2019-05-27 06:55:06 +00:00
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// SPDX-License-Identifier: GPL-2.0-or-later
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2005-04-16 22:20:36 +00:00
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/*
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2006-12-10 20:21:31 +00:00
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i2c-dev.c - i2c-bus driver, char device interface
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2005-04-16 22:20:36 +00:00
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Copyright (C) 1995-97 Simon G. Vogl
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Copyright (C) 1998-99 Frodo Looijaard <frodol@dds.nl>
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Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
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*/
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/* Note that this is a complete rewrite of Simon Vogl's i2c-dev module.
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But I have used so much of his original code and ideas that it seems
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only fair to recognize him as co-author -- Frodo */
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/* The I2C_RDWR ioctl code is written by Kolja Waschk <waschk@telos.de> */
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2016-05-03 18:45:43 +00:00
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#include <linux/cdev.h>
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2020-01-30 20:23:12 +00:00
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#include <linux/compat.h>
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2011-03-20 13:50:52 +00:00
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#include <linux/device.h>
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2005-04-16 22:20:36 +00:00
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#include <linux/fs.h>
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#include <linux/i2c-dev.h>
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2016-02-20 22:33:38 +00:00
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#include <linux/i2c.h>
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#include <linux/init.h>
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2009-02-24 18:19:49 +00:00
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#include <linux/jiffies.h>
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2016-02-20 22:33:38 +00:00
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/notifier.h>
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#include <linux/slab.h>
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2010-05-21 16:40:59 +00:00
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#include <linux/uaccess.h>
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2005-04-16 22:20:36 +00:00
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2007-11-15 18:24:01 +00:00
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/*
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* An i2c_dev represents an i2c_adapter ... an I2C or SMBus master, not a
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* slave (i2c_client) with which messages will be exchanged. It's coupled
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* with a character special file which is accessed by user mode drivers.
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*
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* The list of i2c_dev structures is parallel to the i2c_adapter lists
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2011-03-20 13:50:52 +00:00
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* maintained by the driver model, and is updated using bus notifications.
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2007-11-15 18:24:01 +00:00
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*/
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2005-04-16 22:20:36 +00:00
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struct i2c_dev {
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2006-07-01 15:17:38 +00:00
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struct list_head list;
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2005-04-16 22:20:36 +00:00
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struct i2c_adapter *adap;
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2019-10-11 15:00:14 +00:00
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struct device dev;
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2016-05-03 18:45:43 +00:00
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struct cdev cdev;
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2005-04-16 22:20:36 +00:00
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};
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2019-02-12 06:06:57 +00:00
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#define I2C_MINORS (MINORMASK + 1)
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2006-07-01 15:17:38 +00:00
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static LIST_HEAD(i2c_dev_list);
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static DEFINE_SPINLOCK(i2c_dev_list_lock);
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2005-04-16 22:20:36 +00:00
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static struct i2c_dev *i2c_dev_get_by_minor(unsigned index)
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{
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struct i2c_dev *i2c_dev;
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2006-07-01 15:17:38 +00:00
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spin_lock(&i2c_dev_list_lock);
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list_for_each_entry(i2c_dev, &i2c_dev_list, list) {
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if (i2c_dev->adap->nr == index)
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goto found;
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}
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i2c_dev = NULL;
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found:
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spin_unlock(&i2c_dev_list_lock);
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2005-04-16 22:20:36 +00:00
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return i2c_dev;
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}
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static struct i2c_dev *get_free_i2c_dev(struct i2c_adapter *adap)
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{
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struct i2c_dev *i2c_dev;
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2006-07-01 15:17:38 +00:00
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if (adap->nr >= I2C_MINORS) {
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printk(KERN_ERR "i2c-dev: Out of device minors (%d)\n",
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adap->nr);
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return ERR_PTR(-ENODEV);
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}
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2005-10-17 21:09:43 +00:00
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i2c_dev = kzalloc(sizeof(*i2c_dev), GFP_KERNEL);
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2005-04-16 22:20:36 +00:00
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if (!i2c_dev)
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return ERR_PTR(-ENOMEM);
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2006-07-01 15:16:57 +00:00
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i2c_dev->adap = adap;
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2006-07-01 15:17:38 +00:00
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spin_lock(&i2c_dev_list_lock);
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list_add_tail(&i2c_dev->list, &i2c_dev_list);
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spin_unlock(&i2c_dev_list_lock);
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2005-04-16 22:20:36 +00:00
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return i2c_dev;
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}
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2019-10-11 15:00:14 +00:00
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static void put_i2c_dev(struct i2c_dev *i2c_dev, bool del_cdev)
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2005-04-16 22:20:36 +00:00
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{
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2006-07-01 15:17:38 +00:00
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spin_lock(&i2c_dev_list_lock);
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list_del(&i2c_dev->list);
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spin_unlock(&i2c_dev_list_lock);
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2019-10-11 15:00:14 +00:00
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if (del_cdev)
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cdev_device_del(&i2c_dev->cdev, &i2c_dev->dev);
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put_device(&i2c_dev->dev);
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2005-04-16 22:20:36 +00:00
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}
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2013-09-27 02:36:11 +00:00
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static ssize_t name_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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2005-04-16 22:20:36 +00:00
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{
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2006-07-03 20:46:24 +00:00
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struct i2c_dev *i2c_dev = i2c_dev_get_by_minor(MINOR(dev->devt));
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2005-12-06 23:33:15 +00:00
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if (!i2c_dev)
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return -ENODEV;
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2005-04-16 22:20:36 +00:00
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return sprintf(buf, "%s\n", i2c_dev->adap->name);
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}
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2013-09-27 02:36:11 +00:00
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static DEVICE_ATTR_RO(name);
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static struct attribute *i2c_attrs[] = {
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&dev_attr_name.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(i2c);
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2005-04-16 22:20:36 +00:00
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2007-11-15 18:24:01 +00:00
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/* ------------------------------------------------------------------------- */
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/*
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* After opening an instance of this character special file, a file
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* descriptor starts out associated only with an i2c_adapter (and bus).
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*
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* Using the I2C_RDWR ioctl(), you can then *immediately* issue i2c_msg
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* traffic to any devices on the bus used by that adapter. That's because
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* the i2c_msg vectors embed all the addressing information they need, and
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* are submitted directly to an i2c_adapter. However, SMBus-only adapters
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* don't support that interface.
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*
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* To use read()/write() system calls on that file descriptor, or to use
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* SMBus interfaces (and work with SMBus-only hosts!), you must first issue
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* an I2C_SLAVE (or I2C_SLAVE_FORCE) ioctl. That configures an anonymous
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* (never registered) i2c_client so it holds the addressing information
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* needed by those system calls and by this SMBus interface.
