Commit 2fcfd317 authored by Mauro Carvalho Chehab's avatar Mauro Carvalho Chehab
Browse files

[media] au0828: add support for IR on HVR-950Q 



HVR-950Q uses an I2C remote controller at address 0x47 (7-bits
notation). Add support for it.

Signed-off-by: default avatarMauro Carvalho Chehab <m.chehab@samsung.com>
parent 32570579

drivers/media/usb/au0828/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -27,3 +27,10 @@ config VIDEO_AU0828_V4L2 


	  Choose Y here to include support for v4l2 analog video

	  capture within the au0828 driver.



config VIDEO_AU0828_RC

	bool "AU0828 Remote Controller support"

	depends on RC_CORE

	depends on VIDEO_AU0828

	---help---

	   Enables Remote Controller support on au0828 driver.

drivers/media/usb/au0828/Makefile

+4 −0
Original line number Diff line number Diff line
@@ -4,6 +4,10 @@ ifeq ($(CONFIG_VIDEO_AU0828_V4L2),y) 
  au0828-objs   += au0828-video.o au0828-vbi.o

endif



ifeq ($(CONFIG_VIDEO_AU0828_RC),y)

  au0828-objs   += au0828-input.o

endif



obj-$(CONFIG_VIDEO_AU0828) += au0828.o



ccflags-y += -Idrivers/media/tuners

drivers/media/usb/au0828/au0828-cards.c

+1 −0
Original line number Diff line number Diff line
@@ -71,6 +71,7 @@ struct au0828_board au0828_boards[] = { 
		.name	= "Hauppauge HVR950Q",

		.tuner_type = TUNER_XC5000,

		.tuner_addr = 0x61,

		.has_ir_i2c = 1,

		/* The au0828 hardware i2c implementation does not properly

		   support the xc5000's i2c clock stretching.  So we need to

		   lower the clock frequency enough where the 15us clock

drivers/media/usb/au0828/au0828-core.c

+21 −4
Original line number Diff line number Diff line
@@ -32,10 +32,12 @@ 
 * 2 = USB handling

 * 4 = I2C related

 * 8 = Bridge related

 * 16 = IR related

 */

int au0828_debug;

module_param_named(debug, au0828_debug, int, 0644);

MODULE_PARM_DESC(debug, "enable debug messages");

MODULE_PARM_DESC(debug,

		 "set debug bitmask: 1=general, 2=USB, 4=I2C, 8=bridge, 16=IR");



static unsigned int disable_usb_speed_check;

module_param(disable_usb_speed_check, int, 0444);
@@ -151,6 +153,9 @@ static void au0828_usb_disconnect(struct usb_interface *interface) 


	dprintk(1, "%s()\n", __func__);



#ifdef CONFIG_VIDEO_AU0828_RC

	au0828_rc_unregister(dev);

#endif

	/* Digital TV */

	au0828_dvb_unregister(dev);
@@ -261,9 +266,15 @@ static int au0828_usb_probe(struct usb_interface *interface, 
		pr_err("%s() au0282_dev_register failed\n",

		       __func__);



#ifdef CONFIG_VIDEO_AU0828_RC

	/* Remote controller */

	au0828_rc_register(dev);

#endif



	/* Store the pointer to the au0828_dev so it can be accessed in

	   au0828_usb_disconnect */

	/*

	 * Store the pointer to the au0828_dev so it can be accessed in

	 * au0828_usb_disconnect

	 */

	usb_set_intfdata(interface, dev);



	printk(KERN_INFO "Registered device AU0828 [%s]\n",
@@ -279,6 +290,8 @@ static struct usb_driver au0828_usb_driver = { 
	.probe		= au0828_usb_probe,

	.disconnect	= au0828_usb_disconnect,

	.id_table	= au0828_usb_id_table,



	/* FIXME: Add suspend and resume functions */

};



static int __init au0828_init(void)
@@ -298,6 +311,10 @@ static int __init au0828_init(void) 
		printk(KERN_INFO "%s() Bridge Debugging is enabled\n",

