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I get this error when inserting the module:
silead_ts i2c-MSSL1680:00: Initialization error, status: 0x0

What am I doing wrong? I copied /lib/firmware/silead_ts.fw (from gslx680) to /lib/firmware/mssl1680.fw. Could there be a problem with the firmware?

I have tried your driver with a surftab wintron 7.0 tablet from TrekStor. I have used the firmware file mentioned in this thread which is directly from TrekStore: http://download.trekstor.de/tl_files/userFiles/products/surftab_wintron_70_v2/PG-HK70DR2503.zip
This is exactly the device I have.
I got the following messages on insmod:

  silead_ts i2c-MSSL1680:00: firmware: direct-loading firmware mssl1680.fw
  input: silead_ts as /devices/platform/80860F41:03/i2c-3/i2c-MSSL1680:00/input/input4
  silead_ts i2c-MSSL1680:00: IRQ request failed -4
  silead_ts: probe of i2c-MSSL1680:00 failed with error -4

EDIT: I tried it again and it brought an initialization error because it hung more than 120 seconds.
I'm getting the following message silead_ts i2c-MSSL1680:00 Initialization error, status 0x0.

I have Viglen Connect 8.9" so I used firmware/viglen/connect10/firmware.fw from this repo https://github.com/onitake/gsl-firmware.git

sudo cp firmware/viglen/connect10/firmware.fw /usr/lib/firmware/mssl1680.fw 
sudo modprobe silead

Dmesg says:

[  996.989469] silead_ts i2c-MSSL1680:00: firmware: direct-loading firmware mssl1680.fw
[  999.389516] input: silead_ts as /devices/platform/80860F41:03/i2c-3/i2c-MSSL1680:00/input/input10

And xinput sees that device:

⎡ Virtual core pointer                          id=2    [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                id=4    [slave  pointer  (2)]
⎜   ↳ silead_ts                                 id=8    [slave  pointer  (2)]
⎣ Virtual core keyboard                         id=3    [master keyboard (2)]
    ↳ Virtual core XTEST keyboard               id=5    [slave  keyboard (3)]
    ↳ Video Bus                                 id=6    [slave  keyboard (3)]
    ↳ bytcr-rt5640 Headset                      id=7    [slave  keyboard (3)]
    ↳ axp20x-pek                                id=9    [slave  keyboard (3)]
    ↳ gpio-keys                                 id=10   [slave  keyboard (3)]
    ↳ gpio-keys                                 id=11   [slave  keyboard (3)]

More info:
uname -a: Linux kali 5.14.0-kali4-amd64 #1 SMP Debian 5.14.16-1kali1 (2021-11-05) x86_64 GNU/Linux

But touch does not work. Is there a problem with firmware for connect10 (not compatible with Connect 8.9)?

The patch from the LKML still has a few bugs.

Here's a fix for the swapped devm_gpiod_get_index parameters:

---------------------- drivers/input/touchscreen/silead.c ----------------------
index 7c97852..fed9cad 100644
@@ -531,7 +531,7 @@ static int silead_ts_probe(struct i2c_client *client,

    /* Power GPIO pin */
    data->gpio_power = devm_gpiod_get_index(dev, SILEAD_PWR_GPIO_NAME,
-                       GPIOD_OUT_LOW, 1);
+                       1, GPIOD_OUT_LOW);
    if (IS_ERR(data->gpio_power)) {
        dev_dbg(dev, "Shutdown GPIO request failed\n");
        data->gpio_power = NULL;

what mean ? what hid.fw ? what “ [hid] with the HID ID of your device” ?

Hello,

with silead kernel driver I can choose menu item - for example I press File, File menu opens, but when I try to choose any submenu - New, Open, Quit, nothing happens. In any app.

When I build this driver with kernel version 3.14.19, some errors occured:
[ 179s] drivers/input/touchscreen/silead.c: In function 'silead_ts_read_data':
[ 179s] drivers/input/touchscreen/silead.c:210:3: error: too many arguments to function 'input_mt_assign_slots'
[ 179s] input_mt_assign_slots(data->input, data->slots, data->pos,
[ 179s] ^
[ 179s] In file included from drivers/input/touchscreen/silead.c:27:0:
[ 179s] include/linux/input/mt.h:120:5: note: declared here
[ 179s] int input_mt_assign_slots(struct input_dev dev, int *slots,
[ 179s] ^
[ 179s] drivers/input/touchscreen/silead.c: In function 'silead_ts_read_props':
[ 179s] drivers/input/touchscreen/silead.c:432:2: error: implicit declaration of function 'device_property_read_u16' [-Werror=implicit-function-declaration]
[ 179s] error = device_property_read_u16(dev, SILEAD_DP_X_MAX, &data->x_max);
[ 179s] ^
[ 179s] drivers/input/touchscreen/silead.c:444:2: error: implicit declaration of function 'device_property_read_u8' [-Werror=implicit-function-declaration]
[ 179s] error = device_property_read_u8(dev, SILEAD_DP_MAX_FINGERS,
[ 179s] ^
[ 179s] drivers/input/touchscreen/silead.c:451:2: error: implicit declaration of function 'device_property_read_string' [-Werror=implicit-function-declaration]
[ 179s] error = device_property_read_string(dev, SILEAD_DP_FW_NAME,
[ 179s] ^
[ 179s] drivers/input/touchscreen/silead.c:456:2: error: implicit declaration of function 'device_property_read_bool' [-Werror=implicit-function-declaration]
[ 179s] data->x_invert = device_property_read_bool(dev, SILEAD_DP_X_INVERT);
[ 179s] ^
[ 179s] drivers/input/touchscreen/silead.c: In function 'silead_ts_probe':
[ 179s] drivers/input/touchscreen/silead.c:534:7: error: 'GPIOD_OUT_LOW' undeclared (first use in this function)
[ 179s] GPIOD_OUT_LOW, 1);
[ 179s] ^
[ 179s] drivers/input/touchscreen/silead.c:534:7: note: each undeclared identifier is reported only once for each function it appears in
[ 179s] drivers/input/touchscreen/silead.c:533:21: error: too many arguments to function 'devm_gpiod_get_index'
[ 179s] data->gpio_power = devm_gpiod_get_index(dev, SILEAD_PWR_GPIO_NAME,
[ 179s] ^
[ 179s] In file included from drivers/input/touchscreen/silead.c:23:0:
[ 179s] include/linux/gpio/consumer.h:31:32: note: declared here
[ 179s] struct gpio_desc *__must_check devm_gpiod_get_index(struct device *dev,
[ 179s] ^
[ 179s] cc1: some warnings being treated as errors
[ 179s] scripts/Makefile.build:308: recipe for target 'drivers/input/touchscreen/silead.o' failed
[ 179s] make[3]: ** [drivers/input/touchscreen/silead.o] Error 1
[ 179s] scripts/Makefile.build:455: recipe for target 'drivers/input/touchscreen' failed
[ 179s] make[2]: *** [drivers/input/touchscreen] Error 2
[ 179s] scripts/Makefile.build:455: recipe for target 'drivers/input' failed
[ 179s] make[1]: *** [drivers/input] Error 2
[ 179s] make[1]: *** Waiting for unfinished jobs....

Is this kernel version to old?