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Date: Wed, 13 Mar 2013 16:50:48 -0700
From: Benson Leung <bleung@...omium.org>
To: rydberg@...omail.se, linux-input@...r.kernel.org,
linux-kernel@...r.kernel.org, dmitry.torokhov@...il.com
Cc: bleung@...omium.org, olofj@...omium.org, djkurtz@...omium.org,
dudl@...ress.com
Subject: [PATCH 1/4] Input: cyapa - Move common initialization to cyapa_detect
cyapa_check_is_operational and cyapa_create_input_dev are common to
the probe and firmware update paths. Pull those out into
cyapa_detect.
Signed-off-by: Benson Leung <bleung@...omium.org>
---
drivers/input/mouse/cyapa.c | 57 +++++++++++++++++++++++++++++++--------------
1 file changed, 39 insertions(+), 18 deletions(-)
diff --git a/drivers/input/mouse/cyapa.c b/drivers/input/mouse/cyapa.c
index b409c3d..a631aca 100644
--- a/drivers/input/mouse/cyapa.c
+++ b/drivers/input/mouse/cyapa.c
@@ -823,6 +823,40 @@ err_free_device:
return ret;
}
+static void cyapa_detect(struct cyapa *cyapa)
+{
+ struct device *dev = &cyapa->client->dev;
+ int ret;
+
+ ret = cyapa_check_is_operational(cyapa);
+ if (ret == -ETIMEDOUT)
+ dev_err(dev, "no device detected, %d\n", ret);
+ else if (ret)
+ dev_err(dev, "device detected, but not operational, %d\n", ret);
+
+ if (!cyapa->input) {
+ ret = cyapa_create_input_dev(cyapa);
+ if (ret)
+ dev_err(dev, "create input_dev instance failed, %d\n",
+ ret);
+
+ enable_irq(cyapa->irq);
+ /*
+ * On some systems, a system crash / warm boot does not reset
+ * the device's current power mode to FULL_ACTIVE.
+ * If such an event happens during suspend, after the device
+ * has been put in a low power mode, the device will still be
+ * in low power mode on a subsequent boot, since there was
+ * never a matching resume().
+ * Handle this by always forcing full power here, when a
+ * device is first detected to be in operational mode.
+ */
+ ret = cyapa_set_power_mode(cyapa, PWR_MODE_FULL_ACTIVE);
+ if (ret)
+ dev_warn(dev, "set active power failed, %d\n", ret);
+ }
+}
+
static int cyapa_probe(struct i2c_client *client,
const struct i2c_device_id *dev_id)
{
@@ -853,23 +887,8 @@ static int cyapa_probe(struct i2c_client *client,
if (adapter_func == CYAPA_ADAPTER_FUNC_SMBUS)
cyapa->smbus = true;
cyapa->state = CYAPA_STATE_NO_DEVICE;
- ret = cyapa_check_is_operational(cyapa);
- if (ret) {
- dev_err(dev, "device not operational, %d\n", ret);
- goto err_mem_free;
- }
- ret = cyapa_create_input_dev(cyapa);
- if (ret) {
- dev_err(dev, "create input_dev instance failed, %d\n", ret);
- goto err_mem_free;
- }
-
- ret = cyapa_set_power_mode(cyapa, PWR_MODE_FULL_ACTIVE);
- if (ret) {
- dev_err(dev, "set active power failed, %d\n", ret);
- goto err_unregister_device;
- }
+ cyapa_detect(cyapa);
cyapa->irq = client->irq;
ret = request_threaded_irq(cyapa->irq,
@@ -886,8 +905,8 @@ static int cyapa_probe(struct i2c_client *client,
return 0;
err_unregister_device:
- input_unregister_device(cyapa->input);
-err_mem_free:
+ if (cyapa->input)
+ input_unregister_device(cyapa->input);
kfree(cyapa);
return ret;
@@ -937,6 +956,8 @@ static int cyapa_resume(struct device *dev)
if (device_may_wakeup(dev) && cyapa->irq_wake)
disable_irq_wake(cyapa->irq);
+ cyapa_detect(cyapa);
+
ret = cyapa_set_power_mode(cyapa, PWR_MODE_FULL_ACTIVE);
if (ret)
dev_warn(dev, "resume active power failed, %d\n", ret);
--
1.8.1.3
--
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