162306a36Sopenharmony_ci// SPDX-License-Identifier: GPL-2.0-or-later
262306a36Sopenharmony_ci/*
362306a36Sopenharmony_ci * Freescale Vybrid vf610 DAC driver
462306a36Sopenharmony_ci *
562306a36Sopenharmony_ci * Copyright 2016 Toradex AG
662306a36Sopenharmony_ci */
762306a36Sopenharmony_ci
862306a36Sopenharmony_ci#include <linux/clk.h>
962306a36Sopenharmony_ci#include <linux/err.h>
1062306a36Sopenharmony_ci#include <linux/interrupt.h>
1162306a36Sopenharmony_ci#include <linux/io.h>
1262306a36Sopenharmony_ci#include <linux/kernel.h>
1362306a36Sopenharmony_ci#include <linux/mod_devicetable.h>
1462306a36Sopenharmony_ci#include <linux/module.h>
1562306a36Sopenharmony_ci#include <linux/platform_device.h>
1662306a36Sopenharmony_ci#include <linux/regulator/consumer.h>
1762306a36Sopenharmony_ci#include <linux/slab.h>
1862306a36Sopenharmony_ci
1962306a36Sopenharmony_ci#include <linux/iio/iio.h>
2062306a36Sopenharmony_ci#include <linux/iio/sysfs.h>
2162306a36Sopenharmony_ci
2262306a36Sopenharmony_ci#define VF610_DACx_STATCTRL		0x20
2362306a36Sopenharmony_ci
2462306a36Sopenharmony_ci#define VF610_DAC_DACEN			BIT(15)
2562306a36Sopenharmony_ci#define VF610_DAC_DACRFS		BIT(14)
2662306a36Sopenharmony_ci#define VF610_DAC_LPEN			BIT(11)
2762306a36Sopenharmony_ci
2862306a36Sopenharmony_ci#define VF610_DAC_DAT0(x)		((x) & 0xFFF)
2962306a36Sopenharmony_ci
3062306a36Sopenharmony_cienum vf610_conversion_mode_sel {
3162306a36Sopenharmony_ci	VF610_DAC_CONV_HIGH_POWER,
3262306a36Sopenharmony_ci	VF610_DAC_CONV_LOW_POWER,
3362306a36Sopenharmony_ci};
3462306a36Sopenharmony_ci
3562306a36Sopenharmony_cistruct vf610_dac {
3662306a36Sopenharmony_ci	struct clk *clk;
3762306a36Sopenharmony_ci	struct device *dev;
3862306a36Sopenharmony_ci	enum vf610_conversion_mode_sel conv_mode;
3962306a36Sopenharmony_ci	void __iomem *regs;
4062306a36Sopenharmony_ci	struct mutex lock;
4162306a36Sopenharmony_ci};
4262306a36Sopenharmony_ci
4362306a36Sopenharmony_cistatic void vf610_dac_init(struct vf610_dac *info)
4462306a36Sopenharmony_ci{
4562306a36Sopenharmony_ci	int val;
4662306a36Sopenharmony_ci
4762306a36Sopenharmony_ci	info->conv_mode = VF610_DAC_CONV_LOW_POWER;
4862306a36Sopenharmony_ci	val = VF610_DAC_DACEN | VF610_DAC_DACRFS |
4962306a36Sopenharmony_ci		VF610_DAC_LPEN;
5062306a36Sopenharmony_ci	writel(val, info->regs + VF610_DACx_STATCTRL);
5162306a36Sopenharmony_ci}
5262306a36Sopenharmony_ci
5362306a36Sopenharmony_cistatic void vf610_dac_exit(struct vf610_dac *info)
5462306a36Sopenharmony_ci{
5562306a36Sopenharmony_ci	int val;
5662306a36Sopenharmony_ci
5762306a36Sopenharmony_ci	val = readl(info->regs + VF610_DACx_STATCTRL);
5862306a36Sopenharmony_ci	val &= ~VF610_DAC_DACEN;
5962306a36Sopenharmony_ci	writel(val, info->regs + VF610_DACx_STATCTRL);
6062306a36Sopenharmony_ci}