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*/
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2010-05-21 16:40:59 +00:00
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static ssize_t i2cdev_read(struct file *file, char __user *buf, size_t count,
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loff_t *offset)
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2005-04-16 22:20:36 +00:00
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{
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char *tmp;
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int ret;
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2010-05-21 16:40:57 +00:00
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struct i2c_client *client = file->private_data;
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2005-04-16 22:20:36 +00:00
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if (count > 8192)
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count = 8192;
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2010-05-21 16:40:59 +00:00
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tmp = kmalloc(count, GFP_KERNEL);
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if (tmp == NULL)
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2005-04-16 22:20:36 +00:00
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return -ENOMEM;
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2008-08-10 20:56:16 +00:00
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pr_debug("i2c-dev: i2c-%d reading %zu bytes.\n",
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2013-01-23 22:07:38 +00:00
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iminor(file_inode(file)), count);
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2005-04-16 22:20:36 +00:00
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2010-05-21 16:40:59 +00:00
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ret = i2c_master_recv(client, tmp, count);
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2005-04-16 22:20:36 +00:00
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if (ret >= 0)
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2010-05-21 16:40:59 +00:00
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ret = copy_to_user(buf, tmp, count) ? -EFAULT : ret;
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2005-04-16 22:20:36 +00:00
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kfree(tmp);
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return ret;
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}
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2010-05-21 16:40:59 +00:00
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static ssize_t i2cdev_write(struct file *file, const char __user *buf,
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size_t count, loff_t *offset)
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2005-04-16 22:20:36 +00:00
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{
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int ret;
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char *tmp;
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2010-05-21 16:40:57 +00:00
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struct i2c_client *client = file->private_data;
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2005-04-16 22:20:36 +00:00
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if (count > 8192)
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count = 8192;
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i2c-dev: Use memdup_user
Use memdup_user when user data is immediately copied into the allocated
region. Note that in the second case, the ++i is no longer necessary, as
the last value is already freed if needed by the call to memdup_user.
The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)
// <smpl>
@@
expression from,to,size,flag;
position p;
identifier l1,l2;
@@
- to = \(kmalloc@p\|kzalloc@p\)(size,flag);
+ to = memdup_user(from,size);
if (
- to==NULL
+ IS_ERR(to)
|| ...) {
<+... when != goto l1;
- -ENOMEM
+ PTR_ERR(to)
...+>
}
- if (copy_from_user(to, from, size) != 0) {
- <+... when != goto l2;
- -EFAULT
- ...+>
- }
// </smpl>
Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2010-08-11 16:20:55 +00:00
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tmp = memdup_user(buf, count);
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if (IS_ERR(tmp))
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return PTR_ERR(tmp);
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2005-04-16 22:20:36 +00:00
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2008-08-10 20:56:16 +00:00
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pr_debug("i2c-dev: i2c-%d writing %zu bytes.\n",
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2013-01-23 22:07:38 +00:00
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iminor(file_inode(file)), count);
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2005-04-16 22:20:36 +00:00
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2010-05-21 16:40:59 +00:00
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ret = i2c_master_send(client, tmp, count);
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2005-04-16 22:20:36 +00:00
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kfree(tmp);
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return ret;
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}
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2008-01-27 17:14:51 +00:00
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static int i2cdev_check(struct device *dev, void *addrp)
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{
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struct i2c_client *client = i2c_verify_client(dev);
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if (!client || client->addr != *(unsigned int *)addrp)
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return 0;
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return dev->driver ? -EBUSY : 0;
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}
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2010-08-11 16:21:02 +00:00
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/* walk up mux tree */
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static int i2cdev_check_mux_parents(struct i2c_adapter *adapter, int addr)
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{
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2010-10-24 16:16:57 +00:00
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struct i2c_adapter *parent = i2c_parent_is_i2c_adapter(adapter);
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2010-08-11 16:21:02 +00:00
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int result;
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result = device_for_each_child(&adapter->dev, &addr, i2cdev_check);
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2010-10-24 16:16:57 +00:00
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if (!result && parent)
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result = i2cdev_check_mux_parents(parent, addr);
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2010-08-11 16:21:02 +00:00
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return result;
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}
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/* recurse down mux tree */
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static int i2cdev_check_mux_children(struct device *dev, void *addrp)
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{
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int result;
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if (dev->type == &i2c_adapter_type)
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result = device_for_each_child(dev, addrp,
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i2cdev_check_mux_children);
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else
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result = i2cdev_check(dev, addrp);
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return result;
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}
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2007-11-15 18:24:01 +00:00
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/* This address checking function differs from the one in i2c-core
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in that it considers an address with a registered device, but no
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2008-01-27 17:14:51 +00:00
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driver bound to it, as NOT busy. */
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2007-11-15 18:24:01 +00:00
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static int i2cdev_check_addr(struct i2c_adapter *adapter, unsigned int addr)
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{
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2010-10-24 16:16:57 +00:00
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struct i2c_adapter *parent = i2c_parent_is_i2c_adapter(adapter);
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2010-08-11 16:21:02 +00:00
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int result = 0;
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2010-10-24 16:16:57 +00:00
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if (parent)
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result = i2cdev_check_mux_parents(parent, addr);
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2010-08-11 16:21:02 +00:00
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if (!result)
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result = device_for_each_child(&adapter->dev, &addr,
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i2cdev_check_mux_children);
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return result;
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2007-11-15 18:24:01 +00:00
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}
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2015-09-08 09:05:49 +00:00
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static noinline int i2cdev_ioctl_rdwr(struct i2c_client *client,
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2017-09-20 05:02:27 +00:00
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unsigned nmsgs, struct i2c_msg *msgs)
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2005-04-16 22:20:36 +00:00
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{
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u8 __user **data_ptrs;
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2008-04-22 20:16:47 +00:00
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int i, res;
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treewide: kmalloc() -> kmalloc_array()
The kmalloc() function has a 2-factor argument form, kmalloc_array(). This
patch replaces cases of:
kmalloc(a * b, gfp)
with:
kmalloc_array(a * b, gfp)
as well as handling cases of:
kmalloc(a * b * c, gfp)
with:
kmalloc(array3_size(a, b, c), gfp)
as it's slightly less ugly than:
kmalloc_array(array_size(a, b), c, gfp)
This does, however, attempt to ignore constant size factors like:
kmalloc(4 * 1024, gfp)
though any constants defined via macros get caught up in the conversion.
