make doesn't work on ubunt 20.04 kernel 5.11

dirty hack - forget the polling mode and use IRQ only:
diff --git a/i2c-hid_standalone/i2c-hid-core.c b/i2c-hid_standalone/i2c-hid-core.c
index f25503f..e663863 100644
--- a/i2c-hid_standalone/i2c-hid-core.c
+++ b/i2c-hid_standalone/i2c-hid-core.c
@@ -841,96 +841,17 @@ struct hid_ll_driver i2c_hid_ll_driver = {
 };
 EXPORT_SYMBOL_GPL(i2c_hid_ll_driver);

-static int get_gpio_pin_state(struct irq_desc *irq_desc)
-{
-   struct gpio_chip *gc = irq_data_get_irq_chip_data(&irq_desc->irq_data);
-   int value;
-
-   /*
-    * This part of code is borrowed from gpiod_get_raw_value_commit in
-    * drivers/gpio/gpiolib.c. Ideally, gpiod_get_value_cansleep can be re-used
-    * instead but there is no API of converting (struct irq_desc *) to
-    * (struct gpio_desc*).
-    */
-   value = gc->get ? gc->get(gc, irq_desc->irq_data.hwirq) : -EIO;
-   value = value < 0 ? value : !!value;
-   return value;
-}
-
-static bool interrupt_line_active(struct i2c_hid *ihid)
-{
-   int status = get_gpio_pin_state(ihid->irq_desc);
-   struct i2c_client *client = ihid->client;
-
-   if (status < 0) {
-       dev_dbg_ratelimited(&client->dev,
-                   "Failed to get GPIO Interrupt line status for %s",
-                   client->name);
-       return false;
-   }
-   /*
-    * According to Windows Precsiontion Touchpad's specs
-    * https://docs.microsoft.com/en-us/windows-hardware/design/component-guidelines/windows-precision-touchpad-device-bus-connectivity,
-    * GPIO Interrupt Assertion Leve could be either ActiveLow or
-    * ActiveHigh.
-    */
-   if (ihid->irq_trigger_type & IRQF_TRIGGER_LOW)
-       return !status;
-
-   return status;
-}
-
-static int i2c_hid_polling_thread(void *i2c_hid)
-{
-   struct i2c_hid *ihid = i2c_hid;
-   unsigned int polling_interval_idle;
-
-   while (!kthread_should_stop()) {
-       while (interrupt_line_active(i2c_hid) &&
-              !test_bit(I2C_HID_READ_PENDING, &ihid->flags) &&
-              !kthread_should_stop()) {
-           i2c_hid_get_input(ihid);
-           usleep_range(polling_interval_active_us,
-                    polling_interval_active_us + 100);
-       }
-       /*
-        * re-calculate polling_interval_idle
-        * so the module parameters polling_interval_idle_ms can be
-        * changed dynamically through sysfs as polling_interval_active_us
-        */
-       polling_interval_idle = polling_interval_idle_ms * 1000;
-       usleep_range(polling_interval_idle,
-                polling_interval_idle + 1000);
-   }
-
-   return 0;
-}
-
 static int i2c_hid_init_polling(struct i2c_hid *ihid)
 {
    struct i2c_client *client = ihid->client;

-   ihid->irq_trigger_type = irq_get_trigger_type(client->irq);
-   if (!ihid->irq_trigger_type) {
-       dev_dbg(&client->dev,
-           "Failed to get GPIO Interrupt Assertion Level, could not enable polling mode for %s",
-            client->name);
-       return -EINVAL;
-   }
-
-   ihid->polling_thread = kthread_create(i2c_hid_polling_thread, ihid,
-                         "I2C HID polling thread");
-
-   if (IS_ERR(ihid->polling_thread)) {
-       dev_err(&client->dev, "Failed to create I2C HID polling thread");
-       return PTR_ERR(ihid->polling_thread);
-   }
-
-   ihid->irq_desc = irq_to_desc(client->irq);
-   wake_up_process(ihid->polling_thread);
-   return 0;
+   dev_dbg(&client->dev,
+       "Could not enable polling mode for %s",
+        client->name);
+   return -EINVAL;
 }

+
 static int i2c_hid_init_irq(struct i2c_client *client)
 {
    struct i2c_hid *ihid = i2c_get_clientdata(client);
coiby / standalone_i2c_hid

make doesn't work on ubunt 20.04 kernel 5.11 #6
