Input: tm2-touchkey - allow changing keycodes from userspace

At the moment the touch keys have key codes assigned from the device
tree. In some cases, users might want to change the key code from
userspace. There is existing functionality for this in the input core
using the EVIOCSKEYCODE ioctl, which is integrated for example into udev.

Make it possible to use this functionality for tm2-touchkey by simply
making the input core aware of the array that holds the keycodes.
Similar code also exists in mcs_touchkey and mpr121_touchkey.

Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Link: https://lore.kernel.org/r/20211013112305.41574-2-stephan@gerhold.net
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --git a/drivers/input/keyboard/tm2-touchkey.c b/drivers/input/keyboard/tm2-touchkey.c
index ce40ea2d940fccc3482907658c6fce9b7086ce97..632cd6c1c8d4d0d48aad5e8c927922eb310fb566 100644 (file)
--- a/drivers/input/keyboard/tm2-touchkey.c
+++ b/drivers/input/keyboard/tm2-touchkey.c
@@ -252,6 +252,10 @@ static int tm2_touchkey_probe(struct i2c_client *client,
        touchkey->input_dev->name = TM2_TOUCHKEY_DEV_NAME;
        touchkey->input_dev->id.bustype = BUS_I2C;
 
+       touchkey->input_dev->keycode = touchkey->keycodes;
+       touchkey->input_dev->keycodemax = touchkey->num_keycodes;
+       touchkey->input_dev->keycodesize = sizeof(touchkey->keycodes[0]);
+
        input_set_capability(touchkey->input_dev, EV_MSC, MSC_SCAN);
        for (i = 0; i < touchkey->num_keycodes; i++)
                input_set_capability(touchkey->input_dev, EV_KEY,