Date: Mon, 22 Sep 2025 08:38:16 GMT From: Vladimir Kondratyev <wulf@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: a9227954b0f0 - main - ietp(4): Always overload HID report descriptor Message-ID: <202509220838.58M8cG9E006113@gitrepo.freebsd.org>
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The branch main has been updated by wulf: URL: https://cgit.FreeBSD.org/src/commit/?id=a9227954b0f01e950cc51d744af27585778ddf84 commit a9227954b0f01e950cc51d744af27585778ddf84 Author: Vladimir Kondratyev <wulf@FreeBSD.org> AuthorDate: 2025-09-22 08:37:19 +0000 Commit: Vladimir Kondratyev <wulf@FreeBSD.org> CommitDate: 2025-09-22 08:37:19 +0000 ietp(4): Always overload HID report descriptor It is required since "iichid(4): Always use wMaxInputLength bytes as input report length" commit. MFC after: 1 week --- sys/dev/hid/ietp.c | 55 +++++++++++++++++++++++++++++++++++++++--------------- 1 file changed, 40 insertions(+), 15 deletions(-) diff --git a/sys/dev/hid/ietp.c b/sys/dev/hid/ietp.c index 73a5cb7414d4..a9d0295fb121 100644 --- a/sys/dev/hid/ietp.c +++ b/sys/dev/hid/ietp.c @@ -199,17 +199,32 @@ static const struct hid_device_id ietp_iic_devs[] = { IETP_IIC_DEV("ELAN1000"), }; -static uint8_t const ietp_dummy_rdesc[] = { +static uint8_t const ietp_dummy_rdesc_lo[] = { 0x05, HUP_GENERIC_DESKTOP, /* Usage Page (Generic Desktop Ctrls) */ 0x09, HUG_MOUSE, /* Usage (Mouse) */ 0xA1, 0x01, /* Collection (Application) */ 0x09, 0x01, /* Usage (0x01) */ + 0x15, 0x00, /* Logical Minimum (0) */ + 0x26, 0xFF, 0x00, /* Logical Maximum (255) */ 0x95, IETP_REPORT_LEN_LO, /* Report Count (IETP_REPORT_LEN_LO) */ 0x75, 0x08, /* Report Size (8) */ 0x81, 0x02, /* Input (Data,Var,Abs) */ 0xC0, /* End Collection */ }; +static uint8_t const ietp_dummy_rdesc_hi[] = { + 0x05, HUP_GENERIC_DESKTOP, /* Usage Page (Generic Desktop Ctrls) */ + 0x09, HUG_MOUSE, /* Usage (Mouse) */ + 0xA1, 0x01, /* Collection (Application) */ + 0x09, 0x01, /* Usage (0x01) */ + 0x15, 0x00, /* Logical Minimum (0) */ + 0x26, 0xFF, 0x00, /* Logical Maximum (255) */ + 0x95, IETP_REPORT_LEN_HI, /* Report Count (IETP_REPORT_LEN_HI) */ + 0x75, 0x08, /* Report Size (8) */ + 0x81, 0x02, /* Input (Data,Var,Abs) */ + 0xC0, /* End Collection */ +}; + static const struct evdev_methods ietp_evdev_methods = { .ev_open = &ietp_ev_open, .ev_close = &ietp_ev_close, @@ -433,28 +448,38 @@ ietp_res2dpmm(uint8_t res, bool hi_precision) static void ietp_iic_identify(driver_t *driver, device_t parent) { - void *d_ptr; - hid_size_t d_len; - int isize; - uint8_t iid; + device_t iichid = device_get_parent(parent); + static const uint16_t reg = IETP_PATTERN; + uint16_t addr = iicbus_get_addr(iichid) << 1; + uint8_t resp[2]; + uint8_t cmd[2] = { reg & 0xff, (reg >> 8) & 0xff }; + struct iic_msg msgs[2] = { + { addr, IIC_M_WR | IIC_M_NOSTOP, sizeof(cmd), cmd }, + { addr, IIC_M_RD, sizeof(resp), resp }, + }; + struct iic_rdwr_data ird = { msgs, nitems(msgs) }; + uint8_t pattern; if (HIDBUS_LOOKUP_ID(parent, ietp_iic_devs) == NULL) return; - if (hid_get_report_descr(parent, &d_ptr, &d_len) != 0) + + if (device_get_devclass(iichid) != devclass_find("iichid")) return; - /* - * Some Elantech trackpads have a mangled HID report descriptor, which - * reads as having an incorrect input size (i.e. < IETP_REPORT_LEN_LO). - * If the input size is incorrect, load a dummy report descriptor. - */ + DPRINTF("Read reg 0x%04x with size %zu\n", reg, sizeof(resp)); - isize = hid_report_size_max(d_ptr, d_len, hid_input, &iid); - if (isize >= IETP_REPORT_LEN_LO) + if (hid_ioctl(parent, I2CRDWR, (uintptr_t)&ird) != 0) return; - hid_set_report_descr(parent, ietp_dummy_rdesc, - sizeof(ietp_dummy_rdesc)); + DPRINTF("Response: %*D\n", (int)size(resp), resp, " "); + + pattern = (resp[0] == 0xFF && resp[1] == 0xFF) ? 0 : resp[1]; + if (pattern >= 0x02) + hid_set_report_descr(parent, ietp_dummy_rdesc_hi, + sizeof(ietp_dummy_rdesc_hi)); + else + hid_set_report_descr(parent, ietp_dummy_rdesc_lo, + sizeof(ietp_dummy_rdesc_lo)); } static int
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