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Rev | Author | Line No. | Line |
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420 | giacomo | 1 | /* |
2 | i2c-dev.c - i2c-bus driver, char device interface |
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3 | |||
4 | Copyright (C) 1995-97 Simon G. Vogl |
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5 | Copyright (C) 1998-99 Frodo Looijaard <frodol@dds.nl> |
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6 | Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com> |
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7 | |||
8 | This program is free software; you can redistribute it and/or modify |
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9 | it under the terms of the GNU General Public License as published by |
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10 | the Free Software Foundation; either version 2 of the License, or |
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11 | (at your option) any later version. |
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12 | |||
13 | This program is distributed in the hope that it will be useful, |
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14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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16 | GNU General Public License for more details. |
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17 | |||
18 | You should have received a copy of the GNU General Public License |
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19 | along with this program; if not, write to the Free Software |
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20 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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21 | */ |
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22 | |||
23 | /* Note that this is a complete rewrite of Simon Vogl's i2c-dev module. |
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24 | But I have used so much of his original code and ideas that it seems |
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25 | only fair to recognize him as co-author -- Frodo */ |
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26 | |||
27 | /* The I2C_RDWR ioctl code is written by Kolja Waschk <waschk@telos.de> */ |
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28 | |||
29 | /* The devfs code is contributed by Philipp Matthias Hahn |
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30 | <pmhahn@titan.lahn.de> */ |
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31 | |||
32 | /* If you want debugging uncomment: */ |
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462 | giacomo | 33 | #define DEBUG 1 |
420 | giacomo | 34 | |
458 | giacomo | 35 | #include <linuxcomp.h> |
36 | |||
420 | giacomo | 37 | #include <linux/kernel.h> |
38 | #include <linux/module.h> |
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39 | #include <linux/fs.h> |
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40 | #include <linux/slab.h> |
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41 | #include <linux/smp_lock.h> |
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42 | #include <linux/devfs_fs_kernel.h> |
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43 | #include <linux/init.h> |
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44 | #include <linux/i2c.h> |
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45 | #include <linux/i2c-dev.h> |
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46 | #include <asm/uaccess.h> |
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47 | |||
48 | static struct i2c_client i2cdev_client_template; |
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49 | |||
50 | struct i2c_dev { |
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51 | int minor; |
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52 | struct i2c_adapter *adap; |
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53 | struct class_device class_dev; |
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54 | struct completion released; /* FIXME, we need a class_device_unregister() */ |
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55 | }; |
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56 | #define to_i2c_dev(d) container_of(d, struct i2c_dev, class_dev) |
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57 | |||
58 | #define I2C_MINORS 256 |
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59 | static struct i2c_dev *i2c_dev_array[I2C_MINORS]; |
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60 | static spinlock_t i2c_dev_array_lock = SPIN_LOCK_UNLOCKED; |
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61 | |||
62 | struct i2c_dev *i2c_dev_get_by_minor(unsigned index) |
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63 | { |
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64 | struct i2c_dev *i2c_dev; |
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65 | |||
66 | spin_lock(&i2c_dev_array_lock); |
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67 | i2c_dev = i2c_dev_array[index]; |
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68 | spin_unlock(&i2c_dev_array_lock); |
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69 | return i2c_dev; |
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70 | } |
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71 | |||
72 | struct i2c_dev *i2c_dev_get_by_adapter(struct i2c_adapter *adap) |
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73 | { |
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74 | struct i2c_dev *i2c_dev = NULL; |
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75 | int i; |
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76 | |||
77 | spin_lock(&i2c_dev_array_lock); |
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78 | for (i = 0; i < I2C_MINORS; ++i) { |
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79 | if ((i2c_dev_array[i]) && |
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80 | (i2c_dev_array[i]->adap == adap)) { |
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81 | i2c_dev = i2c_dev_array[i]; |
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82 | break; |
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83 | } |
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84 | } |
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85 | spin_unlock(&i2c_dev_array_lock); |
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86 | return i2c_dev; |
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87 | } |
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88 | |||
89 | static struct i2c_dev *get_free_i2c_dev(void) |
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90 | { |
