Re: [PATCH] Input: i8042 - Add support for platform filter contexts

From: Ilpo Järvinen
Date: Mon Dec 16 2024 - 10:38:06 EST

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On Mon, 16 Dec 2024, Armin Wolf wrote:

> Currently the platform filter cannot access any driver-specific state
> which forces drivers installing a i8042 filter to have at least some
> kind of global pointer for their filter.
>
> This however might cause issues should such a driver probe multiple
> devices. Fix this by allowing callers of i8042_install_filter() to
> submit a context pointer which is then passed to the i8042 filter.
>
> Also introduce a separate type for the i8042 filter (i8042_filter_t)
> so that the function definitions can stay compact.
>
> Tested on a Dell Inspiron 3505.
>
> Signed-off-by: Armin Wolf <W_Armin@xxxxxx>
> ---
> Since most of the affected drivers are x86 platform drivers, i would
> like to have this changes merged through the platform-drivers-x86
> tree. This would also prevent a possible merge conflict should
> the samsung-galaxybook driver get merged.
> ---
> drivers/input/misc/ideapad_slidebar.c | 4 ++--
> drivers/input/serio/i8042.c | 17 ++++++++++-------
> drivers/platform/x86/asus-nb-wmi.c | 3 ++-
> drivers/platform/x86/asus-wmi.c | 2 +-
> drivers/platform/x86/asus-wmi.h | 3 +--
> drivers/platform/x86/dell/dell-laptop.c | 6 +++---
> drivers/platform/x86/hp/hp_accel.c | 4 ++--
> drivers/platform/x86/msi-laptop.c | 6 +++---
> drivers/platform/x86/panasonic-laptop.c | 4 ++--
> drivers/platform/x86/toshiba_acpi.c | 4 ++--
> include/linux/i8042.h | 15 +++++++--------
> 11 files changed, 35 insertions(+), 33 deletions(-)
>
> diff --git a/drivers/input/misc/ideapad_slidebar.c b/drivers/input/misc/ideapad_slidebar.c
> index f6e5fc807b4d..ab2e0a401904 100644
> --- a/drivers/input/misc/ideapad_slidebar.c
> +++ b/drivers/input/misc/ideapad_slidebar.c
> @@ -121,7 +121,7 @@ static void slidebar_mode_set(u8 mode)
> }
>
> static bool slidebar_i8042_filter(unsigned char data, unsigned char str,
> - struct serio *port)
> + struct serio *port, void *context)
> {
> static bool extended = false;
>
> @@ -219,7 +219,7 @@ static int __init ideapad_probe(struct platform_device* pdev)
> input_set_capability(slidebar_input_dev, EV_ABS, ABS_X);
> input_set_abs_params(slidebar_input_dev, ABS_X, 0, 0xff, 0, 0);
>
> - err = i8042_install_filter(slidebar_i8042_filter);
> + err = i8042_install_filter(slidebar_i8042_filter, NULL);
> if (err) {
> dev_err(&pdev->dev,
> "Failed to install i8042 filter: %d\n", err);
> diff --git a/drivers/input/serio/i8042.c b/drivers/input/serio/i8042.c
> index 509330a27880..cab5a4c5baf5 100644
> --- a/drivers/input/serio/i8042.c
> +++ b/drivers/input/serio/i8042.c
> @@ -179,8 +179,8 @@ static struct platform_device *i8042_platform_device;
> static struct notifier_block i8042_kbd_bind_notifier_block;
>
> static bool i8042_handle_data(int irq);
> -static bool (*i8042_platform_filter)(unsigned char data, unsigned char str,
> - struct serio *serio);
> +static i8042_filter_t i8042_platform_filter;
> +static void *i8042_platform_filter_context;
>
> void i8042_lock_chip(void)
> {
> @@ -194,8 +194,7 @@ void i8042_unlock_chip(void)
> }
> EXPORT_SYMBOL(i8042_unlock_chip);
>
> -int i8042_install_filter(bool (*filter)(unsigned char data, unsigned char str,
> - struct serio *serio))
> +int i8042_install_filter(i8042_filter_t filter, void *context)
> {
> guard(spinlock_irqsave)(&i8042_lock);
>
> @@ -203,12 +202,12 @@ int i8042_install_filter(bool (*filter)(unsigned char data, unsigned char str,
> return -EBUSY;
>
> i8042_platform_filter = filter;
> + i8042_platform_filter_context = context;
> return 0;
> }
> EXPORT_SYMBOL(i8042_install_filter);
>
> -int i8042_remove_filter(bool (*filter)(unsigned char data, unsigned char str,
> - struct serio *port))
> +int i8042_remove_filter(i8042_filter_t filter)
> {
> guard(spinlock_irqsave)(&i8042_lock);
>
> @@ -216,6 +215,7 @@ int i8042_remove_filter(bool (*filter)(unsigned char data, unsigned char str,
> return -EINVAL;
>
> i8042_platform_filter = NULL;
> + i8042_platform_filter_context = NULL;
> return 0;
> }
> EXPORT_SYMBOL(i8042_remove_filter);
> @@ -480,7 +480,10 @@ static bool i8042_filter(unsigned char data, unsigned char str,
> }
> }
>
> - if (i8042_platform_filter && i8042_platform_filter(data, str, serio)) {
> + if (!i8042_platform_filter)
> + return false;
> +
> + if (i8042_platform_filter(data, str, serio, i8042_platform_filter_context)) {
> dbg("Filtered out by platform filter\n");
> return true;
> }
> diff --git a/drivers/platform/x86/asus-nb-wmi.c b/drivers/platform/x86/asus-nb-wmi.c
> index ef04d396f61c..a3d4b98045f8 100644
> --- a/drivers/platform/x86/asus-nb-wmi.c
> +++ b/drivers/platform/x86/asus-nb-wmi.c
> @@ -50,7 +50,8 @@ MODULE_PARM_DESC(tablet_mode_sw, "Tablet mode detect: -1:auto 0:disable 1:kbd-do
> static struct quirk_entry *quirks;
> static bool atkbd_reports_vol_keys;
>
> -static bool asus_i8042_filter(unsigned char data, unsigned char str, struct serio *port)
> +static bool asus_i8042_filter(unsigned char data, unsigned char str, struct serio *port,
> + void *context)
> {
> static bool extended_e0;
> static bool extended_e1;
> diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
> index fdeebab96fc0..6c674de60ec0 100644
> --- a/drivers/platform/x86/asus-wmi.c
> +++ b/drivers/platform/x86/asus-wmi.c
> @@ -4824,7 +4824,7 @@ static int asus_wmi_add(struct platform_device *pdev)
> }
>
> if (asus->driver->i8042_filter) {
> - err = i8042_install_filter(asus->driver->i8042_filter);
> + err = i8042_install_filter(asus->driver->i8042_filter, NULL);
