7 files changed, 44 insertions, 18 deletions

diff --git a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig
index 96867347bcbf..711ca08ab776 100644
--- a/drivers/i2c/Kconfig
+++ b/drivers/i2c/Kconfig
@@ -38,6 +38,20 @@ config I2C_CHARDEV
           This support is also available as a module.  If so, the module 
           will be called i2c-dev.
 
+config I2C_HELPER_AUTO
+        bool "Autoselect pertinent helper modules"
+        default y
+        help
+          Some I2C bus drivers require so-called "I2C algorithm" modules
+          to work. These are basically software-only abstractions of generic
+          I2C interfaces. This option will autoselect them so that you don't
+          have to care.
+
+          Unselect this only if you need to enable additional helper
+          modules, for example for use with external I2C bus drivers.
+
+          In doubt, say Y.
+
 source drivers/i2c/algos/Kconfig
 source drivers/i2c/busses/Kconfig
 source drivers/i2c/chips/Kconfig
diff --git a/drivers/i2c/algos/Kconfig b/drivers/i2c/algos/Kconfig
index 7137a17402fe..b788579b8227 100644
--- a/drivers/i2c/algos/Kconfig
+++ b/drivers/i2c/algos/Kconfig
@@ -2,15 +2,20 @@
 # I2C algorithm drivers configuration
 #
 
+menu "I2C Algorithms"
+        depends on !I2C_HELPER_AUTO
+
 config I2C_ALGOBIT
-        tristate
+        tristate "I2C bit-banging interfaces"
 
 config I2C_ALGOPCF
-        tristate
+        tristate "I2C PCF 8584 interfaces"
 
 config I2C_ALGOPCA
-        tristate
+        tristate "I2C PCA 9564 interfaces"
 
 config I2C_ALGO_SGI
         tristate
         depends on SGI_IP22 || SGI_IP32 || X86_VISWS
+
+endmenu
diff --git a/drivers/i2c/busses/i2c-amd756-s4882.c b/drivers/i2c/busses/i2c-amd756-s4882.c
index 72872d1e63ef..8ba2bcf727d3 100644
--- a/drivers/i2c/busses/i2c-amd756-s4882.c
+++ b/drivers/i2c/busses/i2c-amd756-s4882.c
@@ -155,6 +155,9 @@ static int __init amd756_s4882_init(void)
         int i, error;
         union i2c_smbus_data ioconfig;
 
+        if (!amd756_smbus.dev.parent)
+                return -ENODEV;
+
         /* Configure the PCA9556 multiplexer */
         ioconfig.byte = 0x00; /* All I/O to output mode */
         error = i2c_smbus_xfer(&amd756_smbus, 0x18, 0, I2C_SMBUS_WRITE, 0x03,
@@ -168,11 +171,7 @@ static int __init amd756_s4882_init(void)
         /* Unregister physical bus */
         error = i2c_del_adapter(&amd756_smbus);
         if (error) {
-                if (error == -EINVAL)
-                        error = -ENODEV;
-                else
-                        dev_err(&amd756_smbus.dev, "Physical bus removal "
-                                "failed\n");
+                dev_err(&amd756_smbus.dev, "Physical bus removal failed\n");
                 goto ERROR0;
         }
 
diff --git a/drivers/i2c/busses/i2c-nforce2-s4985.c b/drivers/i2c/busses/i2c-nforce2-s4985.c
index d1a4cbcf2aa4..29015eb9ca46 100644
--- a/drivers/i2c/busses/i2c-nforce2-s4985.c
+++ b/drivers/i2c/busses/i2c-nforce2-s4985.c
@@ -150,6 +150,9 @@ static int __init nforce2_s4985_init(void)
         int i, error;
         union i2c_smbus_data ioconfig;
 
+        if (!nforce2_smbus)
+                return -ENODEV;
+
         /* Configure the PCA9556 multiplexer */
         ioconfig.byte = 0x00; /* All I/O to output mode */
         error = i2c_smbus_xfer(nforce2_smbus, 0x18, 0, I2C_SMBUS_WRITE, 0x03,
@@ -161,8 +164,6 @@ static int __init nforce2_s4985_init(void)
         }
 
