cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

cx231xx-input.c (2666B)

      1// SPDX-License-Identifier: GPL-2.0
      2// cx231xx IR glue driver
      3//
      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, instead
      8// of using the one provided by the chip.
      9// This driver provides support for those extra devices
     10
     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 hold
     33	   down, while 0xff indicates that no button is hold
     34	   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 values
     75	 *
     76	 * For now, there's just one type of hardware design using
     77	 * 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}