Any factors with a sizeof() of "unsigned char", "char", and "u8" were
dropped, since they're redundant.
The tools/ directory was manually excluded, since it has its own
implementation of kmalloc().
The Coccinelle script used for this was:
// Fix redundant parens around sizeof().
@@
type TYPE;
expression THING, E;
@@
(
kmalloc(
- (sizeof(TYPE)) * E
+ sizeof(TYPE) * E
, ...)
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kmalloc(
- (sizeof(THING)) * E
+ sizeof(THING) * E
, ...)
)
// Drop single-byte sizes and redundant parens.
@@
expression COUNT;
typedef u8;
typedef __u8;
@@
(
kmalloc(
- sizeof(u8) * (COUNT)
+ COUNT
, ...)
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kmalloc(
- sizeof(__u8) * (COUNT)
+ COUNT
, ...)
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kmalloc(
- sizeof(char) * (COUNT)
+ COUNT
, ...)
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kmalloc(
- sizeof(unsigned char) * (COUNT)
+ COUNT
, ...)
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kmalloc(
- sizeof(u8) * COUNT
+ COUNT
, ...)
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kmalloc(
- sizeof(__u8) * COUNT
+ COUNT
, ...)
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kmalloc(
- sizeof(char) * COUNT
+ COUNT
, ...)
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kmalloc(
- sizeof(unsigned char) * COUNT
+ COUNT
, ...)
)
// 2-factor product with sizeof(type/expression) and identifier or constant.
@@
type TYPE;
expression THING;
identifier COUNT_ID;
constant COUNT_CONST;
@@
(
- kmalloc
+ kmalloc_array
(
- sizeof(TYPE) * (COUNT_ID)
+ COUNT_ID, sizeof(TYPE)
, ...)
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- kmalloc
+ kmalloc_array
(
- sizeof(TYPE) * COUNT_ID
+ COUNT_ID, sizeof(TYPE)
, ...)
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- kmalloc
+ kmalloc_array
(
- sizeof(TYPE) * (COUNT_CONST)
+ COUNT_CONST, sizeof(TYPE)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(TYPE) * COUNT_CONST
+ COUNT_CONST, sizeof(TYPE)
, ...)
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- kmalloc
+ kmalloc_array
(
- sizeof(THING) * (COUNT_ID)
+ COUNT_ID, sizeof(THING)
, ...)
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- kmalloc
+ kmalloc_array
(
- sizeof(THING) * COUNT_ID
+ COUNT_ID, sizeof(THING)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(THING) * (COUNT_CONST)
+ COUNT_CONST, sizeof(THING)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(THING) * COUNT_CONST
+ COUNT_CONST, sizeof(THING)
, ...)
)
// 2-factor product, only identifiers.
@@
identifier SIZE, COUNT;
@@
- kmalloc
+ kmalloc_array
(
- SIZE * COUNT
+ COUNT, SIZE
, ...)
// 3-factor product with 1 sizeof(type) or sizeof(expression), with
// redundant parens removed.
@@
expression THING;
identifier STRIDE, COUNT;
type TYPE;
@@
(
kmalloc(
- sizeof(TYPE) * (COUNT) * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
kmalloc(
- sizeof(TYPE) * (COUNT) * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
kmalloc(
- sizeof(TYPE) * COUNT * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
kmalloc(
- sizeof(TYPE) * COUNT * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
kmalloc(
- sizeof(THING) * (COUNT) * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
|
kmalloc(
- sizeof(THING) * (COUNT) * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
|
kmalloc(
- sizeof(THING) * COUNT * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
|
kmalloc(
- sizeof(THING) * COUNT * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
)
// 3-factor product with 2 sizeof(variable), with redundant parens removed.
@@
expression THING1, THING2;
identifier COUNT;
type TYPE1, TYPE2;
@@
(
kmalloc(
- sizeof(TYPE1) * sizeof(TYPE2) * COUNT
+ array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
, ...)
|
kmalloc(
- sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
, ...)
|
kmalloc(
- sizeof(THING1) * sizeof(THING2) * COUNT
+ array3_size(COUNT, sizeof(THING1), sizeof(THING2))
, ...)
|
kmalloc(
- sizeof(THING1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(THING1), sizeof(THING2))
, ...)
|
kmalloc(
- sizeof(TYPE1) * sizeof(THING2) * COUNT
+ array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
, ...)
|
kmalloc(
- sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
, ...)
)
// 3-factor product, only identifiers, with redundant parens removed.
@@
identifier STRIDE, SIZE, COUNT;
@@
(
kmalloc(
- (COUNT) * STRIDE * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kmalloc(
- COUNT * (STRIDE) * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kmalloc(
- COUNT * STRIDE * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kmalloc(
- (COUNT) * (STRIDE) * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kmalloc(
- COUNT * (STRIDE) * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kmalloc(
- (COUNT) * STRIDE * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kmalloc(
- (COUNT) * (STRIDE) * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kmalloc(
- COUNT * STRIDE * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
)
// Any remaining multi-factor products, first at least 3-factor products,
// when they're not all constants...
@@
expression E1, E2, E3;
constant C1, C2, C3;
@@
(
kmalloc(C1 * C2 * C3, ...)
|
kmalloc(
- (E1) * E2 * E3
+ array3_size(E1, E2, E3)
, ...)
|
kmalloc(
- (E1) * (E2) * E3
+ array3_size(E1, E2, E3)
, ...)
|
kmalloc(
- (E1) * (E2) * (E3)
+ array3_size(E1, E2, E3)
, ...)
|
kmalloc(
- E1 * E2 * E3
+ array3_size(E1, E2, E3)
, ...)
)
// And then all remaining 2 factors products when they're not all constants,
// keeping sizeof() as the second factor argument.
@@
expression THING, E1, E2;
type TYPE;
constant C1, C2, C3;
@@
(
kmalloc(sizeof(THING) * C2, ...)
|
kmalloc(sizeof(TYPE) * C2, ...)
|
kmalloc(C1 * C2 * C3, ...)
|
kmalloc(C1 * C2, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(TYPE) * (E2)
+ E2, sizeof(TYPE)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(TYPE) * E2
+ E2, sizeof(TYPE)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(THING) * (E2)
+ E2, sizeof(THING)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(THING) * E2
+ E2, sizeof(THING)
, ...)
|
- kmalloc
+ kmalloc_array
(
- (E1) * E2
+ E1, E2
, ...)
|
- kmalloc
+ kmalloc_array
(
- (E1) * (E2)
+ E1, E2
, ...)
|
- kmalloc
+ kmalloc_array
(
- E1 * E2
+ E1, E2
, ...)
