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Mon, 12 Oct 2026 06:38:44 -0700 (PDT) From: Mingyou Chen To: =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= , Hans de Goede , Ilya Gladyshev Cc: KentoNion , platform-driver-x86@vger.kernel.org, ted eric , Armin Wolf , linux-kernel@vger.kernel.org, Chris Taraszka , Matias Civadda , =?UTF-8?q?=E9=AB=98=20=E4=BF=8A=E6=96=87?= , powerfullz , =?UTF-8?q?=E5=AD=99=20=E8=AA=89=E9=93=AD?= , =?UTF-8?q?Milo=C5=A1=20Vlku?= , Rsplwe , Bozhen Peng , Anton Karasev , Jame Jao , Mingyou Chen Subject: [PATCH v12 5/6] platform/x86: bitland-mifs-wmi: Add quirks table Date: Mon, 12 Oct 2026 21:36:47 +0800 Message-ID: <20261012133648.132363-6-qby140326@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20261012133648.132363-1-qby140326@gmail.com> References: <20261012133648.132363-1-qby140326@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The MIFS WMI interface is shared by several Bitland ODM laptops which differ in the layout of the performance mode values of WMI_FN_SYSTEM_PER_MODE and in the capability checks. Introduce a quirks table to support multiple machine families without sprinkling model checks over the driver. Signed-off-by: Mingyou Chen --- drivers/platform/x86/bitland-mifs-wmi.c | 180 ++++++++++++++++-------- 1 file changed, 122 insertions(+), 58 deletions(-) diff --git a/drivers/platform/x86/bitland-mifs-wmi.c b/drivers/platform/x86/bitland-mifs-wmi.c index 38843d389827..fac1cdbbd778 100644 --- a/drivers/platform/x86/bitland-mifs-wmi.c +++ b/drivers/platform/x86/bitland-mifs-wmi.c @@ -12,6 +12,7 @@ #include #include #include +#include #include #include #include @@ -84,6 +85,41 @@ enum bitland_mifs_power_profile { WMI_PP_FULL_SPEED = 3, }; +struct bitland_mifs_wmi_data; + +struct bitland_profile_entry { + enum platform_profile_option profile; + u8 wmi_val; + bool no_set; +}; + +struct bitland_mifs_quirks { + const struct bitland_profile_entry *profile_entries; + size_t num_profile_entries; + + bool return_code_at_end; + bool skip_ac_type_check; + + /* Accept return value 0 on SET wmi functions */ + bool accept_zero_function; +}; + +static const struct bitland_profile_entry default_profile_entries[] = { + { PLATFORM_PROFILE_LOW_POWER, WMI_PP_QUIET }, + { PLATFORM_PROFILE_BALANCED, WMI_PP_BALANCED }, + { PLATFORM_PROFILE_BALANCED_PERFORMANCE, WMI_PP_PERFORMANCE }, + { PLATFORM_PROFILE_PERFORMANCE, WMI_PP_FULL_SPEED }, +}; + +static const struct bitland_mifs_quirks default_quirks = { + .profile_entries = default_profile_entries, + .num_profile_entries = ARRAY_SIZE(default_profile_entries), +}; + +static const struct dmi_system_id bitland_mifs_dmi_table[] = { + {} +}; + enum bitland_mifs_event_id { WMI_EVENT_SWITCHVIDEOMODE = 1, WMI_EVENT_SELECTIVE_SCREENSHOT = 2, @@ -131,12 +167,24 @@ struct bitland_mifs_input { u8 payload[28]; } __packed; -struct bitland_mifs_output { +struct bitland_mifs_output_head_rc { __le16 return_code; __le16 function; u8 data[28]; } __packed; +struct bitland_mifs_output_tail_rc { + __le16 function; + u8 data[28]; + __le16 return_code; +} __packed; + +union bitland_mifs_output_buf { + struct bitland_mifs_output_head_rc head; + struct bitland_mifs_output_tail_rc tail; + u8 raw[32]; +}; + struct bitland_mifs_event { u8 event_type; u8 event_id; @@ -166,27 +214,41 @@ struct bitland_mifs_wmi_data { struct input_dev *input_dev; struct device *hwmon_dev; struct device *pp_dev; + const struct bitland_mifs_quirks *quirks; enum platform_profile_option saved_profile; }; static int bitland_mifs_wmi_call(struct bitland_mifs_wmi_data *data, const struct