diff options
| author | Guenter Roeck <linux@roeck-us.net> | 2015-02-07 03:53:21 +0100 |
|---|---|---|
| committer | Guenter Roeck <linux@roeck-us.net> | 2015-03-15 16:54:12 +0100 |
| commit | d2a14ea51a4d7e506b2ebac2c57a32ad577ed693 (patch) | |
| tree | b22d1e2c344cc7b0da549dbed18a504951aaadfc /drivers/hwmon/nct6775.c | |
| parent | hwmon: (nct6775) Convert to use SIMPLE_DEV_PM_OPS (diff) | |
| download | linux-d2a14ea51a4d7e506b2ebac2c57a32ad577ed693.tar.xz linux-d2a14ea51a4d7e506b2ebac2c57a32ad577ed693.zip | |
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/nct6775.c')
| -rw-r--r-- | drivers/hwmon/nct6775.c | 35 |
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++) { |