diff options
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/i2c-boardinfo.c | 7 | ||||
| -rw-r--r-- | drivers/i2c/i2c-core.c | 557 | ||||
| -rw-r--r-- | drivers/i2c/i2c-core.h | 4 |
3 files changed, 205 insertions, 363 deletions
diff --git a/drivers/i2c/i2c-boardinfo.c b/drivers/i2c/i2c-boardinfo.c index ffb35f09df03..a26a34a06641 100644 --- a/drivers/i2c/i2c-boardinfo.c +++ b/drivers/i2c/i2c-boardinfo.c @@ -18,6 +18,7 @@ #include <linux/kernel.h> #include <linux/i2c.h> +#include <linux/rwsem.h> #include "i2c-core.h" @@ -25,7 +26,7 @@ /* These symbols are exported ONLY FOR the i2c core. * No other users will be supported. */ -DEFINE_MUTEX(__i2c_board_lock); +DECLARE_RWSEM(__i2c_board_lock); EXPORT_SYMBOL_GPL(__i2c_board_lock); LIST_HEAD(__i2c_board_list); @@ -63,7 +64,7 @@ i2c_register_board_info(int busnum, { int status; - mutex_lock(&__i2c_board_lock); + down_write(&__i2c_board_lock); /* dynamic bus numbers will be assigned after the last static one */ if (busnum >= __i2c_first_dynamic_bus_num) @@ -84,7 +85,7 @@ i2c_register_board_info(int busnum, list_add_tail(&devinfo->list, &__i2c_board_list); } - mutex_unlock(&__i2c_board_lock); + up_write(&__i2c_board_lock); return status; } diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c index 5ed622ee65c3..0e45c296d3d2 100644 --- a/drivers/i2c/i2c-core.c +++ b/drivers/i2c/i2c-core.c @@ -33,16 +33,20 @@ #include <linux/completion.h> #include <linux/hardirq.h> #include <linux/irqflags.h> +#include <linux/rwsem.h> #include <asm/uaccess.h> #include "i2c-core.h" +/* core_lock protects i2c_adapter_idr, userspace_devices, and guarantees + that device detection, deletion of detected devices, and attach_adapter + and detach_adapter calls are serialized */ static DEFINE_MUTEX(core_lock); static DEFINE_IDR(i2c_adapter_idr); +static LIST_HEAD(userspace_devices); -#define is_newstyle_driver(d) ((d)->probe || (d)->remove || (d)->detect) - +static int i2c_check_addr(struct i2c_adapter *adapter, int addr); static int i2c_detect(struct i2c_adapter *adapter, struct i2c_driver *driver); /* ------------------------------------------------------------------------- */ @@ -63,12 +67,6 @@ 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); - /* make legacy i2c drivers bypass driver model probing entirely; - * such drivers scan each i2c adapter/bus themselves. - */ - if (!is_newstyle_driver(driver)) - return 0; - /* match on an id table if there is one */ if (driver->id_table) return i2c_match_id(driver->id_table, client) != NULL; @@ -83,10 +81,6 @@ static int i2c_device_uevent(struct device *dev, struct kobj_uevent_env *env) { struct i2c_client *client = to_i2c_client(dev); - /* by definition, legacy drivers can't hotplug */ - if (dev->driver) - return 0; - if (add_uevent_var(env, "MODALIAS=%s%s", I2C_MODULE_PREFIX, client->name)) return -ENOMEM; @@ -175,12 +169,6 @@ static int i2c_device_resume(struct device *dev) return driver->resume(to_i2c_client(dev)); } -static void i2c_client_release(struct device *dev) -{ - struct i2c_client *client = to_i2c_client(dev); - complete(&client->released); -} - static void i2c_client_dev_release(struct device *dev) { kfree(to_i2c_client(dev)); @@ -240,15 +228,17 @@ EXPORT_SYMBOL(i2c_verify_client); /** - * i2c_new_device - instantiate an i2c device for use with a new style driver + * i2c_new_device - instantiate an i2c device * @adap: the adapter managing the device * @info: describes one I2C device; bus_num is ignored * Context: can sleep * - * Create a device to work with a new style i2c driver, where binding is - * handled through driver model probe()/remove() methods. This call is not - * appropriate for use by mainboad initialization logic, which usually runs - * during an arch_initcall() long before any i2c_adapter could exist. + * Create an i2c device. Binding is handled through driver model + * probe()/remove() methods. A driver may be bound to this device when we + * return from this function, or any