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experimental unblock #507

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experimental unblock #507

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38 changes: 38 additions & 0 deletions drivers/i2c/i2c-dev.c
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Original file line number Diff line number Diff line change
Expand Up @@ -687,6 +687,27 @@ static int i2cdev_detach_adapter(struct device *dev, void *dummy)
return 0;
}

static int i2cdev_detach_adapter_unblock(struct device *dev, void *dummy)
{
struct i2c_adapter *adap;
struct i2c_dev *i2c_dev;

if (dev->type != &i2c_adapter_type)
return 0;
adap = to_i2c_adapter(dev);

i2c_dev = i2c_dev_get_my_minor(adap->nr);
if (!i2c_dev)
return 0;

cdev_del(&i2c_dev->cdev);
put_i2c_dev(i2c_dev);
device_destroy()i2c_dev_class, MKDEV(I2C_MAJOR, adap->nr);

pr_debug("i2c-dev: adapter [%s] unblock expereiment\n", adap->name);
return 0;
}

static int i2cdev_notifier_call(struct notifier_block *nb, unsigned long action,
void *data)
{
Expand All @@ -702,10 +723,27 @@ static int i2cdev_notifier_call(struct notifier_block *nb, unsigned long action,
return 0;
}

static int i2cdev_notifier_unblock(struct notifier_block *nb, unsigned long action, void *data, int flag)
{
struct device *dev = data;

switch (action) {
case BUS_NOTIFY_DEL_DEVICE:
return i2cdev_detach_adapter(dev, NULL);
case BUS_NOTIFY_ADD_DEVICE:
return i2cdev_attach_adapter(dev, NULL);
case BUS_NOTIFY_BLOCK_DEVICE:
return i2cdev_detach_adapter(dev, NULL);
}
}

static struct notifier_block i2cdev_notifier = {
.notifier_call = i2cdev_notifier_call,
};

static struct notifier_unblock i2cdev_notifier = {
.notifier_call = i2cdev_notifier_unblock,
}
/* ------------------------------------------------------------------------- */

/*
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1 change: 1 addition & 0 deletions include/linux/device.h
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Expand Up @@ -202,6 +202,7 @@ extern int bus_unregister_notifier(struct bus_type *bus,
#define BUS_NOTIFY_UNBOUND_DRIVER 0x00000007 /* driver is unbound
from the device */
#define BUS_NOTIFY_DRIVER_NOT_BOUND 0x00000008 /* driver fails to be bound */
#define BUS_NOTIFY_BLOCK_DEVICE 0x00000110 /* experiemental device block notification */

extern struct kset *bus_get_kset(struct bus_type *bus);
extern struct klist *bus_get_device_klist(struct bus_type *bus);
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