diff mbox series

[3/3] pmbus: ibm-cffps: Add support for version 2 of the PSU

Message ID 1567181385-22129-4-git-send-email-eajames@linux.ibm.com
State Superseded, archived
Headers show
Series pmbus: ibm-cffps: Add support for version 2 of PSU | expand

Commit Message

Eddie James Aug. 30, 2019, 4:09 p.m. UTC 
Version 2 of the PSU supports a second page of data and changes the
format of the FW version. Use the devicetree binding to differentiate
between the version the driver should use.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/hwmon/pmbus/ibm-cffps.c | 109 ++++++++++++++++++++++++++++++++--------
 1 file changed, 87 insertions(+), 22 deletions(-)

Comments

Guenter Roeck Aug. 30, 2019, 5:36 p.m. UTC | #1 
On Fri, Aug 30, 2019 at 11:09:45AM -0500, Eddie James wrote:
> Version 2 of the PSU supports a second page of data and changes the
> format of the FW version. Use the devicetree binding to differentiate
> between the version the driver should use.
> 
> Signed-off-by: Eddie James <eajames@linux.ibm.com>
> ---
>  drivers/hwmon/pmbus/ibm-cffps.c | 109 ++++++++++++++++++++++++++++++++--------
>  1 file changed, 87 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/hwmon/pmbus/ibm-cffps.c b/drivers/hwmon/pmbus/ibm-cffps.c
> index ee2ee9e..ca26fbd 100644
> --- a/drivers/hwmon/pmbus/ibm-cffps.c
> +++ b/drivers/hwmon/pmbus/ibm-cffps.c
> @@ -12,16 +12,20 @@
>  #include <linux/leds.h>
>  #include <linux/module.h>
>  #include <linux/mutex.h>
> +#include <linux/of_device.h>
>  #include <linux/pmbus.h>
>  
>  #include "pmbus.h"
>  
> +#define CFFPS_VERSIONS				2
> +

Any chance you can use an enum for the versions ? Using version
numbers 1/2 combined with array indices 0/1 is confusing, error
prone, and seems unnecessary.

