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@xxxxxxxxxxxx> --- Changes since v1: * Force initial bank selection at resume. Thanks Guenter :) I also updated the driver at: http://khali.linux-fr.org/devel/misc/w83627ehf/ drivers/hwmon/w83627ehf.c | 95 ++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 94 insertions(+), 1 deletion(-) --- linux-3.7-rc2.orig/drivers/hwmon/w83627ehf.c 2012-10-26 09:34:04.028295469 +0200 +++ linux-3.7-rc2/drivers/hwmon/w83627ehf.c 2012-10-26 09:40:28.102773093 +0200 @@ -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@xxxxxxxxxxxx> + * Copyright (C) 2005-2012 Jean Delvare <khali@xxxxxxxxxxxx> * Copyright (C) 2006 Yuan Mu (Winbond), * Rudolf Marek <r.marek@xxxxxxxxxxxx> * David Hubbard <david.c.hubbard@xxxxxxxxx> @@ -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 __devexit w83627ehf_remove(st 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 = __devexit_p(w83627ehf_remove), -- Jean Delvare _______________________________________________ lm-sensors mailing list lm-sensors@xxxxxxxxxxxxxx http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
