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>

diff --git a/drivers/input/mouse/cyapa.c b/drivers/input/mouse/cyapa.c
index fa4d5010534df5bc4da8be41e1e2ceec52c5a138..63f6646faf5fbdeb9cdf9aa6589e84bcc7f6cc50 100644 (file)
--- a/drivers/input/mouse/cyapa.c
+++ b/drivers/input/mouse/cyapa.c
@@ -604,6 +604,136 @@ out:
        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,