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Message-Id: <1424343509-13639-1-git-send-email-gabriele.mzt@gmail.com>
Date: Thu, 19 Feb 2015 11:58:29 +0100
From: Gabriele Mazzotta <gabriele.mzt@...il.com>
To: mjg59@...f.ucam.org, dvhart@...radead.org
Cc: pali.rohar@...il.com, linux-kernel@...r.kernel.org,
platform-driver-x86@...r.kernel.org, A.Sloman@...bham.ac.uk,
computersforpeace@...il.com, dan.carpenter@...cle.com,
Gabriele Mazzotta <gabriele.mzt@...il.com>
Subject: [PATCH] platform: x86: dell-laptop: Add support for keyboard backlight
This patch adds the support for the configuration of the keyboard
backlight on supported Dell laptops.
With this patch it is possible to set:
* keyboard backlight level
* timeout after which the backlight will be automatically turned off
* input activity triggers (keyboard, touchpad, mouse) that enable the backlight
* ambient light settings
The settings are exposed via /sys/class/leds/dell::kbd_backlight/
The code is based on the newly released documentation by Dell in the
libsmbios project.
Signed-off-by: Pali Rohár <pali.rohar@...il.com>
Signed-off-by: Gabriele Mazzotta <gabriele.mzt@...il.com>
Cc: Dan Carpenter <dan.carpenter@...cle.com>
---
.../ABI/testing/sysfs-platform-dell-laptop | 69 ++
drivers/platform/x86/dell-laptop.c | 1089 +++++++++++++++++++-
2 files changed, 1152 insertions(+), 6 deletions(-)
create mode 100644 Documentation/ABI/testing/sysfs-platform-dell-laptop
diff --git a/Documentation/ABI/testing/sysfs-platform-dell-laptop b/Documentation/ABI/testing/sysfs-platform-dell-laptop
new file mode 100644
index 0000000..8c6a0b8
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-platform-dell-laptop
@@ -0,0 +1,69 @@
+What: /sys/class/leds/dell::kbd_backlight/als_enabled
+Date: December 2014
+KernelVersion: 3.19
+Contact: Gabriele Mazzotta <gabriele.mzt@...il.com>,
+ Pali Rohár <pali.rohar@...il.com>
+Description:
+ This file allows to control the automatic keyboard
+ illumination mode on some systems that have an ambient
+ light sensor. Write 1 to this file to enable the auto
+ mode, 0 to disable it.
+
+What: /sys/class/leds/dell::kbd_backlight/als_setting
+Date: December 2014
+KernelVersion: 3.19
+Contact: Gabriele Mazzotta <gabriele.mzt@...il.com>,
+ Pali Rohár <pali.rohar@...il.com>
+Description:
+ This file allows to specifiy the on/off threshold value,
+ as reported by the ambient light sensor.
+
+What: /sys/class/leds/dell::kbd_backlight/start_triggers
+Date: December 2014
+KernelVersion: 3.19
+Contact: Gabriele Mazzotta <gabriele.mzt@...il.com>,
+ Pali Rohár <pali.rohar@...il.com>
+Description:
+ This file allows to control the input triggers that
+ turn on the keyboard backlight illumination that is
+ disabled because of inactivity.
+ Read the file to see the triggers available. The ones
+ enabled are preceded by '+', those disabled by '-'.
+
+ To enable a trigger, write its name preceded by '+' to
+ this file. To disable a trigger, write its name preceded
+ by '-' instead.
+
+ For example, to enable the keyboard as trigger run:
+ echo +keyboard > /sys/class/leds/dell::kbd_backlight/start_triggers
+ To disable it:
+ echo -keyboard > /sys/class/leds/dell::kbd_backlight/start_triggers
+
+ Note that not all the available triggers can be configured.
+
+What: /sys/class/leds/dell::kbd_backlight/stop_timeout
+Date: December 2014
+KernelVersion: 3.19
+Contact: Gabriele Mazzotta <gabriele.mzt@...il.com>,
+ Pali Rohár <pali.rohar@...il.com>
+Description:
+ This file allows to specify the interval after which the
+ keyboard illumination is disabled because of inactivity.
+ The timeouts are expressed in seconds, minutes, hours and
+ days, for which the symbols are 's', 'm', 'h' and 'd'
+ respectively.
+
+ To configure the timeout, write to this file a value along
+ with any the above units. If no unit is specified, the value
+ is assumed to be expressed in seconds.
+
+ For example, to set the timeout to 10 minutes run:
+ echo 10m > /sys/class/leds/dell::kbd_backlight/stop_timeout
+
+ Note that when this file is read, the returned value might be
+ expressed in a different unit than the one used when the timeout
+ was set.
+
+ Also note that only some timeouts are supported and that
+ some systems might fall back to a specific timeout in case
+ an invalid timeout is written to this file.
diff --git a/drivers/platform/x86/dell-laptop.c b/drivers/platform/x86/dell-laptop.c
index 3d21efe..d688d80 100644
--- a/drivers/platform/x86/dell-laptop.c
+++ b/drivers/platform/x86/dell-laptop.c
@@ -2,9 +2,11 @@
* Driver for Dell laptop extras
*
* Copyright (c) Red Hat <mjg@...hat.com>
+ * Copyright (c) 2014 Gabriele Mazzotta <gabriele.mzt@...il.com>
+ * Copyright (c) 2014 Pali Rohár <pali.rohar@...il.com>
*
- * Based on documentation in the libsmbios package, Copyright (C) 2005 Dell
- * Inc.