bitland_mifs_input *input, - struct bitland_mifs_output *output) + struct bitland_mifs_output_head_rc *output) { struct wmi_buffer in_buf = { .length = sizeof(*input), .data = (void *)input }; struct wmi_buffer out_buf = { 0 }; + const u8 *payload_data; + __le16 return_code; + __le16 function; int ret; guard(mutex)(&data->lock); ret = wmidev_invoke_method(data->wdev, 0, 1, &in_buf, &out_buf, - sizeof(struct bitland_mifs_output)); + sizeof(union bitland_mifs_output_buf)); if (ret) return ret; - struct bitland_mifs_output *result __free(kfree) = out_buf.data; + union bitland_mifs_output_buf *result __free(kfree) = out_buf.data; - switch (le16_to_cpu(result->return_code)) { + if (data->quirks->return_code_at_end) { + return_code = result->tail.return_code; + function = result->tail.function; + payload_data = result->tail.data; + } else { + return_code = result->head.return_code; + function = result->head.function; + payload_data = result->head.data; + } + + switch (le16_to_cpu(return_code)) { case WMI_RETURN_CODE_SUCCESS: break; case WMI_RETURN_CODE_UNKNOWN_FUNCTION: @@ -195,11 +257,16 @@ static int bitland_mifs_wmi_call(struct bitland_mifs_wmi_data *data, return -EIO; } - if (result->function != input->function) - return -ENOMSG; + if (function != input->function) { + if (!(data->quirks->accept_zero_function && function == 0)) + return -ENOMSG; + } - if (output) - memcpy(output, result, sizeof(*output)); + if (output) { + output->return_code = return_code; + output->function = function; + memcpy(output->data, payload_data, sizeof(*output->data)); + } return 0; } @@ -208,45 +275,41 @@ static int laptop_profile_get(struct device *dev, enum platform_profile_option *profile) { struct bitland_mifs_wmi_data *data = dev_get_drvdata(dev); + const struct bitland_mifs_quirks *quirks = data->quirks; struct bitland_mifs_input input = { .operation = cpu_to_le16(WMI_METHOD_GET), .function = cpu_to_le16(WMI_FN_SYSTEM_PER_MODE), }; - struct bitland_mifs_output result; + struct bitland_mifs_output_head_rc result; + size_t i; int ret; ret = bitland_mifs_wmi_call(data, &input, &result); if (ret) return ret; - switch (result.data[0]) { - case WMI_PP_BALANCED: - *profile = PLATFORM_PROFILE_BALANCED; - break; - case WMI_PP_PERFORMANCE: - *profile = PLATFORM_PROFILE_BALANCED_PERFORMANCE; - break; - case WMI_PP_QUIET: - *profile = PLATFORM_PROFILE_LOW_POWER; - break; - case WMI_PP_FULL_SPEED: - *profile = PLATFORM_PROFILE_PERFORMANCE; - break; - default: - return -EINVAL; + for (i = 0; i < quirks->num_profile_entries; i++) { + if (quirks->profile_entries[i].wmi_val == result.data[0]) { + *profile = quirks->profile_entries[i].profile; + return 0; + } } - return 0; + + return -EINVAL; } -static int bitland_check_performance_capability(struct bitland_mifs_wmi_data *data) +static int bitland_pp_check_capability(struct bitland_mifs_wmi_data *data) { struct bitland_mifs_input input = { .operation = cpu_to_le16(WMI_METHOD_GET), .function = cpu_to_le16(WMI_FN_SYSTEM_AC_TYPE), }; - struct bitland_mifs_output output; + struct bitland_mifs_output_head_rc output; int ret; + if (data->quirks->skip_ac_type_check) + return power_supply_is_system_supplied() > 0 ? 