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91 | struct i2c_dev *i2c_dev; |
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92 | unsigned int i; |
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93 | |||
94 | i2c_dev = kmalloc(sizeof(*i2c_dev), GFP_KERNEL); |
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95 | if (!i2c_dev) |
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96 | return ERR_PTR(-ENOMEM); |
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97 | memset(i2c_dev, 0x00, sizeof(*i2c_dev)); |
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98 | |||
99 | spin_lock(&i2c_dev_array_lock); |
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100 | for (i = 0; i < I2C_MINORS; ++i) { |
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101 | if (i2c_dev_array[i]) |
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102 | continue; |
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103 | i2c_dev->minor = i; |
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104 | i2c_dev_array[i] = i2c_dev; |
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105 | spin_unlock(&i2c_dev_array_lock); |
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106 | return i2c_dev; |
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107 | } |
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108 | spin_unlock(&i2c_dev_array_lock); |
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109 | kfree(i2c_dev); |
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110 | return ERR_PTR(-ENODEV); |
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111 | } |
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112 | |||
113 | static void return_i2c_dev(struct i2c_dev *i2c_dev) |
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114 | { |
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115 | spin_lock(&i2c_dev_array_lock); |
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116 | i2c_dev_array[i2c_dev->minor] = NULL; |
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117 | spin_unlock(&i2c_dev_array_lock); |
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118 | } |
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119 | |||
120 | static ssize_t show_dev(struct class_device *class_dev, char *buf) |
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121 | { |
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122 | struct i2c_dev *i2c_dev = to_i2c_dev(class_dev); |
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123 | return print_dev_t(buf, MKDEV(I2C_MAJOR, i2c_dev->minor)); |
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124 | } |
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125 | static CLASS_DEVICE_ATTR(dev, S_IRUGO, show_dev, NULL); |
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126 | |||
127 | static ssize_t i2cdev_read (struct file *file, char __user *buf, size_t count, |
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128 | loff_t *offset) |
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129 | { |
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130 | char *tmp; |
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131 | int ret; |
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132 | |||
133 | struct i2c_client *client = (struct i2c_client *)file->private_data; |
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134 | |||
135 | if (count > 8192) |
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136 | count = 8192; |
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137 | |||
138 | tmp = kmalloc(count,GFP_KERNEL); |
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139 | if (tmp==NULL) |
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140 | return -ENOMEM; |
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141 | |||
142 | pr_debug("i2c-dev.o: i2c-%d reading %d bytes.\n", |
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496 | giacomo | 143 | (int)iminor(file->f_dentry->d_inode), (int)count); |
420 | giacomo | 144 | |
145 | ret = i2c_master_recv(client,tmp,count); |
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146 | if (ret >= 0) |
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147 | ret = copy_to_user(buf,tmp,count)?-EFAULT:ret; |
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148 | kfree(tmp); |
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149 | return ret; |
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150 | } |
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151 | |||
152 | static ssize_t i2cdev_write (struct file *file, const char __user *buf, size_t count, |
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153 | loff_t *offset) |
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154 | { |
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155 | int ret; |
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156 | char *tmp; |
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157 | struct i2c_client *client = (struct i2c_client *)file->private_data; |
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158 | |||
159 | if (count > 8192) |
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160 | count = 8192; |
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161 | |||
162 | tmp = kmalloc(count,GFP_KERNEL); |
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163 | if (tmp==NULL) |
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164 | return -ENOMEM; |
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165 | if (copy_from_user(tmp,buf,count)) { |
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166 | kfree(tmp); |
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167 | return -EFAULT; |
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168 | } |
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169 | |||
170 | pr_debug("i2c-dev.o: i2c-%d writing %d bytes.\n", |
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496 | giacomo | 171 | (int)iminor(file->f_dentry->d_inode), (int)count); |
420 | giacomo | 172 | |
173 | ret = i2c_master_send(client,tmp,count); |
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174 | kfree(tmp); |
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175 | return ret; |
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176 | } |
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177 | |||
178 | int i2cdev_ioctl (struct inode *inode, struct file *file, unsigned int cmd, |
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179 | unsigned long arg) |
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180 | { |
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181 | struct i2c_client *client = (struct i2c_client *)file->private_data; |
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182 | struct i2c_rdwr_ioctl_data rdwr_arg; |
