac;  in lpc18xx_dac_probe()  local
110 	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*dac));  in lpc18xx_dac_probe()
112 		return -ENOMEM;  in lpc18xx_dac_probe()
115 	dac = iio_priv(indio_dev);  in lpc18xx_dac_probe()
116 	mutex_init(&dac->lock);  in lpc18xx_dac_probe()
118 	dac->base = devm_platform_ioremap_resource(pdev, 0);  in lpc18xx_dac_probe()
119 	if (IS_ERR(dac->base))  in lpc18xx_dac_probe()
120 		return PTR_ERR(dac->base);  in lpc18xx_dac_probe()
122 	dac->clk = devm_clk_get(&pdev->dev, NULL);  in lpc18xx_dac_probe()
123 	if (IS_ERR(dac->clk))  in lpc18xx_dac_probe()
124 		return dev_err_probe(&pdev->dev, PTR_ERR(dac->clk),  in lpc18xx_dac_probe()
127 	dac->vref = devm_regulator_get(&pdev->dev, "vref");  in lpc18xx_dac_probe()
128 	if (IS_ERR(dac->vref))  in lpc18xx_dac_probe()
129 		return dev_err_probe(&pdev->dev, PTR_ERR(dac->vref),  in lpc18xx_dac_probe()
132 	indio_dev->name = dev_name(&pdev->dev);  in lpc18xx_dac_probe()
133 	indio_dev->info = &lpc18xx_dac_info;  in lpc18xx_dac_probe()
134 	indio_dev->modes = INDIO_DIRECT_MODE;  in lpc18xx_dac_probe()
135 	indio_dev->channels = lpc18xx_dac_iio_channels;  in lpc18xx_dac_probe()
136 	indio_dev->num_channels = ARRAY_SIZE(lpc18xx_dac_iio_channels);  in lpc18xx_dac_probe()
138 	ret = regulator_enable(dac->vref);  in lpc18xx_dac_probe()
140 		dev_err(&pdev->dev, "unable to enable regulator\n");  in lpc18xx_dac_probe()
144 	ret = clk_prepare_enable(dac->clk);  in lpc18xx_dac_probe()
146 		dev_err(&pdev->dev, "unable to enable clock\n");  in lpc18xx_dac_probe()
150 	writel(0, dac->base + LPC18XX_DAC_CTRL);  in lpc18xx_dac_probe()
151 	writel(0, dac->base + LPC18XX_DAC_CR);  in lpc18xx_dac_probe()
155 		dev_err(&pdev->dev, "unable to register device\n");  in lpc18xx_dac_probe()
162 	clk_disable_unprepare(dac->clk);  in lpc18xx_dac_probe()
164 	regulator_disable(dac->vref);  in lpc18xx_dac_probe()
171 	struct lpc18xx_dac *dac = iio_priv(indio_dev);  in lpc18xx_dac_remove()  local
175 	writel(0, dac->base + LPC18XX_DAC_CTRL);  in lpc18xx_dac_remove()
176 	clk_disable_unprepare(dac->clk);  in lpc18xx_dac_remove()
177 	regulator_disable(dac->vref);  in lpc18xx_dac_remove()
181 	{ .compatible = "nxp,lpc1850-dac" },
190 		.name = "lpc18xx-dac",
196 MODULE_DESCRIPTION("LPC18xx DAC driver");