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| author | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2011-07-27 00:54:47 -0700 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2011-07-27 00:54:47 -0700 |
| commit | aa7eb8e78d8ecd6cd0475d86ea8385ff9cb47ece (patch) | |
| tree | 3f9e98fadd5124fb05e8f6f9b06aa23698d4f215 /drivers/hwmon/it87.c | |
| parent | cca8edfd2ec2a34d9f50f593bc753bb11e1bc1f5 (diff) | |
| parent | 3c6b50141ef9f0a8844bf1357b80c0cdf518bf05 (diff) | |
Merge branch 'next' into for-linus
Diffstat (limited to 'drivers/hwmon/it87.c')
| -rw-r--r-- | drivers/hwmon/it87.c | 31 |
1 files changed, 19 insertions, 12 deletions
diff --git a/drivers/hwmon/it87.c b/drivers/hwmon/it87.c index 316b64823f7..bb6405b9200 100644 --- a/drivers/hwmon/it87.c +++ b/drivers/hwmon/it87.c @@ -77,15 +77,13 @@ static struct platform_device *pdev; #define DEVID 0x20 /* Register: Device ID */ #define DEVREV 0x22 /* Register: Device Revision */ -static inline int -superio_inb(int reg) +static inline int superio_inb(int reg) { outb(reg, REG); return inb(VAL); } -static inline void -superio_outb(int reg, int val) +static inline void superio_outb(int reg, int val) { outb(reg, REG); outb(val, VAL); @@ -101,27 +99,32 @@ static int superio_inw(int reg) return val; } -static inline void -superio_select(int ldn) +static inline void superio_select(int ldn) { outb(DEV, REG); outb(ldn, VAL); } -static inline void -superio_enter(void) +static inline int superio_enter(void) { + /* + * Try to reserve REG and REG + 1 for exclusive access. + */ + if (!request_muxed_region(REG, 2, DRVNAME)) + return -EBUSY; + outb(0x87, REG); outb(0x01, REG); outb(0x55, REG); outb(0x55, REG); + return 0; } -static inline void -superio_exit(void) +static inline void superio_exit(void) { outb(0x02, REG); outb(0x02, VAL); + release_region(REG, 2); } /* Logical device 4 registers */ @@ -1542,11 +1545,15 @@ static const struct attribute_group it87_group_label = { static int __init it87_find(unsigned short *address, struct it87_sio_data *sio_data) { - int err = -ENODEV; + int err; u16 chip_type; const char *board_vendor, *board_name; - superio_enter(); + err = superio_enter(); + if (err) + return err; + + err = -ENODEV; chip_type = force_id ? force_id : superio_inw(DEVID); switch (chip_type) { |