case is when the length of an SMBus block data response
(from the SMBus slave) is outside the range 1-32 bytes.
+ESHUTDOWN
+ Returned when a transfer was requested using an adapter
+ which is already suspended.
+
ETIMEDOUT
This is returned by drivers when an operation took too much
time, and was aborted before it completed.
if (!adap->lock_ops)
adap->lock_ops = &i2c_adapter_lock_ops;
+ adap->locked_flags = 0;
rt_mutex_init(&adap->bus_lock);
rt_mutex_init(&adap->mux_lock);
mutex_init(&adap->userspace_clients_lock);
if (WARN_ON(!msgs || num < 1))
return -EINVAL;
+ if (WARN_ON(test_bit(I2C_ALF_IS_SUSPENDED, &adap->locked_flags)))
+ return -ESHUTDOWN;
if (adap->quirks && i2c_check_for_quirks(adap, msgs, num))
return -EOPNOTSUPP;
int timeout; /* in jiffies */
int retries;
struct device dev; /* the adapter device */
+ unsigned long locked_flags; /* owned by the I2C core */
+#define I2C_ALF_IS_SUSPENDED 0
int nr;
char name[48];
adapter->lock_ops->unlock_bus(adapter, flags);
}
+/**
+ * i2c_mark_adapter_suspended - Report suspended state of the adapter to the core
+ * @adap: Adapter to mark as suspended
+ *
+ * When using this helper to mark an adapter as suspended, the core will reject
+ * further transfers to this adapter. The usage of this helper is optional but
+ * recommended for devices having distinct handlers for system suspend and
+ * runtime suspend. More complex devices are free to implement custom solutions
+ * to reject transfers when suspended.
+ */
+static inline void i2c_mark_adapter_suspended(struct i2c_adapter *adap)
+{
+ i2c_lock_bus(adap, I2C_LOCK_ROOT_ADAPTER);
+ set_bit(I2C_ALF_IS_SUSPENDED, &adap->locked_flags);
+ i2c_unlock_bus(adap, I2C_LOCK_ROOT_ADAPTER);
+}
+
+/**
+ * i2c_mark_adapter_resumed - Report resumed state of the adapter to the core
+ * @adap: Adapter to mark as resumed
+ *
+ * When using this helper to mark an adapter as resumed, the core will allow
+ * further transfers to this adapter. See also further notes to
+ * @i2c_mark_adapter_suspended().
+ */
+static inline void i2c_mark_adapter_resumed(struct i2c_adapter *adap)
+{
+ i2c_lock_bus(adap, I2C_LOCK_ROOT_ADAPTER);
+ clear_bit(I2C_ALF_IS_SUSPENDED, &adap->locked_flags);
+ i2c_unlock_bus(adap, I2C_LOCK_ROOT_ADAPTER);
+}
+
/*flags for the client struct: */
#define I2C_CLIENT_PEC 0x04 /* Use Packet Error Checking */
#define I2C_CLIENT_TEN 0x10 /* we have a ten bit chip address */