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Subject[PATCH v2 3/14] input: cyapa: add cyapa driver runtime power management interfaces supported
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 Chomebooks.

Signed-off-by: Du, Dudley <dudl@cypress.com>
---
diff --git a/drivers/input/mouse/cyapa.c b/drivers/input/mouse/cyapa.c
index 1dfc16d..c2b67d3 100644
--- a/drivers/input/mouse/cyapa.c
+++ b/drivers/input/mouse/cyapa.c
@@ -346,9 +346,16 @@ static int cyapa_check_is_operational(struct cyapa *cyapa)
static irqreturn_t cyapa_irq(int irq, void *dev_id)
{
struct cyapa *cyapa = dev_id;
+ struct device *dev = &cyapa->client->dev;
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);
+
/* interrupt event maybe cuased by host command to trackpad device. */
cont = true;
if (cyapa->ops->cyapa_irq_cmd_handler)
@@ -373,6 +380,8 @@ static irqreturn_t cyapa_irq(int irq, void *dev_id)

cyapa_state_sync_exit(cyapa);
}
+
+ pm_runtime_put_sync_autosuspend(dev);
out:
return IRQ_HANDLED;
}
@@ -574,6 +583,79 @@ static const struct attribute_group cyapa_power_wakeup_group = {
};
#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 = cyapa->runtime_suspend_power_mode;
+
+ if (cyapa->gen == CYAPA_GEN3)
+ return scnprintf(buf, PAGE_SIZE, "%u\n",
+ cyapa_pwr_cmd_to_sleep_time(pwr_cmd));
+ else
+ return scnprintf(buf, PAGE_SIZE, "%u\n",
+ cyapa->runtime_suspend_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;
+
+ 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);
+ cyapa->runtime_suspend_sleep_time = cyapa_sleep_time_check(time);
+ cyapa->runtime_suspend_power_mode =
+ cyapa_sleep_time_to_pwr_cmd(cyapa->runtime_suspend_sleep_time);
+ 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_start_runtime(struct cyapa *cyapa)
+{
+ 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);
+ if (sysfs_merge_group(&dev->kobj, &cyapa_power_runtime_group))
+ dev_warn(dev, "error creating wakeup runtime entries.\n");
+ pm_runtime_set_active(dev);
+ pm_runtime_use_autosuspend(dev);
+ pm_runtime_set_autosuspend_delay(dev, AUTOSUSPEND_DELAY);
+ pm_runtime_enable(dev);
+}
+#else
+static void cyapa_start_runtime(struct cyapa *cyapa) {}
+#endif /* CONFIG_PM_RUNTIME */
+
void cyapa_detect_async(void *data, async_cookie_t cookie)
{
struct cyapa *cyapa = (struct cyapa *)data;
@@ -589,7 +671,11 @@ void cyapa_detect_async(void *data, async_cookie_t cookie)

static void cyapa_detect_and_start(void *data, async_cookie_t cookie)
{
+ struct cyapa *cyapa = data;
+
cyapa_detect_async(data, cookie);
+
+ cyapa_start_runtime(cyapa);
}

static int cyapa_probe(struct i2c_client *client,
@@ -675,9 +761,15 @@ static int cyapa_remove(struct i2c_client *client)
{
struct cyapa *cyapa = i2c_get_clientdata(client);

+ pm_runtime_disable(&client->dev);
+
#ifdef CONFIG_PM_SLEEP
sysfs_unmerge_group(&client->dev.kobj, &cyapa_power_wakeup_group);
#endif
+
+#ifdef CONFIG_PM_RUNTIME
+ sysfs_unmerge_group(&client->dev.kobj, &cyapa_power_runtime_group);
+#endif
free_irq(cyapa->irq, cyapa);

input_unregister_device(cyapa->input);
@@ -735,12 +827,54 @@ static int cyapa_resume(struct device *dev)

async_schedule(cyapa_detect_async, cyapa);

+ /* runtime set active to reflect active state. */
+ pm_runtime_disable(dev);
+ pm_runtime_set_active(dev);
+ pm_runtime_enable(dev);
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);
+
+ if (cyapa->ops->cyapa_set_power_mode) {
+ /* set trackpad device to idle mode */
+ ret = cyapa->ops->cyapa_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);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int cyapa_runtime_resume(struct device *dev)
+{
+ int ret;
+ struct cyapa *cyapa = dev_get_drvdata(dev);
+
+ if (cyapa->ops->cyapa_set_power_mode) {
+ /* resume to full active mode */
+ ret = cyapa->ops->cyapa_set_power_mode(cyapa,
+ PWR_MODE_FULL_ACTIVE, 0);
+ if (ret)
+ dev_err(dev, "runtime resume failed, %d\n", ret);
+ return ret;
+ }
+
+ 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[] = {
diff --git a/drivers/input/mouse/cyapa.h b/drivers/input/mouse/cyapa.h
index 1780d82..91fb84a 100644
--- a/drivers/input/mouse/cyapa.h
+++ b/drivers/input/mouse/cyapa.h
@@ -199,6 +199,10 @@ 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 */

/* read from query data region. */
char product_id[16];
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