On Mon, Nov 30, 2015 at 01:38:15PM +1000, Peter Hutterer wrote:
> This is preparation work for splitting it up for two event nodes.
>
> The error handling for the touch init failure must be special-cased, a
> device may respond to a touch query with a zero reply. In this case we
> don't have a touch device, but we don't have a true failure either.
> Returning 1 as special value here so we can then restore the true error
> code on failure.
>
> Signed-off-by: Peter Hutterer <peter.hutte...@who-t.net>
> Acked-by: Benjamin Tissoires <benjamin.tissoi...@gmail.com>
> ---
> drivers/input/touchscreen/wacom_w8001.c | 198
> ++++++++++++++++++--------------
> 1 file changed, 112 insertions(+), 86 deletions(-)
>
> diff --git a/drivers/input/touchscreen/wacom_w8001.c
> b/drivers/input/touchscreen/wacom_w8001.c
> index cdebf8e..363e510 100644
> --- a/drivers/input/touchscreen/wacom_w8001.c
> +++ b/drivers/input/touchscreen/wacom_w8001.c
> @@ -380,12 +380,10 @@ static void w8001_close(struct input_dev *dev)
> w8001_command(w8001, W8001_CMD_STOP, false);
> }
>
> -static int w8001_setup(struct w8001 *w8001)
> +static int w8001_detect(struct w8001 *w8001)
> {
> struct input_dev *dev = w8001->dev;
> - struct w8001_coord coord;
> - struct w8001_touch_query touch;
> - int error, err_pen, err_touch;
> + int error;
>
> error = w8001_command(w8001, W8001_CMD_STOP, false);
> if (error)
> @@ -399,101 +397,122 @@ static int w8001_setup(struct w8001 *w8001)
>
> __set_bit(INPUT_PROP_DIRECT, dev->propbit);
>
> + return 0;
> +}
> +
> +static int w8001_setup_pen(struct w8001 *w8001)
> +{
> + struct input_dev *dev = w8001->dev;
> + struct w8001_coord coord;
> + int error;
> +
> /* penabled? */
> - err_pen = w8001_command(w8001, W8001_CMD_QUERY, true);
> - if (!err_pen) {
> - __set_bit(BTN_TOUCH, dev->keybit);
> - __set_bit(BTN_TOOL_PEN, dev->keybit);
> - __set_bit(BTN_TOOL_RUBBER, dev->keybit);
> - __set_bit(BTN_STYLUS, dev->keybit);
> - __set_bit(BTN_STYLUS2, dev->keybit);
> + error = w8001_command(w8001, W8001_CMD_QUERY, true);
> + if (error)
> + return error;
>
> - parse_pen_data(w8001->response, &coord);
> - w8001->max_pen_x = coord.x;
> - w8001->max_pen_y = coord.y;
> + __set_bit(BTN_TOUCH, dev->keybit);
> + __set_bit(BTN_TOOL_PEN, dev->keybit);
> + __set_bit(BTN_TOOL_RUBBER, dev->keybit);
> + __set_bit(BTN_STYLUS, dev->keybit);
> + __set_bit(BTN_STYLUS2, dev->keybit);
>
> - input_set_abs_params(dev, ABS_X, 0, coord.x, 0, 0);
> - input_set_abs_params(dev, ABS_Y, 0, coord.y, 0, 0);
> - input_abs_set_res(dev, ABS_X, W8001_PEN_RESOLUTION);
> - input_abs_set_res(dev, ABS_Y, W8001_PEN_RESOLUTION);
> - input_set_abs_params(dev, ABS_PRESSURE, 0, coord.pen_pressure,
> 0, 0);
> - if (coord.tilt_x && coord.tilt_y) {
> - input_set_abs_params(dev, ABS_TILT_X, 0, coord.tilt_x,
> 0, 0);
