drivers/staging/iio/meter/ade7854-i2c.c

   1 /*
   2  * ADE7854/58/68/78 Polyphase Multifunction Energy Metering IC Driver (I2C Bus)
   3  *
   4  * Copyright 2010 Analog Devices Inc.
   5  *
   6  * Licensed under the GPL-2 or later.
   7  */
   8
   9 #include <linux/device.h>
  10 #include <linux/kernel.h>
  11 #include <linux/i2c.h>
  12 #include <linux/slab.h>
  13 #include <linux/module.h>
  14
  15 #include "../iio.h"
  16 #include "ade7854.h"
  17
  18 static int ade7854_i2c_write_reg_8(struct device *dev,
  19                 u16 reg_address,
  20                 u8 value)
  21 {
  22         int ret;
  23         struct iio_dev *indio_dev = dev_get_drvdata(dev);
  24         struct ade7854_state *st = iio_priv(indio_dev);
  25
  26         mutex_lock(&st->buf_lock);
  27         st->tx[0] = (reg_address >> 8) & 0xFF;
  28         st->tx[1] = reg_address & 0xFF;
  29         st->tx[2] = value;
  30
  31         ret = i2c_master_send(st->i2c, st->tx, 3);
  32         mutex_unlock(&st->buf_lock);
  33
  34         return ret;
  35 }
  36
  37 static int ade7854_i2c_write_reg_16(struct device *dev,
  38                 u16 reg_address,
  39                 u16 value)
  40 {
  41         int ret;
  42         struct iio_dev *indio_dev = dev_get_drvdata(dev);
  43         struct ade7854_state *st = iio_priv(indio_dev);
  44
  45         mutex_lock(&st->buf_lock);
  46         st->tx[0] = (reg_address >> 8) & 0xFF;
  47         st->tx[1] = reg_address & 0xFF;
  48         st->tx[2] = (value >> 8) & 0xFF;
  49         st->tx[3] = value & 0xFF;
  50
  51         ret = i2c_master_send(st->i2c, st->tx, 4);
  52         mutex_unlock(&st->buf_lock);
  53
  54         return ret;
  55 }
  56
  57 static int ade7854_i2c_write_reg_24(struct device *dev,
  58                 u16 reg_address,
  59                 u32 value)
  60 {
  61         int ret;
  62         struct iio_dev *indio_dev = dev_get_drvdata(dev);
  63         struct ade7854_state *st = iio_priv(indio_dev);
  64
  65         mutex_lock(&st->buf_lock);
  66         st->tx[0] = (reg_address >> 8) & 0xFF;
  67         st->tx[1] = reg_address & 0xFF;
  68         st->tx[2] = (value >> 16) & 0xFF;
  69         st->tx[3] = (value >> 8) & 0xFF;
  70         st->tx[4] = value & 0xFF;
  71
  72         ret = i2c_master_send(st->i2c, st->tx, 5);
  73         mutex_unlock(&st->buf_lock);
  74
  75         return ret;
  76 }
  77
  78 static int ade7854_i2c_write_reg_32(struct device *dev,
  79                 u16 reg_address,
  80                 u32 value)
  81 {
  82         int ret;
  83         struct iio_dev *indio_dev = dev_get_drvdata(dev);
  84         struct ade7854_state *st = iio_priv(indio_dev);
  85
  86         mutex_lock(&st->buf_lock);
  87         st->tx[0] = (reg_address >> 8) & 0xFF;
  88         st->tx[1] = reg_address & 0xFF;
  89         st->tx[2] = (value >> 24) & 0xFF;
  90         st->tx[3] = (value >> 16) & 0xFF;
  91         st->tx[4] = (value >> 8) & 0xFF;
  92         st->tx[5] = value & 0xFF;
  93
  94         ret = i2c_master_send(st->i2c, st->tx, 6);
  95         mutex_unlock(&st->buf_lock);
  96
  97         return ret;
  98 }
  99
 100 static int ade7854_i2c_read_reg_8(struct device *dev,
 101                 u16 reg_address,
 102                 u8 *val)
 103 {
 104         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 105         struct ade7854_state *st = iio_priv(indio_dev);
 106         int ret;
 107
 108         mutex_lock(&st->buf_lock);
 109         st->tx[0] = (reg_address >> 8) & 0xFF;
 110         st->tx[1] = reg_address & 0xFF;
 111
 112         ret = i2c_master_send(st->i2c, st->tx, 2);
 113         if (ret)
 114                 goto out;
 115
 116         ret = i2c_master_recv(st->i2c, st->rx, 1);
 117         if (ret)
 118                 goto out;
 119
 120         *val = st->rx[0];
 121 out:
 122         mutex_unlock(&st->buf_lock);
 123         return ret;
 124 }
 125
 126 static int ade7854_i2c_read_reg_16(struct device *dev,
 127                 u16 reg_address,
 128                 u16 *val)
 129 {
 130         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 131         struct ade7854_state *st = iio_priv(indio_dev);
 132         int ret;
 133
