Re: [PATCH 1/3] hwmon: (pmbus/ibm-cffps) Add new manufacturer debugfs entries

[Guenter Roeck <linux@roeck-us.net>]

On Thu, Dec 19, 2019 at 02:50:05PM -0600, Eddie James wrote:
> Add support for a number of manufacturer-specific registers in the
> debugfs entries, as well as support to read and write the
> PMBUS_ON_OFF_CONFIG register through debugfs.
> 
> Signed-off-by: Eddie James <eajames@linux.ibm.com>

I assume you know what you are doing, letting the user write anything
into on_off_config. Applied to -next.

Guenter

> ---
>  drivers/hwmon/pmbus/ibm-cffps.c | 74 ++++++++++++++++++++++++++++++++++++++---
>  1 file changed, 70 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/hwmon/pmbus/ibm-cffps.c b/drivers/hwmon/pmbus/ibm-cffps.c
> index d359b76..a564be9 100644
> --- a/drivers/hwmon/pmbus/ibm-cffps.c
> +++ b/drivers/hwmon/pmbus/ibm-cffps.c
> @@ -20,7 +20,9 @@
>  
>  #define CFFPS_FRU_CMD				0x9A
>  #define CFFPS_PN_CMD				0x9B
> +#define CFFPS_HEADER_CMD			0x9C
>  #define CFFPS_SN_CMD				0x9E
> +#define CFFPS_MAX_POWER_OUT_CMD			0xA7
>  #define CFFPS_CCIN_CMD				0xBD
>  #define CFFPS_FW_CMD				0xFA
>  #define CFFPS1_FW_NUM_BYTES			4
> @@ -57,9 +59,12 @@ enum {
>  	CFFPS_DEBUGFS_INPUT_HISTORY = 0,
>  	CFFPS_DEBUGFS_FRU,
>  	CFFPS_DEBUGFS_PN,
> +	CFFPS_DEBUGFS_HEADER,
>  	CFFPS_DEBUGFS_SN,
> +	CFFPS_DEBUGFS_MAX_POWER_OUT,
>  	CFFPS_DEBUGFS_CCIN,
>  	CFFPS_DEBUGFS_FW,
> +	CFFPS_DEBUGFS_ON_OFF_CONFIG,
>  	CFFPS_DEBUGFS_NUM_ENTRIES
>  };
>  
> @@ -136,15 +141,15 @@ static ssize_t ibm_cffps_read_input_history(struct ibm_cffps *psu,
>  				       psu->input_history.byte_count);
>  }
>  
> -static ssize_t ibm_cffps_debugfs_op(struct file *file, char __user *buf,
> -				    size_t count, loff_t *ppos)
> +static ssize_t ibm_cffps_debugfs_read(struct file *file, char __user *buf,
> +				      size_t count, loff_t *ppos)
>  {
>  	u8 cmd;
>  	int i, rc;
>  	int *idxp = file->private_data;
>  	int idx = *idxp;
>  	struct ibm_cffps *psu = to_psu(idxp, idx);
> -	char data[I2C_SMBUS_BLOCK_MAX] = { 0 };
> +	char data[I2C_SMBUS_BLOCK_MAX + 2] = { 0 };
>  
>  	pmbus_set_page(psu->client, 0);
>  
> @@ -157,9 +162,20 @@ static ssize_t ibm_cffps_debugfs_op(struct file *file, char __user *buf,
>  	case CFFPS_DEBUGFS_PN:
>  		cmd = CFFPS_PN_CMD;
>  		break;
> +	case CFFPS_DEBUGFS_HEADER:
> +		cmd = CFFPS_HEADER_CMD;
> +		break;
>  	case CFFPS_DEBUGFS_SN:
>  		cmd = CFFPS_SN_CMD;
>  		break;
> +	case CFFPS_DEBUGFS_MAX_POWER_OUT:
> +		rc = i2c_smbus_read_word_swapped(psu->client,
> +						 CFFPS_MAX_POWER_OUT_CMD);
> +		if (rc < 0)
> +			return rc;
> +
> +		rc = snprintf(data, I2C_SMBUS_BLOCK_MAX, "%d", rc);
> +		goto done;
>  	case CFFPS_DEBUGFS_CCIN:
>  		rc = i2c_smbus_read_word_swapped(psu->client, CFFPS_CCIN_CMD);
>  		if (rc < 0)
> @@ -199,6 +215,14 @@ static ssize_t ibm_cffps_debugfs_op(struct file *file, char __user *buf,
>  			return -EOPNOTSUPP;
>  		}
>  		goto done;
> +	case CFFPS_DEBUGFS_ON_OFF_CONFIG:
> +		rc = i2c_smbus_read_byte_data(psu->client,
> +					      PMBUS_ON_OFF_CONFIG);
> +		if (rc < 0)
> +			return rc;
> +
> +		rc = snprintf(data, 3, "%02x", rc);
> +		goto done;
>  	default:
>  		return -EINVAL;
>  	}
> @@ -214,9 +238,42 @@ static ssize_t ibm_cffps_debugfs_op(struct file *file, char __user *buf,
>  	return simple_read_from_buffer(buf, count, ppos, data, rc);
>  }
>  
> +static ssize_t ibm_cffps_debugfs_write(struct file *file,
> +				       const char __user *buf, size_t count,
> +				       loff_t *ppos)
> +{
> +	u8 data;
> +	ssize_t rc;
> +	int *idxp = file->private_data;
> +	int idx = *idxp;
> +	struct ibm_cffps *psu = to_psu(idxp, idx);
> +
> +	switch (idx) {
> +	case CFFPS_DEBUGFS_ON_OFF_CONFIG:
> +		pmbus_set_page(psu->client, 0);
> +
> +		rc = simple_write_to_buffer(&data, 1, ppos, buf, count);
> +		if (rc < 0)
> +			return rc;
> +
> +		rc = i2c_smbus_write_byte_data(psu->client,
> +					       PMBUS_ON_OFF_CONFIG, data);
> +		if (rc)
> +			return rc;
> +
> +		rc = 1;
> +		break;
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	return rc;
> +}
> +
>  static const struct file_operations ibm_cffps_fops = {
>  	.llseek = noop_llseek,
> -	.read = ibm_cffps_debugfs_op,
> +	.read = ibm_cffps_debugfs_read,
> +	.write = ibm_cffps_debugfs_write,
>  	.open = simple_open,
>  };
>  
> @@ -486,15 +543,24 @@ static int ibm_cffps_probe(struct i2c_client *client,
>  	debugfs_create_file("part_number", 0444, ibm_cffps_dir,
>  			    &psu->debugfs_entries[CFFPS_DEBUGFS_PN],
>  			    &ibm_cffps_fops);
> +	debugfs_create_file("header", 0444, ibm_cffps_dir,
> +			    &psu->debugfs_entries[CFFPS_DEBUGFS_HEADER],
> +			    &ibm_cffps_fops);
>  	debugfs_create_file("serial_number", 0444, ibm_cffps_dir,
>  			    &psu->debugfs_entries[CFFPS_DEBUGFS_SN],
>  			    &ibm_cffps_fops);
> +	debugfs_create_file("max_power_out", 0444, ibm_cffps_dir,
> +			    &psu->debugfs_entries[CFFPS_DEBUGFS_MAX_POWER_OUT],
> +			    &ibm_cffps_fops);
>  	debugfs_create_file("ccin", 0444, ibm_cffps_dir,
>  			    &psu->debugfs_entries[CFFPS_DEBUGFS_CCIN],
>  			    &ibm_cffps_fops);
>  	debugfs_create_file("fw_version", 0444, ibm_cffps_dir,
>  			    &psu->debugfs_entries[CFFPS_DEBUGFS_FW],
>  			    &ibm_cffps_fops);
> +	debugfs_create_file("on_off_config", 0644, ibm_cffps_dir,
> +			    &psu->debugfs_entries[CFFPS_DEBUGFS_ON_OFF_CONFIG],
> +			    &ibm_cffps_fops);
>  
>  	return 0;
>  }