From b8a1a4cd5a98a2adf8dfd6902cd98e57d910ee12 Mon Sep 17 00:00:00 2001 From: Lee Jones Date: Mon, 7 Nov 2016 12:47:41 +0000 Subject: [PATCH] i2c: Provide a temporary .probe_new() call-back type This will aid the seamless removal of the current probe()'s, more commonly unused than used second parameter. Most I2C drivers can simply switch over to the new interface, others which have DT support can use its own matching instead and others can call i2c_match_id() themselves. This brings I2C's device probe method into line with other similar interfaces in the kernel and prevents the requirement to pass an i2c_device_id table. Suggested-by: Grant Likely Signed-off-by: Lee Jones [Kieran: fix rebase conflicts and adapt for dev_pm_domain_{attach,detach}] Tested-by: Kieran Bingham Reviewed-by: Javier Martinez Canillas Tested-by: Javier Martinez Canillas Signed-off-by: Kieran Bingham Signed-off-by: Wolfram Sang --- drivers/i2c/i2c-core.c | 15 ++++++++++++--- include/linux/i2c.h | 8 +++++++- 2 files changed, 19 insertions(+), 4 deletions(-) diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c index 52b2cd4ac8b2..8b93a262e237 100644 --- a/drivers/i2c/i2c-core.c +++ b/drivers/i2c/i2c-core.c @@ -924,8 +924,6 @@ static int i2c_device_probe(struct device *dev) } driver = to_i2c_driver(dev->driver); - if (!driver->probe) - return -EINVAL; /* * An I2C ID table is not mandatory, if and only if, a suitable Device @@ -967,7 +965,18 @@ static int i2c_device_probe(struct device *dev) if (status == -EPROBE_DEFER) goto err_clear_wakeup_irq; - status = driver->probe(client, i2c_match_id(driver->id_table, client)); + /* + * When there are no more users of probe(), + * rename probe_new to probe. + */ + if (driver->probe_new) + status = driver->probe_new(client); + else if (driver->probe) + status = driver->probe(client, + i2c_match_id(driver->id_table, client)); + else + status = -EINVAL; + if (status) goto err_detach_pm_domain; diff --git a/include/linux/i2c.h b/include/linux/i2c.h index 7e00efd6a62f..82cf90945bb8 100644 --- a/include/linux/i2c.h +++ b/include/linux/i2c.h @@ -135,7 +135,8 @@ enum i2c_alert_protocol { * struct i2c_driver - represent an I2C device driver * @class: What kind of i2c device we instantiate (for detect) * @attach_adapter: Callback for bus addition (deprecated) - * @probe: Callback for device binding + * @probe: Callback for device binding - soon to be deprecated + * @probe_new: New callback for device binding * @remove: Callback for device unbinding * @shutdown: Callback for device shutdown * @alert: Alert callback, for example for the SMBus alert protocol @@ -178,6 +179,11 @@ struct i2c_driver { int (*probe)(struct i2c_client *, const struct i2c_device_id *); int (*remove)(struct i2c_client *); + /* New driver model interface to aid the seamless removal of the + * current probe()'s, more commonly unused than used second parameter. + */ + int (*probe_new)(struct i2c_client *); + /* driver model interfaces that don't relate to enumeration */ void (*shutdown)(struct i2c_client *); -- 2.11.0