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

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