/*
*
* BRIEF MODULE DESCRIPTION
* Qtronix 990P infrared keyboard driver.
*
*
* Copyright 2001 MontaVista Software Inc.
* Author: MontaVista Software, Inc.
* ppopov@mvista.com or source@mvista.com
*
*
* The bottom portion of this driver was take from
* pc_keyb.c Please see that file for copyrights.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* NOTE:
*
* This driver has only been tested with the Consumer IR
* port of the ITE 8172 system controller.
*
* You do not need this driver if you are using the ps/2 or
* USB adapter that the keyboard ships with. You only need
* this driver if your board has a IR port and the keyboard
* data is being sent directly to the IR. In that case,
* you also need some low-level IR support. See it8172_cir.c.
*
*/
#ifdef CONFIG_QTRONIX_KEYBOARD
#include <linux/module.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <asm/it8172/it8172.h>
#include <asm/it8172/it8172_int.h>
#include <asm/it8172/it8172_cir.h>
#include <linux/spinlock.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/tty.h>
#include <linux/mm.h>
#include <linux/signal.h>
#include <linux/init.h>
#include <linux/kbd_ll.h>
#include <linux/delay.h>
#include <linux/poll.h>
#include <linux/miscdevice.h>
#include <linux/slab.h>
#include <linux/kbd_kern.h>
#include <linux/smp_lock.h>
#include <asm/io.h>
#include <linux/pc_keyb.h>
#include <asm/keyboard.h>
#include <linux/bitops.h>
#include <asm/uaccess.h>
#include <asm/irq.h>
#include <asm/system.h>
#define leading1 0
#define leading2 0xF
#define KBD_CIR_PORT 0
#define AUX_RECONNECT 170 /* scancode when ps2 device is plugged (back) in */
static int data_index;
struct cir_port *cir;
static unsigned char kbdbytes[5];
static unsigned char cir_data[32]; /* we only need 16 chars */
static void kbd_int_handler(int irq, void *dev_id);
static int handle_data(unsigned char *p_data);
static inline void handle_mouse_event(unsigned char scancode);
static inline void handle_keyboard_event(unsigned char scancode, int down);
static int __init psaux_init(void);
static struct aux_queue *queue; /* Mouse data buffer. */
static int aux_count = 0;
/*
* Keys accessed through the 'Fn' key
* The Fn key does not produce a key-up sequence. So, the first
* time the user presses it, it will be key-down event. The key
* stays down until the user presses it again.
*/
#define NUM_FN_KEYS 56
static unsigned char fn_keys[NUM_FN_KEYS] = {
0,0,0,0,0,0,0,0, /* 0 7 */
8,9,10,93,0,0,0,0, /* 8 15 */
0,0,0,0,0,0,0,5, /* 16 23 */
6,7,91,0,0,0,0,0, /* 24 31 */
0,0,0,0,0,2,3,4, /* 32 39 */
92,0,0,0,0,0,0,0, /* 40 47 */
0,0,0,0,11,0,94,95 /* 48 55 */
};
void __init init_qtronix_990P_kbd(void)
{
int retval;
cir = (struct cir_port *)kmalloc(sizeof(struct cir_port), GFP_KERNEL);
if (!cir) {
printk("Unable to initialize Qtronix keyboard\n");
return;
}
/*
* revisit
* this should be programmable, somehow by the, by the user.
*/
cir->port = KBD_CIR_PORT;
cir->baud_rate = 0x1d;
cir->rdwos = 0;
cir->rxdcr = 0x3;
cir->hcfs = 0;
cir->fifo_tl = 0;
cir->cfq = 0x1d;
cir_port_init(cir);
retval = request_irq(IT8172_CIR0_IRQ, kbd_int_handler,
(unsigned long )(IRQF_DISABLED|IRQF_SHARED),
(const char *)"Qtronix IR Keyboard", (void *)cir);
if (retval) {
printk("unable to allocate cir %d irq %d\n",
cir->port, IT8172_CIR0_IRQ);
}
#ifdef CONFIG_PSMOUSE
psaux_init();
#endif
}
static inline unsigned char BitReverse(unsigned short key)
{
unsigned char rkey = 0;
rkey |= (key & 0x1) << 7;
rkey |= (key & 0x2) << 5;
rkey |= (key & 0x4) << 3;
rkey |= (key & 0x8) << 1;
rkey |= (key & 0x10) >> 1;
rkey |= (key & 0x20) >> 3;
rkey |= (key & 0x40) >> 5;
rkey |= (key & 0x80) >> 7;
return rkey;
}
static inline u_int8_t UpperByte(u_int8_t data)
{
return (data >> 4);
}
static inline u_int8_t LowerByte(u_int8_t data)
{
return (data & 0xF);
}
int CheckSumOk(u_int8_t byte1, u_int8_t byte2,
