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hwmon: (pmbus) Add virtual page config bit

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Some circumstances call for virtual pages, to expose multiple values
packed into an extended PMBus register in a manner non-compliant with
the PMBus standard. An example of this is the Maxim MAX31785 controller,
which extends the READ_FAN_SPEED_1 PMBus register from two to four bytes
to support tach readings for both rotors of a dual rotor fan. This extended
register contains two word-sized values, one reporting the rate of the
fastest rotor, the other the rate of the slowest. The concept of virtual
pages aids this situation by mapping the page number onto the value to be
selected from the vectored result.

We should not try to set virtual pages on the device as such a page
explicitly doesn't exist; add a flag so we can avoid doing so.

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Andrew Jeffery 2017-11-20 15:12:05 +10:30 committed by Guenter Roeck
parent 56ad86b4b1
commit 464df6fa37
2 changed files with 20 additions and 9 deletions
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2
drivers/hwmon/pmbus/pmbus.h
View File

@ -372,6 +372,8 @@ enum pmbus_sensor_classes {
#define PMBUS_HAVE_PWM12 BIT(20)
#define PMBUS_HAVE_PWM34 BIT(21)
#define PMBUS_PAGE_VIRTUAL BIT(31)
enum pmbus_data_format { linear = 0, direct, vid };
enum vrm_version { vr11 = 0, vr12, vr13 };

27
drivers/hwmon/pmbus/pmbus_core.c
View File

@ -162,18 +162,27 @@ EXPORT_SYMBOL_GPL(pmbus_clear_cache);
int pmbus_set_page(struct i2c_client *client, int page)
{
struct pmbus_data *data = i2c_get_clientdata(client);
int rv = 0;
int newpage;
int rv;
if (page >= 0 && page != data->currpage) {
if (page < 0 || page == data->currpage)
return 0;
if (!(data->info->func[page] & PMBUS_PAGE_VIRTUAL)) {
rv = i2c_smbus_write_byte_data(client, PMBUS_PAGE, page);
newpage = i2c_smbus_read_byte_data(client, PMBUS_PAGE);
if (newpage != page)
rv = -EIO;
else
data->currpage = page;
if (rv < 0)
return rv;
rv = i2c_smbus_read_byte_data(client, PMBUS_PAGE);
if (rv < 0)
return rv;
if (rv != page)
return -EIO;
}
return rv;
data->currpage = page;
return 0;
}
EXPORT_SYMBOL_GPL(pmbus_set_page);