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iio:ad5064: Add support for ltc2633 and similar devices

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The Linear Technology LTC2631, LTC2633 and LTC2635 are very similar
to the AD5064 device, in particular the LTC2627.

This patch adds support for those devices. Only the LTC2633 has been
tested, which is the 2-channel variant. The LTC2631 is the 1-channel,
and the LTC2635 the 4-channel version. The actual DAC resolution depends
on the exact chip type and can be 12, 10 or 8 bits, using the upper bits
so this has no effect on the register map. The internal reference is set
to 2.5V on "L" versions, and it's 4.096V for "H" versions.

Datasheets:
    LTC2631: http://www.linear.com/docs/26553
    LTC2633: http://www.linear.com/docs/39529
    LTC2635: http://www.linear.com/docs/28754

Signed-off-by: Mike Looijmans <mike.looijmans@topic.nl>
Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Mike Looijmans 2017-05-08 09:26:24 +02:00 committed by Jonathan Cameron
parent e7215fe4d5
commit b2d2d2bfca
2 changed files with 71 additions and 3 deletions
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3
drivers/iio/dac/Kconfig
View file

@ -13,7 +13,8 @@ config AD5064
AD5045, AD5064, AD5064-1, AD5065, AD5625, AD5625R, AD5627, AD5627R,
AD5628, AD5629R, AD5645R, AD5647R, AD5648, AD5665, AD5665R, AD5666,
AD5667, AD5667R, AD5668, AD5669R, LTC2606, LTC2607, LTC2609, LTC2616,
LTC2617, LTC2619, LTC2626, LTC2627, LTC2629 Digital to Analog Converter.
LTC2617, LTC2619, LTC2626, LTC2627, LTC2629, LTC2631, LTC2633, LTC2635
Digital to Analog Converter.
To compile this driver as a module, choose M here: the
module will be called ad5064.

