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[media] cx231xx: Add a driver for I2C-based IR
Although cx231xx has a very good IR support, already supported by mceusb driver, some designs decided to add a separate I2C microcontroller chip in order to handle IR. Due to that, add a glue to ir-kbd-i2c is needed, in order to support those devices. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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Mauro Carvalho Chehab
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Dec 29, 2010
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,122 @@ | ||
| /* | ||
| * cx231xx IR glue driver | ||
| * | ||
| * Copyright (C) 2010 Mauro Carvalho Chehab <mchehab@redhat.com> | ||
| * | ||
| * Polaris (cx231xx) has its support for IR's with a design close to MCE. | ||
| * however, a few designs are using an external I2C chip for IR, instead | ||
| * of using the one provided by the chip. | ||
| * This driver provides support for those extra devices | ||
| * | ||
| * This program is free software; you can redistribute it and/or | ||
| * modify it under the terms of the GNU General Public License as | ||
| * published by the Free Software Foundation version 2. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| * General Public License for more details. | ||
| */ | ||
|
|
||
| #include "cx231xx.h" | ||
| #include <linux/usb.h> | ||
| #include <linux/slab.h> | ||
|
|
||
| #define MODULE_NAME "cx231xx-input" | ||
|
|
||
| static int get_key_isdbt(struct IR_i2c *ir, u32 *ir_key, | ||
| u32 *ir_raw) | ||
| { | ||
| u8 cmd; | ||
|
|
||
| /* poll IR chip */ | ||
| if (1 != i2c_master_recv(ir->c, &cmd, 1)) | ||
| return -EIO; | ||
|
|
||
| /* it seems that 0xFE indicates that a button is still hold | ||
| down, while 0xff indicates that no button is hold | ||
| down. 0xfe sequences are sometimes interrupted by 0xFF */ | ||
|
|
||
| if (cmd == 0xff) | ||
| return 0; | ||
|
|
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| dev_dbg(&ir->input->dev, "scancode = %02x\n", cmd); | ||
|
|
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| *ir_key = cmd; | ||
| *ir_raw = cmd; | ||
| return 1; | ||
| } | ||
|
|
||
| int cx231xx_ir_init(struct cx231xx *dev) | ||
| { | ||
| struct input_dev *input_dev; | ||
| struct i2c_board_info info; | ||
| int rc; | ||
| u8 ir_i2c_bus; | ||
|
|
||
| dev_dbg(&dev->udev->dev, "%s\n", __func__); | ||
|
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| /* Only initialize if a rc keycode map is defined */ | ||
| if (!cx231xx_boards[dev->model].rc_map) | ||
| return -ENODEV; | ||
|
|
||
| input_dev = input_allocate_device(); | ||
| if (!input_dev) | ||
| return -ENOMEM; | ||
|
|
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| request_module("ir-kbd-i2c"); | ||
|
|
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| memset(&info, 0, sizeof(struct i2c_board_info)); | ||
| memset(&dev->ir.init_data, 0, sizeof(dev->ir.init_data)); | ||
|
|
||
| dev->ir.input_dev = input_dev; | ||
| dev->ir.init_data.name = cx231xx_boards[dev->model].name; | ||
| dev->ir.props.priv = dev; | ||
| dev->ir.props.allowed_protos = IR_TYPE_NEC; | ||
| snprintf(dev->ir.name, sizeof(dev->ir.name), | ||
| "cx231xx IR (%s)", cx231xx_boards[dev->model].name); | ||
| usb_make_path(dev->udev, dev->ir.phys, sizeof(dev->ir.phys)); | ||
| strlcat(dev->ir.phys, "/input0", sizeof(dev->ir.phys)); | ||
|
|
||
| strlcpy(info.type, "ir_video", I2C_NAME_SIZE); | ||
| info.platform_data = &dev->ir.init_data; | ||
|
|
||
| input_dev->name = dev->ir.name; | ||
| input_dev->phys = dev->ir.phys; | ||
| input_dev->dev.parent = &dev->udev->dev; | ||
| input_dev->id.bustype = BUS_USB; | ||
| input_dev->id.version = 1; | ||
| input_dev->id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor); | ||
| input_dev->id.product = le16_to_cpu(dev->udev->descriptor.idProduct); | ||
|
|
||
| /* | ||
| * Board-dependent values | ||
| * | ||
| * For now, there's just one type of hardware design using | ||
| * an i2c device. | ||
| */ | ||
| dev->ir.init_data.get_key = get_key_isdbt; | ||
| dev->ir.init_data.ir_codes = cx231xx_boards[dev->model].rc_map; | ||
| /* The i2c micro-controller only outputs the cmd part of NEC protocol */ | ||
| dev->ir.props.scanmask = 0xff; | ||
| info.addr = 0x30; | ||
|
|
||
| rc = ir_input_register(input_dev, cx231xx_boards[dev->model].rc_map, | ||
| &dev->ir.props, MODULE_NAME); | ||
| if (rc < 0) | ||
| return rc; | ||
|
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||
| /* Load and bind ir-kbd-i2c */ | ||
| ir_i2c_bus = cx231xx_boards[dev->model].ir_i2c_master; | ||
| i2c_new_device(&dev->i2c_bus[ir_i2c_bus].i2c_adap, &info); | ||
|
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||
| return rc; | ||
| } | ||
|
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| void cx231xx_ir_exit(struct cx231xx *dev) | ||
| { | ||
| if (dev->ir.input_dev) { | ||
| ir_input_unregister(dev->ir.input_dev); | ||
| dev->ir.input_dev = NULL; | ||
| } | ||
| } |
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