+ * Based on documentation in the libsmbios package:
+ * Copyright (C) 2005-2014 Dell Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@@ -32,6 +34,13 @@
#include "../../firmware/dcdbas.h"
#define BRIGHTNESS_TOKEN 0x7d
+#define KBD_LED_OFF_TOKEN 0x01E1
+#define KBD_LED_ON_TOKEN 0x01E2
+#define KBD_LED_AUTO_TOKEN 0x01E3
+#define KBD_LED_AUTO_25_TOKEN 0x02EA
+#define KBD_LED_AUTO_50_TOKEN 0x02EB
+#define KBD_LED_AUTO_75_TOKEN 0x02EC
+#define KBD_LED_AUTO_100_TOKEN 0x02F6
/* This structure will be modified by the firmware when we enter
* system management mode, hence the volatiles */
@@ -62,6 +71,13 @@ struct calling_interface_structure {
struct quirk_entry {
u8 touchpad_led;
+
+ int needs_kbd_timeouts;
+ /*
+ * Ordered list of timeouts expressed in seconds.
+ * The list must end with -1
+ */
+ int kbd_timeouts[];
};
static struct quirk_entry *quirks;
@@ -76,6 +92,15 @@ static int __init dmi_matched(const struct dmi_system_id *dmi)
return 1;
}
+/*
+ * These values come from Windows utility provided by Dell. If any other value
+ * is used then BIOS silently set timeout to 0 without any error message.
+ */
+static struct quirk_entry quirk_dell_xps13_9333 = {
+ .needs_kbd_timeouts = 1,
+ .kbd_timeouts = { 0, 5, 15, 60, 5 * 60, 15 * 60, -1 },
+};
+
static int da_command_address;
static int da_command_code;
static int da_num_tokens;
@@ -267,6 +292,15 @@ static const struct dmi_system_id dell_quirks[] __initconst = {
},
.driver_data = &quirk_dell_vostro_v130,
},
+ {
+ .callback = dmi_matched,
+ .ident = "Dell XPS13 9333",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "XPS13 9333"),
+ },
+ .driver_data = &quirk_dell_xps13_9333,
+ },
{ }
};
@@ -331,17 +365,29 @@ static void __init find_tokens(const struct dmi_header *dm, void *dummy)
}
}
-static int find_token_location(int tokenid)
+static int find_token_id(int tokenid)
{
int i;
+
for (i = 0; i < da_num_tokens; i++) {
if (da_tokens[i].tokenID == tokenid)
- return da_tokens[i].location;
+ return i;
}
return -1;
}
+static int find_token_location(int tokenid)
+{
+ int id;
+
+ id = find_token_id(tokenid);
+ if (id == -1)
+ return -1;
+
+ return da_tokens[id].location;
+}
+
static struct calling_interface_buffer *
dell_send_request(struct calling_interface_buffer *buffer, int class,
int select)
@@ -362,6 +408,20 @@ dell_send_request(struct calling_interface_buffer *buffer, int class,
return buffer;
}
+static inline int dell_smi_error(int value)
+{
+ switch (value) {
+ case 0: /* Completed successfully */
+ return 0;
+ case -1: /* Completed with error */
+ return -EIO;
+ case -2: /* Function not supported */
+ return -ENXIO;
+ default: /* Unknown error */
+ return -EINVAL;
+ }
+}
+
/* Derived from information in DellWirelessCtl.cpp:
Class 17, select 11 is radio control. It returns an array of 32-bit values.
@@ -716,7 +776,7 @@ static int dell_send_intensity(struct backlight_device *bd)
else
dell_send_request(buffer, 1, 1);
-out:
+ out:
release_buffer();
return ret;
}
@@ -740,7 +800,7 @@ static int dell_get_intensity(struct backlight_device *bd)
ret = buffer->output[1];
-out:
+ out:
release_buffer();
return ret;
}
@@ -789,6 +849,1018 @@ static void touchpad_led_exit(void)
led_classdev_unregister(&touchpad_led);
}
+/*
+ * Derived from information in smbios-keyboard-ctl:
+ *
+ * cbClass 4
+ * cbSelect 11
+ * Keyboard illumination
+ * cbArg1 determines the function to be performed
+ *
+ * cbArg1 0x0 = Get Feature Information
+ * cbRES1 Standard return codes (0, -1, -2)
+ * cbRES2, word0 Bitmap of user-selectable modes
+ * bit 0 Always off (All systems)
+ * bit 1 Always on (Travis ATG, Siberia)
+ * bit 2 Auto: ALS-based On; ALS-based Off (Travis ATG)
+ * bit 3 Auto: ALS- and input-activity-based On; input-activity based Off
+ * bit 4 Auto: Input-activity-based On; input-activity based Off
+ * bit 5 Auto: Input-activity-based On (illumination level 25%); input-activity based Off
+ * bit 6 Auto: Input-activity-based On (illumination level 50%); input-activity based Off
+ * bit 7 Auto: Input-activity-based On (illumination level 75%); input-activity based Off
+ * bit 8 Auto: Input-activity-based On (illumination level 100%); input-activity based Off
+ * bits 9-15 Reserved for future use
+ * cbRES2, byte2 Reserved for future use
+ * cbRES2, byte3 Keyboard illumination type
+ * 0 Reserved
+ * 1 Tasklight
+ * 2 Backlight
+ * 3-255 Reserved for future use
+ * cbRES3, byte0 Supported auto keyboard illumination trigger bitmap.
