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Date: Mon, 1 Mar 2021 08:28:06 -0600
From: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To: Perry Yuan <Perry.Yuan@...l.com>, pobrn@...tonmail.com,
oder_chiou@...ltek.com, perex@...ex.cz, tiwai@...e.com,
hdegoede@...hat.com, mgross@...ux.intel.com,
Mario.Limonciello@...l.com
Cc: lgirdwood@...il.com, broonie@...nel.org,
alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH v4 1/2] platform/x86: dell-privacy: Add support for Dell
hardware privacy
> diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
> index 581475f59819..18c430456de7 100644
> --- a/drivers/platform/x86/Makefile
> +++ b/drivers/platform/x86/Makefile
> @@ -51,7 +51,9 @@ obj-$(CONFIG_DELL_WMI_DESCRIPTOR) += dell-wmi-descriptor.o
> obj-$(CONFIG_DELL_WMI_AIO) += dell-wmi-aio.o
> obj-$(CONFIG_DELL_WMI_LED) += dell-wmi-led.o
> obj-$(CONFIG_DELL_WMI_SYSMAN) += dell-wmi-sysman/
> -
> +obj-$(CONFIG_DELL_PRIVACY) += dell-privacy.o
> +dell-privacy-objs := dell-privacy-wmi.o \
> + dell-privacy-acpi.o
> # Fujitsu
> obj-$(CONFIG_AMILO_RFKILL) += amilo-rfkill.o
> obj-$(CONFIG_FUJITSU_LAPTOP) += fujitsu-laptop.o
> diff --git a/drivers/platform/x86/dell-laptop.c b/drivers/platform/x86/dell-laptop.c
> index 70edc5bb3a14..ec0dcc7fc17c 100644
> --- a/drivers/platform/x86/dell-laptop.c
> +++ b/drivers/platform/x86/dell-laptop.c
> @@ -31,6 +31,8 @@
> #include "dell-rbtn.h"
> #include "dell-smbios.h"
>
> +#include "dell-privacy-wmi.h"
> +
> struct quirk_entry {
> bool touchpad_led;
> bool kbd_led_not_present;
> @@ -90,10 +92,12 @@ static struct rfkill *wifi_rfkill;
> static struct rfkill *bluetooth_rfkill;
> static struct rfkill *wwan_rfkill;
> static bool force_rfkill;
> +static bool has_privacy;
>
> module_param(force_rfkill, bool, 0444);
> MODULE_PARM_DESC(force_rfkill, "enable rfkill on non whitelisted models");
>
> +
spurious line change
> static const struct dmi_system_id dell_device_table[] __initconst = {
> {
> .ident = "Dell laptop",
> @@ -2205,11 +2209,17 @@ static int __init dell_init(void)
> dell_laptop_register_notifier(&dell_laptop_notifier);
>
> if (dell_smbios_find_token(GLOBAL_MIC_MUTE_DISABLE) &&
> - dell_smbios_find_token(GLOBAL_MIC_MUTE_ENABLE)) {
> - micmute_led_cdev.brightness = ledtrig_audio_get(LED_AUDIO_MICMUTE);
> - ret = led_classdev_register(&platform_device->dev, &micmute_led_cdev);
> - if (ret < 0)
> - goto fail_led;
> + dell_smbios_find_token(GLOBAL_MIC_MUTE_ENABLE)) {
not sure why you changed the alignment?
> + if (!privacy_valid)
> + has_privacy = true;
> + else
> + has_privacy = false;
> + if (!has_privacy) {
> + micmute_led_cdev.brightness = ledtrig_audio_get(LED_AUDIO_MICMUTE);
> + ret = led_classdev_register(&platform_device->dev, &micmute_led_cdev);
> + if (ret < 0)
> + goto fail_led;
> + }
> }
>
> if (acpi_video_get_backlight_type() != acpi_backlight_vendor)
> +static struct platform_driver dell_privacy_platform_drv = {
> + .driver = {
> + .name = PRIVACY_PLATFORM_NAME,
> + },
> + .probe = dell_privacy_acpi_probe,
> + .remove = dell_privacy_acpi_remove,
> +};
> +
> +int __init dell_privacy_acpi_init(void)
> +{
> + int err;
> + struct platform_device *pdev;
> +
> + if (!wmi_has_guid(DELL_PRIVACY_GUID))
> + return -ENODEV;
> +
> + privacy_acpi = kzalloc(sizeof(*privacy_acpi), GFP_KERNEL);
> + if (!privacy_acpi)
> + return -ENOMEM;
> +
> + err = platform_driver_register(&dell_privacy_platform_drv);
> + if (err)
> + goto pdrv_err;
> +
> + pdev = platform_device_register_simple(
> + PRIVACY_PLATFORM_NAME, PLATFORM_DEVID_NONE, NULL, 0);
> + if (IS_ERR(pdev)) {
> + err = PTR_ERR(pdev);
> + goto pdev_err;
> + }
> +
> + return 0;
> +
> +pdev_err:
> + platform_device_unregister(pdev);
> +pdrv_err:
> + kfree(privacy_acpi);
> + return err;
> +}
don't you need some sort of device_initcall() to load this module on
startup?
