1c942fddfSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later
2b87b0c0fSDmitry Eremin-Solenikov /*
3b87b0c0fSDmitry Eremin-Solenikov * m62332.c - Support for Mitsubishi m62332 DAC
4b87b0c0fSDmitry Eremin-Solenikov *
5b87b0c0fSDmitry Eremin-Solenikov * Copyright (c) 2014 Dmitry Eremin-Solenikov
6b87b0c0fSDmitry Eremin-Solenikov *
7b87b0c0fSDmitry Eremin-Solenikov * Based on max517 driver:
8b87b0c0fSDmitry Eremin-Solenikov * Copyright (C) 2010, 2011 Roland Stigge <stigge@antcom.de>
9b87b0c0fSDmitry Eremin-Solenikov */
10b87b0c0fSDmitry Eremin-Solenikov
11b87b0c0fSDmitry Eremin-Solenikov #include <linux/module.h>
12b87b0c0fSDmitry Eremin-Solenikov #include <linux/slab.h>
13b87b0c0fSDmitry Eremin-Solenikov #include <linux/i2c.h>
14b87b0c0fSDmitry Eremin-Solenikov #include <linux/err.h>
15b87b0c0fSDmitry Eremin-Solenikov
16b87b0c0fSDmitry Eremin-Solenikov #include <linux/iio/iio.h>
17b87b0c0fSDmitry Eremin-Solenikov #include <linux/iio/driver.h>
18b87b0c0fSDmitry Eremin-Solenikov
19b87b0c0fSDmitry Eremin-Solenikov #include <linux/regulator/consumer.h>
20b87b0c0fSDmitry Eremin-Solenikov
21b87b0c0fSDmitry Eremin-Solenikov #define M62332_CHANNELS 2
22b87b0c0fSDmitry Eremin-Solenikov
23b87b0c0fSDmitry Eremin-Solenikov struct m62332_data {
24b87b0c0fSDmitry Eremin-Solenikov struct i2c_client *client;
25b87b0c0fSDmitry Eremin-Solenikov struct regulator *vcc;
26b87b0c0fSDmitry Eremin-Solenikov struct mutex mutex;
27b87b0c0fSDmitry Eremin-Solenikov u8 raw[M62332_CHANNELS];
28b87b0c0fSDmitry Eremin-Solenikov u8 save[M62332_CHANNELS];
29b87b0c0fSDmitry Eremin-Solenikov };
30b87b0c0fSDmitry Eremin-Solenikov
m62332_set_value(struct iio_dev * indio_dev,u8 val,int channel)31acf2f67dSHartmut Knaack static int m62332_set_value(struct iio_dev *indio_dev, u8 val, int channel)
32b87b0c0fSDmitry Eremin-Solenikov {
33b87b0c0fSDmitry Eremin-Solenikov struct m62332_data *data = iio_priv(indio_dev);
34b87b0c0fSDmitry Eremin-Solenikov struct i2c_client *client = data->client;
35b87b0c0fSDmitry Eremin-Solenikov u8 outbuf[2];
36b87b0c0fSDmitry Eremin-Solenikov int res;
37b87b0c0fSDmitry Eremin-Solenikov
38b87b0c0fSDmitry Eremin-Solenikov if (val == data->raw[channel])
39b87b0c0fSDmitry Eremin-Solenikov return 0;
40b87b0c0fSDmitry Eremin-Solenikov
41b87b0c0fSDmitry Eremin-Solenikov outbuf[0] = channel;
42b87b0c0fSDmitry Eremin-Solenikov outbuf[1] = val;
43b87b0c0fSDmitry Eremin-Solenikov
44b87b0c0fSDmitry Eremin-Solenikov mutex_lock(&data->mutex);
45b87b0c0fSDmitry Eremin-Solenikov
46b87b0c0fSDmitry Eremin-Solenikov if (val) {
47b87b0c0fSDmitry Eremin-Solenikov res = regulator_enable(data->vcc);
48b87b0c0fSDmitry Eremin-Solenikov if (res)
49b87b0c0fSDmitry Eremin-Solenikov goto out;
50b87b0c0fSDmitry Eremin-Solenikov }
51b87b0c0fSDmitry Eremin-Solenikov
