1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Freescale Vybrid vf610 DAC driver
5 * Copyright 2016 Toradex AG
10 #include <linux/interrupt.h>
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/platform_device.h>
15 #include <linux/regulator/consumer.h>
16 #include <linux/slab.h>
18 #include <linux/iio/iio.h>
19 #include <linux/iio/sysfs.h>
21 #define VF610_DACx_STATCTRL 0x20
23 #define VF610_DAC_DACEN BIT(15)
24 #define VF610_DAC_DACRFS BIT(14)
25 #define VF610_DAC_LPEN BIT(11)
27 #define VF610_DAC_DAT0(x) ((x) & 0xFFF)
29 enum vf610_conversion_mode_sel {
30 VF610_DAC_CONV_HIGH_POWER,
31 VF610_DAC_CONV_LOW_POWER,
37 enum vf610_conversion_mode_sel conv_mode;
41 static void vf610_dac_init(struct vf610_dac *info)
45 info->conv_mode = VF610_DAC_CONV_LOW_POWER;
46 val = VF610_DAC_DACEN | VF610_DAC_DACRFS |
48 writel(val, info->regs + VF610_DACx_STATCTRL);
51 static void vf610_dac_exit(struct vf610_dac *info)
55 val = readl(info->regs + VF610_DACx_STATCTRL);
56 val &= ~VF610_DAC_DACEN;
57 writel(val, info->regs + VF610_DACx_STATCTRL);
60 static int vf610_set_conversion_mode(struct iio_dev *indio_dev,
61 const struct iio_chan_spec *chan,
64 struct vf610_dac *info = iio_priv(indio_dev);
67 mutex_lock(&indio_dev->mlock);
68 info->conv_mode = mode;
69 val = readl(info->regs + VF610_DACx_STATCTRL);
71 val |= VF610_DAC_LPEN;
73 val &= ~VF610_DAC_LPEN;
74 writel(val, info->regs + VF610_DACx_STATCTRL);
75 mutex_unlock(&indio_dev->mlock);
80 static int vf610_get_conversion_mode(struct iio_dev *indio_dev,
81 const struct iio_chan_spec *chan)
83 struct vf610_dac *info = iio_priv(indio_dev);
85 return info->conv_mode;
88 static const char * const vf610_conv_modes[] = { "high-power", "low-power" };
90 static const struct iio_enum vf610_conversion_mode = {
91 .items = vf610_conv_modes,
92 .num_items = ARRAY_SIZE(vf610_conv_modes),
93 .get = vf610_get_conversion_mode,
94 .set = vf610_set_conversion_mode,
97 static const struct iio_chan_spec_ext_info vf610_ext_info[] = {
98 IIO_ENUM("conversion_mode", IIO_SHARED_BY_DIR,
99 &vf610_conversion_mode),
103 #define VF610_DAC_CHAN(_chan_type) { \
104 .type = (_chan_type), \
106 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
107 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
108 .ext_info = vf610_ext_info, \
111 static const struct iio_chan_spec vf610_dac_iio_channels[] = {
112 VF610_DAC_CHAN(IIO_VOLTAGE),
115 static int vf610_read_raw(struct iio_dev *indio_dev,
116 struct iio_chan_spec const *chan,
120 struct vf610_dac *info = iio_priv(indio_dev);
123 case IIO_CHAN_INFO_RAW:
124 *val = VF610_DAC_DAT0(readl(info->regs));
126 case IIO_CHAN_INFO_SCALE:
128 * DACRFS is always 1 for valid reference and typical
129 * reference voltage as per Vybrid datasheet is 3.3V
130 * from section 9.1.2.1 of Vybrid datasheet
132 *val = 3300 /* mV */;
134 return IIO_VAL_FRACTIONAL_LOG2;
141 static int vf610_write_raw(struct iio_dev *indio_dev,
142 struct iio_chan_spec const *chan,
146 struct vf610_dac *info = iio_priv(indio_dev);
