# atmel觸摸屏中斷改輪詢 普通電容式觸摸屏是中斷方式的，由于v3s引腳較少，所以嘗試改為輪詢方式驅動，節省一個IO。 ~~~ static int __devexit mxt_remove(struct i2c_client *client) #ifndef _TS_POLL free_irq(data->irq, data); #endif ~~~ ~~~ static int __devinit mxt_probe(struct i2c_client *client, const struct i2c_device_id *id) err_free_irq: #ifndef _TS_POLL free_irq(client->irq, data); #endif #ifndef _TS_POLL error = request_threaded_irq(client->irq, NULL, mxt_interrupt, pdata->irqflags, client->dev.driver->name, data); if (error) { dev_err(&client->dev, "Failed to register interrupt\n"); goto err_free_object; } error = input_register_device(input_dev); if (error) goto err_free_irq; #else { struct input_polled_dev *polled_dev; polled_dev = devm_input_allocate_polled_device(dev); if (!polled_dev) { dev_err(dev, "Failed to allocate polled input device\n"); return -ENOMEM; } polled_dev->private = data; polled_dev->poll = mxt_poll; polled_dev->poll_interval = POLL_INTERVAL; polled_dev->input = input_dev; error = input_register_polled_device(polled_dev); } #endif #ifdef _TS_POLL #define POLL_INTERVAL 5 static void mxt_poll(struct input_polled_dev *dev) { struct mxt_data *data = dev->private; struct mxt_message message; struct mxt_object *object; struct device *dev = &data->client->dev; int id; u8 reportid; u8 max_reportid; u8 min_reportid; do { if (mxt_read_message(data, &message)) { dev_err(dev, "Failed to read message\n"); goto end; } reportid = message.reportid; /* whether reportid is thing of MXT_TOUCH_MULTI_T9 */ object = mxt_get_object(data, MXT_TOUCH_MULTI_T9); if (!object) goto end; max_reportid = object->max_reportid; min_reportid = max_reportid - object->num_report_ids + 1; id = reportid - min_reportid; if (reportid >= min_reportid && reportid <= max_reportid) mxt_input_touchevent(data, &message, id); else mxt_dump_message(dev, &message); } while (reportid != 0xff); end: return; } #endif ~~~ ~~~ #ifndef _FLIP_X input_report_abs(input_dev, ABS_MT_POSITION_X, finger[id].x); #else input_report_abs(input_dev, ABS_MT_POSITION_X, 800-finger[id].x); #end #ifndef _FLIP_Y input_report_abs(input_dev, ABS_MT_POSITION_Y, finger[id].y); #else input_report_abs(input_dev, ABS_MT_POSITION_Y, 480-finger[id].y); #endif ~~~