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SubjectRe: [PATCH 3/4] mfd/menf21bmc.c: add additional sysfs entries for BMC status information
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@men.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.

> {
> 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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