diff options
Diffstat (limited to 'drivers/i2c/i2c-core.c')
| -rw-r--r-- | drivers/i2c/i2c-core.c | 176 |
1 files changed, 125 insertions, 51 deletions
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c index 0e45c296d3d2..296504355142 100644 --- a/drivers/i2c/i2c-core.c +++ b/drivers/i2c/i2c-core.c @@ -46,6 +46,7 @@ static DEFINE_MUTEX(core_lock); static DEFINE_IDR(i2c_adapter_idr); static LIST_HEAD(userspace_devices); +static struct device_type i2c_client_type; static int i2c_check_addr(struct i2c_adapter *adapter, int addr); static int i2c_detect(struct i2c_adapter *adapter, struct i2c_driver *driver); @@ -64,9 +65,13 @@ static const struct i2c_device_id *i2c_match_id(const struct i2c_device_id *id, static int i2c_device_match(struct device *dev, struct device_driver *drv) { - struct i2c_client *client = to_i2c_client(dev); - struct i2c_driver *driver = to_i2c_driver(drv); + struct i2c_client *client = i2c_verify_client(dev); + struct i2c_driver *driver; + if (!client) + return 0; + + driver = to_i2c_driver(drv); /* match on an id table if there is one */ if (driver->id_table) return i2c_match_id(driver->id_table, client) != NULL; @@ -94,10 +99,14 @@ static int i2c_device_uevent(struct device *dev, struct kobj_uevent_env *env) static int i2c_device_probe(struct device *dev) { - struct i2c_client *client = to_i2c_client(dev); - struct i2c_driver *driver = to_i2c_driver(dev->driver); + struct i2c_client *client = i2c_verify_client(dev); + struct i2c_driver *driver; int status; + if (!client) + return 0; + + driver = to_i2c_driver(dev->driver); if (!driver->probe || !driver->id_table) return -ENODEV; client->driver = driver; @@ -114,11 +123,11 @@ static int i2c_device_probe(struct device *dev) static int i2c_device_remove(struct device *dev) { - struct i2c_client *client = to_i2c_client(dev); + struct i2c_client *client = i2c_verify_client(dev); struct i2c_driver *driver; int status; - if (!dev->driver) + if (!client || !dev->driver) return 0; driver = to_i2c_driver(dev->driver); @@ -136,37 +145,40 @@ static int i2c_device_remove(struct device *dev) static void i2c_device_shutdown(struct device *dev) { + struct i2c_client *client = i2c_verify_client(dev); struct i2c_driver *driver; - if (!dev->driver) + if (!client || !dev->driver) return; driver = to_i2c_driver(dev->driver); if (driver->shutdown) - driver->shutdown(to_i2c_client(dev)); + driver->shutdown(client); } static int i2c_device_suspend(struct device *dev, pm_message_t mesg) { + struct i2c_client *client = i2c_verify_client(dev); struct i2c_driver *driver; - if (!dev->driver) + if (!client || !dev->driver) return 0; driver = to_i2c_driver(dev->driver); if (!driver->suspend) return 0; - return driver->suspend(to_i2c_client(dev), mesg); + return driver->suspend(client, mesg); } static int i2c_device_resume(struct device *dev) { + struct i2c_client *client = i2c_verify_client(dev); struct i2c_driver *driver; - if (!dev->driver) + if (!client || !dev->driver) return 0; driver = to_i2c_driver(dev->driver); if (!driver->resume) return 0; - return driver->resume(to_i2c_client(dev)); + return driver->resume(client); } static void i2c_client_dev_release(struct device *dev) @@ -175,10 +187,10 @@ static void i2c_client_dev_release(struct device *dev) } static ssize_t -show_client_name(struct device *dev, struct device_attribute *attr, char *buf) +show_name(struct device *dev, struct device_attribute *attr, char *buf) { - struct i2c_client *client = to_i2c_client(dev); - return sprintf(buf, "%s\n", client->name); + return sprintf(buf, "%s\n", dev->type == &i2c_client_type ? + to_i2c_client(dev)->name : to_i2c_adapter(dev)->name); } static ssize_t @@ -188,18 +200,28 @@ show_modalias(struct device *dev, struct device_attribute *attr, char *buf) return sprintf(buf, "%s%s\n", I2C_MODULE_PREFIX, client->name); } -static struct device_attribute