)
Signed-off-by: Kees Cook <keescook@chromium.org>
2018-06-12 20:55:00 +00:00
|
|
|
data_ptrs = kmalloc_array(nmsgs, sizeof(u8 __user *), GFP_KERNEL);
|
2008-04-22 20:16:47 +00:00
|
|
|
if (data_ptrs == NULL) {
|
2017-09-20 05:02:27 +00:00
|
|
|
kfree(msgs);
|
2008-04-22 20:16:47 +00:00
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
|
|
|
|
res = 0;
|
2017-09-20 05:02:27 +00:00
|
|
|
for (i = 0; i < nmsgs; i++) {
|
2012-05-30 08:55:34 +00:00
|
|
|
/* Limit the size of the message to a sane amount */
|
2017-09-20 05:02:27 +00:00
|
|
|
if (msgs[i].len > 8192) {
|
2008-04-22 20:16:47 +00:00
|
|
|
res = -EINVAL;
|
|
|
|
break;
|
|
|
|
}
|
2012-05-30 08:55:34 +00:00
|
|
|
|
2017-09-20 05:02:27 +00:00
|
|
|
data_ptrs[i] = (u8 __user *)msgs[i].buf;
|
|
|
|
msgs[i].buf = memdup_user(data_ptrs[i], msgs[i].len);
|
|
|
|
if (IS_ERR(msgs[i].buf)) {
|
|
|
|
res = PTR_ERR(msgs[i].buf);
|
2008-04-22 20:16:47 +00:00
|
|
|
break;
|
|
|
|
}
|
2017-11-04 20:20:03 +00:00
|
|
|
/* memdup_user allocates with GFP_KERNEL, so DMA is ok */
|
|
|
|
msgs[i].flags |= I2C_M_DMA_SAFE;
|
2012-05-30 08:55:34 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* If the message length is received from the slave (similar
|
|
|
|
* to SMBus block read), we must ensure that the buffer will
|
|
|
|
* be large enough to cope with a message length of
|
|
|
|
* I2C_SMBUS_BLOCK_MAX as this is the maximum underlying bus
|
|
|
|
* drivers allow. The first byte in the buffer must be
|
|
|
|
* pre-filled with the number of extra bytes, which must be
|
|
|
|
* at least one to hold the message length, but can be
|
|
|
|
* greater (for example to account for a checksum byte at
|
|
|
|
* the end of the message.)
|
|
|
|
*/
|
2017-09-20 05:02:27 +00:00
|
|
|
if (msgs[i].flags & I2C_M_RECV_LEN) {
|
|
|
|
if (!(msgs[i].flags & I2C_M_RD) ||
|
2018-04-19 12:29:22 +00:00
|
|
|
msgs[i].len < 1 || msgs[i].buf[0] < 1 ||
|
2017-09-20 05:02:27 +00:00
|
|
|
msgs[i].len < msgs[i].buf[0] +
|
2012-05-30 08:55:34 +00:00
|
|
|
I2C_SMBUS_BLOCK_MAX) {
|
2019-05-07 14:20:32 +00:00
|
|
|
i++;
|
2012-05-30 08:55:34 +00:00
|
|
|
res = -EINVAL;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
2017-09-20 05:02:27 +00:00
|
|
|
msgs[i].len = msgs[i].buf[0];
|
2012-05-30 08:55:34 +00:00
|
|
|
}
|
2008-04-22 20:16:47 +00:00
|
|
|
}
|
|
|
|
if (res < 0) {
|
|
|
|
int j;
|
|
|
|
for (j = 0; j < i; ++j)
|
2017-09-20 05:02:27 +00:00
|
|
|
kfree(msgs[j].buf);
|
2008-04-22 20:16:47 +00:00
|
|
|
kfree(data_ptrs);
|
2017-09-20 05:02:27 +00:00
|
|
|
kfree(msgs);
|
2008-04-22 20:16:47 +00:00
|
|
|
return res;
|
|
|
|
}
|
|
|
|
|
2017-09-20 05:02:27 +00:00
|
|
|
res = i2c_transfer(client->adapter, msgs, nmsgs);
|
2008-04-22 20:16:47 +00:00
|
|
|
while (i-- > 0) {
|
2017-09-20 05:02:27 +00:00
|
|
|
if (res >= 0 && (msgs[i].flags & I2C_M_RD)) {
|
|
|
|
if (copy_to_user(data_ptrs[i], msgs[i].buf,
|
|
|
|
msgs[i].len))
|
2008-04-22 20:16:47 +00:00
|
|
|
res = -EFAULT;
|
|
|
|
}
|
2017-09-20 05:02:27 +00:00
|
|
|
kfree(msgs[i].buf);
|
2008-04-22 20:16:47 +00:00
|
|
|
}
|
|
|
|
kfree(data_ptrs);
|
2017-09-20 05:02:27 +00:00
|
|
|
kfree(msgs);
|
2008-04-22 20:16:47 +00:00
|
|
|
return res;
|
|
|
|
}
|
|
|
|
|
|
|
|
static noinline int i2cdev_ioctl_smbus(struct i2c_client *client,
|
2017-09-20 05:02:27 +00:00
|
|
|
u8 read_write, u8 command, u32 size,
|
|
|
|
union i2c_smbus_data __user *data)
|
2008-04-22 20:16:47 +00:00
|
|
|
{
|
2017-01-09 15:53:36 +00:00
|
|
|
union i2c_smbus_data temp = {};
|
2008-04-22 20:16:47 +00:00
|
|
|
int datasize, res;
|
|
|
|
|
2017-09-20 05:02:27 +00:00
|
|
|
if ((size != I2C_SMBUS_BYTE) &&
|
|
|
|
(size != I2C_SMBUS_QUICK) &&
|
|
|
|
(size != I2C_SMBUS_BYTE_DATA) &&
|
|
|
|
(size != I2C_SMBUS_WORD_DATA) &&
|
|
|
|
(size != I2C_SMBUS_PROC_CALL) &&
|
|
|
|
(size != I2C_SMBUS_BLOCK_DATA) &&
|
|
|
|
(size != I2C_SMBUS_I2C_BLOCK_BROKEN) &&
|
|
|
|
(size != I2C_SMBUS_I2C_BLOCK_DATA) &&
|
|
|
|
(size != I2C_SMBUS_BLOCK_PROC_CALL)) {
|
2008-04-22 20:16:47 +00:00
|
|
|
dev_dbg(&client->adapter->dev,
|
|
|
|
"size out of range (%x) in ioctl I2C_SMBUS.\n",
|
2017-09-20 05:02:27 +00:00
|
|
|
size);
|
2008-04-22 20:16:47 +00:00
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
/* Note that I2C_SMBUS_READ and I2C_SMBUS_WRITE are 0 and 1,
|
|
|
|
so the check is valid if size==I2C_SMBUS_QUICK too. */