+ * bit 0 Any keystroke
+ * bit 1 Touchpad activity
+ * bit 2 Pointing stick
+ * bit 3 Any mouse
+ * bits 4-7 Reserved for future use
+ * cbRES3, byte1 Supported timeout unit bitmap
+ * bit 0 Seconds
+ * bit 1 Minutes
+ * bit 2 Hours
+ * bit 3 Days
+ * bits 4-7 Reserved for future use
+ * cbRES3, byte2 Number of keyboard light brightness levels
+ * cbRES4, byte0 Maximum acceptable seconds value (0 if seconds not supported).
+ * cbRES4, byte1 Maximum acceptable minutes value (0 if minutes not supported).
+ * cbRES4, byte2 Maximum acceptable hours value (0 if hours not supported).
+ * cbRES4, byte3 Maximum acceptable days value (0 if days not supported)
+ *
+ * cbArg1 0x1 = Get Current State
+ * cbRES1 Standard return codes (0, -1, -2)
+ * cbRES2, word0 Bitmap of current mode state
+ * bit 0 Always off (All systems)
+ * bit 1 Always on (Travis ATG, Siberia)
+ * bit 2 Auto: ALS-based On; ALS-based Off (Travis ATG)
+ * bit 3 Auto: ALS- and input-activity-based On; input-activity based Off
+ * bit 4 Auto: Input-activity-based On; input-activity based Off
+ * bit 5 Auto: Input-activity-based On (illumination level 25%); input-activity based Off
+ * bit 6 Auto: Input-activity-based On (illumination level 50%); input-activity based Off
+ * bit 7 Auto: Input-activity-based On (illumination level 75%); input-activity based Off
+ * bit 8 Auto: Input-activity-based On (illumination level 100%); input-activity based Off
+ * bits 9-15 Reserved for future use
+ * Note: Only One bit can be set
+ * cbRES2, byte2 Currently active auto keyboard illumination triggers.
+ * bit 0 Any keystroke
+ * bit 1 Touchpad activity
+ * bit 2 Pointing stick
+ * bit 3 Any mouse
+ * bits 4-7 Reserved for future use
+ * cbRES2, byte3 Current Timeout
+ * bits 7:6 Timeout units indicator:
+ * 00b Seconds
+ * 01b Minutes
+ * 10b Hours
+ * 11b Days
+ * bits 5:0 Timeout value (0-63) in sec/min/hr/day
+ * NOTE: A value of 0 means always on (no timeout) if any bits of RES3 byte
+ * are set upon return from the [Get feature information] call.
+ * cbRES3, byte0 Current setting of ALS value that turns the light on or off.
+ * cbRES3, byte1 Current ALS reading
+ * cbRES3, byte2 Current keyboard light level.
+ *
+ * cbArg1 0x2 = Set New State
+ * cbRES1 Standard return codes (0, -1, -2)
+ * cbArg2, word0 Bitmap of current mode state
+ * bit 0 Always off (All systems)
+ * bit 1 Always on (Travis ATG, Siberia)
+ * bit 2 Auto: ALS-based On; ALS-based Off (Travis ATG)
+ * bit 3 Auto: ALS- and input-activity-based On; input-activity based Off
+ * bit 4 Auto: Input-activity-based On; input-activity based Off
+ * bit 5 Auto: Input-activity-based On (illumination level 25%); input-activity based Off
+ * bit 6 Auto: Input-activity-based On (illumination level 50%); input-activity based Off
+ * bit 7 Auto: Input-activity-based On (illumination level 75%); input-activity based Off
+ * bit 8 Auto: Input-activity-based On (illumination level 100%); input-activity based Off
+ * bits 9-15 Reserved for future use
+ * Note: Only One bit can be set
+ * cbArg2, byte2 Desired auto keyboard illumination triggers. Must remain inactive to allow
+ * keyboard to turn off automatically.
+ * bit 0 Any keystroke
+ * bit 1 Touchpad activity
+ * bit 2 Pointing stick
+ * bit 3 Any mouse
+ * bits 4-7 Reserved for future use
+ * cbArg2, byte3 Desired Timeout
+ * bits 7:6 Timeout units indicator:
+ * 00b Seconds
+ * 01b Minutes
+ * 10b Hours
+ * 11b Days
+ * bits 5:0 Timeout value (0-63) in sec/min/hr/day
+ * cbArg3, byte0 Desired setting of ALS value that turns the light on or off.
+ * cbArg3, byte2 Desired keyboard light level.
+ */
+
+
+enum kbd_timeout_unit {
+ KBD_TIMEOUT_SECONDS = 0,
+ KBD_TIMEOUT_MINUTES,
+ KBD_TIMEOUT_HOURS,
+ KBD_TIMEOUT_DAYS,
+};
+
+enum kbd_mode_bit {
+ KBD_MODE_BIT_OFF = 0,
+ KBD_MODE_BIT_ON,
+ KBD_MODE_BIT_ALS,
+ KBD_MODE_BIT_TRIGGER_ALS,
+ KBD_MODE_BIT_TRIGGER,
+ KBD_MODE_BIT_TRIGGER_25,
+ KBD_MODE_BIT_TRIGGER_50,
+ KBD_MODE_BIT_TRIGGER_75,
+ KBD_MODE_BIT_TRIGGER_100,
+};
+
+#define kbd_is_als_mode_bit(bit) \
+ ((bit) == KBD_MODE_BIT_ALS || (bit) == KBD_MODE_BIT_TRIGGER_ALS)
+#define kbd_is_trigger_mode_bit(bit) \
+ ((bit) >= KBD_MODE_BIT_TRIGGER_ALS && (bit) <= KBD_MODE_BIT_TRIGGER_100)
+#define kbd_is_level_mode_bit(bit) \
+ ((bit) >= KBD_MODE_BIT_TRIGGER_25 && (bit) <= KBD_MODE_BIT_TRIGGER_100)
+
+struct kbd_info {
+ u16 modes;
+ u8 type;
+ u8 triggers;
+ u8 levels;
+ u8 seconds;
+ u8 minutes;
+ u8 hours;
+ u8 days;
+};
+
+struct kbd_state {
+ u8 mode_bit;
+ u8 triggers;
+ u8 timeout_value;
+ u8 timeout_unit;
+ u8 als_setting;
+ u8 als_value;
+ u8 level;
+};
+
+static const int kbd_tokens[] = {
+ KBD_LED_OFF_TOKEN,
+ KBD_LED_AUTO_25_TOKEN,
+ KBD_LED_AUTO_50_TOKEN,
+ KBD_LED_AUTO_75_TOKEN,
+ KBD_LED_AUTO_100_TOKEN,
+ KBD_LED_ON_TOKEN,
+};
+
+static u16 kbd_token_bits;
+
+static struct kbd_info kbd_info;
+static bool kbd_als_supported;
+static bool kbd_triggers_supported;
+
+static u8 kbd_mode_levels[16];
+static int kbd_mode_levels_count;
+
+static u8 kbd_previous_level;
+static u8 kbd_previous_mode_bit;
+
+static bool kbd_led_present;
+
+/*
+ * NOTE: there are three ways to set the keyboard backlight level.
