From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Date: Mon, 8 Feb 2016 19:16:49 +0100 (CET) From: Peter Meerwald-Stadler To: Lars-Peter Clausen cc: Jonathan Cameron , Hartmut Knaack , Marc Andre , linux-iio@vger.kernel.org Subject: Re: [PATCH 1/5] iio:ad5064: Structural changes to support LTC2617 In-Reply-To: <1454950910-26049-1-git-send-email-lars@metafoo.de> Message-ID: References: <1454950910-26049-1-git-send-email-lars@metafoo.de> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII List-ID: On Mon, 8 Feb 2016, Lars-Peter Clausen wrote: > From: Marc Andre > > This patch makes minor structural changes to support specifics > for LTC2617 DAC. This DAC requires different handling of the > power down modes. The configuration to actually support the > DAC will be submitted in a secondary patch. > > Adjust the DECLARE_AD5064_CHANNELS() macro to accept a new > ext_info parameter. This allows to use different power down > modes per DAC. (e.g. DAC only support 90kohm to ground) > > Add the chip_info parameter "powerdown_ltc". This parameter is > used in the ad5064_sync_powerdown_mode() function to handle the > power down command for LTC diffently. For those devices the > power down command must be addressed to the channel. > > Signed-off-by: Marc Andre > Signed-off-by: Lars-Peter Clausen > --- > Took the liberty to rebase this onto the latest iio/testing branch > --- > drivers/iio/dac/ad5064.c | 67 +++++++++++++++++++++++++++--------------------- > 1 file changed, 38 insertions(+), 29 deletions(-) > > diff --git a/drivers/iio/dac/ad5064.c b/drivers/iio/dac/ad5064.c > index 81ca008..c55282d 100644 > --- a/drivers/iio/dac/ad5064.c > +++ b/drivers/iio/dac/ad5064.c > @@ -50,10 +50,12 @@ > /** > * struct ad5064_chip_info - chip specific information > * @shared_vref: whether the vref supply is shared between channels > - * @internal_vref: internal reference voltage. 0 if the chip has no internal > - * vref. > + * @internal_vref: internal reference voltage. 0 if the chip has no > + internal vref. > * @channel: channel specification unrelated, but should be channels > * @num_channels: number of channels > + * @powerdown_ltc: Use alternative power down addressing as required by > + * ltc2617 and others. > */ > > struct ad5064_chip_info { > @@ -61,6 +63,7 @@ struct ad5064_chip_info { > unsigned long internal_vref; > const struct iio_chan_spec *channels; > unsigned int num_channels; > + bool powerdown_ltc; > }; > > struct ad5064_state; > @@ -136,15 +139,21 @@ static int ad5064_write(struct ad5064_state *st, unsigned int cmd, > static int ad5064_sync_powerdown_mode(struct ad5064_state *st, > const struct iio_chan_spec *chan) > { > - unsigned int val; > + unsigned int val, address; > int ret; > > - val = (0x1 << chan->address); > + if (st->chip_info->powerdown_ltc) { > + val = 0; > + address = chan->address; > + } else { > + address = 0; > + val = (0x1 << chan->address); > > - if (st->pwr_down[chan->channel]) > - val |= st->pwr_down_mode[chan->channel] << 8; > + if (st->pwr_down[chan->channel]) > + val |= st->pwr_down_mode[chan->channel] << 8; > + } > > - ret = ad5064_write(st, AD5064_CMD_POWERDOWN_DAC, 0, val, 0); > + ret = ad5064_write(st, AD5064_CMD_POWERDOWN_DAC, address, val, 0); > > return ret; > } > @@ -295,7 +304,7 @@ static const struct iio_chan_spec_ext_info ad5064_ext_info[] = { > { }, > }; > > -#define AD5064_CHANNEL(chan, addr, bits, _shift) { \ > +#define AD5064_CHANNEL(chan, addr, bits, _shift, _ext_info) { \ > .type = IIO_VOLTAGE, \ > .indexed = 1, \ > .output = 1, \ > @@ -309,37 +318,37 @@ static const struct iio_chan_spec_ext_info ad5064_ext_info[] = { > .storagebits = 16, \ > .shift = (_shift), \ > }, \ > - .ext_info = ad5064_ext_info, \ > + .ext_info = (_ext_info), \ > } > > -#define DECLARE_AD5064_CHANNELS(name, bits, shift) \ > +#define DECLARE_AD5064_CHANNELS(name, bits, shift, ext_info) \ > const struct iio_chan_spec name[] = { \ > - AD5064_CHANNEL(0, 0, bits, shift), \ > - AD5064_CHANNEL(1, 1, bits, shift), \ > - AD5064_CHANNEL(2, 2, bits, shift), \ > - AD5064_CHANNEL(3, 3, bits, shift), \ > - AD5064_CHANNEL(4, 4, bits, shift), \ > - AD5064_CHANNEL(5, 5, bits, shift), \ > - AD5064_CHANNEL(6, 6, bits, shift), \ > - AD5064_CHANNEL(7, 7, bits, shift), \ > + AD5064_CHANNEL(0, 0, bits, shift, ext_info), \ > + AD5064_CHANNEL(1, 1, bits, shift, ext_info), \ > + AD5064_CHANNEL(2, 2, bits, shift, ext_info), \ > + AD5064_CHANNEL(3, 3, bits, shift, ext_info), \ > + AD5064_CHANNEL(4, 4, bits, shift, ext_info), \ > + AD5064_CHANNEL(5, 5, bits, shift, ext_info), \ > + AD5064_CHANNEL(6, 6, bits, shift, ext_info), \ > + AD5064_CHANNEL(7, 7, bits, shift, ext_info), \ > } > > -#define DECLARE_AD5065_CHANNELS(name, bits, shift) \ > +#define DECLARE_AD5065_CHANNELS(name, bits, shift, ext_info) \ > const struct iio_chan_spec name[] = { \ > - AD5064_CHANNEL(0, 0, bits, shift), \ > - AD5064_CHANNEL(1, 3, bits, shift), \ > + AD5064_CHANNEL(0, 0, bits, shift, ext_info), \ > + AD5064_CHANNEL(1, 3, bits, shift, ext_info), \ > } > > -static DECLARE_AD5064_CHANNELS(ad5024_channels, 12, 8); > -static DECLARE_AD5064_CHANNELS(ad5044_channels, 14, 6); > -static DECLARE_AD5064_CHANNELS(ad5064_channels, 16, 4); > +static DECLARE_AD5064_CHANNELS(ad5024_channels, 12, 8, ad5064_ext_info); > +static DECLARE_AD5064_CHANNELS(ad5044_channels, 14, 6, ad5064_ext_info); > +static DECLARE_AD5064_CHANNELS(ad5064_channels, 16, 4, ad5064_ext_info); > > -static DECLARE_AD5065_CHANNELS(ad5025_channels, 12, 8); > -static DECLARE_AD5065_CHANNELS(ad5045_channels, 14, 6); > -static DECLARE_AD5065_CHANNELS(ad5065_channels, 16, 4); > +static DECLARE_AD5065_CHANNELS(ad5025_channels, 12, 8, ad5064_ext_info); > +static DECLARE_AD5065_CHANNELS(ad5045_channels, 14, 6, ad5064_ext_info); > +static DECLARE_AD5065_CHANNELS(ad5065_channels, 16, 4, ad5064_ext_info); > > -static DECLARE_AD5064_CHANNELS(ad5629_channels, 12, 4); > -static DECLARE_AD5064_CHANNELS(ad5669_channels, 16, 0); > +static DECLARE_AD5064_CHANNELS(ad5629_channels, 12, 4, ad5064_ext_info); > +static DECLARE_AD5064_CHANNELS(ad5669_channels, 16, 0, ad5064_ext_info); > > static const struct ad5064_chip_info ad5064_chip_info_tbl[] = { > [ID_AD5024] = { > -- Peter Meerwald-Stadler +43-664-2444418 (mobile)