|
2017-09-20 05:02:27 +00:00
|
|
|
if ((read_write != I2C_SMBUS_READ) &&
|
|
|
|
(read_write != I2C_SMBUS_WRITE)) {
|
2008-04-22 20:16:47 +00:00
|
|
|
dev_dbg(&client->adapter->dev,
|
|
|
|
"read_write out of range (%x) in ioctl I2C_SMBUS.\n",
|
2017-09-20 05:02:27 +00:00
|
|
|
read_write);
|
2008-04-22 20:16:47 +00:00
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Note that command values are always valid! */
|
|
|
|
|
2017-09-20 05:02:27 +00:00
|
|
|
if ((size == I2C_SMBUS_QUICK) ||
|
|
|
|
((size == I2C_SMBUS_BYTE) &&
|
|
|
|
(read_write == I2C_SMBUS_WRITE)))
|
2008-04-22 20:16:47 +00:00
|
|
|
/* These are special: we do not use data */
|
|
|
|
return i2c_smbus_xfer(client->adapter, client->addr,
|
2017-09-20 05:02:27 +00:00
|
|
|
client->flags, read_write,
|
|
|
|
command, size, NULL);
|
2008-04-22 20:16:47 +00:00
|
|
|
|
2017-09-20 05:02:27 +00:00
|
|
|
if (data == NULL) {
|
2008-04-22 20:16:47 +00:00
|
|
|
dev_dbg(&client->adapter->dev,
|
|
|
|
"data is NULL pointer in ioctl I2C_SMBUS.\n");
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
2017-09-20 05:02:27 +00:00
|
|
|
if ((size == I2C_SMBUS_BYTE_DATA) ||
|
|
|
|
(size == I2C_SMBUS_BYTE))
|
|
|
|
datasize = sizeof(data->byte);
|
|
|
|
else if ((size == I2C_SMBUS_WORD_DATA) ||
|
|
|
|
(size == I2C_SMBUS_PROC_CALL))
|
|
|
|
datasize = sizeof(data->word);
|
2008-04-22 20:16:47 +00:00
|
|
|
else /* size == smbus block, i2c block, or block proc. call */
|
2017-09-20 05:02:27 +00:00
|
|
|
datasize = sizeof(data->block);
|
2008-04-22 20:16:47 +00:00
|
|
|
|
2017-09-20 05:02:27 +00:00
|
|
|
if ((size == I2C_SMBUS_PROC_CALL) ||
|
|
|
|
(size == I2C_SMBUS_BLOCK_PROC_CALL) ||
|
|
|
|
(size == I2C_SMBUS_I2C_BLOCK_DATA) ||
|
|
|
|
(read_write == I2C_SMBUS_WRITE)) {
|
|
|
|
if (copy_from_user(&temp, data, datasize))
|
2008-04-22 20:16:47 +00:00
|
|
|
return -EFAULT;
|
|
|
|
}
|
2017-09-20 05:02:27 +00:00
|
|
|
if (size == I2C_SMBUS_I2C_BLOCK_BROKEN) {
|
2008-04-22 20:16:47 +00:00
|
|
|
/* Convert old I2C block commands to the new
|
|
|
|
convention. This preserves binary compatibility. */
|
2017-09-20 05:02:27 +00:00
|
|
|
size = I2C_SMBUS_I2C_BLOCK_DATA;
|
|
|
|
if (read_write == I2C_SMBUS_READ)
|
2008-04-22 20:16:47 +00:00
|
|
|
temp.block[0] = I2C_SMBUS_BLOCK_MAX;
|
|
|
|
}
|
|
|
|
res = i2c_smbus_xfer(client->adapter, client->addr, client->flags,
|
2017-09-20 05:02:27 +00:00
|
|
|
read_write, command, size, &temp);
|
|
|
|
if (!res && ((size == I2C_SMBUS_PROC_CALL) ||
|
|
|
|
(size == I2C_SMBUS_BLOCK_PROC_CALL) ||
|
|
|
|
(read_write == I2C_SMBUS_READ))) {
|
|
|
|
if (copy_to_user(data, &temp, datasize))
|
2008-04-22 20:16:47 +00:00
|
|
|
return -EFAULT;
|
|
|
|
}
|
|
|
|
return res;
|
|
|
|
}
|
|
|
|
|
2008-07-14 20:38:27 +00:00
|
|
|
static long i2cdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
|
2008-04-22 20:16:47 +00:00
|
|
|
{
|
2010-05-21 16:40:57 +00:00
|
|
|
struct i2c_client *client = file->private_data;
|
2005-04-16 22:20:36 +00:00
|
|
|
unsigned long funcs;
|
|
|
|
|
2005-10-07 21:06:27 +00:00
|
|
|
dev_dbg(&client->adapter->dev, "ioctl, cmd=0x%02x, arg=0x%02lx\n",
|
|
|
|
cmd, arg);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2010-05-21 16:40:59 +00:00
|
|
|
switch (cmd) {
|
2005-04-16 22:20:36 +00:00
|
|
|
case I2C_SLAVE:
|
|
|
|
case I2C_SLAVE_FORCE:
|
2006-12-10 20:21:31 +00:00
|
|
|
if ((arg > 0x3ff) ||
|
2005-04-16 22:20:36 +00:00
|
|
|
(((client->flags & I2C_M_TEN) == 0) && arg > 0x7f))
|
|
|
|
return -EINVAL;
|
2007-11-15 18:24:01 +00:00
|
|
|
if (cmd == I2C_SLAVE && i2cdev_check_addr(client->adapter, arg))
|
2005-04-16 22:20:36 +00:00
|
|
|
return -EBUSY;
|
2007-11-15 18:24:01 +00:00
|
|
|
/* REVISIT: address could become busy later */
|
2005-04-16 22:20:36 +00:00
|
|
|
client->addr = arg;
|
|
|
|
return 0;
|
|
|
|
case I2C_TENBIT:
|
|
|
|
if (arg)
|
|
|
|
client->flags |= I2C_M_TEN;
|
|
|
|
else
|
|
|
|
client->flags &= ~I2C_M_TEN;
|
|
|
|
return 0;
|
|
|
|
case I2C_PEC:
|
2015-09-11 09:27:18 +00:00
|
|
|
/*
|
|
|
|
* Setting the PEC flag here won't affect kernel drivers,
|
|
|
|
* which will be using the i2c_client node registered with
|
|
|
|
* the driver model core. Likewise, when that client has
|
|
|
|
* the PEC flag already set, the i2c-dev driver won't see
|
|
|
|
* (or use) this setting.
