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iio: dac: ltc2664: Add driver for LTC2664 and LTC2672
LTC2664 4 channel, 12-/16-Bit Voltage Output SoftSpan DAC LTC2672 5 channel, 12-/16-Bit Current Output Softspan DAC Reviewed-by: Nuno Sa <nuno.sa@analog.com> Co-developed-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Kim Seer Paller <kimseer.paller@analog.com> Reviewed-by: Conor Dooley <conor.dooley@microchip.com> Link: https://patch.msgid.link/20240718051834.32270-7-kimseer.paller@analog.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Kim Seer Paller
Jonathan Cameron
parent
dd554d1a72
commit
4cc2fc445d
@ -13281,6 +13281,7 @@ S: Supported
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W: https://ez.analog.com/linux-software-drivers
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F: Documentation/devicetree/bindings/iio/dac/adi,ltc2664.yaml
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F: Documentation/devicetree/bindings/iio/dac/adi,ltc2672.yaml
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F: drivers/iio/dac/ltc2664.c
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LTC2688 IIO DAC DRIVER
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M: Nuno Sá <nuno.sa@analog.com>
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@ -371,6 +371,17 @@ config LTC2632
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To compile this driver as a module, choose M here: the
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module will be called ltc2632.
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config LTC2664
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tristate "Analog Devices LTC2664 and LTC2672 DAC SPI driver"
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depends on SPI
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select REGMAP
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help
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Say yes here to build support for Analog Devices
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LTC2664 and LTC2672 converters (DAC).
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To compile this driver as a module, choose M here: the
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module will be called ltc2664.
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config M62332
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tristate "Mitsubishi M62332 DAC driver"
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depends on I2C
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@ -37,6 +37,7 @@ obj-$(CONFIG_DS4424) += ds4424.o
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obj-$(CONFIG_LPC18XX_DAC) += lpc18xx_dac.o
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obj-$(CONFIG_LTC1660) += ltc1660.o
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obj-$(CONFIG_LTC2632) += ltc2632.o
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obj-$(CONFIG_LTC2664) += ltc2664.o
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obj-$(CONFIG_LTC2688) += ltc2688.o
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obj-$(CONFIG_M62332) += m62332.o
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obj-$(CONFIG_MAX517) += max517.o
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735
drivers/iio/dac/ltc2664.c
Normal file
735
drivers/iio/dac/ltc2664.c
Normal file
@ -0,0 +1,735 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* LTC2664 4 channel, 12-/16-Bit Voltage Output SoftSpan DAC driver
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* LTC2672 5 channel, 12-/16-Bit Current Output Softspan DAC driver
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*
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* Copyright 2024 Analog Devices Inc.
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*/
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#include <linux/bitfield.h>
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#include <linux/cleanup.h>
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#include <linux/device.h>
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#include <linux/gpio/consumer.h>
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#include <linux/iio/iio.h>
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#include <linux/kernel.h>
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#include <linux/math64.h>
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#include <linux/module.h>
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#include <linux/mod_devicetable.h>
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#include <linux/mutex.h>
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#include <linux/property.h>
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#include <linux/regmap.h>
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#include <linux/regulator/consumer.h>
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#include <linux/spi/spi.h>
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#define LTC2664_CMD_WRITE_N(n) (0x00 + (n))
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#define LTC2664_CMD_UPDATE_N(n) (0x10 + (n))
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#define LTC2664_CMD_WRITE_N_UPDATE_ALL 0x20
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#define LTC2664_CMD_WRITE_N_UPDATE_N(n) (0x30 + (n))
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#define LTC2664_CMD_POWER_DOWN_N(n) (0x40 + (n))
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#define LTC2664_CMD_POWER_DOWN_ALL 0x50
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#define LTC2664_CMD_SPAN_N(n) (0x60 + (n))
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#define LTC2664_CMD_CONFIG 0x70
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#define LTC2664_CMD_MUX 0xB0
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#define LTC2664_CMD_TOGGLE_SEL 0xC0
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#define LTC2664_CMD_GLOBAL_TOGGLE 0xD0
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#define LTC2664_CMD_NO_OPERATION 0xF0
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#define LTC2664_REF_DISABLE 0x0001
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#define LTC2664_MSPAN_SOFTSPAN 7
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#define LTC2672_MAX_CHANNEL 5
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#define LTC2672_MAX_SPAN 7
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#define LTC2672_SCALE_MULTIPLIER(n) (50 * BIT(n))
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enum {
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LTC2664_SPAN_RANGE_0V_5V,
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LTC2664_SPAN_RANGE_0V_10V,
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LTC2664_SPAN_RANGE_M5V_5V,
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LTC2664_SPAN_RANGE_M10V_10V,
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LTC2664_SPAN_RANGE_M2V5_2V5,
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};
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enum {
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LTC2664_INPUT_A,
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LTC2664_INPUT_B,
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LTC2664_INPUT_B_AVAIL,
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LTC2664_POWERDOWN,
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LTC2664_POWERDOWN_MODE,
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LTC2664_TOGGLE_EN,
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LTC2664_GLOBAL_TOGGLE,
