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Subject[PATCH v17 04/12] input: cyapa: add runtime power management interfaces support for the device
Date
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@cypress.com>
---
drivers/input/mouse/cyapa.c | 180 +++++++++++++++++++++++++++++++++++++++++++-
drivers/input/mouse/cyapa.h | 4 +
2 files changed, 183 insertions(+), 1 deletion(-)

diff --git a/drivers/input/mouse/cyapa.c b/drivers/input/mouse/cyapa.c
index 46d3830..080b93f 100644
--- a/drivers/input/mouse/cyapa.c
+++ b/drivers/input/mouse/cyapa.c
@@ -23,6 +23,7 @@
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
+#include <linux/pm_runtime.h>
#include "cyapa.h"


@@ -357,6 +358,10 @@ static int cyapa_open(struct input_dev *input)
}

enable_irq(client->irq);
+ if (!pm_runtime_enabled(&client->dev)) {
+ pm_runtime_set_active(&client->dev);
+ pm_runtime_enable(&client->dev);
+ }
out:
mutex_unlock(&cyapa->state_sync_lock);
return error;
@@ -370,8 +375,11 @@ static void cyapa_close(struct input_dev *input)
mutex_lock(&cyapa->state_sync_lock);

disable_irq(client->irq);
+ if (pm_runtime_enabled(&client->dev))
+ pm_runtime_disable(&client->dev);
if (cyapa->operational)
cyapa->ops->set_power_mode(cyapa, PWR_MODE_OFF, 0);
+ pm_runtime_set_suspended(&client->dev);

mutex_unlock(&cyapa->state_sync_lock);
}
@@ -539,6 +547,9 @@ static int cyapa_reinitialize(struct cyapa *cyapa)
struct input_dev *input = cyapa->input;
int error;

+ if (pm_runtime_enabled(dev))
+ pm_runtime_disable(dev);
+
/* Avoid command failures when TP was in OFF state. */
if (cyapa->operational)
cyapa->ops->set_power_mode(cyapa, PWR_MODE_FULL_ACTIVE, 0);
@@ -561,6 +572,13 @@ out:
/* Reset to power OFF state to save power when no user open. */
if (cyapa->operational)
cyapa->ops->set_power_mode(cyapa, PWR_MODE_OFF, 0);
+ } else if (!error && cyapa->operational) {
+ /*
+ * Make sure only enable runtime PM when device is
+ * in operational mode and input->users > 0.
+ */
+ pm_runtime_set_active(dev);
+ pm_runtime_enable(dev);
}

return error;
@@ -571,6 +589,7 @@ static irqreturn_t cyapa_irq(int irq, void *dev_id)
struct cyapa *cyapa = dev_id;
struct device *dev = &cyapa->client->dev;

+ pm_runtime_get_sync(dev);
if (device_may_wakeup(dev))
pm_wakeup_event(dev, 0);

@@ -601,6 +620,8 @@ static irqreturn_t cyapa_irq(int irq, void *dev_id)
}

out:
+ pm_runtime_mark_last_busy(dev);
+ pm_runtime_put_sync_autosuspend(dev);
return IRQ_HANDLED;
}

@@ -725,6 +746,118 @@ static inline int cyapa_prepare_wakeup_controls(struct cyapa *cyapa)
}
#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 error;
+
+ error = mutex_lock_interruptible(&cyapa->state_sync_lock);
+ if (error)
+ return error;
+ 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 error;
+
+ 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);
+ error = mutex_lock_interruptible(&cyapa->state_sync_lock);
+ if (error)
+ return error;
+ cyapa->runtime_suspend_sleep_time = max_t(u16, time, 1000);
+ 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)
+{
+ struct device *dev = &cyapa->client->dev;
+ int error;
+
+ cyapa->runtime_suspend_power_mode = PWR_MODE_IDLE;
+ cyapa->runtime_suspend_sleep_time =
+ cyapa_pwr_cmd_to_sleep_time(cyapa->runtime_suspend_power_mode);
+
+ error = sysfs_merge_group(&dev->kobj, &cyapa_power_runtime_group);
+ if (error) {
+ dev_err(dev,
+ "failed to create power runtime group: %d\n", error);
+ return error;
+ }
+
+ error = devm_add_action(dev, cyapa_remove_power_runtime_group, cyapa);
+ if (error) {
+ cyapa_remove_power_runtime_group(cyapa);
+ dev_err(dev,
+ "failed to add power runtime cleanup action: %d\n",
+ error);
+ return error;
+ }
+
+ /* runtime is enabled until device is operational and opened. */
+ pm_runtime_set_suspended(dev);
+ pm_runtime_use_autosuspend(dev);
+ pm_runtime_set_autosuspend_delay(dev, AUTOSUSPEND_DELAY);
+
+ return 0;
+}
+#else
+static inline int cyapa_start_runtime(struct cyapa *cyapa) { return 0; }
+#endif /* CONFIG_PM_RUNTIME */
+
static int cyapa_probe(struct i2c_client *client,
const struct i2c_device_id *dev_id)
{
@@ -770,6 +903,12 @@ static int cyapa_probe(struct i2c_client *client,
return error;
}

+ error = cyapa_start_runtime(cyapa);
+ if (error) {
+ dev_err(dev, "failed to start pm_runtime: %d\n", error);
+ return error;
+ }
+
error = devm_request_threaded_irq(dev, client->irq,
NULL, cyapa_irq,
IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
@@ -810,6 +949,13 @@ static int __maybe_unused cyapa_suspend(struct device *dev)
if (error)
return error;

+ /*
+ * Runtime PM is enable only when device is in operational mode and
+ * users in use, so need check it before disable it to
+ * avoid unbalance warning.
+ */
+ if (pm_runtime_enabled(dev))
+ pm_runtime_disable(dev);
disable_irq(client->irq);

/*
@@ -846,6 +992,7 @@ static int __maybe_unused cyapa_resume(struct device *dev)
cyapa->irq_wake = false;
}

+ /* Update device states and runtime PM states. */
error = cyapa_reinitialize(cyapa);
if (error)
dev_warn(dev, "failed to reinitialize TP device: %d\n", error);
@@ -856,7 +1003,38 @@ static int __maybe_unused cyapa_resume(struct device *dev)
return 0;
}

-static SIMPLE_DEV_PM_OPS(cyapa_pm_ops, cyapa_suspend, cyapa_resume);
+#ifdef CONFIG_PM_RUNTIME
+static int cyapa_runtime_suspend(struct device *dev)
+{
+ struct cyapa *cyapa = dev_get_drvdata(dev);
+ int error;
+
+ error = cyapa->ops->set_power_mode(cyapa,
+ cyapa->runtime_suspend_power_mode,
+ cyapa->runtime_suspend_sleep_time);
+ if (error)
+ dev_warn(dev, "runtime suspend failed: %d\n", error);
+
+ return 0;
+}
+
+static int cyapa_runtime_resume(struct device *dev)
+{
+ struct cyapa *cyapa = dev_get_drvdata(dev);
+ int error;
+
+ error = cyapa->ops->set_power_mode(cyapa, PWR_MODE_FULL_ACTIVE, 0);
+ if (error)
+ dev_warn(dev, "runtime resume failed: %d\n", error);
+
+ 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[] = {
{ "cyapa", 0 },
diff --git a/drivers/input/mouse/cyapa.h b/drivers/input/mouse/cyapa.h
index 481a60d..f5a2c22 100644
--- a/drivers/input/mouse/cyapa.h
+++ b/drivers/input/mouse/cyapa.h
@@ -242,6 +242,10 @@ struct cyapa {
/* power mode settings */
u8 suspend_power_mode;
u16 suspend_sleep_time;
+#ifdef CONFIG_PM_RUNTIME
+ u8 runtime_suspend_power_mode;
+ u16 runtime_suspend_sleep_time;
+#endif /* CONFIG_PM_RUNTIME */
u8 dev_pwr_mode;
u16 dev_sleep_time;

--
1.9.1


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