Date:	Sat, 28 Jan 2012 22:38:02 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	ondra.havel@...il.com
Cc:	oliver@...kum.org, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH v2] input: Hanvon Art Master I and Rollick tablet support
 (USB)

Hi Ondra,

On Mon, Jan 23, 2012 at 02:22:07AM +0100, ondra.havel@...il.com wrote:
> This driver supports multiple Hanvon tablets (USB).
> They are:
> 
> Artmaster I: AM0806, AM1107, AM1209
> Rollick: RL0604
> 
> Updated upon Oliver Neukum's review. Thanks a lot.
> 
> 
> Signed-off-by: Ondra Havel <ondra.havel@...il.com>

[dtor@...mer work]$ ./scripts/checkpatch.pl hanvon.patch
...

total: 39 errors, 19 warnings, 287 lines checked

hanvon.patch has style problems, please review.

If any of these errors are false positives, please report
them to the maintainer, see CHECKPATCH in MAINTAINERS.

Also:

> ---
> 
> 
>  drivers/input/tablet/Kconfig  |   11 ++
>  drivers/input/tablet/Makefile |    1
>  drivers/input/tablet/hanvon.c |  263 +++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 275 insertions(+), 0 deletions(-)
> 
> 
> 
> diff --git a/drivers/input/tablet/Kconfig b/drivers/input/tablet/Kconfig
> index 58a8775..25481e9 100644
> --- a/drivers/input/tablet/Kconfig
> +++ b/drivers/input/tablet/Kconfig
> @@ -49,6 +49,17 @@ config TABLET_USB_GTCO
>            To compile this driver as a module, choose M here: the
>            module will be called gtco.
> 
> +config TABLET_USB_HANVON
> +	tristate "Hanvon Art Master I and Rollick tablet support (USB)"
> +	depends on USB_ARCH_HAS_HCD
> +	select USB
> +	help
> +	  Say Y here if you want to use the USB version of the Hanvon Art
> +	  Master I or Rollick tablets.
> +
> +	  To compile this driver as a module, choose M here: the
> +	  module will be called hanvon.
> +
>  config TABLET_USB_HANWANG
>  	tristate "Hanwang Art Master III tablet support (USB)"
>  	depends on USB_ARCH_HAS_HCD
> diff --git a/drivers/input/tablet/Makefile b/drivers/input/tablet/Makefile
> index 3f6c252..d159383 100644
> --- a/drivers/input/tablet/Makefile
> +++ b/drivers/input/tablet/Makefile
> @@ -8,6 +8,7 @@ wacom-objs	:= wacom_wac.o wacom_sys.o
>  obj-$(CONFIG_TABLET_USB_ACECAD)	+= acecad.o
>  obj-$(CONFIG_TABLET_USB_AIPTEK)	+= aiptek.o
>  obj-$(CONFIG_TABLET_USB_GTCO)	+= gtco.o
> +obj-$(CONFIG_TABLET_USB_HANVON) += hanvon.o
>  obj-$(CONFIG_TABLET_USB_HANWANG) += hanwang.o
>  obj-$(CONFIG_TABLET_USB_KBTAB)	+= kbtab.o
>  obj-$(CONFIG_TABLET_USB_WACOM)	+= wacom.o
> diff --git a/drivers/input/tablet/hanvon.c b/drivers/input/tablet/hanvon.c
> new file mode 100644
> index 0000000..2f34582
> --- /dev/null
> +++ b/drivers/input/tablet/hanvon.c
> @@ -0,0 +1,263 @@
> +#include <linux/kernel.h>
> +#include <linux/slab.h>
> +#include <linux/module.h>
> +#include <linux/init.h>

#include <linux/input.h>

Does it need gfp.h too?

