[RFC,1/2] gspca: add input support for interrupt endpoints

  From: Márton Németh <nm127@freemail.hu>

Add helper functions for interrupt endpoint based input handling.

Signed-off-by: Márton Németh <nm127@freemail.hu>
---
Hi,

maybe a new configuration option should be also introduced?

Regards,

	Márton Németh
---
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Hi Márton,

On 11/19/2009 08:46 AM, Németh Márton wrote:
> From: Márton Németh<nm127@freemail.hu>
>
> Add helper functions for interrupt endpoint based input handling.
>

First of all many many thanks for doing this!

> Signed-off-by: Márton Németh<nm127@freemail.hu>
> ---
> Hi,
>
> maybe a new configuration option should bealso introduced?

I'm personally not a big fan of adding more configuration options,
what should be done instead is make the compilation dependent on the
CONFIG_INPUT kernel config option, I see no reason not to enable this
when CONFIG_INPUT is enabled.

Some other remarks, you are using:
printk(KERN_DEBUG
In various places, please use
PDEBUG(D_FOO
instead so that the output can be controlled using the gspca module's
debug parameter.

And in gspca_input_connect() you are setting name to "pac7302", this
needs to be generalized somehow, and also you are not setting the
input device's parent there, I think we need to fix that too
(although I'm not sure what it should be set to).

Other then that this looks good, I cannot wait till it is merged,
then I can start adding support for the button of all 30+ webcams
I have over here :)

