i2c: Shrink struct i2c_client

This shrinks the size of "struct i2c_client" by 40 bytes:

 - Substantially shrinks the string used to identify the chip type
 - The "flags" don't need to be so big
 - Removes some internal padding

It also adds kerneldoc for that struct, explaining how "name" is really a
chip type identifier; it's otherwise potentially confusing.

Because the I2C_NAME_SIZE symbol was abused for both i2c_client.name
and for i2c_adapter.name, this needed to affect i2c_adapter too.  The
adapters which used that symbol now use the more-obviously-correct
idiom of taking the size of that field.

JD: Shorten i2c_adapter.name from 50 to 48 bytes while we're here, to
avoid wasting space in padding.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

drivers/i2c/busses/i2c-ali1535.c

@@ -497,7 +497,7 @@ static int __devinit ali1535_probe(struct pci_dev *dev, const struct pci_device_
 	/* set up the sysfs linkage to our parent device */
 	ali1535_adapter.dev.parent = &dev->dev;
 
-	snprintf(ali1535_adapter.name, I2C_NAME_SIZE, 
+	snprintf(ali1535_adapter.name, sizeof(ali1535_adapter.name),
 		"SMBus ALI1535 adapter at %04x", ali1535_smba);
 	return i2c_add_adapter(&ali1535_adapter);
 }

drivers/i2c/busses/i2c-ali15x3.c

@@ -492,7 +492,7 @@ static int __devinit ali15x3_probe(struct pci_dev *dev, const struct pci_device_
 	/* set up the sysfs linkage to our parent device */
 	ali15x3_adapter.dev.parent = &dev->dev;
 
-	snprintf(ali15x3_adapter.name, I2C_NAME_SIZE,
+	snprintf(ali15x3_adapter.name, sizeof(ali15x3_adapter.name),
 		"SMBus ALI15X3 adapter at %04x", ali15x3_smba);
 	return i2c_add_adapter(&ali15x3_adapter);
 }

drivers/i2c/busses/i2c-amd8111.c

@@ -365,7 +365,7 @@ static int __devinit amd8111_probe(struct pci_dev *dev,
 	}
 
 	smbus->adapter.owner = THIS_MODULE;
-	snprintf(smbus->adapter.name, I2C_NAME_SIZE,
+	snprintf(smbus->adapter.name, sizeof(smbus->adapter.name),
 		"SMBus2 AMD8111 adapter at %04x", smbus->base);
 	smbus->adapter.id = I2C_HW_SMBUS_AMD8111;
 	smbus->adapter.class = I2C_CLASS_HWMON;

drivers/i2c/busses/i2c-i801.c

@@ -527,7 +527,7 @@ static int __devinit i801_probe(struct pci_dev *dev, const struct pci_device_id
 	/* set up the sysfs linkage to our parent device */
 	i801_adapter.dev.parent = &dev->dev;
 
-	snprintf(i801_adapter.name, I2C_NAME_SIZE,
+	snprintf(i801_adapter.name, sizeof(i801_adapter.name),
 		"SMBus I801 adapter at %04lx", i801_smba);
 	err = i2c_add_adapter(&i801_adapter);
 	if (err) {

drivers/i2c/busses/i2c-ixp2000.c

@@ -118,7 +118,7 @@ static int ixp2000_i2c_probe(struct platform_device *plat_dev)
 
 	drv_data->adapter.id = I2C_HW_B_IXP2000,
 	strlcpy(drv_data->adapter.name, plat_dev->dev.driver->name,
-		I2C_NAME_SIZE);
+		sizeof(drv_data->adapter.name));
 	drv_data->adapter.algo_data = &drv_data->algo_data,
 
 	drv_data->adapter.dev.parent = &plat_dev->dev;

drivers/i2c/busses/i2c-ixp4xx.c

@@ -127,7 +127,7 @@ static int ixp4xx_i2c_probe(struct platform_device *plat_dev)
 	drv_data->adapter.id = I2C_HW_B_IXP4XX;
 	drv_data->adapter.class = I2C_CLASS_HWMON;
 	strlcpy(drv_data->adapter.name, plat_dev->dev.driver->name,
-		I2C_NAME_SIZE);
+		sizeof(drv_data->adapter.name));
 	drv_data->adapter.algo_data = &drv_data->algo_data;
 
