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>

Documentation/hwmon/pmbus-core.rst

@@ -270,8 +270,7 @@ obtain the chip status. Therefore, it must _not_ be called from that function.
 
 ::
 
-  int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id,
-		     struct pmbus_driver_info *info);
+  int pmbus_do_probe(struct i2c_client *client, struct pmbus_driver_info *info);
 
 Execute probe function. Similar to standard probe function for other drivers,
 with the pointer to struct pmbus_driver_info as additional argument. Calls

Documentation/hwmon/pmbus.rst

@@ -143,10 +143,9 @@ Emerson DS1200 power modules might look as follows::
 		   | PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12,
   };
 
-  static int ds1200_probe(struct i2c_client *client,
-			  const struct i2c_device_id *id)
+  static int ds1200_probe(struct i2c_client *client)
   {
-	return pmbus_do_probe(client, id, &ds1200_info);
+	return pmbus_do_probe(client, &ds1200_info);
   }
 
   static int ds1200_remove(struct i2c_client *client)
@@ -166,7 +165,7 @@ Emerson DS1200 power modules might look as follows::
 	.driver = {
 		   .name = "ds1200",
 		   },
-	.probe = ds1200_probe,
+	.probe_new = ds1200_probe,
 	.remove = ds1200_remove,
 	.id_table = ds1200_id,
   };

drivers/hwmon/pmbus/adm1275.c

@@ -462,8 +462,7 @@ static const struct i2c_device_id adm1275_id[] = {
 };
 MODULE_DEVICE_TABLE(i2c, adm1275_id);
 
-static int adm1275_probe(struct i2c_client *client,
-			 const struct i2c_device_id *id)
+static int adm1275_probe(struct i2c_client *client)
 {
 	s32 (*config_read_fn)(const struct i2c_client *client, u8 reg);
 	u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
@@ -506,10 +505,10 @@ static int adm1275_probe(struct i2c_client *client,
 		return -ENODEV;
 	}
 
-	if (id->driver_data != mid->driver_data)
+	if (strcmp(client->name, mid->name) != 0)
 		dev_notice(&client->dev,
 			   "Device mismatch: Configured %s, detected %s\n",
-			   id->name, mid->name);
+			   client->name, mid->name);
 
 	if (mid->driver_data == adm1272 || mid->driver_data == adm1278 ||
 	    mid->driver_data == adm1293 || mid->driver_data == adm1294)
@@ -790,14 +789,14 @@ static int adm1275_probe(struct i2c_client *client,
 		info->R[PSC_TEMPERATURE] = coefficients[tindex].R;
 	}
 
-	return pmbus_do_probe(client, id, info);
+	return pmbus_do_probe(client, info);
 }
 
 static struct i2c_driver adm1275_driver = {
 	.driver = {
 		   .name = "adm1275",
 		   },
-	.probe = adm1275_probe,
+	.probe_new = adm1275_probe,
 	.remove = pmbus_do_remove,
 	.id_table = adm1275_id,
 };

drivers/hwmon/pmbus/bel-pfe.c

@@ -87,12 +87,13 @@ static struct pmbus_driver_info pfe_driver_info[] = {
 	},
 };
 
-static int pfe_pmbus_probe(struct i2c_client *client,
-			   const struct i2c_device_id *id)
+static const struct i2c_device_id pfe_device_id[];
+
+static int pfe_pmbus_probe(struct i2c_client *client)
 {
 	int model;
 
-	model = (int)id->driver_data;
+	model = (int)i2c_match_id(pfe_device_id, client)->driver_data;
 
 	/*
 	 * PFE3000-12-069RA devices may not stay in page 0 during device
@@ -104,7 +105,7 @@ static int pfe_pmbus_probe(struct i2c_client *client,
 		i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0);
 	}
 