71
drivers/iio/dac/ad5064.c
View file

@ -2,8 +2,8 @@
* AD5024, AD5025, AD5044, AD5045, AD5064, AD5064-1, AD5065, AD5625, AD5625R,
* AD5627, AD5627R, AD5628, AD5629R, AD5645R, AD5647R, AD5648, AD5665, AD5665R,
* AD5666, AD5667, AD5667R, AD5668, AD5669R, LTC2606, LTC2607, LTC2609, LTC2616,
* LTC2617, LTC2619, LTC2626, LTC2627, LTC2629 Digital to analog converters
* driver
* LTC2617, LTC2619, LTC2626, LTC2627, LTC2629, LTC2631, LTC2633, LTC2635
* Digital to analog converters driver
*
* Copyright 2011 Analog Devices Inc.
*
@ -168,6 +168,24 @@ enum ad5064_type {
ID_LTC2626,
ID_LTC2627,
ID_LTC2629,
ID_LTC2631_L12,
ID_LTC2631_H12,
ID_LTC2631_L10,
ID_LTC2631_H10,
ID_LTC2631_L8,
ID_LTC2631_H8,
ID_LTC2633_L12,
ID_LTC2633_H12,
ID_LTC2633_L10,
ID_LTC2633_H10,
ID_LTC2633_L8,
ID_LTC2633_H8,
ID_LTC2635_L12,
ID_LTC2635_H12,
ID_LTC2635_L10,
ID_LTC2635_H10,
ID_LTC2635_L8,
ID_LTC2635_H8,
};
static int ad5064_write(struct ad5064_state *st, unsigned int cmd,
@ -425,6 +443,19 @@ static DECLARE_AD5064_CHANNELS(ad5669_channels, 16, 0, ad5064_ext_info);
static DECLARE_AD5064_CHANNELS(ltc2607_channels, 16, 0, ltc2617_ext_info);
static DECLARE_AD5064_CHANNELS(ltc2617_channels, 14, 2, ltc2617_ext_info);
static DECLARE_AD5064_CHANNELS(ltc2627_channels, 12, 4, ltc2617_ext_info);
#define ltc2631_12_channels ltc2627_channels
static DECLARE_AD5064_CHANNELS(ltc2631_10_channels, 10, 6, ltc2617_ext_info);
static DECLARE_AD5064_CHANNELS(ltc2631_8_channels, 8, 8, ltc2617_ext_info);
#define LTC2631_INFO(vref, pchannels, nchannels) \
{ \
.shared_vref = true, \
.internal_vref = vref, \
.channels = pchannels, \
.num_channels = nchannels, \
.regmap_type = AD5064_REGMAP_LTC, \
}
static const struct ad5064_chip_info ad5064_chip_info_tbl[] = {
[ID_AD5024] = {
@ -724,6 +755,24 @@ static const struct ad5064_chip_info ad5064_chip_info_tbl[] = {
.num_channels = 4,
.regmap_type = AD5064_REGMAP_LTC,
},
[ID_LTC2631_L12] = LTC2631_INFO(2500000, ltc2631_12_channels, 1),
[ID_LTC2631_H12] = LTC2631_INFO(4096000, ltc2631_12_channels, 1),
[ID_LTC2631_L10] = LTC2631_INFO(2500000, ltc2631_10_channels, 1),
[ID_LTC2631_H10] = LTC2631_INFO(4096000, ltc2631_10_channels, 1),
[ID_LTC2631_L8] = LTC2631_INFO(2500000, ltc2631_8_channels, 1),
[ID_LTC2631_H8] = LTC2631_INFO(4096000, ltc2631_8_channels, 1),
[ID_LTC2633_L12] = LTC2631_INFO(2500000, ltc2631_12_channels, 2),
[ID_LTC2633_H12] = LTC2631_INFO(4096000, ltc2631_12_channels, 2),
[ID_LTC2633_L10] = LTC2631_INFO(2500000, ltc2631_10_channels, 2),
[ID_LTC2633_H10] = LTC2631_INFO(4096000, ltc2631_10_channels, 2),
[ID_LTC2633_L8] = LTC2631_INFO(2500000, ltc2631_8_channels, 2),
[ID_LTC2633_H8] = LTC2631_INFO(4096000, ltc2631_8_channels, 2),
[ID_LTC2635_L12] = LTC2631_INFO(2500000, ltc2631_12_channels, 4),
[ID_LTC2635_H12] = LTC2631_INFO(4096000, ltc2631_12_channels, 4),
[ID_LTC2635_L10] = LTC2631_INFO(2500000, ltc2631_10_channels, 4),
[ID_LTC2635_H10] = LTC2631_INFO(4096000, ltc2631_10_channels, 4),
[ID_LTC2635_L8] = LTC2631_INFO(2500000, ltc2631_8_channels, 4),
[ID_LTC2635_H8] = LTC2631_INFO(4096000, ltc2631_8_channels, 4),
};
static inline unsigned int ad5064_num_vref(struct ad5064_state *st)
@ -982,6 +1031,24 @@ static const struct i2c_device_id ad5064_i2c_ids[] = {
{"ltc2626", ID_LTC2626},
{"ltc2627", ID_LTC2627},
{"ltc2629", ID_LTC2629},
{"ltc2631-l12", ID_LTC2631_L12},
{"ltc2631-h12", ID_LTC2631_H12},
{"ltc2631-l10", ID_LTC2631_L10},
{"ltc2631-h10", ID_LTC2631_H10},
{"ltc2631-l8", ID_LTC2631_L8},
{"ltc2631-h8", ID_LTC2631_H8},
{"ltc2633-l12", ID_LTC2633_L12},
{"ltc2633-h12", ID_LTC2633_H12},
{"ltc2633-l10", ID_LTC2633_L10},
{"ltc2633-h10", ID_LTC2633_H10},
{"ltc2633-l8", ID_LTC2633_L8},
{"ltc2633-h8", ID_LTC2633_H8},
{"ltc2635-l12", ID_LTC2635_L12},
{"ltc2635-h12", ID_LTC2635_H12},
{"ltc2635-l10", ID_LTC2635_L10},
{"ltc2635-h10", ID_LTC2635_H10},
{"ltc2635-l8", ID_LTC2635_L8},
{"ltc2635-h8", ID_LTC2635_H8},
{}
};
MODULE_DEVICE_TABLE(i2c, ad5064_i2c_ids);