[PATCH 2/2] input: tsc2007: Don't require an interrupt to load

[Aaron Sierra]

When an IRQ isn't available, poll the device based on poll_period.

Signed-off-by: Aaron Sierra <asie...@xes-inc.com>
---
 drivers/input/touchscreen/tsc2007.c | 43 +++++++++++++++++++++++++++++++------
 1 file changed, 36 insertions(+), 7 deletions(-)

diff --git a/drivers/input/touchscreen/tsc2007.c 
b/drivers/input/touchscreen/tsc2007.c
index 4e97afb..e49a88f 100644
--- a/drivers/input/touchscreen/tsc2007.c
+++ b/drivers/input/touchscreen/tsc2007.c
@@ -71,6 +71,7 @@ struct tsc2007 {
        char                    phys[32];
 
        struct i2c_client       *client;
+       struct delayed_work     work;
 
        u16                     model;
        u16                     x_plate_ohms;
@@ -82,6 +83,7 @@ struct tsc2007 {
 
        unsigned                gpio;
        int                     irq;
+       bool                    using_irq;
 
        wait_queue_head_t       wait;
        bool                    stopped;
@@ -242,13 +244,27 @@ static irqreturn_t tsc2007_hard_irq(int irq, void *handle)
        return IRQ_HANDLED;
 }
 
+static void tsc2007_work(struct work_struct *work)
+{
+       struct tsc2007 *ts =
+               container_of(to_delayed_work(work), struct tsc2007, work);
+
+       tsc2007_soft_irq(ts->irq, ts);
+
+       /* reschedule the task */
+       schedule_delayed_work(&ts->work, ts->poll_period);
+}
+
 static void tsc2007_stop(struct tsc2007 *ts)
 {
        ts->stopped = true;
        mb();
        wake_up(&ts->wait);
 
-       disable_irq(ts->irq);
+       if (ts->using_irq)
+               disable_irq(ts->irq);
+       else
+               cancel_delayed_work_sync(&ts->work);
 }
 
 static int tsc2007_open(struct input_dev *input_dev)
@@ -259,7 +275,10 @@ static int tsc2007_open(struct input_dev *input_dev)
        ts->stopped = false;
        mb();
 
-       enable_irq(ts->irq);
+       if (ts->using_irq)
+               enable_irq(ts->irq);
+       else
+               schedule_delayed_work(&ts->work, ts->poll_period);
 
        /* Prepare for touch readings - power down ADC and enable PENIRQ */
        err = tsc2007_xfer(ts, PWRDOWN);
@@ -405,6 +424,7 @@ static int tsc2007_probe(struct i2c_client *client,
 
        ts->client = client;
        ts->irq = client->irq;
+       ts->using_irq = false;
        ts->input = input_dev;
        init_waitqueue_head(&ts->wait);
 
@@ -445,14 +465,23 @@ static int tsc2007_probe(struct i2c_client *client,
                        pdata->init_platform_hw();
        }
 
-       err = devm_request_threaded_irq(&client->dev, ts->irq,
+       if (ts->irq >= 0) {
+               err = devm_request_threaded_irq(&client->dev, ts->irq,
                                        tsc2007_hard_irq, tsc2007_soft_irq,
                                        IRQF_ONESHOT,
                                        client->dev.driver->name, ts);
-       if (err) {
-               dev_err(&client->dev, "Failed to request irq %d: %d\n",
-                       ts->irq, err);
-               return err;
+               if (err) {
+                       dev_warn(&client->dev, "Failed to request irq %d: %d\n",
+                               ts->irq, err);
+               } else {
+                       ts->using_irq = true;
+               }
+       }
+
+       if (!ts->using_irq) {
+               dev_info(&client->dev,
+                       "No IRQ, polling every %ld ms\n", ts->poll_period);
+               INIT_DELAYED_WORK(&ts->work, tsc2007_work);
        }
 
        tsc2007_stop(ts);
-- 
1.9.1
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