0 : -EOPNOTSUPP; + /* Full-speed/performance mode requires DC power (not USB-C) */ if (!power_supply_is_system_supplied()) return -EOPNOTSUPP; @@ -269,47 +332,42 @@ static int laptop_profile_set(struct device *dev, enum platform_profile_option profile) { struct bitland_mifs_wmi_data *data = dev_get_drvdata(dev); + const struct bitland_mifs_quirks *quirks = data->quirks; struct bitland_mifs_input input = { .operation = cpu_to_le16(WMI_METHOD_SET), .function = cpu_to_le16(WMI_FN_SYSTEM_PER_MODE), }; + size_t i; int ret; - u8 val; - switch (profile) { - case PLATFORM_PROFILE_LOW_POWER: - val = WMI_PP_QUIET; - break; - case PLATFORM_PROFILE_BALANCED: - val = WMI_PP_BALANCED; - break; - case PLATFORM_PROFILE_BALANCED_PERFORMANCE: - ret = bitland_check_performance_capability(data); - if (ret) - return ret; - val = WMI_PP_PERFORMANCE; - break; - case PLATFORM_PROFILE_PERFORMANCE: - ret = bitland_check_performance_capability(data); + if (profile == PLATFORM_PROFILE_PERFORMANCE || + profile == PLATFORM_PROFILE_BALANCED_PERFORMANCE) { + ret = bitland_pp_check_capability(data); if (ret) return ret; - val = WMI_PP_FULL_SPEED; - break; - default: - return -EOPNOTSUPP; } - input.payload[0] = val; + for (i = 0; i < quirks->num_profile_entries; i++) { + if (quirks->profile_entries[i].profile == profile && + !quirks->profile_entries[i].no_set) { + input.payload[0] = quirks->profile_entries[i].wmi_val; + return bitland_mifs_wmi_call(data, &input, NULL); + } + } - return bitland_mifs_wmi_call(data, &input, NULL); + return -EOPNOTSUPP; } static int platform_profile_probe(void *drvdata, unsigned long *choices) { - set_bit(PLATFORM_PROFILE_LOW_POWER, choices); - set_bit(PLATFORM_PROFILE_BALANCED, choices); - set_bit(PLATFORM_PROFILE_BALANCED_PERFORMANCE, choices); - set_bit(PLATFORM_PROFILE_PERFORMANCE, choices); + struct bitland_mifs_wmi_data *data = drvdata; + const struct bitland_mifs_quirks *quirks = data->quirks; + size_t i; + + for (i = 0; i < quirks->num_profile_entries; i++) { + if (!quirks->profile_entries[i].no_set) + set_bit(quirks->profile_entries[i].profile, choices); + } return 0; } @@ -366,7 +424,7 @@ static int laptop_hwmon_read(struct device *dev, enum hwmon_sensor_types type, struct bitland_mifs_input input = { .operation = cpu_to_le16(WMI_METHOD_GET), }; - struct bitland_mifs_output res; + struct bitland_mifs_output_head_rc res; int ret; switch (type) { @@ -455,7 +513,7 @@ static enum led_brightness laptop_kbd_led_get(struct led_classdev *led_cdev) .operation = cpu_to_le16(WMI_METHOD_GET), .function = cpu_to_le16(WMI_FN_RGB_KB_BRIGHTNESS), }; - struct bitland_mifs_output res; + struct bitland_mifs_output_head_rc res; int ret; ret = bitland_mifs_wmi_call(data, &input, &res); @@ -480,7 +538,7 @@ static ssize_t gpu_mode_show(struct device *dev, struct device_attribute *attr, .operation = cpu_to_le16(WMI_METHOD_GET), .function = cpu_to_le16(WMI_FN_GPU_MODE), }; - struct bitland_mifs_output res; + struct bitland_mifs_output_head_rc res; u8 mode_val; int ret; @@ -534,7 +592,7 @@ static ssize_t kb_mode_show(struct device *dev, struct device_attribute *attr, .operation = cpu_to_le16(WMI_METHOD_GET), .function = cpu_to_le16(WMI_FN_RGB_KB_MODE), }; - struct bitland_mifs_output res; + struct bitland_mifs_output_head_rc res; u8 mode_val; int ret; @@ -713,6 +771,7 @@ static int bitland_mifs_wmi_probe(struct wmi_device *wdev, const void *context) .default_label = ":" LED_FUNCTION_KBD_BACKLIGHT, .devname_mandatory = true, }; + const struct dmi_system_id *dmi_id; int ret; drv_data = devm_kzalloc(&wdev->dev, sizeof(*drv_data), GFP_KERNEL); @@ -727,6 +786,11 @@ static int bitland_mifs_wmi_probe(struct wmi_device *wdev, const void *context) dev_set_drvdata(&wdev->dev, drv_data); + drv_data->quirks = &default_quirks; + dmi_id = dmi_first_match(bitland_mifs_dmi_table); + if (dmi_id) + drv_data->quirks = dmi_id->driver_data; + if (dev_type == BITLAND_WMI_EVENT) { /* Register input device for hotkeys */ drv_data->input_dev = devm_input_allocate_device(&wdev->dev); -- 2.55.0