> +#include <linux/usb/input.h>
> +
> +#define DRIVER_VERSION "0.4a"
> +#define DRIVER_AUTHOR "Ondra Havel <ondra.havel@...il.com>"
> +#define DRIVER_DESC "USB Hanvon tablet driver"
> +#define DRIVER_LICENSE "GPL"
> +
> +MODULE_AUTHOR(DRIVER_AUTHOR);
> +MODULE_DESCRIPTION(DRIVER_DESC);
> +MODULE_LICENSE(DRIVER_LICENSE);
> +
> +#define USB_VENDOR_ID_HANVON	0x0b57
> +#define USB_PRODUCT_ID_AM0806	0x8502
> +#define USB_PRODUCT_ID_AM1107	0x8505
> +#define USB_PRODUCT_ID_AM1209	0x8501
> +#define USB_PRODUCT_ID_RL0604	0x851f
> +#define USB_AM_PACKET_LEN	10
> +
> +static int lbuttons[]={BTN_0,BTN_1,BTN_2,BTN_3};	/* reported on all AMs */
> +static int rbuttons[]={BTN_4,BTN_5,BTN_6,BTN_7};	/* reported on AM1107+ */
> +
> +#define AM_WHEEL_THRESHOLD	4
> +
> +#define AM_MAX_ABS_X	0x27de
> +#define AM_MAX_ABS_Y	0x1cfe
> +#define AM_MAX_TILT_X	0x3f
> +#define AM_MAX_TILT_Y	0x7f
> +#define AM_MAX_PRESSURE	0x400
> +
> +struct hanvon {
> +	unsigned char *data;
> +	dma_addr_t data_dma;
> +	struct mutex mutex;

Does not seem to be needed, open() and close() are already serialized.

> +	struct input_dev *dev;
> +	struct usb_device *usbdev;
> +	struct urb *irq;
> +	int old_wheel_pos;
> +	char phys[32];
> +};
> +
> +static void report_buttons(struct hanvon *hanvon, int buttons[],unsigned char dta)
> +{
> +	struct input_dev *dev = hanvon->dev;
> +
> +	if((dta & 0xf0) == 0xa0) {
> +		input_report_key(dev, buttons[1], dta & 0x02);
> +		input_report_key(dev, buttons[2], dta & 0x04);
> +		input_report_key(dev, buttons[3], dta & 0x08);
> +	} else {
> +		if(dta <= 0x3f) {	/* slider area active */

} else if () {
}

> +			int diff = dta - hanvon->old_wheel_pos;
> +			if(abs(diff) < AM_WHEEL_THRESHOLD)
> +				input_report_rel(dev, REL_WHEEL, diff);

Why less? I'd think you want changes above the threshold. Also, we have
ABS_WHEEL which seems to be what you need here.

