// SPDX-License-Identifier: GPL-2.0
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// cx231xx IR glue driver
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//
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// Copyright (c) 2010 Mauro Carvalho Chehab <mchehab@kernel.org>
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//
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// Polaris (cx231xx) has its support for IR's with a design close to MCE.
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// however, a few designs are using an external I2C chip for IR, instead
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// of using the one provided by the chip.
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// This driver provides support for those extra devices
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#include "cx231xx.h"
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#include <linux/slab.h>
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#include <linux/bitrev.h>
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#define MODULE_NAME "cx231xx-input"
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static int get_key_isdbt(struct IR_i2c *ir, enum rc_proto *protocol,
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u32 *pscancode, u8 *toggle)
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{
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int rc;
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u8 cmd, scancode;
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dev_dbg(&ir->rc->dev, "%s\n", __func__);
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/* poll IR chip */
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rc = i2c_master_recv(ir->c, &cmd, 1);
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if (rc < 0)
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return rc;
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if (rc != 1)
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return -EIO;
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/* it seems that 0xFE indicates that a button is still hold
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down, while 0xff indicates that no button is hold
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down. 0xfe sequences are sometimes interrupted by 0xFF */
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if (cmd == 0xff)
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return 0;
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scancode = bitrev8(cmd);
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dev_dbg(&ir->rc->dev, "cmd %02x, scan = %02x\n", cmd, scancode);
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*protocol = RC_PROTO_OTHER;
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*pscancode = scancode;
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*toggle = 0;
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return 1;
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}
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int cx231xx_ir_init(struct cx231xx *dev)
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{
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struct i2c_board_info info;
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u8 ir_i2c_bus;
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dev_dbg(dev->dev, "%s\n", __func__);
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/* Only initialize if a rc keycode map is defined */
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if (!cx231xx_boards[dev->model].rc_map_name)
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return -ENODEV;
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request_module("ir-kbd-i2c");
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memset(&info, 0, sizeof(struct i2c_board_info));
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memset(&dev->init_data, 0, sizeof(dev->init_data));
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dev->init_data.rc_dev = rc_allocate_device(RC_DRIVER_SCANCODE);
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if (!dev->init_data.rc_dev)
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return -ENOMEM;
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dev->init_data.name = cx231xx_boards[dev->model].name;
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strscpy(info.type, "ir_video", I2C_NAME_SIZE);
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info.platform_data = &dev->init_data;
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/*
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* Board-dependent values
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*
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* For now, there's just one type of hardware design using
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* an i2c device.
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*/
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dev->init_data.get_key = get_key_isdbt;
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dev->init_data.ir_codes = cx231xx_boards[dev->model].rc_map_name;
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/* The i2c micro-controller only outputs the cmd part of NEC protocol */
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dev->init_data.rc_dev->scancode_mask = 0xff;
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dev->init_data.rc_dev->driver_name = "cx231xx";
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dev->init_data.type = RC_PROTO_BIT_NEC;
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info.addr = 0x30;
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/* Load and bind ir-kbd-i2c */
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ir_i2c_bus = cx231xx_boards[dev->model].ir_i2c_master;
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dev_dbg(dev->dev, "Trying to bind ir at bus %d, addr 0x%02x\n",
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ir_i2c_bus, info.addr);
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dev->ir_i2c_client = i2c_new_client_device(
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cx231xx_get_i2c_adap(dev, ir_i2c_bus), &info);
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return 0;
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}
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void cx231xx_ir_exit(struct cx231xx *dev)
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{
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i2c_unregister_device(dev->ir_i2c_client);
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dev->ir_i2c_client = NULL;
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}
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