Move from WMI driver to platform driver. This move is necessary since the driver is no longer a hotkeys driver only. Platform driver makes it easier for users to access sysfs attributes under (i.e. /sys/devices/platform/huawei-wmi) compared to wmi driver.
Signed-off-by: Ayman Bagabas <ayman.baga...@gmail.com> --- Do you think we should stick to wmi driver especially after "platform/x86: wmi: add context pointer field to struct wmi_device_id" https://patchwork.kernel.org/patch/10963421/ which is basically was my issue with wmi driver where there wasn't a way to distinguish what wmi device is associated with which guid. I believe that platform driver is more suitable for this since it has grown from just a hotkeys driver and users can access sysfs of this easily with platform driver. What do you think? drivers/platform/x86/huawei-wmi.c | 152 +++++++++++++++++++++--------- 1 file changed, 110 insertions(+), 42 deletions(-) diff --git a/drivers/platform/x86/huawei-wmi.c b/drivers/platform/x86/huawei-wmi.c index a1159850a16c..12cae450fc1f 100644 --- a/drivers/platform/x86/huawei-wmi.c +++ b/drivers/platform/x86/huawei-wmi.c @@ -10,6 +10,7 @@ #include <linux/input/sparse-keymap.h> #include <linux/leds.h> #include <linux/module.h> +#include <linux/platform_device.h> #include <linux/wmi.h> /* @@ -23,12 +24,15 @@ struct huawei_wmi_priv { - struct input_dev *idev; + struct input_dev *idev[2]; struct led_classdev cdev; acpi_handle handle; char *acpi_method; + struct platform_device *pdev; }; +struct platform_device *huawei_wmi_pdev; + static const struct key_entry huawei_wmi_keymap[] = { { KE_KEY, 0x281, { KEY_BRIGHTNESSDOWN } }, { KE_KEY, 0x282, { KEY_BRIGHTNESSUP } }, @@ -46,6 +50,8 @@ static const struct key_entry huawei_wmi_keymap[] = { { KE_END, 0 } }; +/* LEDs */ + static int huawei_wmi_micmute_led_set(struct led_classdev *led_cdev, enum led_brightness brightness) { @@ -77,9 +83,9 @@ static int huawei_wmi_micmute_led_set(struct led_classdev *led_cdev, return 0; } -static int huawei_wmi_leds_setup(struct wmi_device *wdev) +static int huawei_wmi_leds_setup(struct device *dev) { - struct huawei_wmi_priv *priv = dev_get_drvdata(&wdev->dev); + struct huawei_wmi_priv *priv = dev_get_drvdata(dev); priv->handle = ec_get_handle(); if (!priv->handle) @@ -97,15 +103,16 @@ static int huawei_wmi_leds_setup(struct wmi_device *wdev) priv->cdev.brightness_set_blocking = huawei_wmi_micmute_led_set; priv->cdev.default_trigger = "audio-micmute"; priv->cdev.brightness = ledtrig_audio_get(LED_AUDIO_MICMUTE); - priv->cdev.dev = &wdev->dev; + priv->cdev.dev = dev; priv->cdev.flags = LED_CORE_SUSPENDRESUME; - return devm_led_classdev_register(&wdev->dev, &priv->cdev); + return devm_led_classdev_register(dev, &priv->cdev); } -static void huawei_wmi_process_key(struct wmi_device *wdev, int code) +/* Input */ + +static void huawei_wmi_process_key(struct input_dev *idev, int code) { - struct huawei_wmi_priv *priv = dev_get_drvdata(&wdev->dev); const struct key_entry *key; /* @@ -129,81 +136,142 @@ static void huawei_wmi_process_key(struct wmi_device *wdev, int code) kfree(response.pointer); } - key = sparse_keymap_entry_from_scancode(priv->idev, code); + key = sparse_keymap_entry_from_scancode(idev, code); if (!key) { - dev_info(&wdev->dev, "Unknown key pressed, code: 0x%04x\n", code); + dev_info(&idev->dev, "Unknown key pressed, code: 0x%04x\n", code); return; } - sparse_keymap_report_entry(priv->idev, key, 1, true); + sparse_keymap_report_entry(idev, key, 1, true); } -static void huawei_wmi_notify(struct wmi_device *wdev, - union acpi_object *obj) +static void huawei_wmi_input_notify(u32 value, void *context) { - if (obj->type == ACPI_TYPE_INTEGER) - huawei_wmi_process_key(wdev, obj->integer.value); + struct input_dev *idev = (struct input_dev *)context; + struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL }; + union acpi_object *obj; + acpi_status status; + + status = wmi_get_event_data(value, &response); + if (ACPI_FAILURE(status)) { + dev_err(&idev->dev, "Unable to get event data\n"); + return; + } + + obj = (union acpi_object *)response.pointer; + if (obj && obj->type == ACPI_TYPE_INTEGER) + huawei_wmi_process_key(idev, obj->integer.value); else - dev_info(&wdev->dev, "Bad response type %d\n", obj->type); + dev_err(&idev->dev, "Bad response type\n"); + + kfree(response.pointer); } -static int huawei_wmi_input_setup(struct wmi_device *wdev) +static int huawei_wmi_input_setup(struct device *dev, + struct input_dev **idev) { - struct huawei_wmi_priv *priv = dev_get_drvdata(&wdev->dev); int err; - priv->idev = devm_input_allocate_device(&wdev->dev); - if (!priv->idev) + *idev = devm_input_allocate_device(dev); + if (!*idev) return -ENOMEM; - priv->idev->name = "Huawei WMI hotkeys"; - priv->idev->phys = "wmi/input0"; - priv->idev->id.bustype = BUS_HOST; - priv->idev->dev.parent = &wdev->dev; + (*idev)->name = "Huawei WMI hotkeys"; + (*idev)->phys = "wmi/input0"; + (*idev)->id.bustype = BUS_HOST; + (*idev)->dev.parent = dev; - err = sparse_keymap_setup(priv->idev, huawei_wmi_keymap, NULL); + err = sparse_keymap_setup(*idev, huawei_wmi_keymap, NULL); if (err) return err; - return input_register_device(priv->idev); + return input_register_device(*idev); } -static int huawei_wmi_probe(struct wmi_device *wdev) +/* Huawei driver */ + +static int huawei_wmi_probe(struct platform_device *pdev) { struct huawei_wmi_priv *priv; int err; - priv = devm_kzalloc(&wdev->dev, sizeof(struct huawei_wmi_priv), GFP_KERNEL); + priv = devm_kzalloc(&pdev->dev, sizeof(struct huawei_wmi_priv), GFP_KERNEL); if (!priv) return -ENOMEM; - dev_set_drvdata(&wdev->dev, priv); + priv->pdev = pdev; + dev_set_drvdata(&pdev->dev, priv); + + if (wmi_has_guid(WMI0_EVENT_GUID)) { + err = huawei_wmi_input_setup(&pdev->dev, &priv->idev[0]) || + wmi_install_notify_handler(WMI0_EVENT_GUID, + huawei_wmi_input_notify, priv->idev[0]); + if (err) { + dev_err(&pdev->dev, "Failed to setup input device\n"); + return err; + } + } - err = huawei_wmi_input_setup(wdev); - if (err) - return err; + if (wmi_has_guid(HWMI_EVENT_GUID)) { + err = huawei_wmi_input_setup(&pdev->dev, &priv->idev[1]) || + wmi_install_notify_handler(HWMI_EVENT_GUID, + huawei_wmi_input_notify, priv->idev[1]); + if (err) { + dev_err(&pdev->dev, "Failed to setup input device\n"); + return err; + } + } - return huawei_wmi_leds_setup(wdev); + return huawei_wmi_leds_setup(&pdev->dev); } -static const struct wmi_device_id huawei_wmi_id_table[] = { - { .guid_string = WMI0_EVENT_GUID }, - { .guid_string = HWMI_EVENT_GUID }, - { } -}; +static int huawei_wmi_remove(struct platform_device *pdev) +{ + if (wmi_has_guid(WMI0_EVENT_GUID)) + wmi_remove_notify_handler(WMI0_EVENT_GUID); + + if (wmi_has_guid(HWMI_EVENT_GUID)) + wmi_remove_notify_handler(HWMI_EVENT_GUID); -static struct wmi_driver huawei_wmi_driver = { + return 0; +} + +static struct platform_driver huawei_wmi_driver = { .driver = { .name = "huawei-wmi", }, - .id_table = huawei_wmi_id_table, .probe = huawei_wmi_probe, - .notify = huawei_wmi_notify, + .remove = huawei_wmi_remove, }; -module_wmi_driver(huawei_wmi_driver); +static __init int huawei_wmi_init(void) +{ + int err; + + err = platform_driver_register(&huawei_wmi_driver); + if (err) + return err; + + huawei_wmi_pdev = platform_device_register_simple("huawei-wmi", -1, NULL, 0); + if (IS_ERR(huawei_wmi_pdev)) { + platform_driver_unregister(&huawei_wmi_driver); + return PTR_ERR(huawei_wmi_pdev); + } + + return 0; +} + +static __exit void huawei_wmi_exit(void) +{ + platform_device_unregister(huawei_wmi_pdev); + platform_driver_unregister(&huawei_wmi_driver); +} + +module_init(huawei_wmi_init); +module_exit(huawei_wmi_exit); -MODULE_DEVICE_TABLE(wmi, huawei_wmi_id_table); +MODULE_ALIAS("wmi:"WMI0_EVENT_GUID); +MODULE_ALIAS("wmi:"HWMI_EVENT_GUID); MODULE_AUTHOR("Ayman Bagabas <ayman.baga...@gmail.com>"); MODULE_DESCRIPTION("Huawei WMI laptop extras driver"); MODULE_LICENSE("GPL v2"); -- 2.20.1
