/*
handle cx231xx IR remotes via linux kernel input layer.
Copyright (C) 2008 <srinivasa.deevi at conexant dot com>
Based on em28xx driver
< This is a place holder for IR now.>
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 program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <linux/usb.h>
#include <linux/slab.h>
#include "cx231xx.h"
static unsigned int ir_debug;
module_param(ir_debug, int, 0644);
MODULE_PARM_DESC(ir_debug, "enable debug messages [IR]");
#define i2cdprintk(fmt, arg...) \
if (ir_debug) { \
printk(KERN_DEBUG "%s/ir: " fmt, ir->name , ## arg); \
}
#define dprintk(fmt, arg...) \
if (ir_debug) { \
printk(KERN_DEBUG "%s/ir: " fmt, ir->name , ## arg); \
}
/**********************************************************
Polling structure used by cx231xx IR's
**********************************************************/
struct cx231xx_ir_poll_result {
unsigned int toggle_bit:1;
unsigned int read_count:7;
u8 rc_address;
u8 rc_data[4];
};
struct cx231xx_IR {
struct cx231xx *dev;
struct input_dev *input;
struct ir_input_state ir;
char name[32];
char phys[32];
/* poll external decoder */
int polling;
struct work_struct work;
struct timer_list timer;
unsigned int last_toggle:1;
unsigned int last_readcount;
unsigned int repeat_interval;
int (*get_key) (struct cx231xx_IR *, struct cx231xx_ir_poll_result *);
};
/**********************************************************
Polling code for cx231xx
**********************************************************/
static void cx231xx_ir_handle_key(struct cx231xx_IR *ir)
{
int result;
int do_sendkey = 0;
struct cx231xx_ir_poll_result poll_result;
/* read the registers containing the IR status */
result = ir->get_key(ir, &poll_result);
if (result < 0) {
dprintk("ir->get_key() failed %d\n", result);
return;
}
dprintk("ir->get_key result tb=%02x rc=%02x lr=%02x data=%02x\n",
poll_result.toggle_bit, poll_result.read_count,
ir->last_readcount, poll_result.rc_data[0]);
if (ir->dev->chip_id == CHIP_ID_EM2874) {
/* The em2874 clears the readcount field every time the
register is read. The em2860/2880 datasheet says that it
is supposed to clear the readcount, but it doesn't. So with
the em2874, we are looking for a non-zero read count as
opposed to a readcount that is incrementing */
ir->last_readcount = 0;
}
if (poll_result.read_count == 0) {
/* The button has not been pressed since the last read */
} else if (ir->last_toggle != poll_result.toggle_bit) {
/* A button has been pressed */
dprintk("button has been pressed\n");
ir->last_toggle = poll_result.toggle_bit;
ir->repeat_interval = 0;
do_sendkey = 1;
} else if (poll_result.toggle_bit == ir->last_toggle &&
poll_result.read_count > 0 &&
poll_result.read_count != ir->last_readcount) {
/* The button is still being held down */
dprintk("button being held down\n");
/* Debouncer for first keypress */
if (ir->repeat_interval++ > 9) {
/* Start repeating after 1 second */
do_sendkey = 1;
}
}
if (do_sendkey) {
dprintk("sending keypress\n");
ir_input_keydown(ir->input, &ir->ir, poll_result.rc_data[0]);
ir_input_nokey(ir->input, &ir->ir);
}
ir->last_readcount = poll_result.read_count;
return;
}
static void ir_timer(unsigned long data)
{
struct cx231xx_IR *ir = (struct cx231xx_IR *)data;
schedule_work(&ir->work);
}
static void cx231xx_ir_work(struct work_struct *work)
{
struct cx231xx_IR *ir = container_of(work, struct cx231xx_IR, work);
cx231xx_ir_handle_key(ir);
mod_timer(&ir->timer, jiffies + msecs_to_jiffies(ir->polling));
}
void cx231xx_ir_start(struct cx231xx_IR *ir)
{
setup_timer(&ir->timer, ir_timer, (unsigned long)ir);
INIT_WORK(&ir->work, cx231xx_ir_work);
schedule_work(&ir->work);
}
static void cx231xx_ir_stop(struct cx231xx_IR *ir)
{
del_timer_sync(&ir->timer);
flush_scheduled_work();
}
int cx231xx_ir_init(struct cx231xx *dev)
{
struct cx231xx_IR *ir;
struct input_dev *input_dev;
u8 ir_config;
int err = -ENOMEM;
if (dev->board.ir_codes == NULL) {
/* No remote control support */
return 0;
}
ir = kzalloc(sizeof(*ir), GFP_KERNEL);
input_dev = input_allocate_device();
if (!ir || !input_dev)
goto err_out_free;
ir->input = input_dev;
/* Setup the proper handler based on the chip */
switch (dev->chip_id) {
default:
printk("Unrecognized cx231xx chip id: IR not supported\n");
goto err_out_free;
}
/* This is how often we ask the chip for IR information */
ir->polling = 100; /* ms */
/* init input device */
snprintf(ir->name, sizeof(ir->name), "cx231xx IR (%s)", dev->name);
usb_make_path(dev->udev, ir->phys, sizeof(ir->phys));
strlcat(ir->phys, "/input0", sizeof(ir->phys));
err = ir_input_init(input_dev, &ir->ir, IR_TYPE_OTHER);
if (err < 0)
goto err_out_free;
input_dev->name = ir->name;
input_dev->phys = ir->phys;
input_dev->id.bustype = BUS_USB;
input_dev->id.version = 1;
input_dev->id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
input_dev->id.product = le16_to_cpu(dev->udev->descriptor.idProduct);
input_dev->dev.parent = &dev->udev->dev;
/* record handles to ourself */
ir->dev = dev;
dev->ir = ir;
cx231xx_ir_start(ir);
/* all done */
err = ir_input_register(ir->input, dev->board.ir_codes, NULL);
if (err)
goto err_out_stop;
return 0;
err_out_stop:
cx231xx_ir_stop(ir);
dev->ir = NULL;
err_out_free:
kfree(ir);
return err;
}
int cx231xx_ir_fini(struct cx231xx *dev)
{
struct cx231xx_IR *ir = dev->ir;
/* skip detach on non attached boards */
if (!ir)
return 0;
cx231xx_ir_stop(ir);
ir_input_unregister(ir->input);
kfree(ir);
/* done */
dev->ir = NULL;
return 0;
}
