From 01ecd2297929ca81a6467e725ab1b8aa5461284e Mon Sep 17 00:00:00 2001 From: Dudley Du Date: Tue, 1 Jul 2014 14:36:55 +0800 Subject: [PATCH 03/14] input: cyapa: add cyapa driver runtime power management interfaces supported Add runtime_suspend_scanrate_ms power management interfaces in device's power group, so users or applications can control the runtime power management strategy of trackpad device as their requirements. TEST=test on Chomebooks. Signed-off-by: Dudley Du --- drivers/input/mouse/cyapa.c | 134 +++++++++++++++++++++++++++++++++++++++++++ drivers/input/mouse/cyapa.h | 4 ++ 2 files changed, 138 insertions(+) diff --git a/drivers/input/mouse/cyapa.c b/drivers/input/mouse/cyapa.c index 8005a51..784b5b9 100644 --- a/drivers/input/mouse/cyapa.c +++ b/drivers/input/mouse/cyapa.c @@ -346,9 +346,16 @@ static int cyapa_check_is_operational(struct cyapa *cyapa) static irqreturn_t cyapa_irq(int irq, void *dev_id) { struct cyapa *cyapa = dev_id; + struct device *dev = &cyapa->client->dev; struct input_dev *input = cyapa->input; bool cont; + pm_runtime_get_sync(dev); + pm_runtime_mark_last_busy(dev); + + if (device_may_wakeup(dev)) + pm_wakeup_event(dev, 0); + /* interrupt event maybe cuased by host command to trackpad device. */ cont = true; if (cyapa->ops->cyapa_irq_cmd_handler) @@ -373,6 +380,8 @@ static irqreturn_t cyapa_irq(int irq, void *dev_id) cyapa_state_sync_exit(cyapa); } + + pm_runtime_put_sync_autosuspend(dev); out: return IRQ_HANDLED; } @@ -575,6 +584,79 @@ static const struct attribute_group cyapa_power_wakeup_group = { }; #endif /* CONFIG_PM_SLEEP */ +#ifdef CONFIG_PM_RUNTIME +static ssize_t cyapa_show_rt_suspend_scanrate(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct cyapa *cyapa = dev_get_drvdata(dev); + u8 pwr_cmd = cyapa->runtime_suspend_power_mode; + + if (cyapa->gen == CYAPA_GEN3) + return scnprintf(buf, PAGE_SIZE, "%u\n", + cyapa_pwr_cmd_to_sleep_time(pwr_cmd)); + else + return scnprintf(buf, PAGE_SIZE, "%u\n", + cyapa->runtime_suspend_sleep_time); +} + +static ssize_t cyapa_update_rt_suspend_scanrate(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct cyapa *cyapa = dev_get_drvdata(dev); + u16 time; + + if (buf == NULL || count == 0 || kstrtou16(buf, 10, &time)) { + dev_err(dev, "invalid runtime suspend scanrate ms parameter\n"); + return -EINVAL; + } + + /* + * When the suspend scanrate is changed, pm_runtime_get to resume + * a potentially suspended device, update to the new pwr_cmd + * and then pm_runtime_put to suspend into the new power mode. + */ + pm_runtime_get_sync(dev); + cyapa->runtime_suspend_sleep_time = cyapa_sleep_time_check(time); + cyapa->runtime_suspend_power_mode = + cyapa_sleep_time_to_pwr_cmd(cyapa->runtime_suspend_sleep_time); + pm_runtime_put_sync_autosuspend(dev); + return count; +} + +static DEVICE_ATTR(runtime_suspend_scanrate_ms, S_IRUGO|S_IWUSR, + cyapa_show_rt_suspend_scanrate, + cyapa_update_rt_suspend_scanrate); + +static struct attribute *cyapa_power_runtime_entries[] = { + &dev_attr_runtime_suspend_scanrate_ms.attr, + NULL, +}; + +static const struct attribute_group cyapa_power_runtime_group = { + .name = power_group_name, + .attrs = cyapa_power_runtime_entries, +}; + +static void cyapa_start_runtime(struct cyapa *cyapa) +{ + struct device *dev = &cyapa->client->dev; + + cyapa->runtime_suspend_power_mode = PWR_MODE_IDLE; + cyapa->runtime_suspend_sleep_time = + cyapa_pwr_cmd_to_sleep_time(cyapa->runtime_suspend_power_mode); + if (sysfs_merge_group(&dev->kobj, &cyapa_power_runtime_group)) + dev_warn(dev, "error creating wakeup runtime entries.