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ACPI / video: Refactor and fix dmi_is_desktop()

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This commit refactors the chassis-type detection introduced by
commit 53fa1f6e8a ("ACPI / video: Only default only_lcd to true on
Win8-ready _desktops_") (where desktop means anything without a builtin
screen).

The DMI chassis_type is an unsigned integer, so rather then doing a
whole bunch of string-compares on it, convert it to an int and feed
the result to a switch case.

Note the switch case uses hex values, this is done because the spec
uses hex values too. This changes the check for "Main Server Chassis"
from checking for 11 decimal to 11 hexadecimal, this is a bug fix,
the original check for 11 decimal was wrong.

Fixes: 53fa1f6e8a ("ACPI / video: Only default only_lcd to true ...")
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
[ rjw: Drop redundant return statements ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Hans de Goede 2019-01-07 17:08:20 +01:00 committed by Rafael J. Wysocki
parent d13937116f
commit cecf3e3e08
1 changed files with 13 additions and 6 deletions
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19
drivers/acpi/acpi_video.c
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@ -2124,21 +2124,28 @@ static int __init intel_opregion_present(void)
return opregion;
}
/* Check if the chassis-type indicates there is no builtin LCD panel */
static bool dmi_is_desktop(void)
{
const char *chassis_type;
unsigned long type;
chassis_type = dmi_get_system_info(DMI_CHASSIS_TYPE);
if (!chassis_type)
return false;
if (!strcmp(chassis_type, "3") || /* 3: Desktop */
!strcmp(chassis_type, "4") || /* 4: Low Profile Desktop */
!strcmp(chassis_type, "5") || /* 5: Pizza Box */
!strcmp(chassis_type, "6") || /* 6: Mini Tower */
!strcmp(chassis_type, "7") || /* 7: Tower */
!strcmp(chassis_type, "11")) /* 11: Main Server Chassis */
if (kstrtoul(chassis_type, 10, &type) != 0)
return false;
switch (type) {
case 0x03: /* Desktop */
case 0x04: /* Low Profile Desktop */
case 0x05: /* Pizza Box */
case 0x06: /* Mini Tower */
case 0x07: /* Tower */
case 0x11: /* Main Server Chassis */
return true;
}
return false;
}