+ * First, via kbd_state.mode_bit (assigning KBD_MODE_BIT_TRIGGER_* value).
+ * Second, via kbd_state.level (assigning numerical value <= kbd_info.levels).
+ * Third, via SMBIOS tokens (KBD_LED_* in kbd_tokens)
+ *
+ * There are laptops which support only one of these methods. If we want to
+ * support as many machines as possible we need to implement all three methods.
+ * The first two methods use the kbd_state structure. The third uses SMBIOS
+ * tokens. If kbd_info.levels == 0, the machine does not support setting the
+ * keyboard backlight level via kbd_state.level.
+ */
+
+static int kbd_get_info(struct kbd_info *info)
+{
+ u8 units;
+ int ret;
+
+ get_buffer();
+
+ buffer->input[0] = 0x0;
+ dell_send_request(buffer, 4, 11);
+ ret = buffer->output[0];
+
+ if (ret) {
+ ret = dell_smi_error(ret);
+ goto out;
+ }
+
+ info->modes = buffer->output[1] & 0xFFFF;
+ info->type = (buffer->output[1] >> 24) & 0xFF;
+ info->triggers = buffer->output[2] & 0xFF;
+ units = (buffer->output[2] >> 8) & 0xFF;
+ info->levels = (buffer->output[2] >> 16) & 0xFF;
+
+ if (units & BIT(0))
+ info->seconds = (buffer->output[3] >> 0) & 0xFF;
+ if (units & BIT(1))
+ info->minutes = (buffer->output[3] >> 8) & 0xFF;
+ if (units & BIT(2))
+ info->hours = (buffer->output[3] >> 16) & 0xFF;
+ if (units & BIT(3))
+ info->days = (buffer->output[3] >> 24) & 0xFF;
+
+ out:
+ release_buffer();
+ return ret;
+}
+
+static unsigned int kbd_get_max_level(void)
+{
+ if (kbd_info.levels != 0)
+ return kbd_info.levels;
+ if (kbd_mode_levels_count > 0)
+ return kbd_mode_levels_count - 1;
+ return 0;
+}
+
+static int kbd_get_level(struct kbd_state *state)
+{
+ int i;
+
+ if (kbd_info.levels != 0)
+ return state->level;
+
+ if (kbd_mode_levels_count > 0) {
+ for (i = 0; i < kbd_mode_levels_count; ++i)
+ if (kbd_mode_levels[i] == state->mode_bit)
+ return i;
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+static int kbd_set_level(struct kbd_state *state, u8 level)
+{
+ if (kbd_info.levels != 0) {
+ if (level != 0)
+ kbd_previous_level = level;
+ if (state->level == level)
+ return 0;
+ state->level = level;
+ if (level != 0 && state->mode_bit == KBD_MODE_BIT_OFF)
+ state->mode_bit = kbd_previous_mode_bit;
+ else if (level == 0 && state->mode_bit != KBD_MODE_BIT_OFF) {
+ kbd_previous_mode_bit = state->mode_bit;
+ state->mode_bit = KBD_MODE_BIT_OFF;
+ }
+ return 0;
+ }
+
+ if (kbd_mode_levels_count > 0 && level < kbd_mode_levels_count) {
+ if (level != 0)
+ kbd_previous_level = level;
+ state->mode_bit = kbd_mode_levels[level];
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+static int kbd_get_state(struct kbd_state *state)
+{
+ int ret;
+
+ get_buffer();
+
+ buffer->input[0] = 0x1;
+ dell_send_request(buffer, 4, 11);
+ ret = buffer->output[0];
+
+ if (ret) {
+ ret = dell_smi_error(ret);
+ goto out;
+ }
+
+ state->mode_bit = ffs(buffer->output[1] & 0xFFFF);
+ if (state->mode_bit != 0)
+ state->mode_bit--;
+
+ state->triggers = (buffer->output[1] >> 16) & 0xFF;
+ state->timeout_value = (buffer->output[1] >> 24) & 0x3F;
+ state->timeout_unit = (buffer->output[1] >> 30) & 0x3;
+ state->als_setting = buffer->output[2] & 0xFF;
+ state->als_value = (buffer->output[2] >> 8) & 0xFF;
+ state->level = (buffer->output[2] >> 16) & 0xFF;
+
+ out:
+ release_buffer();
+ return ret;
+}
+
+static int kbd_set_state(struct kbd_state *state)
+{
+ int ret;
+
+ get_buffer();
+ buffer->input[0] = 0x2;
+ buffer->input[1] = BIT(state->mode_bit) & 0xFFFF;
+ buffer->input[1] |= (state->triggers & 0xFF) << 16;
+ buffer->input[1] |= (state->timeout_value & 0x3F) << 24;
+ buffer->input[1] |= (state->timeout_unit & 0x3) << 30;
+ buffer->input[2] = state->als_setting & 0xFF;
+ buffer->input[2] |= (state->level & 0xFF) << 16;
+ dell_send_request(buffer, 4, 11);
+ ret = buffer->output[0];
+ release_buffer();
+
+ return dell_smi_error(ret);
+}
+
+static int kbd_set_state_safe(struct kbd_state *state, struct kbd_state *old)
+{
+ int ret;
+
+ ret = kbd_set_state(state);
+ if (ret == 0)
+ return 0;
+
+ /*
+ * When setting the new state fails,try to restore the previous one.
