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