6162306a36Sopenharmony_ci
6262306a36Sopenharmony_cistatic int vf610_set_conversion_mode(struct iio_dev *indio_dev,
6362306a36Sopenharmony_ci				const struct iio_chan_spec *chan,
6462306a36Sopenharmony_ci				unsigned int mode)
6562306a36Sopenharmony_ci{
6662306a36Sopenharmony_ci	struct vf610_dac *info = iio_priv(indio_dev);
6762306a36Sopenharmony_ci	int val;
6862306a36Sopenharmony_ci
6962306a36Sopenharmony_ci	mutex_lock(&info->lock);
7062306a36Sopenharmony_ci	info->conv_mode = mode;
7162306a36Sopenharmony_ci	val = readl(info->regs + VF610_DACx_STATCTRL);
7262306a36Sopenharmony_ci	if (mode)
7362306a36Sopenharmony_ci		val |= VF610_DAC_LPEN;
7462306a36Sopenharmony_ci	else
7562306a36Sopenharmony_ci		val &= ~VF610_DAC_LPEN;
7662306a36Sopenharmony_ci	writel(val, info->regs + VF610_DACx_STATCTRL);
7762306a36Sopenharmony_ci	mutex_unlock(&info->lock);
7862306a36Sopenharmony_ci
7962306a36Sopenharmony_ci	return 0;
8062306a36Sopenharmony_ci}
8162306a36Sopenharmony_ci
8262306a36Sopenharmony_cistatic int vf610_get_conversion_mode(struct iio_dev *indio_dev,
8362306a36Sopenharmony_ci				const struct iio_chan_spec *chan)
8462306a36Sopenharmony_ci{
8562306a36Sopenharmony_ci	struct vf610_dac *info = iio_priv(indio_dev);
8662306a36Sopenharmony_ci
8762306a36Sopenharmony_ci	return info->conv_mode;
8862306a36Sopenharmony_ci}
8962306a36Sopenharmony_ci
9062306a36Sopenharmony_cistatic const char * const vf610_conv_modes[] = { "high-power", "low-power" };
9162306a36Sopenharmony_ci
9262306a36Sopenharmony_cistatic const struct iio_enum vf610_conversion_mode = {
9362306a36Sopenharmony_ci	.items = vf610_conv_modes,
9462306a36Sopenharmony_ci	.num_items = ARRAY_SIZE(vf610_conv_modes),
9562306a36Sopenharmony_ci	.get = vf610_get_conversion_mode,
9662306a36Sopenharmony_ci	.set = vf610_set_conversion_mode,
9762306a36Sopenharmony_ci};
9862306a36Sopenharmony_ci
9962306a36Sopenharmony_cistatic const struct iio_chan_spec_ext_info vf610_ext_info[] = {
10062306a36Sopenharmony_ci	IIO_ENUM("conversion_mode", IIO_SHARED_BY_DIR,
10162306a36Sopenharmony_ci		&vf610_conversion_mode),
10262306a36Sopenharmony_ci	{},
10362306a36Sopenharmony_ci};
10462306a36Sopenharmony_ci
10562306a36Sopenharmony_ci#define VF610_DAC_CHAN(_chan_type) { \
10662306a36Sopenharmony_ci	.type = (_chan_type), \
10762306a36Sopenharmony_ci	.output = 1, \
10862306a36Sopenharmony_ci	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
10962306a36Sopenharmony_ci	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
11062306a36Sopenharmony_ci	.ext_info = vf610_ext_info, \
11162306a36Sopenharmony_ci}
11262306a36Sopenharmony_ci
11362306a36Sopenharmony_cistatic const struct iio_chan_spec vf610_dac_iio_channels[] = {
11462306a36Sopenharmony_ci	VF610_DAC_CHAN(IIO_VOLTAGE),
11562306a36Sopenharmony_ci};
11662306a36Sopenharmony_ci
