Hello,
according to QEMU mailing list [1] and source code [2] QEMU contain i2c.
I tried to setup i2c tmp105 sensor using [3] guide and read it under
OVMF. Qemu monitor command 'info qtree' show:
bus: pci.0
type PCI
dev: PIIX4_PM, id ""
smb_io_base = 45312 (0xb100)
disable_s3 = 0 (0)
disable_s4 = 0 (0)
s4_val = 2 (0x2)
acpi-pci-hotplug-with-bridge-support = true
addr = 01.3
romfile = ""
rombar = 1 (0x1)
multifunction = false
command_serr_enable = true
class Bridge, addr 00:01.3, pci id 8086:7113 (sub 1af4:1100)
bus: i2c
type i2c-bus
dev: tmp105, id "sensor"
gpio-out 1
address = 80 (0x50)
dev: smbus-eeprom, id ""
address = 87 (0x57)
So if I understand correctly i2c-bus should be on BDF: 0/1/3, pci command from
UEFI Shell show that this device have all zeros in BAR. Am I missing something ?
Is there any driver required to access this device ? If not can you point me to
knowledge that help me with implementing this kind of support ?
Regards,
Piotr Król
[1] https://lists.gnu.org/archive/html/qemu-devel/2007-05/msg00192.html
[2] https://github.com/qemu/qemu/tree/master/hw/i2c
[3] https://lists.gnu.org/archive/html/qemu-devel/2014-02/msg02681.html
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