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83d290c56f
u-boot/drivers/adc/adc-uclass.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style 
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

405 lines
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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2015 Samsung Electronics
* Przemyslaw Marczak <p.marczak@samsung.com>
*/
#include <common.h>
#include <errno.h>
#include <dm.h>
#include <dm/lists.h>
#include <dm/device-internal.h>
#include <dm/uclass-internal.h>
#include <adc.h>
#include <power/regulator.h>
#define ADC_UCLASS_PLATDATA_SIZE sizeof(struct adc_uclass_platdata)
#define CHECK_NUMBER true
#define CHECK_MASK (!CHECK_NUMBER)
/* TODO: add support for timer uclass (for early calls) */
#ifdef CONFIG_SANDBOX_ARCH
#define sdelay(x) udelay(x)
#else
extern void sdelay(unsigned long loops);
#endif
static int check_channel(struct udevice *dev, int value, bool number_or_mask,
const char *caller_function)
{
struct adc_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev);
unsigned mask = number_or_mask ? (1 << value) : value;
/* For the real ADC hardware, some ADC channels can be inactive.
* For example if device has 4 analog channels, and only channels
* 1-st and 3-rd are valid, then channel mask is: 0b1010, so request
* with mask 0b1110 should return an error.
*/
if ((uc_pdata->channel_mask >= mask) && (uc_pdata->channel_mask & mask))
return 0;
printf("Error in %s/%s().\nWrong channel selection for device: %s\n",
__FILE__, caller_function, dev->name);
return -EINVAL;
}
static int adc_supply_enable(struct udevice *dev)
{
struct adc_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev);
const char *supply_type;
int ret = 0;
if (uc_pdata->vdd_supply) {
supply_type = "vdd";
ret = regulator_set_enable(uc_pdata->vdd_supply, true);
}
if (!ret && uc_pdata->vss_supply) {
supply_type = "vss";
ret = regulator_set_enable(uc_pdata->vss_supply, true);
}
if (ret)
pr_err("%s: can't enable %s-supply!", dev->name, supply_type);
return ret;
}
int adc_data_mask(struct udevice *dev, unsigned int *data_mask)
{
struct adc_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev);
if (!uc_pdata)
return -ENOSYS;
*data_mask = uc_pdata->data_mask;
return 0;
}
int adc_stop(struct udevice *dev)
{
const struct adc_ops *ops = dev_get_driver_ops(dev);
if (!ops->stop)
return -ENOSYS;
return ops->stop(dev);
}
int adc_start_channel(struct udevice *dev, int channel)
{
const struct adc_ops *ops = dev_get_driver_ops(dev);
int ret;
if (!ops->start_channel)
return -ENOSYS;
ret = check_channel(dev, channel, CHECK_NUMBER, __func__);
if (ret)
return ret;
ret = adc_supply_enable(dev);
if (ret)
return ret;
return ops->start_channel(dev, channel);
}
int adc_start_channels(struct udevice *dev, unsigned int channel_mask)
{
const struct adc_ops *ops = dev_get_driver_ops(dev);
int ret;
if (!ops->start_channels)
return -ENOSYS;
ret = check_channel(dev, channel_mask, CHECK_MASK, __func__);
if (ret)
return ret;
ret = adc_supply_enable(dev);
if (ret)
return ret;
return ops->start_channels(dev, channel_mask);
}
int adc_channel_data(struct udevice *dev, int channel, unsigned int *data)
{
struct adc_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev);
const struct adc_ops *ops = dev_get_driver_ops(dev);
unsigned int timeout_us = uc_pdata->data_timeout_us;
int ret;
if (!ops->channel_data)
return -ENOSYS;
ret = check_channel(dev, channel, CHECK_NUMBER, __func__);
if (ret)
return ret;
do {
ret = ops->channel_data(dev, channel, data);
if (!ret || ret != -EBUSY)
break;
/* TODO: use timer uclass (for early calls). */
sdelay(5);
} while (timeout_us--);
return ret;
}
int adc_channels_data(struct udevice *dev, unsigned int channel_mask,
struct adc_channel *channels)
{
struct adc_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev);
unsigned int timeout_us = uc_pdata->multidata_timeout_us;
const struct adc_ops *ops = dev_get_driver_ops(dev);
int ret;
if (!ops->channels_data)
return -ENOSYS;
ret = check_channel(dev, channel_mask, CHECK_MASK, __func__);
if (ret)
return ret;
do {
ret = ops->channels_data(dev, channel_mask, channels);
if (!ret || ret != -EBUSY)
break;
/* TODO: use timer uclass (for early calls). */
sdelay(5);
} while (timeout_us--);
return ret;
}
int adc_channel_single_shot(const char *name, int channel, unsigned int *data)
{
struct udevice *dev;
int ret;
ret = uclass_get_device_by_name(UCLASS_ADC, name, &dev);
if (ret)
return ret;
ret = adc_start_channel(dev, channel);
if (ret)
return ret;
ret = adc_channel_data(dev, channel, data);
if (ret)
return ret;
return 0;
}
static int _adc_channels_single_shot(struct udevice *dev,
unsigned int channel_mask,
struct adc_channel *channels)
{
unsigned int data;
int channel, ret;
for (channel = 0; channel <= ADC_MAX_CHANNEL; channel++) {
/* Check channel bit. */
if (!((channel_mask >> channel) & 0x1))
continue;
ret = adc_start_channel(dev, channel);
if (ret)
return ret;
ret = adc_channel_data(dev, channel, &data);
if (ret)
return ret;
channels->id = channel;
channels->data = data;
channels++;
}
return 0;
}
int adc_channels_single_shot(const char *name, unsigned int channel_mask,
struct adc_channel *channels)
{
struct udevice *dev;
int ret;
ret = uclass_get_device_by_name(UCLASS_ADC, name, &dev);
if (ret)
return ret;
ret = adc_start_channels(dev, channel_mask);
if (ret)
goto try_manual;
ret = adc_channels_data(dev, channel_mask, channels);
if (ret)
return ret;
return 0;
try_manual:
if (ret != -ENOSYS)
return ret;
return _adc_channels_single_shot(dev, channel_mask, channels);
}
static int adc_vdd_platdata_update(struct udevice *dev)
{
struct adc_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev);
int ret;
/* Warning!