11762306a36Sopenharmony_cistatic int vf610_read_raw(struct iio_dev *indio_dev,
11862306a36Sopenharmony_ci			struct iio_chan_spec const *chan,
11962306a36Sopenharmony_ci			int *val, int *val2,
12062306a36Sopenharmony_ci			long mask)
12162306a36Sopenharmony_ci{
12262306a36Sopenharmony_ci	struct vf610_dac *info = iio_priv(indio_dev);
12362306a36Sopenharmony_ci
12462306a36Sopenharmony_ci	switch (mask) {
12562306a36Sopenharmony_ci	case IIO_CHAN_INFO_RAW:
12662306a36Sopenharmony_ci		*val = VF610_DAC_DAT0(readl(info->regs));
12762306a36Sopenharmony_ci		return IIO_VAL_INT;
12862306a36Sopenharmony_ci	case IIO_CHAN_INFO_SCALE:
12962306a36Sopenharmony_ci		/*
13062306a36Sopenharmony_ci		 * DACRFS is always 1 for valid reference and typical
13162306a36Sopenharmony_ci		 * reference voltage as per Vybrid datasheet is 3.3V
13262306a36Sopenharmony_ci		 * from section 9.1.2.1 of Vybrid datasheet
13362306a36Sopenharmony_ci		 */
13462306a36Sopenharmony_ci		*val = 3300 /* mV */;
13562306a36Sopenharmony_ci		*val2 = 12;
13662306a36Sopenharmony_ci		return IIO_VAL_FRACTIONAL_LOG2;
13762306a36Sopenharmony_ci
13862306a36Sopenharmony_ci	default:
13962306a36Sopenharmony_ci		return -EINVAL;
14062306a36Sopenharmony_ci	}
14162306a36Sopenharmony_ci}
14262306a36Sopenharmony_ci
14362306a36Sopenharmony_cistatic int vf610_write_raw(struct iio_dev *indio_dev,
14462306a36Sopenharmony_ci			struct iio_chan_spec const *chan,
14562306a36Sopenharmony_ci			int val, int val2,
14662306a36Sopenharmony_ci			long mask)
14762306a36Sopenharmony_ci{
14862306a36Sopenharmony_ci	struct vf610_dac *info = iio_priv(indio_dev);
14962306a36Sopenharmony_ci
15062306a36Sopenharmony_ci	switch (mask) {
15162306a36Sopenharmony_ci	case IIO_CHAN_INFO_RAW:
15262306a36Sopenharmony_ci		mutex_lock(&info->lock);
15362306a36Sopenharmony_ci		writel(VF610_DAC_DAT0(val), info->regs);
15462306a36Sopenharmony_ci		mutex_unlock(&info->lock);
15562306a36Sopenharmony_ci		return 0;
15662306a36Sopenharmony_ci
15762306a36Sopenharmony_ci	default:
15862306a36Sopenharmony_ci		return -EINVAL;
15962306a36Sopenharmony_ci	}
16062306a36Sopenharmony_ci}
16162306a36Sopenharmony_ci
16262306a36Sopenharmony_cistatic const struct iio_info vf610_dac_iio_info = {
16362306a36Sopenharmony_ci	.read_raw = &vf610_read_raw,
16462306a36Sopenharmony_ci	.write_raw = &vf610_write_raw,
16562306a36Sopenharmony_ci};
16662306a36Sopenharmony_ci
16762306a36Sopenharmony_cistatic const struct of_device_id vf610_dac_match[] = {
16862306a36Sopenharmony_ci	{ .compatible = "fsl,vf610-dac", },
16962306a36Sopenharmony_ci	{ /* sentinel */ }
17062306a36Sopenharmony_ci};
17162306a36Sopenharmony_ciMODULE_DEVICE_TABLE(of, vf610_dac_match);
17262306a36Sopenharmony_ci
17362306a36Sopenharmony_cistatic int vf610_dac_probe(struct platform_device *pdev)
17462306a36Sopenharmony_ci{