527d2da8eaSHartmut Knaack res = i2c_master_send(client, outbuf, ARRAY_SIZE(outbuf));
537d2da8eaSHartmut Knaack if (res >= 0 && res != ARRAY_SIZE(outbuf))
54b87b0c0fSDmitry Eremin-Solenikov res = -EIO;
55b87b0c0fSDmitry Eremin-Solenikov if (res < 0)
56b87b0c0fSDmitry Eremin-Solenikov goto out;
57b87b0c0fSDmitry Eremin-Solenikov
58b87b0c0fSDmitry Eremin-Solenikov data->raw[channel] = val;
59b87b0c0fSDmitry Eremin-Solenikov
60b87b0c0fSDmitry Eremin-Solenikov if (!val)
61b87b0c0fSDmitry Eremin-Solenikov regulator_disable(data->vcc);
62b87b0c0fSDmitry Eremin-Solenikov
63b87b0c0fSDmitry Eremin-Solenikov mutex_unlock(&data->mutex);
64b87b0c0fSDmitry Eremin-Solenikov
65b87b0c0fSDmitry Eremin-Solenikov return 0;
66b87b0c0fSDmitry Eremin-Solenikov
67b87b0c0fSDmitry Eremin-Solenikov out:
68b87b0c0fSDmitry Eremin-Solenikov mutex_unlock(&data->mutex);
69b87b0c0fSDmitry Eremin-Solenikov
70b87b0c0fSDmitry Eremin-Solenikov return res;
71b87b0c0fSDmitry Eremin-Solenikov }
72b87b0c0fSDmitry Eremin-Solenikov
m62332_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long mask)73b87b0c0fSDmitry Eremin-Solenikov static int m62332_read_raw(struct iio_dev *indio_dev,
74b87b0c0fSDmitry Eremin-Solenikov struct iio_chan_spec const *chan,
75b87b0c0fSDmitry Eremin-Solenikov int *val,
76b87b0c0fSDmitry Eremin-Solenikov int *val2,
77acf2f67dSHartmut Knaack long mask)
78b87b0c0fSDmitry Eremin-Solenikov {
79b87b0c0fSDmitry Eremin-Solenikov struct m62332_data *data = iio_priv(indio_dev);
8039991053SHartmut Knaack int ret;
81b87b0c0fSDmitry Eremin-Solenikov
82acf2f67dSHartmut Knaack switch (mask) {
83b87b0c0fSDmitry Eremin-Solenikov case IIO_CHAN_INFO_SCALE:
84b87b0c0fSDmitry Eremin-Solenikov /* Corresponds to Vref / 2^(bits) */
8539991053SHartmut Knaack ret = regulator_get_voltage(data->vcc);
8639991053SHartmut Knaack if (ret < 0)
8739991053SHartmut Knaack return ret;
8839991053SHartmut Knaack
8939991053SHartmut Knaack *val = ret / 1000; /* mV */
90b87b0c0fSDmitry Eremin-Solenikov *val2 = 8;
91acf2f67dSHartmut Knaack
92b87b0c0fSDmitry Eremin-Solenikov return IIO_VAL_FRACTIONAL_LOG2;
93b87b0c0fSDmitry Eremin-Solenikov case IIO_CHAN_INFO_RAW:
94b87b0c0fSDmitry Eremin-Solenikov *val = data->raw[chan->channel];
95acf2f67dSHartmut Knaack
96b87b0c0fSDmitry Eremin-Solenikov return IIO_VAL_INT;
97b87b0c0fSDmitry Eremin-Solenikov case IIO_CHAN_INFO_OFFSET:
98b87b0c0fSDmitry Eremin-Solenikov *val = 1;
99acf2f67dSHartmut Knaack
100b87b0c0fSDmitry Eremin-Solenikov return IIO_VAL_INT;
101b87b0c0fSDmitry Eremin-Solenikov default:
102b87b0c0fSDmitry Eremin-Solenikov break;
103b87b0c0fSDmitry Eremin-Solenikov }
104acf2f67dSHartmut Knaack
105b87b0c0fSDmitry Eremin-Solenikov return -EINVAL;
106b87b0c0fSDmitry Eremin-Solenikov }
107b87b0c0fSDmitry Eremin-Solenikov
