Input: ipaq-micro-ts - introduce open/close

Wire up open/close so we do not try to send events until someone uses them;
this also allows us to remove micro_ts_remove() and rely fully on managed
resources.

Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

1 files changed, 56 insertions, 32 deletions

diff --git a/drivers/input/touchscreen/ipaq-micro-ts.c b/drivers/input/touchscreen/ipaq-micro-ts.c
index 53fa5c361be1..62c8976e616f 100644
--- a/drivers/input/touchscreen/ipaq-micro-ts.c
+++ b/drivers/input/touchscreen/ipaq-micro-ts.c
@@ -46,17 +46,50 @@ static void micro_ts_receive(void *data, int len, unsigned char *msg)
         }
 }
 
+static void micro_ts_toggle_receive(struct touchscreen_data *ts, bool enable)
+{
+        struct ipaq_micro *micro = ts->micro;
+
+        spin_lock_irq(&micro->lock);
+
+        if (enable) {
+                micro->ts = micro_ts_receive;
+                micro->ts_data = ts;
+        } else {
+                micro->ts = NULL;
+                micro->ts_data = NULL;
+        }
+
+        spin_unlock_irq(&ts->micro->lock);
+}
+
+static int micro_ts_open(struct input_dev *input)
+{
+        struct touchscreen_data *ts = input_get_drvdata(input);
+
+        micro_ts_toggle_receive(ts, true);
+
+        return 0;
+}
+
+static void micro_ts_close(struct input_dev *input)
+{
+        struct touchscreen_data *ts = input_get_drvdata(input);
+
+        micro_ts_toggle_receive(ts, false);
+}
+
 static int micro_ts_probe(struct platform_device *pdev)
 {
+        struct ipaq_micro *micro = dev_get_drvdata(pdev->dev.parent);
         struct touchscreen_data *ts;
-        int ret;
+        int error;
 
         ts = devm_kzalloc(&pdev->dev, sizeof(*ts), GFP_KERNEL);
         if (!ts)
                 return -ENOMEM;
-        ts->micro = dev_get_drvdata(pdev->dev.parent);
 
-        platform_set_drvdata(pdev, ts);
+        ts->micro = micro;
 
         ts->input = devm_input_allocate_device(&pdev->dev);
         if (!ts->input) {
@@ -64,37 +97,27 @@ static int micro_ts_probe(struct platform_device *pdev)
                 return -ENOMEM;
         }
 
+        ts->input->name = "ipaq micro ts";
+        ts->input->open = micro_ts_open;
+        ts->input->close = micro_ts_close;
+
+        input_set_drvdata(ts->input, ts);
+
         input_set_capability(ts->input, EV_KEY, BTN_TOUCH);
         input_set_capability(ts->input, EV_ABS, ABS_X);
         input_set_capability(ts->input, EV_ABS, ABS_Y);
         input_set_abs_params(ts->input, ABS_X, 0, 1023, 0, 0);
         input_set_abs_params(ts->input, ABS_Y, 0, 1023, 0, 0);
 
-        ts->input->name = "ipaq micro ts";
-
-        ret = input_register_device(ts->input);
-        if (ret) {
+        error = input_register_device(ts->input);
+        if (error) {
                 dev_err(&pdev->dev, "error registering touch input\n");
-                return ret;
+                return error;
         }
 
-        spin_lock_irq(&ts->micro->lock);
-        ts->micro->ts = micro_ts_receive;
-        ts->micro->ts_data = ts;
-        spin_unlock_irq(&ts->micro->lock);
+        platform_set_drvdata(pdev, ts);
 
         dev_info(&pdev->dev, "iPAQ micro touchscreen\n");
-        return 0;
-}
-
-static int micro_ts_remove(struct platform_device *pdev)
-{
-        struct touchscreen_data *ts = platform_get_drvdata(pdev);
-
-        spin_lock_irq(&ts->micro->lock);
-        ts->micro->ts = NULL;
-        ts->micro->ts_data = NULL;
-        spin_unlock_irq(&ts->micro->lock);
 
         return 0;
 }
@@ -104,21 +127,23 @@ static int micro_ts_suspend(struct device *dev)
 {
         struct touchscreen_data *ts = dev_get_drvdata(dev);
 
-        spin_lock_irq(&ts->micro->lock);
-        ts->micro->ts = NULL;
-        ts->micro->ts_data = NULL;
-        spin_unlock_irq(&ts->micro->lock);
+        micro_ts_toggle_receive(ts, false);
+
         return 0;
 }
 
 static int micro_ts_resume(struct device *dev)
 {
         struct touchscreen_data *ts = dev_get_drvdata(dev);
+        struct input_dev *input = ts->input;
+
+        mutex_lock(&input->mutex);
+
+        if (input->users)
+                micro_ts_toggle_receive(ts, true);
+
+        mutex_unlock(&input->mutex);
 
-        spin_lock_irq(&ts->micro->lock);
-        ts->micro->ts = micro_ts_receive;
-        ts->micro->ts_data = ts;
-        spin_unlock_irq(&ts->micro->lock);
         return 0;
 }
 #endif
@@ -133,7 +158,6 @@ static struct platform_driver micro_ts_device_driver = {
                 .pm     = &micro_ts_dev_pm_ops,
         },
         .probe  = micro_ts_probe,
-        .remove = micro_ts_remove,
 };
 module_platform_driver(micro_ts_device_driver);