+ * This is needed on some machines where BIOS sets a default state when
+ * setting a new state fails. This default state could be all off.
+ */
+
+ if (kbd_set_state(old))
+ pr_err("Setting old previous keyboard state failed\n");
+
+ return ret;
+}
+
+static int kbd_set_token_bit(u8 bit)
+{
+ int id;
+ int ret;
+
+ if (bit >= ARRAY_SIZE(kbd_tokens))
+ return -EINVAL;
+
+ id = find_token_id(kbd_tokens[bit]);
+ if (id == -1)
+ return -EINVAL;
+
+ get_buffer();
+ buffer->input[0] = da_tokens[id].location;
+ buffer->input[1] = da_tokens[id].value;
+ dell_send_request(buffer, 1, 0);
+ ret = buffer->output[0];
+ release_buffer();
+
+ return dell_smi_error(ret);
+}
+
+static int kbd_get_token_bit(u8 bit)
+{
+ int id;
+ int ret;
+ int val;
+
+ if (bit >= ARRAY_SIZE(kbd_tokens))
+ return -EINVAL;
+
+ id = find_token_id(kbd_tokens[bit]);
+ if (id == -1)
+ return -EINVAL;
+
+ get_buffer();
+ buffer->input[0] = da_tokens[id].location;
+ dell_send_request(buffer, 0, 0);
+ ret = buffer->output[0];
+ val = buffer->output[1];
+ release_buffer();
+
+ if (ret)
+ return dell_smi_error(ret);
+
+ return (val == da_tokens[id].value);
+}
+
+static int kbd_get_first_active_token_bit(void)
+{
+ int i;
+ int ret;
+
+ for (i = 0; i < ARRAY_SIZE(kbd_tokens); ++i) {
+ ret = kbd_get_token_bit(i);
+ if (ret == 1)
+ return i;
+ }
+
+ return ret;
+}
+
+static int kbd_get_valid_token_counts(void)
+{
+ return hweight16(kbd_token_bits);
+}
+
+static inline int kbd_init_info(void)
+{
+ struct kbd_state state;
+ int ret;
+ int i;
+
+ ret = kbd_get_info(&kbd_info);
+ if (ret)
+ return ret;
+
+ kbd_get_state(&state);
+
+ /* NOTE: timeout value is stored in 6 bits so max value is 63 */
+ if (kbd_info.seconds > 63)
+ kbd_info.seconds = 63;
+ if (kbd_info.minutes > 63)
+ kbd_info.minutes = 63;
+ if (kbd_info.hours > 63)
+ kbd_info.hours = 63;
+ if (kbd_info.days > 63)
+ kbd_info.days = 63;
+
+ /* NOTE: On tested machines ON mode did not work and caused
+ * problems (turned backlight off) so do not use it
+ */
+ kbd_info.modes &= ~BIT(KBD_MODE_BIT_ON);
+
+ kbd_previous_level = kbd_get_level(&state);
+ kbd_previous_mode_bit = state.mode_bit;
+
+ if (kbd_previous_level == 0 && kbd_get_max_level() != 0)
+ kbd_previous_level = 1;
+
+ if (kbd_previous_mode_bit == KBD_MODE_BIT_OFF) {
+ kbd_previous_mode_bit =
+ ffs(kbd_info.modes & ~BIT(KBD_MODE_BIT_OFF));
+ if (kbd_previous_mode_bit != 0)
+ kbd_previous_mode_bit--;
+ }
+
+ if (kbd_info.modes & (BIT(KBD_MODE_BIT_ALS) |
+ BIT(KBD_MODE_BIT_TRIGGER_ALS)))
+ kbd_als_supported = true;
+
+ if (kbd_info.modes & (
+ BIT(KBD_MODE_BIT_TRIGGER_ALS) | BIT(KBD_MODE_BIT_TRIGGER) |
+ BIT(KBD_MODE_BIT_TRIGGER_25) | BIT(KBD_MODE_BIT_TRIGGER_50) |
+ BIT(KBD_MODE_BIT_TRIGGER_75) | BIT(KBD_MODE_BIT_TRIGGER_100)
+ ))
+ kbd_triggers_supported = true;
+
+ /* kbd_mode_levels[0] is reserved, see below */
+ for (i = 0; i < 16; ++i)
+ if (kbd_is_level_mode_bit(i) && (BIT(i) & kbd_info.modes))
+ kbd_mode_levels[1 + kbd_mode_levels_count++] = i;
+
+ /*
+ * Find the first supported mode and assign to kbd_mode_levels[0].
+ * This should be 0 (off), but we cannot depend on the BIOS to
+ * support 0.
