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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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1e37be7d27
Change dev_up and dev_down functions of struct pn533_phy_ops to return
int. This way the pn533 core can report errors in the phy layer to upper
layers.
The only user of this is currently uart.c and it is changed to report
the error of a possibly failing call to serdev_device_open.
Reported-by: coverity-bot <keescook+coverity-bot@chromium.org>
Addresses-Coverity-ID: 1487395 ("Error handling issues")
Fixes: c656aa4c27 ("nfc: pn533: add UART phy driver")
Signed-off-by: Lars Poeschel <poeschel@lemonage.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
250 lines
6.8 KiB
C
250 lines
6.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Driver for NXP PN533 NFC Chip
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*
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* Copyright (C) 2011 Instituto Nokia de Tecnologia
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* Copyright (C) 2012-2013 Tieto Poland
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*/
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#define PN533_DEVICE_STD 0x1
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#define PN533_DEVICE_PASORI 0x2
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#define PN533_DEVICE_ACR122U 0x3
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#define PN533_DEVICE_PN532 0x4
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#define PN533_DEVICE_PN532_AUTOPOLL 0x5
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#define PN533_ALL_PROTOCOLS (NFC_PROTO_JEWEL_MASK | NFC_PROTO_MIFARE_MASK |\
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NFC_PROTO_FELICA_MASK | NFC_PROTO_ISO14443_MASK |\
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NFC_PROTO_NFC_DEP_MASK |\
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NFC_PROTO_ISO14443_B_MASK)
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#define PN533_NO_TYPE_B_PROTOCOLS (NFC_PROTO_JEWEL_MASK | \
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NFC_PROTO_MIFARE_MASK | \
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NFC_PROTO_FELICA_MASK | \
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NFC_PROTO_ISO14443_MASK | \
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NFC_PROTO_NFC_DEP_MASK)
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/* Standard pn533 frame definitions (standard and extended)*/
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#define PN533_STD_FRAME_HEADER_LEN (sizeof(struct pn533_std_frame) \
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+ 2) /* data[0] TFI, data[1] CC */
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#define PN533_STD_FRAME_TAIL_LEN 2 /* data[len] DCS, data[len + 1] postamble*/
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#define PN533_EXT_FRAME_HEADER_LEN (sizeof(struct pn533_ext_frame) \
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+ 2) /* data[0] TFI, data[1] CC */
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#define PN533_CMD_DATAEXCH_HEAD_LEN 1
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#define PN533_CMD_DATAEXCH_DATA_MAXLEN 262
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#define PN533_CMD_DATAFRAME_MAXLEN 240 /* max data length (send) */
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/*
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* Max extended frame payload len, excluding TFI and CC
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* which are already in PN533_FRAME_HEADER_LEN.
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*/
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#define PN533_STD_FRAME_MAX_PAYLOAD_LEN 263
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/* Preamble (1), SoPC (2), ACK Code (2), Postamble (1) */
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#define PN533_STD_FRAME_ACK_SIZE 6
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/*
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* Preamble (1), SoPC (2), Packet Length (1), Packet Length Checksum (1),
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* Specific Application Level Error Code (1) , Postamble (1)
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*/
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#define PN533_STD_ERROR_FRAME_SIZE 8
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#define PN533_STD_FRAME_CHECKSUM(f) (f->data[f->datalen])
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#define PN533_STD_FRAME_POSTAMBLE(f) (f->data[f->datalen + 1])
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/* Half start code (3), LEN (4) should be 0xffff for extended frame */
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#define PN533_STD_IS_EXTENDED(hdr) ((hdr)->datalen == 0xFF \
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&& (hdr)->datalen_checksum == 0xFF)
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#define PN533_EXT_FRAME_CHECKSUM(f) (f->data[be16_to_cpu(f->datalen)])
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/* start of frame */
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#define PN533_STD_FRAME_SOF 0x00FF
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/* standard frame identifier: in/out/error */
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#define PN533_STD_FRAME_IDENTIFIER(f) (f->data[0]) /* TFI */
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#define PN533_STD_FRAME_DIR_OUT 0xD4
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#define PN533_STD_FRAME_DIR_IN 0xD5
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/* PN533 Commands */
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#define PN533_FRAME_CMD(f) (f->data[1])
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#define PN533_CMD_GET_FIRMWARE_VERSION 0x02
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#define PN533_CMD_SAM_CONFIGURATION 0x14
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#define PN533_CMD_RF_CONFIGURATION 0x32
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#define PN533_CMD_IN_DATA_EXCHANGE 0x40
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#define PN533_CMD_IN_COMM_THRU 0x42
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#define PN533_CMD_IN_LIST_PASSIVE_TARGET 0x4A
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#define PN533_CMD_IN_ATR 0x50
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#define PN533_CMD_IN_RELEASE 0x52
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#define PN533_CMD_IN_JUMP_FOR_DEP 0x56
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#define PN533_CMD_IN_AUTOPOLL 0x60
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#define PN533_CMD_TG_INIT_AS_TARGET 0x8c
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#define PN533_CMD_TG_GET_DATA 0x86
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#define PN533_CMD_TG_SET_DATA 0x8e
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#define PN533_CMD_TG_SET_META_DATA 0x94
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#define PN533_CMD_UNDEF 0xff
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#define PN533_CMD_RESPONSE(cmd) (cmd + 1)
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/* PN533 Return codes */
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#define PN533_CMD_RET_MASK 0x3F
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#define PN533_CMD_MI_MASK 0x40
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#define PN533_CMD_RET_SUCCESS 0x00
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#define PN533_FRAME_DATALEN_ACK 0x00
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#define PN533_FRAME_DATALEN_ERROR 0x01
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#define PN533_FRAME_DATALEN_EXTENDED 0xFF
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enum pn533_protocol_type {
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PN533_PROTO_REQ_ACK_RESP = 0,
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PN533_PROTO_REQ_RESP
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};
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/* Poll modulations */
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enum {
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PN533_POLL_MOD_106KBPS_A,
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PN533_POLL_MOD_212KBPS_FELICA,
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PN533_POLL_MOD_424KBPS_FELICA,
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PN533_POLL_MOD_106KBPS_JEWEL,
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PN533_POLL_MOD_847KBPS_B,
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PN533_LISTEN_MOD,
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__PN533_POLL_MOD_AFTER_LAST,
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};
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#define PN533_POLL_MOD_MAX (__PN533_POLL_MOD_AFTER_LAST - 1)
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struct pn533_std_frame {
