linux-kernel - Re: [PATCH 3/4] mfd/menf21bmc.c: add additional sysfs entries for BMC status information

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Date:	Mon, 11 Jan 2016 11:38:01 +0100
From:	Andreas Werner <andreas.werner@....de>
To:	Lee Jones <lee.jones@...aro.org>
CC:	Andreas Werner <andreas.werner@....de>,
	<linux-kernel@...r.kernel.org>, <sameo@...ux.intel.com>
Subject: Re: [PATCH 3/4] mfd/menf21bmc.c: add additional sysfs entries for
 BMC status information

On Mon, Jan 11, 2016 at 10:30:39AM +0000, Lee Jones wrote:
> On Wed, 16 Dec 2015, Andreas Werner wrote:
> 
> > This patch adds additional sysfs entries to provide status
> > information to the userland.
> > 
> > The following informations are now provided:
> >         - Get operation hours counter
> >         - Get board slot address
> >         - Get powercycle counter
> >         - Set/get Hw Variant
> > 
> > Signed-off-by: Andreas Werner <andreas.werner@....de>
> > ---
> >  drivers/mfd/menf21bmc.c | 99 +++++++++++++++++++++++++++++++++++++++++++++++--
> >  1 file changed, 96 insertions(+), 3 deletions(-)
> > 
> > diff --git a/drivers/mfd/menf21bmc.c b/drivers/mfd/menf21bmc.c
> > index 742ffe7..dd068c0 100644
> > --- a/drivers/mfd/menf21bmc.c
> > +++ b/drivers/mfd/menf21bmc.c
> > @@ -20,6 +20,10 @@
> >  #define BMC_CMD_REV_MAJOR	0x80
> >  #define BMC_CMD_REV_MINOR	0x81
> >  #define BMC_CMD_REV_MAIN	0x82
> > +#define BMC_CMD_SLOT_ADDRESS	0x8c
> > +#define BMC_CMD_HW_VARIANT	0x8f
> > +#define BMC_CMD_PWRCYCL_CNT	0x93
> > +#define BMC_CMD_OP_HRS_CNT	0x94
> >  
> >  static struct mfd_cell menf21bmc_cell[] = {
> >  	{ .name = "menf21bmc_wdt", },
> > @@ -28,7 +32,7 @@ static struct mfd_cell menf21bmc_cell[] = {
> >  };
> >  
> >  static ssize_t menf21bmc_mode_show(struct device *dev,
> > -				  struct device_attribute *attr, char *buf)
> > +				   struct device_attribute *attr, char *buf)
> 
> This is an irrelevant change.  Please split it out.

Argh, my mistake. I will fix it and resend this patch.

> 
> >  {
> >  	struct i2c_client *client = to_i2c_client(dev);
> >  	int val;
> > @@ -41,8 +45,8 @@ static ssize_t menf21bmc_mode_show(struct device *dev,
> >  }
> >  
> >  static ssize_t menf21bmc_mode_store(struct device *dev,
> > -				   struct device_attribute *attr,
> > -				   const char *buf, size_t size)
> > +				    struct device_attribute *attr,
> > +				    const char *buf, size_t size)
> 
> This is an irrelevant change.  Please split it out.
> 
> >  {
> >  	struct i2c_client *client = to_i2c_client(dev);
> >  	unsigned long mode_val;
> > @@ -66,11 +70,100 @@ static ssize_t menf21bmc_mode_store(struct device *dev,
> >  	return size;
> >  }
> >  
> > +static ssize_t menf21bmc_hw_variant_show(struct device *dev,
> > +					 struct device_attribute *attr,
> > +					 char *buf)
> > +{
> > +	struct i2c_client *client = to_i2c_client(dev);
> > +	int val;
> > +
> > +	val = i2c_smbus_read_word_data(client, BMC_CMD_HW_VARIANT);
> > +	if (val < 0)
> > +		return val;
> > +
> > +	return sprintf(buf, "0x%04x\n", val);
> > +
> > +}
> > +
> > +static ssize_t menf21bmc_hw_variant_store(struct device *dev,
> > +					  struct device_attribute *attr,
> > +					  const char *buf, size_t size)
> > +{
> > +	struct i2c_client *client = to_i2c_client(dev);
> > +	unsigned long hw_variant;
> > +	int ret;
> > +
> > +	if (kstrtoul(buf, 0, &hw_variant))
> > +		return -EINVAL;
> > +
> > +	if (hw_variant < 0 || hw_variant > 0xffff)
> > +		return -EINVAL;
> > +
> > +	ret = i2c_smbus_write_word_data(client, BMC_CMD_HW_VARIANT,
> > +					hw_variant);
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	return size;
> > +
> > +}
> > +
> > +static ssize_t menf21bmc_pwrcycl_cnt_show(struct device *dev,
> > +					  struct device_attribute *attr,
> > +					  char *buf)
> > +{
> > +	struct i2c_client *client = to_i2c_client(dev);
> > +	int val;
> > +
> > +	val = i2c_smbus_read_word_data(client, BMC_CMD_PWRCYCL_CNT);
> > +	if (val < 0)
> > +		return val;
> > +
> > +	return sprintf(buf, "%d\n", val);
> > +}
> > +
> > +static ssize_t menf21bmc_op_hrs_cnt_show(struct device *dev,
> > +					 struct device_attribute *attr,
> > +					 char *buf)
> > +{
> > +	struct i2c_client *client = to_i2c_client(dev);
> > +	int val;
> > +
> > +	val = i2c_smbus_read_word_data(client, BMC_CMD_OP_HRS_CNT);
> > +	if (val < 0)
> > +		return val;
> > +
> > +	return sprintf(buf, "%d\n", val);
> > +}
> > +
> > +static ssize_t menf21bmc_slot_address_show(struct device *dev,
> > +					   struct device_attribute *attr,
> > +					   char *buf)
> > +{
> > +	struct i2c_client *client = to_i2c_client(dev);
> > +	int val;
> > +
> > +	val = i2c_smbus_read_byte_data(client, BMC_CMD_SLOT_ADDRESS);
> > +	if (val < 0)
> > +		return val;
> > +
> > +	return sprintf(buf, "%d\n", val);
> > +}
> > +
> >  static DEVICE_ATTR(mode, S_IRUGO | S_IWUSR, menf21bmc_mode_show,
> >  		   menf21bmc_mode_store);
> > +static DEVICE_ATTR(hw_variant, S_IRUGO | S_IWUSR, menf21bmc_hw_variant_show,
> > +		   menf21bmc_hw_variant_store);
> > +static DEVICE_ATTR(pwrcycl_cnt, S_IRUGO, menf21bmc_pwrcycl_cnt_show, NULL);
> > +static DEVICE_ATTR(op_hrs_cnt, S_IRUGO, menf21bmc_op_hrs_cnt_show, NULL);
> > +static DEVICE_ATTR(slot_address, S_IRUGO, menf21bmc_slot_address_show, NULL);
> >  
> >  static struct attribute *menf21bmc_attributes[] = {
> >  	&dev_attr_mode.attr,
> > +	&dev_attr_hw_variant.attr,
> > +	&dev_attr_pwrcycl_cnt.attr,
> > +	&dev_attr_op_hrs_cnt.attr,
> > +	&dev_attr_slot_address.attr,
> >  	NULL
> >  };
> >  
> 
> -- 
> Lee Jones
> Linaro STMicroelectronics Landing Team Lead
> Linaro.org │ Open source software for ARM SoCs
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