diff options
Diffstat (limited to 'net/nfc/hci/shdlc.c')
| -rw-r--r-- | net/nfc/hci/shdlc.c | 918 |
1 files changed, 0 insertions, 918 deletions
diff --git a/net/nfc/hci/shdlc.c b/net/nfc/hci/shdlc.c deleted file mode 100644 index c63af7d3e85..00000000000 --- a/net/nfc/hci/shdlc.c +++ /dev/null @@ -1,918 +0,0 @@ -/* - * Copyright (C) 2012 Intel Corporation. All rights reserved. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the - * Free Software Foundation, Inc., - * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. - */ - -#define pr_fmt(fmt) "shdlc: %s: " fmt, __func__ - -#include <linux/sched.h> -#include <linux/export.h> -#include <linux/wait.h> -#include <linux/slab.h> -#include <linux/skbuff.h> - -#include <net/nfc/hci.h> -#include <net/nfc/shdlc.h> - -#define SHDLC_LLC_HEAD_ROOM 2 - -#define SHDLC_MAX_WINDOW 4 -#define SHDLC_SREJ_SUPPORT false - -#define SHDLC_CONTROL_HEAD_MASK 0xe0 -#define SHDLC_CONTROL_HEAD_I 0x80 -#define SHDLC_CONTROL_HEAD_I2 0xa0 -#define SHDLC_CONTROL_HEAD_S 0xc0 -#define SHDLC_CONTROL_HEAD_U 0xe0 - -#define SHDLC_CONTROL_NS_MASK 0x38 -#define SHDLC_CONTROL_NR_MASK 0x07 -#define SHDLC_CONTROL_TYPE_MASK 0x18 - -#define SHDLC_CONTROL_M_MASK 0x1f - -enum sframe_type { - S_FRAME_RR = 0x00, - S_FRAME_REJ = 0x01, - S_FRAME_RNR = 0x02, - S_FRAME_SREJ = 0x03 -}; - -enum uframe_modifier { - U_FRAME_UA = 0x06, - U_FRAME_RSET = 0x19 -}; - -#define SHDLC_CONNECT_VALUE_MS 5 -#define SHDLC_T1_VALUE_MS(w) ((5 * w) / 4) -#define SHDLC_T2_VALUE_MS 300 - -#define SHDLC_DUMP_SKB(info, skb) \ -do { \ - pr_debug("%s:\n", info); \ - print_hex_dump(KERN_DEBUG, "shdlc: ", DUMP_PREFIX_OFFSET, \ - 16, 1, skb->data, skb->len, 0); \ -} while (0) - -/* checks x < y <= z modulo 8 */ -static bool nfc_shdlc_x_lt_y_lteq_z(int x, int y, int z) -{ - if (x < z) - return ((x < y) && (y <= z)) ? true : false; - else - return ((y > x) || (y <= z)) ? true : false; -} - -/* checks x <= y < z modulo 8 */ -static bool nfc_shdlc_x_lteq_y_lt_z(int x, int y, int z) -{ - if (x <= z) - return ((x <= y) && (y < z)) ? true : false; - else /* x > z -> z+8 > x */ - return ((y >= x) || (y < z)) ? true : false; -} - -static struct sk_buff *nfc_shdlc_alloc_skb(struct nfc_shdlc *shdlc, - int payload_len) -{ - struct sk_buff *skb; - - skb = alloc_skb(shdlc->client_headroom + SHDLC_LLC_HEAD_ROOM + - shdlc->client_tailroom + payload_len, GFP_KERNEL); - if (skb) - skb_reserve(skb, shdlc->client_headroom + SHDLC_LLC_HEAD_ROOM); - - return skb; -} - -/* immediately sends an S frame. */ -static int nfc_shdlc_send_s_frame(struct nfc_shdlc *shdlc, - enum sframe_type sframe_type, int nr) -{ - int r; - struct sk_buff *skb; - - pr_debug("sframe_type=%d nr=%d\n", sframe_type, nr); - - skb = nfc_shdlc_alloc_skb(shdlc, 0); - if (skb == NULL) - return -ENOMEM; - - *skb_push(skb, 1) = SHDLC_CONTROL_HEAD_S | (sframe_type << 3) | nr; - - r = shdlc->ops->xmit(shdlc, skb); - - kfree_skb(skb); - - return r; -} - -/* immediately sends an U frame. skb may contain optional payload */ -static int nfc_shdlc_send_u_frame(struct