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->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->dev, "cmd %02x, scan = %02x\n", cmd, scancode); 52 53 *protocol = RC_TYPE_OTHER; 54 *pscancode = scancode; 55 *toggle = 0; 56 return 1; 57 } 58 59 int cx231xx_ir_init(struct cx231xx *dev) 60 { 61 struct i2c_board_info info; 62 u8 ir_i2c_bus; 63 64 dev_dbg(dev->dev, "%s\n", __func__); 65 66 /* Only initialize if a rc keycode map is defined */ 67 if (!cx231xx_boards[dev->model].rc_map_name) 68 return -ENODEV; 69 70 request_module("ir-kbd-i2c"); 71 72 memset(&info, 0, sizeof(struct i2c_board_info)); 73 memset(&dev->init_data, 0, sizeof(dev->init_data)); 74 dev->init_data.rc_dev = rc_allocate_device(RC_DRIVER_SCANCODE); 75 if (!dev->init_data.rc_dev) 76 return -ENOMEM; 77 78 dev->init_data.name = cx231xx_boards[dev->model].name; 79 80 strlcpy(info.type, "ir_video", I2C_NAME_SIZE); 81 info.platform_data = &dev->init_data; 82 83 /* 84 * Board-dependent values 85 * 86 * For now, there's just one type of hardware design using 87 * an i2c device. 88 */ 89 dev->init_data.get_key = get_key_isdbt; 90 dev->init_data.ir_codes = cx231xx_boards[dev->model].rc_map_name; 91 /* The i2c micro-controller only outputs the cmd part of NEC protocol */ 92 dev->init_data.rc_dev->scancode_mask = 0xff; 93 dev->init_data.rc_dev->driver_name = "cx231xx"; 94 dev->init_data.type = RC_BIT_NEC; 95 info.addr = 0x30; 96 97 /* Load and bind ir-kbd-i2c */ 98 ir_i2c_bus = cx231xx_boards[dev->model].ir_i2c_master; 99 dev_dbg(dev->dev, "Trying to bind ir at bus %d, addr 0x%02x\n", 100 ir_i2c_bus, info.addr); 101 dev->ir_i2c_client = i2c_new_device( 102 cx231xx_get_i2c_adap(dev, ir_i2c_bus), &info); 103 104 return 0; 105 } 106 107 void cx231xx_ir_exit(struct cx231xx *dev) 108 { 109 if (dev->ir_i2c_client) 110 i2c_unregister_device(dev->ir_i2c_client); 111 dev->ir_i2c_client = NULL; 112 } 113