Hi Daniel,
2009/6/27 Daniel Ribeiro <drwyrm@xxxxxxxxx>:
> Touchscreen driver for PCAP2 PMIC.
>
Some more description in commit text really helps.
> +static irqreturn_t pcap_ts_event_touch(int pirq, void *data)
> +{
> + struct pcap_ts *pcap_ts = data;
> +
> + if (pcap_ts->read_state == PCAP_ADC_TS_M_STANDBY) {
> + pcap_ts->read_state = PCAP_ADC_TS_M_PRESSURE;
> + schedule_delayed_work(&pcap_ts->work, 0);
> + }
> + return IRQ_HANDLED;
> +}
> +
> +static int __devinit pcap_ts_probe(struct platform_device *pdev)
> +{
> + struct input_dev *input_dev;
> + struct pcap_ts *pcap_ts;
> + int err = -ENOMEM;
> +
> + pcap_ts = kzalloc(sizeof(*pcap_ts), GFP_KERNEL);
> + if (!pcap_ts)
> + return err;
> +
> + pcap_ts->pcap = platform_get_drvdata(pdev);
> + platform_set_drvdata(pdev, pcap_ts);
> +
> + input_dev = input_allocate_device();
> + if (!pcap_ts || !input_dev)
> + goto fail;
> +
> + INIT_DELAYED_WORK(&pcap_ts->work, pcap_ts_work);
> +
> + pcap_ts->read_state = PCAP_ADC_TS_M_STANDBY;
> +
> + pcap_ts->input = input_dev;
> +
> + input_dev->name = "pcap-touchscreen";
> + input_dev->phys = "pcap_ts/input0";
> + input_dev->id.bustype = BUS_HOST;
> + input_dev->id.vendor = 0x0001;
> + input_dev->id.product = 0x0002;
> + input_dev->id.version = 0x0100;
> + input_dev->dev.parent = &pdev->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(input_dev, ABS_X, X_AXIS_MIN, X_AXIS_MAX, 0, 0);
> + input_set_abs_params(input_dev, ABS_Y, Y_AXIS_MIN, Y_AXIS_MAX, 0, 0);
> + input_set_abs_params(input_dev, ABS_PRESSURE, PRESSURE_MIN,
> + PRESSURE_MAX, 0, 0);
> +
> + err = request_irq(pcap_to_irq(pcap_ts->pcap, PCAP_IRQ_TS),
> + pcap_ts_event_touch, 0, "Touch Screen", pcap_ts);
> + if (err)
> + goto fail;
> +
> + err = input_register_device(pcap_ts->input);
> + if (err)
> + goto fail_touch;
Please move request_irq after input_register_device, as IRQ can get
fired before input device gets available, right?
Overall driver is nice and clean.
--
---Trilok Soni
http://triloksoni.wordpress.com
http://www.linkedin.com/in/triloksoni
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