m62332_write_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int val,int val2,long mask)108b87b0c0fSDmitry Eremin-Solenikov static int m62332_write_raw(struct iio_dev *indio_dev,
109acf2f67dSHartmut Knaack struct iio_chan_spec const *chan, int val, int val2,
110acf2f67dSHartmut Knaack long mask)
111b87b0c0fSDmitry Eremin-Solenikov {
112b87b0c0fSDmitry Eremin-Solenikov switch (mask) {
113b87b0c0fSDmitry Eremin-Solenikov case IIO_CHAN_INFO_RAW:
114b87b0c0fSDmitry Eremin-Solenikov if (val < 0 || val > 255)
115b87b0c0fSDmitry Eremin-Solenikov return -EINVAL;
116b87b0c0fSDmitry Eremin-Solenikov
11711687d4aSHartmut Knaack return m62332_set_value(indio_dev, val, chan->channel);
118b87b0c0fSDmitry Eremin-Solenikov default:
119b87b0c0fSDmitry Eremin-Solenikov break;
120b87b0c0fSDmitry Eremin-Solenikov }
121b87b0c0fSDmitry Eremin-Solenikov
12211687d4aSHartmut Knaack return -EINVAL;
123b87b0c0fSDmitry Eremin-Solenikov }
124b87b0c0fSDmitry Eremin-Solenikov
m62332_suspend(struct device * dev)125b87b0c0fSDmitry Eremin-Solenikov static int m62332_suspend(struct device *dev)
126b87b0c0fSDmitry Eremin-Solenikov {
127b87b0c0fSDmitry Eremin-Solenikov struct i2c_client *client = to_i2c_client(dev);
128b87b0c0fSDmitry Eremin-Solenikov struct iio_dev *indio_dev = i2c_get_clientdata(client);
129b87b0c0fSDmitry Eremin-Solenikov struct m62332_data *data = iio_priv(indio_dev);
130b87b0c0fSDmitry Eremin-Solenikov int ret;
131b87b0c0fSDmitry Eremin-Solenikov
132b87b0c0fSDmitry Eremin-Solenikov data->save[0] = data->raw[0];
133b87b0c0fSDmitry Eremin-Solenikov data->save[1] = data->raw[1];
134b87b0c0fSDmitry Eremin-Solenikov
135b87b0c0fSDmitry Eremin-Solenikov ret = m62332_set_value(indio_dev, 0, 0);
136b87b0c0fSDmitry Eremin-Solenikov if (ret < 0)
137b87b0c0fSDmitry Eremin-Solenikov return ret;
138b87b0c0fSDmitry Eremin-Solenikov
139b87b0c0fSDmitry Eremin-Solenikov return m62332_set_value(indio_dev, 0, 1);
140b87b0c0fSDmitry Eremin-Solenikov }
141b87b0c0fSDmitry Eremin-Solenikov
m62332_resume(struct device * dev)142b87b0c0fSDmitry Eremin-Solenikov static int m62332_resume(struct device *dev)
143b87b0c0fSDmitry Eremin-Solenikov {
144b87b0c0fSDmitry Eremin-Solenikov struct i2c_client *client = to_i2c_client(dev);
145b87b0c0fSDmitry Eremin-Solenikov struct iio_dev *indio_dev = i2c_get_clientdata(client);
146b87b0c0fSDmitry Eremin-Solenikov struct m62332_data *data = iio_priv(indio_dev);
147b87b0c0fSDmitry Eremin-Solenikov int ret;
148b87b0c0fSDmitry Eremin-Solenikov
149b87b0c0fSDmitry Eremin-Solenikov ret = m62332_set_value(indio_dev, data->save[0], 0);
150b87b0c0fSDmitry Eremin-Solenikov if (ret < 0)
151b87b0c0fSDmitry Eremin-Solenikov return ret;
152b87b0c0fSDmitry Eremin-Solenikov
153b87b0c0fSDmitry Eremin-Solenikov return m62332_set_value(indio_dev, data->save[1], 1);
