1 | /* |
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2 | * linux/drivers/char/pc_keyb.c |
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3 | * Separation of the PC low-level part by Geert Uytterhoeven, May 1997 |
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4 | * See keyboard.c for the whole history. |
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5 | * Major cleanup by Martin Mares, May 1997 |
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6 | * Combined the keyboard and PS/2 mouse handling into one file, |
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7 | * because they share the same hardware. |
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8 | * Johan Myreen <jem@iki.fi> 1998-10-08. |
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9 | * Code fixes to handle mouse ACKs properly. |
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10 | * C. Scott Ananian <cananian@alumni.princeton.edu> 1999-01-29. |
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11 | * |
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12 | * RTEMS port: by Rosimildo da Silva. |
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13 | * This module was ported from Linux. |
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14 | * |
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15 | */ |
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16 | |
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17 | #include <stdlib.h> |
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18 | #include <stdio.h> |
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19 | #include <string.h> |
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20 | #include <errno.h> |
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21 | #include <sys/types.h> |
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22 | |
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23 | #include <bsp.h> |
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24 | #include <irq.h> |
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25 | #include <rtems/libio.h> |
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26 | #include <termios.h> |
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27 | #include <i386_io.h> |
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28 | #include <rtems/mw_uid.h> |
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29 | |
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30 | #define INITIALIZE_MOUSE |
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31 | /* Some configuration switches are present in the include file... */ |
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32 | #include "ps2_mouse.h" |
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33 | #include "mouse_parser.h" |
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34 | |
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35 | static void kbd_write_command_w(int data); |
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36 | static void kbd_write_output_w(int data); |
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37 | |
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38 | static unsigned char handle_kbd_event(void); |
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39 | |
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40 | /* used only by send_data - set by keyboard_interrupt */ |
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41 | static volatile unsigned char reply_expected = 0; |
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42 | static volatile unsigned char acknowledge = 0; |
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43 | static volatile unsigned char resend = 0; |
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44 | |
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45 | /* |
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46 | * PS/2 Auxiliary Device |
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47 | */ |
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48 | static int psaux_init(void); |
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49 | |
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50 | static struct aux_queue *queue; /* Mouse data buffer. */ |
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51 | static int aux_count = 0; |
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52 | /* used when we send commands to the mouse that expect an ACK. */ |
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53 | static unsigned char mouse_reply_expected = 0; |
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54 | |
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55 | #define AUX_INTS_OFF (KBD_MODE_KCC | KBD_MODE_DISABLE_MOUSE | KBD_MODE_SYS | KBD_MODE_KBD_INT) |
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56 | #define AUX_INTS_ON (KBD_MODE_KCC | KBD_MODE_SYS | KBD_MODE_MOUSE_INT | KBD_MODE_KBD_INT) |
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57 | #define MAX_RETRIES 60 /* some aux operations take long time*/ |
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58 | |
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59 | static void ps2_mouse_interrupt(); |
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60 | |
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61 | static void ( *driver_input_handler_ps2 )( void *, char *, int ) = 0; |
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62 | |
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63 | /* |
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64 | * This routine sets the handler to handle the characters received |
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65 | * from the serial port. |
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66 | */ |
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67 | void ps2_set_driver_handler( int port, void ( *handler )( void *, char *, int ) ) |
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68 | { |
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69 | driver_input_handler_ps2 = handler; |
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70 | } |
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71 | |
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72 | static void mdelay( unsigned long t ) |
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73 | { |
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74 | Wait_X_ms( t ); |
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75 | } |
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76 | |
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77 | |
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78 | static void* termios_ttyp_paux = NULL; |
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79 | |
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80 | static void |
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81 | isr_on(const rtems_irq_connect_data *unused) |
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82 | { |
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83 | return; |
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84 | } |
