drivers/media/video/cx231xx/cx231xx-input.c - kernel/windcharger - Git at Google

 /*
   handle cx231xx IR remotes via linux kernel input layer.

   Copyright (C) 2008 <srinivasa.deevi at conexant dot com>
 		Based on em28xx driver

 		< This is a place holder for IR now.>

   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; either version 2 of the License, or
   (at your option) any later version.

   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.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  */

 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/delay.h>
 #include <linux/interrupt.h>
 #include <linux/input.h>
 #include <linux/usb.h>

 #include "cx231xx.h"

 static unsigned int ir_debug;
 module_param(ir_debug, int, 0644);
 MODULE_PARM_DESC(ir_debug, "enable debug messages [IR]");

 #define i2cdprintk(fmt, arg...) \
 	if (ir_debug) { \
 		printk(KERN_DEBUG "%s/ir: " fmt, ir->name , ## arg); \
 	}

 #define dprintk(fmt, arg...) \
 	if (ir_debug) { \
 		printk(KERN_DEBUG "%s/ir: " fmt, ir->name , ## arg); \
 	}

 /**********************************************************
  Polling structure used by cx231xx IR's
  **********************************************************/

 struct cx231xx_ir_poll_result {
 	unsigned int toggle_bit:1;
 	unsigned int read_count:7;
 	u8 rc_address;
 	u8 rc_data[4];
 };

 struct cx231xx_IR {
 	struct cx231xx *dev;
 	struct input_dev *input;
 	struct ir_input_state ir;
 	char name[32];
 	char phys[32];

 	/* poll external decoder */
 	int polling;
 	struct work_struct work;
 	struct timer_list timer;
 	unsigned int last_toggle:1;
 	unsigned int last_readcount;
 	unsigned int repeat_interval;

 	int (*get_key) (struct cx231xx_IR *, struct cx231xx_ir_poll_result *);
 };

 /**********************************************************
  Polling code for cx231xx
  **********************************************************/

 static void cx231xx_ir_handle_key(struct cx231xx_IR *ir)
 {
 	int result;
 	int do_sendkey = 0;
 	struct cx231xx_ir_poll_result poll_result;

 	/* read the registers containing the IR status */
 	result = ir->get_key(ir, &poll_result);
 	if (result < 0) {
 		dprintk("ir->get_key() failed %d\n", result);
 		return;
 	}

 	dprintk("ir->get_key result tb=%02x rc=%02x lr=%02x data=%02x\n",
 		poll_result.toggle_bit, poll_result.read_count,
 		ir->last_readcount, poll_result.rc_data[0]);

 	if (ir->dev->chip_id == CHIP_ID_EM2874) {
 		/* The em2874 clears the readcount field every time the
 		   register is read.  The em2860/2880 datasheet says that it
 		   is supposed to clear the readcount, but it doesn't.  So with
 		   the em2874, we are looking for a non-zero read count as
 		   opposed to a readcount that is incrementing */
 		ir->last_readcount = 0;
 	}

 	if (poll_result.read_count == 0) {
 		/* The button has not been pressed since the last read */
 	} else if (ir->last_toggle != poll_result.toggle_bit) {
 		/* A button has been pressed */
 		dprintk("button has been pressed\n");
 		ir->last_toggle = poll_result.toggle_bit;
 		ir->repeat_interval = 0;
 		do_sendkey = 1;
 	} else if (poll_result.toggle_bit == ir->last_toggle &&
 		   poll_result.read_count > 0 &&
 		   poll_result.read_count != ir->last_readcount) {
 		/* The button is still being held down */
 		dprintk("button being held down\n");

 		/* Debouncer for first keypress */
 		if (ir->repeat_interval++ > 9) {
 			/* Start repeating after 1 second */
 			do_sendkey = 1;
 		}
 	}

 	if (do_sendkey) {
 		dprintk("sending keypress\n");
 		ir_input_keydown(ir->input, &ir->ir, poll_result.rc_data[0],
 				 poll_result.rc_data[0]);
 		ir_input_nokey(ir->input, &ir->ir);
 	}

 	ir->last_readcount = poll_result.read_count;
 	return;
 }

 static void ir_timer(unsigned long data)
 {
 	struct cx231xx_IR *ir = (struct cx231xx_IR *)data;

 	schedule_work(&ir->work);
 }

 static void cx231xx_ir_work(struct work_struct *work)
 {
 	struct cx231xx_IR *ir = container_of(work, struct cx231xx_IR, work);

 	cx231xx_ir_handle_key(ir);
 	mod_timer(&ir->timer, jiffies + msecs_to_jiffies(ir->polling));
 }