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183 | struct i2c_smbus_ioctl_data data_arg; |
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184 | union i2c_smbus_data temp; |
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185 | struct i2c_msg *rdwr_pa; |
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186 | u8 **data_ptrs; |
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187 | int i,datasize,res; |
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188 | unsigned long funcs; |
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189 | |||
190 | dev_dbg(&client->dev, "i2c-%d ioctl, cmd: 0x%x, arg: %lx.\n", |
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191 | iminor(inode),cmd, arg); |
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192 | |||
193 | switch ( cmd ) { |
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194 | case I2C_SLAVE: |
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195 | case I2C_SLAVE_FORCE: |
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196 | if ((arg > 0x3ff) || |
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197 | (((client->flags & I2C_M_TEN) == 0) && arg > 0x7f)) |
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198 | return -EINVAL; |
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199 | if ((cmd == I2C_SLAVE) && i2c_check_addr(client->adapter,arg)) |
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200 | return -EBUSY; |
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201 | client->addr = arg; |
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202 | return 0; |
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203 | case I2C_TENBIT: |
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204 | if (arg) |
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205 | client->flags |= I2C_M_TEN; |
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206 | else |
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207 | client->flags &= ~I2C_M_TEN; |
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208 | return 0; |
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209 | case I2C_PEC: |
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210 | if (arg) |
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211 | client->flags |= I2C_CLIENT_PEC; |
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212 | else |
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213 | client->flags &= ~I2C_CLIENT_PEC; |
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214 | return 0; |
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215 | case I2C_FUNCS: |
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216 | funcs = i2c_get_functionality(client->adapter); |
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217 | return (copy_to_user((unsigned long __user *)arg, &funcs, |
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218 | sizeof(unsigned long)))?-EFAULT:0; |
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219 | |||
220 | case I2C_RDWR: |
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221 | if (copy_from_user(&rdwr_arg, |
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222 | (struct i2c_rdwr_ioctl_data __user *)arg, |
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223 | sizeof(rdwr_arg))) |
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224 | return -EFAULT; |
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225 | |||
226 | /* Put an arbritrary limit on the number of messages that can |
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227 | * be sent at once */ |
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228 | if (rdwr_arg.nmsgs > 42) |
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229 | return -EINVAL; |
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230 | |||
231 | rdwr_pa = (struct i2c_msg *) |
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232 | kmalloc(rdwr_arg.nmsgs * sizeof(struct i2c_msg), |
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233 | GFP_KERNEL); |
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234 | |||
235 | if (rdwr_pa == NULL) return -ENOMEM; |
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236 | |||
237 | if (copy_from_user(rdwr_pa, rdwr_arg.msgs, |
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238 | rdwr_arg.nmsgs * sizeof(struct i2c_msg))) { |
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239 | kfree(rdwr_pa); |
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240 | return -EFAULT; |
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241 | } |
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242 | |||
243 | data_ptrs = (u8 **) kmalloc(rdwr_arg.nmsgs * sizeof(u8 *), |
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244 | GFP_KERNEL); |
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245 | if (data_ptrs == NULL) { |
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246 | kfree(rdwr_pa); |
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247 | return -ENOMEM; |
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248 | } |
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249 | |||
250 | res = 0; |
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251 | for( i=0; i<rdwr_arg.nmsgs; i++ ) { |
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252 | /* Limit the size of the message to a sane amount */ |
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253 | if (rdwr_pa[i].len > 8192) { |
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254 | res = -EINVAL; |
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255 | break; |
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256 | } |
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257 | data_ptrs[i] = rdwr_pa[i].buf; |
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258 | rdwr_pa[i].buf = kmalloc(rdwr_pa[i].len, GFP_KERNEL); |
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259 | if(rdwr_pa[i].buf == NULL) { |
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260 | res = -ENOMEM; |
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261 | break; |
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262 | } |
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263 | if(copy_from_user(rdwr_pa[i].buf, |
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264 | data_ptrs[i], |
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265 | rdwr_pa[i].len)) { |
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266 | ++i; /* Needs to be kfreed too */ |
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267 | res = -EFAULT; |
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268 | break; |
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269 | } |
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270 | } |
