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570 lines
14 KiB
570 lines
14 KiB
/* |
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* Atari Keyboard driver for 680x0 Linux |
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* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file COPYING in the main directory of this archive |
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* for more details. |
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*/ |
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|
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/* |
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* Atari support by Robert de Vries |
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* enhanced by Bjoern Brauel and Roman Hodek |
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* |
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* 2.6 and input cleanup (removed autorepeat stuff) for 2.6.21 |
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* 06/07 Michael Schmitz |
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*/ |
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#include <linux/module.h> |
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#include <linux/sched.h> |
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#include <linux/kernel.h> |
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#include <linux/interrupt.h> |
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#include <linux/errno.h> |
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#include <linux/keyboard.h> |
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#include <linux/delay.h> |
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#include <linux/timer.h> |
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#include <linux/kd.h> |
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#include <linux/random.h> |
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#include <linux/init.h> |
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#include <linux/kbd_kern.h> |
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#include <asm/atariints.h> |
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#include <asm/atarihw.h> |
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#include <asm/atarikb.h> |
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#include <asm/atari_joystick.h> |
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#include <asm/irq.h> |
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/* Hook for MIDI serial driver */ |
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void (*atari_MIDI_interrupt_hook) (void); |
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/* Hook for keyboard inputdev driver */ |
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void (*atari_input_keyboard_interrupt_hook) (unsigned char, char); |
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/* Hook for mouse inputdev driver */ |
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void (*atari_input_mouse_interrupt_hook) (char *); |
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EXPORT_SYMBOL(atari_input_keyboard_interrupt_hook); |
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EXPORT_SYMBOL(atari_input_mouse_interrupt_hook); |
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/* variables for IKBD self test: */ |
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/* state: 0: off; >0: in progress; >1: 0xf1 received */ |
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static volatile int ikbd_self_test; |
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/* timestamp when last received a char */ |
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static volatile unsigned long self_test_last_rcv; |
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/* bitmap of keys reported as broken */ |
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static unsigned long broken_keys[128/(sizeof(unsigned long)*8)] = { 0, }; |
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#define BREAK_MASK (0x80) |
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|
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/* |
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* ++roman: The following changes were applied manually: |
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* |
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* - The Alt (= Meta) key works in combination with Shift and |
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* Control, e.g. Alt+Shift+a sends Meta-A (0xc1), Alt+Control+A sends |
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* Meta-Ctrl-A (0x81) ... |
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* |
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* - The parentheses on the keypad send '(' and ')' with all |
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* modifiers (as would do e.g. keypad '+'), but they cannot be used as |
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* application keys (i.e. sending Esc O c). |
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* |
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* - HELP and UNDO are mapped to be F21 and F24, resp, that send the |
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* codes "\E[M" and "\E[P". (This is better than the old mapping to |
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* F11 and F12, because these codes are on Shift+F1/2 anyway.) This |
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* way, applications that allow their own keyboard mappings |
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* (e.g. tcsh, X Windows) can be configured to use them in the way |
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* the label suggests (providing help or undoing). |
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* |
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* - Console switching is done with Alt+Fx (consoles 1..10) and |
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* Shift+Alt+Fx (consoles 11..20). |
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* |
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* - The misc. special function implemented in the kernel are mapped |
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* to the following key combinations: |
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* |
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* ClrHome -> Home/Find |
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* Shift + ClrHome -> End/Select |
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* Shift + Up -> Page Up |
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* Shift + Down -> Page Down |
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* Alt + Help -> show system status |
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* Shift + Help -> show memory info |
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* Ctrl + Help -> show registers |
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* Ctrl + Alt + Del -> Reboot |
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* Alt + Undo -> switch to last console |
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* Shift + Undo -> send interrupt |
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* Alt + Insert -> stop/start output (same as ^S/^Q) |
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* Alt + Up -> Scroll back console (if implemented) |
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* Alt + Down -> Scroll forward console (if implemented) |
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* Alt + CapsLock -> NumLock |
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* |
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* ++Andreas: |
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* |
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* - Help mapped to K_HELP |
