[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>

drivers/media/video/cx231xx/Kconfig

@@ -14,6 +14,19 @@ config VIDEO_CX231XX
 	  To compile this driver as a module, choose M here: the
 	  module will be called cx231xx
 
+config VIDEO_CX231XX_RC
+	bool "Conexant cx231xx Remote Controller additional support"
+	depends on VIDEO_IR
+	depends on VIDEO_CX231XX
+	default y
+	---help---
+	  cx231xx hardware has a builtin RX/TX support. However, a few
+	  designs opted to not use it, but, instead, some other hardware.
+	  This module enables the usage of those other hardware, like the
+	  ones used with ISDB-T boards.
+
+	  On most cases, all you need for IR is mceusb module.
+
 config VIDEO_CX231XX_ALSA
 	tristate "Conexant Cx231xx ALSA audio module"
 	depends on VIDEO_CX231XX && SND

drivers/media/video/cx231xx/Makefile

-cx231xx-objs     := cx231xx-video.o cx231xx-i2c.o cx231xx-cards.o cx231xx-core.o \
-		    cx231xx-avcore.o cx231xx-417.o cx231xx-pcb-cfg.o cx231xx-vbi.o
+cx231xx-y += cx231xx-video.o cx231xx-i2c.o cx231xx-cards.o cx231xx-core.o
+cx231xx-y += cx231xx-avcore.o cx231xx-417.o cx231xx-pcb-cfg.o cx231xx-vbi.o
+cx231xx-$(CONFIG_VIDEO_CX231XX_RC) += cx231xx-input.o
 
 cx231xx-alsa-objs := cx231xx-audio.o
 

drivers/media/video/cx231xx/cx231xx-cards.c

@@ -663,8 +663,11 @@ void cx231xx_release_resources(struct cx231xx *dev)
 
 	cx231xx_remove_from_devlist(dev);
 
+	/* Release I2C buses */
 	cx231xx_dev_uninit(dev);
 
+	cx231xx_ir_exit(dev);
+
 	usb_put_dev(dev->udev);
 
 	/* Mark device as unused */
@@ -782,6 +785,8 @@ static int cx231xx_init_dev(struct cx231xx **devhandle, struct usb_device *udev,
 		goto fail_reg_devices;
 	}
 
+	cx231xx_ir_init(dev);
+
 	cx231xx_init_extension(dev);
 
 	return 0;

drivers/media/video/cx231xx/cx231xx-core.c

@@ -1289,7 +1289,7 @@ int cx231xx_dev_init(struct cx231xx *dev)
 	/* Internal Master 3 Bus */
 	dev->i2c_bus[2].nr = 2;
 	dev->i2c_bus[2].dev = dev;
-	dev->i2c_bus[2].i2c_period = I2C_SPEED_400K;	/* 400kHz */
+	dev->i2c_bus[2].i2c_period = I2C_SPEED_100K;	/* 100kHz */
 	dev->i2c_bus[2].i2c_nostop = 0;
 	dev->i2c_bus[2].i2c_reserve = 0;
 

drivers/media/video/cx231xx/cx231xx-input.c

+/*
+ *   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;
+	}
+}

drivers/media/video/cx231xx/cx231xx.h

@@ -35,6 +35,7 @@
 #include <media/videobuf-vmalloc.h>
 #include <media/v4l2-device.h>
 #include <media/ir-core.h>
+#include <media/ir-kbd-i2c.h>
 #include <media/videobuf-dvb.h>
 
 #include "cx231xx-reg.h"
@@ -345,6 +346,10 @@ struct cx231xx_board {
 	/* i2c masters */
 	u8 tuner_i2c_master;
 	u8 demod_i2c_master;
+	u8 ir_i2c_master;
+
+	/* for devices with I2C chips for IR */
+	char *rc_map;
 
 	unsigned int max_range_640_480:1;
 	unsigned int has_dvb:1;
@@ -597,6 +602,17 @@ struct cx231xx_tsport {
 	void                       *port_priv;
 };
 
+struct cx231xx_ir_t {
+	struct input_dev *input_dev;
+	char name[40];
+	char phys[32];
+
+	struct ir_dev_props props;
+
+	/* I2C keyboard data */
+	struct IR_i2c_init_data    init_data;
+};
+
 /* main device struct */
 struct cx231xx {
 	/* generic device properties */
@@ -606,6 +622,9 @@ struct cx231xx {
 
 	struct cx231xx_board board;
 
+	/* For I2C IR support */
+	struct cx231xx_ir_t ir;
+
 	unsigned int stream_on:1;	/* Locks streams */
 	unsigned int vbi_stream_on:1;	/* Locks streams for VBI */
 	unsigned int has_audio_class:1;
@@ -617,8 +636,6 @@ struct cx231xx {
 	struct v4l2_subdev *sd_cx25840;
 	struct v4l2_subdev *sd_tuner;
 
-	struct cx231xx_IR *ir;
-
 	struct work_struct wq_trigger;		/* Trigger to start/stop audio for alsa module */
 	atomic_t	   stream_started;	/* stream should be running if true */
 
@@ -955,6 +972,17 @@ int cx231xx_tuner_callback(void *ptr, int component, int command, int arg);
 extern int cx231xx_417_register(struct cx231xx *dev);
 extern void cx231xx_417_unregister(struct cx231xx *dev);
 
+/* cx23885-input.c                                             */
+
+#if defined(CONFIG_VIDEO_CX231XX_RC)
+int cx231xx_ir_init(struct cx231xx *dev);
+void cx231xx_ir_exit(struct cx231xx *dev);
+#else
+#define cx231xx_ir_init(dev)	(0)
+#define cx231xx_ir_exit(dev)	(0)
+#endif
+
+
 /* printk macros */
 
 #define cx231xx_err(fmt, arg...) do {\