408 lines
10 KiB
C
408 lines
10 KiB
C
|
/*
|
||
|
|
* DA9150 GPADC Driver
|
||
|
|
*
|
||
|
|
* Copyright (c) 2014 Dialog Semiconductor
|
||
|
|
*
|
||
|
|
* Author: Adam Thomson <Adam.Thomson.Opensource@diasemi.com>
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify it
|
||
|
|
* under the terms of the GNU General Public License as published by the
|
||
|
|
* Free Software Foundation; either version 2 of the License, or (at your
|
||
|
|
* option) any later version.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/kernel.h>
|
||
|
|
#include <linux/slab.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/platform_device.h>
|
||
|
|
#include <linux/interrupt.h>
|
||
|
|
#include <linux/mutex.h>
|
||
|
|
#include <linux/completion.h>
|
||
|
|
#include <linux/iio/iio.h>
|
||
|
|
#include <linux/iio/machine.h>
|
||
|
|
#include <linux/iio/driver.h>
|
||
|
|
#include <linux/mfd/da9150/core.h>
|
||
|
|
#include <linux/mfd/da9150/registers.h>
|
||
|
|
|
||
|
|
/* Channels */
|
||
|
|
enum da9150_gpadc_hw_channel {
|
||
|
|
DA9150_GPADC_HW_CHAN_GPIOA_2V = 0,
|
||
|
|
DA9150_GPADC_HW_CHAN_GPIOA_2V_,
|
||
|
|
DA9150_GPADC_HW_CHAN_GPIOB_2V,
|
||
|
|
DA9150_GPADC_HW_CHAN_GPIOB_2V_,
|
||
|
|
DA9150_GPADC_HW_CHAN_GPIOC_2V,
|
||
|
|
DA9150_GPADC_HW_CHAN_GPIOC_2V_,
|
||
|
|
DA9150_GPADC_HW_CHAN_GPIOD_2V,
|
||
|
|
DA9150_GPADC_HW_CHAN_GPIOD_2V_,
|
||
|
|
DA9150_GPADC_HW_CHAN_IBUS_SENSE,
|
||
|
|
DA9150_GPADC_HW_CHAN_IBUS_SENSE_,
|
||
|
|
DA9150_GPADC_HW_CHAN_VBUS_DIV,
|
||
|
|
DA9150_GPADC_HW_CHAN_VBUS_DIV_,
|
||
|
|
DA9150_GPADC_HW_CHAN_ID,
|
||
|
|
DA9150_GPADC_HW_CHAN_ID_,
|
||
|
|
DA9150_GPADC_HW_CHAN_VSYS,
|
||
|
|
DA9150_GPADC_HW_CHAN_VSYS_,
|
||
|
|
DA9150_GPADC_HW_CHAN_GPIOA_6V,
|
||
|
|
DA9150_GPADC_HW_CHAN_GPIOA_6V_,
|
||
|
|
DA9150_GPADC_HW_CHAN_GPIOB_6V,
|
||
|
|
DA9150_GPADC_HW_CHAN_GPIOB_6V_,
|
||
|
|
DA9150_GPADC_HW_CHAN_GPIOC_6V,
|
||
|
|
DA9150_GPADC_HW_CHAN_GPIOC_6V_,
|
||
|
|
DA9150_GPADC_HW_CHAN_GPIOD_6V,
|
||
|
|
DA9150_GPADC_HW_CHAN_GPIOD_6V_,
|
||
|
|
DA9150_GPADC_HW_CHAN_VBAT,
|
||
|
|
DA9150_GPADC_HW_CHAN_VBAT_,
|
||
|
|
DA9150_GPADC_HW_CHAN_TBAT,
|
||
|
|
DA9150_GPADC_HW_CHAN_TBAT_,
|
||
|
|
DA9150_GPADC_HW_CHAN_TJUNC_CORE,
|
||
|
|
DA9150_GPADC_HW_CHAN_TJUNC_CORE_,
|
||
|
|
DA9150_GPADC_HW_CHAN_TJUNC_OVP,
|
||
|
|
DA9150_GPADC_HW_CHAN_TJUNC_OVP_,
|
||
|
|
};
|
||
|
|
|
||
|
|
enum da9150_gpadc_channel {
|
||
|
|
DA9150_GPADC_CHAN_GPIOA = 0,
|
||
|
|
DA9150_GPADC_CHAN_GPIOB,
|
||
|
|
DA9150_GPADC_CHAN_GPIOC,
|
||
|
|
DA9150_GPADC_CHAN_GPIOD,
|
||
|
|
DA9150_GPADC_CHAN_IBUS,
|
||
|
|
DA9150_GPADC_CHAN_VBUS,
|
||
|
|
DA9150_GPADC_CHAN_VSYS,
|
||
|
|
DA9150_GPADC_CHAN_VBAT,
|
||
|
|
DA9150_GPADC_CHAN_TBAT,
|
||
|
|
DA9150_GPADC_CHAN_TJUNC_CORE,
|
||
|
|
DA9150_GPADC_CHAN_TJUNC_OVP,
|
||
|
|
};
|
||
|
|
|
||
|
|
/* Private data */
