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hwmon: (nct6775) Add power management support 

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Guenter Roeck 2012-12-04 08:01:39 -08:00
parent 47ece9645f
commit 84d19d92f7
1 changed files with 86 additions and 0 deletions
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86
drivers/hwmon/nct6775.c
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@ -511,6 +511,12 @@ struct nct6775_data {
u16 have_temp;
u16 have_temp_fixed;
u16 have_in;
#ifdef CONFIG_PM
/* Remember extra register values over suspend/resume */
u8 vbat;
u8 fandiv1;
u8 fandiv2;
#endif
};
struct nct6775_sio_data {
@ -2270,10 +2276,90 @@ static int nct6775_remove(struct platform_device *pdev)
return 0;
}
#ifdef CONFIG_PM
static int nct6775_suspend(struct device *dev)
{
struct nct6775_data *data = nct6775_update_device(dev);
struct nct6775_sio_data *sio_data = dev->platform_data;
mutex_lock(&data->update_lock);
data->vbat = nct6775_read_value(data, data->REG_VBAT);
if (sio_data->kind == nct6775) {
data->fandiv1 = nct6775_read_value(data, NCT6775_REG_FANDIV1);
data->fandiv2 = nct6775_read_value(data, NCT6775_REG_FANDIV2);
}
mutex_unlock(&data->update_lock);
return 0;
}
static int nct6775_resume(struct device *dev)
{
struct nct6775_data *data = dev_get_drvdata(dev);
struct nct6775_sio_data *sio_data = dev->platform_data;
int i, j;
mutex_lock(&data->update_lock);
data->bank = 0xff; /* Force initial bank selection */
/* Restore limits */
for (i = 0; i < data->in_num; i++) {
if (!(data->have_in & (1 << i)))
continue;
nct6775_write_value(data, data->REG_IN_MINMAX[0][i],
data->in[i][1]);
nct6775_write_value(data, data->REG_IN_MINMAX[1][i],
data->in[i][2]);
}
for (i = 0; i < 5; i++) {
if (!(data->has_fan_min & (1 << i)))
continue;
nct6775_write_value(data, data->REG_FAN_MIN[i],
data->fan_min[i]);
}
for (i = 0; i < NUM_TEMP; i++) {
if (!(data->have_temp & (1 << i)))
continue;
for (j = 1; j < 4; j++)
if (data->reg_temp[j][i])
nct6775_write_temp(data, data->reg_temp[j][i],
data->temp[j][i]);
}
/* Restore other settings */
nct6775_write_value(data, data->REG_VBAT, data->vbat);
if (sio_data->kind == nct6775) {
nct6775_write_value(data, NCT6775_REG_FANDIV1, data->fandiv1);
nct6775_write_value(data, NCT6775_REG_FANDIV2, data->fandiv2);
}
/* Force re-reading all values */
data->valid = false;
mutex_unlock(&data->update_lock);
return 0;
}
static const struct dev_pm_ops nct6775_dev_pm_ops = {
.suspend = nct6775_suspend,
.resume = nct6775_resume,
};
#define NCT6775_DEV_PM_OPS (&nct6775_dev_pm_ops)
#else
#define NCT6775_DEV_PM_OPS NULL
#endif /* CONFIG_PM */
static struct platform_driver nct6775_driver = {
.driver = {
.owner = THIS_MODULE,
.name = DRVNAME,
.pm = NCT6775_DEV_PM_OPS,
},
.probe = nct6775_probe,
.remove = nct6775_remove,