X-Git-Url: http://pilppa.org/gitweb/?a=blobdiff_plain;f=drivers%2Fi2c%2Fi2c-core.c;h=64f8e56d300ec7046ab3389ff4c53198d775b12e;hb=fabb5c4e4a474ff0f7d6c1d3466a1b79bbce5f49;hp=b05378a3d673fb67de094c3c0e4c33e9c7836d87;hpb=91f7b5c41811154706448b2bf500000cbbfa96ba;p=linux-2.6-omap-h63xx.git diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c index b05378a3d67..64f8e56d300 100644 --- a/drivers/i2c/i2c-core.c +++ b/drivers/i2c/i2c-core.c @@ -32,193 +32,333 @@ #include #include #include +#include #include +#include "i2c-core.h" + static LIST_HEAD(adapters); static LIST_HEAD(drivers); static DEFINE_MUTEX(core_lists); static DEFINE_IDR(i2c_adapter_idr); -/* match always succeeds, as we want the probe() to tell if we really accept this match */ +#define is_newstyle_driver(d) ((d)->probe || (d)->remove) + +/* ------------------------------------------------------------------------- */ + static int i2c_device_match(struct device *dev, struct device_driver *drv) { - return 1; -} + struct i2c_client *client = to_i2c_client(dev); + struct i2c_driver *driver = to_i2c_driver(drv); -static int i2c_bus_suspend(struct device * dev, pm_message_t state) -{ - int rc = 0; + /* make legacy i2c drivers bypass driver model probing entirely; + * such drivers scan each i2c adapter/bus themselves. + */ + if (!is_newstyle_driver(driver)) + return 0; - if (dev->driver && dev->driver->suspend) - rc = dev->driver->suspend(dev, state); - return rc; + /* new style drivers use the same kind of driver matching policy + * as platform devices or SPI: compare device and driver IDs. + */ + return strcmp(client->driver_name, drv->name) == 0; } -static int i2c_bus_resume(struct device * dev) +#ifdef CONFIG_HOTPLUG + +/* uevent helps with hotplug: modprobe -q $(MODALIAS) */ +static int i2c_device_uevent(struct device *dev, char **envp, int num_envp, + char *buffer, int buffer_size) { - int rc = 0; - - if (dev->driver && dev->driver->resume) - rc = dev->driver->resume(dev); - return rc; + struct i2c_client *client = to_i2c_client(dev); + int i = 0, length = 0; + + /* by definition, legacy drivers can't hotplug */ + if (dev->driver || !client->driver_name) + return 0; + + if (add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &length, + "MODALIAS=%s", client->driver_name)) + return -ENOMEM; + envp[i] = NULL; + dev_dbg(dev, "uevent\n"); + return 0; } +#else +#define i2c_device_uevent NULL +#endif /* CONFIG_HOTPLUG */ + static int i2c_device_probe(struct device *dev) { - return -ENODEV; + struct i2c_client *client = to_i2c_client(dev); + struct i2c_driver *driver = to_i2c_driver(dev->driver); + + if (!driver->probe) + return -ENODEV; + client->driver = driver; + dev_dbg(dev, "probe\n"); + return driver->probe(client); } static int i2c_device_remove(struct device *dev) { - return 0; + struct i2c_client *client = to_i2c_client(dev); + struct i2c_driver *driver; + int status; + + if (!dev->driver) + return 0; + + driver = to_i2c_driver(dev->driver); + if (driver->remove) { + dev_dbg(dev, "remove\n"); + status = driver->remove(client); + } else { + dev->driver = NULL; + status = 0; + } + if (status == 0) + client->driver = NULL; + return status; } -struct bus_type i2c_bus_type = { - .name = "i2c", - .match = i2c_device_match, - .probe = i2c_device_probe, - .remove = i2c_device_remove, - .suspend = i2c_bus_suspend, - .resume = i2c_bus_resume, -}; +static void i2c_device_shutdown(struct device *dev) +{ + struct i2c_driver *driver; -void i2c_adapter_dev_release(struct device *dev) + if (!dev->driver) + return; + driver = to_i2c_driver(dev->driver); + if (driver->shutdown) + driver->shutdown(to_i2c_client(dev)); +} + +static int i2c_device_suspend(struct device * dev, pm_message_t mesg) { - struct i2c_adapter *adap = dev_to_i2c_adapter(dev); - complete(&adap->dev_released); + struct i2c_driver *driver; + + if (!dev->driver) + return 0; + driver = to_i2c_driver(dev->driver); + if (!driver->suspend) + return 0; + return driver->suspend(to_i2c_client(dev), mesg); } -struct device_driver i2c_adapter_driver = { - .owner = THIS_MODULE, - .name = "i2c_adapter", - .bus = &i2c_bus_type, -}; +static int i2c_device_resume(struct device * dev) +{ + struct i2c_driver *driver; -/* ------------------------------------------------------------------------- */ + if (!dev->driver) + return 0; + driver = to_i2c_driver(dev->driver); + if (!driver->resume) + return 0; + return driver->resume(to_i2c_client(dev)); +} -/* I2C bus adapters -- one roots each I2C or SMBUS segment */ +static void i2c_client_release(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + complete(&client->released); +} -static void i2c_adapter_class_dev_release(struct class_device *dev) +static void i2c_client_dev_release(struct device *dev) { - struct i2c_adapter *adap = class_dev_to_i2c_adapter(dev); - complete(&adap->class_dev_released); + kfree(to_i2c_client(dev)); } -static ssize_t i2c_adapter_show_name(struct class_device *cdev, char *buf) +static ssize_t show_client_name(struct device *dev, struct device_attribute *attr, char *buf) { - struct i2c_adapter *adap = class_dev_to_i2c_adapter(cdev); - return sprintf(buf, "%s\n", adap->name); + struct i2c_client *client = to_i2c_client(dev); + return sprintf(buf, "%s\n", client->name); } -static struct class_device_attribute i2c_adapter_attrs[] = { - __ATTR(name, S_IRUGO, i2c_adapter_show_name, NULL), +static ssize_t show_modalias(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct i2c_client *client = to_i2c_client(dev); + return client->driver_name + ? sprintf(buf, "%s\n", client->driver_name) + : 0; +} + +static struct device_attribute i2c_dev_attrs[] = { + __ATTR(name, S_IRUGO, show_client_name, NULL), + /* modalias helps coldplug: modprobe $(cat .../modalias) */ + __ATTR(modalias, S_IRUGO, show_modalias, NULL), { }, }; -struct class i2c_adapter_class = { - .owner = THIS_MODULE, - .name = "i2c-adapter", - .class_dev_attrs = i2c_adapter_attrs, - .release = &i2c_adapter_class_dev_release, +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, + .suspend = i2c_device_suspend, + .resume = i2c_device_resume, }; +EXPORT_SYMBOL_GPL(i2c_bus_type); -static ssize_t show_adapter_name(struct device *dev, struct device_attribute *attr, char *buf) +/** + * i2c_new_device - instantiate an i2c device for use with a new style driver + * @adap: the adapter managing the device + * @info: describes one I2C device; bus_num is ignored + * + * 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. + * + * This returns the new i2c client, which may be saved for later use with + * i2c_unregister_device(); or NULL to indicate an error. + */ +struct i2c_client * +i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info) { - struct i2c_adapter *adap = dev_to_i2c_adapter(dev); - return sprintf(buf, "%s\n", adap->name); -} -static DEVICE_ATTR(name, S_IRUGO, show_adapter_name, NULL); + struct i2c_client *client; + int status; + client = kzalloc(sizeof *client, GFP_KERNEL); + if (!client) + return NULL; -static void i2c_client_release(struct device *dev) -{ - struct i2c_client *client = to_i2c_client(dev); - complete(&client->released); + client->adapter = adap; + + client->dev.platform_data = info->platform_data; + client->flags = info->flags; + client->addr = info->addr; + client->irq = info->irq; + + strlcpy(client->driver_name, info->driver_name, + sizeof(client->driver_name)); + 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; + } + return client; } +EXPORT_SYMBOL_GPL(i2c_new_device); -static ssize_t show_client_name(struct device *dev, struct device_attribute *attr, char *buf) + +/** + * i2c_unregister_device - reverse effect of i2c_new_device() + * @client: value returned from i2c_new_device() + */ +void i2c_unregister_device(struct i2c_client *client) { - struct i2c_client *client = to_i2c_client(dev); - return sprintf(buf, "%s\n", client->name); + 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; + } + + mutex_lock(&adapter->clist_lock); + list_del(&client->list); + mutex_unlock(&adapter->clist_lock); + + device_unregister(&client->dev); } +EXPORT_SYMBOL_GPL(i2c_unregister_device); -/* - * We can't use the