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ACPI: ibm-acpi: clean up fan_read

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This patch cleans up fan_read so that it is much easier to read and
extend.

The patch fixes the userspace ABI to return "status: not supported" (like
all other ibm-acpi functions) when neither fan status or fan control are
possible.

It also fixes the userspace ABI to return EIO if ACPI access to the EC
fails, instead of returning "status: unreadable" or "speed: unreadable".

Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
This commit is contained in:
Henrique de Moraes Holschuh 2006-11-24 11:47:10 -02:00 committed by Len Brown
parent 69ba91cbd6
commit 3ef8a6096c
1 changed files with 24 additions and 16 deletions
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40
drivers/acpi/ibm_acpi.c
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@ -1741,40 +1741,48 @@ static int fan_init(void)
static int fan_read(char *p)
{
int len = 0;
int s;
u8 lo, hi, status;
if (gfan_handle) {
switch (fan_status_access_mode) {
case IBMACPI_FAN_RD_ACPI_GFAN:
/* 570, 600e/x, 770e, 770x */
if (!acpi_evalf(gfan_handle, &s, NULL, "d"))
if (unlikely(!acpi_evalf(gfan_handle, &status, NULL, "d")))
return -EIO;
len += sprintf(p + len, "level:\t\t%d\n", s);
} else {
len += sprintf(p + len, "level:\t\t%d\n", status);
break;
case IBMACPI_FAN_RD_TPEC:
/* all except 570, 600e/x, 770e, 770x */
if (!acpi_ec_read(fan_status_offset, &status))
len += sprintf(p + len, "status:\t\tunreadable\n");
if (unlikely(!acpi_ec_read(fan_status_offset, &status)))
return -EIO;
else
len += sprintf(p + len, "status:\t\t%s\n",
enabled(status, 7));
if (!acpi_ec_read(fan_rpm_offset, &lo) ||
!acpi_ec_read(fan_rpm_offset + 1, &hi))
len += sprintf(p + len, "speed:\t\tunreadable\n");
if (unlikely(!acpi_ec_read(fan_rpm_offset, &lo) ||
!acpi_ec_read(fan_rpm_offset + 1, &hi)))
return -EIO;
else
len += sprintf(p + len, "speed:\t\t%d\n",
(hi << 8) + lo);
break;
case IBMACPI_FAN_NONE:
default:
len += sprintf(p + len, "status:\t\tnot supported\n");
}
if (sfan_handle)
/* 570, 770x-JL */
if (fan_control_commands & IBMACPI_FAN_CMD_LEVEL)
len += sprintf(p + len, "commands:\tlevel <level>"
" (<level> is 0-7)\n");
if (!gfan_handle)
/* all except 570, 600e/x, 770e, 770x */
if (fan_control_commands & IBMACPI_FAN_CMD_ENABLE)
len += sprintf(p + len, "commands:\tenable, disable\n");
if (fans_handle)
/* X31, X40 */
if (fan_control_commands & IBMACPI_FAN_CMD_SPEED)
len += sprintf(p + len, "commands:\tspeed <speed>"
" (<speed> is 0-65535)\n");