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* - Undo mapped to K_UNDO (= K_F246) |
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* - Keypad Left/Right Parenthesis mapped to new K_PPAREN[LR] |
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*/ |
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typedef enum kb_state_t { |
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KEYBOARD, AMOUSE, RMOUSE, JOYSTICK, CLOCK, RESYNC |
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} KB_STATE_T; |
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#define IS_SYNC_CODE(sc) ((sc) >= 0x04 && (sc) <= 0xfb) |
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typedef struct keyboard_state { |
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unsigned char buf[6]; |
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int len; |
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KB_STATE_T state; |
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} KEYBOARD_STATE; |
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KEYBOARD_STATE kb_state; |
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/* ++roman: If a keyboard overrun happened, we can't tell in general how much |
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* bytes have been lost and in which state of the packet structure we are now. |
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* This usually causes keyboards bytes to be interpreted as mouse movements |
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* and vice versa, which is very annoying. It seems better to throw away some |
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* bytes (that are usually mouse bytes) than to misinterpret them. Therefore I |
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* introduced the RESYNC state for IKBD data. In this state, the bytes up to |
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* one that really looks like a key event (0x04..0xf2) or the start of a mouse |
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* packet (0xf8..0xfb) are thrown away, but at most 2 bytes. This at least |
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* speeds up the resynchronization of the event structure, even if maybe a |
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* mouse movement is lost. However, nothing is perfect. For bytes 0x01..0x03, |
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* it's really hard to decide whether they're mouse or keyboard bytes. Since |
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* overruns usually occur when moving the Atari mouse rapidly, they're seen as |
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* mouse bytes here. If this is wrong, only a make code of the keyboard gets |
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* lost, which isn't too bad. Losing a break code would be disastrous, |
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* because then the keyboard repeat strikes... |
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*/ |
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static irqreturn_t atari_keyboard_interrupt(int irq, void *dummy) |
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{ |
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u_char acia_stat; |
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int scancode; |
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int break_flag; |
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repeat: |
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if (acia.mid_ctrl & ACIA_IRQ) |
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if (atari_MIDI_interrupt_hook) |
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atari_MIDI_interrupt_hook(); |
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acia_stat = acia.key_ctrl; |
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/* check out if the interrupt came from this ACIA */ |
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if (!((acia_stat | acia.mid_ctrl) & ACIA_IRQ)) |
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return IRQ_HANDLED; |
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if (acia_stat & ACIA_OVRN) { |
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/* a very fast typist or a slow system, give a warning */ |
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/* ...happens often if interrupts were disabled for too long */ |
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pr_debug("Keyboard overrun\n"); |
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scancode = acia.key_data; |
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if (ikbd_self_test) |
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/* During self test, don't do resyncing, just process the code */ |
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goto interpret_scancode; |
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else if (IS_SYNC_CODE(scancode)) { |
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/* This code seem already to be the start of a new packet or a |
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* single scancode */ |
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kb_state.state = KEYBOARD; |
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goto interpret_scancode; |
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} else { |
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/* Go to RESYNC state and skip this byte */ |
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kb_state.state = RESYNC; |
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kb_state.len = 1; /* skip max. 1 another byte */ |
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goto repeat; |
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} |
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} |
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if (acia_stat & ACIA_RDRF) { |
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/* received a character */ |
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scancode = acia.key_data; /* get it or reset the ACIA, I'll get it! */ |
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interpret_scancode: |
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switch (kb_state.state) { |
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case KEYBOARD: |
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switch (scancode) { |
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case 0xF7: |
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kb_state.state = AMOUSE; |
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kb_state.len = 0; |
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break; |
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case 0xF8: |
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case 0xF9: |
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case 0xFA: |
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case 0xFB: |
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kb_state.state = RMOUSE; |
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kb_state.len = 1; |
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kb_state.buf[0] = scancode; |
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break; |
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case 0xFC: |
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kb_state.state = CLOCK; |
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kb_state.len = 0; |
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break; |
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case 0xFE: |
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case 0xFF: |
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kb_state.state = JOYSTICK; |
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kb_state.len = 1; |
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kb_state.buf[0] = scancode; |