154b87b0c0fSDmitry Eremin-Solenikov }
155b87b0c0fSDmitry Eremin-Solenikov
156671d2c60SJonathan Cameron static DEFINE_SIMPLE_DEV_PM_OPS(m62332_pm_ops, m62332_suspend, m62332_resume);
157b87b0c0fSDmitry Eremin-Solenikov
158b87b0c0fSDmitry Eremin-Solenikov static const struct iio_info m62332_info = {
159b87b0c0fSDmitry Eremin-Solenikov .read_raw = m62332_read_raw,
160b87b0c0fSDmitry Eremin-Solenikov .write_raw = m62332_write_raw,
161b87b0c0fSDmitry Eremin-Solenikov };
162b87b0c0fSDmitry Eremin-Solenikov
163b87b0c0fSDmitry Eremin-Solenikov #define M62332_CHANNEL(chan) { \
164b87b0c0fSDmitry Eremin-Solenikov .type = IIO_VOLTAGE, \
165b87b0c0fSDmitry Eremin-Solenikov .indexed = 1, \
166b87b0c0fSDmitry Eremin-Solenikov .output = 1, \
167b87b0c0fSDmitry Eremin-Solenikov .channel = (chan), \
168b87b0c0fSDmitry Eremin-Solenikov .datasheet_name = "CH" #chan, \
169862a76acSHartmut Knaack .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
170862a76acSHartmut Knaack .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
171b87b0c0fSDmitry Eremin-Solenikov BIT(IIO_CHAN_INFO_OFFSET), \
172b87b0c0fSDmitry Eremin-Solenikov }
173b87b0c0fSDmitry Eremin-Solenikov
174b87b0c0fSDmitry Eremin-Solenikov static const struct iio_chan_spec m62332_channels[M62332_CHANNELS] = {
175b87b0c0fSDmitry Eremin-Solenikov M62332_CHANNEL(0),
176b87b0c0fSDmitry Eremin-Solenikov M62332_CHANNEL(1)
177b87b0c0fSDmitry Eremin-Solenikov };
178b87b0c0fSDmitry Eremin-Solenikov
m62332_probe(struct i2c_client * client)17944d7a03cSUwe Kleine-König static int m62332_probe(struct i2c_client *client)
180b87b0c0fSDmitry Eremin-Solenikov {
181b87b0c0fSDmitry Eremin-Solenikov struct m62332_data *data;
182b87b0c0fSDmitry Eremin-Solenikov struct iio_dev *indio_dev;
183b87b0c0fSDmitry Eremin-Solenikov int ret;
184b87b0c0fSDmitry Eremin-Solenikov
185b87b0c0fSDmitry Eremin-Solenikov indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
186b87b0c0fSDmitry Eremin-Solenikov if (!indio_dev)
187b87b0c0fSDmitry Eremin-Solenikov return -ENOMEM;
188acf2f67dSHartmut Knaack
189b87b0c0fSDmitry Eremin-Solenikov data = iio_priv(indio_dev);
190b87b0c0fSDmitry Eremin-Solenikov i2c_set_clientdata(client, indio_dev);
191b87b0c0fSDmitry Eremin-Solenikov data->client = client;
192b87b0c0fSDmitry Eremin-Solenikov
193b87b0c0fSDmitry Eremin-Solenikov mutex_init(&data->mutex);
194b87b0c0fSDmitry Eremin-Solenikov
195b87b0c0fSDmitry Eremin-Solenikov data->vcc = devm_regulator_get(&client->dev, "VCC");
196b87b0c0fSDmitry Eremin-Solenikov if (IS_ERR(data->vcc))
197b87b0c0fSDmitry Eremin-Solenikov return PTR_ERR(data->vcc);
198b87b0c0fSDmitry Eremin-Solenikov
1997d2da8eaSHartmut Knaack indio_dev->num_channels = ARRAY_SIZE(m62332_channels);
200b87b0c0fSDmitry Eremin-Solenikov indio_dev->channels = m62332_channels;
