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Commit 7e630bb5 authored by Jean Delvare's avatar Jean Delvare Committed by Jean Delvare
Browse files

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: default avatarJean Delvare <khali@linux-fr.org>
Reviewed-by: default avatarGuenter Roeck <linux@roeck-us.net>
Tested-by: default avatarGuenter Roeck <linux@roeck-us.net>
parent 275b7d6e

drivers/hwmon/w83627ehf.c

+94 −1
Original line number Diff line number Diff line 
/*

 *  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,