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Message-Id: <1413357567-26177-4-git-send-email-dudl@cypress.com>
Date: Wed, 15 Oct 2014 15:19:17 +0800
From: Dudley Du <dudley.dulixin@...il.com>
To: dmitry.torokhov@...il.com, rydberg@...omail.se
Cc: Dudley Du <dudl@...ress.com>, bleung@...gle.com,
patrikf@...gle.com, linux-input@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH 03/13] input: cyapa: add cyapa driver runtime power management interfaces support
Add runtime_suspend_scanrate_ms power management interfaces in device's
power group, so users or applications can control the runtime power
management strategy of trackpad device as their requirements.
TEST=test on Chromebooks.
Signed-off-by: Dudley Du <dudl@...ress.com>
---
drivers/input/mouse/cyapa.c | 187 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 187 insertions(+)
diff --git a/drivers/input/mouse/cyapa.c b/drivers/input/mouse/cyapa.c
index cf2fcc4..5b2233b 100644
--- a/drivers/input/mouse/cyapa.c
+++ b/drivers/input/mouse/cyapa.c
@@ -24,6 +24,7 @@
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
+#include <linux/pm_runtime.h>
#include "cyapa.h"
@@ -266,6 +267,9 @@ static irqreturn_t cyapa_irq(int irq, void *dev_id)
struct input_dev *input = cyapa->input;
bool cont;
+ pm_runtime_get_sync(dev);
+ pm_runtime_mark_last_busy(dev);
+
if (device_may_wakeup(dev))
pm_wakeup_event(dev, 0);
@@ -291,6 +295,7 @@ static irqreturn_t cyapa_irq(int irq, void *dev_id)
mutex_unlock(&cyapa->state_sync_lock);
}
+ pm_runtime_put_sync_autosuspend(dev);
out:
return IRQ_HANDLED;
}
@@ -548,6 +553,119 @@ static void cyapa_remove_power_wakeup_group(void *data)
}
#endif /* CONFIG_PM_SLEEP */
+#ifdef CONFIG_PM_RUNTIME
+static ssize_t cyapa_show_rt_suspend_scanrate(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct cyapa *cyapa = dev_get_drvdata(dev);
+ u8 pwr_cmd;
+ u16 sleep_time;
+ int ret;
+
+ ret = mutex_lock_interruptible(&cyapa->state_sync_lock);
+ if (ret)
+ return ret;
+ pwr_cmd = cyapa->runtime_suspend_power_mode;
+ sleep_time = cyapa->runtime_suspend_sleep_time;
+ mutex_unlock(&cyapa->state_sync_lock);
+
+ if (cyapa->gen == CYAPA_GEN3)
+ return scnprintf(buf, PAGE_SIZE, "%u\n",
+ cyapa_pwr_cmd_to_sleep_time(pwr_cmd));
+ return scnprintf(buf, PAGE_SIZE, "%u\n", sleep_time);
+}
+
+static ssize_t cyapa_update_rt_suspend_scanrate(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct cyapa *cyapa = dev_get_drvdata(dev);
+ u16 time;
+ int ret;
+
+ if (buf == NULL || count == 0 || kstrtou16(buf, 10, &time)) {
+ dev_err(dev, "invalid runtime suspend scanrate ms parameter\n");
+ return -EINVAL;
+ }
+
+ /*
+ * When the suspend scanrate is changed, pm_runtime_get to resume
+ * a potentially suspended device, update to the new pwr_cmd
+ * and then pm_runtime_put to suspend into the new power mode.
+ */
+ pm_runtime_get_sync(dev);
+ ret = mutex_lock_interruptible(&cyapa->state_sync_lock);
+ if (ret)
+ return ret;
+ cyapa->runtime_suspend_sleep_time = cyapa_clamp_sleep_time(time);
+ cyapa->runtime_suspend_power_mode =
+ cyapa_sleep_time_to_pwr_cmd(cyapa->runtime_suspend_sleep_time);
+ mutex_unlock(&cyapa->state_sync_lock);
+ pm_runtime_put_sync_autosuspend(dev);
+
+ return count;
+}
+
+static DEVICE_ATTR(runtime_suspend_scanrate_ms, S_IRUGO|S_IWUSR,
+ cyapa_show_rt_suspend_scanrate,
+ cyapa_update_rt_suspend_scanrate);
+
+static struct attribute *cyapa_power_runtime_entries[] = {
+ &dev_attr_runtime_suspend_scanrate_ms.attr,
+ NULL,
+};
+
+static const struct attribute_group cyapa_power_runtime_group = {
+ .name = power_group_name,
+ .attrs = cyapa_power_runtime_entries,
+};
+
+static void cyapa_remove_power_runtime_group(void *data)
+{
+ struct cyapa *cyapa = data;
+
+ sysfs_unmerge_group(&cyapa->client->dev.kobj,
+ &cyapa_power_runtime_group);
+}
+
+static int cyapa_start_runtime(struct cyapa *cyapa)
+{
+ int ret;
+ struct device *dev = &cyapa->client->dev;
+