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85 | |
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86 | static void |
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87 | isr_off(const rtems_irq_connect_data *unused) |
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88 | { |
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89 | return; |
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90 | } |
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91 | |
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92 | static int isr_is_on(const rtems_irq_connect_data *irq) |
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93 | { |
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94 | return BSP_irq_enabled_at_i8259s( irq->name ); |
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95 | } |
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96 | |
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97 | |
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98 | static rtems_irq_connect_data ps2_isr_data = { AUX_IRQ, |
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99 | ps2_mouse_interrupt, isr_on, isr_off, isr_is_on }; |
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100 | |
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101 | |
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102 | /* |
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103 | * Wait for keyboard controller input buffer to drain. |
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104 | * |
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105 | * Don't use 'jiffies' so that we don't depend on |
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106 | * interrupts.. |
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107 | * |
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108 | * Quote from PS/2 System Reference Manual: |
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109 | * |
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110 | * "Address hex 0060 and address hex 0064 should be written only when |
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111 | * the input-buffer-full bit and output-buffer-full bit in the |
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112 | * Controller Status register are set 0." |
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113 | */ |
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114 | |
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115 | static void kb_wait(void) |
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116 | { |
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117 | unsigned long timeout = KBC_TIMEOUT; |
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118 | |
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119 | do { |
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120 | /* |
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121 | * "handle_kbd_event()" will handle any incoming events |
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122 | * while we wait - keypresses or mouse movement. |
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123 | */ |
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124 | unsigned char status = handle_kbd_event(); |
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125 | |
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126 | if (! (status & KBD_STAT_IBF)) |
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127 | return; |
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128 | |
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129 | mdelay(1); |
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130 | |
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131 | timeout--; |
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132 | } while (timeout); |
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133 | #ifdef KBD_REPORT_TIMEOUTS |
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134 | printk( "Keyboard timed out[1]\n"); |
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135 | #endif |
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136 | } |
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137 | |
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138 | static int do_acknowledge(unsigned char scancode) |
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139 | { |
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140 | if (reply_expected) { |
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141 | /* Unfortunately, we must recognise these codes only if we know they |
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142 | * are known to be valid (i.e., after sending a command), because there |
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143 | * are some brain-damaged keyboards (yes, FOCUS 9000 again) which have |
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144 | * keys with such codes :( |
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145 | */ |
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146 | if (scancode == KBD_REPLY_ACK) { |
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147 | acknowledge = 1; |
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148 | reply_expected = 0; |
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149 | return 0; |
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150 | } else if (scancode == KBD_REPLY_RESEND) { |
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151 | resend = 1; |
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152 | reply_expected = 0; |
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153 | return 0; |
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154 | } |
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155 | /* Should not happen... */ |
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156 | #if 0 |
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157 | printk( "keyboard reply expected - got %02x\n", |
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158 | scancode); |
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159 | #endif |
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160 | } |
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161 | return 1; |
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162 | } |
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163 | |
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164 | |
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165 | static inline void handle_mouse_event(unsigned char scancode) |
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166 | { |
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167 | if (mouse_reply_expected) { |
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168 | if (scancode == AUX_ACK) { |
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169 | mouse_reply_expected--; |
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170 | return; |
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171 | } |
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172 | mouse_reply_expected = 0; |
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173 | } |
