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468 lines
11 KiB
468 lines
11 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* AD5760, AD5780, AD5781, AD5790, AD5791 Voltage Output Digital to Analog |
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* Converter |
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* |
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* Copyright 2011 Analog Devices Inc. |
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*/ |
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#include <linux/interrupt.h> |
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#include <linux/fs.h> |
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#include <linux/device.h> |
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#include <linux/kernel.h> |
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#include <linux/spi/spi.h> |
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#include <linux/slab.h> |
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#include <linux/sysfs.h> |
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#include <linux/regulator/consumer.h> |
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#include <linux/module.h> |
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#include <linux/bitops.h> |
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#include <linux/iio/iio.h> |
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#include <linux/iio/sysfs.h> |
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#include <linux/iio/dac/ad5791.h> |
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#define AD5791_DAC_MASK GENMASK(19, 0) |
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#define AD5791_CMD_READ BIT(23) |
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#define AD5791_CMD_WRITE 0 |
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#define AD5791_ADDR(addr) ((addr) << 20) |
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/* Registers */ |
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#define AD5791_ADDR_NOOP 0 |
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#define AD5791_ADDR_DAC0 1 |
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#define AD5791_ADDR_CTRL 2 |
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#define AD5791_ADDR_CLRCODE 3 |
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#define AD5791_ADDR_SW_CTRL 4 |
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|
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/* Control Register */ |
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#define AD5791_CTRL_RBUF BIT(1) |
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#define AD5791_CTRL_OPGND BIT(2) |
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#define AD5791_CTRL_DACTRI BIT(3) |
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#define AD5791_CTRL_BIN2SC BIT(4) |
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#define AD5791_CTRL_SDODIS BIT(5) |
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#define AD5761_CTRL_LINCOMP(x) ((x) << 6) |
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#define AD5791_LINCOMP_0_10 0 |
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#define AD5791_LINCOMP_10_12 1 |
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#define AD5791_LINCOMP_12_16 2 |
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#define AD5791_LINCOMP_16_19 3 |
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#define AD5791_LINCOMP_19_20 12 |
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#define AD5780_LINCOMP_0_10 0 |
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#define AD5780_LINCOMP_10_20 12 |
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/* Software Control Register */ |
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#define AD5791_SWCTRL_LDAC BIT(0) |
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#define AD5791_SWCTRL_CLR BIT(1) |
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#define AD5791_SWCTRL_RESET BIT(2) |
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#define AD5791_DAC_PWRDN_6K 0 |
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#define AD5791_DAC_PWRDN_3STATE 1 |
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/** |
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* struct ad5791_chip_info - chip specific information |
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* @get_lin_comp: function pointer to the device specific function |
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*/ |
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struct ad5791_chip_info { |
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int (*get_lin_comp) (unsigned int span); |
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}; |
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/** |
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* struct ad5791_state - driver instance specific data |
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* @spi: spi_device |
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* @reg_vdd: positive supply regulator |
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* @reg_vss: negative supply regulator |
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* @chip_info: chip model specific constants |
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* @vref_mv: actual reference voltage used |
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* @vref_neg_mv: voltage of the negative supply |
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* @ctrl: control regster cache |
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* @pwr_down_mode: current power down mode |
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* @pwr_down: true if device is powered down |
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* @data: spi transfer buffers |
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*/ |
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struct ad5791_state { |
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struct spi_device *spi; |
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struct regulator *reg_vdd; |
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struct regulator *reg_vss; |
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const struct ad5791_chip_info *chip_info; |
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unsigned short vref_mv; |
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unsigned int vref_neg_mv; |
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unsigned ctrl; |
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unsigned pwr_down_mode; |
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bool pwr_down; |
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union { |
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__be32 d32; |
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u8 d8[4]; |
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} data[3] ____cacheline_aligned; |
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}; |
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enum ad5791_supported_device_ids { |
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ID_AD5760, |
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ID_AD5780, |
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ID_AD5781, |
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ID_AD5791, |
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}; |
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static int ad5791_spi_write(struct ad5791_state *st, u8 addr, u32 val) |
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{ |
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st->data[0].d32 = cpu_to_be32(AD5791_CMD_WRITE | |
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AD5791_ADDR(addr) | |
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(val & AD5791_DAC_MASK)); |