 void cx231xx_ir_start(struct cx231xx_IR *ir)
 {
 	setup_timer(&ir->timer, ir_timer, (unsigned long)ir);
 	INIT_WORK(&ir->work, cx231xx_ir_work);
 	schedule_work(&ir->work);
 }

 static void cx231xx_ir_stop(struct cx231xx_IR *ir)
 {
 	del_timer_sync(&ir->timer);
 	flush_scheduled_work();
 }

 int cx231xx_ir_init(struct cx231xx *dev)
 {
 	struct cx231xx_IR *ir;
 	struct input_dev *input_dev;
 	u8 ir_config;
 	int err = -ENOMEM;

 	if (dev->board.ir_codes == NULL) {
 		/* No remote control support */
 		return 0;
 	}

 	ir = kzalloc(sizeof(*ir), GFP_KERNEL);
 	input_dev = input_allocate_device();
 	if (!ir || !input_dev)
 		goto err_out_free;

 	ir->input = input_dev;

 	/* Setup the proper handler based on the chip */
 	switch (dev->chip_id) {
 	default:
 		printk("Unrecognized cx231xx chip id: IR not supported\n");
 		goto err_out_free;
 	}

 	/* This is how often we ask the chip for IR information */
 	ir->polling = 100;	/* ms */

 	/* init input device */
 	snprintf(ir->name, sizeof(ir->name), "cx231xx IR (%s)", dev->name);

 	usb_make_path(dev->udev, ir->phys, sizeof(ir->phys));
 	strlcat(ir->phys, "/input0", sizeof(ir->phys));

 	ir_input_init(input_dev, &ir->ir, IR_TYPE_OTHER, dev->board.ir_codes);
 	input_dev->name = ir->name;
 	input_dev->phys = ir->phys;
 	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);

 	input_dev->dev.parent = &dev->udev->dev;
 	/* record handles to ourself */
 	ir->dev = dev;
 	dev->ir = ir;

 	cx231xx_ir_start(ir);

 	/* all done */
 	err = input_register_device(ir->input);
 	if (err)
 		goto err_out_stop;

 	return 0;
 err_out_stop:
 	cx231xx_ir_stop(ir);
 	dev->ir = NULL;
 err_out_free:
 	input_free_device(input_dev);
 	kfree(ir);
 	return err;
 }

 int cx231xx_ir_fini(struct cx231xx *dev)
 {
 	struct cx231xx_IR *ir = dev->ir;

 	/* skip detach on non attached boards */
 	if (!ir)
 		return 0;

 	cx231xx_ir_stop(ir);
 	input_unregister_device(ir->input);
 	kfree(ir);

 	/* done */
 	dev->ir = NULL;
 	return 0;
 }
	/*
	handle cx231xx IR remotes via linux kernel input layer.

	Copyright (C) 2008 <srinivasa.deevi at conexant dot com>
	Based on em28xx driver

	< This is a place holder for IR now.>

	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; either version 2 of the License, or
	(at your option) any later version.

	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.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to the Free Software
	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*/

	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/delay.h>
	#include <linux/interrupt.h>
	#include <linux/input.h>
	#include <linux/usb.h>

	#include "cx231xx.h"

	static unsigned int ir_debug;
	module_param(ir_debug, int, 0644);
	MODULE_PARM_DESC(ir_debug, "enable debug messages [IR]");

	#define i2cdprintk(fmt, arg...) \
	if (ir_debug) { \
	printk(KERN_DEBUG "%s/ir: " fmt, ir->name , ## arg); \
	}

	#define dprintk(fmt, arg...) \
	if (ir_debug) { \
	printk(KERN_DEBUG "%s/ir: " fmt, ir->name , ## arg); \
	}

	/**********************************************************
	Polling structure used by cx231xx IR's
	**********************************************************/

	struct cx231xx_ir_poll_result {
	unsigned int toggle_bit:1;
	unsigned int read_count:7;
	u8 rc_address;
	u8 rc_data[4];
	};

	struct cx231xx_IR {
	struct cx231xx *dev;
	struct input_dev *input;
	struct ir_input_state ir;
	char name[32];
	char phys[32];

	/* poll external decoder */
	int polling;
	struct work_struct work;
	struct timer_list timer;
	unsigned int last_toggle:1;
	unsigned int last_readcount;
	unsigned int repeat_interval;

	int (get_key) (struct cx231xx_IR , struct cx231xx_ir_poll_result *);
	};

	/**********************************************************
	Polling code for cx231xx
	**********************************************************/

	static void cx231xx_ir_handle_key(struct cx231xx_IR *ir)
	{
	int result;
	int do_sendkey = 0;
	struct cx231xx_ir_poll_result poll_result;

