From mboxrd@z Thu Jan  1 00:00:00 1970
From: dmitry.torokhov@gmail.com (Dmitry Torokhov)
Date: Wed, 9 Dec 2009 19:21:49 -0800
Subject: [PATCH v2 08/09] input: enable touch on 88pm860x
In-Reply-To: <771cded00912090517l5665e02fj35e90d02932e545a@mail.gmail.com>
References: <771cded00912090517l5665e02fj35e90d02932e545a@mail.gmail.com>
Message-ID: <20091210032149.GH10138@core.coreip.homeip.net>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

Hi Haojian,

On Wed, Dec 09, 2009 at 08:17:20AM -0500, Haojian Zhuang wrote:
> +
> +	if (pen_down) {
> +		if ((x != 0) && (z1 != 0) && (touch->res_x != 0)) {
> +			rt = z2 / z1 - 1;
> +			rt = (rt * touch->res_x * x) >> ACCURATE_BIT;
> +			dev_dbg(chip->dev, "z1:%d, z2:%d, rt:%d\n",
> +				z1, z2, rt);
> +		}
> +		input_report_abs(touch->idev, ABS_X, x);
> +		input_report_abs(touch->idev, ABS_Y, y);
> +		input_report_abs(touch->idev, ABS_PRESSURE, rt);
> +		input_report_key(touch->idev, BTN_TOUCH, 1);
> +	} else {
> +		input_report_abs(touch->idev, ABS_PRESSURE, 0);
> +		input_report_key(touch->idev, BTN_TOUCH, 0);
> +	}
> +	input_sync(touch->idev);
> +	pm860x_unmask_irq(chip, irq);
> +
> +	if (pen_down)
> +		dev_dbg(chip->dev, "pen down at [%d, %d].\n", x, y);
> +	else
> +		dev_dbg(chip->dev, "pen release\n");

You already do conditon check up a few lines, just fold this one into
it. Compiler might do it for you but why can;t we help it?

> +out:
> +	return IRQ_HANDLED;
> +}
> +
> +static int pm860x_touch_open(struct input_dev *dev)
> +{
> +	struct pm860x_touch *touch = input_get_drvdata(dev);
> +	struct pm860x_chip *chip = touch->chip;
> +	int data, ret;
> +
> +	data = MEAS_PD_EN | MEAS_TSIX_EN | MEAS_TSIY_EN
> +		| MEAS_TSIZ1_EN | MEAS_TSIZ2_EN;
> +	ret = pm860x_set_bits(touch->i2c, MEAS_EN3, data, data);
> +	if (ret < 0)
> +		goto out;
> +	pm860x_unmask_irq(chip, touch->irq);
> +	return 0;
> +out:
> +	return ret;
> +}
> +
> +static void pm860x_touch_close(struct input_dev *dev)
> +{
> +	struct pm860x_touch *touch = input_get_drvdata(dev);
> +	struct pm860x_chip *chip = touch->chip;
> +	int data;
> +
> +	data = MEAS_PD_EN | MEAS_TSIX_EN | MEAS_TSIY_EN
> +		| MEAS_TSIZ1_EN | MEAS_TSIZ2_EN;
> +	pm860x_set_bits(touch->i2c, MEAS_EN3, data, 0);
> +	pm860x_mask_irq(chip, touch->irq);
> +}
> +
> +static int __devinit pm860x_touch_probe(struct platform_device *pdev)
> +{
> +	struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
> +	struct pm860x_platform_data *pm860x_pdata;
> +	struct pm860x_touch_pdata *pdata;
> +	struct pm860x_touch *touch;
> +	int irq, ret;
> +
> +	irq = platform_get_irq(pdev, 0);
> +	if (irq < 0) {
> +		dev_err(&pdev->dev, "No IRQ resource!\n");
> +		return -EINVAL;
> +	}
> +
> +	if (pdev->dev.parent->platform_data) {
> +		pm860x_pdata = pdev->dev.parent->platform_data;
> +		pdata = pm860x_pdata->touch;
> +	} else
> +		pdata = NULL;
> +
> +	if (pdata == NULL) {
> +		dev_err(&pdev->dev, "platform data isn't assigned to "
> +			"touch\n");
> +		return -EINVAL;
> +	}

This should be written as:

...
	struct pm860x_platform_data *pm860x_pdata = pdev->dev.parent->platform_data;
...

	if (pm860x_pdata) {
		pdata = pm860x_pdata->touch;
		if (!pdata) {
			dev_err(&pdev->dev,
				"touchscreen platform data is missing\n");
			return -EINVAL;
		}
	}