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};
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static const u16 ltc2664_mspan_lut[8][2] = {
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{ LTC2664_SPAN_RANGE_M10V_10V, 32768 }, /* MPS2=0, MPS1=0, MSP0=0 (0)*/
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{ LTC2664_SPAN_RANGE_M5V_5V, 32768 }, /* MPS2=0, MPS1=0, MSP0=1 (1)*/
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{ LTC2664_SPAN_RANGE_M2V5_2V5, 32768 }, /* MPS2=0, MPS1=1, MSP0=0 (2)*/
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{ LTC2664_SPAN_RANGE_0V_10V, 0 }, /* MPS2=0, MPS1=1, MSP0=1 (3)*/
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{ LTC2664_SPAN_RANGE_0V_10V, 32768 }, /* MPS2=1, MPS1=0, MSP0=0 (4)*/
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{ LTC2664_SPAN_RANGE_0V_5V, 0 }, /* MPS2=1, MPS1=0, MSP0=1 (5)*/
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{ LTC2664_SPAN_RANGE_0V_5V, 32768 }, /* MPS2=1, MPS1=1, MSP0=0 (6)*/
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{ LTC2664_SPAN_RANGE_0V_5V, 0 } /* MPS2=1, MPS1=1, MSP0=1 (7)*/
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};
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struct ltc2664_state;
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struct ltc2664_chip_info {
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const char *name;
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int (*scale_get)(const struct ltc2664_state *st, int c);
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int (*offset_get)(const struct ltc2664_state *st, int c);
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int measurement_type;
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unsigned int num_channels;
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const int (*span_helper)[2];
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unsigned int num_span;
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unsigned int internal_vref_mv;
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bool manual_span_support;
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bool rfsadj_support;
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};
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struct ltc2664_chan {
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/* indicates if the channel should be toggled */
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bool toggle_chan;
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/* indicates if the channel is in powered down state */
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bool powerdown;
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/* span code of the channel */
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u8 span;
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/* raw data of the current state of the chip registers (A/B) */
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u16 raw[2];
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};
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struct ltc2664_state {
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struct spi_device *spi;
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struct regmap *regmap;
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struct ltc2664_chan channels[LTC2672_MAX_CHANNEL];
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/* lock to protect against multiple access to the device and shared data */
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struct mutex lock;
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const struct ltc2664_chip_info *chip_info;
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struct iio_chan_spec *iio_channels;
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int vref_mv;
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u32 rfsadj_ohms;
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u32 toggle_sel;
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bool global_toggle;
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};
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static const int ltc2664_span_helper[][2] = {
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{ 0, 5000 },
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{ 0, 10000 },
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{ -5000, 5000 },
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{ -10000, 10000 },
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{ -2500, 2500 },
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};
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static const int ltc2672_span_helper[][2] = {
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{ 0, 0 },
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{ 0, 3125 },
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{ 0, 6250 },
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{ 0, 12500 },
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{ 0, 25000 },
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{ 0, 50000 },
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{ 0, 100000 },
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{ 0, 200000 },
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{ 0, 300000 },
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};
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static int ltc2664_scale_get(const struct ltc2664_state *st, int c)
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{
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const struct ltc2664_chan *chan = &st->channels[c];
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const int (*span_helper)[2] = st->chip_info->span_helper;
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int span, fs;
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span = chan->span;
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if (span < 0)
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return span;
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fs = span_helper[span][1] - span_helper[span][0];
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return fs * st->vref_mv / 2500;
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}
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static int ltc2672_scale_get(const struct ltc2664_state *st, int c)
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{
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const struct ltc2664_chan *chan = &st->channels[c];
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int span, fs;
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span = chan->span - 1;
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if (span < 0)
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return span;
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fs = 1000 * st->vref_mv;
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if (span == LTC2672_MAX_SPAN)
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return mul_u64_u32_div(4800, fs, st->rfsadj_ohms);
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return mul_u64_u32_div(LTC2672_SCALE_MULTIPLIER(span), fs, st->rfsadj_ohms);
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}
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static int ltc2664_offset_get(const struct ltc2664_state *st, int c)
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{
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const struct ltc2664_chan *chan = &st->channels[c];
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int span;
