recipes-kernel/linux/linux-ti33x-psp-3.2/0014-tscadc-switch-to-polling-instead-of-interrupts.patch

   1 From f36d060e6965cdbf797308fb2d80a77c4bbaeac3 Mon Sep 17 00:00:00 2001
   2 From: Joel A Fernandes <joelagnel@ti.com>
   3 Date: Tue, 29 Nov 2011 09:44:22 -0600
   4 Subject: [PATCH 14/21] tscadc: switch to polling instead of interrupts
   5
   6 Signed-off-by: Joel A Fernandes <joelagnel@ti.com>
   7 ---
   8  drivers/input/touchscreen/ti_tscadc.c |   16 ++++++++++++++--
   9  1 files changed, 14 insertions(+), 2 deletions(-)
  10
  11 diff --git a/drivers/input/touchscreen/ti_tscadc.c b/drivers/input/touchscreen/ti_tscadc.c
  12 index 1f9cbf5..8e2a994 100644
  13 --- a/drivers/input/touchscreen/ti_tscadc.c
  14 +++ b/drivers/input/touchscreen/ti_tscadc.c
  15 @@ -477,6 +477,8 @@ size_t do_adc_sample(struct kobject *kobj, struct attribute *attr, char *buf) {
  16         struct device *dev;
  17         struct tscadc *ts_dev;
  18         int channel_num;
  19 +       int fifo0count = 0;
  20 +       int read_sample = 0;
  21
  22         pdev = (struct platform_device *)container_of(kobj, struct device, kobj);
  23         dev = &pdev->dev;
  24 @@ -496,7 +498,17 @@ size_t do_adc_sample(struct kobject *kobj, struct attribute *attr, char *buf) {
  25
  26         tsc_adc_step_config(ts_dev, channel_num);
  27
  28 -       memcpy(buf, attr->name, strlen(attr->name)+1);
  29 +       do {
  30 +               fifo0count = tscadc_readl(ts_dev, TSCADC_REG_FIFO0CNT);
  31 +       }
  32 +       while (!fifo0count);
  33 +
  34 +       while (fifo0count--) {
  35 +                         read_sample = tscadc_readl(ts_dev, TSCADC_REG_FIFO0) & 0xfff;
  36 +                         // printk("polling sample: %d: %x\n", fifo0count, read_sample);
  37 +       }
  38 +       sprintf(buf, "%d", read_sample);
  39 +
  40         return strlen(attr->name);
  41  }
  42
  43 @@ -656,7 +668,7 @@ static      int __devinit tscadc_probe(struct platform_device *pdev)
  44         }
  45         else {
  46                 tscadc_writel(ts_dev, TSCADC_REG_FIFO0THR, 0);
  47 -               irqenable = TSCADC_IRQENB_FIFO0THRES;
  48 +               irqenable = 0; // TSCADC_IRQENB_FIFO0THRES;
  49         }
  50         tscadc_writel(ts_dev, TSCADC_REG_IRQENABLE, irqenable);
  51
  52 --
  53 1.7.7.4
  54