linux-kernel - Re: [PATCH v14 3/5] input: touchscreen: mxs-lradc: Add support for touchscreen

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Date:   Thu, 02 Mar 2017 00:25:52 +0100
From:   Harald Geyer <harald@...ib.org>
To:     Ksenija Stanojevic <ksenija.stanojevic@...il.com>
cc:     linux-kernel@...r.kernel.org, lee.jones@...aro.org,
        dmitry.torokhov@...il.com, linux-input@...r.kernel.org,
        jic23@...nel.org, knaack.h@....de, lars@...afoo.de,
        pmeerw@...erw.net, marex@...x.de, linux-iio@...r.kernel.org,
        harald@...ib.org, stefan.wahren@...e.com,
        fabio.estevam@...escale.com
Subject: Re: [PATCH v14 3/5] input: touchscreen: mxs-lradc: Add support for touchscreen

Hi Ksenija!

Ksenija Stanojevic writes:
> +static int mxs_lradc_ts_register(struct mxs_lradc_ts *ts)
> +{
> +	struct input_dev *input = ts->ts_input;
> +	struct device *dev = ts->dev;
> +
> +	input = devm_input_allocate_device(dev);
> +	if (!input)
> +		return -ENOMEM;
> +
> +	input->name = "mxs-lradc-ts";
> +	input->id.bustype = BUS_HOST;
> +	input->open = mxs_lradc_ts_open;
> +	input->close = mxs_lradc_ts_close;
> +
> +	__set_bit(EV_ABS, input->evbit);
> +	__set_bit(EV_KEY, input->evbit);
> +	__set_bit(BTN_TOUCH, input->keybit);
> +	__set_bit(INPUT_PROP_DIRECT, input->propbit);
> +	input_set_abs_params(input, ABS_X, 0, LRADC_SINGLE_SAMPLE_MASK, 0, 0);
> +	input_set_abs_params(input, ABS_Y, 0, LRADC_SINGLE_SAMPLE_MASK, 0, 0);
> +	input_set_abs_params(input, ABS_PRESSURE, 0, LRADC_SINGLE_SAMPLE_MASK,
> +			     0, 0);
> +
> +	ts->ts_input = input;
> +	input_set_drvdata(input, ts);
> +
> +	return input_register_device(input);
> +}
> +
> +static int mxs_lradc_ts_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct device_node *node = dev->parent->of_node;
> +	struct mxs_lradc *lradc = dev_get_drvdata(dev->parent);
> +	struct mxs_lradc_ts *ts;
> +	struct resource *iores;
> +	int ret, irq, virq, i;
> +	u32 ts_wires = 0, adapt;
> +
> +	ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL);
> +	if (!ts)
> +		return -ENOMEM;
> +
> +	platform_set_drvdata(pdev, ts);
> +
> +	ts->lradc = lradc;
> +	ts->dev = dev;
> +	spin_lock_init(&ts->lock);
> +
> +	iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	ts->base = devm_ioremap(dev, iores->start, resource_size(iores));
> +	if (IS_ERR(ts->base))
> +		return PTR_ERR(ts->base);
> +
> +	ret = of_property_read_u32(node, "fsl,lradc-touchscreen-wires",
> +				   &ts_wires);
> +	if (ret)
> +		return ret;
> +
> +	if (of_property_read_u32(node, "fsl,ave-ctrl", &adapt)) {
> +		ts->over_sample_cnt = 4;
> +	} else {
> +		if (adapt >= 1 || adapt <= 32) {
> +			ts->over_sample_cnt = adapt;
> +		} else {
> +			dev_err(ts->dev, "Invalid sample count (%u)\n",
> +				adapt);
> +			return -EINVAL;
> +		}
> +	}
> +
> +	if (of_property_read_u32(node, "fsl,ave-delay", &adapt)) {
> +		ts->over_sample_delay = 2;
> +	} else {
> +		if (adapt >= 2 || adapt <= LRADC_DELAY_DELAY_MASK + 1) {
> +			ts->over_sample_delay = adapt;
> +		} else {
> +			dev_err(ts->dev, "Invalid sample delay (%u)\n",
> +				adapt);
> +			return -EINVAL;
> +		}
> +	}
> +
> +	if (of_property_read_u32(node, "fsl,settling", &adapt)) {
> +		ts->settling_delay = 10;
> +	} else {
> +		if (adapt >= 1 || adapt <= LRADC_DELAY_DELAY_MASK) {
> +			ts->settling_delay = adapt;
> +		} else {
> +			dev_err(ts->dev, "Invalid settling delay (%u)\n",
> +				adapt);
> +			return -EINVAL;
> +		}
> +	}
> +
> +	ret = stmp_reset_block(ts->base);
> +	if (ret)
> +		return ret;
> +
> +	mxs_lradc_ts_hw_init(ts);
> +
> +	for (i = 0; i < 3; i++) {
> +		irq = platform_get_irq_byname(pdev, mxs_lradc_ts_irq_names[i]);
> +		if (irq < 0)
> +			return irq;
> +
> +		virq = irq_of_parse_and_map(node, irq);
> +
> +		mxs_lradc_ts_stop(ts);
> +
> +		ret = devm_request_irq(dev, virq,
> +				       mxs_lradc_ts_handle_irq,
> +				       0, mxs_lradc_ts_irq_names[i], ts);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	mxs_lradc_ts_register(ts);
> +
> +	return 0;

In case you end up creating v15, please check if the above can be:
return mxs_lradc_ts_register(ts);

Offtopic: This patch series has got the most contradictory review
comments I have seen so far at kernel work. Thanks for your tireless
effort to satisfy everybody. I'm looking forward to this getting merged.

Harald

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