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Linux/drivers/iio/adc/ti-adc081c.c

  1 /*
  2  * Copyright (C) 2012 Avionic Design GmbH
  3  *
  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.
  7  */
  8 
  9 #include <linux/err.h>
 10 #include <linux/i2c.h>
 11 #include <linux/module.h>
 12 #include <linux/of.h>
 13 
 14 #include <linux/iio/iio.h>
 15 #include <linux/regulator/consumer.h>
 16 
 17 struct adc081c {
 18         struct i2c_client *i2c;
 19         struct regulator *ref;
 20 };
 21 
 22 #define REG_CONV_RES 0x00
 23 
 24 static int adc081c_read_raw(struct iio_dev *iio,
 25                             struct iio_chan_spec const *channel, int *value,
 26                             int *shift, long mask)
 27 {
 28         struct adc081c *adc = iio_priv(iio);
 29         int err;
 30 
 31         switch (mask) {
 32         case IIO_CHAN_INFO_RAW:
 33                 err = i2c_smbus_read_word_swapped(adc->i2c, REG_CONV_RES);
 34                 if (err < 0)
 35                         return err;
 36 
 37                 *value = (err >> 4) & 0xff;
 38                 return IIO_VAL_INT;
 39 
 40         case IIO_CHAN_INFO_SCALE:
 41                 err = regulator_get_voltage(adc->ref);
 42                 if (err < 0)
 43                         return err;
 44 
 45                 *value = err / 1000;
 46                 *shift = 8;
 47 
 48                 return IIO_VAL_FRACTIONAL_LOG2;
 49 
 50         default:
 51                 break;
 52         }
 53 
 54         return -EINVAL;
 55 }
 56 
 57 static const struct iio_chan_spec adc081c_channel = {
 58         .type = IIO_VOLTAGE,
 59         .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
 60         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
 61 };
 62 
 63 static const struct iio_info adc081c_info = {
 64         .read_raw = adc081c_read_raw,
 65         .driver_module = THIS_MODULE,
 66 };
 67 
 68 static int adc081c_probe(struct i2c_client *client,
 69                          const struct i2c_device_id *id)
 70 {
 71         struct iio_dev *iio;
 72         struct adc081c *adc;
 73         int err;
 74 
 75         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA))
 76                 return -ENODEV;
 77 
 78         iio = devm_iio_device_alloc(&client->dev, sizeof(*adc));
 79         if (!iio)
 80                 return -ENOMEM;
 81 
 82         adc = iio_priv(iio);
 83         adc->i2c = client;
 84 
 85         adc->ref = devm_regulator_get(&client->dev, "vref");
 86         if (IS_ERR(adc->ref))
 87                 return PTR_ERR(adc->ref);
 88 
 89         err = regulator_enable(adc->ref);
 90         if (err < 0)
 91                 return err;
 92 
 93         iio->dev.parent = &client->dev;
 94         iio->name = dev_name(&client->dev);
 95         iio->modes = INDIO_DIRECT_MODE;
 96         iio->info = &adc081c_info;
 97 
 98         iio->channels = &adc081c_channel;
 99         iio->num_channels = 1;
100 
101         err = iio_device_register(iio);
102         if (err < 0)
103                 goto regulator_disable;
104 
105         i2c_set_clientdata(client, iio);
106 
107         return 0;
108 
109 regulator_disable:
110         regulator_disable(adc->ref);
111 
112         return err;
113 }
114 
115 static int adc081c_remove(struct i2c_client *client)
116 {
117         struct iio_dev *iio = i2c_get_clientdata(client);
118         struct adc081c *adc = iio_priv(iio);
119 
120         iio_device_unregister(iio);
121         regulator_disable(adc->ref);
122 
123         return 0;
124 }
125 
126 static const struct i2c_device_id adc081c_id[] = {
127         { "adc081c", 0 },
128         { }
129 };
130 MODULE_DEVICE_TABLE(i2c, adc081c_id);
131 
132 #ifdef CONFIG_OF
133 static const struct of_device_id adc081c_of_match[] = {
134         { .compatible = "ti,adc081c" },
135         { }
136 };
137 MODULE_DEVICE_TABLE(of, adc081c_of_match);
138 #endif
139 
140 static struct i2c_driver adc081c_driver = {
141         .driver = {
142                 .name = "adc081c",
143                 .owner = THIS_MODULE,
144                 .of_match_table = of_match_ptr(adc081c_of_match),
145         },
146         .probe = adc081c_probe,
147         .remove = adc081c_remove,
148         .id_table = adc081c_id,
149 };
150 module_i2c_driver(adc081c_driver);
151 
152 MODULE_AUTHOR("Thierry Reding <thierry.reding@avionic-design.de>");
153 MODULE_DESCRIPTION("Texas Instruments ADC081C021/027 driver");
154 MODULE_LICENSE("GPL v2");
155 

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