> - input_set_abs_params(dev, ABS_TILT_Y, 0, coord.tilt_y,
> 0, 0);
> - }
> - w8001->id = 0x90;
> - strlcat(w8001->name, " Penabled", sizeof(w8001->name));
> + parse_pen_data(w8001->response, &coord);
> + w8001->max_pen_x = coord.x;
> + w8001->max_pen_y = coord.y;
> +
> + input_set_abs_params(dev, ABS_X, 0, coord.x, 0, 0);
> + input_set_abs_params(dev, ABS_Y, 0, coord.y, 0, 0);
> + input_abs_set_res(dev, ABS_X, W8001_PEN_RESOLUTION);
> + input_abs_set_res(dev, ABS_Y, W8001_PEN_RESOLUTION);
> + input_set_abs_params(dev, ABS_PRESSURE, 0, coord.pen_pressure, 0, 0);
> + if (coord.tilt_x && coord.tilt_y) {
> + input_set_abs_params(dev, ABS_TILT_X, 0, coord.tilt_x, 0, 0);
> + input_set_abs_params(dev, ABS_TILT_Y, 0, coord.tilt_y, 0, 0);
> }
>
> + w8001->id = 0x90;
> + strlcat(w8001->name, " Penabled", sizeof(w8001->name));
> +
> + return 0;
> +}
> +
> +static int w8001_setup_touch(struct w8001 *w8001)
> +{
> + struct input_dev *dev = w8001->dev;
> + struct w8001_touch_query touch;
> + int error;
> +
> /* Touch enabled? */
> - err_touch = w8001_command(w8001, W8001_CMD_TOUCHQUERY, true);
> + error = w8001_command(w8001, W8001_CMD_TOUCHQUERY, true);
> + if (error)
> + return error;
>
> /*
> * Some non-touch devices may reply to the touch query. But their
> * second byte is empty, which indicates touch is not supported.
> */
> - if (!err_touch && w8001->response[1]) {
> - err_touch = 1;
> -
> - __set_bit(BTN_TOUCH, dev->keybit);
> - __set_bit(BTN_TOOL_FINGER, dev->keybit);
> -
> - parse_touchquery(w8001->response, &touch);
> - w8001->max_touch_x = touch.x;
> - w8001->max_touch_y = touch.y;
> -
> - if (w8001->max_pen_x && w8001->max_pen_y) {
> - /* if pen is supported scale to pen maximum */
> - touch.x = w8001->max_pen_x;
> - touch.y = w8001->max_pen_y;
> - touch.panel_res = W8001_PEN_RESOLUTION;
> - }
> -
> - input_set_abs_params(dev, ABS_X, 0, touch.x, 0, 0);
> - input_set_abs_params(dev, ABS_Y, 0, touch.y, 0, 0);
> - input_abs_set_res(dev, ABS_X, touch.panel_res);
> - input_abs_set_res(dev, ABS_Y, touch.panel_res);
> -
> - switch (touch.sensor_id) {
> - case 0:
> - case 2:
> - w8001->pktlen = W8001_PKTLEN_TOUCH93;
> - w8001->id = 0x93;
> - strlcat(w8001->name, " 1FG", sizeof(w8001->name));
> - break;
> -
> - case 1:
> - case 3:
> - case 4:
> - w8001->pktlen = W8001_PKTLEN_TOUCH9A;
> - strlcat(w8001->name, " 1FG", sizeof(w8001->name));
> - w8001->id = 0x9a;
> - break;
> -
> - case 5:
> - w8001->pktlen = W8001_PKTLEN_TOUCH2FG;
> -
> - __set_bit(BTN_TOOL_DOUBLETAP, dev->keybit);
> - input_mt_init_slots(dev, 2, 0);
> - input_set_abs_params(dev, ABS_MT_POSITION_X,
> - 0, touch.x, 0, 0);
> - input_set_abs_params(dev, ABS_MT_POSITION_Y,
> - 0, touch.y, 0, 0);
> - input_set_abs_params(dev, ABS_MT_TOOL_TYPE,
> - 0, MT_TOOL_MAX, 0, 0);
> -
> - strlcat(w8001->name, " 2FG", sizeof(w8001->name));