+ cyapa->runtime_suspend_power_mode = PWR_MODE_IDLE;
+ cyapa->runtime_suspend_sleep_time =
+ cyapa_pwr_cmd_to_sleep_time(cyapa->runtime_suspend_power_mode);
+
+ ret = sysfs_merge_group(&dev->kobj, &cyapa_power_runtime_group);
+ if (ret) {
+ dev_err(dev,
+ "failed to create power runtime group, %d\n", ret);
+ return ret;
+ }
+
+ ret = devm_add_action(dev, cyapa_remove_power_runtime_group, cyapa);
+ if (ret) {
+ cyapa_remove_power_runtime_group(cyapa);
+ dev_err(dev,
+ "failed to add power runtime cleanup action, (%d)\n",
+ ret);
+ return ret;
+ }
+
+ pm_runtime_set_active(dev);
+ pm_runtime_use_autosuspend(dev);
+ pm_runtime_set_autosuspend_delay(dev, AUTOSUSPEND_DELAY);
+ pm_runtime_enable(dev);
+
+ return 0;
+}
+#else
+static int cyapa_start_runtime(struct cyapa *cyapa) { return 0; }
+static void cyapa_remove_power_runtime_group(void *data) {}
+#endif /* CONFIG_PM_RUNTIME */
+
void cyapa_sync_detect(void *data, async_cookie_t cookie)
{
cyapa_detect_with_lock((struct cyapa *)data);
@@ -688,6 +806,12 @@ static int cyapa_probe(struct i2c_client *client,
}
#endif /* CONFIG_PM_SLEEP */
+ ret = cyapa_start_runtime(cyapa);
+ if (ret) {
+ dev_err(dev, "failed to start pm_runtime, (%d)\n, ", ret);
+ return ret;
+ }
+
return 0;
}
@@ -695,6 +819,7 @@ static int cyapa_remove(struct i2c_client *client)
{
struct cyapa *cyapa = i2c_get_clientdata(client);
+ pm_runtime_disable(&client->dev);
CYAPA_SET_FLAG(cyapa, CYAPA_DEV_REMOVED);
async_synchronize_cookie(cyapa->async_thread_cookie + 1);
@@ -721,6 +846,7 @@ static int cyapa_suspend(struct device *dev)
return ret;
}
+ pm_runtime_disable(dev);
/*
* Disable IRQ to avoid the command response interrupt cause system
* suspending process interrupted and failed.
@@ -744,6 +870,8 @@ static int cyapa_suspend(struct device *dev)
ret);
}
+ pm_runtime_set_suspended(dev);
+
if (device_may_wakeup(dev))
cyapa->irq_wake = (enable_irq_wake(cyapa->client->irq) == 0);
@@ -768,17 +896,76 @@ static int cyapa_resume(struct device *dev)
enable_irq(cyapa->client->irq);
CYAPA_CLEAR_FLAG(cyapa, CYAPA_IRQ_DISABLED);
+ /* Runtime set active to reflect active state. */
+ pm_runtime_set_active(dev);
+
/* Reset to active power state after re-detected. */
cyapa_detect(cyapa);
+ pm_runtime_enable(dev);
+
if (!ret)
mutex_unlock(&cyapa->state_sync_lock);
return 0;
}
#endif /* CONFIG_PM_SLEEP */
+#ifdef CONFIG_PM_RUNTIME
+static int cyapa_runtime_suspend(struct device *dev)
+{
+ int ret;
+ struct cyapa *cyapa = dev_get_drvdata(dev);
+
+ ret = mutex_lock_interruptible(&cyapa->state_sync_lock);
+ if (ret) {
+ dev_err(dev, "runtime suspend interrupted by signal, (%d)\n",
+ ret);
+ return 0;
+ }
+
+ if (cyapa->input && cyapa->ops->set_power_mode) {
+ /* Set trackpad device to idle mode. */
+ ret = cyapa->ops->set_power_mode(cyapa,
+ cyapa->runtime_suspend_power_mode,
+ cyapa->runtime_suspend_sleep_time);
+ if (ret)
+ dev_err(dev, "runtime suspend failed, %d\n", ret);
+ }
+
+ mutex_unlock(&cyapa->state_sync_lock);
+
+ return 0;
+}
+
+static int cyapa_runtime_resume(struct device *dev)
+{
+ int ret;
+ struct cyapa *cyapa = dev_get_drvdata(dev);
+
+ ret = mutex_lock_interruptible(&cyapa->state_sync_lock);
+ if (ret) {
+ dev_err(dev, "runtime resume interrupted by signal, (%d)\n",
+ ret);
+ return 0;
+ }
+
+ if (cyapa->input && cyapa->ops->set_power_mode) {
+ /* Resume to full active mode. */
+ ret = cyapa->ops->set_power_mode(cyapa,
+ PWR_MODE_FULL_ACTIVE, 0);
+ if (ret)
+ dev_err(dev, "runtime resume failed, %d\n", ret);
+ }
+
+ mutex_unlock(&cyapa->state_sync_lock);
+
+ return 0;
+}
+#endif /* CONFIG_PM_RUNTIME */
+
static const struct dev_pm_ops cyapa_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(cyapa_suspend, cyapa_resume)
+ SET_RUNTIME_PM_OPS(cyapa_runtime_suspend, cyapa_runtime_resume, NULL)
};
static const struct i2c_device_id cyapa_id_table[] = {
--
1.9.1
--
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