i2c_dev_attrs[] = { - __ATTR(name, S_IRUGO, show_client_name, NULL), +static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); +static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL); + +static struct attribute *i2c_dev_attrs[] = { + &dev_attr_name.attr, /* modalias helps coldplug: modprobe $(cat .../modalias) */ - __ATTR(modalias, S_IRUGO, show_modalias, NULL), - { }, + &dev_attr_modalias.attr, + NULL +}; + +static struct attribute_group i2c_dev_attr_group = { + .attrs = i2c_dev_attrs, +}; + +static const struct attribute_group *i2c_dev_attr_groups[] = { + &i2c_dev_attr_group, + NULL }; struct bus_type i2c_bus_type = { .name = "i2c", - .dev_attrs = i2c_dev_attrs, .match = i2c_device_match, - .uevent = i2c_device_uevent, .probe = i2c_device_probe, .remove = i2c_device_remove, .shutdown = i2c_device_shutdown, @@ -208,6 +230,12 @@ struct bus_type i2c_bus_type = { }; EXPORT_SYMBOL_GPL(i2c_bus_type); +static struct device_type i2c_client_type = { + .groups = i2c_dev_attr_groups, + .uevent = i2c_device_uevent, + .release = i2c_client_dev_release, +}; + /** * i2c_verify_client - return parameter as i2c_client, or NULL @@ -220,7 +248,7 @@ EXPORT_SYMBOL_GPL(i2c_bus_type); */ struct i2c_client *i2c_verify_client(struct device *dev) { - return (dev->bus == &i2c_bus_type) + return (dev->type == &i2c_client_type) ? to_i2c_client(dev) : NULL; } @@ -273,7 +301,7 @@ i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info) client->dev.parent = &client->adapter->dev; client->dev.bus = &i2c_bus_type; - client->dev.release = i2c_client_dev_release; + client->dev.type = &i2c_client_type; dev_set_name(&client->dev, "%d-%04x", i2c_adapter_id(adap), client->addr); @@ -368,13 +396,6 @@ static void i2c_adapter_dev_release(struct device *dev) complete(&adap->dev_released); } -static ssize_t -show_adapter_name(struct device *dev, struct device_attribute *attr, char *buf) -{ - struct i2c_adapter *adap = to_i2c_adapter(dev); - return sprintf(buf, "%s\n", adap->name); -} - /* * Let users instantiate I2C devices through sysfs. This can be used when * platform initialization code doesn't contain the proper data for @@ -493,19 +514,34 @@ i2c_sysfs_delete_device(struct device *dev, struct device_attribute *attr, return res; } -static struct device_attribute i2c_adapter_attrs[] = { - __ATTR(name, S_IRUGO, show_adapter_name, NULL), - __ATTR(new_device, S_IWUSR, NULL, i2c_sysfs_new_device), - __ATTR(delete_device, S_IWUSR, NULL, i2c_sysfs_delete_device), - { }, +static DEVICE_ATTR(new_device, S_IWUSR, NULL, i2c_sysfs_new_device); +static DEVICE_ATTR(delete_device, S_IWUSR, NULL, i2c_sysfs_delete_device); + +static struct attribute *i2c_adapter_attrs[] = { + &dev_attr_name.attr, + &dev_attr_new_device.attr, + &dev_attr_delete_device.attr, + NULL +}; + +static struct attribute_group i2c_adapter_attr_group = { + .attrs = i2c_adapter_attrs, }; -static struct class i2c_adapter_class = { - .owner = THIS_MODULE, - .name = "i2c-adapter", - .dev_attrs = i2c_adapter_attrs, +static const struct attribute_group *i2c_adapter_attr_groups[] = { + &i2c_adapter_attr_group, + NULL }; +static struct device_type i2c_adapter_type = { + .groups = i2c_adapter_attr_groups, + .release = i2c_adapter_dev_release, +}; + +#ifdef CONFIG_I2C_COMPAT +static struct class_compat *i2c_adapter_compat_class; +#endif + static void i2c_scan_static_board_info(struct i2c_adapter *adapter) { struct i2c_devinfo *devinfo; @@ -555,14 +591,22 @@ static int i2c_register_adapter(struct i2c_adapter *adap) adap->timeout = HZ; dev_set_name(&adap->dev, "i2c-%d", adap->nr); - adap->dev.release = &i2c_adapter_dev_release; - adap->dev.class = &i2c_adapter_class; + adap->dev.bus = &i2c_bus_type; + adap->dev.type = &i2c_adapter_type; res = device_register(&adap->dev); if (res) goto out_list; dev_dbg(&adap->dev, "adapter [%s] registered\n", adap->name); +#ifdef CONFIG_I2C_COMPAT + res = class_compat_create_link(i2c_adapter_compat_class, &adap->dev, + adap->dev.parent); + if (res) + dev_warn(&adap->dev, + "Failed to create compatibility class link\n"); +#endif + /* create pre-declared device nodes */ if (adap->nr < __i2c_first_dynamic_bus_num) i2c_scan_static_board_info(adap); @@ -718,6 +762,7 @@ int i2c_del_adapter(struct i2c_adapter *adap) { int res = 0; struct i2c_adapter *found; + struct i2c_client *client, *next; /* First make sure that this adapter was ever added */ mutex_lock(&core_lock); @@ -737,10 +782,25 @@ int i2c_del_adapter(struct i2c_adapter *adap) if (res) return res; + /* Remove devices instantiated from sysfs */ + list_for_each_entry_safe(client, next, &userspace_devices, detected) { + if (client->adapter == adap) { + dev_dbg(&adap->dev, "Removing %s at 0x%x\n", + client->name, client->addr); + list_del(&client->detected); + i2c_unregister_device(client); + } + } + /* Detach any active clients. This can't fail, thus we do not checking the returned value. */ res = device_for_each_child(&adap->dev, NULL, __unregister_client); +#ifdef CONFIG_I2C_COMPAT + class_compat_remove_link(i2c_adapter_compat_class, &adap->dev, + adap->dev.parent); +#endif + /* clean up the sysfs representation */ init_completion(&adap->dev_released); device_unregister(&adap->dev); @@ -768,9 +828,13 @@ EXPORT_SYMBOL(i2c_del_adapter); static int __attach_adapter(struct device *dev, void *data) { - struct i2c_adapter *adapter = to_i2c_adapter(dev); + struct i2c_adapter *adapter; struct i2c_driver *driver = data; + if (dev->type != &i2c_adapter_type) + return 0; + adapter = to_i2c_adapter(dev); + i2c_detect(adapter, driver); /* Legacy drivers scan i2c busses directly */ @@ -809,8 +873,7 @@ int i2c_register_driver(struct module *owner, struct i2c_driver *driver) INIT_LIST_HEAD(&driver->clients); /* Walk the adapters that are already present */ mutex_lock(&core_lock); - class_for_each_device(&i2c_adapter_class, NULL, driver, - __attach_adapter); + bus_for_each_dev(&i2c_bus_type, NULL, driver, __attach_adapter); mutex_unlock(&core_lock); return 0; @@ -819,10 +882,14 @@ EXPORT_SYMBOL(i2c_register_driver); static int __detach_adapter(struct device *dev, void *data) { - struct i2c_adapter *adapter = to_i2c_adapter(dev); + struct i2c_adapter *adapter; struct i2c_driver *driver = data; struct i2c_client *client, *_n; + if (dev->type != &i2c_adapter_type) + return 0; + adapter = to_i2c_adapter(dev); + /* Remove the devices we created ourselves as the result of hardware * probing (using a driver's detect method) */ list_for_each_entry_safe(client, _n, &driver->clients, detected) { @@ -850,8 +917,7 @@ static int __detach_adapter(struct device *dev, void *data) void i2c_del_driver(struct i2c_driver *driver) { mutex_lock(&core_lock); - class_for_each_device(&i2c_adapter_class, NULL, driver, - __detach_adapter); + bus_for_each_dev(&i2c_bus_type, NULL, driver, __detach_adapter); mutex_unlock(&core_lock); driver_unregister(&driver->driver); @@ -940,17 +1006,23 @@ static int __init i2c_init(void) retval = bus_register(&i2c_bus_type); if (retval) return retval; - retval = class_register(&i2c_adapter_class); - if (retval) +#ifdef CONFIG_I2C_COMPAT + i2c_adapter_compat_class = class_compat_register("i2c-adapter"); + if (!i2c_adapter_compat_class) { + retval = -ENOMEM; goto bus_err; + } +#endif retval = i2c_add_driver(&dummy_driver); if (retval) goto class_err; return 0; class_err: - class_unregister(&i2c_adapter_class); +#ifdef CONFIG_I2C_COMPAT + class_compat_unregister(i2c_adapter_compat_class); bus_err: +#endif bus_unregister(&i2c_bus_type); return retval; } @@ -958,7 +1030,9 @@ bus_err: static void __exit i2c_exit(void) { i2c_del_driver(&dummy_driver); - class_unregister(&i2c_adapter_class); +#ifdef CONFIG_I2C_COMPAT + class_compat_unregister(i2c_adapter_compat_class); +#endif bus_unregister(&i2c_bus_type); } |