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174 | |
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175 | if (aux_count) { |
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176 | int head = queue->head; |
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177 | |
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178 | queue->buf[head] = scancode; |
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179 | head = (head + 1) & (AUX_BUF_SIZE-1); |
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180 | if (head != queue->tail) { |
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181 | queue->head = head; |
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182 | } |
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183 | /* if the input queue is active, add to it */ |
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184 | if( driver_input_handler_ps2 ) |
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185 | { |
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186 | driver_input_handler_ps2( NULL, &scancode, 1 ); |
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187 | } |
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188 | else |
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189 | { |
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190 | /* post this byte to termios */ |
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191 | rtems_termios_enqueue_raw_characters( termios_ttyp_paux, &scancode, 1 ); |
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192 | } |
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193 | } |
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194 | } |
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195 | |
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196 | /* |
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197 | * This reads the keyboard status port, and does the |
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198 | * appropriate action. |
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199 | * |
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200 | * It requires that we hold the keyboard controller |
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201 | * spinlock. |
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202 | */ |
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203 | static unsigned char handle_kbd_event(void) |
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204 | { |
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205 | unsigned char status = kbd_read_status(); |
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206 | unsigned int work = 10000; |
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207 | |
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208 | while (status & KBD_STAT_OBF) { |
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209 | unsigned char scancode; |
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210 | |
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211 | scancode = kbd_read_input(); |
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212 | |
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213 | if (status & KBD_STAT_MOUSE_OBF) { |
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214 | handle_mouse_event(scancode); |
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215 | } else { |
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216 | do_acknowledge(scancode); |
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217 | printk("pc_keyb: %X ", scancode ); |
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218 | } |
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219 | status = kbd_read_status(); |
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220 | if(!work--) |
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221 | { |
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222 | printk("pc_keyb: controller jammed (0x%02X).\n", |
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223 | status); |
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224 | break; |
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225 | } |
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226 | } |
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227 | |
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228 | return status; |
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229 | } |
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230 | |
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231 | |
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232 | static void ps2_mouse_interrupt() |
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233 | { |
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234 | handle_kbd_event(); |
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235 | } |
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236 | |
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237 | /* |
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238 | * send_data sends a character to the keyboard and waits |
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239 | * for an acknowledge, possibly retrying if asked to. Returns |
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240 | * the success status. |
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241 | * |
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242 | * Don't use 'jiffies', so that we don't depend on interrupts |
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243 | */ |
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244 | static int send_data(unsigned char data) |
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245 | { |
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246 | int retries = 3; |
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247 | |
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248 | do { |
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249 | unsigned long timeout = KBD_TIMEOUT; |
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250 | |
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251 | acknowledge = 0; /* Set by interrupt routine on receipt of ACK. */ |
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252 | resend = 0; |
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253 | reply_expected = 1; |
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254 | kbd_write_output_w(data); |
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255 | for (;;) { |
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256 | if (acknowledge) |
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257 | return 1; |
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258 | if (resend) |
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259 | break; |
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260 | mdelay(1); |
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261 | if (!--timeout) { |
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262 | #ifdef KBD_REPORT_TIMEOUTS |
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263 | printk( "Keyboard timeout[2]\n"); |
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264 | #endif |