|
|
|
|
*/
|
2005-04-16 22:20:36 +00:00
|
|
|
if (arg)
|
|
|
|
client->flags |= I2C_CLIENT_PEC;
|
|
|
|
else
|
|
|
|
client->flags &= ~I2C_CLIENT_PEC;
|
|
|
|
return 0;
|
|
|
|
case I2C_FUNCS:
|
|
|
|
funcs = i2c_get_functionality(client->adapter);
|
2006-12-10 20:21:30 +00:00
|
|
|
return put_user(funcs, (unsigned long __user *)arg);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2017-09-20 05:02:27 +00:00
|
|
|
case I2C_RDWR: {
|
|
|
|
struct i2c_rdwr_ioctl_data rdwr_arg;
|
|
|
|
struct i2c_msg *rdwr_pa;
|
|
|
|
|
|
|
|
if (copy_from_user(&rdwr_arg,
|
|
|
|
(struct i2c_rdwr_ioctl_data __user *)arg,
|
|
|
|
sizeof(rdwr_arg)))
|
|
|
|
return -EFAULT;
|
|
|
|
|
2021-03-12 11:57:34 +00:00
|
|
|
if (!rdwr_arg.msgs || rdwr_arg.nmsgs == 0)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Put an arbitrary limit on the number of messages that can
|
|
|
|
* be sent at once
|
|
|
|
*/
|
2017-09-20 05:02:27 +00:00
|
|
|
if (rdwr_arg.nmsgs > I2C_RDWR_IOCTL_MAX_MSGS)
|
|
|
|
return -EINVAL;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2017-09-20 05:02:27 +00:00
|
|
|
rdwr_pa = memdup_user(rdwr_arg.msgs,
|
|
|
|
rdwr_arg.nmsgs * sizeof(struct i2c_msg));
|
|
|
|
if (IS_ERR(rdwr_pa))
|
|
|
|
return PTR_ERR(rdwr_pa);
|
|
|
|
|
|
|
|
return i2cdev_ioctl_rdwr(client, rdwr_arg.nmsgs, rdwr_pa);
|
|
|
|
}
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2017-09-20 05:02:27 +00:00
|
|
|
case I2C_SMBUS: {
|
|
|
|
struct i2c_smbus_ioctl_data data_arg;
|
|
|
|
if (copy_from_user(&data_arg,
|
|
|
|
(struct i2c_smbus_ioctl_data __user *) arg,
|
|
|
|
sizeof(struct i2c_smbus_ioctl_data)))
|
|
|
|
return -EFAULT;
|
|
|
|
return i2cdev_ioctl_smbus(client, data_arg.read_write,
|
|
|
|
data_arg.command,
|
|
|
|
data_arg.size,
|
|
|
|
data_arg.data);
|
|
|
|
}
|
2007-10-13 21:56:32 +00:00
|
|
|
case I2C_RETRIES:
|
2019-01-09 07:33:07 +00:00
|
|
|
if (arg > INT_MAX)
|
|
|
|
return -EINVAL;
|
|
|
|
|
2007-10-13 21:56:32 +00:00
|
|
|
client->adapter->retries = arg;
|
|
|
|
break;
|
|
|
|
case I2C_TIMEOUT:
|
2019-01-09 07:33:07 +00:00
|
|
|
if (arg > INT_MAX)
|
|
|
|
return -EINVAL;
|
|
|
|
|
2009-02-24 18:19:49 +00:00
|
|
|
/* For historical reasons, user-space sets the timeout
|
|
|
|
* value in units of 10 ms.
|
|
|
|
*/
|
|
|
|
client->adapter->timeout = msecs_to_jiffies(arg * 10);
|
2007-10-13 21:56:32 +00:00
|
|
|
break;
|
2005-04-16 22:20:36 +00:00
|
|
|
default:
|
2007-10-13 21:56:32 +00:00
|
|
|
/* NOTE: returning a fault code here could cause trouble
|
|
|
|
* in buggy userspace code. Some old kernel bugs returned
|
|
|
|
* zero in this case, and userspace code might accidentally
|
|
|
|
* have depended on that bug.
|
|
|
|
*/
|
|
|
|
return -ENOTTY;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2017-09-20 05:02:27 +00:00
|
|
|
#ifdef CONFIG_COMPAT
|
|
|
|
|
|
|
|
struct i2c_smbus_ioctl_data32 {
|
|
|
|
u8 read_write;
|
|
|
|
u8 command;
|
|
|
|
u32 size;
|
|
|
|
compat_caddr_t data; /* union i2c_smbus_data *data */
|
|
|
|
};
|
|
|
|
|
|
|
|
struct i2c_msg32 {
|
|
|
|
u16 addr;
|
|
|
|
u16 flags;
|
|
|
|
u16 len;
|
|
|
|
compat_caddr_t buf;
|
|
|
|
};
|
|
|
|
|
|
|
|
struct i2c_rdwr_ioctl_data32 {
|
|
|
|
compat_caddr_t msgs; /* struct i2c_msg __user *msgs */
|
|
|
|
u32 nmsgs;
|
|
|
|
};
|
|
|
|
|
|
|
|
static long compat_i2cdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
|
|
|
|
{
|
|
|
|
struct i2c_client *client = file->private_data;
|
|
|
|
unsigned long funcs;
|
|
|
|
switch (cmd) {
|
|
|
|
case I2C_FUNCS:
|
|
|
|
funcs = i2c_get_functionality(client->adapter);
|
|
|
|
return put_user(funcs, (compat_ulong_t __user *)arg);
|
|
|
|
case I2C_RDWR: {
|
|
|
|
struct i2c_rdwr_ioctl_data32 rdwr_arg;
|
2021-06-24 15:25:35 +00:00
|
|
|
struct i2c_msg32 __user *p;
|
2017-09-20 05:02:27 +00:00
|
|
|
struct i2c_msg *rdwr_pa;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
if (copy_from_user(&rdwr_arg,
|
|
|
|
(struct i2c_rdwr_ioctl_data32 __user *)arg,
|
|
|
|
sizeof(rdwr_arg)))
|
|
|
|
return -EFAULT;
|
|
|
|
|
|
|
|
if (rdwr_arg.nmsgs > I2C_RDWR_IOCTL_MAX_MSGS)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
rdwr_pa = kmalloc_array(rdwr_arg.nmsgs, sizeof(struct i2c_msg),
|
|
|
|
GFP_KERNEL);
|
|
|
|
if (!rdwr_pa)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
p = compat_ptr(rdwr_arg.msgs);
|
|
|
|
for (i = 0; i < rdwr_arg.nmsgs; i++) {
|
|
|
|
struct i2c_msg32 umsg;
|
|
|
|
if (copy_from_user(&umsg, p + i, sizeof(umsg))) {
|
|
|
|
kfree(rdwr_pa);
|
|
|
|
return -EFAULT;
|
|
|
|
}
|
|
|
|
rdwr_pa[i] = (struct i2c_msg) {
