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422 | giacomo | 1 | #ifndef _LINUX_LP_H |
2 | #define _LINUX_LP_H |
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3 | |||
4 | /* |
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5 | * usr/include/linux/lp.h c.1991-1992 James Wiegand |
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6 | * many modifications copyright (C) 1992 Michael K. Johnson |
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7 | * Interrupt support added 1993 Nigel Gamble |
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8 | * Removed 8255 status defines from inside __KERNEL__ Marcelo Tosatti |
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9 | */ |
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10 | |||
11 | /* |
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12 | * Per POSIX guidelines, this module reserves the LP and lp prefixes |
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13 | * These are the lp_table[minor].flags flags... |
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14 | */ |
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15 | #define LP_EXIST 0x0001 |
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16 | #define LP_SELEC 0x0002 |
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17 | #define LP_BUSY 0x0004 |
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18 | #define LP_BUSY_BIT_POS 2 |
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19 | #define LP_OFFL 0x0008 |
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20 | #define LP_NOPA 0x0010 |
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21 | #define LP_ERR 0x0020 |
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22 | #define LP_ABORT 0x0040 |
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23 | #define LP_CAREFUL 0x0080 /* obsoleted -arca */ |
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24 | #define LP_ABORTOPEN 0x0100 |
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25 | |||
26 | #define LP_TRUST_IRQ_ 0x0200 /* obsolete */ |
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27 | #define LP_NO_REVERSE 0x0400 /* No reverse mode available. */ |
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28 | #define LP_DATA_AVAIL 0x0800 /* Data is available. */ |
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29 | |||
30 | /* |
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31 | * bit defines for 8255 status port |
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32 | * base + 1 |
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33 | * accessed with LP_S(minor), which gets the byte... |
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34 | */ |
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35 | #define LP_PBUSY 0x80 /* inverted input, active high */ |
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36 | #define LP_PACK 0x40 /* unchanged input, active low */ |
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37 | #define LP_POUTPA 0x20 /* unchanged input, active high */ |
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38 | #define LP_PSELECD 0x10 /* unchanged input, active high */ |
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39 | #define LP_PERRORP 0x08 /* unchanged input, active low */ |
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40 | |||
41 | /* timeout for each character. This is relative to bus cycles -- it |
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42 | * is the count in a busy loop. THIS IS THE VALUE TO CHANGE if you |
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43 | * have extremely slow printing, or if the machine seems to slow down |
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44 | * a lot when you print. If you have slow printing, increase this |
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45 | * number and recompile, and if your system gets bogged down, decrease |
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46 | * this number. This can be changed with the tunelp(8) command as well. |
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47 | */ |
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48 | |||
49 | #define LP_INIT_CHAR 1000 |
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50 | |||
51 | /* The parallel port specs apparently say that there needs to be |
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52 | * a .5usec wait before and after the strobe. |
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53 | */ |
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54 | |||
55 | #define LP_INIT_WAIT 1 |
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56 | |||
57 | /* This is the amount of time that the driver waits for the printer to |
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58 | * catch up when the printer's buffer appears to be filled. If you |
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59 | * want to tune this and have a fast printer (i.e. HPIIIP), decrease |
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60 | * this number, and if you have a slow printer, increase this number. |
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61 | * This is in hundredths of a second, the default 2 being .05 second. |
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62 | * Or use the tunelp(8) command, which is especially nice if you want |
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63 | * change back and forth between character and graphics printing, which |
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64 | * are wildly different... |
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65 | */ |
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66 | |||
67 | #define LP_INIT_TIME 2 |
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68 | |||
69 | /* IOCTL numbers */ |
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70 | #define LPCHAR 0x0601 /* corresponds to LP_INIT_CHAR */ |
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71 | #define LPTIME 0x0602 /* corresponds to LP_INIT_TIME */ |
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72 | #define LPABORT 0x0604 /* call with TRUE arg to abort on error, |
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73 | FALSE to retry. Default is retry. */ |
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74 | #define LPSETIRQ 0x0605 /* call with new IRQ number, |
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75 | or 0 for polling (no IRQ) */ |
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76 | #define LPGETIRQ 0x0606 /* get the current IRQ number */ |
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77 | #define LPWAIT 0x0608 /* corresponds to LP_INIT_WAIT */ |
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78 | /* NOTE: LPCAREFUL is obsoleted and it' s always the default right now -arca */ |
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79 | #define LPCAREFUL 0x0609 /* call with TRUE arg to require out-of-paper, off- |
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80 | line, and error indicators good on all writes, |
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81 | FALSE to ignore them. Default is ignore. */ |
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82 | #define LPABORTOPEN 0x060a /* call with TRUE arg to abort open() on error, |
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83 | FALSE to ignore error. Default is ignore. */ |
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84 | #define LPGETSTATUS 0x060b /* return LP_S(minor) */ |
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85 | #define LPRESET 0x060c /* reset printer */ |
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86 | #ifdef LP_STATS |
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87 | #define LPGETSTATS 0x060d /* get statistics (struct lp_stats) */ |
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88 | #endif |
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89 | #define LPGETFLAGS 0x060e /* get status flags */ |
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90 | #define LPSETTIMEOUT 0x060f /* set parport timeout */ |
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91 | |||
