diff options
Diffstat (limited to 'bsps/i386/pc386/console/ps2_mouse.c')
| -rw-r--r-- | bsps/i386/pc386/console/ps2_mouse.c | 562 |
1 files changed, 562 insertions, 0 deletions
diff --git a/bsps/i386/pc386/console/ps2_mouse.c b/bsps/i386/pc386/console/ps2_mouse.c new file mode 100644 index 0000000000..6a3f8551b4 --- /dev/null +++ b/bsps/i386/pc386/console/ps2_mouse.c @@ -0,0 +1,562 @@ +/* + * linux/drivers/char/pc_keyb.c + * Separation of the PC low-level part by Geert Uytterhoeven, May 1997 + * See keyboard.c for the whole history. + * Major cleanup by Martin Mares, May 1997 + * Combined the keyboard and PS/2 mouse handling into one file, + * because they share the same hardware. + * Johan Myreen <jem@iki.fi> 1998-10-08. + * Code fixes to handle mouse ACKs properly. + * C. Scott Ananian <cananian@alumni.princeton.edu> 1999-01-29. + * + * RTEMS port: by Rosimildo da Silva. + */ + +#include <stdlib.h> +#include <stdio.h> +#include <string.h> +#include <errno.h> +#include <sys/types.h> +#include <assert.h> + +#include <bsp.h> +#include <bsp/irq.h> +#include <rtems/libio.h> +#include <termios.h> +#include <i386_io.h> +#include <rtems/mw_uid.h> +#include <rtems/mouse_parser.h> + +#define INITIALIZE_MOUSE +/* Some configuration switches are present in the include file... */ +#include <rtems/ps2_drv.h> +#include "ps2_mouse.h" + +static void kbd_write_command_w(int data); +#if 0 +static void kbd_write_output_w(int data); +#endif + +static unsigned char handle_kbd_event(void); +static void ps2_set_driver_handler(int port, mouse_parser_enqueue_handler handler); + +/* used only by send_data - set by keyboard_interrupt */ +static volatile unsigned char reply_expected = 0; +static volatile unsigned char acknowledge = 0; +static volatile unsigned char resend = 0; + +/* + * PS/2 Auxiliary Device + */ +static int psaux_init(void); + +static struct aux_queue *queue; /* Mouse data buffer. */ +static int aux_count = 0; +/* used when we send commands to the mouse that expect an ACK. */ +static unsigned char mouse_reply_expected = 0; + +#define AUX_INTS_OFF (KBD_MODE_KCC | KBD_MODE_DISABLE_MOUSE | KBD_MODE_SYS | KBD_MODE_KBD_INT) +#define AUX_INTS_ON (KBD_MODE_KCC | KBD_MODE_SYS | KBD_MODE_MOUSE_INT | KBD_MODE_KBD_INT) +#define MAX_RETRIES 60 /* some aux operations take long time*/ + +static void ps2_mouse_interrupt(void *); +static mouse_parser_enqueue_handler driver_input_handler_ps2 = NULL; + +/* + * This routine sets the handler to handle the characters received + * from the serial port. + */ +static void ps2_set_driver_handler( + int port, + mouse_parser_enqueue_handler handler +) +{ + driver_input_handler_ps2 = handler; +} + +static void mdelay( unsigned long t ) +{ + Wait_X_ms( t ); +} + +static void* termios_ttyp_paux = NULL; + +/* + * Wait for keyboard controller input buffer to drain. + * + * Don't use 'jiffies' so that we don't depend on + * interrupts.. + * + * Quote from PS/2 System Reference Manual: + * + * "Address hex 0060 and address hex 0064 should be written only when + * the input-buffer-full bit and output-buffer-full bit in the + * Controller Status register are set 0." + */ + +static void kb_wait(void) +{ + unsigned long timeout = KBC_TIMEOUT; + + do { + /* + * "handle_kbd_event()" will handle any incoming events + * while we wait - keypresses