#include <linux/completion.h>
#include <linux/hardirq.h>
#include <linux/irqflags.h>
+#include <linux/rwsem.h>
+#include <linux/pm_runtime.h>
#include <asm/uaccess.h>
#include "i2c-core.h"
+/* core_lock protects i2c_adapter_idr, 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);
-#define is_newstyle_driver(d) ((d)->probe || (d)->remove || (d)->detect)
-
-static int i2c_attach_client(struct i2c_client *client);
+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);
/* ------------------------------------------------------------------------- */
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;
- /* make legacy i2c drivers bypass driver model probing entirely;
- * such drivers scan each i2c adapter/bus themselves.
- */
- if (!is_newstyle_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;
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;
dev_dbg(dev, "probe\n");
status = driver->probe(client, i2c_match_id(driver->id_table, client));
- if (status)
+ if (status) {
client->driver = NULL;
+ i2c_set_clientdata(client, NULL);
+ }
return status;
}
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);
dev->driver = NULL;
status = 0;
}
- if (status == 0)
+ if (status == 0) {
client->driver = NULL;
+ i2c_set_clientdata(client, NULL);
+ }
return status;
}
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)
+#ifdef CONFIG_PM_SLEEP
+static int i2c_legacy_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)
+static int i2c_legacy_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_release(struct device *dev)
+static int i2c_device_pm_suspend(struct device *dev)
{
- struct i2c_client *client = to_i2c_client(dev);
- complete(&client->released);
+ const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
+
+ if (pm_runtime_suspended(dev))
+ return 0;
+
+ if (pm)
+ return pm->suspend ? pm->suspend(dev) : 0;
+
+ return i2c_legacy_suspend(dev, PMSG_SUSPEND);
+}
+
+static int i2c_device_pm_resume(struct device *dev)
+{
+ const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
+ int ret;
+
+ if (pm)
+ ret = pm->resume ? pm->resume(dev) : 0;
+ else
+ ret = i2c_legacy_resume(dev);
+
+ if (!ret) {
+ pm_runtime_disable(dev);
+ pm_runtime_set_active(dev);
+ pm_runtime_enable(dev);
+ }
+
+ return ret;
+}
+
+static int i2c_device_pm_freeze(struct device *dev)
+{
+ const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
+
+ if (pm_runtime_suspended(dev))
+ return 0;
+
+ if (pm)
+ return pm->freeze ? pm->freeze(dev) : 0;
+
+ return i2c_legacy_suspend(dev, PMSG_FREEZE);
}
+static int i2c_device_pm_thaw(struct device *dev)
+{
+ const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
+
+ if (pm_runtime_suspended(dev))
+ return 0;
+
+ if (pm)
+ return pm->thaw ? pm->thaw(dev) : 0;
+
+ return i2c_legacy_resume(dev);
+}
+
+static int i2c_device_pm_poweroff(struct device *dev)
+{
+ const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
+
+ if (pm_runtime_suspended(dev))
+ return 0;
+
+ if (pm)
+ return pm->poweroff ? pm->poweroff(dev) : 0;
+
+ return i2c_legacy_suspend(dev, PMSG_HIBERNATE);
+}
+
+static int i2c_device_pm_restore(struct device *dev)
+{
+ const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
+ int ret;
+
+ if (pm)
+ ret = pm->restore ? pm->restore(dev) : 0;
+ else
+ ret = i2c_legacy_resume(dev);
+
+ if (!ret) {
+ pm_runtime_disable(dev);
+ pm_runtime_set_active(dev);
+ pm_runtime_enable(dev);
+ }
+
+ return ret;
+}
+#else /* !CONFIG_PM_SLEEP */
+#define i2c_device_pm_suspend NULL
+#define i2c_device_pm_resume NULL
+#define i2c_device_pm_freeze NULL
+#define i2c_device_pm_thaw NULL
+#define i2c_device_pm_poweroff NULL
+#define i2c_device_pm_restore NULL
