drivers/input/touchscreen/dynapro.c

Source file repositories/reference/linux-study-clean/drivers/input/touchscreen/dynapro.c

File Facts

System
Linux kernel
Corpus path
drivers/input/touchscreen/dynapro.c
Extension
.c
Size
4436 bytes
Lines
186
Domain
Driver Families
Bucket
drivers/input
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct dynapro {
	struct input_dev *dev;
	struct serio *serio;
	int idx;
	unsigned char data[DYNAPRO_FORMAT_LENGTH];
	char phys[32];
};

static void dynapro_process_data(struct dynapro *pdynapro)
{
	struct input_dev *dev = pdynapro->dev;

	if (DYNAPRO_FORMAT_LENGTH == ++pdynapro->idx) {
		input_report_abs(dev, ABS_X, DYNAPRO_GET_XC(pdynapro->data));
		input_report_abs(dev, ABS_Y, DYNAPRO_GET_YC(pdynapro->data));
		input_report_key(dev, BTN_TOUCH,
				 DYNAPRO_GET_TOUCHED(pdynapro->data));
		input_sync(dev);

		pdynapro->idx = 0;
	}
}

static irqreturn_t dynapro_interrupt(struct serio *serio,
		unsigned char data, unsigned int flags)
{
	struct dynapro *pdynapro = serio_get_drvdata(serio);

	pdynapro->data[pdynapro->idx] = data;

	if (DYNAPRO_RESPONSE_BEGIN_BYTE & pdynapro->data[0])
		dynapro_process_data(pdynapro);
	else
		dev_dbg(&serio->dev, "unknown/unsynchronized data: %x\n",
			pdynapro->data[0]);

	return IRQ_HANDLED;
}

static void dynapro_disconnect(struct serio *serio)
{
	struct dynapro *pdynapro = serio_get_drvdata(serio);

	input_get_device(pdynapro->dev);
	input_unregister_device(pdynapro->dev);
	serio_close(serio);
	serio_set_drvdata(serio, NULL);
	input_put_device(pdynapro->dev);
	kfree(pdynapro);
}

/*
 * dynapro_connect() is the routine that is called when someone adds a
 * new serio device that supports dynapro protocol and registers it as
 * an input device. This is usually accomplished using inputattach.
 */

static int dynapro_connect(struct serio *serio, struct serio_driver *drv)
{
	struct dynapro *pdynapro;
	struct input_dev *input_dev;
	int err;

	pdynapro = kzalloc_obj(*pdynapro);
	input_dev = input_allocate_device();
	if (!pdynapro || !input_dev) {
		err = -ENOMEM;
		goto fail1;
	}

	pdynapro->serio = serio;
	pdynapro->dev = input_dev;
	scnprintf(pdynapro->phys, sizeof(pdynapro->phys),
		  "%s/input0", serio->phys);

	input_dev->name = "Dynapro Serial TouchScreen";
	input_dev->phys = pdynapro->phys;
	input_dev->id.bustype = BUS_RS232;
	input_dev->id.vendor = SERIO_DYNAPRO;
	input_dev->id.product = 0;
	input_dev->id.version = 0x0001;
	input_dev->dev.parent = &serio->dev;
	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
	input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
	input_set_abs_params(pdynapro->dev, ABS_X,
			     DYNAPRO_MIN_XC, DYNAPRO_MAX_XC, 0, 0);
	input_set_abs_params(pdynapro->dev, ABS_Y,
			     DYNAPRO_MIN_YC, DYNAPRO_MAX_YC, 0, 0);

	serio_set_drvdata(serio, pdynapro);

Annotation

Implementation Notes