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![Alexandru Ardelean](/assets/img/avatar_default.png)
This patch applies the semantic patch: @@ expression I, P, SP; @@ I = devm_iio_device_alloc(P, SP); ... - I->dev.parent = P; It updates 302 files and does 307 deletions. This semantic patch also removes some comments like '/* Establish that the iio_dev is a child of the i2c device */' But this is is only done in case where the block is left empty. The patch does not seem to cover all cases. It looks like in some cases a different variable is used in some cases to assign the parent, but it points to the same reference. In other cases, the block covered by ... may be just too big to be covered by the semantic patch. However, this looks pretty good as well, as it does cover a big bulk of the drivers that should remove the parent assignment. Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
203 lines
4.6 KiB
C
203 lines
4.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* IIO DAC driver for NXP LPC18xx DAC
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*
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* Copyright (C) 2016 Joachim Eastwood <manabian@gmail.com>
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*
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* UNSUPPORTED hardware features:
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* - Interrupts
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* - DMA
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*/
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#include <linux/clk.h>
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#include <linux/err.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/driver.h>
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#include <linux/io.h>
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#include <linux/iopoll.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/regulator/consumer.h>
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/* LPC18XX DAC registers and bits */
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#define LPC18XX_DAC_CR 0x000
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#define LPC18XX_DAC_CR_VALUE_SHIFT 6
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#define LPC18XX_DAC_CR_VALUE_MASK 0x3ff
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#define LPC18XX_DAC_CR_BIAS BIT(16)
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#define LPC18XX_DAC_CTRL 0x004
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#define LPC18XX_DAC_CTRL_DMA_ENA BIT(3)
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struct lpc18xx_dac {
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struct regulator *vref;
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void __iomem *base;
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struct mutex lock;
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struct clk *clk;
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};
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static const struct iio_chan_spec lpc18xx_dac_iio_channels[] = {
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{
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.type = IIO_VOLTAGE,
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.output = 1,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
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BIT(IIO_CHAN_INFO_SCALE),
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},
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};
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static int lpc18xx_dac_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val, int *val2, long mask)
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{
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struct lpc18xx_dac *dac = iio_priv(indio_dev);
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u32 reg;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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reg = readl(dac->base + LPC18XX_DAC_CR);
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*val = reg >> LPC18XX_DAC_CR_VALUE_SHIFT;
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*val &= LPC18XX_DAC_CR_VALUE_MASK;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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*val = regulator_get_voltage(dac->vref) / 1000;
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*val2 = 10;
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return IIO_VAL_FRACTIONAL_LOG2;
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}
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return -EINVAL;
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}
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static int lpc18xx_dac_write_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int val, int val2, long mask)
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{
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struct lpc18xx_dac *dac = iio_priv(indio_dev);
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u32 reg;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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if (val < 0 || val > LPC18XX_DAC_CR_VALUE_MASK)
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return -EINVAL;
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reg = LPC18XX_DAC_CR_BIAS;
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reg |= val << LPC18XX_DAC_CR_VALUE_SHIFT;
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mutex_lock(&dac->lock);
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writel(reg, dac->base + LPC18XX_DAC_CR);
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writel(LPC18XX_DAC_CTRL_DMA_ENA, dac->base + LPC18XX_DAC_CTRL);
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mutex_unlock(&dac->lock);
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return 0;
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}
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return -EINVAL;
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}
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static const struct iio_info lpc18xx_dac_info = {
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.read_raw = lpc18xx_dac_read_raw,
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.write_raw = lpc18xx_dac_write_raw,
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};
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static int lpc18xx_dac_probe(struct platform_device *pdev)
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{
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struct iio_dev *indio_dev;
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struct lpc18xx_dac *dac;
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int ret;
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indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*dac));
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if (!indio_dev)
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return -ENOMEM;
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platform_set_drvdata(pdev, indio_dev);
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dac = iio_priv(indio_dev);
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mutex_init(&dac->lock);
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dac->base = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(dac->base))
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return PTR_ERR(dac->base);
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dac->clk = devm_clk_get(&pdev->dev, NULL);
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if (IS_ERR(dac->clk)) {
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dev_err(&pdev->dev, "error getting clock\n");
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return PTR_ERR(dac->clk);
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}
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dac->vref = devm_regulator_get(&pdev->dev, "vref");
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if (IS_ERR(dac->vref)) {
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dev_err(&pdev->dev, "error getting regulator\n");
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return PTR_ERR(dac->vref);
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}
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indio_dev->name = dev_name(&pdev->dev);
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indio_dev->info = &lpc18xx_dac_info;
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->channels = lpc18xx_dac_iio_channels;
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indio_dev->num_channels = ARRAY_SIZE(lpc18xx_dac_iio_channels);
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ret = regulator_enable(dac->vref);
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if (ret) {
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dev_err(&pdev->dev, "unable to enable regulator\n");
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return ret;
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}
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ret = clk_prepare_enable(dac->clk);
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if (ret) {
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dev_err(&pdev->dev, "unable to enable clock\n");
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goto dis_reg;
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}
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writel(0, dac->base + LPC18XX_DAC_CTRL);
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writel(0, dac->base + LPC18XX_DAC_CR);
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ret = iio_device_register(indio_dev);
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if (ret) {
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dev_err(&pdev->dev, "unable to register device\n");
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goto dis_clk;
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}
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return 0;
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dis_clk:
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clk_disable_unprepare(dac->clk);
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dis_reg:
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regulator_disable(dac->vref);
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return ret;
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}
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static int lpc18xx_dac_remove(struct platform_device *pdev)
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{
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struct iio_dev *indio_dev = platform_get_drvdata(pdev);
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struct lpc18xx_dac *dac = iio_priv(indio_dev);
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iio_device_unregister(indio_dev);
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writel(0, dac->base + LPC18XX_DAC_CTRL);
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clk_disable_unprepare(dac->clk);
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regulator_disable(dac->vref);
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return 0;
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}
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static const struct of_device_id lpc18xx_dac_match[] = {
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{ .compatible = "nxp,lpc1850-dac" },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, lpc18xx_dac_match);
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static struct platform_driver lpc18xx_dac_driver = {
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.probe = lpc18xx_dac_probe,
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.remove = lpc18xx_dac_remove,
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.driver = {
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.name = "lpc18xx-dac",
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.of_match_table = lpc18xx_dac_match,
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},
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};
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module_platform_driver(lpc18xx_dac_driver);
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MODULE_DESCRIPTION("LPC18xx DAC driver");
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MODULE_AUTHOR("Joachim Eastwood <manabian@gmail.com>");
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MODULE_LICENSE("GPL v2");
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