 	drv_data->adapter.dev.parent = &plat_dev->dev;

drivers/i2c/busses/i2c-mv64xxx.c

@@ -508,7 +508,7 @@ mv64xxx_i2c_probe(struct platform_device *pd)
 	}
 
 	strlcpy(drv_data->adapter.name, MV64XXX_I2C_CTLR_NAME " adapter",
-		I2C_NAME_SIZE);
+		sizeof(drv_data->adapter.name));
 
 	init_waitqueue_head(&drv_data->waitq);
 	spin_lock_init(&drv_data->lock);

drivers/i2c/busses/i2c-nforce2.c

@@ -240,7 +240,7 @@ static int __devinit nforce2_probe_smb (struct pci_dev *dev, int bar,
 	smbus->adapter.algo = &smbus_algorithm;
 	smbus->adapter.algo_data = smbus;
 	smbus->adapter.dev.parent = &dev->dev;
-	snprintf(smbus->adapter.name, I2C_NAME_SIZE,
+	snprintf(smbus->adapter.name, sizeof(smbus->adapter.name),
 		"SMBus nForce2 adapter at %04x", smbus->base);
 
 	error = i2c_add_adapter(&smbus->adapter);

drivers/i2c/busses/i2c-pasemi.c

@@ -358,7 +358,7 @@ static int __devinit pasemi_smb_probe(struct pci_dev *dev,
 	}
 
 	smbus->adapter.owner = THIS_MODULE;
-	snprintf(smbus->adapter.name, I2C_NAME_SIZE,
+	snprintf(smbus->adapter.name, sizeof(smbus->adapter.name),
 		 "PA Semi SMBus adapter at 0x%lx", smbus->base);
 	smbus->adapter.class = I2C_CLASS_HWMON;
 	smbus->adapter.algo = &smbus_algorithm;

drivers/i2c/busses/i2c-piix4.c

@@ -428,7 +428,7 @@ static int __devinit piix4_probe(struct pci_dev *dev,
 	/* set up the sysfs linkage to our parent device */
 	piix4_adapter.dev.parent = &dev->dev;
 
-	snprintf(piix4_adapter.name, I2C_NAME_SIZE,
+	snprintf(piix4_adapter.name, sizeof(piix4_adapter.name),
 		"SMBus PIIX4 adapter at %04x", piix4_smba);
 
 	if ((retval = i2c_add_adapter(&piix4_adapter))) {

drivers/i2c/busses/i2c-sis96x.c

@@ -300,7 +300,7 @@ static int __devinit sis96x_probe(struct pci_dev *dev,
 	/* set up the sysfs linkage to our parent device */
 	sis96x_adapter.dev.parent = &dev->dev;
 
-	snprintf(sis96x_adapter.name, I2C_NAME_SIZE,
+	snprintf(sis96x_adapter.name, sizeof(sis96x_adapter.name),
 		"SiS96x SMBus adapter at 0x%04x", sis96x_smbus_base);
 
 	if ((retval = i2c_add_adapter(&sis96x_adapter))) {

drivers/i2c/busses/i2c-viapro.c

@@ -404,7 +404,7 @@ found:
 	}
 
 	vt596_adapter.dev.parent = &pdev->dev;
-	snprintf(vt596_adapter.name, I2C_NAME_SIZE,
+	snprintf(vt596_adapter.name, sizeof(vt596_adapter.name),
 		 "SMBus Via Pro adapter at %04x", vt596_smba);
 
 	vt596_pdev = pci_dev_get(pdev);

drivers/i2c/busses/scx200_acb.c

@@ -441,7 +441,7 @@ static __init struct scx200_acb_iface *scx200_create_iface(const char *text,
 
 	adapter = &iface->adapter;
 	i2c_set_adapdata(adapter, iface);
-	snprintf(adapter->name, I2C_NAME_SIZE, "%s ACB%d", text, index);
+	snprintf(adapter->name, sizeof(adapter->name), "%s ACB%d", text, index);
 	adapter->owner = THIS_MODULE;
 	adapter->id = I2C_HW_SMBUS_SCX200;
 	adapter->algo = &scx200_acb_algorithm;