Messages in this thread | | | From | Arnd Bergmann <> | Subject | Re: [PATCH 2/2] iio: exynos-adc: add experimental touchscreen support | Date | Mon, 21 Jul 2014 17:11:27 +0200 |
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On Monday 21 July 2014 07:44:42 Dmitry Torokhov wrote: > > > > > > It would be nice to actually close the device even if someone is > > > touching screen. Please implement open/close methods and have them set a > > > flag that you would check here. > > > > Ok. I think it's even better to move the request_irq() into the open function, > > which will avoid the flag and defer the error handling into the actual opening, > > as well as syncing the running irq with the close function. > > I do not quite like acquiring resources needed in open. I think drivers should > do all resource acquisition in probe() and leave open()/close() to > activate/quiesce devices.
Ok, I'll move it back then. I'm not sure what I'm supposed to do in open/close then. Isn't it enough to check info->input->users like this?
static irqreturn_t exynos_ts_isr(int irq, void *dev_id) { struct exynos_adc *info = dev_id; struct iio_dev *dev = dev_get_drvdata(info->dev); u32 x, y; bool pressed; int ret;
while (info->input->users) { ret = exynos_read_s3c64xx_ts(dev, &x, &y); if (ret == -ETIMEDOUT) break;
pressed = x & y & ADC_DATX_PRESSED; if (!pressed) { input_report_key(info->input, BTN_TOUCH, 0); input_sync(info->input); break; }
input_report_abs(info->input, ABS_X, x & ADC_DATX_MASK); input_report_abs(info->input, ABS_Y, y & ADC_DATY_MASK); input_report_key(info->input, BTN_TOUCH, 1); input_sync(info->input);
msleep(1); };
writel(0, ADC_V1_CLRINTPNDNUP(info->regs));
return IRQ_HANDLED; }
I could do enable_irq()/disable_irq(), but that leaves a small race at startup where we request the irq line and then immediately disable it again.
Arnd
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