git.openwrt.org Git - openwrt/staging/xback.git/blob

   1 From fa1cfb50169f27443a7fe0d5d9ad3ec77ba6b8c8 Mon Sep 17 00:00:00 2001
   2 From: Dave Stevenson <dave.stevenson@raspberrypi.com>
   3 Date: Fri, 6 Nov 2020 18:45:10 +0000
   4 Subject: [PATCH] Input: edt-ft5x06: Poll the device if no interrupt is
   5  configured.
   6
   7 Not all systems have the interrupt line wired up, so switch to
   8 polling the touchscreen off a timer if no interrupt line is
   9 configured.
  10
  11 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
  12 ---
  13  drivers/input/touchscreen/edt-ft5x06.c | 51 +++++++++++++++++++++-----
  14  1 file changed, 41 insertions(+), 10 deletions(-)
  15
  16 --- a/drivers/input/touchscreen/edt-ft5x06.c
  17 +++ b/drivers/input/touchscreen/edt-ft5x06.c
  18 @@ -75,6 +75,8 @@
  19  #define EDT_DEFAULT_NUM_X              1024
  20  #define EDT_DEFAULT_NUM_Y              1024
  21
  22 +#define POLL_INTERVAL_MS               17      /* 17ms = 60fps */
  23 +
  24  enum edt_pmode {
  25         EDT_PMODE_NOT_SUPPORTED,
  26         EDT_PMODE_HIBERNATE,
  27 @@ -136,6 +138,9 @@ struct edt_ft5x06_ts_data {
  28         enum edt_ver version;
  29         unsigned int crc_errors;
  30         unsigned int header_errors;
  31 +
  32 +       struct timer_list timer;
  33 +       struct work_struct work_i2c_poll;
  34  };
  35
  36  struct edt_i2c_chip_data {
  37 @@ -287,6 +292,22 @@ out:
  38         return IRQ_HANDLED;
  39  }
  40
  41 +static void edt_ft5x06_ts_irq_poll_timer(struct timer_list *t)
  42 +{
  43 +       struct edt_ft5x06_ts_data *tsdata = from_timer(tsdata, t, timer);
  44 +
  45 +       schedule_work(&tsdata->work_i2c_poll);
  46 +       mod_timer(&tsdata->timer, jiffies + msecs_to_jiffies(POLL_INTERVAL_MS));
  47 +}
  48 +
  49 +static void edt_ft5x06_ts_work_i2c_poll(struct work_struct *work)
  50 +{
  51 +       struct edt_ft5x06_ts_data *tsdata = container_of(work,
  52 +                       struct edt_ft5x06_ts_data, work_i2c_poll);
  53 +
  54 +       edt_ft5x06_ts_isr(0, tsdata);
  55 +}
  56 +
  57  static int edt_ft5x06_register_write(struct edt_ft5x06_ts_data *tsdata,
  58                                      u8 addr, u8 value)
  59  {
  60 @@ -1314,17 +1335,27 @@ static int edt_ft5x06_ts_probe(struct i2
  61
  62         i2c_set_clientdata(client, tsdata);
  63
  64 -       irq_flags = irq_get_trigger_type(client->irq);
  65 -       if (irq_flags == IRQF_TRIGGER_NONE)
  66 -               irq_flags = IRQF_TRIGGER_FALLING;
  67 -       irq_flags |= IRQF_ONESHOT;
  68 -
  69 -       error = devm_request_threaded_irq(&client->dev, client->irq,
  70 -                                       NULL, edt_ft5x06_ts_isr, irq_flags,
  71 -                                       client->name, tsdata);
  72 -       if (error) {
  73 -               dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
  74 -               return error;
  75 +       if (client->irq) {
  76 +               irq_flags = irq_get_trigger_type(client->irq);
  77 +               if (irq_flags == IRQF_TRIGGER_NONE)
  78 +                       irq_flags = IRQF_TRIGGER_FALLING;
  79 +               irq_flags |= IRQF_ONESHOT;
  80 +
  81 +               error = devm_request_threaded_irq(&client->dev, client->irq,
  82 +                                                 NULL, edt_ft5x06_ts_isr,
  83 +                                                 irq_flags, client->name,
  84 +                                                 tsdata);
  85 +               if (error) {
  86 +                       dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
  87 +                       return error;
  88 +               }
  89 +       } else {
  90 +               INIT_WORK(&tsdata->work_i2c_poll,
  91 +                         edt_ft5x06_ts_work_i2c_poll);
  92 +               timer_setup(&tsdata->timer, edt_ft5x06_ts_irq_poll_timer, 0);
  93 +               tsdata->timer.expires = jiffies +
  94 +                                       msecs_to_jiffies(POLL_INTERVAL_MS);
  95 +               add_timer(&tsdata->timer);
  96         }
  97
  98         error = devm_device_add_group(&client->dev, &edt_ft5x06_attr_group);