|
|
|
|
.addr = umsg.addr,
|
|
|
|
.flags = umsg.flags,
|
|
|
|
.len = umsg.len,
|
|
|
|
.buf = compat_ptr(umsg.buf)
|
|
|
|
};
|
|
|
|
}
|
|
|
|
|
|
|
|
return i2cdev_ioctl_rdwr(client, rdwr_arg.nmsgs, rdwr_pa);
|
|
|
|
}
|
|
|
|
case I2C_SMBUS: {
|
|
|
|
struct i2c_smbus_ioctl_data32 data32;
|
|
|
|
if (copy_from_user(&data32,
|
|
|
|
(void __user *) arg,
|
|
|
|
sizeof(data32)))
|
|
|
|
return -EFAULT;
|
|
|
|
return i2cdev_ioctl_smbus(client, data32.read_write,
|
|
|
|
data32.command,
|
|
|
|
data32.size,
|
|
|
|
compat_ptr(data32.data));
|
|
|
|
}
|
|
|
|
default:
|
|
|
|
return i2cdev_ioctl(file, cmd, arg);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
#else
|
|
|
|
#define compat_i2cdev_ioctl NULL
|
|
|
|
#endif
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
static int i2cdev_open(struct inode *inode, struct file *file)
|
|
|
|
{
|
|
|
|
unsigned int minor = iminor(inode);
|
|
|
|
struct i2c_client *client;
|
|
|
|
struct i2c_adapter *adap;
|
|
|
|
|
2016-07-06 02:57:06 +00:00
|
|
|
adap = i2c_get_adapter(minor);
|
2009-12-06 16:06:26 +00:00
|
|
|
if (!adap)
|
|
|
|
return -ENODEV;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2007-11-15 18:24:01 +00:00
|
|
|
/* This creates an anonymous i2c_client, which may later be
|
|
|
|
* pointed to some address using I2C_SLAVE or I2C_SLAVE_FORCE.
|
|
|
|
*
|
|
|
|
* This client is ** NEVER REGISTERED ** with the driver model
|
|
|
|
* or I2C core code!! It just holds private copies of addressing
|
|
|
|
* information and maybe a PEC flag.
|
|
|
|
*/
|
2006-07-01 15:20:57 +00:00
|
|
|
client = kzalloc(sizeof(*client), GFP_KERNEL);
|
2005-04-16 22:20:36 +00:00
|
|
|
if (!client) {
|
|
|
|
i2c_put_adapter(adap);
|
2009-12-06 16:06:26 +00:00
|
|
|
return -ENOMEM;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
2006-07-01 15:20:57 +00:00
|
|
|
snprintf(client->name, I2C_NAME_SIZE, "i2c-dev %d", adap->nr);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
client->adapter = adap;
|
|
|
|
file->private_data = client;
|
|
|
|
|
2009-12-06 16:06:26 +00:00
|
|
|
return 0;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static int i2cdev_release(struct inode *inode, struct file *file)
|
|
|
|
{
|
|
|
|
struct i2c_client *client = file->private_data;
|
|
|
|
|
|
|
|
i2c_put_adapter(client->adapter);
|
|
|
|
kfree(client);
|
|
|
|
file->private_data = NULL;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2007-02-12 08:55:32 +00:00
|
|
|
static const struct file_operations i2cdev_fops = {
|
2005-04-16 22:20:36 +00:00
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.llseek = no_llseek,
|
|
|
|
.read = i2cdev_read,
|
|
|
|
.write = i2cdev_write,
|
2008-07-14 20:38:27 +00:00
|
|
|
.unlocked_ioctl = i2cdev_ioctl,
|
2017-09-20 05:02:27 +00:00
|
|
|
.compat_ioctl = compat_i2cdev_ioctl,
|
2005-04-16 22:20:36 +00:00
|
|
|
.open = i2cdev_open,
|
|
|
|
.release = i2cdev_release,
|
|
|
|
};
|
|
|
|
|
2007-11-15 18:24:01 +00:00
|
|
|
/* ------------------------------------------------------------------------- */
|
|
|
|
|
2005-12-06 23:33:15 +00:00
|
|
|
static struct class *i2c_dev_class;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2019-10-11 15:00:14 +00:00
|
|
|
static void i2cdev_dev_release(struct device *dev)
|
|
|
|
{
|
|
|
|
struct i2c_dev *i2c_dev;
|
|
|
|
|
|
|
|
i2c_dev = container_of(dev, struct i2c_dev, dev);
|
|
|
|
kfree(i2c_dev);
|
|
|
|
}
|
|
|
|
|
2011-03-20 13:50:52 +00:00
|
|
|
static int i2cdev_attach_adapter(struct device *dev, void *dummy)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2011-03-20 13:50:52 +00:00
|
|
|
struct i2c_adapter *adap;
|
2005-04-16 22:20:36 +00:00
|
|
|
struct i2c_dev *i2c_dev;
|
2006-08-15 16:30:24 +00:00
|
|
|
int res;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2011-03-20 13:50:52 +00:00
|
|
|
if (dev->type != &i2c_adapter_type)
|
|
|
|
return 0;
|
|
|
|
adap = to_i2c_adapter(dev);
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
i2c_dev = get_free_i2c_dev(adap);
|
|
|
|
if (IS_ERR(i2c_dev))
|
|
|
|
return PTR_ERR(i2c_dev);
|
|
|
|
|
2016-05-03 18:45:43 +00:00
|
|
|
cdev_init(&i2c_dev->cdev, &i2cdev_fops);
|
|
|
|
i2c_dev->cdev.owner = THIS_MODULE;
|
2019-10-11 15:00:14 +00:00
|
|
|
|
|
|
|
device_initialize(&i2c_dev->dev);
|
|
|
|
i2c_dev->dev.devt = MKDEV(I2C_MAJOR, adap->nr);
|
|
|
|
i2c_dev->dev.class = i2c_dev_class;
|
|
|
|
i2c_dev->dev.parent = &adap->dev;
|
|
|
|
i2c_dev->dev.release = i2cdev_dev_release;
|
|
|
|
dev_set_name(&i2c_dev->dev, "i2c-%d", adap->nr);
|
|
|
|
|
|