|
||
|
|
struct da9150_gpadc {
|
||
|
|
struct da9150 *da9150;
|
||
|
|
struct device *dev;
|
||
|
|
|
||
|
|
struct mutex lock;
|
||
|
|
struct completion complete;
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
static irqreturn_t da9150_gpadc_irq(int irq, void *data)
|
||
|
|
{
|
||
|
|
|
||
|
|
struct da9150_gpadc *gpadc = data;
|
||
|
|
|
||
|
|
complete(&gpadc->complete);
|
||
|
|
|
||
|
|
return IRQ_HANDLED;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int da9150_gpadc_read_adc(struct da9150_gpadc *gpadc, int hw_chan)
|
||
|
|
{
|
||
|
|
u8 result_regs[2];
|
||
|
|
int result;
|
||
|
|
|
||
|
|
mutex_lock(&gpadc->lock);
|
||
|
|
|
||
|
|
/* Set channel & enable measurement */
|
||
|
|
da9150_reg_write(gpadc->da9150, DA9150_GPADC_MAN,
|
||
|
|
(DA9150_GPADC_EN_MASK |
|
||
|
|
hw_chan << DA9150_GPADC_MUX_SHIFT));
|
||
|
|
|
||
|
|
/* Consume left-over completion from a previous timeout */
|
||
|
|
try_wait_for_completion(&gpadc->complete);
|
||
|
|
|
||
|
|
/* Check for actual completion */
|
||
|
|
wait_for_completion_timeout(&gpadc->complete, msecs_to_jiffies(5));
|
||
|
|
|
||
|
|
/* Read result and status from device */
|
||
|
|
da9150_bulk_read(gpadc->da9150, DA9150_GPADC_RES_A, 2, result_regs);
|
||
|
|
|
||
|
|
mutex_unlock(&gpadc->lock);
|
||
|
|
|
||
|
|
/* Check to make sure device really has completed reading */
|
||
|
|
if (result_regs[1] & DA9150_GPADC_RUN_MASK) {
|
||
|
|
dev_err(gpadc->dev, "Timeout on channel %d of GPADC\n",
|
||
|
|
hw_chan);
|
||
|
|
return -ETIMEDOUT;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* LSBs - 2 bits */
|
||
|
|
result = (result_regs[1] & DA9150_GPADC_RES_L_MASK) >>
|
||
|
|
DA9150_GPADC_RES_L_SHIFT;
|
||
|
|
/* MSBs - 8 bits */
|
||
|
|
result |= result_regs[0] << DA9150_GPADC_RES_L_BITS;
|
||
|
|
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int da9150_gpadc_gpio_6v_voltage_now(int raw_val)
|
||
|
|
{
|
||
|
|
/* Convert to mV */
|
||
|
|
return (6 * ((raw_val * 1000) + 500)) / 1024;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int da9150_gpadc_ibus_current_avg(int raw_val)
|
||
|
|
{
|
||
|
|
/* Convert to mA */
|
||
|
|
return (4 * ((raw_val * 1000) + 500)) / 2048;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int da9150_gpadc_vbus_21v_voltage_now(int raw_val)
|
||
|
|
{
|
||
|
|
/* Convert to mV */
|
||
|
|
return (21 * ((raw_val * 1000) + 500)) / 1024;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int da9150_gpadc_vsys_6v_voltage_now(int raw_val)
|
||
|
|
{
|
||
|
|
/* Convert to mV */
|
||
|
|
return (3 * ((raw_val * 1000) + 500)) / 512;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int da9150_gpadc_read_processed(struct da9150_gpadc *gpadc, int channel,
|
||
|
|
int hw_chan, int *val)
|
||
|
|
{
|
||
|
|
int raw_val;
|
||
|
|
