From 0c7cab96ec413a69af86965d94fb650f01c5887a Mon Sep 17 00:00:00 2001 From: Wolfram Sang Date: Thu, 14 May 2015 14:40:05 +0200 Subject: 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 Acked-by: Geert Uytterhoeven Signed-off-by: Wolfram Sang --- drivers/i2c/i2c-core.c | 22 +++++++++++++++++----- 1 file changed, 17 insertions(+), 5 deletions(-) (limited to 'drivers') 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; } -- cgit v1.2.3