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271 | if (res < 0) { |
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272 | int j; |
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273 | for (j = 0; j < i; ++j) |
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274 | kfree(rdwr_pa[j].buf); |
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275 | kfree(data_ptrs); |
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276 | kfree(rdwr_pa); |
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277 | return res; |
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278 | } |
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279 | |||
280 | res = i2c_transfer(client->adapter, |
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281 | rdwr_pa, |
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282 | rdwr_arg.nmsgs); |
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283 | while(i-- > 0) { |
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284 | if( res>=0 && (rdwr_pa[i].flags & I2C_M_RD)) { |
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285 | if(copy_to_user( |
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286 | data_ptrs[i], |
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287 | rdwr_pa[i].buf, |
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288 | rdwr_pa[i].len)) { |
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289 | res = -EFAULT; |
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290 | } |
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291 | } |
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292 | kfree(rdwr_pa[i].buf); |
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293 | } |
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294 | kfree(data_ptrs); |
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295 | kfree(rdwr_pa); |
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296 | return res; |
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297 | |||
298 | case I2C_SMBUS: |
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299 | if (copy_from_user(&data_arg, |
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300 | (struct i2c_smbus_ioctl_data __user *) arg, |
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301 | sizeof(struct i2c_smbus_ioctl_data))) |
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302 | return -EFAULT; |
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303 | if ((data_arg.size != I2C_SMBUS_BYTE) && |
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304 | (data_arg.size != I2C_SMBUS_QUICK) && |
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305 | (data_arg.size != I2C_SMBUS_BYTE_DATA) && |
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306 | (data_arg.size != I2C_SMBUS_WORD_DATA) && |
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307 | (data_arg.size != I2C_SMBUS_PROC_CALL) && |
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308 | (data_arg.size != I2C_SMBUS_BLOCK_DATA) && |
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309 | (data_arg.size != I2C_SMBUS_I2C_BLOCK_DATA) && |
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310 | (data_arg.size != I2C_SMBUS_BLOCK_PROC_CALL)) { |
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311 | dev_dbg(&client->dev, |
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312 | "size out of range (%x) in ioctl I2C_SMBUS.\n", |
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313 | data_arg.size); |
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314 | return -EINVAL; |
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315 | } |
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316 | /* Note that I2C_SMBUS_READ and I2C_SMBUS_WRITE are 0 and 1, |
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317 | so the check is valid if size==I2C_SMBUS_QUICK too. */ |
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318 | if ((data_arg.read_write != I2C_SMBUS_READ) && |
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319 | (data_arg.read_write != I2C_SMBUS_WRITE)) { |
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320 | dev_dbg(&client->dev, |
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321 | "read_write out of range (%x) in ioctl I2C_SMBUS.\n", |
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322 | data_arg.read_write); |
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323 | return -EINVAL; |
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324 | } |
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325 | |||
326 | /* Note that command values are always valid! */ |
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327 | |||
328 | if ((data_arg.size == I2C_SMBUS_QUICK) || |
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329 | ((data_arg.size == I2C_SMBUS_BYTE) && |
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330 | (data_arg.read_write == I2C_SMBUS_WRITE))) |
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331 | /* These are special: we do not use data */ |
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332 | return i2c_smbus_xfer(client->adapter, client->addr, |
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333 | client->flags, |
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334 | data_arg.read_write, |
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335 | data_arg.command, |
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336 | data_arg.size, NULL); |
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337 | |||
338 | if (data_arg.data == NULL) { |
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339 | dev_dbg(&client->dev, |
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340 | "data is NULL pointer in ioctl I2C_SMBUS.\n"); |
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341 | return -EINVAL; |
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342 | } |
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343 | |||
344 | if ((data_arg.size == I2C_SMBUS_BYTE_DATA) || |
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345 | (data_arg.size == I2C_SMBUS_BYTE)) |
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346 | datasize = sizeof(data_arg.data->byte); |
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347 | else if ((data_arg.size == I2C_SMBUS_WORD_DATA) || |
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348 | (data_arg.size == I2C_SMBUS_PROC_CALL)) |
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349 | datasize = sizeof(data_arg.data->word); |
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350 | else /* size == smbus block, i2c block, or block proc. call */ |
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351 | datasize = sizeof(data_arg.data->block); |