\n"); + pm_runtime_set_active(dev); + pm_runtime_use_autosuspend(dev); + pm_runtime_set_autosuspend_delay(dev, AUTOSUSPEND_DELAY); + pm_runtime_enable(dev); +} +#else +static void cyapa_start_runtime(struct cyapa *cyapa) {} +#endif /* CONFIG_PM_RUNTIME */ + void cyapa_detect_async(void *data, async_cookie_t cookie) { struct cyapa *cyapa = (struct cyapa *)data; @@ -590,7 +672,11 @@ void cyapa_detect_async(void *data, async_cookie_t cookie) static void cyapa_detect_and_start(void *data, async_cookie_t cookie) { + struct cyapa *cyapa = data; + cyapa_detect_async(data, cookie); + + cyapa_start_runtime(cyapa); } static int cyapa_probe(struct i2c_client *client, @@ -676,9 +762,15 @@ static int cyapa_remove(struct i2c_client *client) { struct cyapa *cyapa = i2c_get_clientdata(client); + pm_runtime_disable(&client->dev); + #ifdef CONFIG_PM_SLEEP sysfs_unmerge_group(&client->dev.kobj, &cyapa_power_wakeup_group); #endif + +#ifdef CONFIG_PM_RUNTIME + sysfs_unmerge_group(&client->dev.kobj, &cyapa_power_runtime_group); +#endif free_irq(cyapa->irq, cyapa); input_unregister_device(cyapa->input); @@ -736,12 +828,54 @@ static int cyapa_resume(struct device *dev) async_schedule(cyapa_detect_async, cyapa); + /* runtime set active to reflect active state. */ + pm_runtime_disable(dev); + pm_runtime_set_active(dev); + pm_runtime_enable(dev); return 0; } #endif /* CONFIG_PM_SLEEP */ +#ifdef CONFIG_PM_RUNTIME +static int cyapa_runtime_suspend(struct device *dev) +{ + int ret; + struct cyapa *cyapa = dev_get_drvdata(dev); + + if (cyapa->ops->cyapa_set_power_mode) { + /* set trackpad device to idle mode */ + ret = cyapa->ops->cyapa_set_power_mode(cyapa, + cyapa->runtime_suspend_power_mode, + cyapa->runtime_suspend_sleep_time); + if (ret) + dev_err(dev, "runtime suspend failed, %d\n", ret); + return ret; + } + + return 0; +} + +static int cyapa_runtime_resume(struct device *dev) +{ + int ret; + struct cyapa *cyapa = dev_get_drvdata(dev); + + if (cyapa->ops->cyapa_set_power_mode) { + /* resume to full active mode */ + ret = cyapa->ops->cyapa_set_power_mode(cyapa, + PWR_MODE_FULL_ACTIVE, 0); + if (ret) + dev_err(dev, "runtime resume failed, %d\n", ret); + return ret; + } + + return 0; +} +#endif /* CONFIG_PM_RUNTIME */ + static const struct dev_pm_ops cyapa_pm_ops = { SET_SYSTEM_SLEEP_PM_OPS(cyapa_suspend, cyapa_resume) + SET_RUNTIME_PM_OPS(cyapa_runtime_suspend, cyapa_runtime_resume, NULL) }; static const struct i2c_device_id cyapa_id_table[] = { diff --git a/drivers/input/mouse/cyapa.h b/drivers/input/mouse/cyapa.h index 1780d82..91fb84a 100644 --- a/drivers/input/mouse/cyapa.h +++ b/drivers/input/mouse/cyapa.h @@ -199,6 +199,10 @@ struct cyapa { /* power mode settings */ u8 suspend_power_mode; u16 suspend_sleep_time; +#ifdef CONFIG_PM_RUNTIME + u8 runtime_suspend_power_mode; + u16 runtime_suspend_sleep_time; +#endif /* CONFIG_PM_RUNTIME */ /* read from query data region. */ char product_id[16]; -- 1.7.9.5