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/*
* cx231xx IR glue driver
*
* Copyright (C) 2010 Mauro Carvalho Chehab <mchehab@redhat.com>
*
* 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/usb.h>
#include <linux/slab.h>
#define MODULE_NAME "cx231xx-input"
static int get_key_isdbt(struct IR_i2c *ir, u32 *ir_key,
u32 *ir_raw)
{
u8 cmd;
/* poll IR chip */
if (1 != i2c_master_recv(ir->c, &cmd, 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;
dev_dbg(&ir->input->dev, "scancode = %02x\n", cmd);
*ir_key = cmd;
*ir_raw = cmd;
return 1;
}
int cx231xx_ir_init(struct cx231xx *dev)
{
struct input_dev *input_dev;
struct i2c_board_info info;
int rc;
u8 ir_i2c_bus;
dev_dbg(&dev->udev->dev, "%s\n", __func__);
/* Only initialize if a rc keycode map is defined */
if (!cx231xx_boards[dev->model].rc_map)
return -ENODEV;
input_dev = input_allocate_device();
if (!input_dev)
return -ENOMEM;
request_module("ir-kbd-i2c");
memset(&info, 0, sizeof(struct i2c_board_info));
memset(&dev->ir.init_data, 0, sizeof(dev->ir.init_data));
dev->ir.input_dev = input_dev;
dev->ir.init_data.name = cx231xx_boards[dev->model].name;
dev->ir.props.priv = dev;
dev->ir.props.allowed_protos = IR_TYPE_NEC;
snprintf(dev->ir.name, sizeof(dev->ir.name),
"cx231xx IR (%s)", cx231xx_boards[dev->model].name);
usb_make_path(dev->udev, dev->ir.phys, sizeof(dev->ir.phys));
strlcat(dev->ir.phys, "/input0", sizeof(dev->ir.phys));
strlcpy(info.type, "ir_video", I2C_NAME_SIZE);
info.platform_data = &dev->ir.init_data;
input_dev->name = dev->ir.name;
input_dev->phys = dev->ir.phys;
input_dev->dev.parent = &dev->udev->dev;
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);
/*
* Board-dependent values
*
* For now, there's just one type of hardware design using
* an i2c device.
*/
dev->ir.init_data.get_key = get_key_isdbt;
dev->ir.init_data.ir_codes = cx231xx_boards[dev->model].rc_map;
/* The i2c micro-controller only outputs the cmd part of NEC protocol */
dev->ir.props.scanmask = 0xff;
info.addr = 0x30;
rc = ir_input_register(input_dev, cx231xx_boards[dev->model].rc_map,
&dev->ir.props, MODULE_NAME);
if (rc < 0)
return rc;
/* Load and bind ir-kbd-i2c */
ir_i2c_bus = cx231xx_boards[dev->model].ir_i2c_master;
i2c_new_device(&dev->i2c_bus[ir_i2c_bus].i2c_adap, &info);
return rc;
}
void cx231xx_ir_exit(struct cx231xx *dev)
{
if (dev->ir.input_dev) {
ir_input_unregister(dev->ir.input_dev);
dev->ir.input_dev = NULL;
}
}
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