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span = chan->span;
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if (span < 0)
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return span;
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if (st->chip_info->span_helper[span][0] < 0)
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return -32768;
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return 0;
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}
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static int ltc2664_dac_code_write(struct ltc2664_state *st, u32 chan, u32 input,
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u16 code)
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{
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struct ltc2664_chan *c = &st->channels[chan];
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int ret, reg;
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guard(mutex)(&st->lock);
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/* select the correct input register to write to */
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if (c->toggle_chan) {
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ret = regmap_write(st->regmap, LTC2664_CMD_TOGGLE_SEL,
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input << chan);
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if (ret)
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return ret;
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}
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/*
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* If in toggle mode the dac should be updated by an
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* external signal (or sw toggle) and not here.
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*/
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if (st->toggle_sel & BIT(chan))
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reg = LTC2664_CMD_WRITE_N(chan);
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else
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reg = LTC2664_CMD_WRITE_N_UPDATE_N(chan);
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ret = regmap_write(st->regmap, reg, code);
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if (ret)
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return ret;
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c->raw[input] = code;
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if (c->toggle_chan) {
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ret = regmap_write(st->regmap, LTC2664_CMD_TOGGLE_SEL,
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st->toggle_sel);
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if (ret)
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return ret;
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}
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return 0;
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}
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static void ltc2664_dac_code_read(struct ltc2664_state *st, u32 chan, u32 input,
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u32 *code)
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{
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guard(mutex)(&st->lock);
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*code = st->channels[chan].raw[input];
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}
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static const int ltc2664_raw_range[] = { 0, 1, U16_MAX };
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static int ltc2664_read_avail(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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const int **vals, int *type, int *length,
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long info)
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{
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switch (info) {
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case IIO_CHAN_INFO_RAW:
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*vals = ltc2664_raw_range;
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*type = IIO_VAL_INT;
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return IIO_AVAIL_RANGE;
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default:
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return -EINVAL;
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}
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}
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static int ltc2664_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan, int *val,
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int *val2, long info)
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{
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struct ltc2664_state *st = iio_priv(indio_dev);
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switch (info) {
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case IIO_CHAN_INFO_RAW:
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ltc2664_dac_code_read(st, chan->channel, LTC2664_INPUT_A, val);
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_OFFSET:
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*val = st->chip_info->offset_get(st, chan->channel);
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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*val = st->chip_info->scale_get(st, chan->channel);
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*val2 = 16;
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return IIO_VAL_FRACTIONAL_LOG2;
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default:
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return -EINVAL;
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}
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}
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static int ltc2664_write_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan, int val,
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int val2, long info)
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{
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struct ltc2664_state *st = iio_priv(indio_dev);
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switch (info) {
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case IIO_CHAN_INFO_RAW:
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if (val > U16_MAX || val < 0)
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return -EINVAL;
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return ltc2664_dac_code_write(st, chan->channel,
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LTC2664_INPUT_A, val);
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default:
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return -EINVAL;
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}
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}
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static ssize_t ltc2664_reg_bool_get(struct iio_dev *indio_dev,
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uintptr_t private,
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const struct iio_chan_spec *chan,
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char *buf)
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{
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struct ltc2664_state *st = iio_priv(indio_dev);
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u32 val;
