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hwmon: (w83627ehf) Add support for suspend 

On suspend some register values are lost, most notably the Value RAM
areas but also other limits and settings. Restore them on resume.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Jean Delvare 2012-12-19 22:16:59 +01:00 committed by Jean Delvare
parent 275b7d6ebe
commit 7e630bb55a
1 changed files with 94 additions and 1 deletions
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95
drivers/hwmon/w83627ehf.c
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@ -1,7 +1,7 @@
/*
* w83627ehf - Driver for the hardware monitoring functionality of
* the Winbond W83627EHF Super-I/O chip
* Copyright (C) 2005-2011 Jean Delvare <khali@linux-fr.org>
* Copyright (C) 2005-2012 Jean Delvare <khali@linux-fr.org>
* Copyright (C) 2006 Yuan Mu (Winbond),
* Rudolf Marek <r.marek@assembler.cz>
* David Hubbard <david.c.hubbard@gmail.com>
@ -502,6 +502,13 @@ struct w83627ehf_data {
u16 have_temp_offset;
u8 in6_skip:1;
u8 temp3_val_only:1;
#ifdef CONFIG_PM
/* Remember extra register values over suspend/resume */
u8 vbat;
u8 fandiv1;
u8 fandiv2;
#endif
};
struct w83627ehf_sio_data {
@ -2608,10 +2615,96 @@ static int w83627ehf_remove(struct platform_device *pdev)
return 0;
}
#ifdef CONFIG_PM
static int w83627ehf_suspend(struct device *dev)
{
struct w83627ehf_data *data = w83627ehf_update_device(dev);
struct w83627ehf_sio_data *sio_data = dev->platform_data;
mutex_lock(&data->update_lock);
data->vbat = w83627ehf_read_value(data, W83627EHF_REG_VBAT);
if (sio_data->kind == nct6775) {
data->fandiv1 = w83627ehf_read_value(data, NCT6775_REG_FANDIV1);
data->fandiv2 = w83627ehf_read_value(data, NCT6775_REG_FANDIV2);
}
mutex_unlock(&data->update_lock);
return 0;
}
static int w83627ehf_resume(struct device *dev)
{
struct w83627ehf_data *data = dev_get_drvdata(dev);
struct w83627ehf_sio_data *sio_data = dev->platform_data;
int i;
mutex_lock(&data->update_lock);
data->bank = 0xff; /* Force initial bank selection */
/* Restore limits */
for (i = 0; i < data->in_num; i++) {
if ((i == 6) && data->in6_skip)
continue;
w83627ehf_write_value(data, W83627EHF_REG_IN_MIN(i),
data->in_min[i]);
w83627ehf_write_value(data, W83627EHF_REG_IN_MAX(i),
data->in_max[i]);
}
for (i = 0; i < 5; i++) {
if (!(data->has_fan_min & (1 << i)))
continue;
w83627ehf_write_value(data, data->REG_FAN_MIN[i],
data->fan_min[i]);
}
for (i = 0; i < NUM_REG_TEMP; i++) {
if (!(data->have_temp & (1 << i)))
continue;
if (data->reg_temp_over[i])
w83627ehf_write_temp(data, data->reg_temp_over[i],
data->temp_max[i]);
if (data->reg_temp_hyst[i])
w83627ehf_write_temp(data, data->reg_temp_hyst[i],
data->temp_max_hyst[i]);
if (data->have_temp_offset & (1 << i))
w83627ehf_write_value(data,
W83627EHF_REG_TEMP_OFFSET[i],
data->temp_offset[i]);
}
/* Restore other settings */
w83627ehf_write_value(data, W83627EHF_REG_VBAT, data->vbat);
if (sio_data->kind == nct6775) {
w83627ehf_write_value(data, NCT6775_REG_FANDIV1, data->fandiv1);
w83627ehf_write_value(data, NCT6775_REG_FANDIV2, data->fandiv2);
}
/* Force re-reading all values */
data->valid = 0;
mutex_unlock(&data->update_lock);
return 0;
}
static const struct dev_pm_ops w83627ehf_dev_pm_ops = {
.suspend = w83627ehf_suspend,
.resume = w83627ehf_resume,
};
#define W83627EHF_DEV_PM_OPS (&w83627ehf_dev_pm_ops)
#else
#define W83627EHF_DEV_PM_OPS NULL
#endif /* CONFIG_PM */
static struct platform_driver w83627ehf_driver = {
.driver = {
.owner = THIS_MODULE,
.name = DRVNAME,
.pm = W83627EHF_DEV_PM_OPS,
},
.probe = w83627ehf_probe,
.remove = w83627ehf_remove,