	/* read the registers containing the IR status */
	result = ir->get_key(ir, &poll_result);
	if (result < 0) {
	dprintk("ir->get_key() failed %d\n", result);
	return;
	}

	dprintk("ir->get_key result tb=%02x rc=%02x lr=%02x data=%02x\n",
	poll_result.toggle_bit, poll_result.read_count,
	ir->last_readcount, poll_result.rc_data[0]);

	if (ir->dev->chip_id == CHIP_ID_EM2874) {
	/* The em2874 clears the readcount field every time the
	register is read. The em2860/2880 datasheet says that it
	is supposed to clear the readcount, but it doesn't. So with
	the em2874, we are looking for a non-zero read count as
	opposed to a readcount that is incrementing */
	ir->last_readcount = 0;
	}

	if (poll_result.read_count == 0) {
	/* The button has not been pressed since the last read */
	} else if (ir->last_toggle != poll_result.toggle_bit) {
	/* A button has been pressed */
	dprintk("button has been pressed\n");
	ir->last_toggle = poll_result.toggle_bit;
	ir->repeat_interval = 0;
	do_sendkey = 1;
	} else if (poll_result.toggle_bit == ir->last_toggle &&
	poll_result.read_count > 0 &&
	poll_result.read_count != ir->last_readcount) {
	/* The button is still being held down */
	dprintk("button being held down\n");

	/* Debouncer for first keypress */
	if (ir->repeat_interval++ > 9) {
	/* Start repeating after 1 second */
	do_sendkey = 1;
	}
	}

	if (do_sendkey) {
	dprintk("sending keypress\n");
	ir_input_keydown(ir->input, &ir->ir, poll_result.rc_data[0],
	poll_result.rc_data[0]);
	ir_input_nokey(ir->input, &ir->ir);
	}

	ir->last_readcount = poll_result.read_count;
	return;
	}

	static void ir_timer(unsigned long data)
	{
	struct cx231xx_IR ir = (struct cx231xx_IR )data;

	schedule_work(&ir->work);
	}

	static void cx231xx_ir_work(struct work_struct *work)
	{
	struct cx231xx_IR *ir = container_of(work, struct cx231xx_IR, work);

	cx231xx_ir_handle_key(ir);
	mod_timer(&ir->timer, jiffies + msecs_to_jiffies(ir->polling));
	}

	void cx231xx_ir_start(struct cx231xx_IR *ir)
	{
	setup_timer(&ir->timer, ir_timer, (unsigned long)ir);
	INIT_WORK(&ir->work, cx231xx_ir_work);
	schedule_work(&ir->work);
	}

	static void cx231xx_ir_stop(struct cx231xx_IR *ir)
	{
	del_timer_sync(&ir->timer);
	flush_scheduled_work();
	}

	int cx231xx_ir_init(struct cx231xx *dev)
	{
	struct cx231xx_IR *ir;
	struct input_dev *input_dev;
	u8 ir_config;
	int err = -ENOMEM;

	if (dev->board.ir_codes == NULL) {
	/* No remote control support */
	return 0;
	}

	ir = kzalloc(sizeof(*ir), GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!ir \|\| !input_dev)
	goto err_out_free;

	ir->input = input_dev;

	/* Setup the proper handler based on the chip */
	switch (dev->chip_id) {
	default:
	printk("Unrecognized cx231xx chip id: IR not supported\n");
	goto err_out_free;
	}

	/* This is how often we ask the chip for IR information */
	ir->polling = 100; /* ms */

	/* init input device */
	snprintf(ir->name, sizeof(ir->name), "cx231xx IR (%s)", dev->name);

	usb_make_path(dev->udev, ir->phys, sizeof(ir->phys));
	strlcat(ir->phys, "/input0", sizeof(ir->phys));

	ir_input_init(input_dev, &ir->ir, IR_TYPE_OTHER, dev->board.ir_codes);
	input_dev->name = ir->name;
	input_dev->phys = ir->phys;
	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);

	input_dev->dev.parent = &dev->udev->dev;
	/* record handles to ourself */
	ir->dev = dev;
	dev->ir = ir;

	cx231xx_ir_start(ir);

	/* all done */
	err = input_register_device(ir->input);
	if (err)
	goto err_out_stop;

	return 0;
	err_out_stop:
	cx231xx_ir_stop(ir);
	dev->ir = NULL;
	err_out_free:
	input_free_device(input_dev);
	kfree(ir);
	return err;
	}

	int cx231xx_ir_fini(struct cx231xx *dev)
	{
	struct cx231xx_IR *ir = dev->ir;

	/* skip detach on non attached boards */
	if (!ir)
	return 0;

	cx231xx_ir_stop(ir);
	input_unregister_device(ir->input);
	kfree(ir);

	/* done */
	dev->ir = NULL;
	return 0;
	}