From: Luca Ceresoli <luca@xxxxxxxxxxxxxxxx>
i2c-mux instantiates one i2c_algorithm for each downstream adapter.
However these algorithms are all identical, depending only on the
parent adapter.
Avoid duplication by hoisting the i2c_algorithm from the adapters to
the i2c_mux_core object, and reuse it in all the adapters.
Signed-off-by: Luca Ceresoli <luca@xxxxxxxxxxxxxxxx>
---
Changes v1 -> v2:
- include i2c.h (fixes build failure on i2c-mux-ltc4306)
---
drivers/i2c/i2c-mux.c | 37 ++++++++++++++++++-------------------
include/linux/i2c-mux.h | 2 ++
2 files changed, 20 insertions(+), 19 deletions(-)
diff --git a/drivers/i2c/i2c-mux.c b/drivers/i2c/i2c-mux.c
index f330690b4125..2b0cc2ad0a17 100644
--- a/drivers/i2c/i2c-mux.c
+++ b/drivers/i2c/i2c-mux.c
@@ -30,7 +30,6 @@
/* multiplexer per channel data */
struct i2c_mux_priv {
struct i2c_adapter adap;
- struct i2c_algorithm algo;
struct i2c_mux_core *muxc;
u32 chan_id;
};
@@ -263,6 +262,23 @@ struct i2c_mux_core *i2c_mux_alloc(struct i2c_adapter *parent,
muxc->deselect = deselect;
muxc->max_adapters = max_adapters;
+ /* Need to do algo dynamically because we don't know ahead
+ * of time what sort of physical adapter we'll be dealing with.
+ */
+ if (parent->algo->master_xfer) {
+ if (muxc->mux_locked)
+ muxc->algo.master_xfer = i2c_mux_master_xfer;
+ else
+ muxc->algo.master_xfer = __i2c_mux_master_xfer;
+ }
+ if (parent->algo->smbus_xfer) {
+ if (muxc->mux_locked)
+ muxc->algo.smbus_xfer = i2c_mux_smbus_xfer;
+ else
+ muxc->algo.smbus_xfer = __i2c_mux_smbus_xfer;
+ }
+ muxc->algo.functionality = i2c_mux_functionality;
+
return muxc;
}
EXPORT_SYMBOL_GPL(i2c_mux_alloc);
@@ -301,28 +317,11 @@ int i2c_mux_add_adapter(struct i2c_mux_core *muxc,
priv->muxc = muxc;
priv->chan_id = chan_id;
- /* Need to do algo dynamically because we don't know ahead
- * of time what sort of physical adapter we'll be dealing with.
- */
- if (parent->algo->master_xfer) {
- if (muxc->mux_locked)
- priv->algo.master_xfer = i2c_mux_master_xfer;
- else
- priv->algo.master_xfer = __i2c_mux_master_xfer;
- }
- if (parent->algo->smbus_xfer) {
- if (muxc->mux_locked)
- priv->algo.smbus_xfer = i2c_mux_smbus_xfer;
- else
- priv->algo.smbus_xfer = __i2c_mux_smbus_xfer;
- }
- priv->algo.functionality = i2c_mux_functionality;
-
/* Now fill out new adapter structure */
snprintf(priv->adap.name, sizeof(priv->adap.name),
"i2c-%d-mux (chan_id %d)", i2c_adapter_id(parent), chan_id);
priv->adap.owner = THIS_MODULE;
- priv->adap.algo = &priv->algo;
+ priv->adap.algo = &muxc->algo;
priv->adap.algo_data = priv;
priv->adap.dev.parent = &parent->dev;
priv->adap.retries = parent->retries;
diff --git a/include/linux/i2c-mux.h b/include/linux/i2c-mux.h
index bd74d5706f3b..5a4ffca99f5d 100644
--- a/include/linux/i2c-mux.h
+++ b/include/linux/i2c-mux.h
@@ -28,6 +28,7 @@
#ifdef __KERNEL__
#include <linux/bitops.h>
+#include <linux/i2c.h>
struct i2c_mux_core {
struct i2c_adapter *parent;
@@ -36,6 +37,7 @@ struct i2c_mux_core {
unsigned int arbitrator:1;
unsigned int gate:1;
+ struct i2c_algorithm algo;
void *priv;
int (*select)(struct i2c_mux_core *, u32 chan_id);
--
2.17.1