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u8 preamble;
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__be16 start_frame;
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u8 datalen;
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u8 datalen_checksum;
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u8 data[];
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} __packed;
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struct pn533_ext_frame { /* Extended Information frame */
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u8 preamble;
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__be16 start_frame;
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__be16 eif_flag; /* fixed to 0xFFFF */
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__be16 datalen;
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u8 datalen_checksum;
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u8 data[];
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} __packed;
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struct pn533 {
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struct nfc_dev *nfc_dev;
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u32 device_type;
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enum pn533_protocol_type protocol_type;
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struct sk_buff_head resp_q;
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struct sk_buff_head fragment_skb;
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struct workqueue_struct *wq;
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struct work_struct cmd_work;
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struct work_struct cmd_complete_work;
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struct delayed_work poll_work;
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struct work_struct mi_rx_work;
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struct work_struct mi_tx_work;
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struct work_struct mi_tm_rx_work;
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struct work_struct mi_tm_tx_work;
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struct work_struct tg_work;
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struct work_struct rf_work;
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struct list_head cmd_queue;
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struct pn533_cmd *cmd;
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u8 cmd_pending;
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struct mutex cmd_lock; /* protects cmd queue */
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void *cmd_complete_mi_arg;
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void *cmd_complete_dep_arg;
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struct pn533_poll_modulations *poll_mod_active[PN533_POLL_MOD_MAX + 1];
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u8 poll_mod_count;
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u8 poll_mod_curr;
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u8 poll_dep;
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u32 poll_protocols;
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u32 listen_protocols;
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struct timer_list listen_timer;
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int cancel_listen;
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u8 *gb;
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size_t gb_len;
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u8 tgt_available_prots;
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u8 tgt_active_prot;
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u8 tgt_mode;
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struct pn533_frame_ops *ops;
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struct device *dev;
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void *phy;
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struct pn533_phy_ops *phy_ops;
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};
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typedef int (*pn533_send_async_complete_t) (struct pn533 *dev, void *arg,
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struct sk_buff *resp);
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struct pn533_cmd {
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struct list_head queue;
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u8 code;
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int status;
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struct sk_buff *req;
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struct sk_buff *resp;
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pn533_send_async_complete_t complete_cb;
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void *complete_cb_context;
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};
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struct pn533_frame_ops {
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void (*tx_frame_init)(void *frame, u8 cmd_code);
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void (*tx_frame_finish)(void *frame);
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void (*tx_update_payload_len)(void *frame, int len);
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int tx_header_len;
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int tx_tail_len;
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bool (*rx_is_frame_valid)(void *frame, struct pn533 *dev);
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bool (*rx_frame_is_ack)(void *frame);
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int (*rx_frame_size)(void *frame);
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int rx_header_len;
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int rx_tail_len;
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int max_payload_len;
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u8 (*get_cmd_code)(void *frame);
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};
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struct pn533_phy_ops {
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int (*send_frame)(struct pn533 *priv,
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struct sk_buff *out);
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int (*send_ack)(struct pn533 *dev, gfp_t flags);
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void (*abort_cmd)(struct pn533 *priv, gfp_t flags);
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/*
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* dev_up and dev_down are optional.
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* They are used to inform the phy layer that the nfc chip
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* is going to be really used very soon. The phy layer can then
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* bring up it's interface to the chip and have it suspended for power
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* saving reasons otherwise.
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*/
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int (*dev_up)(struct pn533 *priv);
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int (*dev_down)(struct pn533 *priv);
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};
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struct pn533 *pn53x_common_init(u32 device_type,
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enum pn533_protocol_type protocol_type,
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void *phy,
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struct pn533_phy_ops *phy_ops,
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struct pn533_frame_ops *fops,
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struct device *dev);
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int pn533_finalize_setup(struct pn533 *dev);
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void pn53x_common_clean(struct pn533 *priv);
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void pn533_recv_frame(struct pn533 *dev, struct sk_buff *skb, int status);
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int pn532_i2c_nfc_alloc(struct pn533 *priv, u32 protocols,
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struct device *parent);
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int pn53x_register_nfc(struct pn533 *priv, u32 protocols,
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struct device *parent);
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void pn53x_unregister_nfc(struct pn533 *priv);
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bool pn533_rx_frame_is_cmd_response(struct pn533 *dev, void *frame);
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bool pn533_rx_frame_is_ack(void *_frame);
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