[v2,3/4] mfd: menf21bmc: Add additional sysfs entries for BMC status information

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@men.de>
---
 drivers/mfd/menf21bmc.c | 93 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 93 insertions(+)

On Mon, 11 Jan 2016, 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@men.de>
> ---
>  drivers/mfd/menf21bmc.c | 93 +++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 93 insertions(+)

Acked-by: Lee Jones <lee.jones@linaro.org>

> diff --git a/drivers/mfd/menf21bmc.c b/drivers/mfd/menf21bmc.c
> index b11bd6b..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", },
> @@ -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
>  };
>