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Subject[PATCH v3 2/14] input: cyapa: add cyapa driver power management interfaces support
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 | 93 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 93 insertions(+)

diff --git a/drivers/input/mouse/cyapa.c b/drivers/input/mouse/cyapa.c
index bc735b3..992e02f 100644
--- a/drivers/input/mouse/cyapa.c
+++ b/drivers/input/mouse/cyapa.c
@@ -502,6 +502,90 @@ 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;
+
+ if (!cyapa_state_sync_enter(cyapa))
+ return -EBUSY;
+ pwr_cmd = cyapa->suspend_power_mode;
+ sleep_time = cyapa->suspend_sleep_time;
+ cyapa_state_sync_exit(cyapa);
+
+ 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;
+
+ if (buf == NULL || count == 0)
+ goto invalidparam;
+
+ if (!cyapa_state_sync_enter(cyapa))
+ return -EBUSY;
+
+ 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
+ goto invalidparam;
+
+ cyapa_state_sync_exit(cyapa);
+ return count;
+
+invalidparam:
+ cyapa_state_sync_exit(cyapa);
+ dev_err(dev, "invalid suspend scanrate ms parameters\n");
+ return -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;
@@ -598,6 +682,12 @@ static int cyapa_probe(struct i2c_client *client,
}
cyapa_disable_irq(cyapa);

+#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;

@@ -613,6 +703,9 @@ static int cyapa_remove(struct i2c_client *client)
{
struct cyapa *cyapa = i2c_get_clientdata(client);

+#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);
--
1.7.9.5



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