> +
> +			hanvon->old_wheel_pos = dta;
> +		}
> +	}
> +}
> +
> +static void hanvon_irq(struct urb *urb)
> +{
> +	struct hanvon *hanvon = urb->context;
> +	unsigned char *data = hanvon->data;
> +	struct input_dev *dev = hanvon->dev;
> +	int ret;
> +
> +	switch (urb->status) {
> +		case 0:
> +			/* success */
> +			break;
> +		case -ECONNRESET:
> +		case -ENOENT:
> +		case -ESHUTDOWN:
> +			/* this urb is terminated, clean up */
> +			dbg("%s - urb shutting down with status: %d", __func__, urb->status);
> +			return;
> +		default:
> +			dbg("%s - nonzero urb status received: %d", __func__, urb->status);
> +			goto exit;
> +	}
> +
> +	switch(data[0]) {
> +		case 0x01:	/* button press */
> +			if(data[1]==0x55)	/* left side */
> +				report_buttons(hanvon,lbuttons,data[2]);
> +
> +			if(data[3]==0xaa)	/* right side (am1107, am1209) */
> +				report_buttons(hanvon,rbuttons,data[4]);
> +			break;
> +		case 0x02:	/* position change */
> +			if((data[1] & 0xf0) != 0) {
> +				input_report_abs(dev, ABS_X, be16_to_cpup((__be16 *)&data[2]));
> +				input_report_abs(dev, ABS_Y, be16_to_cpup((__be16 *)&data[4]));
> +				input_report_abs(dev, ABS_TILT_X, data[7] & 0x3f);
> +				input_report_abs(dev, ABS_TILT_Y, data[8]);
> +				input_report_abs(dev, ABS_PRESSURE, be16_to_cpup((__be16 *)&data[6])>>6);
> +			}
> +
> +		input_report_key(dev, BTN_LEFT, data[1] & 0x1);
> +		input_report_key(dev, BTN_RIGHT, data[1] & 0x2);		/* stylus button pressed (right click) */
> +		input_report_key(dev, lbuttons[0], data[1] & 0x20);
> +		break;
> +	}
> +
> +	input_sync(dev);
> +
> +exit:
> +	ret = usb_submit_urb (urb, GFP_ATOMIC);
> +	if (ret)
> +		err("%s - usb_submit_urb failed with result %d", __func__, ret);
> +}
> +
> +static struct usb_device_id hanvon_ids[] = {
> +	{ USB_DEVICE(USB_VENDOR_ID_HANVON, USB_PRODUCT_ID_AM1209) },
> +	{ USB_DEVICE(USB_VENDOR_ID_HANVON, USB_PRODUCT_ID_AM1107) },
> +	{ USB_DEVICE(USB_VENDOR_ID_HANVON, USB_PRODUCT_ID_AM0806) },
> +	{ USB_DEVICE(USB_VENDOR_ID_HANVON, USB_PRODUCT_ID_RL0604) },
> +	{ }
> +};
> +
> +MODULE_DEVICE_TABLE(usb, hanvon_ids);
> +
> +static int hanvon_open(struct input_dev *dev)
> +{
> +	int ret=0;
> +	struct hanvon *hanvon = input_get_drvdata(dev);
> +
> +	hanvon->old_wheel_pos = -AM_WHEEL_THRESHOLD-1;
> +	hanvon->irq->dev = hanvon->usbdev;
> +	mutex_lock(&hanvon->mutex);
> +	if(usb_submit_urb(hanvon->irq, GFP_KERNEL))
> +		ret = -EIO;
> +	mutex_unlock(&hanvon->mutex);
> +	return ret;
> +}
> +
> +static void hanvon_close(struct input_dev *dev)
> +{
> +	struct hanvon *hanvon = input_get_drvdata(dev);
> +
> +	mutex_lock(&hanvon->mutex);
> +	usb_kill_urb(hanvon->irq);
> +	mutex_unlock(&hanvon->mutex);
> +}
> +
> +static int hanvon_probe(struct usb_interface *intf, const struct usb_device_id *id)
> +{
> +	struct usb_device *dev = interface_to_usbdev(intf);
> +	struct usb_endpoint_descriptor *endpoint;
> +	struct hanvon *hanvon;
> +	struct input_dev *input_dev;
> +	int error = -ENOMEM, i;
> +
> +	hanvon = kzalloc(sizeof(struct hanvon), GFP_KERNEL);
> +	input_dev = input_allocate_device();
> +	if (!hanvon || !input_dev)
> +		goto fail1;
> +
> +	hanvon->data = (unsigned char *)usb_alloc_coherent(dev, USB_AM_PACKET_LEN, GFP_KERNEL, &hanvon->data_dma);

Why cast?

> +	if (!hanvon->data)
> +		goto fail1;
> +
> +	hanvon->irq = usb_alloc_urb(0, GFP_KERNEL);
> +	if (!hanvon->irq)
> +		goto fail2;
> +
> +	hanvon->usbdev = dev;
> +	hanvon->dev = input_dev;
> +
> +	usb_make_path(dev, hanvon->phys, sizeof(hanvon->phys));
> +	strlcat(hanvon->phys, "/input0", sizeof(hanvon->phys));
> +
> +	input_dev->name = "Hanvon Artmaster I tablet";
> +	input_dev->phys = hanvon->phys;
> +	usb_to_input_id(dev, &input_dev->id);
> +	input_dev->dev.parent = &intf->dev;
> +
> +	input_set_drvdata(input_dev, hanvon);
> +
> +	input_dev->open = hanvon_open;
> +	input_dev->close = hanvon_close;
> +
> +	input_dev->evbit[0] |= BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) | BIT_MASK(EV_REL);
> +	input_dev->keybit[BIT_WORD(BTN_DIGI)] |= BIT_MASK(BTN_TOOL_PEN) | BIT_MASK(BTN_TOUCH);
> +	input_dev->keybit[BIT_WORD(BTN_LEFT)] |= BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_RIGHT);

Maybe use __set_bit() or input_set_capability() here as well?