|
||
|
|
raw_val = da9150_gpadc_read_adc(gpadc, hw_chan);
|
||
|
|
if (raw_val < 0)
|
||
|
|
return raw_val;
|
||
|
|
|
||
|
|
switch (channel) {
|
||
|
|
case DA9150_GPADC_CHAN_GPIOA:
|
||
|
|
case DA9150_GPADC_CHAN_GPIOB:
|
||
|
|
case DA9150_GPADC_CHAN_GPIOC:
|
||
|
|
case DA9150_GPADC_CHAN_GPIOD:
|
||
|
|
*val = da9150_gpadc_gpio_6v_voltage_now(raw_val);
|
||
|
|
break;
|
||
|
|
case DA9150_GPADC_CHAN_IBUS:
|
||
|
|
*val = da9150_gpadc_ibus_current_avg(raw_val);
|
||
|
|
break;
|
||
|
|
case DA9150_GPADC_CHAN_VBUS:
|
||
|
|
*val = da9150_gpadc_vbus_21v_voltage_now(raw_val);
|
||
|
|
break;
|
||
|
|
case DA9150_GPADC_CHAN_VSYS:
|
||
|
|
*val = da9150_gpadc_vsys_6v_voltage_now(raw_val);
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
/* No processing for other channels so return raw value */
|
||
|
|
*val = raw_val;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
return IIO_VAL_INT;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int da9150_gpadc_read_scale(int channel, int *val, int *val2)
|
||
|
|
{
|
||
|
|
switch (channel) {
|
||
|
|
case DA9150_GPADC_CHAN_VBAT:
|
||
|
|
*val = 2932;
|
||
|
|
*val2 = 1000;
|
||
|
|
return IIO_VAL_FRACTIONAL;
|
||
|
|
case DA9150_GPADC_CHAN_TJUNC_CORE:
|
||
|
|
case DA9150_GPADC_CHAN_TJUNC_OVP:
|
||
|
|
*val = 1000000;
|
||
|
|
*val2 = 4420;
|
||
|
|
return IIO_VAL_FRACTIONAL;
|
||
|
|
default:
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static int da9150_gpadc_read_offset(int channel, int *val)
|
||
|
|
{
|
||
|
|
switch (channel) {
|
||
|
|
case DA9150_GPADC_CHAN_VBAT:
|
||
|
|
*val = 1500000 / 2932;
|
||
|
|
return IIO_VAL_INT;
|
||
|
|
case DA9150_GPADC_CHAN_TJUNC_CORE:
|
||
|
|
case DA9150_GPADC_CHAN_TJUNC_OVP:
|
||
|
|
*val = -144;
|
||
|
|
return IIO_VAL_INT;
|
||
|
|
default:
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static int da9150_gpadc_read_raw(struct iio_dev *indio_dev,
|
||
|
|
struct iio_chan_spec const *chan,
|
||
|
|
int *val, int *val2, long mask)
|
||
|
|
{
|
||
|
|
struct da9150_gpadc *gpadc = iio_priv(indio_dev);
|
||
|
|
|
||
|
|
if ((chan->channel < DA9150_GPADC_CHAN_GPIOA) ||
|
||
|
|
(chan->channel > DA9150_GPADC_CHAN_TJUNC_OVP))
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
switch (mask) {
|
||
|
|
case IIO_CHAN_INFO_RAW:
|
||
|
|
case IIO_CHAN_INFO_PROCESSED:
|
||
|
|
return da9150_gpadc_read_processed(gpadc, chan->channel,
|
||
|
|
chan->address, val);
|
||
|
|
case IIO_CHAN_INFO_SCALE:
|
||
|
|
return da9150_gpadc_read_scale(chan->channel, val, val2);
|
||
|
|
case IIO_CHAN_INFO_OFFSET:
|
||
|
|
return da9150_gpadc_read_offset(chan->channel, val);
|
||
|
|
default:
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct iio_info da9150_gpadc_info = {
|
||
|
|
.read_raw = &da9150_gpadc_read_raw,
|
||
|
|
.driver_module = THIS_MODULE,