         /* Unregister physical bus */
-        if (!nforce2_smbus)
-                return -ENODEV;
         error = i2c_del_adapter(nforce2_smbus);
         if (error) {
                 dev_err(&nforce2_smbus->dev, "Physical bus removal failed\n");
diff --git a/drivers/i2c/chips/at24.c b/drivers/i2c/chips/at24.c
index e764c94f3e3d..2a4acb269569 100644
--- a/drivers/i2c/chips/at24.c
+++ b/drivers/i2c/chips/at24.c
@@ -188,7 +188,7 @@ static ssize_t at24_eeprom_read(struct at24_data *at24, char *buf,
                         count = I2C_SMBUS_BLOCK_MAX;
                 status = i2c_smbus_read_i2c_block_data(client, offset,
                                 count, buf);
-                dev_dbg(&client->dev, "smbus read %zd@%d --> %d\n",
+                dev_dbg(&client->dev, "smbus read %zu@%d --> %d\n",
                                 count, offset, status);
                 return (status < 0) ? -EIO : status;
         }
@@ -214,7 +214,7 @@ static ssize_t at24_eeprom_read(struct at24_data *at24, char *buf,
         msg[1].len = count;
 
         status = i2c_transfer(client->adapter, msg, 2);
-        dev_dbg(&client->dev, "i2c read %zd@%d --> %d\n",
+        dev_dbg(&client->dev, "i2c read %zu@%d --> %d\n",
                         count, offset, status);
 
         if (status == 2)
@@ -334,7 +334,7 @@ static ssize_t at24_eeprom_write(struct at24_data *at24, char *buf,
                         if (status == 1)
                                 status = count;
                 }
-                dev_dbg(&client->dev, "write %zd@%d --> %zd (%ld)\n",
+                dev_dbg(&client->dev, "write %zu@%d --> %zd (%ld)\n",
                                 count, offset, status, jiffies);
 
                 if (status == count)
@@ -512,7 +512,7 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id)
 
         i2c_set_clientdata(client, at24);
 
-        dev_info(&client->dev, "%Zd byte %s EEPROM %s\n",
+        dev_info(&client->dev, "%zu byte %s EEPROM %s\n",
                 at24->bin.size, client->name,
                 writable ? "(writable)" : "(read-only)");
         dev_dbg(&client->dev,
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 7bf38c418086..550853f79ae8 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -813,7 +813,12 @@ static int i2c_check_addr(struct i2c_adapter *adapter, int addr)
 int i2c_attach_client(struct i2c_client *client)
 {
         struct i2c_adapter *adapter = client->adapter;
-        int res = 0;
+        int res;
+
+        /* Check for address business */
+        res = i2c_check_addr(adapter, client->addr);
+        if (res)
+                return res;
 
         client->dev.parent = &client->adapter->dev;
         client->dev.bus = &i2c_bus_type;
@@ -1451,9 +1456,11 @@ i2c_new_probed_device(struct i2c_adapter *adap,
                 if ((addr_list[i] & ~0x07) == 0x30
                  || (addr_list[i] & ~0x0f) == 0x50
                  || !i2c_check_functionality(adap, I2C_FUNC_SMBUS_QUICK)) {
+                        union i2c_smbus_data data;
+
                         if (i2c_smbus_xfer(adap, addr_list[i], 0,
                                            I2C_SMBUS_READ, 0,
-                                           I2C_SMBUS_BYTE, NULL) >= 0)
+                                           I2C_SMBUS_BYTE, &data) >= 0)
                                 break;
                 } else {
                         if (i2c_smbus_xfer(adap, addr_list[i], 0,
diff --git a/drivers/i2c/i2c-dev.c b/drivers/i2c/i2c-dev.c
index 9d55c6383b23..af4491fa7e34 100644
--- a/drivers/i2c/i2c-dev.c
+++ b/drivers/i2c/i2c-dev.c
@@ -147,7 +147,7 @@ static ssize_t i2cdev_read (struct file *file, char __user *buf, size_t count,
         if (tmp==NULL)
                 return -ENOMEM;
 
-        pr_debug("i2c-dev: i2c-%d reading %zd bytes.\n",
+        pr_debug("i2c-dev: i2c-%d reading %zu bytes.\n",
                 iminor(file->f_path.dentry->d_inode), count);
 
         ret = i2c_master_recv(client,tmp,count);
@@ -175,7 +175,7 @@ static ssize_t i2cdev_write (struct file *file, const char __user *buf, size_t c
                 return -EFAULT;
         }
 
-        pr_debug("i2c-dev: i2c-%d writing %zd bytes.\n",
+        pr_debug("i2c-dev: i2c-%d writing %zu bytes.\n",
                 iminor(file->f_path.dentry->d_inode), count);
 
         ret = i2c_master_send(client,tmp,count);