 134         mutex_lock(&st->buf_lock);
 135         st->tx[0] = (reg_address >> 8) & 0xFF;
 136         st->tx[1] = reg_address & 0xFF;
 137
 138         ret = i2c_master_send(st->i2c, st->tx, 2);
 139         if (ret)
 140                 goto out;
 141
 142         ret = i2c_master_recv(st->i2c, st->rx, 2);
 143         if (ret)
 144                 goto out;
 145
 146         *val = (st->rx[0] << 8) | st->rx[1];
 147 out:
 148         mutex_unlock(&st->buf_lock);
 149         return ret;
 150 }
 151
 152 static int ade7854_i2c_read_reg_24(struct device *dev,
 153                 u16 reg_address,
 154                 u32 *val)
 155 {
 156         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 157         struct ade7854_state *st = iio_priv(indio_dev);
 158         int ret;
 159
 160         mutex_lock(&st->buf_lock);
 161         st->tx[0] = (reg_address >> 8) & 0xFF;
 162         st->tx[1] = reg_address & 0xFF;
 163
 164         ret = i2c_master_send(st->i2c, st->tx, 2);
 165         if (ret)
 166                 goto out;
 167
 168         ret = i2c_master_recv(st->i2c, st->rx, 3);
 169         if (ret)
 170                 goto out;
 171
 172         *val = (st->rx[0] << 16) | (st->rx[1] << 8) | st->rx[2];
 173 out:
 174         mutex_unlock(&st->buf_lock);
 175         return ret;
 176 }
 177
 178 static int ade7854_i2c_read_reg_32(struct device *dev,
 179                 u16 reg_address,
 180                 u32 *val)
 181 {
 182         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 183         struct ade7854_state *st = iio_priv(indio_dev);
 184         int ret;
 185
 186         mutex_lock(&st->buf_lock);
 187         st->tx[0] = (reg_address >> 8) & 0xFF;
 188         st->tx[1] = reg_address & 0xFF;
 189
 190         ret = i2c_master_send(st->i2c, st->tx, 2);
 191         if (ret)
 192                 goto out;
 193
 194         ret = i2c_master_recv(st->i2c, st->rx, 3);
 195         if (ret)
 196                 goto out;
 197
 198         *val = (st->rx[0] << 24) | (st->rx[1] << 16) | (st->rx[2] << 8) | st->rx[3];
 199 out:
 200         mutex_unlock(&st->buf_lock);
 201         return ret;
 202 }
 203
 204 static int __devinit ade7854_i2c_probe(struct i2c_client *client,
 205                 const struct i2c_device_id *id)
 206 {
 207         int ret;
 208         struct ade7854_state *st;
 209         struct iio_dev *indio_dev;
 210
 211         indio_dev = iio_allocate_device(sizeof(*st));
 212         if (indio_dev == NULL)
 213                 return -ENOMEM;
 214         st = iio_priv(indio_dev);
 215         i2c_set_clientdata(client, indio_dev);
 216         st->read_reg_8 = ade7854_i2c_read_reg_8;
 217         st->read_reg_16 = ade7854_i2c_read_reg_16;
 218         st->read_reg_24 = ade7854_i2c_read_reg_24;
 219         st->read_reg_32 = ade7854_i2c_read_reg_32;
 220         st->write_reg_8 = ade7854_i2c_write_reg_8;
 221         st->write_reg_16 = ade7854_i2c_write_reg_16;
 222         st->write_reg_24 = ade7854_i2c_write_reg_24;
 223         st->write_reg_32 = ade7854_i2c_write_reg_32;
 224         st->i2c = client;
 225         st->irq = client->irq;
 226
 227         ret = ade7854_probe(indio_dev, &client->dev);
 228         if (ret)
 229                 iio_free_device(indio_dev);
 230
 231         return ret;
 232 }
 233
 234 static int __devexit ade7854_i2c_remove(struct i2c_client *client)
 235 {
 236         return ade7854_remove(i2c_get_clientdata(client));
 237 }
 238
 239 static const struct i2c_device_id ade7854_id[] = {
 240         { "ade7854", 0 },
 241         { "ade7858", 0 },
 242         { "ade7868", 0 },
 243         { "ade7878", 0 },
 244         { }
 245 };
 246 MODULE_DEVICE_TABLE(i2c, ade7854_id);
 247
 248 static struct i2c_driver ade7854_i2c_driver = {
 249         .driver = {
 250                 .name = "ade7854",
 251         },
 252         .probe    = ade7854_i2c_probe,
 253         .remove   = __devexit_p(ade7854_i2c_remove),
 254         .id_table = ade7854_id,
 255 };
 256 module_i2c_driver(ade7854_i2c_driver);
 257
 258 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
 259 MODULE_DESCRIPTION("Analog Devices ADE7854/58/68/78 Polyphase Multifunction Energy Metering IC I2C Driver");
 260 MODULE_LICENSE("GPL v2");