2024年6月6日发(作者：)

50 {

51 *write_ptr = data;

52 write_ptr++;

53 if (write_ptr >= buf + BUF_SIZE)

54 write_ptr = buf;

55 }

56

57 static void serial_in(char *data)

58 {

59 if (read_ptr == NULL) {

60 DBG("pointer is null !n");

61 }

62

63 if (read_ptr && (read_ptr != write_ptr)) {

64 *data = *read_ptr;

65 read_ptr++;

66 if(read_ptr >= buf + BUF_SIZE)

67 read_ptr = buf;

68 }

69 }

70

71

72 static void tiny_stop_tx(struct uart_port *port)

73 {

74 DBG("tiny_stop_tx()n");

75 }

76

77 static void tiny_stop_rx(struct uart_port *port)

78 {

79 DBG("tiny_stop_rx()n");

80 }

81

82 static void tiny_enable_ms(struct uart_port *port)

83 {

84 DBG("tiny_enable_ms()n");

85 }

86

87 static void tiny_rx_chars(struct uart_port *port, int size)

88 {

89 int i = 0;

90 char byte;

91 char flag;

92 struct tty_port *tty = &port->state->port;

93

94 if (size <= 0) {

95 return;

96 }

97

98 while (size--) {

99 serial_in(&byte);

100 DBG("read: 0x%2xn", byte);

101 flag = TTY_NORMAL;

102 port->++;

103

104 if (uart_handle_sysrq_char(port, byte)) {

105 DBG("found ignore char !n");

106 goto ignore_char;

107 }

108

109 uart_insert_char(port, 0, 0, byte, flag);

110 ignore_char:

111 i ++;

112 }

113 tty_flip_buffer_push(tty);

114 DBG("push to user space !n");

115 }

116

117 static int tiny_tx_chars(struct uart_port *port)

118 {

119 struct circ_buf *xmit = &port->state->xmit;

120 int count;

121

122 DBG("tiny_tx_chars()n");

123

124 if (port->x_char) {

125 DBG("wrote 0x%2xrn", port->x_char);

126 port->++;

127 port->x_char = 0;

128 return;

129 }

130 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {

131 tiny_stop_tx(port);

132 return;

133 }