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guard(mutex)(&st->lock);
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switch (private) {
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case LTC2664_POWERDOWN:
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val = st->channels[chan->channel].powerdown;
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return sysfs_emit(buf, "%u\n", val);
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case LTC2664_POWERDOWN_MODE:
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return sysfs_emit(buf, "42kohm_to_gnd\n");
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case LTC2664_TOGGLE_EN:
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val = !!(st->toggle_sel & BIT(chan->channel));
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return sysfs_emit(buf, "%u\n", val);
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case LTC2664_GLOBAL_TOGGLE:
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val = st->global_toggle;
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return sysfs_emit(buf, "%u\n", val);
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default:
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return -EINVAL;
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}
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}
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static ssize_t ltc2664_reg_bool_set(struct iio_dev *indio_dev,
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uintptr_t private,
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const struct iio_chan_spec *chan,
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const char *buf, size_t len)
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{
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struct ltc2664_state *st = iio_priv(indio_dev);
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int ret;
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bool en;
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ret = kstrtobool(buf, &en);
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if (ret)
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return ret;
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guard(mutex)(&st->lock);
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switch (private) {
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case LTC2664_POWERDOWN:
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ret = regmap_write(st->regmap,
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en ? LTC2664_CMD_POWER_DOWN_N(chan->channel) :
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LTC2664_CMD_UPDATE_N(chan->channel), en);
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if (ret)
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return ret;
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st->channels[chan->channel].powerdown = en;
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return len;
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case LTC2664_TOGGLE_EN:
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if (en)
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st->toggle_sel |= BIT(chan->channel);
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else
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st->toggle_sel &= ~BIT(chan->channel);
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ret = regmap_write(st->regmap, LTC2664_CMD_TOGGLE_SEL,
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st->toggle_sel);
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if (ret)
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return ret;
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return len;
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case LTC2664_GLOBAL_TOGGLE:
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ret = regmap_write(st->regmap, LTC2664_CMD_GLOBAL_TOGGLE, en);
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if (ret)
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return ret;
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st->global_toggle = en;
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return len;
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default:
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return -EINVAL;
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}
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}
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static ssize_t ltc2664_dac_input_read(struct iio_dev *indio_dev,
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uintptr_t private,
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const struct iio_chan_spec *chan,
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char *buf)
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{
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struct ltc2664_state *st = iio_priv(indio_dev);
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u32 val;
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if (private == LTC2664_INPUT_B_AVAIL)
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return sysfs_emit(buf, "[%u %u %u]\n", ltc2664_raw_range[0],
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ltc2664_raw_range[1],
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ltc2664_raw_range[2] / 4);
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ltc2664_dac_code_read(st, chan->channel, private, &val);
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return sysfs_emit(buf, "%u\n", val);
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}
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static ssize_t ltc2664_dac_input_write(struct iio_dev *indio_dev,
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uintptr_t private,
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const struct iio_chan_spec *chan,
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const char *buf, size_t len)
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{
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struct ltc2664_state *st = iio_priv(indio_dev);
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int ret;
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u16 val;
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if (private == LTC2664_INPUT_B_AVAIL)
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return -EINVAL;
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ret = kstrtou16(buf, 10, &val);
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if (ret)
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return ret;
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ret = ltc2664_dac_code_write(st, chan->channel, private, val);
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if (ret)
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return ret;
|
||||
|
||||
return len;
|
||||
}
|
||||
|
||||
static int ltc2664_reg_access(struct iio_dev *indio_dev,
|
||||
unsigned int reg,
|
||||
unsigned int writeval,
|
||||
unsigned int *readval)
|
||||
{
|
||||
struct ltc2664_state *st = iio_priv(indio_dev);
|
||||
|
||||
if (readval)
|
||||
return -EOPNOTSUPP;
|
||||
|
||||
return regmap_write(st->regmap, reg, writeval);
|
||||
}
|
||||
|
||||
#define LTC2664_CHAN_EXT_INFO(_name, _what, _shared, _read, _write) { \
|
||||
.name = _name, \
|
||||
.read = (_read), \
|
||||
.write = (_write), \
|
||||
.private = (_what), \
|
||||
.shared = (_shared), \
|
||||
}
|
||||
|
||||
/*
|
||||
* For toggle mode we only expose the symbol attr (sw_toggle) in case a TGPx is
|
||||
* not provided in dts.
