/* * MEI Library for mei bus nfc device access * * Copyright (C) 2013 Intel Corporation. All rights reserved. * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * 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. */ #include <linux/module.h> #include <linux/slab.h> #include <linux/nfc.h> #include "mei_phy.h" struct mei_nfc_hdr { u8 cmd; u8 status; u16 req_id; u32 reserved; u16 data_size; } __packed; #define MEI_NFC_MAX_READ (MEI_NFC_HEADER_SIZE + MEI_NFC_MAX_HCI_PAYLOAD) #define MEI_DUMP_SKB_IN(info, skb) \ do { \ pr_debug("%s:\n", info); \ print_hex_dump_debug("mei in : ", DUMP_PREFIX_OFFSET, \ 16, 1, (skb)->data, (skb)->len, false); \ } while (0) #define MEI_DUMP_SKB_OUT(info, skb) \ do { \ pr_debug("%s:\n", info); \ print_hex_dump_debug("mei out: ", DUMP_PREFIX_OFFSET, \ 16, 1, (skb)->data, (skb)->len, false); \ } while (0) int nfc_mei_phy_enable(void *phy_id) { int r; struct nfc_mei_phy *phy = phy_id; pr_info("%s\n", __func__); if (phy->powered == 1) return 0; r = mei_cl_enable_device(phy->device); if (r < 0) { pr_err("MEI_PHY: Could not enable device\n"); return r; } r = mei_cl_register_event_cb(phy->device, nfc_mei_event_cb, phy); if (r) { pr_err("MEY_PHY: Event cb registration failed\n"); mei_cl_disable_device(phy->device); phy->powered = 0; return r; } phy->powered = 1; return 0; } EXPORT_SYMBOL_GPL(nfc_mei_phy_enable); void nfc_mei_phy_disable(void *phy_id) { struct nfc_mei_phy *phy = phy_id; pr_info("%s\n", __func__); mei_cl_disable_device(phy->device); phy->powered = 0; } EXPORT_SYMBOL_GPL(nfc_mei_phy_disable); /* * Writing a frame must not return the number of written bytes. * It must return either zero for success, or <0 for error. * In addition, it must not alter the skb */ static int nfc_mei_phy_write(void *phy_id, struct sk_buff *skb) { struct nfc_mei_phy *phy = phy_id; int r; MEI_DUMP_SKB_OUT("mei frame sent", skb); r = mei_cl_send(phy->device, skb->data, skb->len); if (r > 0) r = 0; return r; } void nfc_mei_event_cb(struct mei_cl_device *device, u32 events, void *context) { struct nfc_mei_phy *phy = context; if (phy->hard_fault != 0) return; if (events & BIT(MEI_CL_EVENT_RX)) { struct sk_buff *skb; int reply_size; skb = alloc_skb(MEI_NFC_MAX_READ, GFP_KERNEL); if (!skb) return; reply_size = mei_cl_recv(device, skb->data, MEI_NFC_MAX_READ); if (reply_size < MEI_NFC_HEADER_SIZE) { kfree(skb); return; } skb_put(skb, reply_size); skb_pull(skb, MEI_NFC_HEADER_SIZE); MEI_DUMP_SKB_IN("mei frame read", skb); nfc_hci_recv_frame(phy->hdev, skb); } } EXPORT_SYMBOL_GPL(nfc_mei_event_cb); struct nfc_phy_ops mei_phy_ops = { .write = nfc_mei_phy_write, .enable = nfc_mei_phy_enable, .disable = nfc_mei_phy_disable, }; EXPORT_SYMBOL_GPL(mei_phy_ops); struct nfc_mei_phy *nfc_mei_phy_alloc(struct mei_cl_device *device) { struct nfc_mei_phy *phy; phy = kzalloc(sizeof(struct nfc_mei_phy), GFP_KERNEL); if (!phy) return NULL; phy->device = device; mei_cl_set_drvdata(device, phy); return phy; } EXPORT_SYMBOL_GPL(nfc_mei_phy_alloc); void nfc_mei_phy_free(struct nfc_mei_phy *phy) { kfree(phy); } EXPORT_SYMBOL_GPL(nfc_mei_phy_free); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("mei bus NFC device interface");