1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * m62332.c - Support for Mitsubishi m62332 DAC
5 * Copyright (c) 2014 Dmitry Eremin-Solenikov
7 * Based on max517 driver:
8 * Copyright (C) 2010, 2011 Roland Stigge <stigge@antcom.de>
11 #include <linux/module.h>
12 #include <linux/slab.h>
13 #include <linux/i2c.h>
14 #include <linux/err.h>
16 #include <linux/iio/iio.h>
17 #include <linux/iio/driver.h>
19 #include <linux/regulator/consumer.h>
21 #define M62332_CHANNELS 2
24 struct i2c_client *client;
25 struct regulator *vcc;
27 u8 raw[M62332_CHANNELS];
28 u8 save[M62332_CHANNELS];
31 static int m62332_set_value(struct iio_dev *indio_dev, u8 val, int channel)
33 struct m62332_data *data = iio_priv(indio_dev);
34 struct i2c_client *client = data->client;
38 if (val == data->raw[channel])
44 mutex_lock(&data->mutex);
47 res = regulator_enable(data->vcc);
52 res = i2c_master_send(client, outbuf, ARRAY_SIZE(outbuf));
53 if (res >= 0 && res != ARRAY_SIZE(outbuf))
58 data->raw[channel] = val;
61 regulator_disable(data->vcc);
63 mutex_unlock(&data->mutex);
68 mutex_unlock(&data->mutex);
73 static int m62332_read_raw(struct iio_dev *indio_dev,
74 struct iio_chan_spec const *chan,
79 struct m62332_data *data = iio_priv(indio_dev);
83 case IIO_CHAN_INFO_SCALE:
84 /* Corresponds to Vref / 2^(bits) */
85 ret = regulator_get_voltage(data->vcc);
89 *val = ret / 1000; /* mV */
92 return IIO_VAL_FRACTIONAL_LOG2;
93 case IIO_CHAN_INFO_RAW:
94 *val = data->raw[chan->channel];
97 case IIO_CHAN_INFO_OFFSET:
108 static int m62332_write_raw(struct iio_dev *indio_dev,
109 struct iio_chan_spec const *chan, int val, int val2,
113 case IIO_CHAN_INFO_RAW:
114 if (val < 0 || val > 255)
117 return m62332_set_value(indio_dev, val, chan->channel);
125 static int m62332_suspend(struct device *dev)
127 struct i2c_client *client = to_i2c_client(dev);
128 struct iio_dev *indio_dev = i2c_get_clientdata(client);
129 struct m62332_data *data = iio_priv(indio_dev);
132 data->save[0] = data->raw[0];
133 data->save[1] = data->raw[1];
135 ret = m62332_set_value(indio_dev, 0, 0);
139 return m62332_set_value(indio_dev, 0, 1);
142 static int m62332_resume(struct device *dev)
144 struct i2c_client *client = to_i2c_client(dev);
145 struct iio_dev *indio_dev = i2c_get_clientdata(client);
146 struct m62332_data *data = iio_priv(indio_dev);
149 ret = m62332_set_value(indio_dev, data->save[0], 0);
153 return m62332_set_value(indio_dev, data->save[1], 1);
156 static DEFINE_SIMPLE_DEV_PM_OPS(m62332_pm_ops, m62332_suspend, m62332_resume);
158 static const struct iio_info m62332_info = {
159 .read_raw = m62332_read_raw,
160 .write_raw = m62332_write_raw,
163 #define M62332_CHANNEL(chan) { \
164 .type = IIO_VOLTAGE, \
168 .datasheet_name = "CH" #chan, \
169 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
170 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
171 BIT(IIO_CHAN_INFO_OFFSET), \
174 static const struct iio_chan_spec m62332_channels[M62332_CHANNELS] = {
179 static int m62332_probe(struct i2c_client *client)
181 struct m62332_data *data;
182 struct iio_dev *indio_dev;
185 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
189 data = iio_priv(indio_dev);
190 i2c_set_clientdata(client, indio_dev);
191 data->client = client;
193 mutex_init(&data->mutex);
195 data->vcc = devm_regulator_get(&client->dev, "VCC");
196 if (IS_ERR(data->vcc))
197 return PTR_ERR(data->vcc);
199 indio_dev->num_channels = ARRAY_SIZE(m62332_channels);
200 indio_dev->channels = m62332_channels;
201 indio_dev->modes = INDIO_DIRECT_MODE;
202 indio_dev->info = &m62332_info;
204 ret = iio_map_array_register(indio_dev, client->dev.platform_data);
208 ret = iio_device_register(indio_dev);
215 iio_map_array_unregister(indio_dev);
220 static void m62332_remove(struct i2c_client *client)
222 struct iio_dev *indio_dev = i2c_get_clientdata(client);
224 iio_device_unregister(indio_dev);
225 iio_map_array_unregister(indio_dev);
226 m62332_set_value(indio_dev, 0, 0);
227 m62332_set_value(indio_dev, 0, 1);
230 static const struct i2c_device_id m62332_id[] = {
234 MODULE_DEVICE_TABLE(i2c, m62332_id);
236 static struct i2c_driver m62332_driver = {
239 .pm = pm_sleep_ptr(&m62332_pm_ops),
241 .probe = m62332_probe,
242 .remove = m62332_remove,
243 .id_table = m62332_id,
245 module_i2c_driver(m62332_driver);
247 MODULE_AUTHOR("Dmitry Eremin-Solenikov");
248 MODULE_DESCRIPTION("M62332 8-bit DAC");
249 MODULE_LICENSE("GPL v2");