Input: ads7846 - add wakeup support

Add wakeup support to the ads7846 driver. Platforms can enable wakeup
capability by setting the wakeup flag in ads7846_platform_data. With this
patch the ads7846 driver can be used to wake the system from suspend.

Signed-off-by: Ranjith Lohithakshan <ranjithl@ti.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

2 files changed, 11 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/ads7846.c b/drivers/input/touchscreen/ads7846.c
index d187be05955f..532279cda0e4 100644
--- a/drivers/input/touchscreen/ads7846.c
+++ b/drivers/input/touchscreen/ads7846.c
@@ -822,6 +822,9 @@ static int ads7846_suspend(struct spi_device *spi, pm_message_t message)
 
         spin_unlock_irq(&ts->lock);
 
+        if (device_may_wakeup(&ts->spi->dev))
+                enable_irq_wake(ts->spi->irq);
+
         return 0;
 
 }
@@ -830,6 +833,9 @@ static int ads7846_resume(struct spi_device *spi)
 {
         struct ads7846 *ts = dev_get_drvdata(&spi->dev);
 
+        if (device_may_wakeup(&ts->spi->dev))
+                disable_irq_wake(ts->spi->irq);
+
         spin_lock_irq(&ts->lock);
 
         ts->is_suspended = 0;
@@ -1201,6 +1207,8 @@ static int __devinit ads7846_probe(struct spi_device *spi)
         if (err)
                 goto err_remove_attr_group;
 
+        device_init_wakeup(&spi->dev, pdata->wakeup);
+
         return 0;
 
  err_remove_attr_group:
@@ -1230,6 +1238,8 @@ static int __devexit ads7846_remove(struct spi_device *spi)
 {
         struct ads7846          *ts = dev_get_drvdata(&spi->dev);
 
+        device_init_wakeup(&spi->dev, false);
+
         ads784x_hwmon_unregister(spi, ts);
         input_unregister_device(ts->input);
 
diff --git a/include/linux/spi/ads7846.h b/include/linux/spi/ads7846.h
index 5710c15d394a..b4ae570d3c98 100644
--- a/include/linux/spi/ads7846.h
+++ b/include/linux/spi/ads7846.h
@@ -53,5 +53,6 @@ struct ads7846_platform_data {
         int     (*filter)       (void *filter_data, int data_idx, int *val);
         void    (*filter_cleanup)(void *filter_data);
         void    (*wait_for_sync)(void);
+        bool    wakeup;
 };