113 lines
3.0 KiB
C
113 lines
3.0 KiB
C
/*
|
|
* cx231xx IR glue driver
|
|
*
|
|
* Copyright (C) 2010 Mauro Carvalho Chehab
|
|
*
|
|
* Polaris (cx231xx) has its support for IR's with a design close to MCE.
|
|
* however, a few designs are using an external I2C chip for IR, instead
|
|
* of using the one provided by the chip.
|
|
* This driver provides support for those extra devices
|
|
*
|
|
* 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 version 2.
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include "cx231xx.h"
|
|
#include <linux/slab.h>
|
|
#include <linux/bitrev.h>
|
|
|
|
#define MODULE_NAME "cx231xx-input"
|
|
|
|
static int get_key_isdbt(struct IR_i2c *ir, enum rc_proto *protocol,
|
|
u32 *pscancode, u8 *toggle)
|
|
{
|
|
int rc;
|
|
u8 cmd, scancode;
|
|
|
|
dev_dbg(&ir->rc->dev, "%s\n", __func__);
|
|
|
|
/* poll IR chip */
|
|
rc = i2c_master_recv(ir->c, &cmd, 1);
|
|
if (rc < 0)
|
|
return rc;
|
|
if (rc != 1)
|
|
return -EIO;
|
|
|
|
/* it seems that 0xFE indicates that a button is still hold
|
|
down, while 0xff indicates that no button is hold
|
|
down. 0xfe sequences are sometimes interrupted by 0xFF */
|
|
|
|
if (cmd == 0xff)
|
|
return 0;
|
|
|
|
scancode = bitrev8(cmd);
|
|
|
|
dev_dbg(&ir->rc->dev, "cmd %02x, scan = %02x\n", cmd, scancode);
|
|
|
|
*protocol = RC_PROTO_OTHER;
|
|
*pscancode = scancode;
|
|
*toggle = 0;
|
|
return 1;
|
|
}
|
|
|
|
int cx231xx_ir_init(struct cx231xx *dev)
|
|
{
|
|
struct i2c_board_info info;
|
|
u8 ir_i2c_bus;
|
|
|
|
dev_dbg(dev->dev, "%s\n", __func__);
|
|
|
|
/* Only initialize if a rc keycode map is defined */
|
|
if (!cx231xx_boards[dev->model].rc_map_name)
|
|
return -ENODEV;
|
|
|
|
request_module("ir-kbd-i2c");
|
|
|
|
memset(&info, 0, sizeof(struct i2c_board_info));
|
|
memset(&dev->init_data, 0, sizeof(dev->init_data));
|
|
dev->init_data.rc_dev = rc_allocate_device(RC_DRIVER_SCANCODE);
|
|
if (!dev->init_data.rc_dev)
|
|
return -ENOMEM;
|
|
|
|
dev->init_data.name = cx231xx_boards[dev->model].name;
|
|
|
|
strlcpy(info.type, "ir_video", I2C_NAME_SIZE);
|
|
info.platform_data = &dev->init_data;
|
|
|
|
/*
|
|
* Board-dependent values
|
|
*
|
|
* For now, there's just one type of hardware design using
|
|
* an i2c device.
|
|
*/
|
|
dev->init_data.get_key = get_key_isdbt;
|
|
dev->init_data.ir_codes = cx231xx_boards[dev->model].rc_map_name;
|
|
/* The i2c micro-controller only outputs the cmd part of NEC protocol */
|
|
dev->init_data.rc_dev->scancode_mask = 0xff;
|
|
dev->init_data.rc_dev->driver_name = "cx231xx";
|
|
dev->init_data.type = RC_PROTO_BIT_NEC;
|
|
info.addr = 0x30;
|
|
|
|
/* Load and bind ir-kbd-i2c */
|
|
ir_i2c_bus = cx231xx_boards[dev->model].ir_i2c_master;
|
|
dev_dbg(dev->dev, "Trying to bind ir at bus %d, addr 0x%02x\n",
|
|
ir_i2c_bus, info.addr);
|
|
dev->ir_i2c_client = i2c_new_device(
|
|
cx231xx_get_i2c_adap(dev, ir_i2c_bus), &info);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void cx231xx_ir_exit(struct cx231xx *dev)
|
|
{
|
|
if (dev->ir_i2c_client)
|
|
i2c_unregister_device(dev->ir_i2c_client);
|
|
dev->ir_i2c_client = NULL;
|
|
}
|