DEVICE_ATTR() macro here, as we used the same name for - * an i2c adapter attribute (above). - */ -static struct device_attribute dev_attr_client_name = - __ATTR(name, S_IRUGO, &show_client_name, NULL); +/* ------------------------------------------------------------------------- */ -/* --------------------------------------------------- - * registering functions - * --------------------------------------------------- - */ +/* I2C bus adapters -- one roots each I2C or SMBUS segment */ -/* ----- - * i2c_add_adapter is called from within the algorithm layer, - * when a new hw adapter registers. A new device is register to be - * available for clients. - */ -int i2c_add_adapter(struct i2c_adapter *adap) +void i2c_adapter_dev_release(struct device *dev) { - int id, res = 0; - struct list_head *item; - struct i2c_driver *driver; + struct i2c_adapter *adap = to_i2c_adapter(dev); + complete(&adap->dev_released); +} +EXPORT_SYMBOL_GPL(i2c_adapter_dev_release); /* exported to i2c-isa */ - mutex_lock(&core_lists); +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); +} - if (idr_pre_get(&i2c_adapter_idr, GFP_KERNEL) == 0) { - res = -ENOMEM; - goto out_unlock; - } +static struct device_attribute i2c_adapter_attrs[] = { + __ATTR(name, S_IRUGO, show_adapter_name, NULL), + { }, +}; - res = idr_get_new(&i2c_adapter_idr, adap, &id); - if (res < 0) { - if (res == -EAGAIN) - res = -ENOMEM; - goto out_unlock; +struct class i2c_adapter_class = { + .owner = THIS_MODULE, + .name = "i2c-adapter", + .dev_attrs = i2c_adapter_attrs, +}; +EXPORT_SYMBOL_GPL(i2c_adapter_class); /* exported to i2c-isa */ + +static void i2c_scan_static_board_info(struct i2c_adapter *adapter) +{ + struct i2c_devinfo *devinfo; + + mutex_lock(&__i2c_board_lock); + list_for_each_entry(devinfo, &__i2c_board_list, list) { + if (devinfo->busnum == adapter->nr + && !i2c_new_device(adapter, + &devinfo->board_info)) + printk(KERN_ERR "i2c-core: can't create i2c%d-%04x\n", + i2c_adapter_id(adapter), + devinfo->board_info.addr); } + mutex_unlock(&__i2c_board_lock); +} + +static int i2c_register_adapter(struct i2c_adapter *adap) +{ + int res = 0; + struct list_head *item; + struct i2c_driver *driver; - adap->nr = id & MAX_ID_MASK; mutex_init(&adap->bus_lock); mutex_init(&adap->clist_lock); - list_add_tail(&adap->list,&adapters); INIT_LIST_HEAD(&adap->clients); + mutex_lock(&core_lists); + list_add_tail(&adap->list, &adapters); + /* Add the adapter to the driver core. * If the parent pointer is not set up, * we add this adapter to the host bus. */ if (adap->dev.parent == NULL) { adap->dev.parent = &platform_bus; - printk(KERN_WARNING "**WARNING** I2C adapter driver [%s] " - "forgot to specify physical device; fix it!\n", - adap->name); + pr_debug("I2C adapter driver [%s] forgot to specify " + "physical device\n", adap->name); } sprintf(adap->dev.bus_id, "i2c-%d", adap->nr); - adap->dev.driver = &i2c_adapter_driver; adap->dev.release = &i2c_adapter_dev_release; + adap->dev.class = &i2c_adapter_class; res = device_register(&adap->dev); if (res) goto out_list; - res = device_create_file(&adap->dev, &dev_attr_name); - if (res) - goto out_unregister; - - /* Add this adapter to the i2c_adapter class */ - memset(&adap->class_dev, 0x00, sizeof(struct class_device)); - adap->class_dev.dev = &adap->dev; - adap->class_dev.class = &i2c_adapter_class; - strlcpy(adap->class_dev.class_id, adap->dev.bus_id, BUS_ID_SIZE); - res = class_device_register(&adap->class_dev); - if (res) - goto out_remove_name; dev_dbg(&adap->dev, "adapter [%s] registered\n", adap->name); - /* inform drivers of new adapters */ + /* create pre-declared device nodes for new-style drivers */ + if (adap->nr < __i2c_first_dynamic_bus_num) + i2c_scan_static_board_info(adap); + + /* let legacy drivers scan this bus for matching devices */ list_for_each(item,&drivers) { driver = list_entry(item, struct i2c_driver, list); if (driver->attach_adapter) @@ -230,18 +370,98 @@ out_unlock: mutex_unlock(&core_lists); return res; -out_remove_name: - device_remove_file(&adap->dev, &dev_attr_name); -out_unregister: - init_completion(&adap->dev_released); /* Needed? */ - device_unregister(&adap->dev); - wait_for_completion(&adap->dev_released); out_list: list_del(&adap->list); idr_remove(&i2c_adapter_idr, adap->nr); goto out_unlock; } +/** + * i2c_add_adapter - declare i2c adapter, use dynamic bus number + * @adapter: the adapter to add + * + * This routine is used to declare an I2C adapter when its bus number + * doesn't matter. Examples: for I2C adapters dynamically added by + * USB links or PCI plugin cards. + * + * When this returns zero, a new bus number was allocated and stored + * in adap->nr, and the specified adapter became available for clients. + * Otherwise, a negative errno value is returned. + */ +int i2c_add_adapter(struct i2c_adapter *adapter) +{ + int id, res = 0; + +retry: + if (idr_pre_get(&i2c_adapter_idr, GFP_KERNEL) == 0) + return -ENOMEM; + + mutex_lock(&core_lists); + /* "above" here means "above or equal to", sigh */ + res = idr_get_new_above(&i2c_adapter_idr, adapter, + __i2c_first_dynamic_bus_num, &id); + mutex_unlock(&core_lists); + + if (res < 0) { + if (res == -EAGAIN) + goto retry; + return res; + } + + adapter->nr = id; + return i2c_register_adapter(adapter); +} +EXPORT_SYMBOL(i2c_add_adapter); + +/** + * i2c_add_numbered_adapter - declare i2c adapter, use static bus number + * @adap: the adapter to register (with adap->nr initialized) + * + * This routine is used to declare an I2C adapter when its bus number + * matters. Example: for I2C adapters from system-on-chip CPUs, or + * otherwise built in to the system's mainboard, and where i2c_board_info + * is used to properly configure I2C devices. + * + * If no devices have pre-been declared for this bus, then be sure to + * register the adapter before any dynamically allocated ones. Otherwise + * the required bus ID may not be available. + * + * When this returns zero, the specified adapter became available for + * clients using the bus number provided in adap->nr. Also, the table + * of I2C devices pre-declared using i2c_register_board_info() is scanned, + * and the appropriate driver model device nodes are created. Otherwise, a + * negative errno value is returned. + */ +int i2c_add_numbered_adapter(struct i2c_adapter *adap) +{ + int id; + int status; + + if (adap->nr & ~MAX_ID_MASK) + return -EINVAL; + +retry: + if (idr_pre_get(&i2c_adapter_idr, GFP_KERNEL) == 0) + return -ENOMEM; + + mutex_lock(&core_lists); + /* "above" here means "above or equal to", sigh; + * we need the "equal to" result to force the result + */ + status = idr_get_new_above(&i2c_adapter_idr, adap, adap->nr, &id); + if (status == 0 && id != adap->nr) { + status = -EBUSY; + idr_remove(&i2c_adapter_idr, id); + } + mutex_unlock(&core_lists); + if (status == -EAGAIN) + goto retry; + + if (status == 0) + status = i2c_register_adapter(adap); + return status; +} +EXPORT_SYMBOL_GPL(i2c_add_numbered_adapter); int i2c_del_adapter(struct i2c_adapter *adap) { @@ -279,9 +499,19 @@ int i2c_del_adapter(struct i2c_adapter *adap) /* detach any active clients. This must be done first, because * it can fail; in which case we give up. */ list_for_each_safe(item, _n, &adap->clients) { + struct i2c_driver *driver; + client = list_entry(item, struct i2c_client, list); + driver = client->driver; - if ((res=client->driver->detach_client(client))) { + /* new style, follow standard driver model */ + if (!driver || is_newstyle_driver(driver)) { + i2c_unregister_device(client); + continue; + } + + /* 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); @@ -291,17 +521,13 @@ int i2c_del_adapter(struct i2c_adapter *adap) /* clean up the sysfs representation */ init_completion(&adap->dev_released); - init_completion(&adap->class_dev_released); - class_device_unregister(&adap->class_dev); - device_remove_file(&adap->dev, &dev_attr_name); device_unregister(&adap->dev); list_del(&adap->list); /* wait for sysfs to drop all references */ wait_for_completion(&adap->dev_released); - wait_for_completion(&adap->class_dev_released); - /* free dynamically