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![Lars-Peter Clausen](/assets/img/avatar_default.png)
If a driver does not assign an of_node to a IIO device to IIO core will automatically assign the of_node of the parent device. This automatic assignment is done in the iio_device_register() function. There is a fair amount of drivers that currently manually assign the of_node of the IIO device. All but 4 of them can make use of the automatic assignment though. The exceptions are: * mxs-lradc-adc: Which uses the of_node of the parent of the parent. * stm32-dfsdm-adc, stm32-adc and stm32-dac: Which reference the of_node assigned to the IIO device before iio_device_register() is called. All other drivers are updated to use automatic assignment. This reduces the amount of boilerplate code involved in setting up the IIO device. The patch has mostly been auto-generated with the following semantic patch // <smpl> @exists@ expression indio_dev; expression parent; @@ indio_dev = \(devm_iio_device_alloc\|iio_device_alloc\)(&parent, ...) ... -indio_dev->dev.of_node = parent.of_node; @exists@ expression indio_dev; expression parent; @@ indio_dev = \(devm_iio_device_alloc\|iio_device_alloc\)(parent, ...) ... -indio_dev->dev.of_node = parent->of_node; // </smpl> Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
248 lines
5.6 KiB
C
248 lines
5.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* TI LP8788 MFD - ADC driver
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*
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* Copyright 2012 Texas Instruments
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*
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* Author: Milo(Woogyom) Kim <milo.kim@ti.com>
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*/
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#include <linux/delay.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/driver.h>
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#include <linux/iio/machine.h>
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#include <linux/mfd/lp8788.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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/* register address */
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#define LP8788_ADC_CONF 0x60
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#define LP8788_ADC_RAW 0x61
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#define LP8788_ADC_DONE 0x63
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#define ADC_CONV_START 1
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struct lp8788_adc {
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struct lp8788 *lp;
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struct iio_map *map;
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struct mutex lock;
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};
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static const int lp8788_scale[LPADC_MAX] = {
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[LPADC_VBATT_5P5] = 1343101,
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[LPADC_VIN_CHG] = 3052503,
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[LPADC_IBATT] = 610500,
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[LPADC_IC_TEMP] = 61050,
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[LPADC_VBATT_6P0] = 1465201,
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[LPADC_VBATT_5P0] = 1221001,
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[LPADC_ADC1] = 610500,
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[LPADC_ADC2] = 610500,
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[LPADC_VDD] = 1025641,
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[LPADC_VCOIN] = 757020,
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[LPADC_ADC3] = 610500,
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[LPADC_ADC4] = 610500,
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};
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static int lp8788_get_adc_result(struct lp8788_adc *adc, enum lp8788_adc_id id,
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int *val)
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{
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unsigned int msb;
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unsigned int lsb;
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unsigned int result;
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u8 data;
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u8 rawdata[2];
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int size = ARRAY_SIZE(rawdata);
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int retry = 5;
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int ret;
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data = (id << 1) | ADC_CONV_START;
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ret = lp8788_write_byte(adc->lp, LP8788_ADC_CONF, data);
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if (ret)
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goto err_io;
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/* retry until adc conversion is done */
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data = 0;
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while (retry--) {
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usleep_range(100, 200);
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ret = lp8788_read_byte(adc->lp, LP8788_ADC_DONE, &data);
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if (ret)
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goto err_io;
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/* conversion done */
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if (data)
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break;
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}
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ret = lp8788_read_multi_bytes(adc->lp, LP8788_ADC_RAW, rawdata, size);
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if (ret)
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goto err_io;
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msb = (rawdata[0] << 4) & 0x00000ff0;
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lsb = (rawdata[1] >> 4) & 0x0000000f;
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result = msb | lsb;
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*val = result;
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return 0;
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err_io:
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return ret;
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}
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static int lp8788_adc_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val, int *val2, long mask)
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{
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struct lp8788_adc *adc = iio_priv(indio_dev);
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enum lp8788_adc_id id = chan->channel;
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int ret;
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mutex_lock(&adc->lock);
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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ret = lp8788_get_adc_result(adc, id, val) ? -EIO : IIO_VAL_INT;
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break;
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case IIO_CHAN_INFO_SCALE:
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*val = lp8788_scale[id] / 1000000;
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*val2 = lp8788_scale[id] % 1000000;
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ret = IIO_VAL_INT_PLUS_MICRO;
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break;
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default:
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ret = -EINVAL;
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break;
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}
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mutex_unlock(&adc->lock);
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return ret;
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}
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static const struct iio_info lp8788_adc_info = {