|
||
|
|
};
|
||
|
|
|
||
|
|
#define DA9150_GPADC_CHANNEL(_id, _hw_id, _type, chan_info, \
|
||
|
|
_ext_name) { \
|
||
|
|
.type = _type, \
|
||
|
|
.indexed = 1, \
|
||
|
|
.channel = DA9150_GPADC_CHAN_##_id, \
|
||
|
|
.address = DA9150_GPADC_HW_CHAN_##_hw_id, \
|
||
|
|
.info_mask_separate = chan_info, \
|
||
|
|
.extend_name = _ext_name, \
|
||
|
|
.datasheet_name = #_id, \
|
||
|
|
}
|
||
|
|
|
||
|
|
#define DA9150_GPADC_CHANNEL_RAW(_id, _hw_id, _type, _ext_name) \
|
||
|
|
DA9150_GPADC_CHANNEL(_id, _hw_id, _type, \
|
||
|
|
BIT(IIO_CHAN_INFO_RAW), _ext_name)
|
||
|
|
|
||
|
|
#define DA9150_GPADC_CHANNEL_SCALED(_id, _hw_id, _type, _ext_name) \
|
||
|
|
DA9150_GPADC_CHANNEL(_id, _hw_id, _type, \
|
||
|
|
BIT(IIO_CHAN_INFO_RAW) | \
|
||
|
|
BIT(IIO_CHAN_INFO_SCALE) | \
|
||
|
|
BIT(IIO_CHAN_INFO_OFFSET), \
|
||
|
|
_ext_name)
|
||
|
|
|
||
|
|
#define DA9150_GPADC_CHANNEL_PROCESSED(_id, _hw_id, _type, _ext_name) \
|
||
|
|
DA9150_GPADC_CHANNEL(_id, _hw_id, _type, \
|
||
|
|
BIT(IIO_CHAN_INFO_PROCESSED), _ext_name)
|
||
|
|
|
||
|
|
/* Supported channels */
|
||
|
|
static const struct iio_chan_spec da9150_gpadc_channels[] = {
|
||
|
|
DA9150_GPADC_CHANNEL_PROCESSED(GPIOA, GPIOA_6V, IIO_VOLTAGE, NULL),
|
||
|
|
DA9150_GPADC_CHANNEL_PROCESSED(GPIOB, GPIOB_6V, IIO_VOLTAGE, NULL),
|
||
|
|
DA9150_GPADC_CHANNEL_PROCESSED(GPIOC, GPIOC_6V, IIO_VOLTAGE, NULL),
|
||
|
|
DA9150_GPADC_CHANNEL_PROCESSED(GPIOD, GPIOD_6V, IIO_VOLTAGE, NULL),
|
||
|
|
DA9150_GPADC_CHANNEL_PROCESSED(IBUS, IBUS_SENSE, IIO_CURRENT, "ibus"),
|
||
|
|
DA9150_GPADC_CHANNEL_PROCESSED(VBUS, VBUS_DIV_, IIO_VOLTAGE, "vbus"),
|
||
|
|
DA9150_GPADC_CHANNEL_PROCESSED(VSYS, VSYS, IIO_VOLTAGE, "vsys"),
|
||
|
|
DA9150_GPADC_CHANNEL_SCALED(VBAT, VBAT, IIO_VOLTAGE, "vbat"),
|
||
|
|
DA9150_GPADC_CHANNEL_RAW(TBAT, TBAT, IIO_VOLTAGE, "tbat"),
|
||
|
|
DA9150_GPADC_CHANNEL_SCALED(TJUNC_CORE, TJUNC_CORE, IIO_TEMP,
|
||
|
|
"tjunc_core"),
|
||
|
|
DA9150_GPADC_CHANNEL_SCALED(TJUNC_OVP, TJUNC_OVP, IIO_TEMP,
|
||
|
|
"tjunc_ovp"),
|
||
|
|
};
|
||
|
|
|
||
|
|
/* Default maps used by da9150-charger */
|
||
|
|
static struct iio_map da9150_gpadc_default_maps[] = {
|
||
|
|
{
|
||
|
|
.consumer_dev_name = "da9150-charger",
|
||
|
|
.consumer_channel = "CHAN_IBUS",
|
||
|
|
.adc_channel_label = "IBUS",
|
||
|
|
},
|
||
|
|
{
|
||
|
|
.consumer_dev_name = "da9150-charger",
|
||
|
|
.consumer_channel = "CHAN_VBUS",
|
||
|
|
.adc_channel_label = "VBUS",
|
||
|
|
},
|
||
|
|
{
|
||
|
|
.consumer_dev_name = "da9150-charger",
|
||
|
|
.consumer_channel = "CHAN_TJUNC",
|
||
|
|
.adc_channel_label = "TJUNC_CORE",
|
||
|
|
},
|
||
|
|
{
|
||
|
|
.consumer_dev_name = "da9150-charger",
|
||
|
|
.consumer_channel = "CHAN_VBAT",
|
||
|
|
.adc_channel_label = "VBAT",
|
||
|
|
},
|
||
|
|
{},
|
||
|
|
};
|
||