Regards,

Hans


>
> Regards,
>
> 	Márton Németh
> ---
> diff -r 182b5f8fa160 linux/drivers/media/video/gspca/Makefile
> --- a/linux/drivers/media/video/gspca/Makefile	Sun Nov 15 10:05:30 2009 +0100
> +++ b/linux/drivers/media/video/gspca/Makefile	Thu Nov 19 08:42:12 2009 +0100
> @@ -1,4 +1,5 @@
>   obj-$(CONFIG_USB_GSPCA)          += gspca_main.o
> +obj-$(CONFIG_USB_GSPCA)          += gspca_input.o
>   obj-$(CONFIG_USB_GSPCA_CONEX)    += gspca_conex.o
>   obj-$(CONFIG_USB_GSPCA_ETOMS)    += gspca_etoms.o
>   obj-$(CONFIG_USB_GSPCA_FINEPIX)  += gspca_finepix.o
> @@ -30,6 +31,7 @@
>   obj-$(CONFIG_USB_GSPCA_ZC3XX)    += gspca_zc3xx.o
>
>   gspca_main-objs     := gspca.o
> +gspca_input-objs    := input.o
>   gspca_conex-objs    := conex.o
>   gspca_etoms-objs    := etoms.o
>   gspca_finepix-objs  := finepix.o
> diff -r 182b5f8fa160 linux/drivers/media/video/gspca/gspca.c
> --- a/linux/drivers/media/video/gspca/gspca.c	Sun Nov 15 10:05:30 2009 +0100
> +++ b/linux/drivers/media/video/gspca/gspca.c	Thu Nov 19 08:42:12 2009 +0100
> @@ -40,6 +40,9 @@
>   #include<media/v4l2-ioctl.h>
>
>   #include "gspca.h"
> +
> +#include<linux/input.h>
> +#include "input.h"
>
>   /* global values */
>   #define DEF_NURBS 3		/* default number of URBs */
> @@ -499,11 +502,13 @@
>   			i, ep->desc.bEndpointAddress);
>   	gspca_dev->alt = i;		/* memorize the current alt setting */
>   	if (gspca_dev->nbalt>  1) {
> +		gspca_input_destroy_urb(gspca_dev);
>   		ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
>   		if (ret<  0) {
>   			err("set alt %d err %d", i, ret);
> -			return NULL;
> +			ep = NULL;
>   		}
> +		gspca_input_create_urb(gspca_dev);
>   	}
>   	return ep;
>   }
> @@ -707,7 +712,9 @@
>   		if (gspca_dev->sd_desc->stopN)
>   			gspca_dev->sd_desc->stopN(gspca_dev);
>   		destroy_urbs(gspca_dev);
> +		gspca_input_destroy_urb(gspca_dev);
>   		gspca_set_alt0(gspca_dev);
> +		gspca_input_create_urb(gspca_dev);
>   	}
>
>   	/* always call stop0 to free the subdriver's resources */
> @@ -2088,6 +2095,11 @@
>
>   	usb_set_intfdata(intf, gspca_dev);
>   	PDEBUG(D_PROBE, "/dev/video%d created", gspca_dev->vdev.num);
> +
> +	ret = gspca_input_connect(gspca_dev, id);
> +	if (0<= ret)
> +		ret = gspca_input_create_urb(gspca_dev);
> +
>   	return 0;
>   out:
>   	kfree(gspca_dev->usb_buf);
> @@ -2105,6 +2117,7 @@
>   void gspca_disconnect(struct usb_interface *intf)
>   {
>   	struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
> +	struct input_dev *input_dev;
>
>   	PDEBUG(D_PROBE, "/dev/video%d disconnect", gspca_dev->vdev.num);
>   	mutex_lock(&gspca_dev->usb_lock);
> @@ -2113,6 +2126,13 @@
>   	if (gspca_dev->streaming) {
>   		destroy_urbs(gspca_dev);
>   		wake_up_interruptible(&gspca_dev->wq);
> +	}
> +
> +	gspca_input_destroy_urb(gspca_dev);
> +	input_dev = gspca_dev->input_dev;
> +	if (input_dev) {
> +		gspca_dev->input_dev = NULL;
> +		input_unregister_device(input_dev);
>   	}
>
>   	/* the device is freed at exit of this function */
> @@ -2140,6 +2160,7 @@
>   	if (gspca_dev->sd_desc->stopN)
>   		gspca_dev->sd_desc->stopN(gspca_dev);
>   	destroy_urbs(gspca_dev);
> +	gspca_input_destroy_urb(gspca_dev);
>   	gspca_set_alt0(gspca_dev);
>   	if (gspca_dev->sd_desc->stop0)
>   		gspca_dev->sd_desc->stop0(gspca_dev);
> @@ -2153,6 +2174,7 @@
>
>   	gspca_dev->frozen = 0;
>   	gspca_dev->sd_desc->init(gspca_dev);
> +	gspca_input_create_urb(gspca_dev);
>   	if (gspca_dev->streaming)
>   		return gspca_init_transfer(gspca_dev);
>   	return 0;
> diff -r 182b5f8fa160 linux/drivers/media/video/gspca/gspca.h
> --- a/linux/drivers/media/video/gspca/gspca.h	Sun Nov 15 10:05:30 2009 +0100
> +++ b/linux/drivers/media/video/gspca/gspca.h	Thu Nov 19 08:42:12 2009 +0100