|
|
res = cdev_device_add(&i2c_dev->cdev, &i2c_dev->dev);
|
|
|
|
if (res) {
|
|
|
|
put_i2c_dev(i2c_dev, false);
|
|
|
|
return res;
|
2006-08-15 16:30:24 +00:00
|
|
|
}
|
2006-09-03 20:19:25 +00:00
|
|
|
|
|
|
|
pr_debug("i2c-dev: adapter [%s] registered as minor %d\n",
|
|
|
|
adap->name, adap->nr);
|
2005-04-16 22:20:36 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2011-03-20 13:50:52 +00:00
|
|
|
static int i2cdev_detach_adapter(struct device *dev, void *dummy)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2011-03-20 13:50:52 +00:00
|
|
|
struct i2c_adapter *adap;
|
2005-04-16 22:20:36 +00:00
|
|
|
struct i2c_dev *i2c_dev;
|
|
|
|
|
2011-03-20 13:50:52 +00:00
|
|
|
if (dev->type != &i2c_adapter_type)
|
|
|
|
return 0;
|
|
|
|
adap = to_i2c_adapter(dev);
|
|
|
|
|
2006-07-01 15:16:57 +00:00
|
|
|
i2c_dev = i2c_dev_get_by_minor(adap->nr);
|
2006-09-03 20:19:25 +00:00
|
|
|
if (!i2c_dev) /* attach_adapter must have failed */
|
|
|
|
return 0;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2019-10-11 15:00:14 +00:00
|
|
|
put_i2c_dev(i2c_dev, true);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2005-07-31 17:02:53 +00:00
|
|
|
pr_debug("i2c-dev: adapter [%s] unregistered\n", adap->name);
|
2005-04-16 22:20:36 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2011-11-23 10:33:07 +00:00
|
|
|
static int i2cdev_notifier_call(struct notifier_block *nb, unsigned long action,
|
2011-03-20 13:50:52 +00:00
|
|
|
void *data)
|
|
|
|
{
|
|
|
|
struct device *dev = data;
|
|
|
|
|
|
|
|
switch (action) {
|
|
|
|
case BUS_NOTIFY_ADD_DEVICE:
|
|
|
|
return i2cdev_attach_adapter(dev, NULL);
|
|
|
|
case BUS_NOTIFY_DEL_DEVICE:
|
|
|
|
return i2cdev_detach_adapter(dev, NULL);
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct notifier_block i2cdev_notifier = {
|
|
|
|
.notifier_call = i2cdev_notifier_call,
|
2005-04-16 22:20:36 +00:00
|
|
|
};
|
|
|
|
|
2007-11-15 18:24:01 +00:00
|
|
|
/* ------------------------------------------------------------------------- */
|
|
|
|
|
|
|
|
/*
|
|
|
|
* module load/unload record keeping
|
|
|
|
*/
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
static int __init i2c_dev_init(void)
|
|
|
|
{
|
|
|
|
int res;
|
|
|
|
|
|
|
|
printk(KERN_INFO "i2c /dev entries driver\n");
|
|
|
|
|
2016-05-03 18:45:43 +00:00
|
|
|
res = register_chrdev_region(MKDEV(I2C_MAJOR, 0), I2C_MINORS, "i2c");
|
2005-04-16 22:20:36 +00:00
|
|
|
if (res)
|
|
|
|
goto out;
|
|
|
|
|
2005-12-06 23:33:15 +00:00
|
|
|
i2c_dev_class = class_create(THIS_MODULE, "i2c-dev");
|
2008-09-24 11:39:21 +00:00
|
|
|
if (IS_ERR(i2c_dev_class)) {
|
|
|
|
res = PTR_ERR(i2c_dev_class);
|
2005-04-16 22:20:36 +00:00
|
|
|
goto out_unreg_chrdev;
|
2008-09-24 11:39:21 +00:00
|
|
|
}
|
2013-09-27 02:36:11 +00:00
|
|
|
i2c_dev_class->dev_groups = i2c_groups;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2011-03-20 13:50:52 +00:00
|
|
|
/* Keep track of adapters which will be added or removed later */
|
|
|
|
res = bus_register_notifier(&i2c_bus_type, &i2cdev_notifier);
|
2005-04-16 22:20:36 +00:00
|
|
|
if (res)
|
|
|
|
goto out_unreg_class;
|
|
|
|
|
2011-03-20 13:50:52 +00:00
|
|
|
/* Bind to already existing adapters right away */
|
|
|
|
i2c_for_each_dev(NULL, i2cdev_attach_adapter);
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
return 0;
|
|
|
|
|
|
|
|
out_unreg_class:
|
2005-12-06 23:33:15 +00:00
|
|
|
class_destroy(i2c_dev_class);
|
2005-04-16 22:20:36 +00:00
|
|
|
out_unreg_chrdev:
|
2016-05-03 18:45:43 +00:00
|
|
|
unregister_chrdev_region(MKDEV(I2C_MAJOR, 0), I2C_MINORS);
|
2005-04-16 22:20:36 +00:00
|
|
|
out:
|
|
|
|
printk(KERN_ERR "%s: Driver Initialisation failed\n", __FILE__);
|
|
|
|
return res;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit i2c_dev_exit(void)
|
|
|
|
{
|
2011-03-20 13:50:52 +00:00
|
|
|
bus_unregister_notifier(&i2c_bus_type, &i2cdev_notifier);
|
|
|
|
i2c_for_each_dev(NULL, i2cdev_detach_adapter);
|
2005-12-06 23:33:15 +00:00
|
|
|
class_destroy(i2c_dev_class);
|
2016-05-03 18:45:43 +00:00
|
|
|
unregister_chrdev_region(MKDEV(I2C_MAJOR, 0), I2C_MINORS);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
2020-06-11 11:05:34 +00:00
|
|
|
MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>");
|
|
|
|
MODULE_AUTHOR("Simon G. Vogl <simon@tk.uni-linz.ac.at>");
|
2005-04-16 22:20:36 +00:00
|
|
|
MODULE_DESCRIPTION("I2C /dev entries driver");
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
|
|
|
|
module_init(i2c_dev_init);
|
|
|
|
module_exit(i2c_dev_exit);
|