1 /* 2 * cx231xx IR glue driver 3 * 4 * Copyright (C) 2010 Mauro Carvalho Chehab 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 27 static 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 67 int 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_BIT_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 } 113 114 void 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 } 120