-	return pmbus_do_probe(client, id, &pfe_driver_info[model]);
+	return pmbus_do_probe(client, &pfe_driver_info[model]);
 }
 
 static const struct i2c_device_id pfe_device_id[] = {
@@ -119,7 +120,7 @@ static struct i2c_driver pfe_pmbus_driver = {
 	.driver = {
 		   .name = "bel-pfe",
 	},
-	.probe = pfe_pmbus_probe,
+	.probe_new = pfe_pmbus_probe,
 	.remove = pmbus_do_remove,
 	.id_table = pfe_device_id,
 };

drivers/hwmon/pmbus/ibm-cffps.c

@@ -91,6 +91,8 @@ struct ibm_cffps {
 	struct led_classdev led;
 };
 
+static const struct i2c_device_id ibm_cffps_id[];
+
 #define to_psu(x, y) container_of((x), struct ibm_cffps, debugfs_entries[(y)])
 
 static ssize_t ibm_cffps_read_input_history(struct ibm_cffps *psu,
@@ -473,20 +475,23 @@ static struct pmbus_platform_data ibm_cffps_pdata = {
 	.flags = PMBUS_SKIP_STATUS_CHECK,
 };
 
-static int ibm_cffps_probe(struct i2c_client *client,
-			   const struct i2c_device_id *id)
+static int ibm_cffps_probe(struct i2c_client *client)
 {
 	int i, rc;
 	enum versions vs = cffps_unknown;
 	struct dentry *debugfs;
 	struct dentry *ibm_cffps_dir;
 	struct ibm_cffps *psu;
 	const void *md = of_device_get_match_data(&client->dev);
+	const struct i2c_device_id *id;
 
-	if (md)
+	if (md) {
 		vs = (enum versions)md;
-	else if (id)
-		vs = (enum versions)id->driver_data;
+	} else {
+		id = i2c_match_id(ibm_cffps_id, client);
+		if (id)
+			vs = (enum versions)id->driver_data;
+	}
 
 	if (vs == cffps_unknown) {
 		u16 ccin_revision = 0;
@@ -519,7 +524,7 @@ static int ibm_cffps_probe(struct i2c_client *client,
 	}
 
 	client->dev.platform_data = &ibm_cffps_pdata;
-	rc = pmbus_do_probe(client, id, &ibm_cffps_info[vs]);
+	rc = pmbus_do_probe(client, &ibm_cffps_info[vs]);
 	if (rc)
 		return rc;
 
@@ -611,7 +616,7 @@ static struct i2c_driver ibm_cffps_driver = {
 		.name = "ibm-cffps",
 		.of_match_table = ibm_cffps_of_match,
 	},
-	.probe = ibm_cffps_probe,
+	.probe_new = ibm_cffps_probe,
 	.remove = pmbus_do_remove,
 	.id_table = ibm_cffps_id,
 };

drivers/hwmon/pmbus/inspur-ipsps.c

@@ -190,11 +190,10 @@ static struct pmbus_platform_data ipsps_pdata = {
 	.flags = PMBUS_SKIP_STATUS_CHECK,
 };
 
-static int ipsps_probe(struct i2c_client *client,
-		       const struct i2c_device_id *id)
+static int ipsps_probe(struct i2c_client *client)
 {
 	client->dev.platform_data = &ipsps_pdata;
-	return pmbus_do_probe(client, id, &ipsps_info);
+	return pmbus_do_probe(client, &ipsps_info);
 }
 
 static const struct i2c_device_id ipsps_id[] = {
@@ -216,7 +215,7 @@ static struct i2c_driver ipsps_driver = {
 		.name = "inspur-ipsps",
 		.of_match_table = of_match_ptr(ipsps_of_match),
 	},
-	.probe = ipsps_probe,
+	.probe_new = ipsps_probe,
 	.remove = pmbus_do_remove,
 	.id_table = ipsps_id,
 };

drivers/hwmon/pmbus/ir35221.c

@@ -67,8 +67,7 @@ static int ir35221_read_word_data(struct i2c_client *client, int page,
 	return ret;
 }
 
