hwmon (pmbus) use simple i2c probe function

pmbus_do_probe doesn't use the id information provided in its second
argument, so this can be removed, which then allows using the
single-parameter i2c probe function ("probe_new") for probes.

This avoids scanning the identifier tables during probes.

Drivers which didn't use the id are converted as-is; drivers which did
are modified as follows:

* if the information in i2c_client is sufficient, that's used instead
  (client->name);
* configured v. probed comparisons are performed by comparing the
  configured name to the detected name, instead of the ids; this
  involves strcmp but is still cheaper than comparing all the device
  names when scanning the tables;
* anything else is handled by calling i2c_match_id() with the same
  level of error-handling (if any) as before.

Additionally, the mismatch message in the ltc2978 driver is adjusted
so that it no longer assumes that the driver_data is an index into
ltc2978_id.

Signed-off-by: Stephen Kitt <steve@sk2.org>
Acked-by: Wolfram Sang <wsa@kernel.org>
Link: https://lore.kernel.org/r/20200808210004.30880-1-steve@sk2.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

1 files changed, 3 insertions, 4 deletions

diff --git a/drivers/hwmon/pmbus/ltc3815.c b/drivers/hwmon/pmbus/ltc3815.c
index 3036263e0a66..8328fb367ad6 100644
--- a/drivers/hwmon/pmbus/ltc3815.c
+++ b/drivers/hwmon/pmbus/ltc3815.c
@@ -178,8 +178,7 @@ static struct pmbus_driver_info ltc3815_info = {
 	.write_word_data = ltc3815_write_word_data,
 };
 
-static int ltc3815_probe(struct i2c_client *client,
-			 const struct i2c_device_id *id)
+static int ltc3815_probe(struct i2c_client *client)
 {
 	int chip_id;
 
@@ -193,14 +192,14 @@ static int ltc3815_probe(struct i2c_client *client,
 	if ((chip_id & LTC3815_ID_MASK) != LTC3815_ID)
 		return -ENODEV;
 
-	return pmbus_do_probe(client, id, &ltc3815_info);
+	return pmbus_do_probe(client, &ltc3815_info);
 }
 
 static struct i2c_driver ltc3815_driver = {
 	.driver = {
 		   .name = "ltc3815",
 		   },
-	.probe = ltc3815_probe,
+	.probe_new = ltc3815_probe,
 	.remove = pmbus_do_remove,
 	.id_table = ltc3815_id,
 };