> @@ -81,6 +81,9 @@
>   typedef void (*cam_pkt_op) (struct gspca_dev *gspca_dev,
>   				u8 *data,
>   				int len);
> +typedef int (*cam_int_pkt_op) (struct gspca_dev *gspca_dev,
> +				u8 *data,
> +				int len);
>
>   struct ctrl {
>   	struct v4l2_queryctrl qctrl;
> @@ -116,6 +119,7 @@
>   	cam_reg_op get_register;
>   #endif
>   	cam_ident_op get_chip_ident;
> +	cam_int_pkt_op int_pkt_scan;
>   };
>
>   /* packet types when moving from iso buf to frame buf */
> @@ -138,6 +142,7 @@
>   	struct module *module;		/* subdriver handling the device */
>   	struct usb_device *dev;
>   	struct file *capt_file;		/* file doing video capture */
> +	struct input_dev *input_dev;
>
>   	struct cam cam;				/* device information */
>   	const struct sd_desc *sd_desc;		/* subdriver description */
> @@ -147,6 +152,7 @@
>   #define USB_BUF_SZ 64
>   	__u8 *usb_buf;				/* buffer for USB exchanges */
>   	struct urb *urb[MAX_NURBS];
> +	struct urb *int_urb;
>
>   	__u8 *frbuf;				/* buffer for nframes */
>   	struct gspca_frame frame[GSPCA_MAX_FRAMES];
> diff -r 182b5f8fa160 linux/drivers/media/video/gspca/input.c
> --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
> +++ b/linux/drivers/media/video/gspca/input.c	Thu Nov 19 08:42:12 2009 +0100
> @@ -0,0 +1,193 @@
> +/*
> + * Input handling for gspca USB camera drivers
> + *
> + * Copyright (C) 2009 Márton Németh<nm127@freemail.hu>
> + *
> + * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
> + */
> +
> +#define MODULE_NAME "gspca_input"
> +
> +#include<linux/init.h>
> +#include<linux/module.h>
> +#include<linux/input.h>
> +
> +#include "gspca.h"
> +#include "input.h"
> +
> +MODULE_AUTHOR("Márton Németh<nm127@freemail.hu>");
> +MODULE_DESCRIPTION("GSPCA USB Camera Input Driver");
> +MODULE_LICENSE("GPL");
> +
> +#define DRIVER_VERSION_NUMBER	KERNEL_VERSION(0, 0, 1)
> +
> +#if LINUX_VERSION_CODE<  KERNEL_VERSION(2, 6, 19)
> +static void int_irq(struct urb *urb, struct pt_regs *regs)
> +#else
> +static void int_irq(struct urb *urb)
> +#endif
> +{
> +	struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
> +	int ret;
> +	int i;
> +
> +	printk(KERN_DEBUG "int_irq()\n");
> +	printk(KERN_DEBUG "urb->status: %i\n", urb->status);
> +	if (urb->status == 0) {
> +		printk(KERN_DEBUG "urb->actual_length: %u\n", urb->actual_length);
> +		for (i = 0; i<  urb->actual_length; i++) {
> +			printk(KERN_DEBUG "urb->transfer_buffer[%i]=0x%x\n",
> +				i, ((u8*)urb->transfer_buffer)[i]);
> +		}
> +		if (gspca_dev->sd_desc->int_pkt_scan(gspca_dev,
> +		    urb->transfer_buffer, urb->actual_length)<  0) {
> +			printk(KERN_DEBUG "Unknown packet received\n");
> +		}
> +
> +		ret = usb_submit_urb(urb, GFP_ATOMIC);
> +		printk(KERN_DEBUG "resubmit urb: %i\n", ret);
> +	}
> +
> +}
> +
> +int gspca_input_connect(struct gspca_dev *gspca_dev, const struct usb_device_id *id)
> +{
> +	struct input_dev *input_dev;
> +	int err = 0;
> +
> +	gspca_dev->input_dev = NULL;
> +	if (gspca_dev->sd_desc->int_pkt_scan)  {
> +		printk(KERN_DEBUG "allocating input device\n");
> +		input_dev = input_allocate_device();
> +		if (!input_dev)
> +			return -ENOMEM;
> +
> +		input_dev->name = "pac7302";
> +		//input_dev->phys = "camera";
> +		input_dev->id.bustype = BUS_USB;
> +		input_dev->id.vendor = le16_to_cpu(id->idVendor);
> +		input_dev->id.product = le16_to_cpu(id->idProduct);
> +		input_dev->id.version = le16_to_cpu(id->bcdDevice_hi);
> +		//input_dev->id.version = le16_to_cpu(id->bcdDevice_lo);
> +
> +		input_dev->evbit[0] = BIT_MASK(EV_KEY);
> +		input_dev->keybit[BIT_WORD(KEY_CAMERA)] = BIT_MASK(KEY_CAMERA);
> +		//input_dev->dev.parent = ;
> +
> +		printk(KERN_DEBUG "registering input device\n");