> if (err)
> pr_warn("Unable to install key filter - %d\n", err);
> }
> diff --git a/drivers/platform/x86/asus-wmi.h b/drivers/platform/x86/asus-wmi.h
> index d02f15fd3482..018dfde4025e 100644
> --- a/drivers/platform/x86/asus-wmi.h
> +++ b/drivers/platform/x86/asus-wmi.h
> @@ -73,8 +73,7 @@ struct asus_wmi_driver {
> void (*key_filter) (struct asus_wmi_driver *driver, int *code,
> unsigned int *value, bool *autorelease);
> /* Optional standard i8042 filter */
> - bool (*i8042_filter)(unsigned char data, unsigned char str,
> - struct serio *serio);
> + i8042_filter_t i8042_filter;
>
> int (*probe) (struct platform_device *device);
> void (*detect_quirks) (struct asus_wmi_driver *driver);
> diff --git a/drivers/platform/x86/dell/dell-laptop.c b/drivers/platform/x86/dell/dell-laptop.c
> index 5671bd0deee7..58b860b88fff 100644
> --- a/drivers/platform/x86/dell/dell-laptop.c
> +++ b/drivers/platform/x86/dell/dell-laptop.c
> @@ -725,8 +725,8 @@ static void dell_update_rfkill(struct work_struct *ignored)
> }
> static DECLARE_DELAYED_WORK(dell_rfkill_work, dell_update_rfkill);
>
> -static bool dell_laptop_i8042_filter(unsigned char data, unsigned char str,
> - struct serio *port)
> +static bool dell_laptop_i8042_filter(unsigned char data, unsigned char str, struct serio *port,
> + void *context)
> {
> static bool extended;
>
> @@ -884,7 +884,7 @@ static int __init dell_setup_rfkill(void)
> pr_warn("Unable to register dell rbtn notifier\n");
> goto err_filter;
> } else {
> - ret = i8042_install_filter(dell_laptop_i8042_filter);
> + ret = i8042_install_filter(dell_laptop_i8042_filter, NULL);
> if (ret) {
> pr_warn("Unable to install key filter\n");
> goto err_filter;
> diff --git a/drivers/platform/x86/hp/hp_accel.c b/drivers/platform/x86/hp/hp_accel.c
> index 39a6530f5072..10d5af18d639 100644
> --- a/drivers/platform/x86/hp/hp_accel.c
> +++ b/drivers/platform/x86/hp/hp_accel.c
> @@ -267,7 +267,7 @@ static struct delayed_led_classdev hpled_led = {
> };
>
> static bool hp_accel_i8042_filter(unsigned char data, unsigned char str,
> - struct serio *port)
> + struct serio *port, void *context)
> {
> static bool extended;
>
> @@ -326,7 +326,7 @@ static int lis3lv02d_probe(struct platform_device *device)
> /* filter to remove HPQ6000 accelerometer data
> * from keyboard bus stream */
> if (strstr(dev_name(&device->dev), "HPQ6000"))
> - i8042_install_filter(hp_accel_i8042_filter);
> + i8042_install_filter(hp_accel_i8042_filter, NULL);
>
> INIT_WORK(&hpled_led.work, delayed_set_status_worker);
> ret = led_classdev_register(NULL, &hpled_led.led_classdev);
> diff --git a/drivers/platform/x86/msi-laptop.c b/drivers/platform/x86/msi-laptop.c
> index e5391a37014d..c4b150fa093f 100644
> --- a/drivers/platform/x86/msi-laptop.c
> +++ b/drivers/platform/x86/msi-laptop.c
> @@ -806,8 +806,8 @@ static void msi_send_touchpad_key(struct work_struct *ignored)
> }
> static DECLARE_DELAYED_WORK(msi_touchpad_dwork, msi_send_touchpad_key);
>
> -static bool msi_laptop_i8042_filter(unsigned char data, unsigned char str,
> - struct serio *port)
> +static bool msi_laptop_i8042_filter(unsigned char data, unsigned char str, struct serio *port,
> + void *context)
> {
> static bool extended;
>
> @@ -996,7 +996,7 @@ static int __init load_scm_model_init(struct platform_device *sdev)
> if (result)
> goto fail_input;
>
> - result = i8042_install_filter(msi_laptop_i8042_filter);
> + result = i8042_install_filter(msi_laptop_i8042_filter, NULL);
> if (result) {
> pr_err("Unable to install key filter\n");
> goto fail_filter;
> diff --git a/drivers/platform/x86/panasonic-laptop.c b/drivers/platform/x86/panasonic-laptop.c
> index 22ca70eb8227..2987b4db6009 100644
> --- a/drivers/platform/x86/panasonic-laptop.c
> +++ b/drivers/platform/x86/panasonic-laptop.c
> @@ -260,7 +260,7 @@ struct pcc_acpi {
> * keypress events over the PS/2 kbd interface, filter these out.
> */
> static bool panasonic_i8042_filter(unsigned char data, unsigned char str,
> - struct serio *port)
> + struct serio *port, void *context)
> {
> static bool extended;
>
> @@ -1100,7 +1100,7 @@ static int acpi_pcc_hotkey_add(struct acpi_device *device)
> pcc->platform = NULL;
> }
>
> - i8042_install_filter(panasonic_i8042_filter);
> + i8042_install_filter(panasonic_i8042_filter, NULL);
> return 0;
>
> out_platform:
> diff --git a/drivers/platform/x86/toshiba_acpi.c b/drivers/platform/x86/toshiba_acpi.c
> index 78a5aac2dcfd..5ad3a7183d33 100644
> --- a/drivers/platform/x86/toshiba_acpi.c
> +++ b/drivers/platform/x86/toshiba_acpi.c
> @@ -2755,7 +2755,7 @@ static int toshiba_acpi_enable_hotkeys(struct toshiba_acpi_dev *dev)
> }
>
> static bool toshiba_acpi_i8042_filter(unsigned char data, unsigned char str,
> - struct serio *port)
> + struct serio *port, void *context)
> {
> if (str & I8042_STR_AUXDATA)
> return false;
> @@ -2915,7 +2915,7 @@ static int toshiba_acpi_setup_keyboard(struct toshiba_acpi_dev *dev)
> if (ec_handle && acpi_has_method(ec_handle, "NTFY")) {
> INIT_WORK(&dev->hotkey_work, toshiba_acpi_hotkey_work);
>
> - error = i8042_install_filter(toshiba_acpi_i8042_filter);
> + error = i8042_install_filter(toshiba_acpi_i8042_filter, NULL);
> if (error) {
> pr_err("Error installing key filter\n");
> goto err_free_dev;
> diff --git a/include/linux/i8042.h b/include/linux/i8042.h
> index 95b07f8b77fe..be9460c874d6 100644
> --- a/include/linux/i8042.h
> +++ b/include/linux/i8042.h
> @@ -54,15 +54,16 @@
>
> struct serio;
>
> +typedef bool (*i8042_filter_t)(unsigned char data, unsigned char str, struct serio *serio,
> + void *context);
> +

