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hwmon: (it87) Allow calling __superio_enter outside muxed region

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Allow for superio_enter to be called without requesting the muxed memory
region, in particular for initialisation of the second chipset, which must
be put into configuration mode, but without an associated call to leave
configuration mode.

Signed-off-by: Frank Crawford <frank@crawford.emu.id.au>
Link: https://lore.kernel.org/r/20230104060926.619686-2-frank@crawford.emu.id.au
[groeck: Clarified subject]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Frank Crawford 2023-01-04 17:09:25 +11:00 committed by Guenter Roeck
parent 554df454e2
commit d47e377c7b
1 changed files with 9 additions and 4 deletions
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13
drivers/hwmon/it87.c
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@ -87,6 +87,14 @@ static struct platform_device *it87_pdev[2];
#define DEVID 0x20 /* Register: Device ID */
#define DEVREV 0x22 /* Register: Device Revision */
static inline void __superio_enter(int ioreg)
{
outb(0x87, ioreg);
outb(0x01, ioreg);
outb(0x55, ioreg);
outb(ioreg == REG_4E ? 0xaa : 0x55, ioreg);
}
static inline int superio_inb(int ioreg, int reg)
{
outb(reg, ioreg);
@ -124,10 +132,7 @@ static inline int superio_enter(int ioreg)
if (!request_muxed_region(ioreg, 2, DRVNAME))
return -EBUSY;
outb(0x87, ioreg);
outb(0x01, ioreg);
outb(0x55, ioreg);
outb(ioreg == REG_4E ? 0xaa : 0x55, ioreg);
__superio_enter(ioreg);
return 0;
}