+#endif /* !CONFIG_PM_SLEEP */
+
static void i2c_client_dev_release(struct device *dev)
{
kfree(to_i2c_client(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
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
+};
+
+static const struct dev_pm_ops i2c_device_pm_ops = {
+ .suspend = i2c_device_pm_suspend,
+ .resume = i2c_device_pm_resume,
+ .freeze = i2c_device_pm_freeze,
+ .thaw = i2c_device_pm_thaw,
+ .poweroff = i2c_device_pm_poweroff,
+ .restore = i2c_device_pm_restore,
+ SET_RUNTIME_PM_OPS(
+ pm_generic_runtime_suspend,
+ pm_generic_runtime_resume,
+ pm_generic_runtime_idle
+ )
};
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,
+ .pm = &i2c_device_pm_ops,
};
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
*/
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;
}
EXPORT_SYMBOL(i2c_verify_client);
+/* This is a permissive address validity check, I2C address map constraints
+ * are purposedly not enforced, except for the general call address. */
+static int i2c_check_client_addr_validity(const struct i2c_client *client)
+{
+ if (client->flags & I2C_CLIENT_TEN) {
+ /* 10-bit address, all values are valid */
+ if (client->addr > 0x3ff)
+ return -EINVAL;
+ } else {
+ /* 7-bit address, reject the general call address */
+ if (client->addr == 0x00 || client->addr > 0x7f)
+ return -EINVAL;
+ }
+ return 0;
+}
+
+/* And this is a strict address validity check, used when probing. If a
+ * device uses a reserved address, then it shouldn't be probed. 7-bit
+ * addressing is assumed, 10-bit address devices are rare and should be
+ * explicitly enumerated. */
+static int i2c_check_addr_validity(unsigned short addr)
+{
+ /*
+ * Reserved addresses per I2C specification:
+ * 0x00 General call address / START byte
+ * 0x01 CBUS address
+ * 0x02 Reserved for different bus format
+ * 0x03 Reserved for future purposes
+ * 0x04-0x07 Hs-mode master code
+ * 0x78-0x7b 10-bit slave addressing
+ * 0x7c-0x7f Reserved for future purposes
+ */
+ if (addr < 0x08 || addr > 0x77)
+ return -EINVAL;
+ return 0;
+}
+
/**
- * 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.
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 validity */
+ status = i2c_check_client_addr_validity(client);
+ if (status) {
+ dev_err(&adap->dev, "Invalid %d-bit I2C address 0x%02hx\n",
+ client->flags & I2C_CLIENT_TEN ? 10 : 7, client->addr);
+ goto out_err_silent;
}
+
+ /* 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.type = &i2c_client_type;
+#ifdef CONFIG_OF
+ client->dev.of_node = info->of_node;
+#endif
+
+ 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);
+out_err_silent:
+ kfree(client);
+ return NULL;
}
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;
- }
-
- mutex_lock(&adapter->clist_lock);
- list_del(&client->list);
- mutex_unlock(&adapter->clist_lock);
-
device_unregister(&client->dev);
}
EXPORT_SYMBOL_GPL(i2c_unregister_device);
complete(&adap->dev_released);
}
+/*
+ * 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;
+ }
+
+ client = i2c_new_device(adap, &info);
+ if (!client)
+ return -EINVAL;
+
+ /* Keep track of the added device */
+ i2c_lock_adapter(adap);
+ list_add_tail(&client->detected, &adap->userspace_clients);
+ i2c_unlock_adapter(adap);
+ 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
-show_adapter_name(struct device *dev, struct device_attribute *attr, char *buf)
+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);
- return sprintf(buf, "%s\n", adap->name);
+ 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;
+ i2c_lock_adapter(adap);
+ list_for_each_entry_safe(client, next, &adap->userspace_clients,
+ detected) {
+ if (client->addr == addr) {
