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w83627ehf: Fix the detection of fan5 

Fix the detection of fan5 and preserve the bit between the
register writes, because the bit is write only.

Signed-off-by: Rudolf Marek <r.marek@assembler.cz>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Rudolf Marek 2006-10-08 22:02:09 +02:00 committed by Greg Kroah-Hartman
parent 4660cb354a
commit 14992c7eff
1 changed files with 9 additions and 2 deletions
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11
drivers/hwmon/w83627ehf.c
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@ -354,6 +354,8 @@ static void w83627ehf_write_fan_div(struct i2c_client *client, int nr)
case 0:
reg = (w83627ehf_read_value(client, W83627EHF_REG_FANDIV1) & 0xcf)
| ((data->fan_div[0] & 0x03) << 4);
/* fan5 input control bit is write only, compute the value */
reg |= (data->has_fan & (1 << 4)) ? 1 : 0;
w83627ehf_write_value(client, W83627EHF_REG_FANDIV1, reg);
reg = (w83627ehf_read_value(client, W83627EHF_REG_VBAT) & 0xdf)
| ((data->fan_div[0] & 0x04) << 3);
@ -362,6 +364,8 @@ static void w83627ehf_write_fan_div(struct i2c_client *client, int nr)
case 1:
reg = (w83627ehf_read_value(client, W83627EHF_REG_FANDIV1) & 0x3f)
| ((data->fan_div[1] & 0x03) << 6);
/* fan5 input control bit is write only, compute the value */
reg |= (data->has_fan & (1 << 4)) ? 1 : 0;
w83627ehf_write_value(client, W83627EHF_REG_FANDIV1, reg);
reg = (w83627ehf_read_value(client, W83627EHF_REG_VBAT) & 0xbf)
| ((data->fan_div[1] & 0x04) << 4);
@ -1216,13 +1220,16 @@ static int w83627ehf_detect(struct i2c_adapter *adapter)
superio_exit();
/* It looks like fan4 and fan5 pins can be alternatively used
as fan on/off switches */
as fan on/off switches, but fan5 control is write only :/
We assume that if the serial interface is disabled, designers
connected fan5 as input unless they are emitting log 1, which
is not the default. */
data->has_fan = 0x07; /* fan1, fan2 and fan3 */
i = w83627ehf_read_value(client, W83627EHF_REG_FANDIV1);
if ((i & (1 << 2)) && (!fan4pin))
data->has_fan |= (1 << 3);
if ((i & (1 << 0)) && (!fan5pin))
if (!(i & (1 << 1)) && (!fan5pin))
data->has_fan |= (1 << 4);
/* Register sysfs hooks */