[PATCH 06/11] platform/x86: fujitsu-laptop: clean up use_alt_lcd_levels handling

Michał Kępień
2017-03-30T10:36:05Z

The value of each module parameter can be changed on the fly via sysfs.
However, the current way of handling use_alt_lcd_levels prevents the
user from dynamically switching from a value of 0 or 1 back to
autodetection as the latter is only performed upon ACPI device
instantiation. Fix this by moving autodetection (in a simplified form)
to set_lcd_level() and changing module parameter type to int. Do not
announce autodetection results in a debug message as current value of
use_alt_lcd_levels can simply be read from sysfs. Clarify module
parameter description.

Signed-off-by: Michał Kępień <kernel@kempniu.pl>
---
drivers/platform/x86/fujitsu-laptop.c | 26 ++++++++++----------------
1 file changed, 10 insertions(+), 16 deletions(-)

diff --git a/drivers/platform/x86/fujitsu-laptop.c b/drivers/platform/x86/fujitsu-laptop.c
index 9981988f82d2..d10fbb0ed95b 100644
--- a/drivers/platform/x86/fujitsu-laptop.c
+++ b/drivers/platform/x86/fujitsu-laptop.c
@@ -362,6 +362,12 @@ static int set_lcd_level(int level)
char *method;

switch (use_alt_lcd_levels) {
+ case -1:
+ if (acpi_has_method(fujitsu_bl->acpi_handle, "SBL2"))
+ method = "SBL2";
+ else
+ method = "SBLL";
+ break;
case 1:
method = "SBL2";
break;
@@ -605,21 +611,10 @@ static int acpi_fujitsu_bl_add(struct acpi_device *device)
pr_err("_INI Method failed\n");
}

- if (use_alt_lcd_levels == -1) {
- if (acpi_has_method(NULL, "\\_SB.PCI0.LPCB.FJEX.SBL2"))
- use_alt_lcd_levels = 1;
- else
- use_alt_lcd_levels = 0;
- vdbg_printk(FUJLAPTOP_DBG_TRACE, "auto-detected usealt as %i\n",
- use_alt_lcd_levels);
- }
-
/* do config (detect defaults) */
- use_alt_lcd_levels = use_alt_lcd_levels == 1 ? 1 : 0;
disable_brightness_adjust = disable_brightness_adjust == 1 ? 1 : 0;
- vdbg_printk(FUJLAPTOP_DBG_INFO,
- "config: [alt interface: %d], [adjust disable: %d]\n",
- use_alt_lcd_levels, disable_brightness_adjust);
+ vdbg_printk(FUJLAPTOP_DBG_INFO, "config: [adjust disable: %d]\n",
+ disable_brightness_adjust);

if (get_max_brightness() <= 0)
fujitsu_bl->max_brightness = FUJITSU_LCD_N_LEVELS;
@@ -1152,9 +1147,8 @@ static void __exit fujitsu_cleanup(void)
module_init(fujitsu_init);
module_exit(fujitsu_cleanup);

-module_param(use_alt_lcd_levels, uint, 0644);
-MODULE_PARM_DESC(use_alt_lcd_levels,
- "Use alternative interface for lcd_levels (needed for Lifebook s6410).");
+module_param(use_alt_lcd_levels, int, 0644);
+MODULE_PARM_DESC(use_alt_lcd_levels, "Interface used for setting LCD brightness level (-1 = auto, 0 = force SBLL, 1 = force SBL2)");
module_param(disable_brightness_adjust, uint, 0644);
MODULE_PARM_DESC(disable_brightness_adjust, "Disable brightness adjustment .");
#ifdef CONFIG_FUJITSU_LAPTOP_DEBUG
--
2.12.1