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Subject[PATCH v9 05/18] input: cyapa: add power management interfaces supported for the device
Date
Add suspend_scanrate_ms power management interfaces in device's
power group, so users or applications can control the 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 | 112 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 112 insertions(+)

diff --git a/drivers/input/mouse/cyapa.c b/drivers/input/mouse/cyapa.c
index fac361a..420696d 100644
--- a/drivers/input/mouse/cyapa.c
+++ b/drivers/input/mouse/cyapa.c
@@ -505,6 +505,96 @@ u16 cyapa_pwr_cmd_to_sleep_time(u8 pwr_mode)
: (encoded_time - 5) * 20;
}

+#ifdef CONFIG_PM_SLEEP
+static ssize_t cyapa_show_suspend_scanrate(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct cyapa *cyapa = dev_get_drvdata(dev);
+ u8 pwr_cmd = cyapa->suspend_power_mode;
+ u16 sleep_time;
+ int len;
+ int ret;
+
+ ret = mutex_lock_interruptible(&cyapa->state_sync_lock);
+ if (ret)
+ return ret;
+ pwr_cmd = cyapa->suspend_power_mode;
+ sleep_time = cyapa->suspend_sleep_time;
+ mutex_unlock(&cyapa->state_sync_lock);
+
+ if (pwr_cmd == PWR_MODE_BTN_ONLY)
+ len = scnprintf(buf, PAGE_SIZE, "%s\n", BTN_ONLY_MODE_NAME);
+ else if (pwr_cmd == PWR_MODE_OFF)
+ len = scnprintf(buf, PAGE_SIZE, "%s\n", OFF_MODE_NAME);
+ else {
+ if (cyapa->gen == CYAPA_GEN3)
+ sleep_time = cyapa_pwr_cmd_to_sleep_time(pwr_cmd);
+ len = scnprintf(buf, PAGE_SIZE, "%u\n", sleep_time);
+ }
+
+ return len;
+}
+
+static u16 cyapa_clamp_sleep_time(u16 sleep_time)
+{
+ if (sleep_time > 1000)
+ sleep_time = 1000;
+ return sleep_time;
+}
+
+static ssize_t cyapa_update_suspend_scanrate(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct cyapa *cyapa = dev_get_drvdata(dev);
+ u16 sleep_time;
+ int ret;
+
+ ret = mutex_lock_interruptible(&cyapa->state_sync_lock);
+ if (ret)
+ return ret;
+
+ if (sysfs_streq(buf, BTN_ONLY_MODE_NAME))
+ cyapa->suspend_power_mode = PWR_MODE_BTN_ONLY;
+ else if (sysfs_streq(buf, OFF_MODE_NAME))
+ cyapa->suspend_power_mode = PWR_MODE_OFF;
+ else if (!kstrtou16(buf, 10, &sleep_time)) {
+ cyapa->suspend_sleep_time = cyapa_clamp_sleep_time(sleep_time);
+ cyapa->suspend_power_mode =
+ cyapa_sleep_time_to_pwr_cmd(cyapa->suspend_sleep_time);
+ } else
+ count = 0;
+
+ mutex_unlock(&cyapa->state_sync_lock);
+ if (!count)
+ dev_err(dev, "invalid suspend scanrate ms parameters\n");
+ return count ? count : -EINVAL;
+}
+
+static DEVICE_ATTR(suspend_scanrate_ms, S_IRUGO|S_IWUSR,
+ cyapa_show_suspend_scanrate,
+ cyapa_update_suspend_scanrate);
+
+static struct attribute *cyapa_power_wakeup_entries[] = {
+ &dev_attr_suspend_scanrate_ms.attr,
+ NULL,
+};
+
+static const struct attribute_group cyapa_power_wakeup_group = {
+ .name = power_group_name,
+ .attrs = cyapa_power_wakeup_entries,
+};
+
+static void cyapa_remove_power_wakeup_group(void *data)
+{
+ struct cyapa *cyapa = data;
+
+ sysfs_unmerge_group(&cyapa->client->dev.kobj,
+ &cyapa_power_wakeup_group);
+}
+#endif /* CONFIG_PM_SLEEP */
+
/*
* Returns:
* 0 Driver and device initialization successfully done.
@@ -588,6 +678,28 @@ static int cyapa_probe(struct i2c_client *client,
return ret;
}

+#ifdef CONFIG_PM_SLEEP
+ if (device_can_wakeup(dev)) {
+ ret = sysfs_merge_group(&client->dev.kobj,
+ &cyapa_power_wakeup_group);
+ if (ret) {
+ dev_err(dev, "failed to add power wakeup group, (%d)\n",
+ ret);
+ return ret;
+ }
+
+ ret = devm_add_action(dev,
+ cyapa_remove_power_wakeup_group, cyapa);
+ if (ret) {
+ cyapa_remove_power_wakeup_group(cyapa);
+ dev_err(dev,
+ "failed to add power cleanup action, (%d)\n",
+ ret);
+ return ret;
+ }
+ }
+#endif /* CONFIG_PM_SLEEP */
+
return 0;
}

--
1.9.1


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