149 case IIO_CHAN_INFO_RAW:
150 mutex_lock(&indio_dev->mlock);
151 writel(VF610_DAC_DAT0(val), info->regs);
152 mutex_unlock(&indio_dev->mlock);
160 static const struct iio_info vf610_dac_iio_info = {
161 .read_raw = &vf610_read_raw,
162 .write_raw = &vf610_write_raw,
165 static const struct of_device_id vf610_dac_match[] = {
166 { .compatible = "fsl,vf610-dac", },
169 MODULE_DEVICE_TABLE(of, vf610_dac_match);
171 static int vf610_dac_probe(struct platform_device *pdev)
173 struct iio_dev *indio_dev;
174 struct vf610_dac *info;
175 struct resource *mem;
178 indio_dev = devm_iio_device_alloc(&pdev->dev,
179 sizeof(struct vf610_dac));
181 dev_err(&pdev->dev, "Failed allocating iio device\n");
185 info = iio_priv(indio_dev);
186 info->dev = &pdev->dev;
188 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
189 info->regs = devm_ioremap_resource(&pdev->dev, mem);
190 if (IS_ERR(info->regs))
191 return PTR_ERR(info->regs);
193 info->clk = devm_clk_get(&pdev->dev, "dac");
194 if (IS_ERR(info->clk)) {
195 dev_err(&pdev->dev, "Failed getting clock, err = %ld\n",
197 return PTR_ERR(info->clk);
200 platform_set_drvdata(pdev, indio_dev);
202 indio_dev->name = dev_name(&pdev->dev);
203 indio_dev->dev.parent = &pdev->dev;
204 indio_dev->dev.of_node = pdev->dev.of_node;
205 indio_dev->info = &vf610_dac_iio_info;
206 indio_dev->modes = INDIO_DIRECT_MODE;
207 indio_dev->channels = vf610_dac_iio_channels;
208 indio_dev->num_channels = ARRAY_SIZE(vf610_dac_iio_channels);
210 ret = clk_prepare_enable(info->clk);
213 "Could not prepare or enable the clock\n");
217 vf610_dac_init(info);
219 ret = iio_device_register(indio_dev);
221 dev_err(&pdev->dev, "Couldn't register the device\n");
222 goto error_iio_device_register;
227 error_iio_device_register:
228 clk_disable_unprepare(info->clk);
233 static int vf610_dac_remove(struct platform_device *pdev)
235 struct iio_dev *indio_dev = platform_get_drvdata(pdev);
236 struct vf610_dac *info = iio_priv(indio_dev);
238 iio_device_unregister(indio_dev);
239 vf610_dac_exit(info);
240 clk_disable_unprepare(info->clk);
245 #ifdef CONFIG_PM_SLEEP
246 static int vf610_dac_suspend(struct device *dev)
248 struct iio_dev *indio_dev = dev_get_drvdata(dev);
249 struct vf610_dac *info = iio_priv(indio_dev);
251 vf610_dac_exit(info);
252 clk_disable_unprepare(info->clk);
257 static int vf610_dac_resume(struct device *dev)
259 struct iio_dev *indio_dev = dev_get_drvdata(dev);
260 struct vf610_dac *info = iio_priv(indio_dev);
263 ret = clk_prepare_enable(info->clk);
267 vf610_dac_init(info);
273 static SIMPLE_DEV_PM_OPS(vf610_dac_pm_ops, vf610_dac_suspend, vf610_dac_resume);
275 static struct platform_driver vf610_dac_driver = {
276 .probe = vf610_dac_probe,
277 .remove = vf610_dac_remove,
280 .of_match_table = vf610_dac_match,
281 .pm = &vf610_dac_pm_ops,
284 module_platform_driver(vf610_dac_driver);
286 MODULE_AUTHOR("Sanchayan Maity <sanchayan.maity@toradex.com>");
287 MODULE_DESCRIPTION("Freescale VF610 DAC driver");
288 MODULE_LICENSE("GPL v2");