Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * MP2629 Driver for ADC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright 2020 Monolithic Power Systems, Inc
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * Author: Saravanan Sekar <sravanhome@gmail.com>
^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) #include <linux/iio/driver.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/iio/iio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/iio/machine.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/mfd/mp2629.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/mutex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/regmap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #define	MP2629_REG_ADC_CTRL		0x03
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #define	MP2629_REG_BATT_VOLT		0x0e
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #define	MP2629_REG_SYSTEM_VOLT		0x0f
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #define	MP2629_REG_INPUT_VOLT		0x11
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #define	MP2629_REG_BATT_CURRENT		0x12
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #define	MP2629_REG_INPUT_CURRENT	0x13
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #define	MP2629_ADC_START		BIT(7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #define	MP2629_ADC_CONTINUOUS		BIT(6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #define MP2629_MAP(_mp, _mpc) IIO_MAP(#_mp, "mp2629_charger", "mp2629-"_mpc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) #define MP2629_ADC_CHAN(_ch, _type) {				\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	.type = _type,						\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	.indexed = 1,						\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	.datasheet_name = #_ch,					\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	.channel = MP2629_ ## _ch,				\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	.address = MP2629_REG_ ## _ch,				\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),		\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) struct mp2629_adc {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	struct regmap *regmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	struct device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) static struct iio_chan_spec mp2629_channels[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	MP2629_ADC_CHAN(BATT_VOLT, IIO_VOLTAGE),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	MP2629_ADC_CHAN(SYSTEM_VOLT, IIO_VOLTAGE),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	MP2629_ADC_CHAN(INPUT_VOLT, IIO_VOLTAGE),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	MP2629_ADC_CHAN(BATT_CURRENT, IIO_CURRENT),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	MP2629_ADC_CHAN(INPUT_CURRENT, IIO_CURRENT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) static struct iio_map mp2629_adc_maps[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	MP2629_MAP(BATT_VOLT, "batt-volt"),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	MP2629_MAP(SYSTEM_VOLT, "system-volt"),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	MP2629_MAP(INPUT_VOLT, "input-volt"),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	MP2629_MAP(BATT_CURRENT, "batt-current"),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	MP2629_MAP(INPUT_CURRENT, "input-current")
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) static int mp2629_read_raw(struct iio_dev *indio_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 			struct iio_chan_spec const *chan,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 			int *val, int *val2, long mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	struct mp2629_adc *info = iio_priv(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	unsigned int rval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	switch (mask) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	case IIO_CHAN_INFO_RAW:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 		ret = regmap_read(info->regmap, chan->address, &rval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 		if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 			return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		if (chan->address == MP2629_INPUT_VOLT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 			rval &= GENMASK(6, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		*val = rval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 		return IIO_VAL_INT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	case IIO_CHAN_INFO_SCALE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 		switch (chan->channel) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 		case MP2629_BATT_VOLT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		case MP2629_SYSTEM_VOLT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 			*val = 20;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 			return IIO_VAL_INT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 		case MP2629_INPUT_VOLT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 			*val = 60;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 			return IIO_VAL_INT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 		case MP2629_BATT_CURRENT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 			*val = 175;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 			*val2 = 10;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 			return IIO_VAL_FRACTIONAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 		case MP2629_INPUT_CURRENT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 			*val = 133;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 			*val2 = 10;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 			return IIO_VAL_FRACTIONAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 		default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	}
^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 const struct iio_info mp2629_adc_info = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	.read_raw = &mp2629_read_raw,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) static int mp2629_adc_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	struct device *dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	struct mp2629_data *ddata = dev_get_drvdata(dev->parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	struct mp2629_adc *info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	struct iio_dev *indio_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	indio_dev = devm_iio_device_alloc(dev, sizeof(*info));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	if (!indio_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	info = iio_priv(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	info->regmap = ddata->regmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	info->dev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	platform_set_drvdata(pdev, indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	ret = regmap_update_bits(info->regmap, MP2629_REG_ADC_CTRL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 				MP2629_ADC_START | MP2629_ADC_CONTINUOUS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 				MP2629_ADC_START | MP2629_ADC_CONTINUOUS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 		dev_err(dev, "adc enable fail: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	ret = iio_map_array_register(indio_dev, mp2629_adc_maps);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 		dev_err(dev, "IIO maps register fail: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 		goto fail_disable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	indio_dev->name = "mp2629-adc";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	indio_dev->dev.parent = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	indio_dev->channels = mp2629_channels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	indio_dev->num_channels = ARRAY_SIZE(mp2629_channels);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	indio_dev->modes = INDIO_DIRECT_MODE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	indio_dev->info = &mp2629_adc_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	ret = iio_device_register(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		dev_err(dev, "IIO device register fail: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		goto fail_map_unregister;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) fail_map_unregister:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	iio_map_array_unregister(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) fail_disable:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	regmap_update_bits(info->regmap, MP2629_REG_ADC_CTRL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 					 MP2629_ADC_CONTINUOUS, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	regmap_update_bits(info->regmap, MP2629_REG_ADC_CTRL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 					 MP2629_ADC_START, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) static int mp2629_adc_remove(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	struct mp2629_adc *info = iio_priv(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	iio_device_unregister(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	iio_map_array_unregister(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	regmap_update_bits(info->regmap, MP2629_REG_ADC_CTRL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 					 MP2629_ADC_CONTINUOUS, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	regmap_update_bits(info->regmap, MP2629_REG_ADC_CTRL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 					 MP2629_ADC_START, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) static const struct of_device_id mp2629_adc_of_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	{ .compatible = "mps,mp2629_adc"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	{}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) MODULE_DEVICE_TABLE(of, mp2629_adc_of_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) static struct platform_driver mp2629_adc_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	.driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 		.name = "mp2629_adc",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 		.of_match_table = mp2629_adc_of_match,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	.probe		= mp2629_adc_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	.remove		= mp2629_adc_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) module_platform_driver(mp2629_adc_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) MODULE_AUTHOR("Saravanan Sekar <sravanhome@gmail.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) MODULE_DESCRIPTION("MP2629 ADC driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) MODULE_LICENSE("GPL");