265 lines
6.2 KiB
C
265 lines
6.2 KiB
C
/*
|
|
* TI LP8788 MFD - ADC driver
|
|
*
|
|
* Copyright 2012 Texas Instruments
|
|
*
|
|
* Author: Milo(Woogyom) Kim <milo.kim@ti.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/delay.h>
|
|
#include <linux/iio/iio.h>
|
|
#include <linux/iio/driver.h>
|
|
#include <linux/iio/machine.h>
|
|
#include <linux/mfd/lp8788.h>
|
|
#include <linux/module.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/slab.h>
|
|
|
|
/* register address */
|
|
#define LP8788_ADC_CONF 0x60
|
|
#define LP8788_ADC_RAW 0x61
|
|
#define LP8788_ADC_DONE 0x63
|
|
|
|
#define ADC_CONV_START 1
|
|
|
|
struct lp8788_adc {
|
|
struct lp8788 *lp;
|
|
struct iio_map *map;
|
|
struct mutex lock;
|
|
};
|
|
|
|
static const int lp8788_scale[LPADC_MAX] = {
|
|
[LPADC_VBATT_5P5] = 1343101,
|
|
[LPADC_VIN_CHG] = 3052503,
|
|
[LPADC_IBATT] = 610500,
|
|
[LPADC_IC_TEMP] = 61050,
|
|
[LPADC_VBATT_6P0] = 1465201,
|
|
[LPADC_VBATT_5P0] = 1221001,
|
|
[LPADC_ADC1] = 610500,
|
|
[LPADC_ADC2] = 610500,
|
|
[LPADC_VDD] = 1025641,
|
|
[LPADC_VCOIN] = 757020,
|
|
[LPADC_ADC3] = 610500,
|
|
[LPADC_ADC4] = 610500,
|
|
};
|
|
|
|
static int lp8788_get_adc_result(struct lp8788_adc *adc, enum lp8788_adc_id id,
|
|
int *val)
|
|
{
|
|
unsigned int msb;
|
|
unsigned int lsb;
|
|
unsigned int result;
|
|
u8 data;
|
|
u8 rawdata[2];
|
|
int size = ARRAY_SIZE(rawdata);
|
|
int retry = 5;
|
|
int ret;
|
|
|
|
data = (id << 1) | ADC_CONV_START;
|
|
ret = lp8788_write_byte(adc->lp, LP8788_ADC_CONF, data);
|
|
if (ret)
|
|
goto err_io;
|
|
|
|
/* retry until adc conversion is done */
|
|
data = 0;
|
|
while (retry--) {
|
|
usleep_range(100, 200);
|
|
|
|
ret = lp8788_read_byte(adc->lp, LP8788_ADC_DONE, &data);
|
|
if (ret)
|
|
goto err_io;
|
|
|
|
/* conversion done */
|
|
if (data)
|
|
break;
|
|
}
|
|
|
|
ret = lp8788_read_multi_bytes(adc->lp, LP8788_ADC_RAW, rawdata, size);
|
|
if (ret)
|
|
goto err_io;
|
|
|
|
msb = (rawdata[0] << 4) & 0x00000ff0;
|
|
lsb = (rawdata[1] >> 4) & 0x0000000f;
|
|
result = msb | lsb;
|
|
*val = result;
|
|
|
|
return 0;
|
|
|
|
err_io:
|
|
return ret;
|
|
}
|
|
|
|
static int lp8788_adc_read_raw(struct iio_dev *indio_dev,
|
|
struct iio_chan_spec const *chan,
|
|
int *val, int *val2, long mask)
|
|
{
|
|
struct lp8788_adc *adc = iio_priv(indio_dev);
|
|
enum lp8788_adc_id id = chan->channel;
|
|
int ret;
|
|
|
|
mutex_lock(&adc->lock);
|
|
|
|
switch (mask) {
|
|
case IIO_CHAN_INFO_RAW:
|
|
ret = lp8788_get_adc_result(adc, id, val) ? -EIO : IIO_VAL_INT;
|
|
break;
|
|
case IIO_CHAN_INFO_SCALE:
|
|
*val = lp8788_scale[id] / 1000000;
|
|
*val2 = lp8788_scale[id] % 1000000;
|
|
ret = IIO_VAL_INT_PLUS_MICRO;
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
mutex_unlock(&adc->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct iio_info lp8788_adc_info = {
|
|
.read_raw = &lp8788_adc_read_raw,
|
|
.driver_module = THIS_MODULE,
|
|
};
|
|
|
|
#define LP8788_CHAN(_id, _type) { \
|
|
.type = _type, \
|
|
.indexed = 1, \
|
|
.channel = LPADC_##_id, \
|
|
.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | \
|
|
IIO_CHAN_INFO_SCALE_SEPARATE_BIT, \
|
|
.datasheet_name = #_id, \
|
|
}
|
|
|
|
static const struct iio_chan_spec lp8788_adc_channels[] = {
|
|
[LPADC_VBATT_5P5] = LP8788_CHAN(VBATT_5P5, IIO_VOLTAGE),
|
|
[LPADC_VIN_CHG] = LP8788_CHAN(VIN_CHG, IIO_VOLTAGE),
|
|
[LPADC_IBATT] = LP8788_CHAN(IBATT, IIO_CURRENT),
|
|
[LPADC_IC_TEMP] = LP8788_CHAN(IC_TEMP, IIO_TEMP),
