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kernel
os
linux
hwmon: PCI quirk for hwmon access on MSI MS-7031 board
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>
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drivers/hwmon/hwmon.c
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drivers/hwmon/hwmon.c
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#include <linux/hwmon.h>
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#include <linux/gfp.h>
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#include <linux/spinlock.h>
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#include <linux/pci.h>
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#define HWMON_ID_PREFIX "hwmon"
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#define HWMON_ID_FORMAT HWMON_ID_PREFIX "%d"
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"hwmon_device_unregister() failed: bad class ID!\n");
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}
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static void __init hwmon_pci_quirks(void)
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{
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#if defined CONFIG_X86 && defined CONFIG_PCI
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struct pci_dev *sb;
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u16 base;
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u8 enable;
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/* Open access to 0x295-0x296 on MSI MS-7031 */
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sb = pci_get_device(PCI_VENDOR_ID_ATI, 0x436c, NULL);
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if (sb &&
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(sb->subsystem_vendor == 0x1462 && /* MSI */
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sb->subsystem_device == 0x0031)) { /* MS-7031 */
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pci_read_config_byte(sb, 0x48, &enable);
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pci_read_config_word(sb, 0x64, &base);
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if (base == 0 && !(enable & BIT(2))) {
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dev_info(&sb->dev,
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"Opening wide generic port at 0x295\n");
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pci_write_config_word(sb, 0x64, 0x295);
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pci_write_config_byte(sb, 0x48, enable | BIT(2));
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}
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}
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#endif
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}
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static int __init hwmon_init(void)
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{
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hwmon_pci_quirks();
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hwmon_class = class_create(THIS_MODULE, "hwmon");
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if (IS_ERR(hwmon_class)) {
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printk(KERN_ERR "hwmon.c: couldn't create sysfs class\n");