-static int ir35221_probe(struct i2c_client *client,
-			 const struct i2c_device_id *id)
+static int ir35221_probe(struct i2c_client *client)
 {
 	struct pmbus_driver_info *info;
 	u8 buf[I2C_SMBUS_BLOCK_MAX];
@@ -123,7 +122,7 @@ static int ir35221_probe(struct i2c_client *client,
 		| PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP;
 	info->func[1] = info->func[0];
 
-	return pmbus_do_probe(client, id, info);
+	return pmbus_do_probe(client, info);
 }
 
 static const struct i2c_device_id ir35221_id[] = {
@@ -137,7 +136,7 @@ static struct i2c_driver ir35221_driver = {
 	.driver = {
 		.name	= "ir35221",
 	},
-	.probe		= ir35221_probe,
+	.probe_new	= ir35221_probe,
 	.remove		= pmbus_do_remove,
 	.id_table	= ir35221_id,
 };

drivers/hwmon/pmbus/ir38064.c

@@ -35,10 +35,9 @@ static struct pmbus_driver_info ir38064_info = {
 	    | PMBUS_HAVE_POUT,
 };
 
-static int ir38064_probe(struct i2c_client *client,
-			 const struct i2c_device_id *id)
+static int ir38064_probe(struct i2c_client *client)
 {
-	return pmbus_do_probe(client, id, &ir38064_info);
+	return pmbus_do_probe(client, &ir38064_info);
 }
 
 static const struct i2c_device_id ir38064_id[] = {
@@ -53,7 +52,7 @@ static struct i2c_driver ir38064_driver = {
 	.driver = {
 		   .name = "ir38064",
 		   },
-	.probe = ir38064_probe,
+	.probe_new = ir38064_probe,
 	.remove = pmbus_do_remove,
 	.id_table = ir38064_id,
 };

drivers/hwmon/pmbus/irps5401.c

@@ -38,10 +38,9 @@ static struct pmbus_driver_info irps5401_info = {
 	.func[4] = IRPS5401_LDO_FUNC,
 };
 
-static int irps5401_probe(struct i2c_client *client,
-			  const struct i2c_device_id *id)
+static int irps5401_probe(struct i2c_client *client)
 {
-	return pmbus_do_probe(client, id, &irps5401_info);
+	return pmbus_do_probe(client, &irps5401_info);
 }
 
 static const struct i2c_device_id irps5401_id[] = {
@@ -55,7 +54,7 @@ static struct i2c_driver irps5401_driver = {
 	.driver = {
 		   .name = "irps5401",
 		   },
-	.probe = irps5401_probe,
+	.probe_new = irps5401_probe,
 	.remove = pmbus_do_remove,
 	.id_table = irps5401_id,
 };

drivers/hwmon/pmbus/isl68137.c

@@ -72,6 +72,8 @@ enum variants {
 	raa_dmpvr2_hv,
 };
 
+static const struct i2c_device_id raa_dmpvr_id[];
+
 static ssize_t isl68137_avs_enable_show_page(struct i2c_client *client,
 					     int page,
 					     char *buf)
@@ -218,8 +220,7 @@ static struct pmbus_driver_info raa_dmpvr_info = {
 	    | PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_POUT,
 };
 
-static int isl68137_probe(struct i2c_client *client,
-			  const struct i2c_device_id *id)
+static int isl68137_probe(struct i2c_client *client)
 {
 	struct pmbus_driver_info *info;
 
@@ -228,7 +229,7 @@ static int isl68137_probe(struct i2c_client *client,
 		return -ENOMEM;
 	memcpy(info, &raa_dmpvr_info, sizeof(*info));
 
-	switch (id->driver_data) {
+	switch (i2c_match_id(raa_dmpvr_id, client)->driver_data) {
 	case raa_dmpvr1_2rail:
 		info->pages = 2;
 		info->R[PSC_VOLTAGE_IN] = 3;
@@ -267,7 +268,7 @@ static int isl68137_probe(struct i2c_client *client,
 		return -ENODEV;
 	}
 