allocated bus id */ + /* free bus id */ idr_remove(&i2c_adapter_idr, adap->nr); dev_dbg(&adap->dev, "adapter [%s] unregistered\n", adap->name); @@ -310,24 +536,42 @@ int i2c_del_adapter(struct i2c_adapter *adap) mutex_unlock(&core_lists); return res; } +EXPORT_SYMBOL(i2c_del_adapter); -/* ----- - * What follows is the "upwards" interface: commands for talking to clients, - * which implement the functions to access the physical information of the - * chips. +/* ------------------------------------------------------------------------- */ + +/* + * 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. */ int i2c_register_driver(struct module *owner, struct i2c_driver *driver) { - struct list_head *item; - struct i2c_adapter *adapter; int res; + /* new style driver methods can't mix with legacy ones */ + if (is_newstyle_driver(driver)) { + if (driver->attach_adapter || 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 + * will have called probe() for all matching-but-unbound devices. + */ res = driver_register(&driver->driver); if (res) return res; @@ -337,10 +581,11 @@ int i2c_register_driver(struct module *owner, struct i2c_driver *driver) list_add_tail(&driver->list,&drivers); pr_debug("i2c-core: driver [%s] registered\n", driver->driver.name); - /* now look for instances of driver on our adapters */ + /* legacy drivers scan i2c busses directly */ if (driver->attach_adapter) { - list_for_each(item,&adapters) { - adapter = list_entry(item, struct i2c_adapter, list); + struct i2c_adapter *adapter; + + list_for_each_entry(adapter, &adapters, list) { driver->attach_adapter(adapter); } } @@ -350,16 +595,22 @@ int i2c_register_driver(struct module *owner, struct i2c_driver *driver) } EXPORT_SYMBOL(i2c_register_driver); -int i2c_del_driver(struct i2c_driver *driver) +/** + * i2c_del_driver - unregister I2C driver + * @driver: the driver being unregistered + */ +void i2c_del_driver(struct i2c_driver *driver) { struct list_head *item1, *item2, *_n; struct i2c_client *client; struct i2c_adapter *adap; - int res = 0; - mutex_lock(&core_lists); + /* new-style driver? */ + if (is_newstyle_driver(driver)) + goto unregister; + /* 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. @@ -367,11 +618,10 @@ int i2c_del_driver(struct i2c_driver *driver) list_for_each(item1,&adapters) { adap = list_entry(item1, struct i2c_adapter, list); if (driver->detach_adapter) { - if ((res = driver->detach_adapter(adap))) { + if (driver->detach_adapter(adap)) { dev_err(&adap->dev, "detach_adapter failed " "for driver [%s]\n", driver->driver.name); - goto out_unlock; } } else { list_for_each_safe(item2, _n, &adap->clients) { @@ -381,25 +631,26 @@ int i2c_del_driver(struct i2c_driver *driver) dev_dbg(&adap->dev, "detaching client [%s] " "at 0x%02x\n", client->name, client->addr); - if ((res = driver->detach_client(client))) { + if (driver->detach_client(client)) { dev_err(&adap->dev, "detach_client " "failed for client [%s] at " "0x%02x\n", client->name, client->addr); - goto out_unlock; } } } } + unregister: driver_unregister(&driver->driver); list_del(&driver->list); pr_debug("i2c-core: driver [%s] unregistered\n", driver->driver.name); - out_unlock: mutex_unlock(&core_lists); - return 0; } +EXPORT_SYMBOL(i2c_del_driver); + +/* ------------------------------------------------------------------------- */ static int __i2c_check_addr(struct i2c_adapter *adapter, unsigned int addr) { @@ -424,6 +675,7 @@ int i2c_check_addr(struct i2c_adapter *adapter, int addr) return rval; } +EXPORT_SYMBOL(i2c_check_addr); int i2c_attach_client(struct i2c_client *client) { @@ -440,9 +692,15 @@ int i2c_attach_client(struct i2c_client *client) client->usage_count = 0; client->dev.parent = &client->adapter->dev; - client->dev.driver = &client->driver->driver; client->dev.bus = &i2c_bus_type; - client->dev.release = &i2c_client_release; + + if (client->driver) + client->dev.driver = &client->driver->driver; + + if (client->driver && !is_newstyle_driver(client->driver)) + client->dev.release = i2c_client_release; + else + client->dev.release = i2c_client_dev_release; snprintf(&client->dev.bus_id[0], sizeof(client->dev.bus_id), "%d-%04x", i2c_adapter_id(adapter), client->addr); @@ -451,9 +709,6 @@ int i2c_attach_client(struct i2c_client *client) res = device_register(&client->dev); if (res) goto out_list; - res = device_create_file(&client->dev, &dev_attr_client_name); - if (res) - goto out_unregister; mutex_unlock(&adapter->clist_lock); if (adapter->client_register) { @@ -466,10 +721,6 @@ int i2c_attach_client(struct i2c_client *client) return 0; -out_unregister: - init_completion(&client->released); /* Needed? */ - device_unregister(&client->dev); - wait_for_completion(&client->released); out_list: list_del(&client->list); dev_err(&adapter->dev, "Failed to attach i2c client %s at 0x%02x " @@ -478,7 +729,7 @@ out_unlock: mutex_unlock(&adapter->clist_lock); return res; } - +EXPORT_SYMBOL(i2c_attach_client); int i2c_detach_client(struct i2c_client *client) { @@ -504,7 +755,6 @@ int i2c_detach_client(struct i2c_client *client) mutex_lock(&adapter->clist_lock); list_del(&client->list); init_completion(&client->released); - device_remove_file(&client->dev, &dev_attr_client_name); device_unregister(&client->dev); mutex_unlock(&adapter->clist_lock); wait_for_completion(&client->released); @@ -512,6 +762,7 @@ int i2c_detach_client(struct i2c_client *client) out: return res; } +EXPORT_SYMBOL(i2c_detach_client); static int i2c_inc_use_client(struct i2c_client *client) { @@ -544,6 +795,7 @@ int i2c_use_client(struct i2c_client *client) return 0; } +EXPORT_SYMBOL(i2c_use_client); int i2c_release_client(struct i2c_client *client) { @@ -558,6 +810,7 @@ int i2c_release_client(struct i2c_client *client) return 0; } +EXPORT_SYMBOL(i2c_release_client); void i2c_clients_command(struct i2c_adapter *adap, unsigned int cmd, void *arg) { @@ -578,15 +831,13 @@ void i2c_clients_command(struct i2c_adapter *adap, unsigned int cmd, void *arg) } mutex_unlock(&adap->clist_lock); } +EXPORT_SYMBOL(i2c_clients_command); static int __init i2c_init(void) { int retval; retval = bus_register(&i2c_bus_type); - if (retval) - return retval; - retval = driver_register(&i2c_adapter_driver); if (retval) return retval; return class_register(&i2c_adapter_class); @@ -595,7 +846,6 @@ static int __init i2c_init(void) static void __exit i2c_exit(void) { class_unregister(&i2c_adapter_class); - driver_unregister(&i2c_adapter_driver); bus_unregister(&i2c_bus_type); } @@ -615,8 +865,9 @@ int i2c_transfer(struct i2c_adapter * adap, struct i2c_msg *msgs, int num) #ifdef DEBUG for (ret = 0; ret < num; ret++) { dev_dbg(&adap->dev, "master_xfer[%d] %c, addr=0x%02x, " - "len=%d\n", ret, msgs[ret].flags & I2C_M_RD ? - 'R' : 'W', msgs[ret].addr, msgs[ret].len); + "len=%d%s\n", ret, (msgs[ret].flags & I2C_M_RD) + ? 'R' : 'W', msgs[ret].addr, msgs[ret].len, + (msgs[ret].flags & I2C_M_RECV_LEN) ? "+" : ""); } #endif @@ -630,6 +881,7 @@ int i2c_transfer(struct i2c_adapter * adap, struct i2c_msg *msgs, int num) return -ENOSYS; } } +EXPORT_SYMBOL(i2c_transfer); int i2c_master_send(struct i2c_client *client,const char *buf ,int count) { @@ -648,6 +900,7 @@ int i2c_master_send(struct i2c_client *client,const char *buf ,int count) transmitted, else error code. */ return (ret == 1) ? count : ret; } +EXPORT_SYMBOL(i2c_master_send); int i2c_master_recv(struct i2c_client *client, char *buf ,int count) { @@ -667,7 +920,7 @@ int i2c_master_recv(struct i2c_client *client, char *buf ,int count) transmitted, else error code. */ return (ret == 1) ? count : ret; } - +EXPORT_SYMBOL(i2c_master_recv); int i2c_control(struct i2c_client *client, unsigned int cmd, unsigned long arg) @@ -689,6 +942,7 @@ int i2c_control(struct i2c_client *client, } return ret; } +EXPORT_SYMBOL(i2c_control); /* ---------------------------------------------------- * the i2c address scanning function @@ -830,6 +1084,70 @@ int i2c_probe(struct i2c_adapter *adapter, return 0; } +EXPORT_SYMBOL(i2c_probe); + +struct i2c_client * +i2c_new_probed_device(struct i2c_adapter *adap, + struct i2c_board_info *info, + unsigned short