|
||||
*/
|
||||
static const struct iio_chan_spec_ext_info ltc2664_toggle_sym_ext_info[] = {
|
||||
LTC2664_CHAN_EXT_INFO("raw0", LTC2664_INPUT_A, IIO_SEPARATE,
|
||||
ltc2664_dac_input_read, ltc2664_dac_input_write),
|
||||
LTC2664_CHAN_EXT_INFO("raw1", LTC2664_INPUT_B, IIO_SEPARATE,
|
||||
ltc2664_dac_input_read, ltc2664_dac_input_write),
|
||||
LTC2664_CHAN_EXT_INFO("powerdown", LTC2664_POWERDOWN, IIO_SEPARATE,
|
||||
ltc2664_reg_bool_get, ltc2664_reg_bool_set),
|
||||
LTC2664_CHAN_EXT_INFO("powerdown_mode", LTC2664_POWERDOWN_MODE,
|
||||
IIO_SEPARATE, ltc2664_reg_bool_get, NULL),
|
||||
LTC2664_CHAN_EXT_INFO("symbol", LTC2664_GLOBAL_TOGGLE, IIO_SEPARATE,
|
||||
ltc2664_reg_bool_get, ltc2664_reg_bool_set),
|
||||
LTC2664_CHAN_EXT_INFO("toggle_en", LTC2664_TOGGLE_EN,
|
||||
IIO_SEPARATE, ltc2664_reg_bool_get,
|
||||
ltc2664_reg_bool_set),
|
||||
{ }
|
||||
};
|
||||
|
||||
static const struct iio_chan_spec_ext_info ltc2664_ext_info[] = {
|
||||
LTC2664_CHAN_EXT_INFO("powerdown", LTC2664_POWERDOWN, IIO_SEPARATE,
|
||||
ltc2664_reg_bool_get, ltc2664_reg_bool_set),
|
||||
LTC2664_CHAN_EXT_INFO("powerdown_mode", LTC2664_POWERDOWN_MODE,
|
||||
IIO_SEPARATE, ltc2664_reg_bool_get, NULL),
|
||||
{ }
|
||||
};
|
||||
|
||||
static const struct iio_chan_spec ltc2664_channel_template = {
|
||||
.indexed = 1,
|
||||
.output = 1,
|
||||
.info_mask_separate = BIT(IIO_CHAN_INFO_SCALE) |
|
||||
BIT(IIO_CHAN_INFO_OFFSET) |
|
||||
BIT(IIO_CHAN_INFO_RAW),
|
||||
.info_mask_separate_available = BIT(IIO_CHAN_INFO_RAW),
|
||||
.ext_info = ltc2664_ext_info,
|
||||
};
|
||||
|
||||
static const struct ltc2664_chip_info ltc2664_chip = {
|
||||
.name = "ltc2664",
|
||||
.scale_get = ltc2664_scale_get,
|
||||
.offset_get = ltc2664_offset_get,
|
||||
.measurement_type = IIO_VOLTAGE,
|
||||
.num_channels = 4,
|
||||
.span_helper = ltc2664_span_helper,
|
||||
.num_span = ARRAY_SIZE(ltc2664_span_helper),
|
||||
.internal_vref_mv = 2500,
|
||||
.manual_span_support = true,
|
||||
.rfsadj_support = false,
|
||||
};
|
||||
|
||||
static const struct ltc2664_chip_info ltc2672_chip = {
|
||||
.name = "ltc2672",
|
||||
.scale_get = ltc2672_scale_get,
|
||||
.offset_get = ltc2664_offset_get,
|
||||
.measurement_type = IIO_CURRENT,
|
||||
.num_channels = 5,
|
||||
.span_helper = ltc2672_span_helper,
|
||||
.num_span = ARRAY_SIZE(ltc2672_span_helper),
|
||||
.internal_vref_mv = 1250,
|
||||
.manual_span_support = false,
|
||||
.rfsadj_support = true,
|
||||
};
|
||||
|
||||
static int ltc2664_set_span(const struct ltc2664_state *st, int min, int max,
|
||||
int chan)
|
||||
{
|
||||
const struct ltc2664_chip_info *chip_info = st->chip_info;
|
||||
const int (*span_helper)[2] = chip_info->span_helper;
|
||||
int span, ret;
|
||||
|
||||
for (span = 0; span < chip_info->num_span; span++) {
|
||||
if (min == span_helper[span][0] && max == span_helper[span][1])
|
||||
break;
|
||||
}
|
||||
|
||||
if (span == chip_info->num_span)
|
||||
return -EINVAL;
|
||||
|
||||
ret = regmap_write(st->regmap, LTC2664_CMD_SPAN_N(chan), span);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
return span;
|
||||
}
|
||||
|
||||
static int ltc2664_channel_config(struct ltc2664_state *st)
|
||||
{
|
||||
const struct ltc2664_chip_info *chip_info = st->chip_info;
|
||||
struct device *dev = &st->spi->dev;
|
||||
u32 reg, tmp[2], mspan;
|
||||
int ret, span = 0;
|
||||
|
||||
mspan = LTC2664_MSPAN_SOFTSPAN;
|
||||
ret = device_property_read_u32(dev, "adi,manual-span-operation-config",
|
||||
&mspan);
|
||||
if (!ret) {
|
||||
if (!chip_info->manual_span_support)
|
||||
return dev_err_probe(dev, -EINVAL,
|
||||
"adi,manual-span-operation-config not supported\n");
|
||||
|
||||
if (mspan > ARRAY_SIZE(ltc2664_mspan_lut))
|
||||
return dev_err_probe(dev, -EINVAL,
|
||||
"adi,manual-span-operation-config not in range\n");
|
||||
}
|
||||
|
||||
st->rfsadj_ohms = 20000;
|
||||
ret = device_property_read_u32(dev, "adi,rfsadj-ohms", &st->rfsadj_ohms);
|
||||
if (!ret) {
|
||||
if (!chip_info->rfsadj_support)
|
||||
return dev_err_probe(dev, -EINVAL,
|
||||
"adi,rfsadj-ohms not supported\n");
|
||||
|
||||
if (st->rfsadj_ohms < 19000 || st->rfsadj_ohms > 41000)
|
||||
return dev_err_probe(dev, -EINVAL,
|
||||
"adi,rfsadj-ohms not in range\n");
|
||||
}
|
||||
|
||||
device_for_each_child_node_scoped(dev, child) {
|
||||
struct ltc2664_chan *chan;
|
||||
|
||||
ret = fwnode_property_read_u32(child, "reg", ®);
|
||||
if (ret)
|
||||
return dev_err_probe(dev, ret,
|
||||
"Failed to get reg property\n");
|
||||
|
||||
if (reg >= chip_info->num_channels)
|
||||
return dev_err_probe(dev, -EINVAL,
|
||||
"reg bigger than: %d\n",
|
||||
chip_info->num_channels);
|
||||
|
||||
chan = &st->channels[reg];
|
||||
|
||||
if (fwnode_property_read_bool(child, "adi,toggle-mode")) {
|
||||
chan->toggle_chan = true;
|
||||
/* assume sw toggle ABI */
|
||||
st->iio_channels[reg].ext_info = ltc2664_toggle_sym_ext_info;
|
||||
|
||||
/*
|
||||
* Clear IIO_CHAN_INFO_RAW bit as toggle channels expose
|
||||
* out_voltage/current_raw{0|1} files.