nfc_shdlc *shdlc, - struct sk_buff *skb, - enum uframe_modifier uframe_modifier) -{ - int r; - - pr_debug("uframe_modifier=%d\n", uframe_modifier); - - *skb_push(skb, 1) = SHDLC_CONTROL_HEAD_U | uframe_modifier; - - r = shdlc->ops->xmit(shdlc, skb); - - kfree_skb(skb); - - return r; -} - -/* - * Free ack_pending frames until y_nr - 1, and reset t2 according to - * the remaining oldest ack_pending frame sent time - */ -static void nfc_shdlc_reset_t2(struct nfc_shdlc *shdlc, int y_nr) -{ - struct sk_buff *skb; - int dnr = shdlc->dnr; /* MUST initially be < y_nr */ - - pr_debug("release ack pending up to frame %d excluded\n", y_nr); - - while (dnr != y_nr) { - pr_debug("release ack pending frame %d\n", dnr); - - skb = skb_dequeue(&shdlc->ack_pending_q); - kfree_skb(skb); - - dnr = (dnr + 1) % 8; - } - - if (skb_queue_empty(&shdlc->ack_pending_q)) { - if (shdlc->t2_active) { - del_timer_sync(&shdlc->t2_timer); - shdlc->t2_active = false; - - pr_debug - ("All sent frames acked. Stopped T2(retransmit)\n"); - } - } else { - skb = skb_peek(&shdlc->ack_pending_q); - - mod_timer(&shdlc->t2_timer, *(unsigned long *)skb->cb + - msecs_to_jiffies(SHDLC_T2_VALUE_MS)); - shdlc->t2_active = true; - - pr_debug - ("Start T2(retransmit) for remaining unacked sent frames\n"); - } -} - -/* - * Receive validated frames from lower layer. skb contains HCI payload only. - * Handle according to algorithm at spec:10.8.2 - */ -static void nfc_shdlc_rcv_i_frame(struct nfc_shdlc *shdlc, - struct sk_buff *skb, int ns, int nr) -{ - int x_ns = ns; - int y_nr = nr; - - pr_debug("recvd I-frame %d, remote waiting frame %d\n", ns, nr); - - if (shdlc->state != SHDLC_CONNECTED) - goto exit; - - if (x_ns != shdlc->nr) { - nfc_shdlc_send_s_frame(shdlc, S_FRAME_REJ, shdlc->nr); - goto exit; - } - - if (shdlc->t1_active == false) { - shdlc->t1_active = true; - mod_timer(&shdlc->t1_timer, - msecs_to_jiffies(SHDLC_T1_VALUE_MS(shdlc->w))); - pr_debug("(re)Start T1(send ack)\n"); - } - - if (skb->len) { - nfc_hci_recv_frame(shdlc->hdev, skb); - skb = NULL; - } - - shdlc->nr = (shdlc->nr + 1) % 8; - - if (nfc_shdlc_x_lt_y_lteq_z(shdlc->dnr, y_nr, shdlc->ns)) { - nfc_shdlc_reset_t2(shdlc, y_nr); - - shdlc->dnr = y_nr; - } - -exit: - kfree_skb(skb); -} - -static void nfc_shdlc_rcv_ack(struct nfc_shdlc *shdlc, int y_nr) -{ - pr_debug("remote acked up to frame %d excluded\n", y_nr); - - if (nfc_shdlc_x_lt_y_lteq_z(shdlc->dnr, y_nr, shdlc->ns)) { - nfc_shdlc_reset_t2(shdlc, y_nr); - shdlc->dnr = y_nr; - } -} - -static void nfc_shdlc_requeue_ack_pending(struct nfc_shdlc *shdlc) -{ - struct sk_buff *skb; - - pr_debug("ns reset to %d\n", shdlc->dnr); - - while ((skb = skb_dequeue_tail(&shdlc->ack_pending_q))) { - skb_pull(skb, 1); /* remove control field */ - skb_queue_head(&shdlc->send_q, skb); - } - shdlc->ns = shdlc->dnr; -} - -static void nfc_shdlc_rcv_rej(struct nfc_shdlc *shdlc, int y_nr) -{ - struct sk_buff *skb; - - pr_debug("remote asks retransmition from frame %d\n", y_nr); - - if (nfc_shdlc_x_lteq_y_lt_z(shdlc->dnr, y_nr, shdlc->ns)) { - if (shdlc->t2_active) { - del_timer_sync(&shdlc->t2_timer); - shdlc->t2_active = false; - pr_debug("Stopped T2(retransmit)\n"); - } - - if (shdlc->dnr != y_nr) { - while ((shdlc->dnr = ((shdlc->dnr + 1) % 8)) != y_nr) { - skb = skb_dequeue(&shdlc->ack_pending_q); - kfree_skb(skb); - } - } - - nfc_shdlc_requeue_ack_pending(shdlc); - } -} - -/* See spec RR:10.8.3 REJ:10.8.4 */ -static void nfc_shdlc_rcv_s_frame(struct nfc_shdlc *shdlc, - enum sframe_type s_frame_type, int nr) -{ - struct sk_buff *skb; - - if (shdlc->state != SHDLC_CONNECTED) - return; - - switch (s_frame_type) { - case S_FRAME_RR: - nfc_shdlc_rcv_ack(shdlc, nr); - if (shdlc->rnr == true) { /* see SHDLC 10.7.7 */ - shdlc->rnr = false; - if (shdlc->send_q.qlen == 0) { - skb = nfc_shdlc_alloc_skb(shdlc, 0); - if (skb) - skb_queue_tail(&shdlc->send_q, skb); - } - } - break; - case S_FRAME_REJ: - nfc_shdlc_rcv_rej(shdlc, nr); - break; - case S_FRAME_RNR: - nfc_shdlc_rcv_ack(shdlc, nr); - shdlc->rnr = true; - break; - default: - break; - } -} - -static void nfc_shdlc_connect_complete(struct nfc_shdlc *shdlc, int r) -{ - pr_debug("result=%d\n", r); - - del_timer_sync(&shdlc->connect_timer); - - if (r == 0) { - shdlc->ns = 0; - shdlc->nr = 0; - shdlc->dnr = 0; - - shdlc->state = SHDLC_CONNECTED; - } else { - shdlc->state = SHDLC_DISCONNECTED; - } - - shdlc->connect_result = r; - - wake_up(shdlc->connect_wq); -} - -static int nfc_shdlc_connect_initiate(struct nfc_shdlc *shdlc) -{ - struct sk_buff *skb; - - pr_debug("\n"); - - skb = nfc_shdlc_alloc_skb(shdlc, 2); - if (skb == NULL) - return -ENOMEM; - - *skb_put(skb, 1) = SHDLC_MAX_WINDOW; - *skb_put(skb, 1) = SHDLC_SREJ_SUPPORT ? 1 : 0; - - return nfc_shdlc_send_u_frame(shdlc, skb, U_FRAME_RSET); -} - -static int nfc_shdlc_connect_send_ua(struct nfc_shdlc *shdlc) -{ - struct sk_buff *skb; - - pr_debug("\n"); - - skb = nfc_shdlc_alloc_skb(shdlc, 0); - if (skb == NULL) - return -ENOMEM; - - return nfc_shdlc_send_u_frame(shdlc, skb, U_FRAME_UA); -} - -static void nfc_shdlc_rcv_u_frame(struct nfc_shdlc *shdlc, - struct sk_buff *skb, - enum uframe_modifier u_frame_modifier) -{ - u8 w = SHDLC_MAX_WINDOW; - bool srej_support = SHDLC_SREJ_SUPPORT; - int r; - - pr_debug("u_frame_modifier=%d\n", u_frame_modifier); - - switch (u_frame_modifier) { - case U_FRAME_RSET: - if (shdlc->state == SHDLC_NEGOCIATING) { - /* we sent RSET, but chip wants to negociate */ - if (skb->len > 0) - w = skb->data[0]; - - if (skb->len > 1) - srej_support = skb->data[1] & 0x01 ? true : - false; - - if ((w <= SHDLC_MAX_WINDOW) && - (SHDLC_SREJ_SUPPORT || (srej_support == false))) { - shdlc->w = w; - shdlc->srej_support = srej_support; - r = nfc_shdlc_connect_send_ua(shdlc); - nfc_shdlc_connect_complete(shdlc, r); - } - } else if (shdlc->state == SHDLC_CONNECTED) { - /* - * Chip wants to reset link. This is unexpected and - * unsupported. - */ - shdlc->hard_fault = -ECONNRESET; - } - break; - case U_FRAME_UA: - if ((shdlc->state == SHDLC_CONNECTING && - shdlc->connect_tries > 0) || - (shdlc->state == SHDLC_NEGOCIATING)) - nfc_shdlc_connect_complete(shdlc, 0); - break; - default: - break; - } - - kfree_skb(skb); -} - -static void nfc_shdlc_handle_rcv_queue(struct nfc_shdlc *shdlc) -{ - struct sk_buff *skb; - u8 control; - int nr; - int ns; - enum sframe_type s_frame_type; - enum uframe_modifier u_frame_modifier; - - if (shdlc->rcv_q.qlen) - pr_debug("rcvQlen=%d\n", shdlc->rcv_q.qlen); - - while ((skb = skb_dequeue(&shdlc->rcv_q)) != NULL) { - control = skb->data[0]; - skb_pull(skb, 1); - switch (control & SHDLC_CONTROL_HEAD_MASK) { - case SHDLC_CONTROL_HEAD_I: - case SHDLC_CONTROL_HEAD_I2: - ns = (control & SHDLC_CONTROL_NS_MASK) >> 3; - nr = control & SHDLC_CONTROL_NR_MASK; - nfc_shdlc_rcv_i_frame(shdlc, skb, ns, nr); - break; - case SHDLC_CONTROL_HEAD_S: - s_frame_type = (control & SHDLC_CONTROL_TYPE_MASK) >> 3; - nr = control & SHDLC_CONTROL_NR_MASK; - nfc_shdlc_rcv_s_frame(shdlc, s_frame_type, nr); - kfree_skb(skb); - break; - case SHDLC_CONTROL_HEAD_U: - u_frame_modifier = control & SHDLC_CONTROL_M_MASK; - nfc_shdlc_rcv_u_frame(shdlc, skb, u_frame_modifier); - break; - default: - pr_err("UNKNOWN Control=%d\n", control); - kfree_skb(skb); - break; - } - } -} - -static int nfc_shdlc_w_used(int ns, int dnr) -{ - int unack_count; - - if (dnr <= ns) - unack_count = ns - dnr; - else - unack_count = 8 - dnr + ns; - - return unack_count; -} - -/* Send frames according to algorithm at spec:10.8.1 */ -static void nfc_shdlc_handle_send_queue(struct nfc_shdlc *shdlc) -{ - struct sk_buff *skb; - int r; - unsigned long time_sent; - - if (shdlc->send_q.qlen) - pr_debug - ("sendQlen=%d ns=%d dnr=%d rnr=%s w_room=%d unackQlen=%d\n", - shdlc->send_q.qlen, shdlc->ns, shdlc->dnr, - shdlc->rnr == false ? "false" : "true", - shdlc->w - nfc_shdlc_w_used(shdlc->ns, shdlc->dnr), - shdlc->ack_pending_q.qlen); - - while (shdlc->send_q.qlen && shdlc->ack_pending_q.qlen < shdlc->w && - (shdlc->rnr == false)) { - - if (shdlc->t1_active) { - del_timer_sync(&shdlc->t1_timer); - shdlc->t1_active = false; - pr_debug("Stopped T1(send ack)\n"); - } - - skb = skb_dequeue(&shdlc->send_q); - - *skb_push(skb, 1) = SHDLC_CONTROL_HEAD_I | (shdlc->ns << 3) | - shdlc->nr; - - pr_debug("Sending I-Frame %d, waiting to rcv %d\n", shdlc->ns, - shdlc->nr); - /* SHDLC_DUMP_SKB("shdlc frame written", skb); */ - - r = shdlc->ops->xmit(shdlc, skb); - if (r < 0) { - shdlc->hard_fault = r; - break; - } - - shdlc->ns = (shdlc->ns + 1) % 8; - - time_sent = jiffies; - *(unsigned long *)skb->cb = time_sent; - - skb_queue_tail(&shdlc->ack_pending_q, skb); - - if (shdlc->t2_active == false) { - shdlc->t2_active = true; - mod_timer(&shdlc->t2_timer, time_sent + - msecs_to_jiffies(SHDLC_T2_VALUE_MS)); - pr_debug("Started T2 (retransmit)\n"); - } - } -} - -static void nfc_shdlc_connect_timeout(unsigned long data) -{ - struct nfc_shdlc *shdlc = (struct nfc_shdlc *)data; - - pr_debug("\n"); - - queue_work(system_nrt_wq, &shdlc->sm_work); -} - -static void nfc_shdlc_t1_timeout(unsigned long data) -{ - struct nfc_shdlc *shdlc = (struct nfc_shdlc *)data; - - pr_debug("SoftIRQ: