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authorGuenter Roeck <linux@roeck-us.net>2015-02-06 18:53:21 -0800
committerGuenter Roeck <linux@roeck-us.net>2015-03-15 08:54:12 -0700
commitd2a14ea51a4d7e506b2ebac2c57a32ad577ed693 (patch)
treeb22d1e2c344cc7b0da549dbed18a504951aaadfc /drivers/hwmon
parent48e9318256da995681e6420732055e34f93bddc1 (diff)
hwmon: (nct6775) Restore hardware monitoring logical device status on resume
After a suspend/resume cycle it is not guaranteed that the hardware monitoring device is still enabled. Ensure that this is the case after resume. Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon')
-rw-r--r--drivers/hwmon/nct6775.c35
1 files changed, 22 insertions, 13 deletions
diff --git a/drivers/hwmon/nct6775.c b/drivers/hwmon/nct6775.c
index db6a68efc389..0445a52379e7 100644
--- a/drivers/hwmon/nct6775.c
+++ b/drivers/hwmon/nct6775.c
@@ -885,6 +885,7 @@ struct nct6775_data {
u8 vbat;
u8 fandiv1;
u8 fandiv2;
+ u8 sio_reg_enable;
};
struct nct6775_sio_data {
@@ -3177,6 +3178,10 @@ nct6775_check_fan_inputs(struct nct6775_data *data)
int sioreg = data->sioreg;
int regval;
+ /* Store SIO_REG_ENABLE for use during resume */
+ superio_select(sioreg, NCT6775_LD_HWM);
+ data->sio_reg_enable = superio_inb(sioreg, SIO_REG_ENABLE);
+
/* fan4 and fan5 share some pins with the GPIO and serial flash */
if (data->kind == nct6775) {
regval = superio_inb(sioreg, 0x2c);
@@ -3195,20 +3200,17 @@ nct6775_check_fan_inputs(struct nct6775_data *data)
} else if (data->kind == nct6776) {
bool gpok = superio_inb(sioreg, 0x27) & 0x80;
- superio_select(sioreg, NCT6775_LD_HWM);
- regval = superio_inb(sioreg, SIO_REG_ENABLE);
-
- if (regval & 0x80)
+ if (data->sio_reg_enable & 0x80)
fan3pin = gpok;
else
fan3pin = !(superio_inb(sioreg, 0x24) & 0x40);
- if (regval & 0x40)
+ if (data->sio_reg_enable & 0x40)
fan4pin = gpok;
else
fan4pin = superio_inb(sioreg, 0x1C) & 0x01;
- if (regval & 0x20)
+ if (data->sio_reg_enable & 0x20)
fan5pin = gpok;
else
fan5pin = superio_inb(sioreg, 0x1C) & 0x02;
@@ -4006,19 +4008,26 @@ static int __maybe_unused nct6775_suspend(struct device *dev)
static int __maybe_unused nct6775_resume(struct device *dev)
{
struct nct6775_data *data = dev_get_drvdata(dev);
+ int sioreg = data->sioreg;
int i, j, err = 0;
+ u8 reg;
mutex_lock(&data->update_lock);
data->bank = 0xff; /* Force initial bank selection */
- if (data->kind == nct6791 || data->kind == nct6792) {
- err = superio_enter(data->sioreg);
- if (err)
- goto abort;
+ err = superio_enter(sioreg);
+ if (err)
+ goto abort;
- nct6791_enable_io_mapping(data->sioreg);
- superio_exit(data->sioreg);
- }
+ superio_select(sioreg, NCT6775_LD_HWM);
+ reg = superio_inb(sioreg, SIO_REG_ENABLE);
+ if (reg != data->sio_reg_enable)
+ superio_outb(sioreg, SIO_REG_ENABLE, data->sio_reg_enable);
+
+ if (data->kind == nct6791 || data->kind == nct6792)
+ nct6791_enable_io_mapping(sioreg);
+
+ superio_exit(sioreg);
/* Restore limits */
for (i = 0; i < data->in_num; i++) {