+ 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;
+ }
+ }
+ i2c_unlock_adapter(adap);
+
+ 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),
- { },
+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 const struct attribute_group *i2c_adapter_attr_groups[] = {
+ &i2c_adapter_attr_group,
+ NULL
};
-static struct class i2c_adapter_class = {
- .owner = THIS_MODULE,
- .name = "i2c-adapter",
- .dev_attrs = i2c_adapter_attrs,
+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;
- 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,
"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)
+static int i2c_do_add_adapter(struct i2c_driver *driver,
+ struct i2c_adapter *adap)
{
- struct i2c_driver *driver = to_i2c_driver(d);
- struct i2c_adapter *adap = data;
-
/* Detect supported devices on that bus, and instantiate them */
i2c_detect(adap, driver);
return 0;
}
+static int __process_new_adapter(struct device_driver *d, void *data)
+{
+ return i2c_do_add_adapter(to_i2c_driver(d), data);
+}
+
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);
+ rt_mutex_init(&adap->bus_lock);
+ INIT_LIST_HEAD(&adap->userspace_clients);
/* Set default timeout to 1 second if not already set */
if (adap->timeout == 0)
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);
/* Notify drivers */
+ mutex_lock(&core_lock);
dummy = bus_for_each_drv(&i2c_bus_type, NULL, adap,
- i2c_do_add_adapter);
-
-out_unlock:
+ __process_new_adapter);
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;
}
/**
}
EXPORT_SYMBOL_GPL(i2c_add_numbered_adapter);
-static int i2c_do_del_adapter(struct device_driver *d, void *data)
+static int i2c_do_del_adapter(struct i2c_driver *driver,
+ struct i2c_adapter *adapter)
{
- struct i2c_driver *driver = to_i2c_driver(d);
- struct i2c_adapter *adapter = data;
struct i2c_client *client, *_n;
int res;
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;
+}
+
+static int __process_removed_adapter(struct device_driver *d, void *data)
+{
+ return i2c_do_del_adapter(to_i2c_driver(d), data);
+}
+
/**
* i2c_del_adapter - unregister I2C adapter
* @adap: the adapter being unregistered
*/
int i2c_del_adapter(struct i2c_adapter *adap)
{
- struct i2c_client *client, *_n;
int res = 0;
-
- mutex_lock(&core_lock);
+ struct i2c_adapter *found;
+ struct i2c_client *client, *next;
/* 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);
+ __process_removed_adapter);
+ mutex_unlock(&core_lock);
if (res)
- goto out_unlock;
+ return res;
- /* Detach any active clients */
- list_for_each_entry_safe_reverse(client, _n, &adap->clients, list) {
+ /* Remove devices instantiated from sysfs */
+ i2c_lock_adapter(adap);
+ list_for_each_entry_safe(client, next, &adap->userspace_clients,
+ detected) {
+ dev_dbg(&adap->dev, "Removing %s at 0x%x\n", client->name,
+ client->addr);
+ list_del(&client->detected);
i2c_unregister_device(client);
}
+ i2c_unlock_adapter(adap);
+
+ /* 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
+
+ /* device name is gone after device_unregister */
+ dev_dbg(&adap->dev, "adapter [%s] unregistered\n", adap->name);
/* clean up the sysfs representation */
init_completion(&adap->dev_released);
wait_for_completion(&adap->dev_released);
/* free bus id */
+ mutex_lock(&core_lock);
idr_remove(&i2c_adapter_idr, adap->nr);
-
- dev_dbg(&adap->dev, "adapter [%s] unregistered\n", adap->name);
+ mutex_unlock(&core_lock);
/* Clear the device structure in case this adapter is ever going to be
added again */
memset(&adap->dev, 0, sizeof(adap->dev));
- out_unlock:
- mutex_unlock(&core_lock);
- return res;
+ return 0;
}
EXPORT_SYMBOL(i2c_del_adapter);
/* ------------------------------------------------------------------------- */
