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authorJean Delvare <khali@linux-fr.org>2012-12-19 22:16:59 +0100
committerJean Delvare <khali@endymion.delvare>2012-12-19 22:16:59 +0100
commit275b7d6ebe9e3599b2d178089171afd63d3fda02 (patch)
tree0bede5b9f1f47cc763952817d57fd3b1495a7624 /drivers/hwmon
parentd6dab7dd123ba6a737e69d89c8cca9c6d9b75aa9 (diff)
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hwmon: (w83627hf) Add support for suspend
On suspend some register values are lost, most notably the Value RAM areas but also other limits. Restore them on resume. On top of that, some fixups are needed to work around BIOS bugs, in particular when the BIOS omits running the same initialization sequence on resume that it does after boot. In that case we have to carry initialization over suspend. Signed-off-by: Jean Delvare <khali@linux-fr.org> Acked-by: Guenter Roeck <linux@roeck-us.net> Tested-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon')
-rw-r--r--drivers/hwmon/w83627hf.c75
1 files changed, 74 insertions, 1 deletions
diff --git a/drivers/hwmon/w83627hf.c b/drivers/hwmon/w83627hf.c
index 7f68b8309d1..9170746e974 100644
--- a/drivers/hwmon/w83627hf.c
+++ b/drivers/hwmon/w83627hf.c
@@ -5,7 +5,7 @@
* Philip Edelbrock <phil@netroedge.com>,
* and Mark Studebaker <mdsxyz123@yahoo.com>
* Ported to 2.6 by Bernhard C. Schrenk <clemy@clemy.org>
- * Copyright (c) 2007 Jean Delvare <khali@linux-fr.org>
+ * Copyright (c) 2007 - 1012 Jean Delvare <khali@linux-fr.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@@ -389,6 +389,12 @@ struct w83627hf_data {
*/
u8 vrm;
u8 vrm_ovt; /* Register value, 627THF/637HF/687THF only */
+
+#ifdef CONFIG_PM
+ /* Remember extra register values over suspend/resume */
+ u8 scfg1;
+ u8 scfg2;
+#endif
};
@@ -401,10 +407,77 @@ static void w83627hf_update_fan_div(struct w83627hf_data *data);
static struct w83627hf_data *w83627hf_update_device(struct device *dev);
static void w83627hf_init_device(struct platform_device *pdev);
+#ifdef CONFIG_PM
+static int w83627hf_suspend(struct device *dev)
+{
+ struct w83627hf_data *data = w83627hf_update_device(dev);
+
+ mutex_lock(&data->update_lock);
+ data->scfg1 = w83627hf_read_value(data, W83781D_REG_SCFG1);
+ data->scfg2 = w83627hf_read_value(data, W83781D_REG_SCFG2);
+ mutex_unlock(&data->update_lock);
+
+ return 0;
+}
+
+static int w83627hf_resume(struct device *dev)
+{
+ struct w83627hf_data *data = dev_get_drvdata(dev);
+ int i, num_temps = (data->type == w83697hf) ? 2 : 3;
+
+ /* Restore limits */
+ mutex_lock(&data->update_lock);
+ for (i = 0; i <= 8; i++) {
+ /* skip missing sensors */
+ if (((data->type == w83697hf) && (i == 1)) ||
+ ((data->type != w83627hf && data->type != w83697hf)
+ && (i == 5 || i == 6)))
+ continue;
+ w83627hf_write_value(data, W83781D_REG_IN_MAX(i),
+ data->in_max[i]);
+ w83627hf_write_value(data, W83781D_REG_IN_MIN(i),
+ data->in_min[i]);
+ }
+ for (i = 0; i <= 2; i++)
+ w83627hf_write_value(data, W83627HF_REG_FAN_MIN(i),
+ data->fan_min[i]);
+ for (i = 0; i < num_temps; i++) {
+ w83627hf_write_value(data, w83627hf_reg_temp_over[i],
+ data->temp_max[i]);
+ w83627hf_write_value(data, w83627hf_reg_temp_hyst[i],
+ data->temp_max_hyst[i]);
+ }
+
+ /* Fixup BIOS bugs */
+ if (data->type == w83627thf || data->type == w83637hf ||
+ data->type == w83687thf)
+ w83627hf_write_value(data, W83627THF_REG_VRM_OVT_CFG,
+ data->vrm_ovt);
+ w83627hf_write_value(data, W83781D_REG_SCFG1, data->scfg1);
+ w83627hf_write_value(data, W83781D_REG_SCFG2, data->scfg2);
+
+ /* Force re-reading all values */
+ data->valid = 0;
+ mutex_unlock(&data->update_lock);
+
+ return 0;
+}
+
+static const struct dev_pm_ops w83627hf_dev_pm_ops = {
+ .suspend = w83627hf_suspend,
+ .resume = w83627hf_resume,
+};
+
+#define W83627HF_DEV_PM_OPS (&w83627hf_dev_pm_ops)
+#else
+#define W83627HF_DEV_PM_OPS NULL
+#endif /* CONFIG_PM */
+
static struct platform_driver w83627hf_driver = {
.driver = {
.owner = THIS_MODULE,
.name = DRVNAME,
+ .pm = W83627HF_DEV_PM_OPS,
},
.probe = w83627hf_probe,
.remove = w83627hf_remove,