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break; |
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case 0xF1: |
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/* during self-test, note that 0xf1 received */ |
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if (ikbd_self_test) { |
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++ikbd_self_test; |
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self_test_last_rcv = jiffies; |
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break; |
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} |
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fallthrough; |
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default: |
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break_flag = scancode & BREAK_MASK; |
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scancode &= ~BREAK_MASK; |
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if (ikbd_self_test) { |
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/* Scancodes sent during the self-test stand for broken |
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* keys (keys being down). The code *should* be a break |
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* code, but nevertheless some AT keyboard interfaces send |
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* make codes instead. Therefore, simply ignore |
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* break_flag... |
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*/ |
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int keyval, keytyp; |
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set_bit(scancode, broken_keys); |
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self_test_last_rcv = jiffies; |
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/* new Linux scancodes; approx. */ |
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keyval = scancode; |
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keytyp = KTYP(keyval) - 0xf0; |
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keyval = KVAL(keyval); |
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pr_warn("Key with scancode %d ", scancode); |
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if (keytyp == KT_LATIN || keytyp == KT_LETTER) { |
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if (keyval < ' ') |
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pr_cont("('^%c') ", keyval + '@'); |
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else |
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pr_cont("('%c') ", keyval); |
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} |
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pr_cont("is broken -- will be ignored.\n"); |
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break; |
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} else if (test_bit(scancode, broken_keys)) |
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break; |
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if (atari_input_keyboard_interrupt_hook) |
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atari_input_keyboard_interrupt_hook((unsigned char)scancode, !break_flag); |
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break; |
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} |
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break; |
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case AMOUSE: |
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kb_state.buf[kb_state.len++] = scancode; |
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if (kb_state.len == 5) { |
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kb_state.state = KEYBOARD; |
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/* not yet used */ |
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/* wake up someone waiting for this */ |
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} |
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break; |
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case RMOUSE: |
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kb_state.buf[kb_state.len++] = scancode; |
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if (kb_state.len == 3) { |
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kb_state.state = KEYBOARD; |
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if (atari_input_mouse_interrupt_hook) |
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atari_input_mouse_interrupt_hook(kb_state.buf); |
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} |
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break; |
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case JOYSTICK: |
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kb_state.buf[1] = scancode; |
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kb_state.state = KEYBOARD; |
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#ifdef FIXED_ATARI_JOYSTICK |
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atari_joystick_interrupt(kb_state.buf); |
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#endif |
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break; |
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case CLOCK: |
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kb_state.buf[kb_state.len++] = scancode; |
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if (kb_state.len == 6) { |
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kb_state.state = KEYBOARD; |
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/* wake up someone waiting for this. |
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But will this ever be used, as Linux keeps its own time. |
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Perhaps for synchronization purposes? */ |
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/* wake_up_interruptible(&clock_wait); */ |
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} |
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break; |
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case RESYNC: |
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if (kb_state.len <= 0 || IS_SYNC_CODE(scancode)) { |
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kb_state.state = KEYBOARD; |
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goto interpret_scancode; |
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} |
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kb_state.len--; |
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break; |
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} |
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} |
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#if 0 |
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if (acia_stat & ACIA_CTS) |
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/* cannot happen */; |
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#endif |
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if (acia_stat & (ACIA_FE | ACIA_PE)) { |
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pr_err("Error in keyboard communication\n"); |
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} |
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/* handle_scancode() can take a lot of time, so check again if |
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* some character arrived |
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*/ |
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goto repeat; |
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} |
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/* |
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* I write to the keyboard without using interrupts, I poll instead. |
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* This takes for the maximum length string allowed (7) at 7812.5 baud |
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* 8 data 1 start 1 stop bit: 9.0 ms |