> +
> +	touch = kzalloc(sizeof(struct pm860x_touch), GFP_KERNEL);
> +	if (touch == NULL)
> +		return -ENOMEM;
> +	dev_set_drvdata(&pdev->dev, touch);
> +
> +	touch->idev = input_allocate_device();
> +	if (touch->idev == NULL) {
> +		dev_err(&pdev->dev, "Failed to allocate input device!\n");
> +		ret = -ENOMEM;
> +		goto out;
> +	}
> +
> +	touch->idev->name = "88pm860x-touch";
> +	touch->idev->phys = "88pm860x/input0";
> +	touch->idev->id.bustype = BUS_I2C;
> +	touch->idev->dev.parent = &pdev->dev;
> +	touch->idev->open = pm860x_touch_open;
> +	touch->idev->close = pm860x_touch_close;
> +	touch->chip = chip;
> +	touch->i2c = (chip->id == CHIP_PM8607) ? chip->client	\
> +			: chip->companion;

No need to escape newlines.

> +	touch->irq = irq;
> +	touch->res_x = pdata->res_x;
> +	input_set_drvdata(touch->idev, touch);
> +
> +	ret = pm860x_request_irq(chip, irq, pm860x_touch_handler, touch);
> +	if (ret < 0)
> +		goto out_irq;
> +
> +	__set_bit(EV_ABS, touch->idev->evbit);
> +	__set_bit(ABS_X, touch->idev->absbit);
> +	__set_bit(ABS_Y, touch->idev->absbit);
> +	__set_bit(ABS_PRESSURE, touch->idev->absbit);
> +	__set_bit(EV_SYN, touch->idev->evbit);
> +	__set_bit(EV_KEY, touch->idev->evbit);
> +	__set_bit(BTN_TOUCH, touch->idev->keybit);
> +
> +	input_set_abs_params(touch->idev, ABS_X, 0, 1 << ACCURATE_BIT, 0, 0);
> +	input_set_abs_params(touch->idev, ABS_Y, 0, 1 << ACCURATE_BIT, 0, 0);
> +	input_set_abs_params(touch->idev, ABS_PRESSURE, 0, 1 << ACCURATE_BIT,
> +				0, 0);
> +
> +	ret = input_register_device(touch->idev);
> +	if (ret < 0) {
> +		dev_err(chip->dev, "Failed to register touch!\n");
> +		goto out_rg;
> +	}
> +
> +	platform_set_drvdata(pdev, touch);
> +	return 0;
> +out_rg:
> +	pm860x_free_irq(chip, irq);
> +out_irq:
> +	input_free_device(touch->idev);
> +out:
> +	kfree(touch);
> +	return ret;
> +}
> +
> +static int __devexit pm860x_touch_remove(struct platform_device *pdev)
> +{
> +	struct pm860x_touch *touch = platform_get_drvdata(pdev);
> +
> +	input_unregister_device(touch->idev);
> +	pm860x_free_irq(touch->chip, touch->irq);

You need to kfree(touch) and platform_set_drvdata(pdev, NULL) would also
be prudent.
 
> +	return 0;
> +}
> +
> +static struct platform_driver pm860x_touch_driver = {
> +	.driver	= {
> +		.name	= "88pm860x-touch",
> +		.owner	= THIS_MODULE,
> +	},
> +	.probe	= pm860x_touch_probe,
> +	.remove	= __devexit_p(pm860x_touch_remove),
> +};
> +
> +static int __init pm860x_touch_init(void)
> +{
> +	return platform_driver_register(&pm860x_touch_driver);
> +}
> +module_init(pm860x_touch_init);
> +
> +static void __exit pm860x_touch_exit(void)
> +{
> +	platform_driver_unregister(&pm860x_touch_driver);
> +}
> +module_exit(pm860x_touch_exit);
> +
> +MODULE_DESCRIPTION("Touchscreen driver for Marvell Semiconductor 88PM860x");
> +MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS("platform:88pm860x-touch");
> +
> diff --git a/drivers/input/touchscreen/Kconfig
> b/drivers/input/touchscreen/Kconfig
> index 8cc453c..f4e6fd2 100644
> --- a/drivers/input/touchscreen/Kconfig
> +++ b/drivers/input/touchscreen/Kconfig
> @@ -530,4 +530,16 @@ config TOUCHSCREEN_PCAP
> 
>  	  To compile this driver as a module, choose M here: the
>  	  module will be called pcap_ts.
> +
> +config TOUCHSCREEN_88PM860X
> +	tristate "Marvell 88PM860x touchscreen"
> +	depends on MFD_88PM860X
> +	help
> +	  Say Y here if you have a 88PM860x PMIC and want to enable
> +	  support for the built-in touchscreen.
> +
> +	  If unsure, say N.
> +
> +	  To compile this driver as a module, choose M here: the
> +	  module will be called 88pm860x-ts.

Could you stick it somewhere in the middle of Kconfig file - it will
reduce chance of issues with merging. I assume you want to merge the
driver with the rest of the patches through MFD tree?

Other than that - looks good.

-- 
Dmitry