Thanks,
Guenter

>  #define CFFPS_FRU_CMD				0x9A
>  #define CFFPS_PN_CMD				0x9B
>  #define CFFPS_SN_CMD				0x9E
>  #define CFFPS_CCIN_CMD				0xBD
> -#define CFFPS_FW_CMD_START			0xFA
> -#define CFFPS_FW_NUM_BYTES			4
> +#define CFFPS_FW_CMD				0xFA
> +#define CFFPS1_FW_NUM_BYTES			4
> +#define CFFPS2_FW_NUM_WORDS			3
>  #define CFFPS_SYS_CONFIG_CMD			0xDA
>  
>  #define CFFPS_INPUT_HISTORY_CMD			0xD6
> @@ -61,6 +65,7 @@ struct ibm_cffps_input_history {
>  };
>  
>  struct ibm_cffps {
> +	int version;
>  	struct i2c_client *client;
>  
>  	struct ibm_cffps_input_history input_history;
> @@ -132,6 +137,8 @@ static ssize_t ibm_cffps_debugfs_op(struct file *file, char __user *buf,
>  	struct ibm_cffps *psu = to_psu(idxp, idx);
>  	char data[I2C_SMBUS_BLOCK_MAX] = { 0 };
>  
> +	pmbus_set_page(psu->client, 0);
> +
>  	switch (idx) {
>  	case CFFPS_DEBUGFS_INPUT_HISTORY:
>  		return ibm_cffps_read_input_history(psu, buf, count, ppos);
> @@ -152,16 +159,36 @@ static ssize_t ibm_cffps_debugfs_op(struct file *file, char __user *buf,
>  		rc = snprintf(data, 5, "%04X", rc);
>  		goto done;
>  	case CFFPS_DEBUGFS_FW:
> -		for (i = 0; i < CFFPS_FW_NUM_BYTES; ++i) {
> -			rc = i2c_smbus_read_byte_data(psu->client,
> -						      CFFPS_FW_CMD_START + i);
> -			if (rc < 0)
> -				return rc;
> +		switch (psu->version) {
> +		case 1:
> +			for (i = 0; i < CFFPS1_FW_NUM_BYTES; ++i) {
> +				rc = i2c_smbus_read_byte_data(psu->client,
> +							      CFFPS_FW_CMD +
> +								i);
> +				if (rc < 0)
> +					return rc;
> +
> +				snprintf(&data[i * 2], 3, "%02X", rc);
> +			}
>  
> -			snprintf(&data[i * 2], 3, "%02X", rc);
> -		}
> +			rc = i * 2;
> +			break;
> +		case 2:
> +			for (i = 0; i < CFFPS2_FW_NUM_WORDS; ++i) {
> +				rc = i2c_smbus_read_word_data(psu->client,
> +							      CFFPS_FW_CMD +
> +								i);
> +				if (rc < 0)
> +					return rc;
> +
> +				snprintf(&data[i * 4], 5, "%04X", rc);
> +			}
>  
> -		rc = i * 2;
> +			rc = i * 4;
> +			break;
> +		default:
> +			return -EOPNOTSUPP;
> +		}
>  		goto done;
>  	default:
>  		return -EINVAL;
> @@ -279,6 +306,8 @@ static void ibm_cffps_led_brightness_set(struct led_classdev *led_cdev,
>  			psu->led_state = CFFPS_LED_ON;
>  	}
>  
> +	pmbus_set_page(psu->client, 0);
> +
>  	rc = i2c_smbus_write_byte_data(psu->client, CFFPS_SYS_CONFIG_CMD,
>  				       psu->led_state);
>  	if (rc < 0)
> @@ -299,6 +328,8 @@ static int ibm_cffps_led_blink_set(struct led_classdev *led_cdev,
>  	if (led_cdev->brightness == LED_OFF)
>  		return 0;
>  
> +	pmbus_set_page(psu->client, 0);
> +
>  	rc = i2c_smbus_write_byte_data(psu->client, CFFPS_SYS_CONFIG_CMD,
>  				       CFFPS_LED_BLINK);
>  	if (rc < 0)
> @@ -328,15 +359,32 @@ static void ibm_cffps_create_led_class(struct ibm_cffps *psu)
>  		dev_warn(dev, "failed to register led class: %d\n", rc);
>  }
>  
> -static struct pmbus_driver_info ibm_cffps_info = {
> -	.pages = 1,
> -	.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
> -		PMBUS_HAVE_PIN | PMBUS_HAVE_FAN12 | PMBUS_HAVE_TEMP |
> -		PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_VOUT |
> -		PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_INPUT |
> -		PMBUS_HAVE_STATUS_TEMP | PMBUS_HAVE_STATUS_FAN12,
> -	.read_byte_data = ibm_cffps_read_byte_data,
> -	.read_word_data = ibm_cffps_read_word_data,
> +static struct pmbus_driver_info ibm_cffps_info[CFFPS_VERSIONS] = {
> +	[0] = {
> +		.pages = 1,
> +		.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
> +			PMBUS_HAVE_PIN | PMBUS_HAVE_FAN12 | PMBUS_HAVE_TEMP |
> +			PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 |
> +			PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT |
> +			PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP |
> +			PMBUS_HAVE_STATUS_FAN12,
> +		.read_byte_data = ibm_cffps_read_byte_data,
> +		.read_word_data = ibm_cffps_read_word_data,
> +	},
> +	[1] = {
> +		.pages = 2,
> +		.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
> +			PMBUS_HAVE_PIN | PMBUS_HAVE_FAN12 | PMBUS_HAVE_TEMP |
> +			PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 |
> +			PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT |
> +			PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP |
> +			PMBUS_HAVE_STATUS_FAN12,
> +		.func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
> +			PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 |
> +			PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT,
> +		.read_byte_data = ibm_cffps_read_byte_data,
> +		.read_word_data = ibm_cffps_read_word_data,
> +	},
>  };
>  
>  static struct pmbus_platform_data ibm_cffps_pdata = {
> @@ -346,13 +394,21 @@ static void ibm_cffps_create_led_class(struct ibm_cffps *psu)
>  static int ibm_cffps_probe(struct i2c_client *client,
>  			   const struct i2c_device_id *id)
>  {
> -	int i, rc;
> +	int i, rc, vs;
>  	struct dentry *debugfs;
>  	struct dentry *ibm_cffps_dir;
>  	struct ibm_cffps *psu;
> +	const void *md = of_device_get_match_data(&client->dev);
> +
> +	if (md)
> +		vs = (int)md;
> +	else if (id)
> +		vs = (int)id->driver_data;
> +	else
> +		vs = 1;
>  
>  	client->dev.platform_data = &ibm_cffps_pdata;
> -	rc = pmbus_do_probe(client, id, &ibm_cffps_info);
> +	rc = pmbus_do_probe(client, id, &ibm_cffps_info[vs - 1]);
>  	if (rc)
>  		return rc;
>  
> @@ -364,6 +420,7 @@ static int ibm_cffps_probe(struct i2c_client *client,
>  	if (!psu)
>  		return 0;
>  
> +	psu->version = vs;
>  	psu->client = client;
>  	mutex_init(&psu->input_history.update_lock);
>  	psu->input_history.last_update = jiffies - HZ;
> @@ -406,12 +463,20 @@ static int ibm_cffps_probe(struct i2c_client *client,
>  
>  static const struct i2c_device_id ibm_cffps_id[] = {
>  	{ "ibm_cffps1", 1 },
> +	{ "ibm_cffps2", 2 },
>  	{}
>  };
>  MODULE_DEVICE_TABLE(i2c, ibm_cffps_id);
>  
>  static const struct of_device_id ibm_cffps_of_match[] = {
> -	{ .compatible = "ibm,cffps1" },
> +	{
> +		.compatible = "ibm,cffps1",
> +		.data = (void *)1
> +	},
> +	{
> +		.compatible = "ibm,cffps2",
> +		.data = (void *)2
> +	},
>  	{}
>  };
>  MODULE_DEVICE_TABLE(of, ibm_cffps_of_match);
> -- 
> 1.8.3.1
>
Eddie James Aug. 30, 2019, 6:19 p.m. UTC | #2 
On 8/30/19 12:36 PM, Guenter Roeck wrote:
> On Fri, Aug 30, 2019 at 11:09:45AM -0500, Eddie James wrote:
>> Version 2 of the PSU supports a second page of data and changes the
>> format of the FW version. Use the devicetree binding to differentiate
>> between the version the driver should use.
>>
>> Signed-off-by: Eddie James <eajames@linux.ibm.com>
>> ---
>>   drivers/hwmon/pmbus/ibm-cffps.c | 109 ++++++++++++++++++++++++++++++++--------
>>   1 file changed, 87 insertions(+), 22 deletions(-)
>>
>> diff --git a/drivers/hwmon/pmbus/ibm-cffps.c b/drivers/hwmon/pmbus/ibm-cffps.c
>> index ee2ee9e..ca26fbd 100644
>> --- a/drivers/hwmon/pmbus/ibm-cffps.c
>> +++ b/drivers/hwmon/pmbus/ibm-cffps.c
>> @@ -12,16 +12,20 @@
>>   #include <linux/leds.h>
>>   #include <linux/module.h>
>>   #include <linux/mutex.h>
>> +#include <linux/of_device.h>
>>   #include <linux/pmbus.h>
>>   
>>   #include "pmbus.h"
>>   
>> +#define CFFPS_VERSIONS				2
>> +
> Any chance you can use an enum for the versions ? Using version
> numbers 1/2 combined with array indices 0/1 is confusing, error
> prone, and seems unnecessary.


Sure, good idea.

Thanks,

Eddie


>
> Thanks,
> Guenter
>
>>   #define CFFPS_FRU_CMD				0x9A
>>   #define CFFPS_PN_CMD				0x9B
>>   #define CFFPS_SN_CMD				0x9E
>>   #define CFFPS_CCIN_CMD				0xBD
>> -#define CFFPS_FW_CMD_START			0xFA
>> -#define CFFPS_FW_NUM_BYTES			4
>> +#define CFFPS_FW_CMD				0xFA
>> +#define CFFPS1_FW_NUM_BYTES			4
>> +#define CFFPS2_FW_NUM_WORDS			3
>>   #define CFFPS_SYS_CONFIG_CMD			0xDA
>>   
>>   #define CFFPS_INPUT_HISTORY_CMD			0xD6
>> @@ -61,6 +65,7 @@ struct ibm_cffps_input_history {
>>   };
>>   
>>   struct ibm_cffps {
>> +	int version;
>>   	struct i2c_client *client;
>>   
>>   	struct ibm_cffps_input_history input_history;
>> @@ -132,6 +137,8 @@ static ssize_t ibm_cffps_debugfs_op(struct file *file, char __user *buf,
>>   	struct ibm_cffps *psu = to_psu(idxp, idx);
>>   	char data[I2C_SMBUS_BLOCK_MAX] = { 0 };
>>   
>> +	pmbus_set_page(psu->client, 0);
>> +
>>   	switch (idx) {
>>   	case CFFPS_DEBUGFS_INPUT_HISTORY:
>>   		return ibm_cffps_read_input_history(psu, buf, count, ppos);
>> @@ -152,16 +159,36 @@ static ssize_t ibm_cffps_debugfs_op(struct file *file, char __user *buf,
>>   		rc = snprintf(data, 5, "%04X", rc);
>>   		goto done;
>>   	case CFFPS_DEBUGFS_FW:
>> -		for (i = 0; i < CFFPS_FW_NUM_BYTES; ++i) {
>> -			rc = i2c_smbus_read_byte_data(psu->client,
>> -						      CFFPS_FW_CMD_START + i);
>> -			if (rc < 0)
>> -				return rc;
>> +		switch (psu->version) {
>> +		case 1:
>> +			for (i = 0; i < CFFPS1_FW_NUM_BYTES; ++i) {
>> +				rc = i2c_smbus_read_byte_data(psu->client,
>> +							      CFFPS_FW_CMD +
>> +								i);
>> +				if (rc < 0)
>> +					return rc;
>> +
>> +				snprintf(&data[i * 2], 3, "%02X", rc);
>> +			}
>>   
>> -			snprintf(&data[i * 2], 3, "%02X", rc);
>> -		}
>> +			rc = i * 2;
>> +			break;
>> +		case 2:
>> +			for (i = 0; i < CFFPS2_FW_NUM_WORDS; ++i) {
>> +				rc = i2c_smbus_read_word_data(psu->client,
>> +							      CFFPS_FW_CMD +
>> +								i);
>> +				if (rc < 0)
>> +					return rc;
>> +
>> +				snprintf(&data[i * 4], 5, "%04X", rc);
>> +			}
>>   
>> -		rc = i * 2;
>> +			rc = i * 4;
>> +			break;
>> +		default:
>> +			return -EOPNOTSUPP;
>> +		}
>>   		goto done;
>>   	default:
>>   		return -EINVAL;
>> @@ -279,6 +306,8 @@ static void ibm_cffps_led_brightness_set(struct led_classdev *led_cdev,
>>   			psu->led_state = CFFPS_LED_ON;
>>   	}
>>   
>> +	pmbus_set_page(psu->client, 0);
>> +
>>   	rc = i2c_smbus_write_byte_data(psu->client, CFFPS_SYS_CONFIG_CMD,
>>   				       psu->led_state);
>>   	if (rc < 0)
>> @@ -299,6 +328,8 @@ static int ibm_cffps_led_blink_set(struct led_classdev *led_cdev,
>>   	if (led_cdev->brightness == LED_OFF)
>>   		return 0;
>>   
>> +	pmbus_set_page(psu->client, 0);
>> +
>>   	rc = i2c_smbus_write_byte_data(psu->client, CFFPS_SYS_CONFIG_CMD,
>>   				       CFFPS_LED_BLINK);
>>   	if (rc < 0)
>> @@ -328,15 +359,32 @@ static void ibm_cffps_create_led_class(struct ibm_cffps *psu)
>>   		dev_warn(dev, "failed to register led class: %d\n", rc);
>>   }
>>   
>> -static struct pmbus_driver_info ibm_cffps_info = {
>> -	.pages = 1,
>> -	.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
>> -		PMBUS_HAVE_PIN | PMBUS_HAVE_FAN12 | PMBUS_HAVE_TEMP |