-static int __attach_adapter(struct device *dev, void *data)
+static int __process_new_driver(struct device *dev, void *data)
{
- struct i2c_adapter *adapter = to_i2c_adapter(dev);
- struct i2c_driver *driver = data;
-
- i2c_detect(adapter, driver);
-
- /* Legacy drivers scan i2c busses directly */
- if (driver->attach_adapter)
- driver->attach_adapter(adapter);
-
- return 0;
+ if (dev->type != &i2c_adapter_type)
+ return 0;
+ return i2c_do_add_adapter(data, to_i2c_adapter(dev));
}
/*
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 */
- class_for_each_device(&i2c_adapter_class, NULL, driver,
- __attach_adapter);
-
+ mutex_lock(&core_lock);
+ bus_for_each_dev(&i2c_bus_type, NULL, driver, __process_new_driver);
mutex_unlock(&core_lock);
+
return 0;
}
EXPORT_SYMBOL(i2c_register_driver);
-static int __detach_adapter(struct device *dev, void *data)
+static int __process_removed_driver(struct device *dev, void *data)
{
- struct i2c_adapter *adapter = to_i2c_adapter(dev);
- struct i2c_driver *driver = data;
- struct i2c_client *client, *_n;
-
- /* 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) {
- dev_dbg(&adapter->dev, "Removing %s at 0x%x\n",
- client->name, client->addr);
- list_del(&client->detected);
- i2c_unregister_device(client);
- }
-
- if (is_newstyle_driver(driver))
+ if (dev->type != &i2c_adapter_type)
return 0;
-
- if (driver->detach_adapter) {
- if (driver->detach_adapter(adapter))
- dev_err(&adapter->dev,
- "detach_adapter failed for driver [%s]\n",
- driver->driver.name);
- }
-
- return 0;
+ return i2c_do_del_adapter(data, to_i2c_adapter(dev));
}
/**
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, __process_removed_driver);
+ 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);
return device_for_each_child(&adapter->dev, &addr, __i2c_check_addr);
}
-static 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));
-
- 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;
-}
-
/**
* i2c_use_client - increments the reference count of the i2c client structure
* @client: the client being referenced
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;
}
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);
}
#endif
if (in_atomic() || irqs_disabled()) {
- ret = mutex_trylock(&adap->bus_lock);
+ ret = rt_mutex_trylock(&adap->bus_lock);
if (!ret)
/* I2C activity is ongoing. */
return -EAGAIN;
} else {
- mutex_lock_nested(&adap->bus_lock, adap->level);
+ rt_mutex_lock(&adap->bus_lock);
}
/* Retry automatically on arbitration loss */
if (time_after(jiffies, orig_jiffies + adap->timeout))
break;
}
- mutex_unlock(&adap->bus_lock);
+ rt_mutex_unlock(&adap->bus_lock);
return ret;
} else {
* i2c_master_send - issue a single I2C message in master transmit mode
* @client: Handle to slave device
* @buf: Data that will be written to the slave
- * @count: How many bytes to write
+ * @count: How many bytes to write, must be less than 64k since msg.len is u16
*
* Returns negative errno, or else the number of bytes written.
*/
-int i2c_master_send(struct i2c_client *client,const char *buf ,int count)
+int i2c_master_send(struct i2c_client *client, const char *buf, int count)
{
int ret;
- struct i2c_adapter *adap=client->adapter;
+ struct i2c_adapter *adap = client->adapter;
struct i2c_msg msg;
msg.addr = client->addr;
* i2c_master_recv - issue a single I2C message in master receive mode
* @client: Handle to slave device
* @buf: Where to store data read from slave
- * @count: How many bytes to read
+ * @count: How many bytes to read, must be less than 64k since msg.len is u16
*
* Returns negative errno, or else the number of bytes read.
