2 * Copyright (C) 2012 Avionic Design GmbH
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
10 #include <linux/i2c.h>
11 #include <linux/module.h>
13 #include <linux/iio/iio.h>
14 #include <linux/regulator/consumer.h>
17 struct i2c_client *i2c;
18 struct regulator *ref;
21 #define REG_CONV_RES 0x00
23 static int adc081c_read_raw(struct iio_dev *iio,
24 struct iio_chan_spec const *channel, int *value,
25 int *shift, long mask)
27 struct adc081c *adc = iio_priv(iio);
31 case IIO_CHAN_INFO_RAW:
32 err = i2c_smbus_read_word_swapped(adc->i2c, REG_CONV_RES);
36 *value = (err >> 4) & 0xff;
39 case IIO_CHAN_INFO_SCALE:
40 err = regulator_get_voltage(adc->ref);
47 return IIO_VAL_FRACTIONAL_LOG2;
56 static const struct iio_chan_spec adc081c_channel = {
58 .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT |
59 IIO_CHAN_INFO_RAW_SEPARATE_BIT,
62 static const struct iio_info adc081c_info = {
63 .read_raw = adc081c_read_raw,
64 .driver_module = THIS_MODULE,
67 static int adc081c_probe(struct i2c_client *client,
68 const struct i2c_device_id *id)
74 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA))
77 iio = iio_device_alloc(sizeof(*adc));
84 adc->ref = regulator_get(&client->dev, "vref");
85 if (IS_ERR(adc->ref)) {
86 err = PTR_ERR(adc->ref);
90 err = regulator_enable(adc->ref);
94 iio->dev.parent = &client->dev;
95 iio->name = dev_name(&client->dev);
96 iio->modes = INDIO_DIRECT_MODE;
97 iio->info = &adc081c_info;
99 iio->channels = &adc081c_channel;
100 iio->num_channels = 1;
102 err = iio_device_register(iio);
104 goto regulator_disable;
106 i2c_set_clientdata(client, iio);
111 regulator_disable(adc->ref);
113 regulator_put(adc->ref);
115 iio_device_free(iio);
120 static int adc081c_remove(struct i2c_client *client)
122 struct iio_dev *iio = i2c_get_clientdata(client);
123 struct adc081c *adc = iio_priv(iio);
125 iio_device_unregister(iio);
126 regulator_disable(adc->ref);
127 regulator_put(adc->ref);
128 iio_device_free(iio);
133 static const struct i2c_device_id adc081c_id[] = {
137 MODULE_DEVICE_TABLE(i2c, adc081c_id);
140 static const struct of_device_id adc081c_of_match[] = {
141 { .compatible = "ti,adc081c" },
144 MODULE_DEVICE_TABLE(of, adc081c_of_match);
147 static struct i2c_driver adc081c_driver = {
150 .owner = THIS_MODULE,
151 .of_match_table = of_match_ptr(adc081c_of_match),
153 .probe = adc081c_probe,
154 .remove = adc081c_remove,
155 .id_table = adc081c_id,
157 module_i2c_driver(adc081c_driver);
159 MODULE_AUTHOR("Thierry Reding <thierry.reding@avionic-design.de>");
160 MODULE_DESCRIPTION("Texas Instruments ADC081C021/027 driver");
161 MODULE_LICENSE("GPL v2");