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265 | return 0; |
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266 | } |
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267 | } |
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268 | } while (retries-- > 0); |
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269 | #ifdef KBD_REPORT_TIMEOUTS |
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270 | printk( "keyboard: Too many NACKs -- noisy kbd cable?\n"); |
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271 | #endif |
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272 | return 0; |
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273 | } |
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274 | |
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275 | #define KBD_NO_DATA (-1) /* No data */ |
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276 | #define KBD_BAD_DATA (-2) /* Parity or other error */ |
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277 | |
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278 | static int kbd_read_data(void) |
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279 | { |
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280 | int retval = KBD_NO_DATA; |
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281 | unsigned char status; |
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282 | |
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283 | status = kbd_read_status(); |
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284 | if (status & KBD_STAT_OBF) { |
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285 | unsigned char data = kbd_read_input(); |
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286 | |
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287 | retval = data; |
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288 | if (status & (KBD_STAT_GTO | KBD_STAT_PERR)) |
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289 | retval = KBD_BAD_DATA; |
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290 | } |
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291 | return retval; |
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292 | } |
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293 | |
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294 | static void kbd_clear_input(void) |
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295 | { |
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296 | int maxread = 100; /* Random number */ |
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297 | |
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298 | do { |
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299 | if (kbd_read_data() == KBD_NO_DATA) |
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300 | break; |
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301 | } while (--maxread); |
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302 | } |
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303 | |
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304 | static int kbd_wait_for_input(void) |
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305 | { |
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306 | long timeout = KBD_INIT_TIMEOUT; |
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307 | |
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308 | do { |
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309 | int retval = kbd_read_data(); |
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310 | if (retval >= 0) |
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311 | return retval; |
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312 | mdelay(1); |
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313 | } while (--timeout); |
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314 | return -1; |
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315 | } |
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316 | |
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317 | static void kbd_write_command_w(int data) |
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318 | { |
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319 | kb_wait(); |
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320 | kbd_write_command(data); |
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321 | } |
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322 | |
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323 | static void kbd_write_output_w(int data) |
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324 | { |
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325 | kb_wait(); |
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326 | kbd_write_output(data); |
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327 | } |
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328 | |
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329 | static void kbd_write_cmd(int cmd) |
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330 | { |
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331 | kb_wait(); |
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332 | kbd_write_command(KBD_CCMD_WRITE_MODE); |
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333 | kb_wait(); |
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334 | kbd_write_output(cmd); |
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335 | } |
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336 | |
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337 | /* |
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338 | * Check if this is a dual port controller. |
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339 | */ |
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340 | static int detect_auxiliary_port(void) |
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341 | { |
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342 | int loops = 10; |
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343 | int retval = 0; |
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344 | |
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345 | /* Put the value 0x5A in the output buffer using the "Write |
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346 | * Auxiliary Device Output Buffer" command (0xD3). Poll the |
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347 | * Status Register for a while to see if the value really |
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348 | * turns up in the Data Register. If the KBD_STAT_MOUSE_OBF |
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349 | * bit is also set to 1 in the Status Register, we assume this |
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350 | * controller has an Auxiliary Port (a.k.a. Mouse Port). |
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351 | */ |
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352 | kb_wait(); |
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353 | kbd_write_command(KBD_CCMD_WRITE_AUX_OBUF); |
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354 | |
