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>
diff --git a/drivers/hwmon/w83627ehf.c b/drivers/hwmon/w83627ehf.c
index 55ac41c..7fbd0ba 100644
--- a/drivers/hwmon/w83627ehf.c
+++ b/drivers/hwmon/w83627ehf.c
@@ -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 @@
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 @@
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,