Commit 08d6300a authored by Przemyslaw Marczak's avatar Przemyslaw Marczak Committed by Minkyu Kang

sandbox: add ADC driver

This commit adds implementation of Sandbox ADC device emulation.
The device provides:
- single and multi-channel conversion
- 4 channels with predefined conversion output data
- 16-bit resolution
Signed-off-by: default avatarPrzemyslaw Marczak <p.marczak@samsung.com>
Cc: Simon Glass <sjg@chromium.org>
Signed-off-by: default avatarMinkyu Kang <mk7.kang@samsung.com>
parent 1611c8cb
......@@ -55,7 +55,7 @@
regulator-always-on;
};
buck2 {
buck2: buck2 {
regulator-name = "SUPPLY_3.3V";
regulator-min-microvolt = <3300000>;
regulator-max-microvolt = <3300000>;
......
......@@ -189,6 +189,12 @@
};
};
adc@0 {
compatible = "sandbox,adc";
vdd-supply = <&buck2>;
vss-microvolts = <0>;
};
leds {
compatible = "gpio-leds";
......
......@@ -65,3 +65,5 @@ CONFIG_UT_DM=y
CONFIG_UT_ENV=y
CONFIG_REMOTEPROC_SANDBOX=y
CONFIG_CMD_REMOTEPROC=y
CONFIG_ADC=y
CONFIG_ADC_SANDBOX=y
......@@ -19,3 +19,12 @@ config ADC_EXYNOS
- 10 analog input channels
- 12-bit resolution
- 600 KSPS of sample rate
config ADC_SANDBOX
bool "Enable Sandbox ADC test driver"
help
This enables driver for Sandbox ADC device emulation.
It provides:
- 4 analog input channels
- 16-bit resolution
- single and multi-channel conversion mode
......@@ -7,3 +7,4 @@
obj-$(CONFIG_ADC) += adc-uclass.o
obj-$(CONFIG_ADC_EXYNOS) += exynos-adc.o
obj-$(CONFIG_ADC_SANDBOX) += sandbox.o
/*
* Copyright (C) 2015 Samsung Electronics
* Przemyslaw Marczak <p.marczak@samsung.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <errno.h>
#include <dm.h>
#include <adc.h>
#include <sandbox-adc.h>
/**
* struct sandbox_adc_priv - sandbox ADC device's operation status and data
*
* @conversion_status - conversion status: ACTIVE (started) / INACTIVE (stopped)
* @conversion_mode - conversion mode: single or multi-channel
* @active_channel - active channel number, valid for single channel mode
* data[] - channels data
*/
struct sandbox_adc_priv {
int conversion_status;
int conversion_mode;
int active_channel_mask;
unsigned int data[4];
};
int sandbox_adc_start_channel(struct udevice *dev, int channel)
{
struct sandbox_adc_priv *priv = dev_get_priv(dev);
/* Set single-channel mode */
priv->conversion_mode = SANDBOX_ADC_MODE_SINGLE_CHANNEL;
/* Select channel */
priv->active_channel_mask = 1 << channel;
/* Start conversion */
priv->conversion_status = SANDBOX_ADC_ACTIVE;
return 0;
}
int sandbox_adc_start_channels(struct udevice *dev, unsigned int channel_mask)
{
struct sandbox_adc_priv *priv = dev_get_priv(dev);
/* Set single-channel mode */
priv->conversion_mode = SANDBOX_ADC_MODE_MULTI_CHANNEL;
/* Select channel */
priv->active_channel_mask = channel_mask;
/* Start conversion */
priv->conversion_status = SANDBOX_ADC_ACTIVE;
return 0;
}
int sandbox_adc_channel_data(struct udevice *dev, int channel,
unsigned int *data)
{
struct sandbox_adc_priv *priv = dev_get_priv(dev);
/* For single-channel conversion mode, check if channel was selected */
if ((priv->conversion_mode == SANDBOX_ADC_MODE_SINGLE_CHANNEL) &&
!(priv->active_channel_mask & (1 << channel))) {
error("Request for an inactive channel!");
return -EINVAL;
}
/* The conversion must be started before reading the data */
if (priv->conversion_status == SANDBOX_ADC_INACTIVE)
return -EIO;
*data = priv->data[channel];
return 0;
}
int sandbox_adc_channels_data(struct udevice *dev, unsigned int channel_mask,
struct adc_channel *channels)
{
struct sandbox_adc_priv *priv = dev_get_priv(dev);
int i;
/* Return error for single-channel conversion mode */
if (priv->conversion_mode == SANDBOX_ADC_MODE_SINGLE_CHANNEL) {
error("ADC in single-channel mode!");
return -EPERM;
}
/* Check channel selection */
if (!(priv->active_channel_mask & channel_mask)) {
error("Request for an inactive channel!");
return -EINVAL;
}
/* The conversion must be started before reading the data */
if (priv->conversion_status == SANDBOX_ADC_INACTIVE)
return -EIO;
for (i = 0; i < SANDBOX_ADC_CHANNELS; i++) {
if (!((channel_mask >> i) & 0x1))
continue;
channels->data = priv->data[i];
channels->id = i;
channels++;
}
return 0;
}
int sandbox_adc_stop(struct udevice *dev)
{
struct sandbox_adc_priv *priv = dev_get_priv(dev);
/* Start conversion */
priv->conversion_status = SANDBOX_ADC_INACTIVE;
return 0;
}
int sandbox_adc_probe(struct udevice *dev)
{
struct sandbox_adc_priv *priv = dev_get_priv(dev);
/* Stop conversion */
priv->conversion_status = SANDBOX_ADC_INACTIVE;
/* Set single-channel mode */
priv->conversion_mode = SANDBOX_ADC_MODE_SINGLE_CHANNEL;
/* Deselect all channels */
priv->active_channel_mask = 0;
/* Set sandbox test data */
priv->data[0] = SANDBOX_ADC_CHANNEL0_DATA;
priv->data[1] = SANDBOX_ADC_CHANNEL1_DATA;
priv->data[2] = SANDBOX_ADC_CHANNEL2_DATA;
priv->data[3] = SANDBOX_ADC_CHANNEL3_DATA;
return 0;
}
int sandbox_adc_ofdata_to_platdata(struct udevice *dev)
{
struct adc_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev);
uc_pdata->data_mask = SANDBOX_ADC_DATA_MASK;
uc_pdata->data_format = ADC_DATA_FORMAT_BIN;
uc_pdata->data_timeout_us = 0;
/* Mask available channel bits: [0:3] */
uc_pdata->channel_mask = (1 << SANDBOX_ADC_CHANNELS) - 1;
return 0;
}
static const struct adc_ops sandbox_adc_ops = {
.start_channel = sandbox_adc_start_channel,
.start_channels = sandbox_adc_start_channels,
.channel_data = sandbox_adc_channel_data,
.channels_data = sandbox_adc_channels_data,
.stop = sandbox_adc_stop,
};
static const struct udevice_id sandbox_adc_ids[] = {
{ .compatible = "sandbox,adc" },
{ }
};
U_BOOT_DRIVER(sandbox_adc) = {
.name = "sandbox-adc",
.id = UCLASS_ADC,
.of_match = sandbox_adc_ids,
.ops = &sandbox_adc_ops,
.probe = sandbox_adc_probe,
.ofdata_to_platdata = sandbox_adc_ofdata_to_platdata,
.priv_auto_alloc_size = sizeof(struct sandbox_adc_priv),
};
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment