From 9ab66912e0cd671fbea1b99e8a37d11b14d50baf Mon Sep 17 00:00:00 2001 From: Mauro Carvalho Chehab Date: Sat, 23 Oct 2010 13:28:33 -0300 Subject: [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 --- drivers/media/video/cx231xx/cx231xx-input.c | 122 ++++++++++++++++++++++++++++ 1 file changed, 122 insertions(+) create mode 100644 drivers/media/video/cx231xx/cx231xx-input.c (limited to 'drivers/media/video/cx231xx/cx231xx-input.c') diff --git a/drivers/media/video/cx231xx/cx231xx-input.c b/drivers/media/video/cx231xx/cx231xx-input.c new file mode 100644 index 000000000000..6725244c400c --- /dev/null +++ b/drivers/media/video/cx231xx/cx231xx-input.c @@ -0,0 +1,122 @@ +/* + * cx231xx IR glue driver + * + * Copyright (C) 2010 Mauro Carvalho Chehab + * + * 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 +#include + +#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; + + dev_dbg(&ir->input->dev, "scancode = %02x\n", cmd); + + *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__); + + /* 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; + + request_module("ir-kbd-i2c"); + + 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; + + /* 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); + + return rc; +} + +void cx231xx_ir_exit(struct cx231xx *dev) +{ + if (dev->ir.input_dev) { + ir_input_unregister(dev->ir.input_dev); + dev->ir.input_dev = NULL; + } +} -- cgit v1.2.3-59-g8ed1b