17562306a36Sopenharmony_ci	struct iio_dev *indio_dev;
17662306a36Sopenharmony_ci	struct vf610_dac *info;
17762306a36Sopenharmony_ci	int ret;
17862306a36Sopenharmony_ci
17962306a36Sopenharmony_ci	indio_dev = devm_iio_device_alloc(&pdev->dev,
18062306a36Sopenharmony_ci					sizeof(struct vf610_dac));
18162306a36Sopenharmony_ci	if (!indio_dev) {
18262306a36Sopenharmony_ci		dev_err(&pdev->dev, "Failed allocating iio device\n");
18362306a36Sopenharmony_ci		return -ENOMEM;
18462306a36Sopenharmony_ci	}
18562306a36Sopenharmony_ci
18662306a36Sopenharmony_ci	info = iio_priv(indio_dev);
18762306a36Sopenharmony_ci	info->dev = &pdev->dev;
18862306a36Sopenharmony_ci
18962306a36Sopenharmony_ci	info->regs = devm_platform_ioremap_resource(pdev, 0);
19062306a36Sopenharmony_ci	if (IS_ERR(info->regs))
19162306a36Sopenharmony_ci		return PTR_ERR(info->regs);
19262306a36Sopenharmony_ci
19362306a36Sopenharmony_ci	info->clk = devm_clk_get(&pdev->dev, "dac");
19462306a36Sopenharmony_ci	if (IS_ERR(info->clk)) {
19562306a36Sopenharmony_ci		dev_err(&pdev->dev, "Failed getting clock, err = %ld\n",
19662306a36Sopenharmony_ci			PTR_ERR(info->clk));
19762306a36Sopenharmony_ci		return PTR_ERR(info->clk);
19862306a36Sopenharmony_ci	}
19962306a36Sopenharmony_ci
20062306a36Sopenharmony_ci	platform_set_drvdata(pdev, indio_dev);
20162306a36Sopenharmony_ci
20262306a36Sopenharmony_ci	indio_dev->name = dev_name(&pdev->dev);
20362306a36Sopenharmony_ci	indio_dev->info = &vf610_dac_iio_info;
20462306a36Sopenharmony_ci	indio_dev->modes = INDIO_DIRECT_MODE;
20562306a36Sopenharmony_ci	indio_dev->channels = vf610_dac_iio_channels;
20662306a36Sopenharmony_ci	indio_dev->num_channels = ARRAY_SIZE(vf610_dac_iio_channels);
20762306a36Sopenharmony_ci
20862306a36Sopenharmony_ci	mutex_init(&info->lock);
20962306a36Sopenharmony_ci
21062306a36Sopenharmony_ci	ret = clk_prepare_enable(info->clk);
21162306a36Sopenharmony_ci	if (ret) {
21262306a36Sopenharmony_ci		dev_err(&pdev->dev,
21362306a36Sopenharmony_ci			"Could not prepare or enable the clock\n");
21462306a36Sopenharmony_ci		return ret;
21562306a36Sopenharmony_ci	}
21662306a36Sopenharmony_ci
21762306a36Sopenharmony_ci	vf610_dac_init(info);
21862306a36Sopenharmony_ci
21962306a36Sopenharmony_ci	ret = iio_device_register(indio_dev);
22062306a36Sopenharmony_ci	if (ret) {
22162306a36Sopenharmony_ci		dev_err(&pdev->dev, "Couldn't register the device\n");
22262306a36Sopenharmony_ci		goto error_iio_device_register;
22362306a36Sopenharmony_ci	}
22462306a36Sopenharmony_ci
22562306a36Sopenharmony_ci	return 0;
22662306a36Sopenharmony_ci
22762306a36Sopenharmony_cierror_iio_device_register:
22862306a36Sopenharmony_ci	vf610_dac_exit(info);
22962306a36Sopenharmony_ci	clk_disable_unprepare(info->clk);
23062306a36Sopenharmony_ci
23162306a36Sopenharmony_ci	return ret;
