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 #include <linux/bitrev.h> 25 26 #define MODULE_NAME "cx231xx-input" 27 28 static int get_key_isdbt(struct IR_i2c *ir, enum rc_type *protocol, 29 u32 *pscancode, u8 *toggle) 30 { 31 int rc; 32 u8 cmd, scancode; 33 34 dev_dbg(&ir->rc->input_dev->dev, "%s\n", __func__); 35 36 /* poll IR chip */ 37 rc = i2c_master_recv(ir->c, &cmd, 1); 38 if (rc < 0) 39 return rc; 40 if (rc != 1) 41 return -EIO; 42 43 /* it seems that 0xFE indicates that a button is still hold 44 down, while 0xff indicates that no button is hold 45 down. 0xfe sequences are sometimes interrupted by 0xFF */ 46 47 if (cmd == 0xff) 48 return 0; 49 50 scancode = bitrev8(cmd); 51 52 dev_dbg(&ir->rc->input_dev->dev, "cmd %02x, scan = %02x\n", 53 cmd, scancode); 54 55 *protocol = RC_TYPE_OTHER; 56 *pscancode = scancode; 57 *toggle = 0; 58 return 1; 59 } 60 61 int cx231xx_ir_init(struct cx231xx *dev) 62 { 63 struct i2c_board_info info; 64 u8 ir_i2c_bus; 65 66 dev_dbg(&dev->udev->dev, "%s\n", __func__); 67 68 /* Only initialize if a rc keycode map is defined */ 69 if (!cx231xx_boards[dev->model].rc_map_name) 70 return -ENODEV; 71 72 request_module("ir-kbd-i2c"); 73 74 memset(&info, 0, sizeof(struct i2c_board_info)); 75 memset(&dev->init_data, 0, sizeof(dev->init_data)); 76 dev->init_data.rc_dev = rc_allocate_device(); 77 if (!dev->init_data.rc_dev) 78 return -ENOMEM; 79 80 dev->init_data.name = cx231xx_boards[dev->model].name; 81 82 strlcpy(info.type, "ir_video", I2C_NAME_SIZE); 83 info.platform_data = &dev->init_data; 84 85 /* 86 * Board-dependent values 87 * 88 * For now, there's just one type of hardware design using 89 * an i2c device. 90 */ 91 dev->init_data.get_key = get_key_isdbt; 92 dev->init_data.ir_codes = cx231xx_boards[dev->model].rc_map_name; 93 /* The i2c micro-controller only outputs the cmd part of NEC protocol */ 94 dev->init_data.rc_dev->scancode_mask = 0xff; 95 dev->init_data.rc_dev->driver_name = "cx231xx"; 96 dev->init_data.type = RC_BIT_NEC; 97 info.addr = 0x30; 98 99 /* Load and bind ir-kbd-i2c */ 100 ir_i2c_bus = cx231xx_boards[dev->model].ir_i2c_master; 101 dev_dbg(&dev->udev->dev, "Trying to bind ir at bus %d, addr 0x%02x\n", 102 ir_i2c_bus, info.addr); 103 dev->ir_i2c_client = i2c_new_device(&dev->i2c_bus[ir_i2c_bus].i2c_adap, &info); 104 105 return 0; 106 } 107 108 void cx231xx_ir_exit(struct cx231xx *dev) 109 { 110 if (dev->ir_i2c_client) 111 i2c_unregister_device(dev->ir_i2c_client); 112 dev->ir_i2c_client = NULL; 113 } 114