+ */
+ if (kbd_mode_levels_count > 0) {
+ for (i = 0; i < 16; ++i) {
+ if (BIT(i) & kbd_info.modes) {
+ kbd_mode_levels[0] = i;
+ break;
+ }
+ }
+ kbd_mode_levels_count++;
+ }
+
+ return 0;
+
+}
+
+static inline void kbd_init_tokens(void)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(kbd_tokens); ++i)
+ if (find_token_id(kbd_tokens[i]) != -1)
+ kbd_token_bits |= BIT(i);
+}
+
+static void kbd_init(void)
+{
+ int ret;
+
+ ret = kbd_init_info();
+ kbd_init_tokens();
+
+ if (kbd_token_bits != 0 || ret == 0)
+ kbd_led_present = true;
+}
+
+static ssize_t kbd_led_timeout_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct kbd_state new_state;
+ struct kbd_state state;
+ bool convert;
+ int value;
+ int ret;
+ char ch;
+ u8 unit;
+ int i;
+
+ ret = sscanf(buf, "%d %c", &value, &ch);
+ if (ret < 1)
+ return -EINVAL;
+ else if (ret == 1)
+ ch = 's';
+
+ if (value < 0)
+ return -EINVAL;
+
+ convert = false;
+
+ switch (ch) {
+ case 's':
+ if (value > kbd_info.seconds)
+ convert = true;
+ unit = KBD_TIMEOUT_SECONDS;
+ break;
+ case 'm':
+ if (value > kbd_info.minutes)
+ convert = true;
+ unit = KBD_TIMEOUT_MINUTES;
+ break;
+ case 'h':
+ if (value > kbd_info.hours)
+ convert = true;
+ unit = KBD_TIMEOUT_HOURS;
+ break;
+ case 'd':
+ if (value > kbd_info.days)
+ convert = true;
+ unit = KBD_TIMEOUT_DAYS;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (quirks && quirks->needs_kbd_timeouts)
+ convert = true;
+
+ if (convert) {
+ /* Convert value from current units to seconds */
+ switch (unit) {
+ case KBD_TIMEOUT_DAYS:
+ value *= 24;
+ case KBD_TIMEOUT_HOURS:
+ value *= 60;
+ case KBD_TIMEOUT_MINUTES:
+ value *= 60;
+ unit = KBD_TIMEOUT_SECONDS;
+ }
+
+ if (quirks && quirks->needs_kbd_timeouts) {
+ for (i = 0; quirks->kbd_timeouts[i] != -1; i++) {
+ if (value <= quirks->kbd_timeouts[i]) {
+ value = quirks->kbd_timeouts[i];
+ break;
+ }
+ }
+ }
+
+ if (value <= kbd_info.seconds && kbd_info.seconds) {
+ unit = KBD_TIMEOUT_SECONDS;
+ } else if (value / 60 <= kbd_info.minutes && kbd_info.minutes) {
+ value /= 60;
+ unit = KBD_TIMEOUT_MINUTES;
+ } else if (value / (60 * 60) <= kbd_info.hours && kbd_info.hours) {
+ value /= (60 * 60);
+ unit = KBD_TIMEOUT_HOURS;
+ } else if (value / (60 * 60 * 24) <= kbd_info.days && kbd_info.days) {
+ value /= (60 * 60 * 24);
+ unit = KBD_TIMEOUT_DAYS;
+ } else {
+ return -EINVAL;
+ }
+ }
+
+ ret = kbd_get_state(&state);
+ if (ret)
+ return ret;
+
+ new_state = state;
+ new_state.timeout_value = value;
+ new_state.timeout_unit = unit;
+
+ ret = kbd_set_state_safe(&new_state, &state);
+ if (ret)
+ return ret;
+
+ return count;
+}
+
+static ssize_t kbd_led_timeout_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct kbd_state state;
+ int ret;
+ int len;
+
+ ret = kbd_get_state(&state);
+ if (ret)
+ return ret;
+
+ len = sprintf(buf, "%d", state.timeout_value);
+
+ switch (state.timeout_unit) {
+ case KBD_TIMEOUT_SECONDS:
+ return len + sprintf(buf+len, "s\n");
+ case KBD_TIMEOUT_MINUTES:
+ return len + sprintf(buf+len, "m\n");
+ case KBD_TIMEOUT_HOURS:
+ return len + sprintf(buf+len, "h\n");
+ case KBD_TIMEOUT_DAYS:
+ return len + sprintf(buf+len, "d\n");
+ default:
+ return -EINVAL;
+ }
+
+ return len;
+}
+
+static DEVICE_ATTR(stop_timeout, S_IRUGO | S_IWUSR,
+ kbd_led_timeout_show, kbd_led_timeout_store);
+
+static const char * const kbd_led_triggers[] = {
+ "keyboard",
+ "touchpad",
+ /*"trackstick"*/ NULL, /* NOTE: trackstick is just alias for touchpad */
+ "mouse",
+};
+
+static ssize_t kbd_led_triggers_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct kbd_state new_state;
+ struct kbd_state state;
+ bool triggers_enabled = false;
+ int trigger_bit = -1;
+ char trigger[21];
+ int i, ret;
+
+ ret = sscanf(buf, "%20s", trigger);
+ if (ret != 1)
+ return -EINVAL;
+
+ if (trigger[0] != '+' && trigger[0] != '-')
+ return -EINVAL;
+
+ ret = kbd_get_state(&state);
+ if (ret)
+ return ret;
+
+ if (kbd_triggers_supported)
+ triggers_enabled = kbd_is_trigger_mode_bit(state.mode_bit);
+
+ if (kbd_triggers_supported) {
+ for (i = 0; i < ARRAY_SIZE(kbd_led_triggers); ++i) {
+ if (!(kbd_info.triggers & BIT(i)))