u_int8_t byte3, u_int8_t byte4, u_int8_t byte5)
{
u_int8_t CheckSum;
CheckSum = (byte1 & 0x0F) + byte2 + byte3 + byte4 + byte5;
if ( LowerByte(UpperByte(CheckSum) + LowerByte(CheckSum)) != UpperByte(byte1) )
return 0;
else
return 1;
}
static void kbd_int_handler(int irq, void *dev_id)
{
struct cir_port *cir;
int j;
unsigned char int_status;
cir = (struct cir_port *)dev_id;
int_status = get_int_status(cir);
if (int_status & 0x4) {
clear_fifo(cir);
return;
}
while (cir_get_rx_count(cir)) {
cir_data[data_index] = cir_read_data(cir);
if (data_index == 0) {/* expecting first byte */
if (cir_data[data_index] != leading1) {
//printk("!leading byte %x\n", cir_data[data_index]);
set_rx_active(cir);
clear_fifo(cir);
continue;
}
}
if (data_index == 1) {
if ((cir_data[data_index] & 0xf) != leading2) {
set_rx_active(cir);
data_index = 0; /* start over */
clear_fifo(cir);
continue;
}
}
if ( (cir_data[data_index] == 0xff)) { /* last byte */
//printk("data_index %d\n", data_index);
set_rx_active(cir);
#if 0
for (j=0; j<=data_index; j++) {
printk("rx_data %d: %x\n", j, cir_data[j]);
}
#endif
data_index = 0;
handle_data(cir_data);
return;
}
else if (data_index>16) {
set_rx_active(cir);
#if 0
printk("warning: data_index %d\n", data_index);
for (j=0; j<=data_index; j++) {
printk("rx_data %d: %x\n", j, cir_data[j]);
}
#endif
data_index = 0;
clear_fifo(cir);
return;
}
data_index++;
}
}
#define NUM_KBD_BYTES 5
static int handle_data(unsigned char *p_data)
{
u_int32_t bit_bucket;
u_int32_t i, j;
u_int32_t got_bits, next_byte;
int down = 0;
/* Reorganize the bit stream */
for (i=0; i<16; i++)
p_data[i] = BitReverse(~p_data[i]);
/*
* We've already previously checked that p_data[0]
* is equal to leading1 and that (p_data[1] & 0xf)
* is equal to leading2. These twelve bits are the
* leader code. We can now throw them away (the 12
* bits) and continue parsing the stream.
*/
bit_bucket = p_data[1] << 12;
got_bits = 4;
next_byte = 2;
/*
* Process four bits at a time
*/
for (i=0; i<NUM_KBD_BYTES; i++) {
kbdbytes[i]=0;
for (j=0; j<8; j++) /* 8 bits per byte */
{
if (got_bits < 4) {
bit_bucket |= (p_data[next_byte++] << (8 - got_bits));
got_bits += 8;
}
if ((bit_bucket & 0xF000) == 0x8000) {
/* Convert 1000b to 1 */
kbdbytes[i] = 0x80 | (kbdbytes[i] >> 1);
got_bits -= 4;
bit_bucket = bit_bucket << 4;
}
else if ((bit_bucket & 0xC000) == 0x8000) {
/* Convert 10b to 0 */
kbdbytes[i] = kbdbytes[i] >> 1;
got_bits -= 2;
bit_bucket = bit_bucket << 2;
}
else {
/* bad serial stream */
return 1;
}
if (next_byte > 16) {
//printk("error: too many bytes\n");
return 1;
}
}
}
if (!CheckSumOk(kbdbytes[0], kbdbytes[1],
kbdbytes[2], kbdbytes[3], kbdbytes[4])) {
//printk("checksum failed\n");
return 1;
}
if (kbdbytes[1] & 0x08) {
//printk("m: %x %x %x\n", kbdbytes[1], kbdbytes[2], kbdbytes[3]);
handle_mouse_event(kbdbytes[1]);
handle_mouse_event(kbdbytes[2]);
handle_mouse_event(kbdbytes[3]);
}
else {
if (kbdbytes[2] == 0) down = 1;
#if 0
if (down)
printk("down %d\n", kbdbytes[3]);
else
printk("up %d\n", kbdbytes[3]);
#endif
handle_keyboard_event(kbdbytes[3], down);
}
return 0;
}
DEFINE_SPINLOCK(kbd_controller_lock);
static unsigned char handle_kbd_event(void);
int kbd_setkeycode(unsigned int scancode, unsigned int keycode)
{
printk("kbd_setkeycode scancode %x keycode %x\n", scancode, keycode);
return 0;
}
int kbd_getkeycode(unsigned int scancode)
{
return scancode;
}
int kbd_translate(unsigned char scancode, unsigned char *keycode,
char raw_mode)
{
static int prev_scancode = 0;
if (scancode == 0x00 || scancode == 0xff) {
prev_scancode = 0;
return 0;
}
/* todo */
if (!prev_scancode && scancode == 160) { /* Fn key down */
//printk("Fn key down\n");
prev_scancode = 160;
return 0;
}
else if (prev_scancode && scancode == 160) { /* Fn key up */
//printk("Fn key up\n");