const *addr_list) +{ + int i; + + /* Stop here if the bus doesn't support probing */ + if (!i2c_check_functionality(adap, I2C_FUNC_SMBUS_READ_BYTE)) { + dev_err(&adap->dev, "Probing not supported\n"); + return NULL; + } + + mutex_lock(&adap->clist_lock); + for (i = 0; addr_list[i] != I2C_CLIENT_END; i++) { + /* Check address validity */ + if (addr_list[i] < 0x03 || addr_list[i] > 0x77) { + dev_warn(&adap->dev, "Invalid 7-bit address " + "0x%02x\n", addr_list[i]); + continue; + } + + /* Check address availability */ + if (__i2c_check_addr(adap, addr_list[i])) { + dev_dbg(&adap->dev, "Address 0x%02x already in " + "use, not probing\n", addr_list[i]); + continue; + } + + /* Test address responsiveness + The default probe method is a quick write, but it is known + to corrupt the 24RF08 EEPROMs due to a state machine bug, + and could also irreversibly write-protect some EEPROMs, so + for address ranges 0x30-0x37 and 0x50-0x5f, we use a byte + read instead. Also, some bus drivers don't implement + quick write, so we fallback to a byte read it that case + too. */ + if ((addr_list[i] & ~0x07) == 0x30 + || (addr_list[i] & ~0x0f) == 0x50 + || !i2c_check_functionality(adap, I2C_FUNC_SMBUS_QUICK)) { + if (i2c_smbus_xfer(adap, addr_list[i], 0, + I2C_SMBUS_READ, 0, + I2C_SMBUS_BYTE, NULL) >= 0) + break; + } else { + if (i2c_smbus_xfer(adap, addr_list[i], 0, + I2C_SMBUS_WRITE, 0, + I2C_SMBUS_QUICK, NULL) >= 0) + break; + } + } + mutex_unlock(&adap->clist_lock); + + if (addr_list[i] == I2C_CLIENT_END) { + dev_dbg(&adap->dev, "Probing failed, no device found\n"); + return NULL; + } + + info->addr = addr_list[i]; + return i2c_new_device(adap, info); +} +EXPORT_SYMBOL_GPL(i2c_new_probed_device); struct i2c_adapter* i2c_get_adapter(int id) { @@ -843,11 +1161,13 @@ struct i2c_adapter* i2c_get_adapter(int id) mutex_unlock(&core_lists); return adapter; } +EXPORT_SYMBOL(i2c_get_adapter); void i2c_put_adapter(struct i2c_adapter *adap) { module_put(adap->owner); } +EXPORT_SYMBOL(i2c_put_adapter); /* The SMBus parts */ @@ -916,6 +1236,7 @@ s32 i2c_smbus_write_quick(struct i2c_client *client, u8 value) return i2c_smbus_xfer(client->adapter,client->addr,client->flags, value,0,I2C_SMBUS_QUICK,NULL); } +EXPORT_SYMBOL(i2c_smbus_write_quick); s32 i2c_smbus_read_byte(struct i2c_client *client) { @@ -926,12 +1247,14 @@ s32 i2c_smbus_read_byte(struct i2c_client *client) else return data.byte; } +EXPORT_SYMBOL(i2c_smbus_read_byte); s32 i2c_smbus_write_byte(struct i2c_client *client, u8 value) { return i2c_smbus_xfer(client->adapter,client->addr,client->flags, I2C_SMBUS_WRITE, value, I2C_SMBUS_BYTE, NULL); } +EXPORT_SYMBOL(i2c_smbus_write_byte); s32 i2c_smbus_read_byte_data(struct i2c_client *client, u8 command) { @@ -942,6 +1265,7 @@ s32 i2c_smbus_read_byte_data(struct i2c_client *client, u8 command) else return data.byte; } +EXPORT_SYMBOL(i2c_smbus_read_byte_data); s32 i2c_smbus_write_byte_data(struct i2c_client *client, u8 command, u8 value) { @@ -951,6 +1275,7 @@ s32 i2c_smbus_write_byte_data(struct i2c_client *client, u8 command, u8 value) I2C_SMBUS_WRITE,command, I2C_SMBUS_BYTE_DATA,&data); } +EXPORT_SYMBOL(i2c_smbus_write_byte_data); s32 i2c_smbus_read_word_data(struct i2c_client *client, u8 command) { @@ -961,6 +1286,7 @@ s32 i2c_smbus_read_word_data(struct i2c_client *client, u8 command) else return data.word; } +EXPORT_SYMBOL(i2c_smbus_read_word_data); s32 i2c_smbus_write_word_data(struct i2c_client *client, u8 command, u16 value) { @@ -970,6 +1296,23 @@ s32 i2c_smbus_write_word_data(struct i2c_client *client, u8 command, u16 value) I2C_SMBUS_WRITE,command, I2C_SMBUS_WORD_DATA,&data); } +EXPORT_SYMBOL(i2c_smbus_write_word_data); + +/* Returns the number of read bytes */ +s32 i2c_smbus_read_block_data(struct i2c_client *client, u8 command, + u8 *values) +{ + union i2c_smbus_data data; + + if (i2c_smbus_xfer(client->adapter, client->addr, client->flags, + I2C_SMBUS_READ, command, + I2C_SMBUS_BLOCK_DATA, &data)) + return -1; + + memcpy(values, &data.block[1], data.block[0]); + return