linux-kernel - [PATCHv5 6/8] i2c: Provide a temporary .probe

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Date:	Wed,  4 May 2016 16:14:46 +0100
From:	Kieran Bingham <kieran@...uared.org.uk>
To:	Wolfram Sang <wsa@...-dreams.de>, Lee Jones <lee.jones@...aro.org>,
	javier@....samsung.com
Cc:	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
	grant.likely@...aro.org, sameo@...ux.intel.com,
	Kieran Bingham <kieran@...uared.org.uk>
Subject: [PATCHv5 6/8] i2c: Provide a temporary .probe_new() call-back type

From: Lee Jones <lee.jones@...aro.org>

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 <grant.likely@...aro.org>
Signed-off-by: Lee Jones <lee.jones@...aro.org>
[Kieran: fix rebase conflicts and adapt for dev_pm_domain_{attach,detach}]
Signed-off-by: Kieran Bingham <kieran@...gham.xyz>
Tested-by: Kieran Bingham <kieran@...gham.xyz>
---
Changes since v4 [Kieran]
 - Rename .probe2 to probe_new
 - Checkpatch warnings fixed
---
 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 64d543b041b1..268fec3b6931 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -697,8 +697,6 @@ 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
@@ -740,7 +738,18 @@ 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 e3aa3f5e59a8..c8f73b9f51fe 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -130,7 +130,8 @@ i2c_smbus_read_i2c_block_data_or_emulated(const struct i2c_client *client,
  * 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
@@ -173,6 +174,11 @@ 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 *);
 
-- 
2.5.0