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hwmon: PCI quirk for hwmon access on MSI MS-7031 board

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The MSI MS-7031 is based on an ATI IXP300 south bridge. On this south
bridge, accessible I/O ports must be enabled explicitly. Unfortunately
the BIOS forgets to enable access to the hardware monitoring chip I/O
ports, so hardware monitoring fails.

Add a quirk enabling access to the required ports (0x295-0x296). This
is exactly what MSI's own hardware monitoring application is doing, so
it has to be the right way.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Jean Delvare 2009-06-15 18:39:50 +02:00
parent c1e48dce05
commit 2958b1ec6b
1 changed files with 29 additions and 0 deletions
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29
drivers/hwmon/hwmon.c
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@ -18,6 +18,7 @@
#include <linux/hwmon.h>
#include <linux/gfp.h>
#include <linux/spinlock.h>
#include <linux/pci.h>
#define HWMON_ID_PREFIX "hwmon"
#define HWMON_ID_FORMAT HWMON_ID_PREFIX "%d"
@ -86,8 +87,36 @@ void hwmon_device_unregister(struct device *dev)
"hwmon_device_unregister() failed: bad class ID!\n");
}
static void __init hwmon_pci_quirks(void)
{
#if defined CONFIG_X86 && defined CONFIG_PCI
struct pci_dev *sb;
u16 base;
u8 enable;
/* Open access to 0x295-0x296 on MSI MS-7031 */
sb = pci_get_device(PCI_VENDOR_ID_ATI, 0x436c, NULL);
if (sb &&
(sb->subsystem_vendor == 0x1462 && /* MSI */
sb->subsystem_device == 0x0031)) { /* MS-7031 */
pci_read_config_byte(sb, 0x48, &enable);
pci_read_config_word(sb, 0x64, &base);
if (base == 0 && !(enable & BIT(2))) {
dev_info(&sb->dev,
"Opening wide generic port at 0x295\n");
pci_write_config_word(sb, 0x64, 0x295);
pci_write_config_byte(sb, 0x48, enable | BIT(2));
}
}
#endif
}
static int __init hwmon_init(void)
{
hwmon_pci_quirks();
hwmon_class = class_create(THIS_MODULE, "hwmon");
if (IS_ERR(hwmon_class)) {
printk(KERN_ERR "hwmon.c: couldn't create sysfs class\n");