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Diffstat (limited to 'shortprint/shortprint.h')
| -rw-r--r-- | shortprint/shortprint.h | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/shortprint/shortprint.h b/shortprint/shortprint.h new file mode 100644 index 0000000..1531025 --- /dev/null +++ b/shortprint/shortprint.h @@ -0,0 +1,46 @@ +/* + * Useful info describing the parallel port device. + * + * Copyright (C) 2001 Alessandro Rubini and Jonathan Corbet + * Copyright (C) 2001 O'Reilly & Associates + * + * The source code in this file can be freely used, adapted, + * and redistributed in source or binary form, so long as an + * acknowledgment appears in derived source files. The citation + * should list that the code comes from the book "Linux Device + * Drivers" by Alessandro Rubini and Jonathan Corbet, published + * by O'Reilly & Associates. No warranty is attached; + * we cannot take responsibility for errors or fitness for use. + * + */ + +/* + * Register offsets + */ +#define SP_DATA 0x00 +#define SP_STATUS 0x01 +#define SP_CONTROL 0x02 +#define SP_NPORTS 3 + +/* + * Status register bits. + */ +#define SP_SR_BUSY 0x80 +#define SP_SR_ACK 0x40 +#define SP_SR_PAPER 0x20 +#define SP_SR_ONLINE 0x10 +#define SP_SR_ERR 0x08 + +/* + * Control register. + */ +#define SP_CR_IRQ 0x10 +#define SP_CR_SELECT 0x08 +#define SP_CR_INIT 0x04 +#define SP_CR_AUTOLF 0x02 +#define SP_CR_STROBE 0x01 + +/* + * Minimum space before waking up a writer. + */ +#define SP_MIN_SPACE PAGE_SIZE/2 |