or mouse movement. + */ + unsigned char status = handle_kbd_event(); + + if (! (status & KBD_STAT_IBF)) + return; + + mdelay(1); + timeout--; + } while (timeout); + + #ifdef KBD_REPORT_TIMEOUTS + printk( "Keyboard timed out[1]\n"); + #endif +} + +static int do_acknowledge(unsigned char scancode) +{ + if (reply_expected) { + + /* Unfortunately, we must recognise these codes only if we know they + * are known to be valid (i.e., after sending a command), because there + * are some brain-damaged keyboards (yes, FOCUS 9000 again) which have + * keys with such codes :( + */ + if (scancode == KBD_REPLY_ACK) { + acknowledge = 1; + reply_expected = 0; + return 0; + } else if (scancode == KBD_REPLY_RESEND) { + resend = 1; + reply_expected = 0; + return 0; + } + + /* Should not happen... */ + #if 0 + printk( "keyboard reply expected - got %02x\n", scancode); + #endif + } + return 1; +} + +static inline void handle_mouse_event(unsigned char scancode) +{ + if (mouse_reply_expected) { + if (scancode == AUX_ACK) { + mouse_reply_expected--; + return; + } + mouse_reply_expected = 0; + } + + if (aux_count) { + int head = queue->head; + queue->buf[head] = scancode; + head = (head + 1) & (AUX_BUF_SIZE-1); + if (head != queue->tail) { + queue->head = head; + } + + /* if the input queue is active, add to it */ + if( driver_input_handler_ps2 ) { + driver_input_handler_ps2( &scancode, 1 ); + } else { + /* post this byte to termios */ + rtems_termios_enqueue_raw_characters( termios_ttyp_paux, (char *)&scancode, 1 ); + } + } +} + +/* + * This reads the keyboard status port, and does the + * appropriate action. + * + * It requires that we hold the keyboard controller + * spinlock. + */ +static unsigned char handle_kbd_event(void) +{ + unsigned char status = kbd_read_status(); + unsigned int work = 10000; + + while (status & KBD_STAT_OBF) { + unsigned char scancode; + scancode = kbd_read_input(); + if (status & KBD_STAT_MOUSE_OBF) { + handle_mouse_event(scancode); + } else { + do_acknowledge(scancode); + printk("pc_keyb: %X ", scancode ); + } + status = kbd_read_status(); + if(!work--) { + printk("pc_keyb: controller jammed (0x%02X).\n", status); + break; + } + } + return status; +} + +static void ps2_mouse_interrupt(void * unused) +{ + handle_kbd_event(); +} + +static void kbd_write_command_w(int data) +{ + kb_wait(); + kbd_write_command(data); +} + +static void kbd_write_cmd(int cmd) +{ + kb_wait(); + kbd_write_command(KBD_CCMD_WRITE_MODE); + kb_wait(); + kbd_write_output(cmd); +} + +/* + * Check if this is a dual port controller. + */ +static int detect_auxiliary_port(void) +{ + int loops = 10; + int retval = 0; + + /* Put the value 0x5A in the output buffer using the "Write + * Auxiliary Device Output Buffer" command (0xD3). Poll the + * Status Register for a while to see if the value really + * turns up in the Data Register. If the KBD_STAT_MOUSE_OBF + * bit is also set to 1 in the Status Register, we assume this + * controller has an Auxiliary Port (a.k.a. Mouse Port). + */ + kb_wait(); + kbd_write_command(KBD_CCMD_WRITE_AUX_OBUF); + + kb_wait(); + kbd_write_output(0x5a); /* 0x5a is a random dummy value. */ + + do { + unsigned char status = kbd_read_status(); + if (status & KBD_STAT_OBF) { + kbd_read_input(); + if (status & KBD_STAT_MOUSE_OBF) { + printk( "Detected PS/2 Mouse Port.