need to send ack\n"); - - queue_work(system_nrt_wq, &shdlc->sm_work); -} - -static void nfc_shdlc_t2_timeout(unsigned long data) -{ - struct nfc_shdlc *shdlc = (struct nfc_shdlc *)data; - - pr_debug("SoftIRQ: need to retransmit\n"); - - queue_work(system_nrt_wq, &shdlc->sm_work); -} - -static void nfc_shdlc_sm_work(struct work_struct *work) -{ - struct nfc_shdlc *shdlc = container_of(work, struct nfc_shdlc, sm_work); - int r; - - pr_debug("\n"); - - mutex_lock(&shdlc->state_mutex); - - switch (shdlc->state) { - case SHDLC_DISCONNECTED: - skb_queue_purge(&shdlc->rcv_q); - skb_queue_purge(&shdlc->send_q); - skb_queue_purge(&shdlc->ack_pending_q); - break; - case SHDLC_CONNECTING: - if (shdlc->hard_fault) { - nfc_shdlc_connect_complete(shdlc, shdlc->hard_fault); - break; - } - - if (shdlc->connect_tries++ < 5) - r = nfc_shdlc_connect_initiate(shdlc); - else - r = -ETIME; - if (r < 0) - nfc_shdlc_connect_complete(shdlc, r); - else { - mod_timer(&shdlc->connect_timer, jiffies + - msecs_to_jiffies(SHDLC_CONNECT_VALUE_MS)); - - shdlc->state = SHDLC_NEGOCIATING; - } - break; - case SHDLC_NEGOCIATING: - if (timer_pending(&shdlc->connect_timer) == 0) { - shdlc->state = SHDLC_CONNECTING; - queue_work(system_nrt_wq, &shdlc->sm_work); - } - - nfc_shdlc_handle_rcv_queue(shdlc); - - if (shdlc->hard_fault) { - nfc_shdlc_connect_complete(shdlc, shdlc->hard_fault); - break; - } - break; - case SHDLC_CONNECTED: - nfc_shdlc_handle_rcv_queue(shdlc); - nfc_shdlc_handle_send_queue(shdlc); - - if (shdlc->t1_active && timer_pending(&shdlc->t1_timer) == 0) { - pr_debug - ("Handle T1(send ack) elapsed (T1 now inactive)\n"); - - shdlc->t1_active = false; - r = nfc_shdlc_send_s_frame(shdlc, S_FRAME_RR, - shdlc->nr); - if (r < 0) - shdlc->hard_fault = r; - } - - if (shdlc->t2_active && timer_pending(&shdlc->t2_timer) == 0) { - pr_debug - ("Handle T2(retransmit) elapsed (T2 inactive)\n"); - - shdlc->t2_active = false; - - nfc_shdlc_requeue_ack_pending(shdlc); - nfc_shdlc_handle_send_queue(shdlc); - } - - if (shdlc->hard_fault) { - nfc_hci_driver_failure(shdlc->hdev, shdlc->hard_fault); - } - break; - default: - break; - } - mutex_unlock(&shdlc->state_mutex); -} - -/* - * Called from syscall context to establish shdlc link. Sleeps until - * link is ready or failure. - */ -static int nfc_shdlc_connect(struct nfc_shdlc *shdlc) -{ - DECLARE_WAIT_QUEUE_HEAD_ONSTACK(connect_wq); - - pr_debug("\n"); - - mutex_lock(&shdlc->state_mutex); - - shdlc->state = SHDLC_CONNECTING; - shdlc->connect_wq = &connect_wq; - shdlc->connect_tries = 0; - shdlc->connect_result = 1; - - mutex_unlock(&shdlc->state_mutex); - - queue_work(system_nrt_wq, &shdlc->sm_work); - - wait_event(connect_wq, shdlc->connect_result != 1); - - return shdlc->connect_result; -} - -static void nfc_shdlc_disconnect(struct nfc_shdlc *shdlc) -{ - pr_debug("\n"); - - mutex_lock(&shdlc->state_mutex); - - shdlc->state = SHDLC_DISCONNECTED; - - mutex_unlock(&shdlc->state_mutex); - - queue_work(system_nrt_wq, &shdlc->sm_work); -} - -/* - * Receive an incoming shdlc