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