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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/drivers/media/video/cx231xx/cx231xx-input.c
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/*

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 *   cx231xx IR glue driver

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 *

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 *   Copyright (C) 2010 Mauro Carvalho Chehab <[email protected]>

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 *

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 *   Polaris (cx231xx) has its support for IR's with a design close to MCE.

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 *   however, a few designs are using an external I2C chip for IR, instead

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 *   of using the one provided by the chip.

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 *   This driver provides support for those extra devices

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 *

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 *   This program is free software; you can redistribute it and/or

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 *   modify it under the terms of the GNU General Public License as

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 *   published by the Free Software Foundation version 2.

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 *

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 *   This program is distributed in the hope that it will be useful,

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 *   but WITHOUT ANY WARRANTY; without even the implied warranty of

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 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

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 *   General Public License for more details.

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 */

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#include "cx231xx.h"

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#include <linux/usb.h>

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#include <linux/slab.h>

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#define MODULE_NAME "cx231xx-input"

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static int get_key_isdbt(struct IR_i2c *ir, u32 *ir_key,

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			 u32 *ir_raw)

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{

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	u8	cmd, scancode;

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	dev_dbg(&ir->rc->input_dev->dev, "%s\n", __func__);

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		/* poll IR chip */

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	if (1 != i2c_master_recv(ir->c, &cmd, 1))

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		return -EIO;

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	/* it seems that 0xFE indicates that a button is still hold

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	   down, while 0xff indicates that no button is hold

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	   down. 0xfe sequences are sometimes interrupted by 0xFF */

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	if (cmd == 0xff)

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		return 0;

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	scancode =

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		 ((cmd & 0x01) ? 0x80 : 0) |

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		 ((cmd & 0x02) ? 0x40 : 0) |

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		 ((cmd & 0x04) ? 0x20 : 0) |

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		 ((cmd & 0x08) ? 0x10 : 0) |

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		 ((cmd & 0x10) ? 0x08 : 0) |

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		 ((cmd & 0x20) ? 0x04 : 0) |

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		 ((cmd & 0x40) ? 0x02 : 0) |

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		 ((cmd & 0x80) ? 0x01 : 0);

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	dev_dbg(&ir->rc->input_dev->dev, "cmd %02x, scan = %02x\n",

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		cmd, scancode);

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	*ir_key = scancode;

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	*ir_raw = scancode;

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	return 1;

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}

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int cx231xx_ir_init(struct cx231xx *dev)

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{

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	struct i2c_board_info info;

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	u8 ir_i2c_bus;

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	dev_dbg(&dev->udev->dev, "%s\n", __func__);

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	/* Only initialize if a rc keycode map is defined */

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	if (!cx231xx_boards[dev->model].rc_map_name)

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		return -ENODEV;

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	request_module("ir-kbd-i2c");

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	memset(&info, 0, sizeof(struct i2c_board_info));

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	memset(&dev->init_data, 0, sizeof(dev->init_data));

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	dev->init_data.rc_dev = rc_allocate_device();

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	if (!dev->init_data.rc_dev)

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		return -ENOMEM;

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	dev->init_data.name = cx231xx_boards[dev->model].name;

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	strlcpy(info.type, "ir_video", I2C_NAME_SIZE);

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	info.platform_data = &dev->init_data;

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	/*

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	 * Board-dependent values

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	 *

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	 * For now, there's just one type of hardware design using

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	 * an i2c device.

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	 */

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	dev->init_data.get_key = get_key_isdbt;

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	dev->init_data.ir_codes = cx231xx_boards[dev->model].rc_map_name;

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	/* The i2c micro-controller only outputs the cmd part of NEC protocol */

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	dev->init_data.rc_dev->scanmask = 0xff;

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	dev->init_data.rc_dev->driver_name = "cx231xx";

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	dev->init_data.type = RC_TYPE_NEC;

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	info.addr = 0x30;

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	/* Load and bind ir-kbd-i2c */

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	ir_i2c_bus = cx231xx_boards[dev->model].ir_i2c_master;

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	dev_dbg(&dev->udev->dev, "Trying to bind ir at bus %d, addr 0x%02x\n",

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		ir_i2c_bus, info.addr);

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	i2c_new_device(&dev->i2c_bus[ir_i2c_bus].i2c_adap, &info);

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	return 0;

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}

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void cx231xx_ir_exit(struct cx231xx *dev)

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{

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}

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