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/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* Chrome OS EC i8042 interface code.
*/
#include "board.h"
#include "common.h"
#include "console.h"
#include "i8042.h"
#include "keyboard.h"
#include "lpc.h"
#include "queue.h"
#include "task.h"
#include "timer.h"
#include "util.h"
#define I8042_DEBUG 1
/* Console output macros */
#if I8042_DEBUG >= 4
#define CPRINTF4(format, args...) cprintf(CC_I8042, format, ## args)
#else
#define CPRINTF4(format, args...)
#endif
#if I8042_DEBUG >= 5
#define CPRINTF5(format, args...) cprintf(CC_I8042, format, ## args)
#else
#define CPRINTF5(format, args...)
#endif
static int i8042_irq_enabled;
static struct mutex to_host_mutex;
static uint8_t to_host_buffer[16];
static struct queue to_host = {
.buf_bytes = ARRAY_SIZE(to_host_buffer),
.unit_bytes = sizeof(uint8_t),
.buf = to_host_buffer,
};
/* Queue command/data from the host */
enum {
HOST_COMMAND = 0,
HOST_DATA,
};
struct host_byte {
uint8_t type;
uint8_t byte;
};
/* 4 is big enough for all i8042 commands */
static uint8_t from_host_buffer[4 * sizeof(struct host_byte)];
static struct queue from_host = {
.buf_bytes = ARRAY_SIZE(from_host_buffer),
.unit_bytes = sizeof(struct host_byte),
.buf = from_host_buffer,
};
/* Reset all i8042 buffer */
void i8042_flush_buffer()
{
queue_reset(&to_host);
lpc_keyboard_clear_buffer();
}
/* Called by the chip-specific code when host sends a byte to port 0x60.
* Note that this is in the interrupt context.
*/
void i8042_receives_data(int data)
{
struct host_byte h;
h.type = HOST_DATA;
h.byte = data;
queue_add_units(&from_host, &h, 1);
task_wake(TASK_ID_I8042CMD);
}
/* Called by the chip-specific code when host sends a byte to port 0x64.
* Note that this is in the interrupt context.
*/
void i8042_receives_command(int cmd)
{
struct host_byte h;
h.type = HOST_COMMAND;
h.byte = cmd;
queue_add_units(&from_host, &h, 1);
task_wake(TASK_ID_I8042CMD);
}
/* Called by common/keyboard.c when the host wants to receive keyboard IRQ
* (or not).
*/
void i8042_enable_keyboard_irq(void) {
i8042_irq_enabled = 1;
lpc_keyboard_resume_irq();
}
void i8042_disable_keyboard_irq(void) {
i8042_irq_enabled = 0;
}
static void i8042_handle_from_host(void)
{
struct host_byte h;
int ret_len;
uint8_t output[MAX_SCAN_CODE_LEN];
enum ec_error_list ret;
while (queue_remove_unit(&from_host, &h)) {
if (h.type == HOST_COMMAND)
ret_len = handle_keyboard_command(h.byte, output);
else
ret_len = handle_keyboard_data(h.byte, output);
ret = i8042_send_to_host(ret_len, output);
ASSERT(ret == EC_SUCCESS);
}
}
void i8042_command_task(void)
{
while (1) {
/* Either a new byte to host or host picking up can un-block. */
task_wait_event(-1);
while (1) {
uint8_t chr;
/* first handle command/data from host. */
i8042_handle_from_host();
/* Check if we have data in buffer to host. */
if (queue_is_empty(&to_host))
break; /* nothing to host */
/* if the host still didn't read that away,
try next time. */
if (lpc_keyboard_has_char()) {
CPRINTF5("[%T i8042_command_task() "
"cannot send to host due to host "
"haven't taken away.\n");
break;
}
/* Get a char from buffer. */
kblog_put('k', to_host.head);
queue_remove_unit(&to_host, &chr);
kblog_put('K', chr);
/* Write to host. */
lpc_keyboard_put_char(chr, i8042_irq_enabled);
CPRINTF4("[%T i8042_command_task() "
"sends to host: 0x%02x\n", chr);
}
}
}
static void enq_to_host(int len, const uint8_t *bytes)
{
int i;
mutex_lock(&to_host_mutex);
/* Check if the buffer has enough space, then copy them to buffer. */
if (queue_has_space(&to_host, len)) {
for (i = 0; i < len; ++i) {
kblog_put('t', to_host.tail);
kblog_put('T', bytes[i]);
}
queue_add_units(&to_host, bytes, len);
}
mutex_unlock(&to_host_mutex);
}
enum ec_error_list i8042_send_to_host(int len, const uint8_t *bytes)
{
int i;
for (i = 0; i < len; i++)
kblog_put('s', bytes[i]);
/* Put to queue in memory */
enq_to_host(len, bytes);
/* Wake up the task to move from queue to the buffer to host. */
task_wake(TASK_ID_I8042CMD);
return EC_SUCCESS;
}
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