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Input: rotary_encoder - add support for REL_* axes

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The rotary encoder driver only supports returning input events
for ABS_* axes, this adds support for REL_* axes.  The relative
axis input event is reported as -1 for each counter-clockwise
step and +1 for each clockwise step.

The ability to clamp the position of ABS_* axes between 0 and
a maximum of "steps" has also been added.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Daniel Mack <daniel@caiaq.de>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
H Hartley Sweeten
2009-04-17 20:12:35 -07:00
committed by Dmitry Torokhov
parent 3f3e7c6e13
commit bd3ce65560
3 changed files with 51 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files

61
drivers/input/misc/rotary_encoder.c
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@@ -26,13 +26,17 @@
#define DRV_NAME "rotary-encoder"
struct rotary_encoder {
unsigned int irq_a;
unsigned int irq_b;
unsigned int pos;
unsigned int armed;
unsigned int dir;
struct input_dev *input;
struct rotary_encoder_platform_data *pdata;
unsigned int axis;
unsigned int pos;
unsigned int irq_a;
unsigned int irq_b;
bool armed;
unsigned char dir; /* 0 - clockwise, 1 - CCW */
};
static irqreturn_t rotary_encoder_irq(int irq, void *dev_id)
@@ -53,21 +57,32 @@ static irqreturn_t rotary_encoder_irq(int irq, void *dev_id)
if (!encoder->armed)
break;
if (encoder->dir) {
/* turning counter-clockwise */
encoder->pos += pdata->steps;
encoder->pos--;
encoder->pos %= pdata->steps;
if (pdata->relative_axis) {
input_report_rel(encoder->input, pdata->axis,
encoder->dir ? -1 : 1);
} else {
/* turning clockwise */
encoder->pos++;
encoder->pos %= pdata->steps;
}
unsigned int pos = encoder->pos;
input_report_abs(encoder->input, pdata->axis, encoder->pos);
if (encoder->dir) {
/* turning counter-clockwise */
if (pdata->rollover)
pos += pdata->steps;
if (pos)
pos--;
} else {
/* turning clockwise */
if (pdata->rollover || pos < pdata->steps)
pos++;
}
if (pdata->rollover)
pos %= pdata->steps;
encoder->pos = pos;
input_report_abs(encoder->input, pdata->axis,
encoder->pos);
}
input_sync(encoder->input);
encoder->armed = 0;
encoder->armed = false;
break;
case 0x1:
@@ -77,7 +92,7 @@ static irqreturn_t rotary_encoder_irq(int irq, void *dev_id)
break;
case 0x3:
encoder->armed = 1;
encoder->armed = true;
break;
}
@@ -113,9 +128,15 @@ static int __devinit rotary_encoder_probe(struct platform_device *pdev)
input->name = pdev->name;
input->id.bustype = BUS_HOST;
input->dev.parent = &pdev->dev;
input->evbit[0] = BIT_MASK(EV_ABS);
input_set_abs_params(encoder->input,
pdata->axis, 0, pdata->steps, 0, 1);
if (pdata->relative_axis) {
input->evbit[0] = BIT_MASK(EV_REL);
input->relbit[0] = BIT_MASK(pdata->axis);
} else {
input->evbit[0] = BIT_MASK(EV_ABS);
input_set_abs_params(encoder->input,
pdata->axis, 0, pdata->steps, 0, 1);
}
err = input_register_device(input);
if (err) {