92 | /* timeout for printk'ing a timeout, in jiffies (100ths of a second). |
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93 | This is also used for re-checking error conditions if LP_ABORT is |
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94 | not set. This is the default behavior. */ |
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95 | |||
96 | #define LP_TIMEOUT_INTERRUPT (60 * HZ) |
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97 | #define LP_TIMEOUT_POLLED (10 * HZ) |
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98 | |||
99 | #ifdef __KERNEL__ |
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100 | |||
101 | #include <linux/wait.h> |
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102 | #include <asm/semaphore.h> |
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103 | |||
104 | /* Magic numbers for defining port-device mappings */ |
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105 | #define LP_PARPORT_UNSPEC -4 |
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106 | #define LP_PARPORT_AUTO -3 |
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107 | #define LP_PARPORT_OFF -2 |
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108 | #define LP_PARPORT_NONE -1 |
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109 | |||
110 | #define LP_F(minor) lp_table[(minor)].flags /* flags for busy, etc. */ |
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111 | #define LP_CHAR(minor) lp_table[(minor)].chars /* busy timeout */ |
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112 | #define LP_TIME(minor) lp_table[(minor)].time /* wait time */ |
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113 | #define LP_WAIT(minor) lp_table[(minor)].wait /* strobe wait */ |
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114 | #define LP_IRQ(minor) lp_table[(minor)].dev->port->irq /* interrupt # */ |
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115 | /* PARPORT_IRQ_NONE means polled */ |
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116 | #ifdef LP_STATS |
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117 | #define LP_STAT(minor) lp_table[(minor)].stats /* statistics area */ |
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118 | #endif |
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119 | #define LP_BUFFER_SIZE PAGE_SIZE |
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120 | |||
121 | #define LP_BASE(x) lp_table[(x)].dev->port->base |
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122 | |||
123 | #ifdef LP_STATS |
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124 | struct lp_stats { |
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125 | unsigned long chars; |
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126 | unsigned long sleeps; |
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127 | unsigned int maxrun; |
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128 | unsigned int maxwait; |
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129 | unsigned int meanwait; |
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130 | unsigned int mdev; |
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131 | }; |
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132 | #endif |
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133 | |||
134 | struct lp_struct { |
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135 | struct pardevice *dev; |
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136 | unsigned long flags; |
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137 | unsigned int chars; |
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138 | unsigned int time; |
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139 | unsigned int wait; |
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140 | char *lp_buffer; |
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141 | #ifdef LP_STATS |
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142 | unsigned int lastcall; |
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143 | unsigned int runchars; |
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144 | struct lp_stats stats; |
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145 | #endif |
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146 | wait_queue_head_t waitq; |
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147 | unsigned int last_error; |
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148 | struct semaphore port_mutex; |
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149 | wait_queue_head_t dataq; |
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150 | long timeout; |
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151 | unsigned int best_mode; |
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152 | unsigned int current_mode; |
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153 | unsigned long bits; |
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154 | }; |
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155 | |||
156 | /* |
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157 | * The following constants describe the various signals of the printer port |
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158 | * hardware. Note that the hardware inverts some signals and that some |
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159 | * signals are active low. An example is LP_STROBE, which must be programmed |
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160 | * with 1 for being active and 0 for being inactive, because the strobe signal |
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161 | * gets inverted, but it is also active low. |
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162 | */ |
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163 | |||
164 | |||
165 | /* |
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166 | * defines for 8255 control port |
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167 | * base + 2 |
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168 | * accessed with LP_C(minor) |
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169 | */ |
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170 | #define LP_PINTEN 0x10 /* high to read data in or-ed with data out */ |
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171 | #define LP_PSELECP 0x08 /* inverted output, active low */ |
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172 | #define LP_PINITP 0x04 /* unchanged output, active low */ |
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173 | #define LP_PAUTOLF 0x02 /* inverted output, active low */ |
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174 | #define LP_PSTROBE 0x01 /* short high output on raising edge */ |
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175 | |||
176 | /* |
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177 | * the value written to ports to test existence. PC-style ports will |
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178 | * return the value written. AT-style ports will return 0. so why not |
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179 | * make them the same ? |
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180 | */ |
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181 | #define LP_DUMMY 0x00 |
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182 | |||
183 | /* |
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184 | * This is the port delay time, in microseconds. |
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185 | * It is used only in the lp_init() and lp_reset() routine. |
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186 | */ |
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187 | #define LP_DELAY 50 |
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188 | |||
189 | /* |
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190 | * function prototypes |
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191 | */ |
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192 | |||
193 | extern int lp_init(void); |
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194 | |||
195 | #endif |
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196 | |||
197 | #endif |