unimore/kernel-hacking-2024-linux-steffo
unimore/kernel-hacking-2024-linux-steffo
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NFC: hci: Add load_session HCI operand

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load_session allows a CLF to restore the gate <-> pipe table from some
proprietary location.
The main advantage to add this function is to reduce the memory wear by
running pipe creation (and storing) only once.

Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Christophe Ricard 2014-03-25 06:51:49 +01:00 committed by Samuel Ortiz
parent d330905db6
commit e240bc3612
2 changed files with 22 additions and 24 deletions
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1
include/net/nfc/hci.h
View file

@ -27,6 +27,7 @@ struct nfc_hci_dev;
struct nfc_hci_ops {
int (*open) (struct nfc_hci_dev *hdev);
void (*close) (struct nfc_hci_dev *hdev);
int (*load_session) (struct nfc_hci_dev *hdev);
int (*hci_ready) (struct nfc_hci_dev *hdev);
/*
* xmit must always send the complete buffer before

45
net/nfc/hci/core.c
View file

@ -380,34 +380,31 @@ static int hci_dev_session_init(struct nfc_hci_dev *hdev)
if (r < 0)
goto disconnect_all;
if (skb->len && skb->len == strlen(hdev->init_data.session_id))
if (memcmp(hdev->init_data.session_id, skb->data,
skb->len) == 0) {
/* TODO ELa: restore gate<->pipe table from
* some TBD location.
* note: it doesn't seem possible to get the chip
* currently open gate/pipe table.
* It is only possible to obtain the supported
* gate list.
*/
if (skb->len && skb->len == strlen(hdev->init_data.session_id) &&
(memcmp(hdev->init_data.session_id, skb->data,
skb->len) == 0) && hdev->ops->load_session) {
/* Restore gate<->pipe table from some proprietary location. */
/* goto exit
* For now, always do a full initialization */
}
r = hdev->ops->load_session(hdev);
r = nfc_hci_disconnect_all_gates(hdev);
if (r < 0)
goto exit;
if (r < 0)
goto disconnect_all;
} else {
r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count,
hdev->init_data.gates);
if (r < 0)
goto disconnect_all;
r = nfc_hci_disconnect_all_gates(hdev);
if (r < 0)
goto exit;
r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
NFC_HCI_ADMIN_SESSION_IDENTITY,
hdev->init_data.session_id,
strlen(hdev->init_data.session_id));
r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count,
hdev->init_data.gates);
if (r < 0)
goto disconnect_all;
r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
NFC_HCI_ADMIN_SESSION_IDENTITY,
hdev->init_data.session_id,
strlen(hdev->init_data.session_id));
}
if (r == 0)
goto exit;