> +	for(i=0;i<sizeof(lbuttons)/sizeof(lbuttons[0]);i++)
> +		__set_bit(lbuttons[i], input_dev->keybit);
> +	for(i=0;i<sizeof(rbuttons)/sizeof(rbuttons[0]);i++)
> +		__set_bit(rbuttons[i], input_dev->keybit);
> +
> +	input_set_abs_params(input_dev, ABS_X, 0, AM_MAX_ABS_X, 4, 0);
> +	input_set_abs_params(input_dev, ABS_Y, 0, AM_MAX_ABS_Y, 4, 0);
> +	input_set_abs_params(input_dev, ABS_TILT_X, 0, AM_MAX_TILT_X, 0, 0);
> +	input_set_abs_params(input_dev, ABS_TILT_Y, 0, AM_MAX_TILT_Y, 0, 0);
> +	input_set_abs_params(input_dev, ABS_PRESSURE, 0, AM_MAX_PRESSURE, 0, 0);
> +	input_set_capability(input_dev, EV_REL, REL_WHEEL);
> +
> +	endpoint = &intf->cur_altsetting->endpoint[0].desc;
> +
> +	usb_fill_int_urb(hanvon->irq, dev,
> +			 usb_rcvintpipe(dev, endpoint->bEndpointAddress),
> +			 hanvon->data, USB_AM_PACKET_LEN,
> +			 hanvon_irq, hanvon, endpoint->bInterval);
> +	hanvon->irq->transfer_dma = hanvon->data_dma;
> +	hanvon->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
> +
> +	error = input_register_device(hanvon->dev);
> +	if (error)
> +		goto fail3;
> +
> +	usb_set_intfdata(intf, hanvon);
> +	mutex_init(&hanvon->mutex);

If this mutex was needed this place is tool late to initialize it as
open() and close() can get called the moment you initialize input
device.

> +	return 0;
> +
> +fail3:	usb_free_urb(hanvon->irq);
> +fail2:	usb_free_coherent(dev, USB_AM_PACKET_LEN, hanvon->data, hanvon->data_dma);
> +fail1:	input_free_device(input_dev);
> +	kfree(hanvon);
> +	return error;
> +}
> +
> +static void hanvon_disconnect(struct usb_interface *intf)
> +{
> +	struct hanvon *hanvon = usb_get_intfdata(intf);
> +
> +	usb_set_intfdata(intf, NULL);
> +	usb_kill_urb(hanvon->irq);

No need to do it here - close() will be called if needed.

> +	input_unregister_device(hanvon->dev);
> +	usb_free_urb(hanvon->irq);
> +	usb_free_coherent(interface_to_usbdev(intf), USB_AM_PACKET_LEN, hanvon->data, hanvon->data_dma);
> +	kfree(hanvon);
> +}
> +
> +static struct usb_driver hanvon_driver = {
> +	.name =	"hanvon",
> +	.probe = hanvon_probe,
> +	.disconnect = hanvon_disconnect,
> +	.id_table = hanvon_ids,
> +};
> +
> +static int __init hanvon_init(void)
> +{
> +	int ret;
> +
> +	if((ret = usb_register(&hanvon_driver)) != 0)
> +		return ret;

Just say:

	return usb_register(&hanvon_driver);

> +
> +	printk(DRIVER_DESC " " DRIVER_VERSION "\n");
> +
> +	return 0;
> +}
> +
> +static void __exit hanvon_exit(void)
> +{
> +	usb_deregister(&hanvon_driver);
> +}
> +
> +module_init(hanvon_init);
> +module_exit(hanvon_exit);

Thanks.

-- 
Dmitry
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