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% pciconf -lv pci0:0:31:3
none0@pci0:0:31:3:      class=0x0c0500 card=0x844d1043 chip=0x1c228086 rev=0x05 hdr=0x00
    vendor     = 'Intel Corporation'
    device     = '6 Series/C200 Series Chipset Family SMBus Controller'
    class      = serial bus
    subclass   = SMBus
% grep -R 0x1c22 /usr/src/sys/dev/
/usr/src/sys/dev/bce/if_bcefw.h:0x196c00, 0x187400, 0x25e2ffee, 0x1c22025,
/usr/src/sys/dev/drm/amd/include/asic_reg/dce/dce_8_0_d.h:#define mmAFMT_AVI_INFO1                                                        0x1c22
/usr/src/sys/dev/drm/amd/include/asic_reg/dce/dce_8_0_d.h:#define mmDIG0_AFMT_AVI_INFO1                                                   0x1c22
/usr/src/sys/dev/drm/amd/include/asic_reg/dce/dce_10_0_d.h:#define mmDCP1_OVL_SURFACE_ADDRESS_HIGH                                         0x1c22
/usr/src/sys/dev/ichsmb/ichsmb_pci.c:#define   ID_CPT            0x1c22
/usr/src/sys/dev/qlnx/qlnxe/reg_addr.h:#define CAU_REG_IGU_CMD_FIFO                                                                                 0x1c2200UL //Access:WB_R DataWidth:0x35   // Debug: Provides read-only access of the IGU command FIFO. Intended for test/debug purposes.
% less /usr/src/sys/dev/ichsmb/ichsmb_pci.c
...
#define ID_CPT                          0x1c22
...
static const struct ichsmb_device {
        uint16_t        id;
        const char      *name;
} ichsmb_devices[] = {
...
        { ID_CPT,       "Intel Cougar Point SMBus controller"           },
...
}
% kldload ichsmb
% pciconf -lv pci0:0:31:3
ichsmb0@pci0:0:31:3:    class=0x0c0500 card=0x844d1043 chip=0x1c228086 rev=0x05 hdr=0x00
    vendor     = 'Intel Corporation'
    device     = '6 Series/C200 Series Chipset Family SMBus Controller'
    class      = serial bus
    subclass   = SMBus