driver->shutdown(to_i2c_client(dev));
}
-static int i2c_device_suspend(struct device * dev, pm_message_t mesg)
+static int i2c_device_suspend(struct device *dev, pm_message_t mesg)
{
struct i2c_driver *driver;
return driver->suspend(to_i2c_client(dev), mesg);
}
-static int i2c_device_resume(struct device * dev)
+static int i2c_device_resume(struct device *dev)
{
struct i2c_driver *driver;
kfree(to_i2c_client(dev));
}
-static ssize_t show_client_name(struct device *dev, struct device_attribute *attr, char *buf)
+static ssize_t
+show_client_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);
}
-static ssize_t show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
+static ssize_t
+show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
return sprintf(buf, "%s%s\n", I2C_MODULE_PREFIX, client->name);
client->dev.platform_data = info->platform_data;
+ if (info->archdata)
+ client->dev.archdata = *info->archdata;
+
client->flags = info->flags;
client->addr = info->addr;
client->irq = info->irq;
* This returns the new i2c client, which should be saved for later use with
* i2c_unregister_device(); or NULL to indicate an error.
*/
-struct i2c_client *
-i2c_new_dummy(struct i2c_adapter *adapter, u16 address)
+struct i2c_client *i2c_new_dummy(struct i2c_adapter *adapter, u16 address)
{
struct i2c_board_info info = {
I2C_BOARD_INFO("dummy", address),
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),
+ dev_err(&adapter->dev,
+ "Can't create device at 0x%02x\n",
devinfo->board_info.addr);
}
mutex_unlock(&__i2c_board_lock);
{
int res = 0, dummy;
+ /* Can't register until after driver model init */
+ if (unlikely(WARN_ON(!i2c_bus_type.p)))
+ return -EAGAIN;
+
mutex_init(&adap->bus_lock);
mutex_init(&adap->clist_lock);
INIT_LIST_HEAD(&adap->clients);
pr_debug("I2C adapter driver [%s] forgot to specify "
"physical device\n", adap->name);
}
- sprintf(adap->dev.bus_id, "i2c-%d", adap->nr);
+
+ /* 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;
res = device_register(&adap->dev);
struct i2c_client *client, *_n;
int res;
- /* Remove the devices we created ourselves */
+ /* 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) {
if (client->adapter == adapter) {
dev_dbg(&adapter->dev, "Removing %s at 0x%x\n",
/* detach any active clients. This must be done first, because
* it can fail; in which case we give up. */
- list_for_each_entry_safe(client, _n, &adap->clients, list) {
+ list_for_each_entry_safe_reverse(client, _n, &adap->clients, list) {
struct i2c_driver *driver;
driver = client->driver;
{
int res;
+ /* Can't register until after driver model init */
+ 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->attach_adapter || driver->detach_adapter
- || driver->detach_client) {
+ if (driver->detach_adapter || driver->detach_client) {
printk(KERN_WARNING
"i2c-core: driver [%s] is confused\n",
driver->driver.name);
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);
if (client->driver && !is_newstyle_driver(client->driver)) {
client->dev.release = i2c_client_release;
- client->dev.uevent_suppress = 1;
+ dev_set_uevent_suppress(&client->dev, 1);
} 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);
+ dev_set_name(&client->dev, "%d-%04x", i2c_adapter_id(adapter),
+ client->addr);
res = device_register(&client->dev);
if (res)
goto out_err;
mutex_unlock(&adapter->clist_lock);
dev_dbg(&adapter->dev, "client [%s] registered with bus id %s\n",
- client->name, client->dev.bus_id);
+ client->name, dev_name(&client->dev));
if (adapter->client_register) {
if (adapter->client_register(client)) {
bus_unregister(&i2c_bus_type);
}
-subsys_initcall(i2c_init);
+/* We must initialize early, because some subsystems register i2c drivers
+ * in subsys_initcall() code, but are linked (and initialized) before i2c.
+ */
+postcore_initcall(i2c_init);
module_exit(i2c_exit);
/* ----------------------------------------------------
* Note that there is no requirement that each message be sent to
* the same slave address, although that is the most common model.