		       __func__);



	if (au0828_debug & 16)

		printk(KERN_INFO "%s() IR Debugging is enabled\n",

		       __func__);



	printk(KERN_INFO "au0828 driver loaded\n");



	ret = usb_register(&au0828_usb_driver);
@@ -318,4 +335,4 @@ module_exit(au0828_exit); 
MODULE_DESCRIPTION("Driver for Auvitek AU0828 based products");

MODULE_AUTHOR("Steven Toth <stoth@linuxtv.org>");

MODULE_LICENSE("GPL");

MODULE_VERSION("0.0.2");
 
MODULE_VERSION("0.0.3");

drivers/media/usb/au0828/au0828-input.c

0 → 100644
+386 −0
Original line number Diff line number Diff line 
/*

  handle au0828 IR remotes via linux kernel input layer.



   Copyright (C) 2014 Mauro Carvalho Chehab <mchehab@samsung.com>

   Copyright (c) 2014 Samsung Electronics Co., Ltd.



  Based on em28xx-input.c.



  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.

 */



#include <linux/module.h>

#include <linux/init.h>

#include <linux/delay.h>

#include <linux/interrupt.h>

#include <linux/usb.h>

#include <linux/slab.h>

#include <media/rc-core.h>



#include "au0828.h"



struct au0828_rc {

	struct au0828_dev *dev;

	struct rc_dev *rc;

	char name[32];

	char phys[32];



	/* poll decoder */

	int polling;

	struct delayed_work work;



	/* i2c slave address of external device (if used) */

	u16 i2c_dev_addr;



	int  (*get_key_i2c)(struct au0828_rc *ir);

};



/*

 * AU8522 has a builtin IR receiver. Add functions to get IR from it

 */



static int au8522_rc_write(struct au0828_rc *ir, u16 reg, u8 data)

{

	int rc;

	char buf[] = { (reg >> 8) | 0x80, reg & 0xff, data };

	struct i2c_msg msg = { .addr = ir->i2c_dev_addr, .flags = 0,

			       .buf = buf, .len = sizeof(buf) };



	rc = i2c_transfer(ir->dev->i2c_client.adapter, &msg, 1);



	if (rc < 0)

		return rc;



	return (rc == 1) ? 0 : -EIO;

}



static int au8522_rc_read(struct au0828_rc *ir, u16 reg, int val,

				 char *buf, int size)

{

	int rc;

	char obuf[3];

	struct i2c_msg msg[2] = { { .addr = ir->i2c_dev_addr, .flags = 0,

				    .buf = obuf, .len = 2 },

				  { .addr = ir->i2c_dev_addr, .flags = I2C_M_RD,

				    .buf = buf, .len = size } };



	obuf[0] = 0x40 | reg >> 8;

	obuf[1] = reg & 0xff;

	if (val >= 0) {

		obuf[2] = val;

		msg[0].len++;

	}



	rc = i2c_transfer(ir->dev->i2c_client.adapter, msg, 2);



	if (rc < 0)

		return rc;



	return (rc == 2) ? 0 : -EIO;

}



static int au8522_rc_andor(struct au0828_rc *ir, u16 reg, u8 mask, u8 value)

{

	int rc;

	char buf;



	rc = au8522_rc_read(ir, reg, -1, &buf, 1);

	if (rc < 0)

		return rc;



	buf = (buf & ~mask) | (value & mask);



	return au8522_rc_write(ir, reg, buf);

}



#define au8522_rc_set(ir, reg, bit) au8522_rc_andor(ir, (reg), (bit), (bit))

#define au8522_rc_clear(ir, reg, bit) au8522_rc_andor(ir, (reg), (bit), 0)



/* Remote Controller time units */



#define AU8522_UNIT		200000 /* ns */

#define NEC_START_SPACE		(4500000 / AU8522_UNIT)

