| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * Freescale Vybrid vf610 DAC driver |
| * |
| * Copyright 2016 Toradex AG |
| */ |
| |
| #include <linux/clk.h> |
| #include <linux/err.h> |
| #include <linux/interrupt.h> |
| #include <linux/io.h> |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/platform_device.h> |
| #include <linux/regulator/consumer.h> |
| #include <linux/slab.h> |
| |
| #include <linux/iio/iio.h> |
| #include <linux/iio/sysfs.h> |
| |
| #define VF610_DACx_STATCTRL 0x20 |
| |
| #define VF610_DAC_DACEN BIT(15) |
| #define VF610_DAC_DACRFS BIT(14) |
| #define VF610_DAC_LPEN BIT(11) |
| |
| #define VF610_DAC_DAT0(x) ((x) & 0xFFF) |
| |
| enum vf610_conversion_mode_sel { |
| VF610_DAC_CONV_HIGH_POWER, |
| VF610_DAC_CONV_LOW_POWER, |
| }; |
| |
| struct vf610_dac { |
| struct clk *clk; |
| struct device *dev; |
| enum vf610_conversion_mode_sel conv_mode; |
| void __iomem *regs; |
| }; |
| |
| static void vf610_dac_init(struct vf610_dac *info) |
| { |
| int val; |
| |
| info->conv_mode = VF610_DAC_CONV_LOW_POWER; |
| val = VF610_DAC_DACEN | VF610_DAC_DACRFS | |
| VF610_DAC_LPEN; |
| writel(val, info->regs + VF610_DACx_STATCTRL); |
| } |
| |
| static void vf610_dac_exit(struct vf610_dac *info) |
| { |
| int val; |
| |
| val = readl(info->regs + VF610_DACx_STATCTRL); |
| val &= ~VF610_DAC_DACEN; |
| writel(val, info->regs + VF610_DACx_STATCTRL); |
| } |
| |
| static int vf610_set_conversion_mode(struct iio_dev *indio_dev, |
| const struct iio_chan_spec *chan, |
| unsigned int mode) |
| { |
| struct vf610_dac *info = iio_priv(indio_dev); |
| int val; |
| |
| mutex_lock(&indio_dev->mlock); |
| info->conv_mode = mode; |
| val = readl(info->regs + VF610_DACx_STATCTRL); |
| if (mode) |
| val |= VF610_DAC_LPEN; |
| else |
| val &= ~VF610_DAC_LPEN; |
| writel(val, info->regs + VF610_DACx_STATCTRL); |
| mutex_unlock(&indio_dev->mlock); |
| |
| return 0; |
| } |
| |
| static int vf610_get_conversion_mode(struct iio_dev *indio_dev, |
| const struct iio_chan_spec *chan) |
| { |
| struct vf610_dac *info = iio_priv(indio_dev); |
| |
| return info->conv_mode; |
| } |
| |
| static const char * const vf610_conv_modes[] = { "high-power", "low-power" }; |
| |
| static const struct iio_enum vf610_conversion_mode = { |
| .items = vf610_conv_modes, |
| .num_items = ARRAY_SIZE(vf610_conv_modes), |
| .get = vf610_get_conversion_mode, |
| .set = vf610_set_conversion_mode, |
| }; |
| |
| static const struct iio_chan_spec_ext_info vf610_ext_info[] = { |
| IIO_ENUM("conversion_mode", IIO_SHARED_BY_DIR, |
| &vf610_conversion_mode), |
| {}, |
| }; |
| |
| #define VF610_DAC_CHAN(_chan_type) { \ |
| .type = (_chan_type), \ |
| .output = 1, \ |
| .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ |
| .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ |
| .ext_info = vf610_ext_info, \ |
| } |
| |
| static const struct iio_chan_spec vf610_dac_iio_channels[] = { |
| VF610_DAC_CHAN(IIO_VOLTAGE), |
| }; |
| |
| static int vf610_read_raw(struct iio_dev *indio_dev, |
| struct iio_chan_spec const *chan, |
| int *val, int *val2, |
| long mask) |
| { |
| struct vf610_dac *info = iio_priv(indio_dev); |
| |
| switch (mask) { |
| case IIO_CHAN_INFO_RAW: |
| *val = VF610_DAC_DAT0(readl(info->regs)); |
| return IIO_VAL_INT; |
| case IIO_CHAN_INFO_SCALE: |
| /* |
| * DACRFS is always 1 for valid reference and typical |
| * reference voltage as per Vybrid datasheet is 3.3V |
| * from section 9.1.2.1 of Vybrid datasheet |
| */ |
| *val = 3300 /* mV */; |
| *val2 = 12; |
| return IIO_VAL_FRACTIONAL_LOG2; |
| |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| static int vf610_write_raw(struct iio_dev *indio_dev, |
| struct iio_chan_spec const *chan, |
| int val, int val2, |
| long mask) |
