Re: [PATCH v5] platform/x86: dell-laptop: Implement platform_profile

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Am 01.05.24 um 23:58 schrieb Lyndon Sanche:

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>
---
v5:
  - Fix indent in smbios-thermal-ctl comment
  - Remove linux/wmi.h include
  - Add 'select ACPI_PLATFORM_PROFILE' to Dell KConfig
v4:
  - Make thermal_init and thermal_cleanup static
  - Rearrange order of added includes, did not edit current includes
  - Include bits.h
  - Switch comment style
  - Return error if platform_profile registering failed
  - Add thermal calls to call_blacklist
  - Align defines with tabs
  - Correct separation of function and error handling
  - Propagate error codes up
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/Kconfig            |   1 +
  drivers/platform/x86/dell/dell-laptop.c      | 238 +++++++++++++++++++
  drivers/platform/x86/dell/dell-smbios-base.c |   1 +
  drivers/platform/x86/dell/dell-smbios.h      |   1 +
  4 files changed, 241 insertions(+)

diff --git a/drivers/platform/x86/dell/Kconfig b/drivers/platform/x86/dell/Kconfig
index bd9f445974cc..5195ad59b44d 100644
--- a/drivers/platform/x86/dell/Kconfig
+++ b/drivers/platform/x86/dell/Kconfig
@@ -57,6 +57,7 @@ config DELL_LAPTOP
  	select POWER_SUPPLY
  	select LEDS_CLASS
  	select NEW_LEDS
+	select ACPI_PLATFORM_PROFILE
  	help
  	This driver adds support for rfkill and backlight control to Dell
  	laptops (except for some models covered by the Compal driver).
diff --git a/drivers/platform/x86/dell/dell-laptop.c b/drivers/platform/x86/dell/dell-laptop.c
index 42f7de2b4522..dc530a4f5047 100644
--- a/drivers/platform/x86/dell/dell-laptop.c
+++ b/drivers/platform/x86/dell/dell-laptop.c
@@ -27,6 +27,9 @@
  #include <linux/i8042.h>
  #include <linux/debugfs.h>
  #include <linux/seq_file.h>
+#include <linux/bitfield.h>
+#include <linux/bits.h>
+#include <linux/platform_profile.h>
  #include <acpi/video.h>
  #include "dell-rbtn.h"
  #include "dell-smbios.h"
@@ -95,6 +98,7 @@ 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 +2203,232 @@ 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;
+
+	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;
+}
+
+static int thermal_init(void)
+{
+	int ret;
+	int supported_modes;
+
+	/* If thermal modes not supported, exit without error */
+	ret = thermal_get_supported_modes(&supported_modes);
+	if (ret < 0)
+		return ret;

Hi,

some older models might not support the USTT commands, which would prevent dell-laptop
from loading on such machines.
Since dell-smbios-base already knows which commands are supported (stored in da_supported_commands),
maybe you can add a function for checking if a certain class of commands is supported and
skip thermal_init() if the USTT commands are not supported.

Thanks,
Armin Wolf

+	if (!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 if failed */
+	ret = platform_profile_register(thermal_handler);
+	if (ret)
+		kfree(thermal_handler);
+
+	return ret;
+}
+
+static 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 +2468,11 @@ 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 +2552,8 @@ 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 +2581,7 @@ 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-base.c b/drivers/platform/x86/dell/dell-smbios-base.c
index e61bfaf8b5c4..5bc2e394dd1c 100644
--- a/drivers/platform/x86/dell/dell-smbios-base.c
+++ b/drivers/platform/x86/dell/dell-smbios-base.c
@@ -71,6 +71,7 @@ static struct smbios_call call_blacklist[] = {
  	/* handled by kernel: dell-laptop */
  	{0x0000, CLASS_INFO, SELECT_RFKILL},
  	{0x0000, CLASS_KBD_BACKLIGHT, SELECT_KBD_BACKLIGHT},
+	{0x0000, CLASS_INFO, SELECT_THERMAL_MANAGEMENT},
  };

  struct token_range {
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





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