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/slab.h> 23 #include <linux/bitrev.h> 24 25 #define MODULE_NAME "cx231xx-input" 26 27 static int get_key_isdbt(struct IR_i2c *ir, enum rc_type *protocol, 28 u32 *pscancode, u8 *toggle) 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 = bitrev8(cmd); 50 51 dev_dbg(&ir->rc->input_dev->dev, "cmd %02x, scan = %02x\n", 52 cmd, scancode); 53 54 *protocol = RC_TYPE_OTHER; 55 *pscancode = scancode; 56 *toggle = 0; 57 return 1; 58 } 59 60 int cx231xx_ir_init(struct cx231xx *dev) 61 { 62 struct i2c_board_info info; 63 u8 ir_i2c_bus; 64 65 dev_dbg(dev->dev, "%s\n", __func__); 66 67 /* Only initialize if a rc keycode map is defined */ 68 if (!cx231xx_boards[dev->model].rc_map_name) 69 return -ENODEV; 70 71 request_module("ir-kbd-i2c"); 72 73 memset(&info, 0, sizeof(struct i2c_board_info)); 74 memset(&dev->init_data, 0, sizeof(dev->init_data)); 75 dev->init_data.rc_dev = rc_allocate_device(RC_DRIVER_SCANCODE); 76 if (!dev->init_data.rc_dev) 77 return -ENOMEM; 78 79 dev->init_data.name = cx231xx_boards[dev->model].name; 80 81 strlcpy(info.type, "ir_video", I2C_NAME_SIZE); 82 info.platform_data = &dev->init_data; 83 84 /* 85 * Board-dependent values 86 * 87 * For now, there's just one type of hardware design using 88 * an i2c device. 89 */ 90 dev->init_data.get_key = get_key_isdbt; 91 dev->init_data.ir_codes = cx231xx_boards[dev->model].rc_map_name; 92 /* The i2c micro-controller only outputs the cmd part of NEC protocol */ 93 dev->init_data.rc_dev->scancode_mask = 0xff; 94 dev->init_data.rc_dev->driver_name = "cx231xx"; 95 dev->init_data.type = RC_BIT_NEC; 96 info.addr = 0x30; 97 98 /* Load and bind ir-kbd-i2c */ 99 ir_i2c_bus = cx231xx_boards[dev->model].ir_i2c_master; 100 dev_dbg(dev->dev, "Trying to bind ir at bus %d, addr 0x%02x\n", 101 ir_i2c_bus, info.addr); 102 dev->ir_i2c_client = i2c_new_device( 103 cx231xx_get_i2c_adap(dev, ir_i2c_bus), &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