| { |
| struct vf610_dac *info = iio_priv(indio_dev); |
| |
| switch (mask) { |
| case IIO_CHAN_INFO_RAW: |
| mutex_lock(&indio_dev->mlock); |
| writel(VF610_DAC_DAT0(val), info->regs); |
| mutex_unlock(&indio_dev->mlock); |
| return 0; |
| |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| static const struct iio_info vf610_dac_iio_info = { |
| .read_raw = &vf610_read_raw, |
| .write_raw = &vf610_write_raw, |
| }; |
| |
| static const struct of_device_id vf610_dac_match[] = { |
| { .compatible = "fsl,vf610-dac", }, |
| { /* sentinel */ } |
| }; |
| MODULE_DEVICE_TABLE(of, vf610_dac_match); |
| |
| static int vf610_dac_probe(struct platform_device *pdev) |
| { |
| struct iio_dev *indio_dev; |
| struct vf610_dac *info; |
| struct resource *mem; |
| int ret; |
| |
| indio_dev = devm_iio_device_alloc(&pdev->dev, |
| sizeof(struct vf610_dac)); |
| if (!indio_dev) { |
| dev_err(&pdev->dev, "Failed allocating iio device\n"); |
| return -ENOMEM; |
| } |
| |
| info = iio_priv(indio_dev); |
| info->dev = &pdev->dev; |
| |
| mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| info->regs = devm_ioremap_resource(&pdev->dev, mem); |
| if (IS_ERR(info->regs)) |
| return PTR_ERR(info->regs); |
| |
| info->clk = devm_clk_get(&pdev->dev, "dac"); |
| if (IS_ERR(info->clk)) { |
| dev_err(&pdev->dev, "Failed getting clock, err = %ld\n", |
| PTR_ERR(info->clk)); |
| return PTR_ERR(info->clk); |
| } |
| |
| platform_set_drvdata(pdev, indio_dev); |
| |
| indio_dev->name = dev_name(&pdev->dev); |
| indio_dev->dev.parent = &pdev->dev; |
| indio_dev->dev.of_node = pdev->dev.of_node; |
| indio_dev->info = &vf610_dac_iio_info; |
| indio_dev->modes = INDIO_DIRECT_MODE; |
| indio_dev->channels = vf610_dac_iio_channels; |
| indio_dev->num_channels = ARRAY_SIZE(vf610_dac_iio_channels); |
| |
| ret = clk_prepare_enable(info->clk); |
| if (ret) { |
| dev_err(&pdev->dev, |
| "Could not prepare or enable the clock\n"); |
| return ret; |
| } |
| |
| vf610_dac_init(info); |
| |
| ret = iio_device_register(indio_dev); |
| if (ret) { |
| dev_err(&pdev->dev, "Couldn't register the device\n"); |
| goto error_iio_device_register; |
| } |
| |
| return 0; |
| |
| error_iio_device_register: |
| vf610_dac_exit(info); |
| clk_disable_unprepare(info->clk); |
| |
| return ret; |
| } |
| |
| static int vf610_dac_remove(struct platform_device *pdev) |
| { |
| struct iio_dev *indio_dev = platform_get_drvdata(pdev); |
| struct vf610_dac *info = iio_priv(indio_dev); |
| |
| iio_device_unregister(indio_dev); |
| vf610_dac_exit(info); |
| clk_disable_unprepare(info->clk); |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_PM_SLEEP |
| static int vf610_dac_suspend(struct device *dev) |
| { |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct vf610_dac *info = iio_priv(indio_dev); |
| |
| vf610_dac_exit(info); |
| clk_disable_unprepare(info->clk); |
| |
| return 0; |
| } |
| |
| static int vf610_dac_resume(struct device *dev) |
| { |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct vf610_dac *info = iio_priv(indio_dev); |
| int ret; |
| |
| ret = clk_prepare_enable(info->clk); |
| if (ret) |
| return ret; |
| |
| vf610_dac_init(info); |
| |
| return 0; |
| } |
| #endif |
| |
| static SIMPLE_DEV_PM_OPS(vf610_dac_pm_ops, vf610_dac_suspend, vf610_dac_resume); |
| |
| static struct platform_driver vf610_dac_driver = { |
| .probe = vf610_dac_probe, |
| .remove = vf610_dac_remove, |
| .driver = { |
| .name = "vf610-dac", |
| .of_match_table = vf610_dac_match, |
| .pm = &vf610_dac_pm_ops, |
| }, |
| }; |
| module_platform_driver(vf610_dac_driver); |
| |
| MODULE_AUTHOR("Sanchayan Maity <sanchayan.maity@toradex.com>"); |
| MODULE_DESCRIPTION("Freescale VF610 DAC driver"); |
| MODULE_LICENSE("GPL v2"); |