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authorAndrew Armenia <andrew@asquaredlabs.com>2012-07-24 14:13:56 +0200
committerJean Delvare <khali@endymion.delvare>2012-07-24 14:13:56 +0200
commit14a8086d27ad9761d505489d5a239f21cd67ef0f (patch)
tree350095694b4447e35bf5d8da8c571922301bfde1 /drivers/i2c/busses
parent56f2178898ffca84dcdfb351f0127bf5732b1610 (diff)
downloadlinux-linaro-stable-14a8086d27ad9761d505489d5a239f21cd67ef0f.tar.gz
i2c-piix4: Eliminate piix4_smba global variable
Some chipsets have multiple sets of piix4-compatible SMBus registers. Eliminating the global variable will allow these chipsets to be fully supported. Return value from piix4_setup and piix4_sb800_setup now returns the smba value detected. This is stored in a struct i2c_piix4_adapdata. Thus the global variable is eliminated. Signed-off-by: Andrew Armenia <andrew@asquaredlabs.com> Signed-off-by: Jean Delvare <khali@linux-fr.org>
Diffstat (limited to 'drivers/i2c/busses')
-rw-r--r--drivers/i2c/busses/i2c-piix4.c50
1 files changed, 34 insertions, 16 deletions
diff --git a/drivers/i2c/busses/i2c-piix4.c b/drivers/i2c/busses/i2c-piix4.c
index 46833fa7a3e0..822e868e2ab4 100644
--- a/drivers/i2c/busses/i2c-piix4.c
+++ b/drivers/i2c/busses/i2c-piix4.c
@@ -94,7 +94,6 @@ MODULE_PARM_DESC(force_addr,
"Forcibly enable the PIIX4 at the given address. "
"EXTREMELY DANGEROUS!");
-static unsigned short piix4_smba;
static int srvrworks_csb5_delay;
static struct pci_driver piix4_driver;
static struct i2c_adapter piix4_adapter;
@@ -127,10 +126,15 @@ static struct dmi_system_id __devinitdata piix4_dmi_ibm[] = {
{ },
};
+struct i2c_piix4_adapdata {
+ unsigned short smba;
+};
+
static int __devinit piix4_setup(struct pci_dev *PIIX4_dev,
const struct pci_device_id *id)
{
unsigned char temp;
+ unsigned short piix4_smba;
if ((PIIX4_dev->vendor == PCI_VENDOR_ID_SERVERWORKS) &&
(PIIX4_dev->device == PCI_DEVICE_ID_SERVERWORKS_CSB5))
@@ -206,7 +210,6 @@ static int __devinit piix4_setup(struct pci_dev *PIIX4_dev,
dev_err(&PIIX4_dev->dev,
"Host SMBus controller not enabled!\n");
release_region(piix4_smba, SMBIOSIZE);
- piix4_smba = 0;
return -ENODEV;
}
}
@@ -224,12 +227,13 @@ static int __devinit piix4_setup(struct pci_dev *PIIX4_dev,
"SMBus Host Controller at 0x%x, revision %d\n",
piix4_smba, temp);
- return 0;
+ return piix4_smba;
}
static int __devinit piix4_setup_sb800(struct pci_dev *PIIX4_dev,
const struct pci_device_id *id)
{
+ unsigned short piix4_smba;
unsigned short smba_idx = 0xcd6;
u8 smba_en_lo, smba_en_hi, i2ccfg, i2ccfg_offset = 0x10, smb_en = 0x2c;
@@ -273,7 +277,6 @@ static int __devinit piix4_setup_sb800(struct pci_dev *PIIX4_dev,
dev_err(&PIIX4_dev->dev, "SMBus I2C bus config region "
"0x%x already in use!\n", piix4_smba + i2ccfg_offset);
release_region(piix4_smba, SMBIOSIZE);
- piix4_smba = 0;
return -EBUSY;
}
i2ccfg = inb_p(piix4_smba + i2ccfg_offset);
@@ -288,10 +291,10 @@ static int __devinit piix4_setup_sb800(struct pci_dev *PIIX4_dev,
"SMBus Host Controller at 0x%x, revision %d\n",
piix4_smba, i2ccfg >> 4);
- return 0;
+ return piix4_smba;
}
-static int piix4_transaction(void)
+static int piix4_transaction(unsigned short piix4_smba)
{
int temp;
int result = 0;
@@ -370,6 +373,8 @@ static s32 piix4_access(struct i2c_adapter * adap, u16 addr,
unsigned short flags, char read_write,
u8 command, int size, union i2c_smbus_data * data)
{
+ struct i2c_piix4_adapdata *adapdata = i2c_get_adapdata(adap);
+ unsigned short piix4_smba = adapdata->smba;
int i, len;
int status;
@@ -426,7 +431,7 @@ static s32 piix4_access(struct i2c_adapter * adap, u16 addr,
outb_p((size & 0x1C) + (ENABLE_INT9 & 1), SMBHSTCNT);
- status = piix4_transaction();
+ status = piix4_transaction(piix4_smba);
if (status)
return status;
@@ -472,6 +477,8 @@ static struct i2c_adapter piix4_adapter = {
.algo = &smbus_algorithm,
};
+static struct i2c_piix4_adapdata piix4_adapter_data;
+
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) },
@@ -510,33 +517,44 @@ static int __devinit piix4_probe(struct pci_dev *dev,
else
retval = piix4_setup(dev, id);
- if (retval)
+ if (retval < 0)
return retval;
+ piix4_adapter_data.smba = 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", piix4_smba);
+ "SMBus PIIX4 adapter at %04x", piix4_adapter_data.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(piix4_smba, SMBIOSIZE);
- piix4_smba = 0;
+ release_region(piix4_adapter_data.smba, SMBIOSIZE);
+ piix4_adapter_data.smba = 0;
}
return retval;
}
-static void __devexit piix4_remove(struct pci_dev *dev)
+static void __devexit piix4_adap_remove(struct i2c_adapter *adap)
{
- if (piix4_smba) {
- i2c_del_adapter(&piix4_adapter);
- release_region(piix4_smba, SMBIOSIZE);
- piix4_smba = 0;
+ struct i2c_piix4_adapdata *adapdata = i2c_get_adapdata(adap);
+
+ if (adapdata->smba) {
+ i2c_del_adapter(adap);
+ release_region(adapdata->smba, SMBIOSIZE);
+ adapdata->smba = 0;
}
}
+static void __devexit piix4_remove(struct pci_dev *dev)
+{
+ piix4_adap_remove(&piix4_adapter);
+}
+
static struct pci_driver piix4_driver = {
.name = "piix4_smbus",
.id_table = piix4_ids,