linux-kernel - [PATCH] drivers/i2c: use simple i2c probe

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Date:   Wed, 12 Oct 2022 18:36:47 +0200
From:   Stephen Kitt <steve@....org>
To:     Wolfram Sang <wsa@...nel.org>, Guenter Roeck <linux@...ck-us.net>,
        Peter Rosin <peda@...ntia.se>
Cc:     Stephen Kitt <steve@....org>, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] drivers/i2c: use simple i2c probe

All these drivers have an i2c probe function which doesn't use the
"struct i2c_device_id *id" parameter, so they can trivially be
converted to the "probe_new" style of probe with a single argument.

This is part of an ongoing transition to single-argument i2c probe
functions. Old-style probe functions involve a call to i2c_match_id:
in drivers/i2c/i2c-core-base.c,

         /*
          * 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;

Drivers which don't need the second parameter can be declared using
probe_new instead, avoiding the call to i2c_match_id. Drivers which do
can still be converted to probe_new-style, calling i2c_match_id
themselves (as is done currently for of_match_id).

This change was done using the following Coccinelle script, and fixed
up for whitespace changes:

@ rule1 @
identifier fn;
identifier client, id;
@@

- static int fn(struct i2c_client *client, const struct i2c_device_id *id)
+ static int fn(struct i2c_client *client)
{
...when != id
}

@ rule2 depends on rule1 @
identifier rule1.fn;
identifier driver;
@@

struct i2c_driver driver = {
-       .probe
+       .probe_new
                =
(
                   fn
|
-                  &fn
+                  fn
)
                ,
};

Signed-off-by: Stephen Kitt <steve@....org>
---
 drivers/i2c/i2c-core-base.c         | 5 ++---
 drivers/i2c/i2c-smbus.c             | 5 ++---
 drivers/i2c/muxes/i2c-mux-pca9541.c | 5 ++---
 3 files changed, 6 insertions(+), 9 deletions(-)

diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
index 8c7e3494ca5f..ff64ba2abb6d 100644
--- a/drivers/i2c/i2c-core-base.c
+++ b/drivers/i2c/i2c-core-base.c
@@ -1013,15 +1013,14 @@ static const struct i2c_device_id dummy_id[] = {
 	{ },
 };
 
-static int dummy_probe(struct i2c_client *client,
-		       const struct i2c_device_id *id)
+static int dummy_probe(struct i2c_client *client)
 {
 	return 0;
 }
 
 static struct i2c_driver dummy_driver = {
 	.driver.name	= "dummy",
-	.probe		= dummy_probe,
+	.probe_new	= dummy_probe,
 	.id_table	= dummy_id,
 };
 
diff --git a/drivers/i2c/i2c-smbus.c b/drivers/i2c/i2c-smbus.c
index 07c92c8495a3..f4c74b9135b3 100644
--- a/drivers/i2c/i2c-smbus.c
+++ b/drivers/i2c/i2c-smbus.c
@@ -112,8 +112,7 @@ static void smbalert_work(struct work_struct *work)
 }
 
 /* Setup SMBALERT# infrastructure */
-static int smbalert_probe(struct i2c_client *ara,
-			  const struct i2c_device_id *id)
+static int smbalert_probe(struct i2c_client *ara)
 {
 	struct i2c_smbus_alert_setup *setup = dev_get_platdata(&ara->dev);
 	struct i2c_smbus_alert *alert;
@@ -170,7 +169,7 @@ static struct i2c_driver smbalert_driver = {
 	.driver = {
 		.name	= "smbus_alert",
 	},
-	.probe		= smbalert_probe,
+	.probe_new	= smbalert_probe,
 	.remove		= smbalert_remove,
 	.id_table	= smbalert_ids,
 };
diff --git a/drivers/i2c/muxes/i2c-mux-pca9541.c b/drivers/i2c/muxes/i2c-mux-pca9541.c
index ea83de78f52d..09d1d9e67e31 100644
--- a/drivers/i2c/muxes/i2c-mux-pca9541.c
+++ b/drivers/i2c/muxes/i2c-mux-pca9541.c
@@ -283,8 +283,7 @@ static int pca9541_release_chan(struct i2c_mux_core *muxc, u32 chan)
 /*
  * I2C init/probing/exit functions
  */
-static int pca9541_probe(struct i2c_client *client,
-			 const struct i2c_device_id *id)
+static int pca9541_probe(struct i2c_client *client)
 {
 	struct i2c_adapter *adap = client->adapter;
 	struct i2c_mux_core *muxc;
@@ -337,7 +336,7 @@ static struct i2c_driver pca9541_driver = {
 		   .name = "pca9541",
 		   .of_match_table = of_match_ptr(pca9541_of_match),
 		   },
-	.probe = pca9541_probe,
+	.probe_new = pca9541_probe,
 	.remove = pca9541_remove,
 	.id_table = pca9541_id,
 };

base-commit: 833477fce7a14d43ae4c07f8ddc32fa5119471a2
-- 
2.30.2