|
|
|
||
|
|
static int da9150_gpadc_probe(struct platform_device *pdev)
|
||
|
|
{
|
||
|
|
struct device *dev = &pdev->dev;
|
||
|
|
struct da9150 *da9150 = dev_get_drvdata(dev->parent);
|
||
|
|
struct da9150_gpadc *gpadc;
|
||
|
|
struct iio_dev *indio_dev;
|
||
|
|
int irq, ret;
|
||
|
|
|
||
|
|
indio_dev = devm_iio_device_alloc(dev, sizeof(*gpadc));
|
||
|
|
if (!indio_dev) {
|
||
|
|
dev_err(&pdev->dev, "Failed to allocate IIO device\n");
|
||
|
|
return -ENOMEM;
|
||
|
|
}
|
||
|
|
gpadc = iio_priv(indio_dev);
|
||
|
|
|
||
|
|
platform_set_drvdata(pdev, indio_dev);
|
||
|
|
gpadc->da9150 = da9150;
|
||
|
|
gpadc->dev = dev;
|
||
|
|
mutex_init(&gpadc->lock);
|
||
|
|
init_completion(&gpadc->complete);
|
||
|
|
|
||
|
|
irq = platform_get_irq_byname(pdev, "GPADC");
|
||
|
|
if (irq < 0) {
|
||
|
|
dev_err(dev, "Failed to get IRQ: %d\n", irq);
|
||
|
|
return irq;
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = devm_request_threaded_irq(dev, irq, NULL, da9150_gpadc_irq,
|
||
|
|
IRQF_ONESHOT, "GPADC", gpadc);
|
||
|
|
if (ret) {
|
||
|
|
dev_err(dev, "Failed to request IRQ %d: %d\n", irq, ret);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = iio_map_array_register(indio_dev, da9150_gpadc_default_maps);
|
||
|
|
if (ret) {
|
||
|
|
dev_err(dev, "Failed to register IIO maps: %d\n", ret);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
indio_dev->name = dev_name(dev);
|
||
|
|
indio_dev->dev.parent = dev;
|
||
|
|
indio_dev->dev.of_node = pdev->dev.of_node;
|
||
|
|
indio_dev->info = &da9150_gpadc_info;
|
||
|
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
||
|
|
indio_dev->channels = da9150_gpadc_channels;
|
||
|
|
indio_dev->num_channels = ARRAY_SIZE(da9150_gpadc_channels);
|
||
|
|
|
||
|
|
ret = iio_device_register(indio_dev);
|
||
|
|
if (ret) {
|
||
|
|
dev_err(dev, "Failed to register IIO device: %d\n", ret);
|
||
|
|
goto iio_map_unreg;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
iio_map_unreg:
|
||
|
|
iio_map_array_unregister(indio_dev);
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int da9150_gpadc_remove(struct platform_device *pdev)
|
||
|
|
{
|
||
|
|
struct iio_dev *indio_dev = platform_get_drvdata(pdev);
|
||
|
|
|
||
|
|
iio_device_unregister(indio_dev);
|
||
|
|
iio_map_array_unregister(indio_dev);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct platform_driver da9150_gpadc_driver = {
|
||
|
|
.driver = {
|
||
|
|
.name = "da9150-gpadc",
|
||
|
|
},
|
||
|
|
.probe = da9150_gpadc_probe,
|
||
|
|
.remove = da9150_gpadc_remove,
|
||
|
|
};
|
||
|
|
|
||
|
|
module_platform_driver(da9150_gpadc_driver);
|
||
|
|
|
||
|
|
MODULE_DESCRIPTION("GPADC Driver for DA9150");
|
||
|
|
MODULE_AUTHOR("Adam Thomson <Adam.Thomson.Opensource@diasemi.com>");
|
||
|
|
MODULE_LICENSE("GPL");
|