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return spi_write(st->spi, &st->data[0].d8[1], 3); |
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} |
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static int ad5791_spi_read(struct ad5791_state *st, u8 addr, u32 *val) |
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{ |
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int ret; |
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struct spi_transfer xfers[] = { |
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{ |
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.tx_buf = &st->data[0].d8[1], |
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.bits_per_word = 8, |
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.len = 3, |
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.cs_change = 1, |
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}, { |
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.tx_buf = &st->data[1].d8[1], |
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.rx_buf = &st->data[2].d8[1], |
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.bits_per_word = 8, |
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.len = 3, |
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}, |
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}; |
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st->data[0].d32 = cpu_to_be32(AD5791_CMD_READ | |
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AD5791_ADDR(addr)); |
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st->data[1].d32 = cpu_to_be32(AD5791_ADDR(AD5791_ADDR_NOOP)); |
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ret = spi_sync_transfer(st->spi, xfers, ARRAY_SIZE(xfers)); |
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*val = be32_to_cpu(st->data[2].d32); |
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return ret; |
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} |
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static const char * const ad5791_powerdown_modes[] = { |
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"6kohm_to_gnd", |
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"three_state", |
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}; |
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static int ad5791_get_powerdown_mode(struct iio_dev *indio_dev, |
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const struct iio_chan_spec *chan) |
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{ |
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struct ad5791_state *st = iio_priv(indio_dev); |
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return st->pwr_down_mode; |
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} |
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static int ad5791_set_powerdown_mode(struct iio_dev *indio_dev, |
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const struct iio_chan_spec *chan, unsigned int mode) |
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{ |
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struct ad5791_state *st = iio_priv(indio_dev); |
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st->pwr_down_mode = mode; |
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return 0; |
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} |
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static const struct iio_enum ad5791_powerdown_mode_enum = { |
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.items = ad5791_powerdown_modes, |
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.num_items = ARRAY_SIZE(ad5791_powerdown_modes), |
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.get = ad5791_get_powerdown_mode, |
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.set = ad5791_set_powerdown_mode, |
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}; |
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static ssize_t ad5791_read_dac_powerdown(struct iio_dev *indio_dev, |
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uintptr_t private, const struct iio_chan_spec *chan, char *buf) |
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{ |
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struct ad5791_state *st = iio_priv(indio_dev); |
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return sprintf(buf, "%d\n", st->pwr_down); |
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} |
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static ssize_t ad5791_write_dac_powerdown(struct iio_dev *indio_dev, |
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uintptr_t private, const struct iio_chan_spec *chan, const char *buf, |
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size_t len) |
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{ |
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bool pwr_down; |
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int ret; |
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struct ad5791_state *st = iio_priv(indio_dev); |
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ret = strtobool(buf, &pwr_down); |
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if (ret) |
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return ret; |
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if (!pwr_down) { |
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st->ctrl &= ~(AD5791_CTRL_OPGND | AD5791_CTRL_DACTRI); |
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} else { |
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if (st->pwr_down_mode == AD5791_DAC_PWRDN_6K) |
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st->ctrl |= AD5791_CTRL_OPGND; |
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else if (st->pwr_down_mode == AD5791_DAC_PWRDN_3STATE) |
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st->ctrl |= AD5791_CTRL_DACTRI; |
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} |
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st->pwr_down = pwr_down; |
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ret = ad5791_spi_write(st, AD5791_ADDR_CTRL, st->ctrl); |
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return ret ? ret : len; |
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} |
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static int ad5791_get_lin_comp(unsigned int span) |
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{ |
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if (span <= 10000) |
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return AD5791_LINCOMP_0_10; |
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else if (span <= 12000) |
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return AD5791_LINCOMP_10_12; |
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else if (span <= 16000) |
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return AD5791_LINCOMP_12_16; |
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else if (span <= 19000) |
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return AD5791_LINCOMP_16_19; |
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else |
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return AD5791_LINCOMP_19_20; |
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} |
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static int ad5780_get_lin_comp(unsigned int span) |
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{ |
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if (span <= 10000) |
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return AD5780_LINCOMP_0_10; |
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else |
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return AD5780_LINCOMP_10_20; |
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} |
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static const struct ad5791_chip_info ad5791_chip_info_tbl[] = { |
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[ID_AD5760] = { |
