// SPDX-License-Identifier: GPL-2.0-or-later /* * Freescale Vybrid vf610 DAC driver * * Copyright 2016 Toradex AG */ #include #include #include #include #include #include #include #include #include #include #include #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 "); MODULE_DESCRIPTION("Freescale VF610 DAC driver"); MODULE_LICENSE("GPL v2");