201b87b0c0fSDmitry Eremin-Solenikov indio_dev->modes = INDIO_DIRECT_MODE;
202b87b0c0fSDmitry Eremin-Solenikov indio_dev->info = &m62332_info;
203b87b0c0fSDmitry Eremin-Solenikov
204b87b0c0fSDmitry Eremin-Solenikov ret = iio_map_array_register(indio_dev, client->dev.platform_data);
205b87b0c0fSDmitry Eremin-Solenikov if (ret < 0)
206b87b0c0fSDmitry Eremin-Solenikov return ret;
207b87b0c0fSDmitry Eremin-Solenikov
208b87b0c0fSDmitry Eremin-Solenikov ret = iio_device_register(indio_dev);
209b87b0c0fSDmitry Eremin-Solenikov if (ret < 0)
210b87b0c0fSDmitry Eremin-Solenikov goto err;
211b87b0c0fSDmitry Eremin-Solenikov
212b87b0c0fSDmitry Eremin-Solenikov return 0;
213b87b0c0fSDmitry Eremin-Solenikov
214b87b0c0fSDmitry Eremin-Solenikov err:
215b87b0c0fSDmitry Eremin-Solenikov iio_map_array_unregister(indio_dev);
216acf2f67dSHartmut Knaack
217b87b0c0fSDmitry Eremin-Solenikov return ret;
218b87b0c0fSDmitry Eremin-Solenikov }
219b87b0c0fSDmitry Eremin-Solenikov
m62332_remove(struct i2c_client * client)220ed5c2f5fSUwe Kleine-König static void m62332_remove(struct i2c_client *client)
221b87b0c0fSDmitry Eremin-Solenikov {
222b87b0c0fSDmitry Eremin-Solenikov struct iio_dev *indio_dev = i2c_get_clientdata(client);
223b87b0c0fSDmitry Eremin-Solenikov
224b87b0c0fSDmitry Eremin-Solenikov iio_device_unregister(indio_dev);
225b87b0c0fSDmitry Eremin-Solenikov iio_map_array_unregister(indio_dev);
226847e3928SHartmut Knaack m62332_set_value(indio_dev, 0, 0);
227847e3928SHartmut Knaack m62332_set_value(indio_dev, 0, 1);
228b87b0c0fSDmitry Eremin-Solenikov }
229b87b0c0fSDmitry Eremin-Solenikov
230b87b0c0fSDmitry Eremin-Solenikov static const struct i2c_device_id m62332_id[] = {
231b87b0c0fSDmitry Eremin-Solenikov { "m62332", },
232b87b0c0fSDmitry Eremin-Solenikov { }
233b87b0c0fSDmitry Eremin-Solenikov };
234b87b0c0fSDmitry Eremin-Solenikov MODULE_DEVICE_TABLE(i2c, m62332_id);
235b87b0c0fSDmitry Eremin-Solenikov
236b87b0c0fSDmitry Eremin-Solenikov static struct i2c_driver m62332_driver = {
237b87b0c0fSDmitry Eremin-Solenikov .driver = {
238b87b0c0fSDmitry Eremin-Solenikov .name = "m62332",
239671d2c60SJonathan Cameron .pm = pm_sleep_ptr(&m62332_pm_ops),
240b87b0c0fSDmitry Eremin-Solenikov },
241*7cf15f42SUwe Kleine-König .probe = m62332_probe,
242b87b0c0fSDmitry Eremin-Solenikov .remove = m62332_remove,
243b87b0c0fSDmitry Eremin-Solenikov .id_table = m62332_id,
244b87b0c0fSDmitry Eremin-Solenikov };
245b87b0c0fSDmitry Eremin-Solenikov module_i2c_driver(m62332_driver);
246b87b0c0fSDmitry Eremin-Solenikov
247b87b0c0fSDmitry Eremin-Solenikov MODULE_AUTHOR("Dmitry Eremin-Solenikov");
248b87b0c0fSDmitry Eremin-Solenikov MODULE_DESCRIPTION("M62332 8-bit DAC");
249b87b0c0fSDmitry Eremin-Solenikov MODULE_LICENSE("GPL v2");
250