frame. Frame has already been crc-validated. - * skb contains only LLC header and payload. - * If skb == NULL, it is a notification that the link below is dead. - */ -void nfc_shdlc_recv_frame(struct nfc_shdlc *shdlc, struct sk_buff *skb) -{ - if (skb == NULL) { - pr_err("NULL Frame -> link is dead\n"); - shdlc->hard_fault = -EREMOTEIO; - } else { - SHDLC_DUMP_SKB("incoming frame", skb); - skb_queue_tail(&shdlc->rcv_q, skb); - } - - queue_work(system_nrt_wq, &shdlc->sm_work); -} -EXPORT_SYMBOL(nfc_shdlc_recv_frame); - -static int nfc_shdlc_open(struct nfc_hci_dev *hdev) -{ - struct nfc_shdlc *shdlc = nfc_hci_get_clientdata(hdev); - int r; - - pr_debug("\n"); - - if (shdlc->ops->open) { - r = shdlc->ops->open(shdlc); - if (r < 0) - return r; - } - - r = nfc_shdlc_connect(shdlc); - if (r < 0 && shdlc->ops->close) - shdlc->ops->close(shdlc); - - return r; -} - -static void nfc_shdlc_close(struct nfc_hci_dev *hdev) -{ - struct nfc_shdlc *shdlc = nfc_hci_get_clientdata(hdev); - - pr_debug("\n"); - - nfc_shdlc_disconnect(shdlc); - - if (shdlc->ops->close) - shdlc->ops->close(shdlc); -} - -static int nfc_shdlc_hci_ready(struct nfc_hci_dev *hdev) -{ - struct nfc_shdlc *shdlc = nfc_hci_get_clientdata(hdev); - int r = 0; - - pr_debug("\n"); - - if (shdlc->ops->hci_ready) - r = shdlc->ops->hci_ready(shdlc); - - return r; -} - -static int nfc_shdlc_xmit(struct nfc_hci_dev *hdev, struct sk_buff *skb) -{ - struct nfc_shdlc *shdlc = nfc_hci_get_clientdata(hdev); - - SHDLC_DUMP_SKB("queuing HCP packet to shdlc", skb); - - skb_queue_tail(&shdlc->send_q, skb); - - queue_work(system_nrt_wq, &shdlc->sm_work); - - return 0; -} - -static int nfc_shdlc_start_poll(struct nfc_hci_dev *hdev, - u32 im_protocols, u32 tm_protocols) -{ - struct nfc_shdlc *shdlc = nfc_hci_get_clientdata(hdev); - - pr_debug("\n"); - - if (shdlc->ops->start_poll) - return shdlc->ops->start_poll(shdlc, - im_protocols, tm_protocols); - - return 0; -} - -static int nfc_shdlc_target_from_gate(struct nfc_hci_dev *hdev, u8 gate, - struct nfc_target *target) -{ - struct nfc_shdlc *shdlc = nfc_hci_get_clientdata(hdev); - - if (shdlc->ops->target_from_gate) - return shdlc->ops->target_from_gate(shdlc, gate, target); - - return -EPERM; -} - -static int nfc_shdlc_complete_target_discovered(struct nfc_hci_dev *hdev, - u8 gate, - struct nfc_target *target) -{ - struct nfc_shdlc *shdlc = nfc_hci_get_clientdata(hdev); - - pr_debug("\n"); - - if (shdlc->ops->complete_target_discovered) - return shdlc->ops->complete_target_discovered(shdlc, gate, - target); - - return 0; -} - -static int nfc_shdlc_data_exchange(struct nfc_hci_dev *hdev, - struct nfc_target *target, - struct sk_buff *skb, - data_exchange_cb_t cb, void *cb_context) -{ - struct nfc_shdlc *shdlc = nfc_hci_get_clientdata(hdev); - - if (shdlc->ops->data_exchange) - return shdlc->ops->data_exchange(shdlc, target, skb, cb, - cb_context); - - return -EPERM; -} - -static int nfc_shdlc_check_presence(struct nfc_hci_dev *hdev, - struct nfc_target *target) -{ - struct nfc_shdlc *shdlc = nfc_hci_get_clientdata(hdev); - - if (shdlc->ops->check_presence) - return shdlc->ops->check_presence(shdlc, target); - - return 0; -} - -static struct nfc_hci_ops shdlc_ops = { - .open = nfc_shdlc_open, - .close = nfc_shdlc_close, - .hci_ready = nfc_shdlc_hci_ready, - .xmit = nfc_shdlc_xmit, - .start_poll = nfc_shdlc_start_poll, - .target_from_gate = nfc_shdlc_target_from_gate, - .complete_target_discovered = nfc_shdlc_complete_target_discovered, - .data_exchange = nfc_shdlc_data_exchange, - .check_presence = nfc_shdlc_check_presence, -}; - -struct nfc_shdlc *nfc_shdlc_allocate(struct nfc_shdlc_ops *ops, - struct nfc_hci_init_data *init_data, - u32 protocols, - int tx_headroom, int tx_tailroom, - int max_link_payload, const char *devname) -{ - struct nfc_shdlc *shdlc; - int r; - - if (ops->xmit == NULL) - return NULL; - - shdlc = kzalloc(sizeof(struct nfc_shdlc), GFP_KERNEL); - if (shdlc == NULL) - return NULL; - - mutex_init(&shdlc->state_mutex); - shdlc->ops = ops; - shdlc->state = SHDLC_DISCONNECTED; - - init_timer(&shdlc->connect_timer); - shdlc->connect_timer.data = (unsigned long)shdlc; - shdlc->connect_timer.function = nfc_shdlc_connect_timeout; - - init_timer(&shdlc->t1_timer); - shdlc->t1_timer.data = (unsigned long)shdlc; - shdlc->t1_timer.function = nfc_shdlc_t1_timeout; - - init_timer(&shdlc->t2_timer); - shdlc->t2_timer.data = (unsigned long)shdlc; - shdlc->t2_timer.function = nfc_shdlc_t2_timeout; - - shdlc->w = SHDLC_MAX_WINDOW; - shdlc->srej_support = SHDLC_SREJ_SUPPORT; - - skb_queue_head_init(&shdlc->rcv_q); - skb_queue_head_init(&shdlc->send_q); - skb_queue_head_init(&shdlc->ack_pending_q); - - INIT_WORK(&shdlc->sm_work, nfc_shdlc_sm_work); - - shdlc->client_headroom = tx_headroom; - shdlc->client_tailroom = tx_tailroom; - - shdlc->hdev = nfc_hci_allocate_device(&shdlc_ops, init_data, protocols, - tx_headroom + SHDLC_LLC_HEAD_ROOM, - tx_tailroom, - max_link_payload); - if (shdlc->hdev == NULL) - goto err_allocdev; - - nfc_hci_set_clientdata(shdlc->hdev, shdlc); - - r = nfc_hci_register_device(shdlc->hdev); - if (r < 0) - goto err_regdev; - - return shdlc; - -err_regdev: - nfc_hci_free_device(shdlc->hdev); - -err_allocdev: - kfree(shdlc); - - return NULL; -} -EXPORT_SYMBOL(nfc_shdlc_allocate); - -void nfc_shdlc_free(struct nfc_shdlc *shdlc) -{ - pr_debug("\n"); - - nfc_hci_unregister_device(shdlc->hdev); - nfc_hci_free_device(shdlc->hdev); - - cancel_work_sync(&shdlc->sm_work); - - skb_queue_purge(&shdlc->rcv_q); - skb_queue_purge(&shdlc->send_q); - skb_queue_purge(&shdlc->ack_pending_q); - - kfree(shdlc); -} -EXPORT_SYMBOL(nfc_shdlc_free); - -void nfc_shdlc_set_clientdata(struct nfc_shdlc *shdlc, void *clientdata) -{ - pr_debug("\n"); - - shdlc->clientdata = clientdata; -} -EXPORT_SYMBOL(nfc_shdlc_set_clientdata); - -void *nfc_shdlc_get_clientdata(struct nfc_shdlc *shdlc) -{ - return shdlc->clientdata; -} -EXPORT_SYMBOL(nfc_shdlc_get_clientdata); - -struct nfc_hci_dev *nfc_shdlc_get_hci_dev(struct nfc_shdlc *shdlc) -{ - return shdlc->hdev; -} -EXPORT_SYMBOL(nfc_shdlc_get_hci_dev); |