-	return pmbus_do_probe(client, id, info);
+	return pmbus_do_probe(client, info);
 }
 
 static const struct i2c_device_id raa_dmpvr_id[] = {
@@ -322,7 +323,7 @@ static struct i2c_driver isl68137_driver = {
 	.driver = {
 		   .name = "isl68137",
 		   },
-	.probe = isl68137_probe,
+	.probe_new = isl68137_probe,
 	.remove = pmbus_do_remove,
 	.id_table = raa_dmpvr_id,
 };

drivers/hwmon/pmbus/lm25066.c

@@ -211,6 +211,8 @@ struct lm25066_data {
 
 #define to_lm25066_data(x)  container_of(x, struct lm25066_data, info)
 
+static const struct i2c_device_id lm25066_id[];
+
 static int lm25066_read_word_data(struct i2c_client *client, int page,
 				  int phase, int reg)
 {
@@ -416,8 +418,7 @@ static int lm25066_write_word_data(struct i2c_client *client, int page, int reg,
 	return ret;
 }
 
-static int lm25066_probe(struct i2c_client *client,
-			  const struct i2c_device_id *id)
+static int lm25066_probe(struct i2c_client *client)
 {
 	int config;
 	struct lm25066_data *data;
@@ -437,7 +438,7 @@ static int lm25066_probe(struct i2c_client *client,
 	if (config < 0)
 		return config;
 
-	data->id = id->driver_data;
+	data->id = i2c_match_id(lm25066_id, client)->driver_data;
 	info = &data->info;
 
 	info->pages = 1;
@@ -487,7 +488,7 @@ static int lm25066_probe(struct i2c_client *client,
 		info->b[PSC_POWER] = coeff[PSC_POWER].b;
 	}
 
-	return pmbus_do_probe(client, id, info);
+	return pmbus_do_probe(client, info);
 }
 
 static const struct i2c_device_id lm25066_id[] = {
@@ -506,7 +507,7 @@ static struct i2c_driver lm25066_driver = {
 	.driver = {
 		   .name = "lm25066",
 		   },
-	.probe = lm25066_probe,
+	.probe_new = lm25066_probe,
 	.remove = pmbus_do_remove,
 	.id_table = lm25066_id,
 };

drivers/hwmon/pmbus/ltc2978.c

@@ -649,12 +649,12 @@ static int ltc2978_get_id(struct i2c_client *client)
 	return -ENODEV;
 }
 
-static int ltc2978_probe(struct i2c_client *client,
-			 const struct i2c_device_id *id)
+static int ltc2978_probe(struct i2c_client *client)
 {
 	int i, chip_id;
 	struct ltc2978_data *data;
 	struct pmbus_driver_info *info;
+	const struct i2c_device_id *id;
 
 	if (!i2c_check_functionality(client->adapter,
 				     I2C_FUNC_SMBUS_READ_WORD_DATA))
@@ -670,11 +670,13 @@ static int ltc2978_probe(struct i2c_client *client,
 		return chip_id;
 
 	data->id = chip_id;
+	id = i2c_match_id(ltc2978_id, client);
 	if (data->id != id->driver_data)
 		dev_warn(&client->dev,
-			 "Device mismatch: Configured %s, detected %s\n",
+			 "Device mismatch: Configured %s (%d), detected %d\n",
 			 id->name,
-			 ltc2978_id[data->id].name);
+			 (int) id->driver_data,
+			 chip_id);
 
 	info = &data->info;
 	info->write_word_data = ltc2978_write_word_data;
@@ -832,7 +834,7 @@ static int ltc2978_probe(struct i2c_client *client,
 	}
 #endif
 
-	return pmbus_do_probe(client, id, info);
+	return pmbus_do_probe(client, info);
 }
 
 
@@ -872,7 +874,7 @@ static struct i2c_driver ltc2978_driver = {
 		   .name = "ltc2978",
 		   .of_match_table = of_match_ptr(ltc2978_of_match),
 		   },
-	.probe = ltc2978_probe,
+	.probe_new = ltc2978_probe,
 	.remove = pmbus_do_remove,
 	.id_table = ltc2978_id,
 };