#define NEC_START_PULSE		(562500 * 16)

#define RC5_START_SPACE		(4 * AU8522_UNIT)

#define RC5_START_PULSE		888888



static int au0828_get_key_au8522(struct au0828_rc *ir)

{

	unsigned char buf[40];

	DEFINE_IR_RAW_EVENT(rawir);

	int i, j, rc;

	int prv_bit, bit, width;

	bool first = true;



	/* Check IR int */

	rc = au8522_rc_read(ir, 0xe1, -1, buf, 1);

	if (rc < 0 || !(buf[0] & (1 << 4)))

		return 0;



	/* Something arrived. Get the data */

	rc = au8522_rc_read(ir, 0xe3, 0x11, buf, sizeof(buf));





	if (rc < 0)

		return rc;



	/* Disable IR */

	au8522_rc_clear(ir, 0xe0, 1 << 4);



	usleep_range(45000, 46000);



	/* Enable IR */

	au8522_rc_set(ir, 0xe0, 1 << 4);



	dprintk(16, "RC data received: %*ph\n", 40, buf);



	prv_bit = (buf[0] >> 7) & 0x01;

	width = 0;

	for (i = 0; i < sizeof(buf); i++) {

		for (j = 7; j >= 0; j--) {

			bit = (buf[i] >> j) & 0x01;

			if (bit == prv_bit) {

				width++;

				continue;

			}



			/*

			 * Fix an au8522 bug: the first pulse event

			 * is lost. So, we need to fake it, based on the

			 * protocol. That means that not all raw decoders

			 * will work, as we need to add a hack for each

			 * protocol, based on the first space.

			 * So, we only support RC5 and NEC.

			 */



			if (first) {

				first = false;



				init_ir_raw_event(&rawir);

				rawir.pulse = true;

				if (width > NEC_START_SPACE - 2 &&

				    width < NEC_START_SPACE + 2) {

					/* NEC protocol */

					rawir.duration = NEC_START_PULSE;

					dprintk(16, "Storing NEC start %s with duration %d",

						rawir.pulse ? "pulse" : "space",

						rawir.duration);

				} else {

					/* RC5 protocol */

					rawir.duration = RC5_START_PULSE;

					dprintk(16, "Storing RC5 start %s with duration %d",

						rawir.pulse ? "pulse" : "space",

						rawir.duration);

				}

				ir_raw_event_store(ir->rc, &rawir);

			}



			init_ir_raw_event(&rawir);

			rawir.pulse = prv_bit ? false : true;

			rawir.duration = AU8522_UNIT * width;

			dprintk(16, "Storing %s with duration %d",

				rawir.pulse ? "pulse" : "space",

				rawir.duration);

			ir_raw_event_store(ir->rc, &rawir);



			width = 1;

			prv_bit = bit;

		}

	}



	init_ir_raw_event(&rawir);

	rawir.pulse = prv_bit ? false : true;

	rawir.duration = AU8522_UNIT * width;

	dprintk(16, "Storing end %s with duration %d",

		rawir.pulse ? "pulse" : "space",

		rawir.duration);

	ir_raw_event_store(ir->rc, &rawir);



	ir_raw_event_handle(ir->rc);



	return 1;

}



/*

 * Generic IR code

 */



static void au0828_rc_work(struct work_struct *work)

{

	struct au0828_rc *ir = container_of(work, struct au0828_rc, work.work);

	int rc;



	rc = ir->get_key_i2c(ir);

	if (rc < 0)

		pr_info("Error while getting RC scancode\n");



	schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling));

}



static int au0828_rc_start(struct rc_dev *rc)

{

	struct au0828_rc *ir = rc->priv;



	INIT_DELAYED_WORK(&ir->work, au0828_rc_work);



	/* Enable IR */

	au8522_rc_set(ir, 0xe0, 1 << 4);



	schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling));



	return 0;