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.get_lin_comp = ad5780_get_lin_comp, |
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}, |
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[ID_AD5780] = { |
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.get_lin_comp = ad5780_get_lin_comp, |
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}, |
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[ID_AD5781] = { |
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.get_lin_comp = ad5791_get_lin_comp, |
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}, |
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[ID_AD5791] = { |
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.get_lin_comp = ad5791_get_lin_comp, |
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}, |
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}; |
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static int ad5791_read_raw(struct iio_dev *indio_dev, |
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struct iio_chan_spec const *chan, |
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int *val, |
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int *val2, |
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long m) |
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{ |
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struct ad5791_state *st = iio_priv(indio_dev); |
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u64 val64; |
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int ret; |
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switch (m) { |
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case IIO_CHAN_INFO_RAW: |
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ret = ad5791_spi_read(st, chan->address, val); |
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if (ret) |
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return ret; |
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*val &= AD5791_DAC_MASK; |
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*val >>= chan->scan_type.shift; |
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return IIO_VAL_INT; |
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case IIO_CHAN_INFO_SCALE: |
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*val = st->vref_mv; |
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*val2 = (1 << chan->scan_type.realbits) - 1; |
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return IIO_VAL_FRACTIONAL; |
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case IIO_CHAN_INFO_OFFSET: |
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val64 = (((u64)st->vref_neg_mv) << chan->scan_type.realbits); |
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do_div(val64, st->vref_mv); |
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*val = -val64; |
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return IIO_VAL_INT; |
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default: |
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return -EINVAL; |
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} |
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}; |
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static const struct iio_chan_spec_ext_info ad5791_ext_info[] = { |
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{ |
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.name = "powerdown", |
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.shared = IIO_SHARED_BY_TYPE, |
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.read = ad5791_read_dac_powerdown, |
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.write = ad5791_write_dac_powerdown, |
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}, |
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IIO_ENUM("powerdown_mode", IIO_SHARED_BY_TYPE, |
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&ad5791_powerdown_mode_enum), |
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IIO_ENUM_AVAILABLE("powerdown_mode", &ad5791_powerdown_mode_enum), |
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{ }, |
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}; |
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#define AD5791_CHAN(bits, _shift) { \ |
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.type = IIO_VOLTAGE, \ |
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.output = 1, \ |
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.indexed = 1, \ |
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.address = AD5791_ADDR_DAC0, \ |
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.channel = 0, \ |
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ |
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \ |
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BIT(IIO_CHAN_INFO_OFFSET), \ |
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.scan_type = { \ |
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.sign = 'u', \ |
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.realbits = (bits), \ |
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.storagebits = 24, \ |
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.shift = (_shift), \ |
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}, \ |
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.ext_info = ad5791_ext_info, \ |
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} |
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static const struct iio_chan_spec ad5791_channels[] = { |
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[ID_AD5760] = AD5791_CHAN(16, 4), |
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[ID_AD5780] = AD5791_CHAN(18, 2), |
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[ID_AD5781] = AD5791_CHAN(18, 2), |
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[ID_AD5791] = AD5791_CHAN(20, 0) |
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}; |
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static int ad5791_write_raw(struct iio_dev *indio_dev, |
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struct iio_chan_spec const *chan, |
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int val, |
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int val2, |
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long mask) |
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{ |
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struct ad5791_state *st = iio_priv(indio_dev); |
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switch (mask) { |
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case IIO_CHAN_INFO_RAW: |
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val &= GENMASK(chan->scan_type.realbits - 1, 0); |
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val <<= chan->scan_type.shift; |
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return ad5791_spi_write(st, chan->address, 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 const struct iio_info ad5791_info = { |
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.read_raw = &ad5791_read_raw, |
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.write_raw = &ad5791_write_raw, |
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}; |
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static int ad5791_probe(struct spi_device *spi) |
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{ |
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struct ad5791_platform_data *pdata = spi->dev.platform_data; |
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struct iio_dev *indio_dev; |
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struct ad5791_state *st; |
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int ret, pos_voltage_uv = 0, neg_voltage_uv = 0; |
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indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st)); |
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if (!indio_dev) |
