On Sun, Mar 27, 2016 at 12:05:27AM +0000, sergk sergk2mail wrote: > Hi Mika, Benjamin, Antonio. > Kindly would like to invite all of you to this thread because it is > very closely to http://www.spinics.net/lists/linux-input/msg35935.html > : About Goodix-TS on Bay Trail, and ACPI and interrupts > Let me briefly summarize: > 1) I have wrote driver that loads FW into the TS chip (icn8228), I am > able to get polling mode, primary task at the moment is - to setup IRQ > mode. > 2) No ACPI, but at the moment I do not take care because just taken > and guessed all info and passed it hardcoded in my prototype of the > chipone driver. - later I will back to ACPI moment or if it is not > possible to setup IRQ in 1) without 2 - priorities will be changed. > > DSDT for chipone icn8528 on Chuwi Vi10 (Baytrail Z3736F) is > here:http://www.spinics.net/lists/linux-i2c/msg23520.html It claims to be I2C-HID compatible device so I think it should just use i2c-hid.c which should handle setting up interrupt automatically. Not sure about loading the firmware but I suppose it is the job of the higher level HID driver who knows the details. > Please assists with in setuping IRQ mode for TS driver, possible IRQ > is gpio based. > What I have obtained from Android: SB_GPO1 : gpio base 102 - > this > means that gpio controller is used! > Looking for corresponding gpiochip inside Linux 4.2.2 kernel: I have > discovered suitable (the same amount of ngpio) this one: chip382, > label: INT33FC:01. > Also guessing (enumerating all) gpios via userspace kernel interface > I have discovered that gpios: 393 and 391,392 - blank off/on > touchscreen by setting /sys/class/gpio39X/value to 0/1. > > Here is my draft debug code of the driver prototype for Chipone > icn8528 and irq NOT setuped at the moment :(. > I think it should be gpio based, in Android it is so: cat /proc/interrupts > > 389 29 3 0 0 VLV-GPIO-gpio icn85xx_ts. > > Inside my code irq setuping: > IRQ begin: > https://gitlab.com/SergK/icn8528/blob/master/myicn.c#L1393 > > icn85xx_request_irq > https://gitlab.com/SergK/icn8528/blob/master/myicn.c#L993 In order to use GPIO as interrupt you need to first request and configure it like: struct gpio_desc *desc; int irq; desc = gpiod_get(dev, NULL, GPIOD_IN); irq = gpiod_to_irq(desc); request_irq(irq, ...); But in you case, looking at the DSDT there is one Interrupt() resource below the TCS5 device. That should be handled automatically by the I2C core and filled in client->irq. -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