*/
-int i2c_master_recv(struct i2c_client *client, char *buf ,int count)
+int i2c_master_recv(struct i2c_client *client, char *buf, int count)
{
- struct i2c_adapter *adap=client->adapter;
+ struct i2c_adapter *adap = client->adapter;
struct i2c_msg msg;
int ret;
* 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))
+/*
+ * Legacy default probe function, mostly relevant for SMBus. 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 short byte read instead. Also, some bus drivers don't implement
+ * quick write, so we fallback to a byte read in that case too.
+ * On x86, there is another special case for FSC hardware monitoring chips,
+ * which want regular byte reads (address 0x73.) Fortunately, these are the
+ * only known chips using this I2C address on PC hardware.
+ * Returns 1 if probe succeeded, 0 if not.
+ */
+static int i2c_default_probe(struct i2c_adapter *adap, unsigned short addr)
{
- 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;
- }
+ int err;
+ union i2c_smbus_data dummy;
+
+#ifdef CONFIG_X86
+ if (addr == 0x73 && (adap->class & I2C_CLASS_HWMON)
+ && i2c_check_functionality(adap, I2C_FUNC_SMBUS_READ_BYTE_DATA))
+ err = i2c_smbus_xfer(adap, addr, 0, I2C_SMBUS_READ, 0,
+ I2C_SMBUS_BYTE_DATA, &dummy);
+ else
+#endif
+ if ((addr & ~0x07) == 0x30 || (addr & ~0x0f) == 0x50
+ || !i2c_check_functionality(adap, I2C_FUNC_SMBUS_QUICK))
+ err = i2c_smbus_xfer(adap, addr, 0, I2C_SMBUS_READ, 0,
+ I2C_SMBUS_BYTE, &dummy);
+ else
+ err = i2c_smbus_xfer(adap, addr, 0, I2C_SMBUS_WRITE, 0,
+ I2C_SMBUS_QUICK, NULL);
- return 0;
+ return err >= 0;
}
-EXPORT_SYMBOL(i2c_probe);
-/* Separate detection function for new-style drivers */
-static int i2c_detect_address(struct i2c_client *temp_client, int kind,
+static int i2c_detect_address(struct i2c_client *temp_client,
struct i2c_driver *driver)
{
struct i2c_board_info info;
int err;
/* Make sure the address is valid */
- if (addr < 0x03 || addr > 0x77) {
+ err = i2c_check_addr_validity(addr);
+ if (err) {
dev_warn(&adapter->dev, "Invalid probe address 0x%02x\n",
addr);
- return -EINVAL;
+ return err;
}
/* 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);
- }
+ /* Make sure there is something at this address */
+ if (!i2c_default_probe(adapter, addr))
+ return 0;
/* Finally call the custom detection function */
memset(&info, 0, sizeof(struct i2c_board_info));
info.addr = addr;
- err = driver->detect(temp_client, kind, &info);
+ err = driver->detect(temp_client, &info);
if (err) {
/* -ENODEV is returned if the detection fails. We catch it
here as this isn't an error. */
static int i2c_detect(struct i2c_adapter *adapter, struct i2c_driver *driver)
{
- const struct i2c_client_address_data *address_data;
+ const unsigned short *address_list;
struct i2c_client *temp_client;
int i, err = 0;
int adap_id = i2c_adapter_id(adapter);
- address_data = driver->address_data;
- if (!driver->detect || !address_data)
+ address_list = driver->address_list;
+ if (!driver->detect || !address_list)
return 0;
/* Set up a temporary client to help detect callback */
return -ENOMEM;
