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1// SPDX-License-Identifier: GPL-2.02// cx231xx IR glue driver3//4// Copyright (c) 2010 Mauro Carvalho Chehab <mchehab@kernel.org>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, instead8// of using the one provided by the chip.9// This driver provides support for those extra devices10 11#include "cx231xx.h"12#include <linux/slab.h>13#include <linux/bitrev.h>14 15#define MODULE_NAME "cx231xx-input"16 17static int get_key_isdbt(struct IR_i2c *ir, enum rc_proto *protocol,18 u32 *pscancode, u8 *toggle)19{20 int rc;21 u8 cmd, scancode;22 23 dev_dbg(&ir->rc->dev, "%s\n", __func__);24 25 /* poll IR chip */26 rc = i2c_master_recv(ir->c, &cmd, 1);27 if (rc < 0)28 return rc;29 if (rc != 1)30 return -EIO;31 32 /* it seems that 0xFE indicates that a button is still hold33 down, while 0xff indicates that no button is hold34 down. 0xfe sequences are sometimes interrupted by 0xFF */35 36 if (cmd == 0xff)37 return 0;38 39 scancode = bitrev8(cmd);40 41 dev_dbg(&ir->rc->dev, "cmd %02x, scan = %02x\n", cmd, scancode);42 43 *protocol = RC_PROTO_OTHER;44 *pscancode = scancode;45 *toggle = 0;46 return 1;47}48 49int cx231xx_ir_init(struct cx231xx *dev)50{51 struct i2c_board_info info;52 u8 ir_i2c_bus;53 54 dev_dbg(dev->dev, "%s\n", __func__);55 56 /* Only initialize if a rc keycode map is defined */57 if (!cx231xx_boards[dev->model].rc_map_name)58 return -ENODEV;59 60 request_module("ir-kbd-i2c");61 62 memset(&info, 0, sizeof(struct i2c_board_info));63 memset(&dev->init_data, 0, sizeof(dev->init_data));64 dev->init_data.rc_dev = rc_allocate_device(RC_DRIVER_SCANCODE);65 if (!dev->init_data.rc_dev)66 return -ENOMEM;67 68 dev->init_data.name = cx231xx_boards[dev->model].name;69 70 strscpy(info.type, "ir_video", I2C_NAME_SIZE);71 info.platform_data = &dev->init_data;72 73 /*74 * Board-dependent values75 *76 * For now, there's just one type of hardware design using77 * an i2c device.78 */79 dev->init_data.get_key = get_key_isdbt;80 dev->init_data.ir_codes = cx231xx_boards[dev->model].rc_map_name;81 /* The i2c micro-controller only outputs the cmd part of NEC protocol */82 dev->init_data.rc_dev->scancode_mask = 0xff;83 dev->init_data.rc_dev->driver_name = "cx231xx";84 dev->init_data.type = RC_PROTO_BIT_NEC;85 info.addr = 0x30;86 87 /* Load and bind ir-kbd-i2c */88 ir_i2c_bus = cx231xx_boards[dev->model].ir_i2c_master;89 dev_dbg(dev->dev, "Trying to bind ir at bus %d, addr 0x%02x\n",90 ir_i2c_bus, info.addr);91 dev->ir_i2c_client = i2c_new_client_device(92 cx231xx_get_i2c_adap(dev, ir_i2c_bus), &info);93 94 return 0;95}96 97void cx231xx_ir_exit(struct cx231xx *dev)98{99 i2c_unregister_device(dev->ir_i2c_client);100 dev->ir_i2c_client = NULL;101}102