>> -		PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_VOUT |
>> -		PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_INPUT |
>> -		PMBUS_HAVE_STATUS_TEMP | PMBUS_HAVE_STATUS_FAN12,
>> -	.read_byte_data = ibm_cffps_read_byte_data,
>> -	.read_word_data = ibm_cffps_read_word_data,
>> +static struct pmbus_driver_info ibm_cffps_info[CFFPS_VERSIONS] = {
>> +	[0] = {
>> +		.pages = 1,
>> +		.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
>> +			PMBUS_HAVE_PIN | PMBUS_HAVE_FAN12 | PMBUS_HAVE_TEMP |
>> +			PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 |
>> +			PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT |
>> +			PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP |
>> +			PMBUS_HAVE_STATUS_FAN12,
>> +		.read_byte_data = ibm_cffps_read_byte_data,
>> +		.read_word_data = ibm_cffps_read_word_data,
>> +	},
>> +	[1] = {
>> +		.pages = 2,
>> +		.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
>> +			PMBUS_HAVE_PIN | PMBUS_HAVE_FAN12 | PMBUS_HAVE_TEMP |
>> +			PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 |
>> +			PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT |
>> +			PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP |
>> +			PMBUS_HAVE_STATUS_FAN12,
>> +		.func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
>> +			PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 |
>> +			PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT,
>> +		.read_byte_data = ibm_cffps_read_byte_data,
>> +		.read_word_data = ibm_cffps_read_word_data,
>> +	},
>>   };
>>   
>>   static struct pmbus_platform_data ibm_cffps_pdata = {
>> @@ -346,13 +394,21 @@ static void ibm_cffps_create_led_class(struct ibm_cffps *psu)
>>   static int ibm_cffps_probe(struct i2c_client *client,
>>   			   const struct i2c_device_id *id)
>>   {
>> -	int i, rc;
>> +	int i, rc, vs;
>>   	struct dentry *debugfs;
>>   	struct dentry *ibm_cffps_dir;
>>   	struct ibm_cffps *psu;
>> +	const void *md = of_device_get_match_data(&client->dev);
>> +
>> +	if (md)
>> +		vs = (int)md;
>> +	else if (id)
>> +		vs = (int)id->driver_data;
>> +	else
>> +		vs = 1;
>>   
>>   	client->dev.platform_data = &ibm_cffps_pdata;
>> -	rc = pmbus_do_probe(client, id, &ibm_cffps_info);
>> +	rc = pmbus_do_probe(client, id, &ibm_cffps_info[vs - 1]);
>>   	if (rc)
>>   		return rc;
>>   
>> @@ -364,6 +420,7 @@ static int ibm_cffps_probe(struct i2c_client *client,
>>   	if (!psu)
>>   		return 0;
>>   
>> +	psu->version = vs;
>>   	psu->client = client;
>>   	mutex_init(&psu->input_history.update_lock);
>>   	psu->input_history.last_update = jiffies - HZ;
>> @@ -406,12 +463,20 @@ static int ibm_cffps_probe(struct i2c_client *client,
>>   
>>   static const struct i2c_device_id ibm_cffps_id[] = {
>>   	{ "ibm_cffps1", 1 },
>> +	{ "ibm_cffps2", 2 },
>>   	{}
>>   };
>>   MODULE_DEVICE_TABLE(i2c, ibm_cffps_id);
>>   
>>   static const struct of_device_id ibm_cffps_of_match[] = {
>> -	{ .compatible = "ibm,cffps1" },
>> +	{
>> +		.compatible = "ibm,cffps1",
>> +		.data = (void *)1
>> +	},
>> +	{
>> +		.compatible = "ibm,cffps2",
>> +		.data = (void *)2
>> +	},
>>   	{}
>>   };
>>   MODULE_DEVICE_TABLE(of, ibm_cffps_of_match);
>> -- 
>> 1.8.3.1
>>
diff mbox series

