Hi,
I’m developing a HID device which uses I2C bus. I have connected this device to I2C-2 bus on the BeagleBone Black. I can read registers with i2cdump, so the I2C connection is fine.
My device signals changes with an interrupt. The interrupt pin is connected to GPIO_49 (P9_23) on the BBB. I need to write a kernel module and I have started with device tree overlay.
My dts file is:
/dts-v1/;
/plugin/;
/ {
compatible = "ti,beaglebone", "ti,beaglebone-black";
part-number = "BB-I2C2-SLIDER";
version = "00A0";
fragment@0 {
target = <&i2c2>;
__overlay__ {
slider: slider@68 {
compatible = "ei,slider";
#address-cells = <0x1>;
#size-cells = <0>;
reg = <0x68>;
interrupt-parent = <&gpio2>;
interrupts = <49 1>;
};
};
};
};
The probe function in the kernel module is:
static int slider_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
struct slider_device *slider;
int ret;
slider = devm_kzalloc(&client->dev, sizeof(*slider), GFP_KERNEL);
if (!slider)
return -ENOMEM;
slider->client = client;
slider->irq = client->irq;
ret = request_irq(slider->irq, slider_irq_handler, IRQF_TRIGGER_RISING, "slider_iqr", 0);
if (ret) {
dev_err(&client->dev, "Failed to request IRQ\n");
return ret;
}
i2c_set_clientdata(client, slider);
dev_info(&client->dev, "Slider device probed\n");
return 0;
}
But when I try to load the module I got:
[ 67.850464] ------------[ cut here ]------------
[ 67.855431] WARNING: CPU: 0 PID: 1145 at kernel/irq/irqdomain.c:525 irq_domain_associate+0x16c/0x1e8
[ 67.867662] error: hwirq 0x31 is too large for :ocp:interconnect@48000000:segment@100000:target-module@ac000:gpio@0
[ 67.879774] Modules linked in: ei_i2cdriver(O+) pru_rproc irq_pruss_intc pm33xx pruss pvrsrvkm(O) ti_eqep counter c_can_platform c_can can_dev evdev wkup_m3_ipc uio_pdrv_genirq uio cpufreq_dt spidev
[ 67.899421] CPU: 0 PID: 1145 Comm: insmod Tainted: G O 5.10.168-ti-r71 #1bullseye
[ 67.908261] Hardware name: Generic AM33XX (Flattened Device Tree)
[ 67.914421] [<c0110e08>] (unwind_backtrace) from [<c010c058>] (show_stack+0x10/0x14)
[ 67.922215] [<c010c058>] (show_stack) from [<c0eed268>] (dump_stack+0x88/0x9c)
[ 67.929477] [<c0eed268>] (dump_stack) from [<c013b964>] (__warn+0x88/0x128)
[ 67.936475] [<c013b964>] (__warn) from [<c0ee39a8>] (warn_slowpath_fmt+0x78/0xac)
[ 67.944007] [<c0ee39a8>] (warn_slowpath_fmt) from [<c01b6ea0>] (irq_domain_associate+0x16c/0x1e8)
[ 67.952928] [<c01b6ea0>] (irq_domain_associate) from [<c01b78c0>] (irq_create_mapping_affinity+0x148/0x1dc)
[ 67.962717] [<c01b78c0>] (irq_create_mapping_affinity) from [<c01b8704>] (irq_create_fwspec_mapping+0x1f8/0x348)
[ 67.972941] [<c01b8704>] (irq_create_fwspec_mapping) from [<c01b88a4>] (irq_create_of_mapping+0x50/0x78)
[ 67.982470] [<c01b88a4>] (irq_create_of_mapping) from [<c0c8e290>] (of_irq_get+0x84/0xc0)
[ 67.990698] [<c0c8e290>] (of_irq_get) from [<c0ba2228>] (i2c_device_probe+0x150/0x2d0)
[ 67.998664] [<c0ba2228>] (i2c_device_probe) from [<c09e0040>] (really_probe+0xf8/0x4e4)
[ 68.006711] [<c09e0040>] (really_probe) from [<c09e0868>] (driver_probe_device+0xf4/0x1c8)
[ 68.015017] [<c09e0868>] (driver_probe_device) from [<c09e0c18>] (device_driver_attach+0xa8/0xb0)
[ 68.023933] [<c09e0c18>] (device_driver_attach) from [<c09e0cc4>] (__driver_attach+0xa4/0x138)
[ 68.032586] [<c09e0cc4>] (__driver_attach) from [<c09ddc28>] (bus_for_each_dev+0x74/0xc0)
[ 68.040804] [<c09ddc28>] (bus_for_each_dev) from [<c09df274>] (bus_add_driver+0x114/0x208)
[ 68.049109] [<c09df274>] (bus_add_driver) from [<c09e184c>] (driver_register+0x88/0x118)
[ 68.057240] [<c09e184c>] (driver_register) from [<c0ba18f8>] (i2c_register_driver+0x40/0xc0)
[ 68.065724] [<c0ba18f8>] (i2c_register_driver) from [<c0102170>] (do_one_initcall+0x40/0x2cc)
[ 68.074300] [<c0102170>] (do_one_initcall) from [<c01f4f40>] (do_init_module+0x44/0x254)
[ 68.082433] [<c01f4f40>] (do_init_module) from [<c01f7b40>] (sys_finit_module+0xbc/0x120)
[ 68.090651] [<c01f7b40>] (sys_finit_module) from [<c0100060>] (ret_fast_syscall+0x0/0x54)
[ 68.098865] Exception stack(0xc2869fa8 to 0xc2869ff0)
[ 68.103943] 9fa0: 00000000 00000002 00000003 004b62d0 00000000 00000001
[ 68.112159] 9fc0: 00000000 00000002 8e8ff200 0000017b 012a41d0 00000000 00000002 be870c74
[ 68.120374] 9fe0: be870a98 be870a88 004aeb0d b6d20932
[ 68.132425] ---[ end trace 2367cdcb0efedf5e ]---
[ 68.145408] slider 2-0068: Failed to request IRQ
[ 68.158996] slider: probe of 2-0068 failed with error -22
There is no problem if I comment the request_irq function and the module works fine (of course without interrupt handler).
I believe the problem lays in the device tree description of the interrupt. I tried different options with a few other GPIOs, interrupt controllers and still haven’t found any solution. Does anyone know what I’m doing wrong?