diff options
Diffstat (limited to 'drivers/media/usb/cx231xx/cx231xx-input.c')
| -rw-r--r-- | drivers/media/usb/cx231xx/cx231xx-input.c | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/drivers/media/usb/cx231xx/cx231xx-input.c b/drivers/media/usb/cx231xx/cx231xx-input.c new file mode 100644 index 000000000000..96176e9db5a2 --- /dev/null +++ b/drivers/media/usb/cx231xx/cx231xx-input.c @@ -0,0 +1,119 @@ +/* + * 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) +{ + int rc; + u8 cmd, scancode; + + dev_dbg(&ir->rc->input_dev->dev, "%s\n", __func__); + + /* poll IR chip */ + rc = i2c_master_recv(ir->c, &cmd, 1); + if (rc < 0) + return rc; + if (rc != 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; + + scancode = + ((cmd & 0x01) ? 0x80 : 0) | + ((cmd & 0x02) ? 0x40 : 0) | + ((cmd & 0x04) ? 0x20 : 0) | + ((cmd & 0x08) ? 0x10 : 0) | + ((cmd & 0x10) ? 0x08 : 0) | + ((cmd & 0x20) ? 0x04 : 0) | + ((cmd & 0x40) ? 0x02 : 0) | + ((cmd & 0x80) ? 0x01 : 0); + + dev_dbg(&ir->rc->input_dev->dev, "cmd %02x, scan = %02x\n", + cmd, scancode); + + *ir_key = scancode; + *ir_raw = scancode; + return 1; +} + +int cx231xx_ir_init(struct cx231xx *dev) +{ + struct i2c_board_info info; + 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_name) + return -ENODEV; + + request_module("ir-kbd-i2c"); + + memset(&info, 0, sizeof(struct i2c_board_info)); + memset(&dev->init_data, 0, sizeof(dev->init_data)); + dev->init_data.rc_dev = rc_allocate_device(); + if (!dev->init_data.rc_dev) + return -ENOMEM; + + dev->init_data.name = cx231xx_boards[dev->model].name; + + strlcpy(info.type, "ir_video", I2C_NAME_SIZE); + info.platform_data = &dev->init_data; + + /* + * Board-dependent values + * + * For now, there's just one type of hardware design using + * an i2c device. + */ + dev->init_data.get_key = get_key_isdbt; + dev->init_data.ir_codes = cx231xx_boards[dev->model].rc_map_name; + /* The i2c micro-controller only outputs the cmd part of NEC protocol */ + dev->init_data.rc_dev->scanmask = 0xff; + dev->init_data.rc_dev->driver_name = "cx231xx"; + dev->init_data.type = RC_TYPE_NEC; + info.addr = 0x30; + + /* Load and bind ir-kbd-i2c */ + ir_i2c_bus = cx231xx_boards[dev->model].ir_i2c_master; + dev_dbg(&dev->udev->dev, "Trying to bind ir at bus %d, addr 0x%02x\n", + ir_i2c_bus, info.addr); + dev->ir_i2c_client = i2c_new_device(&dev->i2c_bus[ir_i2c_bus].i2c_adap, &info); + + return 0; +} + +void cx231xx_ir_exit(struct cx231xx *dev) +{ + if (dev->ir_i2c_client) + i2c_unregister_device(dev->ir_i2c_client); + dev->ir_i2c_client = NULL; +} |