*/
-int i2c_transfer(struct i2c_adapter * adap, struct i2c_msg *msgs, int num)
+int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
{
- int ret;
+ unsigned long orig_jiffies;
+ int ret, try;
/* REVISIT the fault reporting model here is weak:
*
mutex_lock_nested(&adap->bus_lock, adap->level);
}
- ret = adap->algo->master_xfer(adap,msgs,num);
+ /* Retry automatically on arbitration loss */
+ orig_jiffies = jiffies;
+ for (ret = 0, try = 0; try <= adap->retries; try++) {
+ ret = adap->algo->master_xfer(adap, msgs, num);
+ if (ret != -EAGAIN)
+ break;
+ if (time_after(jiffies, orig_jiffies + adap->timeout))
+ break;
+ }
mutex_unlock(&adap->bus_lock);
return ret;
&& address_data->normal_i2c[0] == I2C_CLIENT_END)
return 0;
- dev_warn(&adapter->dev, "SMBus Quick command not supported, "
- "can't probe for chips\n");
+ dev_dbg(&adapter->dev, "SMBus Quick command not supported, "
+ "can't probe for chips\n");
return -EOPNOTSUPP;
}
}
}
+ /* 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
goto exit_free;
}
- /* Stop here if the classes do not match */
- if (!(adapter->class & driver->class))
- 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) {
struct i2c_adapter *adapter;
mutex_lock(&core_lock);
- adapter = (struct i2c_adapter *)idr_find(&i2c_adapter_idr, id);
+ adapter = idr_find(&i2c_adapter_idr, id);
if (adapter && !try_module_get(adapter->owner))
adapter = NULL;
/* The SMBus parts */
#define POLY (0x1070U << 3)
-static u8
-crc8(u16 data)
+static u8 crc8(u16 data)
{
int i;
EXPORT_SYMBOL(i2c_smbus_write_word_data);
/**
+ * i2c_smbus_process_call - SMBus "process call" protocol
+ * @client: Handle to slave device
+ * @command: Byte interpreted by slave
+ * @value: 16-bit "word" being written
+ *
+ * This executes the SMBus "process call" protocol, returning negative errno
+ * else a 16-bit unsigned "word" received from the device.
+ */
+s32 i2c_smbus_process_call(struct i2c_client *client, u8 command, u16 value)
+{
+ union i2c_smbus_data data;
+ int status;
+ data.word = value;
+
+ status = i2c_smbus_xfer(client->adapter, client->addr, client->flags,
+ I2C_SMBUS_WRITE, command,
+ I2C_SMBUS_PROC_CALL, &data);
+ return (status < 0) ? status : data.word;
+}
+EXPORT_SYMBOL(i2c_smbus_process_call);
+
+/**
* i2c_smbus_read_block_data - SMBus "block read" protocol
* @client: Handle to slave device
* @command: Byte interpreted by slave
case I2C_SMBUS_QUICK:
msg[0].len = 0;
/* Special case: The read/write field is used as data */
- msg[0].flags = flags | (read_write==I2C_SMBUS_READ)?I2C_M_RD:0;
+ msg[0].flags = flags | (read_write == I2C_SMBUS_READ ?
+ I2C_M_RD : 0);
num = 1;
break;
case I2C_SMBUS_BYTE:
* This executes an SMBus protocol operation, and returns a negative
* errno code else zero on success.
*/
-s32 i2c_smbus_xfer(struct i2c_adapter * adapter, u16 addr, unsigned short flags,
+s32 i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr, unsigned short flags,
char read_write, u8 command, int protocol,
- union i2c_smbus_data * data)
+ union i2c_smbus_data *data)
{
+ unsigned long orig_jiffies;
+ int try;
s32 res;
flags &= I2C_M_TEN | I2C_CLIENT_PEC;
if (adapter->algo->smbus_xfer) {
mutex_lock(&adapter->bus_lock);
- res = adapter->algo->smbus_xfer(adapter,addr,flags,read_write,
- command, protocol, data);
+
+ /* Retry automatically on arbitration loss */
+ orig_jiffies = jiffies;
+ for (res = 0, try = 0; try <= adapter->retries; try++) {
+ res = adapter->algo->smbus_xfer(adapter, addr, flags,
+ read_write, command,
+ protocol, data);
+ if (res != -EAGAIN)
+ break;
+ if (time_after(jiffies,
+ orig_jiffies + adapter->timeout))
+ break;
+ }
mutex_unlock(&adapter->bus_lock);
} else
res = i2c_smbus_xfer_emulated(adapter,addr,flags,read_write,
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff