1/*
  2 *   cx231xx IR glue driver
  3 *
  4 *   Copyright (C) 2010 Mauro Carvalho Chehab <mchehab@redhat.com>
  5 *
  6 *   Polaris (cx231xx) has its support for IR's with a design close to MCE.
  7 *   however, a few designs are using an external I2C chip for IR, instead
  8 *   of using the one provided by the chip.
  9 *   This driver provides support for those extra devices
 10 *
 11 *   This program is free software; you can redistribute it and/or
 12 *   modify it under the terms of the GNU General Public License as
 13 *   published by the Free Software Foundation version 2.
 14 *
 15 *   This program is distributed in the hope that it will be useful,
 16 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 17 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 18 *   General Public License for more details.
 19 */
 20
 21#include "cx231xx.h"
 22#include <linux/usb.h>
 23#include <linux/slab.h>
 24
 25#define MODULE_NAME "cx231xx-input"
 26
 27static int get_key_isdbt(struct IR_i2c *ir, u32 *ir_key,
 28			 u32 *ir_raw)
 29{
 30	int	rc;
 31	u8	cmd, scancode;
 32
 33	dev_dbg(&ir->rc->input_dev->dev, "%s\n", __func__);
 34
 35		/* poll IR chip */
 36	rc = i2c_master_recv(ir->c, &cmd, 1);
 37	if (rc < 0)
 38		return rc;
 39	if (rc != 1)
 40		return -EIO;
 41
 42	/* it seems that 0xFE indicates that a button is still hold
 43	   down, while 0xff indicates that no button is hold
 44	   down. 0xfe sequences are sometimes interrupted by 0xFF */
 45
 46	if (cmd == 0xff)
 47		return 0;
 48
 49	scancode =
 50		 ((cmd & 0x01) ? 0x80 : 0) |
 51		 ((cmd & 0x02) ? 0x40 : 0) |
 52		 ((cmd & 0x04) ? 0x20 : 0) |
 53		 ((cmd & 0x08) ? 0x10 : 0) |
 54		 ((cmd & 0x10) ? 0x08 : 0) |
 55		 ((cmd & 0x20) ? 0x04 : 0) |
 56		 ((cmd & 0x40) ? 0x02 : 0) |
 57		 ((cmd & 0x80) ? 0x01 : 0);
 58
 59	dev_dbg(&ir->rc->input_dev->dev, "cmd %02x, scan = %02x\n",
 60		cmd, scancode);
 61
 62	*ir_key = scancode;
 63	*ir_raw = scancode;
 64	return 1;
 65}
 66
 67int cx231xx_ir_init(struct cx231xx *dev)
 68{
 69	struct i2c_board_info info;
 70	u8 ir_i2c_bus;
 71
 72	dev_dbg(&dev->udev->dev, "%s\n", __func__);
 73
 74	/* Only initialize if a rc keycode map is defined */
 75	if (!cx231xx_boards[dev->model].rc_map_name)
 76		return -ENODEV;
 77
 78	request_module("ir-kbd-i2c");
 79
 80	memset(&info, 0, sizeof(struct i2c_board_info));
 81	memset(&dev->init_data, 0, sizeof(dev->init_data));
 82	dev->init_data.rc_dev = rc_allocate_device();
 83	if (!dev->init_data.rc_dev)
 84		return -ENOMEM;
 85
 86	dev->init_data.name = cx231xx_boards[dev->model].name;
 87
 88	strlcpy(info.type, "ir_video", I2C_NAME_SIZE);
 89	info.platform_data = &dev->init_data;
 90
 91	/*
 92	 * Board-dependent values
 93	 *
 94	 * For now, there's just one type of hardware design using
 95	 * an i2c device.
 96	 */
 97	dev->init_data.get_key = get_key_isdbt;
 98	dev->init_data.ir_codes = cx231xx_boards[dev->model].rc_map_name;
 99	/* The i2c micro-controller only outputs the cmd part of NEC protocol */
100	dev->init_data.rc_dev->scanmask = 0xff;
101	dev->init_data.rc_dev->driver_name = "cx231xx";
102	dev->init_data.type = RC_TYPE_NEC;
103	info.addr = 0x30;
104
105	/* Load and bind ir-kbd-i2c */
106	ir_i2c_bus = cx231xx_boards[dev->model].ir_i2c_master;
107	dev_dbg(&dev->udev->dev, "Trying to bind ir at bus %d, addr 0x%02x\n",
108		ir_i2c_bus, info.addr);
109	dev->ir_i2c_client = i2c_new_device(&dev->i2c_bus[ir_i2c_bus].i2c_adap, &info);
110
111	return 0;
112}
113
114void cx231xx_ir_exit(struct cx231xx *dev)
115{
116	if (dev->ir_i2c_client)
117		i2c_unregister_device(dev->ir_i2c_client);
118	dev->ir_i2c_client = NULL;
119}