prev_scancode = 0;
return 0;
}
/* todo */
if (prev_scancode == 160) {
if (scancode <= NUM_FN_KEYS) {
*keycode = fn_keys[scancode];
//printk("fn keycode %d\n", *keycode);
}
else
return 0;
}
else if (scancode <= 127) {
*keycode = scancode;
}
else
return 0;
return 1;
}
char kbd_unexpected_up(unsigned char keycode)
{
//printk("kbd_unexpected_up\n");
return 0;
}
static unsigned char kbd_exists = 1;
static inline void handle_keyboard_event(unsigned char scancode, int down)
{
kbd_exists = 1;
handle_scancode(scancode, down);
tasklet_schedule(&keyboard_tasklet);
}
void kbd_leds(unsigned char leds)
{
}
/* dummy */
void kbd_init_hw(void)
{
}
static inline void handle_mouse_event(unsigned char scancode)
{
if(scancode == AUX_RECONNECT){
queue->head = queue->tail = 0; /* Flush input queue */
// __aux_write_ack(AUX_ENABLE_DEV); /* ping the mouse :) */
return;
}
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;
kill_fasync(&queue->fasync, SIGIO, POLL_IN);
wake_up_interruptible(&queue->proc_list);
}
}
}
static unsigned char get_from_queue(void)
{
unsigned char result;
unsigned long flags;
spin_lock_irqsave(&kbd_controller_lock, flags);
result = queue->buf[queue->tail];
queue->tail = (queue->tail + 1) & (AUX_BUF_SIZE-1);
spin_unlock_irqrestore(&kbd_controller_lock, flags);
return result;
}
static inline int queue_empty(void)
{
return queue->head == queue->tail;
}
static int fasync_aux(int fd, struct file *filp, int on)
{
int retval;
//printk("fasync_aux\n");
retval = fasync_helper(fd, filp, on, &queue->fasync);
if (retval < 0)
return retval;
return 0;
}
/*
* Random magic cookie for the aux device
*/
#define AUX_DEV ((void *)queue)
static int release_aux(struct inode * inode, struct file * file)
{
fasync_aux(-1, file, 0);
aux_count--;
return 0;
}
static int open_aux(struct inode * inode, struct file * file)
{
if (aux_count++) {
return 0;
}
queue->head = queue->tail = 0; /* Flush input queue */
return 0;
}
/*
* Put bytes from input queue to buffer.
*/
static ssize_t read_aux(struct file * file, char * buffer,
size_t count, loff_t *ppos)
{
DECLARE_WAITQUEUE(wait, current);
ssize_t i = count;
unsigned char c;
if (queue_empty()) {
if (file->f_flags & O_NONBLOCK)
return -EAGAIN;
add_wait_queue(&queue->proc_list, &wait);
repeat:
set_current_state(TASK_INTERRUPTIBLE);
if (queue_empty() && !signal_pending(current)) {
schedule();
goto repeat;
}
current->state = TASK_RUNNING;
remove_wait_queue(&queue->proc_list, &wait);
}
while (i > 0 && !queue_empty()) {
c = get_from_queue();
put_user(c, buffer++);
i--;
}
if (count-i) {
struct inode *inode = file->f_dentry->d_inode;
inode->i_atime = current_fs_time(inode->i_sb);
return count-i;
}
if (signal_pending(current))
return -ERESTARTSYS;
return 0;
}
/*
* Write to the aux device.
*/
static ssize_t write_aux(struct file * file, const char * buffer,
size_t count, loff_t *ppos)
{
/*
* The ITE boards this was tested on did not have the
* transmit wires connected.
*/
return count;
}
static unsigned int aux_poll(struct file *file, poll_table * wait)
{
poll_wait(file, &queue->proc_list, wait);
if (!queue_empty())
return POLLIN | POLLRDNORM;
return 0;
}
struct file_operations psaux_fops = {
.read = read_aux,
.write = write_aux,
.poll = aux_poll,
.open = open_aux,
.release = release_aux,
.fasync = fasync_aux,
};
/*
* Initialize driver.
*/
static struct miscdevice psaux_mouse = {
PSMOUSE_MINOR, "psaux", &psaux_fops
};
static int __init psaux_init(void)
{
int retval;
retval = misc_register(&psaux_mouse);
if(retval < 0)
return retval;
queue = (struct aux_queue *) kmalloc(sizeof(*queue), GFP_KERNEL);
if (!queue) {
misc_deregister(&psaux_mouse);
return -ENOMEM;
}
memset(queue, 0, sizeof(*queue));
queue->head = queue->tail = 0;
init_waitqueue_head(&queue->proc_list);
return 0;
}
module_init(init_qtronix_990P_kbd);
#endif
