linux-kernel - Re: [PATCH RESEND 12/13] platform/chrome: cros_ec_lightbar

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Date:   Fri, 23 Jun 2017 15:12:39 -0700
From:   Benson Leung <bleung@...gle.com>
To:     Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        olof@...om.net, bleung@...omium.org, linux-kernel@...r.kernel.org
Cc:     lee.jones@...aro.org, Eric Caruso <ejcaruso@...omium.org>,
        Guenter Roeck <groeck@...omium.org>
Subject: Re: [PATCH RESEND 12/13] platform/chrome: cros_ec_lightbar - Add
 userspace lightbar control bit to EC

Hi Enric,

Looks good.

On 05/16/2017 09:13 AM, Enric Balletbo i Serra wrote:
> From: Eric Caruso <ejcaruso@...omium.org>
> 
> Some devices might want to turn off the lightbar if e.g. the
> system turns the screen off due to idleness. This prevents the
> kernel from going through its normal suspend/resume pathways.
> 
> Signed-off-by: Eric Caruso <ejcaruso@...omium.org>
> Signed-off-by: Guenter Roeck <groeck@...omium.org>
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>

Signed-off-by: Benson Leung <bleung@...omium.org>

Applied.

> ---
>  drivers/platform/chrome/cros_ec_lightbar.c | 38 ++++++++++++++++++++++++++++++
>  1 file changed, 38 insertions(+)
> 
> diff --git a/drivers/platform/chrome/cros_ec_lightbar.c b/drivers/platform/chrome/cros_ec_lightbar.c
> index 4df379d..e570c1e 100644
> --- a/drivers/platform/chrome/cros_ec_lightbar.c
> +++ b/drivers/platform/chrome/cros_ec_lightbar.c
> @@ -38,6 +38,12 @@
>  /* Rate-limit the lightbar interface to prevent DoS. */
>  static unsigned long lb_interval_jiffies = 50 * HZ / 1000;
>  
> +/*
> + * Whether or not we have given userspace control of the lightbar.
> + * If this is true, we won't do anything during suspend/resume.
> + */
> +static bool userspace_control;
> +
>  static ssize_t interval_msec_show(struct device *dev,
>  				  struct device_attribute *attr, char *buf)
>  {
> @@ -407,11 +413,17 @@ int lb_manual_suspend_ctrl(struct cros_ec_dev *ec, uint8_t enable)
>  
>  int lb_suspend(struct cros_ec_dev *ec)
>  {
> +	if (userspace_control)
> +		return 0;
> +
>  	return lb_send_empty_cmd(ec, LIGHTBAR_CMD_SUSPEND);
>  }
>  
>  int lb_resume(struct cros_ec_dev *ec)
>  {
> +	if (userspace_control)
> +		return 0;
> +
>  	return lb_send_empty_cmd(ec, LIGHTBAR_CMD_RESUME);
>  }
>  
> @@ -528,6 +540,30 @@ static ssize_t program_store(struct device *dev, struct device_attribute *attr,
>  	return ret;
>  }
>  
> +static ssize_t userspace_control_show(struct device *dev,
> +				      struct device_attribute *attr,
> +				      char *buf)
> +{
> +	return scnprintf(buf, PAGE_SIZE, "%d\n", userspace_control);
> +}
> +
> +static ssize_t userspace_control_store(struct device *dev,
> +				       struct device_attribute *attr,
> +				       const char *buf,
> +				       size_t count)
> +{
> +	bool enable;
> +	int ret;
> +
> +	ret = strtobool(buf, &enable);
> +	if (ret < 0)
> +		return ret;
> +
> +	userspace_control = enable;
> +
> +	return count;
> +}
> +
>  /* Module initialization */
>  
>  static DEVICE_ATTR_RW(interval_msec);
> @@ -536,6 +572,7 @@ static DEVICE_ATTR_WO(brightness);
>  static DEVICE_ATTR_WO(led_rgb);
>  static DEVICE_ATTR_RW(sequence);
>  static DEVICE_ATTR_WO(program);
> +static DEVICE_ATTR_RW(userspace_control);
>  
>  static struct attribute *__lb_cmds_attrs[] = {
>  	&dev_attr_interval_msec.attr,
> @@ -544,6 +581,7 @@ static struct attribute *__lb_cmds_attrs[] = {
>  	&dev_attr_led_rgb.attr,
>  	&dev_attr_sequence.attr,
>  	&dev_attr_program.attr,
> +	&dev_attr_userspace_control.attr,
>  	NULL,
>  };
>  
> 

-- 
Benson Leung
Staff Software Engineer
Chrome OS Kernel
Google Inc.
bleung@...gle.com
Chromium OS Project
bleung@...omium.org



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