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352 | |||
353 | if ((data_arg.size == I2C_SMBUS_PROC_CALL) || |
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354 | (data_arg.size == I2C_SMBUS_BLOCK_PROC_CALL) || |
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355 | (data_arg.read_write == I2C_SMBUS_WRITE)) { |
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356 | if (copy_from_user(&temp, data_arg.data, datasize)) |
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357 | return -EFAULT; |
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358 | } |
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359 | res = i2c_smbus_xfer(client->adapter,client->addr,client->flags, |
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360 | data_arg.read_write, |
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361 | data_arg.command,data_arg.size,&temp); |
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362 | if (! res && ((data_arg.size == I2C_SMBUS_PROC_CALL) || |
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363 | (data_arg.size == I2C_SMBUS_BLOCK_PROC_CALL) || |
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364 | (data_arg.read_write == I2C_SMBUS_READ))) { |
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365 | if (copy_to_user(data_arg.data, &temp, datasize)) |
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366 | return -EFAULT; |
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367 | } |
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368 | return res; |
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369 | |||
370 | default: |
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371 | return i2c_control(client,cmd,arg); |
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372 | } |
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373 | return 0; |
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374 | } |
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375 | |||
376 | static int i2cdev_open(struct inode *inode, struct file *file) |
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377 | { |
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378 | unsigned int minor = iminor(inode); |
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379 | struct i2c_client *client; |
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380 | struct i2c_adapter *adap; |
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381 | struct i2c_dev *i2c_dev; |
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382 | |||
383 | i2c_dev = i2c_dev_get_by_minor(minor); |
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384 | if (!i2c_dev) |
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385 | return -ENODEV; |
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386 | |||
387 | adap = i2c_get_adapter(i2c_dev->adap->nr); |
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388 | if (!adap) |
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389 | return -ENODEV; |
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390 | |||
391 | client = kmalloc(sizeof(*client), GFP_KERNEL); |
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392 | if (!client) { |
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393 | i2c_put_adapter(adap); |
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394 | return -ENOMEM; |
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395 | } |
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396 | memcpy(client, &i2cdev_client_template, sizeof(*client)); |
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397 | |||
398 | /* registered with adapter, passed as client to user */ |
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399 | client->adapter = adap; |
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400 | file->private_data = client; |
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401 | |||
402 | return 0; |
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403 | } |
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404 | |||
405 | static int i2cdev_release(struct inode *inode, struct file *file) |
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406 | { |
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407 | struct i2c_client *client = file->private_data; |
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408 | |||
409 | i2c_put_adapter(client->adapter); |
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410 | kfree(client); |
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411 | file->private_data = NULL; |
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412 | |||
413 | return 0; |
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414 | } |
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415 | |||
416 | static struct file_operations i2cdev_fops = { |
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417 | .owner = THIS_MODULE, |
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462 | giacomo | 418 | .llseek = NULL,//no_llseek, |
420 | giacomo | 419 | .read = i2cdev_read, |
420 | .write = i2cdev_write, |
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421 | .ioctl = i2cdev_ioctl, |
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422 | .open = i2cdev_open, |
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423 | .release = i2cdev_release, |
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424 | }; |
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425 | |||
426 | static void release_i2c_dev(struct class_device *dev) |
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427 | { |
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428 | struct i2c_dev *i2c_dev = to_i2c_dev(dev); |
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847 | giacomo | 429 | //complete(&i2c_dev->released); |
420 | giacomo | 430 | } |
431 | |||
432 | static struct class i2c_dev_class = { |
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433 | .name = "i2c-dev", |
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434 | .release = &release_i2c_dev, |
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435 | }; |
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436 | |||
437 | static int i2cdev_attach_adapter(struct i2c_adapter *adap) |
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438 | { |
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439 | struct i2c_dev *i2c_dev; |
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440 | int retval; |
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441 | |||
442 | i2c_dev = get_free_i2c_dev(); |
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443 | if (IS_ERR(i2c_dev)) |
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444 | return PTR_ERR(i2c_dev); |
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445 | |||