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355 | kb_wait(); |
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356 | kbd_write_output(0x5a); /* 0x5a is a random dummy value. */ |
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357 | |
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358 | do { |
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359 | unsigned char status = kbd_read_status(); |
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360 | |
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361 | if (status & KBD_STAT_OBF) { |
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362 | (void) kbd_read_input(); |
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363 | if (status & KBD_STAT_MOUSE_OBF) { |
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364 | printk( "Detected PS/2 Mouse Port.\n"); |
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365 | retval = 1; |
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366 | } |
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367 | break; |
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368 | } |
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369 | mdelay(1); |
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370 | } while (--loops); |
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371 | return retval; |
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372 | } |
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373 | |
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374 | /* |
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375 | * Send a byte to the mouse. |
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376 | */ |
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377 | static void aux_write_dev(int val) |
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378 | { |
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379 | kb_wait(); |
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380 | kbd_write_command(KBD_CCMD_WRITE_MOUSE); |
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381 | kb_wait(); |
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382 | kbd_write_output(val); |
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383 | } |
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384 | |
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385 | /* |
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386 | * Send a byte to the mouse & handle returned ack |
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387 | */ |
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388 | static void aux_write_ack(int val) |
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389 | { |
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390 | kb_wait(); |
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391 | kbd_write_command(KBD_CCMD_WRITE_MOUSE); |
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392 | kb_wait(); |
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393 | kbd_write_output(val); |
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394 | /* we expect an ACK in response. */ |
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395 | mouse_reply_expected++; |
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396 | kb_wait(); |
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397 | } |
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398 | |
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399 | static unsigned char get_from_queue(void) |
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400 | { |
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401 | unsigned char result; |
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402 | result = queue->buf[queue->tail]; |
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403 | queue->tail = (queue->tail + 1) & (AUX_BUF_SIZE-1); |
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404 | return result; |
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405 | } |
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406 | |
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407 | |
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408 | static int queue_empty(void) |
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409 | { |
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410 | return queue->head == queue->tail; |
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411 | } |
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412 | |
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413 | /* |
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414 | * Random magic cookie for the aux device |
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415 | */ |
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416 | #define AUX_DEV ((void *)queue) |
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417 | |
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418 | static int release_aux() |
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419 | { |
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420 | if (--aux_count) |
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421 | return 0; |
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422 | kbd_write_cmd(AUX_INTS_OFF); /* Disable controller ints */ |
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423 | kbd_write_command_w(KBD_CCMD_MOUSE_DISABLE); |
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424 | |
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425 | BSP_remove_rtems_irq_handler( &ps2_isr_data ); |
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426 | return 0; |
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427 | } |
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428 | /* |
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429 | * Install interrupt handler. |
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430 | * Enable auxiliary device. |
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431 | */ |
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432 | |
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433 | static int open_aux() |
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434 | { |
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435 | rtems_status_code status; |
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436 | |
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437 | if (aux_count++) { |
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438 | return 0; |
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439 | } |
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440 | queue->head = queue->tail = 0; /* Flush input queue */ |
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441 | |
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442 | |
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443 | status = BSP_install_rtems_irq_handler( &ps2_isr_data ); |
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444 | if( !status ) |
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445 | { |
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446 | printk("Error installing ps2-mouse interrupt handler!\n" ); |
