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hwmon: (w83627ehf) Use request_muxed_region 

Serialize access to the hardware by using "request_muxed_region".
Call to this macro will hold off the requestor if the resource is
currently busy. "superio_enter" will return an error if call to
"request_muxed_region" fails.

Signed-off-by: Katsumi Sato <sato@toshiba-tops.co.jp>
Signed-off-by: Atsushi Nemoto <nemoto@toshiba-tops.co.jp>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Katsumi Sato 2017-02-22 13:32:10 +09:00 committed by Guenter Roeck
parent 3dead5d596
commit 0d0235301b
1 changed files with 24 additions and 11 deletions
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35
drivers/hwmon/w83627ehf.c
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@ -135,11 +135,16 @@ superio_select(int ioreg, int ld)
outb(ld, ioreg + 1);
}
static inline void
static inline int
superio_enter(int ioreg)
{
if (!request_muxed_region(ioreg, 2, DRVNAME))
return -EBUSY;
outb(0x87, ioreg);
outb(0x87, ioreg);
return 0;
}
static inline void
@ -148,6 +153,7 @@ superio_exit(int ioreg)
outb(0xaa, ioreg);
outb(0x02, ioreg);
outb(0x02, ioreg + 1);
release_region(ioreg, 2);
}
/*
@ -1970,8 +1976,6 @@ w83627ehf_check_fan_inputs(const struct w83627ehf_sio_data *sio_data,
return;
}
superio_enter(sio_data->sioreg);
/* fan4 and fan5 share some pins with the GPIO and serial flash */
if (sio_data->kind == nct6775) {
/* On NCT6775, fan4 shares pins with the fdc interface */
@ -2013,8 +2017,6 @@ w83627ehf_check_fan_inputs(const struct w83627ehf_sio_data *sio_data,
fan4min = fan4pin;
}
superio_exit(sio_data->sioreg);
data->has_fan = data->has_fan_min = 0x03; /* fan1 and fan2 */
data->has_fan |= (fan3pin << 2);
data->has_fan_min |= (fan3pin << 2);
@ -2352,7 +2354,11 @@ static int w83627ehf_probe(struct platform_device *pdev)
w83627ehf_init_device(data, sio_data->kind);
data->vrm = vid_which_vrm();
superio_enter(sio_data->sioreg);
err = superio_enter(sio_data->sioreg);
if (err)
goto exit_release;
/* Read VID value */
if (sio_data->kind == w83667hg || sio_data->kind == w83667hg_b ||
sio_data->kind == nct6775 || sio_data->kind == nct6776) {
@ -2364,8 +2370,10 @@ static int w83627ehf_probe(struct platform_device *pdev)
superio_select(sio_data->sioreg, W83667HG_LD_VID);
data->vid = superio_inb(sio_data->sioreg, 0xe3);
err = device_create_file(dev, &dev_attr_cpu0_vid);
if (err)
if (err) {
superio_exit(sio_data->sioreg);
goto exit_release;
}
} else if (sio_data->kind != w83627uhg) {
superio_select(sio_data->sioreg, W83627EHF_LD_HWM);
if (superio_inb(sio_data->sioreg, SIO_REG_VID_CTRL) & 0x80) {
@ -2401,8 +2409,10 @@ static int w83627ehf_probe(struct platform_device *pdev)
data->vid &= 0x3f;
err = device_create_file(dev, &dev_attr_cpu0_vid);
if (err)
if (err) {
superio_exit(sio_data->sioreg);
goto exit_release;
}
} else {
dev_info(dev,
"VID pins in output mode, CPU VID not available\n");
@ -2424,10 +2434,10 @@ static int w83627ehf_probe(struct platform_device *pdev)
pr_info("Enabled fan debounce for chip %s\n", data->name);
}
superio_exit(sio_data->sioreg);
w83627ehf_check_fan_inputs(sio_data, data);
superio_exit(sio_data->sioreg);
/* Read fan clock dividers immediately */
w83627ehf_update_fan_div_common(dev, data);
@ -2712,8 +2722,11 @@ static int __init w83627ehf_find(int sioaddr, unsigned short *addr,
u16 val;
const char *sio_name;
int err;
superio_enter(sioaddr);
err = superio_enter(sioaddr);
if (err)
return err;
if (force_id)
val = force_id;