\n"); + retval = 1; + } + break; + } + mdelay(1); + } while (--loops); + return retval; +} + +/* + * Send a byte to the mouse. + */ +static void aux_write_dev(int val) +{ + kb_wait(); + kbd_write_command(KBD_CCMD_WRITE_MOUSE); + kb_wait(); + kbd_write_output(val); +} + +/* + * Send a byte to the mouse & handle returned ack + */ +static void aux_write_ack(int val) +{ + kb_wait(); + kbd_write_command(KBD_CCMD_WRITE_MOUSE); + kb_wait(); + kbd_write_output(val); + /* we expect an ACK in response. */ + mouse_reply_expected++; + kb_wait(); +} + +static unsigned char get_from_queue(void) +{ + unsigned char result; + result = queue->buf[queue->tail]; + queue->tail = (queue->tail + 1) & (AUX_BUF_SIZE-1); + return result; +} + +static int queue_empty(void) +{ + return queue->head == queue->tail; +} + +/* + * Random magic cookie for the aux device + */ +#define AUX_DEV ((void *)queue) + +static int release_aux(void) +{ + rtems_status_code status; + if (--aux_count) + return 0; + kbd_write_cmd(AUX_INTS_OFF); /* Disable controller ints */ + kbd_write_command_w(KBD_CCMD_MOUSE_DISABLE); + status = rtems_interrupt_handler_remove( + AUX_IRQ, + ps2_mouse_interrupt, + NULL + ); + assert(status == RTEMS_SUCCESSFUL); + return 0; +} + +/* + * Install interrupt handler. + * Enable auxiliary device. + */ + +static int open_aux(void) +{ + rtems_status_code status; + + if (aux_count++) { + return 0; + } + queue->head = queue->tail = 0; /* Flush input queue */ + + status = rtems_interrupt_handler_install( + AUX_IRQ, + "ps2_mouse", + RTEMS_INTERRUPT_UNIQUE, + ps2_mouse_interrupt, + NULL + ); + assert(status == RTEMS_SUCCESSFUL); + + kbd_write_command_w(KBD_CCMD_MOUSE_ENABLE); /* Enable the auxiliary port on + controller. */ + aux_write_ack(AUX_ENABLE_DEV); /* Enable aux device */ + kbd_write_cmd(AUX_INTS_ON); /* Enable controller ints */ + return 0; +} + +/* + * Put bytes from input queue to buffer. + */ +size_t read_aux(char * buffer, size_t count ) +{ + size_t i = count; + unsigned char c; + + if (queue_empty()) { + return 0; + } + while (i > 0 && !queue_empty()) { + c = get_from_queue(); + *buffer++ = c; + i--; + } + return count-i; +} + +/* + * Write to the aux device. + */ +static int write_aux( int minor, const char * buffer, int count ) +{ + int retval = 0; + + if (count) { + int written = 0; + if (count > 32) + count = 32; /* Limit to 32 bytes. */ + do { + char c; + c = *buffer++; + aux_write_dev(c); + written++; + } while (--count); + retval = -EIO; + if (written) { + retval = written; + } + } + return retval; +} + +static int psaux_init( void ) +{ + if( !detect_auxiliary_port() ) { + printk( "PS/2 - mouse not found.\n" ); + return -EIO; + } + queue = (struct aux_queue *)malloc( sizeof(*queue) ); + memset(queue, 0, sizeof(*queue)); + queue->head = queue->tail = 0; + queue->proc_list = NULL; + + #ifdef INITIALIZE_MOUSE + kbd_write_command_w(KBD_CCMD_MOUSE_ENABLE); /* Enable Aux. */ + aux_write_ack(AUX_SET_SAMPLE); + aux_write_ack(100); /* 100 samples/sec */ + aux_write_ack(AUX_SET_RES); + aux_write_ack(3); /* 8 counts per mm */ + aux_write_ack(AUX_SET_SCALE21); /* 2:1 scaling */ + #endif /* INITIALIZE_MOUSE */ + kbd_write_command(KBD_CCMD_MOUSE_DISABLE); /* Disable aux device. */ + kbd_write_cmd(AUX_INTS_OFF); /* Disable controller ints. */ + return 0; +} + +/* + * paux device driver INITIALIZE entry point. + */ +rtems_device_driver paux_initialize( + rtems_device_major_number major, + rtems_device_minor_number minor, + void *arg) +{ + rtems_status_code status; + + /* + * Set up TERMIOS + */ + rtems_termios_initialize(); + + printk( "PS/2 mouse probe.