446 | devfs_mk_cdev(MKDEV(I2C_MAJOR, i2c_dev->minor), |
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447 | S_IFCHR|S_IRUSR|S_IWUSR, "i2c/%d", i2c_dev->minor); |
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448 | dev_dbg(&adap->dev, "Registered as minor %d\n", i2c_dev->minor); |
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449 | |||
450 | /* register this i2c device with the driver core */ |
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451 | i2c_dev->adap = adap; |
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452 | if (adap->dev.parent == &legacy_bus) |
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453 | i2c_dev->class_dev.dev = &adap->dev; |
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454 | else |
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455 | i2c_dev->class_dev.dev = adap->dev.parent; |
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456 | i2c_dev->class_dev.class = &i2c_dev_class; |
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458 | giacomo | 457 | snprintf26(i2c_dev->class_dev.class_id, BUS_ID_SIZE, "i2c-%d", i2c_dev->minor); |
420 | giacomo | 458 | retval = class_device_register(&i2c_dev->class_dev); |
459 | if (retval) |
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460 | goto error; |
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461 | class_device_create_file(&i2c_dev->class_dev, &class_device_attr_dev); |
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462 | return 0; |
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463 | error: |
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464 | return_i2c_dev(i2c_dev); |
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465 | kfree(i2c_dev); |
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466 | return retval; |
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467 | } |
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468 | |||
469 | static int i2cdev_detach_adapter(struct i2c_adapter *adap) |
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470 | { |
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471 | struct i2c_dev *i2c_dev; |
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472 | |||
473 | i2c_dev = i2c_dev_get_by_adapter(adap); |
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474 | if (!i2c_dev) |
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475 | return -ENODEV; |
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476 | |||
847 | giacomo | 477 | //init_completion(&i2c_dev->released); |
420 | giacomo | 478 | devfs_remove("i2c/%d", i2c_dev->minor); |
479 | return_i2c_dev(i2c_dev); |
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480 | class_device_unregister(&i2c_dev->class_dev); |
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847 | giacomo | 481 | //wait_for_completion(&i2c_dev->released); |
420 | giacomo | 482 | kfree(i2c_dev); |
483 | |||
484 | dev_dbg(&adap->dev, "Adapter unregistered\n"); |
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485 | return 0; |
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486 | } |
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487 | |||
488 | static int i2cdev_detach_client(struct i2c_client *client) |
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489 | { |
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490 | return 0; |
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491 | } |
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492 | |||
493 | static int i2cdev_command(struct i2c_client *client, unsigned int cmd, |
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494 | void *arg) |
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495 | { |
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496 | return -1; |
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497 | } |
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498 | |||
499 | static struct i2c_driver i2cdev_driver = { |
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500 | .owner = THIS_MODULE, |
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501 | .name = "dev_driver", |
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502 | .id = I2C_DRIVERID_I2CDEV, |
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503 | .flags = I2C_DF_NOTIFY, |
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504 | .attach_adapter = i2cdev_attach_adapter, |
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505 | .detach_adapter = i2cdev_detach_adapter, |
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506 | .detach_client = i2cdev_detach_client, |
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507 | .command = i2cdev_command, |
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508 | }; |
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509 | |||
510 | static struct i2c_client i2cdev_client_template = { |
||
511 | .name = "I2C /dev entry", |
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512 | .id = 1, |
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513 | .addr = -1, |
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514 | .driver = &i2cdev_driver, |
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515 | }; |
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516 | |||
458 | giacomo | 517 | int __init i2c_dev_init(void) |
420 | giacomo | 518 | { |
519 | int res; |
||
520 | |||
521 | printk(KERN_INFO "i2c /dev entries driver\n"); |
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522 | |||
523 | if (register_chrdev(I2C_MAJOR,"i2c",&i2cdev_fops)) { |
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524 | printk(KERN_ERR "i2c-dev.o: unable to get major %d for i2c bus\n", |
||
525 | I2C_MAJOR); |
||
526 | return -EIO; |
||
527 | } |
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528 | devfs_mk_dir("i2c"); |
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529 | class_register(&i2c_dev_class); |
||
530 | if ((res = i2c_add_driver(&i2cdev_driver))) { |
||
531 | printk(KERN_ERR "i2c-dev.o: Driver registration failed, module not inserted.\n"); |
||
532 | devfs_remove("i2c"); |
||
533 | unregister_chrdev(I2C_MAJOR,"i2c"); |
||
534 | return res; |
||
535 | } |
||
536 | return 0; |
||
537 | } |
||
538 | |||
539 | static void __exit i2c_dev_exit(void) |
||
540 | { |
||
541 | i2c_del_driver(&i2cdev_driver); |
||
542 | class_unregister(&i2c_dev_class); |
||
543 | devfs_remove("i2c"); |
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544 | unregister_chrdev(I2C_MAJOR,"i2c"); |
||
545 | } |
||
546 | |||
547 | MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and " |
||
548 | "Simon G. Vogl <simon@tk.uni-linz.ac.at>"); |
||
549 | MODULE_DESCRIPTION("I2C /dev entries driver"); |
||
550 | MODULE_LICENSE("GPL"); |
||
551 | |||
552 | module_init(i2c_dev_init); |
||
553 | module_exit(i2c_dev_exit); |