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cros-ec: Add usb_findit functionality

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Find the interface and endpoint used for firmware updates.
Note: this change now requires libgusb 0.3.3 or later.
This commit is contained in:
Benson Leung 2020-05-18 10:57:40 -07:00 committed by Richard Hughes
parent cd65aeaa41
commit 7aa00f6ee8
2 changed files with 97 additions and 1 deletions
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96
plugins/cros-ec/fu-cros-ec-usb-device.c
View File

@ -10,11 +10,96 @@
#include "fu-cros-ec-usb-device.h"
#define USB_SUBCLASS_GOOGLE_UPDATE 0x53
#define USB_PROTOCOL_GOOGLE_UPDATE 0xff
struct _FuCrosEcUsbDevice {
FuUsbDevice parent_instance;
guint8 iface_idx; /* bInterfaceNumber */
guint8 ep_num; /* bEndpointAddress */
guint16 chunk_len; /* wMaxPacketSize */
};
G_DEFINE_TYPE (FuCrosEcUsbDevice, fu_cros_ec_usb_device, FU_TYPE_USB_DEVICE)
static gboolean
fu_cros_ec_usb_device_find_interface (FuUsbDevice *device,
GError **error)
{
GUsbDevice *usb_device = fu_usb_device_get_dev (device);
FuCrosEcUsbDevice *self = FU_CROS_EC_USB_DEVICE (device);
g_autoptr(GPtrArray) intfs = NULL;
/* based on usb_updater2's find_interfacei() and find_endpoint() */
intfs = g_usb_device_get_interfaces (usb_device, error);
if (intfs == NULL)
return FALSE;
for (guint i = 0; i < intfs->len; i++) {
GUsbInterface *intf = g_ptr_array_index (intfs, i);
if (g_usb_interface_get_class (intf) == 255 &&
g_usb_interface_get_subclass (intf) == USB_SUBCLASS_GOOGLE_UPDATE &&
g_usb_interface_get_protocol (intf) == USB_PROTOCOL_GOOGLE_UPDATE) {
GUsbEndpoint *ep;
g_autoptr(GPtrArray) endpoints = NULL;
endpoints = g_usb_interface_get_endpoints (intf);
if (NULL == endpoints || 0 == endpoints->len)
continue;
ep = g_ptr_array_index (endpoints, 0);
self->iface_idx = g_usb_interface_get_number (intf);
self->ep_num = g_usb_endpoint_get_address (ep) & 0x7f;
self->chunk_len = g_usb_endpoint_get_maximum_packet_size (ep);
return TRUE;
}
}
g_set_error_literal (error,
FWUPD_ERROR,
FWUPD_ERROR_NOT_FOUND,
"no update interface found");
return FALSE;
}
static gboolean
fu_cros_ec_usb_device_open (FuUsbDevice *device, GError **error)
{
GUsbDevice *usb_device = fu_usb_device_get_dev (device);
FuCrosEcUsbDevice *self = FU_CROS_EC_USB_DEVICE (device);
if (!g_usb_device_claim_interface (usb_device, self->iface_idx,
G_USB_DEVICE_CLAIM_INTERFACE_BIND_KERNEL_DRIVER,
error)) {
g_prefix_error (error, "failed to claim interface: ");
return FALSE;
}
/* success */
return TRUE;
}
static gboolean
fu_cros_ec_usb_device_probe (FuUsbDevice *device, GError **error)
{
FuCrosEcUsbDevice *self = FU_CROS_EC_USB_DEVICE (device);
/* very much like usb_updater2's usb_findit() */
if (!fu_cros_ec_usb_device_find_interface (device, error)) {
g_prefix_error (error, "failed to find update interface: ");
return FALSE;
}
if (self->chunk_len == 0) {
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_DATA,
"wMaxPacketSize isn't valid: %" G_GUINT16_FORMAT,
self->chunk_len);
return FALSE;
}
/* success */
return TRUE;
}
@ -29,6 +114,16 @@ fu_cros_ec_usb_device_setup (FuDevice *device, GError **error)
static gboolean
fu_cros_ec_usb_device_close (FuUsbDevice *device, GError **error)
{
GUsbDevice *usb_device = fu_usb_device_get_dev (device);
FuCrosEcUsbDevice *self = FU_CROS_EC_USB_DEVICE (device);
if (!g_usb_device_release_interface (usb_device, self->iface_idx,
G_USB_DEVICE_CLAIM_INTERFACE_BIND_KERNEL_DRIVER,
error)) {
g_prefix_error (error, "failed to release interface: ");
return FALSE;
}
/* success */
return TRUE;
}
@ -46,5 +141,6 @@ fu_cros_ec_usb_device_class_init (FuCrosEcUsbDeviceClass *klass)
FuUsbDeviceClass *klass_usb_device = FU_USB_DEVICE_CLASS (klass);
klass_device->setup = fu_cros_ec_usb_device_setup;
klass_usb_device->open = fu_cros_ec_usb_device_open;
klass_usb_device->probe = fu_cros_ec_usb_device_probe;
klass_usb_device->close = fu_cros_ec_usb_device_close;
}

2
plugins/cros-ec/fu-cros-ec-usb-device.h
View File

@ -9,7 +9,7 @@
#include "fu-plugin.h"
#define FU_TYPE_CROS_EC_USB_DEVICE (fu_cros_ec_usb_device_get_type ())
G_DECLARE_DERIVABLE_TYPE (FuCrosEcUsbDevice, fu_cros_ec_usb_device, FU, CROS_EC_USB_DEVICE, FuUsbDevice)
G_DECLARE_FINAL_TYPE (FuCrosEcUsbDevice, fu_cros_ec_usb_device, FU, CROS_EC_USB_DEVICE, FuUsbDevice)
struct _FuCrosEcUsbDeviceClass
{