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| author | Wolfram Sang <wsa+renesas@sang-engineering.com> | 2015-05-14 14:40:05 +0200 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2015-06-01 01:22:50 +0200 |
| commit | 0c7cab96ec413a69af86965d94fb650f01c5887a (patch) | |
| tree | e281329d38ceb0988e9c7b701aa2bb07b0ce8b95 /drivers/i2c | |
| parent | i2c: slave: docs: be more precise about the prerequsites (diff) | |
| download | linux-0c7cab96ec413a69af86965d94fb650f01c5887a.tar.xz linux-0c7cab96ec413a69af86965d94fb650f01c5887a.zip | |
i2c: slave: add error messages to slave core
Inform users what went wrong from the core, so drivers don't have to do
it.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/i2c-core.c | 22 |
1 files changed, 17 insertions, 5 deletions
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c index 987c124432c5..2a627eb0365b 100644 --- a/drivers/i2c/i2c-core.c +++ b/drivers/i2c/i2c-core.c @@ -2914,18 +2914,24 @@ int i2c_slave_register(struct i2c_client *client, i2c_slave_cb_t slave_cb) { int ret; - if (!client || !slave_cb) + if (!client || !slave_cb) { + WARN(1, "insufficent data\n"); return -EINVAL; + } if (!(client->flags & I2C_CLIENT_TEN)) { /* Enforce stricter address checking */ ret = i2c_check_addr_validity(client->addr); - if (ret) + if (ret) { + dev_err(&client->dev, "%s: invalid address\n", __func__); return ret; + } } - if (!client->adapter->algo->reg_slave) + if (!client->adapter->algo->reg_slave) { + dev_err(&client->dev, "%s: not supported by adapter\n", __func__); return -EOPNOTSUPP; + } client->slave_cb = slave_cb; @@ -2933,8 +2939,10 @@ int i2c_slave_register(struct i2c_client *client, i2c_slave_cb_t slave_cb) ret = client->adapter->algo->reg_slave(client); i2c_unlock_adapter(client->adapter); - if (ret) + if (ret) { client->slave_cb = NULL; + dev_err(&client->dev, "%s: adapter returned error %d\n", __func__, ret); + } return ret; } @@ -2944,8 +2952,10 @@ int i2c_slave_unregister(struct i2c_client *client) { int ret; - if (!client->adapter->algo->unreg_slave) + if (!client->adapter->algo->unreg_slave) { + dev_err(&client->dev, "%s: not supported by adapter\n", __func__); return -EOPNOTSUPP; + } i2c_lock_adapter(client->adapter); ret = client->adapter->algo->unreg_slave(client); @@ -2953,6 +2963,8 @@ int i2c_slave_unregister(struct i2c_client *client) if (ret == 0) client->slave_cb = NULL; + else + dev_err(&client->dev, "%s: adapter returned error %d\n", __func__, ret); return ret; } |