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_shared_by_type
= BIT(IIO_CHAN_INFO_SCALE
),
59 .info_mask_separate
= BIT(IIO_CHAN_INFO_RAW
),
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");