Messages in this thread | | | Date | Wed, 01 Oct 2014 21:05:49 -0700 | From | Guenter Roeck <> | Subject | Re: [PATCH v4 2/4] pmbus: core: add helpers for byte write and read modify write |
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On 10/01/2014 12:05 PM, atull@opensource.altera.com wrote: > From: Alan Tull <atull@opensource.altera.com> > > Add two helper functions: > * pmbus_write_byte_data = paged byte write > * pmbus_update_byte_data = paged byte read/modify/write > > Signed-off-by: Alan Tull <atull@opensource.altera.com> > --- > drivers/hwmon/pmbus/pmbus_core.c | 31 +++++++++++++++++++++++++++++++ > 1 file changed, 31 insertions(+) > > diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c > index 291d11f..d6c3701 100644 > --- a/drivers/hwmon/pmbus/pmbus_core.c > +++ b/drivers/hwmon/pmbus/pmbus_core.c > @@ -253,6 +253,37 @@ int pmbus_read_byte_data(struct i2c_client *client, int page, u8 reg) > } > EXPORT_SYMBOL_GPL(pmbus_read_byte_data); > > +int pmbus_write_byte_data(struct i2c_client *client, int page, u8 reg, u8 value) > +{ > + int rv; > + > + rv = pmbus_set_page(client, page); > + if (rv < 0) > + return rv; > + > + return i2c_smbus_write_byte_data(client, reg, value); > +} > +EXPORT_SYMBOL_GPL(pmbus_write_byte_data); > + > +int pmbus_update_byte_data(struct i2c_client *client, int page, u8 reg, > + u8 mask, u8 value) > +{ > + unsigned int tmp; > + int rv; > + > + rv = pmbus_read_byte_data(client, page, reg); > + if (rv < 0) > + return rv; > + > + tmp = (rv & ~mask) | (value & mask); > + > + if (tmp != rv) > + rv = pmbus_write_byte_data(client, page, reg, tmp); > + > + return rv; > +} > +EXPORT_SYMBOL_GPL(pmbus_update_byte_data); > + > /* > * _pmbus_read_byte_data() is similar to pmbus_read_byte_data(), but checks if > * a device specific mapping function exists and calls it if necessary. >
Results in:
drivers/hwmon/pmbus/pmbus_core.c:259:5: warning: symbol 'pmbus_write_byte_data' was not declared. Should it be static? drivers/hwmon/pmbus/pmbus_core.c:271:5: warning: symbol 'pmbus_update_byte_data' was not declared. Should it be static? drivers/hwmon/pmbus/pmbus_core.c:259:5: warning: no previous prototype for 'pmbus_write_byte_data' [-Wmissing-prototypes] drivers/hwmon/pmbus/pmbus_core.c:271:5: warning: no previous prototype for 'pmbus_update_byte_data' [-Wmissing-prototypes]
No need to resubmit. I added a patch to un-export the functions and merged patch 2 and 3 together in order to avoid a warning after patch 2. We can always export the new helper functions later if needed.
Guenter
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