}



static void au0828_rc_stop(struct rc_dev *rc)

{

	struct au0828_rc *ir = rc->priv;



	/* Disable IR */

	au8522_rc_clear(ir, 0xe0, 1 << 4);



	cancel_delayed_work_sync(&ir->work);

}



static int au0828_probe_i2c_ir(struct au0828_dev *dev)

{

	int i = 0;

	const unsigned short addr_list[] = {

		 0x47, I2C_CLIENT_END

	};



	while (addr_list[i] != I2C_CLIENT_END) {

		if (i2c_probe_func_quick_read(dev->i2c_client.adapter,

					      addr_list[i]) == 1)

			return addr_list[i];

		i++;

	}



	return -ENODEV;

}



int au0828_rc_register(struct au0828_dev *dev)

{

	struct au0828_rc *ir;

	struct rc_dev *rc;

	int err = -ENOMEM;

	u16 i2c_rc_dev_addr = 0;



	if (!dev->board.has_ir_i2c)

		return 0;



	i2c_rc_dev_addr = au0828_probe_i2c_ir(dev);

	if (!i2c_rc_dev_addr)

		return -ENODEV;



	ir = kzalloc(sizeof(*ir), GFP_KERNEL);

	rc = rc_allocate_device();

	if (!ir || !rc)

		goto error;



	/* record handles to ourself */

	ir->dev = dev;

	dev->ir = ir;

	ir->rc = rc;



	rc->priv = ir;

	rc->open = au0828_rc_start;

	rc->close = au0828_rc_stop;



	if (dev->board.has_ir_i2c) {	/* external i2c device */

		switch (dev->boardnr) {

		case AU0828_BOARD_HAUPPAUGE_HVR950Q:

			rc->map_name = RC_MAP_HAUPPAUGE;

			ir->get_key_i2c = au0828_get_key_au8522;

			break;

		default:

			err = -ENODEV;

			goto error;

		}



		ir->i2c_dev_addr = i2c_rc_dev_addr;

	}



	/* This is how often we ask the chip for IR information */

	ir->polling = 100; /* ms */



	/* init input device */

	snprintf(ir->name, sizeof(ir->name), "au0828 IR (%s)",

		 dev->board.name);



	usb_make_path(dev->usbdev, ir->phys, sizeof(ir->phys));

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



	rc->input_name = ir->name;

	rc->input_phys = ir->phys;

	rc->input_id.bustype = BUS_USB;

	rc->input_id.version = 1;

	rc->input_id.vendor = le16_to_cpu(dev->usbdev->descriptor.idVendor);

	rc->input_id.product = le16_to_cpu(dev->usbdev->descriptor.idProduct);

	rc->dev.parent = &dev->usbdev->dev;

	rc->driver_name = "au0828-input";

	rc->driver_type = RC_DRIVER_IR_RAW;

	rc->allowed_protocols = RC_BIT_NEC | RC_BIT_RC5;



	/* all done */

	err = rc_register_device(rc);

	if (err)

		goto error;



	pr_info("Remote controller %s initalized\n", ir->name);



	return 0;



error:

	dev->ir = NULL;

	rc_free_device(rc);

	kfree(ir);

	return err;

}



void au0828_rc_unregister(struct au0828_dev *dev)

{

	struct au0828_rc *ir = dev->ir;



	/* skip detach on non attached boards */

	if (!ir)

		return;



	if (ir->rc)

		rc_unregister_device(ir->rc);



	/* done */

	kfree(ir);

	dev->ir = NULL;

}



int au0828_rc_suspend(struct au0828_dev *dev)

{

	struct au0828_rc *ir = dev->ir;



	if (!ir)

		return 0;



	cancel_delayed_work_sync(&ir->work);



	return 0;

}



int au0828_rc_resume(struct au0828_dev *dev)

{

	struct au0828_rc *ir = dev->ir;



	if (!ir)

		return 0;



	schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling));



	return 0;

}

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