|
|
[LPADC_VBATT_6P0] = LP8788_CHAN(VBATT_6P0, IIO_VOLTAGE),
|
|
[LPADC_VBATT_5P0] = LP8788_CHAN(VBATT_5P0, IIO_VOLTAGE),
|
|
[LPADC_ADC1] = LP8788_CHAN(ADC1, IIO_VOLTAGE),
|
|
[LPADC_ADC2] = LP8788_CHAN(ADC2, IIO_VOLTAGE),
|
|
[LPADC_VDD] = LP8788_CHAN(VDD, IIO_VOLTAGE),
|
|
[LPADC_VCOIN] = LP8788_CHAN(VCOIN, IIO_VOLTAGE),
|
|
[LPADC_ADC3] = LP8788_CHAN(ADC3, IIO_VOLTAGE),
|
|
[LPADC_ADC4] = LP8788_CHAN(ADC4, IIO_VOLTAGE),
|
|
};
|
|
|
|
/* default maps used by iio consumer (lp8788-charger driver) */
|
|
static struct iio_map lp8788_default_iio_maps[] = {
|
|
{
|
|
.consumer_dev_name = "lp8788-charger",
|
|
.consumer_channel = "lp8788_vbatt_5p0",
|
|
.adc_channel_label = "VBATT_5P0",
|
|
},
|
|
{
|
|
.consumer_dev_name = "lp8788-charger",
|
|
.consumer_channel = "lp8788_adc1",
|
|
.adc_channel_label = "ADC1",
|
|
},
|
|
{ }
|
|
};
|
|
|
|
static int lp8788_iio_map_register(struct iio_dev *indio_dev,
|
|
struct lp8788_platform_data *pdata,
|
|
struct lp8788_adc *adc)
|
|
{
|
|
struct iio_map *map;
|
|
int ret;
|
|
|
|
map = (!pdata || !pdata->adc_pdata) ?
|
|
lp8788_default_iio_maps : pdata->adc_pdata;
|
|
|
|
ret = iio_map_array_register(indio_dev, map);
|
|
if (ret) {
|
|
dev_err(adc->lp->dev, "iio map err: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
adc->map = map;
|
|
return 0;
|
|
}
|
|
|
|
static inline void lp8788_iio_map_unregister(struct iio_dev *indio_dev,
|
|
struct lp8788_adc *adc)
|
|
{
|
|
iio_map_array_unregister(indio_dev, adc->map);
|
|
}
|
|
|
|
static int __devinit lp8788_adc_probe(struct platform_device *pdev)
|
|
{
|
|
struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent);
|
|
struct iio_dev *indio_dev;
|
|
struct lp8788_adc *adc;
|
|
int ret;
|
|
|
|
indio_dev = iio_device_alloc(sizeof(*adc));
|
|
if (!indio_dev)
|
|
return -ENOMEM;
|
|
|
|
adc = iio_priv(indio_dev);
|
|
adc->lp = lp;
|
|
platform_set_drvdata(pdev, indio_dev);
|
|
|
|
ret = lp8788_iio_map_register(indio_dev, lp->pdata, adc);
|
|
if (ret)
|
|
goto err_iio_map;
|
|
|
|
mutex_init(&adc->lock);
|
|
|
|
indio_dev->dev.parent = lp->dev;
|
|
indio_dev->name = pdev->name;
|
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
|
indio_dev->info = &lp8788_adc_info;
|
|
indio_dev->channels = lp8788_adc_channels;
|
|
indio_dev->num_channels = ARRAY_SIZE(lp8788_adc_channels);
|
|
|
|
ret = iio_device_register(indio_dev);
|
|
if (ret) {
|
|
dev_err(lp->dev, "iio dev register err: %d\n", ret);
|
|
goto err_iio_device;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_iio_device:
|
|
lp8788_iio_map_unregister(indio_dev, adc);
|
|
err_iio_map:
|
|
iio_device_free(indio_dev);
|
|
return ret;
|
|
}
|
|
|
|
static int __devexit lp8788_adc_remove(struct platform_device *pdev)
|
|
{
|
|
struct iio_dev *indio_dev = platform_get_drvdata(pdev);
|
|
struct lp8788_adc *adc = iio_priv(indio_dev);
|
|
|
|
iio_device_unregister(indio_dev);
|
|
lp8788_iio_map_unregister(indio_dev, adc);
|
|
iio_device_free(indio_dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver lp8788_adc_driver = {
|
|
.probe = lp8788_adc_probe,
|
|
.remove = __devexit_p(lp8788_adc_remove),
|
|
.driver = {
|
|
.name = LP8788_DEV_ADC,
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|
|
module_platform_driver(lp8788_adc_driver);
|
|
|
|
MODULE_DESCRIPTION("Texas Instruments LP8788 ADC Driver");
|
|
MODULE_AUTHOR("Milo Kim");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:lp8788-adc");
|