> +void dell_privacy_process_event(int type, int code, int status)
> +{
> + struct privacy_wmi_data *priv;
> + const struct key_entry *key;
> +
> + mutex_lock(&list_mutex);
> + priv = list_first_entry_or_null(&wmi_list,
> + struct privacy_wmi_data,
> + list);
> + if (!priv) {
> + pr_err("dell privacy priv is NULL\n");
> + goto error;
> + }
> + key = sparse_keymap_entry_from_scancode(priv->input_dev, (type << 16) | code);
> + if (!key) {
> + dev_dbg(&priv->wdev->dev, "Unknown key with type 0x%04x and code 0x%04x pressed\n",
> + type, code);
> + goto error;
> + }
> + switch (code) {
> + case DELL_PRIVACY_TYPE_AUDIO: /* Mic mute */
> + priv->last_status = status;
> + sparse_keymap_report_entry(priv->input_dev, key, 1, true);
> + break;
> + case DELL_PRIVACY_TYPE_CAMERA: /* Camera mute */
> + priv->last_status = status;
> + sparse_keymap_report_entry(priv->input_dev, key, 1, true);
> + break;
You are doing the same things twice, so group the two cases:
case DELL_PRIVACY_TYPE_AUDIO: /* Mic mute */
case DELL_PRIVACY_TYPE_CAMERA: /* Camera mute */
priv->last_status = status;
sparse_keymap_report_entry(priv->input_dev, key, 1, true);
break;
> + default:
> + dev_dbg(&priv->wdev->dev, "unknown event type 0x%04x 0x%04x",
> + type, code);
alignment?
> + }
> +error:
> + mutex_unlock(&list_mutex);
> +}
> +EXPORT_SYMBOL_GPL(dell_privacy_process_event);
> +static int dell_privacy_wmi_probe(struct wmi_device *wdev, const void *context)
> +{
> + struct privacy_wmi_data *priv;
> + struct key_entry *keymap;
> + int ret, i;
> +
> + priv = devm_kzalloc(&wdev->dev, sizeof(*priv), GFP_KERNEL);
> + if (!priv)
> + return -ENOMEM;
> +
> + dev_set_drvdata(&wdev->dev, priv);
> + priv->wdev = wdev;
> + /* create evdev passing interface */
> + priv->input_dev = devm_input_allocate_device(&wdev->dev);
> + if (!priv->input_dev)
> + return -ENOMEM;
> + /* remap the wmi keymap event to new keymap */
> + keymap = kcalloc(ARRAY_SIZE(dell_wmi_keymap_type_0012),
> + sizeof(struct key_entry), GFP_KERNEL);
> + if (!keymap) {
> + ret = -ENOMEM;
> + goto err_free_dev;
> + }
> + /* remap the keymap code with Dell privacy key type 0x12 as prefix
> + * KEY_MICMUTE scancode will be reported as 0x120001
> + */
> + for (i = 0; i < ARRAY_SIZE(dell_wmi_keymap_type_0012); i++) {
> + keymap[i] = dell_wmi_keymap_type_0012[i];
> + keymap[i].code |= (0x0012 << 16);
> + }
> + ret = sparse_keymap_setup(priv->input_dev, keymap, NULL);
> + if (ret)
> + return ret;
> + priv->input_dev->dev.parent = &wdev->dev;
> + priv->input_dev->name = "Dell Privacy Driver";
> + priv->input_dev->id.bustype = BUS_HOST;
> + if (input_register_device(priv->input_dev)) {
> + pr_debug("input_register_device failed to register!\n");
> + goto err_free_keymap;
> + }
> + mutex_lock(&list_mutex);
> + list_add_tail(&priv->list, &wmi_list);
> + mutex_unlock(&list_mutex);
> +
> + if (get_current_status(priv->wdev))
> + goto err_free_input;
> +
> + ret = devm_device_add_group(&wdev->dev, &privacy_attribute_group);
> + if (ret)
> + goto err_free_input;
> +
> + kfree(keymap);
> + return 0;
> +
> +err_free_input:
> + input_unregister_device(priv->input_dev);
> +err_free_keymap:
> + privacy_valid = -ENODEV;
> + kfree(keymap);
> +err_free_dev:
> + input_free_device(priv->input_dev);
priv->input_dev is allocated with devm_, so why do you need to do
anything with it? that seems like a miss.
> + return ret;
> +}
> +
> MODULE_AUTHOR("Matthew Garrett <mjg@...hat.com>");
> MODULE_AUTHOR("Pali Rohár <pali@...nel.org>");
> @@ -381,6 +383,7 @@ static void dell_wmi_notify(struct wmi_device *wdev,
> u16 *buffer_entry, *buffer_end;
> acpi_size buffer_size;
> int len, i;
> + int err;
>
> if (obj->type != ACPI_TYPE_BUFFER) {
> pr_warn("bad response type %x\n", obj->type);
> @@ -427,10 +430,9 @@ static void dell_wmi_notify(struct wmi_device *wdev,
>
> switch (buffer_entry[1]) {
> case 0x0000: /* One key pressed or event occurred */
> - case 0x0012: /* Event with extended data occurred */
> if (len > 2)
> dell_wmi_process_key(wdev, buffer_entry[1],
> - buffer_entry[2]);
> + buffer_entry[2]);
keep the alignment?
> /* Extended data is currently ignored */
> break;
> case 0x0010: /* Sequence of keys pressed */
> @@ -439,6 +441,17 @@ static void dell_wmi_notify(struct wmi_device *wdev,
> dell_wmi_process_key(wdev, buffer_entry[1],
> buffer_entry[i]);
> break;
> + case 0x0012:
> + err = dell_privacy_state();
> + if (err == 0) {
> + dell_privacy_process_event(buffer_entry[1],
> + buffer_entry[3], buffer_entry[4]);
> + } else {
> + if (len > 2)
> + dell_wmi_process_key(wdev, buffer_entry[1],
> + buffer_entry[2]);
> + }
> + break;
> default: /* Unknown event */
> pr_info("Unknown WMI event type 0x%x\n",
> (int)buffer_entry[1]);
>
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