Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * IIO DAC emulation driver using a digital potentiometer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (C) 2016 Axentia Technologies AB
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * Author: Peter Rosin <peda@axentia.se>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  * It is assumed that the dpot is used as a voltage divider between the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12)  * current dpot wiper setting and the maximum resistance of the dpot. The
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13)  * divided voltage is provided by a vref regulator.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15)  *                   .------.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16)  *    .-----------.  |      |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17)  *    | vref      |--'    .---.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18)  *    | regulator |--.    |   |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19)  *    '-----------'  |    | d |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20)  *                   |    | p |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21)  *                   |    | o |  wiper
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22)  *                   |    | t |<---------+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23)  *                   |    |   |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24)  *                   |    '---'       dac output voltage
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25)  *                   |      |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26)  *                   '------+------------+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #include <linux/iio/consumer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) #include <linux/iio/iio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) #include <linux/regulator/consumer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) struct dpot_dac {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	struct regulator *vref;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	struct iio_channel *dpot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	u32 max_ohms;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) static const struct iio_chan_spec dpot_dac_iio_channel = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	.type = IIO_VOLTAGE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 			    | BIT(IIO_CHAN_INFO_SCALE),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	.info_mask_separate_available = BIT(IIO_CHAN_INFO_RAW),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	.output = 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	.indexed = 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) static int dpot_dac_read_raw(struct iio_dev *indio_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 			     struct iio_chan_spec const *chan,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 			     int *val, int *val2, long mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	struct dpot_dac *dac = iio_priv(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	unsigned long long tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	switch (mask) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	case IIO_CHAN_INFO_RAW:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 		return iio_read_channel_raw(dac->dpot, val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	case IIO_CHAN_INFO_SCALE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 		ret = iio_read_channel_scale(dac->dpot, val, val2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 		switch (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 		case IIO_VAL_FRACTIONAL_LOG2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 			tmp = *val * 1000000000LL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 			do_div(tmp, dac->max_ohms);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 			tmp *= regulator_get_voltage(dac->vref) / 1000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 			do_div(tmp, 1000000000LL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 			*val = tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 			return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 		case IIO_VAL_INT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 			/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 			 * Convert integer scale to fractional scale by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 			 * setting the denominator (val2) to one...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 			 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 			*val2 = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 			ret = IIO_VAL_FRACTIONAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 			/* ...and fall through. Say it again for GCC. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 			fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 		case IIO_VAL_FRACTIONAL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 			*val *= regulator_get_voltage(dac->vref) / 1000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 			*val2 *= dac->max_ohms;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) static int dpot_dac_read_avail(struct iio_dev *indio_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 			       struct iio_chan_spec const *chan,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 			       const int **vals, int *type, int *length,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 			       long mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	struct dpot_dac *dac = iio_priv(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	switch (mask) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	case IIO_CHAN_INFO_RAW:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 		*type = IIO_VAL_INT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 		return iio_read_avail_channel_raw(dac->dpot, vals, length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) static int dpot_dac_write_raw(struct iio_dev *indio_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 			      struct iio_chan_spec const *chan,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 			      int val, int val2, long mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	struct dpot_dac *dac = iio_priv(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	switch (mask) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	case IIO_CHAN_INFO_RAW:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 		return iio_write_channel_raw(dac->dpot, val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) static const struct iio_info dpot_dac_info = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	.read_raw = dpot_dac_read_raw,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	.read_avail = dpot_dac_read_avail,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	.write_raw = dpot_dac_write_raw,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) static int dpot_dac_channel_max_ohms(struct iio_dev *indio_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	struct device *dev = &indio_dev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	struct dpot_dac *dac = iio_priv(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	unsigned long long tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	int val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	int val2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	int max;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	ret = iio_read_max_channel_raw(dac->dpot, &max);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 		dev_err(dev, "dpot does not indicate its raw maximum value\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	switch (iio_read_channel_scale(dac->dpot, &val, &val2)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	case IIO_VAL_INT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		return max * val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	case IIO_VAL_FRACTIONAL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 		tmp = (unsigned long long)max * val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 		do_div(tmp, val2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		return tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	case IIO_VAL_FRACTIONAL_LOG2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		tmp = val * 1000000000LL * max >> val2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		do_div(tmp, 1000000000LL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 		return tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 		dev_err(dev, "dpot has a scale that is too weird\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) static int dpot_dac_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	struct device *dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	struct iio_dev *indio_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	struct dpot_dac *dac;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	enum iio_chan_type type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	indio_dev = devm_iio_device_alloc(dev, sizeof(*dac));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	if (!indio_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	platform_set_drvdata(pdev, indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	dac = iio_priv(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	indio_dev->name = dev_name(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	indio_dev->info = &dpot_dac_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	indio_dev->modes = INDIO_DIRECT_MODE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	indio_dev->channels = &dpot_dac_iio_channel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	indio_dev->num_channels = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	dac->vref = devm_regulator_get(dev, "vref");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	if (IS_ERR(dac->vref))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		return dev_err_probe(&pdev->dev, PTR_ERR(dac->vref),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 				     "failed to get vref regulator\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	dac->dpot = devm_iio_channel_get(dev, "dpot");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	if (IS_ERR(dac->dpot))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 		return dev_err_probe(&pdev->dev, PTR_ERR(dac->dpot),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 				     "failed to get dpot input channel\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	ret = iio_get_channel_type(dac->dpot, &type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	if (type != IIO_RESISTANCE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 		dev_err(dev, "dpot is of the wrong type\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	ret = dpot_dac_channel_max_ohms(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	dac->max_ohms = ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	ret = regulator_enable(dac->vref);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		dev_err(dev, "failed to enable the vref regulator\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	ret = iio_device_register(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 		dev_err(dev, "failed to register iio device\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 		goto disable_reg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) disable_reg:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	regulator_disable(dac->vref);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) static int dpot_dac_remove(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	struct dpot_dac *dac = iio_priv(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	iio_device_unregister(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	regulator_disable(dac->vref);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) static const struct of_device_id dpot_dac_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	{ .compatible = "dpot-dac" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	{ /* sentinel */ }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) MODULE_DEVICE_TABLE(of, dpot_dac_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) static struct platform_driver dpot_dac_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	.probe = dpot_dac_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	.remove = dpot_dac_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	.driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 		.name = "iio-dpot-dac",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 		.of_match_table = dpot_dac_match,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) module_platform_driver(dpot_dac_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) MODULE_DESCRIPTION("DAC emulation driver using a digital potentiometer");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) MODULE_AUTHOR("Peter Rosin <peda@axentia.se>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) MODULE_LICENSE("GPL v2");