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return -ENOMEM; |
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st = iio_priv(indio_dev); |
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st->reg_vdd = devm_regulator_get(&spi->dev, "vdd"); |
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if (!IS_ERR(st->reg_vdd)) { |
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ret = regulator_enable(st->reg_vdd); |
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if (ret) |
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return ret; |
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ret = regulator_get_voltage(st->reg_vdd); |
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if (ret < 0) |
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goto error_disable_reg_pos; |
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pos_voltage_uv = ret; |
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} |
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st->reg_vss = devm_regulator_get(&spi->dev, "vss"); |
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if (!IS_ERR(st->reg_vss)) { |
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ret = regulator_enable(st->reg_vss); |
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if (ret) |
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goto error_disable_reg_pos; |
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ret = regulator_get_voltage(st->reg_vss); |
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if (ret < 0) |
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goto error_disable_reg_neg; |
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neg_voltage_uv = ret; |
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} |
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st->pwr_down = true; |
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st->spi = spi; |
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if (!IS_ERR(st->reg_vss) && !IS_ERR(st->reg_vdd)) { |
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st->vref_mv = (pos_voltage_uv + neg_voltage_uv) / 1000; |
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st->vref_neg_mv = neg_voltage_uv / 1000; |
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} else if (pdata) { |
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st->vref_mv = pdata->vref_pos_mv + pdata->vref_neg_mv; |
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st->vref_neg_mv = pdata->vref_neg_mv; |
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} else { |
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dev_warn(&spi->dev, "reference voltage unspecified\n"); |
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} |
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ret = ad5791_spi_write(st, AD5791_ADDR_SW_CTRL, AD5791_SWCTRL_RESET); |
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if (ret) |
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goto error_disable_reg_neg; |
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st->chip_info = &ad5791_chip_info_tbl[spi_get_device_id(spi) |
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->driver_data]; |
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st->ctrl = AD5761_CTRL_LINCOMP(st->chip_info->get_lin_comp(st->vref_mv)) |
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| ((pdata && pdata->use_rbuf_gain2) ? 0 : AD5791_CTRL_RBUF) | |
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AD5791_CTRL_BIN2SC; |
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ret = ad5791_spi_write(st, AD5791_ADDR_CTRL, st->ctrl | |
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AD5791_CTRL_OPGND | AD5791_CTRL_DACTRI); |
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if (ret) |
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goto error_disable_reg_neg; |
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spi_set_drvdata(spi, indio_dev); |
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indio_dev->info = &ad5791_info; |
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indio_dev->modes = INDIO_DIRECT_MODE; |
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indio_dev->channels |
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= &ad5791_channels[spi_get_device_id(spi)->driver_data]; |
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indio_dev->num_channels = 1; |
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indio_dev->name = spi_get_device_id(st->spi)->name; |
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ret = iio_device_register(indio_dev); |
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if (ret) |
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goto error_disable_reg_neg; |
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return 0; |
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error_disable_reg_neg: |
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if (!IS_ERR(st->reg_vss)) |
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regulator_disable(st->reg_vss); |
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error_disable_reg_pos: |
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if (!IS_ERR(st->reg_vdd)) |
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regulator_disable(st->reg_vdd); |
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return ret; |
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} |
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static int ad5791_remove(struct spi_device *spi) |
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{ |
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struct iio_dev *indio_dev = spi_get_drvdata(spi); |
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struct ad5791_state *st = iio_priv(indio_dev); |
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iio_device_unregister(indio_dev); |
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if (!IS_ERR(st->reg_vdd)) |
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regulator_disable(st->reg_vdd); |
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if (!IS_ERR(st->reg_vss)) |
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regulator_disable(st->reg_vss); |
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return 0; |
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} |
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static const struct spi_device_id ad5791_id[] = { |
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{"ad5760", ID_AD5760}, |
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{"ad5780", ID_AD5780}, |
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{"ad5781", ID_AD5781}, |
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{"ad5790", ID_AD5791}, |
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{"ad5791", ID_AD5791}, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(spi, ad5791_id); |
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static struct spi_driver ad5791_driver = { |
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.driver = { |
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.name = "ad5791", |
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}, |
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.probe = ad5791_probe, |
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.remove = ad5791_remove, |
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.id_table = ad5791_id, |
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}; |
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module_spi_driver(ad5791_driver); |
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MODULE_AUTHOR("Michael Hennerich <[email protected]>"); |
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MODULE_DESCRIPTION("Analog Devices AD5760/AD5780/AD5781/AD5790/AD5791 DAC"); |
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MODULE_LICENSE("GPL v2");
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