\n" ); + if( psaux_init() < 0 ) { + printk("Error detecting PS/2 mouse --\n"); + /* we might want to finish the application here !!! */ + } + open_aux(); + + /* + * Register the device + */ + status = rtems_io_register_name ("/dev/mouse", major, 0); + if (status != RTEMS_SUCCESSFUL) { + printk("Error registering paux device!\n"); + rtems_fatal_error_occurred (status); + } + return RTEMS_SUCCESSFUL; +} /* tty_initialize */ + +static int paux_last_close(int major, int minor, void *arg) +{ + release_aux(); + return 0; +} + +/* + * Write to the aux device. This routine is invoked by the + * termios framework whenever the "ECHO" feature is on. + * It does nothing write now. + */ +static ssize_t write_aux_echo( int minor, const char * buffer, size_t count ) +{ + return 0; +} + +/* + * paux device driver OPEN entry point + */ +rtems_device_driver paux_open( + rtems_device_major_number major, + rtems_device_minor_number minor, + void *arg) +{ + rtems_status_code status; + static rtems_termios_callbacks cb = + { + NULL, /* firstOpen */ + paux_last_close, /* lastClose */ + NULL, /* poll read */ + write_aux_echo, /* write */ + NULL, /* setAttributes */ + NULL, /* stopRemoteTx */ + NULL, /* startRemoteTx */ + 0 /* outputUsesInterrupts */ + }; + + status = rtems_termios_open (major, minor, arg, &cb ); + termios_ttyp_paux = ( (rtems_libio_open_close_args_t *)arg)->iop->data1; + return status; +} + +/* + * paux device driver CLOSE entry point + */ +rtems_device_driver paux_close( + rtems_device_major_number major, + rtems_device_minor_number minor, + void *arg) +{ + return (rtems_termios_close (arg)); +} + +/* + * paux device driver READ entry point. + * Read characters from the PS/2 mouse. + */ +rtems_device_driver paux_read( + rtems_device_major_number major, + rtems_device_minor_number minor, + void *arg) +{ + return rtems_termios_read (arg); +} /* tty_read */ + +/* + * paux device driver WRITE entry point. + * Write characters to the PS/2 mouse. + */ +rtems_device_driver paux_write( + rtems_device_major_number major, + rtems_device_minor_number minor, + void *arg) +{ + rtems_libio_rw_args_t *rw_args = (rtems_libio_rw_args_t *)arg; + char *buffer = rw_args->buffer; + int maximum = rw_args->count; + rw_args->bytes_moved = write_aux( minor, buffer, maximum ); + return RTEMS_SUCCESSFUL; +} /* tty_write */ + +/* + * Handle ioctl request. + */ +rtems_device_driver paux_control( + rtems_device_major_number major, + rtems_device_minor_number minor, + void *arg +) +{ + rtems_libio_ioctl_args_t *args = arg; + + switch( args->command ) { + default: + return rtems_termios_ioctl (arg); + break; + + case MW_UID_REGISTER_DEVICE: + printk( "PS2 Mouse: registering\n" ); + mouse_parser_initialize( "ps2" ); + ps2_set_driver_handler( minor, mouse_parser_enqueue ); + break; + + case MW_UID_UNREGISTER_DEVICE: +/* + unregister_mou_msg_queue( -1 ); +*/ + ps2_set_driver_handler( minor, NULL ); + break; + } + args->ioctl_return = 0; + return RTEMS_SUCCESSFUL; +} |