data.block[0]; +} +EXPORT_SYMBOL(i2c_smbus_read_block_data); s32 i2c_smbus_write_block_data(struct i2c_client *client, u8 command, u8 length, const u8 *values) @@ -984,6 +1327,7 @@ s32 i2c_smbus_write_block_data(struct i2c_client *client, u8 command, I2C_SMBUS_WRITE,command, I2C_SMBUS_BLOCK_DATA,&data); } +EXPORT_SYMBOL(i2c_smbus_write_block_data); /* Returns the number of read bytes */ s32 i2c_smbus_read_i2c_block_data(struct i2c_client *client, u8 command, u8 *values) @@ -998,6 +1342,7 @@ s32 i2c_smbus_read_i2c_block_data(struct i2c_client *client, u8 command, u8 *val memcpy(values, &data.block[1], data.block[0]); return data.block[0]; } +EXPORT_SYMBOL(i2c_smbus_read_i2c_block_data); s32 i2c_smbus_write_i2c_block_data(struct i2c_client *client, u8 command, u8 length, const u8 *values) @@ -1012,6 +1357,7 @@ s32 i2c_smbus_write_i2c_block_data(struct i2c_client *client, u8 command, I2C_SMBUS_WRITE, command, I2C_SMBUS_I2C_BLOCK_DATA, &data); } +EXPORT_SYMBOL(i2c_smbus_write_i2c_block_data); /* Simulate a SMBus command using the i2c protocol No checking of parameters is done! */ @@ -1075,9 +1421,9 @@ static s32 i2c_smbus_xfer_emulated(struct i2c_adapter * adapter, u16 addr, break; case I2C_SMBUS_BLOCK_DATA: if (read_write == I2C_SMBUS_READ) { - dev_err(&adapter->dev, "Block read not supported " - "under I2C emulation!\n"); - return -1; + msg[1].flags |= I2C_M_RECV_LEN; + msg[1].len = 1; /* block length will be added by + the underlying bus driver */ } else { msg[0].len = data->block[0] + 2; if (msg[0].len > I2C_SMBUS_BLOCK_MAX + 2) { @@ -1091,9 +1437,21 @@ static s32 i2c_smbus_xfer_emulated(struct i2c_adapter * adapter, u16 addr, } break; case I2C_SMBUS_BLOCK_PROC_CALL: - dev_dbg(&adapter->dev, "Block process call not supported " - "under I2C emulation!\n"); - return -1; + num = 2; /* Another special case */ + read_write = I2C_SMBUS_READ; + if (data->block[0] > I2C_SMBUS_BLOCK_MAX) { + dev_err(&adapter->dev, "%s called with invalid " + "block proc call size (%d)\n", __FUNCTION__, + data->block[0]); + return -1; + } + msg[0].len = data->block[0] + 2; + for (i = 1; i < msg[0].len; i++) + msgbuf0[i] = data->block[i-1]; + msg[1].flags |= I2C_M_RECV_LEN; + msg[1].len = 1; /* block length will be added by + the underlying bus driver */ + break; case I2C_SMBUS_I2C_BLOCK_DATA: if (read_write == I2C_SMBUS_READ) { msg[1].len = I2C_SMBUS_BLOCK_MAX; @@ -1157,6 +1515,11 @@ static s32 i2c_smbus_xfer_emulated(struct i2c_adapter * adapter, u16 addr, for (i = 0; i < I2C_SMBUS_BLOCK_MAX; i++) data->block[i+1] = msgbuf1[i]; break; + case I2C_SMBUS_BLOCK_DATA: + case I2C_SMBUS_BLOCK_PROC_CALL: + for (i = 0; i < msgbuf1[0] + 1; i++) + data->block[i] = msgbuf1[i]; + break; } return 0; } @@ -1181,43 +1544,7 @@ s32 i2c_smbus_xfer(struct i2c_adapter * adapter, u16 addr, unsigned short flags, return res; } - - -/* Next four are needed by i2c-isa */ -EXPORT_SYMBOL_GPL(i2c_adapter_dev_release); -EXPORT_SYMBOL_GPL(i2c_adapter_driver); -EXPORT_SYMBOL_GPL(i2c_adapter_class); -EXPORT_SYMBOL_GPL(i2c_bus_type); - -EXPORT_SYMBOL(i2c_add_adapter); -EXPORT_SYMBOL(i2c_del_adapter); -EXPORT_SYMBOL(i2c_del_driver); -EXPORT_SYMBOL(i2c_attach_client); -EXPORT_SYMBOL(i2c_detach_client); -EXPORT_SYMBOL(i2c_use_client); -EXPORT_SYMBOL(i2c_release_client); -EXPORT_SYMBOL(i2c_clients_command); -EXPORT_SYMBOL(i2c_check_addr); - -EXPORT_SYMBOL(i2c_master_send); -EXPORT_SYMBOL(i2c_master_recv); -EXPORT_SYMBOL(i2c_control); -EXPORT_SYMBOL(i2c_transfer); -EXPORT_SYMBOL(i2c_get_adapter); -EXPORT_SYMBOL(i2c_put_adapter); -EXPORT_SYMBOL(i2c_probe); - EXPORT_SYMBOL(i2c_smbus_xfer); -EXPORT_SYMBOL(i2c_smbus_write_quick); -EXPORT_SYMBOL(i2c_smbus_read_byte); -EXPORT_SYMBOL(i2c_smbus_write_byte); -EXPORT_SYMBOL(i2c_smbus_read_byte_data); -EXPORT_SYMBOL(i2c_smbus_write_byte_data); -EXPORT_SYMBOL(i2c_smbus_read_word_data); -EXPORT_SYMBOL(i2c_smbus_write_word_data); -EXPORT_SYMBOL(i2c_smbus_write_block_data); -EXPORT_SYMBOL(i2c_smbus_read_i2c_block_data); -EXPORT_SYMBOL(i2c_smbus_write_i2c_block_data); MODULE_AUTHOR("Simon G. Vogl "); MODULE_DESCRIPTION("I2C-Bus main module");