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Subject[PATCH 2/3] i2c-piix4: separate registration and probing code
Date
Some chipsets have multiple sets of SMBus registers each controlling a
separate SMBus. Supporting these chipsets properly will require registering
multiple I2C adapters for one piix4.

The code to initialize and register the i2c_adapter structure has been
separated from piix4_probe and allows registration of a piix4 adapter
given its base address. Note that the i2c_adapter and piix4_adapdata
structures are now dynamically allocated.

Signed-off-by: Andrew Armenia <andrew@asquaredlabs.com>
---
drivers/i2c/busses/i2c-piix4.c | 79 ++++++++++++++++++++++++++--------------
1 file changed, 51 insertions(+), 28 deletions(-)
diff --git a/drivers/i2c/busses/i2c-piix4.c b/drivers/i2c/busses/i2c-piix4.c
index 7a5889c..8a87b3f 100644
--- a/drivers/i2c/busses/i2c-piix4.c
+++ b/drivers/i2c/busses/i2c-piix4.c
@@ -480,16 +480,6 @@ static const struct i2c_algorithm smbus_algorithm = {
.functionality = piix4_func,
};

-static struct i2c_adapter piix4_adapter = {
- .owner = THIS_MODULE,
- .class = I2C_CLASS_HWMON | I2C_CLASS_SPD,
- .algo = &smbus_algorithm,
-};
-
-static struct i2c_piix4_adapdata piix4_adapter_data = {
- .smba = 0,
-};
-
static DEFINE_PCI_DEVICE_TABLE(piix4_ids) = {
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_3) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443MX_3) },
@@ -514,6 +504,48 @@ static DEFINE_PCI_DEVICE_TABLE(piix4_ids) = {

MODULE_DEVICE_TABLE (pci, piix4_ids);

+static struct i2c_adapter *piix4_main_adapter;
+
+/* register piix4 I2C adapter at the given base address */
+static int piix4_add_adapter(struct pci_dev *dev, unsigned short smba,
+ struct i2c_adapter **padap) {
+ struct i2c_adapter *piix4_adapter;
+ struct i2c_piix4_adapdata *piix4_adapdata;
+ int retval;
+
+ piix4_adapter = kmalloc(sizeof(*piix4_adapter), GFP_KERNEL);
+ memset(piix4_adapter, 0, sizeof(*piix4_adapter));
+ piix4_adapter->owner = THIS_MODULE;
+ piix4_adapter->class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
+ piix4_adapter->algo = &smbus_algorithm;
+
+ piix4_adapdata = kmalloc(sizeof(*piix4_adapdata), GFP_KERNEL);
+ memset(piix4_adapdata, 0, sizeof(*piix4_adapdata));
+ piix4_adapdata->smba = smba;
+
+ /* set up the sysfs linkage to our parent device */
+ piix4_adapter->dev.parent = &dev->dev;
+
+ snprintf(piix4_adapter->name, sizeof(piix4_adapter->name),
+ "SMBus PIIX4 adapter at %04x", smba);
+
+ piix4_adapdata->smba = smba;
+
+ i2c_set_adapdata(piix4_adapter, piix4_adapdata);
+
+ retval = i2c_add_adapter(piix4_adapter);
+ if (retval) {
+ dev_err(&dev->dev, "Couldn't register adapter!\n");
+ release_region(smba, SMBIOSIZE);
+ kfree(piix4_adapdata);
+ kfree(piix4_adapter);
+ }
+
+ *padap = piix4_adapter;
+
+ return retval;
+}
+
static int __devinit piix4_probe(struct pci_dev *dev,
const struct pci_device_id *id)
{
@@ -532,25 +564,10 @@ static int __devinit piix4_probe(struct pci_dev *dev,
if (retval)
return retval;

- /* set up the sysfs linkage to our parent device */
- piix4_adapter.dev.parent = &dev->dev;
-
- snprintf(piix4_adapter.name, sizeof(piix4_adapter.name),
- "SMBus PIIX4 adapter at %04x", smba);
-
- piix4_adapter_data.smba = smba;
-
- i2c_set_adapdata(&piix4_adapter, &piix4_adapter_data);
-
- if ((retval = i2c_add_adapter(&piix4_adapter))) {
- dev_err(&dev->dev, "Couldn't register adapter!\n");
- release_region(smba, SMBIOSIZE);
- piix4_adapter_data.smba = 0;
- }
-
- return retval;
+ return piix4_add_adapter(dev, smba, &piix4_main_adapter);
}

+/* Remove the adapter and its associated IO region */
static void piix4_adap_remove(struct i2c_adapter *adap)
{
struct i2c_piix4_adapdata *adapdata;
@@ -561,11 +578,17 @@ static void piix4_adap_remove(struct i2c_adapter *adap)
release_region(adapdata->smba, SMBIOSIZE);
adapdata->smba = 0;
}
+
+ kfree(adapdata);
+ kfree(adap);
}

static void __devexit piix4_remove(struct pci_dev *dev)
{
- piix4_adap_remove(&piix4_adapter);
+ if (piix4_main_adapter) {
+ piix4_adap_remove(piix4_main_adapter);
+ piix4_main_adapter = NULL;
+ }
}

static struct pci_driver piix4_driver = {
--
1.7.10


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