|
||||
*/
|
||||
__clear_bit(IIO_CHAN_INFO_RAW,
|
||||
&st->iio_channels[reg].info_mask_separate);
|
||||
}
|
||||
|
||||
chan->raw[0] = ltc2664_mspan_lut[mspan][1];
|
||||
chan->raw[1] = ltc2664_mspan_lut[mspan][1];
|
||||
|
||||
chan->span = ltc2664_mspan_lut[mspan][0];
|
||||
|
||||
ret = fwnode_property_read_u32_array(child, "output-range-microvolt",
|
||||
tmp, ARRAY_SIZE(tmp));
|
||||
if (!ret && mspan == LTC2664_MSPAN_SOFTSPAN) {
|
||||
chan->span = ltc2664_set_span(st, tmp[0] / 1000,
|
||||
tmp[1] / 1000, reg);
|
||||
if (span < 0)
|
||||
return dev_err_probe(dev, span,
|
||||
"Failed to set span\n");
|
||||
}
|
||||
|
||||
ret = fwnode_property_read_u32_array(child, "output-range-microamp",
|
||||
tmp, ARRAY_SIZE(tmp));
|
||||
if (!ret) {
|
||||
chan->span = ltc2664_set_span(st, 0, tmp[1] / 1000, reg);
|
||||
if (span < 0)
|
||||
return dev_err_probe(dev, span,
|
||||
"Failed to set span\n");
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int ltc2664_setup(struct ltc2664_state *st)
|
||||
{
|
||||
const struct ltc2664_chip_info *chip_info = st->chip_info;
|
||||
struct gpio_desc *gpio;
|
||||
int ret, i;
|
||||
|
||||
/* If we have a clr/reset pin, use that to reset the chip. */
|
||||
gpio = devm_gpiod_get_optional(&st->spi->dev, "reset", GPIOD_OUT_HIGH);
|
||||
if (IS_ERR(gpio))
|
||||
return dev_err_probe(&st->spi->dev, PTR_ERR(gpio),
|
||||
"Failed to get reset gpio");
|
||||
if (gpio) {
|
||||
fsleep(1000);
|
||||
gpiod_set_value_cansleep(gpio, 0);
|
||||
}
|
||||
|
||||
/*
|
||||
* Duplicate the default channel configuration as it can change during
|
||||
* @ltc2664_channel_config()
|
||||
*/
|
||||
st->iio_channels = devm_kcalloc(&st->spi->dev,
|
||||
chip_info->num_channels,
|
||||
sizeof(struct iio_chan_spec),
|
||||
GFP_KERNEL);
|
||||
if (!st->iio_channels)
|
||||
return -ENOMEM;
|
||||
|
||||
for (i = 0; i < chip_info->num_channels; i++) {
|
||||
st->iio_channels[i] = ltc2664_channel_template;
|
||||
st->iio_channels[i].type = chip_info->measurement_type;
|
||||
st->iio_channels[i].channel = i;
|
||||
}
|
||||
|
||||
ret = ltc2664_channel_config(st);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
return regmap_set_bits(st->regmap, LTC2664_CMD_CONFIG, LTC2664_REF_DISABLE);
|
||||
}
|
||||
|
||||
static const struct regmap_config ltc2664_regmap_config = {
|
||||
.reg_bits = 8,
|
||||
.val_bits = 16,
|
||||
.max_register = LTC2664_CMD_NO_OPERATION,
|
||||
};
|
||||
|
||||
static const struct iio_info ltc2664_info = {
|
||||
.write_raw = ltc2664_write_raw,
|
||||
.read_raw = ltc2664_read_raw,
|
||||
.read_avail = ltc2664_read_avail,
|
||||
.debugfs_reg_access = ltc2664_reg_access,
|
||||
};
|
||||
|
||||