Patch

diff --git a/drivers/hwmon/pmbus/ibm-cffps.c b/drivers/hwmon/pmbus/ibm-cffps.c
index ee2ee9e..ca26fbd 100644
--- a/drivers/hwmon/pmbus/ibm-cffps.c
+++ b/drivers/hwmon/pmbus/ibm-cffps.c
@@ -12,16 +12,20 @@ 
 #include <linux/leds.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
+#include <linux/of_device.h>
 #include <linux/pmbus.h>
 
 #include "pmbus.h"
 
+#define CFFPS_VERSIONS				2
+
 #define CFFPS_FRU_CMD				0x9A
 #define CFFPS_PN_CMD				0x9B
 #define CFFPS_SN_CMD				0x9E
 #define CFFPS_CCIN_CMD				0xBD
-#define CFFPS_FW_CMD_START			0xFA
-#define CFFPS_FW_NUM_BYTES			4
+#define CFFPS_FW_CMD				0xFA
+#define CFFPS1_FW_NUM_BYTES			4
+#define CFFPS2_FW_NUM_WORDS			3
 #define CFFPS_SYS_CONFIG_CMD			0xDA
 
 #define CFFPS_INPUT_HISTORY_CMD			0xD6
@@ -61,6 +65,7 @@  struct ibm_cffps_input_history {
 };
 
 struct ibm_cffps {
+	int version;
 	struct i2c_client *client;
 
 	struct ibm_cffps_input_history input_history;
@@ -132,6 +137,8 @@  static ssize_t ibm_cffps_debugfs_op(struct file *file, char __user *buf,
 	struct ibm_cffps *psu = to_psu(idxp, idx);
 	char data[I2C_SMBUS_BLOCK_MAX] = { 0 };
 
+	pmbus_set_page(psu->client, 0);
+
 	switch (idx) {
 	case CFFPS_DEBUGFS_INPUT_HISTORY:
 		return ibm_cffps_read_input_history(psu, buf, count, ppos);
@@ -152,16 +159,36 @@  static ssize_t ibm_cffps_debugfs_op(struct file *file, char __user *buf,
 		rc = snprintf(data, 5, "%04X", rc);
 		goto done;
 	case CFFPS_DEBUGFS_FW:
-		for (i = 0; i < CFFPS_FW_NUM_BYTES; ++i) {
-			rc = i2c_smbus_read_byte_data(psu->client,
-						      CFFPS_FW_CMD_START + i);
-			if (rc < 0)
-				return rc;
+		switch (psu->version) {
+		case 1:
+			for (i = 0; i < CFFPS1_FW_NUM_BYTES; ++i) {
+				rc = i2c_smbus_read_byte_data(psu->client,
+							      CFFPS_FW_CMD +
+								i);
+				if (rc < 0)
+					return rc;
+
+				snprintf(&data[i * 2], 3, "%02X", rc);
+			}
 
-			snprintf(&data[i * 2], 3, "%02X", rc);
-		}
+			rc = i * 2;
+			break;
+		case 2:
+			for (i = 0; i < CFFPS2_FW_NUM_WORDS; ++i) {
+				rc = i2c_smbus_read_word_data(psu->client,
+							      CFFPS_FW_CMD +
+								i);
+				if (rc < 0)
+					return rc;
+
+				snprintf(&data[i * 4], 5, "%04X", rc);
+			}
 
-		rc = i * 2;
+			rc = i * 4;
+			break;
+		default:
+			return -EOPNOTSUPP;
+		}
 		goto done;
 	default:
 		return -EINVAL;
@@ -279,6 +306,8 @@  static void ibm_cffps_led_brightness_set(struct led_classdev *led_cdev,
 			psu->led_state = CFFPS_LED_ON;
 	}
 
+	pmbus_set_page(psu->client, 0);
+
 	rc = i2c_smbus_write_byte_data(psu->client, CFFPS_SYS_CONFIG_CMD,
 				       psu->led_state);
 	if (rc < 0)
@@ -299,6 +328,8 @@  static int ibm_cffps_led_blink_set(struct led_classdev *led_cdev,
 	if (led_cdev->brightness == LED_OFF)
 		return 0;
 