* This function can't return supply device before its bind.
* Please pay attention to proper fdt scan sequence. If ADC device
* will bind before its supply regulator device, then the below 'get'
* will return an error.
*/
ret = device_get_supply_regulator(dev, "vdd-supply",
&uc_pdata->vdd_supply);
if (ret)
return ret;
ret = regulator_get_value(uc_pdata->vdd_supply);
if (ret < 0)
return ret;
uc_pdata->vdd_microvolts = ret;
return 0;
}
static int adc_vss_platdata_update(struct udevice *dev)
{
struct adc_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev);
int ret;
ret = device_get_supply_regulator(dev, "vss-supply",
&uc_pdata->vss_supply);
if (ret)
return ret;
ret = regulator_get_value(uc_pdata->vss_supply);
if (ret < 0)
return ret;
uc_pdata->vss_microvolts = ret;
return 0;
}
int adc_vdd_value(struct udevice *dev, int *uV)
{
struct adc_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev);
int ret, value_sign = uc_pdata->vdd_polarity_negative ? -1 : 1;
if (!uc_pdata->vdd_supply)
goto nodev;
/* Update the regulator Value. */
ret = adc_vdd_platdata_update(dev);
if (ret)
return ret;
nodev:
if (uc_pdata->vdd_microvolts == -ENODATA)
return -ENODATA;
*uV = uc_pdata->vdd_microvolts * value_sign;
return 0;
}
int adc_vss_value(struct udevice *dev, int *uV)
{
struct adc_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev);
int ret, value_sign = uc_pdata->vss_polarity_negative ? -1 : 1;
if (!uc_pdata->vss_supply)
goto nodev;
/* Update the regulator Value. */
ret = adc_vss_platdata_update(dev);
if (ret)
return ret;
nodev:
if (uc_pdata->vss_microvolts == -ENODATA)
return -ENODATA;
*uV = uc_pdata->vss_microvolts * value_sign;
return 0;
}
static int adc_vdd_platdata_set(struct udevice *dev)
{
struct adc_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev);
int ret;
char *prop;
prop = "vdd-polarity-negative";
uc_pdata->vdd_polarity_negative = dev_read_bool(dev, prop);
ret = adc_vdd_platdata_update(dev);
if (ret != -ENOENT)
return ret;
/* No vdd-supply phandle. */
prop = "vdd-microvolts";
uc_pdata->vdd_microvolts = dev_read_u32_default(dev, prop, -ENODATA);
return 0;
}
static int adc_vss_platdata_set(struct udevice *dev)
{
struct adc_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev);
int ret;
char *prop;
prop = "vss-polarity-negative";
uc_pdata->vss_polarity_negative = dev_read_bool(dev, prop);
ret = adc_vss_platdata_update(dev);
if (ret != -ENOENT)
return ret;
/* No vss-supply phandle. */
prop = "vss-microvolts";
uc_pdata->vss_microvolts = dev_read_u32_default(dev, prop, -ENODATA);
return 0;
}
static int adc_pre_probe(struct udevice *dev)
{
int ret;
/* Set ADC VDD platdata: polarity, uV, regulator (phandle). */
ret = adc_vdd_platdata_set(dev);
if (ret)
pr_err("%s: Can't update Vdd. Error: %d", dev->name, ret);
/* Set ADC VSS platdata: polarity, uV, regulator (phandle). */
ret = adc_vss_platdata_set(dev);
if (ret)
pr_err("%s: Can't update Vss. Error: %d", dev->name, ret);
return 0;
}
UCLASS_DRIVER(adc) = {
.id = UCLASS_ADC,
.name = "adc",
.pre_probe = adc_pre_probe,
.per_device_platdata_auto_alloc_size = ADC_UCLASS_PLATDATA_SIZE,
};
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