Some Dell laptops support configuration of preset fan modes through
smbios tables.
If the platform supports these fan modes, set up platform_profile to
change these modes. If not supported, skip enabling platform_profile.
Signed-off-by: Lyndon Sanche <lsanche@xxxxxxxxxx>
---
v3:
- Convert smbios-thermal-ctl docs to multiline comment and wrap
- Change thermal_mode_bits enum to directly be BIT() values
- Convert related code to use this
- Use FIELD_GET/PREP and GENNMASK for getting/setting thermal modes
- Correct offset for getting current ACC mode, setting offset
unchanged
- Check if thermal_handler is allocated before freeing and
unregistering platform_profile
v2:
- Wrap smbios-thermal-ctl comment
- Return proper error code when invalid state returned
- Simplify platform_profile_get returns
- Propogate ENOMEM error
---
drivers/platform/x86/dell/dell-laptop.c | 232 ++++++++++++++++++++++++
drivers/platform/x86/dell/dell-smbios.h | 1 +
2 files changed, 233 insertions(+)
diff --git a/drivers/platform/x86/dell/dell-laptop.c b/drivers/platform/x86/dell/dell-laptop.c
index 42f7de2b4522..fa58e7751d06 100644
--- a/drivers/platform/x86/dell/dell-laptop.c
+++ b/drivers/platform/x86/dell/dell-laptop.c
@@ -27,6 +27,8 @@
#include <linux/i8042.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
+#include <linux/platform_profile.h>
+#include <linux/bitfield.h>
#include <acpi/video.h>
#include "dell-rbtn.h"
#include "dell-smbios.h"
@@ -95,6 +97,7 @@ static struct backlight_device *dell_backlight_device;
static struct rfkill *wifi_rfkill;
static struct rfkill *bluetooth_rfkill;
static struct rfkill *wwan_rfkill;
+static struct platform_profile_handler *thermal_handler;
static bool force_rfkill;
static bool micmute_led_registered;
static bool mute_led_registered;
@@ -2199,6 +2202,227 @@ static int mute_led_set(struct led_classdev *led_cdev,
return 0;
}
+/* Derived from smbios-thermal-ctl
+ *
+ * cbClass 17
+ * cbSelect 19
+ * User Selectable Thermal Tables(USTT)
+ * cbArg1 determines the function to be performed
+ * cbArg1 0x0 = Get Thermal Information
+ * cbRES1 Standard return codes (0, -1, -2)
+ * cbRES2, byte 0 Bitmap of supported thermal modes. A mode is supported if
+ * its bit is set to 1
+ * Bit 0 Balanced
+ * Bit 1 Cool Bottom
+ * Bit 2 Quiet
+ * Bit 3 Performance
+ * cbRES2, byte 1 Bitmap of supported Active Acoustic Controller (AAC) modes.
+ * Each mode corresponds to the supported thermal modes in
+ * byte 0. A mode is supported if its bit is set to 1.
