[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>

1 files changed, 122 insertions, 0 deletions

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 <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;
+
+	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;
+	}
+}