From 22e7db8111e4f2736280ed8f9c40c91e974794a7 Mon Sep 17 00:00:00 2001
From: Dudley Du <dudl@cypress.com>
Date: Sat, 17 Jan 2015 18:56:18 -0800
Subject: [PATCH] Input: cyapa - add power management interfaces support for
the device
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 according to their requirements.
Signed-off-by: Dudley Du <dudl@cypress.com>
Tested-by: Jeremiah Mahler <jmmahler@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
---
drivers/input/mouse/cyapa.c | 136 ++++++++++++++++++++++++++++++++++++
1 file changed, 136 insertions(+)
diff --git a/drivers/input/mouse/cyapa.c b/drivers/input/mouse/cyapa.c
index fa4d5010534d..63f6646faf5f 100644
--- a/drivers/input/mouse/cyapa.c
+++ b/drivers/input/mouse/cyapa.c
@@ -604,6 +604,136 @@ static irqreturn_t cyapa_irq(int irq, void *dev_id)
return IRQ_HANDLED;
}
+/*
+ **************************************************************
+ * sysfs interface
+ **************************************************************
+*/
+#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 error;
+
+ error = mutex_lock_interruptible(&cyapa->state_sync_lock);
+ if (error)
+ return error;
+
+ pwr_cmd = cyapa->suspend_power_mode;
+ sleep_time = cyapa->suspend_sleep_time;
+
+ mutex_unlock(&cyapa->state_sync_lock);
+
+ switch (pwr_cmd) {
+ case PWR_MODE_BTN_ONLY:
+ len = scnprintf(buf, PAGE_SIZE, "%s\n", BTN_ONLY_MODE_NAME);
+ break;
+
+ case PWR_MODE_OFF:
+ len = scnprintf(buf, PAGE_SIZE, "%s\n", OFF_MODE_NAME);
+ break;
+
+ default:
+ len = scnprintf(buf, PAGE_SIZE, "%u\n",
+ cyapa->gen == CYAPA_GEN3 ?
+ cyapa_pwr_cmd_to_sleep_time(pwr_cmd) :
+ sleep_time);
+ break;
+ }
+
+ return len;
+}
+
+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 error;
+
+ error = mutex_lock_interruptible(&cyapa->state_sync_lock);
+ if (error)
+ return error;
+
+ 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 = max_t(u16, sleep_time, 1000);
+ cyapa->suspend_power_mode =
+ cyapa_sleep_time_to_pwr_cmd(cyapa->suspend_sleep_time);
+ } else {
+ count = -EINVAL;
+ }
+
+ mutex_unlock(&cyapa->state_sync_lock);
+
+ return count;
+}
+
+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);
+}
+
+static int cyapa_prepare_wakeup_controls(struct cyapa *cyapa)
+{
+ struct i2c_client *client = cyapa->client;
+ struct device *dev = &client->dev;
+ int error;
+
+ if (device_can_wakeup(dev)) {
+ error = sysfs_merge_group(&client->dev.kobj,
+ &cyapa_power_wakeup_group);
+ if (error) {
+ dev_err(dev, "failed to add power wakeup group: %d\n",
+ error);
+ return error;
+ }
+
+ error = devm_add_action(dev,
+ cyapa_remove_power_wakeup_group, cyapa);
+ if (error) {
+ cyapa_remove_power_wakeup_group(cyapa);
+ dev_err(dev, "failed to add power cleanup action: %d\n",
+ error);
+ return error;
+ }
+ }
+
+ return 0;
+}
+#else
+static inline int cyapa_prepare_wakeup_controls(struct cyapa *cyapa)
+{
+ return 0;
+}
+#endif /* CONFIG_PM_SLEEP */
+
static int cyapa_probe(struct i2c_client *client,
const struct i2c_device_id *dev_id)
{
@@ -643,6 +773,12 @@ static int cyapa_probe(struct i2c_client *client,
return error;
}
+ error = cyapa_prepare_wakeup_controls(cyapa);
+ if (error) {
+ dev_err(dev, "failed to prepare wakeup controls: %d\n", error);
+ return error;
+ }
+
error = devm_request_threaded_irq(dev, client->irq,
NULL, cyapa_irq,
IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
--
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