+ * Bit 0 AAC (Balanced)
+ * Bit 1 AAC (Cool Bottom
+ * Bit 2 AAC (Quiet)
+ * Bit 3 AAC (Performance)
+ * cbRes3, byte 0 Current Thermal Mode
+ * Bit 0 Balanced
+ * Bit 1 Cool Bottom
+ * Bit 2 Quiet
+ * Bit 3 Performanc
+ * cbRes3, byte 1 AAC Configuration type
+ * 0 Global (AAC enable/disable applies to all supported USTT modes)
+ * 1 USTT mode specific
+ * cbRes3, byte 2 Current Active Acoustic Controller (AAC) Mode
+ * If AAC Configuration Type is Global,
+ * 0 AAC mode disabled
+ * 1 AAC mode enabled
+ * If AAC Configuration Type is USTT mode specific (multiple bits may be set),
+ * Bit 0 AAC (Balanced)
+ * Bit 1 AAC (Cool Bottom
+ * Bit 2 AAC (Quiet)
+ * Bit 3 AAC (Performance)
+ * cbRes3, byte 3 Current Fan Failure Mode
+ * Bit 0 Minimal Fan Failure (at least one fan has failed, one fan working)
+ * Bit 1 Catastrophic Fan Failure (all fans have failed)
+ * cbArg1 0x1 (Set Thermal Information), both desired thermal mode and
+ * desired AAC mode shall be applied
+ * cbArg2, byte 0 Desired Thermal Mode to set
+ * (only one bit may be set for this parameter)
+ * Bit 0 Balanced
+ * Bit 1 Cool Bottom
+ * Bit 2 Quiet
+ * Bit 3 Performance
+ * cbArg2, byte 1 Desired Active Acoustic Controller (AAC) Mode to set
+ * If AAC Configuration Type is Global,
+ * 0 AAC mode disabled
+ * 1 AAC mode enabled
+ *
+ * If AAC Configuration Type is USTT mode specific
+ * (multiple bits may be set for this parameter),
+ * Bit 0 AAC (Balanced)
+ * Bit 1 AAC (Cool Bottom
+ * Bit 2 AAC (Quiet)
+ * Bit 3 AAC (Performance)
+ */
+
+#define DELL_ACC_GET_FIELD GENMASK(19, 16)
+#define DELL_ACC_SET_FIELD GENMASK(11, 8)
+#define DELL_THERMAL_SUPPORTED GENMASK(3, 0)
+
+enum thermal_mode_bits {
+ DELL_BALANCED = BIT(0),
+ DELL_COOL_BOTTOM = BIT(1),
+ DELL_QUIET = BIT(2),
+ DELL_PERFORMANCE = BIT(3),
+};
+
+static int thermal_get_mode(void)
+{
+ struct calling_interface_buffer buffer;
+ int state;
+ int ret;
+
+ dell_fill_request(&buffer, 0x0, 0, 0, 0);
+ ret = dell_send_request(&buffer, CLASS_INFO, SELECT_THERMAL_MANAGEMENT);
+ if (ret)
+ return ret;
+ state = buffer.output[2];
+ if (state & DELL_BALANCED)
+ return DELL_BALANCED;
+ else if (state & DELL_COOL_BOTTOM)
+ return DELL_COOL_BOTTOM;
+ else if (state & DELL_QUIET)
+ return DELL_QUIET;
+ else if (state & DELL_PERFORMANCE)
+ return DELL_PERFORMANCE;
+ else
+ return -ENXIO;
+}
+
+static int thermal_get_supported_modes(int *supported_bits)
+{
+ struct calling_interface_buffer buffer;
+ int ret;
+
+ dell_fill_request(&buffer, 0x0, 0, 0, 0);
+ ret = dell_send_request(&buffer, CLASS_INFO, SELECT_THERMAL_MANAGEMENT);
+ if (ret)
+ return ret;
+ *supported_bits = FIELD_GET(DELL_THERMAL_SUPPORTED, buffer.output[1]);
+ return 0;
+}
+
+static int thermal_get_acc_mode(int *acc_mode)
+{
+ struct calling_interface_buffer buffer;
+ int ret;
+
+ dell_fill_request(&buffer, 0x0, 0, 0, 0);
+ ret = dell_send_request(&buffer, CLASS_INFO, SELECT_THERMAL_MANAGEMENT);
+ if (ret)
+ return ret;
+ *acc_mode = FIELD_GET(DELL_ACC_GET_FIELD, buffer.output[3]);
+ return 0;
+}
+
+static int thermal_set_mode(enum thermal_mode_bits state)
+{
+ struct calling_interface_buffer buffer;
+ int ret;
+ int acc_mode;
+
+ ret = thermal_get_acc_mode(&acc_mode);
+ if (ret)
+ return ret;
+
+ dell_fill_request(&buffer, 0x1, FIELD_PREP(DELL_ACC_SET_FIELD, acc_mode) | state, 0, 0);
+ ret = dell_send_request(&buffer, CLASS_INFO, SELECT_THERMAL_MANAGEMENT);
+ return ret;
+}
+
+static int thermal_platform_profile_set(struct platform_profile_handler *pprof,
+ enum platform_profile_option profile)
+{
+ switch (profile) {
+ case PLATFORM_PROFILE_BALANCED:
+ return thermal_set_mode(DELL_BALANCED);
+ case PLATFORM_PROFILE_PERFORMANCE:
+ return thermal_set_mode(DELL_PERFORMANCE);
+ case PLATFORM_PROFILE_QUIET:
+ return thermal_set_mode(DELL_QUIET);
+ case PLATFORM_PROFILE_COOL:
+ return thermal_set_mode(DELL_COOL_BOTTOM);
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
+static int thermal_platform_profile_get(struct platform_profile_handler *pprof,
+ enum platform_profile_option *profile)
+{
+ int ret = thermal_get_mode();
+
+ if (ret < 0)
+ return ret;
+
+ switch (ret) {
+ case DELL_BALANCED:
+ *profile = PLATFORM_PROFILE_BALANCED;
+ break;
+ case DELL_PERFORMANCE:
+ *profile = PLATFORM_PROFILE_PERFORMANCE;
+ break;
+ case DELL_COOL_BOTTOM:
+ *profile = PLATFORM_PROFILE_COOL;
+ break;
+ case DELL_QUIET:
+ *profile = PLATFORM_PROFILE_QUIET;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+int thermal_init(void)
+{
+ int ret;
+ int supported_modes;
+
+ ret = thermal_get_supported_modes(&supported_modes);
+ if (ret || !supported_modes)
+ return 0;
+
+ thermal_handler = kzalloc(sizeof(*thermal_handler), GFP_KERNEL);
+ if (!thermal_handler)
+ return -ENOMEM;
+ thermal_handler->profile_get = thermal_platform_profile_get;
+ thermal_handler->profile_set = thermal_platform_profile_set;
+
+ if (supported_modes & DELL_QUIET)
+ set_bit(PLATFORM_PROFILE_QUIET, thermal_handler->choices);
+ if (supported_modes & DELL_COOL_BOTTOM)
+ set_bit(PLATFORM_PROFILE_COOL, thermal_handler->choices);
+ if (supported_modes & DELL_BALANCED)
+ set_bit(PLATFORM_PROFILE_BALANCED, thermal_handler->choices);
+ if (supported_modes & DELL_PERFORMANCE)
+ set_bit(PLATFORM_PROFILE_PERFORMANCE, thermal_handler->choices);
+
+ // Clean up but do not fail
+ if (platform_profile_register(thermal_handler))
+ kfree(thermal_handler);
+
+ return 0;
+}
+
+void thermal_cleanup(void)
+{
+ if (thermal_handler) {
+ platform_profile_remove();
+ kfree(thermal_handler);
+ }
+}
+
static struct led_classdev mute_led_cdev = {
.name = "platform::mute",
.max_brightness = 1,
@@ -2238,6 +2462,11 @@ static int __init dell_init(void)
goto fail_rfkill;
}
+ // Do not fail module if thermal modes not supported, just skip
+ ret = thermal_init();
+ if (ret)
+ goto fail_thermal;
+
if (quirks && quirks->touchpad_led)
touchpad_led_init(&platform_device->dev);
@@ -2317,6 +2546,8 @@ static int __init dell_init(void)
led_classdev_unregister(&mute_led_cdev);
fail_led:
dell_cleanup_rfkill();
+fail_thermal:
+ thermal_cleanup();
fail_rfkill:
platform_device_del(platform_device);
fail_platform_device2:
@@ -2344,6 +2575,7 @@ static void __exit dell_exit(void)
platform_device_unregister(platform_device);
platform_driver_unregister(&platform_driver);
}
+ thermal_cleanup();
}
/* dell-rbtn.c driver export functions which will not work correctly (and could
diff --git a/drivers/platform/x86/dell/dell-smbios.h b/drivers/platform/x86/dell/dell-smbios.h
index eb341bf000c6..585d042f1779 100644
--- a/drivers/platform/x86/dell/dell-smbios.h
+++ b/drivers/platform/x86/dell/dell-smbios.h
@@ -19,6 +19,7 @@
/* Classes and selects used only in kernel drivers */
#define CLASS_KBD_BACKLIGHT 4
#define SELECT_KBD_BACKLIGHT 11
+#define SELECT_THERMAL_MANAGEMENT 19
/* Tokens used in kernel drivers, any of these
* should be filtered from userspace access
--
2.42.0
