Date:	Mon, 10 Nov 2014 11:05:32 +0000
From:	Dudley Du <dudl@...ress.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Dudley Du <dudley.dulixin@...il.com>
CC:	"rydberg@...omail.se" <rydberg@...omail.se>,
	"bleung@...gle.com" <bleung@...gle.com>,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v9 05/18] input: cyapa: add power management interfaces
 supported for the device

Thanks, Dmity

> -----Original Message-----
> From: Dmitry Torokhov [mailto:dmitry.torokhov@...il.com]
> Sent: 2014?11?10? 16:38
> To: Dudley Du
> Cc: rydberg@...omail.se; Dudley Du; bleung@...gle.com;
> linux-input@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH v9 05/18] input: cyapa: add power management interfaces
> supported for the device
>
> On Mon, Nov 03, 2014 at 04:32:57PM +0800, Dudley Du wrote:
> > 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 | 112
> ++++++++++++++++++++++++++++++++++++++++++++
> >  1 file changed, 112 insertions(+)
> >
> > diff --git a/drivers/input/mouse/cyapa.c b/drivers/input/mouse/cyapa.c
> > index fac361a..420696d 100644
> > --- a/drivers/input/mouse/cyapa.c
> > +++ b/drivers/input/mouse/cyapa.c
> > @@ -505,6 +505,96 @@ 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;
> > +int ret;
> > +
> > +ret = mutex_lock_interruptible(&cyapa->state_sync_lock);
> > +if (ret)
> > +return ret;
> > +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;
> > +int ret;
> > +
> > +ret = mutex_lock_interruptible(&cyapa->state_sync_lock);
> > +if (ret)
> > +return ret;
> > +
> > +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);
>
> I'd simply do
>
> cyapa->suspend_sleep_time = max_t(u16, sleep_time, 1000);
>
> here.

Thanks, applied.

>
> > +cyapa->suspend_power_mode =
> > +cyapa_sleep_time_to_pwr_cmd(cyapa->suspend_sleep_time);
> > +} else
> > +count = 0;
> > +
>
> If one branch uses curly braces then all branches shoudl use them, even
> if they contain only one statement.

Thanks, I will go through all code to follow this rule.

>
> > +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,
> > +};
> > +
> > +static void cyapa_remove_power_wakeup_group(void *data)
> > +{
> > +struct cyapa *cyapa = data;
> > +
> > +sysfs_unmerge_group(&cyapa->client->dev.kobj,
> > +&cyapa_power_wakeup_group);
> > +}
> > +#endif /* CONFIG_PM_SLEEP */
> > +
> >  /*
> >   * Returns:
> >   *   0    Driver and device initialization successfully done.
> > @@ -588,6 +678,28 @@ static int cyapa_probe(struct i2c_client *client,
> >  return ret;
> >  }
> >
> > +#ifdef CONFIG_PM_SLEEP
> > +if (device_can_wakeup(dev)) {
> > +ret = sysfs_merge_group(&client->dev.kobj,
> > +&cyapa_power_wakeup_group);
> > +if (ret) {
> > +dev_err(dev, "failed to add power wakeup group, (%d)\n",
> > +ret);
> > +return ret;
> > +}
> > +
> > +ret = devm_add_action(dev,
> > +cyapa_remove_power_wakeup_group, cyapa);
> > +if (ret) {
> > +cyapa_remove_power_wakeup_group(cyapa);
> > +dev_err(dev,
> > +"failed to add power cleanup action, (%d)\n",
> > +ret);
> > +return ret;
> > +}
> > +}
> > +#endif /* CONFIG_PM_SLEEP */
> > +
> >  return 0;
> >  }
> >
> > --
> > 1.9.1
> >
>
> --
> Dmitry

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