23262306a36Sopenharmony_ci}
23362306a36Sopenharmony_ci
23462306a36Sopenharmony_cistatic int vf610_dac_remove(struct platform_device *pdev)
23562306a36Sopenharmony_ci{
23662306a36Sopenharmony_ci	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
23762306a36Sopenharmony_ci	struct vf610_dac *info = iio_priv(indio_dev);
23862306a36Sopenharmony_ci
23962306a36Sopenharmony_ci	iio_device_unregister(indio_dev);
24062306a36Sopenharmony_ci	vf610_dac_exit(info);
24162306a36Sopenharmony_ci	clk_disable_unprepare(info->clk);
24262306a36Sopenharmony_ci
24362306a36Sopenharmony_ci	return 0;
24462306a36Sopenharmony_ci}
24562306a36Sopenharmony_ci
24662306a36Sopenharmony_cistatic int vf610_dac_suspend(struct device *dev)
24762306a36Sopenharmony_ci{
24862306a36Sopenharmony_ci	struct iio_dev *indio_dev = dev_get_drvdata(dev);
24962306a36Sopenharmony_ci	struct vf610_dac *info = iio_priv(indio_dev);
25062306a36Sopenharmony_ci
25162306a36Sopenharmony_ci	vf610_dac_exit(info);
25262306a36Sopenharmony_ci	clk_disable_unprepare(info->clk);
25362306a36Sopenharmony_ci
25462306a36Sopenharmony_ci	return 0;
25562306a36Sopenharmony_ci}
25662306a36Sopenharmony_ci
25762306a36Sopenharmony_cistatic int vf610_dac_resume(struct device *dev)
25862306a36Sopenharmony_ci{
25962306a36Sopenharmony_ci	struct iio_dev *indio_dev = dev_get_drvdata(dev);
26062306a36Sopenharmony_ci	struct vf610_dac *info = iio_priv(indio_dev);
26162306a36Sopenharmony_ci	int ret;
26262306a36Sopenharmony_ci
26362306a36Sopenharmony_ci	ret = clk_prepare_enable(info->clk);
26462306a36Sopenharmony_ci	if (ret)
26562306a36Sopenharmony_ci		return ret;
26662306a36Sopenharmony_ci
26762306a36Sopenharmony_ci	vf610_dac_init(info);
26862306a36Sopenharmony_ci
26962306a36Sopenharmony_ci	return 0;
27062306a36Sopenharmony_ci}
27162306a36Sopenharmony_ci
27262306a36Sopenharmony_cistatic DEFINE_SIMPLE_DEV_PM_OPS(vf610_dac_pm_ops, vf610_dac_suspend,
27362306a36Sopenharmony_ci				vf610_dac_resume);
27462306a36Sopenharmony_ci
27562306a36Sopenharmony_cistatic struct platform_driver vf610_dac_driver = {
27662306a36Sopenharmony_ci	.probe          = vf610_dac_probe,
27762306a36Sopenharmony_ci	.remove         = vf610_dac_remove,
27862306a36Sopenharmony_ci	.driver         = {
27962306a36Sopenharmony_ci		.name   = "vf610-dac",
28062306a36Sopenharmony_ci		.of_match_table = vf610_dac_match,
28162306a36Sopenharmony_ci		.pm     = pm_sleep_ptr(&vf610_dac_pm_ops),
28262306a36Sopenharmony_ci	},
28362306a36Sopenharmony_ci};
28462306a36Sopenharmony_cimodule_platform_driver(vf610_dac_driver);
28562306a36Sopenharmony_ci
28662306a36Sopenharmony_ciMODULE_AUTHOR("Sanchayan Maity <sanchayan.maity@toradex.com>");
28762306a36Sopenharmony_ciMODULE_DESCRIPTION("Freescale VF610 DAC driver");
28862306a36Sopenharmony_ciMODULE_LICENSE("GPL v2");
289