> +		err = input_register_device(input_dev);
> +		if (err) {
> +			printk(KERN_DEBUG "input device registration failed\n");
> +			input_dev->dev.parent = NULL;
> +			input_free_device(input_dev);
> +		} else {
> +			gspca_dev->input_dev = input_dev;
> +		}
> +	}
> +
> +	return err;
> +}
> +EXPORT_SYMBOL(gspca_input_connect);
> +
> +int gspca_input_create_urb(struct gspca_dev *gspca_dev)
> +{
> +	int ret = -EINVAL;
> +	struct usb_interface *intf;
> +	struct usb_host_interface *intf_desc;
> +	struct usb_endpoint_descriptor *ep;
> +	int i;
> +	struct urb *urb;
> +	void* buffer = NULL;
> +	unsigned int buffer_len;
> +	int interval;
> +	struct usb_device *dev;
> +
> +	if (gspca_dev->sd_desc->int_pkt_scan)  {
> +		intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
> +		intf_desc = intf->cur_altsetting;
> +		for (i = 0; i<  intf_desc->desc.bNumEndpoints; i++) {
> +			ep =&intf_desc->endpoint[i].desc;
> +			if ((ep->bEndpointAddress&  USB_DIR_IN)&&
> +			    ((ep->bmAttributes&  USB_ENDPOINT_XFERTYPE_MASK)
> +				== USB_ENDPOINT_XFER_INT)) {
> +
> +				buffer_len = ep->wMaxPacketSize;
> +				interval = ep->bInterval;
> +				printk(KERN_DEBUG "found int in endpoint: 0x%x\n", ep->bEndpointAddress);
> +				printk(KERN_DEBUG " - buffer_len = %u\n", buffer_len);
> +				printk(KERN_DEBUG " - interval = %u\n", interval);
> +
> +				dev = gspca_dev->dev;
> +				gspca_dev->int_urb = NULL;
> +
> +				buffer = kmalloc(ep->wMaxPacketSize, GFP_KERNEL);
> +				if (buffer)
> +					urb = usb_alloc_urb(0, GFP_KERNEL);
> +				else {
> +					printk(KERN_DEBUG "buffer allocation failed\n");
> +					kfree(buffer);
> +					urb = NULL;
> +				}
> +				if (buffer&&  urb) {
> +					usb_fill_int_urb(urb, dev,
> +						usb_rcvintpipe(dev, ep->bEndpointAddress),
> +						buffer, buffer_len,
> +						int_irq, (void*)gspca_dev, interval);
> +					gspca_dev->int_urb = urb;
> +					ret = usb_submit_urb(urb, GFP_KERNEL);
> +					printk(KERN_DEBUG "usb_submit_urb() returns %i\n", ret);
> +				} else
> +					printk(KERN_DEBUG "URB allocation failed\n");
> +
> +			}
> +
> +		}
> +	}
> +	return ret;
> +}
> +EXPORT_SYMBOL(gspca_input_create_urb);
> +
> +void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
> +{
> +	struct urb *urb;
> +
> +	urb = gspca_dev->int_urb;
> +	if (urb) {
> +		gspca_dev->int_urb = NULL;
> +		usb_kill_urb(urb);
> +		usb_buffer_free(gspca_dev->dev,
> +				urb->transfer_buffer_length,
> +				urb->transfer_buffer,
> +				urb->transfer_dma);
> +		usb_free_urb(urb);
> +	}
> +}
> +EXPORT_SYMBOL(gspca_input_destroy_urb);
> +
> +static int __init gspca_input_init(void)
> +{
> +	info("v%d.%d.%d registered",
> +		(DRIVER_VERSION_NUMBER>>  16)&  0xff,
> +		(DRIVER_VERSION_NUMBER>>  8)&  0xff,
> +		DRIVER_VERSION_NUMBER&  0xff);
> +	return 0;
> +}
> +static void __exit gspca_input_exit(void)
> +{
> +	info("deregistered");
> +}
> +
> +module_init(gspca_input_init);
> +module_exit(gspca_input_exit);
> diff -r 182b5f8fa160 linux/drivers/media/video/gspca/input.h
> --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
> +++ b/linux/drivers/media/video/gspca/input.h	Thu Nov 19 08:42:12 2009 +0100
> @@ -0,0 +1,30 @@
> +/*
> + * Input handling for gspca USB camera drivers
> + *
> + * Copyright (C) 2009 Márton Németh<nm127@freemail.hu>
> + *
> + * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
> + */
> +
> +#ifndef GSPCA_INPUT_H
> +#define GSPCA_INPUT_H
> +
> +#include "gspca.h"
> +
> +int gspca_input_connect(struct gspca_dev *gspca_dev, const struct usb_device_id *id);
> +int gspca_input_create_urb(struct gspca_dev *gspca_dev);
> +void gspca_input_destroy_urb(struct gspca_dev *gspca_dev);
> +
> +#endif
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