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447 | rtems_fatal_error_occurred( status ); |
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448 | } |
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449 | |
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450 | kbd_write_command_w(KBD_CCMD_MOUSE_ENABLE); /* Enable the |
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451 | auxiliary port on |
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452 | controller. */ |
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453 | aux_write_ack(AUX_ENABLE_DEV); /* Enable aux device */ |
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454 | kbd_write_cmd(AUX_INTS_ON); /* Enable controller ints */ |
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455 | return 0; |
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456 | } |
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457 | |
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458 | /* |
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459 | * Put bytes from input queue to buffer. |
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460 | */ |
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461 | size_t read_aux(char * buffer, size_t count ) |
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462 | { |
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463 | size_t i = count; |
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464 | unsigned char c; |
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465 | |
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466 | if (queue_empty()) |
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467 | { |
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468 | return 0; |
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469 | } |
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470 | while (i > 0 && !queue_empty()) |
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471 | { |
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472 | c = get_from_queue(); |
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473 | *buffer++ = c; |
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474 | i--; |
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475 | } |
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476 | return count-i; |
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477 | } |
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478 | |
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479 | /* |
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480 | * Write to the aux device. |
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481 | */ |
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482 | |
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483 | static int write_aux( int minor, const char * buffer, int count ) |
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484 | { |
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485 | int retval = 0; |
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486 | |
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487 | if (count) { |
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488 | int written = 0; |
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489 | |
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490 | if (count > 32) |
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491 | count = 32; /* Limit to 32 bytes. */ |
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492 | do { |
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493 | char c; |
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494 | c = *buffer++; |
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495 | aux_write_dev(c); |
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496 | written++; |
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497 | } while (--count); |
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498 | retval = -EIO; |
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499 | if (written) { |
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500 | retval = written; |
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501 | } |
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502 | } |
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503 | return retval; |
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504 | } |
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505 | |
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506 | static unsigned int aux_poll() |
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507 | { |
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508 | if( !queue_empty() ) |
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509 | return 1; |
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510 | return 0; |
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511 | } |
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512 | |
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513 | static int psaux_init( void ) |
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514 | { |
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515 | if( !detect_auxiliary_port() ) |
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516 | { |
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517 | printk( "PS/2 - mouse not found.\n" ); |
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518 | return -EIO; |
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519 | } |
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520 | |
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521 | queue = (struct aux_queue *)malloc( sizeof(*queue) ); |
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522 | memset(queue, 0, sizeof(*queue)); |
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523 | queue->head = queue->tail = 0; |
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524 | queue->proc_list = NULL; |
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525 | |
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526 | #ifdef INITIALIZE_MOUSE |
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527 | kbd_write_command_w(KBD_CCMD_MOUSE_ENABLE); /* Enable Aux. */ |
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528 | aux_write_ack(AUX_SET_SAMPLE); |
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529 | aux_write_ack(100); /* 100 samples/sec */ |
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530 | aux_write_ack(AUX_SET_RES); |
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531 | aux_write_ack(3); /* 8 counts per mm */ |
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532 | aux_write_ack(AUX_SET_SCALE21); /* 2:1 scaling */ |
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533 | #endif /* INITIALIZE_MOUSE */ |
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534 | kbd_write_command(KBD_CCMD_MOUSE_DISABLE); /* Disable aux device. */ |
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535 | kbd_write_cmd(AUX_INTS_OFF); /* Disable controller ints. */ |
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536 | return 0; |
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537 | } |
