2 * MEN 16z188 Analog to Digial Converter
4 * Copyright (C) 2014 MEN Mikroelektronik GmbH (www.men.de)
5 * Author: Johannes Thumshirn <johannes.thumshirn@men.de>
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the Free
9 * Software Foundation; version 2 of the License.
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/mcb.h>
16 #include <linux/iio/iio.h>
18 #define Z188_ADC_MAX_CHAN 8
19 #define Z188_ADC_GAIN 0x0700000
20 #define Z188_MODE_VOLTAGE BIT(27)
21 #define Z188_CFG_AUTO 0x1
22 #define Z188_CTRL_REG 0x40
24 #define ADC_DATA(x) (((x) >> 2) & 0x7ffffc)
25 #define ADC_OVR(x) ((x) & 0x1)
32 #define Z188_ADC_CHANNEL(idx) { \
33 .type = IIO_VOLTAGE, \
36 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
39 static const struct iio_chan_spec z188_adc_iio_channels[] = {
50 static int z188_iio_read_raw(struct iio_dev *iio_dev,
51 struct iio_chan_spec const *chan,
56 struct z188_adc *adc = iio_priv(iio_dev);
61 case IIO_CHAN_INFO_RAW:
62 tmp = readw(adc->base + chan->channel * 4);
65 dev_info(&iio_dev->dev,
66 "Oversampling error on ADC channel %d\n",
81 static struct iio_info z188_adc_info = {
82 .read_raw = &z188_iio_read_raw,
83 .driver_module = THIS_MODULE,
86 static void men_z188_config_channels(void __iomem *addr)
92 ctl = readl(addr + Z188_CTRL_REG);
94 writel(ctl, addr + Z188_CTRL_REG);
96 for (i = 0; i < Z188_ADC_MAX_CHAN; i++) {
97 cfg = readl(addr + i);
98 cfg &= ~Z188_ADC_GAIN;
99 cfg |= Z188_MODE_VOLTAGE;
100 writel(cfg, addr + i);
104 static int men_z188_probe(struct mcb_device *dev,
105 const struct mcb_device_id *id)
107 struct z188_adc *adc;
108 struct iio_dev *indio_dev;
109 struct resource *mem;
111 indio_dev = devm_iio_device_alloc(&dev->dev, sizeof(struct z188_adc));
115 adc = iio_priv(indio_dev);
116 indio_dev->name = "z188-adc";
117 indio_dev->dev.parent = &dev->dev;
118 indio_dev->info = &z188_adc_info;
119 indio_dev->modes = INDIO_DIRECT_MODE;
120 indio_dev->channels = z188_adc_iio_channels;
121 indio_dev->num_channels = ARRAY_SIZE(z188_adc_iio_channels);
123 mem = mcb_request_mem(dev, "z188-adc");
127 adc->base = ioremap(mem->start, resource_size(mem));
128 if (adc->base == NULL)
131 men_z188_config_channels(adc->base);
134 mcb_set_drvdata(dev, indio_dev);
136 return iio_device_register(indio_dev);
139 mcb_release_mem(mem);
143 static void men_z188_remove(struct mcb_device *dev)
145 struct iio_dev *indio_dev = mcb_get_drvdata(dev);
146 struct z188_adc *adc = iio_priv(indio_dev);
148 iio_device_unregister(indio_dev);
150 mcb_release_mem(adc->mem);
153 static const struct mcb_device_id men_z188_ids[] = {
156 MODULE_DEVICE_TABLE(mcb, men_z188_ids);
158 static struct mcb_driver men_z188_driver = {
161 .owner = THIS_MODULE,
163 .probe = men_z188_probe,
164 .remove = men_z188_remove,
165 .id_table = men_z188_ids,
167 module_mcb_driver(men_z188_driver);
169 MODULE_AUTHOR("Johannes Thumshirn <johannes.thumshirn@men.de>");
170 MODULE_LICENSE("GPL");
171 MODULE_DESCRIPTION("IIO ADC driver for MEN 16z188 ADC Core");
172 MODULE_ALIAS("mcb:16z188");