+	pmbus_set_page(psu->client, 0);
+
 	rc = i2c_smbus_write_byte_data(psu->client, CFFPS_SYS_CONFIG_CMD,
 				       CFFPS_LED_BLINK);
 	if (rc < 0)
@@ -328,15 +359,32 @@  static void ibm_cffps_create_led_class(struct ibm_cffps *psu)
 		dev_warn(dev, "failed to register led class: %d\n", rc);
 }
 
-static struct pmbus_driver_info ibm_cffps_info = {
-	.pages = 1,
-	.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
-		PMBUS_HAVE_PIN | PMBUS_HAVE_FAN12 | PMBUS_HAVE_TEMP |
-		PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_VOUT |
-		PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_INPUT |
-		PMBUS_HAVE_STATUS_TEMP | PMBUS_HAVE_STATUS_FAN12,
-	.read_byte_data = ibm_cffps_read_byte_data,
-	.read_word_data = ibm_cffps_read_word_data,
+static struct pmbus_driver_info ibm_cffps_info[CFFPS_VERSIONS] = {
+	[0] = {
+		.pages = 1,
+		.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
+			PMBUS_HAVE_PIN | PMBUS_HAVE_FAN12 | PMBUS_HAVE_TEMP |
+			PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 |
+			PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT |
+			PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP |
+			PMBUS_HAVE_STATUS_FAN12,
+		.read_byte_data = ibm_cffps_read_byte_data,
+		.read_word_data = ibm_cffps_read_word_data,
+	},
+	[1] = {
+		.pages = 2,
+		.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
+			PMBUS_HAVE_PIN | PMBUS_HAVE_FAN12 | PMBUS_HAVE_TEMP |
+			PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 |
+			PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT |
+			PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP |
+			PMBUS_HAVE_STATUS_FAN12,
+		.func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
+			PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 |
+			PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT,
+		.read_byte_data = ibm_cffps_read_byte_data,
+		.read_word_data = ibm_cffps_read_word_data,
+	},
 };
 
 static struct pmbus_platform_data ibm_cffps_pdata = {
@@ -346,13 +394,21 @@  static void ibm_cffps_create_led_class(struct ibm_cffps *psu)
 static int ibm_cffps_probe(struct i2c_client *client,
 			   const struct i2c_device_id *id)
 {
-	int i, rc;
+	int i, rc, vs;
 	struct dentry *debugfs;
 	struct dentry *ibm_cffps_dir;
 	struct ibm_cffps *psu;
+	const void *md = of_device_get_match_data(&client->dev);
+
+	if (md)
+		vs = (int)md;
+	else if (id)
+		vs = (int)id->driver_data;
+	else
+		vs = 1;
 
 	client->dev.platform_data = &ibm_cffps_pdata;
-	rc = pmbus_do_probe(client, id, &ibm_cffps_info);
+	rc = pmbus_do_probe(client, id, &ibm_cffps_info[vs - 1]);
 	if (rc)
 		return rc;
 
@@ -364,6 +420,7 @@  static int ibm_cffps_probe(struct i2c_client *client,
 	if (!psu)
 		return 0;
 
+	psu->version = vs;
 	psu->client = client;
 	mutex_init(&psu->input_history.update_lock);
 	psu->input_history.last_update = jiffies - HZ;
@@ -406,12 +463,20 @@  static int ibm_cffps_probe(struct i2c_client *client,
 
 static const struct i2c_device_id ibm_cffps_id[] = {
 	{ "ibm_cffps1", 1 },
+	{ "ibm_cffps2", 2 },
 	{}
 };
 MODULE_DEVICE_TABLE(i2c, ibm_cffps_id);
 
 static const struct of_device_id ibm_cffps_of_match[] = {
-	{ .compatible = "ibm,cffps1" },
+	{
+		.compatible = "ibm,cffps1",
+		.data = (void *)1
+	},
+	{
+		.compatible = "ibm,cffps2",
+		.data = (void *)2
+	},
 	{}
 };
 MODULE_DEVICE_TABLE(of, ibm_cffps_of_match);