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| author | Hans de Goede <hdegoede@redhat.com> | 2011-05-25 20:43:33 +0200 |
|---|---|---|
| committer | Jean Delvare <khali@endymion.delvare> | 2011-05-25 20:43:33 +0200 |
| commit | 357b9dc6c2dbb01e835415355b70d6b47c43a102 (patch) | |
| tree | f725c3b76bbe530aa409018dd4bec8b34c1f6b32 /drivers/hwmon/sch5627.c | |
| parent | 709046a62293a14fda3986a52818ec01fc11bf75 (diff) | |
| download | linux-357b9dc6c2dbb01e835415355b70d6b47c43a102.tar.gz | |
hwmon: (sch5627) Trigger Vbat measurements
The sch5627 needs to be explicitly told to start an adc conversion for Vbat, once in a while. Without this Vbat may read 0, and will never get updated. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Jean Delvare <khali@linux-fr.org>
Diffstat (limited to 'drivers/hwmon/sch5627.c')
| -rw-r--r-- | drivers/hwmon/sch5627.c | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/drivers/hwmon/sch5627.c b/drivers/hwmon/sch5627.c index d785a2c5431f..020c87273ea1 100644 --- a/drivers/hwmon/sch5627.c +++ b/drivers/hwmon/sch5627.c @@ -97,11 +97,13 @@ static const char * const SCH5627_IN_LABELS[SCH5627_NO_IN] = { struct sch5627_data { unsigned short addr; struct device *hwmon_dev; + u8 control; u8 temp_max[SCH5627_NO_TEMPS]; u8 temp_crit[SCH5627_NO_TEMPS]; u16 fan_min[SCH5627_NO_FANS]; struct mutex update_lock; + unsigned long last_battery; /* In jiffies */ char valid; /* !=0 if following fields are valid */ unsigned long last_updated; /* In jiffies */ u16 temp[SCH5627_NO_TEMPS]; @@ -243,6 +245,12 @@ static int sch5627_read_virtual_reg(struct sch5627_data *data, u16 reg) return sch5627_send_cmd(data, SCH5627_CMD_READ, reg, 0); } +static int sch5627_write_virtual_reg(struct sch5627_data *data, + u16 reg, u8 val) +{ + return sch5627_send_cmd(data, SCH5627_CMD_WRITE, reg, val); +} + static int sch5627_read_virtual_reg16(struct sch5627_data *data, u16 reg) { int lsb, msb; @@ -287,6 +295,13 @@ static struct sch5627_data *sch5627_update_device(struct device *dev) mutex_lock(&data->update_lock); + /* Trigger a Vbat voltage measurement every 5 minutes */ + if (time_after(jiffies, data->last_battery + 300 * HZ)) { + sch5627_write_virtual_reg(data, SCH5627_REG_CTRL, + data->control | 0x10); + data->last_battery = jiffies; + } + /* Cache the values for 1 second */ if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { for (i = 0; i < SCH5627_NO_TEMPS; i++) { @@ -711,11 +726,17 @@ static int __devinit sch5627_probe(struct platform_device *pdev) err = val; goto error; } - if (!(val & 0x01)) { + data->control = val; + if (!(data->control & 0x01)) { pr_err("hardware monitoring not enabled\n"); err = -ENODEV; goto error; } + /* Trigger a Vbat voltage measurement, so that we get a valid reading + the first time we read Vbat */ + sch5627_write_virtual_reg(data, SCH5627_REG_CTRL, + data->control | 0x10); + data->last_battery = jiffies; /* * Read limits, we do this only once as reading a register on |