later moment (e.g. maybe hotplugging will + * load the driver module). This call is not appropriate for use by mainboard + * initialization logic, which usually runs during an arch_initcall() long + * before any i2c_adapter could exist. * * This returns the new i2c client, which may be saved for later use with * i2c_unregister_device(); or NULL to indicate an error. @@ -276,17 +266,31 @@ i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info) strlcpy(client->name, info->type, sizeof(client->name)); - /* a new style driver may be bound to this device when we - * return from this function, or any later moment (e.g. maybe - * hotplugging will load the driver module). and the device - * refcount model is the standard driver model one. - */ - status = i2c_attach_client(client); - if (status < 0) { - kfree(client); - client = NULL; - } + /* Check for address business */ + status = i2c_check_addr(adap, client->addr); + if (status) + goto out_err; + + client->dev.parent = &client->adapter->dev; + client->dev.bus = &i2c_bus_type; + client->dev.release = i2c_client_dev_release; + + dev_set_name(&client->dev, "%d-%04x", i2c_adapter_id(adap), + client->addr); + status = device_register(&client->dev); + if (status) + goto out_err; + + dev_dbg(&adap->dev, "client [%s] registered with bus id %s\n", + client->name, dev_name(&client->dev)); + return client; + +out_err: + dev_err(&adap->dev, "Failed to register i2c client %s at 0x%02x " + "(%d)\n", client->name, client->addr, status); + kfree(client); + return NULL; } EXPORT_SYMBOL_GPL(i2c_new_device); @@ -298,28 +302,6 @@ EXPORT_SYMBOL_GPL(i2c_new_device); */ void i2c_unregister_device(struct i2c_client *client) { - struct i2c_adapter *adapter = client->adapter; - struct i2c_driver *driver = client->driver; - - if (driver && !is_newstyle_driver(driver)) { - dev_err(&client->dev, "can't unregister devices " - "with legacy drivers\n"); - WARN_ON(1); - return; - } - - if (adapter->client_unregister) { - if (adapter->client_unregister(client)) { - dev_warn(&client->dev, - "client_unregister [%s] failed\n", - client->name); - } - } - - mutex_lock(&adapter->clist_lock); - list_del(&client->list); - mutex_unlock(&adapter->clist_lock); - device_unregister(&client->dev); } EXPORT_SYMBOL_GPL(i2c_unregister_device); @@ -393,8 +375,128 @@ show_adapter_name(struct device *dev, struct device_attribute *attr, char *buf) 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 + * whatever reason. Also useful for drivers that do device detection and + * detection fails, either because the device uses an unexpected address, + * or this is a compatible device with different ID register values. + * + * Parameter checking may look overzealous, but we really don't want + * the user to provide incorrect parameters. + */ +static ssize_t +i2c_sysfs_new_device(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct i2c_adapter *adap = to_i2c_adapter(dev); + struct i2c_board_info info; + struct i2c_client *client; + char *blank, end; + int res; + + dev_warn(dev, "The new_device interface is still experimental " + "and may change in a near future\n"); + memset(&info, 0, sizeof(struct i2c_board_info)); + + blank = strchr(buf, ' '); + if (!blank) { + dev_err(dev, "%s: Missing parameters\n", "new_device"); + return -EINVAL; + } + if (blank - buf > I2C_NAME_SIZE - 1) { + dev_err(dev, "%s: Invalid device name\n", "new_device"); + return -EINVAL; + } + memcpy(info.type, buf, blank - buf); + + /* Parse remaining parameters, reject extra parameters */ + res = sscanf(++blank, "%hi%c", &info.addr, &end); + if (res < 1) { + dev_err(dev, "%s: Can't parse I2C address\n", "new_device"); + return -EINVAL; + } + if (res > 1 && end != '\n') { + dev_err(dev, "%s: Extra parameters\n", "new_device"); + return -EINVAL; + } + + if (info.addr < 0x03 || info.addr > 0x77) { + dev_err(dev, "%s: Invalid I2C address 0x%hx\n", "new_device", + info.addr); + return -EINVAL; + } + + client = i2c_new_device(adap, &info); + if (!client) + return -EEXIST; + + /* Keep track of the added device */ + mutex_lock(&core_lock); + list_add_tail(&client->detected, &userspace_devices); + mutex_unlock(&core_lock); + dev_info(dev, "%s: Instantiated device %s at 0x%02hx\n", "new_device", + info.type, info.addr); + + return count; +} + +/* + * And of course let the users delete the devices they instantiated, if + * they got it wrong. This interface can only be used to delete devices + * instantiated by i2c_sysfs_new_device above. This guarantees that we + * don't delete devices to which some kernel code still has references. + * + * Parameter checking may look overzealous, but we really don't want + * the user to delete the wrong device. + */ +static ssize_t +i2c_sysfs_delete_device(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct i2c_adapter *adap = to_i2c_adapter(dev); + struct i2c_client *client, *next; + unsigned short addr; + char end; + int res; + + /* Parse parameters, reject extra parameters */ + res = sscanf(buf, "%hi%c", &addr, &end); + if (res < 1) { + dev_err(dev, "%s: Can't parse I2C address\n", "delete_device"); + return -EINVAL; + } + if (res > 1 && end != '\n') { + dev_err(dev, "%s: Extra parameters\n", "delete_device"); + return -EINVAL; + } + + /* Make sure the device was added through sysfs */ + res = -ENOENT; + mutex_lock(&core_lock); + list_for_each_entry_safe(client, next, &userspace_devices, detected) { + if (client->addr == addr && client->adapter == adap) { + dev_info(dev, "%s: Deleting device %s at 0x%02hx\n", + "delete_device", client->name, client->addr); + + list_del(&client->detected); + i2c_unregister_device(client); + res = count; + break; + } + } + mutex_unlock(&core_lock); + + if (res < 0) + dev_err(dev, "%s: Can't find device in list\n", + "delete_device"); + 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), { }, }; @@ -408,7 +510,7 @@ static void i2c_scan_static_board_info(struct i2c_adapter *adapter) { struct i2c_devinfo *devinfo; - mutex_lock(&__i2c_board_lock); + down_read(&__i2c_board_lock); list_for_each_entry(devinfo, &__i2c_board_list, list) { if (devinfo->busnum == adapter->nr && !i2c_new_device(adapter, @@ -417,7 +519,7 @@ static void i2c_scan_static_board_info(struct i2c_adapter *adapter) "Can't create device at 0x%02x\n", devinfo->board_info.addr); } - mutex_unlock(&__i2c_board_lock); + up_read(&__i2c_board_lock); } static int i2c_do_add_adapter(struct device_driver *d, void *data) @@ -441,14 +543,12 @@ static int i2c_register_adapter(struct i2c_adapter *adap) int res = 0, dummy; /* Can't register until after driver model init */ - if (unlikely(WARN_ON(!i2c_bus_type.p))) - return -EAGAIN; + if (unlikely(WARN_ON(!i2c_bus_type.p))) { + res = -EAGAIN; + goto out_list; + } mutex_init(&adap->bus_lock); - mutex_init(&adap->clist_lock); - INIT_LIST_HEAD(&adap->clients); - - mutex_lock(&core_lock); /* Set default timeout to 1 second if not already set */ if (adap->timeout == 0) @@ -463,21 +563,23 @@ static int i2c_register_adapter(struct i2c_adapter *adap) dev_dbg(&adap->dev, "adapter [%s] registered\n", adap->name); - /* create pre-declared device nodes for new-style drivers */ + /* create pre-declared device nodes */ if (adap->nr < __i2c_first_dynamic_bus_num) i2c_scan_static_board_info(adap); /* Notify drivers */ + mutex_lock(&core_lock); dummy = bus_for_each_drv(&i2c_bus_type, NULL, adap, i2c_do_add_adapter); - -out_unlock: mutex_unlock(&core_lock); - return res; + + return 0; out_list: + mutex_lock(&core_lock); idr_remove(&i2c_adapter_idr, adap->nr); - goto out_unlock; + mutex_unlock(&core_lock); + return res; } /** @@ -596,6 +698,14 @@ static int i2c_do_del_adapter(struct device_driver *d, void *data) return res; } +static int __unregister_client(struct device *dev, void *dummy) +{ + struct i2c_client *client = i2c_verify_client(dev); + if (client) + i2c_unregister_device(client); + return 0; +} + /** * i2c_del_adapter - unregister I2C adapter * @adap: the adapter being unregistered @@ -606,46 +716,30 @@ static int i2c_do_del_adapter(struct device_driver *d, void *data) */ int i2c_del_adapter(struct i2c_adapter *adap) { - struct i2c_client *client, *_n; int res = 0; - - mutex_lock(&core_lock); + struct i2c_adapter *found; /* First make sure that this adapter was ever added */ - if (idr_find(&i2c_adapter_idr, adap->nr) != adap) { + mutex_lock(&core_lock); + found = idr_find(&i2c_adapter_idr, adap->nr); + mutex_unlock(&core_lock); + if (found != adap) { pr_debug("i2c-core: attempting to delete unregistered " "adapter [%s]\n", adap->name); - res = -EINVAL; - goto out_unlock; + return -EINVAL; } /* Tell drivers about this removal */ + mutex_lock(&core_lock); res = bus_for_each_drv(&i2c_bus_type, NULL, adap, i2c_do_del_adapter); + mutex_unlock(&core_lock); if (res) - goto out_unlock; - - /* detach any active clients. This must be done first, because - * it can fail; in which case we give up. */ - list_for_each_entry_safe_reverse(client, _n, &adap->clients, list) { - struct i2c_driver *driver; - - driver = client->driver; - - /* new style, follow standard driver model */ - if (!driver || is_newstyle_driver(driver)) { - i2c_unregister_device(client); - continue; - } + return res; - /* legacy drivers create and remove clients themselves */ - if ((res = driver->detach_client(client))) { - dev_err(&adap->dev, "detach_client failed for client " - "[%s] at address 0x%02x\n", client->name, - client->addr); - goto out_unlock; - } - } + /* 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); /* clean up the sysfs representation */ init_completion(&adap->dev_released); @@ -655,7 +749,9 @@ int i2c_del_adapter(struct i2c_adapter *adap) wait_for_completion(&adap->dev_released); /* free bus id */ + mutex_lock(&core_lock); idr_remove(&i2c_adapter_idr, adap->nr); + mutex_unlock(&core_lock); dev_dbg(&adap->dev, "adapter [%s] unregistered\n", adap->name); @@ -663,9 +759,7 @@ int i2c_del_adapter(struct i2c_adapter *adap) added again */ memset(&adap->dev, 0, sizeof(adap->dev)); - out_unlock: - mutex_unlock(&core_lock); - return res; + return 0; } EXPORT_SYMBOL(i2c_del_adapter); @@ -688,11 +782,7 @@ static int __attach_adapter(struct device *dev, void *data) /* * An i2c_driver is used with one or more i2c_client (device) nodes to access - * i2c slave chips, on a bus instance associated with some i2c_adapter. There - * are two models for binding the driver to its device: "new style" drivers - * follow the standard Linux driver model and just respond to probe() calls - * issued if the driver core sees they match(); "legacy" drivers create device - * nodes themselves. + * i2c slave chips, on a bus instance associated with some i2c_adapter. */ int i2c_register_driver(struct module *owner, struct i2c_driver *driver) @@ -703,37 +793,26 @@ int i2c_register_driver(struct module *owner, struct i2c_driver *driver) if (unlikely(WARN_ON(!i2c_bus_type.p))) return -EAGAIN; - /* new style driver methods can't mix with legacy ones */ - if (is_newstyle_driver(driver)) { - if (driver->detach_adapter || driver->detach_client) { - printk(KERN_WARNING - "i2c-core: driver [%s] is confused\n", - driver->driver.name); - return -EINVAL; - } - } - /* add the driver to the list of i2c drivers in the driver core */ driver->driver.owner = owner; driver->driver.bus = &i2c_bus_type; - /* for new style drivers, when registration returns the driver core + /* When registration returns, the driver core * will have called probe() for all matching-but-unbound devices. */ res = driver_register(&driver->driver); if (res) return res; - mutex_lock(&core_lock); - pr_debug("i2c-core: driver [%s] registered\n", driver->driver.name); 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); - mutex_unlock(&core_lock); + return 0; } EXPORT_SYMBOL(i2c_register_driver); @@ -753,32 +832,11 @@ static int __detach_adapter(struct device *dev, void *data) i2c_unregister_device(client); } - if (is_newstyle_driver(driver)) - return 0; - - /* Have a look at each adapter, if clients of this driver are still - * attached. If so, detach them to be able to kill the driver - * afterwards. - */ if (driver->detach_adapter) { if (driver->detach_adapter(adapter)) dev_err(&adapter->dev, "detach_adapter failed for driver [%s]\n", driver->driver.name); - } else { - struct i2c_client *client, *_n; - - list_for_each_entry_safe(client, _n, &adapter->clients, list) { - if (client->driver != driver) - continue; - dev_dbg(&adapter->dev, - "detaching client [%s] at 0x%02x\n", - client->name, client->addr); - if (driver->detach_client(client)) - dev_err(&adapter->dev, "detach_client " - "failed for client [%s] at 0x%02x\n", - client->name, client->addr); - } } return 0; @@ -792,14 +850,12 @@ 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); + mutex_unlock(&core_lock); driver_unregister(&driver->driver); pr_debug("i2c-core: driver [%s] unregistered\n", driver->driver.name); - - mutex_unlock(&core_lock); } EXPORT_SYMBOL(i2c_del_driver); @@ -820,86 +876,6 @@ static int i2c_check_addr(struct i2c_adapter *adapter, int addr) return device_for_each_child(&adapter->dev, &addr, __i2c_check_addr); } -int i2c_attach_client(struct i2c_client *client) -{ - struct i2c_adapter *adapter = client->adapter; - int res; - - /* Check for address business */ - res = i2c_check_addr(adapter, client->addr); - if (res) - return res; - - client->dev.parent = &client->adapter->dev; - client->dev.bus = &i2c_bus_type; - - if (client->driver) - client->dev.driver = &client->driver->driver; - - if (client->driver && !is_newstyle_driver(client->driver)) { - client->dev.release = i2c_client_release; - dev_set_uevent_suppress(&client->dev, 1); - } else - client->dev.release = i2c_client_dev_release; - - dev_set_name(&client->dev, "%d-%04x", i2c_adapter_id(adapter), - client->addr); - res = device_register(&client->dev); - if (res) - goto out_err; - - mutex_lock(&adapter->clist_lock); - list_add_tail(&client->list, &adapter->clients); - mutex_unlock(&adapter->clist_lock); - - dev_dbg(&adapter->dev, "client [%s] registered with bus id %s\n", - client->name, dev_name(&client->dev)); - - if (adapter->client_register) { - if (adapter->client_register(client)) { - dev_dbg(&adapter->dev, "client_register " - "failed for client [%s] at 0x%02x\n", - client->name, client->addr); - } - } - - return 0; - -out_err: - dev_err(&adapter->dev, "Failed to attach i2c client %s at 0x%02x " - "(%d)\n", client->name, client->addr, res); - return res; -} -EXPORT_SYMBOL(i2c_attach_client); - -int i2c_detach_client(struct i2c_client *client) -{ - struct i2c_adapter *adapter = client->adapter; - int res = 0; - - if (adapter->client_unregister) { - res = adapter->client_unregister(client); - if (res) { - dev_err(&client->dev, - "client_unregister [%s] failed, " - "client not detached\n", client->name); - goto out; - } - } - - mutex_lock(&adapter->clist_lock); - list_del(&client->list); - mutex_unlock(&adapter->clist_lock); - - init_completion(&client->released); - device_unregister(&client->dev); - wait_for_completion(&client->released); - - out: - return res; -} -EXPORT_SYMBOL(i2c_detach_client); - /** * i2c_use_client - increments the reference count of the i2c client structure * @client: the client being referenced @@ -1129,144 +1105,7 @@ EXPORT_SYMBOL(i2c_master_recv); * Will not work for 10-bit addresses! * ---------------------------------------------------- */ -static int i2c_probe_address(struct i2c_adapter *adapter, int addr, int kind, - int (*found_proc) (struct i2c_adapter *, int, int)) -{ - int err; - - /* Make sure the address is valid */ - if (addr < 0x03 || addr > 0x77) { - dev_warn(&adapter->dev, "Invalid probe address 0x%02x\n", - addr); - return -EINVAL; - } - - /* Skip if already in use */ - if (i2c_check_addr(adapter, addr)) - return 0; - - /* Make sure there is something at this address, unless forced */ - if (kind < 0) { - if (i2c_smbus_xfer(adapter, addr, 0, 0, 0, - I2C_SMBUS_QUICK, NULL) < 0) - return 0; - - /* prevent 24RF08 corruption */ - if ((addr & ~0x0f) == 0x50) - i2c_smbus_xfer(adapter, addr, 0, 0, 0, - I2C_SMBUS_QUICK, NULL); - } - - /* Finally call the custom detection function */ - err = found_proc(adapter, addr, kind); - /* -ENODEV can be returned if there is a chip at the given address - but it isn't supported by this chip driver. We catch it here as - this isn't an error. */ - if (err == -ENODEV) - err = 0; - - if (err) - dev_warn(&adapter->dev, "Client creation failed at 0x%x (%d)\n", - addr, err); - return err; -} - -int i2c_probe(struct i2c_adapter *adapter, - const struct i2c_client_address_data *address_data, - int (*found_proc) (struct i2c_adapter *, int, int)) -{ - int i, err; - int adap_id = i2c_adapter_id(adapter); - - /* Force entries are done first, and are not affected by ignore - entries */ - if (address_data->forces) { - const unsigned short * const *forces = address_data->forces; - int kind; - - for (kind = 0; forces[kind]; kind++) { - for (i = 0; forces[kind][i] != I2C_CLIENT_END; - i += 2) { - if (forces[kind][i] == adap_id - || forces[kind][i] == ANY_I2C_BUS) { - dev_dbg(&adapter->dev, "found force " - "parameter for adapter %d, " - "addr 0x%02x, kind %d\n", - adap_id, forces[kind][i + 1], - kind); - err = i2c_probe_address(adapter, - forces[kind][i + 1], - kind, found_proc); - if (err) - return err; - } - } - } - } - - /* Stop here if we can't use SMBUS_QUICK */ - if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_QUICK)) { - if (address_data->probe[0] == I2C_CLIENT_END - && address_data->normal_i2c[0] == I2C_CLIENT_END) - return 0; - - dev_dbg(&adapter->dev, "SMBus Quick command not supported, " - "can't probe for chips\n"); - return -EOPNOTSUPP; - } - - /* Probe entries are done second, and are not affected by ignore - entries either */ - for (i = 0; address_data->probe[i] != I2C_CLIENT_END; i += 2) { - if (address_data->probe[i] == adap_id - || address_data->probe[i] == ANY_I2C_BUS) { - dev_dbg(&adapter->dev, "found probe parameter for " - "adapter %d, addr 0x%02x\n", adap_id, - address_data->probe[i + 1]); - err = i2c_probe_address(adapter, - address_data->probe[i + 1], - -1, found_proc); - if (err) - return err; - } - } - - /* Normal entries are done last, unless shadowed by an ignore entry */ - for (i = 0; address_data->normal_i2c[i] != I2C_CLIENT_END; i += 1) { - int j, ignore; - - ignore = 0; - for (j = 0; address_data->ignore[j] != I2C_CLIENT_END; - j += 2) { - if ((address_data->ignore[j] == adap_id || - address_data->ignore[j] == ANY_I2C_BUS) - && address_data->ignore[j + 1] - == address_data->normal_i2c[i]) { - dev_dbg(&adapter->dev, "found ignore " - "parameter for adapter %d, " - "addr 0x%02x\n", adap_id, - address_data->ignore[j + 1]); - ignore = 1; - break; - } - } - if (ignore) - continue; - - dev_dbg(&adapter->dev, "found normal entry for adapter %d, " - "addr 0x%02x\n", adap_id, - address_data->normal_i2c[i]); - err = i2c_probe_address(adapter, address_data->normal_i2c[i], - -1, found_proc); - if (err) - return err; - } - - return 0; -} -EXPORT_SYMBOL(i2c_probe); -/* Separate detection function for new-style drivers */ static int i2c_detect_address(struct i2c_client *temp_client, int kind, struct i2c_driver *driver) { diff --git a/drivers/i2c/i2c-core.h b/drivers/i2c/i2c-core.h index cd5bff874855..9f9c57ff6708 100644 --- a/drivers/i2c/i2c-core.h +++ b/drivers/i2c/i2c-core.h @@ -16,6 +16,8 @@ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ +#include <linux/rwsem.h> + struct i2c_devinfo { struct list_head list; int busnum; @@ -25,7 +27,7 @@ struct i2c_devinfo { /* board_lock protects board_list and first_dynamic_bus_num. * only i2c core components are allowed to use these symbols. */ -extern struct mutex __i2c_board_lock; +extern struct rw_semaphore __i2c_board_lock; extern struct list_head __i2c_board_list; extern int __i2c_first_dynamic_bus_num; |