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.read_raw = &lp8788_adc_read_raw,
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};
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#define LP8788_CHAN(_id, _type) { \
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.type = _type, \
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.indexed = 1, \
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.channel = LPADC_##_id, \
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
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BIT(IIO_CHAN_INFO_SCALE), \
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.datasheet_name = #_id, \
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}
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static const struct iio_chan_spec lp8788_adc_channels[] = {
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[LPADC_VBATT_5P5] = LP8788_CHAN(VBATT_5P5, IIO_VOLTAGE),
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[LPADC_VIN_CHG] = LP8788_CHAN(VIN_CHG, IIO_VOLTAGE),
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[LPADC_IBATT] = LP8788_CHAN(IBATT, IIO_CURRENT),
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[LPADC_IC_TEMP] = LP8788_CHAN(IC_TEMP, IIO_TEMP),
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[LPADC_VBATT_6P0] = LP8788_CHAN(VBATT_6P0, IIO_VOLTAGE),
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[LPADC_VBATT_5P0] = LP8788_CHAN(VBATT_5P0, IIO_VOLTAGE),
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[LPADC_ADC1] = LP8788_CHAN(ADC1, IIO_VOLTAGE),
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[LPADC_ADC2] = LP8788_CHAN(ADC2, IIO_VOLTAGE),
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[LPADC_VDD] = LP8788_CHAN(VDD, IIO_VOLTAGE),
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[LPADC_VCOIN] = LP8788_CHAN(VCOIN, IIO_VOLTAGE),
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[LPADC_ADC3] = LP8788_CHAN(ADC3, IIO_VOLTAGE),
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[LPADC_ADC4] = LP8788_CHAN(ADC4, IIO_VOLTAGE),
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};
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/* default maps used by iio consumer (lp8788-charger driver) */
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static struct iio_map lp8788_default_iio_maps[] = {
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{
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.consumer_dev_name = "lp8788-charger",
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.consumer_channel = "lp8788_vbatt_5p0",
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.adc_channel_label = "VBATT_5P0",
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},
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{
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.consumer_dev_name = "lp8788-charger",
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.consumer_channel = "lp8788_adc1",
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.adc_channel_label = "ADC1",
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},
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{ }
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};
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static int lp8788_iio_map_register(struct iio_dev *indio_dev,
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struct lp8788_platform_data *pdata,
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struct lp8788_adc *adc)
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{
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struct iio_map *map;
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int ret;
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map = (!pdata || !pdata->adc_pdata) ?
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lp8788_default_iio_maps : pdata->adc_pdata;
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ret = iio_map_array_register(indio_dev, map);
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if (ret) {
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dev_err(&indio_dev->dev, "iio map err: %d\n", ret);
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return ret;
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}
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adc->map = map;
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return 0;
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}
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static int lp8788_adc_probe(struct platform_device *pdev)
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{
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struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent);
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struct iio_dev *indio_dev;
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struct lp8788_adc *adc;
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int ret;
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indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*adc));
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if (!indio_dev)
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return -ENOMEM;
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adc = iio_priv(indio_dev);
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adc->lp = lp;
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platform_set_drvdata(pdev, indio_dev);
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ret = lp8788_iio_map_register(indio_dev, lp->pdata, adc);
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if (ret)
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return ret;
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mutex_init(&adc->lock);
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indio_dev->name = pdev->name;
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->info = &lp8788_adc_info;
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indio_dev->channels = lp8788_adc_channels;
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indio_dev->num_channels = ARRAY_SIZE(lp8788_adc_channels);
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ret = iio_device_register(indio_dev);
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if (ret) {
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dev_err(&pdev->dev, "iio dev register err: %d\n", ret);
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goto err_iio_device;
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}
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return 0;
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err_iio_device:
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iio_map_array_unregister(indio_dev);
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return ret;
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}
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static int lp8788_adc_remove(struct platform_device *pdev)
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{
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struct iio_dev *indio_dev = platform_get_drvdata(pdev);
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iio_device_unregister(indio_dev);
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iio_map_array_unregister(indio_dev);
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return 0;
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}
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static struct platform_driver lp8788_adc_driver = {
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.probe = lp8788_adc_probe,
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.remove = lp8788_adc_remove,
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.driver = {
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.name = LP8788_DEV_ADC,
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},
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};
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module_platform_driver(lp8788_adc_driver);
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MODULE_DESCRIPTION("Texas Instruments LP8788 ADC Driver");
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MODULE_AUTHOR("Milo Kim");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:lp8788-adc");
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