Input: ads7846 - add pen_down sysfs attribute
It's handy for userspace diagnostics to see the pen down status, to see whether the touchscreen is "stuck" (shortcircuited). Signed-off-by: Imre Deak <imre.deak@nokia.com> Signed-off-by: Juha Yrjola <juha.yrjola@nokia.com> Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
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@ -233,6 +233,21 @@ SHOW(temp1)
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SHOW(vaux)
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SHOW(vbatt)
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static int is_pen_down(struct device *dev)
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{
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struct ads7846 *ts = dev_get_drvdata(dev);
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return ts->pendown;
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}
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static ssize_t ads7846_pen_down_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "%u\n", is_pen_down(dev));
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}
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static DEVICE_ATTR(pen_down, S_IRUGO, ads7846_pen_down_show, NULL);
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/*--------------------------------------------------------------------------*/
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/*
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@ -559,6 +574,8 @@ static int __devinit ads7846_probe(struct spi_device *spi)
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device_create_file(&spi->dev, &dev_attr_vbatt);
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device_create_file(&spi->dev, &dev_attr_vaux);
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device_create_file(&spi->dev, &dev_attr_pen_down);
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err = input_register_device(input_dev);
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if (err)
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goto err_free_irq;
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@ -582,6 +599,8 @@ static int __devexit ads7846_remove(struct spi_device *spi)
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if (ts->irq_disabled)
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enable_irq(ts->spi->irq);
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device_remove_file(&spi->dev, &dev_attr_pen_down);
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if (ts->model == 7846) {
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device_remove_file(&spi->dev, &dev_attr_temp0);
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device_remove_file(&spi->dev, &dev_attr_temp1);
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