> - if (w8001->max_pen_x && w8001->max_pen_y)
> - w8001->id = 0xE3;
> - else
> - w8001->id = 0xE2;
> - break;
> - }
> + if (!w8001->response[1])
> + return 1;
> +
> + __set_bit(BTN_TOUCH, dev->keybit);
> + __set_bit(BTN_TOOL_FINGER, dev->keybit);
> +
> + parse_touchquery(w8001->response, &touch);
> + w8001->max_touch_x = touch.x;
> + w8001->max_touch_y = touch.y;
> +
> + if (w8001->max_pen_x && w8001->max_pen_y) {
> + /* if pen is supported scale to pen maximum */
> + touch.x = w8001->max_pen_x;
> + touch.y = w8001->max_pen_y;
> + touch.panel_res = W8001_PEN_RESOLUTION;
> + }
> +
> + input_set_abs_params(dev, ABS_X, 0, touch.x, 0, 0);
> + input_set_abs_params(dev, ABS_Y, 0, touch.y, 0, 0);
> + input_abs_set_res(dev, ABS_X, touch.panel_res);
> + input_abs_set_res(dev, ABS_Y, touch.panel_res);
> +
> + switch (touch.sensor_id) {
> + case 0:
> + case 2:
> + w8001->pktlen = W8001_PKTLEN_TOUCH93;
> + w8001->id = 0x93;
> + strlcat(w8001->name, " 1FG", sizeof(w8001->name));
> + break;
> +
> + case 1:
> + case 3:
> + case 4:
> + w8001->pktlen = W8001_PKTLEN_TOUCH9A;
> + strlcat(w8001->name, " 1FG", sizeof(w8001->name));
> + w8001->id = 0x9a;
> + break;
> +
> + case 5:
> + w8001->pktlen = W8001_PKTLEN_TOUCH2FG;
> +
> + __set_bit(BTN_TOOL_DOUBLETAP, dev->keybit);
> + input_mt_init_slots(dev, 2, 0);
> + input_set_abs_params(dev, ABS_MT_POSITION_X,
> + 0, touch.x, 0, 0);
> + input_set_abs_params(dev, ABS_MT_POSITION_Y,
> + 0, touch.y, 0, 0);
> + input_set_abs_params(dev, ABS_MT_TOOL_TYPE,
> + 0, MT_TOOL_MAX, 0, 0);
> +
> + strlcat(w8001->name, " 2FG", sizeof(w8001->name));
> + if (w8001->max_pen_x && w8001->max_pen_y)
> + w8001->id = 0xE3;
> + else
> + w8001->id = 0xE2;
> + break;
> }
>
> strlcat(w8001->name, " Touchscreen", sizeof(w8001->name));
>
> - return !err_pen || !err_touch;
> + return 0;
> }
>
> /*
> @@ -522,7 +541,7 @@ static int w8001_connect(struct serio *serio, struct
> serio_driver *drv)
> {
> struct w8001 *w8001;
> struct input_dev *input_dev;
> - int err;
> + int err, err_pen, err_touch;
>
> w8001 = kzalloc(sizeof(struct w8001), GFP_KERNEL);
> input_dev = input_allocate_device();
> @@ -541,10 +560,17 @@ static int w8001_connect(struct serio *serio, struct
> serio_driver *drv)
> if (err)
> goto fail2;
>
> - err = w8001_setup(w8001);
> + err = w8001_detect(w8001);
> if (err)
> goto fail3;
>
> + err_pen = w8001_setup_pen(w8001);
> + err_touch = w8001_setup_touch(w8001);
> + if (err_pen && err_touch) {
> + err = (err_touch == 1) ? err_pen : err_touch;
Let's just do
err = -ENXIO;
instead of trying to figure out error from which interface to report.
> + goto fail3;
> + }
> +
> input_dev->name = w8001->name;
> input_dev->phys = w8001->phys;
> input_dev->id.product = w8001->id;
> --
> 2.5.0
>
Thanks.
--
Dmitry
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