+ continue;
+ if (!kbd_led_triggers[i])
+ continue;
+ if (strcmp(trigger+1, kbd_led_triggers[i]) != 0)
+ continue;
+ if (trigger[0] == '+' &&
+ triggers_enabled && (state.triggers & BIT(i)))
+ return count;
+ if (trigger[0] == '-' &&
+ (!triggers_enabled || !(state.triggers & BIT(i))))
+ return count;
+ trigger_bit = i;
+ break;
+ }
+ }
+
+ if (trigger_bit != -1) {
+ new_state = state;
+ if (trigger[0] == '+')
+ new_state.triggers |= BIT(trigger_bit);
+ else {
+ new_state.triggers &= ~BIT(trigger_bit);
+ /* NOTE: trackstick bit (2) must be disabled when
+ * disabling touchpad bit (1), otherwise touchpad
+ * bit (1) will not be disabled */
+ if (trigger_bit == 1)
+ new_state.triggers &= ~BIT(2);
+ }
+ if ((kbd_info.triggers & new_state.triggers) !=
+ new_state.triggers)
+ return -EINVAL;
+ if (new_state.triggers && !triggers_enabled) {
+ new_state.mode_bit = KBD_MODE_BIT_TRIGGER;
+ kbd_set_level(&new_state, kbd_previous_level);
+ } else if (new_state.triggers == 0) {
+ kbd_set_level(&new_state, 0);
+ }
+ if (!(kbd_info.modes & BIT(new_state.mode_bit)))
+ return -EINVAL;
+ ret = kbd_set_state_safe(&new_state, &state);
+ if (ret)
+ return ret;
+ if (new_state.mode_bit != KBD_MODE_BIT_OFF)
+ kbd_previous_mode_bit = new_state.mode_bit;
+ return count;
+ }
+
+ return -EINVAL;
+}
+
+static ssize_t kbd_led_triggers_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct kbd_state state;
+ bool triggers_enabled;
+ int level, i, ret;
+ int len = 0;
+
+ ret = kbd_get_state(&state);
+ if (ret)
+ return ret;
+
+ len = 0;
+
+ if (kbd_triggers_supported) {
+ triggers_enabled = kbd_is_trigger_mode_bit(state.mode_bit);
+ level = kbd_get_level(&state);
+ for (i = 0; i < ARRAY_SIZE(kbd_led_triggers); ++i) {
+ if (!(kbd_info.triggers & BIT(i)))
+ continue;
+ if (!kbd_led_triggers[i])
+ continue;
+ if ((triggers_enabled || level <= 0) &&
+ (state.triggers & BIT(i)))
+ buf[len++] = '+';
+ else
+ buf[len++] = '-';
+ len += sprintf(buf+len, "%s ", kbd_led_triggers[i]);
+ }
+ }
+
+ if (len)
+ buf[len - 1] = '\n';
+
+ return len;
+}
+
+static DEVICE_ATTR(start_triggers, S_IRUGO | S_IWUSR,
+ kbd_led_triggers_show, kbd_led_triggers_store);
+
+static ssize_t kbd_led_als_enabled_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct kbd_state new_state;
+ struct kbd_state state;
+ bool triggers_enabled = false;
+ int enable;
+ int ret;
+
+ ret = kstrtoint(buf, 0, &enable);
+ if (ret)
+ return ret;
+
+ ret = kbd_get_state(&state);
+ if (ret)
+ return ret;
+
+ if (enable == kbd_is_als_mode_bit(state.mode_bit))
+ return count;
+
+ new_state = state;
+
+ if (kbd_triggers_supported)
+ triggers_enabled = kbd_is_trigger_mode_bit(state.mode_bit);
+
+ if (enable) {
+ if (triggers_enabled)
+ new_state.mode_bit = KBD_MODE_BIT_TRIGGER_ALS;
+ else
+ new_state.mode_bit = KBD_MODE_BIT_ALS;
+ } else {
+ if (triggers_enabled) {
+ new_state.mode_bit = KBD_MODE_BIT_TRIGGER;
+ kbd_set_level(&new_state, kbd_previous_level);
+ } else {
+ new_state.mode_bit = KBD_MODE_BIT_ON;
+ }
+ }
+ if (!(kbd_info.modes & BIT(new_state.mode_bit)))
+ return -EINVAL;
+
+ ret = kbd_set_state_safe(&new_state, &state);
+ if (ret)
+ return ret;
+ kbd_previous_mode_bit = new_state.mode_bit;
+
+ return count;
+}
+
+static ssize_t kbd_led_als_enabled_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct kbd_state state;
+ bool enabled = false;
+ int ret;
+
+ ret = kbd_get_state(&state);
+ if (ret)
+ return ret;
+ enabled = kbd_is_als_mode_bit(state.mode_bit);
+
+ return sprintf(buf, "%d\n", enabled ? 1 : 0);
+}
+
+static DEVICE_ATTR(als_enabled, S_IRUGO | S_IWUSR,
+ kbd_led_als_enabled_show, kbd_led_als_enabled_store);
+
+static ssize_t kbd_led_als_setting_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct kbd_state state;
+ struct kbd_state new_state;
+ u8 setting;
+ int ret;
+
+ ret = kstrtou8(buf, 10, &setting);
+ if (ret)
+ return ret;
+
+ ret = kbd_get_state(&state);
+ if (ret)
+ return ret;
+
+ new_state = state;
+ new_state.als_setting = setting;
+
+ ret = kbd_set_state_safe(&new_state, &state);
+ if (ret)
+ return ret;
+
+ return count;
+}
+
