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Message-ID: <BAY176-DS1151EBC4B26491994A7AC1BDCF0@phx.gbl>
Date: Wed, 10 Sep 2014 12:34:20 +0800
From: Dudley Du <dudlx@...look.com>
To: <dmitry.torokhov@...il.com>, <rydberg@...omail.se>
CC: <bleung@...gle.com>, <patrikf@...gle.com>,
<linux-input@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v6 02/13] input: cyapa: add cyapa driver power management interfaces support
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@...ress.com>
---
drivers/input/mouse/cyapa.c | 85 +++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 85 insertions(+)
diff --git a/drivers/input/mouse/cyapa.c b/drivers/input/mouse/cyapa.c
index 3edd23e..d61ccbc 100644
--- a/drivers/input/mouse/cyapa.c
+++ b/drivers/input/mouse/cyapa.c
@@ -427,6 +427,82 @@ 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;
+
+ mutex_lock(&cyapa->state_sync_lock);
+ 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;
+
+ mutex_lock(&cyapa->state_sync_lock);
+
+ 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,
+};
+#endif /* CONFIG_PM_SLEEP */
+
void cyapa_detect_async(void *data, async_cookie_t cookie)
{
struct cyapa *cyapa = (struct cyapa *)data;
@@ -521,6 +597,12 @@ static int cyapa_probe(struct i2c_client *client,
goto err_uninit_tp_modules;
}
+#ifdef CONFIG_PM_SLEEP
+ if (device_can_wakeup(dev) &&
+ sysfs_merge_group(&client->dev.kobj, &cyapa_power_wakeup_group))
+ dev_warn(dev, "error creating wakeup power entries.\n");
+#endif /* CONFIG_PM_SLEEP */
+
async_schedule(cyapa_detect_and_start, cyapa);
return 0;
@@ -543,6 +625,9 @@ static int cyapa_remove(struct i2c_client *client)
cyapa->removed = true;
mutex_unlock(&cyapa->state_sync_lock);
+#ifdef CONFIG_PM_SLEEP
+ sysfs_unmerge_group(&client->dev.kobj, &cyapa_power_wakeup_group);
+#endif
free_irq(cyapa->irq, cyapa);
input_unregister_device(cyapa->input);
--
1.9.1
--
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