static int ltc2664_probe(struct spi_device *spi)
|
||||
{
|
||||
static const char * const regulators[] = { "vcc", "iovcc", "v-neg" };
|
||||
const struct ltc2664_chip_info *chip_info;
|
||||
struct device *dev = &spi->dev;
|
||||
struct iio_dev *indio_dev;
|
||||
struct ltc2664_state *st;
|
||||
int ret;
|
||||
|
||||
indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
|
||||
if (!indio_dev)
|
||||
return -ENOMEM;
|
||||
|
||||
st = iio_priv(indio_dev);
|
||||
st->spi = spi;
|
||||
|
||||
chip_info = spi_get_device_match_data(spi);
|
||||
if (!chip_info)
|
||||
return -ENODEV;
|
||||
|
||||
st->chip_info = chip_info;
|
||||
|
||||
mutex_init(&st->lock);
|
||||
|
||||
st->regmap = devm_regmap_init_spi(spi, <c2664_regmap_config);
|
||||
if (IS_ERR(st->regmap))
|
||||
return dev_err_probe(dev, PTR_ERR(st->regmap),
|
||||
"Failed to init regmap");
|
||||
|
||||
ret = devm_regulator_bulk_get_enable(dev, ARRAY_SIZE(regulators),
|
||||
regulators);
|
||||
if (ret)
|
||||
return dev_err_probe(dev, ret, "Failed to enable regulators\n");
|
||||
|
||||
ret = devm_regulator_get_enable_read_voltage(dev, "ref");
|
||||
if (ret < 0 && ret != -ENODEV)
|
||||
return ret;
|
||||
|
||||
st->vref_mv = ret > 0 ? ret / 1000 : chip_info->internal_vref_mv;
|
||||
|
||||
ret = ltc2664_setup(st);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
indio_dev->name = chip_info->name;
|
||||
indio_dev->info = <c2664_info;
|
||||
indio_dev->modes = INDIO_DIRECT_MODE;
|
||||
indio_dev->channels = st->iio_channels;
|
||||
indio_dev->num_channels = chip_info->num_channels;
|
||||
|
||||
return devm_iio_device_register(dev, indio_dev);
|
||||
}
|
||||
|
||||
static const struct spi_device_id ltc2664_id[] = {
|
||||
{ "ltc2664", (kernel_ulong_t)<c2664_chip },
|
||||
{ "ltc2672", (kernel_ulong_t)<c2672_chip },
|
||||
{ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(spi, ltc2664_id);
|
||||
|
||||
static const struct of_device_id ltc2664_of_id[] = {
|
||||
{ .compatible = "adi,ltc2664", .data = <c2664_chip },
|
||||
{ .compatible = "adi,ltc2672", .data = <c2672_chip },
|
||||
{ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, ltc2664_of_id);
|
||||
|
||||
static struct spi_driver ltc2664_driver = {
|
||||
.driver = {
|
||||
.name = "ltc2664",
|
||||
.of_match_table = ltc2664_of_id,
|
||||
},
|
||||
.probe = ltc2664_probe,
|
||||
.id_table = ltc2664_id,
|
||||
};
|
||||
module_spi_driver(ltc2664_driver);
|
||||
|
||||
MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
|
||||
MODULE_AUTHOR("Kim Seer Paller <kimseer.paller@analog.com>");
|
||||
MODULE_DESCRIPTION("Analog Devices LTC2664 and LTC2672 DAC");
|
||||
MODULE_LICENSE("GPL");
|
||||
Loading…
Reference in New Issue
Block a user