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This is useful when the mux can only use an I2C address that is used by a child device because no other addresses are free to use. eg. the mux can only use address 0x18 which is used by amc6821 connected to the mux. Signed-off-by: Farouk Bouabid --- drivers/i2c/i2c-core-base.c | 6 +++++- drivers/i2c/i2c-mux.c | 48 ++++++++++++++++++++++++++++++++++++++++++++- include/linux/i2c-mux.h | 1 + include/linux/i2c.h | 7 +++++++ 4 files changed, 60 insertions(+), 2 deletions(-) diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c index ff5c486a1dbb..ce2425b0486d 100644 --- a/drivers/i2c/i2c-core-base.c +++ b/drivers/i2c/i2c-core-base.c @@ -821,9 +821,13 @@ static int i2c_check_mux_children(struct device *dev, void *addrp) static int i2c_check_addr_busy(struct i2c_adapter *adapter, int addr) { struct i2c_adapter *parent = i2c_parent_is_i2c_adapter(adapter); + bool skip_check = false; int result = 0; - if (parent) + if (adapter->quirks && adapter->quirks->flags & I2C_AQ_SKIP_ADDR_CHECK) + skip_check = adapter->quirks->skip_addr_in_parent == addr; + + if (parent && !skip_check) result = i2c_check_mux_parents(parent, addr); if (!result) diff --git a/drivers/i2c/i2c-mux.c b/drivers/i2c/i2c-mux.c index 57ff09f18c37..644509bc3496 100644 --- a/drivers/i2c/i2c-mux.c +++ b/drivers/i2c/i2c-mux.c @@ -334,7 +334,53 @@ int i2c_mux_add_adapter(struct i2c_mux_core *muxc, priv->adap.dev.parent = &parent->dev; priv->adap.retries = parent->retries; priv->adap.timeout = parent->timeout; - priv->adap.quirks = parent->quirks; + + struct i2c_adapter_quirks *quirks; + /* + * When creating the adapter, the node devices are checked for I2C address + * match with other devices on the parent adapter, among which is the mux itself. + * If a match is found the node device is not probed successfully. + * Allow the mux to have the same address as a child device by skipping this check. + */ + if (muxc->share_addr_with_children) { + struct i2c_client *client = to_i2c_client(muxc->dev); + + if (muxc->dev->type != &i2c_client_type) + dev_warn_once(muxc->dev, "Mux is not an I2C device\n"); + + quirks = devm_kzalloc(muxc->dev, sizeof(*quirks), GFP_KERNEL); + if (!quirks) + return -ENOMEM; + + if (parent->quirks) + memcpy(quirks, parent->quirks, sizeof(*quirks)); + + quirks->flags |= I2C_AQ_SKIP_ADDR_CHECK; + quirks->skip_addr_in_parent = client->addr; + priv->adap.quirks = quirks; + + } else if (parent->quirks && + parent->quirks->flags & I2C_AQ_SKIP_ADDR_CHECK) { + /* + * Another I2C mux device can be a child of the Mule I2C mux. + * The former could probably not allow address conflict between + * its address and its own children addresses. + * + * For this purpose, do not propagate this flag unless + * share_addr_with_children is set. + */ + quirks = devm_kzalloc(muxc->dev, sizeof(*quirks), GFP_KERNEL); + if (!quirks) + return -ENOMEM; + + memcpy(quirks, parent->quirks, sizeof(*quirks)); + quirks->flags &= ~I2C_AQ_SKIP_ADDR_CHECK; + priv->adap.quirks = quirks; + + } else { + priv->adap.quirks = parent->quirks; + } + if (muxc->mux_locked) priv->adap.lock_ops = &i2c_mux_lock_ops; else diff --git a/include/linux/i2c-mux.h b/include/linux/i2c-mux.h index 98ef73b7c8fd..17ac68bf1703 100644 --- a/include/linux/i2c-mux.h +++ b/include/linux/i2c-mux.h @@ -21,6 +21,7 @@ struct i2c_mux_core { unsigned int mux_locked:1; unsigned int arbitrator:1; unsigned int gate:1; + unsigned int share_addr_with_children:1; void *priv; diff --git a/include/linux/i2c.h b/include/linux/i2c.h index 5e6cd43a6dbd..c3acbaaadae9 100644 --- a/include/linux/i2c.h +++ b/include/linux/i2c.h @@ -670,6 +670,7 @@ int i2c_generic_scl_recovery(struct i2c_adapter *adap); * @max_read_len: maximum length of a read message * @max_comb_1st_msg_len: maximum length of the first msg in a combined message * @max_comb_2nd_msg_len: maximum length of the second msg in a combined message + * @skip_addr_in_parent: No conflict check on parent adapter for a given address * * Note about combined messages: Some I2C controllers can only send one message * per transfer, plus something called combined message or write-then-read. @@ -690,6 +691,7 @@ struct i2c_adapter_quirks { u16 max_read_len; u16 max_comb_1st_msg_len; u16 max_comb_2nd_msg_len; + unsigned short skip_addr_in_parent; }; /* enforce max_num_msgs = 2 and use max_comb_*_len for length checks */ @@ -711,6 +713,11 @@ struct i2c_adapter_quirks { #define I2C_AQ_NO_ZERO_LEN (I2C_AQ_NO_ZERO_LEN_READ | I2C_AQ_NO_ZERO_LEN_WRITE) /* adapter cannot do repeated START */ #define I2C_AQ_NO_REP_START BIT(7) +/** + * do not check for conflict on a given address + * used accordingly with "struct i2c_adapter_quirks.skip_addr_in_parent" + */ +#define I2C_AQ_SKIP_ADDR_CHECK BIT(8) /* * i2c_adapter is the structure used to identify a physical i2c bus along