Could you please add the kerneldoc for the typedef.

Other than that, the change seems good.

Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>

--
i.

> #if defined(CONFIG_SERIO_I8042) || defined(CONFIG_SERIO_I8042_MODULE)
>
> void i8042_lock_chip(void);
> void i8042_unlock_chip(void);
> int i8042_command(unsigned char *param, int command);
> -int i8042_install_filter(bool (*filter)(unsigned char data, unsigned char str,
> - struct serio *serio));
> -int i8042_remove_filter(bool (*filter)(unsigned char data, unsigned char str,
> - struct serio *serio));
> +int i8042_install_filter(i8042_filter_t filter, void *context);
> +int i8042_remove_filter(i8042_filter_t filter);
>
> #else
>
> @@ -79,14 +80,12 @@ static inline int i8042_command(unsigned char *param, int command)
> return -ENODEV;
> }
>
> -static inline int i8042_install_filter(bool (*filter)(unsigned char data, unsigned char str,
> - struct serio *serio))
> +static inline int i8042_install_filter(i8042_filter_t filter, void *context)
> {
> return -ENODEV;
> }
>
> -static inline int i8042_remove_filter(bool (*filter)(unsigned char data, unsigned char str,
> - struct serio *serio))
> +static inline int i8042_remove_filter(i8042_filter_t filter)
> {
> return -ENODEV;
> }
> --
> 2.39.5
>

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