diff options
Diffstat (limited to 'drivers/platform/x86')
| -rw-r--r-- | drivers/platform/x86/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/platform/x86/panasonic-laptop.c | 41 |
2 files changed, 42 insertions, 0 deletions
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig index b59063f83104..bc4013e950ed 100644 --- a/drivers/platform/x86/Kconfig +++ b/drivers/platform/x86/Kconfig @@ -946,6 +946,7 @@ config PANASONIC_LAPTOP depends on INPUT && ACPI depends on BACKLIGHT_CLASS_DEVICE depends on ACPI_VIDEO=n || ACPI_VIDEO + depends on SERIO_I8042 || SERIO_I8042 = n select INPUT_SPARSEKMAP help This driver adds support for access to backlight control and hotkeys diff --git a/drivers/platform/x86/panasonic-laptop.c b/drivers/platform/x86/panasonic-laptop.c index d65e6c2372ca..615e39cbbbf1 100644 --- a/drivers/platform/x86/panasonic-laptop.c +++ b/drivers/platform/x86/panasonic-laptop.c @@ -122,6 +122,7 @@ #include <linux/acpi.h> #include <linux/backlight.h> #include <linux/ctype.h> +#include <linux/i8042.h> #include <linux/init.h> #include <linux/input.h> #include <linux/input/sparse-keymap.h> @@ -129,6 +130,7 @@ #include <linux/module.h> #include <linux/platform_device.h> #include <linux/seq_file.h> +#include <linux/serio.h> #include <linux/slab.h> #include <linux/types.h> #include <linux/uaccess.h> @@ -241,6 +243,42 @@ struct pcc_acpi { struct platform_device *platform; }; +/* + * On some Panasonic models the volume up / down / mute keys send duplicate + * keypress events over the PS/2 kbd interface, filter these out. + */ +static bool panasonic_i8042_filter(unsigned char data, unsigned char str, + struct serio *port) +{ + static bool extended; + + if (str & I8042_STR_AUXDATA) + return false; + + if (data == 0xe0) { + extended = true; + return true; + } else if (extended) { + extended = false; + + switch (data & 0x7f) { + case 0x20: /* e0 20 / e0 a0, Volume Mute press / release */ + case 0x2e: /* e0 2e / e0 ae, Volume Down press / release */ + case 0x30: /* e0 30 / e0 b0, Volume Up press / release */ + return true; + default: + /* + * Report the previously filtered e0 before continuing + * with the next non-filtered byte. + */ + serio_interrupt(port, 0xe0, 0); + return false; + } + } + + return false; +} + /* method access functions */ static int acpi_pcc_write_sset(struct pcc_acpi *pcc, int func, int val) { @@ -1006,6 +1044,7 @@ static int acpi_pcc_hotkey_add(struct acpi_device *device) pcc->platform = NULL; } + i8042_install_filter(panasonic_i8042_filter); return 0; out_platform: @@ -1029,6 +1068,8 @@ static int acpi_pcc_hotkey_remove(struct acpi_device *device) if (!device || !pcc) return -EINVAL; + i8042_remove_filter(panasonic_i8042_filter); + if (pcc->platform) { device_remove_file(&pcc->platform->dev, &dev_attr_cdpower); platform_device_unregister(pcc->platform); |