temp_client->adapter = 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);
- temp_client->addr = forces[kind][i + 1];
- err = i2c_detect_address(temp_client,
- kind, driver);
- if (err)
- goto exit_free;
- }
- }
- }
- }
-
/* Stop here if the classes do not match */
if (!(adapter->class & driver->class))
goto exit_free;
/* 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)
+ if (address_list[0] == I2C_CLIENT_END)
goto exit_free;
dev_warn(&adapter->dev, "SMBus Quick command not supported, "
goto exit_free;
}
- /* 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]);
- temp_client->addr = address_data->probe[i + 1];
- err = i2c_detect_address(temp_client, -1, driver);
- if (err)
- goto exit_free;
- }
- }
-
- /* 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;
-
+ for (i = 0; address_list[i] != I2C_CLIENT_END; i += 1) {
dev_dbg(&adapter->dev, "found normal entry for adapter %d, "
- "addr 0x%02x\n", adap_id,
- address_data->normal_i2c[i]);
- temp_client->addr = address_data->normal_i2c[i];
- err = i2c_detect_address(temp_client, -1, driver);
+ "addr 0x%02x\n", adap_id, address_list[i]);
+ temp_client->addr = address_list[i];
+ err = i2c_detect_address(temp_client, driver);
if (err)
goto exit_free;
}
for (i = 0; addr_list[i] != I2C_CLIENT_END; i++) {
/* Check address validity */
- if (addr_list[i] < 0x03 || addr_list[i] > 0x77) {
+ if (i2c_check_addr_validity(addr_list[i]) < 0) {
dev_warn(&adap->dev, "Invalid 7-bit address "
"0x%02x\n", addr_list[i]);
continue;
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)) {
- union i2c_smbus_data data;
-
- if (i2c_smbus_xfer(adap, addr_list[i], 0,
- I2C_SMBUS_READ, 0,
- I2C_SMBUS_BYTE, &data) >= 0)
- break;
- } else {
- if (i2c_smbus_xfer(adap, addr_list[i], 0,
- I2C_SMBUS_WRITE, 0,
- I2C_SMBUS_QUICK, NULL) >= 0)
- break;
- }
+ /* Test address responsiveness */
+ if (i2c_default_probe(adap, addr_list[i]))
+ break;
}
if (addr_list[i] == I2C_CLIENT_END) {
}
EXPORT_SYMBOL_GPL(i2c_new_probed_device);
-struct i2c_adapter* i2c_get_adapter(int id)
+struct i2c_adapter *i2c_get_adapter(int id)
{
struct i2c_adapter *adapter;
{
int i;
- for(i = 0; i < 8; i++) {
+ for (i = 0; i < 8; i++) {
if (data & 0x8000)
data = data ^ POLY;
data = data << 1;
{
int i;
- for(i = 0; i < count; i++)
+ for (i = 0; i < count; i++)
crc = crc8((crc ^ p[i]) << 8);
return crc;
}
*/
s32 i2c_smbus_write_byte(struct i2c_client *client, u8 value)
{
- return i2c_smbus_xfer(client->adapter,client->addr,client->flags,
+ return i2c_smbus_xfer(client->adapter, client->addr, client->flags,
I2C_SMBUS_WRITE, value, I2C_SMBUS_BYTE, NULL);
}
EXPORT_SYMBOL(i2c_smbus_write_byte);
{
union i2c_smbus_data data;
data.byte = value;
- return i2c_smbus_xfer(client->adapter,client->addr,client->flags,
- I2C_SMBUS_WRITE,command,
- I2C_SMBUS_BYTE_DATA,&data);
+ return i2c_smbus_xfer(client->adapter, client->addr, client->flags,
+ I2C_SMBUS_WRITE, command,
+ I2C_SMBUS_BYTE_DATA, &data);
}
EXPORT_SYMBOL(i2c_smbus_write_byte_data);
{
union i2c_smbus_data data;
data.word = value;
- return i2c_smbus_xfer(client->adapter,client->addr,client->flags,
- I2C_SMBUS_WRITE,command,
- I2C_SMBUS_WORD_DATA,&data);