+static ssize_t kbd_led_als_setting_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct kbd_state state;
+ int ret;
+
+ ret = kbd_get_state(&state);
+ if (ret)
+ return ret;
+
+ return sprintf(buf, "%d\n", state.als_setting);
+}
+
+static DEVICE_ATTR(als_setting, S_IRUGO | S_IWUSR,
+ kbd_led_als_setting_show, kbd_led_als_setting_store);
+
+static struct attribute *kbd_led_attrs[] = {
+ &dev_attr_stop_timeout.attr,
+ &dev_attr_start_triggers.attr,
+ NULL,
+};
+
+static const struct attribute_group kbd_led_group = {
+ .attrs = kbd_led_attrs,
+};
+
+static struct attribute *kbd_led_als_attrs[] = {
+ &dev_attr_als_enabled.attr,
+ &dev_attr_als_setting.attr,
+ NULL,
+};
+
+static const struct attribute_group kbd_led_als_group = {
+ .attrs = kbd_led_als_attrs,
+};
+
+static const struct attribute_group *kbd_led_groups[] = {
+ &kbd_led_group,
+ &kbd_led_als_group,
+ NULL,
+};
+
+static enum led_brightness kbd_led_level_get(struct led_classdev *led_cdev)
+{
+ int ret;
+ u16 num;
+ struct kbd_state state;
+
+ if (kbd_get_max_level()) {
+ ret = kbd_get_state(&state);
+ if (ret)
+ return 0;
+ ret = kbd_get_level(&state);
+ if (ret < 0)
+ return 0;
+ return ret;
+ }
+
+ if (kbd_get_valid_token_counts()) {
+ ret = kbd_get_first_active_token_bit();
+ if (ret < 0)
+ return 0;
+ for (num = kbd_token_bits; num != 0 && ret > 0; --ret)
+ num &= num - 1; /* clear the first bit set */
+ if (num == 0)
+ return 0;
+ return ffs(num) - 1;
+ }
+
+ pr_warn("Keyboard brightness level control not supported\n");
+ return 0;
+}
+
+static void kbd_led_level_set(struct led_classdev *led_cdev,
+ enum led_brightness value)
+{
+ struct kbd_state state;
+ struct kbd_state new_state;
+ u16 num;
+
+ if (kbd_get_max_level()) {
+ if (kbd_get_state(&state))
+ return;
+ new_state = state;
+ if (kbd_set_level(&new_state, value))
+ return;
+ kbd_set_state_safe(&new_state, &state);
+ return;
+ }
+
+ if (kbd_get_valid_token_counts()) {
+ for (num = kbd_token_bits; num != 0 && value > 0; --value)
+ num &= num - 1; /* clear the first bit set */
+ if (num == 0)
+ return;
+ kbd_set_token_bit(ffs(num) - 1);
+ return;
+ }
+
+ pr_warn("Keyboard brightness level control not supported\n");
+}
+
+static struct led_classdev kbd_led = {
+ .name = "dell::kbd_backlight",
+ .brightness_set = kbd_led_level_set,
+ .brightness_get = kbd_led_level_get,
+ .groups = kbd_led_groups,
+};
+
+static int __init kbd_led_init(struct device *dev)
+{
+ kbd_init();
+ if (!kbd_led_present)
+ return -ENODEV;
+ if (!kbd_als_supported)
+ kbd_led_groups[1] = NULL;
+ kbd_led.max_brightness = kbd_get_max_level();
+ if (!kbd_led.max_brightness) {
+ kbd_led.max_brightness = kbd_get_valid_token_counts();
+ if (kbd_led.max_brightness)
+ kbd_led.max_brightness--;
+ }
+ return led_classdev_register(dev, &kbd_led);
+}
+
+static void brightness_set_exit(struct led_classdev *led_cdev,
+ enum led_brightness value)
+{
+ /* Don't change backlight level on exit */
+};
+
+static void kbd_led_exit(void)
+{
+ if (!kbd_led_present)
+ return;
+ kbd_led.brightness_set = brightness_set_exit;
+ led_classdev_unregister(&kbd_led);
+}
+
static int __init dell_init(void)
{
int max_intensity = 0;
@@ -841,6 +1913,8 @@ static int __init dell_init(void)
if (quirks && quirks->touchpad_led)
touchpad_led_init(&platform_device->dev);
+ kbd_led_init(&platform_device->dev);
+
dell_laptop_dir = debugfs_create_dir("dell_laptop", NULL);
if (dell_laptop_dir != NULL)
debugfs_create_file("rfkill", 0444, dell_laptop_dir, NULL,
@@ -908,6 +1982,7 @@ static void __exit dell_exit(void)
debugfs_remove_recursive(dell_laptop_dir);
if (quirks && quirks->touchpad_led)
touchpad_led_exit();
+ kbd_led_exit();
i8042_remove_filter(dell_laptop_i8042_filter);
cancel_delayed_work_sync(&dell_rfkill_work);
backlight_device_unregister(dell_backlight_device);
@@ -924,5 +1999,7 @@ module_init(dell_init);
module_exit(dell_exit);
MODULE_AUTHOR("Matthew Garrett <mjg@...hat.com>");
+MODULE_AUTHOR("Gabriele Mazzotta <gabriele.mzt@...il.com>");
+MODULE_AUTHOR("Pali Rohár <pali.rohar@...il.com>");
MODULE_DESCRIPTION("Dell laptop driver");
MODULE_LICENSE("GPL");
--
2.1.4
--
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