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538 | |
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539 | void paux_reserve_resources(rtems_configuration_table *conf) |
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540 | { |
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541 | rtems_termios_reserve_resources(conf, 1); |
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542 | return; |
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543 | } |
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544 | |
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545 | /* |
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546 | * paux device driver INITIALIZE entry point. |
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547 | */ |
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548 | rtems_device_driver |
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549 | paux_initialize( rtems_device_major_number major, |
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550 | rtems_device_minor_number minor, |
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551 | void *arg) |
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552 | { |
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553 | rtems_status_code status; |
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554 | |
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555 | /* |
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556 | * Set up TERMIOS |
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557 | */ |
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558 | rtems_termios_initialize(); |
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559 | |
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560 | printk( "PS/2 mouse probe.\n" ); |
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561 | if( psaux_init() < 0 ) |
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562 | { |
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563 | printk("Error detecting PS/2 mouse --\n"); |
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564 | |
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565 | /* we might want to finish the application here !!! */ |
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566 | } |
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567 | open_aux(); |
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568 | |
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569 | /* |
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570 | * Register the device |
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571 | */ |
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572 | status = rtems_io_register_name ("/dev/mouse", major, 0); |
---|
573 | if (status != RTEMS_SUCCESSFUL) |
---|
574 | { |
---|
575 | printk("Error registering paux device!\n"); |
---|
576 | rtems_fatal_error_occurred (status); |
---|
577 | } |
---|
578 | return RTEMS_SUCCESSFUL; |
---|
579 | } /* tty_initialize */ |
---|
580 | |
---|
581 | |
---|
582 | static int paux_last_close(int major, int minor, void *arg) |
---|
583 | { |
---|
584 | release_aux(); |
---|
585 | return 0; |
---|
586 | } |
---|
587 | |
---|
588 | /* |
---|
589 | * Write to the aux device. This routine is invoked by the |
---|
590 | * termios framework whenever the "ECHO" feature is on. |
---|
591 | * It does nothing write now. |
---|
592 | */ |
---|
593 | static int write_aux_echo( int minor, const char * buffer, int count ) |
---|
594 | { |
---|
595 | return 0; |
---|
596 | } |
---|
597 | |
---|
598 | |
---|
599 | /* |
---|
600 | * Some initialization if necessary |
---|
601 | */ |
---|
602 | static rtems_device_driver |
---|
603 | paux_first_open( rtems_device_minor_number major, |
---|
604 | rtems_device_minor_number minor, |
---|
605 | void *arg) |
---|
606 | { |
---|
607 | return RTEMS_SUCCESSFUL; |
---|
608 | } |
---|
609 | |
---|
610 | |
---|
611 | /* |
---|
612 | * paux device driver OPEN entry point |
---|
613 | */ |
---|
614 | rtems_device_driver |
---|
615 | paux_open(rtems_device_major_number major, |
---|
616 | rtems_device_minor_number minor, |
---|
617 | void *arg) |
---|
618 | { |
---|
619 | rtems_status_code status; |
---|
620 | static rtems_termios_callbacks cb = |
---|
621 | { |
---|
622 | NULL, /* firstOpen */ |
---|
623 | paux_last_close, /* lastClose */ |
---|
624 | NULL, /* poll read */ |
---|
625 | write_aux_echo, /* write */ |
---|
626 | NULL, /* setAttributes */ |
---|
627 | NULL, /* stopRemoteTx */ |
---|
628 | NULL, /* startRemoteTx */ |
---|
629 | 0 /* outputUsesInterrupts */ |
---|
630 | }; |
---|
631 | |
---|
632 | status = rtems_termios_open (major, minor, arg, &cb ); |
---|
633 | termios_ttyp_paux = ( (rtems_libio_open_close_args_t *)arg)->iop->data1; |
---|
634 | return status; |
---|
635 | } |
---|
636 | |
---|
637 | /* |
---|
638 | * paux device driver CLOSE entry point |
---|
639 | */ |
---|
640 | rtems_device_driver |
---|
641 | paux_close(rtems_device_major_number major, |
---|
642 | rtems_device_minor_number minor, |
---|
643 | void *arg) |
---|
644 | { |
---|
645 | return (rtems_termios_close (arg)); |
---|
646 | } |
---|
647 | |
---|
648 | |
---|
649 | /* |
---|
650 | * paux device driver READ entry point. |
---|
651 | * Read characters from the PS/2 mouse. |
---|
652 | */ |
---|
653 | rtems_device_driver |
---|
654 | paux_read(rtems_device_major_number major, |
---|
655 | rtems_device_minor_number minor, |
---|
656 | void *arg) |
---|
657 | { |
---|
658 | return rtems_termios_read (arg); |
---|
659 | } /* tty_read */ |
---|
660 | |
---|
661 | |
---|
662 | /* |
---|
663 | * paux device driver WRITE entry point. |
---|
664 | * Write characters to the PS/2 mouse. |
---|
665 | */ |
---|
666 | rtems_device_driver |
---|
667 | paux_write(rtems_device_major_number major, |
---|
668 | rtems_device_minor_number minor, |
---|
669 | void * arg) |
---|
670 | { |
---|
671 | rtems_libio_rw_args_t *rw_args = (rtems_libio_rw_args_t *)arg; |
---|
672 | char *buffer = rw_args->buffer; |
---|
673 | int maximum = rw_args->count; |
---|
674 | rw_args->bytes_moved = write_aux( minor, buffer, maximum ); |
---|
675 | return RTEMS_SUCCESSFUL; |
---|
676 | } /* tty_write */ |
---|
677 | |
---|
678 | |
---|
679 | /* |
---|
680 | * Handle ioctl request. |
---|
681 | */ |
---|
682 | rtems_device_driver |
---|
683 | paux_control(rtems_device_major_number major, |
---|
684 | rtems_device_minor_number minor, |
---|
685 | void * arg |
---|
686 | ) |
---|
687 | { |
---|
688 | rtems_libio_ioctl_args_t *args = arg; |
---|
689 | switch( args->command ) |
---|
690 | { |
---|
691 | default: |
---|
692 | return rtems_termios_ioctl (arg); |
---|
693 | break; |
---|
694 | |
---|
695 | case MW_UID_REGISTER_DEVICE: |
---|
696 | printk( "PS2 Mouse: reg=%s\n", args->buffer ); |
---|
697 | register_mou_msg_queue( args->buffer, -1 ); |
---|
698 | break; |
---|
699 | |
---|
700 | case MW_UID_UNREGISTER_DEVICE: |
---|
701 | unregister_mou_msg_queue( -1 ); |
---|
702 | break; |
---|
703 | } |
---|
704 | args->ioctl_return = 0; |
---|
705 | return RTEMS_SUCCESSFUL; |
---|
706 | } |
---|
707 | |
---|
708 | |
---|
709 | |
---|