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* If this takes too long for normal operation, interrupt driven writing |
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* is the solution. (I made a feeble attempt in that direction but I |
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* kept it simple for now.) |
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*/ |
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void ikbd_write(const char *str, int len) |
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{ |
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u_char acia_stat; |
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if ((len < 1) || (len > 7)) |
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panic("ikbd: maximum string length exceeded"); |
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while (len) { |
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acia_stat = acia.key_ctrl; |
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if (acia_stat & ACIA_TDRE) { |
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acia.key_data = *str++; |
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len--; |
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} |
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} |
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} |
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/* Reset (without touching the clock) */ |
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void ikbd_reset(void) |
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{ |
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static const char cmd[2] = { 0x80, 0x01 }; |
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ikbd_write(cmd, 2); |
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/* |
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* if all's well code 0xF1 is returned, else the break codes of |
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* all keys making contact |
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*/ |
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} |
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/* Set mouse button action */ |
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void ikbd_mouse_button_action(int mode) |
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{ |
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char cmd[2] = { 0x07, mode }; |
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ikbd_write(cmd, 2); |
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} |
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/* Set relative mouse position reporting */ |
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void ikbd_mouse_rel_pos(void) |
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{ |
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static const char cmd[1] = { 0x08 }; |
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ikbd_write(cmd, 1); |
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} |
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EXPORT_SYMBOL(ikbd_mouse_rel_pos); |
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/* Set absolute mouse position reporting */ |
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void ikbd_mouse_abs_pos(int xmax, int ymax) |
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{ |
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char cmd[5] = { 0x09, xmax>>8, xmax&0xFF, ymax>>8, ymax&0xFF }; |
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ikbd_write(cmd, 5); |
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} |
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/* Set mouse keycode mode */ |
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void ikbd_mouse_kbd_mode(int dx, int dy) |
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{ |
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char cmd[3] = { 0x0A, dx, dy }; |
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ikbd_write(cmd, 3); |
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} |
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/* Set mouse threshold */ |
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void ikbd_mouse_thresh(int x, int y) |
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{ |
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char cmd[3] = { 0x0B, x, y }; |
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ikbd_write(cmd, 3); |
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} |
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EXPORT_SYMBOL(ikbd_mouse_thresh); |
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/* Set mouse scale */ |
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void ikbd_mouse_scale(int x, int y) |
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{ |
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char cmd[3] = { 0x0C, x, y }; |
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ikbd_write(cmd, 3); |
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} |
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/* Interrogate mouse position */ |
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void ikbd_mouse_pos_get(int *x, int *y) |
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{ |
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static const char cmd[1] = { 0x0D }; |
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ikbd_write(cmd, 1); |
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/* wait for returning bytes */ |
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} |
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/* Load mouse position */ |
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void ikbd_mouse_pos_set(int x, int y) |
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{ |
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char cmd[6] = { 0x0E, 0x00, x>>8, x&0xFF, y>>8, y&0xFF }; |
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ikbd_write(cmd, 6); |
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} |
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/* Set Y=0 at bottom */ |
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void ikbd_mouse_y0_bot(void) |
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{ |
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static const char cmd[1] = { 0x0F }; |
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ikbd_write(cmd, 1); |
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} |
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/* Set Y=0 at top */ |
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void ikbd_mouse_y0_top(void) |
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{ |
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static const char cmd[1] = { 0x10 }; |
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ikbd_write(cmd, 1); |
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} |
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EXPORT_SYMBOL(ikbd_mouse_y0_top); |
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/* Disable mouse */ |
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void ikbd_mouse_disable(void) |
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{ |
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static const char cmd[1] = { 0x12 }; |
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ikbd_write(cmd, 1); |
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} |
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EXPORT_SYMBOL(ikbd_mouse_disable); |
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/* Set joystick event reporting */ |
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void ikbd_joystick_event_on(void) |
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{ |
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static const char cmd[1] = { 0x14 }; |
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ikbd_write(cmd, 1); |
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} |
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/* Set joystick interrogation mode */ |
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void ikbd_joystick_event_off(void) |
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{ |
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static const char cmd[1] = { 0x15 }; |
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ikbd_write(cmd, 1); |
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} |
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/* Joystick interrogation */ |
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void ikbd_joystick_get_state(void) |
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{ |
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static const char cmd[1] = { 0x16 }; |
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ikbd_write(cmd, 1); |
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} |
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#if 0 |
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/* This disables all other ikbd activities !!!! */ |
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/* Set joystick monitoring */ |
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void ikbd_joystick_monitor(int rate) |
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{ |
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static const char cmd[2] = { 0x17, rate }; |
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ikbd_write(cmd, 2); |
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kb_state.state = JOYSTICK_MONITOR; |
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} |
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#endif |
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/* some joystick routines not in yet (0x18-0x19) */ |
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/* Disable joysticks */ |
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void ikbd_joystick_disable(void) |
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{ |
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static const char cmd[1] = { 0x1A }; |
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ikbd_write(cmd, 1); |
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} |
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/* |
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* The original code sometimes left the interrupt line of |
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* the ACIAs low forever. I hope, it is fixed now. |
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* |
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* Martin Rogge, 20 Aug 1995 |
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*/ |
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static int atari_keyb_done = 0; |
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int atari_keyb_init(void) |
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{ |
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int error; |
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if (atari_keyb_done) |
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return 0; |
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kb_state.state = KEYBOARD; |
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kb_state.len = 0; |
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error = request_irq(IRQ_MFP_ACIA, atari_keyboard_interrupt, 0, |
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"keyboard,mouse,MIDI", atari_keyboard_interrupt); |
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if (error) |
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return error; |
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atari_turnoff_irq(IRQ_MFP_ACIA); |
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do { |
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/* reset IKBD ACIA */ |
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acia.key_ctrl = ACIA_RESET | |
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((atari_switches & ATARI_SWITCH_IKBD) ? |
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ACIA_RHTID : 0); |
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(void)acia.key_ctrl; |
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(void)acia.key_data; |
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/* reset MIDI ACIA */ |
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acia.mid_ctrl = ACIA_RESET | |
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((atari_switches & ATARI_SWITCH_MIDI) ? |
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ACIA_RHTID : 0); |
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(void)acia.mid_ctrl; |
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(void)acia.mid_data; |
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/* divide 500kHz by 64 gives 7812.5 baud */ |
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/* 8 data no parity 1 start 1 stop bit */ |
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/* receive interrupt enabled */ |
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/* RTS low (except if switch selected), transmit interrupt disabled */ |
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acia.key_ctrl = (ACIA_DIV64|ACIA_D8N1S|ACIA_RIE) | |
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((atari_switches & ATARI_SWITCH_IKBD) ? |
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ACIA_RHTID : ACIA_RLTID); |
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acia.mid_ctrl = ACIA_DIV16 | ACIA_D8N1S | |
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((atari_switches & ATARI_SWITCH_MIDI) ? |
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ACIA_RHTID : 0); |
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/* make sure the interrupt line is up */ |
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} while ((st_mfp.par_dt_reg & 0x10) == 0); |
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|
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/* enable ACIA Interrupts */ |
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st_mfp.active_edge &= ~0x10; |
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atari_turnon_irq(IRQ_MFP_ACIA); |
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ikbd_self_test = 1; |
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ikbd_reset(); |
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/* wait for a period of inactivity (here: 0.25s), then assume the IKBD's |
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* self-test is finished */ |
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self_test_last_rcv = jiffies; |
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while (time_before(jiffies, self_test_last_rcv + HZ/4)) |
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barrier(); |
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/* if not incremented: no 0xf1 received */ |
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if (ikbd_self_test == 1) |
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pr_err("Keyboard self test failed!\n"); |
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ikbd_self_test = 0; |
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ikbd_mouse_disable(); |
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ikbd_joystick_disable(); |
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#ifdef FIXED_ATARI_JOYSTICK |
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atari_joystick_init(); |
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#endif |
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// flag init done |
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atari_keyb_done = 1; |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(atari_keyb_init);
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