+ return i2c_smbus_xfer(client->adapter, client->addr, client->flags,
+ I2C_SMBUS_WRITE, command,
+ I2C_SMBUS_WORD_DATA, &data);
}
EXPORT_SYMBOL(i2c_smbus_write_word_data);
length = I2C_SMBUS_BLOCK_MAX;
data.block[0] = length;
memcpy(&data.block[1], values, length);
- return i2c_smbus_xfer(client->adapter,client->addr,client->flags,
- I2C_SMBUS_WRITE,command,
- I2C_SMBUS_BLOCK_DATA,&data);
+ return i2c_smbus_xfer(client->adapter, client->addr, client->flags,
+ I2C_SMBUS_WRITE, command,
+ I2C_SMBUS_BLOCK_DATA, &data);
}
EXPORT_SYMBOL(i2c_smbus_write_block_data);
/* Simulate a SMBus command using the i2c protocol
No checking of parameters is done! */
-static s32 i2c_smbus_xfer_emulated(struct i2c_adapter * adapter, u16 addr,
- unsigned short flags,
- char read_write, u8 command, int size,
- union i2c_smbus_data * data)
+static s32 i2c_smbus_xfer_emulated(struct i2c_adapter *adapter, u16 addr,
+ unsigned short flags,
+ char read_write, u8 command, int size,
+ union i2c_smbus_data *data)
{
/* So we need to generate a series of msgs. In the case of writing, we
need to use only one message; when reading, we need two. We initialize
simpler. */
unsigned char msgbuf0[I2C_SMBUS_BLOCK_MAX+3];
unsigned char msgbuf1[I2C_SMBUS_BLOCK_MAX+2];
- int num = read_write == I2C_SMBUS_READ?2:1;
+ int num = read_write == I2C_SMBUS_READ ? 2 : 1;
struct i2c_msg msg[2] = { { addr, flags, 1, msgbuf0 },
{ addr, flags | I2C_M_RD, 0, msgbuf1 }
};
int status;
msgbuf0[0] = command;
- switch(size) {
+ switch (size) {
case I2C_SMBUS_QUICK:
msg[0].len = 0;
/* Special case: The read/write field is used as data */
if (read_write == I2C_SMBUS_READ)
msg[1].len = 2;
else {
- msg[0].len=3;
+ msg[0].len = 3;
msgbuf0[1] = data->word & 0xff;
msgbuf0[2] = data->word >> 8;
}
}
if (read_write == I2C_SMBUS_READ)
- switch(size) {
- case I2C_SMBUS_BYTE:
- data->byte = msgbuf0[0];
- break;
- case I2C_SMBUS_BYTE_DATA:
- data->byte = msgbuf1[0];
- break;
- case I2C_SMBUS_WORD_DATA:
- case I2C_SMBUS_PROC_CALL:
- data->word = msgbuf1[0] | (msgbuf1[1] << 8);
- break;
- case I2C_SMBUS_I2C_BLOCK_DATA:
- for (i = 0; i < data->block[0]; 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;
+ switch (size) {
+ case I2C_SMBUS_BYTE:
+ data->byte = msgbuf0[0];
+ break;
+ case I2C_SMBUS_BYTE_DATA:
+ data->byte = msgbuf1[0];
+ break;
+ case I2C_SMBUS_WORD_DATA:
+ case I2C_SMBUS_PROC_CALL:
+ data->word = msgbuf1[0] | (msgbuf1[1] << 8);
+ break;
+ case I2C_SMBUS_I2C_BLOCK_DATA:
+ for (i = 0; i < data->block[0]; 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;
}
flags &= I2C_M_TEN | I2C_CLIENT_PEC;
if (adapter->algo->smbus_xfer) {
- mutex_lock(&adapter->bus_lock);
+ rt_mutex_lock(&adapter->bus_lock);
/* Retry automatically on arbitration loss */
orig_jiffies = jiffies;
orig_jiffies + adapter->timeout))
break;
}
- mutex_unlock(&adapter->bus_lock);
+ rt_mutex_unlock(&adapter->bus_lock);
} else
- res = i2c_smbus_xfer_emulated(adapter,addr,flags,read_write,
+ res = i2c_smbus_xfer_emulated(adapter, addr, flags, read_write,
command, protocol, data);
return res;
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff